interpreter-irregexp.cc
isolate.cc
jsregexp.cc
- jump-target.cc
lithium-allocator.cc
lithium.cc
liveedit.cc
regexp-macro-assembler-irregexp.cc
regexp-macro-assembler.cc
regexp-stack.cc
- register-allocator.cc
rewriter.cc
runtime.cc
runtime-profiler.cc
v8threads.cc
variables.cc
version.cc
- virtual-frame.cc
zone.cc
extensions/gc-extension.cc
extensions/externalize-string-extension.cc
"""),
'arch:arm': Split("""
- jump-target-light.cc
- virtual-frame-light.cc
arm/builtins-arm.cc
arm/code-stubs-arm.cc
arm/codegen-arm.cc
arm/frames-arm.cc
arm/full-codegen-arm.cc
arm/ic-arm.cc
- arm/jump-target-arm.cc
arm/lithium-arm.cc
arm/lithium-codegen-arm.cc
arm/lithium-gap-resolver-arm.cc
arm/macro-assembler-arm.cc
arm/regexp-macro-assembler-arm.cc
- arm/register-allocator-arm.cc
arm/stub-cache-arm.cc
- arm/virtual-frame-arm.cc
arm/assembler-arm.cc
"""),
'arch:mips': Split("""
- jump-target-light.cc
- virtual-frame-light.cc
mips/assembler-mips.cc
mips/builtins-mips.cc
mips/code-stubs-mips.cc
mips/frames-mips.cc
mips/full-codegen-mips.cc
mips/ic-mips.cc
- mips/jump-target-mips.cc
mips/macro-assembler-mips.cc
mips/regexp-macro-assembler-mips.cc
- mips/register-allocator-mips.cc
mips/stub-cache-mips.cc
- mips/virtual-frame-mips.cc
"""),
'arch:ia32': Split("""
- jump-target-heavy.cc
- virtual-frame-heavy.cc
ia32/assembler-ia32.cc
ia32/builtins-ia32.cc
ia32/code-stubs-ia32.cc
ia32/frames-ia32.cc
ia32/full-codegen-ia32.cc
ia32/ic-ia32.cc
- ia32/jump-target-ia32.cc
ia32/lithium-codegen-ia32.cc
ia32/lithium-gap-resolver-ia32.cc
ia32/lithium-ia32.cc
ia32/macro-assembler-ia32.cc
ia32/regexp-macro-assembler-ia32.cc
- ia32/register-allocator-ia32.cc
ia32/stub-cache-ia32.cc
- ia32/virtual-frame-ia32.cc
"""),
'arch:x64': Split("""
- jump-target-heavy.cc
- virtual-frame-heavy.cc
x64/assembler-x64.cc
x64/builtins-x64.cc
x64/code-stubs-x64.cc
x64/frames-x64.cc
x64/full-codegen-x64.cc
x64/ic-x64.cc
- x64/jump-target-x64.cc
x64/lithium-codegen-x64.cc
x64/lithium-gap-resolver-x64.cc
x64/lithium-x64.cc
x64/macro-assembler-x64.cc
x64/regexp-macro-assembler-x64.cc
- x64/register-allocator-x64.cc
x64/stub-cache-x64.cc
- x64/virtual-frame-x64.cc
"""),
'simulator:arm': ['arm/simulator-arm.cc'],
'simulator:mips': ['mips/simulator-mips.cc'],
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_ARM)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
#include "deoptimizer.h"
#include "full-codegen.h"
}
+const char* GenericBinaryOpStub::GetName() {
+ if (name_ != NULL) return name_;
+ const int len = 100;
+ name_ = Isolate::Current()->bootstrapper()->AllocateAutoDeletedArray(len);
+ if (name_ == NULL) return "OOM";
+ const char* op_name = Token::Name(op_);
+ const char* overwrite_name;
+ switch (mode_) {
+ case NO_OVERWRITE: overwrite_name = "Alloc"; break;
+ case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break;
+ case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break;
+ default: overwrite_name = "UnknownOverwrite"; break;
+ }
+
+ OS::SNPrintF(Vector<char>(name_, len),
+ "GenericBinaryOpStub_%s_%s%s_%s",
+ op_name,
+ overwrite_name,
+ specialized_on_rhs_ ? "_ConstantRhs" : "",
+ BinaryOpIC::GetName(runtime_operands_type_));
+ return name_;
+}
+
+
// We fall into this code if the operands were Smis, but the result was
// not (eg. overflow). We branch into this code (to the not_smi label) if
// the operands were not both Smi. The operands are in r0 and r1. In order
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-#ifndef V8_ARM_CODEGEN_ARM_INL_H_
-#define V8_ARM_CODEGEN_ARM_INL_H_
-
-#include "virtual-frame-arm.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm_)
-
-// Platform-specific inline functions.
-
-void DeferredCode::Jump() { __ jmp(&entry_label_); }
-void DeferredCode::Branch(Condition cond) { __ b(cond, &entry_label_); }
-
-#undef __
-
-} } // namespace v8::internal
-
-#endif // V8_ARM_CODEGEN_ARM_INL_H_
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_ARM)
-#include "bootstrapper.h"
-#include "code-stubs.h"
-#include "codegen-inl.h"
-#include "compiler.h"
-#include "debug.h"
-#include "ic-inl.h"
-#include "jsregexp.h"
-#include "jump-target-inl.h"
-#include "parser.h"
-#include "regexp-macro-assembler.h"
-#include "regexp-stack.h"
-#include "register-allocator-inl.h"
-#include "runtime.h"
-#include "scopes.h"
-#include "stub-cache.h"
-#include "virtual-frame-inl.h"
-#include "virtual-frame-arm-inl.h"
+#include "codegen.h"
namespace v8 {
namespace internal {
-
-#define __ ACCESS_MASM(masm_)
-
-// -------------------------------------------------------------------------
-// Platform-specific DeferredCode functions.
-
-void DeferredCode::SaveRegisters() {
- // On ARM you either have a completely spilled frame or you
- // handle it yourself, but at the moment there's no automation
- // of registers and deferred code.
-}
-
-
-void DeferredCode::RestoreRegisters() {
-}
-
-
// -------------------------------------------------------------------------
// Platform-specific RuntimeCallHelper functions.
-void VirtualFrameRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
- frame_state_->frame()->AssertIsSpilled();
-}
-
-
-void VirtualFrameRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
-}
-
-
void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
masm->EnterInternalFrame();
}
}
-// -------------------------------------------------------------------------
-// CodeGenState implementation.
-
-CodeGenState::CodeGenState(CodeGenerator* owner)
- : owner_(owner),
- previous_(owner->state()) {
- owner->set_state(this);
-}
-
-
-ConditionCodeGenState::ConditionCodeGenState(CodeGenerator* owner,
- JumpTarget* true_target,
- JumpTarget* false_target)
- : CodeGenState(owner),
- true_target_(true_target),
- false_target_(false_target) {
- owner->set_state(this);
-}
-
-
-TypeInfoCodeGenState::TypeInfoCodeGenState(CodeGenerator* owner,
- Slot* slot,
- TypeInfo type_info)
- : CodeGenState(owner),
- slot_(slot) {
- owner->set_state(this);
- old_type_info_ = owner->set_type_info(slot, type_info);
-}
-
-
-CodeGenState::~CodeGenState() {
- ASSERT(owner_->state() == this);
- owner_->set_state(previous_);
-}
-
-
-TypeInfoCodeGenState::~TypeInfoCodeGenState() {
- owner()->set_type_info(slot_, old_type_info_);
-}
-
-// -------------------------------------------------------------------------
-// CodeGenerator implementation
-
-CodeGenerator::CodeGenerator(MacroAssembler* masm)
- : deferred_(8),
- masm_(masm),
- info_(NULL),
- frame_(NULL),
- allocator_(NULL),
- cc_reg_(al),
- state_(NULL),
- loop_nesting_(0),
- type_info_(NULL),
- function_return_(JumpTarget::BIDIRECTIONAL),
- function_return_is_shadowed_(false) {
-}
-
-
-// Calling conventions:
-// fp: caller's frame pointer
-// sp: stack pointer
-// r1: called JS function
-// cp: callee's context
-
-void CodeGenerator::Generate(CompilationInfo* info) {
- // Record the position for debugging purposes.
- CodeForFunctionPosition(info->function());
- Comment cmnt(masm_, "[ function compiled by virtual frame code generator");
-
- // Initialize state.
- info_ = info;
-
- int slots = scope()->num_parameters() + scope()->num_stack_slots();
- ScopedVector<TypeInfo> type_info_array(slots);
- for (int i = 0; i < slots; i++) {
- type_info_array[i] = TypeInfo::Unknown();
- }
- type_info_ = &type_info_array;
-
- ASSERT(allocator_ == NULL);
- RegisterAllocator register_allocator(this);
- allocator_ = ®ister_allocator;
- ASSERT(frame_ == NULL);
- frame_ = new VirtualFrame();
- cc_reg_ = al;
-
- // Adjust for function-level loop nesting.
- ASSERT_EQ(0, loop_nesting_);
- loop_nesting_ = info->is_in_loop() ? 1 : 0;
-
- {
- CodeGenState state(this);
-
- // Entry:
- // Stack: receiver, arguments
- // lr: return address
- // fp: caller's frame pointer
- // sp: stack pointer
- // r1: called JS function
- // cp: callee's context
- allocator_->Initialize();
-
-#ifdef DEBUG
- if (strlen(FLAG_stop_at) > 0 &&
- info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
- frame_->SpillAll();
- __ stop("stop-at");
- }
-#endif
-
- frame_->Enter();
- // tos: code slot
-
- // Allocate space for locals and initialize them. This also checks
- // for stack overflow.
- frame_->AllocateStackSlots();
-
- frame_->AssertIsSpilled();
- int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
- if (heap_slots > 0) {
- // Allocate local context.
- // Get outer context and create a new context based on it.
- __ ldr(r0, frame_->Function());
- frame_->EmitPush(r0);
- if (heap_slots <= FastNewContextStub::kMaximumSlots) {
- FastNewContextStub stub(heap_slots);
- frame_->CallStub(&stub, 1);
- } else {
- frame_->CallRuntime(Runtime::kNewContext, 1);
- }
-
-#ifdef DEBUG
- JumpTarget verified_true;
- __ cmp(r0, cp);
- verified_true.Branch(eq);
- __ stop("NewContext: r0 is expected to be the same as cp");
- verified_true.Bind();
-#endif
- // Update context local.
- __ str(cp, frame_->Context());
- }
-
- // TODO(1241774): Improve this code:
- // 1) only needed if we have a context
- // 2) no need to recompute context ptr every single time
- // 3) don't copy parameter operand code from SlotOperand!
- {
- Comment cmnt2(masm_, "[ copy context parameters into .context");
- // Note that iteration order is relevant here! If we have the same
- // parameter twice (e.g., function (x, y, x)), and that parameter
- // needs to be copied into the context, it must be the last argument
- // passed to the parameter that needs to be copied. This is a rare
- // case so we don't check for it, instead we rely on the copying
- // order: such a parameter is copied repeatedly into the same
- // context location and thus the last value is what is seen inside
- // the function.
- frame_->AssertIsSpilled();
- for (int i = 0; i < scope()->num_parameters(); i++) {
- Variable* par = scope()->parameter(i);
- Slot* slot = par->AsSlot();
- if (slot != NULL && slot->type() == Slot::CONTEXT) {
- ASSERT(!scope()->is_global_scope()); // No params in global scope.
- __ ldr(r1, frame_->ParameterAt(i));
- // Loads r2 with context; used below in RecordWrite.
- __ str(r1, SlotOperand(slot, r2));
- // Load the offset into r3.
- int slot_offset =
- FixedArray::kHeaderSize + slot->index() * kPointerSize;
- __ RecordWrite(r2, Operand(slot_offset), r3, r1);
- }
- }
- }
-
- // Store the arguments object. This must happen after context
- // initialization because the arguments object may be stored in
- // the context.
- if (ArgumentsMode() != NO_ARGUMENTS_ALLOCATION) {
- StoreArgumentsObject(true);
- }
-
- // Initialize ThisFunction reference if present.
- if (scope()->is_function_scope() && scope()->function() != NULL) {
- frame_->EmitPushRoot(Heap::kTheHoleValueRootIndex);
- StoreToSlot(scope()->function()->AsSlot(), NOT_CONST_INIT);
- }
-
- // Initialize the function return target after the locals are set
- // up, because it needs the expected frame height from the frame.
- function_return_.SetExpectedHeight();
- function_return_is_shadowed_ = false;
-
- // Generate code to 'execute' declarations and initialize functions
- // (source elements). In case of an illegal redeclaration we need to
- // handle that instead of processing the declarations.
- if (scope()->HasIllegalRedeclaration()) {
- Comment cmnt(masm_, "[ illegal redeclarations");
- scope()->VisitIllegalRedeclaration(this);
- } else {
- Comment cmnt(masm_, "[ declarations");
- ProcessDeclarations(scope()->declarations());
- // Bail out if a stack-overflow exception occurred when processing
- // declarations.
- if (HasStackOverflow()) return;
- }
-
- if (FLAG_trace) {
- frame_->CallRuntime(Runtime::kTraceEnter, 0);
- // Ignore the return value.
- }
-
- // Compile the body of the function in a vanilla state. Don't
- // bother compiling all the code if the scope has an illegal
- // redeclaration.
- if (!scope()->HasIllegalRedeclaration()) {
- Comment cmnt(masm_, "[ function body");
-#ifdef DEBUG
- bool is_builtin = Isolate::Current()->bootstrapper()->IsActive();
- bool should_trace =
- is_builtin ? FLAG_trace_builtin_calls : FLAG_trace_calls;
- if (should_trace) {
- frame_->CallRuntime(Runtime::kDebugTrace, 0);
- // Ignore the return value.
- }
-#endif
- VisitStatements(info->function()->body());
- }
- }
-
- // Handle the return from the function.
- if (has_valid_frame()) {
- // If there is a valid frame, control flow can fall off the end of
- // the body. In that case there is an implicit return statement.
- ASSERT(!function_return_is_shadowed_);
- frame_->PrepareForReturn();
- __ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
- if (function_return_.is_bound()) {
- function_return_.Jump();
- } else {
- function_return_.Bind();
- GenerateReturnSequence();
- }
- } else if (function_return_.is_linked()) {
- // If the return target has dangling jumps to it, then we have not
- // yet generated the return sequence. This can happen when (a)
- // control does not flow off the end of the body so we did not
- // compile an artificial return statement just above, and (b) there
- // are return statements in the body but (c) they are all shadowed.
- function_return_.Bind();
- GenerateReturnSequence();
- }
-
- // Adjust for function-level loop nesting.
- ASSERT(loop_nesting_ == info->is_in_loop()? 1 : 0);
- loop_nesting_ = 0;
-
- // Code generation state must be reset.
- ASSERT(!has_cc());
- ASSERT(state_ == NULL);
- ASSERT(loop_nesting() == 0);
- ASSERT(!function_return_is_shadowed_);
- function_return_.Unuse();
- DeleteFrame();
-
- // Process any deferred code using the register allocator.
- if (!HasStackOverflow()) {
- ProcessDeferred();
- }
-
- allocator_ = NULL;
- type_info_ = NULL;
-}
-
-
-int CodeGenerator::NumberOfSlot(Slot* slot) {
- if (slot == NULL) return kInvalidSlotNumber;
- switch (slot->type()) {
- case Slot::PARAMETER:
- return slot->index();
- case Slot::LOCAL:
- return slot->index() + scope()->num_parameters();
- default:
- break;
- }
- return kInvalidSlotNumber;
-}
-
-
-MemOperand CodeGenerator::SlotOperand(Slot* slot, Register tmp) {
- // Currently, this assertion will fail if we try to assign to
- // a constant variable that is constant because it is read-only
- // (such as the variable referring to a named function expression).
- // We need to implement assignments to read-only variables.
- // Ideally, we should do this during AST generation (by converting
- // such assignments into expression statements); however, in general
- // we may not be able to make the decision until past AST generation,
- // that is when the entire program is known.
- ASSERT(slot != NULL);
- int index = slot->index();
- switch (slot->type()) {
- case Slot::PARAMETER:
- return frame_->ParameterAt(index);
-
- case Slot::LOCAL:
- return frame_->LocalAt(index);
-
- case Slot::CONTEXT: {
- // Follow the context chain if necessary.
- ASSERT(!tmp.is(cp)); // do not overwrite context register
- Register context = cp;
- int chain_length = scope()->ContextChainLength(slot->var()->scope());
- for (int i = 0; i < chain_length; i++) {
- // Load the closure.
- // (All contexts, even 'with' contexts, have a closure,
- // and it is the same for all contexts inside a function.
- // There is no need to go to the function context first.)
- __ ldr(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
- // Load the function context (which is the incoming, outer context).
- __ ldr(tmp, FieldMemOperand(tmp, JSFunction::kContextOffset));
- context = tmp;
- }
- // We may have a 'with' context now. Get the function context.
- // (In fact this mov may never be the needed, since the scope analysis
- // may not permit a direct context access in this case and thus we are
- // always at a function context. However it is safe to dereference be-
- // cause the function context of a function context is itself. Before
- // deleting this mov we should try to create a counter-example first,
- // though...)
- __ ldr(tmp, ContextOperand(context, Context::FCONTEXT_INDEX));
- return ContextOperand(tmp, index);
- }
-
- default:
- UNREACHABLE();
- return MemOperand(r0, 0);
- }
-}
-
-
-MemOperand CodeGenerator::ContextSlotOperandCheckExtensions(
- Slot* slot,
- Register tmp,
- Register tmp2,
- JumpTarget* slow) {
- ASSERT(slot->type() == Slot::CONTEXT);
- Register context = cp;
-
- for (Scope* s = scope(); s != slot->var()->scope(); s = s->outer_scope()) {
- if (s->num_heap_slots() > 0) {
- if (s->calls_eval()) {
- // Check that extension is NULL.
- __ ldr(tmp2, ContextOperand(context, Context::EXTENSION_INDEX));
- __ tst(tmp2, tmp2);
- slow->Branch(ne);
- }
- __ ldr(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
- __ ldr(tmp, FieldMemOperand(tmp, JSFunction::kContextOffset));
- context = tmp;
- }
- }
- // Check that last extension is NULL.
- __ ldr(tmp2, ContextOperand(context, Context::EXTENSION_INDEX));
- __ tst(tmp2, tmp2);
- slow->Branch(ne);
- __ ldr(tmp, ContextOperand(context, Context::FCONTEXT_INDEX));
- return ContextOperand(tmp, slot->index());
-}
-
-
-// Loads a value on TOS. If it is a boolean value, the result may have been
-// (partially) translated into branches, or it may have set the condition
-// code register. If force_cc is set, the value is forced to set the
-// condition code register and no value is pushed. If the condition code
-// register was set, has_cc() is true and cc_reg_ contains the condition to
-// test for 'true'.
-void CodeGenerator::LoadCondition(Expression* x,
- JumpTarget* true_target,
- JumpTarget* false_target,
- bool force_cc) {
- ASSERT(!has_cc());
- int original_height = frame_->height();
-
- { ConditionCodeGenState new_state(this, true_target, false_target);
- Visit(x);
-
- // If we hit a stack overflow, we may not have actually visited
- // the expression. In that case, we ensure that we have a
- // valid-looking frame state because we will continue to generate
- // code as we unwind the C++ stack.
- //
- // It's possible to have both a stack overflow and a valid frame
- // state (eg, a subexpression overflowed, visiting it returned
- // with a dummied frame state, and visiting this expression
- // returned with a normal-looking state).
- if (HasStackOverflow() &&
- has_valid_frame() &&
- !has_cc() &&
- frame_->height() == original_height) {
- true_target->Jump();
- }
- }
- if (force_cc && frame_ != NULL && !has_cc()) {
- // Convert the TOS value to a boolean in the condition code register.
- ToBoolean(true_target, false_target);
- }
- ASSERT(!force_cc || !has_valid_frame() || has_cc());
- ASSERT(!has_valid_frame() ||
- (has_cc() && frame_->height() == original_height) ||
- (!has_cc() && frame_->height() == original_height + 1));
-}
-
-
-void CodeGenerator::Load(Expression* expr) {
- // We generally assume that we are not in a spilled scope for most
- // of the code generator. A failure to ensure this caused issue 815
- // and this assert is designed to catch similar issues.
- frame_->AssertIsNotSpilled();
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- JumpTarget true_target;
- JumpTarget false_target;
- LoadCondition(expr, &true_target, &false_target, false);
-
- if (has_cc()) {
- // Convert cc_reg_ into a boolean value.
- JumpTarget loaded;
- JumpTarget materialize_true;
- materialize_true.Branch(cc_reg_);
- frame_->EmitPushRoot(Heap::kFalseValueRootIndex);
- loaded.Jump();
- materialize_true.Bind();
- frame_->EmitPushRoot(Heap::kTrueValueRootIndex);
- loaded.Bind();
- cc_reg_ = al;
- }
-
- if (true_target.is_linked() || false_target.is_linked()) {
- // We have at least one condition value that has been "translated"
- // into a branch, thus it needs to be loaded explicitly.
- JumpTarget loaded;
- if (frame_ != NULL) {
- loaded.Jump(); // Don't lose the current TOS.
- }
- bool both = true_target.is_linked() && false_target.is_linked();
- // Load "true" if necessary.
- if (true_target.is_linked()) {
- true_target.Bind();
- frame_->EmitPushRoot(Heap::kTrueValueRootIndex);
- }
- // If both "true" and "false" need to be loaded jump across the code for
- // "false".
- if (both) {
- loaded.Jump();
- }
- // Load "false" if necessary.
- if (false_target.is_linked()) {
- false_target.Bind();
- frame_->EmitPushRoot(Heap::kFalseValueRootIndex);
- }
- // A value is loaded on all paths reaching this point.
- loaded.Bind();
- }
- ASSERT(has_valid_frame());
- ASSERT(!has_cc());
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::LoadGlobal() {
- Register reg = frame_->GetTOSRegister();
- __ ldr(reg, GlobalObjectOperand());
- frame_->EmitPush(reg);
-}
-
-
-void CodeGenerator::LoadGlobalReceiver(Register scratch) {
- Register reg = frame_->GetTOSRegister();
- __ ldr(reg, ContextOperand(cp, Context::GLOBAL_INDEX));
- __ ldr(reg,
- FieldMemOperand(reg, GlobalObject::kGlobalReceiverOffset));
- frame_->EmitPush(reg);
-}
-
-
-ArgumentsAllocationMode CodeGenerator::ArgumentsMode() {
- if (scope()->arguments() == NULL) return NO_ARGUMENTS_ALLOCATION;
-
- // In strict mode there is no need for shadow arguments.
- ASSERT(scope()->arguments_shadow() != NULL || scope()->is_strict_mode());
- // We don't want to do lazy arguments allocation for functions that
- // have heap-allocated contexts, because it interfers with the
- // uninitialized const tracking in the context objects.
- return (scope()->num_heap_slots() > 0 || scope()->is_strict_mode())
- ? EAGER_ARGUMENTS_ALLOCATION
- : LAZY_ARGUMENTS_ALLOCATION;
-}
-
-
-void CodeGenerator::StoreArgumentsObject(bool initial) {
- ArgumentsAllocationMode mode = ArgumentsMode();
- ASSERT(mode != NO_ARGUMENTS_ALLOCATION);
-
- Comment cmnt(masm_, "[ store arguments object");
- if (mode == LAZY_ARGUMENTS_ALLOCATION && initial) {
- // When using lazy arguments allocation, we store the hole value
- // as a sentinel indicating that the arguments object hasn't been
- // allocated yet.
- frame_->EmitPushRoot(Heap::kArgumentsMarkerRootIndex);
- } else {
- frame_->SpillAll();
- ArgumentsAccessStub stub(is_strict_mode()
- ? ArgumentsAccessStub::NEW_STRICT
- : ArgumentsAccessStub::NEW_NON_STRICT);
- __ ldr(r2, frame_->Function());
- // The receiver is below the arguments, the return address, and the
- // frame pointer on the stack.
- const int kReceiverDisplacement = 2 + scope()->num_parameters();
- __ add(r1, fp, Operand(kReceiverDisplacement * kPointerSize));
- __ mov(r0, Operand(Smi::FromInt(scope()->num_parameters())));
- frame_->Adjust(3);
- __ Push(r2, r1, r0);
- frame_->CallStub(&stub, 3);
- frame_->EmitPush(r0);
- }
-
- Variable* arguments = scope()->arguments();
- Variable* shadow = scope()->arguments_shadow();
- ASSERT(arguments != NULL && arguments->AsSlot() != NULL);
- ASSERT((shadow != NULL && shadow->AsSlot() != NULL) ||
- scope()->is_strict_mode());
-
- JumpTarget done;
- if (mode == LAZY_ARGUMENTS_ALLOCATION && !initial) {
- // We have to skip storing into the arguments slot if it has
- // already been written to. This can happen if the a function
- // has a local variable named 'arguments'.
- LoadFromSlot(scope()->arguments()->AsSlot(), NOT_INSIDE_TYPEOF);
- Register arguments = frame_->PopToRegister();
- __ LoadRoot(ip, Heap::kArgumentsMarkerRootIndex);
- __ cmp(arguments, ip);
- done.Branch(ne);
- }
- StoreToSlot(arguments->AsSlot(), NOT_CONST_INIT);
- if (mode == LAZY_ARGUMENTS_ALLOCATION) done.Bind();
- if (shadow != NULL) {
- StoreToSlot(shadow->AsSlot(), NOT_CONST_INIT);
- }
-}
-
-
-void CodeGenerator::LoadTypeofExpression(Expression* expr) {
- // Special handling of identifiers as subexpressions of typeof.
- Variable* variable = expr->AsVariableProxy()->AsVariable();
- if (variable != NULL && !variable->is_this() && variable->is_global()) {
- // For a global variable we build the property reference
- // <global>.<variable> and perform a (regular non-contextual) property
- // load to make sure we do not get reference errors.
- Slot global(variable, Slot::CONTEXT, Context::GLOBAL_INDEX);
- Literal key(variable->name());
- Property property(&global, &key, RelocInfo::kNoPosition);
- Reference ref(this, &property);
- ref.GetValue();
- } else if (variable != NULL && variable->AsSlot() != NULL) {
- // For a variable that rewrites to a slot, we signal it is the immediate
- // subexpression of a typeof.
- LoadFromSlotCheckForArguments(variable->AsSlot(), INSIDE_TYPEOF);
- } else {
- // Anything else can be handled normally.
- Load(expr);
- }
-}
-
-
-Reference::Reference(CodeGenerator* cgen,
- Expression* expression,
- bool persist_after_get)
- : cgen_(cgen),
- expression_(expression),
- type_(ILLEGAL),
- persist_after_get_(persist_after_get) {
- // We generally assume that we are not in a spilled scope for most
- // of the code generator. A failure to ensure this caused issue 815
- // and this assert is designed to catch similar issues.
- cgen->frame()->AssertIsNotSpilled();
- cgen->LoadReference(this);
-}
-
-
-Reference::~Reference() {
- ASSERT(is_unloaded() || is_illegal());
-}
-
-
-void CodeGenerator::LoadReference(Reference* ref) {
- Comment cmnt(masm_, "[ LoadReference");
- Expression* e = ref->expression();
- Property* property = e->AsProperty();
- Variable* var = e->AsVariableProxy()->AsVariable();
-
- if (property != NULL) {
- // The expression is either a property or a variable proxy that rewrites
- // to a property.
- Load(property->obj());
- if (property->key()->IsPropertyName()) {
- ref->set_type(Reference::NAMED);
- } else {
- Load(property->key());
- ref->set_type(Reference::KEYED);
- }
- } else if (var != NULL) {
- // The expression is a variable proxy that does not rewrite to a
- // property. Global variables are treated as named property references.
- if (var->is_global()) {
- LoadGlobal();
- ref->set_type(Reference::NAMED);
- } else {
- ASSERT(var->AsSlot() != NULL);
- ref->set_type(Reference::SLOT);
- }
- } else {
- // Anything else is a runtime error.
- Load(e);
- frame_->CallRuntime(Runtime::kThrowReferenceError, 1);
- }
-}
-
-
-void CodeGenerator::UnloadReference(Reference* ref) {
- int size = ref->size();
- ref->set_unloaded();
- if (size == 0) return;
-
- // Pop a reference from the stack while preserving TOS.
- VirtualFrame::RegisterAllocationScope scope(this);
- Comment cmnt(masm_, "[ UnloadReference");
- if (size > 0) {
- Register tos = frame_->PopToRegister();
- frame_->Drop(size);
- frame_->EmitPush(tos);
- }
-}
-
-
-// ECMA-262, section 9.2, page 30: ToBoolean(). Convert the given
-// register to a boolean in the condition code register. The code
-// may jump to 'false_target' in case the register converts to 'false'.
-void CodeGenerator::ToBoolean(JumpTarget* true_target,
- JumpTarget* false_target) {
- // Note: The generated code snippet does not change stack variables.
- // Only the condition code should be set.
- bool known_smi = frame_->KnownSmiAt(0);
- Register tos = frame_->PopToRegister();
-
- // Fast case checks
-
- // Check if the value is 'false'.
- if (!known_smi) {
- __ LoadRoot(ip, Heap::kFalseValueRootIndex);
- __ cmp(tos, ip);
- false_target->Branch(eq);
-
- // Check if the value is 'true'.
- __ LoadRoot(ip, Heap::kTrueValueRootIndex);
- __ cmp(tos, ip);
- true_target->Branch(eq);
-
- // Check if the value is 'undefined'.
- __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
- __ cmp(tos, ip);
- false_target->Branch(eq);
- }
-
- // Check if the value is a smi.
- __ cmp(tos, Operand(Smi::FromInt(0)));
-
- if (!known_smi) {
- false_target->Branch(eq);
- __ tst(tos, Operand(kSmiTagMask));
- true_target->Branch(eq);
-
- // Slow case.
- if (CpuFeatures::IsSupported(VFP3)) {
- CpuFeatures::Scope scope(VFP3);
- // Implements the slow case by using ToBooleanStub.
- // The ToBooleanStub takes a single argument, and
- // returns a non-zero value for true, or zero for false.
- // Both the argument value and the return value use the
- // register assigned to tos_
- ToBooleanStub stub(tos);
- frame_->CallStub(&stub, 0);
- // Convert the result in "tos" to a condition code.
- __ cmp(tos, Operand(0, RelocInfo::NONE));
- } else {
- // Implements slow case by calling the runtime.
- frame_->EmitPush(tos);
- frame_->CallRuntime(Runtime::kToBool, 1);
- // Convert the result (r0) to a condition code.
- __ LoadRoot(ip, Heap::kFalseValueRootIndex);
- __ cmp(r0, ip);
- }
- }
-
- cc_reg_ = ne;
-}
-
-
-void CodeGenerator::GenericBinaryOperation(Token::Value op,
- OverwriteMode overwrite_mode,
- GenerateInlineSmi inline_smi,
- int constant_rhs) {
- // top of virtual frame: y
- // 2nd elt. on virtual frame : x
- // result : top of virtual frame
-
- // Stub is entered with a call: 'return address' is in lr.
- switch (op) {
- case Token::ADD:
- case Token::SUB:
- if (inline_smi) {
- JumpTarget done;
- Register rhs = frame_->PopToRegister();
- Register lhs = frame_->PopToRegister(rhs);
- Register scratch = VirtualFrame::scratch0();
- __ orr(scratch, rhs, Operand(lhs));
- // Check they are both small and positive.
- __ tst(scratch, Operand(kSmiTagMask | 0xc0000000));
- ASSERT(rhs.is(r0) || lhs.is(r0)); // r0 is free now.
- STATIC_ASSERT(kSmiTag == 0);
- if (op == Token::ADD) {
- __ add(r0, lhs, Operand(rhs), LeaveCC, eq);
- } else {
- __ sub(r0, lhs, Operand(rhs), LeaveCC, eq);
- }
- done.Branch(eq);
- GenericBinaryOpStub stub(op, overwrite_mode, lhs, rhs, constant_rhs);
- frame_->SpillAll();
- frame_->CallStub(&stub, 0);
- done.Bind();
- frame_->EmitPush(r0);
- break;
- } else {
- // Fall through!
- }
- case Token::BIT_OR:
- case Token::BIT_AND:
- case Token::BIT_XOR:
- if (inline_smi) {
- bool rhs_is_smi = frame_->KnownSmiAt(0);
- bool lhs_is_smi = frame_->KnownSmiAt(1);
- Register rhs = frame_->PopToRegister();
- Register lhs = frame_->PopToRegister(rhs);
- Register smi_test_reg;
- Condition cond;
- if (!rhs_is_smi || !lhs_is_smi) {
- if (rhs_is_smi) {
- smi_test_reg = lhs;
- } else if (lhs_is_smi) {
- smi_test_reg = rhs;
- } else {
- smi_test_reg = VirtualFrame::scratch0();
- __ orr(smi_test_reg, rhs, Operand(lhs));
- }
- // Check they are both Smis.
- __ tst(smi_test_reg, Operand(kSmiTagMask));
- cond = eq;
- } else {
- cond = al;
- }
- ASSERT(rhs.is(r0) || lhs.is(r0)); // r0 is free now.
- if (op == Token::BIT_OR) {
- __ orr(r0, lhs, Operand(rhs), LeaveCC, cond);
- } else if (op == Token::BIT_AND) {
- __ and_(r0, lhs, Operand(rhs), LeaveCC, cond);
- } else {
- ASSERT(op == Token::BIT_XOR);
- STATIC_ASSERT(kSmiTag == 0);
- __ eor(r0, lhs, Operand(rhs), LeaveCC, cond);
- }
- if (cond != al) {
- JumpTarget done;
- done.Branch(cond);
- GenericBinaryOpStub stub(op, overwrite_mode, lhs, rhs, constant_rhs);
- frame_->SpillAll();
- frame_->CallStub(&stub, 0);
- done.Bind();
- }
- frame_->EmitPush(r0);
- break;
- } else {
- // Fall through!
- }
- case Token::MUL:
- case Token::DIV:
- case Token::MOD:
- case Token::SHL:
- case Token::SHR:
- case Token::SAR: {
- Register rhs = frame_->PopToRegister();
- Register lhs = frame_->PopToRegister(rhs); // Don't pop to rhs register.
- GenericBinaryOpStub stub(op, overwrite_mode, lhs, rhs, constant_rhs);
- frame_->SpillAll();
- frame_->CallStub(&stub, 0);
- frame_->EmitPush(r0);
- break;
- }
-
- case Token::COMMA: {
- Register scratch = frame_->PopToRegister();
- // Simply discard left value.
- frame_->Drop();
- frame_->EmitPush(scratch);
- break;
- }
-
- default:
- // Other cases should have been handled before this point.
- UNREACHABLE();
- break;
- }
-}
-
-
-class DeferredInlineSmiOperation: public DeferredCode {
- public:
- DeferredInlineSmiOperation(Token::Value op,
- int value,
- bool reversed,
- OverwriteMode overwrite_mode,
- Register tos)
- : op_(op),
- value_(value),
- reversed_(reversed),
- overwrite_mode_(overwrite_mode),
- tos_register_(tos) {
- set_comment("[ DeferredInlinedSmiOperation");
- }
-
- virtual void Generate();
- // This stub makes explicit calls to SaveRegisters(), RestoreRegisters() and
- // Exit(). Currently on ARM SaveRegisters() and RestoreRegisters() are empty
- // methods, it is the responsibility of the deferred code to save and restore
- // registers.
- virtual bool AutoSaveAndRestore() { return false; }
-
- void JumpToNonSmiInput(Condition cond);
- void JumpToAnswerOutOfRange(Condition cond);
-
- private:
- void GenerateNonSmiInput();
- void GenerateAnswerOutOfRange();
- void WriteNonSmiAnswer(Register answer,
- Register heap_number,
- Register scratch);
-
- Token::Value op_;
- int value_;
- bool reversed_;
- OverwriteMode overwrite_mode_;
- Register tos_register_;
- Label non_smi_input_;
- Label answer_out_of_range_;
-};
-
-
-// For bit operations we try harder and handle the case where the input is not
-// a Smi but a 32bits integer without calling the generic stub.
-void DeferredInlineSmiOperation::JumpToNonSmiInput(Condition cond) {
- ASSERT(Token::IsBitOp(op_));
-
- __ b(cond, &non_smi_input_);
-}
-
-
-// For bit operations the result is always 32bits so we handle the case where
-// the result does not fit in a Smi without calling the generic stub.
-void DeferredInlineSmiOperation::JumpToAnswerOutOfRange(Condition cond) {
- ASSERT(Token::IsBitOp(op_));
-
- if ((op_ == Token::SHR) && !CpuFeatures::IsSupported(VFP3)) {
- // >>> requires an unsigned to double conversion and the non VFP code
- // does not support this conversion.
- __ b(cond, entry_label());
- } else {
- __ b(cond, &answer_out_of_range_);
- }
-}
-
-
-// On entry the non-constant side of the binary operation is in tos_register_
-// and the constant smi side is nowhere. The tos_register_ is not used by the
-// virtual frame. On exit the answer is in the tos_register_ and the virtual
-// frame is unchanged.
-void DeferredInlineSmiOperation::Generate() {
- VirtualFrame copied_frame(*frame_state()->frame());
- copied_frame.SpillAll();
-
- Register lhs = r1;
- Register rhs = r0;
- switch (op_) {
- case Token::ADD: {
- // Revert optimistic add.
- if (reversed_) {
- __ sub(r0, tos_register_, Operand(Smi::FromInt(value_)));
- __ mov(r1, Operand(Smi::FromInt(value_)));
- } else {
- __ sub(r1, tos_register_, Operand(Smi::FromInt(value_)));
- __ mov(r0, Operand(Smi::FromInt(value_)));
- }
- break;
- }
-
- case Token::SUB: {
- // Revert optimistic sub.
- if (reversed_) {
- __ rsb(r0, tos_register_, Operand(Smi::FromInt(value_)));
- __ mov(r1, Operand(Smi::FromInt(value_)));
- } else {
- __ add(r1, tos_register_, Operand(Smi::FromInt(value_)));
- __ mov(r0, Operand(Smi::FromInt(value_)));
- }
- break;
- }
-
- // For these operations there is no optimistic operation that needs to be
- // reverted.
- case Token::MUL:
- case Token::MOD:
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND:
- case Token::SHL:
- case Token::SHR:
- case Token::SAR: {
- if (tos_register_.is(r1)) {
- __ mov(r0, Operand(Smi::FromInt(value_)));
- } else {
- ASSERT(tos_register_.is(r0));
- __ mov(r1, Operand(Smi::FromInt(value_)));
- }
- if (reversed_ == tos_register_.is(r1)) {
- lhs = r0;
- rhs = r1;
- }
- break;
- }
-
- default:
- // Other cases should have been handled before this point.
- UNREACHABLE();
- break;
- }
-
- GenericBinaryOpStub stub(op_, overwrite_mode_, lhs, rhs, value_);
- __ CallStub(&stub);
-
- // The generic stub returns its value in r0, but that's not
- // necessarily what we want. We want whatever the inlined code
- // expected, which is that the answer is in the same register as
- // the operand was.
- __ Move(tos_register_, r0);
-
- // The tos register was not in use for the virtual frame that we
- // came into this function with, so we can merge back to that frame
- // without trashing it.
- copied_frame.MergeTo(frame_state()->frame());
-
- Exit();
-
- if (non_smi_input_.is_linked()) {
- GenerateNonSmiInput();
- }
-
- if (answer_out_of_range_.is_linked()) {
- GenerateAnswerOutOfRange();
- }
-}
-
-
-// Convert and write the integer answer into heap_number.
-void DeferredInlineSmiOperation::WriteNonSmiAnswer(Register answer,
- Register heap_number,
- Register scratch) {
- if (CpuFeatures::IsSupported(VFP3)) {
- CpuFeatures::Scope scope(VFP3);
- __ vmov(s0, answer);
- if (op_ == Token::SHR) {
- __ vcvt_f64_u32(d0, s0);
- } else {
- __ vcvt_f64_s32(d0, s0);
- }
- __ sub(scratch, heap_number, Operand(kHeapObjectTag));
- __ vstr(d0, scratch, HeapNumber::kValueOffset);
- } else {
- WriteInt32ToHeapNumberStub stub(answer, heap_number, scratch);
- __ CallStub(&stub);
- }
-}
-
-
-void DeferredInlineSmiOperation::GenerateNonSmiInput() {
- // We know the left hand side is not a Smi and the right hand side is an
- // immediate value (value_) which can be represented as a Smi. We only
- // handle bit operations.
- ASSERT(Token::IsBitOp(op_));
-
- if (FLAG_debug_code) {
- __ Abort("Should not fall through!");
- }
-
- __ bind(&non_smi_input_);
- if (FLAG_debug_code) {
- __ AbortIfSmi(tos_register_);
- }
-
- // This routine uses the registers from r2 to r6. At the moment they are
- // not used by the register allocator, but when they are it should use
- // SpillAll and MergeTo like DeferredInlineSmiOperation::Generate() above.
-
- Register heap_number_map = r7;
- __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
- __ ldr(r3, FieldMemOperand(tos_register_, HeapNumber::kMapOffset));
- __ cmp(r3, heap_number_map);
- // Not a number, fall back to the GenericBinaryOpStub.
- __ b(ne, entry_label());
-
- Register int32 = r2;
- // Not a 32bits signed int, fall back to the GenericBinaryOpStub.
- __ ConvertToInt32(tos_register_, int32, r4, r5, d0, entry_label());
-
- // tos_register_ (r0 or r1): Original heap number.
- // int32: signed 32bits int.
-
- Label result_not_a_smi;
- int shift_value = value_ & 0x1f;
- switch (op_) {
- case Token::BIT_OR: __ orr(int32, int32, Operand(value_)); break;
- case Token::BIT_XOR: __ eor(int32, int32, Operand(value_)); break;
- case Token::BIT_AND: __ and_(int32, int32, Operand(value_)); break;
- case Token::SAR:
- ASSERT(!reversed_);
- if (shift_value != 0) {
- __ mov(int32, Operand(int32, ASR, shift_value));
- }
- break;
- case Token::SHR:
- ASSERT(!reversed_);
- if (shift_value != 0) {
- __ mov(int32, Operand(int32, LSR, shift_value), SetCC);
- } else {
- // SHR is special because it is required to produce a positive answer.
- __ cmp(int32, Operand(0, RelocInfo::NONE));
- }
- if (CpuFeatures::IsSupported(VFP3)) {
- __ b(mi, &result_not_a_smi);
- } else {
- // Non VFP code cannot convert from unsigned to double, so fall back
- // to GenericBinaryOpStub.
- __ b(mi, entry_label());
- }
- break;
- case Token::SHL:
- ASSERT(!reversed_);
- if (shift_value != 0) {
- __ mov(int32, Operand(int32, LSL, shift_value));
- }
- break;
- default: UNREACHABLE();
- }
- // Check that the *signed* result fits in a smi. Not necessary for AND, SAR
- // if the shift if more than 0 or SHR if the shit is more than 1.
- if (!( (op_ == Token::AND && value_ >= 0) ||
- ((op_ == Token::SAR) && (shift_value > 0)) ||
- ((op_ == Token::SHR) && (shift_value > 1)))) {
- __ add(r3, int32, Operand(0x40000000), SetCC);
- __ b(mi, &result_not_a_smi);
- }
- __ mov(tos_register_, Operand(int32, LSL, kSmiTagSize));
- Exit();
-
- if (result_not_a_smi.is_linked()) {
- __ bind(&result_not_a_smi);
- if (overwrite_mode_ != OVERWRITE_LEFT) {
- ASSERT((overwrite_mode_ == NO_OVERWRITE) ||
- (overwrite_mode_ == OVERWRITE_RIGHT));
- // If the allocation fails, fall back to the GenericBinaryOpStub.
- __ AllocateHeapNumber(r4, r5, r6, heap_number_map, entry_label());
- // Nothing can go wrong now, so overwrite tos.
- __ mov(tos_register_, Operand(r4));
- }
-
- // int32: answer as signed 32bits integer.
- // tos_register_: Heap number to write the answer into.
- WriteNonSmiAnswer(int32, tos_register_, r3);
-
- Exit();
- }
-}
-
-
-void DeferredInlineSmiOperation::GenerateAnswerOutOfRange() {
- // The input from a bitwise operation were Smis but the result cannot fit
- // into a Smi, so we store it into a heap number. VirtualFrame::scratch0()
- // holds the untagged result to be converted. tos_register_ contains the
- // input. See the calls to JumpToAnswerOutOfRange to see how we got here.
- ASSERT(Token::IsBitOp(op_));
- ASSERT(!reversed_);
-
- Register untagged_result = VirtualFrame::scratch0();
-
- if (FLAG_debug_code) {
- __ Abort("Should not fall through!");
- }
-
- __ bind(&answer_out_of_range_);
- if (((value_ & 0x1f) == 0) && (op_ == Token::SHR)) {
- // >>> 0 is a special case where the untagged_result register is not set up
- // yet. We untag the input to get it.
- __ mov(untagged_result, Operand(tos_register_, ASR, kSmiTagSize));
- }
-
- // This routine uses the registers from r2 to r6. At the moment they are
- // not used by the register allocator, but when they are it should use
- // SpillAll and MergeTo like DeferredInlineSmiOperation::Generate() above.
-
- // Allocate the result heap number.
- Register heap_number_map = VirtualFrame::scratch1();
- Register heap_number = r4;
- __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
- // If the allocation fails, fall back to the GenericBinaryOpStub.
- __ AllocateHeapNumber(heap_number, r5, r6, heap_number_map, entry_label());
- WriteNonSmiAnswer(untagged_result, heap_number, r3);
- __ mov(tos_register_, Operand(heap_number));
-
- Exit();
-}
-
-
-static bool PopCountLessThanEqual2(unsigned int x) {
- x &= x - 1;
- return (x & (x - 1)) == 0;
-}
-
-
-// Returns the index of the lowest bit set.
-static int BitPosition(unsigned x) {
- int bit_posn = 0;
- while ((x & 0xf) == 0) {
- bit_posn += 4;
- x >>= 4;
- }
- while ((x & 1) == 0) {
- bit_posn++;
- x >>= 1;
- }
- return bit_posn;
-}
-
-
-// Can we multiply by x with max two shifts and an add.
-// This answers yes to all integers from 2 to 10.
-static bool IsEasyToMultiplyBy(int x) {
- if (x < 2) return false; // Avoid special cases.
- if (x > (Smi::kMaxValue + 1) >> 2) return false; // Almost always overflows.
- if (IsPowerOf2(x)) return true; // Simple shift.
- if (PopCountLessThanEqual2(x)) return true; // Shift and add and shift.
- if (IsPowerOf2(x + 1)) return true; // Patterns like 11111.
- return false;
-}
-
-
-// Can multiply by anything that IsEasyToMultiplyBy returns true for.
-// Source and destination may be the same register. This routine does
-// not set carry and overflow the way a mul instruction would.
-static void InlineMultiplyByKnownInt(MacroAssembler* masm,
- Register source,
- Register destination,
- int known_int) {
- if (IsPowerOf2(known_int)) {
- masm->mov(destination, Operand(source, LSL, BitPosition(known_int)));
- } else if (PopCountLessThanEqual2(known_int)) {
- int first_bit = BitPosition(known_int);
- int second_bit = BitPosition(known_int ^ (1 << first_bit));
- masm->add(destination, source,
- Operand(source, LSL, second_bit - first_bit));
- if (first_bit != 0) {
- masm->mov(destination, Operand(destination, LSL, first_bit));
- }
- } else {
- ASSERT(IsPowerOf2(known_int + 1)); // Patterns like 1111.
- int the_bit = BitPosition(known_int + 1);
- masm->rsb(destination, source, Operand(source, LSL, the_bit));
- }
-}
-
-
-void CodeGenerator::SmiOperation(Token::Value op,
- Handle<Object> value,
- bool reversed,
- OverwriteMode mode) {
- int int_value = Smi::cast(*value)->value();
-
- bool both_sides_are_smi = frame_->KnownSmiAt(0);
-
- bool something_to_inline;
- switch (op) {
- case Token::ADD:
- case Token::SUB:
- case Token::BIT_AND:
- case Token::BIT_OR:
- case Token::BIT_XOR: {
- something_to_inline = true;
- break;
- }
- case Token::SHL: {
- something_to_inline = (both_sides_are_smi || !reversed);
- break;
- }
- case Token::SHR:
- case Token::SAR: {
- if (reversed) {
- something_to_inline = false;
- } else {
- something_to_inline = true;
- }
- break;
- }
- case Token::MOD: {
- if (reversed || int_value < 2 || !IsPowerOf2(int_value)) {
- something_to_inline = false;
- } else {
- something_to_inline = true;
- }
- break;
- }
- case Token::MUL: {
- if (!IsEasyToMultiplyBy(int_value)) {
- something_to_inline = false;
- } else {
- something_to_inline = true;
- }
- break;
- }
- default: {
- something_to_inline = false;
- break;
- }
- }
-
- if (!something_to_inline) {
- if (!reversed) {
- // Push the rhs onto the virtual frame by putting it in a TOS register.
- Register rhs = frame_->GetTOSRegister();
- __ mov(rhs, Operand(value));
- frame_->EmitPush(rhs, TypeInfo::Smi());
- GenericBinaryOperation(op, mode, GENERATE_INLINE_SMI, int_value);
- } else {
- // Pop the rhs, then push lhs and rhs in the right order. Only performs
- // at most one pop, the rest takes place in TOS registers.
- Register lhs = frame_->GetTOSRegister(); // Get reg for pushing.
- Register rhs = frame_->PopToRegister(lhs); // Don't use lhs for this.
- __ mov(lhs, Operand(value));
- frame_->EmitPush(lhs, TypeInfo::Smi());
- TypeInfo t = both_sides_are_smi ? TypeInfo::Smi() : TypeInfo::Unknown();
- frame_->EmitPush(rhs, t);
- GenericBinaryOperation(op, mode, GENERATE_INLINE_SMI,
- GenericBinaryOpStub::kUnknownIntValue);
- }
- return;
- }
-
- // We move the top of stack to a register (normally no move is invoved).
- Register tos = frame_->PopToRegister();
- switch (op) {
- case Token::ADD: {
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op, int_value, reversed, mode, tos);
-
- __ add(tos, tos, Operand(value), SetCC);
- deferred->Branch(vs);
- if (!both_sides_are_smi) {
- __ tst(tos, Operand(kSmiTagMask));
- deferred->Branch(ne);
- }
- deferred->BindExit();
- frame_->EmitPush(tos);
- break;
- }
-
- case Token::SUB: {
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op, int_value, reversed, mode, tos);
-
- if (reversed) {
- __ rsb(tos, tos, Operand(value), SetCC);
- } else {
- __ sub(tos, tos, Operand(value), SetCC);
- }
- deferred->Branch(vs);
- if (!both_sides_are_smi) {
- __ tst(tos, Operand(kSmiTagMask));
- deferred->Branch(ne);
- }
- deferred->BindExit();
- frame_->EmitPush(tos);
- break;
- }
-
-
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND: {
- if (both_sides_are_smi) {
- switch (op) {
- case Token::BIT_OR: __ orr(tos, tos, Operand(value)); break;
- case Token::BIT_XOR: __ eor(tos, tos, Operand(value)); break;
- case Token::BIT_AND: __ And(tos, tos, Operand(value)); break;
- default: UNREACHABLE();
- }
- frame_->EmitPush(tos, TypeInfo::Smi());
- } else {
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op, int_value, reversed, mode, tos);
- __ tst(tos, Operand(kSmiTagMask));
- deferred->JumpToNonSmiInput(ne);
- switch (op) {
- case Token::BIT_OR: __ orr(tos, tos, Operand(value)); break;
- case Token::BIT_XOR: __ eor(tos, tos, Operand(value)); break;
- case Token::BIT_AND: __ And(tos, tos, Operand(value)); break;
- default: UNREACHABLE();
- }
- deferred->BindExit();
- TypeInfo result_type = TypeInfo::Integer32();
- if (op == Token::BIT_AND && int_value >= 0) {
- result_type = TypeInfo::Smi();
- }
- frame_->EmitPush(tos, result_type);
- }
- break;
- }
-
- case Token::SHL:
- if (reversed) {
- ASSERT(both_sides_are_smi);
- int max_shift = 0;
- int max_result = int_value == 0 ? 1 : int_value;
- while (Smi::IsValid(max_result << 1)) {
- max_shift++;
- max_result <<= 1;
- }
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op, int_value, true, mode, tos);
- // Mask off the last 5 bits of the shift operand (rhs). This is part
- // of the definition of shift in JS and we know we have a Smi so we
- // can safely do this. The masked version gets passed to the
- // deferred code, but that makes no difference.
- __ and_(tos, tos, Operand(Smi::FromInt(0x1f)));
- __ cmp(tos, Operand(Smi::FromInt(max_shift)));
- deferred->Branch(ge);
- Register scratch = VirtualFrame::scratch0();
- __ mov(scratch, Operand(tos, ASR, kSmiTagSize)); // Untag.
- __ mov(tos, Operand(Smi::FromInt(int_value))); // Load constant.
- __ mov(tos, Operand(tos, LSL, scratch)); // Shift constant.
- deferred->BindExit();
- TypeInfo result = TypeInfo::Integer32();
- frame_->EmitPush(tos, result);
- break;
- }
- // Fall through!
- case Token::SHR:
- case Token::SAR: {
- ASSERT(!reversed);
- int shift_value = int_value & 0x1f;
- TypeInfo result = TypeInfo::Number();
-
- if (op == Token::SHR) {
- if (shift_value > 1) {
- result = TypeInfo::Smi();
- } else if (shift_value > 0) {
- result = TypeInfo::Integer32();
- }
- } else if (op == Token::SAR) {
- if (shift_value > 0) {
- result = TypeInfo::Smi();
- } else {
- result = TypeInfo::Integer32();
- }
- } else {
- ASSERT(op == Token::SHL);
- result = TypeInfo::Integer32();
- }
-
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op, shift_value, false, mode, tos);
- if (!both_sides_are_smi) {
- __ tst(tos, Operand(kSmiTagMask));
- deferred->JumpToNonSmiInput(ne);
- }
- switch (op) {
- case Token::SHL: {
- if (shift_value != 0) {
- Register untagged_result = VirtualFrame::scratch0();
- Register scratch = VirtualFrame::scratch1();
- int adjusted_shift = shift_value - kSmiTagSize;
- ASSERT(adjusted_shift >= 0);
-
- if (adjusted_shift != 0) {
- __ mov(untagged_result, Operand(tos, LSL, adjusted_shift));
- } else {
- __ mov(untagged_result, Operand(tos));
- }
- // Check that the *signed* result fits in a smi.
- __ add(scratch, untagged_result, Operand(0x40000000), SetCC);
- deferred->JumpToAnswerOutOfRange(mi);
- __ mov(tos, Operand(untagged_result, LSL, kSmiTagSize));
- }
- break;
- }
- case Token::SHR: {
- if (shift_value != 0) {
- Register untagged_result = VirtualFrame::scratch0();
- // Remove tag.
- __ mov(untagged_result, Operand(tos, ASR, kSmiTagSize));
- __ mov(untagged_result, Operand(untagged_result, LSR, shift_value));
- if (shift_value == 1) {
- // Check that the *unsigned* result fits in a smi.
- // Neither of the two high-order bits can be set:
- // - 0x80000000: high bit would be lost when smi tagging
- // - 0x40000000: this number would convert to negative when Smi
- // tagging.
- // These two cases can only happen with shifts by 0 or 1 when
- // handed a valid smi.
- __ tst(untagged_result, Operand(0xc0000000));
- deferred->JumpToAnswerOutOfRange(ne);
- }
- __ mov(tos, Operand(untagged_result, LSL, kSmiTagSize));
- } else {
- __ cmp(tos, Operand(0, RelocInfo::NONE));
- deferred->JumpToAnswerOutOfRange(mi);
- }
- break;
- }
- case Token::SAR: {
- if (shift_value != 0) {
- // Do the shift and the tag removal in one operation. If the shift
- // is 31 bits (the highest possible value) then we emit the
- // instruction as a shift by 0 which in the ARM ISA means shift
- // arithmetically by 32.
- __ mov(tos, Operand(tos, ASR, (kSmiTagSize + shift_value) & 0x1f));
- __ mov(tos, Operand(tos, LSL, kSmiTagSize));
- }
- break;
- }
- default: UNREACHABLE();
- }
- deferred->BindExit();
- frame_->EmitPush(tos, result);
- break;
- }
-
- case Token::MOD: {
- ASSERT(!reversed);
- ASSERT(int_value >= 2);
- ASSERT(IsPowerOf2(int_value));
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op, int_value, reversed, mode, tos);
- unsigned mask = (0x80000000u | kSmiTagMask);
- __ tst(tos, Operand(mask));
- deferred->Branch(ne); // Go to deferred code on non-Smis and negative.
- mask = (int_value << kSmiTagSize) - 1;
- __ and_(tos, tos, Operand(mask));
- deferred->BindExit();
- // Mod of positive power of 2 Smi gives a Smi if the lhs is an integer.
- frame_->EmitPush(
- tos,
- both_sides_are_smi ? TypeInfo::Smi() : TypeInfo::Number());
- break;
- }
-
- case Token::MUL: {
- ASSERT(IsEasyToMultiplyBy(int_value));
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op, int_value, reversed, mode, tos);
- unsigned max_smi_that_wont_overflow = Smi::kMaxValue / int_value;
- max_smi_that_wont_overflow <<= kSmiTagSize;
- unsigned mask = 0x80000000u;
- while ((mask & max_smi_that_wont_overflow) == 0) {
- mask |= mask >> 1;
- }
- mask |= kSmiTagMask;
- // This does a single mask that checks for a too high value in a
- // conservative way and for a non-Smi. It also filters out negative
- // numbers, unfortunately, but since this code is inline we prefer
- // brevity to comprehensiveness.
- __ tst(tos, Operand(mask));
- deferred->Branch(ne);
- InlineMultiplyByKnownInt(masm_, tos, tos, int_value);
- deferred->BindExit();
- frame_->EmitPush(tos);
- break;
- }
-
- default:
- UNREACHABLE();
- break;
- }
-}
-
-
-void CodeGenerator::Comparison(Condition cond,
- Expression* left,
- Expression* right,
- bool strict) {
- VirtualFrame::RegisterAllocationScope scope(this);
-
- if (left != NULL) Load(left);
- if (right != NULL) Load(right);
-
- // sp[0] : y
- // sp[1] : x
- // result : cc register
-
- // Strict only makes sense for equality comparisons.
- ASSERT(!strict || cond == eq);
-
- Register lhs;
- Register rhs;
-
- bool lhs_is_smi;
- bool rhs_is_smi;
-
- // We load the top two stack positions into registers chosen by the virtual
- // frame. This should keep the register shuffling to a minimum.
- // Implement '>' and '<=' by reversal to obtain ECMA-262 conversion order.
- if (cond == gt || cond == le) {
- cond = ReverseCondition(cond);
- lhs_is_smi = frame_->KnownSmiAt(0);
- rhs_is_smi = frame_->KnownSmiAt(1);
- lhs = frame_->PopToRegister();
- rhs = frame_->PopToRegister(lhs); // Don't pop to the same register again!
- } else {
- rhs_is_smi = frame_->KnownSmiAt(0);
- lhs_is_smi = frame_->KnownSmiAt(1);
- rhs = frame_->PopToRegister();
- lhs = frame_->PopToRegister(rhs); // Don't pop to the same register again!
- }
-
- bool both_sides_are_smi = (lhs_is_smi && rhs_is_smi);
-
- ASSERT(rhs.is(r0) || rhs.is(r1));
- ASSERT(lhs.is(r0) || lhs.is(r1));
-
- JumpTarget exit;
-
- if (!both_sides_are_smi) {
- // Now we have the two sides in r0 and r1. We flush any other registers
- // because the stub doesn't know about register allocation.
- frame_->SpillAll();
- Register scratch = VirtualFrame::scratch0();
- Register smi_test_reg;
- if (lhs_is_smi) {
- smi_test_reg = rhs;
- } else if (rhs_is_smi) {
- smi_test_reg = lhs;
- } else {
- __ orr(scratch, lhs, Operand(rhs));
- smi_test_reg = scratch;
- }
- __ tst(smi_test_reg, Operand(kSmiTagMask));
- JumpTarget smi;
- smi.Branch(eq);
-
- // Perform non-smi comparison by stub.
- // CompareStub takes arguments in r0 and r1, returns <0, >0 or 0 in r0.
- // We call with 0 args because there are 0 on the stack.
- CompareStub stub(cond, strict, NO_SMI_COMPARE_IN_STUB, lhs, rhs);
- frame_->CallStub(&stub, 0);
- __ cmp(r0, Operand(0, RelocInfo::NONE));
- exit.Jump();
-
- smi.Bind();
- }
-
- // Do smi comparisons by pointer comparison.
- __ cmp(lhs, Operand(rhs));
-
- exit.Bind();
- cc_reg_ = cond;
-}
-
-
-// Call the function on the stack with the given arguments.
-void CodeGenerator::CallWithArguments(ZoneList<Expression*>* args,
- CallFunctionFlags flags,
- int position) {
- // Push the arguments ("left-to-right") on the stack.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- // Record the position for debugging purposes.
- CodeForSourcePosition(position);
-
- // Use the shared code stub to call the function.
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- CallFunctionStub call_function(arg_count, in_loop, flags);
- frame_->CallStub(&call_function, arg_count + 1);
-
- // Restore context and pop function from the stack.
- __ ldr(cp, frame_->Context());
- frame_->Drop(); // discard the TOS
-}
-
-
-void CodeGenerator::CallApplyLazy(Expression* applicand,
- Expression* receiver,
- VariableProxy* arguments,
- int position) {
- // An optimized implementation of expressions of the form
- // x.apply(y, arguments).
- // If the arguments object of the scope has not been allocated,
- // and x.apply is Function.prototype.apply, this optimization
- // just copies y and the arguments of the current function on the
- // stack, as receiver and arguments, and calls x.
- // In the implementation comments, we call x the applicand
- // and y the receiver.
-
- ASSERT(ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION);
- ASSERT(arguments->IsArguments());
-
- // Load applicand.apply onto the stack. This will usually
- // give us a megamorphic load site. Not super, but it works.
- Load(applicand);
- Handle<String> name = FACTORY->LookupAsciiSymbol("apply");
- frame_->Dup();
- frame_->CallLoadIC(name, RelocInfo::CODE_TARGET);
- frame_->EmitPush(r0);
-
- // Load the receiver and the existing arguments object onto the
- // expression stack. Avoid allocating the arguments object here.
- Load(receiver);
- LoadFromSlot(scope()->arguments()->AsSlot(), NOT_INSIDE_TYPEOF);
-
- // At this point the top two stack elements are probably in registers
- // since they were just loaded. Ensure they are in regs and get the
- // regs.
- Register receiver_reg = frame_->Peek2();
- Register arguments_reg = frame_->Peek();
-
- // From now on the frame is spilled.
- frame_->SpillAll();
-
- // Emit the source position information after having loaded the
- // receiver and the arguments.
- CodeForSourcePosition(position);
- // Contents of the stack at this point:
- // sp[0]: arguments object of the current function or the hole.
- // sp[1]: receiver
- // sp[2]: applicand.apply
- // sp[3]: applicand.
-
- // Check if the arguments object has been lazily allocated
- // already. If so, just use that instead of copying the arguments
- // from the stack. This also deals with cases where a local variable
- // named 'arguments' has been introduced.
- JumpTarget slow;
- Label done;
- __ LoadRoot(ip, Heap::kArgumentsMarkerRootIndex);
- __ cmp(ip, arguments_reg);
- slow.Branch(ne);
-
- Label build_args;
- // Get rid of the arguments object probe.
- frame_->Drop();
- // Stack now has 3 elements on it.
- // Contents of stack at this point:
- // sp[0]: receiver - in the receiver_reg register.
- // sp[1]: applicand.apply
- // sp[2]: applicand.
-
- // Check that the receiver really is a JavaScript object.
- __ JumpIfSmi(receiver_reg, &build_args);
- // We allow all JSObjects including JSFunctions. As long as
- // JS_FUNCTION_TYPE is the last instance type and it is right
- // after LAST_JS_OBJECT_TYPE, we do not have to check the upper
- // bound.
- STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
- STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
- __ CompareObjectType(receiver_reg, r2, r3, FIRST_JS_OBJECT_TYPE);
- __ b(lt, &build_args);
-
- // Check that applicand.apply is Function.prototype.apply.
- __ ldr(r0, MemOperand(sp, kPointerSize));
- __ JumpIfSmi(r0, &build_args);
- __ CompareObjectType(r0, r1, r2, JS_FUNCTION_TYPE);
- __ b(ne, &build_args);
- Handle<Code> apply_code(
- Isolate::Current()->builtins()->builtin(Builtins::kFunctionApply));
- __ ldr(r1, FieldMemOperand(r0, JSFunction::kCodeEntryOffset));
- __ sub(r1, r1, Operand(Code::kHeaderSize - kHeapObjectTag));
- __ cmp(r1, Operand(apply_code));
- __ b(ne, &build_args);
-
- // Check that applicand is a function.
- __ ldr(r1, MemOperand(sp, 2 * kPointerSize));
- __ JumpIfSmi(r1, &build_args);
- __ CompareObjectType(r1, r2, r3, JS_FUNCTION_TYPE);
- __ b(ne, &build_args);
-
- // Copy the arguments to this function possibly from the
- // adaptor frame below it.
- Label invoke, adapted;
- __ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
- __ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
- __ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
- __ b(eq, &adapted);
-
- // No arguments adaptor frame. Copy fixed number of arguments.
- __ mov(r0, Operand(scope()->num_parameters()));
- for (int i = 0; i < scope()->num_parameters(); i++) {
- __ ldr(r2, frame_->ParameterAt(i));
- __ push(r2);
- }
- __ jmp(&invoke);
-
- // Arguments adaptor frame present. Copy arguments from there, but
- // avoid copying too many arguments to avoid stack overflows.
- __ bind(&adapted);
- static const uint32_t kArgumentsLimit = 1 * KB;
- __ ldr(r0, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
- __ mov(r0, Operand(r0, LSR, kSmiTagSize));
- __ mov(r3, r0);
- __ cmp(r0, Operand(kArgumentsLimit));
- __ b(gt, &build_args);
-
- // Loop through the arguments pushing them onto the execution
- // stack. We don't inform the virtual frame of the push, so we don't
- // have to worry about getting rid of the elements from the virtual
- // frame.
- Label loop;
- // r3 is a small non-negative integer, due to the test above.
- __ cmp(r3, Operand(0, RelocInfo::NONE));
- __ b(eq, &invoke);
- // Compute the address of the first argument.
- __ add(r2, r2, Operand(r3, LSL, kPointerSizeLog2));
- __ add(r2, r2, Operand(kPointerSize));
- __ bind(&loop);
- // Post-decrement argument address by kPointerSize on each iteration.
- __ ldr(r4, MemOperand(r2, kPointerSize, NegPostIndex));
- __ push(r4);
- __ sub(r3, r3, Operand(1), SetCC);
- __ b(gt, &loop);
-
- // Invoke the function.
- __ bind(&invoke);
- ParameterCount actual(r0);
- __ InvokeFunction(r1, actual, CALL_FUNCTION);
- // Drop applicand.apply and applicand from the stack, and push
- // the result of the function call, but leave the spilled frame
- // unchanged, with 3 elements, so it is correct when we compile the
- // slow-case code.
- __ add(sp, sp, Operand(2 * kPointerSize));
- __ push(r0);
- // Stack now has 1 element:
- // sp[0]: result
- __ jmp(&done);
-
- // Slow-case: Allocate the arguments object since we know it isn't
- // there, and fall-through to the slow-case where we call
- // applicand.apply.
- __ bind(&build_args);
- // Stack now has 3 elements, because we have jumped from where:
- // sp[0]: receiver
- // sp[1]: applicand.apply
- // sp[2]: applicand.
- StoreArgumentsObject(false);
-
- // Stack and frame now have 4 elements.
- slow.Bind();
-
- // Generic computation of x.apply(y, args) with no special optimization.
- // Flip applicand.apply and applicand on the stack, so
- // applicand looks like the receiver of the applicand.apply call.
- // Then process it as a normal function call.
- __ ldr(r0, MemOperand(sp, 3 * kPointerSize));
- __ ldr(r1, MemOperand(sp, 2 * kPointerSize));
- __ Strd(r0, r1, MemOperand(sp, 2 * kPointerSize));
-
- CallFunctionStub call_function(2, NOT_IN_LOOP, NO_CALL_FUNCTION_FLAGS);
- frame_->CallStub(&call_function, 3);
- // The function and its two arguments have been dropped.
- frame_->Drop(); // Drop the receiver as well.
- frame_->EmitPush(r0);
- frame_->SpillAll(); // A spilled frame is also jumping to label done.
- // Stack now has 1 element:
- // sp[0]: result
- __ bind(&done);
-
- // Restore the context register after a call.
- __ ldr(cp, frame_->Context());
-}
-
-
-void CodeGenerator::Branch(bool if_true, JumpTarget* target) {
- ASSERT(has_cc());
- Condition cond = if_true ? cc_reg_ : NegateCondition(cc_reg_);
- target->Branch(cond);
- cc_reg_ = al;
-}
-
-
-void CodeGenerator::CheckStack() {
- frame_->SpillAll();
- Comment cmnt(masm_, "[ check stack");
- __ LoadRoot(ip, Heap::kStackLimitRootIndex);
- masm_->cmp(sp, Operand(ip));
- StackCheckStub stub;
- // Call the stub if lower.
- masm_->mov(ip,
- Operand(reinterpret_cast<intptr_t>(stub.GetCode().location()),
- RelocInfo::CODE_TARGET),
- LeaveCC,
- lo);
- masm_->Call(ip, lo);
-}
-
-
-void CodeGenerator::VisitStatements(ZoneList<Statement*>* statements) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- for (int i = 0; frame_ != NULL && i < statements->length(); i++) {
- Visit(statements->at(i));
- }
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitBlock(Block* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Block");
- CodeForStatementPosition(node);
- node->break_target()->SetExpectedHeight();
- VisitStatements(node->statements());
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- node->break_target()->Unuse();
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(pairs));
- frame_->EmitPush(Operand(Smi::FromInt(is_eval() ? 1 : 0)));
- frame_->EmitPush(Operand(Smi::FromInt(strict_mode_flag())));
-
- frame_->CallRuntime(Runtime::kDeclareGlobals, 4);
- // The result is discarded.
-}
-
-
-void CodeGenerator::VisitDeclaration(Declaration* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Declaration");
- Variable* var = node->proxy()->var();
- ASSERT(var != NULL); // must have been resolved
- Slot* slot = var->AsSlot();
-
- // If it was not possible to allocate the variable at compile time,
- // we need to "declare" it at runtime to make sure it actually
- // exists in the local context.
- if (slot != NULL && slot->type() == Slot::LOOKUP) {
- // Variables with a "LOOKUP" slot were introduced as non-locals
- // during variable resolution and must have mode DYNAMIC.
- ASSERT(var->is_dynamic());
- // For now, just do a runtime call.
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(var->name()));
- // Declaration nodes are always declared in only two modes.
- ASSERT(node->mode() == Variable::VAR || node->mode() == Variable::CONST);
- PropertyAttributes attr = node->mode() == Variable::VAR ? NONE : READ_ONLY;
- frame_->EmitPush(Operand(Smi::FromInt(attr)));
- // Push initial value, if any.
- // Note: For variables we must not push an initial value (such as
- // 'undefined') because we may have a (legal) redeclaration and we
- // must not destroy the current value.
- if (node->mode() == Variable::CONST) {
- frame_->EmitPushRoot(Heap::kTheHoleValueRootIndex);
- } else if (node->fun() != NULL) {
- Load(node->fun());
- } else {
- frame_->EmitPush(Operand(0, RelocInfo::NONE));
- }
-
- frame_->CallRuntime(Runtime::kDeclareContextSlot, 4);
- // Ignore the return value (declarations are statements).
-
- ASSERT(frame_->height() == original_height);
- return;
- }
-
- ASSERT(!var->is_global());
-
- // If we have a function or a constant, we need to initialize the variable.
- Expression* val = NULL;
- if (node->mode() == Variable::CONST) {
- val = new Literal(FACTORY->the_hole_value());
- } else {
- val = node->fun(); // NULL if we don't have a function
- }
-
-
- if (val != NULL) {
- WriteBarrierCharacter wb_info =
- val->type()->IsLikelySmi() ? LIKELY_SMI : UNLIKELY_SMI;
- if (val->AsLiteral() != NULL) wb_info = NEVER_NEWSPACE;
- // Set initial value.
- Reference target(this, node->proxy());
- Load(val);
- target.SetValue(NOT_CONST_INIT, wb_info);
-
- // Get rid of the assigned value (declarations are statements).
- frame_->Drop();
- }
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitExpressionStatement(ExpressionStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ ExpressionStatement");
- CodeForStatementPosition(node);
- Expression* expression = node->expression();
- expression->MarkAsStatement();
- Load(expression);
- frame_->Drop();
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitEmptyStatement(EmptyStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "// EmptyStatement");
- CodeForStatementPosition(node);
- // nothing to do
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitIfStatement(IfStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ IfStatement");
- // Generate different code depending on which parts of the if statement
- // are present or not.
- bool has_then_stm = node->HasThenStatement();
- bool has_else_stm = node->HasElseStatement();
-
- CodeForStatementPosition(node);
-
- JumpTarget exit;
- if (has_then_stm && has_else_stm) {
- Comment cmnt(masm_, "[ IfThenElse");
- JumpTarget then;
- JumpTarget else_;
- // if (cond)
- LoadCondition(node->condition(), &then, &else_, true);
- if (frame_ != NULL) {
- Branch(false, &else_);
- }
- // then
- if (frame_ != NULL || then.is_linked()) {
- then.Bind();
- Visit(node->then_statement());
- }
- if (frame_ != NULL) {
- exit.Jump();
- }
- // else
- if (else_.is_linked()) {
- else_.Bind();
- Visit(node->else_statement());
- }
-
- } else if (has_then_stm) {
- Comment cmnt(masm_, "[ IfThen");
- ASSERT(!has_else_stm);
- JumpTarget then;
- // if (cond)
- LoadCondition(node->condition(), &then, &exit, true);
- if (frame_ != NULL) {
- Branch(false, &exit);
- }
- // then
- if (frame_ != NULL || then.is_linked()) {
- then.Bind();
- Visit(node->then_statement());
- }
-
- } else if (has_else_stm) {
- Comment cmnt(masm_, "[ IfElse");
- ASSERT(!has_then_stm);
- JumpTarget else_;
- // if (!cond)
- LoadCondition(node->condition(), &exit, &else_, true);
- if (frame_ != NULL) {
- Branch(true, &exit);
- }
- // else
- if (frame_ != NULL || else_.is_linked()) {
- else_.Bind();
- Visit(node->else_statement());
- }
-
- } else {
- Comment cmnt(masm_, "[ If");
- ASSERT(!has_then_stm && !has_else_stm);
- // if (cond)
- LoadCondition(node->condition(), &exit, &exit, false);
- if (frame_ != NULL) {
- if (has_cc()) {
- cc_reg_ = al;
- } else {
- frame_->Drop();
- }
- }
- }
-
- // end
- if (exit.is_linked()) {
- exit.Bind();
- }
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitContinueStatement(ContinueStatement* node) {
- Comment cmnt(masm_, "[ ContinueStatement");
- CodeForStatementPosition(node);
- node->target()->continue_target()->Jump();
-}
-
-
-void CodeGenerator::VisitBreakStatement(BreakStatement* node) {
- Comment cmnt(masm_, "[ BreakStatement");
- CodeForStatementPosition(node);
- node->target()->break_target()->Jump();
-}
-
-
-void CodeGenerator::VisitReturnStatement(ReturnStatement* node) {
- Comment cmnt(masm_, "[ ReturnStatement");
-
- CodeForStatementPosition(node);
- Load(node->expression());
- frame_->PopToR0();
- frame_->PrepareForReturn();
- if (function_return_is_shadowed_) {
- function_return_.Jump();
- } else {
- // Pop the result from the frame and prepare the frame for
- // returning thus making it easier to merge.
- if (function_return_.is_bound()) {
- // If the function return label is already bound we reuse the
- // code by jumping to the return site.
- function_return_.Jump();
- } else {
- function_return_.Bind();
- GenerateReturnSequence();
- }
- }
-}
-
-
-void CodeGenerator::GenerateReturnSequence() {
- if (FLAG_trace) {
- // Push the return value on the stack as the parameter.
- // Runtime::TraceExit returns the parameter as it is.
- frame_->EmitPush(r0);
- frame_->CallRuntime(Runtime::kTraceExit, 1);
- }
-
-#ifdef DEBUG
- // Add a label for checking the size of the code used for returning.
- Label check_exit_codesize;
- masm_->bind(&check_exit_codesize);
-#endif
- // Make sure that the constant pool is not emitted inside of the return
- // sequence.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- // Tear down the frame which will restore the caller's frame pointer and
- // the link register.
- frame_->Exit();
-
- // Here we use masm_-> instead of the __ macro to avoid the code coverage
- // tool from instrumenting as we rely on the code size here.
- int32_t sp_delta = (scope()->num_parameters() + 1) * kPointerSize;
- masm_->add(sp, sp, Operand(sp_delta));
- masm_->Jump(lr);
- DeleteFrame();
-
-#ifdef DEBUG
- // Check that the size of the code used for returning is large enough
- // for the debugger's requirements.
- ASSERT(Assembler::kJSReturnSequenceInstructions <=
- masm_->InstructionsGeneratedSince(&check_exit_codesize));
-#endif
- }
-}
-
-
-void CodeGenerator::VisitWithEnterStatement(WithEnterStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ WithEnterStatement");
- CodeForStatementPosition(node);
- Load(node->expression());
- if (node->is_catch_block()) {
- frame_->CallRuntime(Runtime::kPushCatchContext, 1);
- } else {
- frame_->CallRuntime(Runtime::kPushContext, 1);
- }
-#ifdef DEBUG
- JumpTarget verified_true;
- __ cmp(r0, cp);
- verified_true.Branch(eq);
- __ stop("PushContext: r0 is expected to be the same as cp");
- verified_true.Bind();
-#endif
- // Update context local.
- __ str(cp, frame_->Context());
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitWithExitStatement(WithExitStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ WithExitStatement");
- CodeForStatementPosition(node);
- // Pop context.
- __ ldr(cp, ContextOperand(cp, Context::PREVIOUS_INDEX));
- // Update context local.
- __ str(cp, frame_->Context());
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitSwitchStatement(SwitchStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ SwitchStatement");
- CodeForStatementPosition(node);
- node->break_target()->SetExpectedHeight();
-
- Load(node->tag());
-
- JumpTarget next_test;
- JumpTarget fall_through;
- JumpTarget default_entry;
- JumpTarget default_exit(JumpTarget::BIDIRECTIONAL);
- ZoneList<CaseClause*>* cases = node->cases();
- int length = cases->length();
- CaseClause* default_clause = NULL;
-
- for (int i = 0; i < length; i++) {
- CaseClause* clause = cases->at(i);
- if (clause->is_default()) {
- // Remember the default clause and compile it at the end.
- default_clause = clause;
- continue;
- }
-
- Comment cmnt(masm_, "[ Case clause");
- // Compile the test.
- next_test.Bind();
- next_test.Unuse();
- // Duplicate TOS.
- frame_->Dup();
- Comparison(eq, NULL, clause->label(), true);
- Branch(false, &next_test);
-
- // Before entering the body from the test, remove the switch value from
- // the stack.
- frame_->Drop();
-
- // Label the body so that fall through is enabled.
- if (i > 0 && cases->at(i - 1)->is_default()) {
- default_exit.Bind();
- } else {
- fall_through.Bind();
- fall_through.Unuse();
- }
- VisitStatements(clause->statements());
-
- // If control flow can fall through from the body, jump to the next body
- // or the end of the statement.
- if (frame_ != NULL) {
- if (i < length - 1 && cases->at(i + 1)->is_default()) {
- default_entry.Jump();
- } else {
- fall_through.Jump();
- }
- }
- }
-
- // The final "test" removes the switch value.
- next_test.Bind();
- frame_->Drop();
-
- // If there is a default clause, compile it.
- if (default_clause != NULL) {
- Comment cmnt(masm_, "[ Default clause");
- default_entry.Bind();
- VisitStatements(default_clause->statements());
- // If control flow can fall out of the default and there is a case after
- // it, jump to that case's body.
- if (frame_ != NULL && default_exit.is_bound()) {
- default_exit.Jump();
- }
- }
-
- if (fall_through.is_linked()) {
- fall_through.Bind();
- }
-
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- node->break_target()->Unuse();
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitDoWhileStatement(DoWhileStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ DoWhileStatement");
- CodeForStatementPosition(node);
- node->break_target()->SetExpectedHeight();
- JumpTarget body(JumpTarget::BIDIRECTIONAL);
- IncrementLoopNesting();
-
- // Label the top of the loop for the backward CFG edge. If the test
- // is always true we can use the continue target, and if the test is
- // always false there is no need.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- switch (info) {
- case ALWAYS_TRUE:
- node->continue_target()->SetExpectedHeight();
- node->continue_target()->Bind();
- break;
- case ALWAYS_FALSE:
- node->continue_target()->SetExpectedHeight();
- break;
- case DONT_KNOW:
- node->continue_target()->SetExpectedHeight();
- body.Bind();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- // Compile the test.
- switch (info) {
- case ALWAYS_TRUE:
- // If control can fall off the end of the body, jump back to the
- // top.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- break;
- case ALWAYS_FALSE:
- // If we have a continue in the body, we only have to bind its
- // jump target.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- break;
- case DONT_KNOW:
- // We have to compile the test expression if it can be reached by
- // control flow falling out of the body or via continue.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (has_valid_frame()) {
- Comment cmnt(masm_, "[ DoWhileCondition");
- CodeForDoWhileConditionPosition(node);
- LoadCondition(node->cond(), &body, node->break_target(), true);
- if (has_valid_frame()) {
- // A invalid frame here indicates that control did not
- // fall out of the test expression.
- Branch(true, &body);
- }
- }
- break;
- }
-
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitWhileStatement(WhileStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ WhileStatement");
- CodeForStatementPosition(node);
-
- // If the test is never true and has no side effects there is no need
- // to compile the test or body.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- if (info == ALWAYS_FALSE) return;
-
- node->break_target()->SetExpectedHeight();
- IncrementLoopNesting();
-
- // Label the top of the loop with the continue target for the backward
- // CFG edge.
- node->continue_target()->SetExpectedHeight();
- node->continue_target()->Bind();
-
- if (info == DONT_KNOW) {
- JumpTarget body(JumpTarget::BIDIRECTIONAL);
- LoadCondition(node->cond(), &body, node->break_target(), true);
- if (has_valid_frame()) {
- // A NULL frame indicates that control did not fall out of the
- // test expression.
- Branch(false, node->break_target());
- }
- if (has_valid_frame() || body.is_linked()) {
- body.Bind();
- }
- }
-
- if (has_valid_frame()) {
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- // If control flow can fall out of the body, jump back to the top.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitForStatement(ForStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ ForStatement");
- CodeForStatementPosition(node);
- if (node->init() != NULL) {
- Visit(node->init());
- }
-
- // If the test is never true there is no need to compile the test or
- // body.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- if (info == ALWAYS_FALSE) return;
-
- node->break_target()->SetExpectedHeight();
- IncrementLoopNesting();
-
- // We know that the loop index is a smi if it is not modified in the
- // loop body and it is checked against a constant limit in the loop
- // condition. In this case, we reset the static type information of the
- // loop index to smi before compiling the body, the update expression, and
- // the bottom check of the loop condition.
- TypeInfoCodeGenState type_info_scope(this,
- node->is_fast_smi_loop() ?
- node->loop_variable()->AsSlot() :
- NULL,
- TypeInfo::Smi());
-
- // If there is no update statement, label the top of the loop with the
- // continue target, otherwise with the loop target.
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
- if (node->next() == NULL) {
- node->continue_target()->SetExpectedHeight();
- node->continue_target()->Bind();
- } else {
- node->continue_target()->SetExpectedHeight();
- loop.Bind();
- }
-
- // If the test is always true, there is no need to compile it.
- if (info == DONT_KNOW) {
- JumpTarget body;
- LoadCondition(node->cond(), &body, node->break_target(), true);
- if (has_valid_frame()) {
- Branch(false, node->break_target());
- }
- if (has_valid_frame() || body.is_linked()) {
- body.Bind();
- }
- }
-
- if (has_valid_frame()) {
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- if (node->next() == NULL) {
- // If there is no update statement and control flow can fall out
- // of the loop, jump directly to the continue label.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- } else {
- // If there is an update statement and control flow can reach it
- // via falling out of the body of the loop or continuing, we
- // compile the update statement.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (has_valid_frame()) {
- // Record source position of the statement as this code which is
- // after the code for the body actually belongs to the loop
- // statement and not the body.
- CodeForStatementPosition(node);
- Visit(node->next());
- loop.Jump();
- }
- }
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitForInStatement(ForInStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ ForInStatement");
- CodeForStatementPosition(node);
-
- JumpTarget primitive;
- JumpTarget jsobject;
- JumpTarget fixed_array;
- JumpTarget entry(JumpTarget::BIDIRECTIONAL);
- JumpTarget end_del_check;
- JumpTarget exit;
-
- // Get the object to enumerate over (converted to JSObject).
- Load(node->enumerable());
-
- VirtualFrame::SpilledScope spilled_scope(frame_);
- // Both SpiderMonkey and kjs ignore null and undefined in contrast
- // to the specification. 12.6.4 mandates a call to ToObject.
- frame_->EmitPop(r0);
- __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
- __ cmp(r0, ip);
- exit.Branch(eq);
- __ LoadRoot(ip, Heap::kNullValueRootIndex);
- __ cmp(r0, ip);
- exit.Branch(eq);
-
- // Stack layout in body:
- // [iteration counter (Smi)]
- // [length of array]
- // [FixedArray]
- // [Map or 0]
- // [Object]
-
- // Check if enumerable is already a JSObject
- __ tst(r0, Operand(kSmiTagMask));
- primitive.Branch(eq);
- __ CompareObjectType(r0, r1, r1, FIRST_JS_OBJECT_TYPE);
- jsobject.Branch(hs);
-
- primitive.Bind();
- frame_->EmitPush(r0);
- frame_->InvokeBuiltin(Builtins::TO_OBJECT, CALL_JS, 1);
-
- jsobject.Bind();
- // Get the set of properties (as a FixedArray or Map).
- // r0: value to be iterated over
- frame_->EmitPush(r0); // Push the object being iterated over.
-
- // Check cache validity in generated code. This is a fast case for
- // the JSObject::IsSimpleEnum cache validity checks. If we cannot
- // guarantee cache validity, call the runtime system to check cache
- // validity or get the property names in a fixed array.
- JumpTarget call_runtime;
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
- JumpTarget check_prototype;
- JumpTarget use_cache;
- __ mov(r1, Operand(r0));
- loop.Bind();
- // Check that there are no elements.
- __ ldr(r2, FieldMemOperand(r1, JSObject::kElementsOffset));
- __ LoadRoot(r4, Heap::kEmptyFixedArrayRootIndex);
- __ cmp(r2, r4);
- call_runtime.Branch(ne);
- // Check that instance descriptors are not empty so that we can
- // check for an enum cache. Leave the map in r3 for the subsequent
- // prototype load.
- __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset));
- __ ldr(r2, FieldMemOperand(r3, Map::kInstanceDescriptorsOffset));
- __ LoadRoot(ip, Heap::kEmptyDescriptorArrayRootIndex);
- __ cmp(r2, ip);
- call_runtime.Branch(eq);
- // Check that there in an enum cache in the non-empty instance
- // descriptors. This is the case if the next enumeration index
- // field does not contain a smi.
- __ ldr(r2, FieldMemOperand(r2, DescriptorArray::kEnumerationIndexOffset));
- __ tst(r2, Operand(kSmiTagMask));
- call_runtime.Branch(eq);
- // For all objects but the receiver, check that the cache is empty.
- // r4: empty fixed array root.
- __ cmp(r1, r0);
- check_prototype.Branch(eq);
- __ ldr(r2, FieldMemOperand(r2, DescriptorArray::kEnumCacheBridgeCacheOffset));
- __ cmp(r2, r4);
- call_runtime.Branch(ne);
- check_prototype.Bind();
- // Load the prototype from the map and loop if non-null.
- __ ldr(r1, FieldMemOperand(r3, Map::kPrototypeOffset));
- __ LoadRoot(ip, Heap::kNullValueRootIndex);
- __ cmp(r1, ip);
- loop.Branch(ne);
- // The enum cache is valid. Load the map of the object being
- // iterated over and use the cache for the iteration.
- __ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));
- use_cache.Jump();
-
- call_runtime.Bind();
- // Call the runtime to get the property names for the object.
- frame_->EmitPush(r0); // push the object (slot 4) for the runtime call
- frame_->CallRuntime(Runtime::kGetPropertyNamesFast, 1);
-
- // If we got a map from the runtime call, we can do a fast
- // modification check. Otherwise, we got a fixed array, and we have
- // to do a slow check.
- // r0: map or fixed array (result from call to
- // Runtime::kGetPropertyNamesFast)
- __ mov(r2, Operand(r0));
- __ ldr(r1, FieldMemOperand(r2, HeapObject::kMapOffset));
- __ LoadRoot(ip, Heap::kMetaMapRootIndex);
- __ cmp(r1, ip);
- fixed_array.Branch(ne);
-
- use_cache.Bind();
- // Get enum cache
- // r0: map (either the result from a call to
- // Runtime::kGetPropertyNamesFast or has been fetched directly from
- // the object)
- __ mov(r1, Operand(r0));
- __ ldr(r1, FieldMemOperand(r1, Map::kInstanceDescriptorsOffset));
- __ ldr(r1, FieldMemOperand(r1, DescriptorArray::kEnumerationIndexOffset));
- __ ldr(r2,
- FieldMemOperand(r1, DescriptorArray::kEnumCacheBridgeCacheOffset));
-
- frame_->EmitPush(r0); // map
- frame_->EmitPush(r2); // enum cache bridge cache
- __ ldr(r0, FieldMemOperand(r2, FixedArray::kLengthOffset));
- frame_->EmitPush(r0);
- __ mov(r0, Operand(Smi::FromInt(0)));
- frame_->EmitPush(r0);
- entry.Jump();
-
- fixed_array.Bind();
- __ mov(r1, Operand(Smi::FromInt(0)));
- frame_->EmitPush(r1); // insert 0 in place of Map
- frame_->EmitPush(r0);
-
- // Push the length of the array and the initial index onto the stack.
- __ ldr(r0, FieldMemOperand(r0, FixedArray::kLengthOffset));
- frame_->EmitPush(r0);
- __ mov(r0, Operand(Smi::FromInt(0))); // init index
- frame_->EmitPush(r0);
-
- // Condition.
- entry.Bind();
- // sp[0] : index
- // sp[1] : array/enum cache length
- // sp[2] : array or enum cache
- // sp[3] : 0 or map
- // sp[4] : enumerable
- // Grab the current frame's height for the break and continue
- // targets only after all the state is pushed on the frame.
- node->break_target()->SetExpectedHeight();
- node->continue_target()->SetExpectedHeight();
-
- // Load the current count to r0, load the length to r1.
- __ Ldrd(r0, r1, frame_->ElementAt(0));
- __ cmp(r0, r1); // compare to the array length
- node->break_target()->Branch(hs);
-
- // Get the i'th entry of the array.
- __ ldr(r2, frame_->ElementAt(2));
- __ add(r2, r2, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
- __ ldr(r3, MemOperand(r2, r0, LSL, kPointerSizeLog2 - kSmiTagSize));
-
- // Get Map or 0.
- __ ldr(r2, frame_->ElementAt(3));
- // Check if this (still) matches the map of the enumerable.
- // If not, we have to filter the key.
- __ ldr(r1, frame_->ElementAt(4));
- __ ldr(r1, FieldMemOperand(r1, HeapObject::kMapOffset));
- __ cmp(r1, Operand(r2));
- end_del_check.Branch(eq);
-
- // Convert the entry to a string (or null if it isn't a property anymore).
- __ ldr(r0, frame_->ElementAt(4)); // push enumerable
- frame_->EmitPush(r0);
- frame_->EmitPush(r3); // push entry
- frame_->InvokeBuiltin(Builtins::FILTER_KEY, CALL_JS, 2);
- __ mov(r3, Operand(r0), SetCC);
- // If the property has been removed while iterating, we just skip it.
- node->continue_target()->Branch(eq);
-
- end_del_check.Bind();
- // Store the entry in the 'each' expression and take another spin in the
- // loop. r3: i'th entry of the enum cache (or string there of)
- frame_->EmitPush(r3); // push entry
- { VirtualFrame::RegisterAllocationScope scope(this);
- Reference each(this, node->each());
- if (!each.is_illegal()) {
- if (each.size() > 0) {
- // Loading a reference may leave the frame in an unspilled state.
- frame_->SpillAll(); // Sync stack to memory.
- // Get the value (under the reference on the stack) from memory.
- __ ldr(r0, frame_->ElementAt(each.size()));
- frame_->EmitPush(r0);
- each.SetValue(NOT_CONST_INIT, UNLIKELY_SMI);
- frame_->Drop(2); // The result of the set and the extra pushed value.
- } else {
- // If the reference was to a slot we rely on the convenient property
- // that it doesn't matter whether a value (eg, ebx pushed above) is
- // right on top of or right underneath a zero-sized reference.
- each.SetValue(NOT_CONST_INIT, UNLIKELY_SMI);
- frame_->Drop(1); // Drop the result of the set operation.
- }
- }
- }
- // Body.
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- { VirtualFrame::RegisterAllocationScope scope(this);
- Visit(node->body());
- }
-
- // Next. Reestablish a spilled frame in case we are coming here via
- // a continue in the body.
- node->continue_target()->Bind();
- frame_->SpillAll();
- frame_->EmitPop(r0);
- __ add(r0, r0, Operand(Smi::FromInt(1)));
- frame_->EmitPush(r0);
- entry.Jump();
-
- // Cleanup. No need to spill because VirtualFrame::Drop is safe for
- // any frame.
- node->break_target()->Bind();
- frame_->Drop(5);
-
- // Exit.
- exit.Bind();
- node->continue_target()->Unuse();
- node->break_target()->Unuse();
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitTryCatchStatement(TryCatchStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- VirtualFrame::SpilledScope spilled_scope(frame_);
- Comment cmnt(masm_, "[ TryCatchStatement");
- CodeForStatementPosition(node);
-
- JumpTarget try_block;
- JumpTarget exit;
-
- try_block.Call();
- // --- Catch block ---
- frame_->EmitPush(r0);
-
- // Store the caught exception in the catch variable.
- Variable* catch_var = node->catch_var()->var();
- ASSERT(catch_var != NULL && catch_var->AsSlot() != NULL);
- StoreToSlot(catch_var->AsSlot(), NOT_CONST_INIT);
-
- // Remove the exception from the stack.
- frame_->Drop();
-
- { VirtualFrame::RegisterAllocationScope scope(this);
- VisitStatements(node->catch_block()->statements());
- }
- if (frame_ != NULL) {
- exit.Jump();
- }
-
-
- // --- Try block ---
- try_block.Bind();
-
- frame_->PushTryHandler(TRY_CATCH_HANDLER);
- int handler_height = frame_->height();
-
- // Shadow the labels for all escapes from the try block, including
- // returns. During shadowing, the original label is hidden as the
- // LabelShadow and operations on the original actually affect the
- // shadowing label.
- //
- // We should probably try to unify the escaping labels and the return
- // label.
- int nof_escapes = node->escaping_targets()->length();
- List<ShadowTarget*> shadows(1 + nof_escapes);
-
- // Add the shadow target for the function return.
- static const int kReturnShadowIndex = 0;
- shadows.Add(new ShadowTarget(&function_return_));
- bool function_return_was_shadowed = function_return_is_shadowed_;
- function_return_is_shadowed_ = true;
- ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_);
-
- // Add the remaining shadow targets.
- for (int i = 0; i < nof_escapes; i++) {
- shadows.Add(new ShadowTarget(node->escaping_targets()->at(i)));
- }
-
- // Generate code for the statements in the try block.
- { VirtualFrame::RegisterAllocationScope scope(this);
- VisitStatements(node->try_block()->statements());
- }
-
- // Stop the introduced shadowing and count the number of required unlinks.
- // After shadowing stops, the original labels are unshadowed and the
- // LabelShadows represent the formerly shadowing labels.
- bool has_unlinks = false;
- for (int i = 0; i < shadows.length(); i++) {
- shadows[i]->StopShadowing();
- has_unlinks = has_unlinks || shadows[i]->is_linked();
- }
- function_return_is_shadowed_ = function_return_was_shadowed;
-
- // Get an external reference to the handler address.
- ExternalReference handler_address(Isolate::k_handler_address, isolate());
-
- // If we can fall off the end of the try block, unlink from try chain.
- if (has_valid_frame()) {
- // The next handler address is on top of the frame. Unlink from
- // the handler list and drop the rest of this handler from the
- // frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(r1); // r0 can contain the return value.
- __ mov(r3, Operand(handler_address));
- __ str(r1, MemOperand(r3));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
- if (has_unlinks) {
- exit.Jump();
- }
- }
-
- // Generate unlink code for the (formerly) shadowing labels that have been
- // jumped to. Deallocate each shadow target.
- for (int i = 0; i < shadows.length(); i++) {
- if (shadows[i]->is_linked()) {
- // Unlink from try chain;
- shadows[i]->Bind();
- // Because we can be jumping here (to spilled code) from unspilled
- // code, we need to reestablish a spilled frame at this block.
- frame_->SpillAll();
-
- // Reload sp from the top handler, because some statements that we
- // break from (eg, for...in) may have left stuff on the stack.
- __ mov(r3, Operand(handler_address));
- __ ldr(sp, MemOperand(r3));
- frame_->Forget(frame_->height() - handler_height);
-
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(r1); // r0 can contain the return value.
- __ str(r1, MemOperand(r3));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- if (!function_return_is_shadowed_ && i == kReturnShadowIndex) {
- frame_->PrepareForReturn();
- }
- shadows[i]->other_target()->Jump();
- }
- }
-
- exit.Bind();
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- VirtualFrame::SpilledScope spilled_scope(frame_);
- Comment cmnt(masm_, "[ TryFinallyStatement");
- CodeForStatementPosition(node);
-
- // State: Used to keep track of reason for entering the finally
- // block. Should probably be extended to hold information for
- // break/continue from within the try block.
- enum { FALLING, THROWING, JUMPING };
-
- JumpTarget try_block;
- JumpTarget finally_block;
-
- try_block.Call();
-
- frame_->EmitPush(r0); // save exception object on the stack
- // In case of thrown exceptions, this is where we continue.
- __ mov(r2, Operand(Smi::FromInt(THROWING)));
- finally_block.Jump();
-
- // --- Try block ---
- try_block.Bind();
-
- frame_->PushTryHandler(TRY_FINALLY_HANDLER);
- int handler_height = frame_->height();
-
- // Shadow the labels for all escapes from the try block, including
- // returns. Shadowing hides the original label as the LabelShadow and
- // operations on the original actually affect the shadowing label.
- //
- // We should probably try to unify the escaping labels and the return
- // label.
- int nof_escapes = node->escaping_targets()->length();
- List<ShadowTarget*> shadows(1 + nof_escapes);
-
- // Add the shadow target for the function return.
- static const int kReturnShadowIndex = 0;
- shadows.Add(new ShadowTarget(&function_return_));
- bool function_return_was_shadowed = function_return_is_shadowed_;
- function_return_is_shadowed_ = true;
- ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_);
-
- // Add the remaining shadow targets.
- for (int i = 0; i < nof_escapes; i++) {
- shadows.Add(new ShadowTarget(node->escaping_targets()->at(i)));
- }
-
- // Generate code for the statements in the try block.
- { VirtualFrame::RegisterAllocationScope scope(this);
- VisitStatements(node->try_block()->statements());
- }
-
- // Stop the introduced shadowing and count the number of required unlinks.
- // After shadowing stops, the original labels are unshadowed and the
- // LabelShadows represent the formerly shadowing labels.
- int nof_unlinks = 0;
- for (int i = 0; i < shadows.length(); i++) {
- shadows[i]->StopShadowing();
- if (shadows[i]->is_linked()) nof_unlinks++;
- }
- function_return_is_shadowed_ = function_return_was_shadowed;
-
- // Get an external reference to the handler address.
- ExternalReference handler_address(Isolate::k_handler_address, isolate());
-
- // If we can fall off the end of the try block, unlink from the try
- // chain and set the state on the frame to FALLING.
- if (has_valid_frame()) {
- // The next handler address is on top of the frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(r1);
- __ mov(r3, Operand(handler_address));
- __ str(r1, MemOperand(r3));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- // Fake a top of stack value (unneeded when FALLING) and set the
- // state in r2, then jump around the unlink blocks if any.
- __ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
- frame_->EmitPush(r0);
- __ mov(r2, Operand(Smi::FromInt(FALLING)));
- if (nof_unlinks > 0) {
- finally_block.Jump();
- }
- }
-
- // Generate code to unlink and set the state for the (formerly)
- // shadowing targets that have been jumped to.
- for (int i = 0; i < shadows.length(); i++) {
- if (shadows[i]->is_linked()) {
- // If we have come from the shadowed return, the return value is
- // in (a non-refcounted reference to) r0. We must preserve it
- // until it is pushed.
- //
- // Because we can be jumping here (to spilled code) from
- // unspilled code, we need to reestablish a spilled frame at
- // this block.
- shadows[i]->Bind();
- frame_->SpillAll();
-
- // Reload sp from the top handler, because some statements that
- // we break from (eg, for...in) may have left stuff on the
- // stack.
- __ mov(r3, Operand(handler_address));
- __ ldr(sp, MemOperand(r3));
- frame_->Forget(frame_->height() - handler_height);
-
- // Unlink this handler and drop it from the frame. The next
- // handler address is currently on top of the frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(r1);
- __ str(r1, MemOperand(r3));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- if (i == kReturnShadowIndex) {
- // If this label shadowed the function return, materialize the
- // return value on the stack.
- frame_->EmitPush(r0);
- } else {
- // Fake TOS for targets that shadowed breaks and continues.
- __ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
- frame_->EmitPush(r0);
- }
- __ mov(r2, Operand(Smi::FromInt(JUMPING + i)));
- if (--nof_unlinks > 0) {
- // If this is not the last unlink block, jump around the next.
- finally_block.Jump();
- }
- }
- }
-
- // --- Finally block ---
- finally_block.Bind();
-
- // Push the state on the stack.
- frame_->EmitPush(r2);
-
- // We keep two elements on the stack - the (possibly faked) result
- // and the state - while evaluating the finally block.
- //
- // Generate code for the statements in the finally block.
- { VirtualFrame::RegisterAllocationScope scope(this);
- VisitStatements(node->finally_block()->statements());
- }
-
- if (has_valid_frame()) {
- // Restore state and return value or faked TOS.
- frame_->EmitPop(r2);
- frame_->EmitPop(r0);
- }
-
- // Generate code to jump to the right destination for all used
- // formerly shadowing targets. Deallocate each shadow target.
- for (int i = 0; i < shadows.length(); i++) {
- if (has_valid_frame() && shadows[i]->is_bound()) {
- JumpTarget* original = shadows[i]->other_target();
- __ cmp(r2, Operand(Smi::FromInt(JUMPING + i)));
- if (!function_return_is_shadowed_ && i == kReturnShadowIndex) {
- JumpTarget skip;
- skip.Branch(ne);
- frame_->PrepareForReturn();
- original->Jump();
- skip.Bind();
- } else {
- original->Branch(eq);
- }
- }
- }
-
- if (has_valid_frame()) {
- // Check if we need to rethrow the exception.
- JumpTarget exit;
- __ cmp(r2, Operand(Smi::FromInt(THROWING)));
- exit.Branch(ne);
-
- // Rethrow exception.
- frame_->EmitPush(r0);
- frame_->CallRuntime(Runtime::kReThrow, 1);
-
- // Done.
- exit.Bind();
- }
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitDebuggerStatement(DebuggerStatement* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ DebuggerStatament");
- CodeForStatementPosition(node);
-#ifdef ENABLE_DEBUGGER_SUPPORT
- frame_->DebugBreak();
-#endif
- // Ignore the return value.
- ASSERT(frame_->height() == original_height);
-}
-
-
-void CodeGenerator::InstantiateFunction(
- Handle<SharedFunctionInfo> function_info,
- bool pretenure) {
- // Use the fast case closure allocation code that allocates in new
- // space for nested functions that don't need literals cloning.
- if (!pretenure &&
- scope()->is_function_scope() &&
- function_info->num_literals() == 0) {
- FastNewClosureStub stub(
- function_info->strict_mode() ? kStrictMode : kNonStrictMode);
- frame_->EmitPush(Operand(function_info));
- frame_->SpillAll();
- frame_->CallStub(&stub, 1);
- frame_->EmitPush(r0);
- } else {
- // Create a new closure.
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(function_info));
- frame_->EmitPush(Operand(pretenure
- ? FACTORY->true_value()
- : FACTORY->false_value()));
- frame_->CallRuntime(Runtime::kNewClosure, 3);
- frame_->EmitPush(r0);
- }
-}
-
-
-void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ FunctionLiteral");
-
- // Build the function info and instantiate it.
- Handle<SharedFunctionInfo> function_info =
- Compiler::BuildFunctionInfo(node, script());
- if (function_info.is_null()) {
- SetStackOverflow();
- ASSERT(frame_->height() == original_height);
- return;
- }
- InstantiateFunction(function_info, node->pretenure());
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitSharedFunctionInfoLiteral(
- SharedFunctionInfoLiteral* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ SharedFunctionInfoLiteral");
- InstantiateFunction(node->shared_function_info(), false);
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitConditional(Conditional* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Conditional");
- JumpTarget then;
- JumpTarget else_;
- LoadCondition(node->condition(), &then, &else_, true);
- if (has_valid_frame()) {
- Branch(false, &else_);
- }
- if (has_valid_frame() || then.is_linked()) {
- then.Bind();
- Load(node->then_expression());
- }
- if (else_.is_linked()) {
- JumpTarget exit;
- if (has_valid_frame()) exit.Jump();
- else_.Bind();
- Load(node->else_expression());
- if (exit.is_linked()) exit.Bind();
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
- if (slot->type() == Slot::LOOKUP) {
- ASSERT(slot->var()->is_dynamic());
-
- // JumpTargets do not yet support merging frames so the frame must be
- // spilled when jumping to these targets.
- JumpTarget slow;
- JumpTarget done;
-
- // Generate fast case for loading from slots that correspond to
- // local/global variables or arguments unless they are shadowed by
- // eval-introduced bindings.
- EmitDynamicLoadFromSlotFastCase(slot,
- typeof_state,
- &slow,
- &done);
-
- slow.Bind();
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(slot->var()->name()));
-
- if (typeof_state == INSIDE_TYPEOF) {
- frame_->CallRuntime(Runtime::kLoadContextSlotNoReferenceError, 2);
- } else {
- frame_->CallRuntime(Runtime::kLoadContextSlot, 2);
- }
-
- done.Bind();
- frame_->EmitPush(r0);
-
- } else {
- Register scratch = VirtualFrame::scratch0();
- TypeInfo info = type_info(slot);
- frame_->EmitPush(SlotOperand(slot, scratch), info);
-
- if (slot->var()->mode() == Variable::CONST) {
- // Const slots may contain 'the hole' value (the constant hasn't been
- // initialized yet) which needs to be converted into the 'undefined'
- // value.
- Comment cmnt(masm_, "[ Unhole const");
- Register tos = frame_->PopToRegister();
- __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
- __ cmp(tos, ip);
- __ LoadRoot(tos, Heap::kUndefinedValueRootIndex, eq);
- frame_->EmitPush(tos);
- }
- }
-}
-
-
-void CodeGenerator::LoadFromSlotCheckForArguments(Slot* slot,
- TypeofState state) {
- VirtualFrame::RegisterAllocationScope scope(this);
- LoadFromSlot(slot, state);
-
- // Bail out quickly if we're not using lazy arguments allocation.
- if (ArgumentsMode() != LAZY_ARGUMENTS_ALLOCATION) return;
-
- // ... or if the slot isn't a non-parameter arguments slot.
- if (slot->type() == Slot::PARAMETER || !slot->is_arguments()) return;
-
- // Load the loaded value from the stack into a register but leave it on the
- // stack.
- Register tos = frame_->Peek();
-
- // If the loaded value is the sentinel that indicates that we
- // haven't loaded the arguments object yet, we need to do it now.
- JumpTarget exit;
- __ LoadRoot(ip, Heap::kArgumentsMarkerRootIndex);
- __ cmp(tos, ip);
- exit.Branch(ne);
- frame_->Drop();
- StoreArgumentsObject(false);
- exit.Bind();
-}
-
-
-void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) {
- ASSERT(slot != NULL);
- VirtualFrame::RegisterAllocationScope scope(this);
- if (slot->type() == Slot::LOOKUP) {
- ASSERT(slot->var()->is_dynamic());
-
- // For now, just do a runtime call.
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(slot->var()->name()));
-
- if (init_state == CONST_INIT) {
- // Same as the case for a normal store, but ignores attribute
- // (e.g. READ_ONLY) of context slot so that we can initialize
- // const properties (introduced via eval("const foo = (some
- // expr);")). Also, uses the current function context instead of
- // the top context.
- //
- // Note that we must declare the foo upon entry of eval(), via a
- // context slot declaration, but we cannot initialize it at the
- // same time, because the const declaration may be at the end of
- // the eval code (sigh...) and the const variable may have been
- // used before (where its value is 'undefined'). Thus, we can only
- // do the initialization when we actually encounter the expression
- // and when the expression operands are defined and valid, and
- // thus we need the split into 2 operations: declaration of the
- // context slot followed by initialization.
- frame_->CallRuntime(Runtime::kInitializeConstContextSlot, 3);
- } else {
- frame_->EmitPush(Operand(Smi::FromInt(strict_mode_flag())));
- frame_->CallRuntime(Runtime::kStoreContextSlot, 4);
- }
- // Storing a variable must keep the (new) value on the expression
- // stack. This is necessary for compiling assignment expressions.
- frame_->EmitPush(r0);
-
- } else {
- ASSERT(!slot->var()->is_dynamic());
- Register scratch = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
-
- // The frame must be spilled when branching to this target.
- JumpTarget exit;
-
- if (init_state == CONST_INIT) {
- ASSERT(slot->var()->mode() == Variable::CONST);
- // Only the first const initialization must be executed (the slot
- // still contains 'the hole' value). When the assignment is
- // executed, the code is identical to a normal store (see below).
- Comment cmnt(masm_, "[ Init const");
- __ ldr(scratch, SlotOperand(slot, scratch));
- __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
- __ cmp(scratch, ip);
- exit.Branch(ne);
- }
-
- // We must execute the store. Storing a variable must keep the
- // (new) value on the stack. This is necessary for compiling
- // assignment expressions.
- //
- // Note: We will reach here even with slot->var()->mode() ==
- // Variable::CONST because of const declarations which will
- // initialize consts to 'the hole' value and by doing so, end up
- // calling this code. r2 may be loaded with context; used below in
- // RecordWrite.
- Register tos = frame_->Peek();
- __ str(tos, SlotOperand(slot, scratch));
- if (slot->type() == Slot::CONTEXT) {
- // Skip write barrier if the written value is a smi.
- __ tst(tos, Operand(kSmiTagMask));
- // We don't use tos any more after here.
- exit.Branch(eq);
- // scratch is loaded with context when calling SlotOperand above.
- int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
- // We need an extra register. Until we have a way to do that in the
- // virtual frame we will cheat and ask for a free TOS register.
- Register scratch3 = frame_->GetTOSRegister();
- __ RecordWrite(scratch, Operand(offset), scratch2, scratch3);
- }
- // If we definitely did not jump over the assignment, we do not need
- // to bind the exit label. Doing so can defeat peephole
- // optimization.
- if (init_state == CONST_INIT || slot->type() == Slot::CONTEXT) {
- exit.Bind();
- }
- }
-}
-
-
-void CodeGenerator::LoadFromGlobalSlotCheckExtensions(Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow) {
- // Check that no extension objects have been created by calls to
- // eval from the current scope to the global scope.
- Register tmp = frame_->scratch0();
- Register tmp2 = frame_->scratch1();
- Register context = cp;
- Scope* s = scope();
- while (s != NULL) {
- if (s->num_heap_slots() > 0) {
- if (s->calls_eval()) {
- frame_->SpillAll();
- // Check that extension is NULL.
- __ ldr(tmp2, ContextOperand(context, Context::EXTENSION_INDEX));
- __ tst(tmp2, tmp2);
- slow->Branch(ne);
- }
- // Load next context in chain.
- __ ldr(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
- __ ldr(tmp, FieldMemOperand(tmp, JSFunction::kContextOffset));
- context = tmp;
- }
- // If no outer scope calls eval, we do not need to check more
- // context extensions.
- if (!s->outer_scope_calls_eval() || s->is_eval_scope()) break;
- s = s->outer_scope();
- }
-
- if (s->is_eval_scope()) {
- frame_->SpillAll();
- Label next, fast;
- __ Move(tmp, context);
- __ bind(&next);
- // Terminate at global context.
- __ ldr(tmp2, FieldMemOperand(tmp, HeapObject::kMapOffset));
- __ LoadRoot(ip, Heap::kGlobalContextMapRootIndex);
- __ cmp(tmp2, ip);
- __ b(eq, &fast);
- // Check that extension is NULL.
- __ ldr(tmp2, ContextOperand(tmp, Context::EXTENSION_INDEX));
- __ tst(tmp2, tmp2);
- slow->Branch(ne);
- // Load next context in chain.
- __ ldr(tmp, ContextOperand(tmp, Context::CLOSURE_INDEX));
- __ ldr(tmp, FieldMemOperand(tmp, JSFunction::kContextOffset));
- __ b(&next);
- __ bind(&fast);
- }
-
- // Load the global object.
- LoadGlobal();
- // Setup the name register and call load IC.
- frame_->CallLoadIC(slot->var()->name(),
- typeof_state == INSIDE_TYPEOF
- ? RelocInfo::CODE_TARGET
- : RelocInfo::CODE_TARGET_CONTEXT);
-}
-
-
-void CodeGenerator::EmitDynamicLoadFromSlotFastCase(Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow,
- JumpTarget* done) {
- // Generate fast-case code for variables that might be shadowed by
- // eval-introduced variables. Eval is used a lot without
- // introducing variables. In those cases, we do not want to
- // perform a runtime call for all variables in the scope
- // containing the eval.
- if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
- LoadFromGlobalSlotCheckExtensions(slot, typeof_state, slow);
- frame_->SpillAll();
- done->Jump();
-
- } else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
- frame_->SpillAll();
- Slot* potential_slot = slot->var()->local_if_not_shadowed()->AsSlot();
- Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
- if (potential_slot != NULL) {
- // Generate fast case for locals that rewrite to slots.
- __ ldr(r0,
- ContextSlotOperandCheckExtensions(potential_slot,
- r1,
- r2,
- slow));
- if (potential_slot->var()->mode() == Variable::CONST) {
- __ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
- __ cmp(r0, ip);
- __ LoadRoot(r0, Heap::kUndefinedValueRootIndex, eq);
- }
- done->Jump();
- } else if (rewrite != NULL) {
- // Generate fast case for argument loads.
- Property* property = rewrite->AsProperty();
- if (property != NULL) {
- VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
- Literal* key_literal = property->key()->AsLiteral();
- if (obj_proxy != NULL &&
- key_literal != NULL &&
- obj_proxy->IsArguments() &&
- key_literal->handle()->IsSmi()) {
- // Load arguments object if there are no eval-introduced
- // variables. Then load the argument from the arguments
- // object using keyed load.
- __ ldr(r0,
- ContextSlotOperandCheckExtensions(obj_proxy->var()->AsSlot(),
- r1,
- r2,
- slow));
- frame_->EmitPush(r0);
- __ mov(r1, Operand(key_literal->handle()));
- frame_->EmitPush(r1);
- EmitKeyedLoad();
- done->Jump();
- }
- }
- }
- }
-}
-
-
-void CodeGenerator::VisitSlot(Slot* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Slot");
- LoadFromSlotCheckForArguments(node, NOT_INSIDE_TYPEOF);
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitVariableProxy(VariableProxy* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ VariableProxy");
-
- Variable* var = node->var();
- Expression* expr = var->rewrite();
- if (expr != NULL) {
- Visit(expr);
- } else {
- ASSERT(var->is_global());
- Reference ref(this, node);
- ref.GetValue();
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitLiteral(Literal* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Literal");
- Register reg = frame_->GetTOSRegister();
- bool is_smi = node->handle()->IsSmi();
- __ mov(reg, Operand(node->handle()));
- frame_->EmitPush(reg, is_smi ? TypeInfo::Smi() : TypeInfo::Unknown());
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitRegExpLiteral(RegExpLiteral* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ RexExp Literal");
-
- Register tmp = VirtualFrame::scratch0();
- // Free up a TOS register that can be used to push the literal.
- Register literal = frame_->GetTOSRegister();
-
- // Retrieve the literal array and check the allocated entry.
-
- // Load the function of this activation.
- __ ldr(tmp, frame_->Function());
-
- // Load the literals array of the function.
- __ ldr(tmp, FieldMemOperand(tmp, JSFunction::kLiteralsOffset));
-
- // Load the literal at the ast saved index.
- int literal_offset =
- FixedArray::kHeaderSize + node->literal_index() * kPointerSize;
- __ ldr(literal, FieldMemOperand(tmp, literal_offset));
-
- JumpTarget materialized;
- __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
- __ cmp(literal, ip);
- // This branch locks the virtual frame at the done label to match the
- // one we have here, where the literal register is not on the stack and
- // nothing is spilled.
- materialized.Branch(ne);
-
- // If the entry is undefined we call the runtime system to compute
- // the literal.
- // literal array (0)
- frame_->EmitPush(tmp);
- // literal index (1)
- frame_->EmitPush(Operand(Smi::FromInt(node->literal_index())));
- // RegExp pattern (2)
- frame_->EmitPush(Operand(node->pattern()));
- // RegExp flags (3)
- frame_->EmitPush(Operand(node->flags()));
- frame_->CallRuntime(Runtime::kMaterializeRegExpLiteral, 4);
- __ Move(literal, r0);
-
- materialized.Bind();
-
- frame_->EmitPush(literal);
- int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
- frame_->EmitPush(Operand(Smi::FromInt(size)));
- frame_->CallRuntime(Runtime::kAllocateInNewSpace, 1);
- // TODO(lrn): Use AllocateInNewSpace macro with fallback to runtime.
- // r0 is newly allocated space.
-
- // Reuse literal variable with (possibly) a new register, still holding
- // the materialized boilerplate.
- literal = frame_->PopToRegister(r0);
-
- __ CopyFields(r0, literal, tmp.bit(), size / kPointerSize);
-
- // Push the clone.
- frame_->EmitPush(r0);
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitObjectLiteral(ObjectLiteral* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ ObjectLiteral");
-
- Register literal = frame_->GetTOSRegister();
- // Load the function of this activation.
- __ ldr(literal, frame_->Function());
- // Literal array.
- __ ldr(literal, FieldMemOperand(literal, JSFunction::kLiteralsOffset));
- frame_->EmitPush(literal);
- // Literal index.
- frame_->EmitPush(Operand(Smi::FromInt(node->literal_index())));
- // Constant properties.
- frame_->EmitPush(Operand(node->constant_properties()));
- // Should the object literal have fast elements?
- frame_->EmitPush(Operand(Smi::FromInt(node->fast_elements() ? 1 : 0)));
- if (node->depth() > 1) {
- frame_->CallRuntime(Runtime::kCreateObjectLiteral, 4);
- } else {
- frame_->CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
- }
- frame_->EmitPush(r0); // save the result
-
- // Mark all computed expressions that are bound to a key that
- // is shadowed by a later occurrence of the same key. For the
- // marked expressions, no store code is emitted.
- node->CalculateEmitStore();
-
- for (int i = 0; i < node->properties()->length(); i++) {
- // At the start of each iteration, the top of stack contains
- // the newly created object literal.
- ObjectLiteral::Property* property = node->properties()->at(i);
- Literal* key = property->key();
- Expression* value = property->value();
- switch (property->kind()) {
- case ObjectLiteral::Property::CONSTANT:
- break;
- case ObjectLiteral::Property::MATERIALIZED_LITERAL:
- if (CompileTimeValue::IsCompileTimeValue(property->value())) break;
- // else fall through
- case ObjectLiteral::Property::COMPUTED:
- if (key->handle()->IsSymbol()) {
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kStoreIC_Initialize));
- Load(value);
- if (property->emit_store()) {
- frame_->PopToR0();
- // Fetch the object literal.
- frame_->SpillAllButCopyTOSToR1();
- __ mov(r2, Operand(key->handle()));
- frame_->CallCodeObject(ic, RelocInfo::CODE_TARGET, 0);
- } else {
- frame_->Drop();
- }
- break;
- }
- // else fall through
- case ObjectLiteral::Property::PROTOTYPE: {
- frame_->Dup();
- Load(key);
- Load(value);
- if (property->emit_store()) {
- frame_->EmitPush(Operand(Smi::FromInt(NONE))); // PropertyAttributes
- frame_->CallRuntime(Runtime::kSetProperty, 4);
- } else {
- frame_->Drop(3);
- }
- break;
- }
- case ObjectLiteral::Property::SETTER: {
- frame_->Dup();
- Load(key);
- frame_->EmitPush(Operand(Smi::FromInt(1)));
- Load(value);
- frame_->CallRuntime(Runtime::kDefineAccessor, 4);
- break;
- }
- case ObjectLiteral::Property::GETTER: {
- frame_->Dup();
- Load(key);
- frame_->EmitPush(Operand(Smi::FromInt(0)));
- Load(value);
- frame_->CallRuntime(Runtime::kDefineAccessor, 4);
- break;
- }
- }
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitArrayLiteral(ArrayLiteral* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ ArrayLiteral");
-
- Register tos = frame_->GetTOSRegister();
- // Load the function of this activation.
- __ ldr(tos, frame_->Function());
- // Load the literals array of the function.
- __ ldr(tos, FieldMemOperand(tos, JSFunction::kLiteralsOffset));
- frame_->EmitPush(tos);
- frame_->EmitPush(Operand(Smi::FromInt(node->literal_index())));
- frame_->EmitPush(Operand(node->constant_elements()));
- int length = node->values()->length();
- if (node->constant_elements()->map() == HEAP->fixed_cow_array_map()) {
- FastCloneShallowArrayStub stub(
- FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS, length);
- frame_->CallStub(&stub, 3);
- __ IncrementCounter(masm_->isolate()->counters()->cow_arrays_created_stub(),
- 1, r1, r2);
- } else if (node->depth() > 1) {
- frame_->CallRuntime(Runtime::kCreateArrayLiteral, 3);
- } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
- frame_->CallRuntime(Runtime::kCreateArrayLiteralShallow, 3);
- } else {
- FastCloneShallowArrayStub stub(
- FastCloneShallowArrayStub::CLONE_ELEMENTS, length);
- frame_->CallStub(&stub, 3);
- }
- frame_->EmitPush(r0); // save the result
- // r0: created object literal
-
- // Generate code to set the elements in the array that are not
- // literals.
- for (int i = 0; i < node->values()->length(); i++) {
- Expression* value = node->values()->at(i);
-
- // If value is a literal the property value is already set in the
- // boilerplate object.
- if (value->AsLiteral() != NULL) continue;
- // If value is a materialized literal the property value is already set
- // in the boilerplate object if it is simple.
- if (CompileTimeValue::IsCompileTimeValue(value)) continue;
-
- // The property must be set by generated code.
- Load(value);
- frame_->PopToR0();
- // Fetch the object literal.
- frame_->SpillAllButCopyTOSToR1();
-
- // Get the elements array.
- __ ldr(r1, FieldMemOperand(r1, JSObject::kElementsOffset));
-
- // Write to the indexed properties array.
- int offset = i * kPointerSize + FixedArray::kHeaderSize;
- __ str(r0, FieldMemOperand(r1, offset));
-
- // Update the write barrier for the array address.
- __ RecordWrite(r1, Operand(offset), r3, r2);
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitCatchExtensionObject(CatchExtensionObject* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- // Call runtime routine to allocate the catch extension object and
- // assign the exception value to the catch variable.
- Comment cmnt(masm_, "[ CatchExtensionObject");
- Load(node->key());
- Load(node->value());
- frame_->CallRuntime(Runtime::kCreateCatchExtensionObject, 2);
- frame_->EmitPush(r0);
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::EmitSlotAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm(), "[ Variable Assignment");
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- ASSERT(var != NULL);
- Slot* slot = var->AsSlot();
- ASSERT(slot != NULL);
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
-
- // Perform the binary operation.
- Literal* literal = node->value()->AsLiteral();
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- if (literal != NULL && literal->handle()->IsSmi()) {
- SmiOperation(node->binary_op(),
- literal->handle(),
- false,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- GenerateInlineSmi inline_smi =
- loop_nesting() > 0 ? GENERATE_INLINE_SMI : DONT_GENERATE_INLINE_SMI;
- if (literal != NULL) {
- ASSERT(!literal->handle()->IsSmi());
- inline_smi = DONT_GENERATE_INLINE_SMI;
- }
- Load(node->value());
- GenericBinaryOperation(node->binary_op(),
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE,
- inline_smi);
- }
- } else {
- Load(node->value());
- }
-
- // Perform the assignment.
- if (var->mode() != Variable::CONST || node->op() == Token::INIT_CONST) {
- CodeForSourcePosition(node->position());
- StoreToSlot(slot,
- node->op() == Token::INIT_CONST ? CONST_INIT : NOT_CONST_INIT);
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::EmitNamedPropertyAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm(), "[ Named Property Assignment");
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- Property* prop = node->target()->AsProperty();
- ASSERT(var == NULL || (prop == NULL && var->is_global()));
-
- // Initialize name and evaluate the receiver sub-expression if necessary. If
- // the receiver is trivial it is not placed on the stack at this point, but
- // loaded whenever actually needed.
- Handle<String> name;
- bool is_trivial_receiver = false;
- if (var != NULL) {
- name = var->name();
- } else {
- Literal* lit = prop->key()->AsLiteral();
- ASSERT_NOT_NULL(lit);
- name = Handle<String>::cast(lit->handle());
- // Do not materialize the receiver on the frame if it is trivial.
- is_trivial_receiver = prop->obj()->IsTrivial();
- if (!is_trivial_receiver) Load(prop->obj());
- }
-
- // Change to slow case in the beginning of an initialization block to
- // avoid the quadratic behavior of repeatedly adding fast properties.
- if (node->starts_initialization_block()) {
- // Initialization block consists of assignments of the form expr.x = ..., so
- // this will never be an assignment to a variable, so there must be a
- // receiver object.
- ASSERT_EQ(NULL, var);
- if (is_trivial_receiver) {
- Load(prop->obj());
- } else {
- frame_->Dup();
- }
- frame_->CallRuntime(Runtime::kToSlowProperties, 1);
- }
-
- // Change to fast case at the end of an initialization block. To prepare for
- // that add an extra copy of the receiver to the frame, so that it can be
- // converted back to fast case after the assignment.
- if (node->ends_initialization_block() && !is_trivial_receiver) {
- frame_->Dup();
- }
-
- // Stack layout:
- // [tos] : receiver (only materialized if non-trivial)
- // [tos+1] : receiver if at the end of an initialization block
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- if (is_trivial_receiver) {
- Load(prop->obj());
- } else if (var != NULL) {
- LoadGlobal();
- } else {
- frame_->Dup();
- }
- EmitNamedLoad(name, var != NULL);
-
- // Perform the binary operation.
- Literal* literal = node->value()->AsLiteral();
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- if (literal != NULL && literal->handle()->IsSmi()) {
- SmiOperation(node->binary_op(),
- literal->handle(),
- false,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- GenerateInlineSmi inline_smi =
- loop_nesting() > 0 ? GENERATE_INLINE_SMI : DONT_GENERATE_INLINE_SMI;
- if (literal != NULL) {
- ASSERT(!literal->handle()->IsSmi());
- inline_smi = DONT_GENERATE_INLINE_SMI;
- }
- Load(node->value());
- GenericBinaryOperation(node->binary_op(),
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE,
- inline_smi);
- }
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Stack layout:
- // [tos] : value
- // [tos+1] : receiver (only materialized if non-trivial)
- // [tos+2] : receiver if at the end of an initialization block
-
- // Perform the assignment. It is safe to ignore constants here.
- ASSERT(var == NULL || var->mode() != Variable::CONST);
- ASSERT_NE(Token::INIT_CONST, node->op());
- if (is_trivial_receiver) {
- // Load the receiver and swap with the value.
- Load(prop->obj());
- Register t0 = frame_->PopToRegister();
- Register t1 = frame_->PopToRegister(t0);
- frame_->EmitPush(t0);
- frame_->EmitPush(t1);
- }
- CodeForSourcePosition(node->position());
- bool is_contextual = (var != NULL);
- EmitNamedStore(name, is_contextual);
- frame_->EmitPush(r0);
-
- // Change to fast case at the end of an initialization block.
- if (node->ends_initialization_block()) {
- ASSERT_EQ(NULL, var);
- // The argument to the runtime call is the receiver.
- if (is_trivial_receiver) {
- Load(prop->obj());
- } else {
- // A copy of the receiver is below the value of the assignment. Swap
- // the receiver and the value of the assignment expression.
- Register t0 = frame_->PopToRegister();
- Register t1 = frame_->PopToRegister(t0);
- frame_->EmitPush(t0);
- frame_->EmitPush(t1);
- }
- frame_->CallRuntime(Runtime::kToFastProperties, 1);
- }
-
- // Stack layout:
- // [tos] : result
-
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::EmitKeyedPropertyAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Keyed Property Assignment");
- Property* prop = node->target()->AsProperty();
- ASSERT_NOT_NULL(prop);
-
- // Evaluate the receiver subexpression.
- Load(prop->obj());
-
- WriteBarrierCharacter wb_info;
-
- // Change to slow case in the beginning of an initialization block to
- // avoid the quadratic behavior of repeatedly adding fast properties.
- if (node->starts_initialization_block()) {
- frame_->Dup();
- frame_->CallRuntime(Runtime::kToSlowProperties, 1);
- }
-
- // Change to fast case at the end of an initialization block. To prepare for
- // that add an extra copy of the receiver to the frame, so that it can be
- // converted back to fast case after the assignment.
- if (node->ends_initialization_block()) {
- frame_->Dup();
- }
-
- // Evaluate the key subexpression.
- Load(prop->key());
-
- // Stack layout:
- // [tos] : key
- // [tos+1] : receiver
- // [tos+2] : receiver if at the end of an initialization block
- //
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- // Duplicate receiver and key for loading the current property value.
- frame_->Dup2();
- EmitKeyedLoad();
- frame_->EmitPush(r0);
-
- // Perform the binary operation.
- Literal* literal = node->value()->AsLiteral();
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- if (literal != NULL && literal->handle()->IsSmi()) {
- SmiOperation(node->binary_op(),
- literal->handle(),
- false,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- GenerateInlineSmi inline_smi =
- loop_nesting() > 0 ? GENERATE_INLINE_SMI : DONT_GENERATE_INLINE_SMI;
- if (literal != NULL) {
- ASSERT(!literal->handle()->IsSmi());
- inline_smi = DONT_GENERATE_INLINE_SMI;
- }
- Load(node->value());
- GenericBinaryOperation(node->binary_op(),
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE,
- inline_smi);
- }
- wb_info = node->type()->IsLikelySmi() ? LIKELY_SMI : UNLIKELY_SMI;
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- wb_info = node->value()->AsLiteral() != NULL ?
- NEVER_NEWSPACE :
- (node->value()->type()->IsLikelySmi() ? LIKELY_SMI : UNLIKELY_SMI);
- }
-
- // Stack layout:
- // [tos] : value
- // [tos+1] : key
- // [tos+2] : receiver
- // [tos+3] : receiver if at the end of an initialization block
-
- // Perform the assignment. It is safe to ignore constants here.
- ASSERT(node->op() != Token::INIT_CONST);
- CodeForSourcePosition(node->position());
- EmitKeyedStore(prop->key()->type(), wb_info);
- frame_->EmitPush(r0);
-
- // Stack layout:
- // [tos] : result
- // [tos+1] : receiver if at the end of an initialization block
-
- // Change to fast case at the end of an initialization block.
- if (node->ends_initialization_block()) {
- // The argument to the runtime call is the extra copy of the receiver,
- // which is below the value of the assignment. Swap the receiver and
- // the value of the assignment expression.
- Register t0 = frame_->PopToRegister();
- Register t1 = frame_->PopToRegister(t0);
- frame_->EmitPush(t1);
- frame_->EmitPush(t0);
- frame_->CallRuntime(Runtime::kToFastProperties, 1);
- }
-
- // Stack layout:
- // [tos] : result
-
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitAssignment(Assignment* node) {
- VirtualFrame::RegisterAllocationScope scope(this);
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Assignment");
-
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- Property* prop = node->target()->AsProperty();
-
- if (var != NULL && !var->is_global()) {
- EmitSlotAssignment(node);
-
- } else if ((prop != NULL && prop->key()->IsPropertyName()) ||
- (var != NULL && var->is_global())) {
- // Properties whose keys are property names and global variables are
- // treated as named property references. We do not need to consider
- // global 'this' because it is not a valid left-hand side.
- EmitNamedPropertyAssignment(node);
-
- } else if (prop != NULL) {
- // Other properties (including rewritten parameters for a function that
- // uses arguments) are keyed property assignments.
- EmitKeyedPropertyAssignment(node);
-
- } else {
- // Invalid left-hand side.
- Load(node->target());
- frame_->CallRuntime(Runtime::kThrowReferenceError, 1);
- // The runtime call doesn't actually return but the code generator will
- // still generate code and expects a certain frame height.
- frame_->EmitPush(r0);
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitThrow(Throw* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Throw");
-
- Load(node->exception());
- CodeForSourcePosition(node->position());
- frame_->CallRuntime(Runtime::kThrow, 1);
- frame_->EmitPush(r0);
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitProperty(Property* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Property");
-
- { Reference property(this, node);
- property.GetValue();
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitCall(Call* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ Call");
-
- Expression* function = node->expression();
- ZoneList<Expression*>* args = node->arguments();
-
- // Standard function call.
- // Check if the function is a variable or a property.
- Variable* var = function->AsVariableProxy()->AsVariable();
- Property* property = function->AsProperty();
-
- // ------------------------------------------------------------------------
- // Fast-case: Use inline caching.
- // ---
- // According to ECMA-262, section 11.2.3, page 44, the function to call
- // must be resolved after the arguments have been evaluated. The IC code
- // automatically handles this by loading the arguments before the function
- // is resolved in cache misses (this also holds for megamorphic calls).
- // ------------------------------------------------------------------------
-
- if (var != NULL && var->is_possibly_eval()) {
- // ----------------------------------
- // JavaScript example: 'eval(arg)' // eval is not known to be shadowed
- // ----------------------------------
-
- // In a call to eval, we first call %ResolvePossiblyDirectEval to
- // resolve the function we need to call and the receiver of the
- // call. Then we call the resolved function using the given
- // arguments.
-
- // Prepare stack for call to resolved function.
- Load(function);
-
- // Allocate a frame slot for the receiver.
- frame_->EmitPushRoot(Heap::kUndefinedValueRootIndex);
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- VirtualFrame::SpilledScope spilled_scope(frame_);
-
- // If we know that eval can only be shadowed by eval-introduced
- // variables we attempt to load the global eval function directly
- // in generated code. If we succeed, there is no need to perform a
- // context lookup in the runtime system.
- JumpTarget done;
- if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
- ASSERT(var->AsSlot()->type() == Slot::LOOKUP);
- JumpTarget slow;
- // Prepare the stack for the call to
- // ResolvePossiblyDirectEvalNoLookup by pushing the loaded
- // function, the first argument to the eval call and the
- // receiver.
- LoadFromGlobalSlotCheckExtensions(var->AsSlot(),
- NOT_INSIDE_TYPEOF,
- &slow);
- frame_->EmitPush(r0);
- if (arg_count > 0) {
- __ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
- frame_->EmitPush(r1);
- } else {
- frame_->EmitPush(r2);
- }
- __ ldr(r1, frame_->Receiver());
- frame_->EmitPush(r1);
-
- // Push the strict mode flag.
- frame_->EmitPush(Operand(Smi::FromInt(strict_mode_flag())));
-
- frame_->CallRuntime(Runtime::kResolvePossiblyDirectEvalNoLookup, 4);
-
- done.Jump();
- slow.Bind();
- }
-
- // Prepare the stack for the call to ResolvePossiblyDirectEval by
- // pushing the loaded function, the first argument to the eval
- // call and the receiver.
- __ ldr(r1, MemOperand(sp, arg_count * kPointerSize + kPointerSize));
- frame_->EmitPush(r1);
- if (arg_count > 0) {
- __ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
- frame_->EmitPush(r1);
- } else {
- frame_->EmitPush(r2);
- }
- __ ldr(r1, frame_->Receiver());
- frame_->EmitPush(r1);
-
- // Push the strict mode flag.
- frame_->EmitPush(Operand(Smi::FromInt(strict_mode_flag())));
-
- // Resolve the call.
- frame_->CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
-
- // If we generated fast-case code bind the jump-target where fast
- // and slow case merge.
- if (done.is_linked()) done.Bind();
-
- // Touch up stack with the right values for the function and the receiver.
- __ str(r0, MemOperand(sp, (arg_count + 1) * kPointerSize));
- __ str(r1, MemOperand(sp, arg_count * kPointerSize));
-
- // Call the function.
- CodeForSourcePosition(node->position());
-
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- CallFunctionStub call_function(arg_count, in_loop, RECEIVER_MIGHT_BE_VALUE);
- frame_->CallStub(&call_function, arg_count + 1);
-
- __ ldr(cp, frame_->Context());
- // Remove the function from the stack.
- frame_->Drop();
- frame_->EmitPush(r0);
-
- } else if (var != NULL && !var->is_this() && var->is_global()) {
- // ----------------------------------
- // JavaScript example: 'foo(1, 2, 3)' // foo is global
- // ----------------------------------
- // Pass the global object as the receiver and let the IC stub
- // patch the stack to use the global proxy as 'this' in the
- // invoked function.
- LoadGlobal();
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- VirtualFrame::SpilledScope spilled_scope(frame_);
- // Setup the name register and call the IC initialization code.
- __ mov(r2, Operand(var->name()));
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> stub =
- ISOLATE->stub_cache()->ComputeCallInitialize(arg_count, in_loop);
- CodeForSourcePosition(node->position());
- frame_->CallCodeObject(stub, RelocInfo::CODE_TARGET_CONTEXT,
- arg_count + 1);
- __ ldr(cp, frame_->Context());
- frame_->EmitPush(r0);
-
- } else if (var != NULL && var->AsSlot() != NULL &&
- var->AsSlot()->type() == Slot::LOOKUP) {
- // ----------------------------------
- // JavaScript examples:
- //
- // with (obj) foo(1, 2, 3) // foo may be in obj.
- //
- // function f() {};
- // function g() {
- // eval(...);
- // f(); // f could be in extension object.
- // }
- // ----------------------------------
-
- JumpTarget slow, done;
-
- // Generate fast case for loading functions from slots that
- // correspond to local/global variables or arguments unless they
- // are shadowed by eval-introduced bindings.
- EmitDynamicLoadFromSlotFastCase(var->AsSlot(),
- NOT_INSIDE_TYPEOF,
- &slow,
- &done);
-
- slow.Bind();
- // Load the function
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(var->name()));
- frame_->CallRuntime(Runtime::kLoadContextSlot, 2);
- // r0: slot value; r1: receiver
-
- // Load the receiver.
- frame_->EmitPush(r0); // function
- frame_->EmitPush(r1); // receiver
-
- // If fast case code has been generated, emit code to push the
- // function and receiver and have the slow path jump around this
- // code.
- if (done.is_linked()) {
- JumpTarget call;
- call.Jump();
- done.Bind();
- frame_->EmitPush(r0); // function
- LoadGlobalReceiver(VirtualFrame::scratch0()); // receiver
- call.Bind();
- }
-
- // Call the function. At this point, everything is spilled but the
- // function and receiver are in r0 and r1.
- CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position());
- frame_->EmitPush(r0);
-
- } else if (property != NULL) {
- // Check if the key is a literal string.
- Literal* literal = property->key()->AsLiteral();
-
- if (literal != NULL && literal->handle()->IsSymbol()) {
- // ------------------------------------------------------------------
- // JavaScript example: 'object.foo(1, 2, 3)' or 'map["key"](1, 2, 3)'
- // ------------------------------------------------------------------
-
- Handle<String> name = Handle<String>::cast(literal->handle());
-
- if (ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION &&
- name->IsEqualTo(CStrVector("apply")) &&
- args->length() == 2 &&
- args->at(1)->AsVariableProxy() != NULL &&
- args->at(1)->AsVariableProxy()->IsArguments()) {
- // Use the optimized Function.prototype.apply that avoids
- // allocating lazily allocated arguments objects.
- CallApplyLazy(property->obj(),
- args->at(0),
- args->at(1)->AsVariableProxy(),
- node->position());
-
- } else {
- Load(property->obj()); // Receiver.
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- VirtualFrame::SpilledScope spilled_scope(frame_);
- // Set the name register and call the IC initialization code.
- __ mov(r2, Operand(name));
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> stub =
- ISOLATE->stub_cache()->ComputeCallInitialize(arg_count, in_loop);
- CodeForSourcePosition(node->position());
- frame_->CallCodeObject(stub, RelocInfo::CODE_TARGET, arg_count + 1);
- __ ldr(cp, frame_->Context());
- frame_->EmitPush(r0);
- }
-
- } else {
- // -------------------------------------------
- // JavaScript example: 'array[index](1, 2, 3)'
- // -------------------------------------------
-
- // Load the receiver and name of the function.
- Load(property->obj());
- Load(property->key());
-
- if (property->is_synthetic()) {
- EmitKeyedLoad();
- // Put the function below the receiver.
- // Use the global receiver.
- frame_->EmitPush(r0); // Function.
- LoadGlobalReceiver(VirtualFrame::scratch0());
- // Call the function.
- CallWithArguments(args, RECEIVER_MIGHT_BE_VALUE, node->position());
- frame_->EmitPush(r0);
- } else {
- // Swap the name of the function and the receiver on the stack to follow
- // the calling convention for call ICs.
- Register key = frame_->PopToRegister();
- Register receiver = frame_->PopToRegister(key);
- frame_->EmitPush(key);
- frame_->EmitPush(receiver);
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- // Load the key into r2 and call the IC initialization code.
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> stub =
- ISOLATE->stub_cache()->ComputeKeyedCallInitialize(arg_count,
- in_loop);
- CodeForSourcePosition(node->position());
- frame_->SpillAll();
- __ ldr(r2, frame_->ElementAt(arg_count + 1));
- frame_->CallCodeObject(stub, RelocInfo::CODE_TARGET, arg_count + 1);
- frame_->Drop(); // Drop the key still on the stack.
- __ ldr(cp, frame_->Context());
- frame_->EmitPush(r0);
- }
- }
-
- } else {
- // ----------------------------------
- // JavaScript example: 'foo(1, 2, 3)' // foo is not global
- // ----------------------------------
-
- // Load the function.
- Load(function);
-
- // Pass the global proxy as the receiver.
- LoadGlobalReceiver(VirtualFrame::scratch0());
-
- // Call the function.
- CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position());
- frame_->EmitPush(r0);
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitCallNew(CallNew* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ CallNew");
-
- // According to ECMA-262, section 11.2.2, page 44, the function
- // expression in new calls must be evaluated before the
- // arguments. This is different from ordinary calls, where the
- // actual function to call is resolved after the arguments have been
- // evaluated.
-
- // Push constructor on the stack. If it's not a function it's used as
- // receiver for CALL_NON_FUNCTION, otherwise the value on the stack is
- // ignored.
- Load(node->expression());
-
- // Push the arguments ("left-to-right") on the stack.
- ZoneList<Expression*>* args = node->arguments();
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- // Spill everything from here to simplify the implementation.
- VirtualFrame::SpilledScope spilled_scope(frame_);
-
- // Load the argument count into r0 and the function into r1 as per
- // calling convention.
- __ mov(r0, Operand(arg_count));
- __ ldr(r1, frame_->ElementAt(arg_count));
-
- // Call the construct call builtin that handles allocation and
- // constructor invocation.
- CodeForSourcePosition(node->position());
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kJSConstructCall));
- frame_->CallCodeObject(ic, RelocInfo::CONSTRUCT_CALL, arg_count + 1);
- frame_->EmitPush(r0);
-
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::GenerateClassOf(ZoneList<Expression*>* args) {
- Register scratch = VirtualFrame::scratch0();
- JumpTarget null, function, leave, non_function_constructor;
-
- // Load the object into register.
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register tos = frame_->PopToRegister();
-
- // If the object is a smi, we return null.
- __ tst(tos, Operand(kSmiTagMask));
- null.Branch(eq);
-
- // Check that the object is a JS object but take special care of JS
- // functions to make sure they have 'Function' as their class.
- __ CompareObjectType(tos, tos, scratch, FIRST_JS_OBJECT_TYPE);
- null.Branch(lt);
-
- // As long as JS_FUNCTION_TYPE is the last instance type and it is
- // right after LAST_JS_OBJECT_TYPE, we can avoid checking for
- // LAST_JS_OBJECT_TYPE.
- STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
- STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
- __ cmp(scratch, Operand(JS_FUNCTION_TYPE));
- function.Branch(eq);
-
- // Check if the constructor in the map is a function.
- __ ldr(tos, FieldMemOperand(tos, Map::kConstructorOffset));
- __ CompareObjectType(tos, scratch, scratch, JS_FUNCTION_TYPE);
- non_function_constructor.Branch(ne);
-
- // The tos register now contains the constructor function. Grab the
- // instance class name from there.
- __ ldr(tos, FieldMemOperand(tos, JSFunction::kSharedFunctionInfoOffset));
- __ ldr(tos,
- FieldMemOperand(tos, SharedFunctionInfo::kInstanceClassNameOffset));
- frame_->EmitPush(tos);
- leave.Jump();
-
- // Functions have class 'Function'.
- function.Bind();
- __ mov(tos, Operand(FACTORY->function_class_symbol()));
- frame_->EmitPush(tos);
- leave.Jump();
-
- // Objects with a non-function constructor have class 'Object'.
- non_function_constructor.Bind();
- __ mov(tos, Operand(FACTORY->Object_symbol()));
- frame_->EmitPush(tos);
- leave.Jump();
-
- // Non-JS objects have class null.
- null.Bind();
- __ LoadRoot(tos, Heap::kNullValueRootIndex);
- frame_->EmitPush(tos);
-
- // All done.
- leave.Bind();
-}
-
-
-void CodeGenerator::GenerateValueOf(ZoneList<Expression*>* args) {
- Register scratch = VirtualFrame::scratch0();
- JumpTarget leave;
-
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register tos = frame_->PopToRegister(); // tos contains object.
- // if (object->IsSmi()) return the object.
- __ tst(tos, Operand(kSmiTagMask));
- leave.Branch(eq);
- // It is a heap object - get map. If (!object->IsJSValue()) return the object.
- __ CompareObjectType(tos, scratch, scratch, JS_VALUE_TYPE);
- leave.Branch(ne);
- // Load the value.
- __ ldr(tos, FieldMemOperand(tos, JSValue::kValueOffset));
- leave.Bind();
- frame_->EmitPush(tos);
-}
-
-
-void CodeGenerator::GenerateSetValueOf(ZoneList<Expression*>* args) {
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- JumpTarget leave;
-
- ASSERT(args->length() == 2);
- Load(args->at(0)); // Load the object.
- Load(args->at(1)); // Load the value.
- Register value = frame_->PopToRegister();
- Register object = frame_->PopToRegister(value);
- // if (object->IsSmi()) return object.
- __ tst(object, Operand(kSmiTagMask));
- leave.Branch(eq);
- // It is a heap object - get map. If (!object->IsJSValue()) return the object.
- __ CompareObjectType(object, scratch1, scratch1, JS_VALUE_TYPE);
- leave.Branch(ne);
- // Store the value.
- __ str(value, FieldMemOperand(object, JSValue::kValueOffset));
- // Update the write barrier.
- __ RecordWrite(object,
- Operand(JSValue::kValueOffset - kHeapObjectTag),
- scratch1,
- scratch2);
- // Leave.
- leave.Bind();
- frame_->EmitPush(value);
-}
-
-
-void CodeGenerator::GenerateIsSmi(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register reg = frame_->PopToRegister();
- __ tst(reg, Operand(kSmiTagMask));
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateLog(ZoneList<Expression*>* args) {
- // See comment in CodeGenerator::GenerateLog in codegen-ia32.cc.
- ASSERT_EQ(args->length(), 3);
-#ifdef ENABLE_LOGGING_AND_PROFILING
- if (ShouldGenerateLog(args->at(0))) {
- Load(args->at(1));
- Load(args->at(2));
- frame_->CallRuntime(Runtime::kLog, 2);
- }
-#endif
- frame_->EmitPushRoot(Heap::kUndefinedValueRootIndex);
-}
-
-
-void CodeGenerator::GenerateIsNonNegativeSmi(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register reg = frame_->PopToRegister();
- __ tst(reg, Operand(kSmiTagMask | 0x80000000u));
- cc_reg_ = eq;
-}
-
-
-// Generates the Math.pow method.
-void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
- Load(args->at(0));
- Load(args->at(1));
-
- if (!CpuFeatures::IsSupported(VFP3)) {
- frame_->CallRuntime(Runtime::kMath_pow, 2);
- frame_->EmitPush(r0);
- } else {
- CpuFeatures::Scope scope(VFP3);
- JumpTarget runtime, done;
- Label exponent_nonsmi, base_nonsmi, powi, not_minus_half, allocate_return;
-
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
-
- // Get base and exponent to registers.
- Register exponent = frame_->PopToRegister();
- Register base = frame_->PopToRegister(exponent);
- Register heap_number_map = no_reg;
-
- // Set the frame for the runtime jump target. The code below jumps to the
- // jump target label so the frame needs to be established before that.
- ASSERT(runtime.entry_frame() == NULL);
- runtime.set_entry_frame(frame_);
-
- __ JumpIfNotSmi(exponent, &exponent_nonsmi);
- __ JumpIfNotSmi(base, &base_nonsmi);
-
- heap_number_map = r6;
- __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-
- // Exponent is a smi and base is a smi. Get the smi value into vfp register
- // d1.
- __ SmiToDoubleVFPRegister(base, d1, scratch1, s0);
- __ b(&powi);
-
- __ bind(&base_nonsmi);
- // Exponent is smi and base is non smi. Get the double value from the base
- // into vfp register d1.
- __ ObjectToDoubleVFPRegister(base, d1,
- scratch1, scratch2, heap_number_map, s0,
- runtime.entry_label());
-
- __ bind(&powi);
-
- // Load 1.0 into d0.
- __ vmov(d0, 1.0);
-
- // Get the absolute untagged value of the exponent and use that for the
- // calculation.
- __ mov(scratch1, Operand(exponent, ASR, kSmiTagSize), SetCC);
- // Negate if negative.
- __ rsb(scratch1, scratch1, Operand(0, RelocInfo::NONE), LeaveCC, mi);
- __ vmov(d2, d0, mi); // 1.0 needed in d2 later if exponent is negative.
-
- // Run through all the bits in the exponent. The result is calculated in d0
- // and d1 holds base^(bit^2).
- Label more_bits;
- __ bind(&more_bits);
- __ mov(scratch1, Operand(scratch1, LSR, 1), SetCC);
- __ vmul(d0, d0, d1, cs); // Multiply with base^(bit^2) if bit is set.
- __ vmul(d1, d1, d1, ne); // Don't bother calculating next d1 if done.
- __ b(ne, &more_bits);
-
- // If exponent is positive we are done.
- __ cmp(exponent, Operand(0, RelocInfo::NONE));
- __ b(ge, &allocate_return);
-
- // If exponent is negative result is 1/result (d2 already holds 1.0 in that
- // case). However if d0 has reached infinity this will not provide the
- // correct result, so call runtime if that is the case.
- __ mov(scratch2, Operand(0x7FF00000));
- __ mov(scratch1, Operand(0, RelocInfo::NONE));
- __ vmov(d1, scratch1, scratch2); // Load infinity into d1.
- __ VFPCompareAndSetFlags(d0, d1);
- runtime.Branch(eq); // d0 reached infinity.
- __ vdiv(d0, d2, d0);
- __ b(&allocate_return);
-
- __ bind(&exponent_nonsmi);
- // Special handling of raising to the power of -0.5 and 0.5. First check
- // that the value is a heap number and that the lower bits (which for both
- // values are zero).
- heap_number_map = r6;
- __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
- __ ldr(scratch1, FieldMemOperand(exponent, HeapObject::kMapOffset));
- __ ldr(scratch2, FieldMemOperand(exponent, HeapNumber::kMantissaOffset));
- __ cmp(scratch1, heap_number_map);
- runtime.Branch(ne);
- __ tst(scratch2, scratch2);
- runtime.Branch(ne);
-
- // Load the higher bits (which contains the floating point exponent).
- __ ldr(scratch1, FieldMemOperand(exponent, HeapNumber::kExponentOffset));
-
- // Compare exponent with -0.5.
- __ cmp(scratch1, Operand(0xbfe00000));
- __ b(ne, ¬_minus_half);
-
- // Get the double value from the base into vfp register d0.
- __ ObjectToDoubleVFPRegister(base, d0,
- scratch1, scratch2, heap_number_map, s0,
- runtime.entry_label(),
- AVOID_NANS_AND_INFINITIES);
-
- // Convert -0 into +0 by adding +0.
- __ vmov(d2, 0.0);
- __ vadd(d0, d2, d0);
- // Load 1.0 into d2.
- __ vmov(d2, 1.0);
-
- // Calculate the reciprocal of the square root.
- __ vsqrt(d0, d0);
- __ vdiv(d0, d2, d0);
-
- __ b(&allocate_return);
-
- __ bind(¬_minus_half);
- // Compare exponent with 0.5.
- __ cmp(scratch1, Operand(0x3fe00000));
- runtime.Branch(ne);
-
- // Get the double value from the base into vfp register d0.
- __ ObjectToDoubleVFPRegister(base, d0,
- scratch1, scratch2, heap_number_map, s0,
- runtime.entry_label(),
- AVOID_NANS_AND_INFINITIES);
- // Convert -0 into +0 by adding +0.
- __ vmov(d2, 0.0);
- __ vadd(d0, d2, d0);
- __ vsqrt(d0, d0);
-
- __ bind(&allocate_return);
- Register scratch3 = r5;
- __ AllocateHeapNumberWithValue(scratch3, d0, scratch1, scratch2,
- heap_number_map, runtime.entry_label());
- __ mov(base, scratch3);
- done.Jump();
-
- runtime.Bind();
-
- // Push back the arguments again for the runtime call.
- frame_->EmitPush(base);
- frame_->EmitPush(exponent);
- frame_->CallRuntime(Runtime::kMath_pow, 2);
- __ Move(base, r0);
-
- done.Bind();
- frame_->EmitPush(base);
- }
-}
-
-
-// Generates the Math.sqrt method.
-void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
-
- if (!CpuFeatures::IsSupported(VFP3)) {
- frame_->CallRuntime(Runtime::kMath_sqrt, 1);
- frame_->EmitPush(r0);
- } else {
- CpuFeatures::Scope scope(VFP3);
- JumpTarget runtime, done;
-
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
-
- // Get the value from the frame.
- Register tos = frame_->PopToRegister();
-
- // Set the frame for the runtime jump target. The code below jumps to the
- // jump target label so the frame needs to be established before that.
- ASSERT(runtime.entry_frame() == NULL);
- runtime.set_entry_frame(frame_);
-
- Register heap_number_map = r6;
- Register new_heap_number = r5;
- __ LoadRoot(heap_number_map, Heap::kHeapNumberMapRootIndex);
-
- // Get the double value from the heap number into vfp register d0.
- __ ObjectToDoubleVFPRegister(tos, d0,
- scratch1, scratch2, heap_number_map, s0,
- runtime.entry_label());
-
- // Calculate the square root of d0 and place result in a heap number object.
- __ vsqrt(d0, d0);
- __ AllocateHeapNumberWithValue(new_heap_number,
- d0,
- scratch1, scratch2,
- heap_number_map,
- runtime.entry_label());
- __ mov(tos, Operand(new_heap_number));
- done.Jump();
-
- runtime.Bind();
- // Push back the argument again for the runtime call.
- frame_->EmitPush(tos);
- frame_->CallRuntime(Runtime::kMath_sqrt, 1);
- __ Move(tos, r0);
-
- done.Bind();
- frame_->EmitPush(tos);
- }
-}
-
-
-class DeferredStringCharCodeAt : public DeferredCode {
- public:
- DeferredStringCharCodeAt(Register object,
- Register index,
- Register scratch,
- Register result)
- : result_(result),
- char_code_at_generator_(object,
- index,
- scratch,
- result,
- &need_conversion_,
- &need_conversion_,
- &index_out_of_range_,
- STRING_INDEX_IS_NUMBER) {}
-
- StringCharCodeAtGenerator* fast_case_generator() {
- return &char_code_at_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_code_at_generator_.GenerateSlow(masm(), call_helper);
-
- __ bind(&need_conversion_);
- // Move the undefined value into the result register, which will
- // trigger conversion.
- __ LoadRoot(result_, Heap::kUndefinedValueRootIndex);
- __ jmp(exit_label());
-
- __ bind(&index_out_of_range_);
- // When the index is out of range, the spec requires us to return
- // NaN.
- __ LoadRoot(result_, Heap::kNanValueRootIndex);
- __ jmp(exit_label());
- }
-
- private:
- Register result_;
-
- Label need_conversion_;
- Label index_out_of_range_;
-
- StringCharCodeAtGenerator char_code_at_generator_;
-};
-
-
-// This generates code that performs a String.prototype.charCodeAt() call
-// or returns a smi in order to trigger conversion.
-void CodeGenerator::GenerateStringCharCodeAt(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharCodeAt");
- ASSERT(args->length() == 2);
-
- Load(args->at(0));
- Load(args->at(1));
-
- Register index = frame_->PopToRegister();
- Register object = frame_->PopToRegister(index);
-
- // We need two extra registers.
- Register scratch = VirtualFrame::scratch0();
- Register result = VirtualFrame::scratch1();
-
- DeferredStringCharCodeAt* deferred =
- new DeferredStringCharCodeAt(object,
- index,
- scratch,
- result);
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->EmitPush(result);
-}
-
-
-class DeferredStringCharFromCode : public DeferredCode {
- public:
- DeferredStringCharFromCode(Register code,
- Register result)
- : char_from_code_generator_(code, result) {}
-
- StringCharFromCodeGenerator* fast_case_generator() {
- return &char_from_code_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_from_code_generator_.GenerateSlow(masm(), call_helper);
- }
-
- private:
- StringCharFromCodeGenerator char_from_code_generator_;
-};
-
-
-// Generates code for creating a one-char string from a char code.
-void CodeGenerator::GenerateStringCharFromCode(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharFromCode");
- ASSERT(args->length() == 1);
-
- Load(args->at(0));
-
- Register result = frame_->GetTOSRegister();
- Register code = frame_->PopToRegister(result);
-
- DeferredStringCharFromCode* deferred = new DeferredStringCharFromCode(
- code, result);
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->EmitPush(result);
-}
-
-
-class DeferredStringCharAt : public DeferredCode {
- public:
- DeferredStringCharAt(Register object,
- Register index,
- Register scratch1,
- Register scratch2,
- Register result)
- : result_(result),
- char_at_generator_(object,
- index,
- scratch1,
- scratch2,
- result,
- &need_conversion_,
- &need_conversion_,
- &index_out_of_range_,
- STRING_INDEX_IS_NUMBER) {}
-
- StringCharAtGenerator* fast_case_generator() {
- return &char_at_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_at_generator_.GenerateSlow(masm(), call_helper);
-
- __ bind(&need_conversion_);
- // Move smi zero into the result register, which will trigger
- // conversion.
- __ mov(result_, Operand(Smi::FromInt(0)));
- __ jmp(exit_label());
-
- __ bind(&index_out_of_range_);
- // When the index is out of range, the spec requires us to return
- // the empty string.
- __ LoadRoot(result_, Heap::kEmptyStringRootIndex);
- __ jmp(exit_label());
- }
-
- private:
- Register result_;
-
- Label need_conversion_;
- Label index_out_of_range_;
-
- StringCharAtGenerator char_at_generator_;
-};
-
-
-// This generates code that performs a String.prototype.charAt() call
-// or returns a smi in order to trigger conversion.
-void CodeGenerator::GenerateStringCharAt(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharAt");
- ASSERT(args->length() == 2);
-
- Load(args->at(0));
- Load(args->at(1));
-
- Register index = frame_->PopToRegister();
- Register object = frame_->PopToRegister(index);
-
- // We need three extra registers.
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- // Use r6 without notifying the virtual frame.
- Register result = r6;
-
- DeferredStringCharAt* deferred =
- new DeferredStringCharAt(object,
- index,
- scratch1,
- scratch2,
- result);
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->EmitPush(result);
-}
-
-
-void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- JumpTarget answer;
- // We need the CC bits to come out as not_equal in the case where the
- // object is a smi. This can't be done with the usual test opcode so
- // we use XOR to get the right CC bits.
- Register possible_array = frame_->PopToRegister();
- Register scratch = VirtualFrame::scratch0();
- __ and_(scratch, possible_array, Operand(kSmiTagMask));
- __ eor(scratch, scratch, Operand(kSmiTagMask), SetCC);
- answer.Branch(ne);
- // It is a heap object - get the map. Check if the object is a JS array.
- __ CompareObjectType(possible_array, scratch, scratch, JS_ARRAY_TYPE);
- answer.Bind();
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateIsRegExp(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- JumpTarget answer;
- // We need the CC bits to come out as not_equal in the case where the
- // object is a smi. This can't be done with the usual test opcode so
- // we use XOR to get the right CC bits.
- Register possible_regexp = frame_->PopToRegister();
- Register scratch = VirtualFrame::scratch0();
- __ and_(scratch, possible_regexp, Operand(kSmiTagMask));
- __ eor(scratch, scratch, Operand(kSmiTagMask), SetCC);
- answer.Branch(ne);
- // It is a heap object - get the map. Check if the object is a regexp.
- __ CompareObjectType(possible_regexp, scratch, scratch, JS_REGEXP_TYPE);
- answer.Bind();
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp')
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register possible_object = frame_->PopToRegister();
- __ tst(possible_object, Operand(kSmiTagMask));
- false_target()->Branch(eq);
-
- __ LoadRoot(ip, Heap::kNullValueRootIndex);
- __ cmp(possible_object, ip);
- true_target()->Branch(eq);
-
- Register map_reg = VirtualFrame::scratch0();
- __ ldr(map_reg, FieldMemOperand(possible_object, HeapObject::kMapOffset));
- // Undetectable objects behave like undefined when tested with typeof.
- __ ldrb(possible_object, FieldMemOperand(map_reg, Map::kBitFieldOffset));
- __ tst(possible_object, Operand(1 << Map::kIsUndetectable));
- false_target()->Branch(ne);
-
- __ ldrb(possible_object, FieldMemOperand(map_reg, Map::kInstanceTypeOffset));
- __ cmp(possible_object, Operand(FIRST_JS_OBJECT_TYPE));
- false_target()->Branch(lt);
- __ cmp(possible_object, Operand(LAST_JS_OBJECT_TYPE));
- cc_reg_ = le;
-}
-
-
-void CodeGenerator::GenerateIsSpecObject(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp' ||
- // typeof(arg) == function).
- // It includes undetectable objects (as opposed to IsObject).
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register value = frame_->PopToRegister();
- __ tst(value, Operand(kSmiTagMask));
- false_target()->Branch(eq);
- // Check that this is an object.
- __ ldr(value, FieldMemOperand(value, HeapObject::kMapOffset));
- __ ldrb(value, FieldMemOperand(value, Map::kInstanceTypeOffset));
- __ cmp(value, Operand(FIRST_JS_OBJECT_TYPE));
- cc_reg_ = ge;
-}
-
-
-// Deferred code to check whether the String JavaScript object is safe for using
-// default value of. This code is called after the bit caching this information
-// in the map has been checked with the map for the object in the map_result_
-// register. On return the register map_result_ contains 1 for true and 0 for
-// false.
-class DeferredIsStringWrapperSafeForDefaultValueOf : public DeferredCode {
- public:
- DeferredIsStringWrapperSafeForDefaultValueOf(Register object,
- Register map_result,
- Register scratch1,
- Register scratch2)
- : object_(object),
- map_result_(map_result),
- scratch1_(scratch1),
- scratch2_(scratch2) { }
-
- virtual void Generate() {
- Label false_result;
-
- // Check that map is loaded as expected.
- if (FLAG_debug_code) {
- __ ldr(ip, FieldMemOperand(object_, HeapObject::kMapOffset));
- __ cmp(map_result_, ip);
- __ Assert(eq, "Map not in expected register");
- }
-
- // Check for fast case object. Generate false result for slow case object.
- __ ldr(scratch1_, FieldMemOperand(object_, JSObject::kPropertiesOffset));
- __ ldr(scratch1_, FieldMemOperand(scratch1_, HeapObject::kMapOffset));
- __ LoadRoot(ip, Heap::kHashTableMapRootIndex);
- __ cmp(scratch1_, ip);
- __ b(eq, &false_result);
-
- // Look for valueOf symbol in the descriptor array, and indicate false if
- // found. The type is not checked, so if it is a transition it is a false
- // negative.
- __ ldr(map_result_,
- FieldMemOperand(map_result_, Map::kInstanceDescriptorsOffset));
- __ ldr(scratch2_, FieldMemOperand(map_result_, FixedArray::kLengthOffset));
- // map_result_: descriptor array
- // scratch2_: length of descriptor array
- // Calculate the end of the descriptor array.
- STATIC_ASSERT(kSmiTag == 0);
- STATIC_ASSERT(kSmiTagSize == 1);
- STATIC_ASSERT(kPointerSize == 4);
- __ add(scratch1_,
- map_result_,
- Operand(FixedArray::kHeaderSize - kHeapObjectTag));
- __ add(scratch1_,
- scratch1_,
- Operand(scratch2_, LSL, kPointerSizeLog2 - kSmiTagSize));
-
- // Calculate location of the first key name.
- __ add(map_result_,
- map_result_,
- Operand(FixedArray::kHeaderSize - kHeapObjectTag +
- DescriptorArray::kFirstIndex * kPointerSize));
- // Loop through all the keys in the descriptor array. If one of these is the
- // symbol valueOf the result is false.
- Label entry, loop;
- // The use of ip to store the valueOf symbol asumes that it is not otherwise
- // used in the loop below.
- __ mov(ip, Operand(FACTORY->value_of_symbol()));
- __ jmp(&entry);
- __ bind(&loop);
- __ ldr(scratch2_, MemOperand(map_result_, 0));
- __ cmp(scratch2_, ip);
- __ b(eq, &false_result);
- __ add(map_result_, map_result_, Operand(kPointerSize));
- __ bind(&entry);
- __ cmp(map_result_, Operand(scratch1_));
- __ b(ne, &loop);
-
- // Reload map as register map_result_ was used as temporary above.
- __ ldr(map_result_, FieldMemOperand(object_, HeapObject::kMapOffset));
-
- // If a valueOf property is not found on the object check that it's
- // prototype is the un-modified String prototype. If not result is false.
- __ ldr(scratch1_, FieldMemOperand(map_result_, Map::kPrototypeOffset));
- __ tst(scratch1_, Operand(kSmiTagMask));
- __ b(eq, &false_result);
- __ ldr(scratch1_, FieldMemOperand(scratch1_, HeapObject::kMapOffset));
- __ ldr(scratch2_,
- ContextOperand(cp, Context::GLOBAL_INDEX));
- __ ldr(scratch2_,
- FieldMemOperand(scratch2_, GlobalObject::kGlobalContextOffset));
- __ ldr(scratch2_,
- ContextOperand(
- scratch2_, Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX));
- __ cmp(scratch1_, scratch2_);
- __ b(ne, &false_result);
-
- // Set the bit in the map to indicate that it has been checked safe for
- // default valueOf and set true result.
- __ ldrb(scratch1_, FieldMemOperand(map_result_, Map::kBitField2Offset));
- __ orr(scratch1_,
- scratch1_,
- Operand(1 << Map::kStringWrapperSafeForDefaultValueOf));
- __ strb(scratch1_, FieldMemOperand(map_result_, Map::kBitField2Offset));
- __ mov(map_result_, Operand(1));
- __ jmp(exit_label());
- __ bind(&false_result);
- // Set false result.
- __ mov(map_result_, Operand(0, RelocInfo::NONE));
- }
-
- private:
- Register object_;
- Register map_result_;
- Register scratch1_;
- Register scratch2_;
-};
-
-
-void CodeGenerator::GenerateIsStringWrapperSafeForDefaultValueOf(
- ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register obj = frame_->PopToRegister(); // Pop the string wrapper.
- if (FLAG_debug_code) {
- __ AbortIfSmi(obj);
- }
-
- // Check whether this map has already been checked to be safe for default
- // valueOf.
- Register map_result = VirtualFrame::scratch0();
- __ ldr(map_result, FieldMemOperand(obj, HeapObject::kMapOffset));
- __ ldrb(ip, FieldMemOperand(map_result, Map::kBitField2Offset));
- __ tst(ip, Operand(1 << Map::kStringWrapperSafeForDefaultValueOf));
- true_target()->Branch(ne);
-
- // We need an additional two scratch registers for the deferred code.
- Register scratch1 = VirtualFrame::scratch1();
- // Use r6 without notifying the virtual frame.
- Register scratch2 = r6;
-
- DeferredIsStringWrapperSafeForDefaultValueOf* deferred =
- new DeferredIsStringWrapperSafeForDefaultValueOf(
- obj, map_result, scratch1, scratch2);
- deferred->Branch(eq);
- deferred->BindExit();
- __ tst(map_result, Operand(map_result));
- cc_reg_ = ne;
-}
-
-
-void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (%_ClassOf(arg) === 'Function')
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register possible_function = frame_->PopToRegister();
- __ tst(possible_function, Operand(kSmiTagMask));
- false_target()->Branch(eq);
- Register map_reg = VirtualFrame::scratch0();
- Register scratch = VirtualFrame::scratch1();
- __ CompareObjectType(possible_function, map_reg, scratch, JS_FUNCTION_TYPE);
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateIsUndetectableObject(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register possible_undetectable = frame_->PopToRegister();
- __ tst(possible_undetectable, Operand(kSmiTagMask));
- false_target()->Branch(eq);
- Register scratch = VirtualFrame::scratch0();
- __ ldr(scratch,
- FieldMemOperand(possible_undetectable, HeapObject::kMapOffset));
- __ ldrb(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
- __ tst(scratch, Operand(1 << Map::kIsUndetectable));
- cc_reg_ = ne;
-}
-
-
-void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
-
- Register scratch0 = VirtualFrame::scratch0();
- Register scratch1 = VirtualFrame::scratch1();
- // Get the frame pointer for the calling frame.
- __ ldr(scratch0, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-
- // Skip the arguments adaptor frame if it exists.
- __ ldr(scratch1,
- MemOperand(scratch0, StandardFrameConstants::kContextOffset));
- __ cmp(scratch1, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
- __ ldr(scratch0,
- MemOperand(scratch0, StandardFrameConstants::kCallerFPOffset), eq);
-
- // Check the marker in the calling frame.
- __ ldr(scratch1,
- MemOperand(scratch0, StandardFrameConstants::kMarkerOffset));
- __ cmp(scratch1, Operand(Smi::FromInt(StackFrame::CONSTRUCT)));
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
-
- Register tos = frame_->GetTOSRegister();
- Register scratch0 = VirtualFrame::scratch0();
- Register scratch1 = VirtualFrame::scratch1();
-
- // Check if the calling frame is an arguments adaptor frame.
- __ ldr(scratch0,
- MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
- __ ldr(scratch1,
- MemOperand(scratch0, StandardFrameConstants::kContextOffset));
- __ cmp(scratch1, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-
- // Get the number of formal parameters.
- __ mov(tos, Operand(Smi::FromInt(scope()->num_parameters())), LeaveCC, ne);
-
- // Arguments adaptor case: Read the arguments length from the
- // adaptor frame.
- __ ldr(tos,
- MemOperand(scratch0, ArgumentsAdaptorFrameConstants::kLengthOffset),
- eq);
-
- frame_->EmitPush(tos);
-}
-
-
-void CodeGenerator::GenerateArguments(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
-
- // Satisfy contract with ArgumentsAccessStub:
- // Load the key into r1 and the formal parameters count into r0.
- Load(args->at(0));
- frame_->PopToR1();
- frame_->SpillAll();
- __ mov(r0, Operand(Smi::FromInt(scope()->num_parameters())));
-
- // Call the shared stub to get to arguments[key].
- ArgumentsAccessStub stub(ArgumentsAccessStub::READ_ELEMENT);
- frame_->CallStub(&stub, 0);
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateRandomHeapNumber(
- ZoneList<Expression*>* args) {
- VirtualFrame::SpilledScope spilled_scope(frame_);
- ASSERT(args->length() == 0);
-
- Label slow_allocate_heapnumber;
- Label heapnumber_allocated;
-
- __ LoadRoot(r6, Heap::kHeapNumberMapRootIndex);
- __ AllocateHeapNumber(r4, r1, r2, r6, &slow_allocate_heapnumber);
- __ jmp(&heapnumber_allocated);
-
- __ bind(&slow_allocate_heapnumber);
- // Allocate a heap number.
- __ CallRuntime(Runtime::kNumberAlloc, 0);
- __ mov(r4, Operand(r0));
-
- __ bind(&heapnumber_allocated);
-
- // Convert 32 random bits in r0 to 0.(32 random bits) in a double
- // by computing:
- // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
- if (CpuFeatures::IsSupported(VFP3)) {
- __ PrepareCallCFunction(1, r0);
- __ mov(r0, Operand(ExternalReference::isolate_address()));
- __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
-
- CpuFeatures::Scope scope(VFP3);
- // 0x41300000 is the top half of 1.0 x 2^20 as a double.
- // Create this constant using mov/orr to avoid PC relative load.
- __ mov(r1, Operand(0x41000000));
- __ orr(r1, r1, Operand(0x300000));
- // Move 0x41300000xxxxxxxx (x = random bits) to VFP.
- __ vmov(d7, r0, r1);
- // Move 0x4130000000000000 to VFP.
- __ mov(r0, Operand(0, RelocInfo::NONE));
- __ vmov(d8, r0, r1);
- // Subtract and store the result in the heap number.
- __ vsub(d7, d7, d8);
- __ sub(r0, r4, Operand(kHeapObjectTag));
- __ vstr(d7, r0, HeapNumber::kValueOffset);
- frame_->EmitPush(r4);
- } else {
- __ PrepareCallCFunction(2, r0);
- __ mov(r0, Operand(r4));
- __ mov(r1, Operand(ExternalReference::isolate_address()));
- __ CallCFunction(
- ExternalReference::fill_heap_number_with_random_function(isolate()), 2);
- frame_->EmitPush(r0);
- }
-}
-
-
-void CodeGenerator::GenerateStringAdd(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
-
- StringAddStub stub(NO_STRING_ADD_FLAGS);
- frame_->SpillAll();
- frame_->CallStub(&stub, 2);
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateSubString(ZoneList<Expression*>* args) {
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
-
- SubStringStub stub;
- frame_->SpillAll();
- frame_->CallStub(&stub, 3);
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateStringCompare(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
-
- StringCompareStub stub;
- frame_->SpillAll();
- frame_->CallStub(&stub, 2);
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) {
- ASSERT_EQ(4, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
- Load(args->at(3));
- RegExpExecStub stub;
- frame_->SpillAll();
- frame_->CallStub(&stub, 4);
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateRegExpConstructResult(ZoneList<Expression*>* args) {
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0)); // Size of array, smi.
- Load(args->at(1)); // "index" property value.
- Load(args->at(2)); // "input" property value.
- RegExpConstructResultStub stub;
- frame_->SpillAll();
- frame_->CallStub(&stub, 3);
- frame_->EmitPush(r0);
-}
-
-
-class DeferredSearchCache: public DeferredCode {
- public:
- DeferredSearchCache(Register dst, Register cache, Register key)
- : dst_(dst), cache_(cache), key_(key) {
- set_comment("[ DeferredSearchCache");
- }
-
- virtual void Generate();
-
- private:
- Register dst_, cache_, key_;
-};
-
-
-void DeferredSearchCache::Generate() {
- __ Push(cache_, key_);
- __ CallRuntime(Runtime::kGetFromCache, 2);
- __ Move(dst_, r0);
-}
-
-
-void CodeGenerator::GenerateGetFromCache(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- ASSERT_NE(NULL, args->at(0)->AsLiteral());
- int cache_id = Smi::cast(*(args->at(0)->AsLiteral()->handle()))->value();
-
- Handle<FixedArray> jsfunction_result_caches(
- Isolate::Current()->global_context()->jsfunction_result_caches());
- if (jsfunction_result_caches->length() <= cache_id) {
- __ Abort("Attempt to use undefined cache.");
- frame_->EmitPushRoot(Heap::kUndefinedValueRootIndex);
- return;
- }
-
- Load(args->at(1));
-
- frame_->PopToR1();
- frame_->SpillAll();
- Register key = r1; // Just poped to r1
- Register result = r0; // Free, as frame has just been spilled.
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
-
- __ ldr(scratch1, ContextOperand(cp, Context::GLOBAL_INDEX));
- __ ldr(scratch1,
- FieldMemOperand(scratch1, GlobalObject::kGlobalContextOffset));
- __ ldr(scratch1,
- ContextOperand(scratch1, Context::JSFUNCTION_RESULT_CACHES_INDEX));
- __ ldr(scratch1,
- FieldMemOperand(scratch1, FixedArray::OffsetOfElementAt(cache_id)));
-
- DeferredSearchCache* deferred =
- new DeferredSearchCache(result, scratch1, key);
-
- const int kFingerOffset =
- FixedArray::OffsetOfElementAt(JSFunctionResultCache::kFingerIndex);
- STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
- __ ldr(result, FieldMemOperand(scratch1, kFingerOffset));
- // result now holds finger offset as a smi.
- __ add(scratch2, scratch1, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
- // scratch2 now points to the start of fixed array elements.
- __ ldr(result,
- MemOperand(
- scratch2, result, LSL, kPointerSizeLog2 - kSmiTagSize, PreIndex));
- // Note side effect of PreIndex: scratch2 now points to the key of the pair.
- __ cmp(key, result);
- deferred->Branch(ne);
-
- __ ldr(result, MemOperand(scratch2, kPointerSize));
-
- deferred->BindExit();
- frame_->EmitPush(result);
-}
-
-
-void CodeGenerator::GenerateNumberToString(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
-
- // Load the argument on the stack and jump to the runtime.
- Load(args->at(0));
-
- NumberToStringStub stub;
- frame_->SpillAll();
- frame_->CallStub(&stub, 1);
- frame_->EmitPush(r0);
-}
-
-
-class DeferredSwapElements: public DeferredCode {
- public:
- DeferredSwapElements(Register object, Register index1, Register index2)
- : object_(object), index1_(index1), index2_(index2) {
- set_comment("[ DeferredSwapElements");
- }
-
- virtual void Generate();
-
- private:
- Register object_, index1_, index2_;
-};
-
-
-void DeferredSwapElements::Generate() {
- __ push(object_);
- __ push(index1_);
- __ push(index2_);
- __ CallRuntime(Runtime::kSwapElements, 3);
-}
-
-
-void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
- Comment cmnt(masm_, "[ GenerateSwapElements");
-
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
-
- VirtualFrame::SpilledScope spilled_scope(frame_);
-
- Register index2 = r2;
- Register index1 = r1;
- Register object = r0;
- Register tmp1 = r3;
- Register tmp2 = r4;
-
- frame_->EmitPop(index2);
- frame_->EmitPop(index1);
- frame_->EmitPop(object);
-
- DeferredSwapElements* deferred =
- new DeferredSwapElements(object, index1, index2);
-
- // Fetch the map and check if array is in fast case.
- // Check that object doesn't require security checks and
- // has no indexed interceptor.
- __ CompareObjectType(object, tmp1, tmp2, JS_ARRAY_TYPE);
- deferred->Branch(ne);
- __ ldrb(tmp2, FieldMemOperand(tmp1, Map::kBitFieldOffset));
- __ tst(tmp2, Operand(KeyedLoadIC::kSlowCaseBitFieldMask));
- deferred->Branch(ne);
-
- // Check the object's elements are in fast case and writable.
- __ ldr(tmp1, FieldMemOperand(object, JSObject::kElementsOffset));
- __ ldr(tmp2, FieldMemOperand(tmp1, HeapObject::kMapOffset));
- __ LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
- __ cmp(tmp2, ip);
- deferred->Branch(ne);
-
- // Smi-tagging is equivalent to multiplying by 2.
- STATIC_ASSERT(kSmiTag == 0);
- STATIC_ASSERT(kSmiTagSize == 1);
-
- // Check that both indices are smis.
- __ mov(tmp2, index1);
- __ orr(tmp2, tmp2, index2);
- __ tst(tmp2, Operand(kSmiTagMask));
- deferred->Branch(ne);
-
- // Check that both indices are valid.
- __ ldr(tmp2, FieldMemOperand(object, JSArray::kLengthOffset));
- __ cmp(tmp2, index1);
- __ cmp(tmp2, index2, hi);
- deferred->Branch(ls);
-
- // Bring the offsets into the fixed array in tmp1 into index1 and
- // index2.
- __ mov(tmp2, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
- __ add(index1, tmp2, Operand(index1, LSL, kPointerSizeLog2 - kSmiTagSize));
- __ add(index2, tmp2, Operand(index2, LSL, kPointerSizeLog2 - kSmiTagSize));
-
- // Swap elements.
- Register tmp3 = object;
- object = no_reg;
- __ ldr(tmp3, MemOperand(tmp1, index1));
- __ ldr(tmp2, MemOperand(tmp1, index2));
- __ str(tmp3, MemOperand(tmp1, index2));
- __ str(tmp2, MemOperand(tmp1, index1));
-
- Label done;
- __ InNewSpace(tmp1, tmp2, eq, &done);
- // Possible optimization: do a check that both values are Smis
- // (or them and test against Smi mask.)
-
- __ mov(tmp2, tmp1);
- __ add(index1, index1, tmp1);
- __ add(index2, index2, tmp1);
- __ RecordWriteHelper(tmp1, index1, tmp3);
- __ RecordWriteHelper(tmp2, index2, tmp3);
- __ bind(&done);
-
- deferred->BindExit();
- __ LoadRoot(tmp1, Heap::kUndefinedValueRootIndex);
- frame_->EmitPush(tmp1);
-}
-
-
-void CodeGenerator::GenerateCallFunction(ZoneList<Expression*>* args) {
- Comment cmnt(masm_, "[ GenerateCallFunction");
-
- ASSERT(args->length() >= 2);
-
- int n_args = args->length() - 2; // for receiver and function.
- Load(args->at(0)); // receiver
- for (int i = 0; i < n_args; i++) {
- Load(args->at(i + 1));
- }
- Load(args->at(n_args + 1)); // function
- frame_->CallJSFunction(n_args);
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- if (CpuFeatures::IsSupported(VFP3)) {
- TranscendentalCacheStub stub(TranscendentalCache::SIN,
- TranscendentalCacheStub::TAGGED);
- frame_->SpillAllButCopyTOSToR0();
- frame_->CallStub(&stub, 1);
- } else {
- frame_->CallRuntime(Runtime::kMath_sin, 1);
- }
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- if (CpuFeatures::IsSupported(VFP3)) {
- TranscendentalCacheStub stub(TranscendentalCache::COS,
- TranscendentalCacheStub::TAGGED);
- frame_->SpillAllButCopyTOSToR0();
- frame_->CallStub(&stub, 1);
- } else {
- frame_->CallRuntime(Runtime::kMath_cos, 1);
- }
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateMathLog(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- if (CpuFeatures::IsSupported(VFP3)) {
- TranscendentalCacheStub stub(TranscendentalCache::LOG,
- TranscendentalCacheStub::TAGGED);
- frame_->SpillAllButCopyTOSToR0();
- frame_->CallStub(&stub, 1);
- } else {
- frame_->CallRuntime(Runtime::kMath_log, 1);
- }
- frame_->EmitPush(r0);
-}
-
-
-void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
-
- // Load the two objects into registers and perform the comparison.
- Load(args->at(0));
- Load(args->at(1));
- Register lhs = frame_->PopToRegister();
- Register rhs = frame_->PopToRegister(lhs);
- __ cmp(lhs, rhs);
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateIsRegExpEquivalent(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
-
- // Load the two objects into registers and perform the comparison.
- Load(args->at(0));
- Load(args->at(1));
- Register right = frame_->PopToRegister();
- Register left = frame_->PopToRegister(right);
- Register tmp = frame_->scratch0();
- Register tmp2 = frame_->scratch1();
-
- // Jumps to done must have the eq flag set if the test is successful
- // and clear if the test has failed.
- Label done;
-
- // Fail if either is a non-HeapObject.
- __ cmp(left, Operand(right));
- __ b(eq, &done);
- __ and_(tmp, left, Operand(right));
- __ eor(tmp, tmp, Operand(kSmiTagMask));
- __ tst(tmp, Operand(kSmiTagMask));
- __ b(ne, &done);
- __ ldr(tmp, FieldMemOperand(left, HeapObject::kMapOffset));
- __ ldrb(tmp2, FieldMemOperand(tmp, Map::kInstanceTypeOffset));
- __ cmp(tmp2, Operand(JS_REGEXP_TYPE));
- __ b(ne, &done);
- __ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
- __ cmp(tmp, Operand(tmp2));
- __ b(ne, &done);
- __ ldr(tmp, FieldMemOperand(left, JSRegExp::kDataOffset));
- __ ldr(tmp2, FieldMemOperand(right, JSRegExp::kDataOffset));
- __ cmp(tmp, tmp2);
- __ bind(&done);
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateHasCachedArrayIndex(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register value = frame_->PopToRegister();
- Register tmp = frame_->scratch0();
- __ ldr(tmp, FieldMemOperand(value, String::kHashFieldOffset));
- __ tst(tmp, Operand(String::kContainsCachedArrayIndexMask));
- cc_reg_ = eq;
-}
-
-
-void CodeGenerator::GenerateGetCachedArrayIndex(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Register value = frame_->PopToRegister();
-
- __ ldr(value, FieldMemOperand(value, String::kHashFieldOffset));
- __ IndexFromHash(value, value);
- frame_->EmitPush(value);
-}
-
-
-void CodeGenerator::GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
- Load(args->at(0));
- Register value = frame_->PopToRegister();
- __ LoadRoot(value, Heap::kUndefinedValueRootIndex);
- frame_->EmitPush(value);
-}
-
-
-void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- if (CheckForInlineRuntimeCall(node)) {
- ASSERT((has_cc() && frame_->height() == original_height) ||
- (!has_cc() && frame_->height() == original_height + 1));
- return;
- }
-
- ZoneList<Expression*>* args = node->arguments();
- Comment cmnt(masm_, "[ CallRuntime");
- const Runtime::Function* function = node->function();
-
- if (function == NULL) {
- // Prepare stack for calling JS runtime function.
- // Push the builtins object found in the current global object.
- Register scratch = VirtualFrame::scratch0();
- __ ldr(scratch, GlobalObjectOperand());
- Register builtins = frame_->GetTOSRegister();
- __ ldr(builtins, FieldMemOperand(scratch, GlobalObject::kBuiltinsOffset));
- frame_->EmitPush(builtins);
- }
-
- // Push the arguments ("left-to-right").
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- VirtualFrame::SpilledScope spilled_scope(frame_);
-
- if (function == NULL) {
- // Call the JS runtime function.
- __ mov(r2, Operand(node->name()));
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> stub =
- ISOLATE->stub_cache()->ComputeCallInitialize(arg_count, in_loop);
- frame_->CallCodeObject(stub, RelocInfo::CODE_TARGET, arg_count + 1);
- __ ldr(cp, frame_->Context());
- frame_->EmitPush(r0);
- } else {
- // Call the C runtime function.
- frame_->CallRuntime(function, arg_count);
- frame_->EmitPush(r0);
- }
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitUnaryOperation(UnaryOperation* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ UnaryOperation");
-
- Token::Value op = node->op();
-
- if (op == Token::NOT) {
- LoadCondition(node->expression(), false_target(), true_target(), true);
- // LoadCondition may (and usually does) leave a test and branch to
- // be emitted by the caller. In that case, negate the condition.
- if (has_cc()) cc_reg_ = NegateCondition(cc_reg_);
-
- } else if (op == Token::DELETE) {
- Property* property = node->expression()->AsProperty();
- Variable* variable = node->expression()->AsVariableProxy()->AsVariable();
- if (property != NULL) {
- Load(property->obj());
- Load(property->key());
- frame_->EmitPush(Operand(Smi::FromInt(strict_mode_flag())));
- frame_->InvokeBuiltin(Builtins::DELETE, CALL_JS, 3);
- frame_->EmitPush(r0);
-
- } else if (variable != NULL) {
- // Delete of an unqualified identifier is disallowed in strict mode
- // but "delete this" is.
- ASSERT(strict_mode_flag() == kNonStrictMode || variable->is_this());
- Slot* slot = variable->AsSlot();
- if (variable->is_global()) {
- LoadGlobal();
- frame_->EmitPush(Operand(variable->name()));
- frame_->EmitPush(Operand(Smi::FromInt(kNonStrictMode)));
- frame_->InvokeBuiltin(Builtins::DELETE, CALL_JS, 3);
- frame_->EmitPush(r0);
-
- } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
- // Delete from the context holding the named variable.
- frame_->EmitPush(cp);
- frame_->EmitPush(Operand(variable->name()));
- frame_->CallRuntime(Runtime::kDeleteContextSlot, 2);
- frame_->EmitPush(r0);
-
- } else {
- // Default: Result of deleting non-global, not dynamically
- // introduced variables is false.
- frame_->EmitPushRoot(Heap::kFalseValueRootIndex);
- }
-
- } else {
- // Default: Result of deleting expressions is true.
- Load(node->expression()); // may have side-effects
- frame_->Drop();
- frame_->EmitPushRoot(Heap::kTrueValueRootIndex);
- }
-
- } else if (op == Token::TYPEOF) {
- // Special case for loading the typeof expression; see comment on
- // LoadTypeofExpression().
- LoadTypeofExpression(node->expression());
- frame_->CallRuntime(Runtime::kTypeof, 1);
- frame_->EmitPush(r0); // r0 has result
-
- } else {
- bool can_overwrite = node->expression()->ResultOverwriteAllowed();
- UnaryOverwriteMode overwrite =
- can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
-
- bool no_negative_zero = node->expression()->no_negative_zero();
- Load(node->expression());
- switch (op) {
- case Token::NOT:
- case Token::DELETE:
- case Token::TYPEOF:
- UNREACHABLE(); // handled above
- break;
-
- case Token::SUB: {
- frame_->PopToR0();
- GenericUnaryOpStub stub(
- Token::SUB,
- overwrite,
- NO_UNARY_FLAGS,
- no_negative_zero ? kIgnoreNegativeZero : kStrictNegativeZero);
- frame_->CallStub(&stub, 0);
- frame_->EmitPush(r0); // r0 has result
- break;
- }
-
- case Token::BIT_NOT: {
- Register tos = frame_->PopToRegister();
- JumpTarget not_smi_label;
- JumpTarget continue_label;
- // Smi check.
- __ tst(tos, Operand(kSmiTagMask));
- not_smi_label.Branch(ne);
-
- __ mvn(tos, Operand(tos));
- __ bic(tos, tos, Operand(kSmiTagMask)); // Bit-clear inverted smi-tag.
- frame_->EmitPush(tos);
- // The fast case is the first to jump to the continue label, so it gets
- // to decide the virtual frame layout.
- continue_label.Jump();
-
- not_smi_label.Bind();
- frame_->SpillAll();
- __ Move(r0, tos);
- GenericUnaryOpStub stub(Token::BIT_NOT,
- overwrite,
- NO_UNARY_SMI_CODE_IN_STUB);
- frame_->CallStub(&stub, 0);
- frame_->EmitPush(r0);
-
- continue_label.Bind();
- break;
- }
-
- case Token::VOID:
- frame_->Drop();
- frame_->EmitPushRoot(Heap::kUndefinedValueRootIndex);
- break;
-
- case Token::ADD: {
- Register tos = frame_->Peek();
- // Smi check.
- JumpTarget continue_label;
- __ tst(tos, Operand(kSmiTagMask));
- continue_label.Branch(eq);
-
- frame_->InvokeBuiltin(Builtins::TO_NUMBER, CALL_JS, 1);
- frame_->EmitPush(r0);
-
- continue_label.Bind();
- break;
- }
- default:
- UNREACHABLE();
- }
- }
- ASSERT(!has_valid_frame() ||
- (has_cc() && frame_->height() == original_height) ||
- (!has_cc() && frame_->height() == original_height + 1));
-}
-
-
-class DeferredCountOperation: public DeferredCode {
- public:
- DeferredCountOperation(Register value,
- bool is_increment,
- bool is_postfix,
- int target_size)
- : value_(value),
- is_increment_(is_increment),
- is_postfix_(is_postfix),
- target_size_(target_size) {}
-
- virtual void Generate() {
- VirtualFrame copied_frame(*frame_state()->frame());
-
- Label slow;
- // Check for smi operand.
- __ tst(value_, Operand(kSmiTagMask));
- __ b(ne, &slow);
-
- // Revert optimistic increment/decrement.
- if (is_increment_) {
- __ sub(value_, value_, Operand(Smi::FromInt(1)));
- } else {
- __ add(value_, value_, Operand(Smi::FromInt(1)));
- }
-
- // Slow case: Convert to number. At this point the
- // value to be incremented is in the value register..
- __ bind(&slow);
-
- // Convert the operand to a number.
- copied_frame.EmitPush(value_);
-
- copied_frame.InvokeBuiltin(Builtins::TO_NUMBER, CALL_JS, 1);
-
- if (is_postfix_) {
- // Postfix: store to result (on the stack).
- __ str(r0, MemOperand(sp, target_size_ * kPointerSize));
- }
-
- copied_frame.EmitPush(r0);
- copied_frame.EmitPush(Operand(Smi::FromInt(1)));
-
- if (is_increment_) {
- copied_frame.CallRuntime(Runtime::kNumberAdd, 2);
- } else {
- copied_frame.CallRuntime(Runtime::kNumberSub, 2);
- }
-
- __ Move(value_, r0);
-
- copied_frame.MergeTo(frame_state()->frame());
- }
-
- private:
- Register value_;
- bool is_increment_;
- bool is_postfix_;
- int target_size_;
-};
-
-
-void CodeGenerator::VisitCountOperation(CountOperation* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ CountOperation");
- VirtualFrame::RegisterAllocationScope scope(this);
-
- bool is_postfix = node->is_postfix();
- bool is_increment = node->op() == Token::INC;
-
- Variable* var = node->expression()->AsVariableProxy()->AsVariable();
- bool is_const = (var != NULL && var->mode() == Variable::CONST);
- bool is_slot = (var != NULL && var->mode() == Variable::VAR);
-
- if (!is_const && is_slot && type_info(var->AsSlot()).IsSmi()) {
- // The type info declares that this variable is always a Smi. That
- // means it is a Smi both before and after the increment/decrement.
- // Lets make use of that to make a very minimal count.
- Reference target(this, node->expression(), !is_const);
- ASSERT(!target.is_illegal());
- target.GetValue(); // Pushes the value.
- Register value = frame_->PopToRegister();
- if (is_postfix) frame_->EmitPush(value);
- if (is_increment) {
- __ add(value, value, Operand(Smi::FromInt(1)));
- } else {
- __ sub(value, value, Operand(Smi::FromInt(1)));
- }
- frame_->EmitPush(value);
- target.SetValue(NOT_CONST_INIT, LIKELY_SMI);
- if (is_postfix) frame_->Pop();
- ASSERT_EQ(original_height + 1, frame_->height());
- return;
- }
-
- // If it's a postfix expression and its result is not ignored and the
- // reference is non-trivial, then push a placeholder on the stack now
- // to hold the result of the expression.
- bool placeholder_pushed = false;
- if (!is_slot && is_postfix) {
- frame_->EmitPush(Operand(Smi::FromInt(0)));
- placeholder_pushed = true;
- }
-
- // A constant reference is not saved to, so a constant reference is not a
- // compound assignment reference.
- { Reference target(this, node->expression(), !is_const);
- if (target.is_illegal()) {
- // Spoof the virtual frame to have the expected height (one higher
- // than on entry).
- if (!placeholder_pushed) frame_->EmitPush(Operand(Smi::FromInt(0)));
- ASSERT_EQ(original_height + 1, frame_->height());
- return;
- }
-
- // This pushes 0, 1 or 2 words on the object to be used later when updating
- // the target. It also pushes the current value of the target.
- target.GetValue();
-
- bool value_is_known_smi = frame_->KnownSmiAt(0);
- Register value = frame_->PopToRegister();
-
- // Postfix: Store the old value as the result.
- if (placeholder_pushed) {
- frame_->SetElementAt(value, target.size());
- } else if (is_postfix) {
- frame_->EmitPush(value);
- __ mov(VirtualFrame::scratch0(), value);
- value = VirtualFrame::scratch0();
- }
-
- // We can't use any type information here since the virtual frame from the
- // deferred code may have lost information and we can't merge a virtual
- // frame with less specific type knowledge to a virtual frame with more
- // specific knowledge that has already used that specific knowledge to
- // generate code.
- frame_->ForgetTypeInfo();
-
- // The constructor here will capture the current virtual frame and use it to
- // merge to after the deferred code has run. No virtual frame changes are
- // allowed from here until the 'BindExit' below.
- DeferredCode* deferred =
- new DeferredCountOperation(value,
- is_increment,
- is_postfix,
- target.size());
- if (!value_is_known_smi) {
- // Check for smi operand.
- __ tst(value, Operand(kSmiTagMask));
-
- deferred->Branch(ne);
- }
-
- // Perform optimistic increment/decrement.
- if (is_increment) {
- __ add(value, value, Operand(Smi::FromInt(1)), SetCC);
- } else {
- __ sub(value, value, Operand(Smi::FromInt(1)), SetCC);
- }
-
- // If increment/decrement overflows, go to deferred code.
- deferred->Branch(vs);
-
- deferred->BindExit();
-
- // Store the new value in the target if not const.
- // At this point the answer is in the value register.
- frame_->EmitPush(value);
- // Set the target with the result, leaving the result on
- // top of the stack. Removes the target from the stack if
- // it has a non-zero size.
- if (!is_const) target.SetValue(NOT_CONST_INIT, LIKELY_SMI);
- }
-
- // Postfix: Discard the new value and use the old.
- if (is_postfix) frame_->Pop();
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::GenerateLogicalBooleanOperation(BinaryOperation* node) {
- // According to ECMA-262 section 11.11, page 58, the binary logical
- // operators must yield the result of one of the two expressions
- // before any ToBoolean() conversions. This means that the value
- // produced by a && or || operator is not necessarily a boolean.
-
- // NOTE: If the left hand side produces a materialized value (not in
- // the CC register), we force the right hand side to do the
- // same. This is necessary because we may have to branch to the exit
- // after evaluating the left hand side (due to the shortcut
- // semantics), but the compiler must (statically) know if the result
- // of compiling the binary operation is materialized or not.
- if (node->op() == Token::AND) {
- JumpTarget is_true;
- LoadCondition(node->left(), &is_true, false_target(), false);
- if (has_valid_frame() && !has_cc()) {
- // The left-hand side result is on top of the virtual frame.
- JumpTarget pop_and_continue;
- JumpTarget exit;
-
- frame_->Dup();
- // Avoid popping the result if it converts to 'false' using the
- // standard ToBoolean() conversion as described in ECMA-262,
- // section 9.2, page 30.
- ToBoolean(&pop_and_continue, &exit);
- Branch(false, &exit);
-
- // Pop the result of evaluating the first part.
- pop_and_continue.Bind();
- frame_->Pop();
-
- // Evaluate right side expression.
- is_true.Bind();
- Load(node->right());
-
- // Exit (always with a materialized value).
- exit.Bind();
- } else if (has_cc() || is_true.is_linked()) {
- // The left-hand side is either (a) partially compiled to
- // control flow with a final branch left to emit or (b) fully
- // compiled to control flow and possibly true.
- if (has_cc()) {
- Branch(false, false_target());
- }
- is_true.Bind();
- LoadCondition(node->right(), true_target(), false_target(), false);
- } else {
- // Nothing to do.
- ASSERT(!has_valid_frame() && !has_cc() && !is_true.is_linked());
- }
-
- } else {
- ASSERT(node->op() == Token::OR);
- JumpTarget is_false;
- LoadCondition(node->left(), true_target(), &is_false, false);
- if (has_valid_frame() && !has_cc()) {
- // The left-hand side result is on top of the virtual frame.
- JumpTarget pop_and_continue;
- JumpTarget exit;
-
- frame_->Dup();
- // Avoid popping the result if it converts to 'true' using the
- // standard ToBoolean() conversion as described in ECMA-262,
- // section 9.2, page 30.
- ToBoolean(&exit, &pop_and_continue);
- Branch(true, &exit);
-
- // Pop the result of evaluating the first part.
- pop_and_continue.Bind();
- frame_->Pop();
-
- // Evaluate right side expression.
- is_false.Bind();
- Load(node->right());
-
- // Exit (always with a materialized value).
- exit.Bind();
- } else if (has_cc() || is_false.is_linked()) {
- // The left-hand side is either (a) partially compiled to
- // control flow with a final branch left to emit or (b) fully
- // compiled to control flow and possibly false.
- if (has_cc()) {
- Branch(true, true_target());
- }
- is_false.Bind();
- LoadCondition(node->right(), true_target(), false_target(), false);
- } else {
- // Nothing to do.
- ASSERT(!has_valid_frame() && !has_cc() && !is_false.is_linked());
- }
- }
-}
-
-
-void CodeGenerator::VisitBinaryOperation(BinaryOperation* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ BinaryOperation");
-
- if (node->op() == Token::AND || node->op() == Token::OR) {
- GenerateLogicalBooleanOperation(node);
- } else {
- // Optimize for the case where (at least) one of the expressions
- // is a literal small integer.
- Literal* lliteral = node->left()->AsLiteral();
- Literal* rliteral = node->right()->AsLiteral();
- // NOTE: The code below assumes that the slow cases (calls to runtime)
- // never return a constant/immutable object.
- bool overwrite_left = node->left()->ResultOverwriteAllowed();
- bool overwrite_right = node->right()->ResultOverwriteAllowed();
-
- if (rliteral != NULL && rliteral->handle()->IsSmi()) {
- VirtualFrame::RegisterAllocationScope scope(this);
- Load(node->left());
- if (frame_->KnownSmiAt(0)) overwrite_left = false;
- SmiOperation(node->op(),
- rliteral->handle(),
- false,
- overwrite_left ? OVERWRITE_LEFT : NO_OVERWRITE);
- } else if (lliteral != NULL && lliteral->handle()->IsSmi()) {
- VirtualFrame::RegisterAllocationScope scope(this);
- Load(node->right());
- if (frame_->KnownSmiAt(0)) overwrite_right = false;
- SmiOperation(node->op(),
- lliteral->handle(),
- true,
- overwrite_right ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- GenerateInlineSmi inline_smi =
- loop_nesting() > 0 ? GENERATE_INLINE_SMI : DONT_GENERATE_INLINE_SMI;
- if (lliteral != NULL) {
- ASSERT(!lliteral->handle()->IsSmi());
- inline_smi = DONT_GENERATE_INLINE_SMI;
- }
- if (rliteral != NULL) {
- ASSERT(!rliteral->handle()->IsSmi());
- inline_smi = DONT_GENERATE_INLINE_SMI;
- }
- VirtualFrame::RegisterAllocationScope scope(this);
- OverwriteMode overwrite_mode = NO_OVERWRITE;
- if (overwrite_left) {
- overwrite_mode = OVERWRITE_LEFT;
- } else if (overwrite_right) {
- overwrite_mode = OVERWRITE_RIGHT;
- }
- Load(node->left());
- Load(node->right());
- GenericBinaryOperation(node->op(), overwrite_mode, inline_smi);
- }
- }
- ASSERT(!has_valid_frame() ||
- (has_cc() && frame_->height() == original_height) ||
- (!has_cc() && frame_->height() == original_height + 1));
-}
-
-
-void CodeGenerator::VisitThisFunction(ThisFunction* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- frame_->EmitPush(MemOperand(frame_->Function()));
- ASSERT_EQ(original_height + 1, frame_->height());
-}
-
-
-void CodeGenerator::VisitCompareOperation(CompareOperation* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ CompareOperation");
-
- VirtualFrame::RegisterAllocationScope nonspilled_scope(this);
-
- // Get the expressions from the node.
- Expression* left = node->left();
- Expression* right = node->right();
- Token::Value op = node->op();
-
- // To make typeof testing for natives implemented in JavaScript really
- // efficient, we generate special code for expressions of the form:
- // 'typeof <expression> == <string>'.
- UnaryOperation* operation = left->AsUnaryOperation();
- if ((op == Token::EQ || op == Token::EQ_STRICT) &&
- (operation != NULL && operation->op() == Token::TYPEOF) &&
- (right->AsLiteral() != NULL &&
- right->AsLiteral()->handle()->IsString())) {
- Handle<String> check(String::cast(*right->AsLiteral()->handle()));
-
- // Load the operand, move it to a register.
- LoadTypeofExpression(operation->expression());
- Register tos = frame_->PopToRegister();
-
- Register scratch = VirtualFrame::scratch0();
-
- if (check->Equals(HEAP->number_symbol())) {
- __ tst(tos, Operand(kSmiTagMask));
- true_target()->Branch(eq);
- __ ldr(tos, FieldMemOperand(tos, HeapObject::kMapOffset));
- __ LoadRoot(ip, Heap::kHeapNumberMapRootIndex);
- __ cmp(tos, ip);
- cc_reg_ = eq;
-
- } else if (check->Equals(HEAP->string_symbol())) {
- __ tst(tos, Operand(kSmiTagMask));
- false_target()->Branch(eq);
-
- __ ldr(tos, FieldMemOperand(tos, HeapObject::kMapOffset));
-
- // It can be an undetectable string object.
- __ ldrb(scratch, FieldMemOperand(tos, Map::kBitFieldOffset));
- __ and_(scratch, scratch, Operand(1 << Map::kIsUndetectable));
- __ cmp(scratch, Operand(1 << Map::kIsUndetectable));
- false_target()->Branch(eq);
-
- __ ldrb(scratch, FieldMemOperand(tos, Map::kInstanceTypeOffset));
- __ cmp(scratch, Operand(FIRST_NONSTRING_TYPE));
- cc_reg_ = lt;
-
- } else if (check->Equals(HEAP->boolean_symbol())) {
- __ LoadRoot(ip, Heap::kTrueValueRootIndex);
- __ cmp(tos, ip);
- true_target()->Branch(eq);
- __ LoadRoot(ip, Heap::kFalseValueRootIndex);
- __ cmp(tos, ip);
- cc_reg_ = eq;
-
- } else if (check->Equals(HEAP->undefined_symbol())) {
- __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
- __ cmp(tos, ip);
- true_target()->Branch(eq);
-
- __ tst(tos, Operand(kSmiTagMask));
- false_target()->Branch(eq);
-
- // It can be an undetectable object.
- __ ldr(tos, FieldMemOperand(tos, HeapObject::kMapOffset));
- __ ldrb(scratch, FieldMemOperand(tos, Map::kBitFieldOffset));
- __ and_(scratch, scratch, Operand(1 << Map::kIsUndetectable));
- __ cmp(scratch, Operand(1 << Map::kIsUndetectable));
-
- cc_reg_ = eq;
-
- } else if (check->Equals(HEAP->function_symbol())) {
- __ tst(tos, Operand(kSmiTagMask));
- false_target()->Branch(eq);
- Register map_reg = scratch;
- __ CompareObjectType(tos, map_reg, tos, JS_FUNCTION_TYPE);
- true_target()->Branch(eq);
- // Regular expressions are callable so typeof == 'function'.
- __ CompareInstanceType(map_reg, tos, JS_REGEXP_TYPE);
- cc_reg_ = eq;
-
- } else if (check->Equals(HEAP->object_symbol())) {
- __ tst(tos, Operand(kSmiTagMask));
- false_target()->Branch(eq);
-
- __ LoadRoot(ip, Heap::kNullValueRootIndex);
- __ cmp(tos, ip);
- true_target()->Branch(eq);
-
- Register map_reg = scratch;
- __ CompareObjectType(tos, map_reg, tos, JS_REGEXP_TYPE);
- false_target()->Branch(eq);
-
- // It can be an undetectable object.
- __ ldrb(tos, FieldMemOperand(map_reg, Map::kBitFieldOffset));
- __ and_(tos, tos, Operand(1 << Map::kIsUndetectable));
- __ cmp(tos, Operand(1 << Map::kIsUndetectable));
- false_target()->Branch(eq);
-
- __ ldrb(tos, FieldMemOperand(map_reg, Map::kInstanceTypeOffset));
- __ cmp(tos, Operand(FIRST_JS_OBJECT_TYPE));
- false_target()->Branch(lt);
- __ cmp(tos, Operand(LAST_JS_OBJECT_TYPE));
- cc_reg_ = le;
-
- } else {
- // Uncommon case: typeof testing against a string literal that is
- // never returned from the typeof operator.
- false_target()->Jump();
- }
- ASSERT(!has_valid_frame() ||
- (has_cc() && frame_->height() == original_height));
- return;
- }
-
- switch (op) {
- case Token::EQ:
- Comparison(eq, left, right, false);
- break;
-
- case Token::LT:
- Comparison(lt, left, right);
- break;
-
- case Token::GT:
- Comparison(gt, left, right);
- break;
-
- case Token::LTE:
- Comparison(le, left, right);
- break;
-
- case Token::GTE:
- Comparison(ge, left, right);
- break;
-
- case Token::EQ_STRICT:
- Comparison(eq, left, right, true);
- break;
-
- case Token::IN: {
- Load(left);
- Load(right);
- frame_->InvokeBuiltin(Builtins::IN, CALL_JS, 2);
- frame_->EmitPush(r0);
- break;
- }
-
- case Token::INSTANCEOF: {
- Load(left);
- Load(right);
- InstanceofStub stub(InstanceofStub::kNoFlags);
- frame_->CallStub(&stub, 2);
- // At this point if instanceof succeeded then r0 == 0.
- __ tst(r0, Operand(r0));
- cc_reg_ = eq;
- break;
- }
-
- default:
- UNREACHABLE();
- }
- ASSERT((has_cc() && frame_->height() == original_height) ||
- (!has_cc() && frame_->height() == original_height + 1));
-}
-
-
-void CodeGenerator::VisitCompareToNull(CompareToNull* node) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- Comment cmnt(masm_, "[ CompareToNull");
-
- Load(node->expression());
- Register tos = frame_->PopToRegister();
- __ LoadRoot(ip, Heap::kNullValueRootIndex);
- __ cmp(tos, ip);
-
- // The 'null' value is only equal to 'undefined' if using non-strict
- // comparisons.
- if (!node->is_strict()) {
- true_target()->Branch(eq);
- __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
- __ cmp(tos, Operand(ip));
- true_target()->Branch(eq);
-
- __ tst(tos, Operand(kSmiTagMask));
- false_target()->Branch(eq);
-
- // It can be an undetectable object.
- __ ldr(tos, FieldMemOperand(tos, HeapObject::kMapOffset));
- __ ldrb(tos, FieldMemOperand(tos, Map::kBitFieldOffset));
- __ and_(tos, tos, Operand(1 << Map::kIsUndetectable));
- __ cmp(tos, Operand(1 << Map::kIsUndetectable));
- }
-
- cc_reg_ = eq;
- ASSERT(has_cc() && frame_->height() == original_height);
-}
-
-
-class DeferredReferenceGetNamedValue: public DeferredCode {
- public:
- explicit DeferredReferenceGetNamedValue(Register receiver,
- Handle<String> name,
- bool is_contextual)
- : receiver_(receiver),
- name_(name),
- is_contextual_(is_contextual),
- is_dont_delete_(false) {
- set_comment(is_contextual
- ? "[ DeferredReferenceGetNamedValue (contextual)"
- : "[ DeferredReferenceGetNamedValue");
- }
-
- virtual void Generate();
-
- void set_is_dont_delete(bool value) {
- ASSERT(is_contextual_);
- is_dont_delete_ = value;
- }
-
- private:
- Register receiver_;
- Handle<String> name_;
- bool is_contextual_;
- bool is_dont_delete_;
-};
-
-
-// Convention for this is that on entry the receiver is in a register that
-// is not used by the stack. On exit the answer is found in that same
-// register and the stack has the same height.
-void DeferredReferenceGetNamedValue::Generate() {
-#ifdef DEBUG
- int expected_height = frame_state()->frame()->height();
-#endif
- VirtualFrame copied_frame(*frame_state()->frame());
- copied_frame.SpillAll();
-
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- ASSERT(!receiver_.is(scratch1) && !receiver_.is(scratch2));
- __ DecrementCounter(masm_->isolate()->counters()->named_load_inline(),
- 1, scratch1, scratch2);
- __ IncrementCounter(masm_->isolate()->counters()->named_load_inline_miss(),
- 1, scratch1, scratch2);
-
- // Ensure receiver in r0 and name in r2 to match load ic calling convention.
- __ Move(r0, receiver_);
- __ mov(r2, Operand(name_));
-
- // The rest of the instructions in the deferred code must be together.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kLoadIC_Initialize));
- RelocInfo::Mode mode = is_contextual_
- ? RelocInfo::CODE_TARGET_CONTEXT
- : RelocInfo::CODE_TARGET;
- __ Call(ic, mode);
- // We must mark the code just after the call with the correct marker.
- MacroAssembler::NopMarkerTypes code_marker;
- if (is_contextual_) {
- code_marker = is_dont_delete_
- ? MacroAssembler::PROPERTY_ACCESS_INLINED_CONTEXT_DONT_DELETE
- : MacroAssembler::PROPERTY_ACCESS_INLINED_CONTEXT;
- } else {
- code_marker = MacroAssembler::PROPERTY_ACCESS_INLINED;
- }
- __ MarkCode(code_marker);
-
- // At this point the answer is in r0. We move it to the expected register
- // if necessary.
- __ Move(receiver_, r0);
-
- // Now go back to the frame that we entered with. This will not overwrite
- // the receiver register since that register was not in use when we came
- // in. The instructions emitted by this merge are skipped over by the
- // inline load patching mechanism when looking for the branch instruction
- // that tells it where the code to patch is.
- copied_frame.MergeTo(frame_state()->frame());
-
- // Block the constant pool for one more instruction after leaving this
- // constant pool block scope to include the branch instruction ending the
- // deferred code.
- __ BlockConstPoolFor(1);
- }
- ASSERT_EQ(expected_height, frame_state()->frame()->height());
-}
-
-
-class DeferredReferenceGetKeyedValue: public DeferredCode {
- public:
- DeferredReferenceGetKeyedValue(Register key, Register receiver)
- : key_(key), receiver_(receiver) {
- set_comment("[ DeferredReferenceGetKeyedValue");
- }
-
- virtual void Generate();
-
- private:
- Register key_;
- Register receiver_;
-};
-
-
-// Takes key and register in r0 and r1 or vice versa. Returns result
-// in r0.
-void DeferredReferenceGetKeyedValue::Generate() {
- ASSERT((key_.is(r0) && receiver_.is(r1)) ||
- (key_.is(r1) && receiver_.is(r0)));
-
- VirtualFrame copied_frame(*frame_state()->frame());
- copied_frame.SpillAll();
-
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- __ DecrementCounter(masm_->isolate()->counters()->keyed_load_inline(),
- 1, scratch1, scratch2);
- __ IncrementCounter(masm_->isolate()->counters()->keyed_load_inline_miss(),
- 1, scratch1, scratch2);
-
- // Ensure key in r0 and receiver in r1 to match keyed load ic calling
- // convention.
- if (key_.is(r1)) {
- __ Swap(r0, r1, ip);
- }
-
- // The rest of the instructions in the deferred code must be together.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- // Call keyed load IC. It has the arguments key and receiver in r0 and r1.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kKeyedLoadIC_Initialize));
- __ Call(ic, RelocInfo::CODE_TARGET);
- // The call must be followed by a nop instruction to indicate that the
- // keyed load has been inlined.
- __ MarkCode(MacroAssembler::PROPERTY_ACCESS_INLINED);
-
- // Now go back to the frame that we entered with. This will not overwrite
- // the receiver or key registers since they were not in use when we came
- // in. The instructions emitted by this merge are skipped over by the
- // inline load patching mechanism when looking for the branch instruction
- // that tells it where the code to patch is.
- copied_frame.MergeTo(frame_state()->frame());
-
- // Block the constant pool for one more instruction after leaving this
- // constant pool block scope to include the branch instruction ending the
- // deferred code.
- __ BlockConstPoolFor(1);
- }
-}
-
-
-class DeferredReferenceSetKeyedValue: public DeferredCode {
- public:
- DeferredReferenceSetKeyedValue(Register value,
- Register key,
- Register receiver,
- StrictModeFlag strict_mode)
- : value_(value),
- key_(key),
- receiver_(receiver),
- strict_mode_(strict_mode) {
- set_comment("[ DeferredReferenceSetKeyedValue");
- }
-
- virtual void Generate();
-
- private:
- Register value_;
- Register key_;
- Register receiver_;
- StrictModeFlag strict_mode_;
-};
-
-
-void DeferredReferenceSetKeyedValue::Generate() {
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- __ DecrementCounter(masm_->isolate()->counters()->keyed_store_inline(),
- 1, scratch1, scratch2);
- __ IncrementCounter(masm_->isolate()->counters()->keyed_store_inline_miss(),
- 1, scratch1, scratch2);
-
- // Ensure value in r0, key in r1 and receiver in r2 to match keyed store ic
- // calling convention.
- if (value_.is(r1)) {
- __ Swap(r0, r1, ip);
- }
- ASSERT(receiver_.is(r2));
-
- // The rest of the instructions in the deferred code must be together.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- // Call keyed store IC. It has the arguments value, key and receiver in r0,
- // r1 and r2.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode_ == kStrictMode)
- ? Builtins::kKeyedStoreIC_Initialize_Strict
- : Builtins::kKeyedStoreIC_Initialize));
- __ Call(ic, RelocInfo::CODE_TARGET);
- // The call must be followed by a nop instruction to indicate that the
- // keyed store has been inlined.
- __ MarkCode(MacroAssembler::PROPERTY_ACCESS_INLINED);
-
- // Block the constant pool for one more instruction after leaving this
- // constant pool block scope to include the branch instruction ending the
- // deferred code.
- __ BlockConstPoolFor(1);
- }
-}
-
-
-class DeferredReferenceSetNamedValue: public DeferredCode {
- public:
- DeferredReferenceSetNamedValue(Register value,
- Register receiver,
- Handle<String> name,
- StrictModeFlag strict_mode)
- : value_(value),
- receiver_(receiver),
- name_(name),
- strict_mode_(strict_mode) {
- set_comment("[ DeferredReferenceSetNamedValue");
- }
-
- virtual void Generate();
-
- private:
- Register value_;
- Register receiver_;
- Handle<String> name_;
- StrictModeFlag strict_mode_;
-};
-
-
-// Takes value in r0, receiver in r1 and returns the result (the
-// value) in r0.
-void DeferredReferenceSetNamedValue::Generate() {
- // Record the entry frame and spill.
- VirtualFrame copied_frame(*frame_state()->frame());
- copied_frame.SpillAll();
-
- // Ensure value in r0, receiver in r1 to match store ic calling
- // convention.
- ASSERT(value_.is(r0) && receiver_.is(r1));
- __ mov(r2, Operand(name_));
-
- // The rest of the instructions in the deferred code must be together.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- // Call keyed store IC. It has the arguments value, key and receiver in r0,
- // r1 and r2.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode_ == kStrictMode) ? Builtins::kStoreIC_Initialize_Strict
- : Builtins::kStoreIC_Initialize));
- __ Call(ic, RelocInfo::CODE_TARGET);
- // The call must be followed by a nop instruction to indicate that the
- // named store has been inlined.
- __ MarkCode(MacroAssembler::PROPERTY_ACCESS_INLINED);
-
- // Go back to the frame we entered with. The instructions
- // generated by this merge are skipped over by the inline store
- // patching mechanism when looking for the branch instruction that
- // tells it where the code to patch is.
- copied_frame.MergeTo(frame_state()->frame());
-
- // Block the constant pool for one more instruction after leaving this
- // constant pool block scope to include the branch instruction ending the
- // deferred code.
- __ BlockConstPoolFor(1);
- }
-}
-
-
-// Consumes the top of stack (the receiver) and pushes the result instead.
-void CodeGenerator::EmitNamedLoad(Handle<String> name, bool is_contextual) {
- bool contextual_load_in_builtin =
- is_contextual &&
- (ISOLATE->bootstrapper()->IsActive() ||
- (!info_->closure().is_null() && info_->closure()->IsBuiltin()));
-
- if (scope()->is_global_scope() ||
- loop_nesting() == 0 ||
- contextual_load_in_builtin) {
- Comment cmnt(masm(), "[ Load from named Property");
- // Setup the name register and call load IC.
- frame_->CallLoadIC(name,
- is_contextual
- ? RelocInfo::CODE_TARGET_CONTEXT
- : RelocInfo::CODE_TARGET);
- frame_->EmitPush(r0); // Push answer.
- } else {
- // Inline the in-object property case.
- Comment cmnt(masm(), is_contextual
- ? "[ Inlined contextual property load"
- : "[ Inlined named property load");
-
- // Counter will be decremented in the deferred code. Placed here to avoid
- // having it in the instruction stream below where patching will occur.
- if (is_contextual) {
- __ IncrementCounter(
- masm_->isolate()->counters()->named_load_global_inline(),
- 1, frame_->scratch0(), frame_->scratch1());
- } else {
- __ IncrementCounter(masm_->isolate()->counters()->named_load_inline(),
- 1, frame_->scratch0(), frame_->scratch1());
- }
-
- // The following instructions are the inlined load of an in-object property.
- // Parts of this code is patched, so the exact instructions generated needs
- // to be fixed. Therefore the instruction pool is blocked when generating
- // this code
-
- // Load the receiver from the stack.
- Register receiver = frame_->PopToRegister();
-
- DeferredReferenceGetNamedValue* deferred =
- new DeferredReferenceGetNamedValue(receiver, name, is_contextual);
-
- bool is_dont_delete = false;
- if (is_contextual) {
- if (!info_->closure().is_null()) {
- // When doing lazy compilation we can check if the global cell
- // already exists and use its "don't delete" status as a hint.
- AssertNoAllocation no_gc;
- v8::internal::GlobalObject* global_object =
- info_->closure()->context()->global();
- LookupResult lookup;
- global_object->LocalLookupRealNamedProperty(*name, &lookup);
- if (lookup.IsProperty() && lookup.type() == NORMAL) {
- ASSERT(lookup.holder() == global_object);
- ASSERT(global_object->property_dictionary()->ValueAt(
- lookup.GetDictionaryEntry())->IsJSGlobalPropertyCell());
- is_dont_delete = lookup.IsDontDelete();
- }
- }
- if (is_dont_delete) {
- __ IncrementCounter(
- masm_->isolate()->counters()->dont_delete_hint_hit(),
- 1, frame_->scratch0(), frame_->scratch1());
- }
- }
-
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- if (!is_contextual) {
- // Check that the receiver is a heap object.
- __ tst(receiver, Operand(kSmiTagMask));
- deferred->Branch(eq);
- }
-
- // Check for the_hole_value if necessary.
- // Below we rely on the number of instructions generated, and we can't
- // cope with the Check macro which does not generate a fixed number of
- // instructions.
- Label skip, check_the_hole, cont;
- if (FLAG_debug_code && is_contextual && is_dont_delete) {
- __ b(&skip);
- __ bind(&check_the_hole);
- __ Check(ne, "DontDelete cells can't contain the hole");
- __ b(&cont);
- __ bind(&skip);
- }
-
-#ifdef DEBUG
- int InlinedNamedLoadInstructions = 5;
- Label check_inlined_codesize;
- masm_->bind(&check_inlined_codesize);
-#endif
-
- Register scratch = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
-
- // Check the map. The null map used below is patched by the inline cache
- // code. Therefore we can't use a LoadRoot call.
- __ ldr(scratch, FieldMemOperand(receiver, HeapObject::kMapOffset));
- __ mov(scratch2, Operand(FACTORY->null_value()));
- __ cmp(scratch, scratch2);
- deferred->Branch(ne);
-
- if (is_contextual) {
-#ifdef DEBUG
- InlinedNamedLoadInstructions += 1;
-#endif
- // Load the (initially invalid) cell and get its value.
- masm()->mov(receiver, Operand(FACTORY->null_value()));
- __ ldr(receiver,
- FieldMemOperand(receiver, JSGlobalPropertyCell::kValueOffset));
-
- deferred->set_is_dont_delete(is_dont_delete);
-
- if (!is_dont_delete) {
-#ifdef DEBUG
- InlinedNamedLoadInstructions += 3;
-#endif
- __ cmp(receiver, Operand(FACTORY->the_hole_value()));
- deferred->Branch(eq);
- } else if (FLAG_debug_code) {
-#ifdef DEBUG
- InlinedNamedLoadInstructions += 3;
-#endif
- __ cmp(receiver, Operand(FACTORY->the_hole_value()));
- __ b(&check_the_hole, eq);
- __ bind(&cont);
- }
- } else {
- // Initially use an invalid index. The index will be patched by the
- // inline cache code.
- __ ldr(receiver, MemOperand(receiver, 0));
- }
-
- // Make sure that the expected number of instructions are generated.
- // If the code before is updated, the offsets in ic-arm.cc
- // LoadIC::PatchInlinedContextualLoad and PatchInlinedLoad need
- // to be updated.
- ASSERT_EQ(InlinedNamedLoadInstructions,
- masm_->InstructionsGeneratedSince(&check_inlined_codesize));
- }
-
- deferred->BindExit();
- // At this point the receiver register has the result, either from the
- // deferred code or from the inlined code.
- frame_->EmitPush(receiver);
- }
-}
-
-
-void CodeGenerator::EmitNamedStore(Handle<String> name, bool is_contextual) {
-#ifdef DEBUG
- int expected_height = frame()->height() - (is_contextual ? 1 : 2);
-#endif
-
- Result result;
- if (is_contextual || scope()->is_global_scope() || loop_nesting() == 0) {
- frame()->CallStoreIC(name, is_contextual, strict_mode_flag());
- } else {
- // Inline the in-object property case.
- JumpTarget slow, done;
-
- // Get the value and receiver from the stack.
- frame()->PopToR0();
- Register value = r0;
- frame()->PopToR1();
- Register receiver = r1;
-
- DeferredReferenceSetNamedValue* deferred =
- new DeferredReferenceSetNamedValue(
- value, receiver, name, strict_mode_flag());
-
- // Check that the receiver is a heap object.
- __ tst(receiver, Operand(kSmiTagMask));
- deferred->Branch(eq);
-
- // The following instructions are the part of the inlined
- // in-object property store code which can be patched. Therefore
- // the exact number of instructions generated must be fixed, so
- // the constant pool is blocked while generating this code.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- Register scratch0 = VirtualFrame::scratch0();
- Register scratch1 = VirtualFrame::scratch1();
-
- // Check the map. Initially use an invalid map to force a
- // failure. The map check will be patched in the runtime system.
- __ ldr(scratch1, FieldMemOperand(receiver, HeapObject::kMapOffset));
-
-#ifdef DEBUG
- Label check_inlined_codesize;
- masm_->bind(&check_inlined_codesize);
-#endif
- __ mov(scratch0, Operand(FACTORY->null_value()));
- __ cmp(scratch0, scratch1);
- deferred->Branch(ne);
-
- int offset = 0;
- __ str(value, MemOperand(receiver, offset));
-
- // Update the write barrier and record its size. We do not use
- // the RecordWrite macro here because we want the offset
- // addition instruction first to make it easy to patch.
- Label record_write_start, record_write_done;
- __ bind(&record_write_start);
- // Add offset into the object.
- __ add(scratch0, receiver, Operand(offset));
- // Test that the object is not in the new space. We cannot set
- // region marks for new space pages.
- __ InNewSpace(receiver, scratch1, eq, &record_write_done);
- // Record the actual write.
- __ RecordWriteHelper(receiver, scratch0, scratch1);
- __ bind(&record_write_done);
- // Clobber all input registers when running with the debug-code flag
- // turned on to provoke errors.
- if (FLAG_debug_code) {
- __ mov(receiver, Operand(BitCast<int32_t>(kZapValue)));
- __ mov(scratch0, Operand(BitCast<int32_t>(kZapValue)));
- __ mov(scratch1, Operand(BitCast<int32_t>(kZapValue)));
- }
- // Check that this is the first inlined write barrier or that
- // this inlined write barrier has the same size as all the other
- // inlined write barriers.
- ASSERT((Isolate::Current()->inlined_write_barrier_size() == -1) ||
- (Isolate::Current()->inlined_write_barrier_size() ==
- masm()->InstructionsGeneratedSince(&record_write_start)));
- Isolate::Current()->set_inlined_write_barrier_size(
- masm()->InstructionsGeneratedSince(&record_write_start));
-
- // Make sure that the expected number of instructions are generated.
- ASSERT_EQ(GetInlinedNamedStoreInstructionsAfterPatch(),
- masm()->InstructionsGeneratedSince(&check_inlined_codesize));
- }
- deferred->BindExit();
- }
- ASSERT_EQ(expected_height, frame()->height());
-}
-
-
-void CodeGenerator::EmitKeyedLoad() {
- if (loop_nesting() == 0) {
- Comment cmnt(masm_, "[ Load from keyed property");
- frame_->CallKeyedLoadIC();
- } else {
- // Inline the keyed load.
- Comment cmnt(masm_, "[ Inlined load from keyed property");
-
- // Counter will be decremented in the deferred code. Placed here to avoid
- // having it in the instruction stream below where patching will occur.
- __ IncrementCounter(masm_->isolate()->counters()->keyed_load_inline(),
- 1, frame_->scratch0(), frame_->scratch1());
-
- // Load the key and receiver from the stack.
- bool key_is_known_smi = frame_->KnownSmiAt(0);
- Register key = frame_->PopToRegister();
- Register receiver = frame_->PopToRegister(key);
-
- // The deferred code expects key and receiver in registers.
- DeferredReferenceGetKeyedValue* deferred =
- new DeferredReferenceGetKeyedValue(key, receiver);
-
- // Check that the receiver is a heap object.
- __ tst(receiver, Operand(kSmiTagMask));
- deferred->Branch(eq);
-
- // The following instructions are the part of the inlined load keyed
- // property code which can be patched. Therefore the exact number of
- // instructions generated need to be fixed, so the constant pool is blocked
- // while generating this code.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- // Check the map. The null map used below is patched by the inline cache
- // code.
- __ ldr(scratch1, FieldMemOperand(receiver, HeapObject::kMapOffset));
-
- // Check that the key is a smi.
- if (!key_is_known_smi) {
- __ tst(key, Operand(kSmiTagMask));
- deferred->Branch(ne);
- }
-
-#ifdef DEBUG
- Label check_inlined_codesize;
- masm_->bind(&check_inlined_codesize);
-#endif
- __ mov(scratch2, Operand(FACTORY->null_value()));
- __ cmp(scratch1, scratch2);
- deferred->Branch(ne);
-
- // Get the elements array from the receiver.
- __ ldr(scratch1, FieldMemOperand(receiver, JSObject::kElementsOffset));
- __ AssertFastElements(scratch1);
-
- // Check that key is within bounds. Use unsigned comparison to handle
- // negative keys.
- __ ldr(scratch2, FieldMemOperand(scratch1, FixedArray::kLengthOffset));
- __ cmp(scratch2, key);
- deferred->Branch(ls); // Unsigned less equal.
-
- // Load and check that the result is not the hole (key is a smi).
- __ LoadRoot(scratch2, Heap::kTheHoleValueRootIndex);
- __ add(scratch1,
- scratch1,
- Operand(FixedArray::kHeaderSize - kHeapObjectTag));
- __ ldr(scratch1,
- MemOperand(scratch1, key, LSL,
- kPointerSizeLog2 - (kSmiTagSize + kSmiShiftSize)));
- __ cmp(scratch1, scratch2);
- deferred->Branch(eq);
-
- __ mov(r0, scratch1);
- // Make sure that the expected number of instructions are generated.
- ASSERT_EQ(GetInlinedKeyedLoadInstructionsAfterPatch(),
- masm_->InstructionsGeneratedSince(&check_inlined_codesize));
- }
-
- deferred->BindExit();
- }
-}
-
-
-void CodeGenerator::EmitKeyedStore(StaticType* key_type,
- WriteBarrierCharacter wb_info) {
- // Generate inlined version of the keyed store if the code is in a loop
- // and the key is likely to be a smi.
- if (loop_nesting() > 0 && key_type->IsLikelySmi()) {
- // Inline the keyed store.
- Comment cmnt(masm_, "[ Inlined store to keyed property");
-
- Register scratch1 = VirtualFrame::scratch0();
- Register scratch2 = VirtualFrame::scratch1();
- Register scratch3 = r3;
-
- // Counter will be decremented in the deferred code. Placed here to avoid
- // having it in the instruction stream below where patching will occur.
- __ IncrementCounter(masm_->isolate()->counters()->keyed_store_inline(),
- 1, scratch1, scratch2);
-
-
- // Load the value, key and receiver from the stack.
- bool value_is_harmless = frame_->KnownSmiAt(0);
- if (wb_info == NEVER_NEWSPACE) value_is_harmless = true;
- bool key_is_smi = frame_->KnownSmiAt(1);
- Register value = frame_->PopToRegister();
- Register key = frame_->PopToRegister(value);
- VirtualFrame::SpilledScope spilled(frame_);
- Register receiver = r2;
- frame_->EmitPop(receiver);
-
-#ifdef DEBUG
- bool we_remembered_the_write_barrier = value_is_harmless;
-#endif
-
- // The deferred code expects value, key and receiver in registers.
- DeferredReferenceSetKeyedValue* deferred =
- new DeferredReferenceSetKeyedValue(
- value, key, receiver, strict_mode_flag());
-
- // Check that the value is a smi. As this inlined code does not set the
- // write barrier it is only possible to store smi values.
- if (!value_is_harmless) {
- // If the value is not likely to be a Smi then let's test the fixed array
- // for new space instead. See below.
- if (wb_info == LIKELY_SMI) {
- __ tst(value, Operand(kSmiTagMask));
- deferred->Branch(ne);
-#ifdef DEBUG
- we_remembered_the_write_barrier = true;
-#endif
- }
- }
-
- if (!key_is_smi) {
- // Check that the key is a smi.
- __ tst(key, Operand(kSmiTagMask));
- deferred->Branch(ne);
- }
-
- // Check that the receiver is a heap object.
- __ tst(receiver, Operand(kSmiTagMask));
- deferred->Branch(eq);
-
- // Check that the receiver is a JSArray.
- __ CompareObjectType(receiver, scratch1, scratch1, JS_ARRAY_TYPE);
- deferred->Branch(ne);
-
- // Get the elements array from the receiver.
- __ ldr(scratch1, FieldMemOperand(receiver, JSObject::kElementsOffset));
- if (!value_is_harmless && wb_info != LIKELY_SMI) {
- Label ok;
- __ and_(scratch2,
- scratch1,
- Operand(ExternalReference::new_space_mask(isolate())));
- __ cmp(scratch2, Operand(ExternalReference::new_space_start(isolate())));
- __ tst(value, Operand(kSmiTagMask), ne);
- deferred->Branch(ne);
-#ifdef DEBUG
- we_remembered_the_write_barrier = true;
-#endif
- }
- // Check that the elements array is not a dictionary.
- __ ldr(scratch2, FieldMemOperand(scratch1, JSObject::kMapOffset));
-
- // The following instructions are the part of the inlined store keyed
- // property code which can be patched. Therefore the exact number of
- // instructions generated need to be fixed, so the constant pool is blocked
- // while generating this code.
- { Assembler::BlockConstPoolScope block_const_pool(masm_);
-#ifdef DEBUG
- Label check_inlined_codesize;
- masm_->bind(&check_inlined_codesize);
-#endif
-
- // Read the fixed array map from the constant pool (not from the root
- // array) so that the value can be patched. When debugging, we patch this
- // comparison to always fail so that we will hit the IC call in the
- // deferred code which will allow the debugger to break for fast case
- // stores.
- __ mov(scratch3, Operand(FACTORY->fixed_array_map()));
- __ cmp(scratch2, scratch3);
- deferred->Branch(ne);
-
- // Check that the key is within bounds. Both the key and the length of
- // the JSArray are smis (because the fixed array check above ensures the
- // elements are in fast case). Use unsigned comparison to handle negative
- // keys.
- __ ldr(scratch3, FieldMemOperand(receiver, JSArray::kLengthOffset));
- __ cmp(scratch3, key);
- deferred->Branch(ls); // Unsigned less equal.
-
- // Store the value.
- __ add(scratch1, scratch1,
- Operand(FixedArray::kHeaderSize - kHeapObjectTag));
- __ str(value,
- MemOperand(scratch1, key, LSL,
- kPointerSizeLog2 - (kSmiTagSize + kSmiShiftSize)));
-
- // Make sure that the expected number of instructions are generated.
- ASSERT_EQ(kInlinedKeyedStoreInstructionsAfterPatch,
- masm_->InstructionsGeneratedSince(&check_inlined_codesize));
- }
-
- ASSERT(we_remembered_the_write_barrier);
-
- deferred->BindExit();
- } else {
- frame()->CallKeyedStoreIC(strict_mode_flag());
- }
-}
-
-
-#ifdef DEBUG
-bool CodeGenerator::HasValidEntryRegisters() { return true; }
-#endif
-
-
-#undef __
-#define __ ACCESS_MASM(masm)
-
-Handle<String> Reference::GetName() {
- ASSERT(type_ == NAMED);
- Property* property = expression_->AsProperty();
- if (property == NULL) {
- // Global variable reference treated as a named property reference.
- VariableProxy* proxy = expression_->AsVariableProxy();
- ASSERT(proxy->AsVariable() != NULL);
- ASSERT(proxy->AsVariable()->is_global());
- return proxy->name();
- } else {
- Literal* raw_name = property->key()->AsLiteral();
- ASSERT(raw_name != NULL);
- return Handle<String>(String::cast(*raw_name->handle()));
- }
-}
-
-
-void Reference::DupIfPersist() {
- if (persist_after_get_) {
- switch (type_) {
- case KEYED:
- cgen_->frame()->Dup2();
- break;
- case NAMED:
- cgen_->frame()->Dup();
- // Fall through.
- case UNLOADED:
- case ILLEGAL:
- case SLOT:
- // Do nothing.
- ;
- }
- } else {
- set_unloaded();
- }
-}
-
-
-void Reference::GetValue() {
- ASSERT(cgen_->HasValidEntryRegisters());
- ASSERT(!is_illegal());
- ASSERT(!cgen_->has_cc());
- MacroAssembler* masm = cgen_->masm();
- Property* property = expression_->AsProperty();
- if (property != NULL) {
- cgen_->CodeForSourcePosition(property->position());
- }
-
- switch (type_) {
- case SLOT: {
- Comment cmnt(masm, "[ Load from Slot");
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- DupIfPersist();
- cgen_->LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
- break;
- }
-
- case NAMED: {
- Variable* var = expression_->AsVariableProxy()->AsVariable();
- bool is_global = var != NULL;
- ASSERT(!is_global || var->is_global());
- Handle<String> name = GetName();
- DupIfPersist();
- cgen_->EmitNamedLoad(name, is_global);
- break;
- }
-
- case KEYED: {
- ASSERT(property != NULL);
- DupIfPersist();
- cgen_->EmitKeyedLoad();
- cgen_->frame()->EmitPush(r0);
- break;
- }
-
- default:
- UNREACHABLE();
- }
-}
-
-
-void Reference::SetValue(InitState init_state, WriteBarrierCharacter wb_info) {
- ASSERT(!is_illegal());
- ASSERT(!cgen_->has_cc());
- MacroAssembler* masm = cgen_->masm();
- VirtualFrame* frame = cgen_->frame();
- Property* property = expression_->AsProperty();
- if (property != NULL) {
- cgen_->CodeForSourcePosition(property->position());
- }
-
- switch (type_) {
- case SLOT: {
- Comment cmnt(masm, "[ Store to Slot");
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- cgen_->StoreToSlot(slot, init_state);
- set_unloaded();
- break;
- }
-
- case NAMED: {
- Comment cmnt(masm, "[ Store to named Property");
- cgen_->EmitNamedStore(GetName(), false);
- frame->EmitPush(r0);
- set_unloaded();
- break;
- }
-
- case KEYED: {
- Comment cmnt(masm, "[ Store to keyed Property");
- Property* property = expression_->AsProperty();
- ASSERT(property != NULL);
- cgen_->CodeForSourcePosition(property->position());
- cgen_->EmitKeyedStore(property->key()->type(), wb_info);
- frame->EmitPush(r0);
- set_unloaded();
- break;
- }
-
- default:
- UNREACHABLE();
- }
-}
-
-
-const char* GenericBinaryOpStub::GetName() {
- if (name_ != NULL) return name_;
- const int len = 100;
- name_ = Isolate::Current()->bootstrapper()->AllocateAutoDeletedArray(len);
- if (name_ == NULL) return "OOM";
- const char* op_name = Token::Name(op_);
- const char* overwrite_name;
- switch (mode_) {
- case NO_OVERWRITE: overwrite_name = "Alloc"; break;
- case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break;
- case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break;
- default: overwrite_name = "UnknownOverwrite"; break;
- }
-
- OS::SNPrintF(Vector<char>(name_, len),
- "GenericBinaryOpStub_%s_%s%s_%s",
- op_name,
- overwrite_name,
- specialized_on_rhs_ ? "_ConstantRhs" : "",
- BinaryOpIC::GetName(runtime_operands_type_));
- return name_;
-}
-
-#undef __
-
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_ARM
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// Forward declarations
class CompilationInfo;
-class DeferredCode;
-class JumpTarget;
-class RegisterAllocator;
-class RegisterFile;
-enum InitState { CONST_INIT, NOT_CONST_INIT };
enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
-enum GenerateInlineSmi { DONT_GENERATE_INLINE_SMI, GENERATE_INLINE_SMI };
-enum WriteBarrierCharacter { UNLIKELY_SMI, LIKELY_SMI, NEVER_NEWSPACE };
-
-
-// -------------------------------------------------------------------------
-// Reference support
-
-// A reference is a C++ stack-allocated object that puts a
-// reference on the virtual frame. The reference may be consumed
-// by GetValue, TakeValue, SetValue, and Codegen::UnloadReference.
-// When the lifetime (scope) of a valid reference ends, it must have
-// been consumed, and be in state UNLOADED.
-class Reference BASE_EMBEDDED {
- public:
- // The values of the types is important, see size().
- enum Type { UNLOADED = -2, ILLEGAL = -1, SLOT = 0, NAMED = 1, KEYED = 2 };
- Reference(CodeGenerator* cgen,
- Expression* expression,
- bool persist_after_get = false);
- ~Reference();
-
- Expression* expression() const { return expression_; }
- Type type() const { return type_; }
- void set_type(Type value) {
- ASSERT_EQ(ILLEGAL, type_);
- type_ = value;
- }
-
- void set_unloaded() {
- ASSERT_NE(ILLEGAL, type_);
- ASSERT_NE(UNLOADED, type_);
- type_ = UNLOADED;
- }
- // The size the reference takes up on the stack.
- int size() const {
- return (type_ < SLOT) ? 0 : type_;
- }
-
- bool is_illegal() const { return type_ == ILLEGAL; }
- bool is_slot() const { return type_ == SLOT; }
- bool is_property() const { return type_ == NAMED || type_ == KEYED; }
- bool is_unloaded() const { return type_ == UNLOADED; }
-
- // Return the name. Only valid for named property references.
- Handle<String> GetName();
-
- // Generate code to push the value of the reference on top of the
- // expression stack. The reference is expected to be already on top of
- // the expression stack, and it is consumed by the call unless the
- // reference is for a compound assignment.
- // If the reference is not consumed, it is left in place under its value.
- void GetValue();
-
- // Generate code to store the value on top of the expression stack in the
- // reference. The reference is expected to be immediately below the value
- // on the expression stack. The value is stored in the location specified
- // by the reference, and is left on top of the stack, after the reference
- // is popped from beneath it (unloaded).
- void SetValue(InitState init_state, WriteBarrierCharacter wb);
-
- // This is in preparation for something that uses the reference on the stack.
- // If we need this reference afterwards get then dup it now. Otherwise mark
- // it as used.
- inline void DupIfPersist();
-
- private:
- CodeGenerator* cgen_;
- Expression* expression_;
- Type type_;
- // Keep the reference on the stack after get, so it can be used by set later.
- bool persist_after_get_;
-};
-
-
-// -------------------------------------------------------------------------
-// Code generation state
-
-// The state is passed down the AST by the code generator (and back up, in
-// the form of the state of the label pair). It is threaded through the
-// call stack. Constructing a state implicitly pushes it on the owning code
-// generator's stack of states, and destroying one implicitly pops it.
-
-class CodeGenState BASE_EMBEDDED {
- public:
- // Create an initial code generator state. Destroying the initial state
- // leaves the code generator with a NULL state.
- explicit CodeGenState(CodeGenerator* owner);
-
- // Destroy a code generator state and restore the owning code generator's
- // previous state.
- virtual ~CodeGenState();
-
- virtual JumpTarget* true_target() const { return NULL; }
- virtual JumpTarget* false_target() const { return NULL; }
-
- protected:
- inline CodeGenerator* owner() { return owner_; }
- inline CodeGenState* previous() const { return previous_; }
-
- private:
- CodeGenerator* owner_;
- CodeGenState* previous_;
-};
-
-
-class ConditionCodeGenState : public CodeGenState {
- public:
- // Create a code generator state based on a code generator's current
- // state. The new state has its own pair of branch labels.
- ConditionCodeGenState(CodeGenerator* owner,
- JumpTarget* true_target,
- JumpTarget* false_target);
-
- virtual JumpTarget* true_target() const { return true_target_; }
- virtual JumpTarget* false_target() const { return false_target_; }
-
- private:
- JumpTarget* true_target_;
- JumpTarget* false_target_;
-};
-
-
-class TypeInfoCodeGenState : public CodeGenState {
- public:
- TypeInfoCodeGenState(CodeGenerator* owner,
- Slot* slot_number,
- TypeInfo info);
- ~TypeInfoCodeGenState();
-
- virtual JumpTarget* true_target() const { return previous()->true_target(); }
- virtual JumpTarget* false_target() const {
- return previous()->false_target();
- }
-
- private:
- Slot* slot_;
- TypeInfo old_type_info_;
-};
-
-
-// -------------------------------------------------------------------------
-// Arguments allocation mode
-
-enum ArgumentsAllocationMode {
- NO_ARGUMENTS_ALLOCATION,
- EAGER_ARGUMENTS_ALLOCATION,
- LAZY_ARGUMENTS_ALLOCATION
-};
-
// -------------------------------------------------------------------------
// CodeGenerator
int pos,
bool right_here = false);
- // Accessors
- MacroAssembler* masm() { return masm_; }
- VirtualFrame* frame() const { return frame_; }
- inline Handle<Script> script();
-
- bool has_valid_frame() const { return frame_ != NULL; }
-
- // Set the virtual frame to be new_frame, with non-frame register
- // reference counts given by non_frame_registers. The non-frame
- // register reference counts of the old frame are returned in
- // non_frame_registers.
- void SetFrame(VirtualFrame* new_frame, RegisterFile* non_frame_registers);
-
- void DeleteFrame();
-
- RegisterAllocator* allocator() const { return allocator_; }
-
- CodeGenState* state() { return state_; }
- void set_state(CodeGenState* state) { state_ = state; }
-
- TypeInfo type_info(Slot* slot) {
- int index = NumberOfSlot(slot);
- if (index == kInvalidSlotNumber) return TypeInfo::Unknown();
- return (*type_info_)[index];
- }
-
- TypeInfo set_type_info(Slot* slot, TypeInfo info) {
- int index = NumberOfSlot(slot);
- ASSERT(index >= kInvalidSlotNumber);
- if (index != kInvalidSlotNumber) {
- TypeInfo previous_value = (*type_info_)[index];
- (*type_info_)[index] = info;
- return previous_value;
- }
- return TypeInfo::Unknown();
- }
-
- void AddDeferred(DeferredCode* code) { deferred_.Add(code); }
-
// Constants related to patching of inlined load/store.
static int GetInlinedKeyedLoadInstructionsAfterPatch() {
return FLAG_debug_code ? 32 : 13;
}
private:
- // Type of a member function that generates inline code for a native function.
- typedef void (CodeGenerator::*InlineFunctionGenerator)
- (ZoneList<Expression*>*);
-
- static const InlineFunctionGenerator kInlineFunctionGenerators[];
-
- // Construction/Destruction
- explicit CodeGenerator(MacroAssembler* masm);
-
- // Accessors
- inline bool is_eval();
- inline Scope* scope();
- inline bool is_strict_mode();
- inline StrictModeFlag strict_mode_flag();
-
- // Generating deferred code.
- void ProcessDeferred();
-
- static const int kInvalidSlotNumber = -1;
-
- int NumberOfSlot(Slot* slot);
-
- // State
- bool has_cc() const { return cc_reg_ != al; }
- JumpTarget* true_target() const { return state_->true_target(); }
- JumpTarget* false_target() const { return state_->false_target(); }
-
- // Track loop nesting level.
- int loop_nesting() const { return loop_nesting_; }
- void IncrementLoopNesting() { loop_nesting_++; }
- void DecrementLoopNesting() { loop_nesting_--; }
-
- // Node visitors.
- void VisitStatements(ZoneList<Statement*>* statements);
-
- virtual void VisitSlot(Slot* node);
-#define DEF_VISIT(type) \
- virtual void Visit##type(type* node);
- AST_NODE_LIST(DEF_VISIT)
-#undef DEF_VISIT
-
- // Main code generation function
- void Generate(CompilationInfo* info);
-
- // Generate the return sequence code. Should be called no more than
- // once per compiled function, immediately after binding the return
- // target (which can not be done more than once). The return value should
- // be in r0.
- void GenerateReturnSequence();
-
- // Returns the arguments allocation mode.
- ArgumentsAllocationMode ArgumentsMode();
-
- // Store the arguments object and allocate it if necessary.
- void StoreArgumentsObject(bool initial);
-
- // The following are used by class Reference.
- void LoadReference(Reference* ref);
- void UnloadReference(Reference* ref);
-
- MemOperand SlotOperand(Slot* slot, Register tmp);
-
- MemOperand ContextSlotOperandCheckExtensions(Slot* slot,
- Register tmp,
- Register tmp2,
- JumpTarget* slow);
-
- // Expressions
- void LoadCondition(Expression* x,
- JumpTarget* true_target,
- JumpTarget* false_target,
- bool force_cc);
- void Load(Expression* expr);
- void LoadGlobal();
- void LoadGlobalReceiver(Register scratch);
-
- // Read a value from a slot and leave it on top of the expression stack.
- void LoadFromSlot(Slot* slot, TypeofState typeof_state);
- void LoadFromSlotCheckForArguments(Slot* slot, TypeofState state);
-
- // Store the value on top of the stack to a slot.
- void StoreToSlot(Slot* slot, InitState init_state);
-
- // Support for compiling assignment expressions.
- void EmitSlotAssignment(Assignment* node);
- void EmitNamedPropertyAssignment(Assignment* node);
- void EmitKeyedPropertyAssignment(Assignment* node);
-
- // Load a named property, returning it in r0. The receiver is passed on the
- // stack, and remains there.
- void EmitNamedLoad(Handle<String> name, bool is_contextual);
-
- // Store to a named property. If the store is contextual, value is passed on
- // the frame and consumed. Otherwise, receiver and value are passed on the
- // frame and consumed. The result is returned in r0.
- void EmitNamedStore(Handle<String> name, bool is_contextual);
-
- // Load a keyed property, leaving it in r0. The receiver and key are
- // passed on the stack, and remain there.
- void EmitKeyedLoad();
-
- // Store a keyed property. Key and receiver are on the stack and the value is
- // in r0. Result is returned in r0.
- void EmitKeyedStore(StaticType* key_type, WriteBarrierCharacter wb_info);
-
- void LoadFromGlobalSlotCheckExtensions(Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow);
-
- // Support for loading from local/global variables and arguments
- // whose location is known unless they are shadowed by
- // eval-introduced bindings. Generates no code for unsupported slot
- // types and therefore expects to fall through to the slow jump target.
- void EmitDynamicLoadFromSlotFastCase(Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow,
- JumpTarget* done);
-
- // Special code for typeof expressions: Unfortunately, we must
- // be careful when loading the expression in 'typeof'
- // expressions. We are not allowed to throw reference errors for
- // non-existing properties of the global object, so we must make it
- // look like an explicit property access, instead of an access
- // through the context chain.
- void LoadTypeofExpression(Expression* x);
-
- void ToBoolean(JumpTarget* true_target, JumpTarget* false_target);
-
- // Generate code that computes a shortcutting logical operation.
- void GenerateLogicalBooleanOperation(BinaryOperation* node);
-
- void GenericBinaryOperation(Token::Value op,
- OverwriteMode overwrite_mode,
- GenerateInlineSmi inline_smi,
- int known_rhs =
- GenericBinaryOpStub::kUnknownIntValue);
- void Comparison(Condition cc,
- Expression* left,
- Expression* right,
- bool strict = false);
-
- void SmiOperation(Token::Value op,
- Handle<Object> value,
- bool reversed,
- OverwriteMode mode);
-
- void CallWithArguments(ZoneList<Expression*>* arguments,
- CallFunctionFlags flags,
- int position);
-
- // An optimized implementation of expressions of the form
- // x.apply(y, arguments). We call x the applicand and y the receiver.
- // The optimization avoids allocating an arguments object if possible.
- void CallApplyLazy(Expression* applicand,
- Expression* receiver,
- VariableProxy* arguments,
- int position);
-
- // Control flow
- void Branch(bool if_true, JumpTarget* target);
- void CheckStack();
-
- bool CheckForInlineRuntimeCall(CallRuntime* node);
-
- static Handle<Code> ComputeLazyCompile(int argc);
- void ProcessDeclarations(ZoneList<Declaration*>* declarations);
-
- // Declare global variables and functions in the given array of
- // name/value pairs.
- void DeclareGlobals(Handle<FixedArray> pairs);
-
- // Instantiate the function based on the shared function info.
- void InstantiateFunction(Handle<SharedFunctionInfo> function_info,
- bool pretenure);
-
- // Support for type checks.
- void GenerateIsSmi(ZoneList<Expression*>* args);
- void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
- void GenerateIsArray(ZoneList<Expression*>* args);
- void GenerateIsRegExp(ZoneList<Expression*>* args);
- void GenerateIsObject(ZoneList<Expression*>* args);
- void GenerateIsSpecObject(ZoneList<Expression*>* args);
- void GenerateIsFunction(ZoneList<Expression*>* args);
- void GenerateIsUndetectableObject(ZoneList<Expression*>* args);
- void GenerateIsStringWrapperSafeForDefaultValueOf(
- ZoneList<Expression*>* args);
-
- // Support for construct call checks.
- void GenerateIsConstructCall(ZoneList<Expression*>* args);
-
- // Support for arguments.length and arguments[?].
- void GenerateArgumentsLength(ZoneList<Expression*>* args);
- void GenerateArguments(ZoneList<Expression*>* args);
-
- // Support for accessing the class and value fields of an object.
- void GenerateClassOf(ZoneList<Expression*>* args);
- void GenerateValueOf(ZoneList<Expression*>* args);
- void GenerateSetValueOf(ZoneList<Expression*>* args);
-
- // Fast support for charCodeAt(n).
- void GenerateStringCharCodeAt(ZoneList<Expression*>* args);
-
- // Fast support for string.charAt(n) and string[n].
- void GenerateStringCharFromCode(ZoneList<Expression*>* args);
-
- // Fast support for string.charAt(n) and string[n].
- void GenerateStringCharAt(ZoneList<Expression*>* args);
-
- // Fast support for object equality testing.
- void GenerateObjectEquals(ZoneList<Expression*>* args);
-
- void GenerateLog(ZoneList<Expression*>* args);
-
- // Fast support for Math.random().
- void GenerateRandomHeapNumber(ZoneList<Expression*>* args);
-
- // Fast support for StringAdd.
- void GenerateStringAdd(ZoneList<Expression*>* args);
-
- // Fast support for SubString.
- void GenerateSubString(ZoneList<Expression*>* args);
-
- // Fast support for StringCompare.
- void GenerateStringCompare(ZoneList<Expression*>* args);
-
- // Support for direct calls from JavaScript to native RegExp code.
- void GenerateRegExpExec(ZoneList<Expression*>* args);
-
- void GenerateRegExpConstructResult(ZoneList<Expression*>* args);
-
- // Support for fast native caches.
- void GenerateGetFromCache(ZoneList<Expression*>* args);
-
- // Fast support for number to string.
- void GenerateNumberToString(ZoneList<Expression*>* args);
-
- // Fast swapping of elements.
- void GenerateSwapElements(ZoneList<Expression*>* args);
-
- // Fast call for custom callbacks.
- void GenerateCallFunction(ZoneList<Expression*>* args);
-
- // Fast call to math functions.
- void GenerateMathPow(ZoneList<Expression*>* args);
- void GenerateMathSin(ZoneList<Expression*>* args);
- void GenerateMathCos(ZoneList<Expression*>* args);
- void GenerateMathSqrt(ZoneList<Expression*>* args);
- void GenerateMathLog(ZoneList<Expression*>* args);
-
- void GenerateIsRegExpEquivalent(ZoneList<Expression*>* args);
-
- void GenerateHasCachedArrayIndex(ZoneList<Expression*>* args);
- void GenerateGetCachedArrayIndex(ZoneList<Expression*>* args);
- void GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args);
-
- // Simple condition analysis.
- enum ConditionAnalysis {
- ALWAYS_TRUE,
- ALWAYS_FALSE,
- DONT_KNOW
- };
- ConditionAnalysis AnalyzeCondition(Expression* cond);
-
- // Methods used to indicate which source code is generated for. Source
- // positions are collected by the assembler and emitted with the relocation
- // information.
- void CodeForFunctionPosition(FunctionLiteral* fun);
- void CodeForReturnPosition(FunctionLiteral* fun);
- void CodeForStatementPosition(Statement* node);
- void CodeForDoWhileConditionPosition(DoWhileStatement* stmt);
- void CodeForSourcePosition(int pos);
-
-#ifdef DEBUG
- // True if the registers are valid for entry to a block.
- bool HasValidEntryRegisters();
-#endif
-
- List<DeferredCode*> deferred_;
-
- // Assembler
- MacroAssembler* masm_; // to generate code
-
- CompilationInfo* info_;
-
- // Code generation state
- VirtualFrame* frame_;
- RegisterAllocator* allocator_;
- Condition cc_reg_;
- CodeGenState* state_;
- int loop_nesting_;
-
- Vector<TypeInfo>* type_info_;
-
- // Jump targets
- BreakTarget function_return_;
-
- // True if the function return is shadowed (ie, jumping to the target
- // function_return_ does not jump to the true function return, but rather
- // to some unlinking code).
- bool function_return_is_shadowed_;
-
- friend class VirtualFrame;
- friend class Isolate;
- friend class JumpTarget;
- friend class Reference;
- friend class FastCodeGenerator;
- friend class FullCodeGenerator;
- friend class FullCodeGenSyntaxChecker;
- friend class InlineRuntimeFunctionsTable;
- friend class LCodeGen;
-
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_ARM)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
namespace v8 {
#if defined(V8_TARGET_ARCH_ARM)
#include "code-stubs.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compiler.h"
#include "debug.h"
#include "full-codegen.h"
// Compile all the tests with branches to their bodies.
for (int i = 0; i < clauses->length(); i++) {
CaseClause* clause = clauses->at(i);
- clause->body_target()->entry_label()->Unuse();
+ clause->body_target()->Unuse();
// The default is not a test, but remember it as final fall through.
if (clause->is_default()) {
__ cmp(r1, r0);
__ b(ne, &next_test);
__ Drop(1); // Switch value is no longer needed.
- __ b(clause->body_target()->entry_label());
+ __ b(clause->body_target());
__ bind(&slow_case);
}
__ cmp(r0, Operand(0));
__ b(ne, &next_test);
__ Drop(1); // Switch value is no longer needed.
- __ b(clause->body_target()->entry_label());
+ __ b(clause->body_target());
}
// Discard the test value and jump to the default if present, otherwise to
if (default_clause == NULL) {
__ b(nested_statement.break_target());
} else {
- __ b(default_clause->body_target()->entry_label());
+ __ b(default_clause->body_target());
}
// Compile all the case bodies.
for (int i = 0; i < clauses->length(); i++) {
Comment cmnt(masm_, "[ Case body");
CaseClause* clause = clauses->at(i);
- __ bind(clause->body_target()->entry_label());
+ __ bind(clause->body_target());
PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
VisitStatements(clause->statements());
}
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "assembler-arm.h"
#include "code-stubs.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "disasm.h"
#include "ic-inl.h"
#include "runtime.h"
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_ARM)
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// JumpTarget implementation.
-
-#define __ ACCESS_MASM(cgen()->masm())
-
-void JumpTarget::DoJump() {
- ASSERT(cgen()->has_valid_frame());
- // Live non-frame registers are not allowed at unconditional jumps
- // because we have no way of invalidating the corresponding results
- // which are still live in the C++ code.
- ASSERT(cgen()->HasValidEntryRegisters());
-
- if (entry_frame_set_) {
- if (entry_label_.is_bound()) {
- // If we already bound and generated code at the destination then it
- // is too late to ask for less optimistic type assumptions.
- ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
- }
- // There already a frame expectation at the target.
- cgen()->frame()->MergeTo(&entry_frame_);
- cgen()->DeleteFrame();
- } else {
- // Clone the current frame to use as the expected one at the target.
- set_entry_frame(cgen()->frame());
- // Zap the fall-through frame since the jump was unconditional.
- RegisterFile empty;
- cgen()->SetFrame(NULL, &empty);
- }
- if (entry_label_.is_bound()) {
- // You can't jump backwards to an already bound label unless you admitted
- // up front that this was a bidirectional jump target. Bidirectional jump
- // targets will zap their type info when bound in case some later virtual
- // frame with less precise type info branches to them.
- ASSERT(direction_ != FORWARD_ONLY);
- }
- __ jmp(&entry_label_);
-}
-
-
-void JumpTarget::DoBranch(Condition cond, Hint ignored) {
- ASSERT(cgen()->has_valid_frame());
-
- if (entry_frame_set_) {
- if (entry_label_.is_bound()) {
- // If we already bound and generated code at the destination then it
- // is too late to ask for less optimistic type assumptions.
- ASSERT(entry_frame_.IsCompatibleWith(cgen()->frame()));
- }
- // We have an expected frame to merge to on the backward edge.
- cgen()->frame()->MergeTo(&entry_frame_, cond);
- } else {
- // Clone the current frame to use as the expected one at the target.
- set_entry_frame(cgen()->frame());
- }
- if (entry_label_.is_bound()) {
- // You can't branch backwards to an already bound label unless you admitted
- // up front that this was a bidirectional jump target. Bidirectional jump
- // targets will zap their type info when bound in case some later virtual
- // frame with less precise type info branches to them.
- ASSERT(direction_ != FORWARD_ONLY);
- }
- __ b(cond, &entry_label_);
- if (cond == al) {
- cgen()->DeleteFrame();
- }
-}
-
-
-void JumpTarget::Call() {
- // Call is used to push the address of the catch block on the stack as
- // a return address when compiling try/catch and try/finally. We
- // fully spill the frame before making the call. The expected frame
- // at the label (which should be the only one) is the spilled current
- // frame plus an in-memory return address. The "fall-through" frame
- // at the return site is the spilled current frame.
- ASSERT(cgen()->has_valid_frame());
- // There are no non-frame references across the call.
- ASSERT(cgen()->HasValidEntryRegisters());
- ASSERT(!is_linked());
-
- // Calls are always 'forward' so we use a copy of the current frame (plus
- // one for a return address) as the expected frame.
- ASSERT(!entry_frame_set_);
- VirtualFrame target_frame = *cgen()->frame();
- target_frame.Adjust(1);
- set_entry_frame(&target_frame);
-
- __ bl(&entry_label_);
-}
-
-
-void JumpTarget::DoBind() {
- ASSERT(!is_bound());
-
- // Live non-frame registers are not allowed at the start of a basic
- // block.
- ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
-
- if (cgen()->has_valid_frame()) {
- if (direction_ != FORWARD_ONLY) cgen()->frame()->ForgetTypeInfo();
- // If there is a current frame we can use it on the fall through.
- if (!entry_frame_set_) {
- entry_frame_ = *cgen()->frame();
- entry_frame_set_ = true;
- } else {
- cgen()->frame()->MergeTo(&entry_frame_);
- // On fall through we may have to merge both ways.
- if (direction_ != FORWARD_ONLY) {
- // This will not need to adjust the virtual frame entries that are
- // register allocated since that was done above and they now match.
- // But it does need to adjust the entry_frame_ of this jump target
- // to make it potentially less optimistic. Later code can branch back
- // to this jump target and we need to assert that that code does not
- // have weaker assumptions about types.
- entry_frame_.MergeTo(cgen()->frame());
- }
- }
- } else {
- // If there is no current frame we must have an entry frame which we can
- // copy.
- ASSERT(entry_frame_set_);
- RegisterFile empty;
- cgen()->SetFrame(new VirtualFrame(&entry_frame_), &empty);
- }
-
- __ bind(&entry_label_);
-}
-
-
-#undef __
-
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_ARM
#if defined(V8_TARGET_ARCH_ARM)
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
#include "runtime.h"
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
-#define V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
-
-#include "v8.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-bool RegisterAllocator::IsReserved(Register reg) {
- return reg.is(cp) || reg.is(fp) || reg.is(sp) || reg.is(pc);
-}
-
-
-
-// The register allocator uses small integers to represent the
-// non-reserved assembler registers. The mapping is:
-//
-// r0 <-> 0
-// r1 <-> 1
-// r2 <-> 2
-// r3 <-> 3
-// r4 <-> 4
-// r5 <-> 5
-// r6 <-> 6
-// r7 <-> 7
-// r9 <-> 8
-// r10 <-> 9
-// ip <-> 10
-// lr <-> 11
-
-int RegisterAllocator::ToNumber(Register reg) {
- ASSERT(reg.is_valid() && !IsReserved(reg));
- const int kNumbers[] = {
- 0, // r0
- 1, // r1
- 2, // r2
- 3, // r3
- 4, // r4
- 5, // r5
- 6, // r6
- 7, // r7
- -1, // cp
- 8, // r9
- 9, // r10
- -1, // fp
- 10, // ip
- -1, // sp
- 11, // lr
- -1 // pc
- };
- return kNumbers[reg.code()];
-}
-
-
-Register RegisterAllocator::ToRegister(int num) {
- ASSERT(num >= 0 && num < kNumRegisters);
- const Register kRegisters[] =
- { r0, r1, r2, r3, r4, r5, r6, r7, r9, r10, ip, lr };
- return kRegisters[num];
-}
-
-
-void RegisterAllocator::Initialize() {
- Reset();
-}
-
-
-} } // namespace v8::internal
-
-#endif // V8_ARM_REGISTER_ALLOCATOR_ARM_INL_H_
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_ARM)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Result implementation.
-
-void Result::ToRegister() {
- UNIMPLEMENTED();
-}
-
-
-void Result::ToRegister(Register target) {
- UNIMPLEMENTED();
-}
-
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
- // No byte registers on ARM.
- UNREACHABLE();
- return Result();
-}
-
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_ARM
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_ARM_REGISTER_ALLOCATOR_ARM_H_
-#define V8_ARM_REGISTER_ALLOCATOR_ARM_H_
-
-namespace v8 {
-namespace internal {
-
-class RegisterAllocatorConstants : public AllStatic {
- public:
- // No registers are currently managed by the register allocator on ARM.
- static const int kNumRegisters = 0;
- static const int kInvalidRegister = -1;
-};
-
-
-} } // namespace v8::internal
-
-#endif // V8_ARM_REGISTER_ALLOCATOR_ARM_H_
-// Copyright 2006-2009 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_ARM)
#include "ic-inl.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "stub-cache.h"
namespace v8 {
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_VIRTUAL_FRAME_ARM_INL_H_
-#define V8_VIRTUAL_FRAME_ARM_INL_H_
-
-#include "assembler-arm.h"
-#include "virtual-frame-arm.h"
-
-namespace v8 {
-namespace internal {
-
-// These VirtualFrame methods should actually be in a virtual-frame-arm-inl.h
-// file if such a thing existed.
-MemOperand VirtualFrame::ParameterAt(int index) {
- // Index -1 corresponds to the receiver.
- ASSERT(-1 <= index); // -1 is the receiver.
- ASSERT(index <= parameter_count());
- return MemOperand(fp, (1 + parameter_count() - index) * kPointerSize);
-}
-
- // The receiver frame slot.
-MemOperand VirtualFrame::Receiver() {
- return ParameterAt(-1);
-}
-
-
-void VirtualFrame::Forget(int count) {
- SpillAll();
- LowerHeight(count);
-}
-
-} } // namespace v8::internal
-
-#endif // V8_VIRTUAL_FRAME_ARM_INL_H_
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_ARM)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "scopes.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm())
-
-void VirtualFrame::PopToR1R0() {
- // Shuffle things around so the top of stack is in r0 and r1.
- MergeTOSTo(R0_R1_TOS);
- // Pop the two registers off the stack so they are detached from the frame.
- LowerHeight(2);
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::PopToR1() {
- // Shuffle things around so the top of stack is only in r1.
- MergeTOSTo(R1_TOS);
- // Pop the register off the stack so it is detached from the frame.
- LowerHeight(1);
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::PopToR0() {
- // Shuffle things around so the top of stack only in r0.
- MergeTOSTo(R0_TOS);
- // Pop the register off the stack so it is detached from the frame.
- LowerHeight(1);
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::MergeTo(const VirtualFrame* expected, Condition cond) {
- if (Equals(expected)) return;
- ASSERT((expected->tos_known_smi_map_ & tos_known_smi_map_) ==
- expected->tos_known_smi_map_);
- ASSERT(expected->IsCompatibleWith(this));
- MergeTOSTo(expected->top_of_stack_state_, cond);
- ASSERT(register_allocation_map_ == expected->register_allocation_map_);
-}
-
-
-void VirtualFrame::MergeTo(VirtualFrame* expected, Condition cond) {
- if (Equals(expected)) return;
- tos_known_smi_map_ &= expected->tos_known_smi_map_;
- MergeTOSTo(expected->top_of_stack_state_, cond);
- ASSERT(register_allocation_map_ == expected->register_allocation_map_);
-}
-
-
-void VirtualFrame::MergeTOSTo(
- VirtualFrame::TopOfStack expected_top_of_stack_state, Condition cond) {
-#define CASE_NUMBER(a, b) ((a) * TOS_STATES + (b))
- switch (CASE_NUMBER(top_of_stack_state_, expected_top_of_stack_state)) {
- case CASE_NUMBER(NO_TOS_REGISTERS, NO_TOS_REGISTERS):
- break;
- case CASE_NUMBER(NO_TOS_REGISTERS, R0_TOS):
- __ pop(r0, cond);
- break;
- case CASE_NUMBER(NO_TOS_REGISTERS, R1_TOS):
- __ pop(r1, cond);
- break;
- case CASE_NUMBER(NO_TOS_REGISTERS, R0_R1_TOS):
- __ pop(r0, cond);
- __ pop(r1, cond);
- break;
- case CASE_NUMBER(NO_TOS_REGISTERS, R1_R0_TOS):
- __ pop(r1, cond);
- __ pop(r0, cond);
- break;
- case CASE_NUMBER(R0_TOS, NO_TOS_REGISTERS):
- __ push(r0, cond);
- break;
- case CASE_NUMBER(R0_TOS, R0_TOS):
- break;
- case CASE_NUMBER(R0_TOS, R1_TOS):
- __ mov(r1, r0, LeaveCC, cond);
- break;
- case CASE_NUMBER(R0_TOS, R0_R1_TOS):
- __ pop(r1, cond);
- break;
- case CASE_NUMBER(R0_TOS, R1_R0_TOS):
- __ mov(r1, r0, LeaveCC, cond);
- __ pop(r0, cond);
- break;
- case CASE_NUMBER(R1_TOS, NO_TOS_REGISTERS):
- __ push(r1, cond);
- break;
- case CASE_NUMBER(R1_TOS, R0_TOS):
- __ mov(r0, r1, LeaveCC, cond);
- break;
- case CASE_NUMBER(R1_TOS, R1_TOS):
- break;
- case CASE_NUMBER(R1_TOS, R0_R1_TOS):
- __ mov(r0, r1, LeaveCC, cond);
- __ pop(r1, cond);
- break;
- case CASE_NUMBER(R1_TOS, R1_R0_TOS):
- __ pop(r0, cond);
- break;
- case CASE_NUMBER(R0_R1_TOS, NO_TOS_REGISTERS):
- __ Push(r1, r0, cond);
- break;
- case CASE_NUMBER(R0_R1_TOS, R0_TOS):
- __ push(r1, cond);
- break;
- case CASE_NUMBER(R0_R1_TOS, R1_TOS):
- __ push(r1, cond);
- __ mov(r1, r0, LeaveCC, cond);
- break;
- case CASE_NUMBER(R0_R1_TOS, R0_R1_TOS):
- break;
- case CASE_NUMBER(R0_R1_TOS, R1_R0_TOS):
- __ Swap(r0, r1, ip, cond);
- break;
- case CASE_NUMBER(R1_R0_TOS, NO_TOS_REGISTERS):
- __ Push(r0, r1, cond);
- break;
- case CASE_NUMBER(R1_R0_TOS, R0_TOS):
- __ push(r0, cond);
- __ mov(r0, r1, LeaveCC, cond);
- break;
- case CASE_NUMBER(R1_R0_TOS, R1_TOS):
- __ push(r0, cond);
- break;
- case CASE_NUMBER(R1_R0_TOS, R0_R1_TOS):
- __ Swap(r0, r1, ip, cond);
- break;
- case CASE_NUMBER(R1_R0_TOS, R1_R0_TOS):
- break;
- default:
- UNREACHABLE();
-#undef CASE_NUMBER
- }
- // A conditional merge will be followed by a conditional branch and the
- // fall-through code will have an unchanged virtual frame state. If the
- // merge is unconditional ('al'ways) then it might be followed by a fall
- // through. We need to update the virtual frame state to match the code we
- // are falling into. The final case is an unconditional merge followed by an
- // unconditional branch, in which case it doesn't matter what we do to the
- // virtual frame state, because the virtual frame will be invalidated.
- if (cond == al) {
- top_of_stack_state_ = expected_top_of_stack_state;
- }
-}
-
-
-void VirtualFrame::Enter() {
- Comment cmnt(masm(), "[ Enter JS frame");
-
-#ifdef DEBUG
- // Verify that r1 contains a JS function. The following code relies
- // on r2 being available for use.
- if (FLAG_debug_code) {
- Label map_check, done;
- __ tst(r1, Operand(kSmiTagMask));
- __ b(ne, &map_check);
- __ stop("VirtualFrame::Enter - r1 is not a function (smi check).");
- __ bind(&map_check);
- __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE);
- __ b(eq, &done);
- __ stop("VirtualFrame::Enter - r1 is not a function (map check).");
- __ bind(&done);
- }
-#endif // DEBUG
-
- // We are about to push four values to the frame.
- Adjust(4);
- __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
- // Adjust FP to point to saved FP.
- __ add(fp, sp, Operand(2 * kPointerSize));
-}
-
-
-void VirtualFrame::Exit() {
- Comment cmnt(masm(), "[ Exit JS frame");
- // Record the location of the JS exit code for patching when setting
- // break point.
- __ RecordJSReturn();
-
- // Drop the execution stack down to the frame pointer and restore the caller
- // frame pointer and return address.
- __ mov(sp, fp);
- __ ldm(ia_w, sp, fp.bit() | lr.bit());
-}
-
-
-void VirtualFrame::AllocateStackSlots() {
- int count = local_count();
- if (count > 0) {
- Comment cmnt(masm(), "[ Allocate space for locals");
- Adjust(count);
- // Initialize stack slots with 'undefined' value.
- __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
- __ LoadRoot(r2, Heap::kStackLimitRootIndex);
- if (count < kLocalVarBound) {
- // For less locals the unrolled loop is more compact.
- for (int i = 0; i < count; i++) {
- __ push(ip);
- }
- } else {
- // For more locals a loop in generated code is more compact.
- Label alloc_locals_loop;
- __ mov(r1, Operand(count));
- __ bind(&alloc_locals_loop);
- __ push(ip);
- __ sub(r1, r1, Operand(1), SetCC);
- __ b(ne, &alloc_locals_loop);
- }
- } else {
- __ LoadRoot(r2, Heap::kStackLimitRootIndex);
- }
- // Check the stack for overflow or a break request.
- masm()->cmp(sp, Operand(r2));
- StackCheckStub stub;
- // Call the stub if lower.
- masm()->mov(ip,
- Operand(reinterpret_cast<intptr_t>(stub.GetCode().location()),
- RelocInfo::CODE_TARGET),
- LeaveCC,
- lo);
- masm()->Call(ip, lo);
-}
-
-
-
-void VirtualFrame::PushReceiverSlotAddress() {
- UNIMPLEMENTED();
-}
-
-
-void VirtualFrame::PushTryHandler(HandlerType type) {
- // Grow the expression stack by handler size less one (the return
- // address in lr is already counted by a call instruction).
- Adjust(kHandlerSize - 1);
- __ PushTryHandler(IN_JAVASCRIPT, type);
-}
-
-
-void VirtualFrame::CallJSFunction(int arg_count) {
- // InvokeFunction requires function in r1.
- PopToR1();
- SpillAll();
-
- // +1 for receiver.
- Forget(arg_count + 1);
- ASSERT(cgen()->HasValidEntryRegisters());
- ParameterCount count(arg_count);
- __ InvokeFunction(r1, count, CALL_FUNCTION);
- // Restore the context.
- __ ldr(cp, Context());
-}
-
-
-void VirtualFrame::CallRuntime(const Runtime::Function* f, int arg_count) {
- SpillAll();
- Forget(arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallRuntime(f, arg_count);
-}
-
-
-void VirtualFrame::CallRuntime(Runtime::FunctionId id, int arg_count) {
- SpillAll();
- Forget(arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallRuntime(id, arg_count);
-}
-
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
-void VirtualFrame::DebugBreak() {
- ASSERT(cgen()->HasValidEntryRegisters());
- __ DebugBreak();
-}
-#endif
-
-
-void VirtualFrame::InvokeBuiltin(Builtins::JavaScript id,
- InvokeJSFlags flags,
- int arg_count) {
- Forget(arg_count);
- __ InvokeBuiltin(id, flags);
-}
-
-
-void VirtualFrame::CallLoadIC(Handle<String> name, RelocInfo::Mode mode) {
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kLoadIC_Initialize));
- PopToR0();
- SpillAll();
- __ mov(r2, Operand(name));
- CallCodeObject(ic, mode, 0);
-}
-
-
-void VirtualFrame::CallStoreIC(Handle<String> name,
- bool is_contextual,
- StrictModeFlag strict_mode) {
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode == kStrictMode) ? Builtins::kStoreIC_Initialize_Strict
- : Builtins::kStoreIC_Initialize));
- PopToR0();
- RelocInfo::Mode mode;
- if (is_contextual) {
- SpillAll();
- __ ldr(r1, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX)));
- mode = RelocInfo::CODE_TARGET_CONTEXT;
- } else {
- EmitPop(r1);
- SpillAll();
- mode = RelocInfo::CODE_TARGET;
- }
- __ mov(r2, Operand(name));
- CallCodeObject(ic, mode, 0);
-}
-
-
-void VirtualFrame::CallKeyedLoadIC() {
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kKeyedLoadIC_Initialize));
- PopToR1R0();
- SpillAll();
- CallCodeObject(ic, RelocInfo::CODE_TARGET, 0);
-}
-
-
-void VirtualFrame::CallKeyedStoreIC(StrictModeFlag strict_mode) {
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict
- : Builtins::kKeyedStoreIC_Initialize));
- PopToR1R0();
- SpillAll();
- EmitPop(r2);
- CallCodeObject(ic, RelocInfo::CODE_TARGET, 0);
-}
-
-
-void VirtualFrame::CallCodeObject(Handle<Code> code,
- RelocInfo::Mode rmode,
- int dropped_args) {
- switch (code->kind()) {
- case Code::CALL_IC:
- case Code::KEYED_CALL_IC:
- case Code::FUNCTION:
- break;
- case Code::KEYED_LOAD_IC:
- case Code::LOAD_IC:
- case Code::KEYED_STORE_IC:
- case Code::STORE_IC:
- ASSERT(dropped_args == 0);
- break;
- case Code::BUILTIN:
- ASSERT(*code == Isolate::Current()->builtins()->builtin(
- Builtins::kJSConstructCall));
- break;
- default:
- UNREACHABLE();
- break;
- }
- Forget(dropped_args);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ Call(code, rmode);
-}
-
-
-// NO_TOS_REGISTERS, R0_TOS, R1_TOS, R1_R0_TOS, R0_R1_TOS.
-const bool VirtualFrame::kR0InUse[TOS_STATES] =
- { false, true, false, true, true };
-const bool VirtualFrame::kR1InUse[TOS_STATES] =
- { false, false, true, true, true };
-const int VirtualFrame::kVirtualElements[TOS_STATES] =
- { 0, 1, 1, 2, 2 };
-const Register VirtualFrame::kTopRegister[TOS_STATES] =
- { r0, r0, r1, r1, r0 };
-const Register VirtualFrame::kBottomRegister[TOS_STATES] =
- { r0, r0, r1, r0, r1 };
-const Register VirtualFrame::kAllocatedRegisters[
- VirtualFrame::kNumberOfAllocatedRegisters] = { r2, r3, r4, r5, r6 };
-// Popping is done by the transition implied by kStateAfterPop. Of course if
-// there were no stack slots allocated to registers then the physical SP must
-// be adjusted.
-const VirtualFrame::TopOfStack VirtualFrame::kStateAfterPop[TOS_STATES] =
- { NO_TOS_REGISTERS, NO_TOS_REGISTERS, NO_TOS_REGISTERS, R0_TOS, R1_TOS };
-// Pushing is done by the transition implied by kStateAfterPush. Of course if
-// the maximum number of registers was already allocated to the top of stack
-// slots then one register must be physically pushed onto the stack.
-const VirtualFrame::TopOfStack VirtualFrame::kStateAfterPush[TOS_STATES] =
- { R0_TOS, R1_R0_TOS, R0_R1_TOS, R0_R1_TOS, R1_R0_TOS };
-
-
-void VirtualFrame::Drop(int count) {
- ASSERT(count >= 0);
- ASSERT(height() >= count);
- // Discard elements from the virtual frame and free any registers.
- int num_virtual_elements = kVirtualElements[top_of_stack_state_];
- while (num_virtual_elements > 0) {
- Pop();
- num_virtual_elements--;
- count--;
- if (count == 0) return;
- }
- if (count == 0) return;
- __ add(sp, sp, Operand(count * kPointerSize));
- LowerHeight(count);
-}
-
-
-void VirtualFrame::Pop() {
- if (top_of_stack_state_ == NO_TOS_REGISTERS) {
- __ add(sp, sp, Operand(kPointerSize));
- } else {
- top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
- }
- LowerHeight(1);
-}
-
-
-void VirtualFrame::EmitPop(Register reg) {
- ASSERT(!is_used(RegisterAllocator::ToNumber(reg)));
- if (top_of_stack_state_ == NO_TOS_REGISTERS) {
- __ pop(reg);
- } else {
- __ mov(reg, kTopRegister[top_of_stack_state_]);
- top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
- }
- LowerHeight(1);
-}
-
-
-void VirtualFrame::SpillAllButCopyTOSToR0() {
- switch (top_of_stack_state_) {
- case NO_TOS_REGISTERS:
- __ ldr(r0, MemOperand(sp, 0));
- break;
- case R0_TOS:
- __ push(r0);
- break;
- case R1_TOS:
- __ push(r1);
- __ mov(r0, r1);
- break;
- case R0_R1_TOS:
- __ Push(r1, r0);
- break;
- case R1_R0_TOS:
- __ Push(r0, r1);
- __ mov(r0, r1);
- break;
- default:
- UNREACHABLE();
- }
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::SpillAllButCopyTOSToR1() {
- switch (top_of_stack_state_) {
- case NO_TOS_REGISTERS:
- __ ldr(r1, MemOperand(sp, 0));
- break;
- case R0_TOS:
- __ push(r0);
- __ mov(r1, r0);
- break;
- case R1_TOS:
- __ push(r1);
- break;
- case R0_R1_TOS:
- __ Push(r1, r0);
- __ mov(r1, r0);
- break;
- case R1_R0_TOS:
- __ Push(r0, r1);
- break;
- default:
- UNREACHABLE();
- }
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-void VirtualFrame::SpillAllButCopyTOSToR1R0() {
- switch (top_of_stack_state_) {
- case NO_TOS_REGISTERS:
- __ ldr(r1, MemOperand(sp, 0));
- __ ldr(r0, MemOperand(sp, kPointerSize));
- break;
- case R0_TOS:
- __ push(r0);
- __ mov(r1, r0);
- __ ldr(r0, MemOperand(sp, kPointerSize));
- break;
- case R1_TOS:
- __ push(r1);
- __ ldr(r0, MemOperand(sp, kPointerSize));
- break;
- case R0_R1_TOS:
- __ Push(r1, r0);
- __ Swap(r0, r1, ip);
- break;
- case R1_R0_TOS:
- __ Push(r0, r1);
- break;
- default:
- UNREACHABLE();
- }
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-Register VirtualFrame::Peek() {
- AssertIsNotSpilled();
- if (top_of_stack_state_ == NO_TOS_REGISTERS) {
- top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
- Register answer = kTopRegister[top_of_stack_state_];
- __ pop(answer);
- return answer;
- } else {
- return kTopRegister[top_of_stack_state_];
- }
-}
-
-
-Register VirtualFrame::Peek2() {
- AssertIsNotSpilled();
- switch (top_of_stack_state_) {
- case NO_TOS_REGISTERS:
- case R0_TOS:
- case R0_R1_TOS:
- MergeTOSTo(R0_R1_TOS);
- return r1;
- case R1_TOS:
- case R1_R0_TOS:
- MergeTOSTo(R1_R0_TOS);
- return r0;
- default:
- UNREACHABLE();
- return no_reg;
- }
-}
-
-
-void VirtualFrame::Dup() {
- if (SpilledScope::is_spilled()) {
- __ ldr(ip, MemOperand(sp, 0));
- __ push(ip);
- } else {
- switch (top_of_stack_state_) {
- case NO_TOS_REGISTERS:
- __ ldr(r0, MemOperand(sp, 0));
- top_of_stack_state_ = R0_TOS;
- break;
- case R0_TOS:
- __ mov(r1, r0);
- // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
- top_of_stack_state_ = R0_R1_TOS;
- break;
- case R1_TOS:
- __ mov(r0, r1);
- // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
- top_of_stack_state_ = R0_R1_TOS;
- break;
- case R0_R1_TOS:
- __ push(r1);
- __ mov(r1, r0);
- // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
- top_of_stack_state_ = R0_R1_TOS;
- break;
- case R1_R0_TOS:
- __ push(r0);
- __ mov(r0, r1);
- // r0 and r1 contains the same value. Prefer state with r0 holding TOS.
- top_of_stack_state_ = R0_R1_TOS;
- break;
- default:
- UNREACHABLE();
- }
- }
- RaiseHeight(1, tos_known_smi_map_ & 1);
-}
-
-
-void VirtualFrame::Dup2() {
- if (SpilledScope::is_spilled()) {
- __ ldr(ip, MemOperand(sp, kPointerSize));
- __ push(ip);
- __ ldr(ip, MemOperand(sp, kPointerSize));
- __ push(ip);
- } else {
- switch (top_of_stack_state_) {
- case NO_TOS_REGISTERS:
- __ ldr(r0, MemOperand(sp, 0));
- __ ldr(r1, MemOperand(sp, kPointerSize));
- top_of_stack_state_ = R0_R1_TOS;
- break;
- case R0_TOS:
- __ push(r0);
- __ ldr(r1, MemOperand(sp, kPointerSize));
- top_of_stack_state_ = R0_R1_TOS;
- break;
- case R1_TOS:
- __ push(r1);
- __ ldr(r0, MemOperand(sp, kPointerSize));
- top_of_stack_state_ = R1_R0_TOS;
- break;
- case R0_R1_TOS:
- __ Push(r1, r0);
- top_of_stack_state_ = R0_R1_TOS;
- break;
- case R1_R0_TOS:
- __ Push(r0, r1);
- top_of_stack_state_ = R1_R0_TOS;
- break;
- default:
- UNREACHABLE();
- }
- }
- RaiseHeight(2, tos_known_smi_map_ & 3);
-}
-
-
-Register VirtualFrame::PopToRegister(Register but_not_to_this_one) {
- ASSERT(but_not_to_this_one.is(r0) ||
- but_not_to_this_one.is(r1) ||
- but_not_to_this_one.is(no_reg));
- LowerHeight(1);
- if (top_of_stack_state_ == NO_TOS_REGISTERS) {
- if (but_not_to_this_one.is(r0)) {
- __ pop(r1);
- return r1;
- } else {
- __ pop(r0);
- return r0;
- }
- } else {
- Register answer = kTopRegister[top_of_stack_state_];
- ASSERT(!answer.is(but_not_to_this_one));
- top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
- return answer;
- }
-}
-
-
-void VirtualFrame::EnsureOneFreeTOSRegister() {
- if (kVirtualElements[top_of_stack_state_] == kMaxTOSRegisters) {
- __ push(kBottomRegister[top_of_stack_state_]);
- top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
- top_of_stack_state_ = kStateAfterPop[top_of_stack_state_];
- }
- ASSERT(kVirtualElements[top_of_stack_state_] != kMaxTOSRegisters);
-}
-
-
-void VirtualFrame::EmitPush(Register reg, TypeInfo info) {
- RaiseHeight(1, info.IsSmi() ? 1 : 0);
- if (reg.is(cp)) {
- // If we are pushing cp then we are about to make a call and things have to
- // be pushed to the physical stack. There's nothing to be gained my moving
- // to a TOS register and then pushing that, we might as well push to the
- // physical stack immediately.
- MergeTOSTo(NO_TOS_REGISTERS);
- __ push(reg);
- return;
- }
- if (SpilledScope::is_spilled()) {
- ASSERT(top_of_stack_state_ == NO_TOS_REGISTERS);
- __ push(reg);
- return;
- }
- if (top_of_stack_state_ == NO_TOS_REGISTERS) {
- if (reg.is(r0)) {
- top_of_stack_state_ = R0_TOS;
- return;
- }
- if (reg.is(r1)) {
- top_of_stack_state_ = R1_TOS;
- return;
- }
- }
- EnsureOneFreeTOSRegister();
- top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
- Register dest = kTopRegister[top_of_stack_state_];
- __ Move(dest, reg);
-}
-
-
-void VirtualFrame::SetElementAt(Register reg, int this_far_down) {
- if (this_far_down < kTOSKnownSmiMapSize) {
- tos_known_smi_map_ &= ~(1 << this_far_down);
- }
- if (this_far_down == 0) {
- Pop();
- Register dest = GetTOSRegister();
- if (dest.is(reg)) {
- // We already popped one item off the top of the stack. If the only
- // free register is the one we were asked to push then we have been
- // asked to push a register that was already in use, which cannot
- // happen. It therefore folows that there are two free TOS registers:
- ASSERT(top_of_stack_state_ == NO_TOS_REGISTERS);
- dest = dest.is(r0) ? r1 : r0;
- }
- __ mov(dest, reg);
- EmitPush(dest);
- } else if (this_far_down == 1) {
- int virtual_elements = kVirtualElements[top_of_stack_state_];
- if (virtual_elements < 2) {
- __ str(reg, ElementAt(this_far_down));
- } else {
- ASSERT(virtual_elements == 2);
- ASSERT(!reg.is(r0));
- ASSERT(!reg.is(r1));
- Register dest = kBottomRegister[top_of_stack_state_];
- __ mov(dest, reg);
- }
- } else {
- ASSERT(this_far_down >= 2);
- ASSERT(kVirtualElements[top_of_stack_state_] <= 2);
- __ str(reg, ElementAt(this_far_down));
- }
-}
-
-
-Register VirtualFrame::GetTOSRegister() {
- if (SpilledScope::is_spilled()) return r0;
-
- EnsureOneFreeTOSRegister();
- return kTopRegister[kStateAfterPush[top_of_stack_state_]];
-}
-
-
-void VirtualFrame::EmitPush(Operand operand, TypeInfo info) {
- RaiseHeight(1, info.IsSmi() ? 1 : 0);
- if (SpilledScope::is_spilled()) {
- __ mov(r0, operand);
- __ push(r0);
- return;
- }
- EnsureOneFreeTOSRegister();
- top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
- __ mov(kTopRegister[top_of_stack_state_], operand);
-}
-
-
-void VirtualFrame::EmitPush(MemOperand operand, TypeInfo info) {
- RaiseHeight(1, info.IsSmi() ? 1 : 0);
- if (SpilledScope::is_spilled()) {
- __ ldr(r0, operand);
- __ push(r0);
- return;
- }
- EnsureOneFreeTOSRegister();
- top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
- __ ldr(kTopRegister[top_of_stack_state_], operand);
-}
-
-
-void VirtualFrame::EmitPushRoot(Heap::RootListIndex index) {
- RaiseHeight(1, 0);
- if (SpilledScope::is_spilled()) {
- __ LoadRoot(r0, index);
- __ push(r0);
- return;
- }
- EnsureOneFreeTOSRegister();
- top_of_stack_state_ = kStateAfterPush[top_of_stack_state_];
- __ LoadRoot(kTopRegister[top_of_stack_state_], index);
-}
-
-
-void VirtualFrame::EmitPushMultiple(int count, int src_regs) {
- ASSERT(SpilledScope::is_spilled());
- Adjust(count);
- __ stm(db_w, sp, src_regs);
-}
-
-
-void VirtualFrame::SpillAll() {
- switch (top_of_stack_state_) {
- case R1_R0_TOS:
- masm()->push(r0);
- // Fall through.
- case R1_TOS:
- masm()->push(r1);
- top_of_stack_state_ = NO_TOS_REGISTERS;
- break;
- case R0_R1_TOS:
- masm()->push(r1);
- // Fall through.
- case R0_TOS:
- masm()->push(r0);
- top_of_stack_state_ = NO_TOS_REGISTERS;
- // Fall through.
- case NO_TOS_REGISTERS:
- break;
- default:
- UNREACHABLE();
- break;
- }
- ASSERT(register_allocation_map_ == 0); // Not yet implemented.
-}
-
-#undef __
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_ARM
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_ARM_VIRTUAL_FRAME_ARM_H_
-#define V8_ARM_VIRTUAL_FRAME_ARM_H_
-
-#include "register-allocator.h"
-
-namespace v8 {
-namespace internal {
-
-// This dummy class is only used to create invalid virtual frames.
-extern class InvalidVirtualFrameInitializer {}* kInvalidVirtualFrameInitializer;
-
-
-// -------------------------------------------------------------------------
-// Virtual frames
-//
-// The virtual frame is an abstraction of the physical stack frame. It
-// encapsulates the parameters, frame-allocated locals, and the expression
-// stack. It supports push/pop operations on the expression stack, as well
-// as random access to the expression stack elements, locals, and
-// parameters.
-
-class VirtualFrame : public ZoneObject {
- public:
- class RegisterAllocationScope;
- // A utility class to introduce a scope where the virtual frame is
- // expected to remain spilled. The constructor spills the code
- // generator's current frame, and keeps it spilled.
- class SpilledScope BASE_EMBEDDED {
- public:
- explicit SpilledScope(VirtualFrame* frame)
- : old_is_spilled_(
- Isolate::Current()->is_virtual_frame_in_spilled_scope()) {
- if (frame != NULL) {
- if (!old_is_spilled_) {
- frame->SpillAll();
- } else {
- frame->AssertIsSpilled();
- }
- }
- Isolate::Current()->set_is_virtual_frame_in_spilled_scope(true);
- }
- ~SpilledScope() {
- Isolate::Current()->set_is_virtual_frame_in_spilled_scope(
- old_is_spilled_);
- }
- static bool is_spilled() {
- return Isolate::Current()->is_virtual_frame_in_spilled_scope();
- }
-
- private:
- int old_is_spilled_;
-
- SpilledScope() { }
-
- friend class RegisterAllocationScope;
- };
-
- class RegisterAllocationScope BASE_EMBEDDED {
- public:
- // A utility class to introduce a scope where the virtual frame
- // is not spilled, ie. where register allocation occurs. Eventually
- // when RegisterAllocationScope is ubiquitous it can be removed
- // along with the (by then unused) SpilledScope class.
- inline explicit RegisterAllocationScope(CodeGenerator* cgen);
- inline ~RegisterAllocationScope();
-
- private:
- CodeGenerator* cgen_;
- bool old_is_spilled_;
-
- RegisterAllocationScope() { }
- };
-
- // An illegal index into the virtual frame.
- static const int kIllegalIndex = -1;
-
- // Construct an initial virtual frame on entry to a JS function.
- inline VirtualFrame();
-
- // Construct an invalid virtual frame, used by JumpTargets.
- inline VirtualFrame(InvalidVirtualFrameInitializer* dummy);
-
- // Construct a virtual frame as a clone of an existing one.
- explicit inline VirtualFrame(VirtualFrame* original);
-
- inline CodeGenerator* cgen() const;
- inline MacroAssembler* masm();
-
- // The number of elements on the virtual frame.
- int element_count() const { return element_count_; }
-
- // The height of the virtual expression stack.
- inline int height() const;
-
- bool is_used(int num) {
- switch (num) {
- case 0: { // r0.
- return kR0InUse[top_of_stack_state_];
- }
- case 1: { // r1.
- return kR1InUse[top_of_stack_state_];
- }
- case 2:
- case 3:
- case 4:
- case 5:
- case 6: { // r2 to r6.
- ASSERT(num - kFirstAllocatedRegister < kNumberOfAllocatedRegisters);
- ASSERT(num >= kFirstAllocatedRegister);
- if ((register_allocation_map_ &
- (1 << (num - kFirstAllocatedRegister))) == 0) {
- return false;
- } else {
- return true;
- }
- }
- default: {
- ASSERT(num < kFirstAllocatedRegister ||
- num >= kFirstAllocatedRegister + kNumberOfAllocatedRegisters);
- return false;
- }
- }
- }
-
- // Add extra in-memory elements to the top of the frame to match an actual
- // frame (eg, the frame after an exception handler is pushed). No code is
- // emitted.
- void Adjust(int count);
-
- // Forget elements from the top of the frame to match an actual frame (eg,
- // the frame after a runtime call). No code is emitted except to bring the
- // frame to a spilled state.
- void Forget(int count);
-
- // Spill all values from the frame to memory.
- void SpillAll();
-
- void AssertIsSpilled() const {
- ASSERT(top_of_stack_state_ == NO_TOS_REGISTERS);
- ASSERT(register_allocation_map_ == 0);
- }
-
- void AssertIsNotSpilled() {
- ASSERT(!SpilledScope::is_spilled());
- }
-
- // Spill all occurrences of a specific register from the frame.
- void Spill(Register reg) {
- UNIMPLEMENTED();
- }
-
- // Spill all occurrences of an arbitrary register if possible. Return the
- // register spilled or no_reg if it was not possible to free any register
- // (ie, they all have frame-external references). Unimplemented.
- Register SpillAnyRegister();
-
- // Make this virtual frame have a state identical to an expected virtual
- // frame. As a side effect, code may be emitted to make this frame match
- // the expected one.
- void MergeTo(VirtualFrame* expected, Condition cond = al);
- void MergeTo(const VirtualFrame* expected, Condition cond = al);
-
- // Checks whether this frame can be branched to by the other frame.
- bool IsCompatibleWith(const VirtualFrame* other) const {
- return (tos_known_smi_map_ & (~other->tos_known_smi_map_)) == 0;
- }
-
- inline void ForgetTypeInfo() {
- tos_known_smi_map_ = 0;
- }
-
- // Detach a frame from its code generator, perhaps temporarily. This
- // tells the register allocator that it is free to use frame-internal
- // registers. Used when the code generator's frame is switched from this
- // one to NULL by an unconditional jump.
- void DetachFromCodeGenerator() {
- }
-
- // (Re)attach a frame to its code generator. This informs the register
- // allocator that the frame-internal register references are active again.
- // Used when a code generator's frame is switched from NULL to this one by
- // binding a label.
- void AttachToCodeGenerator() {
- }
-
- // Emit code for the physical JS entry and exit frame sequences. After
- // calling Enter, the virtual frame is ready for use; and after calling
- // Exit it should not be used. Note that Enter does not allocate space in
- // the physical frame for storing frame-allocated locals.
- void Enter();
- void Exit();
-
- // Prepare for returning from the frame by elements in the virtual frame. This
- // avoids generating unnecessary merge code when jumping to the
- // shared return site. No spill code emitted. Value to return should be in r0.
- inline void PrepareForReturn();
-
- // Number of local variables after when we use a loop for allocating.
- static const int kLocalVarBound = 5;
-
- // Allocate and initialize the frame-allocated locals.
- void AllocateStackSlots();
-
- // The current top of the expression stack as an assembly operand.
- MemOperand Top() {
- AssertIsSpilled();
- return MemOperand(sp, 0);
- }
-
- // An element of the expression stack as an assembly operand.
- MemOperand ElementAt(int index) {
- int adjusted_index = index - kVirtualElements[top_of_stack_state_];
- ASSERT(adjusted_index >= 0);
- return MemOperand(sp, adjusted_index * kPointerSize);
- }
-
- bool KnownSmiAt(int index) {
- if (index >= kTOSKnownSmiMapSize) return false;
- return (tos_known_smi_map_ & (1 << index)) != 0;
- }
-
- // A frame-allocated local as an assembly operand.
- inline MemOperand LocalAt(int index);
-
- // Push the address of the receiver slot on the frame.
- void PushReceiverSlotAddress();
-
- // The function frame slot.
- MemOperand Function() { return MemOperand(fp, kFunctionOffset); }
-
- // The context frame slot.
- MemOperand Context() { return MemOperand(fp, kContextOffset); }
-
- // A parameter as an assembly operand.
- inline MemOperand ParameterAt(int index);
-
- // The receiver frame slot.
- inline MemOperand Receiver();
-
- // Push a try-catch or try-finally handler on top of the virtual frame.
- void PushTryHandler(HandlerType type);
-
- // Call stub given the number of arguments it expects on (and
- // removes from) the stack.
- inline void CallStub(CodeStub* stub, int arg_count);
-
- // Call JS function from top of the stack with arguments
- // taken from the stack.
- void CallJSFunction(int arg_count);
-
- // Call runtime given the number of arguments expected on (and
- // removed from) the stack.
- void CallRuntime(const Runtime::Function* f, int arg_count);
- void CallRuntime(Runtime::FunctionId id, int arg_count);
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
- void DebugBreak();
-#endif
-
- // Invoke builtin given the number of arguments it expects on (and
- // removes from) the stack.
- void InvokeBuiltin(Builtins::JavaScript id,
- InvokeJSFlags flag,
- int arg_count);
-
- // Call load IC. Receiver is on the stack and is consumed. Result is returned
- // in r0.
- void CallLoadIC(Handle<String> name, RelocInfo::Mode mode);
-
- // Call store IC. If the load is contextual, value is found on top of the
- // frame. If not, value and receiver are on the frame. Both are consumed.
- // Result is returned in r0.
- void CallStoreIC(Handle<String> name, bool is_contextual,
- StrictModeFlag strict_mode);
-
- // Call keyed load IC. Key and receiver are on the stack. Both are consumed.
- // Result is returned in r0.
- void CallKeyedLoadIC();
-
- // Call keyed store IC. Value, key and receiver are on the stack. All three
- // are consumed. Result is returned in r0.
- void CallKeyedStoreIC(StrictModeFlag strict_mode);
-
- // Call into an IC stub given the number of arguments it removes
- // from the stack. Register arguments to the IC stub are implicit,
- // and depend on the type of IC stub.
- void CallCodeObject(Handle<Code> ic,
- RelocInfo::Mode rmode,
- int dropped_args);
-
- // Drop a number of elements from the top of the expression stack. May
- // emit code to affect the physical frame. Does not clobber any registers
- // excepting possibly the stack pointer.
- void Drop(int count);
-
- // Drop one element.
- void Drop() { Drop(1); }
-
- // Pop an element from the top of the expression stack. Discards
- // the result.
- void Pop();
-
- // Pop an element from the top of the expression stack. The register
- // will be one normally used for the top of stack register allocation
- // so you can't hold on to it if you push on the stack.
- Register PopToRegister(Register but_not_to_this_one = no_reg);
-
- // Look at the top of the stack. The register returned is aliased and
- // must be copied to a scratch register before modification.
- Register Peek();
-
- // Look at the value beneath the top of the stack. The register returned is
- // aliased and must be copied to a scratch register before modification.
- Register Peek2();
-
- // Duplicate the top of stack.
- void Dup();
-
- // Duplicate the two elements on top of stack.
- void Dup2();
-
- // Flushes all registers, but it puts a copy of the top-of-stack in r0.
- void SpillAllButCopyTOSToR0();
-
- // Flushes all registers, but it puts a copy of the top-of-stack in r1.
- void SpillAllButCopyTOSToR1();
-
- // Flushes all registers, but it puts a copy of the top-of-stack in r1
- // and the next value on the stack in r0.
- void SpillAllButCopyTOSToR1R0();
-
- // Pop and save an element from the top of the expression stack and
- // emit a corresponding pop instruction.
- void EmitPop(Register reg);
-
- // Takes the top two elements and puts them in r0 (top element) and r1
- // (second element).
- void PopToR1R0();
-
- // Takes the top element and puts it in r1.
- void PopToR1();
-
- // Takes the top element and puts it in r0.
- void PopToR0();
-
- // Push an element on top of the expression stack and emit a
- // corresponding push instruction.
- void EmitPush(Register reg, TypeInfo type_info = TypeInfo::Unknown());
- void EmitPush(Operand operand, TypeInfo type_info = TypeInfo::Unknown());
- void EmitPush(MemOperand operand, TypeInfo type_info = TypeInfo::Unknown());
- void EmitPushRoot(Heap::RootListIndex index);
-
- // Overwrite the nth thing on the stack. If the nth position is in a
- // register then this turns into a mov, otherwise an str. Afterwards
- // you can still use the register even if it is a register that can be
- // used for TOS (r0 or r1).
- void SetElementAt(Register reg, int this_far_down);
-
- // Get a register which is free and which must be immediately used to
- // push on the top of the stack.
- Register GetTOSRegister();
-
- // Push multiple registers on the stack and the virtual frame
- // Register are selected by setting bit in src_regs and
- // are pushed in decreasing order: r15 .. r0.
- void EmitPushMultiple(int count, int src_regs);
-
- static Register scratch0() { return r7; }
- static Register scratch1() { return r9; }
-
- private:
- static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset;
- static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset;
- static const int kContextOffset = StandardFrameConstants::kContextOffset;
-
- static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize;
- static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots.
-
- // 5 states for the top of stack, which can be in memory or in r0 and r1.
- enum TopOfStack {
- NO_TOS_REGISTERS,
- R0_TOS,
- R1_TOS,
- R1_R0_TOS,
- R0_R1_TOS,
- TOS_STATES
- };
-
- static const int kMaxTOSRegisters = 2;
-
- static const bool kR0InUse[TOS_STATES];
- static const bool kR1InUse[TOS_STATES];
- static const int kVirtualElements[TOS_STATES];
- static const TopOfStack kStateAfterPop[TOS_STATES];
- static const TopOfStack kStateAfterPush[TOS_STATES];
- static const Register kTopRegister[TOS_STATES];
- static const Register kBottomRegister[TOS_STATES];
-
- // We allocate up to 5 locals in registers.
- static const int kNumberOfAllocatedRegisters = 5;
- // r2 to r6 are allocated to locals.
- static const int kFirstAllocatedRegister = 2;
-
- static const Register kAllocatedRegisters[kNumberOfAllocatedRegisters];
-
- static Register AllocatedRegister(int r) {
- ASSERT(r >= 0 && r < kNumberOfAllocatedRegisters);
- return kAllocatedRegisters[r];
- }
-
- // The number of elements on the stack frame.
- int element_count_;
- TopOfStack top_of_stack_state_:3;
- int register_allocation_map_:kNumberOfAllocatedRegisters;
- static const int kTOSKnownSmiMapSize = 4;
- unsigned tos_known_smi_map_:kTOSKnownSmiMapSize;
-
- // The index of the element that is at the processor's stack pointer
- // (the sp register). For now since everything is in memory it is given
- // by the number of elements on the not-very-virtual stack frame.
- int stack_pointer() { return element_count_ - 1; }
-
- // The number of frame-allocated locals and parameters respectively.
- inline int parameter_count() const;
- inline int local_count() const;
-
- // The index of the element that is at the processor's frame pointer
- // (the fp register). The parameters, receiver, function, and context
- // are below the frame pointer.
- inline int frame_pointer() const;
-
- // The index of the first parameter. The receiver lies below the first
- // parameter.
- int param0_index() { return 1; }
-
- // The index of the context slot in the frame. It is immediately
- // below the frame pointer.
- inline int context_index();
-
- // The index of the function slot in the frame. It is below the frame
- // pointer and context slot.
- inline int function_index();
-
- // The index of the first local. Between the frame pointer and the
- // locals lies the return address.
- inline int local0_index() const;
-
- // The index of the base of the expression stack.
- inline int expression_base_index() const;
-
- // Convert a frame index into a frame pointer relative offset into the
- // actual stack.
- inline int fp_relative(int index);
-
- // Spill all elements in registers. Spill the top spilled_args elements
- // on the frame. Sync all other frame elements.
- // Then drop dropped_args elements from the virtual frame, to match
- // the effect of an upcoming call that will drop them from the stack.
- void PrepareForCall(int spilled_args, int dropped_args);
-
- // If all top-of-stack registers are in use then the lowest one is pushed
- // onto the physical stack and made free.
- void EnsureOneFreeTOSRegister();
-
- // Emit instructions to get the top of stack state from where we are to where
- // we want to be.
- void MergeTOSTo(TopOfStack expected_state, Condition cond = al);
-
- inline bool Equals(const VirtualFrame* other);
-
- inline void LowerHeight(int count) {
- element_count_ -= count;
- if (count >= kTOSKnownSmiMapSize) {
- tos_known_smi_map_ = 0;
- } else {
- tos_known_smi_map_ >>= count;
- }
- }
-
- inline void RaiseHeight(int count, unsigned known_smi_map = 0) {
- ASSERT(count >= 32 || known_smi_map < (1u << count));
- element_count_ += count;
- if (count >= kTOSKnownSmiMapSize) {
- tos_known_smi_map_ = known_smi_map;
- } else {
- tos_known_smi_map_ = ((tos_known_smi_map_ << count) | known_smi_map);
- }
- }
-
- friend class JumpTarget;
-};
-
-
-} } // namespace v8::internal
-
-#endif // V8_ARM_VIRTUAL_FRAME_ARM_H_
// The original source code covered by the above license above has been
// modified significantly by Google Inc.
-// Copyright 2006-2009 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
#ifndef V8_ASSEMBLER_H_
#define V8_ASSEMBLER_H_
friend class Assembler;
friend class RegexpAssembler;
friend class Displacement;
- friend class ShadowTarget;
friend class RegExpMacroAssemblerIrregexp;
};
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "v8.h"
#include "ast.h"
-#include "jump-target-inl.h"
namespace v8 {
namespace internal {
IterationStatement::IterationStatement(ZoneStringList* labels)
: BreakableStatement(labels, TARGET_FOR_ANONYMOUS),
body_(NULL),
- continue_target_(JumpTarget::BIDIRECTIONAL),
+ continue_target_(),
osr_entry_id_(GetNextId()) {
}
#include "v8.h"
#include "ast.h"
-#include "jump-target-inl.h"
#include "parser.h"
#include "scopes.h"
#include "string-stream.h"
+#include "type-info.h"
namespace v8 {
namespace internal {
}
-void TargetCollector::AddTarget(BreakTarget* target) {
+void TargetCollector::AddTarget(Label* target) {
// Add the label to the collector, but discard duplicates.
int length = targets_->length();
for (int i = 0; i < length; i++) {
}
-bool Expression::GuaranteedSmiResult() {
- BinaryOperation* node = AsBinaryOperation();
- if (node == NULL) return false;
- Token::Value op = node->op();
- switch (op) {
- case Token::COMMA:
- case Token::OR:
- case Token::AND:
- case Token::ADD:
- case Token::SUB:
- case Token::MUL:
- case Token::DIV:
- case Token::MOD:
- case Token::BIT_XOR:
- case Token::SHL:
- return false;
- break;
- case Token::BIT_OR:
- case Token::BIT_AND: {
- Literal* left = node->left()->AsLiteral();
- Literal* right = node->right()->AsLiteral();
- if (left != NULL && left->handle()->IsSmi()) {
- int value = Smi::cast(*left->handle())->value();
- if (op == Token::BIT_OR && ((value & 0xc0000000) == 0xc0000000)) {
- // Result of bitwise or is always a negative Smi.
- return true;
- }
- if (op == Token::BIT_AND && ((value & 0xc0000000) == 0)) {
- // Result of bitwise and is always a positive Smi.
- return true;
- }
- }
- if (right != NULL && right->handle()->IsSmi()) {
- int value = Smi::cast(*right->handle())->value();
- if (op == Token::BIT_OR && ((value & 0xc0000000) == 0xc0000000)) {
- // Result of bitwise or is always a negative Smi.
- return true;
- }
- if (op == Token::BIT_AND && ((value & 0xc0000000) == 0)) {
- // Result of bitwise and is always a positive Smi.
- return true;
- }
- }
- return false;
- break;
- }
- case Token::SAR:
- case Token::SHR: {
- Literal* right = node->right()->AsLiteral();
- if (right != NULL && right->handle()->IsSmi()) {
- int value = Smi::cast(*right->handle())->value();
- if ((value & 0x1F) > 1 ||
- (op == Token::SAR && (value & 0x1F) == 1)) {
- return true;
- }
- }
- return false;
- break;
- }
- default:
- UNREACHABLE();
- break;
- }
- return false;
-}
-
-
-void Expression::CopyAnalysisResultsFrom(Expression* other) {
- bitfields_ = other->bitfields_;
- type_ = other->type_;
-}
-
-
bool UnaryOperation::ResultOverwriteAllowed() {
switch (op_) {
case Token::BIT_NOT:
left_ = assignment->target();
right_ = assignment->value();
pos_ = assignment->position();
- CopyAnalysisResultsFrom(assignment);
}
#include "execution.h"
#include "factory.h"
#include "jsregexp.h"
-#include "jump-target.h"
#include "runtime.h"
#include "token.h"
#include "variables.h"
kTest
};
- Expression() : bitfields_(0) {}
+ Expression() {}
virtual int position() const {
UNREACHABLE();
return Handle<Map>();
}
- // Static type information for this expression.
- StaticType* type() { return &type_; }
-
- // True if the expression is a loop condition.
- bool is_loop_condition() const {
- return LoopConditionField::decode(bitfields_);
- }
- void set_is_loop_condition(bool flag) {
- bitfields_ = (bitfields_ & ~LoopConditionField::mask()) |
- LoopConditionField::encode(flag);
- }
-
- // The value of the expression is guaranteed to be a smi, because the
- // top operation is a bit operation with a mask, or a shift.
- bool GuaranteedSmiResult();
-
- // AST analysis results.
- void CopyAnalysisResultsFrom(Expression* other);
-
- // True if the expression rooted at this node can be compiled by the
- // side-effect free compiler.
- bool side_effect_free() { return SideEffectFreeField::decode(bitfields_); }
- void set_side_effect_free(bool is_side_effect_free) {
- bitfields_ &= ~SideEffectFreeField::mask();
- bitfields_ |= SideEffectFreeField::encode(is_side_effect_free);
- }
-
- // Will the use of this expression treat -0 the same as 0 in all cases?
- // If so, we can return 0 instead of -0 if we want to, to optimize code.
- bool no_negative_zero() { return NoNegativeZeroField::decode(bitfields_); }
- void set_no_negative_zero(bool no_negative_zero) {
- bitfields_ &= ~NoNegativeZeroField::mask();
- bitfields_ |= NoNegativeZeroField::encode(no_negative_zero);
- }
-
- // Will ToInt32 (ECMA 262-3 9.5) or ToUint32 (ECMA 262-3 9.6)
- // be applied to the value of this expression?
- // If so, we may be able to optimize the calculation of the value.
- bool to_int32() { return ToInt32Field::decode(bitfields_); }
- void set_to_int32(bool to_int32) {
- bitfields_ &= ~ToInt32Field::mask();
- bitfields_ |= ToInt32Field::encode(to_int32);
- }
-
- // How many bitwise logical or shift operators are used in this expression?
- int num_bit_ops() { return NumBitOpsField::decode(bitfields_); }
- void set_num_bit_ops(int num_bit_ops) {
- bitfields_ &= ~NumBitOpsField::mask();
- num_bit_ops = Min(num_bit_ops, kMaxNumBitOps);
- bitfields_ |= NumBitOpsField::encode(num_bit_ops);
- }
-
ExternalArrayType external_array_type() const {
- return ExternalArrayTypeField::decode(bitfields_);
+ return external_array_type_;
}
void set_external_array_type(ExternalArrayType array_type) {
- bitfields_ &= ~ExternalArrayTypeField::mask();
- bitfields_ |= ExternalArrayTypeField::encode(array_type);
+ external_array_type_ = array_type;
}
private:
- static const int kMaxNumBitOps = (1 << 5) - 1;
-
- uint32_t bitfields_;
- StaticType type_;
-
- // Using template BitField<type, start, size>.
- class SideEffectFreeField : public BitField<bool, 0, 1> {};
- class NoNegativeZeroField : public BitField<bool, 1, 1> {};
- class ToInt32Field : public BitField<bool, 2, 1> {};
- class NumBitOpsField : public BitField<int, 3, 5> {};
- class LoopConditionField: public BitField<bool, 8, 1> {};
- class ExternalArrayTypeField: public BitField<ExternalArrayType, 9, 4> {};
+ ExternalArrayType external_array_type_;
};
virtual BreakableStatement* AsBreakableStatement() { return this; }
// Code generation
- BreakTarget* break_target() { return &break_target_; }
+ Label* break_target() { return &break_target_; }
// Testers.
bool is_target_for_anonymous() const { return type_ == TARGET_FOR_ANONYMOUS; }
private:
ZoneStringList* labels_;
Type type_;
- BreakTarget break_target_;
+ Label break_target_;
int entry_id_;
int exit_id_;
};
virtual int ContinueId() const = 0;
// Code generation
- BreakTarget* continue_target() { return &continue_target_; }
+ Label* continue_target() { return &continue_target_; }
protected:
explicit inline IterationStatement(ZoneStringList* labels);
private:
Statement* body_;
- BreakTarget continue_target_;
+ Label continue_target_;
int osr_entry_id_;
};
CHECK(!is_default());
return label_;
}
- JumpTarget* body_target() { return &body_target_; }
+ Label* body_target() { return &body_target_; }
ZoneList<Statement*>* statements() const { return statements_; }
int position() const { return position_; }
private:
Expression* label_;
- JumpTarget body_target_;
+ Label body_target_;
ZoneList<Statement*>* statements_;
int position_;
enum CompareTypeFeedback { NONE, SMI_ONLY, OBJECT_ONLY };
// stack in the compiler; this should probably be reworked.
class TargetCollector: public AstNode {
public:
- explicit TargetCollector(ZoneList<BreakTarget*>* targets)
+ explicit TargetCollector(ZoneList<Label*>* targets)
: targets_(targets) {
}
// Adds a jump target to the collector. The collector stores a pointer not
// a copy of the target to make binding work, so make sure not to pass in
// references to something on the stack.
- void AddTarget(BreakTarget* target);
+ void AddTarget(Label* target);
// Virtual behaviour. TargetCollectors are never part of the AST.
virtual void Accept(AstVisitor* v) { UNREACHABLE(); }
virtual TargetCollector* AsTargetCollector() { return this; }
- ZoneList<BreakTarget*>* targets() { return targets_; }
+ ZoneList<Label*>* targets() { return targets_; }
private:
- ZoneList<BreakTarget*>* targets_;
+ ZoneList<Label*>* targets_;
};
explicit TryStatement(Block* try_block)
: try_block_(try_block), escaping_targets_(NULL) { }
- void set_escaping_targets(ZoneList<BreakTarget*>* targets) {
+ void set_escaping_targets(ZoneList<Label*>* targets) {
escaping_targets_ = targets;
}
Block* try_block() const { return try_block_; }
- ZoneList<BreakTarget*>* escaping_targets() const { return escaping_targets_; }
+ ZoneList<Label*>* escaping_targets() const { return escaping_targets_; }
private:
Block* try_block_;
- ZoneList<BreakTarget*>* escaping_targets_;
+ ZoneList<Label*>* escaping_targets_;
};
+++ /dev/null
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-#ifndef V8_CODEGEN_INL_H_
-#define V8_CODEGEN_INL_H_
-
-#include "codegen.h"
-#include "compiler.h"
-#include "register-allocator-inl.h"
-
-#if V8_TARGET_ARCH_IA32
-#include "ia32/codegen-ia32-inl.h"
-#elif V8_TARGET_ARCH_X64
-#include "x64/codegen-x64-inl.h"
-#elif V8_TARGET_ARCH_ARM
-#include "arm/codegen-arm-inl.h"
-#elif V8_TARGET_ARCH_MIPS
-#include "mips/codegen-mips-inl.h"
-#else
-#error Unsupported target architecture.
-#endif
-
-
-namespace v8 {
-namespace internal {
-
-Handle<Script> CodeGenerator::script() { return info_->script(); }
-
-bool CodeGenerator::is_eval() { return info_->is_eval(); }
-
-Scope* CodeGenerator::scope() { return info_->function()->scope(); }
-
-bool CodeGenerator::is_strict_mode() {
- return info_->function()->strict_mode();
-}
-
-StrictModeFlag CodeGenerator::strict_mode_flag() {
- return is_strict_mode() ? kStrictMode : kNonStrictMode;
-}
-
-} } // namespace v8::internal
-
-#endif // V8_CODEGEN_INL_H_
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "v8.h"
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compiler.h"
#include "debug.h"
#include "prettyprinter.h"
-#include "register-allocator-inl.h"
#include "rewriter.h"
#include "runtime.h"
#include "scopeinfo.h"
#include "stub-cache.h"
-#include "virtual-frame-inl.h"
namespace v8 {
namespace internal {
#undef __
-void CodeGenerator::ProcessDeferred() {
- while (!deferred_.is_empty()) {
- DeferredCode* code = deferred_.RemoveLast();
- ASSERT(masm_ == code->masm());
- // Record position of deferred code stub.
- masm_->positions_recorder()->RecordStatementPosition(
- code->statement_position());
- if (code->position() != RelocInfo::kNoPosition) {
- masm_->positions_recorder()->RecordPosition(code->position());
- }
- // Generate the code.
- Comment cmnt(masm_, code->comment());
- masm_->bind(code->entry_label());
- if (code->AutoSaveAndRestore()) {
- code->SaveRegisters();
- }
- code->Generate();
- if (code->AutoSaveAndRestore()) {
- code->RestoreRegisters();
- code->Exit();
- }
- }
-}
-
-
-void DeferredCode::Exit() {
- masm_->jmp(exit_label());
-}
-
-
-void CodeGenerator::SetFrame(VirtualFrame* new_frame,
- RegisterFile* non_frame_registers) {
- RegisterFile saved_counts;
- if (has_valid_frame()) {
- frame_->DetachFromCodeGenerator();
- // The remaining register reference counts are the non-frame ones.
- allocator_->SaveTo(&saved_counts);
- }
-
- if (new_frame != NULL) {
- // Restore the non-frame register references that go with the new frame.
- allocator_->RestoreFrom(non_frame_registers);
- new_frame->AttachToCodeGenerator();
- }
-
- frame_ = new_frame;
- saved_counts.CopyTo(non_frame_registers);
-}
-
-
-void CodeGenerator::DeleteFrame() {
- if (has_valid_frame()) {
- frame_->DetachFromCodeGenerator();
- frame_ = NULL;
- }
-}
-
-
void CodeGenerator::MakeCodePrologue(CompilationInfo* info) {
#ifdef DEBUG
bool print_source = false;
#endif // ENABLE_DISASSEMBLER
}
-
-// Generate the code. Compile the AST and assemble all the pieces into a
-// Code object.
-bool CodeGenerator::MakeCode(CompilationInfo* info) {
- // When using Crankshaft the classic backend should never be used.
- ASSERT(!V8::UseCrankshaft());
- Handle<Script> script = info->script();
- if (!script->IsUndefined() && !script->source()->IsUndefined()) {
- int len = String::cast(script->source())->length();
- Counters* counters = info->isolate()->counters();
- counters->total_old_codegen_source_size()->Increment(len);
- }
- if (FLAG_trace_codegen) {
- PrintF("Classic Compiler - ");
- }
- MakeCodePrologue(info);
- // Generate code.
- const int kInitialBufferSize = 4 * KB;
- MacroAssembler masm(info->isolate(), NULL, kInitialBufferSize);
-#ifdef ENABLE_GDB_JIT_INTERFACE
- masm.positions_recorder()->StartGDBJITLineInfoRecording();
-#endif
- CodeGenerator cgen(&masm);
- CodeGeneratorScope scope(Isolate::Current(), &cgen);
- cgen.Generate(info);
- if (cgen.HasStackOverflow()) {
- ASSERT(!Isolate::Current()->has_pending_exception());
- return false;
- }
-
- InLoopFlag in_loop = info->is_in_loop() ? IN_LOOP : NOT_IN_LOOP;
- Code::Flags flags = Code::ComputeFlags(Code::FUNCTION, in_loop);
- Handle<Code> code = MakeCodeEpilogue(cgen.masm(), flags, info);
- // There is no stack check table in code generated by the classic backend.
- code->SetNoStackCheckTable();
- CodeGenerator::PrintCode(code, info);
- info->SetCode(code); // May be an empty handle.
-#ifdef ENABLE_GDB_JIT_INTERFACE
- if (FLAG_gdbjit && !code.is_null()) {
- GDBJITLineInfo* lineinfo =
- masm.positions_recorder()->DetachGDBJITLineInfo();
-
- GDBJIT(RegisterDetailedLineInfo(*code, lineinfo));
- }
-#endif
- return !code.is_null();
-}
-
-
#ifdef ENABLE_LOGGING_AND_PROFILING
-
static Vector<const char> kRegexp = CStrVector("regexp");
-
bool CodeGenerator::ShouldGenerateLog(Expression* type) {
ASSERT(type != NULL);
if (!LOGGER->is_logging() && !CpuProfiler::is_profiling()) return false;
#endif
-void CodeGenerator::ProcessDeclarations(ZoneList<Declaration*>* declarations) {
- int length = declarations->length();
- int globals = 0;
- for (int i = 0; i < length; i++) {
- Declaration* node = declarations->at(i);
- Variable* var = node->proxy()->var();
- Slot* slot = var->AsSlot();
-
- // If it was not possible to allocate the variable at compile
- // time, we need to "declare" it at runtime to make sure it
- // actually exists in the local context.
- if ((slot != NULL && slot->type() == Slot::LOOKUP) || !var->is_global()) {
- VisitDeclaration(node);
- } else {
- // Count global variables and functions for later processing
- globals++;
- }
- }
-
- // Return in case of no declared global functions or variables.
- if (globals == 0) return;
-
- // Compute array of global variable and function declarations.
- Handle<FixedArray> array = FACTORY->NewFixedArray(2 * globals, TENURED);
- for (int j = 0, i = 0; i < length; i++) {
- Declaration* node = declarations->at(i);
- Variable* var = node->proxy()->var();
- Slot* slot = var->AsSlot();
-
- if ((slot != NULL && slot->type() == Slot::LOOKUP) || !var->is_global()) {
- // Skip - already processed.
- } else {
- array->set(j++, *(var->name()));
- if (node->fun() == NULL) {
- if (var->mode() == Variable::CONST) {
- // In case this is const property use the hole.
- array->set_the_hole(j++);
- } else {
- array->set_undefined(j++);
- }
- } else {
- Handle<SharedFunctionInfo> function =
- Compiler::BuildFunctionInfo(node->fun(), script());
- // Check for stack-overflow exception.
- if (function.is_null()) {
- SetStackOverflow();
- return;
- }
- array->set(j++, *function);
- }
- }
- }
-
- // Invoke the platform-dependent code generator to do the actual
- // declaration the global variables and functions.
- DeclareGlobals(array);
-}
-
-
-// Lookup table for code generators for special runtime calls which are
-// generated inline.
-#define INLINE_FUNCTION_GENERATOR_ADDRESS(Name, argc, ressize) \
- &CodeGenerator::Generate##Name,
-
-const CodeGenerator::InlineFunctionGenerator
- CodeGenerator::kInlineFunctionGenerators[] = {
- INLINE_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS)
- INLINE_RUNTIME_FUNCTION_LIST(INLINE_FUNCTION_GENERATOR_ADDRESS)
-};
-#undef INLINE_FUNCTION_GENERATOR_ADDRESS
-
-
-bool CodeGenerator::CheckForInlineRuntimeCall(CallRuntime* node) {
- ZoneList<Expression*>* args = node->arguments();
- Handle<String> name = node->name();
- const Runtime::Function* function = node->function();
- if (function != NULL && function->intrinsic_type == Runtime::INLINE) {
- int lookup_index = static_cast<int>(function->function_id) -
- static_cast<int>(Runtime::kFirstInlineFunction);
- ASSERT(lookup_index >= 0);
- ASSERT(static_cast<size_t>(lookup_index) <
- ARRAY_SIZE(kInlineFunctionGenerators));
- InlineFunctionGenerator generator = kInlineFunctionGenerators[lookup_index];
- (this->*generator)(args);
- return true;
- }
- return false;
-}
-
-
-// Simple condition analysis. ALWAYS_TRUE and ALWAYS_FALSE represent a
-// known result for the test expression, with no side effects.
-CodeGenerator::ConditionAnalysis CodeGenerator::AnalyzeCondition(
- Expression* cond) {
- if (cond == NULL) return ALWAYS_TRUE;
-
- Literal* lit = cond->AsLiteral();
- if (lit == NULL) return DONT_KNOW;
-
- if (lit->IsTrue()) {
- return ALWAYS_TRUE;
- } else if (lit->IsFalse()) {
- return ALWAYS_FALSE;
- }
-
- return DONT_KNOW;
-}
-
-
bool CodeGenerator::RecordPositions(MacroAssembler* masm,
int pos,
bool right_here) {
}
-void CodeGenerator::CodeForFunctionPosition(FunctionLiteral* fun) {
- if (FLAG_debug_info) RecordPositions(masm(), fun->start_position(), false);
-}
-
-
-void CodeGenerator::CodeForReturnPosition(FunctionLiteral* fun) {
- if (FLAG_debug_info) RecordPositions(masm(), fun->end_position() - 1, false);
-}
-
-
-void CodeGenerator::CodeForStatementPosition(Statement* stmt) {
- if (FLAG_debug_info) RecordPositions(masm(), stmt->statement_pos(), false);
-}
-
-
-void CodeGenerator::CodeForDoWhileConditionPosition(DoWhileStatement* stmt) {
- if (FLAG_debug_info)
- RecordPositions(masm(), stmt->condition_position(), false);
-}
-
-
-void CodeGenerator::CodeForSourcePosition(int pos) {
- if (FLAG_debug_info && pos != RelocInfo::kNoPosition) {
- masm()->positions_recorder()->RecordPosition(pos);
- }
-}
-
-
const char* GenericUnaryOpStub::GetName() {
switch (op_) {
case Token::SUB:
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// shared code:
// CodeGenerator
// ~CodeGenerator
-// ProcessDeferred
// Generate
// ComputeLazyCompile
// BuildFunctionInfo
// CodeForDoWhileConditionPosition
// CodeForSourcePosition
-enum InitState { CONST_INIT, NOT_CONST_INIT };
enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
#if V8_TARGET_ARCH_IA32
#error Unsupported target architecture.
#endif
-#include "register-allocator.h"
-
-namespace v8 {
-namespace internal {
-
-// Code generation can be nested. Code generation scopes form a stack
-// of active code generators.
-class CodeGeneratorScope BASE_EMBEDDED {
- public:
- explicit CodeGeneratorScope(Isolate* isolate, CodeGenerator* cgen)
- : isolate_(isolate) {
- previous_ = isolate->current_code_generator();
- isolate->set_current_code_generator(cgen);
- }
-
- ~CodeGeneratorScope() {
- isolate_->set_current_code_generator(previous_);
- }
-
- static CodeGenerator* Current(Isolate* isolate) {
- ASSERT(isolate->current_code_generator() != NULL);
- return isolate->current_code_generator();
- }
-
- private:
- CodeGenerator* previous_;
- Isolate* isolate_;
-};
-
-#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
-
-// State of used registers in a virtual frame.
-class FrameRegisterState {
- public:
- // Captures the current state of the given frame.
- explicit FrameRegisterState(VirtualFrame* frame);
-
- // Saves the state in the stack.
- void Save(MacroAssembler* masm) const;
-
- // Restores the state from the stack.
- void Restore(MacroAssembler* masm) const;
-
- private:
- // Constants indicating special actions. They should not be multiples
- // of kPointerSize so they will not collide with valid offsets from
- // the frame pointer.
- static const int kIgnore = -1;
- static const int kPush = 1;
-
- // This flag is ored with a valid offset from the frame pointer, so
- // it should fit in the low zero bits of a valid offset.
- static const int kSyncedFlag = 2;
-
- int registers_[RegisterAllocator::kNumRegisters];
-};
-
-#elif V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
-
-
-class FrameRegisterState {
- public:
- inline FrameRegisterState(VirtualFrame frame) : frame_(frame) { }
-
- inline const VirtualFrame* frame() const { return &frame_; }
-
- private:
- VirtualFrame frame_;
-};
-
-#else
-
-#error Unsupported target architecture.
-
-#endif
-
-
-// RuntimeCallHelper implementation that saves/restores state of a
-// virtual frame.
-class VirtualFrameRuntimeCallHelper : public RuntimeCallHelper {
- public:
- // Does not take ownership of |frame_state|.
- explicit VirtualFrameRuntimeCallHelper(const FrameRegisterState* frame_state)
- : frame_state_(frame_state) {}
-
- virtual void BeforeCall(MacroAssembler* masm) const;
-
- virtual void AfterCall(MacroAssembler* masm) const;
-
- private:
- const FrameRegisterState* frame_state_;
-};
-
-
-// Deferred code objects are small pieces of code that are compiled
-// out of line. They are used to defer the compilation of uncommon
-// paths thereby avoiding expensive jumps around uncommon code parts.
-class DeferredCode: public ZoneObject {
- public:
- DeferredCode();
- virtual ~DeferredCode() { }
-
- virtual void Generate() = 0;
-
- MacroAssembler* masm() { return masm_; }
-
- int statement_position() const { return statement_position_; }
- int position() const { return position_; }
-
- Label* entry_label() { return &entry_label_; }
- Label* exit_label() { return &exit_label_; }
-
-#ifdef DEBUG
- void set_comment(const char* comment) { comment_ = comment; }
- const char* comment() const { return comment_; }
-#else
- void set_comment(const char* comment) { }
- const char* comment() const { return ""; }
-#endif
-
- inline void Jump();
- inline void Branch(Condition cc);
- void BindExit() { masm_->bind(&exit_label_); }
-
- const FrameRegisterState* frame_state() const { return &frame_state_; }
-
- void SaveRegisters();
- void RestoreRegisters();
- void Exit();
-
- // If this returns true then all registers will be saved for the duration
- // of the Generate() call. Otherwise the registers are not saved and the
- // Generate() call must bracket runtime any runtime calls with calls to
- // SaveRegisters() and RestoreRegisters(). In this case the Generate
- // method must also call Exit() in order to return to the non-deferred
- // code.
- virtual bool AutoSaveAndRestore() { return true; }
-
- protected:
- MacroAssembler* masm_;
-
- private:
- int statement_position_;
- int position_;
-
- Label entry_label_;
- Label exit_label_;
-
- FrameRegisterState frame_state_;
-
-#ifdef DEBUG
- const char* comment_;
-#endif
- DISALLOW_COPY_AND_ASSIGN(DeferredCode);
-};
-
-
-} } // namespace v8::internal
-
#endif // V8_CODEGEN_H_
#include "compiler.h"
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compilation-cache.h"
#include "data-flow.h"
#include "debug.h"
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "ast.h"
#include "frame-element.h"
-#include "register-allocator.h"
#include "zone.h"
namespace v8 {
#include "v8.h"
#include "code-stubs.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
#include "deoptimizer.h"
#include "disasm.h"
#include "api.h"
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
#include "runtime-profiler.h"
#include "simulator.h"
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "v8.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compiler.h"
#include "debug.h"
#include "full-codegen.h"
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "accessors.h"
#include "api.h"
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compilation-cache.h"
#include "debug.h"
#include "heap-profiler.h"
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_IA32)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "deoptimizer.h"
#include "full-codegen.h"
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-#ifndef V8_IA32_CODEGEN_IA32_INL_H_
-#define V8_IA32_CODEGEN_IA32_INL_H_
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm_)
-
-// Platform-specific inline functions.
-
-void DeferredCode::Jump() { __ jmp(&entry_label_); }
-void DeferredCode::Branch(Condition cc) { __ j(cc, &entry_label_); }
-
-#undef __
-
-} } // namespace v8::internal
-
-#endif // V8_IA32_CODEGEN_IA32_INL_H_
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_IA32)
-#include "codegen-inl.h"
-#include "bootstrapper.h"
-#include "code-stubs.h"
-#include "compiler.h"
-#include "debug.h"
-#include "ic-inl.h"
-#include "parser.h"
-#include "regexp-macro-assembler.h"
-#include "register-allocator-inl.h"
-#include "scopes.h"
-#include "virtual-frame-inl.h"
+#include "codegen.h"
namespace v8 {
namespace internal {
-#define __ ACCESS_MASM(masm)
-
-// -------------------------------------------------------------------------
-// Platform-specific FrameRegisterState functions.
-
-void FrameRegisterState::Save(MacroAssembler* masm) const {
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- int action = registers_[i];
- if (action == kPush) {
- __ push(RegisterAllocator::ToRegister(i));
- } else if (action != kIgnore && (action & kSyncedFlag) == 0) {
- __ mov(Operand(ebp, action), RegisterAllocator::ToRegister(i));
- }
- }
-}
-
-
-void FrameRegisterState::Restore(MacroAssembler* masm) const {
- // Restore registers in reverse order due to the stack.
- for (int i = RegisterAllocator::kNumRegisters - 1; i >= 0; i--) {
- int action = registers_[i];
- if (action == kPush) {
- __ pop(RegisterAllocator::ToRegister(i));
- } else if (action != kIgnore) {
- action &= ~kSyncedFlag;
- __ mov(RegisterAllocator::ToRegister(i), Operand(ebp, action));
- }
- }
-}
-
-
-#undef __
-#define __ ACCESS_MASM(masm_)
-
-// -------------------------------------------------------------------------
-// Platform-specific DeferredCode functions.
-
-void DeferredCode::SaveRegisters() {
- frame_state_.Save(masm_);
-}
-
-
-void DeferredCode::RestoreRegisters() {
- frame_state_.Restore(masm_);
-}
-
// -------------------------------------------------------------------------
// Platform-specific RuntimeCallHelper functions.
-void VirtualFrameRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
- frame_state_->Save(masm);
-}
-
-
-void VirtualFrameRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
- frame_state_->Restore(masm);
-}
-
-
void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
masm->EnterInternalFrame();
}
}
-// -------------------------------------------------------------------------
-// CodeGenState implementation.
-
-CodeGenState::CodeGenState(CodeGenerator* owner)
- : owner_(owner),
- destination_(NULL),
- previous_(NULL) {
- owner_->set_state(this);
-}
-
-
-CodeGenState::CodeGenState(CodeGenerator* owner,
- ControlDestination* destination)
- : owner_(owner),
- destination_(destination),
- previous_(owner->state()) {
- owner_->set_state(this);
-}
-
-
-CodeGenState::~CodeGenState() {
- ASSERT(owner_->state() == this);
- owner_->set_state(previous_);
-}
-
-// -------------------------------------------------------------------------
-// CodeGenerator implementation.
-
-CodeGenerator::CodeGenerator(MacroAssembler* masm)
- : deferred_(8),
- masm_(masm),
- info_(NULL),
- frame_(NULL),
- allocator_(NULL),
- state_(NULL),
- loop_nesting_(0),
- in_safe_int32_mode_(false),
- safe_int32_mode_enabled_(true),
- function_return_is_shadowed_(false),
- in_spilled_code_(false),
- jit_cookie_((FLAG_mask_constants_with_cookie) ?
- V8::RandomPrivate(Isolate::Current()) : 0) {
-}
-
-
-// Calling conventions:
-// ebp: caller's frame pointer
-// esp: stack pointer
-// edi: called JS function
-// esi: callee's context
-
-void CodeGenerator::Generate(CompilationInfo* info) {
- // Record the position for debugging purposes.
- CodeForFunctionPosition(info->function());
- Comment cmnt(masm_, "[ function compiled by virtual frame code generator");
-
- // Initialize state.
- info_ = info;
- ASSERT(allocator_ == NULL);
- RegisterAllocator register_allocator(this);
- allocator_ = ®ister_allocator;
- ASSERT(frame_ == NULL);
- frame_ = new VirtualFrame();
- set_in_spilled_code(false);
-
- // Adjust for function-level loop nesting.
- ASSERT_EQ(0, loop_nesting_);
- loop_nesting_ = info->is_in_loop() ? 1 : 0;
-
- masm()->isolate()->set_jump_target_compiling_deferred_code(false);
-
- {
- CodeGenState state(this);
-
- // Entry:
- // Stack: receiver, arguments, return address.
- // ebp: caller's frame pointer
- // esp: stack pointer
- // edi: called JS function
- // esi: callee's context
- allocator_->Initialize();
-
-#ifdef DEBUG
- if (strlen(FLAG_stop_at) > 0 &&
- info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
- frame_->SpillAll();
- __ int3();
- }
-#endif
-
- frame_->Enter();
-
- // Allocate space for locals and initialize them.
- frame_->AllocateStackSlots();
-
- // Allocate the local context if needed.
- int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
- if (heap_slots > 0) {
- Comment cmnt(masm_, "[ allocate local context");
- // Allocate local context.
- // Get outer context and create a new context based on it.
- frame_->PushFunction();
- Result context;
- if (heap_slots <= FastNewContextStub::kMaximumSlots) {
- FastNewContextStub stub(heap_slots);
- context = frame_->CallStub(&stub, 1);
- } else {
- context = frame_->CallRuntime(Runtime::kNewContext, 1);
- }
-
- // Update context local.
- frame_->SaveContextRegister();
-
- // Verify that the runtime call result and esi agree.
- if (FLAG_debug_code) {
- __ cmp(context.reg(), Operand(esi));
- __ Assert(equal, "Runtime::NewContext should end up in esi");
- }
- }
-
- // TODO(1241774): Improve this code:
- // 1) only needed if we have a context
- // 2) no need to recompute context ptr every single time
- // 3) don't copy parameter operand code from SlotOperand!
- {
- Comment cmnt2(masm_, "[ copy context parameters into .context");
- // Note that iteration order is relevant here! If we have the same
- // parameter twice (e.g., function (x, y, x)), and that parameter
- // needs to be copied into the context, it must be the last argument
- // passed to the parameter that needs to be copied. This is a rare
- // case so we don't check for it, instead we rely on the copying
- // order: such a parameter is copied repeatedly into the same
- // context location and thus the last value is what is seen inside
- // the function.
- for (int i = 0; i < scope()->num_parameters(); i++) {
- Variable* par = scope()->parameter(i);
- Slot* slot = par->AsSlot();
- if (slot != NULL && slot->type() == Slot::CONTEXT) {
- // The use of SlotOperand below is safe in unspilled code
- // because the slot is guaranteed to be a context slot.
- //
- // There are no parameters in the global scope.
- ASSERT(!scope()->is_global_scope());
- frame_->PushParameterAt(i);
- Result value = frame_->Pop();
- value.ToRegister();
-
- // SlotOperand loads context.reg() with the context object
- // stored to, used below in RecordWrite.
- Result context = allocator_->Allocate();
- ASSERT(context.is_valid());
- __ mov(SlotOperand(slot, context.reg()), value.reg());
- int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_valid());
- frame_->Spill(context.reg());
- frame_->Spill(value.reg());
- __ RecordWrite(context.reg(), offset, value.reg(), scratch.reg());
- }
- }
- }
-
- // Store the arguments object. This must happen after context
- // initialization because the arguments object may be stored in
- // the context.
- if (ArgumentsMode() != NO_ARGUMENTS_ALLOCATION) {
- StoreArgumentsObject(true);
- }
-
- // Initialize ThisFunction reference if present.
- if (scope()->is_function_scope() && scope()->function() != NULL) {
- frame_->Push(FACTORY->the_hole_value());
- StoreToSlot(scope()->function()->AsSlot(), NOT_CONST_INIT);
- }
-
-
- // Initialize the function return target after the locals are set
- // up, because it needs the expected frame height from the frame.
- function_return_.set_direction(JumpTarget::BIDIRECTIONAL);
- function_return_is_shadowed_ = false;
-
- // Generate code to 'execute' declarations and initialize functions
- // (source elements). In case of an illegal redeclaration we need to
- // handle that instead of processing the declarations.
- if (scope()->HasIllegalRedeclaration()) {
- Comment cmnt(masm_, "[ illegal redeclarations");
- scope()->VisitIllegalRedeclaration(this);
- } else {
- Comment cmnt(masm_, "[ declarations");
- ProcessDeclarations(scope()->declarations());
- // Bail out if a stack-overflow exception occurred when processing
- // declarations.
- if (HasStackOverflow()) return;
- }
-
- if (FLAG_trace) {
- frame_->CallRuntime(Runtime::kTraceEnter, 0);
- // Ignore the return value.
- }
- CheckStack();
-
- // Compile the body of the function in a vanilla state. Don't
- // bother compiling all the code if the scope has an illegal
- // redeclaration.
- if (!scope()->HasIllegalRedeclaration()) {
- Comment cmnt(masm_, "[ function body");
-#ifdef DEBUG
- bool is_builtin = info->isolate()->bootstrapper()->IsActive();
- bool should_trace =
- is_builtin ? FLAG_trace_builtin_calls : FLAG_trace_calls;
- if (should_trace) {
- frame_->CallRuntime(Runtime::kDebugTrace, 0);
- // Ignore the return value.
- }
-#endif
- VisitStatements(info->function()->body());
-
- // Handle the return from the function.
- if (has_valid_frame()) {
- // If there is a valid frame, control flow can fall off the end of
- // the body. In that case there is an implicit return statement.
- ASSERT(!function_return_is_shadowed_);
- CodeForReturnPosition(info->function());
- frame_->PrepareForReturn();
- Result undefined(FACTORY->undefined_value());
- if (function_return_.is_bound()) {
- function_return_.Jump(&undefined);
- } else {
- function_return_.Bind(&undefined);
- GenerateReturnSequence(&undefined);
- }
- } else if (function_return_.is_linked()) {
- // If the return target has dangling jumps to it, then we have not
- // yet generated the return sequence. This can happen when (a)
- // control does not flow off the end of the body so we did not
- // compile an artificial return statement just above, and (b) there
- // are return statements in the body but (c) they are all shadowed.
- Result return_value;
- function_return_.Bind(&return_value);
- GenerateReturnSequence(&return_value);
- }
- }
- }
-
- // Adjust for function-level loop nesting.
- ASSERT_EQ(loop_nesting_, info->is_in_loop() ? 1 : 0);
- loop_nesting_ = 0;
-
- // Code generation state must be reset.
- ASSERT(state_ == NULL);
- ASSERT(!function_return_is_shadowed_);
- function_return_.Unuse();
- DeleteFrame();
-
- // Process any deferred code using the register allocator.
- if (!HasStackOverflow()) {
- info->isolate()->set_jump_target_compiling_deferred_code(true);
- ProcessDeferred();
- info->isolate()->set_jump_target_compiling_deferred_code(false);
- }
-
- // There is no need to delete the register allocator, it is a
- // stack-allocated local.
- allocator_ = NULL;
-}
-
-
-Operand CodeGenerator::SlotOperand(Slot* slot, Register tmp) {
- // Currently, this assertion will fail if we try to assign to
- // a constant variable that is constant because it is read-only
- // (such as the variable referring to a named function expression).
- // We need to implement assignments to read-only variables.
- // Ideally, we should do this during AST generation (by converting
- // such assignments into expression statements); however, in general
- // we may not be able to make the decision until past AST generation,
- // that is when the entire program is known.
- ASSERT(slot != NULL);
- int index = slot->index();
- switch (slot->type()) {
- case Slot::PARAMETER:
- return frame_->ParameterAt(index);
-
- case Slot::LOCAL:
- return frame_->LocalAt(index);
-
- case Slot::CONTEXT: {
- // Follow the context chain if necessary.
- ASSERT(!tmp.is(esi)); // do not overwrite context register
- Register context = esi;
- int chain_length = scope()->ContextChainLength(slot->var()->scope());
- for (int i = 0; i < chain_length; i++) {
- // Load the closure.
- // (All contexts, even 'with' contexts, have a closure,
- // and it is the same for all contexts inside a function.
- // There is no need to go to the function context first.)
- __ mov(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
- // Load the function context (which is the incoming, outer context).
- __ mov(tmp, FieldOperand(tmp, JSFunction::kContextOffset));
- context = tmp;
- }
- // We may have a 'with' context now. Get the function context.
- // (In fact this mov may never be the needed, since the scope analysis
- // may not permit a direct context access in this case and thus we are
- // always at a function context. However it is safe to dereference be-
- // cause the function context of a function context is itself. Before
- // deleting this mov we should try to create a counter-example first,
- // though...)
- __ mov(tmp, ContextOperand(context, Context::FCONTEXT_INDEX));
- return ContextOperand(tmp, index);
- }
-
- default:
- UNREACHABLE();
- return Operand(eax);
- }
-}
-
-
-Operand CodeGenerator::ContextSlotOperandCheckExtensions(Slot* slot,
- Result tmp,
- JumpTarget* slow) {
- ASSERT(slot->type() == Slot::CONTEXT);
- ASSERT(tmp.is_register());
- Register context = esi;
-
- for (Scope* s = scope(); s != slot->var()->scope(); s = s->outer_scope()) {
- if (s->num_heap_slots() > 0) {
- if (s->calls_eval()) {
- // Check that extension is NULL.
- __ cmp(ContextOperand(context, Context::EXTENSION_INDEX),
- Immediate(0));
- slow->Branch(not_equal, not_taken);
- }
- __ mov(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX));
- __ mov(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
- context = tmp.reg();
- }
- }
- // Check that last extension is NULL.
- __ cmp(ContextOperand(context, Context::EXTENSION_INDEX), Immediate(0));
- slow->Branch(not_equal, not_taken);
- __ mov(tmp.reg(), ContextOperand(context, Context::FCONTEXT_INDEX));
- return ContextOperand(tmp.reg(), slot->index());
-}
-
-
-// Emit code to load the value of an expression to the top of the
-// frame. If the expression is boolean-valued it may be compiled (or
-// partially compiled) into control flow to the control destination.
-// If force_control is true, control flow is forced.
-void CodeGenerator::LoadCondition(Expression* expr,
- ControlDestination* dest,
- bool force_control) {
- ASSERT(!in_spilled_code());
- int original_height = frame_->height();
-
- { CodeGenState new_state(this, dest);
- Visit(expr);
-
- // If we hit a stack overflow, we may not have actually visited
- // the expression. In that case, we ensure that we have a
- // valid-looking frame state because we will continue to generate
- // code as we unwind the C++ stack.
- //
- // It's possible to have both a stack overflow and a valid frame
- // state (eg, a subexpression overflowed, visiting it returned
- // with a dummied frame state, and visiting this expression
- // returned with a normal-looking state).
- if (HasStackOverflow() &&
- !dest->is_used() &&
- frame_->height() == original_height) {
- dest->Goto(true);
- }
- }
-
- if (force_control && !dest->is_used()) {
- // Convert the TOS value into flow to the control destination.
- ToBoolean(dest);
- }
-
- ASSERT(!(force_control && !dest->is_used()));
- ASSERT(dest->is_used() || frame_->height() == original_height + 1);
-}
-
-
-void CodeGenerator::LoadAndSpill(Expression* expression) {
- ASSERT(in_spilled_code());
- set_in_spilled_code(false);
- Load(expression);
- frame_->SpillAll();
- set_in_spilled_code(true);
-}
-
-
-void CodeGenerator::LoadInSafeInt32Mode(Expression* expr,
- BreakTarget* unsafe_bailout) {
- set_unsafe_bailout(unsafe_bailout);
- set_in_safe_int32_mode(true);
- Load(expr);
- Result value = frame_->Pop();
- ASSERT(frame_->HasNoUntaggedInt32Elements());
- if (expr->GuaranteedSmiResult()) {
- ConvertInt32ResultToSmi(&value);
- } else {
- ConvertInt32ResultToNumber(&value);
- }
- set_in_safe_int32_mode(false);
- set_unsafe_bailout(NULL);
- frame_->Push(&value);
-}
-
-
-void CodeGenerator::LoadWithSafeInt32ModeDisabled(Expression* expr) {
- set_safe_int32_mode_enabled(false);
- Load(expr);
- set_safe_int32_mode_enabled(true);
-}
-
-
-void CodeGenerator::ConvertInt32ResultToSmi(Result* value) {
- ASSERT(value->is_untagged_int32());
- if (value->is_register()) {
- __ add(value->reg(), Operand(value->reg()));
- } else {
- ASSERT(value->is_constant());
- ASSERT(value->handle()->IsSmi());
- }
- value->set_untagged_int32(false);
- value->set_type_info(TypeInfo::Smi());
-}
-
-
-void CodeGenerator::ConvertInt32ResultToNumber(Result* value) {
- ASSERT(value->is_untagged_int32());
- if (value->is_register()) {
- Register val = value->reg();
- JumpTarget done;
- __ add(val, Operand(val));
- done.Branch(no_overflow, value);
- __ sar(val, 1);
- // If there was an overflow, bits 30 and 31 of the original number disagree.
- __ xor_(val, 0x80000000u);
- if (CpuFeatures::IsSupported(SSE2)) {
- CpuFeatures::Scope fscope(SSE2);
- __ cvtsi2sd(xmm0, Operand(val));
- } else {
- // Move val to ST[0] in the FPU
- // Push and pop are safe with respect to the virtual frame because
- // all synced elements are below the actual stack pointer.
- __ push(val);
- __ fild_s(Operand(esp, 0));
- __ pop(val);
- }
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_register());
- Label allocation_failed;
- __ AllocateHeapNumber(val, scratch.reg(),
- no_reg, &allocation_failed);
- VirtualFrame* clone = new VirtualFrame(frame_);
- scratch.Unuse();
- if (CpuFeatures::IsSupported(SSE2)) {
- CpuFeatures::Scope fscope(SSE2);
- __ movdbl(FieldOperand(val, HeapNumber::kValueOffset), xmm0);
- } else {
- __ fstp_d(FieldOperand(val, HeapNumber::kValueOffset));
- }
- done.Jump(value);
-
- // Establish the virtual frame, cloned from where AllocateHeapNumber
- // jumped to allocation_failed.
- RegisterFile empty_regs;
- SetFrame(clone, &empty_regs);
- __ bind(&allocation_failed);
- if (!CpuFeatures::IsSupported(SSE2)) {
- // Pop the value from the floating point stack.
- __ fstp(0);
- }
- unsafe_bailout_->Jump();
-
- done.Bind(value);
- } else {
- ASSERT(value->is_constant());
- }
- value->set_untagged_int32(false);
- value->set_type_info(TypeInfo::Integer32());
-}
-
-
-void CodeGenerator::Load(Expression* expr) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- ASSERT(!in_spilled_code());
-
- // If the expression should be a side-effect-free 32-bit int computation,
- // compile that SafeInt32 path, and a bailout path.
- if (!in_safe_int32_mode() &&
- safe_int32_mode_enabled() &&
- expr->side_effect_free() &&
- expr->num_bit_ops() > 2 &&
- CpuFeatures::IsSupported(SSE2)) {
- BreakTarget unsafe_bailout;
- JumpTarget done;
- unsafe_bailout.set_expected_height(frame_->height());
- LoadInSafeInt32Mode(expr, &unsafe_bailout);
- done.Jump();
-
- if (unsafe_bailout.is_linked()) {
- unsafe_bailout.Bind();
- LoadWithSafeInt32ModeDisabled(expr);
- }
- done.Bind();
- } else {
- JumpTarget true_target;
- JumpTarget false_target;
- ControlDestination dest(&true_target, &false_target, true);
- LoadCondition(expr, &dest, false);
-
- if (dest.false_was_fall_through()) {
- // The false target was just bound.
- JumpTarget loaded;
- frame_->Push(FACTORY->false_value());
- // There may be dangling jumps to the true target.
- if (true_target.is_linked()) {
- loaded.Jump();
- true_target.Bind();
- frame_->Push(FACTORY->true_value());
- loaded.Bind();
- }
-
- } else if (dest.is_used()) {
- // There is true, and possibly false, control flow (with true as
- // the fall through).
- JumpTarget loaded;
- frame_->Push(FACTORY->true_value());
- if (false_target.is_linked()) {
- loaded.Jump();
- false_target.Bind();
- frame_->Push(FACTORY->false_value());
- loaded.Bind();
- }
-
- } else {
- // We have a valid value on top of the frame, but we still may
- // have dangling jumps to the true and false targets from nested
- // subexpressions (eg, the left subexpressions of the
- // short-circuited boolean operators).
- ASSERT(has_valid_frame());
- if (true_target.is_linked() || false_target.is_linked()) {
- JumpTarget loaded;
- loaded.Jump(); // Don't lose the current TOS.
- if (true_target.is_linked()) {
- true_target.Bind();
- frame_->Push(FACTORY->true_value());
- if (false_target.is_linked()) {
- loaded.Jump();
- }
- }
- if (false_target.is_linked()) {
- false_target.Bind();
- frame_->Push(FACTORY->false_value());
- }
- loaded.Bind();
- }
- }
- }
- ASSERT(has_valid_frame());
- ASSERT(frame_->height() == original_height + 1);
-}
-
-
-void CodeGenerator::LoadGlobal() {
- if (in_spilled_code()) {
- frame_->EmitPush(GlobalObjectOperand());
- } else {
- Result temp = allocator_->Allocate();
- __ mov(temp.reg(), GlobalObjectOperand());
- frame_->Push(&temp);
- }
-}
-
-
-void CodeGenerator::LoadGlobalReceiver() {
- Result temp = allocator_->Allocate();
- Register reg = temp.reg();
- __ mov(reg, GlobalObjectOperand());
- __ mov(reg, FieldOperand(reg, GlobalObject::kGlobalReceiverOffset));
- frame_->Push(&temp);
-}
-
-
-void CodeGenerator::LoadTypeofExpression(Expression* expr) {
- // Special handling of identifiers as subexpressions of typeof.
- Variable* variable = expr->AsVariableProxy()->AsVariable();
- if (variable != NULL && !variable->is_this() && variable->is_global()) {
- // For a global variable we build the property reference
- // <global>.<variable> and perform a (regular non-contextual) property
- // load to make sure we do not get reference errors.
- Slot global(variable, Slot::CONTEXT, Context::GLOBAL_INDEX);
- Literal key(variable->name());
- Property property(&global, &key, RelocInfo::kNoPosition);
- Reference ref(this, &property);
- ref.GetValue();
- } else if (variable != NULL && variable->AsSlot() != NULL) {
- // For a variable that rewrites to a slot, we signal it is the immediate
- // subexpression of a typeof.
- LoadFromSlotCheckForArguments(variable->AsSlot(), INSIDE_TYPEOF);
- } else {
- // Anything else can be handled normally.
- Load(expr);
- }
-}
-
-
-ArgumentsAllocationMode CodeGenerator::ArgumentsMode() {
- if (scope()->arguments() == NULL) return NO_ARGUMENTS_ALLOCATION;
-
- // In strict mode there is no need for shadow arguments.
- ASSERT(scope()->arguments_shadow() != NULL || scope()->is_strict_mode());
-
- // We don't want to do lazy arguments allocation for functions that
- // have heap-allocated contexts, because it interfers with the
- // uninitialized const tracking in the context objects.
- return (scope()->num_heap_slots() > 0 || scope()->is_strict_mode())
- ? EAGER_ARGUMENTS_ALLOCATION
- : LAZY_ARGUMENTS_ALLOCATION;
-}
-
-
-Result CodeGenerator::StoreArgumentsObject(bool initial) {
- ArgumentsAllocationMode mode = ArgumentsMode();
- ASSERT(mode != NO_ARGUMENTS_ALLOCATION);
-
- Comment cmnt(masm_, "[ store arguments object");
- if (mode == LAZY_ARGUMENTS_ALLOCATION && initial) {
- // When using lazy arguments allocation, we store the arguments marker value
- // as a sentinel indicating that the arguments object hasn't been
- // allocated yet.
- frame_->Push(FACTORY->arguments_marker());
- } else {
- ArgumentsAccessStub stub(is_strict_mode()
- ? ArgumentsAccessStub::NEW_STRICT
- : ArgumentsAccessStub::NEW_NON_STRICT);
- frame_->PushFunction();
- frame_->PushReceiverSlotAddress();
- frame_->Push(Smi::FromInt(scope()->num_parameters()));
- Result result = frame_->CallStub(&stub, 3);
- frame_->Push(&result);
- }
-
- Variable* arguments = scope()->arguments();
- Variable* shadow = scope()->arguments_shadow();
-
- ASSERT(arguments != NULL && arguments->AsSlot() != NULL);
- ASSERT((shadow != NULL && shadow->AsSlot() != NULL) ||
- scope()->is_strict_mode());
-
- JumpTarget done;
- bool skip_arguments = false;
- if (mode == LAZY_ARGUMENTS_ALLOCATION && !initial) {
- // We have to skip storing into the arguments slot if it has
- // already been written to. This can happen if the a function
- // has a local variable named 'arguments'.
- LoadFromSlot(arguments->AsSlot(), NOT_INSIDE_TYPEOF);
- Result probe = frame_->Pop();
- if (probe.is_constant()) {
- // We have to skip updating the arguments object if it has
- // been assigned a proper value.
- skip_arguments = !probe.handle()->IsArgumentsMarker();
- } else {
- __ cmp(Operand(probe.reg()), Immediate(FACTORY->arguments_marker()));
- probe.Unuse();
- done.Branch(not_equal);
- }
- }
- if (!skip_arguments) {
- StoreToSlot(arguments->AsSlot(), NOT_CONST_INIT);
- if (mode == LAZY_ARGUMENTS_ALLOCATION) done.Bind();
- }
- if (shadow != NULL) {
- StoreToSlot(shadow->AsSlot(), NOT_CONST_INIT);
- }
- return frame_->Pop();
-}
-
-//------------------------------------------------------------------------------
-// CodeGenerator implementation of variables, lookups, and stores.
-
-Reference::Reference(CodeGenerator* cgen,
- Expression* expression,
- bool persist_after_get)
- : cgen_(cgen),
- expression_(expression),
- type_(ILLEGAL),
- persist_after_get_(persist_after_get) {
- cgen->LoadReference(this);
-}
-
-
-Reference::~Reference() {
- ASSERT(is_unloaded() || is_illegal());
-}
-
-
-void CodeGenerator::LoadReference(Reference* ref) {
- // References are loaded from both spilled and unspilled code. Set the
- // state to unspilled to allow that (and explicitly spill after
- // construction at the construction sites).
- bool was_in_spilled_code = in_spilled_code_;
- in_spilled_code_ = false;
-
- Comment cmnt(masm_, "[ LoadReference");
- Expression* e = ref->expression();
- Property* property = e->AsProperty();
- Variable* var = e->AsVariableProxy()->AsVariable();
-
- if (property != NULL) {
- // The expression is either a property or a variable proxy that rewrites
- // to a property.
- Load(property->obj());
- if (property->key()->IsPropertyName()) {
- ref->set_type(Reference::NAMED);
- } else {
- Load(property->key());
- ref->set_type(Reference::KEYED);
- }
- } else if (var != NULL) {
- // The expression is a variable proxy that does not rewrite to a
- // property. Global variables are treated as named property references.
- if (var->is_global()) {
- // If eax is free, the register allocator prefers it. Thus the code
- // generator will load the global object into eax, which is where
- // LoadIC wants it. Most uses of Reference call LoadIC directly
- // after the reference is created.
- frame_->Spill(eax);
- LoadGlobal();
- ref->set_type(Reference::NAMED);
- } else {
- ASSERT(var->AsSlot() != NULL);
- ref->set_type(Reference::SLOT);
- }
- } else {
- // Anything else is a runtime error.
- Load(e);
- frame_->CallRuntime(Runtime::kThrowReferenceError, 1);
- }
-
- in_spilled_code_ = was_in_spilled_code;
-}
-
-
-// ECMA-262, section 9.2, page 30: ToBoolean(). Pop the top of stack and
-// convert it to a boolean in the condition code register or jump to
-// 'false_target'/'true_target' as appropriate.
-void CodeGenerator::ToBoolean(ControlDestination* dest) {
- Comment cmnt(masm_, "[ ToBoolean");
-
- // The value to convert should be popped from the frame.
- Result value = frame_->Pop();
- value.ToRegister();
-
- if (value.is_integer32()) { // Also takes Smi case.
- Comment cmnt(masm_, "ONLY_INTEGER_32");
- if (FLAG_debug_code) {
- Label ok;
- __ AbortIfNotNumber(value.reg());
- __ test(value.reg(), Immediate(kSmiTagMask));
- __ j(zero, &ok);
- __ fldz();
- __ fld_d(FieldOperand(value.reg(), HeapNumber::kValueOffset));
- __ FCmp();
- __ j(not_zero, &ok);
- __ Abort("Smi was wrapped in HeapNumber in output from bitop");
- __ bind(&ok);
- }
- // In the integer32 case there are no Smis hidden in heap numbers, so we
- // need only test for Smi zero.
- __ test(value.reg(), Operand(value.reg()));
- dest->false_target()->Branch(zero);
- value.Unuse();
- dest->Split(not_zero);
- } else if (value.is_number()) {
- Comment cmnt(masm_, "ONLY_NUMBER");
- // Fast case if TypeInfo indicates only numbers.
- if (FLAG_debug_code) {
- __ AbortIfNotNumber(value.reg());
- }
- // Smi => false iff zero.
- STATIC_ASSERT(kSmiTag == 0);
- __ test(value.reg(), Operand(value.reg()));
- dest->false_target()->Branch(zero);
- __ test(value.reg(), Immediate(kSmiTagMask));
- dest->true_target()->Branch(zero);
- __ fldz();
- __ fld_d(FieldOperand(value.reg(), HeapNumber::kValueOffset));
- __ FCmp();
- value.Unuse();
- dest->Split(not_zero);
- } else {
- // Fast case checks.
- // 'false' => false.
- __ cmp(value.reg(), FACTORY->false_value());
- dest->false_target()->Branch(equal);
-
- // 'true' => true.
- __ cmp(value.reg(), FACTORY->true_value());
- dest->true_target()->Branch(equal);
-
- // 'undefined' => false.
- __ cmp(value.reg(), FACTORY->undefined_value());
- dest->false_target()->Branch(equal);
-
- // Smi => false iff zero.
- STATIC_ASSERT(kSmiTag == 0);
- __ test(value.reg(), Operand(value.reg()));
- dest->false_target()->Branch(zero);
- __ test(value.reg(), Immediate(kSmiTagMask));
- dest->true_target()->Branch(zero);
-
- // Call the stub for all other cases.
- frame_->Push(&value); // Undo the Pop() from above.
- ToBooleanStub stub;
- Result temp = frame_->CallStub(&stub, 1);
- // Convert the result to a condition code.
- __ test(temp.reg(), Operand(temp.reg()));
- temp.Unuse();
- dest->Split(not_equal);
- }
-}
-
-
-// Perform or call the specialized stub for a binary operation. Requires the
-// three registers left, right and dst to be distinct and spilled. This
-// deferred operation has up to three entry points: The main one calls the
-// runtime system. The second is for when the result is a non-Smi. The
-// third is for when at least one of the inputs is non-Smi and we have SSE2.
-class DeferredInlineBinaryOperation: public DeferredCode {
- public:
- DeferredInlineBinaryOperation(Token::Value op,
- Register dst,
- Register left,
- Register right,
- TypeInfo left_info,
- TypeInfo right_info,
- OverwriteMode mode)
- : op_(op), dst_(dst), left_(left), right_(right),
- left_info_(left_info), right_info_(right_info), mode_(mode) {
- set_comment("[ DeferredInlineBinaryOperation");
- ASSERT(!left.is(right));
- }
-
- virtual void Generate();
-
- // This stub makes explicit calls to SaveRegisters(), RestoreRegisters() and
- // Exit().
- virtual bool AutoSaveAndRestore() { return false; }
-
- void JumpToAnswerOutOfRange(Condition cond);
- void JumpToConstantRhs(Condition cond, Smi* smi_value);
- Label* NonSmiInputLabel();
-
- private:
- void GenerateAnswerOutOfRange();
- void GenerateNonSmiInput();
-
- Token::Value op_;
- Register dst_;
- Register left_;
- Register right_;
- TypeInfo left_info_;
- TypeInfo right_info_;
- OverwriteMode mode_;
- Label answer_out_of_range_;
- Label non_smi_input_;
- Label constant_rhs_;
- Smi* smi_value_;
-};
-
-
-Label* DeferredInlineBinaryOperation::NonSmiInputLabel() {
- if (Token::IsBitOp(op_) &&
- CpuFeatures::IsSupported(SSE2)) {
- return &non_smi_input_;
- } else {
- return entry_label();
- }
-}
-
-
-void DeferredInlineBinaryOperation::JumpToAnswerOutOfRange(Condition cond) {
- __ j(cond, &answer_out_of_range_);
-}
-
-
-void DeferredInlineBinaryOperation::JumpToConstantRhs(Condition cond,
- Smi* smi_value) {
- smi_value_ = smi_value;
- __ j(cond, &constant_rhs_);
-}
-
-
-void DeferredInlineBinaryOperation::Generate() {
- // Registers are not saved implicitly for this stub, so we should not
- // tread on the registers that were not passed to us.
- if (CpuFeatures::IsSupported(SSE2) &&
- ((op_ == Token::ADD) ||
- (op_ == Token::SUB) ||
- (op_ == Token::MUL) ||
- (op_ == Token::DIV))) {
- CpuFeatures::Scope use_sse2(SSE2);
- Label call_runtime, after_alloc_failure;
- Label left_smi, right_smi, load_right, do_op;
- if (!left_info_.IsSmi()) {
- __ test(left_, Immediate(kSmiTagMask));
- __ j(zero, &left_smi);
- if (!left_info_.IsNumber()) {
- __ cmp(FieldOperand(left_, HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- __ j(not_equal, &call_runtime);
- }
- __ movdbl(xmm0, FieldOperand(left_, HeapNumber::kValueOffset));
- if (mode_ == OVERWRITE_LEFT) {
- __ mov(dst_, left_);
- }
- __ jmp(&load_right);
-
- __ bind(&left_smi);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left_);
- }
- __ SmiUntag(left_);
- __ cvtsi2sd(xmm0, Operand(left_));
- __ SmiTag(left_);
- if (mode_ == OVERWRITE_LEFT) {
- Label alloc_failure;
- __ push(left_);
- __ AllocateHeapNumber(dst_, left_, no_reg, &after_alloc_failure);
- __ pop(left_);
- }
-
- __ bind(&load_right);
- if (!right_info_.IsSmi()) {
- __ test(right_, Immediate(kSmiTagMask));
- __ j(zero, &right_smi);
- if (!right_info_.IsNumber()) {
- __ cmp(FieldOperand(right_, HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- __ j(not_equal, &call_runtime);
- }
- __ movdbl(xmm1, FieldOperand(right_, HeapNumber::kValueOffset));
- if (mode_ == OVERWRITE_RIGHT) {
- __ mov(dst_, right_);
- } else if (mode_ == NO_OVERWRITE) {
- Label alloc_failure;
- __ push(left_);
- __ AllocateHeapNumber(dst_, left_, no_reg, &after_alloc_failure);
- __ pop(left_);
- }
- __ jmp(&do_op);
-
- __ bind(&right_smi);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(right_);
- }
- __ SmiUntag(right_);
- __ cvtsi2sd(xmm1, Operand(right_));
- __ SmiTag(right_);
- if (mode_ == OVERWRITE_RIGHT || mode_ == NO_OVERWRITE) {
- __ push(left_);
- __ AllocateHeapNumber(dst_, left_, no_reg, &after_alloc_failure);
- __ pop(left_);
- }
-
- __ bind(&do_op);
- switch (op_) {
- case Token::ADD: __ addsd(xmm0, xmm1); break;
- case Token::SUB: __ subsd(xmm0, xmm1); break;
- case Token::MUL: __ mulsd(xmm0, xmm1); break;
- case Token::DIV: __ divsd(xmm0, xmm1); break;
- default: UNREACHABLE();
- }
- __ movdbl(FieldOperand(dst_, HeapNumber::kValueOffset), xmm0);
- Exit();
-
-
- __ bind(&after_alloc_failure);
- __ pop(left_);
- __ bind(&call_runtime);
- }
- // Register spilling is not done implicitly for this stub.
- // We can't postpone it any more now though.
- SaveRegisters();
-
- GenericBinaryOpStub stub(op_,
- mode_,
- NO_SMI_CODE_IN_STUB,
- TypeInfo::Combine(left_info_, right_info_));
- stub.GenerateCall(masm_, left_, right_);
- if (!dst_.is(eax)) __ mov(dst_, eax);
- RestoreRegisters();
- Exit();
-
- if (non_smi_input_.is_linked() || constant_rhs_.is_linked()) {
- GenerateNonSmiInput();
- }
- if (answer_out_of_range_.is_linked()) {
- GenerateAnswerOutOfRange();
- }
-}
-
-
-void DeferredInlineBinaryOperation::GenerateNonSmiInput() {
- // We know at least one of the inputs was not a Smi.
- // This is a third entry point into the deferred code.
- // We may not overwrite left_ because we want to be able
- // to call the handling code for non-smi answer and it
- // might want to overwrite the heap number in left_.
- ASSERT(!right_.is(dst_));
- ASSERT(!left_.is(dst_));
- ASSERT(!left_.is(right_));
- // This entry point is used for bit ops where the right hand side
- // is a constant Smi and the left hand side is a heap object. It
- // is also used for bit ops where both sides are unknown, but where
- // at least one of them is a heap object.
- bool rhs_is_constant = constant_rhs_.is_linked();
- // We can't generate code for both cases.
- ASSERT(!non_smi_input_.is_linked() || !constant_rhs_.is_linked());
-
- if (FLAG_debug_code) {
- __ int3(); // We don't fall through into this code.
- }
-
- __ bind(&non_smi_input_);
-
- if (rhs_is_constant) {
- __ bind(&constant_rhs_);
- // In this case the input is a heap object and it is in the dst_ register.
- // The left_ and right_ registers have not been initialized yet.
- __ mov(right_, Immediate(smi_value_));
- __ mov(left_, Operand(dst_));
- if (!CpuFeatures::IsSupported(SSE2)) {
- __ jmp(entry_label());
- return;
- } else {
- CpuFeatures::Scope use_sse2(SSE2);
- __ JumpIfNotNumber(dst_, left_info_, entry_label());
- __ ConvertToInt32(dst_, left_, dst_, left_info_, entry_label());
- __ SmiUntag(right_);
- }
- } else {
- // We know we have SSE2 here because otherwise the label is not linked (see
- // NonSmiInputLabel).
- CpuFeatures::Scope use_sse2(SSE2);
- // Handle the non-constant right hand side situation:
- if (left_info_.IsSmi()) {
- // Right is a heap object.
- __ JumpIfNotNumber(right_, right_info_, entry_label());
- __ ConvertToInt32(right_, right_, dst_, right_info_, entry_label());
- __ mov(dst_, Operand(left_));
- __ SmiUntag(dst_);
- } else if (right_info_.IsSmi()) {
- // Left is a heap object.
- __ JumpIfNotNumber(left_, left_info_, entry_label());
- __ ConvertToInt32(dst_, left_, dst_, left_info_, entry_label());
- __ SmiUntag(right_);
- } else {
- // Here we don't know if it's one or both that is a heap object.
- Label only_right_is_heap_object, got_both;
- __ mov(dst_, Operand(left_));
- __ SmiUntag(dst_, &only_right_is_heap_object);
- // Left was a heap object.
- __ JumpIfNotNumber(left_, left_info_, entry_label());
- __ ConvertToInt32(dst_, left_, dst_, left_info_, entry_label());
- __ SmiUntag(right_, &got_both);
- // Both were heap objects.
- __ rcl(right_, 1); // Put tag back.
- __ JumpIfNotNumber(right_, right_info_, entry_label());
- __ ConvertToInt32(right_, right_, no_reg, right_info_, entry_label());
- __ jmp(&got_both);
- __ bind(&only_right_is_heap_object);
- __ JumpIfNotNumber(right_, right_info_, entry_label());
- __ ConvertToInt32(right_, right_, no_reg, right_info_, entry_label());
- __ bind(&got_both);
- }
- }
- ASSERT(op_ == Token::BIT_AND ||
- op_ == Token::BIT_OR ||
- op_ == Token::BIT_XOR ||
- right_.is(ecx));
- switch (op_) {
- case Token::BIT_AND: __ and_(dst_, Operand(right_)); break;
- case Token::BIT_OR: __ or_(dst_, Operand(right_)); break;
- case Token::BIT_XOR: __ xor_(dst_, Operand(right_)); break;
- case Token::SHR: __ shr_cl(dst_); break;
- case Token::SAR: __ sar_cl(dst_); break;
- case Token::SHL: __ shl_cl(dst_); break;
- default: UNREACHABLE();
- }
- if (op_ == Token::SHR) {
- // Check that the *unsigned* result fits in a smi. Neither of
- // the two high-order bits can be set:
- // * 0x80000000: high bit would be lost when smi tagging.
- // * 0x40000000: this number would convert to negative when smi
- // tagging.
- __ test(dst_, Immediate(0xc0000000));
- __ j(not_zero, &answer_out_of_range_);
- } else {
- // Check that the *signed* result fits in a smi.
- __ cmp(dst_, 0xc0000000);
- __ j(negative, &answer_out_of_range_);
- }
- __ SmiTag(dst_);
- Exit();
-}
-
-
-void DeferredInlineBinaryOperation::GenerateAnswerOutOfRange() {
- Label after_alloc_failure2;
- Label allocation_ok;
- __ bind(&after_alloc_failure2);
- // We have to allocate a number, causing a GC, while keeping hold of
- // the answer in dst_. The answer is not a Smi. We can't just call the
- // runtime shift function here because we already threw away the inputs.
- __ xor_(left_, Operand(left_));
- __ shl(dst_, 1); // Put top bit in carry flag and Smi tag the low bits.
- __ rcr(left_, 1); // Rotate with carry.
- __ push(dst_); // Smi tagged low 31 bits.
- __ push(left_); // 0 or 0x80000000, which is Smi tagged in both cases.
- __ CallRuntime(Runtime::kNumberAlloc, 0);
- if (!left_.is(eax)) {
- __ mov(left_, eax);
- }
- __ pop(right_); // High bit.
- __ pop(dst_); // Low 31 bits.
- __ shr(dst_, 1); // Put 0 in top bit.
- __ or_(dst_, Operand(right_));
- __ jmp(&allocation_ok);
-
- // This is the second entry point to the deferred code. It is used only by
- // the bit operations.
- // The dst_ register has the answer. It is not Smi tagged. If mode_ is
- // OVERWRITE_LEFT then left_ must contain either an overwritable heap number
- // or a Smi.
- // Put a heap number pointer in left_.
- __ bind(&answer_out_of_range_);
- SaveRegisters();
- if (mode_ == OVERWRITE_LEFT) {
- __ test(left_, Immediate(kSmiTagMask));
- __ j(not_zero, &allocation_ok);
- }
- // This trashes right_.
- __ AllocateHeapNumber(left_, right_, no_reg, &after_alloc_failure2);
- __ bind(&allocation_ok);
- if (CpuFeatures::IsSupported(SSE2) &&
- op_ != Token::SHR) {
- CpuFeatures::Scope use_sse2(SSE2);
- ASSERT(Token::IsBitOp(op_));
- // Signed conversion.
- __ cvtsi2sd(xmm0, Operand(dst_));
- __ movdbl(FieldOperand(left_, HeapNumber::kValueOffset), xmm0);
- } else {
- if (op_ == Token::SHR) {
- __ push(Immediate(0)); // High word of unsigned value.
- __ push(dst_);
- __ fild_d(Operand(esp, 0));
- __ Drop(2);
- } else {
- ASSERT(Token::IsBitOp(op_));
- __ push(dst_);
- __ fild_s(Operand(esp, 0)); // Signed conversion.
- __ pop(dst_);
- }
- __ fstp_d(FieldOperand(left_, HeapNumber::kValueOffset));
- }
- __ mov(dst_, left_);
- RestoreRegisters();
- Exit();
-}
-
-
-static TypeInfo CalculateTypeInfo(TypeInfo operands_type,
- Token::Value op,
- const Result& right,
- const Result& left) {
- // Set TypeInfo of result according to the operation performed.
- // Rely on the fact that smis have a 31 bit payload on ia32.
- STATIC_ASSERT(kSmiValueSize == 31);
- switch (op) {
- case Token::COMMA:
- return right.type_info();
- case Token::OR:
- case Token::AND:
- // Result type can be either of the two input types.
- return operands_type;
- case Token::BIT_AND: {
- // Anding with positive Smis will give you a Smi.
- if (right.is_constant() && right.handle()->IsSmi() &&
- Smi::cast(*right.handle())->value() >= 0) {
- return TypeInfo::Smi();
- } else if (left.is_constant() && left.handle()->IsSmi() &&
- Smi::cast(*left.handle())->value() >= 0) {
- return TypeInfo::Smi();
- }
- return (operands_type.IsSmi())
- ? TypeInfo::Smi()
- : TypeInfo::Integer32();
- }
- case Token::BIT_OR: {
- // Oring with negative Smis will give you a Smi.
- if (right.is_constant() && right.handle()->IsSmi() &&
- Smi::cast(*right.handle())->value() < 0) {
- return TypeInfo::Smi();
- } else if (left.is_constant() && left.handle()->IsSmi() &&
- Smi::cast(*left.handle())->value() < 0) {
- return TypeInfo::Smi();
- }
- return (operands_type.IsSmi())
- ? TypeInfo::Smi()
- : TypeInfo::Integer32();
- }
- case Token::BIT_XOR:
- // Result is always a 32 bit integer. Smi property of inputs is preserved.
- return (operands_type.IsSmi())
- ? TypeInfo::Smi()
- : TypeInfo::Integer32();
- case Token::SAR:
- if (left.is_smi()) return TypeInfo::Smi();
- // Result is a smi if we shift by a constant >= 1, otherwise an integer32.
- // Shift amount is masked with 0x1F (ECMA standard 11.7.2).
- return (right.is_constant() && right.handle()->IsSmi()
- && (Smi::cast(*right.handle())->value() & 0x1F) >= 1)
- ? TypeInfo::Smi()
- : TypeInfo::Integer32();
- case Token::SHR:
- // Result is a smi if we shift by a constant >= 2, an integer32 if
- // we shift by 1, and an unsigned 32-bit integer if we shift by 0.
- if (right.is_constant() && right.handle()->IsSmi()) {
- int shift_amount = Smi::cast(*right.handle())->value() & 0x1F;
- if (shift_amount > 1) {
- return TypeInfo::Smi();
- } else if (shift_amount > 0) {
- return TypeInfo::Integer32();
- }
- }
- return TypeInfo::Number();
- case Token::ADD:
- if (operands_type.IsSmi()) {
- // The Integer32 range is big enough to take the sum of any two Smis.
- return TypeInfo::Integer32();
- } else if (operands_type.IsNumber()) {
- return TypeInfo::Number();
- } else if (left.type_info().IsString() || right.type_info().IsString()) {
- return TypeInfo::String();
- } else {
- return TypeInfo::Unknown();
- }
- case Token::SHL:
- return TypeInfo::Integer32();
- case Token::SUB:
- // The Integer32 range is big enough to take the difference of any two
- // Smis.
- return (operands_type.IsSmi()) ?
- TypeInfo::Integer32() :
- TypeInfo::Number();
- case Token::MUL:
- case Token::DIV:
- case Token::MOD:
- // Result is always a number.
- return TypeInfo::Number();
- default:
- UNREACHABLE();
- }
- UNREACHABLE();
- return TypeInfo::Unknown();
-}
-
-
-void CodeGenerator::GenericBinaryOperation(BinaryOperation* expr,
- OverwriteMode overwrite_mode) {
- Comment cmnt(masm_, "[ BinaryOperation");
- Token::Value op = expr->op();
- Comment cmnt_token(masm_, Token::String(op));
-
- if (op == Token::COMMA) {
- // Simply discard left value.
- frame_->Nip(1);
- return;
- }
-
- Result right = frame_->Pop();
- Result left = frame_->Pop();
-
- if (op == Token::ADD) {
- const bool left_is_string = left.type_info().IsString();
- const bool right_is_string = right.type_info().IsString();
- // Make sure constant strings have string type info.
- ASSERT(!(left.is_constant() && left.handle()->IsString()) ||
- left_is_string);
- ASSERT(!(right.is_constant() && right.handle()->IsString()) ||
- right_is_string);
- if (left_is_string || right_is_string) {
- frame_->Push(&left);
- frame_->Push(&right);
- Result answer;
- if (left_is_string) {
- if (right_is_string) {
- StringAddStub stub(NO_STRING_CHECK_IN_STUB);
- answer = frame_->CallStub(&stub, 2);
- } else {
- StringAddStub stub(NO_STRING_CHECK_LEFT_IN_STUB);
- answer = frame_->CallStub(&stub, 2);
- }
- } else if (right_is_string) {
- StringAddStub stub(NO_STRING_CHECK_RIGHT_IN_STUB);
- answer = frame_->CallStub(&stub, 2);
- }
- answer.set_type_info(TypeInfo::String());
- frame_->Push(&answer);
- return;
- }
- // Neither operand is known to be a string.
- }
-
- bool left_is_smi_constant = left.is_constant() && left.handle()->IsSmi();
- bool left_is_non_smi_constant = left.is_constant() && !left.handle()->IsSmi();
- bool right_is_smi_constant = right.is_constant() && right.handle()->IsSmi();
- bool right_is_non_smi_constant =
- right.is_constant() && !right.handle()->IsSmi();
-
- if (left_is_smi_constant && right_is_smi_constant) {
- // Compute the constant result at compile time, and leave it on the frame.
- int left_int = Smi::cast(*left.handle())->value();
- int right_int = Smi::cast(*right.handle())->value();
- if (FoldConstantSmis(op, left_int, right_int)) return;
- }
-
- // Get number type of left and right sub-expressions.
- TypeInfo operands_type =
- TypeInfo::Combine(left.type_info(), right.type_info());
-
- TypeInfo result_type = CalculateTypeInfo(operands_type, op, right, left);
-
- Result answer;
- if (left_is_non_smi_constant || right_is_non_smi_constant) {
- // Go straight to the slow case, with no smi code.
- GenericBinaryOpStub stub(op,
- overwrite_mode,
- NO_SMI_CODE_IN_STUB,
- operands_type);
- answer = GenerateGenericBinaryOpStubCall(&stub, &left, &right);
- } else if (right_is_smi_constant) {
- answer = ConstantSmiBinaryOperation(expr, &left, right.handle(),
- false, overwrite_mode);
- } else if (left_is_smi_constant) {
- answer = ConstantSmiBinaryOperation(expr, &right, left.handle(),
- true, overwrite_mode);
- } else {
- // Set the flags based on the operation, type and loop nesting level.
- // Bit operations always assume they likely operate on Smis. Still only
- // generate the inline Smi check code if this operation is part of a loop.
- // For all other operations only inline the Smi check code for likely smis
- // if the operation is part of a loop.
- if (loop_nesting() > 0 &&
- (Token::IsBitOp(op) ||
- operands_type.IsInteger32() ||
- expr->type()->IsLikelySmi())) {
- answer = LikelySmiBinaryOperation(expr, &left, &right, overwrite_mode);
- } else {
- GenericBinaryOpStub stub(op,
- overwrite_mode,
- NO_GENERIC_BINARY_FLAGS,
- operands_type);
- answer = GenerateGenericBinaryOpStubCall(&stub, &left, &right);
- }
- }
-
- answer.set_type_info(result_type);
- frame_->Push(&answer);
-}
-
-
-Result CodeGenerator::GenerateGenericBinaryOpStubCall(GenericBinaryOpStub* stub,
- Result* left,
- Result* right) {
- if (stub->ArgsInRegistersSupported()) {
- stub->SetArgsInRegisters();
- return frame_->CallStub(stub, left, right);
- } else {
- frame_->Push(left);
- frame_->Push(right);
- return frame_->CallStub(stub, 2);
- }
-}
-
-
-bool CodeGenerator::FoldConstantSmis(Token::Value op, int left, int right) {
- Object* answer_object = HEAP->undefined_value();
- switch (op) {
- case Token::ADD:
- if (Smi::IsValid(left + right)) {
- answer_object = Smi::FromInt(left + right);
- }
- break;
- case Token::SUB:
- if (Smi::IsValid(left - right)) {
- answer_object = Smi::FromInt(left - right);
- }
- break;
- case Token::MUL: {
- double answer = static_cast<double>(left) * right;
- if (answer >= Smi::kMinValue && answer <= Smi::kMaxValue) {
- // If the product is zero and the non-zero factor is negative,
- // the spec requires us to return floating point negative zero.
- if (answer != 0 || (left >= 0 && right >= 0)) {
- answer_object = Smi::FromInt(static_cast<int>(answer));
- }
- }
- }
- break;
- case Token::DIV:
- case Token::MOD:
- break;
- case Token::BIT_OR:
- answer_object = Smi::FromInt(left | right);
- break;
- case Token::BIT_AND:
- answer_object = Smi::FromInt(left & right);
- break;
- case Token::BIT_XOR:
- answer_object = Smi::FromInt(left ^ right);
- break;
-
- case Token::SHL: {
- int shift_amount = right & 0x1F;
- if (Smi::IsValid(left << shift_amount)) {
- answer_object = Smi::FromInt(left << shift_amount);
- }
- break;
- }
- case Token::SHR: {
- int shift_amount = right & 0x1F;
- unsigned int unsigned_left = left;
- unsigned_left >>= shift_amount;
- if (unsigned_left <= static_cast<unsigned int>(Smi::kMaxValue)) {
- answer_object = Smi::FromInt(unsigned_left);
- }
- break;
- }
- case Token::SAR: {
- int shift_amount = right & 0x1F;
- unsigned int unsigned_left = left;
- if (left < 0) {
- // Perform arithmetic shift of a negative number by
- // complementing number, logical shifting, complementing again.
- unsigned_left = ~unsigned_left;
- unsigned_left >>= shift_amount;
- unsigned_left = ~unsigned_left;
- } else {
- unsigned_left >>= shift_amount;
- }
- ASSERT(Smi::IsValid(static_cast<int32_t>(unsigned_left)));
- answer_object = Smi::FromInt(static_cast<int32_t>(unsigned_left));
- break;
- }
- default:
- UNREACHABLE();
- break;
- }
- if (answer_object->IsUndefined()) {
- return false;
- }
- frame_->Push(Handle<Object>(answer_object));
- return true;
-}
-
-
-void CodeGenerator::JumpIfBothSmiUsingTypeInfo(Result* left,
- Result* right,
- JumpTarget* both_smi) {
- TypeInfo left_info = left->type_info();
- TypeInfo right_info = right->type_info();
- if (left_info.IsDouble() || left_info.IsString() ||
- right_info.IsDouble() || right_info.IsString()) {
- // We know that left and right are not both smi. Don't do any tests.
- return;
- }
-
- if (left->reg().is(right->reg())) {
- if (!left_info.IsSmi()) {
- __ test(left->reg(), Immediate(kSmiTagMask));
- both_smi->Branch(zero);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left->reg());
- left->Unuse();
- right->Unuse();
- both_smi->Jump();
- }
- } else if (!left_info.IsSmi()) {
- if (!right_info.IsSmi()) {
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), left->reg());
- __ or_(temp.reg(), Operand(right->reg()));
- __ test(temp.reg(), Immediate(kSmiTagMask));
- temp.Unuse();
- both_smi->Branch(zero);
- } else {
- __ test(left->reg(), Immediate(kSmiTagMask));
- both_smi->Branch(zero);
- }
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left->reg());
- if (!right_info.IsSmi()) {
- __ test(right->reg(), Immediate(kSmiTagMask));
- both_smi->Branch(zero);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(right->reg());
- left->Unuse();
- right->Unuse();
- both_smi->Jump();
- }
- }
-}
-
-
-void CodeGenerator::JumpIfNotBothSmiUsingTypeInfo(Register left,
- Register right,
- Register scratch,
- TypeInfo left_info,
- TypeInfo right_info,
- DeferredCode* deferred) {
- JumpIfNotBothSmiUsingTypeInfo(left,
- right,
- scratch,
- left_info,
- right_info,
- deferred->entry_label());
-}
-
-
-void CodeGenerator::JumpIfNotBothSmiUsingTypeInfo(Register left,
- Register right,
- Register scratch,
- TypeInfo left_info,
- TypeInfo right_info,
- Label* on_not_smi) {
- if (left.is(right)) {
- if (!left_info.IsSmi()) {
- __ test(left, Immediate(kSmiTagMask));
- __ j(not_zero, on_not_smi);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left);
- }
- } else if (!left_info.IsSmi()) {
- if (!right_info.IsSmi()) {
- __ mov(scratch, left);
- __ or_(scratch, Operand(right));
- __ test(scratch, Immediate(kSmiTagMask));
- __ j(not_zero, on_not_smi);
- } else {
- __ test(left, Immediate(kSmiTagMask));
- __ j(not_zero, on_not_smi);
- if (FLAG_debug_code) __ AbortIfNotSmi(right);
- }
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left);
- if (!right_info.IsSmi()) {
- __ test(right, Immediate(kSmiTagMask));
- __ j(not_zero, on_not_smi);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(right);
- }
- }
-}
-
-
-// Implements a binary operation using a deferred code object and some
-// inline code to operate on smis quickly.
-Result CodeGenerator::LikelySmiBinaryOperation(BinaryOperation* expr,
- Result* left,
- Result* right,
- OverwriteMode overwrite_mode) {
- // Copy the type info because left and right may be overwritten.
- TypeInfo left_type_info = left->type_info();
- TypeInfo right_type_info = right->type_info();
- Token::Value op = expr->op();
- Result answer;
- // Special handling of div and mod because they use fixed registers.
- if (op == Token::DIV || op == Token::MOD) {
- // We need eax as the quotient register, edx as the remainder
- // register, neither left nor right in eax or edx, and left copied
- // to eax.
- Result quotient;
- Result remainder;
- bool left_is_in_eax = false;
- // Step 1: get eax for quotient.
- if ((left->is_register() && left->reg().is(eax)) ||
- (right->is_register() && right->reg().is(eax))) {
- // One or both is in eax. Use a fresh non-edx register for
- // them.
- Result fresh = allocator_->Allocate();
- ASSERT(fresh.is_valid());
- if (fresh.reg().is(edx)) {
- remainder = fresh;
- fresh = allocator_->Allocate();
- ASSERT(fresh.is_valid());
- }
- if (left->is_register() && left->reg().is(eax)) {
- quotient = *left;
- *left = fresh;
- left_is_in_eax = true;
- }
- if (right->is_register() && right->reg().is(eax)) {
- quotient = *right;
- *right = fresh;
- }
- __ mov(fresh.reg(), eax);
- } else {
- // Neither left nor right is in eax.
- quotient = allocator_->Allocate(eax);
- }
- ASSERT(quotient.is_register() && quotient.reg().is(eax));
- ASSERT(!(left->is_register() && left->reg().is(eax)));
- ASSERT(!(right->is_register() && right->reg().is(eax)));
-
- // Step 2: get edx for remainder if necessary.
- if (!remainder.is_valid()) {
- if ((left->is_register() && left->reg().is(edx)) ||
- (right->is_register() && right->reg().is(edx))) {
- Result fresh = allocator_->Allocate();
- ASSERT(fresh.is_valid());
- if (left->is_register() && left->reg().is(edx)) {
- remainder = *left;
- *left = fresh;
- }
- if (right->is_register() && right->reg().is(edx)) {
- remainder = *right;
- *right = fresh;
- }
- __ mov(fresh.reg(), edx);
- } else {
- // Neither left nor right is in edx.
- remainder = allocator_->Allocate(edx);
- }
- }
- ASSERT(remainder.is_register() && remainder.reg().is(edx));
- ASSERT(!(left->is_register() && left->reg().is(edx)));
- ASSERT(!(right->is_register() && right->reg().is(edx)));
-
- left->ToRegister();
- right->ToRegister();
- frame_->Spill(eax);
- frame_->Spill(edx);
- // DeferredInlineBinaryOperation requires all the registers that it is
- // told about to be spilled and distinct.
- Result distinct_right = frame_->MakeDistinctAndSpilled(left, right);
-
- // Check that left and right are smi tagged.
- DeferredInlineBinaryOperation* deferred =
- new DeferredInlineBinaryOperation(op,
- (op == Token::DIV) ? eax : edx,
- left->reg(),
- distinct_right.reg(),
- left_type_info,
- right_type_info,
- overwrite_mode);
- JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(), edx,
- left_type_info, right_type_info, deferred);
- if (!left_is_in_eax) {
- __ mov(eax, left->reg());
- }
- // Sign extend eax into edx:eax.
- __ cdq();
- // Check for 0 divisor.
- __ test(right->reg(), Operand(right->reg()));
- deferred->Branch(zero);
- // Divide edx:eax by the right operand.
- __ idiv(right->reg());
-
- // Complete the operation.
- if (op == Token::DIV) {
- // Check for negative zero result. If result is zero, and divisor
- // is negative, return a floating point negative zero. The
- // virtual frame is unchanged in this block, so local control flow
- // can use a Label rather than a JumpTarget. If the context of this
- // expression will treat -0 like 0, do not do this test.
- if (!expr->no_negative_zero()) {
- Label non_zero_result;
- __ test(left->reg(), Operand(left->reg()));
- __ j(not_zero, &non_zero_result);
- __ test(right->reg(), Operand(right->reg()));
- deferred->Branch(negative);
- __ bind(&non_zero_result);
- }
- // Check for the corner case of dividing the most negative smi by
- // -1. We cannot use the overflow flag, since it is not set by
- // idiv instruction.
- STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
- __ cmp(eax, 0x40000000);
- deferred->Branch(equal);
- // Check that the remainder is zero.
- __ test(edx, Operand(edx));
- deferred->Branch(not_zero);
- // Tag the result and store it in the quotient register.
- __ SmiTag(eax);
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- answer = quotient;
- } else {
- ASSERT(op == Token::MOD);
- // Check for a negative zero result. If the result is zero, and
- // the dividend is negative, return a floating point negative
- // zero. The frame is unchanged in this block, so local control
- // flow can use a Label rather than a JumpTarget.
- if (!expr->no_negative_zero()) {
- Label non_zero_result;
- __ test(edx, Operand(edx));
- __ j(not_zero, &non_zero_result, taken);
- __ test(left->reg(), Operand(left->reg()));
- deferred->Branch(negative);
- __ bind(&non_zero_result);
- }
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- answer = remainder;
- }
- ASSERT(answer.is_valid());
- return answer;
- }
-
- // Special handling of shift operations because they use fixed
- // registers.
- if (op == Token::SHL || op == Token::SHR || op == Token::SAR) {
- // Move left out of ecx if necessary.
- if (left->is_register() && left->reg().is(ecx)) {
- *left = allocator_->Allocate();
- ASSERT(left->is_valid());
- __ mov(left->reg(), ecx);
- }
- right->ToRegister(ecx);
- left->ToRegister();
- ASSERT(left->is_register() && !left->reg().is(ecx));
- ASSERT(right->is_register() && right->reg().is(ecx));
- if (left_type_info.IsSmi()) {
- if (FLAG_debug_code) __ AbortIfNotSmi(left->reg());
- }
- if (right_type_info.IsSmi()) {
- if (FLAG_debug_code) __ AbortIfNotSmi(right->reg());
- }
-
- // We will modify right, it must be spilled.
- frame_->Spill(ecx);
- // DeferredInlineBinaryOperation requires all the registers that it is told
- // about to be spilled and distinct. We know that right is ecx and left is
- // not ecx.
- frame_->Spill(left->reg());
-
- // Use a fresh answer register to avoid spilling the left operand.
- answer = allocator_->Allocate();
- ASSERT(answer.is_valid());
-
- DeferredInlineBinaryOperation* deferred =
- new DeferredInlineBinaryOperation(op,
- answer.reg(),
- left->reg(),
- ecx,
- left_type_info,
- right_type_info,
- overwrite_mode);
- JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(), answer.reg(),
- left_type_info, right_type_info,
- deferred->NonSmiInputLabel());
-
- // Untag both operands.
- __ mov(answer.reg(), left->reg());
- __ SmiUntag(answer.reg());
- __ SmiUntag(right->reg()); // Right is ecx.
-
- // Perform the operation.
- ASSERT(right->reg().is(ecx));
- switch (op) {
- case Token::SAR: {
- __ sar_cl(answer.reg());
- if (!left_type_info.IsSmi()) {
- // Check that the *signed* result fits in a smi.
- __ cmp(answer.reg(), 0xc0000000);
- deferred->JumpToAnswerOutOfRange(negative);
- }
- break;
- }
- case Token::SHR: {
- __ shr_cl(answer.reg());
- // Check that the *unsigned* result fits in a smi. Neither of
- // the two high-order bits can be set:
- // * 0x80000000: high bit would be lost when smi tagging.
- // * 0x40000000: this number would convert to negative when smi
- // tagging.
- // These two cases can only happen with shifts by 0 or 1 when
- // handed a valid smi. If the answer cannot be represented by a
- // smi, restore the left and right arguments, and jump to slow
- // case. The low bit of the left argument may be lost, but only
- // in a case where it is dropped anyway.
- __ test(answer.reg(), Immediate(0xc0000000));
- deferred->JumpToAnswerOutOfRange(not_zero);
- break;
- }
- case Token::SHL: {
- __ shl_cl(answer.reg());
- // Check that the *signed* result fits in a smi.
- __ cmp(answer.reg(), 0xc0000000);
- deferred->JumpToAnswerOutOfRange(negative);
- break;
- }
- default:
- UNREACHABLE();
- }
- // Smi-tag the result in answer.
- __ SmiTag(answer.reg());
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- ASSERT(answer.is_valid());
- return answer;
- }
-
- // Handle the other binary operations.
- left->ToRegister();
- right->ToRegister();
- // DeferredInlineBinaryOperation requires all the registers that it is told
- // about to be spilled.
- Result distinct_right = frame_->MakeDistinctAndSpilled(left, right);
- // A newly allocated register answer is used to hold the answer. The
- // registers containing left and right are not modified so they don't
- // need to be spilled in the fast case.
- answer = allocator_->Allocate();
- ASSERT(answer.is_valid());
-
- // Perform the smi tag check.
- DeferredInlineBinaryOperation* deferred =
- new DeferredInlineBinaryOperation(op,
- answer.reg(),
- left->reg(),
- distinct_right.reg(),
- left_type_info,
- right_type_info,
- overwrite_mode);
- Label non_smi_bit_op;
- if (op != Token::BIT_OR) {
- JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(), answer.reg(),
- left_type_info, right_type_info,
- deferred->NonSmiInputLabel());
- }
-
- __ mov(answer.reg(), left->reg());
- switch (op) {
- case Token::ADD:
- __ add(answer.reg(), Operand(right->reg()));
- deferred->Branch(overflow);
- break;
-
- case Token::SUB:
- __ sub(answer.reg(), Operand(right->reg()));
- deferred->Branch(overflow);
- break;
-
- case Token::MUL: {
- // If the smi tag is 0 we can just leave the tag on one operand.
- STATIC_ASSERT(kSmiTag == 0); // Adjust code below if not the case.
- // Remove smi tag from the left operand (but keep sign).
- // Left-hand operand has been copied into answer.
- __ SmiUntag(answer.reg());
- // Do multiplication of smis, leaving result in answer.
- __ imul(answer.reg(), Operand(right->reg()));
- // Go slow on overflows.
- deferred->Branch(overflow);
- // Check for negative zero result. If product is zero, and one
- // argument is negative, go to slow case. The frame is unchanged
- // in this block, so local control flow can use a Label rather
- // than a JumpTarget.
- if (!expr->no_negative_zero()) {
- Label non_zero_result;
- __ test(answer.reg(), Operand(answer.reg()));
- __ j(not_zero, &non_zero_result, taken);
- __ mov(answer.reg(), left->reg());
- __ or_(answer.reg(), Operand(right->reg()));
- deferred->Branch(negative);
- __ xor_(answer.reg(), Operand(answer.reg())); // Positive 0 is correct.
- __ bind(&non_zero_result);
- }
- break;
- }
-
- case Token::BIT_OR:
- __ or_(answer.reg(), Operand(right->reg()));
- __ test(answer.reg(), Immediate(kSmiTagMask));
- __ j(not_zero, deferred->NonSmiInputLabel());
- break;
-
- case Token::BIT_AND:
- __ and_(answer.reg(), Operand(right->reg()));
- break;
-
- case Token::BIT_XOR:
- __ xor_(answer.reg(), Operand(right->reg()));
- break;
-
- default:
- UNREACHABLE();
- break;
- }
-
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- ASSERT(answer.is_valid());
- return answer;
-}
-
-
-// Call the appropriate binary operation stub to compute src op value
-// and leave the result in dst.
-class DeferredInlineSmiOperation: public DeferredCode {
- public:
- DeferredInlineSmiOperation(Token::Value op,
- Register dst,
- Register src,
- TypeInfo type_info,
- Smi* value,
- OverwriteMode overwrite_mode)
- : op_(op),
- dst_(dst),
- src_(src),
- type_info_(type_info),
- value_(value),
- overwrite_mode_(overwrite_mode) {
- if (type_info.IsSmi()) overwrite_mode_ = NO_OVERWRITE;
- set_comment("[ DeferredInlineSmiOperation");
- }
-
- virtual void Generate();
-
- private:
- Token::Value op_;
- Register dst_;
- Register src_;
- TypeInfo type_info_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiOperation::Generate() {
- // For mod we don't generate all the Smi code inline.
- GenericBinaryOpStub stub(
- op_,
- overwrite_mode_,
- (op_ == Token::MOD) ? NO_GENERIC_BINARY_FLAGS : NO_SMI_CODE_IN_STUB,
- TypeInfo::Combine(TypeInfo::Smi(), type_info_));
- stub.GenerateCall(masm_, src_, value_);
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-// Call the appropriate binary operation stub to compute value op src
-// and leave the result in dst.
-class DeferredInlineSmiOperationReversed: public DeferredCode {
- public:
- DeferredInlineSmiOperationReversed(Token::Value op,
- Register dst,
- Smi* value,
- Register src,
- TypeInfo type_info,
- OverwriteMode overwrite_mode)
- : op_(op),
- dst_(dst),
- type_info_(type_info),
- value_(value),
- src_(src),
- overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiOperationReversed");
- }
-
- virtual void Generate();
-
- private:
- Token::Value op_;
- Register dst_;
- TypeInfo type_info_;
- Smi* value_;
- Register src_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiOperationReversed::Generate() {
- GenericBinaryOpStub stub(
- op_,
- overwrite_mode_,
- NO_SMI_CODE_IN_STUB,
- TypeInfo::Combine(TypeInfo::Smi(), type_info_));
- stub.GenerateCall(masm_, value_, src_);
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-// The result of src + value is in dst. It either overflowed or was not
-// smi tagged. Undo the speculative addition and call the appropriate
-// specialized stub for add. The result is left in dst.
-class DeferredInlineSmiAdd: public DeferredCode {
- public:
- DeferredInlineSmiAdd(Register dst,
- TypeInfo type_info,
- Smi* value,
- OverwriteMode overwrite_mode)
- : dst_(dst),
- type_info_(type_info),
- value_(value),
- overwrite_mode_(overwrite_mode) {
- if (type_info_.IsSmi()) overwrite_mode_ = NO_OVERWRITE;
- set_comment("[ DeferredInlineSmiAdd");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- TypeInfo type_info_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiAdd::Generate() {
- // Undo the optimistic add operation and call the shared stub.
- __ sub(Operand(dst_), Immediate(value_));
- GenericBinaryOpStub igostub(
- Token::ADD,
- overwrite_mode_,
- NO_SMI_CODE_IN_STUB,
- TypeInfo::Combine(TypeInfo::Smi(), type_info_));
- igostub.GenerateCall(masm_, dst_, value_);
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-// The result of value + src is in dst. It either overflowed or was not
-// smi tagged. Undo the speculative addition and call the appropriate
-// specialized stub for add. The result is left in dst.
-class DeferredInlineSmiAddReversed: public DeferredCode {
- public:
- DeferredInlineSmiAddReversed(Register dst,
- TypeInfo type_info,
- Smi* value,
- OverwriteMode overwrite_mode)
- : dst_(dst),
- type_info_(type_info),
- value_(value),
- overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiAddReversed");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- TypeInfo type_info_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiAddReversed::Generate() {
- // Undo the optimistic add operation and call the shared stub.
- __ sub(Operand(dst_), Immediate(value_));
- GenericBinaryOpStub igostub(
- Token::ADD,
- overwrite_mode_,
- NO_SMI_CODE_IN_STUB,
- TypeInfo::Combine(TypeInfo::Smi(), type_info_));
- igostub.GenerateCall(masm_, value_, dst_);
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-// The result of src - value is in dst. It either overflowed or was not
-// smi tagged. Undo the speculative subtraction and call the
-// appropriate specialized stub for subtract. The result is left in
-// dst.
-class DeferredInlineSmiSub: public DeferredCode {
- public:
- DeferredInlineSmiSub(Register dst,
- TypeInfo type_info,
- Smi* value,
- OverwriteMode overwrite_mode)
- : dst_(dst),
- type_info_(type_info),
- value_(value),
- overwrite_mode_(overwrite_mode) {
- if (type_info.IsSmi()) overwrite_mode_ = NO_OVERWRITE;
- set_comment("[ DeferredInlineSmiSub");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- TypeInfo type_info_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiSub::Generate() {
- // Undo the optimistic sub operation and call the shared stub.
- __ add(Operand(dst_), Immediate(value_));
- GenericBinaryOpStub igostub(
- Token::SUB,
- overwrite_mode_,
- NO_SMI_CODE_IN_STUB,
- TypeInfo::Combine(TypeInfo::Smi(), type_info_));
- igostub.GenerateCall(masm_, dst_, value_);
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-Result CodeGenerator::ConstantSmiBinaryOperation(BinaryOperation* expr,
- Result* operand,
- Handle<Object> value,
- bool reversed,
- OverwriteMode overwrite_mode) {
- // Generate inline code for a binary operation when one of the
- // operands is a constant smi. Consumes the argument "operand".
- if (IsUnsafeSmi(value)) {
- Result unsafe_operand(value);
- if (reversed) {
- return LikelySmiBinaryOperation(expr, &unsafe_operand, operand,
- overwrite_mode);
- } else {
- return LikelySmiBinaryOperation(expr, operand, &unsafe_operand,
- overwrite_mode);
- }
- }
-
- // Get the literal value.
- Smi* smi_value = Smi::cast(*value);
- int int_value = smi_value->value();
-
- Token::Value op = expr->op();
- Result answer;
- switch (op) {
- case Token::ADD: {
- operand->ToRegister();
- frame_->Spill(operand->reg());
-
- // Optimistically add. Call the specialized add stub if the
- // result is not a smi or overflows.
- DeferredCode* deferred = NULL;
- if (reversed) {
- deferred = new DeferredInlineSmiAddReversed(operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- } else {
- deferred = new DeferredInlineSmiAdd(operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- }
- __ add(Operand(operand->reg()), Immediate(value));
- deferred->Branch(overflow);
- if (!operand->type_info().IsSmi()) {
- __ test(operand->reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(operand->reg());
- }
- deferred->BindExit();
- answer = *operand;
- break;
- }
-
- case Token::SUB: {
- DeferredCode* deferred = NULL;
- if (reversed) {
- // The reversed case is only hit when the right operand is not a
- // constant.
- ASSERT(operand->is_register());
- answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- __ Set(answer.reg(), Immediate(value));
- deferred =
- new DeferredInlineSmiOperationReversed(op,
- answer.reg(),
- smi_value,
- operand->reg(),
- operand->type_info(),
- overwrite_mode);
- __ sub(answer.reg(), Operand(operand->reg()));
- } else {
- operand->ToRegister();
- frame_->Spill(operand->reg());
- answer = *operand;
- deferred = new DeferredInlineSmiSub(operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- __ sub(Operand(operand->reg()), Immediate(value));
- }
- deferred->Branch(overflow);
- if (!operand->type_info().IsSmi()) {
- __ test(answer.reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(operand->reg());
- }
- deferred->BindExit();
- operand->Unuse();
- break;
- }
-
- case Token::SAR:
- if (reversed) {
- Result constant_operand(value);
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- // Only the least significant 5 bits of the shift value are used.
- // In the slow case, this masking is done inside the runtime call.
- int shift_value = int_value & 0x1f;
- operand->ToRegister();
- frame_->Spill(operand->reg());
- if (!operand->type_info().IsSmi()) {
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- __ test(operand->reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- if (shift_value > 0) {
- __ sar(operand->reg(), shift_value);
- __ and_(operand->reg(), ~kSmiTagMask);
- }
- deferred->BindExit();
- } else {
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(operand->reg());
- }
- if (shift_value > 0) {
- __ sar(operand->reg(), shift_value);
- __ and_(operand->reg(), ~kSmiTagMask);
- }
- }
- answer = *operand;
- }
- break;
-
- case Token::SHR:
- if (reversed) {
- Result constant_operand(value);
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- // Only the least significant 5 bits of the shift value are used.
- // In the slow case, this masking is done inside the runtime call.
- int shift_value = int_value & 0x1f;
- operand->ToRegister();
- answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- answer.reg(),
- operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- if (!operand->type_info().IsSmi()) {
- __ test(operand->reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(operand->reg());
- }
- __ mov(answer.reg(), operand->reg());
- __ SmiUntag(answer.reg());
- __ shr(answer.reg(), shift_value);
- // A negative Smi shifted right two is in the positive Smi range.
- if (shift_value < 2) {
- __ test(answer.reg(), Immediate(0xc0000000));
- deferred->Branch(not_zero);
- }
- operand->Unuse();
- __ SmiTag(answer.reg());
- deferred->BindExit();
- }
- break;
-
- case Token::SHL:
- if (reversed) {
- // Move operand into ecx and also into a second register.
- // If operand is already in a register, take advantage of that.
- // This lets us modify ecx, but still bail out to deferred code.
- Result right;
- Result right_copy_in_ecx;
- TypeInfo right_type_info = operand->type_info();
- operand->ToRegister();
- if (operand->reg().is(ecx)) {
- right = allocator()->Allocate();
- __ mov(right.reg(), ecx);
- frame_->Spill(ecx);
- right_copy_in_ecx = *operand;
- } else {
- right_copy_in_ecx = allocator()->Allocate(ecx);
- __ mov(ecx, operand->reg());
- right = *operand;
- }
- operand->Unuse();
-
- answer = allocator()->Allocate();
- DeferredInlineSmiOperationReversed* deferred =
- new DeferredInlineSmiOperationReversed(op,
- answer.reg(),
- smi_value,
- right.reg(),
- right_type_info,
- overwrite_mode);
- __ mov(answer.reg(), Immediate(int_value));
- __ sar(ecx, kSmiTagSize);
- if (!right_type_info.IsSmi()) {
- deferred->Branch(carry);
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(right.reg());
- }
- __ shl_cl(answer.reg());
- __ cmp(answer.reg(), 0xc0000000);
- deferred->Branch(sign);
- __ SmiTag(answer.reg());
-
- deferred->BindExit();
- } else {
- // Only the least significant 5 bits of the shift value are used.
- // In the slow case, this masking is done inside the runtime call.
- int shift_value = int_value & 0x1f;
- operand->ToRegister();
- if (shift_value == 0) {
- // Spill operand so it can be overwritten in the slow case.
- frame_->Spill(operand->reg());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- __ test(operand->reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- deferred->BindExit();
- answer = *operand;
- } else {
- // Use a fresh temporary for nonzero shift values.
- answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- answer.reg(),
- operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- if (!operand->type_info().IsSmi()) {
- __ test(operand->reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(operand->reg());
- }
- __ mov(answer.reg(), operand->reg());
- STATIC_ASSERT(kSmiTag == 0); // adjust code if not the case
- // We do no shifts, only the Smi conversion, if shift_value is 1.
- if (shift_value > 1) {
- __ shl(answer.reg(), shift_value - 1);
- }
- // Convert int result to Smi, checking that it is in int range.
- STATIC_ASSERT(kSmiTagSize == 1); // adjust code if not the case
- __ add(answer.reg(), Operand(answer.reg()));
- deferred->Branch(overflow);
- deferred->BindExit();
- operand->Unuse();
- }
- }
- break;
-
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND: {
- operand->ToRegister();
- // DeferredInlineBinaryOperation requires all the registers that it is
- // told about to be spilled.
- frame_->Spill(operand->reg());
- DeferredInlineBinaryOperation* deferred = NULL;
- if (!operand->type_info().IsSmi()) {
- Result left = allocator()->Allocate();
- ASSERT(left.is_valid());
- Result right = allocator()->Allocate();
- ASSERT(right.is_valid());
- deferred = new DeferredInlineBinaryOperation(
- op,
- operand->reg(),
- left.reg(),
- right.reg(),
- operand->type_info(),
- TypeInfo::Smi(),
- overwrite_mode == NO_OVERWRITE ? NO_OVERWRITE : OVERWRITE_LEFT);
- __ test(operand->reg(), Immediate(kSmiTagMask));
- deferred->JumpToConstantRhs(not_zero, smi_value);
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(operand->reg());
- }
- if (op == Token::BIT_AND) {
- __ and_(Operand(operand->reg()), Immediate(value));
- } else if (op == Token::BIT_XOR) {
- if (int_value != 0) {
- __ xor_(Operand(operand->reg()), Immediate(value));
- }
- } else {
- ASSERT(op == Token::BIT_OR);
- if (int_value != 0) {
- __ or_(Operand(operand->reg()), Immediate(value));
- }
- }
- if (deferred != NULL) deferred->BindExit();
- answer = *operand;
- break;
- }
-
- case Token::DIV:
- if (!reversed && int_value == 2) {
- operand->ToRegister();
- frame_->Spill(operand->reg());
-
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- // Check that lowest log2(value) bits of operand are zero, and test
- // smi tag at the same time.
- STATIC_ASSERT(kSmiTag == 0);
- STATIC_ASSERT(kSmiTagSize == 1);
- __ test(operand->reg(), Immediate(3));
- deferred->Branch(not_zero); // Branch if non-smi or odd smi.
- __ sar(operand->reg(), 1);
- deferred->BindExit();
- answer = *operand;
- } else {
- // Cannot fall through MOD to default case, so we duplicate the
- // default case here.
- Result constant_operand(value);
- if (reversed) {
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- answer = LikelySmiBinaryOperation(expr, operand, &constant_operand,
- overwrite_mode);
- }
- }
- break;
-
- // Generate inline code for mod of powers of 2 and negative powers of 2.
- case Token::MOD:
- if (!reversed &&
- int_value != 0 &&
- (IsPowerOf2(int_value) || IsPowerOf2(-int_value))) {
- operand->ToRegister();
- frame_->Spill(operand->reg());
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- operand->type_info(),
- smi_value,
- overwrite_mode);
- // Check for negative or non-Smi left hand side.
- __ test(operand->reg(), Immediate(kSmiTagMask | kSmiSignMask));
- deferred->Branch(not_zero);
- if (int_value < 0) int_value = -int_value;
- if (int_value == 1) {
- __ mov(operand->reg(), Immediate(Smi::FromInt(0)));
- } else {
- __ and_(operand->reg(), (int_value << kSmiTagSize) - 1);
- }
- deferred->BindExit();
- answer = *operand;
- break;
- }
- // Fall through if we did not find a power of 2 on the right hand side!
- // The next case must be the default.
-
- default: {
- Result constant_operand(value);
- if (reversed) {
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- answer = LikelySmiBinaryOperation(expr, operand, &constant_operand,
- overwrite_mode);
- }
- break;
- }
- }
- ASSERT(answer.is_valid());
- return answer;
-}
-
-
-static bool CouldBeNaN(const Result& result) {
- if (result.type_info().IsSmi()) return false;
- if (result.type_info().IsInteger32()) return false;
- if (!result.is_constant()) return true;
- if (!result.handle()->IsHeapNumber()) return false;
- return isnan(HeapNumber::cast(*result.handle())->value());
-}
-
-
-// Convert from signed to unsigned comparison to match the way EFLAGS are set
-// by FPU and XMM compare instructions.
-static Condition DoubleCondition(Condition cc) {
- switch (cc) {
- case less: return below;
- case equal: return equal;
- case less_equal: return below_equal;
- case greater: return above;
- case greater_equal: return above_equal;
- default: UNREACHABLE();
- }
- UNREACHABLE();
- return equal;
-}
-
-
-static CompareFlags ComputeCompareFlags(NaNInformation nan_info,
- bool inline_number_compare) {
- CompareFlags flags = NO_SMI_COMPARE_IN_STUB;
- if (nan_info == kCantBothBeNaN) {
- flags = static_cast<CompareFlags>(flags | CANT_BOTH_BE_NAN);
- }
- if (inline_number_compare) {
- flags = static_cast<CompareFlags>(flags | NO_NUMBER_COMPARE_IN_STUB);
- }
- return flags;
-}
-
-
-void CodeGenerator::Comparison(AstNode* node,
- Condition cc,
- bool strict,
- ControlDestination* dest) {
- // Strict only makes sense for equality comparisons.
- ASSERT(!strict || cc == equal);
-
- Result left_side;
- Result right_side;
- // Implement '>' and '<=' by reversal to obtain ECMA-262 conversion order.
- if (cc == greater || cc == less_equal) {
- cc = ReverseCondition(cc);
- left_side = frame_->Pop();
- right_side = frame_->Pop();
- } else {
- right_side = frame_->Pop();
- left_side = frame_->Pop();
- }
- ASSERT(cc == less || cc == equal || cc == greater_equal);
-
- // If either side is a constant smi, optimize the comparison.
- bool left_side_constant_smi = false;
- bool left_side_constant_null = false;
- bool left_side_constant_1_char_string = false;
- if (left_side.is_constant()) {
- left_side_constant_smi = left_side.handle()->IsSmi();
- left_side_constant_null = left_side.handle()->IsNull();
- left_side_constant_1_char_string =
- (left_side.handle()->IsString() &&
- String::cast(*left_side.handle())->length() == 1 &&
- String::cast(*left_side.handle())->IsAsciiRepresentation());
- }
- bool right_side_constant_smi = false;
- bool right_side_constant_null = false;
- bool right_side_constant_1_char_string = false;
- if (right_side.is_constant()) {
- right_side_constant_smi = right_side.handle()->IsSmi();
- right_side_constant_null = right_side.handle()->IsNull();
- right_side_constant_1_char_string =
- (right_side.handle()->IsString() &&
- String::cast(*right_side.handle())->length() == 1 &&
- String::cast(*right_side.handle())->IsAsciiRepresentation());
- }
-
- if (left_side_constant_smi || right_side_constant_smi) {
- bool is_loop_condition = (node->AsExpression() != NULL) &&
- node->AsExpression()->is_loop_condition();
- ConstantSmiComparison(cc, strict, dest, &left_side, &right_side,
- left_side_constant_smi, right_side_constant_smi,
- is_loop_condition);
- } else if (left_side_constant_1_char_string ||
- right_side_constant_1_char_string) {
- if (left_side_constant_1_char_string && right_side_constant_1_char_string) {
- // Trivial case, comparing two constants.
- int left_value = String::cast(*left_side.handle())->Get(0);
- int right_value = String::cast(*right_side.handle())->Get(0);
- switch (cc) {
- case less:
- dest->Goto(left_value < right_value);
- break;
- case equal:
- dest->Goto(left_value == right_value);
- break;
- case greater_equal:
- dest->Goto(left_value >= right_value);
- break;
- default:
- UNREACHABLE();
- }
- } else {
- // Only one side is a constant 1 character string.
- // If left side is a constant 1-character string, reverse the operands.
- // Since one side is a constant string, conversion order does not matter.
- if (left_side_constant_1_char_string) {
- Result temp = left_side;
- left_side = right_side;
- right_side = temp;
- cc = ReverseCondition(cc);
- // This may reintroduce greater or less_equal as the value of cc.
- // CompareStub and the inline code both support all values of cc.
- }
- // Implement comparison against a constant string, inlining the case
- // where both sides are strings.
- left_side.ToRegister();
-
- // Here we split control flow to the stub call and inlined cases
- // before finally splitting it to the control destination. We use
- // a jump target and branching to duplicate the virtual frame at
- // the first split. We manually handle the off-frame references
- // by reconstituting them on the non-fall-through path.
- JumpTarget is_not_string, is_string;
- Register left_reg = left_side.reg();
- Handle<Object> right_val = right_side.handle();
- ASSERT(StringShape(String::cast(*right_val)).IsSymbol());
- __ test(left_side.reg(), Immediate(kSmiTagMask));
- is_not_string.Branch(zero, &left_side);
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(),
- FieldOperand(left_side.reg(), HeapObject::kMapOffset));
- __ movzx_b(temp.reg(),
- FieldOperand(temp.reg(), Map::kInstanceTypeOffset));
- // If we are testing for equality then make use of the symbol shortcut.
- // Check if the right left hand side has the same type as the left hand
- // side (which is always a symbol).
- if (cc == equal) {
- Label not_a_symbol;
- STATIC_ASSERT(kSymbolTag != 0);
- // Ensure that no non-strings have the symbol bit set.
- STATIC_ASSERT(LAST_TYPE < kNotStringTag + kIsSymbolMask);
- __ test(temp.reg(), Immediate(kIsSymbolMask)); // Test the symbol bit.
- __ j(zero, ¬_a_symbol);
- // They are symbols, so do identity compare.
- __ cmp(left_side.reg(), right_side.handle());
- dest->true_target()->Branch(equal);
- dest->false_target()->Branch(not_equal);
- __ bind(¬_a_symbol);
- }
- // Call the compare stub if the left side is not a flat ascii string.
- __ and_(temp.reg(),
- kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask);
- __ cmp(temp.reg(), kStringTag | kSeqStringTag | kAsciiStringTag);
- temp.Unuse();
- is_string.Branch(equal, &left_side);
-
- // Setup and call the compare stub.
- is_not_string.Bind(&left_side);
- CompareFlags flags =
- static_cast<CompareFlags>(CANT_BOTH_BE_NAN | NO_SMI_COMPARE_IN_STUB);
- CompareStub stub(cc, strict, flags);
- Result result = frame_->CallStub(&stub, &left_side, &right_side);
- result.ToRegister();
- __ cmp(result.reg(), 0);
- result.Unuse();
- dest->true_target()->Branch(cc);
- dest->false_target()->Jump();
-
- is_string.Bind(&left_side);
- // left_side is a sequential ASCII string.
- left_side = Result(left_reg);
- right_side = Result(right_val);
- // Test string equality and comparison.
- Label comparison_done;
- if (cc == equal) {
- __ cmp(FieldOperand(left_side.reg(), String::kLengthOffset),
- Immediate(Smi::FromInt(1)));
- __ j(not_equal, &comparison_done);
- uint8_t char_value =
- static_cast<uint8_t>(String::cast(*right_val)->Get(0));
- __ cmpb(FieldOperand(left_side.reg(), SeqAsciiString::kHeaderSize),
- char_value);
- } else {
- __ cmp(FieldOperand(left_side.reg(), String::kLengthOffset),
- Immediate(Smi::FromInt(1)));
- // If the length is 0 then the jump is taken and the flags
- // correctly represent being less than the one-character string.
- __ j(below, &comparison_done);
- // Compare the first character of the string with the
- // constant 1-character string.
- uint8_t char_value =
- static_cast<uint8_t>(String::cast(*right_val)->Get(0));
- __ cmpb(FieldOperand(left_side.reg(), SeqAsciiString::kHeaderSize),
- char_value);
- __ j(not_equal, &comparison_done);
- // If the first character is the same then the long string sorts after
- // the short one.
- __ cmp(FieldOperand(left_side.reg(), String::kLengthOffset),
- Immediate(Smi::FromInt(1)));
- }
- __ bind(&comparison_done);
- left_side.Unuse();
- right_side.Unuse();
- dest->Split(cc);
- }
- } else {
- // Neither side is a constant Smi, constant 1-char string or constant null.
- // If either side is a non-smi constant, or known to be a heap number,
- // skip the smi check.
- bool known_non_smi =
- (left_side.is_constant() && !left_side.handle()->IsSmi()) ||
- (right_side.is_constant() && !right_side.handle()->IsSmi()) ||
- left_side.type_info().IsDouble() ||
- right_side.type_info().IsDouble();
-
- NaNInformation nan_info =
- (CouldBeNaN(left_side) && CouldBeNaN(right_side)) ?
- kBothCouldBeNaN :
- kCantBothBeNaN;
-
- // Inline number comparison handling any combination of smi's and heap
- // numbers if:
- // code is in a loop
- // the compare operation is different from equal
- // compare is not a for-loop comparison
- // The reason for excluding equal is that it will most likely be done
- // with smi's (not heap numbers) and the code to comparing smi's is inlined
- // separately. The same reason applies for for-loop comparison which will
- // also most likely be smi comparisons.
- bool is_loop_condition = (node->AsExpression() != NULL)
- && node->AsExpression()->is_loop_condition();
- bool inline_number_compare =
- loop_nesting() > 0 && cc != equal && !is_loop_condition;
-
- // Left and right needed in registers for the following code.
- left_side.ToRegister();
- right_side.ToRegister();
-
- if (known_non_smi) {
- // Inlined equality check:
- // If at least one of the objects is not NaN, then if the objects
- // are identical, they are equal.
- if (nan_info == kCantBothBeNaN && cc == equal) {
- __ cmp(left_side.reg(), Operand(right_side.reg()));
- dest->true_target()->Branch(equal);
- }
-
- // Inlined number comparison:
- if (inline_number_compare) {
- GenerateInlineNumberComparison(&left_side, &right_side, cc, dest);
- }
-
- // End of in-line compare, call out to the compare stub. Don't include
- // number comparison in the stub if it was inlined.
- CompareFlags flags = ComputeCompareFlags(nan_info, inline_number_compare);
- CompareStub stub(cc, strict, flags);
- Result answer = frame_->CallStub(&stub, &left_side, &right_side);
- __ test(answer.reg(), Operand(answer.reg()));
- answer.Unuse();
- dest->Split(cc);
- } else {
- // Here we split control flow to the stub call and inlined cases
- // before finally splitting it to the control destination. We use
- // a jump target and branching to duplicate the virtual frame at
- // the first split. We manually handle the off-frame references
- // by reconstituting them on the non-fall-through path.
- JumpTarget is_smi;
- Register left_reg = left_side.reg();
- Register right_reg = right_side.reg();
-
- // In-line check for comparing two smis.
- JumpIfBothSmiUsingTypeInfo(&left_side, &right_side, &is_smi);
-
- if (has_valid_frame()) {
- // Inline the equality check if both operands can't be a NaN. If both
- // objects are the same they are equal.
- if (nan_info == kCantBothBeNaN && cc == equal) {
- __ cmp(left_side.reg(), Operand(right_side.reg()));
- dest->true_target()->Branch(equal);
- }
-
- // Inlined number comparison:
- if (inline_number_compare) {
- GenerateInlineNumberComparison(&left_side, &right_side, cc, dest);
- }
-
- // End of in-line compare, call out to the compare stub. Don't include
- // number comparison in the stub if it was inlined.
- CompareFlags flags =
- ComputeCompareFlags(nan_info, inline_number_compare);
- CompareStub stub(cc, strict, flags);
- Result answer = frame_->CallStub(&stub, &left_side, &right_side);
- __ test(answer.reg(), Operand(answer.reg()));
- answer.Unuse();
- if (is_smi.is_linked()) {
- dest->true_target()->Branch(cc);
- dest->false_target()->Jump();
- } else {
- dest->Split(cc);
- }
- }
-
- if (is_smi.is_linked()) {
- is_smi.Bind();
- left_side = Result(left_reg);
- right_side = Result(right_reg);
- __ cmp(left_side.reg(), Operand(right_side.reg()));
- right_side.Unuse();
- left_side.Unuse();
- dest->Split(cc);
- }
- }
- }
-}
-
-
-void CodeGenerator::ConstantSmiComparison(Condition cc,
- bool strict,
- ControlDestination* dest,
- Result* left_side,
- Result* right_side,
- bool left_side_constant_smi,
- bool right_side_constant_smi,
- bool is_loop_condition) {
- if (left_side_constant_smi && right_side_constant_smi) {
- // Trivial case, comparing two constants.
- int left_value = Smi::cast(*left_side->handle())->value();
- int right_value = Smi::cast(*right_side->handle())->value();
- switch (cc) {
- case less:
- dest->Goto(left_value < right_value);
- break;
- case equal:
- dest->Goto(left_value == right_value);
- break;
- case greater_equal:
- dest->Goto(left_value >= right_value);
- break;
- default:
- UNREACHABLE();
- }
- } else {
- // Only one side is a constant Smi.
- // If left side is a constant Smi, reverse the operands.
- // Since one side is a constant Smi, conversion order does not matter.
- if (left_side_constant_smi) {
- Result* temp = left_side;
- left_side = right_side;
- right_side = temp;
- cc = ReverseCondition(cc);
- // This may re-introduce greater or less_equal as the value of cc.
- // CompareStub and the inline code both support all values of cc.
- }
- // Implement comparison against a constant Smi, inlining the case
- // where both sides are Smis.
- left_side->ToRegister();
- Register left_reg = left_side->reg();
- Handle<Object> right_val = right_side->handle();
-
- if (left_side->is_smi()) {
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(left_reg);
- }
- // Test smi equality and comparison by signed int comparison.
- if (IsUnsafeSmi(right_side->handle())) {
- right_side->ToRegister();
- __ cmp(left_reg, Operand(right_side->reg()));
- } else {
- __ cmp(Operand(left_reg), Immediate(right_side->handle()));
- }
- left_side->Unuse();
- right_side->Unuse();
- dest->Split(cc);
- } else {
- // Only the case where the left side could possibly be a non-smi is left.
- JumpTarget is_smi;
- if (cc == equal) {
- // We can do the equality comparison before the smi check.
- __ cmp(Operand(left_reg), Immediate(right_side->handle()));
- dest->true_target()->Branch(equal);
- __ test(left_reg, Immediate(kSmiTagMask));
- dest->false_target()->Branch(zero);
- } else {
- // Do the smi check, then the comparison.
- __ test(left_reg, Immediate(kSmiTagMask));
- is_smi.Branch(zero, left_side, right_side);
- }
-
- // Jump or fall through to here if we are comparing a non-smi to a
- // constant smi. If the non-smi is a heap number and this is not
- // a loop condition, inline the floating point code.
- if (!is_loop_condition &&
- CpuFeatures::IsSupported(SSE2)) {
- // Right side is a constant smi and left side has been checked
- // not to be a smi.
- CpuFeatures::Scope use_sse2(SSE2);
- JumpTarget not_number;
- __ cmp(FieldOperand(left_reg, HeapObject::kMapOffset),
- Immediate(FACTORY->heap_number_map()));
- not_number.Branch(not_equal, left_side);
- __ movdbl(xmm1,
- FieldOperand(left_reg, HeapNumber::kValueOffset));
- int value = Smi::cast(*right_val)->value();
- if (value == 0) {
- __ xorpd(xmm0, xmm0);
- } else {
- Result temp = allocator()->Allocate();
- __ mov(temp.reg(), Immediate(value));
- __ cvtsi2sd(xmm0, Operand(temp.reg()));
- temp.Unuse();
- }
- __ ucomisd(xmm1, xmm0);
- // Jump to builtin for NaN.
- not_number.Branch(parity_even, left_side);
- left_side->Unuse();
- dest->true_target()->Branch(DoubleCondition(cc));
- dest->false_target()->Jump();
- not_number.Bind(left_side);
- }
-
- // Setup and call the compare stub.
- CompareFlags flags =
- static_cast<CompareFlags>(CANT_BOTH_BE_NAN | NO_SMI_CODE_IN_STUB);
- CompareStub stub(cc, strict, flags);
- Result result = frame_->CallStub(&stub, left_side, right_side);
- result.ToRegister();
- __ test(result.reg(), Operand(result.reg()));
- result.Unuse();
- if (cc == equal) {
- dest->Split(cc);
- } else {
- dest->true_target()->Branch(cc);
- dest->false_target()->Jump();
-
- // It is important for performance for this case to be at the end.
- is_smi.Bind(left_side, right_side);
- if (IsUnsafeSmi(right_side->handle())) {
- right_side->ToRegister();
- __ cmp(left_reg, Operand(right_side->reg()));
- } else {
- __ cmp(Operand(left_reg), Immediate(right_side->handle()));
- }
- left_side->Unuse();
- right_side->Unuse();
- dest->Split(cc);
- }
- }
- }
-}
-
-
-// Check that the comparison operand is a number. Jump to not_numbers jump
-// target passing the left and right result if the operand is not a number.
-static void CheckComparisonOperand(MacroAssembler* masm_,
- Result* operand,
- Result* left_side,
- Result* right_side,
- JumpTarget* not_numbers) {
- // Perform check if operand is not known to be a number.
- if (!operand->type_info().IsNumber()) {
- Label done;
- __ test(operand->reg(), Immediate(kSmiTagMask));
- __ j(zero, &done);
- __ cmp(FieldOperand(operand->reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->heap_number_map()));
- not_numbers->Branch(not_equal, left_side, right_side, not_taken);
- __ bind(&done);
- }
-}
-
-
-// Load a comparison operand to the FPU stack. This assumes that the operand has
-// already been checked and is a number.
-static void LoadComparisonOperand(MacroAssembler* masm_,
- Result* operand) {
- Label done;
- if (operand->type_info().IsDouble()) {
- // Operand is known to be a heap number, just load it.
- __ fld_d(FieldOperand(operand->reg(), HeapNumber::kValueOffset));
- } else if (operand->type_info().IsSmi()) {
- // Operand is known to be a smi. Convert it to double and keep the original
- // smi.
- __ SmiUntag(operand->reg());
- __ push(operand->reg());
- __ fild_s(Operand(esp, 0));
- __ pop(operand->reg());
- __ SmiTag(operand->reg());
- } else {
- // Operand type not known, check for smi otherwise assume heap number.
- Label smi;
- __ test(operand->reg(), Immediate(kSmiTagMask));
- __ j(zero, &smi);
- __ fld_d(FieldOperand(operand->reg(), HeapNumber::kValueOffset));
- __ jmp(&done);
- __ bind(&smi);
- __ SmiUntag(operand->reg());
- __ push(operand->reg());
- __ fild_s(Operand(esp, 0));
- __ pop(operand->reg());
- __ SmiTag(operand->reg());
- __ jmp(&done);
- }
- __ bind(&done);
-}
-
-
-// Load a comparison operand into into a XMM register. Jump to not_numbers jump
-// target passing the left and right result if the operand is not a number.
-static void LoadComparisonOperandSSE2(MacroAssembler* masm_,
- Result* operand,
- XMMRegister xmm_reg,
- Result* left_side,
- Result* right_side,
- JumpTarget* not_numbers) {
- Label done;
- if (operand->type_info().IsDouble()) {
- // Operand is known to be a heap number, just load it.
- __ movdbl(xmm_reg, FieldOperand(operand->reg(), HeapNumber::kValueOffset));
- } else if (operand->type_info().IsSmi()) {
- // Operand is known to be a smi. Convert it to double and keep the original
- // smi.
- __ SmiUntag(operand->reg());
- __ cvtsi2sd(xmm_reg, Operand(operand->reg()));
- __ SmiTag(operand->reg());
- } else {
- // Operand type not known, check for smi or heap number.
- Label smi;
- __ test(operand->reg(), Immediate(kSmiTagMask));
- __ j(zero, &smi);
- if (!operand->type_info().IsNumber()) {
- __ cmp(FieldOperand(operand->reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->heap_number_map()));
- not_numbers->Branch(not_equal, left_side, right_side, taken);
- }
- __ movdbl(xmm_reg, FieldOperand(operand->reg(), HeapNumber::kValueOffset));
- __ jmp(&done);
-
- __ bind(&smi);
- // Comvert smi to float and keep the original smi.
- __ SmiUntag(operand->reg());
- __ cvtsi2sd(xmm_reg, Operand(operand->reg()));
- __ SmiTag(operand->reg());
- __ jmp(&done);
- }
- __ bind(&done);
-}
-
-
-void CodeGenerator::GenerateInlineNumberComparison(Result* left_side,
- Result* right_side,
- Condition cc,
- ControlDestination* dest) {
- ASSERT(left_side->is_register());
- ASSERT(right_side->is_register());
-
- JumpTarget not_numbers;
- if (CpuFeatures::IsSupported(SSE2)) {
- CpuFeatures::Scope use_sse2(SSE2);
-
- // Load left and right operand into registers xmm0 and xmm1 and compare.
- LoadComparisonOperandSSE2(masm_, left_side, xmm0, left_side, right_side,
- ¬_numbers);
- LoadComparisonOperandSSE2(masm_, right_side, xmm1, left_side, right_side,
- ¬_numbers);
- __ ucomisd(xmm0, xmm1);
- } else {
- Label check_right, compare;
-
- // Make sure that both comparison operands are numbers.
- CheckComparisonOperand(masm_, left_side, left_side, right_side,
- ¬_numbers);
- CheckComparisonOperand(masm_, right_side, left_side, right_side,
- ¬_numbers);
-
- // Load right and left operand to FPU stack and compare.
- LoadComparisonOperand(masm_, right_side);
- LoadComparisonOperand(masm_, left_side);
- __ FCmp();
- }
-
- // Bail out if a NaN is involved.
- not_numbers.Branch(parity_even, left_side, right_side, not_taken);
-
- // Split to destination targets based on comparison.
- left_side->Unuse();
- right_side->Unuse();
- dest->true_target()->Branch(DoubleCondition(cc));
- dest->false_target()->Jump();
-
- not_numbers.Bind(left_side, right_side);
-}
-
-
-// Call the function just below TOS on the stack with the given
-// arguments. The receiver is the TOS.
-void CodeGenerator::CallWithArguments(ZoneList<Expression*>* args,
- CallFunctionFlags flags,
- int position) {
- // Push the arguments ("left-to-right") on the stack.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Record the position for debugging purposes.
- CodeForSourcePosition(position);
-
- // Use the shared code stub to call the function.
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- CallFunctionStub call_function(arg_count, in_loop, flags);
- Result answer = frame_->CallStub(&call_function, arg_count + 1);
- // Restore context and replace function on the stack with the
- // result of the stub invocation.
- frame_->RestoreContextRegister();
- frame_->SetElementAt(0, &answer);
-}
-
-
-void CodeGenerator::CallApplyLazy(Expression* applicand,
- Expression* receiver,
- VariableProxy* arguments,
- int position) {
- // An optimized implementation of expressions of the form
- // x.apply(y, arguments).
- // If the arguments object of the scope has not been allocated,
- // and x.apply is Function.prototype.apply, this optimization
- // just copies y and the arguments of the current function on the
- // stack, as receiver and arguments, and calls x.
- // In the implementation comments, we call x the applicand
- // and y the receiver.
- ASSERT(ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION);
- ASSERT(arguments->IsArguments());
-
- // Load applicand.apply onto the stack. This will usually
- // give us a megamorphic load site. Not super, but it works.
- Load(applicand);
- frame()->Dup();
- Handle<String> name = FACTORY->LookupAsciiSymbol("apply");
- frame()->Push(name);
- Result answer = frame()->CallLoadIC(RelocInfo::CODE_TARGET);
- __ nop();
- frame()->Push(&answer);
-
- // Load the receiver and the existing arguments object onto the
- // expression stack. Avoid allocating the arguments object here.
- Load(receiver);
- LoadFromSlot(scope()->arguments()->AsSlot(), NOT_INSIDE_TYPEOF);
-
- // Emit the source position information after having loaded the
- // receiver and the arguments.
- CodeForSourcePosition(position);
- // Contents of frame at this point:
- // Frame[0]: arguments object of the current function or the hole.
- // Frame[1]: receiver
- // Frame[2]: applicand.apply
- // Frame[3]: applicand.
-
- // Check if the arguments object has been lazily allocated
- // already. If so, just use that instead of copying the arguments
- // from the stack. This also deals with cases where a local variable
- // named 'arguments' has been introduced.
- frame_->Dup();
- Result probe = frame_->Pop();
- { VirtualFrame::SpilledScope spilled_scope;
- Label slow, done;
- bool try_lazy = true;
- if (probe.is_constant()) {
- try_lazy = probe.handle()->IsArgumentsMarker();
- } else {
- __ cmp(Operand(probe.reg()), Immediate(FACTORY->arguments_marker()));
- probe.Unuse();
- __ j(not_equal, &slow);
- }
-
- if (try_lazy) {
- Label build_args;
- // Get rid of the arguments object probe.
- frame_->Drop(); // Can be called on a spilled frame.
- // Stack now has 3 elements on it.
- // Contents of stack at this point:
- // esp[0]: receiver
- // esp[1]: applicand.apply
- // esp[2]: applicand.
-
- // Check that the receiver really is a JavaScript object.
- __ mov(eax, Operand(esp, 0));
- __ test(eax, Immediate(kSmiTagMask));
- __ j(zero, &build_args);
- // We allow all JSObjects including JSFunctions. As long as
- // JS_FUNCTION_TYPE is the last instance type and it is right
- // after LAST_JS_OBJECT_TYPE, we do not have to check the upper
- // bound.
- STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
- STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
- __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx);
- __ j(below, &build_args);
-
- // Check that applicand.apply is Function.prototype.apply.
- __ mov(eax, Operand(esp, kPointerSize));
- __ test(eax, Immediate(kSmiTagMask));
- __ j(zero, &build_args);
- __ CmpObjectType(eax, JS_FUNCTION_TYPE, ecx);
- __ j(not_equal, &build_args);
- __ mov(ecx, FieldOperand(eax, JSFunction::kCodeEntryOffset));
- __ sub(Operand(ecx), Immediate(Code::kHeaderSize - kHeapObjectTag));
- Handle<Code> apply_code(masm()->isolate()->builtins()->builtin(
- Builtins::kFunctionApply));
- __ cmp(Operand(ecx), Immediate(apply_code));
- __ j(not_equal, &build_args);
-
- // Check that applicand is a function.
- __ mov(edi, Operand(esp, 2 * kPointerSize));
- __ test(edi, Immediate(kSmiTagMask));
- __ j(zero, &build_args);
- __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
- __ j(not_equal, &build_args);
-
- // Copy the arguments to this function possibly from the
- // adaptor frame below it.
- Label invoke, adapted;
- __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
- __ mov(ecx, Operand(edx, StandardFrameConstants::kContextOffset));
- __ cmp(Operand(ecx),
- Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
- __ j(equal, &adapted);
-
- // No arguments adaptor frame. Copy fixed number of arguments.
- __ mov(eax, Immediate(scope()->num_parameters()));
- for (int i = 0; i < scope()->num_parameters(); i++) {
- __ push(frame_->ParameterAt(i));
- }
- __ jmp(&invoke);
-
- // Arguments adaptor frame present. Copy arguments from there, but
- // avoid copying too many arguments to avoid stack overflows.
- __ bind(&adapted);
- static const uint32_t kArgumentsLimit = 1 * KB;
- __ mov(eax, Operand(edx, ArgumentsAdaptorFrameConstants::kLengthOffset));
- __ SmiUntag(eax);
- __ mov(ecx, Operand(eax));
- __ cmp(eax, kArgumentsLimit);
- __ j(above, &build_args);
-
- // Loop through the arguments pushing them onto the execution
- // stack. We don't inform the virtual frame of the push, so we don't
- // have to worry about getting rid of the elements from the virtual
- // frame.
- Label loop;
- // ecx is a small non-negative integer, due to the test above.
- __ test(ecx, Operand(ecx));
- __ j(zero, &invoke);
- __ bind(&loop);
- __ push(Operand(edx, ecx, times_pointer_size, 1 * kPointerSize));
- __ dec(ecx);
- __ j(not_zero, &loop);
-
- // Invoke the function.
- __ bind(&invoke);
- ParameterCount actual(eax);
- __ InvokeFunction(edi, actual, CALL_FUNCTION);
- // Drop applicand.apply and applicand from the stack, and push
- // the result of the function call, but leave the spilled frame
- // unchanged, with 3 elements, so it is correct when we compile the
- // slow-case code.
- __ add(Operand(esp), Immediate(2 * kPointerSize));
- __ push(eax);
- // Stack now has 1 element:
- // esp[0]: result
- __ jmp(&done);
-
- // Slow-case: Allocate the arguments object since we know it isn't
- // there, and fall-through to the slow-case where we call
- // applicand.apply.
- __ bind(&build_args);
- // Stack now has 3 elements, because we have jumped from where:
- // esp[0]: receiver
- // esp[1]: applicand.apply
- // esp[2]: applicand.
-
- // StoreArgumentsObject requires a correct frame, and may modify it.
- Result arguments_object = StoreArgumentsObject(false);
- frame_->SpillAll();
- arguments_object.ToRegister();
- frame_->EmitPush(arguments_object.reg());
- arguments_object.Unuse();
- // Stack and frame now have 4 elements.
- __ bind(&slow);
- }
-
- // Generic computation of x.apply(y, args) with no special optimization.
- // Flip applicand.apply and applicand on the stack, so
- // applicand looks like the receiver of the applicand.apply call.
- // Then process it as a normal function call.
- __ mov(eax, Operand(esp, 3 * kPointerSize));
- __ mov(ebx, Operand(esp, 2 * kPointerSize));
- __ mov(Operand(esp, 2 * kPointerSize), eax);
- __ mov(Operand(esp, 3 * kPointerSize), ebx);
-
- CallFunctionStub call_function(2, NOT_IN_LOOP, NO_CALL_FUNCTION_FLAGS);
- Result res = frame_->CallStub(&call_function, 3);
- // The function and its two arguments have been dropped.
- frame_->Drop(1); // Drop the receiver as well.
- res.ToRegister();
- frame_->EmitPush(res.reg());
- // Stack now has 1 element:
- // esp[0]: result
- if (try_lazy) __ bind(&done);
- } // End of spilled scope.
- // Restore the context register after a call.
- frame_->RestoreContextRegister();
-}
-
-
-class DeferredStackCheck: public DeferredCode {
- public:
- DeferredStackCheck() {
- set_comment("[ DeferredStackCheck");
- }
-
- virtual void Generate();
-};
-
-
-void DeferredStackCheck::Generate() {
- StackCheckStub stub;
- __ CallStub(&stub);
-}
-
-
-void CodeGenerator::CheckStack() {
- DeferredStackCheck* deferred = new DeferredStackCheck;
- ExternalReference stack_limit =
- ExternalReference::address_of_stack_limit(masm()->isolate());
- __ cmp(esp, Operand::StaticVariable(stack_limit));
- deferred->Branch(below);
- deferred->BindExit();
-}
-
-
-void CodeGenerator::VisitAndSpill(Statement* statement) {
- ASSERT(in_spilled_code());
- set_in_spilled_code(false);
- Visit(statement);
- if (frame_ != NULL) {
- frame_->SpillAll();
- }
- set_in_spilled_code(true);
-}
-
-
-void CodeGenerator::VisitStatementsAndSpill(ZoneList<Statement*>* statements) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- ASSERT(in_spilled_code());
- set_in_spilled_code(false);
- VisitStatements(statements);
- if (frame_ != NULL) {
- frame_->SpillAll();
- }
- set_in_spilled_code(true);
-
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitStatements(ZoneList<Statement*>* statements) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- ASSERT(!in_spilled_code());
- for (int i = 0; has_valid_frame() && i < statements->length(); i++) {
- Visit(statements->at(i));
- }
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitBlock(Block* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ Block");
- CodeForStatementPosition(node);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- VisitStatements(node->statements());
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
- // Call the runtime to declare the globals. The inevitable call
- // will sync frame elements to memory anyway, so we do it eagerly to
- // allow us to push the arguments directly into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
-
- frame_->EmitPush(esi); // The context is the first argument.
- frame_->EmitPush(Immediate(pairs));
- frame_->EmitPush(Immediate(Smi::FromInt(is_eval() ? 1 : 0)));
- frame_->EmitPush(Immediate(Smi::FromInt(strict_mode_flag())));
- Result ignored = frame_->CallRuntime(Runtime::kDeclareGlobals, 4);
- // Return value is ignored.
-}
-
-
-void CodeGenerator::VisitDeclaration(Declaration* node) {
- Comment cmnt(masm_, "[ Declaration");
- Variable* var = node->proxy()->var();
- ASSERT(var != NULL); // must have been resolved
- Slot* slot = var->AsSlot();
-
- // If it was not possible to allocate the variable at compile time,
- // we need to "declare" it at runtime to make sure it actually
- // exists in the local context.
- if (slot != NULL && slot->type() == Slot::LOOKUP) {
- // Variables with a "LOOKUP" slot were introduced as non-locals
- // during variable resolution and must have mode DYNAMIC.
- ASSERT(var->is_dynamic());
- // For now, just do a runtime call. Sync the virtual frame eagerly
- // so we can simply push the arguments into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(esi);
- frame_->EmitPush(Immediate(var->name()));
- // Declaration nodes are always introduced in one of two modes.
- ASSERT(node->mode() == Variable::VAR || node->mode() == Variable::CONST);
- PropertyAttributes attr = node->mode() == Variable::VAR ? NONE : READ_ONLY;
- frame_->EmitPush(Immediate(Smi::FromInt(attr)));
- // Push initial value, if any.
- // Note: For variables we must not push an initial value (such as
- // 'undefined') because we may have a (legal) redeclaration and we
- // must not destroy the current value.
- if (node->mode() == Variable::CONST) {
- frame_->EmitPush(Immediate(FACTORY->the_hole_value()));
- } else if (node->fun() != NULL) {
- Load(node->fun());
- } else {
- frame_->EmitPush(Immediate(Smi::FromInt(0))); // no initial value!
- }
- Result ignored = frame_->CallRuntime(Runtime::kDeclareContextSlot, 4);
- // Ignore the return value (declarations are statements).
- return;
- }
-
- ASSERT(!var->is_global());
-
- // If we have a function or a constant, we need to initialize the variable.
- Expression* val = NULL;
- if (node->mode() == Variable::CONST) {
- val = new Literal(FACTORY->the_hole_value());
- } else {
- val = node->fun(); // NULL if we don't have a function
- }
-
- if (val != NULL) {
- {
- // Set the initial value.
- Reference target(this, node->proxy());
- Load(val);
- target.SetValue(NOT_CONST_INIT);
- // The reference is removed from the stack (preserving TOS) when
- // it goes out of scope.
- }
- // Get rid of the assigned value (declarations are statements).
- frame_->Drop();
- }
-}
-
-
-void CodeGenerator::VisitExpressionStatement(ExpressionStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ExpressionStatement");
- CodeForStatementPosition(node);
- Expression* expression = node->expression();
- expression->MarkAsStatement();
- Load(expression);
- // Remove the lingering expression result from the top of stack.
- frame_->Drop();
-}
-
-
-void CodeGenerator::VisitEmptyStatement(EmptyStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "// EmptyStatement");
- CodeForStatementPosition(node);
- // nothing to do
-}
-
-
-void CodeGenerator::VisitIfStatement(IfStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ IfStatement");
- // Generate different code depending on which parts of the if statement
- // are present or not.
- bool has_then_stm = node->HasThenStatement();
- bool has_else_stm = node->HasElseStatement();
-
- CodeForStatementPosition(node);
- JumpTarget exit;
- if (has_then_stm && has_else_stm) {
- JumpTarget then;
- JumpTarget else_;
- ControlDestination dest(&then, &else_, true);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // The else target was bound, so we compile the else part first.
- Visit(node->else_statement());
-
- // We may have dangling jumps to the then part.
- if (then.is_linked()) {
- if (has_valid_frame()) exit.Jump();
- then.Bind();
- Visit(node->then_statement());
- }
- } else {
- // The then target was bound, so we compile the then part first.
- Visit(node->then_statement());
-
- if (else_.is_linked()) {
- if (has_valid_frame()) exit.Jump();
- else_.Bind();
- Visit(node->else_statement());
- }
- }
-
- } else if (has_then_stm) {
- ASSERT(!has_else_stm);
- JumpTarget then;
- ControlDestination dest(&then, &exit, true);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // The exit label was bound. We may have dangling jumps to the
- // then part.
- if (then.is_linked()) {
- exit.Unuse();
- exit.Jump();
- then.Bind();
- Visit(node->then_statement());
- }
- } else {
- // The then label was bound.
- Visit(node->then_statement());
- }
-
- } else if (has_else_stm) {
- ASSERT(!has_then_stm);
- JumpTarget else_;
- ControlDestination dest(&exit, &else_, false);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.true_was_fall_through()) {
- // The exit label was bound. We may have dangling jumps to the
- // else part.
- if (else_.is_linked()) {
- exit.Unuse();
- exit.Jump();
- else_.Bind();
- Visit(node->else_statement());
- }
- } else {
- // The else label was bound.
- Visit(node->else_statement());
- }
-
- } else {
- ASSERT(!has_then_stm && !has_else_stm);
- // We only care about the condition's side effects (not its value
- // or control flow effect). LoadCondition is called without
- // forcing control flow.
- ControlDestination dest(&exit, &exit, true);
- LoadCondition(node->condition(), &dest, false);
- if (!dest.is_used()) {
- // We got a value on the frame rather than (or in addition to)
- // control flow.
- frame_->Drop();
- }
- }
-
- if (exit.is_linked()) {
- exit.Bind();
- }
-}
-
-
-void CodeGenerator::VisitContinueStatement(ContinueStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ContinueStatement");
- CodeForStatementPosition(node);
- node->target()->continue_target()->Jump();
-}
-
-
-void CodeGenerator::VisitBreakStatement(BreakStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ BreakStatement");
- CodeForStatementPosition(node);
- node->target()->break_target()->Jump();
-}
-
-
-void CodeGenerator::VisitReturnStatement(ReturnStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ReturnStatement");
-
- CodeForStatementPosition(node);
- Load(node->expression());
- Result return_value = frame_->Pop();
- masm()->positions_recorder()->WriteRecordedPositions();
- if (function_return_is_shadowed_) {
- function_return_.Jump(&return_value);
- } else {
- frame_->PrepareForReturn();
- if (function_return_.is_bound()) {
- // If the function return label is already bound we reuse the
- // code by jumping to the return site.
- function_return_.Jump(&return_value);
- } else {
- function_return_.Bind(&return_value);
- GenerateReturnSequence(&return_value);
- }
- }
-}
-
-
-void CodeGenerator::GenerateReturnSequence(Result* return_value) {
- // The return value is a live (but not currently reference counted)
- // reference to eax. This is safe because the current frame does not
- // contain a reference to eax (it is prepared for the return by spilling
- // all registers).
- if (FLAG_trace) {
- frame_->Push(return_value);
- *return_value = frame_->CallRuntime(Runtime::kTraceExit, 1);
- }
- return_value->ToRegister(eax);
-
- // Add a label for checking the size of the code used for returning.
-#ifdef DEBUG
- Label check_exit_codesize;
- masm_->bind(&check_exit_codesize);
-#endif
-
- // Leave the frame and return popping the arguments and the
- // receiver.
- frame_->Exit();
- int arguments_bytes = (scope()->num_parameters() + 1) * kPointerSize;
- __ Ret(arguments_bytes, ecx);
- DeleteFrame();
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
- // Check that the size of the code used for returning is large enough
- // for the debugger's requirements.
- ASSERT(Assembler::kJSReturnSequenceLength <=
- masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
-#endif
-}
-
-
-void CodeGenerator::VisitWithEnterStatement(WithEnterStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ WithEnterStatement");
- CodeForStatementPosition(node);
- Load(node->expression());
- Result context;
- if (node->is_catch_block()) {
- context = frame_->CallRuntime(Runtime::kPushCatchContext, 1);
- } else {
- context = frame_->CallRuntime(Runtime::kPushContext, 1);
- }
-
- // Update context local.
- frame_->SaveContextRegister();
-
- // Verify that the runtime call result and esi agree.
- if (FLAG_debug_code) {
- __ cmp(context.reg(), Operand(esi));
- __ Assert(equal, "Runtime::NewContext should end up in esi");
- }
-}
-
-
-void CodeGenerator::VisitWithExitStatement(WithExitStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ WithExitStatement");
- CodeForStatementPosition(node);
- // Pop context.
- __ mov(esi, ContextOperand(esi, Context::PREVIOUS_INDEX));
- // Update context local.
- frame_->SaveContextRegister();
-}
-
-
-void CodeGenerator::VisitSwitchStatement(SwitchStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ SwitchStatement");
- CodeForStatementPosition(node);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
-
- // Compile the switch value.
- Load(node->tag());
-
- ZoneList<CaseClause*>* cases = node->cases();
- int length = cases->length();
- CaseClause* default_clause = NULL;
-
- JumpTarget next_test;
- // Compile the case label expressions and comparisons. Exit early
- // if a comparison is unconditionally true. The target next_test is
- // bound before the loop in order to indicate control flow to the
- // first comparison.
- next_test.Bind();
- for (int i = 0; i < length && !next_test.is_unused(); i++) {
- CaseClause* clause = cases->at(i);
- // The default is not a test, but remember it for later.
- if (clause->is_default()) {
- default_clause = clause;
- continue;
- }
-
- Comment cmnt(masm_, "[ Case comparison");
- // We recycle the same target next_test for each test. Bind it if
- // the previous test has not done so and then unuse it for the
- // loop.
- if (next_test.is_linked()) {
- next_test.Bind();
- }
- next_test.Unuse();
-
- // Duplicate the switch value.
- frame_->Dup();
-
- // Compile the label expression.
- Load(clause->label());
-
- // Compare and branch to the body if true or the next test if
- // false. Prefer the next test as a fall through.
- ControlDestination dest(clause->body_target(), &next_test, false);
- Comparison(node, equal, true, &dest);
-
- // If the comparison fell through to the true target, jump to the
- // actual body.
- if (dest.true_was_fall_through()) {
- clause->body_target()->Unuse();
- clause->body_target()->Jump();
- }
- }
-
- // If there was control flow to a next test from the last one
- // compiled, compile a jump to the default or break target.
- if (!next_test.is_unused()) {
- if (next_test.is_linked()) {
- next_test.Bind();
- }
- // Drop the switch value.
- frame_->Drop();
- if (default_clause != NULL) {
- default_clause->body_target()->Jump();
- } else {
- node->break_target()->Jump();
- }
- }
-
- // The last instruction emitted was a jump, either to the default
- // clause or the break target, or else to a case body from the loop
- // that compiles the tests.
- ASSERT(!has_valid_frame());
- // Compile case bodies as needed.
- for (int i = 0; i < length; i++) {
- CaseClause* clause = cases->at(i);
-
- // There are two ways to reach the body: from the corresponding
- // test or as the fall through of the previous body.
- if (clause->body_target()->is_linked() || has_valid_frame()) {
- if (clause->body_target()->is_linked()) {
- if (has_valid_frame()) {
- // If we have both a jump to the test and a fall through, put
- // a jump on the fall through path to avoid the dropping of
- // the switch value on the test path. The exception is the
- // default which has already had the switch value dropped.
- if (clause->is_default()) {
- clause->body_target()->Bind();
- } else {
- JumpTarget body;
- body.Jump();
- clause->body_target()->Bind();
- frame_->Drop();
- body.Bind();
- }
- } else {
- // No fall through to worry about.
- clause->body_target()->Bind();
- if (!clause->is_default()) {
- frame_->Drop();
- }
- }
- } else {
- // Otherwise, we have only fall through.
- ASSERT(has_valid_frame());
- }
-
- // We are now prepared to compile the body.
- Comment cmnt(masm_, "[ Case body");
- VisitStatements(clause->statements());
- }
- clause->body_target()->Unuse();
- }
-
- // We may not have a valid frame here so bind the break target only
- // if needed.
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::VisitDoWhileStatement(DoWhileStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ DoWhileStatement");
- CodeForStatementPosition(node);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- JumpTarget body(JumpTarget::BIDIRECTIONAL);
- IncrementLoopNesting();
-
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- // Label the top of the loop for the backward jump if necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // Use the continue target.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- break;
- case ALWAYS_FALSE:
- // No need to label it.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- break;
- case DONT_KNOW:
- // Continue is the test, so use the backward body target.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- body.Bind();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- // Compile the test.
- switch (info) {
- case ALWAYS_TRUE:
- // If control flow can fall off the end of the body, jump back
- // to the top and bind the break target at the exit.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- break;
- case ALWAYS_FALSE:
- // We may have had continues or breaks in the body.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- break;
- case DONT_KNOW:
- // We have to compile the test expression if it can be reached by
- // control flow falling out of the body or via continue.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (has_valid_frame()) {
- Comment cmnt(masm_, "[ DoWhileCondition");
- CodeForDoWhileConditionPosition(node);
- ControlDestination dest(&body, node->break_target(), false);
- LoadCondition(node->cond(), &dest, true);
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- break;
- }
-
- DecrementLoopNesting();
- node->continue_target()->Unuse();
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::VisitWhileStatement(WhileStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ WhileStatement");
- CodeForStatementPosition(node);
-
- // If the condition is always false and has no side effects, we do not
- // need to compile anything.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- if (info == ALWAYS_FALSE) return;
-
- // Do not duplicate conditions that may have function literal
- // subexpressions. This can cause us to compile the function literal
- // twice.
- bool test_at_bottom = !node->may_have_function_literal();
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- IncrementLoopNesting();
- JumpTarget body;
- if (test_at_bottom) {
- body.set_direction(JumpTarget::BIDIRECTIONAL);
- }
-
- // Based on the condition analysis, compile the test as necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // We will not compile the test expression. Label the top of the
- // loop with the continue target.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- break;
- case DONT_KNOW: {
- if (test_at_bottom) {
- // Continue is the test at the bottom, no need to label the test
- // at the top. The body is a backward target.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- } else {
- // Label the test at the top as the continue target. The body
- // is a forward-only target.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- }
- // Compile the test with the body as the true target and preferred
- // fall-through and with the break target as the false target.
- ControlDestination dest(&body, node->break_target(), true);
- LoadCondition(node->cond(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // If we got the break target as fall-through, the test may have
- // been unconditionally false (if there are no jumps to the
- // body).
- if (!body.is_linked()) {
- DecrementLoopNesting();
- return;
- }
-
- // Otherwise, jump around the body on the fall through and then
- // bind the body target.
- node->break_target()->Unuse();
- node->break_target()->Jump();
- body.Bind();
- }
- break;
- }
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- // Based on the condition analysis, compile the backward jump as
- // necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // The loop body has been labeled with the continue target.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- break;
- case DONT_KNOW:
- if (test_at_bottom) {
- // If we have chosen to recompile the test at the bottom,
- // then it is the continue target.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (has_valid_frame()) {
- // The break target is the fall-through (body is a backward
- // jump from here and thus an invalid fall-through).
- ControlDestination dest(&body, node->break_target(), false);
- LoadCondition(node->cond(), &dest, true);
- }
- } else {
- // If we have chosen not to recompile the test at the bottom,
- // jump back to the one at the top.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- }
- break;
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- // The break target may be already bound (by the condition), or there
- // may not be a valid frame. Bind it only if needed.
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
-}
-
-
-void CodeGenerator::SetTypeForStackSlot(Slot* slot, TypeInfo info) {
- ASSERT(slot->type() == Slot::LOCAL || slot->type() == Slot::PARAMETER);
- if (slot->type() == Slot::LOCAL) {
- frame_->SetTypeForLocalAt(slot->index(), info);
- } else {
- frame_->SetTypeForParamAt(slot->index(), info);
- }
- if (FLAG_debug_code && info.IsSmi()) {
- if (slot->type() == Slot::LOCAL) {
- frame_->PushLocalAt(slot->index());
- } else {
- frame_->PushParameterAt(slot->index());
- }
- Result var = frame_->Pop();
- var.ToRegister();
- __ AbortIfNotSmi(var.reg());
- }
-}
-
-
-void CodeGenerator::VisitForStatement(ForStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ForStatement");
- CodeForStatementPosition(node);
-
- // Compile the init expression if present.
- if (node->init() != NULL) {
- Visit(node->init());
- }
-
- // If the condition is always false and has no side effects, we do not
- // need to compile anything else.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- if (info == ALWAYS_FALSE) return;
-
- // Do not duplicate conditions that may have function literal
- // subexpressions. This can cause us to compile the function literal
- // twice.
- bool test_at_bottom = !node->may_have_function_literal();
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- IncrementLoopNesting();
-
- // Target for backward edge if no test at the bottom, otherwise
- // unused.
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
-
- // Target for backward edge if there is a test at the bottom,
- // otherwise used as target for test at the top.
- JumpTarget body;
- if (test_at_bottom) {
- body.set_direction(JumpTarget::BIDIRECTIONAL);
- }
-
- // Based on the condition analysis, compile the test as necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // We will not compile the test expression. Label the top of the
- // loop.
- if (node->next() == NULL) {
- // Use the continue target if there is no update expression.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- } else {
- // Otherwise use the backward loop target.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- loop.Bind();
- }
- break;
- case DONT_KNOW: {
- if (test_at_bottom) {
- // Continue is either the update expression or the test at the
- // bottom, no need to label the test at the top.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- } else if (node->next() == NULL) {
- // We are not recompiling the test at the bottom and there is no
- // update expression.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- } else {
- // We are not recompiling the test at the bottom and there is an
- // update expression.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- loop.Bind();
- }
-
- // Compile the test with the body as the true target and preferred
- // fall-through and with the break target as the false target.
- ControlDestination dest(&body, node->break_target(), true);
- LoadCondition(node->cond(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // If we got the break target as fall-through, the test may have
- // been unconditionally false (if there are no jumps to the
- // body).
- if (!body.is_linked()) {
- DecrementLoopNesting();
- return;
- }
-
- // Otherwise, jump around the body on the fall through and then
- // bind the body target.
- node->break_target()->Unuse();
- node->break_target()->Jump();
- body.Bind();
- }
- break;
- }
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
-
- // We know that the loop index is a smi if it is not modified in the
- // loop body and it is checked against a constant limit in the loop
- // condition. In this case, we reset the static type information of the
- // loop index to smi before compiling the body, the update expression, and
- // the bottom check of the loop condition.
- if (node->is_fast_smi_loop()) {
- // Set number type of the loop variable to smi.
- SetTypeForStackSlot(node->loop_variable()->AsSlot(), TypeInfo::Smi());
- }
-
- Visit(node->body());
-
- // If there is an update expression, compile it if necessary.
- if (node->next() != NULL) {
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
-
- // Control can reach the update by falling out of the body or by a
- // continue.
- if (has_valid_frame()) {
- // Record the source position of the statement as this code which
- // is after the code for the body actually belongs to the loop
- // statement and not the body.
- CodeForStatementPosition(node);
- Visit(node->next());
- }
- }
-
- // Set the type of the loop variable to smi before compiling the test
- // expression if we are in a fast smi loop condition.
- if (node->is_fast_smi_loop() && has_valid_frame()) {
- // Set number type of the loop variable to smi.
- SetTypeForStackSlot(node->loop_variable()->AsSlot(), TypeInfo::Smi());
- }
-
- // Based on the condition analysis, compile the backward jump as
- // necessary.
- switch (info) {
- case ALWAYS_TRUE:
- if (has_valid_frame()) {
- if (node->next() == NULL) {
- node->continue_target()->Jump();
- } else {
- loop.Jump();
- }
- }
- break;
- case DONT_KNOW:
- if (test_at_bottom) {
- if (node->continue_target()->is_linked()) {
- // We can have dangling jumps to the continue target if there
- // was no update expression.
- node->continue_target()->Bind();
- }
- // Control can reach the test at the bottom by falling out of
- // the body, by a continue in the body, or from the update
- // expression.
- if (has_valid_frame()) {
- // The break target is the fall-through (body is a backward
- // jump from here).
- ControlDestination dest(&body, node->break_target(), false);
- LoadCondition(node->cond(), &dest, true);
- }
- } else {
- // Otherwise, jump back to the test at the top.
- if (has_valid_frame()) {
- if (node->next() == NULL) {
- node->continue_target()->Jump();
- } else {
- loop.Jump();
- }
- }
- }
- break;
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- // The break target may be already bound (by the condition), or there
- // may not be a valid frame. Bind it only if needed.
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
-}
-
-
-void CodeGenerator::VisitForInStatement(ForInStatement* node) {
- ASSERT(!in_spilled_code());
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ ForInStatement");
- CodeForStatementPosition(node);
-
- JumpTarget primitive;
- JumpTarget jsobject;
- JumpTarget fixed_array;
- JumpTarget entry(JumpTarget::BIDIRECTIONAL);
- JumpTarget end_del_check;
- JumpTarget exit;
-
- // Get the object to enumerate over (converted to JSObject).
- LoadAndSpill(node->enumerable());
-
- // Both SpiderMonkey and kjs ignore null and undefined in contrast
- // to the specification. 12.6.4 mandates a call to ToObject.
- frame_->EmitPop(eax);
-
- // eax: value to be iterated over
- __ cmp(eax, FACTORY->undefined_value());
- exit.Branch(equal);
- __ cmp(eax, FACTORY->null_value());
- exit.Branch(equal);
-
- // Stack layout in body:
- // [iteration counter (smi)] <- slot 0
- // [length of array] <- slot 1
- // [FixedArray] <- slot 2
- // [Map or 0] <- slot 3
- // [Object] <- slot 4
-
- // Check if enumerable is already a JSObject
- // eax: value to be iterated over
- __ test(eax, Immediate(kSmiTagMask));
- primitive.Branch(zero);
- __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx);
- jsobject.Branch(above_equal);
-
- primitive.Bind();
- frame_->EmitPush(eax);
- frame_->InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION, 1);
- // function call returns the value in eax, which is where we want it below
-
- jsobject.Bind();
- // Get the set of properties (as a FixedArray or Map).
- // eax: value to be iterated over
- frame_->EmitPush(eax); // Push the object being iterated over.
-
- // Check cache validity in generated code. This is a fast case for
- // the JSObject::IsSimpleEnum cache validity checks. If we cannot
- // guarantee cache validity, call the runtime system to check cache
- // validity or get the property names in a fixed array.
- JumpTarget call_runtime;
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
- JumpTarget check_prototype;
- JumpTarget use_cache;
- __ mov(ecx, eax);
- loop.Bind();
- // Check that there are no elements.
- __ mov(edx, FieldOperand(ecx, JSObject::kElementsOffset));
- __ cmp(Operand(edx), Immediate(FACTORY->empty_fixed_array()));
- call_runtime.Branch(not_equal);
- // Check that instance descriptors are not empty so that we can
- // check for an enum cache. Leave the map in ebx for the subsequent
- // prototype load.
- __ mov(ebx, FieldOperand(ecx, HeapObject::kMapOffset));
- __ mov(edx, FieldOperand(ebx, Map::kInstanceDescriptorsOffset));
- __ cmp(Operand(edx), Immediate(FACTORY->empty_descriptor_array()));
- call_runtime.Branch(equal);
- // Check that there in an enum cache in the non-empty instance
- // descriptors. This is the case if the next enumeration index
- // field does not contain a smi.
- __ mov(edx, FieldOperand(edx, DescriptorArray::kEnumerationIndexOffset));
- __ test(edx, Immediate(kSmiTagMask));
- call_runtime.Branch(zero);
- // For all objects but the receiver, check that the cache is empty.
- __ cmp(ecx, Operand(eax));
- check_prototype.Branch(equal);
- __ mov(edx, FieldOperand(edx, DescriptorArray::kEnumCacheBridgeCacheOffset));
- __ cmp(Operand(edx), Immediate(FACTORY->empty_fixed_array()));
- call_runtime.Branch(not_equal);
- check_prototype.Bind();
- // Load the prototype from the map and loop if non-null.
- __ mov(ecx, FieldOperand(ebx, Map::kPrototypeOffset));
- __ cmp(Operand(ecx), Immediate(FACTORY->null_value()));
- loop.Branch(not_equal);
- // The enum cache is valid. Load the map of the object being
- // iterated over and use the cache for the iteration.
- __ mov(eax, FieldOperand(eax, HeapObject::kMapOffset));
- use_cache.Jump();
-
- call_runtime.Bind();
- // Call the runtime to get the property names for the object.
- frame_->EmitPush(eax); // push the Object (slot 4) for the runtime call
- frame_->CallRuntime(Runtime::kGetPropertyNamesFast, 1);
-
- // If we got a map from the runtime call, we can do a fast
- // modification check. Otherwise, we got a fixed array, and we have
- // to do a slow check.
- // eax: map or fixed array (result from call to
- // Runtime::kGetPropertyNamesFast)
- __ mov(edx, Operand(eax));
- __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
- __ cmp(ecx, FACTORY->meta_map());
- fixed_array.Branch(not_equal);
-
- use_cache.Bind();
- // Get enum cache
- // eax: map (either the result from a call to
- // Runtime::kGetPropertyNamesFast or has been fetched directly from
- // the object)
- __ mov(ecx, Operand(eax));
-
- __ mov(ecx, FieldOperand(ecx, Map::kInstanceDescriptorsOffset));
- // Get the bridge array held in the enumeration index field.
- __ mov(ecx, FieldOperand(ecx, DescriptorArray::kEnumerationIndexOffset));
- // Get the cache from the bridge array.
- __ mov(edx, FieldOperand(ecx, DescriptorArray::kEnumCacheBridgeCacheOffset));
-
- frame_->EmitPush(eax); // <- slot 3
- frame_->EmitPush(edx); // <- slot 2
- __ mov(eax, FieldOperand(edx, FixedArray::kLengthOffset));
- frame_->EmitPush(eax); // <- slot 1
- frame_->EmitPush(Immediate(Smi::FromInt(0))); // <- slot 0
- entry.Jump();
-
- fixed_array.Bind();
- // eax: fixed array (result from call to Runtime::kGetPropertyNamesFast)
- frame_->EmitPush(Immediate(Smi::FromInt(0))); // <- slot 3
- frame_->EmitPush(eax); // <- slot 2
-
- // Push the length of the array and the initial index onto the stack.
- __ mov(eax, FieldOperand(eax, FixedArray::kLengthOffset));
- frame_->EmitPush(eax); // <- slot 1
- frame_->EmitPush(Immediate(Smi::FromInt(0))); // <- slot 0
-
- // Condition.
- entry.Bind();
- // Grab the current frame's height for the break and continue
- // targets only after all the state is pushed on the frame.
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
-
- __ mov(eax, frame_->ElementAt(0)); // load the current count
- __ cmp(eax, frame_->ElementAt(1)); // compare to the array length
- node->break_target()->Branch(above_equal);
-
- // Get the i'th entry of the array.
- __ mov(edx, frame_->ElementAt(2));
- __ mov(ebx, FixedArrayElementOperand(edx, eax));
-
- // Get the expected map from the stack or a zero map in the
- // permanent slow case eax: current iteration count ebx: i'th entry
- // of the enum cache
- __ mov(edx, frame_->ElementAt(3));
- // Check if the expected map still matches that of the enumerable.
- // If not, we have to filter the key.
- // eax: current iteration count
- // ebx: i'th entry of the enum cache
- // edx: expected map value
- __ mov(ecx, frame_->ElementAt(4));
- __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset));
- __ cmp(ecx, Operand(edx));
- end_del_check.Branch(equal);
-
- // Convert the entry to a string (or null if it isn't a property anymore).
- frame_->EmitPush(frame_->ElementAt(4)); // push enumerable
- frame_->EmitPush(ebx); // push entry
- frame_->InvokeBuiltin(Builtins::FILTER_KEY, CALL_FUNCTION, 2);
- __ mov(ebx, Operand(eax));
-
- // If the property has been removed while iterating, we just skip it.
- __ test(ebx, Operand(ebx));
- node->continue_target()->Branch(equal);
-
- end_del_check.Bind();
- // Store the entry in the 'each' expression and take another spin in the
- // loop. edx: i'th entry of the enum cache (or string there of)
- frame_->EmitPush(ebx);
- { Reference each(this, node->each());
- if (!each.is_illegal()) {
- if (each.size() > 0) {
- // Loading a reference may leave the frame in an unspilled state.
- frame_->SpillAll();
- // Get the value (under the reference on the stack) from memory.
- frame_->EmitPush(frame_->ElementAt(each.size()));
- each.SetValue(NOT_CONST_INIT);
- frame_->Drop(2);
- } else {
- // If the reference was to a slot we rely on the convenient property
- // that it doesn't matter whether a value (eg, ebx pushed above) is
- // right on top of or right underneath a zero-sized reference.
- each.SetValue(NOT_CONST_INIT);
- frame_->Drop();
- }
- }
- }
- // Unloading a reference may leave the frame in an unspilled state.
- frame_->SpillAll();
-
- // Body.
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- VisitAndSpill(node->body());
-
- // Next. Reestablish a spilled frame in case we are coming here via
- // a continue in the body.
- node->continue_target()->Bind();
- frame_->SpillAll();
- frame_->EmitPop(eax);
- __ add(Operand(eax), Immediate(Smi::FromInt(1)));
- frame_->EmitPush(eax);
- entry.Jump();
-
- // Cleanup. No need to spill because VirtualFrame::Drop is safe for
- // any frame.
- node->break_target()->Bind();
- frame_->Drop(5);
-
- // Exit.
- exit.Bind();
-
- node->continue_target()->Unuse();
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::VisitTryCatchStatement(TryCatchStatement* node) {
- ASSERT(!in_spilled_code());
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ TryCatchStatement");
- CodeForStatementPosition(node);
-
- JumpTarget try_block;
- JumpTarget exit;
-
- try_block.Call();
- // --- Catch block ---
- frame_->EmitPush(eax);
-
- // Store the caught exception in the catch variable.
- Variable* catch_var = node->catch_var()->var();
- ASSERT(catch_var != NULL && catch_var->AsSlot() != NULL);
- StoreToSlot(catch_var->AsSlot(), NOT_CONST_INIT);
-
- // Remove the exception from the stack.
- frame_->Drop();
-
- VisitStatementsAndSpill(node->catch_block()->statements());
- if (has_valid_frame()) {
- exit.Jump();
- }
-
-
- // --- Try block ---
- try_block.Bind();
-
- frame_->PushTryHandler(TRY_CATCH_HANDLER);
- int handler_height = frame_->height();
-
- // Shadow the jump targets for all escapes from the try block, including
- // returns. During shadowing, the original target is hidden as the
- // ShadowTarget and operations on the original actually affect the
- // shadowing target.
- //
- // We should probably try to unify the escaping targets and the return
- // target.
- int nof_escapes = node->escaping_targets()->length();
- List<ShadowTarget*> shadows(1 + nof_escapes);
-
- // Add the shadow target for the function return.
- static const int kReturnShadowIndex = 0;
- shadows.Add(new ShadowTarget(&function_return_));
- bool function_return_was_shadowed = function_return_is_shadowed_;
- function_return_is_shadowed_ = true;
- ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_);
-
- // Add the remaining shadow targets.
- for (int i = 0; i < nof_escapes; i++) {
- shadows.Add(new ShadowTarget(node->escaping_targets()->at(i)));
- }
-
- // Generate code for the statements in the try block.
- VisitStatementsAndSpill(node->try_block()->statements());
-
- // Stop the introduced shadowing and count the number of required unlinks.
- // After shadowing stops, the original targets are unshadowed and the
- // ShadowTargets represent the formerly shadowing targets.
- bool has_unlinks = false;
- for (int i = 0; i < shadows.length(); i++) {
- shadows[i]->StopShadowing();
- has_unlinks = has_unlinks || shadows[i]->is_linked();
- }
- function_return_is_shadowed_ = function_return_was_shadowed;
-
- // Get an external reference to the handler address.
- ExternalReference handler_address(Isolate::k_handler_address,
- masm()->isolate());
-
- // Make sure that there's nothing left on the stack above the
- // handler structure.
- if (FLAG_debug_code) {
- __ mov(eax, Operand::StaticVariable(handler_address));
- __ cmp(esp, Operand(eax));
- __ Assert(equal, "stack pointer should point to top handler");
- }
-
- // If we can fall off the end of the try block, unlink from try chain.
- if (has_valid_frame()) {
- // The next handler address is on top of the frame. Unlink from
- // the handler list and drop the rest of this handler from the
- // frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(Operand::StaticVariable(handler_address));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
- if (has_unlinks) {
- exit.Jump();
- }
- }
-
- // Generate unlink code for the (formerly) shadowing targets that
- // have been jumped to. Deallocate each shadow target.
- Result return_value;
- for (int i = 0; i < shadows.length(); i++) {
- if (shadows[i]->is_linked()) {
- // Unlink from try chain; be careful not to destroy the TOS if
- // there is one.
- if (i == kReturnShadowIndex) {
- shadows[i]->Bind(&return_value);
- return_value.ToRegister(eax);
- } else {
- shadows[i]->Bind();
- }
- // Because we can be jumping here (to spilled code) from
- // unspilled code, we need to reestablish a spilled frame at
- // this block.
- frame_->SpillAll();
-
- // Reload sp from the top handler, because some statements that we
- // break from (eg, for...in) may have left stuff on the stack.
- __ mov(esp, Operand::StaticVariable(handler_address));
- frame_->Forget(frame_->height() - handler_height);
-
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(Operand::StaticVariable(handler_address));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- if (i == kReturnShadowIndex) {
- if (!function_return_is_shadowed_) frame_->PrepareForReturn();
- shadows[i]->other_target()->Jump(&return_value);
- } else {
- shadows[i]->other_target()->Jump();
- }
- }
- }
-
- exit.Bind();
-}
-
-
-void CodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* node) {
- ASSERT(!in_spilled_code());
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ TryFinallyStatement");
- CodeForStatementPosition(node);
-
- // State: Used to keep track of reason for entering the finally
- // block. Should probably be extended to hold information for
- // break/continue from within the try block.
- enum { FALLING, THROWING, JUMPING };
-
- JumpTarget try_block;
- JumpTarget finally_block;
-
- try_block.Call();
-
- frame_->EmitPush(eax);
- // In case of thrown exceptions, this is where we continue.
- __ Set(ecx, Immediate(Smi::FromInt(THROWING)));
- finally_block.Jump();
-
- // --- Try block ---
- try_block.Bind();
-
- frame_->PushTryHandler(TRY_FINALLY_HANDLER);
- int handler_height = frame_->height();
-
- // Shadow the jump targets for all escapes from the try block, including
- // returns. During shadowing, the original target is hidden as the
- // ShadowTarget and operations on the original actually affect the
- // shadowing target.
- //
- // We should probably try to unify the escaping targets and the return
- // target.
- int nof_escapes = node->escaping_targets()->length();
- List<ShadowTarget*> shadows(1 + nof_escapes);
-
- // Add the shadow target for the function return.
- static const int kReturnShadowIndex = 0;
- shadows.Add(new ShadowTarget(&function_return_));
- bool function_return_was_shadowed = function_return_is_shadowed_;
- function_return_is_shadowed_ = true;
- ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_);
-
- // Add the remaining shadow targets.
- for (int i = 0; i < nof_escapes; i++) {
- shadows.Add(new ShadowTarget(node->escaping_targets()->at(i)));
- }
-
- // Generate code for the statements in the try block.
- VisitStatementsAndSpill(node->try_block()->statements());
-
- // Stop the introduced shadowing and count the number of required unlinks.
- // After shadowing stops, the original targets are unshadowed and the
- // ShadowTargets represent the formerly shadowing targets.
- int nof_unlinks = 0;
- for (int i = 0; i < shadows.length(); i++) {
- shadows[i]->StopShadowing();
- if (shadows[i]->is_linked()) nof_unlinks++;
- }
- function_return_is_shadowed_ = function_return_was_shadowed;
-
- // Get an external reference to the handler address.
- ExternalReference handler_address(Isolate::k_handler_address,
- masm()->isolate());
-
- // If we can fall off the end of the try block, unlink from the try
- // chain and set the state on the frame to FALLING.
- if (has_valid_frame()) {
- // The next handler address is on top of the frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(Operand::StaticVariable(handler_address));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- // Fake a top of stack value (unneeded when FALLING) and set the
- // state in ecx, then jump around the unlink blocks if any.
- frame_->EmitPush(Immediate(FACTORY->undefined_value()));
- __ Set(ecx, Immediate(Smi::FromInt(FALLING)));
- if (nof_unlinks > 0) {
- finally_block.Jump();
- }
- }
-
- // Generate code to unlink and set the state for the (formerly)
- // shadowing targets that have been jumped to.
- for (int i = 0; i < shadows.length(); i++) {
- if (shadows[i]->is_linked()) {
- // If we have come from the shadowed return, the return value is
- // on the virtual frame. We must preserve it until it is
- // pushed.
- if (i == kReturnShadowIndex) {
- Result return_value;
- shadows[i]->Bind(&return_value);
- return_value.ToRegister(eax);
- } else {
- shadows[i]->Bind();
- }
- // Because we can be jumping here (to spilled code) from
- // unspilled code, we need to reestablish a spilled frame at
- // this block.
- frame_->SpillAll();
-
- // Reload sp from the top handler, because some statements that
- // we break from (eg, for...in) may have left stuff on the
- // stack.
- __ mov(esp, Operand::StaticVariable(handler_address));
- frame_->Forget(frame_->height() - handler_height);
-
- // Unlink this handler and drop it from the frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- frame_->EmitPop(Operand::StaticVariable(handler_address));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- if (i == kReturnShadowIndex) {
- // If this target shadowed the function return, materialize
- // the return value on the stack.
- frame_->EmitPush(eax);
- } else {
- // Fake TOS for targets that shadowed breaks and continues.
- frame_->EmitPush(Immediate(FACTORY->undefined_value()));
- }
- __ Set(ecx, Immediate(Smi::FromInt(JUMPING + i)));
- if (--nof_unlinks > 0) {
- // If this is not the last unlink block, jump around the next.
- finally_block.Jump();
- }
- }
- }
-
- // --- Finally block ---
- finally_block.Bind();
-
- // Push the state on the stack.
- frame_->EmitPush(ecx);
-
- // We keep two elements on the stack - the (possibly faked) result
- // and the state - while evaluating the finally block.
- //
- // Generate code for the statements in the finally block.
- VisitStatementsAndSpill(node->finally_block()->statements());
-
- if (has_valid_frame()) {
- // Restore state and return value or faked TOS.
- frame_->EmitPop(ecx);
- frame_->EmitPop(eax);
- }
-
- // Generate code to jump to the right destination for all used
- // formerly shadowing targets. Deallocate each shadow target.
- for (int i = 0; i < shadows.length(); i++) {
- if (has_valid_frame() && shadows[i]->is_bound()) {
- BreakTarget* original = shadows[i]->other_target();
- __ cmp(Operand(ecx), Immediate(Smi::FromInt(JUMPING + i)));
- if (i == kReturnShadowIndex) {
- // The return value is (already) in eax.
- Result return_value = allocator_->Allocate(eax);
- ASSERT(return_value.is_valid());
- if (function_return_is_shadowed_) {
- original->Branch(equal, &return_value);
- } else {
- // Branch around the preparation for return which may emit
- // code.
- JumpTarget skip;
- skip.Branch(not_equal);
- frame_->PrepareForReturn();
- original->Jump(&return_value);
- skip.Bind();
- }
- } else {
- original->Branch(equal);
- }
- }
- }
-
- if (has_valid_frame()) {
- // Check if we need to rethrow the exception.
- JumpTarget exit;
- __ cmp(Operand(ecx), Immediate(Smi::FromInt(THROWING)));
- exit.Branch(not_equal);
-
- // Rethrow exception.
- frame_->EmitPush(eax); // undo pop from above
- frame_->CallRuntime(Runtime::kReThrow, 1);
-
- // Done.
- exit.Bind();
- }
-}
-
-
-void CodeGenerator::VisitDebuggerStatement(DebuggerStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ DebuggerStatement");
- CodeForStatementPosition(node);
-#ifdef ENABLE_DEBUGGER_SUPPORT
- // Spill everything, even constants, to the frame.
- frame_->SpillAll();
-
- frame_->DebugBreak();
- // Ignore the return value.
-#endif
-}
-
-
-Result CodeGenerator::InstantiateFunction(
- Handle<SharedFunctionInfo> function_info,
- bool pretenure) {
- // The inevitable call will sync frame elements to memory anyway, so
- // we do it eagerly to allow us to push the arguments directly into
- // place.
- frame()->SyncRange(0, frame()->element_count() - 1);
-
- // Use the fast case closure allocation code that allocates in new
- // space for nested functions that don't need literals cloning.
- if (!pretenure &&
- scope()->is_function_scope() &&
- function_info->num_literals() == 0) {
- FastNewClosureStub stub(
- function_info->strict_mode() ? kStrictMode : kNonStrictMode);
- frame()->EmitPush(Immediate(function_info));
- return frame()->CallStub(&stub, 1);
- } else {
- // Call the runtime to instantiate the function based on the
- // shared function info.
- frame()->EmitPush(esi);
- frame()->EmitPush(Immediate(function_info));
- frame()->EmitPush(Immediate(pretenure
- ? FACTORY->true_value()
- : FACTORY->false_value()));
- return frame()->CallRuntime(Runtime::kNewClosure, 3);
- }
-}
-
-
-void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) {
- Comment cmnt(masm_, "[ FunctionLiteral");
- ASSERT(!in_safe_int32_mode());
- // Build the function info and instantiate it.
- Handle<SharedFunctionInfo> function_info =
- Compiler::BuildFunctionInfo(node, script());
- // Check for stack-overflow exception.
- if (function_info.is_null()) {
- SetStackOverflow();
- return;
- }
- Result result = InstantiateFunction(function_info, node->pretenure());
- frame()->Push(&result);
-}
-
-
-void CodeGenerator::VisitSharedFunctionInfoLiteral(
- SharedFunctionInfoLiteral* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ SharedFunctionInfoLiteral");
- Result result = InstantiateFunction(node->shared_function_info(), false);
- frame()->Push(&result);
-}
-
-
-void CodeGenerator::VisitConditional(Conditional* node) {
- Comment cmnt(masm_, "[ Conditional");
- ASSERT(!in_safe_int32_mode());
- JumpTarget then;
- JumpTarget else_;
- JumpTarget exit;
- ControlDestination dest(&then, &else_, true);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // The else target was bound, so we compile the else part first.
- Load(node->else_expression());
-
- if (then.is_linked()) {
- exit.Jump();
- then.Bind();
- Load(node->then_expression());
- }
- } else {
- // The then target was bound, so we compile the then part first.
- Load(node->then_expression());
-
- if (else_.is_linked()) {
- exit.Jump();
- else_.Bind();
- Load(node->else_expression());
- }
- }
-
- exit.Bind();
-}
-
-
-void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
- if (slot->type() == Slot::LOOKUP) {
- ASSERT(slot->var()->is_dynamic());
- JumpTarget slow;
- JumpTarget done;
- Result value;
-
- // Generate fast case for loading from slots that correspond to
- // local/global variables or arguments unless they are shadowed by
- // eval-introduced bindings.
- EmitDynamicLoadFromSlotFastCase(slot,
- typeof_state,
- &value,
- &slow,
- &done);
-
- slow.Bind();
- // A runtime call is inevitable. We eagerly sync frame elements
- // to memory so that we can push the arguments directly into place
- // on top of the frame.
- frame()->SyncRange(0, frame()->element_count() - 1);
- frame()->EmitPush(esi);
- frame()->EmitPush(Immediate(slot->var()->name()));
- if (typeof_state == INSIDE_TYPEOF) {
- value =
- frame()->CallRuntime(Runtime::kLoadContextSlotNoReferenceError, 2);
- } else {
- value = frame()->CallRuntime(Runtime::kLoadContextSlot, 2);
- }
-
- done.Bind(&value);
- frame_->Push(&value);
-
- } else if (slot->var()->mode() == Variable::CONST) {
- // Const slots may contain 'the hole' value (the constant hasn't been
- // initialized yet) which needs to be converted into the 'undefined'
- // value.
- //
- // We currently spill the virtual frame because constants use the
- // potentially unsafe direct-frame access of SlotOperand.
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ Load const");
- Label exit;
- __ mov(ecx, SlotOperand(slot, ecx));
- __ cmp(ecx, FACTORY->the_hole_value());
- __ j(not_equal, &exit);
- __ mov(ecx, FACTORY->undefined_value());
- __ bind(&exit);
- frame()->EmitPush(ecx);
-
- } else if (slot->type() == Slot::PARAMETER) {
- frame()->PushParameterAt(slot->index());
-
- } else if (slot->type() == Slot::LOCAL) {
- frame()->PushLocalAt(slot->index());
-
- } else {
- // The other remaining slot types (LOOKUP and GLOBAL) cannot reach
- // here.
- //
- // The use of SlotOperand below is safe for an unspilled frame
- // because it will always be a context slot.
- ASSERT(slot->type() == Slot::CONTEXT);
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), SlotOperand(slot, temp.reg()));
- frame()->Push(&temp);
- }
-}
-
-
-void CodeGenerator::LoadFromSlotCheckForArguments(Slot* slot,
- TypeofState state) {
- LoadFromSlot(slot, state);
-
- // Bail out quickly if we're not using lazy arguments allocation.
- if (ArgumentsMode() != LAZY_ARGUMENTS_ALLOCATION) return;
-
- // ... or if the slot isn't a non-parameter arguments slot.
- if (slot->type() == Slot::PARAMETER || !slot->is_arguments()) return;
-
- // If the loaded value is a constant, we know if the arguments
- // object has been lazily loaded yet.
- Result result = frame()->Pop();
- if (result.is_constant()) {
- if (result.handle()->IsArgumentsMarker()) {
- result = StoreArgumentsObject(false);
- }
- frame()->Push(&result);
- return;
- }
- ASSERT(result.is_register());
- // The loaded value is in a register. If it is the sentinel that
- // indicates that we haven't loaded the arguments object yet, we
- // need to do it now.
- JumpTarget exit;
- __ cmp(Operand(result.reg()), Immediate(FACTORY->arguments_marker()));
- frame()->Push(&result);
- exit.Branch(not_equal);
-
- result = StoreArgumentsObject(false);
- frame()->SetElementAt(0, &result);
- result.Unuse();
- exit.Bind();
- return;
-}
-
-
-Result CodeGenerator::LoadFromGlobalSlotCheckExtensions(
- Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow) {
- ASSERT(!in_safe_int32_mode());
- // Check that no extension objects have been created by calls to
- // eval from the current scope to the global scope.
- Register context = esi;
- Result tmp = allocator_->Allocate();
- ASSERT(tmp.is_valid()); // All non-reserved registers were available.
-
- Scope* s = scope();
- while (s != NULL) {
- if (s->num_heap_slots() > 0) {
- if (s->calls_eval()) {
- // Check that extension is NULL.
- __ cmp(ContextOperand(context, Context::EXTENSION_INDEX),
- Immediate(0));
- slow->Branch(not_equal, not_taken);
- }
- // Load next context in chain.
- __ mov(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX));
- __ mov(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
- context = tmp.reg();
- }
- // If no outer scope calls eval, we do not need to check more
- // context extensions. If we have reached an eval scope, we check
- // all extensions from this point.
- if (!s->outer_scope_calls_eval() || s->is_eval_scope()) break;
- s = s->outer_scope();
- }
-
- if (s != NULL && s->is_eval_scope()) {
- // Loop up the context chain. There is no frame effect so it is
- // safe to use raw labels here.
- Label next, fast;
- if (!context.is(tmp.reg())) {
- __ mov(tmp.reg(), context);
- }
- __ bind(&next);
- // Terminate at global context.
- __ cmp(FieldOperand(tmp.reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->global_context_map()));
- __ j(equal, &fast);
- // Check that extension is NULL.
- __ cmp(ContextOperand(tmp.reg(), Context::EXTENSION_INDEX), Immediate(0));
- slow->Branch(not_equal, not_taken);
- // Load next context in chain.
- __ mov(tmp.reg(), ContextOperand(tmp.reg(), Context::CLOSURE_INDEX));
- __ mov(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
- __ jmp(&next);
- __ bind(&fast);
- }
- tmp.Unuse();
-
- // All extension objects were empty and it is safe to use a global
- // load IC call.
- // The register allocator prefers eax if it is free, so the code generator
- // will load the global object directly into eax, which is where the LoadIC
- // expects it.
- frame_->Spill(eax);
- LoadGlobal();
- frame_->Push(slot->var()->name());
- RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
- ? RelocInfo::CODE_TARGET
- : RelocInfo::CODE_TARGET_CONTEXT;
- Result answer = frame_->CallLoadIC(mode);
- // A test eax instruction following the call signals that the inobject
- // property case was inlined. Ensure that there is not a test eax
- // instruction here.
- __ nop();
- return answer;
-}
-
-
-void CodeGenerator::EmitDynamicLoadFromSlotFastCase(Slot* slot,
- TypeofState typeof_state,
- Result* result,
- JumpTarget* slow,
- JumpTarget* done) {
- // Generate fast-case code for variables that might be shadowed by
- // eval-introduced variables. Eval is used a lot without
- // introducing variables. In those cases, we do not want to
- // perform a runtime call for all variables in the scope
- // containing the eval.
- if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
- *result = LoadFromGlobalSlotCheckExtensions(slot, typeof_state, slow);
- done->Jump(result);
-
- } else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
- Slot* potential_slot = slot->var()->local_if_not_shadowed()->AsSlot();
- Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
- if (potential_slot != NULL) {
- // Generate fast case for locals that rewrite to slots.
- // Allocate a fresh register to use as a temp in
- // ContextSlotOperandCheckExtensions and to hold the result
- // value.
- *result = allocator()->Allocate();
- ASSERT(result->is_valid());
- __ mov(result->reg(),
- ContextSlotOperandCheckExtensions(potential_slot, *result, slow));
- if (potential_slot->var()->mode() == Variable::CONST) {
- __ cmp(result->reg(), FACTORY->the_hole_value());
- done->Branch(not_equal, result);
- __ mov(result->reg(), FACTORY->undefined_value());
- }
- done->Jump(result);
- } else if (rewrite != NULL) {
- // Generate fast case for calls of an argument function.
- Property* property = rewrite->AsProperty();
- if (property != NULL) {
- VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
- Literal* key_literal = property->key()->AsLiteral();
- if (obj_proxy != NULL &&
- key_literal != NULL &&
- obj_proxy->IsArguments() &&
- key_literal->handle()->IsSmi()) {
- // Load arguments object if there are no eval-introduced
- // variables. Then load the argument from the arguments
- // object using keyed load.
- Result arguments = allocator()->Allocate();
- ASSERT(arguments.is_valid());
- __ mov(arguments.reg(),
- ContextSlotOperandCheckExtensions(obj_proxy->var()->AsSlot(),
- arguments,
- slow));
- frame_->Push(&arguments);
- frame_->Push(key_literal->handle());
- *result = EmitKeyedLoad();
- done->Jump(result);
- }
- }
- }
- }
-}
-
-
-void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) {
- if (slot->type() == Slot::LOOKUP) {
- ASSERT(slot->var()->is_dynamic());
-
- // For now, just do a runtime call. Since the call is inevitable,
- // we eagerly sync the virtual frame so we can directly push the
- // arguments into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
-
- frame_->EmitPush(esi);
- frame_->EmitPush(Immediate(slot->var()->name()));
-
- Result value;
- if (init_state == CONST_INIT) {
- // Same as the case for a normal store, but ignores attribute
- // (e.g. READ_ONLY) of context slot so that we can initialize const
- // properties (introduced via eval("const foo = (some expr);")). Also,
- // uses the current function context instead of the top context.
- //
- // Note that we must declare the foo upon entry of eval(), via a
- // context slot declaration, but we cannot initialize it at the same
- // time, because the const declaration may be at the end of the eval
- // code (sigh...) and the const variable may have been used before
- // (where its value is 'undefined'). Thus, we can only do the
- // initialization when we actually encounter the expression and when
- // the expression operands are defined and valid, and thus we need the
- // split into 2 operations: declaration of the context slot followed
- // by initialization.
- value = frame_->CallRuntime(Runtime::kInitializeConstContextSlot, 3);
- } else {
- frame_->Push(Smi::FromInt(strict_mode_flag()));
- value = frame_->CallRuntime(Runtime::kStoreContextSlot, 4);
- }
- // Storing a variable must keep the (new) value on the expression
- // stack. This is necessary for compiling chained assignment
- // expressions.
- frame_->Push(&value);
-
- } else {
- ASSERT(!slot->var()->is_dynamic());
-
- JumpTarget exit;
- if (init_state == CONST_INIT) {
- ASSERT(slot->var()->mode() == Variable::CONST);
- // Only the first const initialization must be executed (the slot
- // still contains 'the hole' value). When the assignment is executed,
- // the code is identical to a normal store (see below).
- //
- // We spill the frame in the code below because the direct-frame
- // access of SlotOperand is potentially unsafe with an unspilled
- // frame.
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ Init const");
- __ mov(ecx, SlotOperand(slot, ecx));
- __ cmp(ecx, FACTORY->the_hole_value());
- exit.Branch(not_equal);
- }
-
- // We must execute the store. Storing a variable must keep the (new)
- // value on the stack. This is necessary for compiling assignment
- // expressions.
- //
- // Note: We will reach here even with slot->var()->mode() ==
- // Variable::CONST because of const declarations which will initialize
- // consts to 'the hole' value and by doing so, end up calling this code.
- if (slot->type() == Slot::PARAMETER) {
- frame_->StoreToParameterAt(slot->index());
- } else if (slot->type() == Slot::LOCAL) {
- frame_->StoreToLocalAt(slot->index());
- } else {
- // The other slot types (LOOKUP and GLOBAL) cannot reach here.
- //
- // The use of SlotOperand below is safe for an unspilled frame
- // because the slot is a context slot.
- ASSERT(slot->type() == Slot::CONTEXT);
- frame_->Dup();
- Result value = frame_->Pop();
- value.ToRegister();
- Result start = allocator_->Allocate();
- ASSERT(start.is_valid());
- __ mov(SlotOperand(slot, start.reg()), value.reg());
- // RecordWrite may destroy the value registers.
- //
- // TODO(204): Avoid actually spilling when the value is not
- // needed (probably the common case).
- frame_->Spill(value.reg());
- int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- __ RecordWrite(start.reg(), offset, value.reg(), temp.reg());
- // The results start, value, and temp are unused by going out of
- // scope.
- }
-
- exit.Bind();
- }
-}
-
-
-void CodeGenerator::VisitSlot(Slot* slot) {
- Comment cmnt(masm_, "[ Slot");
- if (in_safe_int32_mode()) {
- if ((slot->type() == Slot::LOCAL && !slot->is_arguments())) {
- frame()->UntaggedPushLocalAt(slot->index());
- } else if (slot->type() == Slot::PARAMETER) {
- frame()->UntaggedPushParameterAt(slot->index());
- } else {
- UNREACHABLE();
- }
- } else {
- LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
- }
-}
-
-
-void CodeGenerator::VisitVariableProxy(VariableProxy* node) {
- Comment cmnt(masm_, "[ VariableProxy");
- Variable* var = node->var();
- Expression* expr = var->rewrite();
- if (expr != NULL) {
- Visit(expr);
- } else {
- ASSERT(var->is_global());
- ASSERT(!in_safe_int32_mode());
- Reference ref(this, node);
- ref.GetValue();
- }
-}
-
-
-void CodeGenerator::VisitLiteral(Literal* node) {
- Comment cmnt(masm_, "[ Literal");
- if (frame_->ConstantPoolOverflowed()) {
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- if (in_safe_int32_mode()) {
- temp.set_untagged_int32(true);
- }
- __ Set(temp.reg(), Immediate(node->handle()));
- frame_->Push(&temp);
- } else {
- if (in_safe_int32_mode()) {
- frame_->PushUntaggedElement(node->handle());
- } else {
- frame_->Push(node->handle());
- }
- }
-}
-
-
-void CodeGenerator::PushUnsafeSmi(Handle<Object> value) {
- ASSERT(value->IsSmi());
- int bits = reinterpret_cast<int>(*value);
- __ push(Immediate(bits ^ jit_cookie_));
- __ xor_(Operand(esp, 0), Immediate(jit_cookie_));
-}
-
-
-void CodeGenerator::StoreUnsafeSmiToLocal(int offset, Handle<Object> value) {
- ASSERT(value->IsSmi());
- int bits = reinterpret_cast<int>(*value);
- __ mov(Operand(ebp, offset), Immediate(bits ^ jit_cookie_));
- __ xor_(Operand(ebp, offset), Immediate(jit_cookie_));
-}
-
-
-void CodeGenerator::MoveUnsafeSmi(Register target, Handle<Object> value) {
- ASSERT(target.is_valid());
- ASSERT(value->IsSmi());
- int bits = reinterpret_cast<int>(*value);
- __ Set(target, Immediate(bits ^ jit_cookie_));
- __ xor_(target, jit_cookie_);
-}
-
-
-bool CodeGenerator::IsUnsafeSmi(Handle<Object> value) {
- if (!value->IsSmi()) return false;
- int int_value = Smi::cast(*value)->value();
- return !is_intn(int_value, kMaxSmiInlinedBits);
-}
-
-
-// Materialize the regexp literal 'node' in the literals array
-// 'literals' of the function. Leave the regexp boilerplate in
-// 'boilerplate'.
-class DeferredRegExpLiteral: public DeferredCode {
- public:
- DeferredRegExpLiteral(Register boilerplate,
- Register literals,
- RegExpLiteral* node)
- : boilerplate_(boilerplate), literals_(literals), node_(node) {
- set_comment("[ DeferredRegExpLiteral");
- }
-
- void Generate();
-
- private:
- Register boilerplate_;
- Register literals_;
- RegExpLiteral* node_;
-};
-
-
-void DeferredRegExpLiteral::Generate() {
- // Since the entry is undefined we call the runtime system to
- // compute the literal.
- // Literal array (0).
- __ push(literals_);
- // Literal index (1).
- __ push(Immediate(Smi::FromInt(node_->literal_index())));
- // RegExp pattern (2).
- __ push(Immediate(node_->pattern()));
- // RegExp flags (3).
- __ push(Immediate(node_->flags()));
- __ CallRuntime(Runtime::kMaterializeRegExpLiteral, 4);
- if (!boilerplate_.is(eax)) __ mov(boilerplate_, eax);
-}
-
-
-class DeferredAllocateInNewSpace: public DeferredCode {
- public:
- DeferredAllocateInNewSpace(int size,
- Register target,
- int registers_to_save = 0)
- : size_(size), target_(target), registers_to_save_(registers_to_save) {
- ASSERT(size >= kPointerSize && size <= HEAP->MaxObjectSizeInNewSpace());
- ASSERT_EQ(0, registers_to_save & target.bit());
- set_comment("[ DeferredAllocateInNewSpace");
- }
- void Generate();
-
- private:
- int size_;
- Register target_;
- int registers_to_save_;
-};
-
-
-void DeferredAllocateInNewSpace::Generate() {
- for (int i = 0; i < kNumRegs; i++) {
- if (registers_to_save_ & (1 << i)) {
- Register save_register = { i };
- __ push(save_register);
- }
- }
- __ push(Immediate(Smi::FromInt(size_)));
- __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
- if (!target_.is(eax)) {
- __ mov(target_, eax);
- }
- for (int i = kNumRegs - 1; i >= 0; i--) {
- if (registers_to_save_ & (1 << i)) {
- Register save_register = { i };
- __ pop(save_register);
- }
- }
-}
-
-
-void CodeGenerator::VisitRegExpLiteral(RegExpLiteral* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ RegExp Literal");
-
- // Retrieve the literals array and check the allocated entry. Begin
- // with a writable copy of the function of this activation in a
- // register.
- frame_->PushFunction();
- Result literals = frame_->Pop();
- literals.ToRegister();
- frame_->Spill(literals.reg());
-
- // Load the literals array of the function.
- __ mov(literals.reg(),
- FieldOperand(literals.reg(), JSFunction::kLiteralsOffset));
-
- // Load the literal at the ast saved index.
- Result boilerplate = allocator_->Allocate();
- ASSERT(boilerplate.is_valid());
- int literal_offset =
- FixedArray::kHeaderSize + node->literal_index() * kPointerSize;
- __ mov(boilerplate.reg(), FieldOperand(literals.reg(), literal_offset));
-
- // Check whether we need to materialize the RegExp object. If so,
- // jump to the deferred code passing the literals array.
- DeferredRegExpLiteral* deferred =
- new DeferredRegExpLiteral(boilerplate.reg(), literals.reg(), node);
- __ cmp(boilerplate.reg(), FACTORY->undefined_value());
- deferred->Branch(equal);
- deferred->BindExit();
-
- // Register of boilerplate contains RegExp object.
-
- Result tmp = allocator()->Allocate();
- ASSERT(tmp.is_valid());
-
- int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
-
- DeferredAllocateInNewSpace* allocate_fallback =
- new DeferredAllocateInNewSpace(size, literals.reg());
- frame_->Push(&boilerplate);
- frame_->SpillTop();
- __ AllocateInNewSpace(size,
- literals.reg(),
- tmp.reg(),
- no_reg,
- allocate_fallback->entry_label(),
- TAG_OBJECT);
- allocate_fallback->BindExit();
- boilerplate = frame_->Pop();
- // Copy from boilerplate to clone and return clone.
-
- for (int i = 0; i < size; i += kPointerSize) {
- __ mov(tmp.reg(), FieldOperand(boilerplate.reg(), i));
- __ mov(FieldOperand(literals.reg(), i), tmp.reg());
- }
- frame_->Push(&literals);
-}
-
-
-void CodeGenerator::VisitObjectLiteral(ObjectLiteral* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ ObjectLiteral");
-
- // Load a writable copy of the function of this activation in a
- // register.
- frame_->PushFunction();
- Result literals = frame_->Pop();
- literals.ToRegister();
- frame_->Spill(literals.reg());
-
- // Load the literals array of the function.
- __ mov(literals.reg(),
- FieldOperand(literals.reg(), JSFunction::kLiteralsOffset));
- // Literal array.
- frame_->Push(&literals);
- // Literal index.
- frame_->Push(Smi::FromInt(node->literal_index()));
- // Constant properties.
- frame_->Push(node->constant_properties());
- // Should the object literal have fast elements?
- frame_->Push(Smi::FromInt(node->fast_elements() ? 1 : 0));
- Result clone;
- if (node->depth() > 1) {
- clone = frame_->CallRuntime(Runtime::kCreateObjectLiteral, 4);
- } else {
- clone = frame_->CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
- }
- frame_->Push(&clone);
-
- // Mark all computed expressions that are bound to a key that
- // is shadowed by a later occurrence of the same key. For the
- // marked expressions, no store code is emitted.
- node->CalculateEmitStore();
-
- for (int i = 0; i < node->properties()->length(); i++) {
- ObjectLiteral::Property* property = node->properties()->at(i);
- switch (property->kind()) {
- case ObjectLiteral::Property::CONSTANT:
- break;
- case ObjectLiteral::Property::MATERIALIZED_LITERAL:
- if (CompileTimeValue::IsCompileTimeValue(property->value())) break;
- // else fall through.
- case ObjectLiteral::Property::COMPUTED: {
- Handle<Object> key(property->key()->handle());
- if (key->IsSymbol()) {
- // Duplicate the object as the IC receiver.
- frame_->Dup();
- Load(property->value());
- if (property->emit_store()) {
- Result ignored =
- frame_->CallStoreIC(Handle<String>::cast(key), false,
- strict_mode_flag());
- // A test eax instruction following the store IC call would
- // indicate the presence of an inlined version of the
- // store. Add a nop to indicate that there is no such
- // inlined version.
- __ nop();
- } else {
- frame_->Drop(2);
- }
- break;
- }
- // Fall through
- }
- case ObjectLiteral::Property::PROTOTYPE: {
- // Duplicate the object as an argument to the runtime call.
- frame_->Dup();
- Load(property->key());
- Load(property->value());
- if (property->emit_store()) {
- frame_->Push(Smi::FromInt(NONE)); // PropertyAttributes
- // Ignore the result.
- Result ignored = frame_->CallRuntime(Runtime::kSetProperty, 4);
- } else {
- frame_->Drop(3);
- }
- break;
- }
- case ObjectLiteral::Property::SETTER: {
- // Duplicate the object as an argument to the runtime call.
- frame_->Dup();
- Load(property->key());
- frame_->Push(Smi::FromInt(1));
- Load(property->value());
- Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4);
- // Ignore the result.
- break;
- }
- case ObjectLiteral::Property::GETTER: {
- // Duplicate the object as an argument to the runtime call.
- frame_->Dup();
- Load(property->key());
- frame_->Push(Smi::FromInt(0));
- Load(property->value());
- Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4);
- // Ignore the result.
- break;
- }
- default: UNREACHABLE();
- }
- }
-}
-
-
-void CodeGenerator::VisitArrayLiteral(ArrayLiteral* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ ArrayLiteral");
-
- // Load a writable copy of the function of this activation in a
- // register.
- frame_->PushFunction();
- Result literals = frame_->Pop();
- literals.ToRegister();
- frame_->Spill(literals.reg());
-
- // Load the literals array of the function.
- __ mov(literals.reg(),
- FieldOperand(literals.reg(), JSFunction::kLiteralsOffset));
-
- frame_->Push(&literals);
- frame_->Push(Smi::FromInt(node->literal_index()));
- frame_->Push(node->constant_elements());
- int length = node->values()->length();
- Result clone;
- if (node->constant_elements()->map() == HEAP->fixed_cow_array_map()) {
- FastCloneShallowArrayStub stub(
- FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS, length);
- clone = frame_->CallStub(&stub, 3);
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->cow_arrays_created_stub(), 1);
- } else if (node->depth() > 1) {
- clone = frame_->CallRuntime(Runtime::kCreateArrayLiteral, 3);
- } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
- clone = frame_->CallRuntime(Runtime::kCreateArrayLiteralShallow, 3);
- } else {
- FastCloneShallowArrayStub stub(
- FastCloneShallowArrayStub::CLONE_ELEMENTS, length);
- clone = frame_->CallStub(&stub, 3);
- }
- frame_->Push(&clone);
-
- // Generate code to set the elements in the array that are not
- // literals.
- for (int i = 0; i < length; i++) {
- Expression* value = node->values()->at(i);
-
- if (!CompileTimeValue::ArrayLiteralElementNeedsInitialization(value)) {
- continue;
- }
-
- // The property must be set by generated code.
- Load(value);
-
- // Get the property value off the stack.
- Result prop_value = frame_->Pop();
- prop_value.ToRegister();
-
- // Fetch the array literal while leaving a copy on the stack and
- // use it to get the elements array.
- frame_->Dup();
- Result elements = frame_->Pop();
- elements.ToRegister();
- frame_->Spill(elements.reg());
- // Get the elements array.
- __ mov(elements.reg(),
- FieldOperand(elements.reg(), JSObject::kElementsOffset));
-
- // Write to the indexed properties array.
- int offset = i * kPointerSize + FixedArray::kHeaderSize;
- __ mov(FieldOperand(elements.reg(), offset), prop_value.reg());
-
- // Update the write barrier for the array address.
- frame_->Spill(prop_value.reg()); // Overwritten by the write barrier.
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_valid());
- __ RecordWrite(elements.reg(), offset, prop_value.reg(), scratch.reg());
- }
-}
-
-
-void CodeGenerator::VisitCatchExtensionObject(CatchExtensionObject* node) {
- ASSERT(!in_safe_int32_mode());
- ASSERT(!in_spilled_code());
- // Call runtime routine to allocate the catch extension object and
- // assign the exception value to the catch variable.
- Comment cmnt(masm_, "[ CatchExtensionObject");
- Load(node->key());
- Load(node->value());
- Result result =
- frame_->CallRuntime(Runtime::kCreateCatchExtensionObject, 2);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::EmitSlotAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Comment cmnt(masm(), "[ Variable Assignment");
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- ASSERT(var != NULL);
- Slot* slot = var->AsSlot();
- ASSERT(slot != NULL);
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
- Load(node->value());
-
- // Perform the binary operation.
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- // Construct the implicit binary operation.
- BinaryOperation expr(node);
- GenericBinaryOperation(&expr,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Perform the assignment.
- if (var->mode() != Variable::CONST || node->op() == Token::INIT_CONST) {
- CodeForSourcePosition(node->position());
- StoreToSlot(slot,
- node->op() == Token::INIT_CONST ? CONST_INIT : NOT_CONST_INIT);
- }
- ASSERT(frame()->height() == original_height + 1);
-}
-
-
-void CodeGenerator::EmitNamedPropertyAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Comment cmnt(masm(), "[ Named Property Assignment");
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- Property* prop = node->target()->AsProperty();
- ASSERT(var == NULL || (prop == NULL && var->is_global()));
-
- // Initialize name and evaluate the receiver sub-expression if necessary. If
- // the receiver is trivial it is not placed on the stack at this point, but
- // loaded whenever actually needed.
- Handle<String> name;
- bool is_trivial_receiver = false;
- if (var != NULL) {
- name = var->name();
- } else {
- Literal* lit = prop->key()->AsLiteral();
- ASSERT_NOT_NULL(lit);
- name = Handle<String>::cast(lit->handle());
- // Do not materialize the receiver on the frame if it is trivial.
- is_trivial_receiver = prop->obj()->IsTrivial();
- if (!is_trivial_receiver) Load(prop->obj());
- }
-
- // Change to slow case in the beginning of an initialization block to
- // avoid the quadratic behavior of repeatedly adding fast properties.
- if (node->starts_initialization_block()) {
- // Initialization block consists of assignments of the form expr.x = ..., so
- // this will never be an assignment to a variable, so there must be a
- // receiver object.
- ASSERT_EQ(NULL, var);
- if (is_trivial_receiver) {
- frame()->Push(prop->obj());
- } else {
- frame()->Dup();
- }
- Result ignored = frame()->CallRuntime(Runtime::kToSlowProperties, 1);
- }
-
- // Change to fast case at the end of an initialization block. To prepare for
- // that add an extra copy of the receiver to the frame, so that it can be
- // converted back to fast case after the assignment.
- if (node->ends_initialization_block() && !is_trivial_receiver) {
- frame()->Dup();
- }
-
- // Stack layout:
- // [tos] : receiver (only materialized if non-trivial)
- // [tos+1] : receiver if at the end of an initialization block
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- if (is_trivial_receiver) {
- frame()->Push(prop->obj());
- } else if (var != NULL) {
- // The LoadIC stub expects the object in eax.
- // Freeing eax causes the code generator to load the global into it.
- frame_->Spill(eax);
- LoadGlobal();
- } else {
- frame()->Dup();
- }
- Result value = EmitNamedLoad(name, var != NULL);
- frame()->Push(&value);
- Load(node->value());
-
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- // Construct the implicit binary operation.
- BinaryOperation expr(node);
- GenericBinaryOperation(&expr,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Stack layout:
- // [tos] : value
- // [tos+1] : receiver (only materialized if non-trivial)
- // [tos+2] : receiver if at the end of an initialization block
-
- // Perform the assignment. It is safe to ignore constants here.
- ASSERT(var == NULL || var->mode() != Variable::CONST);
- ASSERT_NE(Token::INIT_CONST, node->op());
- if (is_trivial_receiver) {
- Result value = frame()->Pop();
- frame()->Push(prop->obj());
- frame()->Push(&value);
- }
- CodeForSourcePosition(node->position());
- bool is_contextual = (var != NULL);
- Result answer = EmitNamedStore(name, is_contextual);
- frame()->Push(&answer);
-
- // Stack layout:
- // [tos] : result
- // [tos+1] : receiver if at the end of an initialization block
-
- if (node->ends_initialization_block()) {
- ASSERT_EQ(NULL, var);
- // The argument to the runtime call is the receiver.
- if (is_trivial_receiver) {
- frame()->Push(prop->obj());
- } else {
- // A copy of the receiver is below the value of the assignment. Swap
- // the receiver and the value of the assignment expression.
- Result result = frame()->Pop();
- Result receiver = frame()->Pop();
- frame()->Push(&result);
- frame()->Push(&receiver);
- }
- Result ignored = frame_->CallRuntime(Runtime::kToFastProperties, 1);
- }
-
- // Stack layout:
- // [tos] : result
-
- ASSERT_EQ(frame()->height(), original_height + 1);
-}
-
-
-void CodeGenerator::EmitKeyedPropertyAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Comment cmnt(masm_, "[ Keyed Property Assignment");
- Property* prop = node->target()->AsProperty();
- ASSERT_NOT_NULL(prop);
-
- // Evaluate the receiver subexpression.
- Load(prop->obj());
-
- // Change to slow case in the beginning of an initialization block to
- // avoid the quadratic behavior of repeatedly adding fast properties.
- if (node->starts_initialization_block()) {
- frame_->Dup();
- Result ignored = frame_->CallRuntime(Runtime::kToSlowProperties, 1);
- }
-
- // Change to fast case at the end of an initialization block. To prepare for
- // that add an extra copy of the receiver to the frame, so that it can be
- // converted back to fast case after the assignment.
- if (node->ends_initialization_block()) {
- frame_->Dup();
- }
-
- // Evaluate the key subexpression.
- Load(prop->key());
-
- // Stack layout:
- // [tos] : key
- // [tos+1] : receiver
- // [tos+2] : receiver if at the end of an initialization block
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- // Duplicate receiver and key for loading the current property value.
- frame()->PushElementAt(1);
- frame()->PushElementAt(1);
- Result value = EmitKeyedLoad();
- frame()->Push(&value);
- Load(node->value());
-
- // Perform the binary operation.
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- BinaryOperation expr(node);
- GenericBinaryOperation(&expr,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Stack layout:
- // [tos] : value
- // [tos+1] : key
- // [tos+2] : receiver
- // [tos+3] : receiver if at the end of an initialization block
-
- // Perform the assignment. It is safe to ignore constants here.
- ASSERT(node->op() != Token::INIT_CONST);
- CodeForSourcePosition(node->position());
- Result answer = EmitKeyedStore(prop->key()->type());
- frame()->Push(&answer);
-
- // Stack layout:
- // [tos] : result
- // [tos+1] : receiver if at the end of an initialization block
-
- // Change to fast case at the end of an initialization block.
- if (node->ends_initialization_block()) {
- // The argument to the runtime call is the extra copy of the receiver,
- // which is below the value of the assignment. Swap the receiver and
- // the value of the assignment expression.
- Result result = frame()->Pop();
- Result receiver = frame()->Pop();
- frame()->Push(&result);
- frame()->Push(&receiver);
- Result ignored = frame_->CallRuntime(Runtime::kToFastProperties, 1);
- }
-
- // Stack layout:
- // [tos] : result
-
- ASSERT(frame()->height() == original_height + 1);
-}
-
-
-void CodeGenerator::VisitAssignment(Assignment* node) {
- ASSERT(!in_safe_int32_mode());
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- Property* prop = node->target()->AsProperty();
-
- if (var != NULL && !var->is_global()) {
- EmitSlotAssignment(node);
-
- } else if ((prop != NULL && prop->key()->IsPropertyName()) ||
- (var != NULL && var->is_global())) {
- // Properties whose keys are property names and global variables are
- // treated as named property references. We do not need to consider
- // global 'this' because it is not a valid left-hand side.
- EmitNamedPropertyAssignment(node);
-
- } else if (prop != NULL) {
- // Other properties (including rewritten parameters for a function that
- // uses arguments) are keyed property assignments.
- EmitKeyedPropertyAssignment(node);
-
- } else {
- // Invalid left-hand side.
- Load(node->target());
- Result result = frame()->CallRuntime(Runtime::kThrowReferenceError, 1);
- // The runtime call doesn't actually return but the code generator will
- // still generate code and expects a certain frame height.
- frame()->Push(&result);
- }
-
- ASSERT(frame()->height() == original_height + 1);
-}
-
-
-void CodeGenerator::VisitThrow(Throw* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ Throw");
- Load(node->exception());
- Result result = frame_->CallRuntime(Runtime::kThrow, 1);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::VisitProperty(Property* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ Property");
- Reference property(this, node);
- property.GetValue();
-}
-
-
-void CodeGenerator::VisitCall(Call* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ Call");
-
- Expression* function = node->expression();
- ZoneList<Expression*>* args = node->arguments();
-
- // Check if the function is a variable or a property.
- Variable* var = function->AsVariableProxy()->AsVariable();
- Property* property = function->AsProperty();
-
- // ------------------------------------------------------------------------
- // Fast-case: Use inline caching.
- // ---
- // According to ECMA-262, section 11.2.3, page 44, the function to call
- // must be resolved after the arguments have been evaluated. The IC code
- // automatically handles this by loading the arguments before the function
- // is resolved in cache misses (this also holds for megamorphic calls).
- // ------------------------------------------------------------------------
-
- if (var != NULL && var->is_possibly_eval()) {
- // ----------------------------------
- // JavaScript example: 'eval(arg)' // eval is not known to be shadowed
- // ----------------------------------
-
- // In a call to eval, we first call %ResolvePossiblyDirectEval to
- // resolve the function we need to call and the receiver of the
- // call. Then we call the resolved function using the given
- // arguments.
-
- // Prepare the stack for the call to the resolved function.
- Load(function);
-
- // Allocate a frame slot for the receiver.
- frame_->Push(FACTORY->undefined_value());
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Result to hold the result of the function resolution and the
- // final result of the eval call.
- Result result;
-
- // If we know that eval can only be shadowed by eval-introduced
- // variables we attempt to load the global eval function directly
- // in generated code. If we succeed, there is no need to perform a
- // context lookup in the runtime system.
- JumpTarget done;
- if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
- ASSERT(var->AsSlot()->type() == Slot::LOOKUP);
- JumpTarget slow;
- // Prepare the stack for the call to
- // ResolvePossiblyDirectEvalNoLookup by pushing the loaded
- // function, the first argument to the eval call and the
- // receiver.
- Result fun = LoadFromGlobalSlotCheckExtensions(var->AsSlot(),
- NOT_INSIDE_TYPEOF,
- &slow);
- frame_->Push(&fun);
- if (arg_count > 0) {
- frame_->PushElementAt(arg_count);
- } else {
- frame_->Push(FACTORY->undefined_value());
- }
- frame_->PushParameterAt(-1);
-
- // Push the strict mode flag.
- frame_->Push(Smi::FromInt(strict_mode_flag()));
-
- // Resolve the call.
- result =
- frame_->CallRuntime(Runtime::kResolvePossiblyDirectEvalNoLookup, 4);
-
- done.Jump(&result);
- slow.Bind();
- }
-
- // Prepare the stack for the call to ResolvePossiblyDirectEval by
- // pushing the loaded function, the first argument to the eval
- // call and the receiver.
- frame_->PushElementAt(arg_count + 1);
- if (arg_count > 0) {
- frame_->PushElementAt(arg_count);
- } else {
- frame_->Push(FACTORY->undefined_value());
- }
- frame_->PushParameterAt(-1);
-
- // Push the strict mode flag.
- frame_->Push(Smi::FromInt(strict_mode_flag()));
-
- // Resolve the call.
- result = frame_->CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
-
- // If we generated fast-case code bind the jump-target where fast
- // and slow case merge.
- if (done.is_linked()) done.Bind(&result);
-
- // The runtime call returns a pair of values in eax (function) and
- // edx (receiver). Touch up the stack with the right values.
- Result receiver = allocator_->Allocate(edx);
- frame_->SetElementAt(arg_count + 1, &result);
- frame_->SetElementAt(arg_count, &receiver);
- receiver.Unuse();
-
- // Call the function.
- CodeForSourcePosition(node->position());
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- CallFunctionStub call_function(arg_count, in_loop, RECEIVER_MIGHT_BE_VALUE);
- result = frame_->CallStub(&call_function, arg_count + 1);
-
- // Restore the context and overwrite the function on the stack with
- // the result.
- frame_->RestoreContextRegister();
- frame_->SetElementAt(0, &result);
-
- } else if (var != NULL && !var->is_this() && var->is_global()) {
- // ----------------------------------
- // JavaScript example: 'foo(1, 2, 3)' // foo is global
- // ----------------------------------
-
- // Pass the global object as the receiver and let the IC stub
- // patch the stack to use the global proxy as 'this' in the
- // invoked function.
- LoadGlobal();
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Push the name of the function onto the frame.
- frame_->Push(var->name());
-
- // Call the IC initialization code.
- CodeForSourcePosition(node->position());
- Result result = frame_->CallCallIC(RelocInfo::CODE_TARGET_CONTEXT,
- arg_count,
- loop_nesting());
- frame_->RestoreContextRegister();
- frame_->Push(&result);
-
- } else if (var != NULL && var->AsSlot() != NULL &&
- var->AsSlot()->type() == Slot::LOOKUP) {
- // ----------------------------------
- // JavaScript examples:
- //
- // with (obj) foo(1, 2, 3) // foo may be in obj.
- //
- // function f() {};
- // function g() {
- // eval(...);
- // f(); // f could be in extension object.
- // }
- // ----------------------------------
-
- JumpTarget slow, done;
- Result function;
-
- // Generate fast case for loading functions from slots that
- // correspond to local/global variables or arguments unless they
- // are shadowed by eval-introduced bindings.
- EmitDynamicLoadFromSlotFastCase(var->AsSlot(),
- NOT_INSIDE_TYPEOF,
- &function,
- &slow,
- &done);
-
- slow.Bind();
- // Enter the runtime system to load the function from the context.
- // Sync the frame so we can push the arguments directly into
- // place.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(esi);
- frame_->EmitPush(Immediate(var->name()));
- frame_->CallRuntime(Runtime::kLoadContextSlot, 2);
- // The runtime call returns a pair of values in eax and edx. The
- // looked-up function is in eax and the receiver is in edx. These
- // register references are not ref counted here. We spill them
- // eagerly since they are arguments to an inevitable call (and are
- // not sharable by the arguments).
- ASSERT(!allocator()->is_used(eax));
- frame_->EmitPush(eax);
-
- // Load the receiver.
- ASSERT(!allocator()->is_used(edx));
- frame_->EmitPush(edx);
-
- // If fast case code has been generated, emit code to push the
- // function and receiver and have the slow path jump around this
- // code.
- if (done.is_linked()) {
- JumpTarget call;
- call.Jump();
- done.Bind(&function);
- frame_->Push(&function);
- LoadGlobalReceiver();
- call.Bind();
- }
-
- // Call the function.
- CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position());
-
- } else if (property != NULL) {
- // Check if the key is a literal string.
- Literal* literal = property->key()->AsLiteral();
-
- if (literal != NULL && literal->handle()->IsSymbol()) {
- // ------------------------------------------------------------------
- // JavaScript example: 'object.foo(1, 2, 3)' or 'map["key"](1, 2, 3)'
- // ------------------------------------------------------------------
-
- Handle<String> name = Handle<String>::cast(literal->handle());
-
- if (ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION &&
- name->IsEqualTo(CStrVector("apply")) &&
- args->length() == 2 &&
- args->at(1)->AsVariableProxy() != NULL &&
- args->at(1)->AsVariableProxy()->IsArguments()) {
- // Use the optimized Function.prototype.apply that avoids
- // allocating lazily allocated arguments objects.
- CallApplyLazy(property->obj(),
- args->at(0),
- args->at(1)->AsVariableProxy(),
- node->position());
-
- } else {
- // Push the receiver onto the frame.
- Load(property->obj());
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Push the name of the function onto the frame.
- frame_->Push(name);
-
- // Call the IC initialization code.
- CodeForSourcePosition(node->position());
- Result result =
- frame_->CallCallIC(RelocInfo::CODE_TARGET, arg_count,
- loop_nesting());
- frame_->RestoreContextRegister();
- frame_->Push(&result);
- }
-
- } else {
- // -------------------------------------------
- // JavaScript example: 'array[index](1, 2, 3)'
- // -------------------------------------------
-
- // Load the function to call from the property through a reference.
-
- // Pass receiver to called function.
- if (property->is_synthetic()) {
- Reference ref(this, property);
- ref.GetValue();
- // Use global object as receiver.
- LoadGlobalReceiver();
- // Call the function.
- CallWithArguments(args, RECEIVER_MIGHT_BE_VALUE, node->position());
- } else {
- // Push the receiver onto the frame.
- Load(property->obj());
-
- // Load the name of the function.
- Load(property->key());
-
- // Swap the name of the function and the receiver on the stack to follow
- // the calling convention for call ICs.
- Result key = frame_->Pop();
- Result receiver = frame_->Pop();
- frame_->Push(&key);
- frame_->Push(&receiver);
- key.Unuse();
- receiver.Unuse();
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Place the key on top of stack and call the IC initialization code.
- frame_->PushElementAt(arg_count + 1);
- CodeForSourcePosition(node->position());
- Result result =
- frame_->CallKeyedCallIC(RelocInfo::CODE_TARGET,
- arg_count,
- loop_nesting());
- frame_->Drop(); // Drop the key still on the stack.
- frame_->RestoreContextRegister();
- frame_->Push(&result);
- }
- }
-
- } else {
- // ----------------------------------
- // JavaScript example: 'foo(1, 2, 3)' // foo is not global
- // ----------------------------------
-
- // Load the function.
- Load(function);
-
- // Pass the global proxy as the receiver.
- LoadGlobalReceiver();
-
- // Call the function.
- CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position());
- }
-}
-
-
-void CodeGenerator::VisitCallNew(CallNew* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ CallNew");
-
- // According to ECMA-262, section 11.2.2, page 44, the function
- // expression in new calls must be evaluated before the
- // arguments. This is different from ordinary calls, where the
- // actual function to call is resolved after the arguments have been
- // evaluated.
-
- // Push constructor on the stack. If it's not a function it's used as
- // receiver for CALL_NON_FUNCTION, otherwise the value on the stack is
- // ignored.
- Load(node->expression());
-
- // Push the arguments ("left-to-right") on the stack.
- ZoneList<Expression*>* args = node->arguments();
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- // Call the construct call builtin that handles allocation and
- // constructor invocation.
- CodeForSourcePosition(node->position());
- Result result = frame_->CallConstructor(arg_count);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateIsSmi(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- __ test(value.reg(), Immediate(kSmiTagMask));
- value.Unuse();
- destination()->Split(zero);
-}
-
-
-void CodeGenerator::GenerateLog(ZoneList<Expression*>* args) {
- // Conditionally generate a log call.
- // Args:
- // 0 (literal string): The type of logging (corresponds to the flags).
- // This is used to determine whether or not to generate the log call.
- // 1 (string): Format string. Access the string at argument index 2
- // with '%2s' (see Logger::LogRuntime for all the formats).
- // 2 (array): Arguments to the format string.
- ASSERT_EQ(args->length(), 3);
-#ifdef ENABLE_LOGGING_AND_PROFILING
- if (ShouldGenerateLog(args->at(0))) {
- Load(args->at(1));
- Load(args->at(2));
- frame_->CallRuntime(Runtime::kLog, 2);
- }
-#endif
- // Finally, we're expected to leave a value on the top of the stack.
- frame_->Push(FACTORY->undefined_value());
-}
-
-
-void CodeGenerator::GenerateIsNonNegativeSmi(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- __ test(value.reg(), Immediate(kSmiTagMask | kSmiSignMask));
- value.Unuse();
- destination()->Split(zero);
-}
-
-
-class DeferredStringCharCodeAt : public DeferredCode {
- public:
- DeferredStringCharCodeAt(Register object,
- Register index,
- Register scratch,
- Register result)
- : result_(result),
- char_code_at_generator_(object,
- index,
- scratch,
- result,
- &need_conversion_,
- &need_conversion_,
- &index_out_of_range_,
- STRING_INDEX_IS_NUMBER) {}
-
- StringCharCodeAtGenerator* fast_case_generator() {
- return &char_code_at_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_code_at_generator_.GenerateSlow(masm(), call_helper);
-
- __ bind(&need_conversion_);
- // Move the undefined value into the result register, which will
- // trigger conversion.
- __ Set(result_, Immediate(FACTORY->undefined_value()));
- __ jmp(exit_label());
-
- __ bind(&index_out_of_range_);
- // When the index is out of range, the spec requires us to return
- // NaN.
- __ Set(result_, Immediate(FACTORY->nan_value()));
- __ jmp(exit_label());
- }
-
- private:
- Register result_;
-
- Label need_conversion_;
- Label index_out_of_range_;
-
- StringCharCodeAtGenerator char_code_at_generator_;
-};
-
-
-// This generates code that performs a String.prototype.charCodeAt() call
-// or returns a smi in order to trigger conversion.
-void CodeGenerator::GenerateStringCharCodeAt(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharCodeAt");
- ASSERT(args->length() == 2);
-
- Load(args->at(0));
- Load(args->at(1));
- Result index = frame_->Pop();
- Result object = frame_->Pop();
- object.ToRegister();
- index.ToRegister();
- // We might mutate the object register.
- frame_->Spill(object.reg());
-
- // We need two extra registers.
- Result result = allocator()->Allocate();
- ASSERT(result.is_valid());
- Result scratch = allocator()->Allocate();
- ASSERT(scratch.is_valid());
-
- DeferredStringCharCodeAt* deferred =
- new DeferredStringCharCodeAt(object.reg(),
- index.reg(),
- scratch.reg(),
- result.reg());
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->Push(&result);
-}
-
-
-class DeferredStringCharFromCode : public DeferredCode {
- public:
- DeferredStringCharFromCode(Register code,
- Register result)
- : char_from_code_generator_(code, result) {}
-
- StringCharFromCodeGenerator* fast_case_generator() {
- return &char_from_code_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_from_code_generator_.GenerateSlow(masm(), call_helper);
- }
-
- private:
- StringCharFromCodeGenerator char_from_code_generator_;
-};
-
-
-// Generates code for creating a one-char string from a char code.
-void CodeGenerator::GenerateStringCharFromCode(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharFromCode");
- ASSERT(args->length() == 1);
-
- Load(args->at(0));
-
- Result code = frame_->Pop();
- code.ToRegister();
- ASSERT(code.is_valid());
-
- Result result = allocator()->Allocate();
- ASSERT(result.is_valid());
-
- DeferredStringCharFromCode* deferred = new DeferredStringCharFromCode(
- code.reg(), result.reg());
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->Push(&result);
-}
-
-
-class DeferredStringCharAt : public DeferredCode {
- public:
- DeferredStringCharAt(Register object,
- Register index,
- Register scratch1,
- Register scratch2,
- Register result)
- : result_(result),
- char_at_generator_(object,
- index,
- scratch1,
- scratch2,
- result,
- &need_conversion_,
- &need_conversion_,
- &index_out_of_range_,
- STRING_INDEX_IS_NUMBER) {}
-
- StringCharAtGenerator* fast_case_generator() {
- return &char_at_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_at_generator_.GenerateSlow(masm(), call_helper);
-
- __ bind(&need_conversion_);
- // Move smi zero into the result register, which will trigger
- // conversion.
- __ Set(result_, Immediate(Smi::FromInt(0)));
- __ jmp(exit_label());
-
- __ bind(&index_out_of_range_);
- // When the index is out of range, the spec requires us to return
- // the empty string.
- __ Set(result_, Immediate(FACTORY->empty_string()));
- __ jmp(exit_label());
- }
-
- private:
- Register result_;
-
- Label need_conversion_;
- Label index_out_of_range_;
-
- StringCharAtGenerator char_at_generator_;
-};
-
-
-// This generates code that performs a String.prototype.charAt() call
-// or returns a smi in order to trigger conversion.
-void CodeGenerator::GenerateStringCharAt(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharAt");
- ASSERT(args->length() == 2);
-
- Load(args->at(0));
- Load(args->at(1));
- Result index = frame_->Pop();
- Result object = frame_->Pop();
- object.ToRegister();
- index.ToRegister();
- // We might mutate the object register.
- frame_->Spill(object.reg());
-
- // We need three extra registers.
- Result result = allocator()->Allocate();
- ASSERT(result.is_valid());
- Result scratch1 = allocator()->Allocate();
- ASSERT(scratch1.is_valid());
- Result scratch2 = allocator()->Allocate();
- ASSERT(scratch2.is_valid());
-
- DeferredStringCharAt* deferred =
- new DeferredStringCharAt(object.reg(),
- index.reg(),
- scratch1.reg(),
- scratch2.reg(),
- result.reg());
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- __ test(value.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(equal);
- // It is a heap object - get map.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- // Check if the object is a JS array or not.
- __ CmpObjectType(value.reg(), JS_ARRAY_TYPE, temp.reg());
- value.Unuse();
- temp.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args) {
- Label bailout, done, one_char_separator, long_separator,
- non_trivial_array, not_size_one_array, loop, loop_condition,
- loop_1, loop_1_condition, loop_2, loop_2_entry, loop_3, loop_3_entry;
-
- ASSERT(args->length() == 2);
- // We will leave the separator on the stack until the end of the function.
- Load(args->at(1));
- // Load this to eax (= array)
- Load(args->at(0));
- Result array_result = frame_->Pop();
- array_result.ToRegister(eax);
- frame_->SpillAll();
-
- // All aliases of the same register have disjoint lifetimes.
- Register array = eax;
- Register elements = no_reg; // Will be eax.
-
- Register index = edx;
-
- Register string_length = ecx;
-
- Register string = esi;
-
- Register scratch = ebx;
-
- Register array_length = edi;
- Register result_pos = no_reg; // Will be edi.
-
- // Separator operand is already pushed.
- Operand separator_operand = Operand(esp, 2 * kPointerSize);
- Operand result_operand = Operand(esp, 1 * kPointerSize);
- Operand array_length_operand = Operand(esp, 0);
- __ sub(Operand(esp), Immediate(2 * kPointerSize));
- __ cld();
- // Check that the array is a JSArray
- __ test(array, Immediate(kSmiTagMask));
- __ j(zero, &bailout);
- __ CmpObjectType(array, JS_ARRAY_TYPE, scratch);
- __ j(not_equal, &bailout);
-
- // Check that the array has fast elements.
- __ test_b(FieldOperand(scratch, Map::kBitField2Offset),
- 1 << Map::kHasFastElements);
- __ j(zero, &bailout);
-
- // If the array has length zero, return the empty string.
- __ mov(array_length, FieldOperand(array, JSArray::kLengthOffset));
- __ sar(array_length, 1);
- __ j(not_zero, &non_trivial_array);
- __ mov(result_operand, FACTORY->empty_string());
- __ jmp(&done);
-
- // Save the array length.
- __ bind(&non_trivial_array);
- __ mov(array_length_operand, array_length);
-
- // Save the FixedArray containing array's elements.
- // End of array's live range.
- elements = array;
- __ mov(elements, FieldOperand(array, JSArray::kElementsOffset));
- array = no_reg;
-
-
- // Check that all array elements are sequential ASCII strings, and
- // accumulate the sum of their lengths, as a smi-encoded value.
- __ Set(index, Immediate(0));
- __ Set(string_length, Immediate(0));
- // Loop condition: while (index < length).
- // Live loop registers: index, array_length, string,
- // scratch, string_length, elements.
- __ jmp(&loop_condition);
- __ bind(&loop);
- __ cmp(index, Operand(array_length));
- __ j(greater_equal, &done);
-
- __ mov(string, FieldOperand(elements, index,
- times_pointer_size,
- FixedArray::kHeaderSize));
- __ test(string, Immediate(kSmiTagMask));
- __ j(zero, &bailout);
- __ mov(scratch, FieldOperand(string, HeapObject::kMapOffset));
- __ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset));
- __ and_(scratch, Immediate(
- kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask));
- __ cmp(scratch, kStringTag | kAsciiStringTag | kSeqStringTag);
- __ j(not_equal, &bailout);
- __ add(string_length,
- FieldOperand(string, SeqAsciiString::kLengthOffset));
- __ j(overflow, &bailout);
- __ add(Operand(index), Immediate(1));
- __ bind(&loop_condition);
- __ cmp(index, Operand(array_length));
- __ j(less, &loop);
-
- // If array_length is 1, return elements[0], a string.
- __ cmp(array_length, 1);
- __ j(not_equal, ¬_size_one_array);
- __ mov(scratch, FieldOperand(elements, FixedArray::kHeaderSize));
- __ mov(result_operand, scratch);
- __ jmp(&done);
-
- __ bind(¬_size_one_array);
-
- // End of array_length live range.
- result_pos = array_length;
- array_length = no_reg;
-
- // Live registers:
- // string_length: Sum of string lengths, as a smi.
- // elements: FixedArray of strings.
-
- // Check that the separator is a flat ASCII string.
- __ mov(string, separator_operand);
- __ test(string, Immediate(kSmiTagMask));
- __ j(zero, &bailout);
- __ mov(scratch, FieldOperand(string, HeapObject::kMapOffset));
- __ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset));
- __ and_(scratch, Immediate(
- kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask));
- __ cmp(scratch, kStringTag | kAsciiStringTag | kSeqStringTag);
- __ j(not_equal, &bailout);
-
- // Add (separator length times array_length) - separator length
- // to string_length.
- __ mov(scratch, separator_operand);
- __ mov(scratch, FieldOperand(scratch, SeqAsciiString::kLengthOffset));
- __ sub(string_length, Operand(scratch)); // May be negative, temporarily.
- __ imul(scratch, array_length_operand);
- __ j(overflow, &bailout);
- __ add(string_length, Operand(scratch));
- __ j(overflow, &bailout);
-
- __ shr(string_length, 1);
- // Live registers and stack values:
- // string_length
- // elements
- __ AllocateAsciiString(result_pos, string_length, scratch,
- index, string, &bailout);
- __ mov(result_operand, result_pos);
- __ lea(result_pos, FieldOperand(result_pos, SeqAsciiString::kHeaderSize));
-
-
- __ mov(string, separator_operand);
- __ cmp(FieldOperand(string, SeqAsciiString::kLengthOffset),
- Immediate(Smi::FromInt(1)));
- __ j(equal, &one_char_separator);
- __ j(greater, &long_separator);
-
-
- // Empty separator case
- __ mov(index, Immediate(0));
- __ jmp(&loop_1_condition);
- // Loop condition: while (index < length).
- __ bind(&loop_1);
- // Each iteration of the loop concatenates one string to the result.
- // Live values in registers:
- // index: which element of the elements array we are adding to the result.
- // result_pos: the position to which we are currently copying characters.
- // elements: the FixedArray of strings we are joining.
-
- // Get string = array[index].
- __ mov(string, FieldOperand(elements, index,
- times_pointer_size,
- FixedArray::kHeaderSize));
- __ mov(string_length,
- FieldOperand(string, String::kLengthOffset));
- __ shr(string_length, 1);
- __ lea(string,
- FieldOperand(string, SeqAsciiString::kHeaderSize));
- __ CopyBytes(string, result_pos, string_length, scratch);
- __ add(Operand(index), Immediate(1));
- __ bind(&loop_1_condition);
- __ cmp(index, array_length_operand);
- __ j(less, &loop_1); // End while (index < length).
- __ jmp(&done);
-
-
-
- // One-character separator case
- __ bind(&one_char_separator);
- // Replace separator with its ascii character value.
- __ mov_b(scratch, FieldOperand(string, SeqAsciiString::kHeaderSize));
- __ mov_b(separator_operand, scratch);
-
- __ Set(index, Immediate(0));
- // Jump into the loop after the code that copies the separator, so the first
- // element is not preceded by a separator
- __ jmp(&loop_2_entry);
- // Loop condition: while (index < length).
- __ bind(&loop_2);
- // Each iteration of the loop concatenates one string to the result.
- // Live values in registers:
- // index: which element of the elements array we are adding to the result.
- // result_pos: the position to which we are currently copying characters.
-
- // Copy the separator character to the result.
- __ mov_b(scratch, separator_operand);
- __ mov_b(Operand(result_pos, 0), scratch);
- __ inc(result_pos);
-
- __ bind(&loop_2_entry);
- // Get string = array[index].
- __ mov(string, FieldOperand(elements, index,
- times_pointer_size,
- FixedArray::kHeaderSize));
- __ mov(string_length,
- FieldOperand(string, String::kLengthOffset));
- __ shr(string_length, 1);
- __ lea(string,
- FieldOperand(string, SeqAsciiString::kHeaderSize));
- __ CopyBytes(string, result_pos, string_length, scratch);
- __ add(Operand(index), Immediate(1));
-
- __ cmp(index, array_length_operand);
- __ j(less, &loop_2); // End while (index < length).
- __ jmp(&done);
-
-
- // Long separator case (separator is more than one character).
- __ bind(&long_separator);
-
- __ Set(index, Immediate(0));
- // Jump into the loop after the code that copies the separator, so the first
- // element is not preceded by a separator
- __ jmp(&loop_3_entry);
- // Loop condition: while (index < length).
- __ bind(&loop_3);
- // Each iteration of the loop concatenates one string to the result.
- // Live values in registers:
- // index: which element of the elements array we are adding to the result.
- // result_pos: the position to which we are currently copying characters.
-
- // Copy the separator to the result.
- __ mov(string, separator_operand);
- __ mov(string_length,
- FieldOperand(string, String::kLengthOffset));
- __ shr(string_length, 1);
- __ lea(string,
- FieldOperand(string, SeqAsciiString::kHeaderSize));
- __ CopyBytes(string, result_pos, string_length, scratch);
-
- __ bind(&loop_3_entry);
- // Get string = array[index].
- __ mov(string, FieldOperand(elements, index,
- times_pointer_size,
- FixedArray::kHeaderSize));
- __ mov(string_length,
- FieldOperand(string, String::kLengthOffset));
- __ shr(string_length, 1);
- __ lea(string,
- FieldOperand(string, SeqAsciiString::kHeaderSize));
- __ CopyBytes(string, result_pos, string_length, scratch);
- __ add(Operand(index), Immediate(1));
-
- __ cmp(index, array_length_operand);
- __ j(less, &loop_3); // End while (index < length).
- __ jmp(&done);
-
-
- __ bind(&bailout);
- __ mov(result_operand, FACTORY->undefined_value());
- __ bind(&done);
- __ mov(eax, result_operand);
- // Drop temp values from the stack, and restore context register.
- __ add(Operand(esp), Immediate(2 * kPointerSize));
-
- __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
- frame_->Drop(1);
- frame_->Push(&array_result);
-}
-
-
-void CodeGenerator::GenerateIsRegExp(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- __ test(value.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(equal);
- // It is a heap object - get map.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- // Check if the object is a regexp.
- __ CmpObjectType(value.reg(), JS_REGEXP_TYPE, temp.reg());
- value.Unuse();
- temp.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp')
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop();
- obj.ToRegister();
-
- __ test(obj.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
- __ cmp(obj.reg(), FACTORY->null_value());
- destination()->true_target()->Branch(equal);
-
- Result map = allocator()->Allocate();
- ASSERT(map.is_valid());
- __ mov(map.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset));
- // Undetectable objects behave like undefined when tested with typeof.
- __ test_b(FieldOperand(map.reg(), Map::kBitFieldOffset),
- 1 << Map::kIsUndetectable);
- destination()->false_target()->Branch(not_zero);
- // Do a range test for JSObject type. We can't use
- // MacroAssembler::IsInstanceJSObjectType, because we are using a
- // ControlDestination, so we copy its implementation here.
- __ movzx_b(map.reg(), FieldOperand(map.reg(), Map::kInstanceTypeOffset));
- __ sub(Operand(map.reg()), Immediate(FIRST_JS_OBJECT_TYPE));
- __ cmp(map.reg(), LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE);
- obj.Unuse();
- map.Unuse();
- destination()->Split(below_equal);
-}
-
-
-void CodeGenerator::GenerateIsSpecObject(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp' ||
- // typeof(arg) == function).
- // It includes undetectable objects (as opposed to IsObject).
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- __ test(value.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(equal);
-
- // Check that this is an object.
- frame_->Spill(value.reg());
- __ CmpObjectType(value.reg(), FIRST_JS_OBJECT_TYPE, value.reg());
- value.Unuse();
- destination()->Split(above_equal);
-}
-
-
-// Deferred code to check whether the String JavaScript object is safe for using
-// default value of. This code is called after the bit caching this information
-// in the map has been checked with the map for the object in the map_result_
-// register. On return the register map_result_ contains 1 for true and 0 for
-// false.
-class DeferredIsStringWrapperSafeForDefaultValueOf : public DeferredCode {
- public:
- DeferredIsStringWrapperSafeForDefaultValueOf(Register object,
- Register map_result,
- Register scratch1,
- Register scratch2)
- : object_(object),
- map_result_(map_result),
- scratch1_(scratch1),
- scratch2_(scratch2) { }
-
- virtual void Generate() {
- Label false_result;
-
- // Check that map is loaded as expected.
- if (FLAG_debug_code) {
- __ cmp(map_result_, FieldOperand(object_, HeapObject::kMapOffset));
- __ Assert(equal, "Map not in expected register");
- }
-
- // Check for fast case object. Generate false result for slow case object.
- __ mov(scratch1_, FieldOperand(object_, JSObject::kPropertiesOffset));
- __ mov(scratch1_, FieldOperand(scratch1_, HeapObject::kMapOffset));
- __ cmp(scratch1_, FACTORY->hash_table_map());
- __ j(equal, &false_result);
-
- // Look for valueOf symbol in the descriptor array, and indicate false if
- // found. The type is not checked, so if it is a transition it is a false
- // negative.
- __ mov(map_result_,
- FieldOperand(map_result_, Map::kInstanceDescriptorsOffset));
- __ mov(scratch1_, FieldOperand(map_result_, FixedArray::kLengthOffset));
- // map_result_: descriptor array
- // scratch1_: length of descriptor array
- // Calculate the end of the descriptor array.
- STATIC_ASSERT(kSmiTag == 0);
- STATIC_ASSERT(kSmiTagSize == 1);
- STATIC_ASSERT(kPointerSize == 4);
- __ lea(scratch1_,
- Operand(map_result_, scratch1_, times_2, FixedArray::kHeaderSize));
- // Calculate location of the first key name.
- __ add(Operand(map_result_),
- Immediate(FixedArray::kHeaderSize +
- DescriptorArray::kFirstIndex * kPointerSize));
- // Loop through all the keys in the descriptor array. If one of these is the
- // symbol valueOf the result is false.
- Label entry, loop;
- __ jmp(&entry);
- __ bind(&loop);
- __ mov(scratch2_, FieldOperand(map_result_, 0));
- __ cmp(scratch2_, FACTORY->value_of_symbol());
- __ j(equal, &false_result);
- __ add(Operand(map_result_), Immediate(kPointerSize));
- __ bind(&entry);
- __ cmp(map_result_, Operand(scratch1_));
- __ j(not_equal, &loop);
-
- // Reload map as register map_result_ was used as temporary above.
- __ mov(map_result_, FieldOperand(object_, HeapObject::kMapOffset));
-
- // If a valueOf property is not found on the object check that it's
- // prototype is the un-modified String prototype. If not result is false.
- __ mov(scratch1_, FieldOperand(map_result_, Map::kPrototypeOffset));
- __ test(scratch1_, Immediate(kSmiTagMask));
- __ j(zero, &false_result);
- __ mov(scratch1_, FieldOperand(scratch1_, HeapObject::kMapOffset));
- __ mov(scratch2_, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
- __ mov(scratch2_,
- FieldOperand(scratch2_, GlobalObject::kGlobalContextOffset));
- __ cmp(scratch1_,
- ContextOperand(scratch2_,
- Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX));
- __ j(not_equal, &false_result);
- // Set the bit in the map to indicate that it has been checked safe for
- // default valueOf and set true result.
- __ or_(FieldOperand(map_result_, Map::kBitField2Offset),
- Immediate(1 << Map::kStringWrapperSafeForDefaultValueOf));
- __ Set(map_result_, Immediate(1));
- __ jmp(exit_label());
- __ bind(&false_result);
- // Set false result.
- __ Set(map_result_, Immediate(0));
- }
-
- private:
- Register object_;
- Register map_result_;
- Register scratch1_;
- Register scratch2_;
-};
-
-
-void CodeGenerator::GenerateIsStringWrapperSafeForDefaultValueOf(
- ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop(); // Pop the string wrapper.
- obj.ToRegister();
- ASSERT(obj.is_valid());
- if (FLAG_debug_code) {
- __ AbortIfSmi(obj.reg());
- }
-
- // Check whether this map has already been checked to be safe for default
- // valueOf.
- Result map_result = allocator()->Allocate();
- ASSERT(map_result.is_valid());
- __ mov(map_result.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset));
- __ test_b(FieldOperand(map_result.reg(), Map::kBitField2Offset),
- 1 << Map::kStringWrapperSafeForDefaultValueOf);
- destination()->true_target()->Branch(not_zero);
-
- // We need an additional two scratch registers for the deferred code.
- Result temp1 = allocator()->Allocate();
- ASSERT(temp1.is_valid());
- Result temp2 = allocator()->Allocate();
- ASSERT(temp2.is_valid());
-
- DeferredIsStringWrapperSafeForDefaultValueOf* deferred =
- new DeferredIsStringWrapperSafeForDefaultValueOf(
- obj.reg(), map_result.reg(), temp1.reg(), temp2.reg());
- deferred->Branch(zero);
- deferred->BindExit();
- __ test(map_result.reg(), Operand(map_result.reg()));
- obj.Unuse();
- map_result.Unuse();
- temp1.Unuse();
- temp2.Unuse();
- destination()->Split(not_equal);
-}
-
-
-void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (%_ClassOf(arg) === 'Function')
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop();
- obj.ToRegister();
- __ test(obj.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, temp.reg());
- obj.Unuse();
- temp.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateIsUndetectableObject(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop();
- obj.ToRegister();
- __ test(obj.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(),
- FieldOperand(obj.reg(), HeapObject::kMapOffset));
- __ test_b(FieldOperand(temp.reg(), Map::kBitFieldOffset),
- 1 << Map::kIsUndetectable);
- obj.Unuse();
- temp.Unuse();
- destination()->Split(not_zero);
-}
-
-
-void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
-
- // Get the frame pointer for the calling frame.
- Result fp = allocator()->Allocate();
- __ mov(fp.reg(), Operand(ebp, StandardFrameConstants::kCallerFPOffset));
-
- // Skip the arguments adaptor frame if it exists.
- Label check_frame_marker;
- __ cmp(Operand(fp.reg(), StandardFrameConstants::kContextOffset),
- Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
- __ j(not_equal, &check_frame_marker);
- __ mov(fp.reg(), Operand(fp.reg(), StandardFrameConstants::kCallerFPOffset));
-
- // Check the marker in the calling frame.
- __ bind(&check_frame_marker);
- __ cmp(Operand(fp.reg(), StandardFrameConstants::kMarkerOffset),
- Immediate(Smi::FromInt(StackFrame::CONSTRUCT)));
- fp.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
-
- Result fp = allocator_->Allocate();
- Result result = allocator_->Allocate();
- ASSERT(fp.is_valid() && result.is_valid());
-
- Label exit;
-
- // Get the number of formal parameters.
- __ Set(result.reg(), Immediate(Smi::FromInt(scope()->num_parameters())));
-
- // Check if the calling frame is an arguments adaptor frame.
- __ mov(fp.reg(), Operand(ebp, StandardFrameConstants::kCallerFPOffset));
- __ cmp(Operand(fp.reg(), StandardFrameConstants::kContextOffset),
- Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
- __ j(not_equal, &exit);
-
- // Arguments adaptor case: Read the arguments length from the
- // adaptor frame.
- __ mov(result.reg(),
- Operand(fp.reg(), ArgumentsAdaptorFrameConstants::kLengthOffset));
-
- __ bind(&exit);
- result.set_type_info(TypeInfo::Smi());
- if (FLAG_debug_code) __ AbortIfNotSmi(result.reg());
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateClassOf(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- JumpTarget leave, null, function, non_function_constructor;
- Load(args->at(0)); // Load the object.
- Result obj = frame_->Pop();
- obj.ToRegister();
- frame_->Spill(obj.reg());
-
- // If the object is a smi, we return null.
- __ test(obj.reg(), Immediate(kSmiTagMask));
- null.Branch(zero);
-
- // Check that the object is a JS object but take special care of JS
- // functions to make sure they have 'Function' as their class.
- __ CmpObjectType(obj.reg(), FIRST_JS_OBJECT_TYPE, obj.reg());
- null.Branch(below);
-
- // As long as JS_FUNCTION_TYPE is the last instance type and it is
- // right after LAST_JS_OBJECT_TYPE, we can avoid checking for
- // LAST_JS_OBJECT_TYPE.
- STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
- STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
- __ CmpInstanceType(obj.reg(), JS_FUNCTION_TYPE);
- function.Branch(equal);
-
- // Check if the constructor in the map is a function.
- { Result tmp = allocator()->Allocate();
- __ mov(obj.reg(), FieldOperand(obj.reg(), Map::kConstructorOffset));
- __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, tmp.reg());
- non_function_constructor.Branch(not_equal);
- }
-
- // The map register now contains the constructor function. Grab the
- // instance class name from there.
- __ mov(obj.reg(),
- FieldOperand(obj.reg(), JSFunction::kSharedFunctionInfoOffset));
- __ mov(obj.reg(),
- FieldOperand(obj.reg(), SharedFunctionInfo::kInstanceClassNameOffset));
- frame_->Push(&obj);
- leave.Jump();
-
- // Functions have class 'Function'.
- function.Bind();
- frame_->Push(FACTORY->function_class_symbol());
- leave.Jump();
-
- // Objects with a non-function constructor have class 'Object'.
- non_function_constructor.Bind();
- frame_->Push(FACTORY->Object_symbol());
- leave.Jump();
-
- // Non-JS objects have class null.
- null.Bind();
- frame_->Push(FACTORY->null_value());
-
- // All done.
- leave.Bind();
-}
-
-
-void CodeGenerator::GenerateValueOf(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- JumpTarget leave;
- Load(args->at(0)); // Load the object.
- frame_->Dup();
- Result object = frame_->Pop();
- object.ToRegister();
- ASSERT(object.is_valid());
- // if (object->IsSmi()) return object.
- __ test(object.reg(), Immediate(kSmiTagMask));
- leave.Branch(zero, taken);
- // It is a heap object - get map.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- // if (!object->IsJSValue()) return object.
- __ CmpObjectType(object.reg(), JS_VALUE_TYPE, temp.reg());
- leave.Branch(not_equal, not_taken);
- __ mov(temp.reg(), FieldOperand(object.reg(), JSValue::kValueOffset));
- object.Unuse();
- frame_->SetElementAt(0, &temp);
- leave.Bind();
-}
-
-
-void CodeGenerator::GenerateSetValueOf(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
- JumpTarget leave;
- Load(args->at(0)); // Load the object.
- Load(args->at(1)); // Load the value.
- Result value = frame_->Pop();
- Result object = frame_->Pop();
- value.ToRegister();
- object.ToRegister();
-
- // if (object->IsSmi()) return value.
- __ test(object.reg(), Immediate(kSmiTagMask));
- leave.Branch(zero, &value, taken);
-
- // It is a heap object - get its map.
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_valid());
- // if (!object->IsJSValue()) return value.
- __ CmpObjectType(object.reg(), JS_VALUE_TYPE, scratch.reg());
- leave.Branch(not_equal, &value, not_taken);
-
- // Store the value.
- __ mov(FieldOperand(object.reg(), JSValue::kValueOffset), value.reg());
- // Update the write barrier. Save the value as it will be
- // overwritten by the write barrier code and is needed afterward.
- Result duplicate_value = allocator_->Allocate();
- ASSERT(duplicate_value.is_valid());
- __ mov(duplicate_value.reg(), value.reg());
- // The object register is also overwritten by the write barrier and
- // possibly aliased in the frame.
- frame_->Spill(object.reg());
- __ RecordWrite(object.reg(), JSValue::kValueOffset, duplicate_value.reg(),
- scratch.reg());
- object.Unuse();
- scratch.Unuse();
- duplicate_value.Unuse();
-
- // Leave.
- leave.Bind(&value);
- frame_->Push(&value);
-}
-
-
-void CodeGenerator::GenerateArguments(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
-
- // ArgumentsAccessStub expects the key in edx and the formal
- // parameter count in eax.
- Load(args->at(0));
- Result key = frame_->Pop();
- // Explicitly create a constant result.
- Result count(Handle<Smi>(Smi::FromInt(scope()->num_parameters())));
- // Call the shared stub to get to arguments[key].
- ArgumentsAccessStub stub(ArgumentsAccessStub::READ_ELEMENT);
- Result result = frame_->CallStub(&stub, &key, &count);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
-
- // Load the two objects into registers and perform the comparison.
- Load(args->at(0));
- Load(args->at(1));
- Result right = frame_->Pop();
- Result left = frame_->Pop();
- right.ToRegister();
- left.ToRegister();
- __ cmp(right.reg(), Operand(left.reg()));
- right.Unuse();
- left.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateGetFramePointer(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
- STATIC_ASSERT(kSmiTag == 0); // EBP value is aligned, so it looks like a Smi.
- Result ebp_as_smi = allocator_->Allocate();
- ASSERT(ebp_as_smi.is_valid());
- __ mov(ebp_as_smi.reg(), Operand(ebp));
- frame_->Push(&ebp_as_smi);
-}
-
-
-void CodeGenerator::GenerateRandomHeapNumber(
- ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
- frame_->SpillAll();
-
- Label slow_allocate_heapnumber;
- Label heapnumber_allocated;
-
- __ AllocateHeapNumber(edi, ebx, ecx, &slow_allocate_heapnumber);
- __ jmp(&heapnumber_allocated);
-
- __ bind(&slow_allocate_heapnumber);
- // Allocate a heap number.
- __ CallRuntime(Runtime::kNumberAlloc, 0);
- __ mov(edi, eax);
-
- __ bind(&heapnumber_allocated);
-
- __ PrepareCallCFunction(1, ebx);
- __ mov(Operand(esp, 0), Immediate(ExternalReference::isolate_address()));
- __ CallCFunction(ExternalReference::random_uint32_function(masm()->isolate()),
- 1);
-
- // Convert 32 random bits in eax to 0.(32 random bits) in a double
- // by computing:
- // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
- // This is implemented on both SSE2 and FPU.
- if (CpuFeatures::IsSupported(SSE2)) {
- CpuFeatures::Scope fscope(SSE2);
- __ mov(ebx, Immediate(0x49800000)); // 1.0 x 2^20 as single.
- __ movd(xmm1, Operand(ebx));
- __ movd(xmm0, Operand(eax));
- __ cvtss2sd(xmm1, xmm1);
- __ pxor(xmm0, xmm1);
- __ subsd(xmm0, xmm1);
- __ movdbl(FieldOperand(edi, HeapNumber::kValueOffset), xmm0);
- } else {
- // 0x4130000000000000 is 1.0 x 2^20 as a double.
- __ mov(FieldOperand(edi, HeapNumber::kExponentOffset),
- Immediate(0x41300000));
- __ mov(FieldOperand(edi, HeapNumber::kMantissaOffset), eax);
- __ fld_d(FieldOperand(edi, HeapNumber::kValueOffset));
- __ mov(FieldOperand(edi, HeapNumber::kMantissaOffset), Immediate(0));
- __ fld_d(FieldOperand(edi, HeapNumber::kValueOffset));
- __ fsubp(1);
- __ fstp_d(FieldOperand(edi, HeapNumber::kValueOffset));
- }
- __ mov(eax, edi);
-
- Result result = allocator_->Allocate(eax);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateStringAdd(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
-
- StringAddStub stub(NO_STRING_ADD_FLAGS);
- Result answer = frame_->CallStub(&stub, 2);
- frame_->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateSubString(ZoneList<Expression*>* args) {
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
-
- SubStringStub stub;
- Result answer = frame_->CallStub(&stub, 3);
- frame_->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateStringCompare(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
-
- StringCompareStub stub;
- Result answer = frame_->CallStub(&stub, 2);
- frame_->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) {
- ASSERT_EQ(4, args->length());
-
- // Load the arguments on the stack and call the stub.
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
- Load(args->at(3));
-
- RegExpExecStub stub;
- Result result = frame_->CallStub(&stub, 4);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateRegExpConstructResult(ZoneList<Expression*>* args) {
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0)); // Size of array, smi.
- Load(args->at(1)); // "index" property value.
- Load(args->at(2)); // "input" property value.
-
- RegExpConstructResultStub stub;
- Result result = frame_->CallStub(&stub, 3);
- frame_->Push(&result);
-}
-
-
-class DeferredSearchCache: public DeferredCode {
- public:
- DeferredSearchCache(Register dst, Register cache, Register key)
- : dst_(dst), cache_(cache), key_(key) {
- set_comment("[ DeferredSearchCache");
- }
-
- virtual void Generate();
-
- private:
- Register dst_; // on invocation Smi index of finger, on exit
- // holds value being looked up.
- Register cache_; // instance of JSFunctionResultCache.
- Register key_; // key being looked up.
-};
-
-
-void DeferredSearchCache::Generate() {
- Label first_loop, search_further, second_loop, cache_miss;
-
- // Smi-tagging is equivalent to multiplying by 2.
- STATIC_ASSERT(kSmiTag == 0);
- STATIC_ASSERT(kSmiTagSize == 1);
-
- Smi* kEntrySizeSmi = Smi::FromInt(JSFunctionResultCache::kEntrySize);
- Smi* kEntriesIndexSmi = Smi::FromInt(JSFunctionResultCache::kEntriesIndex);
-
- // Check the cache from finger to start of the cache.
- __ bind(&first_loop);
- __ sub(Operand(dst_), Immediate(kEntrySizeSmi));
- __ cmp(Operand(dst_), Immediate(kEntriesIndexSmi));
- __ j(less, &search_further);
-
- __ cmp(key_, CodeGenerator::FixedArrayElementOperand(cache_, dst_));
- __ j(not_equal, &first_loop);
-
- __ mov(FieldOperand(cache_, JSFunctionResultCache::kFingerOffset), dst_);
- __ mov(dst_, CodeGenerator::FixedArrayElementOperand(cache_, dst_, 1));
- __ jmp(exit_label());
-
- __ bind(&search_further);
-
- // Check the cache from end of cache up to finger.
- __ mov(dst_, FieldOperand(cache_, JSFunctionResultCache::kCacheSizeOffset));
-
- __ bind(&second_loop);
- __ sub(Operand(dst_), Immediate(kEntrySizeSmi));
- // Consider prefetching into some reg.
- __ cmp(dst_, FieldOperand(cache_, JSFunctionResultCache::kFingerOffset));
- __ j(less_equal, &cache_miss);
-
- __ cmp(key_, CodeGenerator::FixedArrayElementOperand(cache_, dst_));
- __ j(not_equal, &second_loop);
-
- __ mov(FieldOperand(cache_, JSFunctionResultCache::kFingerOffset), dst_);
- __ mov(dst_, CodeGenerator::FixedArrayElementOperand(cache_, dst_, 1));
- __ jmp(exit_label());
-
- __ bind(&cache_miss);
- __ push(cache_); // store a reference to cache
- __ push(key_); // store a key
- __ push(Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
- __ push(key_);
- // On ia32 function must be in edi.
- __ mov(edi, FieldOperand(cache_, JSFunctionResultCache::kFactoryOffset));
- ParameterCount expected(1);
- __ InvokeFunction(edi, expected, CALL_FUNCTION);
-
- // Find a place to put new cached value into.
- Label add_new_entry, update_cache;
- __ mov(ecx, Operand(esp, kPointerSize)); // restore the cache
- // Possible optimization: cache size is constant for the given cache
- // so technically we could use a constant here. However, if we have
- // cache miss this optimization would hardly matter much.
-
- // Check if we could add new entry to cache.
- __ mov(ebx, FieldOperand(ecx, FixedArray::kLengthOffset));
- __ cmp(ebx, FieldOperand(ecx, JSFunctionResultCache::kCacheSizeOffset));
- __ j(greater, &add_new_entry);
-
- // Check if we could evict entry after finger.
- __ mov(edx, FieldOperand(ecx, JSFunctionResultCache::kFingerOffset));
- __ add(Operand(edx), Immediate(kEntrySizeSmi));
- __ cmp(ebx, Operand(edx));
- __ j(greater, &update_cache);
-
- // Need to wrap over the cache.
- __ mov(edx, Immediate(kEntriesIndexSmi));
- __ jmp(&update_cache);
-
- __ bind(&add_new_entry);
- __ mov(edx, FieldOperand(ecx, JSFunctionResultCache::kCacheSizeOffset));
- __ lea(ebx, Operand(edx, JSFunctionResultCache::kEntrySize << 1));
- __ mov(FieldOperand(ecx, JSFunctionResultCache::kCacheSizeOffset), ebx);
-
- // Update the cache itself.
- // edx holds the index.
- __ bind(&update_cache);
- __ pop(ebx); // restore the key
- __ mov(FieldOperand(ecx, JSFunctionResultCache::kFingerOffset), edx);
- // Store key.
- __ mov(CodeGenerator::FixedArrayElementOperand(ecx, edx), ebx);
- __ RecordWrite(ecx, 0, ebx, edx);
-
- // Store value.
- __ pop(ecx); // restore the cache.
- __ mov(edx, FieldOperand(ecx, JSFunctionResultCache::kFingerOffset));
- __ add(Operand(edx), Immediate(Smi::FromInt(1)));
- __ mov(ebx, eax);
- __ mov(CodeGenerator::FixedArrayElementOperand(ecx, edx), ebx);
- __ RecordWrite(ecx, 0, ebx, edx);
-
- if (!dst_.is(eax)) {
- __ mov(dst_, eax);
- }
-}
-
-
-void CodeGenerator::GenerateGetFromCache(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- ASSERT_NE(NULL, args->at(0)->AsLiteral());
- int cache_id = Smi::cast(*(args->at(0)->AsLiteral()->handle()))->value();
-
- Handle<FixedArray> jsfunction_result_caches(
- masm()->isolate()->global_context()->jsfunction_result_caches());
- if (jsfunction_result_caches->length() <= cache_id) {
- __ Abort("Attempt to use undefined cache.");
- frame_->Push(FACTORY->undefined_value());
- return;
- }
-
- Load(args->at(1));
- Result key = frame_->Pop();
- key.ToRegister();
-
- Result cache = allocator()->Allocate();
- ASSERT(cache.is_valid());
- __ mov(cache.reg(), ContextOperand(esi, Context::GLOBAL_INDEX));
- __ mov(cache.reg(),
- FieldOperand(cache.reg(), GlobalObject::kGlobalContextOffset));
- __ mov(cache.reg(),
- ContextOperand(cache.reg(), Context::JSFUNCTION_RESULT_CACHES_INDEX));
- __ mov(cache.reg(),
- FieldOperand(cache.reg(), FixedArray::OffsetOfElementAt(cache_id)));
-
- Result tmp = allocator()->Allocate();
- ASSERT(tmp.is_valid());
-
- DeferredSearchCache* deferred = new DeferredSearchCache(tmp.reg(),
- cache.reg(),
- key.reg());
-
- // tmp.reg() now holds finger offset as a smi.
- STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
- __ mov(tmp.reg(), FieldOperand(cache.reg(),
- JSFunctionResultCache::kFingerOffset));
- __ cmp(key.reg(), FixedArrayElementOperand(cache.reg(), tmp.reg()));
- deferred->Branch(not_equal);
-
- __ mov(tmp.reg(), FixedArrayElementOperand(cache.reg(), tmp.reg(), 1));
-
- deferred->BindExit();
- frame_->Push(&tmp);
-}
-
-
-void CodeGenerator::GenerateNumberToString(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
-
- // Load the argument on the stack and call the stub.
- Load(args->at(0));
- NumberToStringStub stub;
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-class DeferredSwapElements: public DeferredCode {
- public:
- DeferredSwapElements(Register object, Register index1, Register index2)
- : object_(object), index1_(index1), index2_(index2) {
- set_comment("[ DeferredSwapElements");
- }
-
- virtual void Generate();
-
- private:
- Register object_, index1_, index2_;
-};
-
-
-void DeferredSwapElements::Generate() {
- __ push(object_);
- __ push(index1_);
- __ push(index2_);
- __ CallRuntime(Runtime::kSwapElements, 3);
-}
-
-
-void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
- // Note: this code assumes that indices are passed are within
- // elements' bounds and refer to valid (not holes) values.
- Comment cmnt(masm_, "[ GenerateSwapElements");
-
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
-
- Result index2 = frame_->Pop();
- index2.ToRegister();
-
- Result index1 = frame_->Pop();
- index1.ToRegister();
-
- Result object = frame_->Pop();
- object.ToRegister();
-
- Result tmp1 = allocator()->Allocate();
- tmp1.ToRegister();
- Result tmp2 = allocator()->Allocate();
- tmp2.ToRegister();
-
- frame_->Spill(object.reg());
- frame_->Spill(index1.reg());
- frame_->Spill(index2.reg());
-
- DeferredSwapElements* deferred = new DeferredSwapElements(object.reg(),
- index1.reg(),
- index2.reg());
-
- // Fetch the map and check if array is in fast case.
- // Check that object doesn't require security checks and
- // has no indexed interceptor.
- __ CmpObjectType(object.reg(), FIRST_JS_OBJECT_TYPE, tmp1.reg());
- deferred->Branch(below);
- __ test_b(FieldOperand(tmp1.reg(), Map::kBitFieldOffset),
- KeyedLoadIC::kSlowCaseBitFieldMask);
- deferred->Branch(not_zero);
-
- // Check the object's elements are in fast case and writable.
- __ mov(tmp1.reg(), FieldOperand(object.reg(), JSObject::kElementsOffset));
- __ cmp(FieldOperand(tmp1.reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->fixed_array_map()));
- deferred->Branch(not_equal);
-
- // Smi-tagging is equivalent to multiplying by 2.
- STATIC_ASSERT(kSmiTag == 0);
- STATIC_ASSERT(kSmiTagSize == 1);
-
- // Check that both indices are smis.
- __ mov(tmp2.reg(), index1.reg());
- __ or_(tmp2.reg(), Operand(index2.reg()));
- __ test(tmp2.reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
-
- // Check that both indices are valid.
- __ mov(tmp2.reg(), FieldOperand(object.reg(), JSArray::kLengthOffset));
- __ cmp(tmp2.reg(), Operand(index1.reg()));
- deferred->Branch(below_equal);
- __ cmp(tmp2.reg(), Operand(index2.reg()));
- deferred->Branch(below_equal);
-
- // Bring addresses into index1 and index2.
- __ lea(index1.reg(), FixedArrayElementOperand(tmp1.reg(), index1.reg()));
- __ lea(index2.reg(), FixedArrayElementOperand(tmp1.reg(), index2.reg()));
-
- // Swap elements.
- __ mov(object.reg(), Operand(index1.reg(), 0));
- __ mov(tmp2.reg(), Operand(index2.reg(), 0));
- __ mov(Operand(index2.reg(), 0), object.reg());
- __ mov(Operand(index1.reg(), 0), tmp2.reg());
-
- Label done;
- __ InNewSpace(tmp1.reg(), tmp2.reg(), equal, &done);
- // Possible optimization: do a check that both values are Smis
- // (or them and test against Smi mask.)
-
- __ mov(tmp2.reg(), tmp1.reg());
- __ RecordWriteHelper(tmp2.reg(), index1.reg(), object.reg());
- __ RecordWriteHelper(tmp1.reg(), index2.reg(), object.reg());
- __ bind(&done);
-
- deferred->BindExit();
- frame_->Push(FACTORY->undefined_value());
-}
-
-
-void CodeGenerator::GenerateCallFunction(ZoneList<Expression*>* args) {
- Comment cmnt(masm_, "[ GenerateCallFunction");
-
- ASSERT(args->length() >= 2);
-
- int n_args = args->length() - 2; // for receiver and function.
- Load(args->at(0)); // receiver
- for (int i = 0; i < n_args; i++) {
- Load(args->at(i + 1));
- }
- Load(args->at(n_args + 1)); // function
- Result result = frame_->CallJSFunction(n_args);
- frame_->Push(&result);
-}
-
-
-// Generates the Math.pow method. Only handles special cases and
-// branches to the runtime system for everything else. Please note
-// that this function assumes that the callsite has executed ToNumber
-// on both arguments.
-void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
- Load(args->at(0));
- Load(args->at(1));
- if (!CpuFeatures::IsSupported(SSE2)) {
- Result res = frame_->CallRuntime(Runtime::kMath_pow, 2);
- frame_->Push(&res);
- } else {
- CpuFeatures::Scope use_sse2(SSE2);
- Label allocate_return;
- // Load the two operands while leaving the values on the frame.
- frame()->Dup();
- Result exponent = frame()->Pop();
- exponent.ToRegister();
- frame()->Spill(exponent.reg());
- frame()->PushElementAt(1);
- Result base = frame()->Pop();
- base.ToRegister();
- frame()->Spill(base.reg());
-
- Result answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- ASSERT(!exponent.reg().is(base.reg()));
- JumpTarget call_runtime;
-
- // Save 1 in xmm3 - we need this several times later on.
- __ mov(answer.reg(), Immediate(1));
- __ cvtsi2sd(xmm3, Operand(answer.reg()));
-
- Label exponent_nonsmi;
- Label base_nonsmi;
- // If the exponent is a heap number go to that specific case.
- __ test(exponent.reg(), Immediate(kSmiTagMask));
- __ j(not_zero, &exponent_nonsmi);
- __ test(base.reg(), Immediate(kSmiTagMask));
- __ j(not_zero, &base_nonsmi);
-
- // Optimized version when y is an integer.
- Label powi;
- __ SmiUntag(base.reg());
- __ cvtsi2sd(xmm0, Operand(base.reg()));
- __ jmp(&powi);
- // exponent is smi and base is a heapnumber.
- __ bind(&base_nonsmi);
- __ cmp(FieldOperand(base.reg(), HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- call_runtime.Branch(not_equal);
-
- __ movdbl(xmm0, FieldOperand(base.reg(), HeapNumber::kValueOffset));
-
- // Optimized version of pow if y is an integer.
- __ bind(&powi);
- __ SmiUntag(exponent.reg());
-
- // Save exponent in base as we need to check if exponent is negative later.
- // We know that base and exponent are in different registers.
- __ mov(base.reg(), exponent.reg());
-
- // Get absolute value of exponent.
- Label no_neg;
- __ cmp(exponent.reg(), 0);
- __ j(greater_equal, &no_neg);
- __ neg(exponent.reg());
- __ bind(&no_neg);
-
- // Load xmm1 with 1.
- __ movsd(xmm1, xmm3);
- Label while_true;
- Label no_multiply;
-
- __ bind(&while_true);
- __ shr(exponent.reg(), 1);
- __ j(not_carry, &no_multiply);
- __ mulsd(xmm1, xmm0);
- __ bind(&no_multiply);
- __ test(exponent.reg(), Operand(exponent.reg()));
- __ mulsd(xmm0, xmm0);
- __ j(not_zero, &while_true);
-
- // x has the original value of y - if y is negative return 1/result.
- __ test(base.reg(), Operand(base.reg()));
- __ j(positive, &allocate_return);
- // Special case if xmm1 has reached infinity.
- __ mov(answer.reg(), Immediate(0x7FB00000));
- __ movd(xmm0, Operand(answer.reg()));
- __ cvtss2sd(xmm0, xmm0);
- __ ucomisd(xmm0, xmm1);
- call_runtime.Branch(equal);
- __ divsd(xmm3, xmm1);
- __ movsd(xmm1, xmm3);
- __ jmp(&allocate_return);
-
- // exponent (or both) is a heapnumber - no matter what we should now work
- // on doubles.
- __ bind(&exponent_nonsmi);
- __ cmp(FieldOperand(exponent.reg(), HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- call_runtime.Branch(not_equal);
- __ movdbl(xmm1, FieldOperand(exponent.reg(), HeapNumber::kValueOffset));
- // Test if exponent is nan.
- __ ucomisd(xmm1, xmm1);
- call_runtime.Branch(parity_even);
-
- Label base_not_smi;
- Label handle_special_cases;
- __ test(base.reg(), Immediate(kSmiTagMask));
- __ j(not_zero, &base_not_smi);
- __ SmiUntag(base.reg());
- __ cvtsi2sd(xmm0, Operand(base.reg()));
- __ jmp(&handle_special_cases);
- __ bind(&base_not_smi);
- __ cmp(FieldOperand(base.reg(), HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- call_runtime.Branch(not_equal);
- __ mov(answer.reg(), FieldOperand(base.reg(), HeapNumber::kExponentOffset));
- __ and_(answer.reg(), HeapNumber::kExponentMask);
- __ cmp(Operand(answer.reg()), Immediate(HeapNumber::kExponentMask));
- // base is NaN or +/-Infinity
- call_runtime.Branch(greater_equal);
- __ movdbl(xmm0, FieldOperand(base.reg(), HeapNumber::kValueOffset));
-
- // base is in xmm0 and exponent is in xmm1.
- __ bind(&handle_special_cases);
- Label not_minus_half;
- // Test for -0.5.
- // Load xmm2 with -0.5.
- __ mov(answer.reg(), Immediate(0xBF000000));
- __ movd(xmm2, Operand(answer.reg()));
- __ cvtss2sd(xmm2, xmm2);
- // xmm2 now has -0.5.
- __ ucomisd(xmm2, xmm1);
- __ j(not_equal, ¬_minus_half);
-
- // Calculates reciprocal of square root.
- // sqrtsd returns -0 when input is -0. ECMA spec requires +0.
- __ xorpd(xmm1, xmm1);
- __ addsd(xmm1, xmm0);
- __ sqrtsd(xmm1, xmm1);
- __ divsd(xmm3, xmm1);
- __ movsd(xmm1, xmm3);
- __ jmp(&allocate_return);
-
- // Test for 0.5.
- __ bind(¬_minus_half);
- // Load xmm2 with 0.5.
- // Since xmm3 is 1 and xmm2 is -0.5 this is simply xmm2 + xmm3.
- __ addsd(xmm2, xmm3);
- // xmm2 now has 0.5.
- __ ucomisd(xmm2, xmm1);
- call_runtime.Branch(not_equal);
- // Calculates square root.
- // sqrtsd returns -0 when input is -0. ECMA spec requires +0.
- __ xorpd(xmm1, xmm1);
- __ addsd(xmm1, xmm0);
- __ sqrtsd(xmm1, xmm1);
-
- JumpTarget done;
- Label failure, success;
- __ bind(&allocate_return);
- // Make a copy of the frame to enable us to handle allocation
- // failure after the JumpTarget jump.
- VirtualFrame* clone = new VirtualFrame(frame());
- __ AllocateHeapNumber(answer.reg(), exponent.reg(),
- base.reg(), &failure);
- __ movdbl(FieldOperand(answer.reg(), HeapNumber::kValueOffset), xmm1);
- // Remove the two original values from the frame - we only need those
- // in the case where we branch to runtime.
- frame()->Drop(2);
- exponent.Unuse();
- base.Unuse();
- done.Jump(&answer);
- // Use the copy of the original frame as our current frame.
- RegisterFile empty_regs;
- SetFrame(clone, &empty_regs);
- // If we experience an allocation failure we branch to runtime.
- __ bind(&failure);
- call_runtime.Bind();
- answer = frame()->CallRuntime(Runtime::kMath_pow_cfunction, 2);
-
- done.Bind(&answer);
- frame()->Push(&answer);
- }
-}
-
-
-void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- TranscendentalCacheStub stub(TranscendentalCache::SIN,
- TranscendentalCacheStub::TAGGED);
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- TranscendentalCacheStub stub(TranscendentalCache::COS,
- TranscendentalCacheStub::TAGGED);
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateMathLog(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- TranscendentalCacheStub stub(TranscendentalCache::LOG,
- TranscendentalCacheStub::TAGGED);
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-// Generates the Math.sqrt method. Please note - this function assumes that
-// the callsite has executed ToNumber on the argument.
-void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
-
- if (!CpuFeatures::IsSupported(SSE2)) {
- Result result = frame()->CallRuntime(Runtime::kMath_sqrt, 1);
- frame()->Push(&result);
- } else {
- CpuFeatures::Scope use_sse2(SSE2);
- // Leave original value on the frame if we need to call runtime.
- frame()->Dup();
- Result result = frame()->Pop();
- result.ToRegister();
- frame()->Spill(result.reg());
- Label runtime;
- Label non_smi;
- Label load_done;
- JumpTarget end;
-
- __ test(result.reg(), Immediate(kSmiTagMask));
- __ j(not_zero, &non_smi);
- __ SmiUntag(result.reg());
- __ cvtsi2sd(xmm0, Operand(result.reg()));
- __ jmp(&load_done);
- __ bind(&non_smi);
- __ cmp(FieldOperand(result.reg(), HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- __ j(not_equal, &runtime);
- __ movdbl(xmm0, FieldOperand(result.reg(), HeapNumber::kValueOffset));
-
- __ bind(&load_done);
- __ sqrtsd(xmm0, xmm0);
- // A copy of the virtual frame to allow us to go to runtime after the
- // JumpTarget jump.
- Result scratch = allocator()->Allocate();
- VirtualFrame* clone = new VirtualFrame(frame());
- __ AllocateHeapNumber(result.reg(), scratch.reg(), no_reg, &runtime);
-
- __ movdbl(FieldOperand(result.reg(), HeapNumber::kValueOffset), xmm0);
- frame()->Drop(1);
- scratch.Unuse();
- end.Jump(&result);
- // We only branch to runtime if we have an allocation error.
- // Use the copy of the original frame as our current frame.
- RegisterFile empty_regs;
- SetFrame(clone, &empty_regs);
- __ bind(&runtime);
- result = frame()->CallRuntime(Runtime::kMath_sqrt, 1);
-
- end.Bind(&result);
- frame()->Push(&result);
- }
-}
-
-
-void CodeGenerator::GenerateIsRegExpEquivalent(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
- Load(args->at(0));
- Load(args->at(1));
- Result right_res = frame_->Pop();
- Result left_res = frame_->Pop();
- right_res.ToRegister();
- left_res.ToRegister();
- Result tmp_res = allocator()->Allocate();
- ASSERT(tmp_res.is_valid());
- Register right = right_res.reg();
- Register left = left_res.reg();
- Register tmp = tmp_res.reg();
- right_res.Unuse();
- left_res.Unuse();
- tmp_res.Unuse();
- __ cmp(left, Operand(right));
- destination()->true_target()->Branch(equal);
- // Fail if either is a non-HeapObject.
- __ mov(tmp, left);
- __ and_(Operand(tmp), right);
- __ test(Operand(tmp), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(equal);
- __ CmpObjectType(left, JS_REGEXP_TYPE, tmp);
- destination()->false_target()->Branch(not_equal);
- __ cmp(tmp, FieldOperand(right, HeapObject::kMapOffset));
- destination()->false_target()->Branch(not_equal);
- __ mov(tmp, FieldOperand(left, JSRegExp::kDataOffset));
- __ cmp(tmp, FieldOperand(right, JSRegExp::kDataOffset));
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateHasCachedArrayIndex(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- if (FLAG_debug_code) {
- __ AbortIfNotString(value.reg());
- }
-
- __ test(FieldOperand(value.reg(), String::kHashFieldOffset),
- Immediate(String::kContainsCachedArrayIndexMask));
-
- value.Unuse();
- destination()->Split(zero);
-}
-
-
-void CodeGenerator::GenerateGetCachedArrayIndex(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result string = frame_->Pop();
- string.ToRegister();
- if (FLAG_debug_code) {
- __ AbortIfNotString(string.reg());
- }
-
- Result number = allocator()->Allocate();
- ASSERT(number.is_valid());
- __ mov(number.reg(), FieldOperand(string.reg(), String::kHashFieldOffset));
- __ IndexFromHash(number.reg(), number.reg());
- string.Unuse();
- frame_->Push(&number);
-}
-
-
-void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
- ASSERT(!in_safe_int32_mode());
- if (CheckForInlineRuntimeCall(node)) {
- return;
- }
-
- ZoneList<Expression*>* args = node->arguments();
- Comment cmnt(masm_, "[ CallRuntime");
- const Runtime::Function* function = node->function();
-
- if (function == NULL) {
- // Push the builtins object found in the current global object.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), GlobalObjectOperand());
- __ mov(temp.reg(), FieldOperand(temp.reg(), GlobalObject::kBuiltinsOffset));
- frame_->Push(&temp);
- }
-
- // Push the arguments ("left-to-right").
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- if (function == NULL) {
- // Call the JS runtime function.
- frame_->Push(node->name());
- Result answer = frame_->CallCallIC(RelocInfo::CODE_TARGET,
- arg_count,
- loop_nesting_);
- frame_->RestoreContextRegister();
- frame_->Push(&answer);
- } else {
- // Call the C runtime function.
- Result answer = frame_->CallRuntime(function, arg_count);
- frame_->Push(&answer);
- }
-}
-
-
-void CodeGenerator::VisitUnaryOperation(UnaryOperation* node) {
- Comment cmnt(masm_, "[ UnaryOperation");
-
- Token::Value op = node->op();
-
- if (op == Token::NOT) {
- // Swap the true and false targets but keep the same actual label
- // as the fall through.
- destination()->Invert();
- LoadCondition(node->expression(), destination(), true);
- // Swap the labels back.
- destination()->Invert();
-
- } else if (op == Token::DELETE) {
- Property* property = node->expression()->AsProperty();
- if (property != NULL) {
- Load(property->obj());
- Load(property->key());
- frame_->Push(Smi::FromInt(strict_mode_flag()));
- Result answer = frame_->InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION, 3);
- frame_->Push(&answer);
- return;
- }
-
- Variable* variable = node->expression()->AsVariableProxy()->AsVariable();
- if (variable != NULL) {
- // Delete of an unqualified identifier is disallowed in strict mode
- // but "delete this" is.
- ASSERT(strict_mode_flag() == kNonStrictMode || variable->is_this());
- Slot* slot = variable->AsSlot();
- if (variable->is_global()) {
- LoadGlobal();
- frame_->Push(variable->name());
- frame_->Push(Smi::FromInt(kNonStrictMode));
- Result answer = frame_->InvokeBuiltin(Builtins::DELETE,
- CALL_FUNCTION, 3);
- frame_->Push(&answer);
-
- } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
- // Call the runtime to delete from the context holding the named
- // variable. Sync the virtual frame eagerly so we can push the
- // arguments directly into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(esi);
- frame_->EmitPush(Immediate(variable->name()));
- Result answer = frame_->CallRuntime(Runtime::kDeleteContextSlot, 2);
- frame_->Push(&answer);
- } else {
- // Default: Result of deleting non-global, not dynamically
- // introduced variables is false.
- frame_->Push(FACTORY->false_value());
- }
- } else {
- // Default: Result of deleting expressions is true.
- Load(node->expression()); // may have side-effects
- frame_->SetElementAt(0, FACTORY->true_value());
- }
-
- } else if (op == Token::TYPEOF) {
- // Special case for loading the typeof expression; see comment on
- // LoadTypeofExpression().
- LoadTypeofExpression(node->expression());
- Result answer = frame_->CallRuntime(Runtime::kTypeof, 1);
- frame_->Push(&answer);
-
- } else if (op == Token::VOID) {
- Expression* expression = node->expression();
- if (expression && expression->AsLiteral() && (
- expression->AsLiteral()->IsTrue() ||
- expression->AsLiteral()->IsFalse() ||
- expression->AsLiteral()->handle()->IsNumber() ||
- expression->AsLiteral()->handle()->IsString() ||
- expression->AsLiteral()->handle()->IsJSRegExp() ||
- expression->AsLiteral()->IsNull())) {
- // Omit evaluating the value of the primitive literal.
- // It will be discarded anyway, and can have no side effect.
- frame_->Push(FACTORY->undefined_value());
- } else {
- Load(node->expression());
- frame_->SetElementAt(0, FACTORY->undefined_value());
- }
-
- } else {
- if (in_safe_int32_mode()) {
- Visit(node->expression());
- Result value = frame_->Pop();
- ASSERT(value.is_untagged_int32());
- // Registers containing an int32 value are not multiply used.
- ASSERT(!value.is_register() || !frame_->is_used(value.reg()));
- value.ToRegister();
- switch (op) {
- case Token::SUB: {
- __ neg(value.reg());
- frame_->Push(&value);
- if (node->no_negative_zero()) {
- // -MIN_INT is MIN_INT with the overflow flag set.
- unsafe_bailout_->Branch(overflow);
- } else {
- // MIN_INT and 0 both have bad negations. They both have 31 zeros.
- __ test(value.reg(), Immediate(0x7FFFFFFF));
- unsafe_bailout_->Branch(zero);
- }
- break;
- }
- case Token::BIT_NOT: {
- __ not_(value.reg());
- frame_->Push(&value);
- break;
- }
- case Token::ADD: {
- // Unary plus has no effect on int32 values.
- frame_->Push(&value);
- break;
- }
- default:
- UNREACHABLE();
- break;
- }
- } else {
- Load(node->expression());
- bool can_overwrite = node->expression()->ResultOverwriteAllowed();
- UnaryOverwriteMode overwrite =
- can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
- bool no_negative_zero = node->expression()->no_negative_zero();
- switch (op) {
- case Token::NOT:
- case Token::DELETE:
- case Token::TYPEOF:
- UNREACHABLE(); // handled above
- break;
-
- case Token::SUB: {
- GenericUnaryOpStub stub(
- Token::SUB,
- overwrite,
- NO_UNARY_FLAGS,
- no_negative_zero ? kIgnoreNegativeZero : kStrictNegativeZero);
- Result operand = frame_->Pop();
- Result answer = frame_->CallStub(&stub, &operand);
- answer.set_type_info(TypeInfo::Number());
- frame_->Push(&answer);
- break;
- }
- case Token::BIT_NOT: {
- // Smi check.
- JumpTarget smi_label;
- JumpTarget continue_label;
- Result operand = frame_->Pop();
- TypeInfo operand_info = operand.type_info();
- operand.ToRegister();
- if (operand_info.IsSmi()) {
- if (FLAG_debug_code) __ AbortIfNotSmi(operand.reg());
- frame_->Spill(operand.reg());
- // Set smi tag bit. It will be reset by the not operation.
- __ lea(operand.reg(), Operand(operand.reg(), kSmiTagMask));
- __ not_(operand.reg());
- Result answer = operand;
- answer.set_type_info(TypeInfo::Smi());
- frame_->Push(&answer);
- } else {
- __ test(operand.reg(), Immediate(kSmiTagMask));
- smi_label.Branch(zero, &operand, taken);
-
- GenericUnaryOpStub stub(Token::BIT_NOT,
- overwrite,
- NO_UNARY_SMI_CODE_IN_STUB);
- Result answer = frame_->CallStub(&stub, &operand);
- continue_label.Jump(&answer);
-
- smi_label.Bind(&answer);
- answer.ToRegister();
- frame_->Spill(answer.reg());
- // Set smi tag bit. It will be reset by the not operation.
- __ lea(answer.reg(), Operand(answer.reg(), kSmiTagMask));
- __ not_(answer.reg());
-
- continue_label.Bind(&answer);
- answer.set_type_info(TypeInfo::Integer32());
- frame_->Push(&answer);
- }
- break;
- }
- case Token::ADD: {
- // Smi check.
- JumpTarget continue_label;
- Result operand = frame_->Pop();
- TypeInfo operand_info = operand.type_info();
- operand.ToRegister();
- __ test(operand.reg(), Immediate(kSmiTagMask));
- continue_label.Branch(zero, &operand, taken);
-
- frame_->Push(&operand);
- Result answer = frame_->InvokeBuiltin(Builtins::TO_NUMBER,
- CALL_FUNCTION, 1);
-
- continue_label.Bind(&answer);
- if (operand_info.IsSmi()) {
- answer.set_type_info(TypeInfo::Smi());
- } else if (operand_info.IsInteger32()) {
- answer.set_type_info(TypeInfo::Integer32());
- } else {
- answer.set_type_info(TypeInfo::Number());
- }
- frame_->Push(&answer);
- break;
- }
- default:
- UNREACHABLE();
- }
- }
- }
-}
-
-
-// The value in dst was optimistically incremented or decremented. The
-// result overflowed or was not smi tagged. Undo the operation, call
-// into the runtime to convert the argument to a number, and call the
-// specialized add or subtract stub. The result is left in dst.
-class DeferredPrefixCountOperation: public DeferredCode {
- public:
- DeferredPrefixCountOperation(Register dst,
- bool is_increment,
- TypeInfo input_type)
- : dst_(dst), is_increment_(is_increment), input_type_(input_type) {
- set_comment("[ DeferredCountOperation");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- bool is_increment_;
- TypeInfo input_type_;
-};
-
-
-void DeferredPrefixCountOperation::Generate() {
- // Undo the optimistic smi operation.
- if (is_increment_) {
- __ sub(Operand(dst_), Immediate(Smi::FromInt(1)));
- } else {
- __ add(Operand(dst_), Immediate(Smi::FromInt(1)));
- }
- Register left;
- if (input_type_.IsNumber()) {
- left = dst_;
- } else {
- __ push(dst_);
- __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
- left = eax;
- }
-
- GenericBinaryOpStub stub(is_increment_ ? Token::ADD : Token::SUB,
- NO_OVERWRITE,
- NO_GENERIC_BINARY_FLAGS,
- TypeInfo::Number());
- stub.GenerateCall(masm_, left, Smi::FromInt(1));
-
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-// The value in dst was optimistically incremented or decremented. The
-// result overflowed or was not smi tagged. Undo the operation and call
-// into the runtime to convert the argument to a number. Update the
-// original value in old. Call the specialized add or subtract stub.
-// The result is left in dst.
-class DeferredPostfixCountOperation: public DeferredCode {
- public:
- DeferredPostfixCountOperation(Register dst,
- Register old,
- bool is_increment,
- TypeInfo input_type)
- : dst_(dst),
- old_(old),
- is_increment_(is_increment),
- input_type_(input_type) {
- set_comment("[ DeferredCountOperation");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- Register old_;
- bool is_increment_;
- TypeInfo input_type_;
-};
-
-
-void DeferredPostfixCountOperation::Generate() {
- // Undo the optimistic smi operation.
- if (is_increment_) {
- __ sub(Operand(dst_), Immediate(Smi::FromInt(1)));
- } else {
- __ add(Operand(dst_), Immediate(Smi::FromInt(1)));
- }
- Register left;
- if (input_type_.IsNumber()) {
- __ push(dst_); // Save the input to use as the old value.
- left = dst_;
- } else {
- __ push(dst_);
- __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
- __ push(eax); // Save the result of ToNumber to use as the old value.
- left = eax;
- }
-
- GenericBinaryOpStub stub(is_increment_ ? Token::ADD : Token::SUB,
- NO_OVERWRITE,
- NO_GENERIC_BINARY_FLAGS,
- TypeInfo::Number());
- stub.GenerateCall(masm_, left, Smi::FromInt(1));
-
- if (!dst_.is(eax)) __ mov(dst_, eax);
- __ pop(old_);
-}
-
-
-void CodeGenerator::VisitCountOperation(CountOperation* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ CountOperation");
-
- bool is_postfix = node->is_postfix();
- bool is_increment = node->op() == Token::INC;
-
- Variable* var = node->expression()->AsVariableProxy()->AsVariable();
- bool is_const = (var != NULL && var->mode() == Variable::CONST);
-
- // Postfix operations need a stack slot under the reference to hold
- // the old value while the new value is being stored. This is so that
- // in the case that storing the new value requires a call, the old
- // value will be in the frame to be spilled.
- if (is_postfix) frame_->Push(Smi::FromInt(0));
-
- // A constant reference is not saved to, so a constant reference is not a
- // compound assignment reference.
- { Reference target(this, node->expression(), !is_const);
- if (target.is_illegal()) {
- // Spoof the virtual frame to have the expected height (one higher
- // than on entry).
- if (!is_postfix) frame_->Push(Smi::FromInt(0));
- return;
- }
- target.TakeValue();
-
- Result new_value = frame_->Pop();
- new_value.ToRegister();
-
- Result old_value; // Only allocated in the postfix case.
- if (is_postfix) {
- // Allocate a temporary to preserve the old value.
- old_value = allocator_->Allocate();
- ASSERT(old_value.is_valid());
- __ mov(old_value.reg(), new_value.reg());
-
- // The return value for postfix operations is ToNumber(input).
- // Keep more precise type info if the input is some kind of
- // number already. If the input is not a number we have to wait
- // for the deferred code to convert it.
- if (new_value.type_info().IsNumber()) {
- old_value.set_type_info(new_value.type_info());
- }
- }
-
- // Ensure the new value is writable.
- frame_->Spill(new_value.reg());
-
- Result tmp;
- if (new_value.is_smi()) {
- if (FLAG_debug_code) __ AbortIfNotSmi(new_value.reg());
- } else {
- // We don't know statically if the input is a smi.
- // In order to combine the overflow and the smi tag check, we need
- // to be able to allocate a byte register. We attempt to do so
- // without spilling. If we fail, we will generate separate overflow
- // and smi tag checks.
- // We allocate and clear a temporary byte register before performing
- // the count operation since clearing the register using xor will clear
- // the overflow flag.
- tmp = allocator_->AllocateByteRegisterWithoutSpilling();
- if (tmp.is_valid()) {
- __ Set(tmp.reg(), Immediate(0));
- }
- }
-
- if (is_increment) {
- __ add(Operand(new_value.reg()), Immediate(Smi::FromInt(1)));
- } else {
- __ sub(Operand(new_value.reg()), Immediate(Smi::FromInt(1)));
- }
-
- DeferredCode* deferred = NULL;
- if (is_postfix) {
- deferred = new DeferredPostfixCountOperation(new_value.reg(),
- old_value.reg(),
- is_increment,
- new_value.type_info());
- } else {
- deferred = new DeferredPrefixCountOperation(new_value.reg(),
- is_increment,
- new_value.type_info());
- }
-
- if (new_value.is_smi()) {
- // In case we have a smi as input just check for overflow.
- deferred->Branch(overflow);
- } else {
- // If the count operation didn't overflow and the result is a valid
- // smi, we're done. Otherwise, we jump to the deferred slow-case
- // code.
- // We combine the overflow and the smi tag check if we could
- // successfully allocate a temporary byte register.
- if (tmp.is_valid()) {
- __ setcc(overflow, tmp.reg());
- __ or_(Operand(tmp.reg()), new_value.reg());
- __ test(tmp.reg(), Immediate(kSmiTagMask));
- tmp.Unuse();
- deferred->Branch(not_zero);
- } else {
- // Otherwise we test separately for overflow and smi tag.
- deferred->Branch(overflow);
- __ test(new_value.reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- }
- }
- deferred->BindExit();
-
- // Postfix count operations return their input converted to
- // number. The case when the input is already a number is covered
- // above in the allocation code for old_value.
- if (is_postfix && !new_value.type_info().IsNumber()) {
- old_value.set_type_info(TypeInfo::Number());
- }
-
- // The result of ++ or -- is an Integer32 if the
- // input is a smi. Otherwise it is a number.
- if (new_value.is_smi()) {
- new_value.set_type_info(TypeInfo::Integer32());
- } else {
- new_value.set_type_info(TypeInfo::Number());
- }
-
- // Postfix: store the old value in the allocated slot under the
- // reference.
- if (is_postfix) frame_->SetElementAt(target.size(), &old_value);
-
- frame_->Push(&new_value);
- // Non-constant: update the reference.
- if (!is_const) target.SetValue(NOT_CONST_INIT);
- }
-
- // Postfix: drop the new value and use the old.
- if (is_postfix) frame_->Drop();
-}
-
-
-void CodeGenerator::Int32BinaryOperation(BinaryOperation* node) {
- Token::Value op = node->op();
- Comment cmnt(masm_, "[ Int32BinaryOperation");
- ASSERT(in_safe_int32_mode());
- ASSERT(safe_int32_mode_enabled());
- ASSERT(FLAG_safe_int32_compiler);
-
- if (op == Token::COMMA) {
- // Discard left value.
- frame_->Nip(1);
- return;
- }
-
- Result right = frame_->Pop();
- Result left = frame_->Pop();
-
- ASSERT(right.is_untagged_int32());
- ASSERT(left.is_untagged_int32());
- // Registers containing an int32 value are not multiply used.
- ASSERT(!left.is_register() || !frame_->is_used(left.reg()));
- ASSERT(!right.is_register() || !frame_->is_used(right.reg()));
-
- switch (op) {
- case Token::COMMA:
- case Token::OR:
- case Token::AND:
- UNREACHABLE();
- break;
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND:
- if (left.is_constant() || right.is_constant()) {
- int32_t value; // Put constant in value, non-constant in left.
- // Constants are known to be int32 values, from static analysis,
- // or else will be converted to int32 by implicit ECMA [[ToInt32]].
- if (left.is_constant()) {
- ASSERT(left.handle()->IsSmi() || left.handle()->IsHeapNumber());
- value = NumberToInt32(*left.handle());
- left = right;
- } else {
- ASSERT(right.handle()->IsSmi() || right.handle()->IsHeapNumber());
- value = NumberToInt32(*right.handle());
- }
-
- left.ToRegister();
- if (op == Token::BIT_OR) {
- __ or_(Operand(left.reg()), Immediate(value));
- } else if (op == Token::BIT_XOR) {
- __ xor_(Operand(left.reg()), Immediate(value));
- } else {
- ASSERT(op == Token::BIT_AND);
- __ and_(Operand(left.reg()), Immediate(value));
- }
- } else {
- ASSERT(left.is_register());
- ASSERT(right.is_register());
- if (op == Token::BIT_OR) {
- __ or_(left.reg(), Operand(right.reg()));
- } else if (op == Token::BIT_XOR) {
- __ xor_(left.reg(), Operand(right.reg()));
- } else {
- ASSERT(op == Token::BIT_AND);
- __ and_(left.reg(), Operand(right.reg()));
- }
- }
- frame_->Push(&left);
- right.Unuse();
- break;
- case Token::SAR:
- case Token::SHL:
- case Token::SHR: {
- bool test_shr_overflow = false;
- left.ToRegister();
- if (right.is_constant()) {
- ASSERT(right.handle()->IsSmi() || right.handle()->IsHeapNumber());
- int shift_amount = NumberToInt32(*right.handle()) & 0x1F;
- if (op == Token::SAR) {
- __ sar(left.reg(), shift_amount);
- } else if (op == Token::SHL) {
- __ shl(left.reg(), shift_amount);
- } else {
- ASSERT(op == Token::SHR);
- __ shr(left.reg(), shift_amount);
- if (shift_amount == 0) test_shr_overflow = true;
- }
- } else {
- // Move right to ecx
- if (left.is_register() && left.reg().is(ecx)) {
- right.ToRegister();
- __ xchg(left.reg(), right.reg());
- left = right; // Left is unused here, copy of right unused by Push.
- } else {
- right.ToRegister(ecx);
- left.ToRegister();
- }
- if (op == Token::SAR) {
- __ sar_cl(left.reg());
- } else if (op == Token::SHL) {
- __ shl_cl(left.reg());
- } else {
- ASSERT(op == Token::SHR);
- __ shr_cl(left.reg());
- test_shr_overflow = true;
- }
- }
- {
- Register left_reg = left.reg();
- frame_->Push(&left);
- right.Unuse();
- if (test_shr_overflow && !node->to_int32()) {
- // Uint32 results with top bit set are not Int32 values.
- // If they will be forced to Int32, skip the test.
- // Test is needed because shr with shift amount 0 does not set flags.
- __ test(left_reg, Operand(left_reg));
- unsafe_bailout_->Branch(sign);
- }
- }
- break;
- }
- case Token::ADD:
- case Token::SUB:
- case Token::MUL:
- if ((left.is_constant() && op != Token::SUB) || right.is_constant()) {
- int32_t value; // Put constant in value, non-constant in left.
- if (right.is_constant()) {
- ASSERT(right.handle()->IsSmi() || right.handle()->IsHeapNumber());
- value = NumberToInt32(*right.handle());
- } else {
- ASSERT(left.handle()->IsSmi() || left.handle()->IsHeapNumber());
- value = NumberToInt32(*left.handle());
- left = right;
- }
-
- left.ToRegister();
- if (op == Token::ADD) {
- __ add(Operand(left.reg()), Immediate(value));
- } else if (op == Token::SUB) {
- __ sub(Operand(left.reg()), Immediate(value));
- } else {
- ASSERT(op == Token::MUL);
- __ imul(left.reg(), left.reg(), value);
- }
- } else {
- left.ToRegister();
- ASSERT(left.is_register());
- ASSERT(right.is_register());
- if (op == Token::ADD) {
- __ add(left.reg(), Operand(right.reg()));
- } else if (op == Token::SUB) {
- __ sub(left.reg(), Operand(right.reg()));
- } else {
- ASSERT(op == Token::MUL);
- // We have statically verified that a negative zero can be ignored.
- __ imul(left.reg(), Operand(right.reg()));
- }
- }
- right.Unuse();
- frame_->Push(&left);
- if (!node->to_int32() || op == Token::MUL) {
- // If ToInt32 is called on the result of ADD, SUB, we don't
- // care about overflows.
- // Result of MUL can be non-representable precisely in double so
- // we have to check for overflow.
- unsafe_bailout_->Branch(overflow);
- }
- break;
- case Token::DIV:
- case Token::MOD: {
- if (right.is_register() && (right.reg().is(eax) || right.reg().is(edx))) {
- if (left.is_register() && left.reg().is(edi)) {
- right.ToRegister(ebx);
- } else {
- right.ToRegister(edi);
- }
- }
- left.ToRegister(eax);
- Result edx_reg = allocator_->Allocate(edx);
- right.ToRegister();
- // The results are unused here because BreakTarget::Branch cannot handle
- // live results.
- Register right_reg = right.reg();
- left.Unuse();
- right.Unuse();
- edx_reg.Unuse();
- __ cmp(right_reg, 0);
- // Ensure divisor is positive: no chance of non-int32 or -0 result.
- unsafe_bailout_->Branch(less_equal);
- __ cdq(); // Sign-extend eax into edx:eax
- __ idiv(right_reg);
- if (op == Token::MOD) {
- // Negative zero can arise as a negative divident with a zero result.
- if (!node->no_negative_zero()) {
- Label not_negative_zero;
- __ test(edx, Operand(edx));
- __ j(not_zero, ¬_negative_zero);
- __ test(eax, Operand(eax));
- unsafe_bailout_->Branch(negative);
- __ bind(¬_negative_zero);
- }
- Result edx_result(edx, TypeInfo::Integer32());
- edx_result.set_untagged_int32(true);
- frame_->Push(&edx_result);
- } else {
- ASSERT(op == Token::DIV);
- __ test(edx, Operand(edx));
- unsafe_bailout_->Branch(not_equal);
- Result eax_result(eax, TypeInfo::Integer32());
- eax_result.set_untagged_int32(true);
- frame_->Push(&eax_result);
- }
- break;
- }
- default:
- UNREACHABLE();
- break;
- }
-}
-
-
-void CodeGenerator::GenerateLogicalBooleanOperation(BinaryOperation* node) {
- // According to ECMA-262 section 11.11, page 58, the binary logical
- // operators must yield the result of one of the two expressions
- // before any ToBoolean() conversions. This means that the value
- // produced by a && or || operator is not necessarily a boolean.
-
- // NOTE: If the left hand side produces a materialized value (not
- // control flow), we force the right hand side to do the same. This
- // is necessary because we assume that if we get control flow on the
- // last path out of an expression we got it on all paths.
- if (node->op() == Token::AND) {
- ASSERT(!in_safe_int32_mode());
- JumpTarget is_true;
- ControlDestination dest(&is_true, destination()->false_target(), true);
- LoadCondition(node->left(), &dest, false);
-
- if (dest.false_was_fall_through()) {
- // The current false target was used as the fall-through. If
- // there are no dangling jumps to is_true then the left
- // subexpression was unconditionally false. Otherwise we have
- // paths where we do have to evaluate the right subexpression.
- if (is_true.is_linked()) {
- // We need to compile the right subexpression. If the jump to
- // the current false target was a forward jump then we have a
- // valid frame, we have just bound the false target, and we
- // have to jump around the code for the right subexpression.
- if (has_valid_frame()) {
- destination()->false_target()->Unuse();
- destination()->false_target()->Jump();
- }
- is_true.Bind();
- // The left subexpression compiled to control flow, so the
- // right one is free to do so as well.
- LoadCondition(node->right(), destination(), false);
- } else {
- // We have actually just jumped to or bound the current false
- // target but the current control destination is not marked as
- // used.
- destination()->Use(false);
- }
-
- } else if (dest.is_used()) {
- // The left subexpression compiled to control flow (and is_true
- // was just bound), so the right is free to do so as well.
- LoadCondition(node->right(), destination(), false);
-
- } else {
- // We have a materialized value on the frame, so we exit with
- // one on all paths. There are possibly also jumps to is_true
- // from nested subexpressions.
- JumpTarget pop_and_continue;
- JumpTarget exit;
-
- // Avoid popping the result if it converts to 'false' using the
- // standard ToBoolean() conversion as described in ECMA-262,
- // section 9.2, page 30.
- //
- // Duplicate the TOS value. The duplicate will be popped by
- // ToBoolean.
- frame_->Dup();
- ControlDestination dest(&pop_and_continue, &exit, true);
- ToBoolean(&dest);
-
- // Pop the result of evaluating the first part.
- frame_->Drop();
-
- // Compile right side expression.
- is_true.Bind();
- Load(node->right());
-
- // Exit (always with a materialized value).
- exit.Bind();
- }
-
- } else {
- ASSERT(node->op() == Token::OR);
- ASSERT(!in_safe_int32_mode());
- JumpTarget is_false;
- ControlDestination dest(destination()->true_target(), &is_false, false);
- LoadCondition(node->left(), &dest, false);
-
- if (dest.true_was_fall_through()) {
- // The current true target was used as the fall-through. If
- // there are no dangling jumps to is_false then the left
- // subexpression was unconditionally true. Otherwise we have
- // paths where we do have to evaluate the right subexpression.
- if (is_false.is_linked()) {
- // We need to compile the right subexpression. If the jump to
- // the current true target was a forward jump then we have a
- // valid frame, we have just bound the true target, and we
- // have to jump around the code for the right subexpression.
- if (has_valid_frame()) {
- destination()->true_target()->Unuse();
- destination()->true_target()->Jump();
- }
- is_false.Bind();
- // The left subexpression compiled to control flow, so the
- // right one is free to do so as well.
- LoadCondition(node->right(), destination(), false);
- } else {
- // We have just jumped to or bound the current true target but
- // the current control destination is not marked as used.
- destination()->Use(true);
- }
-
- } else if (dest.is_used()) {
- // The left subexpression compiled to control flow (and is_false
- // was just bound), so the right is free to do so as well.
- LoadCondition(node->right(), destination(), false);
-
- } else {
- // We have a materialized value on the frame, so we exit with
- // one on all paths. There are possibly also jumps to is_false
- // from nested subexpressions.
- JumpTarget pop_and_continue;
- JumpTarget exit;
-
- // Avoid popping the result if it converts to 'true' using the
- // standard ToBoolean() conversion as described in ECMA-262,
- // section 9.2, page 30.
- //
- // Duplicate the TOS value. The duplicate will be popped by
- // ToBoolean.
- frame_->Dup();
- ControlDestination dest(&exit, &pop_and_continue, false);
- ToBoolean(&dest);
-
- // Pop the result of evaluating the first part.
- frame_->Drop();
-
- // Compile right side expression.
- is_false.Bind();
- Load(node->right());
-
- // Exit (always with a materialized value).
- exit.Bind();
- }
- }
-}
-
-
-void CodeGenerator::VisitBinaryOperation(BinaryOperation* node) {
- Comment cmnt(masm_, "[ BinaryOperation");
-
- if (node->op() == Token::AND || node->op() == Token::OR) {
- GenerateLogicalBooleanOperation(node);
- } else if (in_safe_int32_mode()) {
- Visit(node->left());
- Visit(node->right());
- Int32BinaryOperation(node);
- } else {
- // NOTE: The code below assumes that the slow cases (calls to runtime)
- // never return a constant/immutable object.
- OverwriteMode overwrite_mode = NO_OVERWRITE;
- if (node->left()->ResultOverwriteAllowed()) {
- overwrite_mode = OVERWRITE_LEFT;
- } else if (node->right()->ResultOverwriteAllowed()) {
- overwrite_mode = OVERWRITE_RIGHT;
- }
-
- if (node->left()->IsTrivial()) {
- Load(node->right());
- Result right = frame_->Pop();
- frame_->Push(node->left());
- frame_->Push(&right);
- } else {
- Load(node->left());
- Load(node->right());
- }
- GenericBinaryOperation(node, overwrite_mode);
- }
-}
-
-
-void CodeGenerator::VisitThisFunction(ThisFunction* node) {
- ASSERT(!in_safe_int32_mode());
- frame_->PushFunction();
-}
-
-
-void CodeGenerator::VisitCompareOperation(CompareOperation* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ CompareOperation");
-
- bool left_already_loaded = false;
-
- // Get the expressions from the node.
- Expression* left = node->left();
- Expression* right = node->right();
- Token::Value op = node->op();
- // To make typeof testing for natives implemented in JavaScript really
- // efficient, we generate special code for expressions of the form:
- // 'typeof <expression> == <string>'.
- UnaryOperation* operation = left->AsUnaryOperation();
- if ((op == Token::EQ || op == Token::EQ_STRICT) &&
- (operation != NULL && operation->op() == Token::TYPEOF) &&
- (right->AsLiteral() != NULL &&
- right->AsLiteral()->handle()->IsString())) {
- Handle<String> check(String::cast(*right->AsLiteral()->handle()));
-
- // Load the operand and move it to a register.
- LoadTypeofExpression(operation->expression());
- Result answer = frame_->Pop();
- answer.ToRegister();
-
- if (check->Equals(HEAP->number_symbol())) {
- __ test(answer.reg(), Immediate(kSmiTagMask));
- destination()->true_target()->Branch(zero);
- frame_->Spill(answer.reg());
- __ mov(answer.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset));
- __ cmp(answer.reg(), FACTORY->heap_number_map());
- answer.Unuse();
- destination()->Split(equal);
-
- } else if (check->Equals(HEAP->string_symbol())) {
- __ test(answer.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
-
- // It can be an undetectable string object.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset));
- __ test_b(FieldOperand(temp.reg(), Map::kBitFieldOffset),
- 1 << Map::kIsUndetectable);
- destination()->false_target()->Branch(not_zero);
- __ CmpInstanceType(temp.reg(), FIRST_NONSTRING_TYPE);
- temp.Unuse();
- answer.Unuse();
- destination()->Split(below);
-
- } else if (check->Equals(HEAP->boolean_symbol())) {
- __ cmp(answer.reg(), FACTORY->true_value());
- destination()->true_target()->Branch(equal);
- __ cmp(answer.reg(), FACTORY->false_value());
- answer.Unuse();
- destination()->Split(equal);
-
- } else if (check->Equals(HEAP->undefined_symbol())) {
- __ cmp(answer.reg(), FACTORY->undefined_value());
- destination()->true_target()->Branch(equal);
-
- __ test(answer.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
-
- // It can be an undetectable object.
- frame_->Spill(answer.reg());
- __ mov(answer.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset));
- __ test_b(FieldOperand(answer.reg(), Map::kBitFieldOffset),
- 1 << Map::kIsUndetectable);
- answer.Unuse();
- destination()->Split(not_zero);
-
- } else if (check->Equals(HEAP->function_symbol())) {
- __ test(answer.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
- frame_->Spill(answer.reg());
- __ CmpObjectType(answer.reg(), JS_FUNCTION_TYPE, answer.reg());
- destination()->true_target()->Branch(equal);
- // Regular expressions are callable so typeof == 'function'.
- __ CmpInstanceType(answer.reg(), JS_REGEXP_TYPE);
- answer.Unuse();
- destination()->Split(equal);
- } else if (check->Equals(HEAP->object_symbol())) {
- __ test(answer.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(zero);
- __ cmp(answer.reg(), FACTORY->null_value());
- destination()->true_target()->Branch(equal);
-
- Result map = allocator()->Allocate();
- ASSERT(map.is_valid());
- // Regular expressions are typeof == 'function', not 'object'.
- __ CmpObjectType(answer.reg(), JS_REGEXP_TYPE, map.reg());
- destination()->false_target()->Branch(equal);
-
- // It can be an undetectable object.
- __ test_b(FieldOperand(map.reg(), Map::kBitFieldOffset),
- 1 << Map::kIsUndetectable);
- destination()->false_target()->Branch(not_zero);
- // Do a range test for JSObject type. We can't use
- // MacroAssembler::IsInstanceJSObjectType, because we are using a
- // ControlDestination, so we copy its implementation here.
- __ movzx_b(map.reg(), FieldOperand(map.reg(), Map::kInstanceTypeOffset));
- __ sub(Operand(map.reg()), Immediate(FIRST_JS_OBJECT_TYPE));
- __ cmp(map.reg(), LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE);
- answer.Unuse();
- map.Unuse();
- destination()->Split(below_equal);
- } else {
- // Uncommon case: typeof testing against a string literal that is
- // never returned from the typeof operator.
- answer.Unuse();
- destination()->Goto(false);
- }
- return;
- } else if (op == Token::LT &&
- right->AsLiteral() != NULL &&
- right->AsLiteral()->handle()->IsHeapNumber()) {
- Handle<HeapNumber> check(HeapNumber::cast(*right->AsLiteral()->handle()));
- if (check->value() == 2147483648.0) { // 0x80000000.
- Load(left);
- left_already_loaded = true;
- Result lhs = frame_->Pop();
- lhs.ToRegister();
- __ test(lhs.reg(), Immediate(kSmiTagMask));
- destination()->true_target()->Branch(zero); // All Smis are less.
- Result scratch = allocator()->Allocate();
- ASSERT(scratch.is_valid());
- __ mov(scratch.reg(), FieldOperand(lhs.reg(), HeapObject::kMapOffset));
- __ cmp(scratch.reg(), FACTORY->heap_number_map());
- JumpTarget not_a_number;
- not_a_number.Branch(not_equal, &lhs);
- __ mov(scratch.reg(),
- FieldOperand(lhs.reg(), HeapNumber::kExponentOffset));
- __ cmp(Operand(scratch.reg()), Immediate(0xfff00000));
- not_a_number.Branch(above_equal, &lhs); // It's a negative NaN or -Inf.
- const uint32_t borderline_exponent =
- (HeapNumber::kExponentBias + 31) << HeapNumber::kExponentShift;
- __ cmp(Operand(scratch.reg()), Immediate(borderline_exponent));
- scratch.Unuse();
- lhs.Unuse();
- destination()->true_target()->Branch(less);
- destination()->false_target()->Jump();
-
- not_a_number.Bind(&lhs);
- frame_->Push(&lhs);
- }
- }
-
- Condition cc = no_condition;
- bool strict = false;
- switch (op) {
- case Token::EQ_STRICT:
- strict = true;
- // Fall through
- case Token::EQ:
- cc = equal;
- break;
- case Token::LT:
- cc = less;
- break;
- case Token::GT:
- cc = greater;
- break;
- case Token::LTE:
- cc = less_equal;
- break;
- case Token::GTE:
- cc = greater_equal;
- break;
- case Token::IN: {
- if (!left_already_loaded) Load(left);
- Load(right);
- Result answer = frame_->InvokeBuiltin(Builtins::IN, CALL_FUNCTION, 2);
- frame_->Push(&answer); // push the result
- return;
- }
- case Token::INSTANCEOF: {
- if (!left_already_loaded) Load(left);
- Load(right);
- InstanceofStub stub(InstanceofStub::kNoFlags);
- Result answer = frame_->CallStub(&stub, 2);
- answer.ToRegister();
- __ test(answer.reg(), Operand(answer.reg()));
- answer.Unuse();
- destination()->Split(zero);
- return;
- }
- default:
- UNREACHABLE();
- }
-
- if (left->IsTrivial()) {
- if (!left_already_loaded) {
- Load(right);
- Result right_result = frame_->Pop();
- frame_->Push(left);
- frame_->Push(&right_result);
- } else {
- Load(right);
- }
- } else {
- if (!left_already_loaded) Load(left);
- Load(right);
- }
- Comparison(node, cc, strict, destination());
-}
-
-
-void CodeGenerator::VisitCompareToNull(CompareToNull* node) {
- ASSERT(!in_safe_int32_mode());
- Comment cmnt(masm_, "[ CompareToNull");
-
- Load(node->expression());
- Result operand = frame_->Pop();
- operand.ToRegister();
- __ cmp(operand.reg(), FACTORY->null_value());
- if (node->is_strict()) {
- operand.Unuse();
- destination()->Split(equal);
- } else {
- // The 'null' value is only equal to 'undefined' if using non-strict
- // comparisons.
- destination()->true_target()->Branch(equal);
- __ cmp(operand.reg(), FACTORY->undefined_value());
- destination()->true_target()->Branch(equal);
- __ test(operand.reg(), Immediate(kSmiTagMask));
- destination()->false_target()->Branch(equal);
-
- // It can be an undetectable object.
- // Use a scratch register in preference to spilling operand.reg().
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(),
- FieldOperand(operand.reg(), HeapObject::kMapOffset));
- __ test_b(FieldOperand(temp.reg(), Map::kBitFieldOffset),
- 1 << Map::kIsUndetectable);
- temp.Unuse();
- operand.Unuse();
- destination()->Split(not_zero);
- }
-}
-
-
-#ifdef DEBUG
-bool CodeGenerator::HasValidEntryRegisters() {
- return (allocator()->count(eax) == (frame()->is_used(eax) ? 1 : 0))
- && (allocator()->count(ebx) == (frame()->is_used(ebx) ? 1 : 0))
- && (allocator()->count(ecx) == (frame()->is_used(ecx) ? 1 : 0))
- && (allocator()->count(edx) == (frame()->is_used(edx) ? 1 : 0))
- && (allocator()->count(edi) == (frame()->is_used(edi) ? 1 : 0));
-}
-#endif
-
-
-// Emit a LoadIC call to get the value from receiver and leave it in
-// dst.
-class DeferredReferenceGetNamedValue: public DeferredCode {
- public:
- DeferredReferenceGetNamedValue(Register dst,
- Register receiver,
- Handle<String> name,
- bool is_contextual)
- : dst_(dst),
- receiver_(receiver),
- name_(name),
- is_contextual_(is_contextual),
- is_dont_delete_(false) {
- set_comment(is_contextual
- ? "[ DeferredReferenceGetNamedValue (contextual)"
- : "[ DeferredReferenceGetNamedValue");
- }
-
- virtual void Generate();
-
- Label* patch_site() { return &patch_site_; }
-
- void set_is_dont_delete(bool value) {
- ASSERT(is_contextual_);
- is_dont_delete_ = value;
- }
-
- private:
- Label patch_site_;
- Register dst_;
- Register receiver_;
- Handle<String> name_;
- bool is_contextual_;
- bool is_dont_delete_;
-};
-
-
-void DeferredReferenceGetNamedValue::Generate() {
- if (!receiver_.is(eax)) {
- __ mov(eax, receiver_);
- }
- __ Set(ecx, Immediate(name_));
- Handle<Code> ic(masm()->isolate()->builtins()->builtin(
- Builtins::kLoadIC_Initialize));
- RelocInfo::Mode mode = is_contextual_
- ? RelocInfo::CODE_TARGET_CONTEXT
- : RelocInfo::CODE_TARGET;
- __ call(ic, mode);
- // The call must be followed by:
- // - a test eax instruction to indicate that the inobject property
- // case was inlined.
- // - a mov ecx or mov edx instruction to indicate that the
- // contextual property load was inlined.
- //
- // Store the delta to the map check instruction here in the test
- // instruction. Use masm_-> instead of the __ macro since the
- // latter can't return a value.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site());
- // Here we use masm_-> instead of the __ macro because this is the
- // instruction that gets patched and coverage code gets in the way.
- Counters* counters = masm()->isolate()->counters();
- if (is_contextual_) {
- masm_->mov(is_dont_delete_ ? edx : ecx, -delta_to_patch_site);
- __ IncrementCounter(counters->named_load_global_inline_miss(), 1);
- if (is_dont_delete_) {
- __ IncrementCounter(counters->dont_delete_hint_miss(), 1);
- }
- } else {
- masm_->test(eax, Immediate(-delta_to_patch_site));
- __ IncrementCounter(counters->named_load_inline_miss(), 1);
- }
-
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-class DeferredReferenceGetKeyedValue: public DeferredCode {
- public:
- explicit DeferredReferenceGetKeyedValue(Register dst,
- Register receiver,
- Register key)
- : dst_(dst), receiver_(receiver), key_(key) {
- set_comment("[ DeferredReferenceGetKeyedValue");
- }
-
- virtual void Generate();
-
- Label* patch_site() { return &patch_site_; }
-
- private:
- Label patch_site_;
- Register dst_;
- Register receiver_;
- Register key_;
-};
-
-
-void DeferredReferenceGetKeyedValue::Generate() {
- if (!receiver_.is(eax)) {
- // Register eax is available for key.
- if (!key_.is(eax)) {
- __ mov(eax, key_);
- }
- if (!receiver_.is(edx)) {
- __ mov(edx, receiver_);
- }
- } else if (!key_.is(edx)) {
- // Register edx is available for receiver.
- if (!receiver_.is(edx)) {
- __ mov(edx, receiver_);
- }
- if (!key_.is(eax)) {
- __ mov(eax, key_);
- }
- } else {
- __ xchg(edx, eax);
- }
- // Calculate the delta from the IC call instruction to the map check
- // cmp instruction in the inlined version. This delta is stored in
- // a test(eax, delta) instruction after the call so that we can find
- // it in the IC initialization code and patch the cmp instruction.
- // This means that we cannot allow test instructions after calls to
- // KeyedLoadIC stubs in other places.
- Handle<Code> ic(masm()->isolate()->builtins()->builtin(
- Builtins::kKeyedLoadIC_Initialize));
- __ call(ic, RelocInfo::CODE_TARGET);
- // The delta from the start of the map-compare instruction to the
- // test instruction. We use masm_-> directly here instead of the __
- // macro because the macro sometimes uses macro expansion to turn
- // into something that can't return a value. This is encountered
- // when doing generated code coverage tests.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site());
- // Here we use masm_-> instead of the __ macro because this is the
- // instruction that gets patched and coverage code gets in the way.
- masm_->test(eax, Immediate(-delta_to_patch_site));
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->keyed_load_inline_miss(), 1);
-
- if (!dst_.is(eax)) __ mov(dst_, eax);
-}
-
-
-class DeferredReferenceSetKeyedValue: public DeferredCode {
- public:
- DeferredReferenceSetKeyedValue(Register value,
- Register key,
- Register receiver,
- Register scratch,
- StrictModeFlag strict_mode)
- : value_(value),
- key_(key),
- receiver_(receiver),
- scratch_(scratch),
- strict_mode_(strict_mode) {
- set_comment("[ DeferredReferenceSetKeyedValue");
- }
-
- virtual void Generate();
-
- Label* patch_site() { return &patch_site_; }
-
- private:
- Register value_;
- Register key_;
- Register receiver_;
- Register scratch_;
- Label patch_site_;
- StrictModeFlag strict_mode_;
-};
-
-
-void DeferredReferenceSetKeyedValue::Generate() {
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->keyed_store_inline_miss(), 1);
- // Move value_ to eax, key_ to ecx, and receiver_ to edx.
- Register old_value = value_;
-
- // First, move value to eax.
- if (!value_.is(eax)) {
- if (key_.is(eax)) {
- // Move key_ out of eax, preferably to ecx.
- if (!value_.is(ecx) && !receiver_.is(ecx)) {
- __ mov(ecx, key_);
- key_ = ecx;
- } else {
- __ mov(scratch_, key_);
- key_ = scratch_;
- }
- }
- if (receiver_.is(eax)) {
- // Move receiver_ out of eax, preferably to edx.
- if (!value_.is(edx) && !key_.is(edx)) {
- __ mov(edx, receiver_);
- receiver_ = edx;
- } else {
- // Both moves to scratch are from eax, also, no valid path hits both.
- __ mov(scratch_, receiver_);
- receiver_ = scratch_;
- }
- }
- __ mov(eax, value_);
- value_ = eax;
- }
-
- // Now value_ is in eax. Move the other two to the right positions.
- // We do not update the variables key_ and receiver_ to ecx and edx.
- if (key_.is(ecx)) {
- if (!receiver_.is(edx)) {
- __ mov(edx, receiver_);
- }
- } else if (key_.is(edx)) {
- if (receiver_.is(ecx)) {
- __ xchg(edx, ecx);
- } else {
- __ mov(ecx, key_);
- if (!receiver_.is(edx)) {
- __ mov(edx, receiver_);
- }
- }
- } else { // Key is not in edx or ecx.
- if (!receiver_.is(edx)) {
- __ mov(edx, receiver_);
- }
- __ mov(ecx, key_);
- }
-
- // Call the IC stub.
- Handle<Code> ic(masm()->isolate()->builtins()->builtin(
- (strict_mode_ == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict
- : Builtins::kKeyedStoreIC_Initialize));
- __ call(ic, RelocInfo::CODE_TARGET);
- // The delta from the start of the map-compare instruction to the
- // test instruction. We use masm_-> directly here instead of the
- // __ macro because the macro sometimes uses macro expansion to turn
- // into something that can't return a value. This is encountered
- // when doing generated code coverage tests.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site());
- // Here we use masm_-> instead of the __ macro because this is the
- // instruction that gets patched and coverage code gets in the way.
- masm_->test(eax, Immediate(-delta_to_patch_site));
- // Restore value (returned from store IC) register.
- if (!old_value.is(eax)) __ mov(old_value, eax);
-}
-
-
-Result CodeGenerator::EmitNamedLoad(Handle<String> name, bool is_contextual) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
-
- Isolate* isolate = masm()->isolate();
- Factory* factory = isolate->factory();
- Counters* counters = isolate->counters();
-
- bool contextual_load_in_builtin =
- is_contextual &&
- (isolate->bootstrapper()->IsActive() ||
- (!info_->closure().is_null() && info_->closure()->IsBuiltin()));
-
- Result result;
- // Do not inline in the global code or when not in loop.
- if (scope()->is_global_scope() ||
- loop_nesting() == 0 ||
- contextual_load_in_builtin) {
- Comment cmnt(masm(), "[ Load from named Property");
- frame()->Push(name);
-
- RelocInfo::Mode mode = is_contextual
- ? RelocInfo::CODE_TARGET_CONTEXT
- : RelocInfo::CODE_TARGET;
- result = frame()->CallLoadIC(mode);
- // A test eax instruction following the call signals that the inobject
- // property case was inlined. Ensure that there is not a test eax
- // instruction here.
- __ nop();
- } else {
- // Inline the property load.
- Comment cmnt(masm(), is_contextual
- ? "[ Inlined contextual property load"
- : "[ Inlined named property load");
- Result receiver = frame()->Pop();
- receiver.ToRegister();
-
- result = allocator()->Allocate();
- ASSERT(result.is_valid());
- DeferredReferenceGetNamedValue* deferred =
- new DeferredReferenceGetNamedValue(result.reg(),
- receiver.reg(),
- name,
- is_contextual);
-
- if (!is_contextual) {
- // Check that the receiver is a heap object.
- __ test(receiver.reg(), Immediate(kSmiTagMask));
- deferred->Branch(zero);
- }
-
- __ bind(deferred->patch_site());
- // This is the map check instruction that will be patched (so we can't
- // use the double underscore macro that may insert instructions).
- // Initially use an invalid map to force a failure.
- masm()->cmp(FieldOperand(receiver.reg(), HeapObject::kMapOffset),
- Immediate(factory->null_value()));
- // This branch is always a forwards branch so it's always a fixed size
- // which allows the assert below to succeed and patching to work.
- deferred->Branch(not_equal);
-
- // The delta from the patch label to the actual load must be
- // statically known.
- ASSERT(masm()->SizeOfCodeGeneratedSince(deferred->patch_site()) ==
- LoadIC::kOffsetToLoadInstruction);
-
- if (is_contextual) {
- // Load the (initialy invalid) cell and get its value.
- masm()->mov(result.reg(), factory->null_value());
- if (FLAG_debug_code) {
- __ cmp(FieldOperand(result.reg(), HeapObject::kMapOffset),
- factory->global_property_cell_map());
- __ Assert(equal, "Uninitialized inlined contextual load");
- }
- __ mov(result.reg(),
- FieldOperand(result.reg(), JSGlobalPropertyCell::kValueOffset));
- __ cmp(result.reg(), factory->the_hole_value());
- deferred->Branch(equal);
- bool is_dont_delete = false;
- if (!info_->closure().is_null()) {
- // When doing lazy compilation we can check if the global cell
- // already exists and use its "don't delete" status as a hint.
- AssertNoAllocation no_gc;
- v8::internal::GlobalObject* global_object =
- info_->closure()->context()->global();
- LookupResult lookup;
- global_object->LocalLookupRealNamedProperty(*name, &lookup);
- if (lookup.IsProperty() && lookup.type() == NORMAL) {
- ASSERT(lookup.holder() == global_object);
- ASSERT(global_object->property_dictionary()->ValueAt(
- lookup.GetDictionaryEntry())->IsJSGlobalPropertyCell());
- is_dont_delete = lookup.IsDontDelete();
- }
- }
- deferred->set_is_dont_delete(is_dont_delete);
- if (!is_dont_delete) {
- __ cmp(result.reg(), factory->the_hole_value());
- deferred->Branch(equal);
- } else if (FLAG_debug_code) {
- __ cmp(result.reg(), factory->the_hole_value());
- __ Check(not_equal, "DontDelete cells can't contain the hole");
- }
- __ IncrementCounter(counters->named_load_global_inline(), 1);
- if (is_dont_delete) {
- __ IncrementCounter(counters->dont_delete_hint_hit(), 1);
- }
- } else {
- // The initial (invalid) offset has to be large enough to force a 32-bit
- // instruction encoding to allow patching with an arbitrary offset. Use
- // kMaxInt (minus kHeapObjectTag).
- int offset = kMaxInt;
- masm()->mov(result.reg(), FieldOperand(receiver.reg(), offset));
- __ IncrementCounter(counters->named_load_inline(), 1);
- }
-
- deferred->BindExit();
- }
- ASSERT(frame()->height() == original_height - 1);
- return result;
-}
-
-
-Result CodeGenerator::EmitNamedStore(Handle<String> name, bool is_contextual) {
-#ifdef DEBUG
- int expected_height = frame()->height() - (is_contextual ? 1 : 2);
-#endif
-
- Result result;
- if (is_contextual || scope()->is_global_scope() || loop_nesting() == 0) {
- result = frame()->CallStoreIC(name, is_contextual, strict_mode_flag());
- // A test eax instruction following the call signals that the inobject
- // property case was inlined. Ensure that there is not a test eax
- // instruction here.
- __ nop();
- } else {
- // Inline the in-object property case.
- JumpTarget slow, done;
- Label patch_site;
-
- // Get the value and receiver from the stack.
- Result value = frame()->Pop();
- value.ToRegister();
- Result receiver = frame()->Pop();
- receiver.ToRegister();
-
- // Allocate result register.
- result = allocator()->Allocate();
- ASSERT(result.is_valid() && receiver.is_valid() && value.is_valid());
-
- // Check that the receiver is a heap object.
- __ test(receiver.reg(), Immediate(kSmiTagMask));
- slow.Branch(zero, &value, &receiver);
-
- // This is the map check instruction that will be patched (so we can't
- // use the double underscore macro that may insert instructions).
- // Initially use an invalid map to force a failure.
- __ bind(&patch_site);
- masm()->cmp(FieldOperand(receiver.reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->null_value()));
- // This branch is always a forwards branch so it's always a fixed size
- // which allows the assert below to succeed and patching to work.
- slow.Branch(not_equal, &value, &receiver);
-
- // The delta from the patch label to the store offset must be
- // statically known.
- ASSERT(masm()->SizeOfCodeGeneratedSince(&patch_site) ==
- StoreIC::kOffsetToStoreInstruction);
-
- // The initial (invalid) offset has to be large enough to force a 32-bit
- // instruction encoding to allow patching with an arbitrary offset. Use
- // kMaxInt (minus kHeapObjectTag).
- int offset = kMaxInt;
- __ mov(FieldOperand(receiver.reg(), offset), value.reg());
- __ mov(result.reg(), Operand(value.reg()));
-
- // Allocate scratch register for write barrier.
- Result scratch = allocator()->Allocate();
- ASSERT(scratch.is_valid());
-
- // The write barrier clobbers all input registers, so spill the
- // receiver and the value.
- frame_->Spill(receiver.reg());
- frame_->Spill(value.reg());
-
- // If the receiver and the value share a register allocate a new
- // register for the receiver.
- if (receiver.reg().is(value.reg())) {
- receiver = allocator()->Allocate();
- ASSERT(receiver.is_valid());
- __ mov(receiver.reg(), Operand(value.reg()));
- }
-
- // Update the write barrier. To save instructions in the inlined
- // version we do not filter smis.
- Label skip_write_barrier;
- __ InNewSpace(receiver.reg(), value.reg(), equal, &skip_write_barrier);
- int delta_to_record_write = masm_->SizeOfCodeGeneratedSince(&patch_site);
- __ lea(scratch.reg(), Operand(receiver.reg(), offset));
- __ RecordWriteHelper(receiver.reg(), scratch.reg(), value.reg());
- if (FLAG_debug_code) {
- __ mov(receiver.reg(), Immediate(BitCast<int32_t>(kZapValue)));
- __ mov(value.reg(), Immediate(BitCast<int32_t>(kZapValue)));
- __ mov(scratch.reg(), Immediate(BitCast<int32_t>(kZapValue)));
- }
- __ bind(&skip_write_barrier);
- value.Unuse();
- scratch.Unuse();
- receiver.Unuse();
- done.Jump(&result);
-
- slow.Bind(&value, &receiver);
- frame()->Push(&receiver);
- frame()->Push(&value);
- result = frame()->CallStoreIC(name, is_contextual, strict_mode_flag());
- // Encode the offset to the map check instruction and the offset
- // to the write barrier store address computation in a test eax
- // instruction.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(&patch_site);
- __ test(eax,
- Immediate((delta_to_record_write << 16) | delta_to_patch_site));
- done.Bind(&result);
- }
-
- ASSERT_EQ(expected_height, frame()->height());
- return result;
-}
-
-
-Result CodeGenerator::EmitKeyedLoad() {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Result result;
- // Inline array load code if inside of a loop. We do not know the
- // receiver map yet, so we initially generate the code with a check
- // against an invalid map. In the inline cache code, we patch the map
- // check if appropriate.
- if (loop_nesting() > 0) {
- Comment cmnt(masm_, "[ Inlined load from keyed Property");
-
- // Use a fresh temporary to load the elements without destroying
- // the receiver which is needed for the deferred slow case.
- Result elements = allocator()->Allocate();
- ASSERT(elements.is_valid());
-
- Result key = frame_->Pop();
- Result receiver = frame_->Pop();
- key.ToRegister();
- receiver.ToRegister();
-
- // If key and receiver are shared registers on the frame, their values will
- // be automatically saved and restored when going to deferred code.
- // The result is in elements, which is guaranteed non-shared.
- DeferredReferenceGetKeyedValue* deferred =
- new DeferredReferenceGetKeyedValue(elements.reg(),
- receiver.reg(),
- key.reg());
-
- __ test(receiver.reg(), Immediate(kSmiTagMask));
- deferred->Branch(zero);
-
- // Check that the receiver has the expected map.
- // Initially, use an invalid map. The map is patched in the IC
- // initialization code.
- __ bind(deferred->patch_site());
- // Use masm-> here instead of the double underscore macro since extra
- // coverage code can interfere with the patching.
- masm_->cmp(FieldOperand(receiver.reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->null_value()));
- deferred->Branch(not_equal);
-
- // Check that the key is a smi.
- if (!key.is_smi()) {
- __ test(key.reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(key.reg());
- }
-
- // Get the elements array from the receiver.
- __ mov(elements.reg(),
- FieldOperand(receiver.reg(), JSObject::kElementsOffset));
- __ AssertFastElements(elements.reg());
-
- // Check that the key is within bounds.
- __ cmp(key.reg(),
- FieldOperand(elements.reg(), FixedArray::kLengthOffset));
- deferred->Branch(above_equal);
-
- // Load and check that the result is not the hole.
- // Key holds a smi.
- STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
- __ mov(elements.reg(),
- FieldOperand(elements.reg(),
- key.reg(),
- times_2,
- FixedArray::kHeaderSize));
- result = elements;
- __ cmp(Operand(result.reg()), Immediate(FACTORY->the_hole_value()));
- deferred->Branch(equal);
- __ IncrementCounter(masm_->isolate()->counters()->keyed_load_inline(), 1);
-
- deferred->BindExit();
- } else {
- Comment cmnt(masm_, "[ Load from keyed Property");
- result = frame_->CallKeyedLoadIC(RelocInfo::CODE_TARGET);
- // Make sure that we do not have a test instruction after the
- // call. A test instruction after the call is used to
- // indicate that we have generated an inline version of the
- // keyed load. The explicit nop instruction is here because
- // the push that follows might be peep-hole optimized away.
- __ nop();
- }
- ASSERT(frame()->height() == original_height - 2);
- return result;
-}
-
-
-Result CodeGenerator::EmitKeyedStore(StaticType* key_type) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Result result;
- // Generate inlined version of the keyed store if the code is in a loop
- // and the key is likely to be a smi.
- if (loop_nesting() > 0 && key_type->IsLikelySmi()) {
- Comment cmnt(masm(), "[ Inlined store to keyed Property");
-
- // Get the receiver, key and value into registers.
- result = frame()->Pop();
- Result key = frame()->Pop();
- Result receiver = frame()->Pop();
-
- Result tmp = allocator_->Allocate();
- ASSERT(tmp.is_valid());
- Result tmp2 = allocator_->Allocate();
- ASSERT(tmp2.is_valid());
-
- // Determine whether the value is a constant before putting it in a
- // register.
- bool value_is_constant = result.is_constant();
-
- // Make sure that value, key and receiver are in registers.
- result.ToRegister();
- key.ToRegister();
- receiver.ToRegister();
-
- DeferredReferenceSetKeyedValue* deferred =
- new DeferredReferenceSetKeyedValue(result.reg(),
- key.reg(),
- receiver.reg(),
- tmp.reg(),
- strict_mode_flag());
-
- // Check that the receiver is not a smi.
- __ test(receiver.reg(), Immediate(kSmiTagMask));
- deferred->Branch(zero);
-
- // Check that the key is a smi.
- if (!key.is_smi()) {
- __ test(key.reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(key.reg());
- }
-
- // Check that the receiver is a JSArray.
- __ CmpObjectType(receiver.reg(), JS_ARRAY_TYPE, tmp.reg());
- deferred->Branch(not_equal);
-
- // Get the elements array from the receiver and check that it is not a
- // dictionary.
- __ mov(tmp.reg(),
- FieldOperand(receiver.reg(), JSArray::kElementsOffset));
-
- // Check whether it is possible to omit the write barrier. If the elements
- // array is in new space or the value written is a smi we can safely update
- // the elements array without write barrier.
- Label in_new_space;
- __ InNewSpace(tmp.reg(), tmp2.reg(), equal, &in_new_space);
- if (!value_is_constant) {
- __ test(result.reg(), Immediate(kSmiTagMask));
- deferred->Branch(not_zero);
- }
-
- __ bind(&in_new_space);
- // Bind the deferred code patch site to be able to locate the fixed
- // array map comparison. When debugging, we patch this comparison to
- // always fail so that we will hit the IC call in the deferred code
- // which will allow the debugger to break for fast case stores.
- __ bind(deferred->patch_site());
- __ cmp(FieldOperand(tmp.reg(), HeapObject::kMapOffset),
- Immediate(FACTORY->fixed_array_map()));
- deferred->Branch(not_equal);
-
- // Check that the key is within bounds. Both the key and the length of
- // the JSArray are smis (because the fixed array check above ensures the
- // elements are in fast case). Use unsigned comparison to handle negative
- // keys.
- __ cmp(key.reg(),
- FieldOperand(receiver.reg(), JSArray::kLengthOffset));
- deferred->Branch(above_equal);
-
- // Store the value.
- __ mov(FixedArrayElementOperand(tmp.reg(), key.reg()), result.reg());
- __ IncrementCounter(masm_->isolate()->counters()->keyed_store_inline(), 1);
-
- deferred->BindExit();
- } else {
- result = frame()->CallKeyedStoreIC(strict_mode_flag());
- // Make sure that we do not have a test instruction after the
- // call. A test instruction after the call is used to
- // indicate that we have generated an inline version of the
- // keyed store.
- __ nop();
- }
- ASSERT(frame()->height() == original_height - 3);
- return result;
-}
-
-
-#undef __
-#define __ ACCESS_MASM(masm)
-
-
-Handle<String> Reference::GetName() {
- ASSERT(type_ == NAMED);
- Property* property = expression_->AsProperty();
- if (property == NULL) {
- // Global variable reference treated as a named property reference.
- VariableProxy* proxy = expression_->AsVariableProxy();
- ASSERT(proxy->AsVariable() != NULL);
- ASSERT(proxy->AsVariable()->is_global());
- return proxy->name();
- } else {
- Literal* raw_name = property->key()->AsLiteral();
- ASSERT(raw_name != NULL);
- return Handle<String>::cast(raw_name->handle());
- }
-}
-
-
-void Reference::GetValue() {
- ASSERT(!cgen_->in_spilled_code());
- ASSERT(cgen_->HasValidEntryRegisters());
- ASSERT(!is_illegal());
- MacroAssembler* masm = cgen_->masm();
-
- // Record the source position for the property load.
- Property* property = expression_->AsProperty();
- if (property != NULL) {
- cgen_->CodeForSourcePosition(property->position());
- }
-
- switch (type_) {
- case SLOT: {
- Comment cmnt(masm, "[ Load from Slot");
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- cgen_->LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
- if (!persist_after_get_) set_unloaded();
- break;
- }
-
- case NAMED: {
- Variable* var = expression_->AsVariableProxy()->AsVariable();
- bool is_global = var != NULL;
- ASSERT(!is_global || var->is_global());
- if (persist_after_get_) cgen_->frame()->Dup();
- Result result = cgen_->EmitNamedLoad(GetName(), is_global);
- if (!persist_after_get_) set_unloaded();
- cgen_->frame()->Push(&result);
- break;
- }
-
- case KEYED: {
- if (persist_after_get_) {
- cgen_->frame()->PushElementAt(1);
- cgen_->frame()->PushElementAt(1);
- }
- Result value = cgen_->EmitKeyedLoad();
- cgen_->frame()->Push(&value);
- if (!persist_after_get_) set_unloaded();
- break;
- }
-
- default:
- UNREACHABLE();
- }
-}
-
-
-void Reference::TakeValue() {
- // For non-constant frame-allocated slots, we invalidate the value in the
- // slot. For all others, we fall back on GetValue.
- ASSERT(!cgen_->in_spilled_code());
- ASSERT(!is_illegal());
- if (type_ != SLOT) {
- GetValue();
- return;
- }
-
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- if (slot->type() == Slot::LOOKUP ||
- slot->type() == Slot::CONTEXT ||
- slot->var()->mode() == Variable::CONST ||
- slot->is_arguments()) {
- GetValue();
- return;
- }
-
- // Only non-constant, frame-allocated parameters and locals can
- // reach here. Be careful not to use the optimizations for arguments
- // object access since it may not have been initialized yet.
- ASSERT(!slot->is_arguments());
- if (slot->type() == Slot::PARAMETER) {
- cgen_->frame()->TakeParameterAt(slot->index());
- } else {
- ASSERT(slot->type() == Slot::LOCAL);
- cgen_->frame()->TakeLocalAt(slot->index());
- }
-
- ASSERT(persist_after_get_);
- // Do not unload the reference, because it is used in SetValue.
-}
-
-
-void Reference::SetValue(InitState init_state) {
- ASSERT(cgen_->HasValidEntryRegisters());
- ASSERT(!is_illegal());
- MacroAssembler* masm = cgen_->masm();
- switch (type_) {
- case SLOT: {
- Comment cmnt(masm, "[ Store to Slot");
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- cgen_->StoreToSlot(slot, init_state);
- set_unloaded();
- break;
- }
-
- case NAMED: {
- Comment cmnt(masm, "[ Store to named Property");
- Result answer = cgen_->EmitNamedStore(GetName(), false);
- cgen_->frame()->Push(&answer);
- set_unloaded();
- break;
- }
-
- case KEYED: {
- Comment cmnt(masm, "[ Store to keyed Property");
- Property* property = expression()->AsProperty();
- ASSERT(property != NULL);
-
- Result answer = cgen_->EmitKeyedStore(property->key()->type());
- cgen_->frame()->Push(&answer);
- set_unloaded();
- break;
- }
-
- case UNLOADED:
- case ILLEGAL:
- UNREACHABLE();
- }
-}
-
-
-#undef __
-
#define __ masm.
-
static void MemCopyWrapper(void* dest, const void* src, size_t size) {
memcpy(dest, src, size);
}
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "ast.h"
#include "ic-inl.h"
-#include "jump-target-heavy.h"
namespace v8 {
namespace internal {
// Forward declarations
class CompilationInfo;
-class DeferredCode;
-class FrameRegisterState;
-class RegisterAllocator;
-class RegisterFile;
-class RuntimeCallHelper;
-
-
-// -------------------------------------------------------------------------
-// Reference support
-
-// A reference is a C++ stack-allocated object that puts a
-// reference on the virtual frame. The reference may be consumed
-// by GetValue, TakeValue and SetValue.
-// When the lifetime (scope) of a valid reference ends, it must have
-// been consumed, and be in state UNLOADED.
-class Reference BASE_EMBEDDED {
- public:
- // The values of the types is important, see size().
- enum Type { UNLOADED = -2, ILLEGAL = -1, SLOT = 0, NAMED = 1, KEYED = 2 };
- Reference(CodeGenerator* cgen,
- Expression* expression,
- bool persist_after_get = false);
- ~Reference();
-
- Expression* expression() const { return expression_; }
- Type type() const { return type_; }
- void set_type(Type value) {
- ASSERT_EQ(ILLEGAL, type_);
- type_ = value;
- }
-
- void set_unloaded() {
- ASSERT_NE(ILLEGAL, type_);
- ASSERT_NE(UNLOADED, type_);
- type_ = UNLOADED;
- }
- // The size the reference takes up on the stack.
- int size() const {
- return (type_ < SLOT) ? 0 : type_;
- }
-
- bool is_illegal() const { return type_ == ILLEGAL; }
- bool is_slot() const { return type_ == SLOT; }
- bool is_property() const { return type_ == NAMED || type_ == KEYED; }
- bool is_unloaded() const { return type_ == UNLOADED; }
-
- // Return the name. Only valid for named property references.
- Handle<String> GetName();
-
- // Generate code to push the value of the reference on top of the
- // expression stack. The reference is expected to be already on top of
- // the expression stack, and it is consumed by the call unless the
- // reference is for a compound assignment.
- // If the reference is not consumed, it is left in place under its value.
- void GetValue();
-
- // Like GetValue except that the slot is expected to be written to before
- // being read from again. The value of the reference may be invalidated,
- // causing subsequent attempts to read it to fail.
- void TakeValue();
-
- // Generate code to store the value on top of the expression stack in the
- // reference. The reference is expected to be immediately below the value
- // on the expression stack. The value is stored in the location specified
- // by the reference, and is left on top of the stack, after the reference
- // is popped from beneath it (unloaded).
- void SetValue(InitState init_state);
-
- private:
- CodeGenerator* cgen_;
- Expression* expression_;
- Type type_;
- // Keep the reference on the stack after get, so it can be used by set later.
- bool persist_after_get_;
-};
-
-
-// -------------------------------------------------------------------------
-// Control destinations.
-
-// A control destination encapsulates a pair of jump targets and a
-// flag indicating which one is the preferred fall-through. The
-// preferred fall-through must be unbound, the other may be already
-// bound (ie, a backward target).
-//
-// The true and false targets may be jumped to unconditionally or
-// control may split conditionally. Unconditional jumping and
-// splitting should be emitted in tail position (as the last thing
-// when compiling an expression) because they can cause either label
-// to be bound or the non-fall through to be jumped to leaving an
-// invalid virtual frame.
-//
-// The labels in the control destination can be extracted and
-// manipulated normally without affecting the state of the
-// destination.
-
-class ControlDestination BASE_EMBEDDED {
- public:
- ControlDestination(JumpTarget* true_target,
- JumpTarget* false_target,
- bool true_is_fall_through)
- : true_target_(true_target),
- false_target_(false_target),
- true_is_fall_through_(true_is_fall_through),
- is_used_(false) {
- ASSERT(true_is_fall_through ? !true_target->is_bound()
- : !false_target->is_bound());
- }
-
- // Accessors for the jump targets. Directly jumping or branching to
- // or binding the targets will not update the destination's state.
- JumpTarget* true_target() const { return true_target_; }
- JumpTarget* false_target() const { return false_target_; }
-
- // True if the the destination has been jumped to unconditionally or
- // control has been split to both targets. This predicate does not
- // test whether the targets have been extracted and manipulated as
- // raw jump targets.
- bool is_used() const { return is_used_; }
-
- // True if the destination is used and the true target (respectively
- // false target) was the fall through. If the target is backward,
- // "fall through" included jumping unconditionally to it.
- bool true_was_fall_through() const {
- return is_used_ && true_is_fall_through_;
- }
-
- bool false_was_fall_through() const {
- return is_used_ && !true_is_fall_through_;
- }
-
- // Emit a branch to one of the true or false targets, and bind the
- // other target. Because this binds the fall-through target, it
- // should be emitted in tail position (as the last thing when
- // compiling an expression).
- void Split(Condition cc) {
- ASSERT(!is_used_);
- if (true_is_fall_through_) {
- false_target_->Branch(NegateCondition(cc));
- true_target_->Bind();
- } else {
- true_target_->Branch(cc);
- false_target_->Bind();
- }
- is_used_ = true;
- }
-
- // Emit an unconditional jump in tail position, to the true target
- // (if the argument is true) or the false target. The "jump" will
- // actually bind the jump target if it is forward, jump to it if it
- // is backward.
- void Goto(bool where) {
- ASSERT(!is_used_);
- JumpTarget* target = where ? true_target_ : false_target_;
- if (target->is_bound()) {
- target->Jump();
- } else {
- target->Bind();
- }
- is_used_ = true;
- true_is_fall_through_ = where;
- }
-
- // Mark this jump target as used as if Goto had been called, but
- // without generating a jump or binding a label (the control effect
- // should have already happened). This is used when the left
- // subexpression of the short-circuit boolean operators are
- // compiled.
- void Use(bool where) {
- ASSERT(!is_used_);
- ASSERT((where ? true_target_ : false_target_)->is_bound());
- is_used_ = true;
- true_is_fall_through_ = where;
- }
-
- // Swap the true and false targets but keep the same actual label as
- // the fall through. This is used when compiling negated
- // expressions, where we want to swap the targets but preserve the
- // state.
- void Invert() {
- JumpTarget* temp_target = true_target_;
- true_target_ = false_target_;
- false_target_ = temp_target;
-
- true_is_fall_through_ = !true_is_fall_through_;
- }
-
- private:
- // True and false jump targets.
- JumpTarget* true_target_;
- JumpTarget* false_target_;
-
- // Before using the destination: true if the true target is the
- // preferred fall through, false if the false target is. After
- // using the destination: true if the true target was actually used
- // as the fall through, false if the false target was.
- bool true_is_fall_through_;
-
- // True if the Split or Goto functions have been called.
- bool is_used_;
-};
-
-
-// -------------------------------------------------------------------------
-// Code generation state
-
-// The state is passed down the AST by the code generator (and back up, in
-// the form of the state of the jump target pair). It is threaded through
-// the call stack. Constructing a state implicitly pushes it on the owning
-// code generator's stack of states, and destroying one implicitly pops it.
-//
-// The code generator state is only used for expressions, so statements have
-// the initial state.
-
-class CodeGenState BASE_EMBEDDED {
- public:
- // Create an initial code generator state. Destroying the initial state
- // leaves the code generator with a NULL state.
- explicit CodeGenState(CodeGenerator* owner);
-
- // Create a code generator state based on a code generator's current
- // state. The new state has its own control destination.
- CodeGenState(CodeGenerator* owner, ControlDestination* destination);
-
- // Destroy a code generator state and restore the owning code generator's
- // previous state.
- ~CodeGenState();
-
- // Accessors for the state.
- ControlDestination* destination() const { return destination_; }
-
- private:
- // The owning code generator.
- CodeGenerator* owner_;
-
- // A control destination in case the expression has a control-flow
- // effect.
- ControlDestination* destination_;
-
- // The previous state of the owning code generator, restored when
- // this state is destroyed.
- CodeGenState* previous_;
-};
-
-
-// -------------------------------------------------------------------------
-// Arguments allocation mode.
-
-enum ArgumentsAllocationMode {
- NO_ARGUMENTS_ALLOCATION,
- EAGER_ARGUMENTS_ALLOCATION,
- LAZY_ARGUMENTS_ALLOCATION
-};
-
// -------------------------------------------------------------------------
// CodeGenerator
-class CodeGenerator: public AstVisitor {
+class CodeGenerator {
public:
- static bool MakeCode(CompilationInfo* info);
-
// Printing of AST, etc. as requested by flags.
static void MakeCodePrologue(CompilationInfo* info);
int pos,
bool right_here = false);
- // Accessors
- MacroAssembler* masm() { return masm_; }
- VirtualFrame* frame() const { return frame_; }
- inline Handle<Script> script();
-
- bool has_valid_frame() const { return frame_ != NULL; }
-
- // Set the virtual frame to be new_frame, with non-frame register
- // reference counts given by non_frame_registers. The non-frame
- // register reference counts of the old frame are returned in
- // non_frame_registers.
- void SetFrame(VirtualFrame* new_frame, RegisterFile* non_frame_registers);
-
- void DeleteFrame();
- RegisterAllocator* allocator() const { return allocator_; }
-
- CodeGenState* state() { return state_; }
- void set_state(CodeGenState* state) { state_ = state; }
-
- void AddDeferred(DeferredCode* code) { deferred_.Add(code); }
-
- bool in_spilled_code() const { return in_spilled_code_; }
- void set_in_spilled_code(bool flag) { in_spilled_code_ = flag; }
-
- // Return a position of the element at |index_as_smi| + |additional_offset|
- // in FixedArray pointer to which is held in |array|. |index_as_smi| is Smi.
static Operand FixedArrayElementOperand(Register array,
Register index_as_smi,
int additional_offset = 0) {
}
private:
- // Type of a member function that generates inline code for a native function.
- typedef void (CodeGenerator::*InlineFunctionGenerator)
- (ZoneList<Expression*>*);
-
- static const InlineFunctionGenerator kInlineFunctionGenerators[];
-
- // Construction/Destruction
- explicit CodeGenerator(MacroAssembler* masm);
-
- // Accessors
- inline bool is_eval();
- inline Scope* scope();
- inline bool is_strict_mode();
- inline StrictModeFlag strict_mode_flag();
-
- // Generating deferred code.
- void ProcessDeferred();
-
- // State
- ControlDestination* destination() const { return state_->destination(); }
-
- // Control of side-effect-free int32 expression compilation.
- bool in_safe_int32_mode() { return in_safe_int32_mode_; }
- void set_in_safe_int32_mode(bool value) { in_safe_int32_mode_ = value; }
- bool safe_int32_mode_enabled() {
- return FLAG_safe_int32_compiler && safe_int32_mode_enabled_;
- }
- void set_safe_int32_mode_enabled(bool value) {
- safe_int32_mode_enabled_ = value;
- }
- void set_unsafe_bailout(BreakTarget* unsafe_bailout) {
- unsafe_bailout_ = unsafe_bailout;
- }
-
- // Take the Result that is an untagged int32, and convert it to a tagged
- // Smi or HeapNumber. Remove the untagged_int32 flag from the result.
- void ConvertInt32ResultToNumber(Result* value);
- void ConvertInt32ResultToSmi(Result* value);
-
- // Track loop nesting level.
- int loop_nesting() const { return loop_nesting_; }
- void IncrementLoopNesting() { loop_nesting_++; }
- void DecrementLoopNesting() { loop_nesting_--; }
-
- // Node visitors.
- void VisitStatements(ZoneList<Statement*>* statements);
-
- virtual void VisitSlot(Slot* node);
-#define DEF_VISIT(type) \
- virtual void Visit##type(type* node);
- AST_NODE_LIST(DEF_VISIT)
-#undef DEF_VISIT
-
- // Visit a statement and then spill the virtual frame if control flow can
- // reach the end of the statement (ie, it does not exit via break,
- // continue, return, or throw). This function is used temporarily while
- // the code generator is being transformed.
- void VisitAndSpill(Statement* statement);
-
- // Visit a list of statements and then spill the virtual frame if control
- // flow can reach the end of the list.
- void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
-
- // Main code generation function
- void Generate(CompilationInfo* info);
-
- // Generate the return sequence code. Should be called no more than
- // once per compiled function, immediately after binding the return
- // target (which can not be done more than once).
- void GenerateReturnSequence(Result* return_value);
-
- // Returns the arguments allocation mode.
- ArgumentsAllocationMode ArgumentsMode();
-
- // Store the arguments object and allocate it if necessary.
- Result StoreArgumentsObject(bool initial);
-
- // The following are used by class Reference.
- void LoadReference(Reference* ref);
-
- Operand SlotOperand(Slot* slot, Register tmp);
-
- Operand ContextSlotOperandCheckExtensions(Slot* slot,
- Result tmp,
- JumpTarget* slow);
-
- // Expressions
- void LoadCondition(Expression* expr,
- ControlDestination* destination,
- bool force_control);
- void Load(Expression* expr);
- void LoadGlobal();
- void LoadGlobalReceiver();
-
- // Generate code to push the value of an expression on top of the frame
- // and then spill the frame fully to memory. This function is used
- // temporarily while the code generator is being transformed.
- void LoadAndSpill(Expression* expression);
-
- // Evaluate an expression and place its value on top of the frame,
- // using, or not using, the side-effect-free expression compiler.
- void LoadInSafeInt32Mode(Expression* expr, BreakTarget* unsafe_bailout);
- void LoadWithSafeInt32ModeDisabled(Expression* expr);
-
- // Read a value from a slot and leave it on top of the expression stack.
- void LoadFromSlot(Slot* slot, TypeofState typeof_state);
- void LoadFromSlotCheckForArguments(Slot* slot, TypeofState typeof_state);
- Result LoadFromGlobalSlotCheckExtensions(Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow);
-
- // Support for loading from local/global variables and arguments
- // whose location is known unless they are shadowed by
- // eval-introduced bindings. Generates no code for unsupported slot
- // types and therefore expects to fall through to the slow jump target.
- void EmitDynamicLoadFromSlotFastCase(Slot* slot,
- TypeofState typeof_state,
- Result* result,
- JumpTarget* slow,
- JumpTarget* done);
-
- // Store the value on top of the expression stack into a slot, leaving the
- // value in place.
- void StoreToSlot(Slot* slot, InitState init_state);
-
- // Support for compiling assignment expressions.
- void EmitSlotAssignment(Assignment* node);
- void EmitNamedPropertyAssignment(Assignment* node);
- void EmitKeyedPropertyAssignment(Assignment* node);
-
- // Receiver is passed on the frame and consumed.
- Result EmitNamedLoad(Handle<String> name, bool is_contextual);
-
- // If the store is contextual, value is passed on the frame and consumed.
- // Otherwise, receiver and value are passed on the frame and consumed.
- Result EmitNamedStore(Handle<String> name, bool is_contextual);
-
- // Receiver and key are passed on the frame and consumed.
- Result EmitKeyedLoad();
-
- // Receiver, key, and value are passed on the frame and consumed.
- Result EmitKeyedStore(StaticType* key_type);
-
- // Special code for typeof expressions: Unfortunately, we must
- // be careful when loading the expression in 'typeof'
- // expressions. We are not allowed to throw reference errors for
- // non-existing properties of the global object, so we must make it
- // look like an explicit property access, instead of an access
- // through the context chain.
- void LoadTypeofExpression(Expression* x);
-
- // Translate the value on top of the frame into control flow to the
- // control destination.
- void ToBoolean(ControlDestination* destination);
-
- // Generate code that computes a shortcutting logical operation.
- void GenerateLogicalBooleanOperation(BinaryOperation* node);
-
- void GenericBinaryOperation(BinaryOperation* expr,
- OverwriteMode overwrite_mode);
-
- // Emits code sequence that jumps to a JumpTarget if the inputs
- // are both smis. Cannot be in MacroAssembler because it takes
- // advantage of TypeInfo to skip unneeded checks.
- // Allocates a temporary register, possibly spilling from the frame,
- // if it needs to check both left and right.
- void JumpIfBothSmiUsingTypeInfo(Result* left,
- Result* right,
- JumpTarget* both_smi);
-
- // Emits code sequence that jumps to deferred code if the inputs
- // are not both smis. Cannot be in MacroAssembler because it takes
- // a deferred code object.
- void JumpIfNotBothSmiUsingTypeInfo(Register left,
- Register right,
- Register scratch,
- TypeInfo left_info,
- TypeInfo right_info,
- DeferredCode* deferred);
-
- // Emits code sequence that jumps to the label if the inputs
- // are not both smis.
- void JumpIfNotBothSmiUsingTypeInfo(Register left,
- Register right,
- Register scratch,
- TypeInfo left_info,
- TypeInfo right_info,
- Label* on_non_smi);
-
- // If possible, combine two constant smi values using op to produce
- // a smi result, and push it on the virtual frame, all at compile time.
- // Returns true if it succeeds. Otherwise it has no effect.
- bool FoldConstantSmis(Token::Value op, int left, int right);
-
- // Emit code to perform a binary operation on a constant
- // smi and a likely smi. Consumes the Result operand.
- Result ConstantSmiBinaryOperation(BinaryOperation* expr,
- Result* operand,
- Handle<Object> constant_operand,
- bool reversed,
- OverwriteMode overwrite_mode);
-
- // Emit code to perform a binary operation on two likely smis.
- // The code to handle smi arguments is produced inline.
- // Consumes the Results left and right.
- Result LikelySmiBinaryOperation(BinaryOperation* expr,
- Result* left,
- Result* right,
- OverwriteMode overwrite_mode);
-
-
- // Emit code to perform a binary operation on two untagged int32 values.
- // The values are on top of the frame, and the result is pushed on the frame.
- void Int32BinaryOperation(BinaryOperation* node);
-
-
- // Generate a stub call from the virtual frame.
- Result GenerateGenericBinaryOpStubCall(GenericBinaryOpStub* stub,
- Result* left,
- Result* right);
-
- void Comparison(AstNode* node,
- Condition cc,
- bool strict,
- ControlDestination* destination);
-
- // If at least one of the sides is a constant smi, generate optimized code.
- void ConstantSmiComparison(Condition cc,
- bool strict,
- ControlDestination* destination,
- Result* left_side,
- Result* right_side,
- bool left_side_constant_smi,
- bool right_side_constant_smi,
- bool is_loop_condition);
-
- void GenerateInlineNumberComparison(Result* left_side,
- Result* right_side,
- Condition cc,
- ControlDestination* dest);
-
- // To prevent long attacker-controlled byte sequences, integer constants
- // from the JavaScript source are loaded in two parts if they are larger
- // than 17 bits.
- static const int kMaxSmiInlinedBits = 17;
- bool IsUnsafeSmi(Handle<Object> value);
- // Load an integer constant x into a register target or into the stack using
- // at most 16 bits of user-controlled data per assembly operation.
- void MoveUnsafeSmi(Register target, Handle<Object> value);
- void StoreUnsafeSmiToLocal(int offset, Handle<Object> value);
- void PushUnsafeSmi(Handle<Object> value);
-
- void CallWithArguments(ZoneList<Expression*>* arguments,
- CallFunctionFlags flags,
- int position);
-
- // An optimized implementation of expressions of the form
- // x.apply(y, arguments). We call x the applicand and y the receiver.
- // The optimization avoids allocating an arguments object if possible.
- void CallApplyLazy(Expression* applicand,
- Expression* receiver,
- VariableProxy* arguments,
- int position);
-
- void CheckStack();
-
- bool CheckForInlineRuntimeCall(CallRuntime* node);
-
- void ProcessDeclarations(ZoneList<Declaration*>* declarations);
-
- // Declare global variables and functions in the given array of
- // name/value pairs.
- void DeclareGlobals(Handle<FixedArray> pairs);
-
- // Instantiate the function based on the shared function info.
- Result InstantiateFunction(Handle<SharedFunctionInfo> function_info,
- bool pretenure);
-
- // Support for types.
- void GenerateIsSmi(ZoneList<Expression*>* args);
- void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
- void GenerateIsArray(ZoneList<Expression*>* args);
- void GenerateIsRegExp(ZoneList<Expression*>* args);
- void GenerateIsObject(ZoneList<Expression*>* args);
- void GenerateIsSpecObject(ZoneList<Expression*>* args);
- void GenerateIsFunction(ZoneList<Expression*>* args);
- void GenerateIsUndetectableObject(ZoneList<Expression*>* args);
- void GenerateIsStringWrapperSafeForDefaultValueOf(
- ZoneList<Expression*>* args);
-
- // Support for construct call checks.
- void GenerateIsConstructCall(ZoneList<Expression*>* args);
-
- // Support for arguments.length and arguments[?].
- void GenerateArgumentsLength(ZoneList<Expression*>* args);
- void GenerateArguments(ZoneList<Expression*>* args);
-
- // Support for accessing the class and value fields of an object.
- void GenerateClassOf(ZoneList<Expression*>* args);
- void GenerateValueOf(ZoneList<Expression*>* args);
- void GenerateSetValueOf(ZoneList<Expression*>* args);
-
- // Fast support for charCodeAt(n).
- void GenerateStringCharCodeAt(ZoneList<Expression*>* args);
-
- // Fast support for string.charAt(n) and string[n].
- void GenerateStringCharFromCode(ZoneList<Expression*>* args);
-
- // Fast support for string.charAt(n) and string[n].
- void GenerateStringCharAt(ZoneList<Expression*>* args);
-
- // Fast support for object equality testing.
- void GenerateObjectEquals(ZoneList<Expression*>* args);
-
- void GenerateLog(ZoneList<Expression*>* args);
-
- void GenerateGetFramePointer(ZoneList<Expression*>* args);
-
- // Fast support for Math.random().
- void GenerateRandomHeapNumber(ZoneList<Expression*>* args);
-
- // Fast support for StringAdd.
- void GenerateStringAdd(ZoneList<Expression*>* args);
-
- // Fast support for SubString.
- void GenerateSubString(ZoneList<Expression*>* args);
-
- // Fast support for StringCompare.
- void GenerateStringCompare(ZoneList<Expression*>* args);
-
- // Support for direct calls from JavaScript to native RegExp code.
- void GenerateRegExpExec(ZoneList<Expression*>* args);
-
- // Construct a RegExp exec result with two in-object properties.
- void GenerateRegExpConstructResult(ZoneList<Expression*>* args);
-
- // Support for fast native caches.
- void GenerateGetFromCache(ZoneList<Expression*>* args);
-
- // Fast support for number to string.
- void GenerateNumberToString(ZoneList<Expression*>* args);
-
- // Fast swapping of elements. Takes three expressions, the object and two
- // indices. This should only be used if the indices are known to be
- // non-negative and within bounds of the elements array at the call site.
- void GenerateSwapElements(ZoneList<Expression*>* args);
-
- // Fast call for custom callbacks.
- void GenerateCallFunction(ZoneList<Expression*>* args);
-
- // Fast call to math functions.
- void GenerateMathPow(ZoneList<Expression*>* args);
- void GenerateMathSin(ZoneList<Expression*>* args);
- void GenerateMathCos(ZoneList<Expression*>* args);
- void GenerateMathSqrt(ZoneList<Expression*>* args);
- void GenerateMathLog(ZoneList<Expression*>* args);
-
- // Check whether two RegExps are equivalent.
- void GenerateIsRegExpEquivalent(ZoneList<Expression*>* args);
-
- void GenerateHasCachedArrayIndex(ZoneList<Expression*>* args);
- void GenerateGetCachedArrayIndex(ZoneList<Expression*>* args);
- void GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args);
-
- // Simple condition analysis.
- enum ConditionAnalysis {
- ALWAYS_TRUE,
- ALWAYS_FALSE,
- DONT_KNOW
- };
- ConditionAnalysis AnalyzeCondition(Expression* cond);
-
- // Methods used to indicate which source code is generated for. Source
- // positions are collected by the assembler and emitted with the relocation
- // information.
- void CodeForFunctionPosition(FunctionLiteral* fun);
- void CodeForReturnPosition(FunctionLiteral* fun);
- void CodeForStatementPosition(Statement* stmt);
- void CodeForDoWhileConditionPosition(DoWhileStatement* stmt);
- void CodeForSourcePosition(int pos);
-
- void SetTypeForStackSlot(Slot* slot, TypeInfo info);
-
-#ifdef DEBUG
- // True if the registers are valid for entry to a block. There should
- // be no frame-external references to (non-reserved) registers.
- bool HasValidEntryRegisters();
-#endif
-
- ZoneList<DeferredCode*> deferred_;
-
- // Assembler
- MacroAssembler* masm_; // to generate code
-
- CompilationInfo* info_;
-
- // Code generation state
- VirtualFrame* frame_;
- RegisterAllocator* allocator_;
- CodeGenState* state_;
- int loop_nesting_;
- bool in_safe_int32_mode_;
- bool safe_int32_mode_enabled_;
-
- // Jump targets.
- // The target of the return from the function.
- BreakTarget function_return_;
- // The target of the bailout from a side-effect-free int32 subexpression.
- BreakTarget* unsafe_bailout_;
-
- // True if the function return is shadowed (ie, jumping to the target
- // function_return_ does not jump to the true function return, but rather
- // to some unlinking code).
- bool function_return_is_shadowed_;
-
- // True when we are in code that expects the virtual frame to be fully
- // spilled. Some virtual frame function are disabled in DEBUG builds when
- // called from spilled code, because they do not leave the virtual frame
- // in a spilled state.
- bool in_spilled_code_;
-
- // A cookie that is used for JIT IMM32 Encoding. Initialized to a
- // random number when the command-line
- // FLAG_mask_constants_with_cookie is true, zero otherwise.
- int jit_cookie_;
-
- friend class VirtualFrame;
- friend class Isolate;
- friend class JumpTarget;
- friend class Reference;
- friend class Result;
- friend class FastCodeGenerator;
- friend class FullCodeGenerator;
- friend class FullCodeGenSyntaxChecker;
- friend class LCodeGen;
-
- friend class CodeGeneratorPatcher; // Used in test-log-stack-tracer.cc
- friend class InlineRuntimeFunctionsTable;
-
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_IA32)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
#if defined(V8_TARGET_ARCH_IA32)
#include "code-stubs.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compiler.h"
#include "debug.h"
#include "full-codegen.h"
// Compile all the tests with branches to their bodies.
for (int i = 0; i < clauses->length(); i++) {
CaseClause* clause = clauses->at(i);
- clause->body_target()->entry_label()->Unuse();
+ clause->body_target()->Unuse();
// The default is not a test, but remember it as final fall through.
if (clause->is_default()) {
__ cmp(edx, Operand(eax));
__ j(not_equal, &next_test);
__ Drop(1); // Switch value is no longer needed.
- __ jmp(clause->body_target()->entry_label());
+ __ jmp(clause->body_target());
__ bind(&slow_case);
}
__ test(eax, Operand(eax));
__ j(not_equal, &next_test);
__ Drop(1); // Switch value is no longer needed.
- __ jmp(clause->body_target()->entry_label());
+ __ jmp(clause->body_target());
}
// Discard the test value and jump to the default if present, otherwise to
if (default_clause == NULL) {
__ jmp(nested_statement.break_target());
} else {
- __ jmp(default_clause->body_target()->entry_label());
+ __ jmp(default_clause->body_target());
}
// Compile all the case bodies.
for (int i = 0; i < clauses->length(); i++) {
Comment cmnt(masm_, "[ Case body");
CaseClause* clause = clauses->at(i);
- __ bind(clause->body_target()->entry_label());
+ __ bind(clause->body_target());
PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
VisitStatements(clause->statements());
}
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#if defined(V8_TARGET_ARCH_IA32)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "ic-inl.h"
#include "runtime.h"
#include "stub-cache.h"
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_IA32)
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// JumpTarget implementation.
-
-#define __ ACCESS_MASM(cgen()->masm())
-
-void JumpTarget::DoJump() {
- ASSERT(cgen()->has_valid_frame());
- // Live non-frame registers are not allowed at unconditional jumps
- // because we have no way of invalidating the corresponding results
- // which are still live in the C++ code.
- ASSERT(cgen()->HasValidEntryRegisters());
-
- if (is_bound()) {
- // Backward jump. There is an expected frame to merge to.
- ASSERT(direction_ == BIDIRECTIONAL);
- cgen()->frame()->PrepareMergeTo(entry_frame_);
- cgen()->frame()->MergeTo(entry_frame_);
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- } else if (entry_frame_ != NULL) {
- // Forward jump with a preconfigured entry frame. Assert the
- // current frame matches the expected one and jump to the block.
- ASSERT(cgen()->frame()->Equals(entry_frame_));
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- } else {
- // Forward jump. Remember the current frame and emit a jump to
- // its merge code.
- AddReachingFrame(cgen()->frame());
- RegisterFile empty;
- cgen()->SetFrame(NULL, &empty);
- __ jmp(&merge_labels_.last());
- }
-}
-
-
-void JumpTarget::DoBranch(Condition cc, Hint hint) {
- ASSERT(cgen() != NULL);
- ASSERT(cgen()->has_valid_frame());
-
- if (is_bound()) {
- ASSERT(direction_ == BIDIRECTIONAL);
- // Backward branch. We have an expected frame to merge to on the
- // backward edge.
-
- // Swap the current frame for a copy (we do the swapping to get
- // the off-frame registers off the fall through) to use for the
- // branch.
- VirtualFrame* fall_through_frame = cgen()->frame();
- VirtualFrame* branch_frame = new VirtualFrame(fall_through_frame);
- RegisterFile non_frame_registers;
- cgen()->SetFrame(branch_frame, &non_frame_registers);
-
- // Check if we can avoid merge code.
- cgen()->frame()->PrepareMergeTo(entry_frame_);
- if (cgen()->frame()->Equals(entry_frame_)) {
- // Branch right in to the block.
- cgen()->DeleteFrame();
- __ j(cc, &entry_label_, hint);
- cgen()->SetFrame(fall_through_frame, &non_frame_registers);
- return;
- }
-
- // Check if we can reuse existing merge code.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- if (reaching_frames_[i] != NULL &&
- cgen()->frame()->Equals(reaching_frames_[i])) {
- // Branch to the merge code.
- cgen()->DeleteFrame();
- __ j(cc, &merge_labels_[i], hint);
- cgen()->SetFrame(fall_through_frame, &non_frame_registers);
- return;
- }
- }
-
- // To emit the merge code here, we negate the condition and branch
- // around the merge code on the fall through path.
- Label original_fall_through;
- __ j(NegateCondition(cc), &original_fall_through, NegateHint(hint));
- cgen()->frame()->MergeTo(entry_frame_);
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- cgen()->SetFrame(fall_through_frame, &non_frame_registers);
- __ bind(&original_fall_through);
-
- } else if (entry_frame_ != NULL) {
- // Forward branch with a preconfigured entry frame. Assert the
- // current frame matches the expected one and branch to the block.
- ASSERT(cgen()->frame()->Equals(entry_frame_));
- // Explicitly use the macro assembler instead of __ as forward
- // branches are expected to be a fixed size (no inserted
- // coverage-checking instructions please). This is used in
- // Reference::GetValue.
- cgen()->masm()->j(cc, &entry_label_, hint);
-
- } else {
- // Forward branch. A copy of the current frame is remembered and
- // a branch to the merge code is emitted. Explicitly use the
- // macro assembler instead of __ as forward branches are expected
- // to be a fixed size (no inserted coverage-checking instructions
- // please). This is used in Reference::GetValue.
- AddReachingFrame(new VirtualFrame(cgen()->frame()));
- cgen()->masm()->j(cc, &merge_labels_.last(), hint);
- }
-}
-
-
-void JumpTarget::Call() {
- // Call is used to push the address of the catch block on the stack as
- // a return address when compiling try/catch and try/finally. We
- // fully spill the frame before making the call. The expected frame
- // at the label (which should be the only one) is the spilled current
- // frame plus an in-memory return address. The "fall-through" frame
- // at the return site is the spilled current frame.
- ASSERT(cgen() != NULL);
- ASSERT(cgen()->has_valid_frame());
- // There are no non-frame references across the call.
- ASSERT(cgen()->HasValidEntryRegisters());
- ASSERT(!is_linked());
-
- cgen()->frame()->SpillAll();
- VirtualFrame* target_frame = new VirtualFrame(cgen()->frame());
- target_frame->Adjust(1);
- // We do not expect a call with a preconfigured entry frame.
- ASSERT(entry_frame_ == NULL);
- AddReachingFrame(target_frame);
- __ call(&merge_labels_.last());
-}
-
-
-void JumpTarget::DoBind() {
- ASSERT(cgen() != NULL);
- ASSERT(!is_bound());
-
- // Live non-frame registers are not allowed at the start of a basic
- // block.
- ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
-
- // Fast case: the jump target was manually configured with an entry
- // frame to use.
- if (entry_frame_ != NULL) {
- // Assert no reaching frames to deal with.
- ASSERT(reaching_frames_.is_empty());
- ASSERT(!cgen()->has_valid_frame());
-
- RegisterFile empty;
- if (direction_ == BIDIRECTIONAL) {
- // Copy the entry frame so the original can be used for a
- // possible backward jump.
- cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
- } else {
- // Take ownership of the entry frame.
- cgen()->SetFrame(entry_frame_, &empty);
- entry_frame_ = NULL;
- }
- __ bind(&entry_label_);
- return;
- }
-
- if (!is_linked()) {
- ASSERT(cgen()->has_valid_frame());
- if (direction_ == FORWARD_ONLY) {
- // Fast case: no forward jumps and no possible backward jumps.
- // The stack pointer can be floating above the top of the
- // virtual frame before the bind. Afterward, it should not.
- VirtualFrame* frame = cgen()->frame();
- int difference = frame->stack_pointer_ - (frame->element_count() - 1);
- if (difference > 0) {
- frame->stack_pointer_ -= difference;
- __ add(Operand(esp), Immediate(difference * kPointerSize));
- }
- } else {
- ASSERT(direction_ == BIDIRECTIONAL);
- // Fast case: no forward jumps, possible backward ones. Remove
- // constants and copies above the watermark on the fall-through
- // frame and use it as the entry frame.
- cgen()->frame()->MakeMergable();
- entry_frame_ = new VirtualFrame(cgen()->frame());
- }
- __ bind(&entry_label_);
- return;
- }
-
- if (direction_ == FORWARD_ONLY &&
- !cgen()->has_valid_frame() &&
- reaching_frames_.length() == 1) {
- // Fast case: no fall-through, a single forward jump, and no
- // possible backward jumps. Pick up the only reaching frame, take
- // ownership of it, and use it for the block about to be emitted.
- VirtualFrame* frame = reaching_frames_[0];
- RegisterFile empty;
- cgen()->SetFrame(frame, &empty);
- reaching_frames_[0] = NULL;
- __ bind(&merge_labels_[0]);
-
- // The stack pointer can be floating above the top of the
- // virtual frame before the bind. Afterward, it should not.
- int difference = frame->stack_pointer_ - (frame->element_count() - 1);
- if (difference > 0) {
- frame->stack_pointer_ -= difference;
- __ add(Operand(esp), Immediate(difference * kPointerSize));
- }
-
- __ bind(&entry_label_);
- return;
- }
-
- // If there is a current frame, record it as the fall-through. It
- // is owned by the reaching frames for now.
- bool had_fall_through = false;
- if (cgen()->has_valid_frame()) {
- had_fall_through = true;
- AddReachingFrame(cgen()->frame()); // Return value ignored.
- RegisterFile empty;
- cgen()->SetFrame(NULL, &empty);
- }
-
- // Compute the frame to use for entry to the block.
- ComputeEntryFrame();
-
- // Some moves required to merge to an expected frame require purely
- // frame state changes, and do not require any code generation.
- // Perform those first to increase the possibility of finding equal
- // frames below.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- if (reaching_frames_[i] != NULL) {
- reaching_frames_[i]->PrepareMergeTo(entry_frame_);
- }
- }
-
- if (is_linked()) {
- // There were forward jumps. Handle merging the reaching frames
- // to the entry frame.
-
- // Loop over the (non-null) reaching frames and process any that
- // need merge code. Iterate backwards through the list to handle
- // the fall-through frame first. Set frames that will be
- // processed after 'i' to NULL if we want to avoid processing
- // them.
- for (int i = reaching_frames_.length() - 1; i >= 0; i--) {
- VirtualFrame* frame = reaching_frames_[i];
-
- if (frame != NULL) {
- // Does the frame (probably) need merge code?
- if (!frame->Equals(entry_frame_)) {
- // We could have a valid frame as the fall through to the
- // binding site or as the fall through from a previous merge
- // code block. Jump around the code we are about to
- // generate.
- if (cgen()->has_valid_frame()) {
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- }
- // Pick up the frame for this block. Assume ownership if
- // there cannot be backward jumps.
- RegisterFile empty;
- if (direction_ == BIDIRECTIONAL) {
- cgen()->SetFrame(new VirtualFrame(frame), &empty);
- } else {
- cgen()->SetFrame(frame, &empty);
- reaching_frames_[i] = NULL;
- }
- __ bind(&merge_labels_[i]);
-
- // Loop over the remaining (non-null) reaching frames,
- // looking for any that can share merge code with this one.
- for (int j = 0; j < i; j++) {
- VirtualFrame* other = reaching_frames_[j];
- if (other != NULL && other->Equals(cgen()->frame())) {
- // Set the reaching frame element to null to avoid
- // processing it later, and then bind its entry label.
- reaching_frames_[j] = NULL;
- __ bind(&merge_labels_[j]);
- }
- }
-
- // Emit the merge code.
- cgen()->frame()->MergeTo(entry_frame_);
- } else if (i == reaching_frames_.length() - 1 && had_fall_through) {
- // If this is the fall through frame, and it didn't need
- // merge code, we need to pick up the frame so we can jump
- // around subsequent merge blocks if necessary.
- RegisterFile empty;
- cgen()->SetFrame(frame, &empty);
- reaching_frames_[i] = NULL;
- }
- }
- }
-
- // The code generator may not have a current frame if there was no
- // fall through and none of the reaching frames needed merging.
- // In that case, clone the entry frame as the current frame.
- if (!cgen()->has_valid_frame()) {
- RegisterFile empty;
- cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
- }
-
- // There may be unprocessed reaching frames that did not need
- // merge code. They will have unbound merge labels. Bind their
- // merge labels to be the same as the entry label and deallocate
- // them.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- if (!merge_labels_[i].is_bound()) {
- reaching_frames_[i] = NULL;
- __ bind(&merge_labels_[i]);
- }
- }
-
- // There are non-NULL reaching frames with bound labels for each
- // merge block, but only on backward targets.
- } else {
- // There were no forward jumps. There must be a current frame and
- // this must be a bidirectional target.
- ASSERT(reaching_frames_.length() == 1);
- ASSERT(reaching_frames_[0] != NULL);
- ASSERT(direction_ == BIDIRECTIONAL);
-
- // Use a copy of the reaching frame so the original can be saved
- // for possible reuse as a backward merge block.
- RegisterFile empty;
- cgen()->SetFrame(new VirtualFrame(reaching_frames_[0]), &empty);
- __ bind(&merge_labels_[0]);
- cgen()->frame()->MergeTo(entry_frame_);
- }
-
- __ bind(&entry_label_);
-}
-
-
-void BreakTarget::Jump() {
- // Drop leftover statement state from the frame before merging, without
- // emitting code.
- ASSERT(cgen()->has_valid_frame());
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- DoJump();
-}
-
-
-void BreakTarget::Jump(Result* arg) {
- // Drop leftover statement state from the frame before merging, without
- // emitting code.
- ASSERT(cgen()->has_valid_frame());
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- cgen()->frame()->Push(arg);
- DoJump();
-}
-
-
-void BreakTarget::Bind() {
-#ifdef DEBUG
- // All the forward-reaching frames should have been adjusted at the
- // jumps to this target.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- ASSERT(reaching_frames_[i] == NULL ||
- reaching_frames_[i]->height() == expected_height_);
- }
-#endif
- // Drop leftover statement state from the frame before merging, even on
- // the fall through. This is so we can bind the return target with state
- // on the frame.
- if (cgen()->has_valid_frame()) {
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- }
- DoBind();
-}
-
-
-void BreakTarget::Bind(Result* arg) {
-#ifdef DEBUG
- // All the forward-reaching frames should have been adjusted at the
- // jumps to this target.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- ASSERT(reaching_frames_[i] == NULL ||
- reaching_frames_[i]->height() == expected_height_ + 1);
- }
-#endif
- // Drop leftover statement state from the frame before merging, even on
- // the fall through. This is so we can bind the return target with state
- // on the frame.
- if (cgen()->has_valid_frame()) {
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- cgen()->frame()->Push(arg);
- }
- DoBind();
- *arg = cgen()->frame()->Pop();
-}
-
-
-#undef __
-
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_IA32
#if defined(V8_TARGET_ARCH_IA32)
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "debug.h"
#include "runtime.h"
#include "serialize.h"
}
-void MacroAssembler::NegativeZeroTest(CodeGenerator* cgen,
- Register result,
- Register op,
- JumpTarget* then_target) {
- JumpTarget ok;
- test(result, Operand(result));
- ok.Branch(not_zero, taken);
- test(op, Operand(op));
- then_target->Branch(sign, not_taken);
- ok.Bind();
-}
-
-
void MacroAssembler::NegativeZeroTest(Register result,
Register op,
Label* then_label) {
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
typedef Operand MemOperand;
// Forward declaration.
-class JumpTarget;
class PostCallGenerator;
// MacroAssembler implements a collection of frequently used macros.
// Check if result is zero and op is negative.
void NegativeZeroTest(Register result, Register op, Label* then_label);
- // Check if result is zero and op is negative in code using jump targets.
- void NegativeZeroTest(CodeGenerator* cgen,
- Register result,
- Register op,
- JumpTarget* then_target);
-
// Check if result is zero and any of op1 and op2 are negative.
// Register scratch is destroyed, and it must be different from op2.
void NegativeZeroTest(Register result, Register op1, Register op2,
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_
-#define V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_
-
-#include "v8.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-bool RegisterAllocator::IsReserved(Register reg) {
- // The code for this test relies on the order of register codes.
- return reg.code() >= esp.code() && reg.code() <= esi.code();
-}
-
-
-// The register allocator uses small integers to represent the
-// non-reserved assembler registers. The mapping is:
-
-// eax <-> 0, ebx <-> 1, ecx <-> 2, edx <-> 3, edi <-> 4.
-
-int RegisterAllocator::ToNumber(Register reg) {
- ASSERT(reg.is_valid() && !IsReserved(reg));
- const int kNumbers[] = {
- 0, // eax
- 2, // ecx
- 3, // edx
- 1, // ebx
- -1, // esp
- -1, // ebp
- -1, // esi
- 4 // edi
- };
- return kNumbers[reg.code()];
-}
-
-
-Register RegisterAllocator::ToRegister(int num) {
- ASSERT(num >= 0 && num < kNumRegisters);
- const Register kRegisters[] = { eax, ebx, ecx, edx, edi };
- return kRegisters[num];
-}
-
-
-void RegisterAllocator::Initialize() {
- Reset();
- // The non-reserved edi register is live on JS function entry.
- Use(edi); // JS function.
-}
-
-
-} } // namespace v8::internal
-
-#endif // V8_IA32_REGISTER_ALLOCATOR_IA32_INL_H_
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_IA32)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Result implementation.
-
-void Result::ToRegister() {
- ASSERT(is_valid());
- if (is_constant()) {
- CodeGenerator* code_generator =
- CodeGeneratorScope::Current(Isolate::Current());
- Result fresh = code_generator->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- if (is_untagged_int32()) {
- fresh.set_untagged_int32(true);
- if (handle()->IsSmi()) {
- code_generator->masm()->Set(
- fresh.reg(),
- Immediate(Smi::cast(*handle())->value()));
- } else if (handle()->IsHeapNumber()) {
- double double_value = HeapNumber::cast(*handle())->value();
- int32_t value = DoubleToInt32(double_value);
- if (double_value == 0 && signbit(double_value)) {
- // Negative zero must not be converted to an int32 unless
- // the context allows it.
- code_generator->unsafe_bailout_->Branch(equal);
- code_generator->unsafe_bailout_->Branch(not_equal);
- } else if (double_value == value) {
- code_generator->masm()->Set(fresh.reg(), Immediate(value));
- } else {
- code_generator->unsafe_bailout_->Branch(equal);
- code_generator->unsafe_bailout_->Branch(not_equal);
- }
- } else {
- // Constant is not a number. This was not predicted by AST analysis.
- code_generator->unsafe_bailout_->Branch(equal);
- code_generator->unsafe_bailout_->Branch(not_equal);
- }
- } else if (code_generator->IsUnsafeSmi(handle())) {
- code_generator->MoveUnsafeSmi(fresh.reg(), handle());
- } else {
- code_generator->masm()->Set(fresh.reg(), Immediate(handle()));
- }
- // This result becomes a copy of the fresh one.
- fresh.set_type_info(type_info());
- *this = fresh;
- }
- ASSERT(is_register());
-}
-
-
-void Result::ToRegister(Register target) {
- CodeGenerator* code_generator =
- CodeGeneratorScope::Current(Isolate::Current());
- ASSERT(is_valid());
- if (!is_register() || !reg().is(target)) {
- Result fresh = code_generator->allocator()->Allocate(target);
- ASSERT(fresh.is_valid());
- if (is_register()) {
- code_generator->masm()->mov(fresh.reg(), reg());
- } else {
- ASSERT(is_constant());
- if (is_untagged_int32()) {
- if (handle()->IsSmi()) {
- code_generator->masm()->Set(
- fresh.reg(),
- Immediate(Smi::cast(*handle())->value()));
- } else {
- ASSERT(handle()->IsHeapNumber());
- double double_value = HeapNumber::cast(*handle())->value();
- int32_t value = DoubleToInt32(double_value);
- if (double_value == 0 && signbit(double_value)) {
- // Negative zero must not be converted to an int32 unless
- // the context allows it.
- code_generator->unsafe_bailout_->Branch(equal);
- code_generator->unsafe_bailout_->Branch(not_equal);
- } else if (double_value == value) {
- code_generator->masm()->Set(fresh.reg(), Immediate(value));
- } else {
- code_generator->unsafe_bailout_->Branch(equal);
- code_generator->unsafe_bailout_->Branch(not_equal);
- }
- }
- } else {
- if (code_generator->IsUnsafeSmi(handle())) {
- code_generator->MoveUnsafeSmi(fresh.reg(), handle());
- } else {
- code_generator->masm()->Set(fresh.reg(), Immediate(handle()));
- }
- }
- }
- fresh.set_type_info(type_info());
- fresh.set_untagged_int32(is_untagged_int32());
- *this = fresh;
- } else if (is_register() && reg().is(target)) {
- ASSERT(code_generator->has_valid_frame());
- code_generator->frame()->Spill(target);
- ASSERT(code_generator->allocator()->count(target) == 1);
- }
- ASSERT(is_register());
- ASSERT(reg().is(target));
-}
-
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
- Result result = AllocateWithoutSpilling();
- // Check that the register is a byte register. If not, unuse the
- // register if valid and return an invalid result.
- if (result.is_valid() && !result.reg().is_byte_register()) {
- result.Unuse();
- return Result();
- }
- return result;
-}
-
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_IA32
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_IA32_REGISTER_ALLOCATOR_IA32_H_
-#define V8_IA32_REGISTER_ALLOCATOR_IA32_H_
-
-namespace v8 {
-namespace internal {
-
-class RegisterAllocatorConstants : public AllStatic {
- public:
- static const int kNumRegisters = 5;
- static const int kInvalidRegister = -1;
-};
-
-
-} } // namespace v8::internal
-
-#endif // V8_IA32_REGISTER_ALLOCATOR_IA32_H_
#if defined(V8_TARGET_ARCH_IA32)
#include "ic-inl.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "stub-cache.h"
namespace v8 {
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_IA32)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "scopes.h"
-#include "virtual-frame-inl.h"
-#include "stub-cache.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm())
-
-void VirtualFrame::SyncElementBelowStackPointer(int index) {
- // Emit code to write elements below the stack pointer to their
- // (already allocated) stack address.
- ASSERT(index <= stack_pointer_);
- FrameElement element = elements_[index];
- ASSERT(!element.is_synced());
- switch (element.type()) {
- case FrameElement::INVALID:
- break;
-
- case FrameElement::MEMORY:
- // This function should not be called with synced elements.
- // (memory elements are always synced).
- UNREACHABLE();
- break;
-
- case FrameElement::REGISTER:
- __ mov(Operand(ebp, fp_relative(index)), element.reg());
- break;
-
- case FrameElement::CONSTANT:
- if (cgen()->IsUnsafeSmi(element.handle())) {
- cgen()->StoreUnsafeSmiToLocal(fp_relative(index), element.handle());
- } else {
- __ Set(Operand(ebp, fp_relative(index)),
- Immediate(element.handle()));
- }
- break;
-
- case FrameElement::COPY: {
- int backing_index = element.index();
- FrameElement backing_element = elements_[backing_index];
- if (backing_element.is_memory()) {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), Operand(ebp, fp_relative(backing_index)));
- __ mov(Operand(ebp, fp_relative(index)), temp.reg());
- } else {
- ASSERT(backing_element.is_register());
- __ mov(Operand(ebp, fp_relative(index)), backing_element.reg());
- }
- break;
- }
- }
- elements_[index].set_sync();
-}
-
-
-void VirtualFrame::SyncElementByPushing(int index) {
- // Sync an element of the frame that is just above the stack pointer
- // by pushing it.
- ASSERT(index == stack_pointer_ + 1);
- stack_pointer_++;
- FrameElement element = elements_[index];
-
- switch (element.type()) {
- case FrameElement::INVALID:
- __ push(Immediate(Smi::FromInt(0)));
- break;
-
- case FrameElement::MEMORY:
- // No memory elements exist above the stack pointer.
- UNREACHABLE();
- break;
-
- case FrameElement::REGISTER:
- __ push(element.reg());
- break;
-
- case FrameElement::CONSTANT:
- if (cgen()->IsUnsafeSmi(element.handle())) {
- cgen()->PushUnsafeSmi(element.handle());
- } else {
- __ push(Immediate(element.handle()));
- }
- break;
-
- case FrameElement::COPY: {
- int backing_index = element.index();
- FrameElement backing = elements_[backing_index];
- ASSERT(backing.is_memory() || backing.is_register());
- if (backing.is_memory()) {
- __ push(Operand(ebp, fp_relative(backing_index)));
- } else {
- __ push(backing.reg());
- }
- break;
- }
- }
- elements_[index].set_sync();
-}
-
-
-// Clear the dirty bits for the range of elements in
-// [min(stack_pointer_ + 1,begin), end].
-void VirtualFrame::SyncRange(int begin, int end) {
- ASSERT(begin >= 0);
- ASSERT(end < element_count());
- // Sync elements below the range if they have not been materialized
- // on the stack.
- int start = Min(begin, stack_pointer_ + 1);
-
- // Emit normal push instructions for elements above stack pointer
- // and use mov instructions if we are below stack pointer.
- for (int i = start; i <= end; i++) {
- if (!elements_[i].is_synced()) {
- if (i <= stack_pointer_) {
- SyncElementBelowStackPointer(i);
- } else {
- SyncElementByPushing(i);
- }
- }
- }
-}
-
-
-void VirtualFrame::MakeMergable() {
- for (int i = 0; i < element_count(); i++) {
- FrameElement element = elements_[i];
-
- // All number type information is reset to unknown for a mergable frame
- // because of incoming back edges.
- if (element.is_constant() || element.is_copy()) {
- if (element.is_synced()) {
- // Just spill.
- elements_[i] = FrameElement::MemoryElement(TypeInfo::Unknown());
- } else {
- // Allocate to a register.
- FrameElement backing_element; // Invalid if not a copy.
- if (element.is_copy()) {
- backing_element = elements_[element.index()];
- }
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid()); // A register was spilled if all were in use.
- elements_[i] =
- FrameElement::RegisterElement(fresh.reg(),
- FrameElement::NOT_SYNCED,
- TypeInfo::Unknown());
- Use(fresh.reg(), i);
-
- // Emit a move.
- if (element.is_constant()) {
- if (cgen()->IsUnsafeSmi(element.handle())) {
- cgen()->MoveUnsafeSmi(fresh.reg(), element.handle());
- } else {
- __ Set(fresh.reg(), Immediate(element.handle()));
- }
- } else {
- ASSERT(element.is_copy());
- // Copies are only backed by register or memory locations.
- if (backing_element.is_register()) {
- // The backing store may have been spilled by allocating,
- // but that's OK. If it was, the value is right where we
- // want it.
- if (!fresh.reg().is(backing_element.reg())) {
- __ mov(fresh.reg(), backing_element.reg());
- }
- } else {
- ASSERT(backing_element.is_memory());
- __ mov(fresh.reg(), Operand(ebp, fp_relative(element.index())));
- }
- }
- }
- // No need to set the copied flag --- there are no copies.
- } else {
- // Clear the copy flag of non-constant, non-copy elements.
- // They cannot be copied because copies are not allowed.
- // The copy flag is not relied on before the end of this loop,
- // including when registers are spilled.
- elements_[i].clear_copied();
- elements_[i].set_type_info(TypeInfo::Unknown());
- }
- }
-}
-
-
-void VirtualFrame::MergeTo(VirtualFrame* expected) {
- Comment cmnt(masm(), "[ Merge frame");
- // We should always be merging the code generator's current frame to an
- // expected frame.
- ASSERT(cgen()->frame() == this);
-
- // Adjust the stack pointer upward (toward the top of the virtual
- // frame) if necessary.
- if (stack_pointer_ < expected->stack_pointer_) {
- int difference = expected->stack_pointer_ - stack_pointer_;
- stack_pointer_ = expected->stack_pointer_;
- __ sub(Operand(esp), Immediate(difference * kPointerSize));
- }
-
- MergeMoveRegistersToMemory(expected);
- MergeMoveRegistersToRegisters(expected);
- MergeMoveMemoryToRegisters(expected);
-
- // Adjust the stack pointer downward if necessary.
- if (stack_pointer_ > expected->stack_pointer_) {
- int difference = stack_pointer_ - expected->stack_pointer_;
- stack_pointer_ = expected->stack_pointer_;
- __ add(Operand(esp), Immediate(difference * kPointerSize));
- }
-
- // At this point, the frames should be identical.
- ASSERT(Equals(expected));
-}
-
-
-void VirtualFrame::MergeMoveRegistersToMemory(VirtualFrame* expected) {
- ASSERT(stack_pointer_ >= expected->stack_pointer_);
-
- // Move registers, constants, and copies to memory. Perform moves
- // from the top downward in the frame in order to leave the backing
- // stores of copies in registers.
- //
- // Moving memory-backed copies to memory requires a spare register
- // for the memory-to-memory moves. Since we are performing a merge,
- // we use esi (which is already saved in the frame). We keep track
- // of the index of the frame element esi is caching or kIllegalIndex
- // if esi has not been disturbed.
- int esi_caches = kIllegalIndex;
- for (int i = element_count() - 1; i >= 0; i--) {
- FrameElement target = expected->elements_[i];
- if (target.is_register()) continue; // Handle registers later.
- if (target.is_memory()) {
- FrameElement source = elements_[i];
- switch (source.type()) {
- case FrameElement::INVALID:
- // Not a legal merge move.
- UNREACHABLE();
- break;
-
- case FrameElement::MEMORY:
- // Already in place.
- break;
-
- case FrameElement::REGISTER:
- Unuse(source.reg());
- if (!source.is_synced()) {
- __ mov(Operand(ebp, fp_relative(i)), source.reg());
- }
- break;
-
- case FrameElement::CONSTANT:
- if (!source.is_synced()) {
- if (cgen()->IsUnsafeSmi(source.handle())) {
- esi_caches = i;
- cgen()->MoveUnsafeSmi(esi, source.handle());
- __ mov(Operand(ebp, fp_relative(i)), esi);
- } else {
- __ Set(Operand(ebp, fp_relative(i)), Immediate(source.handle()));
- }
- }
- break;
-
- case FrameElement::COPY:
- if (!source.is_synced()) {
- int backing_index = source.index();
- FrameElement backing_element = elements_[backing_index];
- if (backing_element.is_memory()) {
- // If we have to spill a register, we spill esi.
- if (esi_caches != backing_index) {
- esi_caches = backing_index;
- __ mov(esi, Operand(ebp, fp_relative(backing_index)));
- }
- __ mov(Operand(ebp, fp_relative(i)), esi);
- } else {
- ASSERT(backing_element.is_register());
- __ mov(Operand(ebp, fp_relative(i)), backing_element.reg());
- }
- }
- break;
- }
- }
- elements_[i] = target;
- }
-
- if (esi_caches != kIllegalIndex) {
- __ mov(esi, Operand(ebp, fp_relative(context_index())));
- }
-}
-
-
-void VirtualFrame::MergeMoveRegistersToRegisters(VirtualFrame* expected) {
- // We have already done X-to-memory moves.
- ASSERT(stack_pointer_ >= expected->stack_pointer_);
-
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- // Move the right value into register i if it is currently in a register.
- int index = expected->register_location(i);
- int use_index = register_location(i);
- // Skip if register i is unused in the target or else if source is
- // not a register (this is not a register-to-register move).
- if (index == kIllegalIndex || !elements_[index].is_register()) continue;
-
- Register target = RegisterAllocator::ToRegister(i);
- Register source = elements_[index].reg();
- if (index != use_index) {
- if (use_index == kIllegalIndex) { // Target is currently unused.
- // Copy contents of source from source to target.
- // Set frame element register to target.
- Use(target, index);
- Unuse(source);
- __ mov(target, source);
- } else {
- // Exchange contents of registers source and target.
- // Nothing except the register backing use_index has changed.
- elements_[use_index].set_reg(source);
- set_register_location(target, index);
- set_register_location(source, use_index);
- __ xchg(source, target);
- }
- }
-
- if (!elements_[index].is_synced() &&
- expected->elements_[index].is_synced()) {
- __ mov(Operand(ebp, fp_relative(index)), target);
- }
- elements_[index] = expected->elements_[index];
- }
-}
-
-
-void VirtualFrame::MergeMoveMemoryToRegisters(VirtualFrame* expected) {
- // Move memory, constants, and copies to registers. This is the
- // final step and since it is not done from the bottom up, but in
- // register code order, we have special code to ensure that the backing
- // elements of copies are in their correct locations when we
- // encounter the copies.
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- int index = expected->register_location(i);
- if (index != kIllegalIndex) {
- FrameElement source = elements_[index];
- FrameElement target = expected->elements_[index];
- Register target_reg = RegisterAllocator::ToRegister(i);
- ASSERT(target.reg().is(target_reg));
- switch (source.type()) {
- case FrameElement::INVALID: // Fall through.
- UNREACHABLE();
- break;
- case FrameElement::REGISTER:
- ASSERT(source.Equals(target));
- // Go to next iteration. Skips Use(target_reg) and syncing
- // below. It is safe to skip syncing because a target
- // register frame element would only be synced if all source
- // elements were.
- continue;
- break;
- case FrameElement::MEMORY:
- ASSERT(index <= stack_pointer_);
- __ mov(target_reg, Operand(ebp, fp_relative(index)));
- break;
-
- case FrameElement::CONSTANT:
- if (cgen()->IsUnsafeSmi(source.handle())) {
- cgen()->MoveUnsafeSmi(target_reg, source.handle());
- } else {
- __ Set(target_reg, Immediate(source.handle()));
- }
- break;
-
- case FrameElement::COPY: {
- int backing_index = source.index();
- FrameElement backing = elements_[backing_index];
- ASSERT(backing.is_memory() || backing.is_register());
- if (backing.is_memory()) {
- ASSERT(backing_index <= stack_pointer_);
- // Code optimization if backing store should also move
- // to a register: move backing store to its register first.
- if (expected->elements_[backing_index].is_register()) {
- FrameElement new_backing = expected->elements_[backing_index];
- Register new_backing_reg = new_backing.reg();
- ASSERT(!is_used(new_backing_reg));
- elements_[backing_index] = new_backing;
- Use(new_backing_reg, backing_index);
- __ mov(new_backing_reg,
- Operand(ebp, fp_relative(backing_index)));
- __ mov(target_reg, new_backing_reg);
- } else {
- __ mov(target_reg, Operand(ebp, fp_relative(backing_index)));
- }
- } else {
- __ mov(target_reg, backing.reg());
- }
- }
- }
- // Ensure the proper sync state.
- if (target.is_synced() && !source.is_synced()) {
- __ mov(Operand(ebp, fp_relative(index)), target_reg);
- }
- Use(target_reg, index);
- elements_[index] = target;
- }
- }
-}
-
-
-void VirtualFrame::Enter() {
- // Registers live on entry: esp, ebp, esi, edi.
- Comment cmnt(masm(), "[ Enter JS frame");
-
-#ifdef DEBUG
- if (FLAG_debug_code) {
- // Verify that edi contains a JS function. The following code
- // relies on eax being available for use.
- __ test(edi, Immediate(kSmiTagMask));
- __ Check(not_zero,
- "VirtualFrame::Enter - edi is not a function (smi check).");
- __ CmpObjectType(edi, JS_FUNCTION_TYPE, eax);
- __ Check(equal,
- "VirtualFrame::Enter - edi is not a function (map check).");
- }
-#endif
-
- EmitPush(ebp);
-
- __ mov(ebp, Operand(esp));
-
- // Store the context in the frame. The context is kept in esi and a
- // copy is stored in the frame. The external reference to esi
- // remains.
- EmitPush(esi);
-
- // Store the function in the frame. The frame owns the register
- // reference now (ie, it can keep it in edi or spill it later).
- Push(edi);
- SyncElementAt(element_count() - 1);
- cgen()->allocator()->Unuse(edi);
-}
-
-
-void VirtualFrame::Exit() {
- Comment cmnt(masm(), "[ Exit JS frame");
- // Record the location of the JS exit code for patching when setting
- // break point.
- __ RecordJSReturn();
-
- // Avoid using the leave instruction here, because it is too
- // short. We need the return sequence to be a least the size of a
- // call instruction to support patching the exit code in the
- // debugger. See VisitReturnStatement for the full return sequence.
- __ mov(esp, Operand(ebp));
- stack_pointer_ = frame_pointer();
- for (int i = element_count() - 1; i > stack_pointer_; i--) {
- FrameElement last = elements_.RemoveLast();
- if (last.is_register()) {
- Unuse(last.reg());
- }
- }
-
- EmitPop(ebp);
-}
-
-
-void VirtualFrame::AllocateStackSlots() {
- int count = local_count();
- if (count > 0) {
- Comment cmnt(masm(), "[ Allocate space for locals");
- // The locals are initialized to a constant (the undefined value), but
- // we sync them with the actual frame to allocate space for spilling
- // them later. First sync everything above the stack pointer so we can
- // use pushes to allocate and initialize the locals.
- SyncRange(stack_pointer_ + 1, element_count() - 1);
- Handle<Object> undefined = FACTORY->undefined_value();
- FrameElement initial_value =
- FrameElement::ConstantElement(undefined, FrameElement::SYNCED);
- if (count == 1) {
- __ push(Immediate(undefined));
- } else if (count < kLocalVarBound) {
- // For less locals the unrolled loop is more compact.
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ Set(temp.reg(), Immediate(undefined));
- for (int i = 0; i < count; i++) {
- __ push(temp.reg());
- }
- } else {
- // For more locals a loop in generated code is more compact.
- Label alloc_locals_loop;
- Result cnt = cgen()->allocator()->Allocate();
- Result tmp = cgen()->allocator()->Allocate();
- ASSERT(cnt.is_valid());
- ASSERT(tmp.is_valid());
- __ mov(cnt.reg(), Immediate(count));
- __ mov(tmp.reg(), Immediate(undefined));
- __ bind(&alloc_locals_loop);
- __ push(tmp.reg());
- __ dec(cnt.reg());
- __ j(not_zero, &alloc_locals_loop);
- }
- for (int i = 0; i < count; i++) {
- elements_.Add(initial_value);
- stack_pointer_++;
- }
- }
-}
-
-
-void VirtualFrame::SaveContextRegister() {
- ASSERT(elements_[context_index()].is_memory());
- __ mov(Operand(ebp, fp_relative(context_index())), esi);
-}
-
-
-void VirtualFrame::RestoreContextRegister() {
- ASSERT(elements_[context_index()].is_memory());
- __ mov(esi, Operand(ebp, fp_relative(context_index())));
-}
-
-
-void VirtualFrame::PushReceiverSlotAddress() {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ lea(temp.reg(), ParameterAt(-1));
- Push(&temp);
-}
-
-
-int VirtualFrame::InvalidateFrameSlotAt(int index) {
- FrameElement original = elements_[index];
-
- // Is this element the backing store of any copies?
- int new_backing_index = kIllegalIndex;
- if (original.is_copied()) {
- // Verify it is copied, and find first copy.
- for (int i = index + 1; i < element_count(); i++) {
- if (elements_[i].is_copy() && elements_[i].index() == index) {
- new_backing_index = i;
- break;
- }
- }
- }
-
- if (new_backing_index == kIllegalIndex) {
- // No copies found, return kIllegalIndex.
- if (original.is_register()) {
- Unuse(original.reg());
- }
- elements_[index] = FrameElement::InvalidElement();
- return kIllegalIndex;
- }
-
- // This is the backing store of copies.
- Register backing_reg;
- if (original.is_memory()) {
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- Use(fresh.reg(), new_backing_index);
- backing_reg = fresh.reg();
- __ mov(backing_reg, Operand(ebp, fp_relative(index)));
- } else {
- // The original was in a register.
- backing_reg = original.reg();
- set_register_location(backing_reg, new_backing_index);
- }
- // Invalidate the element at index.
- elements_[index] = FrameElement::InvalidElement();
- // Set the new backing element.
- if (elements_[new_backing_index].is_synced()) {
- elements_[new_backing_index] =
- FrameElement::RegisterElement(backing_reg,
- FrameElement::SYNCED,
- original.type_info());
- } else {
- elements_[new_backing_index] =
- FrameElement::RegisterElement(backing_reg,
- FrameElement::NOT_SYNCED,
- original.type_info());
- }
- // Update the other copies.
- for (int i = new_backing_index + 1; i < element_count(); i++) {
- if (elements_[i].is_copy() && elements_[i].index() == index) {
- elements_[i].set_index(new_backing_index);
- elements_[new_backing_index].set_copied();
- }
- }
- return new_backing_index;
-}
-
-
-void VirtualFrame::TakeFrameSlotAt(int index) {
- ASSERT(index >= 0);
- ASSERT(index <= element_count());
- FrameElement original = elements_[index];
- int new_backing_store_index = InvalidateFrameSlotAt(index);
- if (new_backing_store_index != kIllegalIndex) {
- elements_.Add(CopyElementAt(new_backing_store_index));
- return;
- }
-
- switch (original.type()) {
- case FrameElement::MEMORY: {
- // Emit code to load the original element's data into a register.
- // Push that register as a FrameElement on top of the frame.
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- FrameElement new_element =
- FrameElement::RegisterElement(fresh.reg(),
- FrameElement::NOT_SYNCED,
- original.type_info());
- Use(fresh.reg(), element_count());
- elements_.Add(new_element);
- __ mov(fresh.reg(), Operand(ebp, fp_relative(index)));
- break;
- }
- case FrameElement::REGISTER:
- Use(original.reg(), element_count());
- // Fall through.
- case FrameElement::CONSTANT:
- case FrameElement::COPY:
- original.clear_sync();
- elements_.Add(original);
- break;
- case FrameElement::INVALID:
- UNREACHABLE();
- break;
- }
-}
-
-
-void VirtualFrame::StoreToFrameSlotAt(int index) {
- // Store the value on top of the frame to the virtual frame slot at
- // a given index. The value on top of the frame is left in place.
- // This is a duplicating operation, so it can create copies.
- ASSERT(index >= 0);
- ASSERT(index < element_count());
-
- int top_index = element_count() - 1;
- FrameElement top = elements_[top_index];
- FrameElement original = elements_[index];
- if (top.is_copy() && top.index() == index) return;
- ASSERT(top.is_valid());
-
- InvalidateFrameSlotAt(index);
-
- // InvalidateFrameSlotAt can potentially change any frame element, due
- // to spilling registers to allocate temporaries in order to preserve
- // the copy-on-write semantics of aliased elements. Reload top from
- // the frame.
- top = elements_[top_index];
-
- if (top.is_copy()) {
- // There are two cases based on the relative positions of the
- // stored-to slot and the backing slot of the top element.
- int backing_index = top.index();
- ASSERT(backing_index != index);
- if (backing_index < index) {
- // 1. The top element is a copy of a slot below the stored-to
- // slot. The stored-to slot becomes an unsynced copy of that
- // same backing slot.
- elements_[index] = CopyElementAt(backing_index);
- } else {
- // 2. The top element is a copy of a slot above the stored-to
- // slot. The stored-to slot becomes the new (unsynced) backing
- // slot and both the top element and the element at the former
- // backing slot become copies of it. The sync state of the top
- // and former backing elements is preserved.
- FrameElement backing_element = elements_[backing_index];
- ASSERT(backing_element.is_memory() || backing_element.is_register());
- if (backing_element.is_memory()) {
- // Because sets of copies are canonicalized to be backed by
- // their lowest frame element, and because memory frame
- // elements are backed by the corresponding stack address, we
- // have to move the actual value down in the stack.
- //
- // TODO(209): considering allocating the stored-to slot to the
- // temp register. Alternatively, allow copies to appear in
- // any order in the frame and lazily move the value down to
- // the slot.
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), Operand(ebp, fp_relative(backing_index)));
- __ mov(Operand(ebp, fp_relative(index)), temp.reg());
- } else {
- set_register_location(backing_element.reg(), index);
- if (backing_element.is_synced()) {
- // If the element is a register, we will not actually move
- // anything on the stack but only update the virtual frame
- // element.
- backing_element.clear_sync();
- }
- }
- elements_[index] = backing_element;
-
- // The old backing element becomes a copy of the new backing
- // element.
- FrameElement new_element = CopyElementAt(index);
- elements_[backing_index] = new_element;
- if (backing_element.is_synced()) {
- elements_[backing_index].set_sync();
- }
-
- // All the copies of the old backing element (including the top
- // element) become copies of the new backing element.
- for (int i = backing_index + 1; i < element_count(); i++) {
- if (elements_[i].is_copy() && elements_[i].index() == backing_index) {
- elements_[i].set_index(index);
- }
- }
- }
- return;
- }
-
- // Move the top element to the stored-to slot and replace it (the
- // top element) with a copy.
- elements_[index] = top;
- if (top.is_memory()) {
- // TODO(209): consider allocating the stored-to slot to the temp
- // register. Alternatively, allow copies to appear in any order
- // in the frame and lazily move the value down to the slot.
- FrameElement new_top = CopyElementAt(index);
- new_top.set_sync();
- elements_[top_index] = new_top;
-
- // The sync state of the former top element is correct (synced).
- // Emit code to move the value down in the frame.
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ mov(temp.reg(), Operand(esp, 0));
- __ mov(Operand(ebp, fp_relative(index)), temp.reg());
- } else if (top.is_register()) {
- set_register_location(top.reg(), index);
- // The stored-to slot has the (unsynced) register reference and
- // the top element becomes a copy. The sync state of the top is
- // preserved.
- FrameElement new_top = CopyElementAt(index);
- if (top.is_synced()) {
- new_top.set_sync();
- elements_[index].clear_sync();
- }
- elements_[top_index] = new_top;
- } else {
- // The stored-to slot holds the same value as the top but
- // unsynced. (We do not have copies of constants yet.)
- ASSERT(top.is_constant());
- elements_[index].clear_sync();
- }
-}
-
-
-void VirtualFrame::UntaggedPushFrameSlotAt(int index) {
- ASSERT(index >= 0);
- ASSERT(index <= element_count());
- FrameElement original = elements_[index];
- if (original.is_copy()) {
- original = elements_[original.index()];
- index = original.index();
- }
-
- switch (original.type()) {
- case FrameElement::MEMORY:
- case FrameElement::REGISTER: {
- Label done;
- // Emit code to load the original element's data into a register.
- // Push that register as a FrameElement on top of the frame.
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- Register fresh_reg = fresh.reg();
- FrameElement new_element =
- FrameElement::RegisterElement(fresh_reg,
- FrameElement::NOT_SYNCED,
- original.type_info());
- new_element.set_untagged_int32(true);
- Use(fresh_reg, element_count());
- fresh.Unuse(); // BreakTarget does not handle a live Result well.
- elements_.Add(new_element);
- if (original.is_register()) {
- __ mov(fresh_reg, original.reg());
- } else {
- ASSERT(original.is_memory());
- __ mov(fresh_reg, Operand(ebp, fp_relative(index)));
- }
- // Now convert the value to int32, or bail out.
- if (original.type_info().IsSmi()) {
- __ SmiUntag(fresh_reg);
- // Pushing the element is completely done.
- } else {
- __ test(fresh_reg, Immediate(kSmiTagMask));
- Label not_smi;
- __ j(not_zero, ¬_smi);
- __ SmiUntag(fresh_reg);
- __ jmp(&done);
-
- __ bind(¬_smi);
- if (!original.type_info().IsNumber()) {
- __ cmp(FieldOperand(fresh_reg, HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- cgen()->unsafe_bailout_->Branch(not_equal);
- }
-
- if (!CpuFeatures::IsSupported(SSE2)) {
- UNREACHABLE();
- } else {
- CpuFeatures::Scope use_sse2(SSE2);
- __ movdbl(xmm0, FieldOperand(fresh_reg, HeapNumber::kValueOffset));
- __ cvttsd2si(fresh_reg, Operand(xmm0));
- __ cvtsi2sd(xmm1, Operand(fresh_reg));
- __ ucomisd(xmm0, xmm1);
- cgen()->unsafe_bailout_->Branch(not_equal);
- cgen()->unsafe_bailout_->Branch(parity_even); // NaN.
- // Test for negative zero.
- __ test(fresh_reg, Operand(fresh_reg));
- __ j(not_zero, &done);
- __ movmskpd(fresh_reg, xmm0);
- __ and_(fresh_reg, 0x1);
- cgen()->unsafe_bailout_->Branch(not_equal);
- }
- __ bind(&done);
- }
- break;
- }
- case FrameElement::CONSTANT:
- elements_.Add(CopyElementAt(index));
- elements_[element_count() - 1].set_untagged_int32(true);
- break;
- case FrameElement::COPY:
- case FrameElement::INVALID:
- UNREACHABLE();
- break;
- }
-}
-
-
-void VirtualFrame::PushTryHandler(HandlerType type) {
- ASSERT(cgen()->HasValidEntryRegisters());
- // Grow the expression stack by handler size less one (the return
- // address is already pushed by a call instruction).
- Adjust(kHandlerSize - 1);
- __ PushTryHandler(IN_JAVASCRIPT, type);
-}
-
-
-Result VirtualFrame::RawCallStub(CodeStub* stub) {
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallStub(stub);
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::CallStub(CodeStub* stub, Result* arg) {
- PrepareForCall(0, 0);
- arg->ToRegister(eax);
- arg->Unuse();
- return RawCallStub(stub);
-}
-
-
-Result VirtualFrame::CallStub(CodeStub* stub, Result* arg0, Result* arg1) {
- PrepareForCall(0, 0);
-
- if (arg0->is_register() && arg0->reg().is(eax)) {
- if (arg1->is_register() && arg1->reg().is(edx)) {
- // Wrong registers.
- __ xchg(eax, edx);
- } else {
- // Register edx is free for arg0, which frees eax for arg1.
- arg0->ToRegister(edx);
- arg1->ToRegister(eax);
- }
- } else {
- // Register eax is free for arg1, which guarantees edx is free for
- // arg0.
- arg1->ToRegister(eax);
- arg0->ToRegister(edx);
- }
-
- arg0->Unuse();
- arg1->Unuse();
- return RawCallStub(stub);
-}
-
-
-Result VirtualFrame::CallJSFunction(int arg_count) {
- Result function = Pop();
-
- // InvokeFunction requires function in edi. Move it in there.
- function.ToRegister(edi);
- function.Unuse();
-
- // +1 for receiver.
- PrepareForCall(arg_count + 1, arg_count + 1);
- ASSERT(cgen()->HasValidEntryRegisters());
- ParameterCount count(arg_count);
- __ InvokeFunction(edi, count, CALL_FUNCTION);
- RestoreContextRegister();
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::CallRuntime(const Runtime::Function* f, int arg_count) {
- PrepareForCall(arg_count, arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallRuntime(f, arg_count);
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::CallRuntime(Runtime::FunctionId id, int arg_count) {
- PrepareForCall(arg_count, arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallRuntime(id, arg_count);
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
-void VirtualFrame::DebugBreak() {
- PrepareForCall(0, 0);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ DebugBreak();
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
-}
-#endif
-
-
-Result VirtualFrame::InvokeBuiltin(Builtins::JavaScript id,
- InvokeFlag flag,
- int arg_count) {
- PrepareForCall(arg_count, arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ InvokeBuiltin(id, flag);
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::RawCallCodeObject(Handle<Code> code,
- RelocInfo::Mode rmode) {
- ASSERT(cgen()->HasValidEntryRegisters());
- __ call(code, rmode);
- Result result = cgen()->allocator()->Allocate(eax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-// This function assumes that the only results that could be in a_reg or b_reg
-// are a and b. Other results can be live, but must not be in a_reg or b_reg.
-void VirtualFrame::MoveResultsToRegisters(Result* a,
- Result* b,
- Register a_reg,
- Register b_reg) {
- if (a->is_register() && a->reg().is(a_reg)) {
- b->ToRegister(b_reg);
- } else if (!cgen()->allocator()->is_used(a_reg)) {
- a->ToRegister(a_reg);
- b->ToRegister(b_reg);
- } else if (cgen()->allocator()->is_used(b_reg)) {
- // a must be in b_reg, b in a_reg.
- __ xchg(a_reg, b_reg);
- // Results a and b will be invalidated, so it is ok if they are switched.
- } else {
- b->ToRegister(b_reg);
- a->ToRegister(a_reg);
- }
- a->Unuse();
- b->Unuse();
-}
-
-
-Result VirtualFrame::CallLoadIC(RelocInfo::Mode mode) {
- // Name and receiver are on the top of the frame. The IC expects
- // name in ecx and receiver in eax.
- Result name = Pop();
- Result receiver = Pop();
- PrepareForCall(0, 0); // No stack arguments.
- MoveResultsToRegisters(&name, &receiver, ecx, eax);
-
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kLoadIC_Initialize));
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallKeyedLoadIC(RelocInfo::Mode mode) {
- // Key and receiver are on top of the frame. Put them in eax and edx.
- Result key = Pop();
- Result receiver = Pop();
- PrepareForCall(0, 0);
- MoveResultsToRegisters(&key, &receiver, eax, edx);
-
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kKeyedLoadIC_Initialize));
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallStoreIC(Handle<String> name,
- bool is_contextual,
- StrictModeFlag strict_mode) {
- // Value and (if not contextual) receiver are on top of the frame.
- // The IC expects name in ecx, value in eax, and receiver in edx.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode == kStrictMode) ? Builtins::kStoreIC_Initialize_Strict
- : Builtins::kStoreIC_Initialize));
-
- Result value = Pop();
- RelocInfo::Mode mode;
- if (is_contextual) {
- PrepareForCall(0, 0);
- value.ToRegister(eax);
- __ mov(edx, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
- value.Unuse();
- mode = RelocInfo::CODE_TARGET_CONTEXT;
- } else {
- Result receiver = Pop();
- PrepareForCall(0, 0);
- MoveResultsToRegisters(&value, &receiver, eax, edx);
- mode = RelocInfo::CODE_TARGET;
- }
- __ mov(ecx, name);
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallKeyedStoreIC(StrictModeFlag strict_mode) {
- // Value, key, and receiver are on the top of the frame. The IC
- // expects value in eax, key in ecx, and receiver in edx.
- Result value = Pop();
- Result key = Pop();
- Result receiver = Pop();
- PrepareForCall(0, 0);
- if (!cgen()->allocator()->is_used(eax) ||
- (value.is_register() && value.reg().is(eax))) {
- if (!cgen()->allocator()->is_used(eax)) {
- value.ToRegister(eax);
- }
- MoveResultsToRegisters(&key, &receiver, ecx, edx);
- value.Unuse();
- } else if (!cgen()->allocator()->is_used(ecx) ||
- (key.is_register() && key.reg().is(ecx))) {
- if (!cgen()->allocator()->is_used(ecx)) {
- key.ToRegister(ecx);
- }
- MoveResultsToRegisters(&value, &receiver, eax, edx);
- key.Unuse();
- } else if (!cgen()->allocator()->is_used(edx) ||
- (receiver.is_register() && receiver.reg().is(edx))) {
- if (!cgen()->allocator()->is_used(edx)) {
- receiver.ToRegister(edx);
- }
- MoveResultsToRegisters(&key, &value, ecx, eax);
- receiver.Unuse();
- } else {
- // All three registers are used, and no value is in the correct place.
- // We have one of the two circular permutations of eax, ecx, edx.
- ASSERT(value.is_register());
- if (value.reg().is(ecx)) {
- __ xchg(eax, edx);
- __ xchg(eax, ecx);
- } else {
- __ xchg(eax, ecx);
- __ xchg(eax, edx);
- }
- value.Unuse();
- key.Unuse();
- receiver.Unuse();
- }
-
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict
- : Builtins::kKeyedStoreIC_Initialize));
- return RawCallCodeObject(ic, RelocInfo::CODE_TARGET);
-}
-
-
-Result VirtualFrame::CallCallIC(RelocInfo::Mode mode,
- int arg_count,
- int loop_nesting) {
- // Function name, arguments, and receiver are on top of the frame.
- // The IC expects the name in ecx and the rest on the stack and
- // drops them all.
- InLoopFlag in_loop = loop_nesting > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> ic = Isolate::Current()->stub_cache()->ComputeCallInitialize(
- arg_count, in_loop);
- // Spill args, receiver, and function. The call will drop args and
- // receiver.
- Result name = Pop();
- PrepareForCall(arg_count + 1, arg_count + 1); // Arguments + receiver.
- name.ToRegister(ecx);
- name.Unuse();
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallKeyedCallIC(RelocInfo::Mode mode,
- int arg_count,
- int loop_nesting) {
- // Function name, arguments, and receiver are on top of the frame.
- // The IC expects the name in ecx and the rest on the stack and
- // drops them all.
- InLoopFlag in_loop = loop_nesting > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> ic =
- Isolate::Current()->stub_cache()->ComputeKeyedCallInitialize(arg_count,
- in_loop);
- // Spill args, receiver, and function. The call will drop args and
- // receiver.
- Result name = Pop();
- PrepareForCall(arg_count + 1, arg_count + 1); // Arguments + receiver.
- name.ToRegister(ecx);
- name.Unuse();
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallConstructor(int arg_count) {
- // Arguments, receiver, and function are on top of the frame. The
- // IC expects arg count in eax, function in edi, and the arguments
- // and receiver on the stack.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kJSConstructCall));
- // Duplicate the function before preparing the frame.
- PushElementAt(arg_count);
- Result function = Pop();
- PrepareForCall(arg_count + 1, arg_count + 1); // Spill function and args.
- function.ToRegister(edi);
-
- // Constructors are called with the number of arguments in register
- // eax for now. Another option would be to have separate construct
- // call trampolines per different arguments counts encountered.
- Result num_args = cgen()->allocator()->Allocate(eax);
- ASSERT(num_args.is_valid());
- __ Set(num_args.reg(), Immediate(arg_count));
-
- function.Unuse();
- num_args.Unuse();
- return RawCallCodeObject(ic, RelocInfo::CONSTRUCT_CALL);
-}
-
-
-void VirtualFrame::Drop(int count) {
- ASSERT(count >= 0);
- ASSERT(height() >= count);
- int num_virtual_elements = (element_count() - 1) - stack_pointer_;
-
- // Emit code to lower the stack pointer if necessary.
- if (num_virtual_elements < count) {
- int num_dropped = count - num_virtual_elements;
- stack_pointer_ -= num_dropped;
- __ add(Operand(esp), Immediate(num_dropped * kPointerSize));
- }
-
- // Discard elements from the virtual frame and free any registers.
- for (int i = 0; i < count; i++) {
- FrameElement dropped = elements_.RemoveLast();
- if (dropped.is_register()) {
- Unuse(dropped.reg());
- }
- }
-}
-
-
-Result VirtualFrame::Pop() {
- FrameElement element = elements_.RemoveLast();
- int index = element_count();
- ASSERT(element.is_valid());
- ASSERT(element.is_untagged_int32() == cgen()->in_safe_int32_mode());
-
- // Get number type information of the result.
- TypeInfo info;
- if (!element.is_copy()) {
- info = element.type_info();
- } else {
- info = elements_[element.index()].type_info();
- }
-
- bool pop_needed = (stack_pointer_ == index);
- if (pop_needed) {
- stack_pointer_--;
- if (element.is_memory()) {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ pop(temp.reg());
- temp.set_type_info(info);
- temp.set_untagged_int32(element.is_untagged_int32());
- return temp;
- }
-
- __ add(Operand(esp), Immediate(kPointerSize));
- }
- ASSERT(!element.is_memory());
-
- // The top element is a register, constant, or a copy. Unuse
- // registers and follow copies to their backing store.
- if (element.is_register()) {
- Unuse(element.reg());
- } else if (element.is_copy()) {
- ASSERT(!element.is_untagged_int32());
- ASSERT(element.index() < index);
- index = element.index();
- element = elements_[index];
- }
- ASSERT(!element.is_copy());
-
- // The element is memory, a register, or a constant.
- if (element.is_memory()) {
- // Memory elements could only be the backing store of a copy.
- // Allocate the original to a register.
- ASSERT(index <= stack_pointer_);
- ASSERT(!element.is_untagged_int32());
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- Use(temp.reg(), index);
- FrameElement new_element =
- FrameElement::RegisterElement(temp.reg(),
- FrameElement::SYNCED,
- element.type_info());
- // Preserve the copy flag on the element.
- if (element.is_copied()) new_element.set_copied();
- elements_[index] = new_element;
- __ mov(temp.reg(), Operand(ebp, fp_relative(index)));
- return Result(temp.reg(), info);
- } else if (element.is_register()) {
- Result return_value(element.reg(), info);
- return_value.set_untagged_int32(element.is_untagged_int32());
- return return_value;
- } else {
- ASSERT(element.is_constant());
- Result return_value(element.handle());
- return_value.set_untagged_int32(element.is_untagged_int32());
- return return_value;
- }
-}
-
-
-void VirtualFrame::EmitPop(Register reg) {
- ASSERT(stack_pointer_ == element_count() - 1);
- stack_pointer_--;
- elements_.RemoveLast();
- __ pop(reg);
-}
-
-
-void VirtualFrame::EmitPop(Operand operand) {
- ASSERT(stack_pointer_ == element_count() - 1);
- stack_pointer_--;
- elements_.RemoveLast();
- __ pop(operand);
-}
-
-
-void VirtualFrame::EmitPush(Register reg, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ push(reg);
-}
-
-
-void VirtualFrame::EmitPush(Operand operand, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ push(operand);
-}
-
-
-void VirtualFrame::EmitPush(Immediate immediate, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ push(immediate);
-}
-
-
-void VirtualFrame::PushUntaggedElement(Handle<Object> value) {
- ASSERT(!ConstantPoolOverflowed());
- elements_.Add(FrameElement::ConstantElement(value, FrameElement::NOT_SYNCED));
- elements_[element_count() - 1].set_untagged_int32(true);
-}
-
-
-void VirtualFrame::Push(Expression* expr) {
- ASSERT(expr->IsTrivial());
-
- Literal* lit = expr->AsLiteral();
- if (lit != NULL) {
- Push(lit->handle());
- return;
- }
-
- VariableProxy* proxy = expr->AsVariableProxy();
- if (proxy != NULL) {
- Slot* slot = proxy->var()->AsSlot();
- if (slot->type() == Slot::LOCAL) {
- PushLocalAt(slot->index());
- return;
- }
- if (slot->type() == Slot::PARAMETER) {
- PushParameterAt(slot->index());
- return;
- }
- }
- UNREACHABLE();
-}
-
-
-void VirtualFrame::Push(Handle<Object> value) {
- if (ConstantPoolOverflowed()) {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ Set(temp.reg(), Immediate(value));
- Push(&temp);
- } else {
- FrameElement element =
- FrameElement::ConstantElement(value, FrameElement::NOT_SYNCED);
- elements_.Add(element);
- }
-}
-
-
-#undef __
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_IA32
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_IA32_VIRTUAL_FRAME_IA32_H_
-#define V8_IA32_VIRTUAL_FRAME_IA32_H_
-
-#include "codegen.h"
-#include "register-allocator.h"
-#include "scopes.h"
-#include "type-info.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Virtual frames
-//
-// The virtual frame is an abstraction of the physical stack frame. It
-// encapsulates the parameters, frame-allocated locals, and the expression
-// stack. It supports push/pop operations on the expression stack, as well
-// as random access to the expression stack elements, locals, and
-// parameters.
-
-class VirtualFrame: public ZoneObject {
- public:
- // A utility class to introduce a scope where the virtual frame is
- // expected to remain spilled. The constructor spills the code
- // generator's current frame, but no attempt is made to require it
- // to stay spilled. It is intended as documentation while the code
- // generator is being transformed.
- class SpilledScope BASE_EMBEDDED {
- public:
- SpilledScope() : previous_state_(cgen()->in_spilled_code()) {
- ASSERT(cgen()->has_valid_frame());
- cgen()->frame()->SpillAll();
- cgen()->set_in_spilled_code(true);
- }
-
- ~SpilledScope() {
- cgen()->set_in_spilled_code(previous_state_);
- }
-
- private:
- bool previous_state_;
-
- CodeGenerator* cgen() {
- return CodeGeneratorScope::Current(Isolate::Current());
- }
- };
-
- // An illegal index into the virtual frame.
- static const int kIllegalIndex = -1;
-
- // Construct an initial virtual frame on entry to a JS function.
- inline VirtualFrame();
-
- // Construct a virtual frame as a clone of an existing one.
- explicit inline VirtualFrame(VirtualFrame* original);
-
- CodeGenerator* cgen() {
- return CodeGeneratorScope::Current(Isolate::Current());
- }
-
- MacroAssembler* masm() { return cgen()->masm(); }
-
- // Create a duplicate of an existing valid frame element.
- FrameElement CopyElementAt(int index,
- TypeInfo info = TypeInfo::Uninitialized());
-
- // The number of elements on the virtual frame.
- int element_count() { return elements_.length(); }
-
- // The height of the virtual expression stack.
- int height() { return element_count() - expression_base_index(); }
-
- int register_location(int num) {
- ASSERT(num >= 0 && num < RegisterAllocator::kNumRegisters);
- return register_locations_[num];
- }
-
- inline int register_location(Register reg);
-
- inline void set_register_location(Register reg, int index);
-
- bool is_used(int num) {
- ASSERT(num >= 0 && num < RegisterAllocator::kNumRegisters);
- return register_locations_[num] != kIllegalIndex;
- }
-
- inline bool is_used(Register reg);
-
- // Add extra in-memory elements to the top of the frame to match an actual
- // frame (eg, the frame after an exception handler is pushed). No code is
- // emitted.
- void Adjust(int count);
-
- // Forget count elements from the top of the frame all in-memory
- // (including synced) and adjust the stack pointer downward, to
- // match an external frame effect (examples include a call removing
- // its arguments, and exiting a try/catch removing an exception
- // handler). No code will be emitted.
- void Forget(int count) {
- ASSERT(count >= 0);
- ASSERT(stack_pointer_ == element_count() - 1);
- stack_pointer_ -= count;
- ForgetElements(count);
- }
-
- // Forget count elements from the top of the frame without adjusting
- // the stack pointer downward. This is used, for example, before
- // merging frames at break, continue, and return targets.
- void ForgetElements(int count);
-
- // Spill all values from the frame to memory.
- inline void SpillAll();
-
- // Spill all occurrences of a specific register from the frame.
- void Spill(Register reg) {
- if (is_used(reg)) SpillElementAt(register_location(reg));
- }
-
- // Make the two registers distinct and spill them. Returns the second
- // register. If the registers were not distinct then it returns the new
- // second register.
- Result MakeDistinctAndSpilled(Result* left, Result* right) {
- Spill(left->reg());
- Spill(right->reg());
- if (left->reg().is(right->reg())) {
- RegisterAllocator* allocator = cgen()->allocator();
- Result fresh = allocator->Allocate();
- ASSERT(fresh.is_valid());
- masm()->mov(fresh.reg(), right->reg());
- return fresh;
- }
- return *right;
- }
-
- // Spill all occurrences of an arbitrary register if possible. Return the
- // register spilled or no_reg if it was not possible to free any register
- // (ie, they all have frame-external references).
- Register SpillAnyRegister();
-
- // Spill the top element of the frame.
- void SpillTop() { SpillElementAt(element_count() - 1); }
-
- // Sync the range of elements in [begin, end] with memory.
- void SyncRange(int begin, int end);
-
- // Make this frame so that an arbitrary frame of the same height can
- // be merged to it. Copies and constants are removed from the frame.
- void MakeMergable();
-
- // Prepare this virtual frame for merging to an expected frame by
- // performing some state changes that do not require generating
- // code. It is guaranteed that no code will be generated.
- void PrepareMergeTo(VirtualFrame* expected);
-
- // Make this virtual frame have a state identical to an expected virtual
- // frame. As a side effect, code may be emitted to make this frame match
- // the expected one.
- void MergeTo(VirtualFrame* expected);
-
- // Detach a frame from its code generator, perhaps temporarily. This
- // tells the register allocator that it is free to use frame-internal
- // registers. Used when the code generator's frame is switched from this
- // one to NULL by an unconditional jump.
- void DetachFromCodeGenerator() {
- RegisterAllocator* cgen_allocator = cgen()->allocator();
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (is_used(i)) cgen_allocator->Unuse(i);
- }
- }
-
- // (Re)attach a frame to its code generator. This informs the register
- // allocator that the frame-internal register references are active again.
- // Used when a code generator's frame is switched from NULL to this one by
- // binding a label.
- void AttachToCodeGenerator() {
- RegisterAllocator* cgen_allocator = cgen()->allocator();
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (is_used(i)) cgen_allocator->Use(i);
- }
- }
-
- // Emit code for the physical JS entry and exit frame sequences. After
- // calling Enter, the virtual frame is ready for use; and after calling
- // Exit it should not be used. Note that Enter does not allocate space in
- // the physical frame for storing frame-allocated locals.
- void Enter();
- void Exit();
-
- // Prepare for returning from the frame by spilling locals. This
- // avoids generating unnecessary merge code when jumping to the
- // shared return site. Emits code for spills.
- inline void PrepareForReturn();
-
- // Number of local variables after when we use a loop for allocating.
- static const int kLocalVarBound = 10;
-
- // Allocate and initialize the frame-allocated locals.
- void AllocateStackSlots();
-
- // An element of the expression stack as an assembly operand.
- Operand ElementAt(int index) const {
- return Operand(esp, index * kPointerSize);
- }
-
- // Random-access store to a frame-top relative frame element. The result
- // becomes owned by the frame and is invalidated.
- void SetElementAt(int index, Result* value);
-
- // Set a frame element to a constant. The index is frame-top relative.
- inline void SetElementAt(int index, Handle<Object> value);
-
- void PushElementAt(int index) {
- PushFrameSlotAt(element_count() - index - 1);
- }
-
- void StoreToElementAt(int index) {
- StoreToFrameSlotAt(element_count() - index - 1);
- }
-
- // A frame-allocated local as an assembly operand.
- Operand LocalAt(int index) {
- ASSERT(0 <= index);
- ASSERT(index < local_count());
- return Operand(ebp, kLocal0Offset - index * kPointerSize);
- }
-
- // Push a copy of the value of a local frame slot on top of the frame.
- void PushLocalAt(int index) {
- PushFrameSlotAt(local0_index() + index);
- }
-
- // Push a copy of the value of a local frame slot on top of the frame.
- void UntaggedPushLocalAt(int index) {
- UntaggedPushFrameSlotAt(local0_index() + index);
- }
-
- // Push the value of a local frame slot on top of the frame and invalidate
- // the local slot. The slot should be written to before trying to read
- // from it again.
- void TakeLocalAt(int index) {
- TakeFrameSlotAt(local0_index() + index);
- }
-
- // Store the top value on the virtual frame into a local frame slot. The
- // value is left in place on top of the frame.
- void StoreToLocalAt(int index) {
- StoreToFrameSlotAt(local0_index() + index);
- }
-
- // Push the address of the receiver slot on the frame.
- void PushReceiverSlotAddress();
-
- // Push the function on top of the frame.
- void PushFunction() {
- PushFrameSlotAt(function_index());
- }
-
- // Save the value of the esi register to the context frame slot.
- void SaveContextRegister();
-
- // Restore the esi register from the value of the context frame
- // slot.
- void RestoreContextRegister();
-
- // A parameter as an assembly operand.
- Operand ParameterAt(int index) {
- ASSERT(-1 <= index); // -1 is the receiver.
- ASSERT(index < parameter_count());
- return Operand(ebp, (1 + parameter_count() - index) * kPointerSize);
- }
-
- // Push a copy of the value of a parameter frame slot on top of the frame.
- void PushParameterAt(int index) {
- PushFrameSlotAt(param0_index() + index);
- }
-
- // Push a copy of the value of a parameter frame slot on top of the frame.
- void UntaggedPushParameterAt(int index) {
- UntaggedPushFrameSlotAt(param0_index() + index);
- }
-
- // Push the value of a paramter frame slot on top of the frame and
- // invalidate the parameter slot. The slot should be written to before
- // trying to read from it again.
- void TakeParameterAt(int index) {
- TakeFrameSlotAt(param0_index() + index);
- }
-
- // Store the top value on the virtual frame into a parameter frame slot.
- // The value is left in place on top of the frame.
- void StoreToParameterAt(int index) {
- StoreToFrameSlotAt(param0_index() + index);
- }
-
- // The receiver frame slot.
- Operand Receiver() {
- return ParameterAt(-1);
- }
-
- // Push a try-catch or try-finally handler on top of the virtual frame.
- void PushTryHandler(HandlerType type);
-
- // Call stub given the number of arguments it expects on (and
- // removes from) the stack.
- inline Result CallStub(CodeStub* stub, int arg_count);
-
- // Call stub that takes a single argument passed in eax. The
- // argument is given as a result which does not have to be eax or
- // even a register. The argument is consumed by the call.
- Result CallStub(CodeStub* stub, Result* arg);
-
- // Call stub that takes a pair of arguments passed in edx (arg0) and
- // eax (arg1). The arguments are given as results which do not have
- // to be in the proper registers or even in registers. The
- // arguments are consumed by the call.
- Result CallStub(CodeStub* stub, Result* arg0, Result* arg1);
-
- // Call JS function from top of the stack with arguments
- // taken from the stack.
- Result CallJSFunction(int arg_count);
-
- // Call runtime given the number of arguments expected on (and
- // removed from) the stack.
- Result CallRuntime(const Runtime::Function* f, int arg_count);
- Result CallRuntime(Runtime::FunctionId id, int arg_count);
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
- void DebugBreak();
-#endif
-
- // Invoke builtin given the number of arguments it expects on (and
- // removes from) the stack.
- Result InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag, int arg_count);
-
- // Call load IC. Name and receiver are found on top of the frame.
- // Both are dropped.
- Result CallLoadIC(RelocInfo::Mode mode);
-
- // Call keyed load IC. Key and receiver are found on top of the
- // frame. Both are dropped.
- Result CallKeyedLoadIC(RelocInfo::Mode mode);
-
- // Call store IC. If the load is contextual, value is found on top of the
- // frame. If not, value and receiver are on the frame. Both are dropped.
- Result CallStoreIC(Handle<String> name, bool is_contextual,
- StrictModeFlag strict_mode);
-
- // Call keyed store IC. Value, key, and receiver are found on top
- // of the frame. All three are dropped.
- Result CallKeyedStoreIC(StrictModeFlag strict_mode);
-
- // Call call IC. Function name, arguments, and receiver are found on top
- // of the frame and dropped by the call. The argument count does not
- // include the receiver.
- Result CallCallIC(RelocInfo::Mode mode, int arg_count, int loop_nesting);
-
- // Call keyed call IC. Same calling convention as CallCallIC.
- Result CallKeyedCallIC(RelocInfo::Mode mode, int arg_count, int loop_nesting);
-
- // Allocate and call JS function as constructor. Arguments,
- // receiver (global object), and function are found on top of the
- // frame. Function is not dropped. The argument count does not
- // include the receiver.
- Result CallConstructor(int arg_count);
-
- // Drop a number of elements from the top of the expression stack. May
- // emit code to affect the physical frame. Does not clobber any registers
- // excepting possibly the stack pointer.
- void Drop(int count);
-
- // Drop one element.
- void Drop() {
- Drop(1);
- }
-
- // Duplicate the top element of the frame.
- void Dup() {
- PushFrameSlotAt(element_count() - 1);
- }
-
- // Pop an element from the top of the expression stack. Returns a
- // Result, which may be a constant or a register.
- Result Pop();
-
- // Pop and save an element from the top of the expression stack and
- // emit a corresponding pop instruction.
- void EmitPop(Register reg);
- void EmitPop(Operand operand);
-
- // Push an element on top of the expression stack and emit a
- // corresponding push instruction.
- void EmitPush(Register reg,
- TypeInfo info = TypeInfo::Unknown());
- void EmitPush(Operand operand,
- TypeInfo info = TypeInfo::Unknown());
- void EmitPush(Immediate immediate,
- TypeInfo info = TypeInfo::Unknown());
-
- inline bool ConstantPoolOverflowed();
-
- // Push an element on the virtual frame.
- void Push(Handle<Object> value);
- inline void Push(Register reg, TypeInfo info = TypeInfo::Unknown());
- inline void Push(Smi* value);
-
- void PushUntaggedElement(Handle<Object> value);
-
- // Pushing a result invalidates it (its contents become owned by the
- // frame).
- void Push(Result* result) {
- // This assert will trigger if you try to push the same value twice.
- ASSERT(result->is_valid());
- if (result->is_register()) {
- Push(result->reg(), result->type_info());
- } else {
- ASSERT(result->is_constant());
- Push(result->handle());
- }
- if (cgen()->in_safe_int32_mode()) {
- ASSERT(result->is_untagged_int32());
- elements_[element_count() - 1].set_untagged_int32(true);
- }
- result->Unuse();
- }
-
- // Pushing an expression expects that the expression is trivial (according
- // to Expression::IsTrivial).
- void Push(Expression* expr);
-
- // Nip removes zero or more elements from immediately below the top
- // of the frame, leaving the previous top-of-frame value on top of
- // the frame. Nip(k) is equivalent to x = Pop(), Drop(k), Push(x).
- inline void Nip(int num_dropped);
-
- // Check that the frame has no elements containing untagged int32 elements.
- bool HasNoUntaggedInt32Elements() {
- for (int i = 0; i < element_count(); ++i) {
- if (elements_[i].is_untagged_int32()) return false;
- }
- return true;
- }
-
- // Update the type information of a variable frame element directly.
- inline void SetTypeForLocalAt(int index, TypeInfo info);
- inline void SetTypeForParamAt(int index, TypeInfo info);
-
- private:
- static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset;
- static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset;
- static const int kContextOffset = StandardFrameConstants::kContextOffset;
-
- static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize;
- static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots.
-
- ZoneList<FrameElement> elements_;
-
- // The index of the element that is at the processor's stack pointer
- // (the esp register).
- int stack_pointer_;
-
- // The index of the register frame element using each register, or
- // kIllegalIndex if a register is not on the frame.
- int register_locations_[RegisterAllocator::kNumRegisters];
-
- // The number of frame-allocated locals and parameters respectively.
- inline int parameter_count();
-
- inline int local_count();
-
- // The index of the element that is at the processor's frame pointer
- // (the ebp register). The parameters, receiver, and return address
- // are below the frame pointer.
- int frame_pointer() {
- return parameter_count() + 2;
- }
-
- // The index of the first parameter. The receiver lies below the first
- // parameter.
- int param0_index() {
- return 1;
- }
-
- // The index of the context slot in the frame. It is immediately
- // above the frame pointer.
- int context_index() {
- return frame_pointer() + 1;
- }
-
- // The index of the function slot in the frame. It is above the frame
- // pointer and the context slot.
- int function_index() {
- return frame_pointer() + 2;
- }
-
- // The index of the first local. Between the frame pointer and the
- // locals lie the context and the function.
- int local0_index() {
- return frame_pointer() + 3;
- }
-
- // The index of the base of the expression stack.
- int expression_base_index() {
- return local0_index() + local_count();
- }
-
- // Convert a frame index into a frame pointer relative offset into the
- // actual stack.
- int fp_relative(int index) {
- ASSERT(index < element_count());
- ASSERT(frame_pointer() < element_count()); // FP is on the frame.
- return (frame_pointer() - index) * kPointerSize;
- }
-
- // Record an occurrence of a register in the virtual frame. This has the
- // effect of incrementing the register's external reference count and
- // of updating the index of the register's location in the frame.
- void Use(Register reg, int index) {
- ASSERT(!is_used(reg));
- set_register_location(reg, index);
- cgen()->allocator()->Use(reg);
- }
-
- // Record that a register reference has been dropped from the frame. This
- // decrements the register's external reference count and invalidates the
- // index of the register's location in the frame.
- void Unuse(Register reg) {
- ASSERT(is_used(reg));
- set_register_location(reg, kIllegalIndex);
- cgen()->allocator()->Unuse(reg);
- }
-
- // Spill the element at a particular index---write it to memory if
- // necessary, free any associated register, and forget its value if
- // constant.
- void SpillElementAt(int index);
-
- // Sync the element at a particular index. If it is a register or
- // constant that disagrees with the value on the stack, write it to memory.
- // Keep the element type as register or constant, and clear the dirty bit.
- void SyncElementAt(int index);
-
- // Sync a single unsynced element that lies beneath or at the stack pointer.
- void SyncElementBelowStackPointer(int index);
-
- // Sync a single unsynced element that lies just above the stack pointer.
- void SyncElementByPushing(int index);
-
- // Push a copy of a frame slot (typically a local or parameter) on top of
- // the frame.
- inline void PushFrameSlotAt(int index);
-
- // Push a copy of a frame slot (typically a local or parameter) on top of
- // the frame, at an untagged int32 value. Bails out if the value is not
- // an int32.
- void UntaggedPushFrameSlotAt(int index);
-
- // Push a the value of a frame slot (typically a local or parameter) on
- // top of the frame and invalidate the slot.
- void TakeFrameSlotAt(int index);
-
- // Store the value on top of the frame to a frame slot (typically a local
- // or parameter).
- void StoreToFrameSlotAt(int index);
-
- // Spill all elements in registers. Spill the top spilled_args elements
- // on the frame. Sync all other frame elements.
- // Then drop dropped_args elements from the virtual frame, to match
- // the effect of an upcoming call that will drop them from the stack.
- void PrepareForCall(int spilled_args, int dropped_args);
-
- // Move frame elements currently in registers or constants, that
- // should be in memory in the expected frame, to memory.
- void MergeMoveRegistersToMemory(VirtualFrame* expected);
-
- // Make the register-to-register moves necessary to
- // merge this frame with the expected frame.
- // Register to memory moves must already have been made,
- // and memory to register moves must follow this call.
- // This is because some new memory-to-register moves are
- // created in order to break cycles of register moves.
- // Used in the implementation of MergeTo().
- void MergeMoveRegistersToRegisters(VirtualFrame* expected);
-
- // Make the memory-to-register and constant-to-register moves
- // needed to make this frame equal the expected frame.
- // Called after all register-to-memory and register-to-register
- // moves have been made. After this function returns, the frames
- // should be equal.
- void MergeMoveMemoryToRegisters(VirtualFrame* expected);
-
- // Invalidates a frame slot (puts an invalid frame element in it).
- // Copies on the frame are correctly handled, and if this slot was
- // the backing store of copies, the index of the new backing store
- // is returned. Otherwise, returns kIllegalIndex.
- // Register counts are correctly updated.
- int InvalidateFrameSlotAt(int index);
-
- // This function assumes that a and b are the only results that could be in
- // the registers a_reg or b_reg. Other results can be live, but must not
- // be in the registers a_reg or b_reg. The results a and b are invalidated.
- void MoveResultsToRegisters(Result* a,
- Result* b,
- Register a_reg,
- Register b_reg);
-
- // Call a code stub that has already been prepared for calling (via
- // PrepareForCall).
- Result RawCallStub(CodeStub* stub);
-
- // Calls a code object which has already been prepared for calling
- // (via PrepareForCall).
- Result RawCallCodeObject(Handle<Code> code, RelocInfo::Mode rmode);
-
- inline bool Equals(VirtualFrame* other);
-
- // Classes that need raw access to the elements_ array.
- friend class FrameRegisterState;
- friend class JumpTarget;
-};
-
-} } // namespace v8::internal
-
-#endif // V8_IA32_VIRTUAL_FRAME_IA32_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_HEAVY_INL_H_
-#define V8_JUMP_TARGET_HEAVY_INL_H_
-
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-void JumpTarget::InitializeEntryElement(int index, FrameElement* target) {
- FrameElement* element = &entry_frame_->elements_[index];
- element->clear_copied();
- if (target->is_register()) {
- entry_frame_->set_register_location(target->reg(), index);
- } else if (target->is_copy()) {
- entry_frame_->elements_[target->index()].set_copied();
- }
- if (direction_ == BIDIRECTIONAL && !target->is_copy()) {
- element->set_type_info(TypeInfo::Unknown());
- }
-}
-
-} } // namespace v8::internal
-
-#endif // V8_JUMP_TARGET_HEAVY_INL_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-#include "register-allocator-inl.h"
-
-namespace v8 {
-namespace internal {
-
-
-void JumpTarget::Jump(Result* arg) {
- ASSERT(cgen()->has_valid_frame());
-
- cgen()->frame()->Push(arg);
- DoJump();
-}
-
-
-void JumpTarget::Branch(Condition cc, Result* arg, Hint hint) {
- ASSERT(cgen()->has_valid_frame());
-
- // We want to check that non-frame registers at the call site stay in
- // the same registers on the fall-through branch.
-#ifdef DEBUG
- Result::Type arg_type = arg->type();
- Register arg_reg = arg->is_register() ? arg->reg() : no_reg;
-#endif
-
- cgen()->frame()->Push(arg);
- DoBranch(cc, hint);
- *arg = cgen()->frame()->Pop();
-
- ASSERT(arg->type() == arg_type);
- ASSERT(!arg->is_register() || arg->reg().is(arg_reg));
-}
-
-
-void JumpTarget::Branch(Condition cc, Result* arg0, Result* arg1, Hint hint) {
- ASSERT(cgen()->has_valid_frame());
-
- // We want to check that non-frame registers at the call site stay in
- // the same registers on the fall-through branch.
-#ifdef DEBUG
- Result::Type arg0_type = arg0->type();
- Register arg0_reg = arg0->is_register() ? arg0->reg() : no_reg;
- Result::Type arg1_type = arg1->type();
- Register arg1_reg = arg1->is_register() ? arg1->reg() : no_reg;
-#endif
-
- cgen()->frame()->Push(arg0);
- cgen()->frame()->Push(arg1);
- DoBranch(cc, hint);
- *arg1 = cgen()->frame()->Pop();
- *arg0 = cgen()->frame()->Pop();
-
- ASSERT(arg0->type() == arg0_type);
- ASSERT(!arg0->is_register() || arg0->reg().is(arg0_reg));
- ASSERT(arg1->type() == arg1_type);
- ASSERT(!arg1->is_register() || arg1->reg().is(arg1_reg));
-}
-
-
-void BreakTarget::Branch(Condition cc, Result* arg, Hint hint) {
- ASSERT(cgen()->has_valid_frame());
-
- int count = cgen()->frame()->height() - expected_height_;
- if (count > 0) {
- // We negate and branch here rather than using DoBranch's negate
- // and branch. This gives us a hook to remove statement state
- // from the frame.
- JumpTarget fall_through;
- // Branch to fall through will not negate, because it is a
- // forward-only target.
- fall_through.Branch(NegateCondition(cc), NegateHint(hint));
- Jump(arg); // May emit merge code here.
- fall_through.Bind();
- } else {
-#ifdef DEBUG
- Result::Type arg_type = arg->type();
- Register arg_reg = arg->is_register() ? arg->reg() : no_reg;
-#endif
- cgen()->frame()->Push(arg);
- DoBranch(cc, hint);
- *arg = cgen()->frame()->Pop();
- ASSERT(arg->type() == arg_type);
- ASSERT(!arg->is_register() || arg->reg().is(arg_reg));
- }
-}
-
-
-void JumpTarget::Bind(Result* arg) {
- if (cgen()->has_valid_frame()) {
- cgen()->frame()->Push(arg);
- }
- DoBind();
- *arg = cgen()->frame()->Pop();
-}
-
-
-void JumpTarget::Bind(Result* arg0, Result* arg1) {
- if (cgen()->has_valid_frame()) {
- cgen()->frame()->Push(arg0);
- cgen()->frame()->Push(arg1);
- }
- DoBind();
- *arg1 = cgen()->frame()->Pop();
- *arg0 = cgen()->frame()->Pop();
-}
-
-
-void JumpTarget::ComputeEntryFrame() {
- // Given: a collection of frames reaching by forward CFG edges and
- // the directionality of the block. Compute: an entry frame for the
- // block.
-
- Isolate::Current()->counters()->compute_entry_frame()->Increment();
-#ifdef DEBUG
- if (Isolate::Current()->jump_target_compiling_deferred_code()) {
- ASSERT(reaching_frames_.length() > 1);
- VirtualFrame* frame = reaching_frames_[0];
- bool all_identical = true;
- for (int i = 1; i < reaching_frames_.length(); i++) {
- if (!frame->Equals(reaching_frames_[i])) {
- all_identical = false;
- break;
- }
- }
- ASSERT(!all_identical || all_identical);
- }
-#endif
-
- // Choose an initial frame.
- VirtualFrame* initial_frame = reaching_frames_[0];
-
- // A list of pointers to frame elements in the entry frame. NULL
- // indicates that the element has not yet been determined.
- int length = initial_frame->element_count();
- ZoneList<FrameElement*> elements(length);
-
- // Initially populate the list of elements based on the initial
- // frame.
- for (int i = 0; i < length; i++) {
- FrameElement element = initial_frame->elements_[i];
- // We do not allow copies or constants in bidirectional frames.
- if (direction_ == BIDIRECTIONAL) {
- if (element.is_constant() || element.is_copy()) {
- elements.Add(NULL);
- continue;
- }
- }
- elements.Add(&initial_frame->elements_[i]);
- }
-
- // Compute elements based on the other reaching frames.
- if (reaching_frames_.length() > 1) {
- for (int i = 0; i < length; i++) {
- FrameElement* element = elements[i];
- for (int j = 1; j < reaching_frames_.length(); j++) {
- // Element computation is monotonic: new information will not
- // change our decision about undetermined or invalid elements.
- if (element == NULL || !element->is_valid()) break;
-
- FrameElement* other = &reaching_frames_[j]->elements_[i];
- element = element->Combine(other);
- if (element != NULL && !element->is_copy()) {
- ASSERT(other != NULL);
- // We overwrite the number information of one of the incoming frames.
- // This is safe because we only use the frame for emitting merge code.
- // The number information of incoming frames is not used anymore.
- element->set_type_info(TypeInfo::Combine(element->type_info(),
- other->type_info()));
- }
- }
- elements[i] = element;
- }
- }
-
- // Build the new frame. A freshly allocated frame has memory elements
- // for the parameters and some platform-dependent elements (e.g.,
- // return address). Replace those first.
- entry_frame_ = new VirtualFrame();
- int index = 0;
- for (; index < entry_frame_->element_count(); index++) {
- FrameElement* target = elements[index];
- // If the element is determined, set it now. Count registers. Mark
- // elements as copied exactly when they have a copy. Undetermined
- // elements are initially recorded as if in memory.
- if (target != NULL) {
- entry_frame_->elements_[index] = *target;
- InitializeEntryElement(index, target);
- }
- }
- // Then fill in the rest of the frame with new elements.
- for (; index < length; index++) {
- FrameElement* target = elements[index];
- if (target == NULL) {
- entry_frame_->elements_.Add(
- FrameElement::MemoryElement(TypeInfo::Uninitialized()));
- } else {
- entry_frame_->elements_.Add(*target);
- InitializeEntryElement(index, target);
- }
- }
-
- // Allocate any still-undetermined frame elements to registers or
- // memory, from the top down.
- for (int i = length - 1; i >= 0; i--) {
- if (elements[i] == NULL) {
- // Loop over all the reaching frames to check whether the element
- // is synced on all frames and to count the registers it occupies.
- bool is_synced = true;
- RegisterFile candidate_registers;
- int best_count = kMinInt;
- int best_reg_num = RegisterAllocator::kInvalidRegister;
- TypeInfo info = TypeInfo::Uninitialized();
-
- for (int j = 0; j < reaching_frames_.length(); j++) {
- FrameElement element = reaching_frames_[j]->elements_[i];
- if (direction_ == BIDIRECTIONAL) {
- info = TypeInfo::Unknown();
- } else if (!element.is_copy()) {
- info = TypeInfo::Combine(info, element.type_info());
- } else {
- // New elements will not be copies, so get number information from
- // backing element in the reaching frame.
- info = TypeInfo::Combine(info,
- reaching_frames_[j]->elements_[element.index()].type_info());
- }
- is_synced = is_synced && element.is_synced();
- if (element.is_register() && !entry_frame_->is_used(element.reg())) {
- // Count the register occurrence and remember it if better
- // than the previous best.
- int num = RegisterAllocator::ToNumber(element.reg());
- candidate_registers.Use(num);
- if (candidate_registers.count(num) > best_count) {
- best_count = candidate_registers.count(num);
- best_reg_num = num;
- }
- }
- }
-
- // We must have a number type information now (not for copied elements).
- ASSERT(entry_frame_->elements_[i].is_copy()
- || !info.IsUninitialized());
-
- // If the value is synced on all frames, put it in memory. This
- // costs nothing at the merge code but will incur a
- // memory-to-register move when the value is needed later.
- if (is_synced) {
- // Already recorded as a memory element.
- // Set combined number info.
- entry_frame_->elements_[i].set_type_info(info);
- continue;
- }
-
- // Try to put it in a register. If there was no best choice
- // consider any free register.
- if (best_reg_num == RegisterAllocator::kInvalidRegister) {
- for (int j = 0; j < RegisterAllocator::kNumRegisters; j++) {
- if (!entry_frame_->is_used(j)) {
- best_reg_num = j;
- break;
- }
- }
- }
-
- if (best_reg_num != RegisterAllocator::kInvalidRegister) {
- // If there was a register choice, use it. Preserve the copied
- // flag on the element.
- bool is_copied = entry_frame_->elements_[i].is_copied();
- Register reg = RegisterAllocator::ToRegister(best_reg_num);
- entry_frame_->elements_[i] =
- FrameElement::RegisterElement(reg, FrameElement::NOT_SYNCED,
- TypeInfo::Uninitialized());
- if (is_copied) entry_frame_->elements_[i].set_copied();
- entry_frame_->set_register_location(reg, i);
- }
- // Set combined number info.
- entry_frame_->elements_[i].set_type_info(info);
- }
- }
-
- // If we have incoming backward edges assert we forget all number information.
-#ifdef DEBUG
- if (direction_ == BIDIRECTIONAL) {
- for (int i = 0; i < length; ++i) {
- if (!entry_frame_->elements_[i].is_copy()) {
- ASSERT(entry_frame_->elements_[i].type_info().IsUnknown());
- }
- }
- }
-#endif
-
- // The stack pointer is at the highest synced element or the base of
- // the expression stack.
- int stack_pointer = length - 1;
- while (stack_pointer >= entry_frame_->expression_base_index() &&
- !entry_frame_->elements_[stack_pointer].is_synced()) {
- stack_pointer--;
- }
- entry_frame_->stack_pointer_ = stack_pointer;
-}
-
-
-FrameRegisterState::FrameRegisterState(VirtualFrame* frame) {
- // Copy the register locations from the code generator's frame.
- // These are the registers that will be spilled on entry to the
- // deferred code and restored on exit.
- int sp_offset = frame->fp_relative(frame->stack_pointer_);
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- int loc = frame->register_location(i);
- if (loc == VirtualFrame::kIllegalIndex) {
- registers_[i] = kIgnore;
- } else if (frame->elements_[loc].is_synced()) {
- // Needs to be restored on exit but not saved on entry.
- registers_[i] = frame->fp_relative(loc) | kSyncedFlag;
- } else {
- int offset = frame->fp_relative(loc);
- registers_[i] = (offset < sp_offset) ? kPush : offset;
- }
- }
-}
-
-
-void JumpTarget::Unuse() {
- reaching_frames_.Clear();
- merge_labels_.Clear();
- entry_frame_ = NULL;
- entry_label_.Unuse();
-}
-
-
-void JumpTarget::AddReachingFrame(VirtualFrame* frame) {
- ASSERT(reaching_frames_.length() == merge_labels_.length());
- ASSERT(entry_frame_ == NULL);
- Label fresh;
- merge_labels_.Add(fresh);
- reaching_frames_.Add(frame);
-}
-
-
-// -------------------------------------------------------------------------
-// BreakTarget implementation.
-
-void BreakTarget::set_direction(Directionality direction) {
- JumpTarget::set_direction(direction);
- ASSERT(cgen()->has_valid_frame());
- expected_height_ = cgen()->frame()->height();
-}
-
-
-void BreakTarget::CopyTo(BreakTarget* destination) {
- ASSERT(destination != NULL);
- destination->direction_ = direction_;
- destination->reaching_frames_.Rewind(0);
- destination->reaching_frames_.AddAll(reaching_frames_);
- destination->merge_labels_.Rewind(0);
- destination->merge_labels_.AddAll(merge_labels_);
- destination->entry_frame_ = entry_frame_;
- destination->entry_label_ = entry_label_;
- destination->expected_height_ = expected_height_;
-}
-
-
-void BreakTarget::Branch(Condition cc, Hint hint) {
- ASSERT(cgen()->has_valid_frame());
-
- int count = cgen()->frame()->height() - expected_height_;
- if (count > 0) {
- // We negate and branch here rather than using DoBranch's negate
- // and branch. This gives us a hook to remove statement state
- // from the frame.
- JumpTarget fall_through;
- // Branch to fall through will not negate, because it is a
- // forward-only target.
- fall_through.Branch(NegateCondition(cc), NegateHint(hint));
- Jump(); // May emit merge code here.
- fall_through.Bind();
- } else {
- DoBranch(cc, hint);
- }
-}
-
-
-DeferredCode::DeferredCode()
- : masm_(CodeGeneratorScope::Current(Isolate::Current())->masm()),
- statement_position_(masm_->positions_recorder()->
- current_statement_position()),
- position_(masm_->positions_recorder()->current_position()),
- frame_state_(CodeGeneratorScope::Current(Isolate::Current())->frame()) {
- ASSERT(statement_position_ != RelocInfo::kNoPosition);
- ASSERT(position_ != RelocInfo::kNoPosition);
-
- CodeGeneratorScope::Current(Isolate::Current())->AddDeferred(this);
-#ifdef DEBUG
- comment_ = "";
-#endif
-}
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_HEAVY_H_
-#define V8_JUMP_TARGET_HEAVY_H_
-
-#include "macro-assembler.h"
-#include "zone-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// Forward declarations.
-class FrameElement;
-class Result;
-class VirtualFrame;
-
-// -------------------------------------------------------------------------
-// Jump targets
-//
-// A jump target is an abstraction of a basic-block entry in generated
-// code. It collects all the virtual frames reaching the block by
-// forward jumps and pairs them with labels for the merge code along
-// all forward-reaching paths. When bound, an expected frame for the
-// block is determined and code is generated to merge to the expected
-// frame. For backward jumps, the merge code is generated at the edge
-// leaving the predecessor block.
-//
-// A jump target must have been reached via control flow (either by
-// jumping, branching, or falling through) at the time it is bound.
-// In particular, this means that at least one of the control-flow
-// graph edges reaching the target must be a forward edge.
-
-class JumpTarget : public ZoneObject { // Shadows are dynamically allocated.
- public:
- // Forward-only jump targets can only be reached by forward CFG edges.
- enum Directionality { FORWARD_ONLY, BIDIRECTIONAL };
-
- // Construct a jump target used to generate code and to provide
- // access to a current frame.
- explicit JumpTarget(Directionality direction)
- : direction_(direction),
- reaching_frames_(0),
- merge_labels_(0),
- entry_frame_(NULL) {
- }
-
- // Construct a jump target.
- JumpTarget()
- : direction_(FORWARD_ONLY),
- reaching_frames_(0),
- merge_labels_(0),
- entry_frame_(NULL) {
- }
-
- virtual ~JumpTarget() {}
-
- // Set the direction of the jump target.
- virtual void set_direction(Directionality direction) {
- direction_ = direction;
- }
-
- // Treat the jump target as a fresh one. The state is reset.
- void Unuse();
-
- inline CodeGenerator* cgen();
-
- Label* entry_label() { return &entry_label_; }
-
- VirtualFrame* entry_frame() const { return entry_frame_; }
- void set_entry_frame(VirtualFrame* frame) {
- entry_frame_ = frame;
- }
-
- // Predicates testing the state of the encapsulated label.
- bool is_bound() const { return entry_label_.is_bound(); }
- bool is_linked() const {
- return !is_bound() && !reaching_frames_.is_empty();
- }
- bool is_unused() const {
- // This is !is_bound() && !is_linked().
- return !is_bound() && reaching_frames_.is_empty();
- }
-
- // Emit a jump to the target. There must be a current frame at the
- // jump and there will be no current frame after the jump.
- virtual void Jump();
- virtual void Jump(Result* arg);
-
- // Emit a conditional branch to the target. There must be a current
- // frame at the branch. The current frame will fall through to the
- // code after the branch. The arg is a result that is live both at
- // the target and the fall-through.
- virtual void Branch(Condition cc, Hint hint = no_hint);
- virtual void Branch(Condition cc, Result* arg, Hint hint = no_hint);
- void Branch(Condition cc,
- Result* arg0,
- Result* arg1,
- Hint hint = no_hint);
-
- // Bind a jump target. If there is no current frame at the binding
- // site, there must be at least one frame reaching via a forward
- // jump.
- virtual void Bind();
- virtual void Bind(Result* arg);
- void Bind(Result* arg0, Result* arg1);
-
- // Emit a call to a jump target. There must be a current frame at
- // the call. The frame at the target is the same as the current
- // frame except for an extra return address on top of it. The frame
- // after the call is the same as the frame before the call.
- void Call();
-
- protected:
- // Directionality flag set at initialization time.
- Directionality direction_;
-
- // A list of frames reaching this block via forward jumps.
- ZoneList<VirtualFrame*> reaching_frames_;
-
- // A parallel list of labels for merge code.
- ZoneList<Label> merge_labels_;
-
- // The frame used on entry to the block and expected at backward
- // jumps to the block. Set when the jump target is bound, but may
- // or may not be set for forward-only blocks.
- VirtualFrame* entry_frame_;
-
- // The actual entry label of the block.
- Label entry_label_;
-
- // Implementations of Jump, Branch, and Bind with all arguments and
- // return values using the virtual frame.
- void DoJump();
- void DoBranch(Condition cc, Hint hint);
- void DoBind();
-
- private:
- // Add a virtual frame reaching this labeled block via a forward jump,
- // and a corresponding merge code label.
- void AddReachingFrame(VirtualFrame* frame);
-
- // Perform initialization required during entry frame computation
- // after setting the virtual frame element at index in frame to be
- // target.
- inline void InitializeEntryElement(int index, FrameElement* target);
-
- // Compute a frame to use for entry to this block.
- void ComputeEntryFrame();
-
- DISALLOW_COPY_AND_ASSIGN(JumpTarget);
-};
-
-
-// -------------------------------------------------------------------------
-// Break targets
-//
-// A break target is a jump target that can be used to break out of a
-// statement that keeps extra state on the stack (eg, for/in or
-// try/finally). They know the expected stack height at the target
-// and will drop state from nested statements as part of merging.
-//
-// Break targets are used for return, break, and continue targets.
-
-class BreakTarget : public JumpTarget {
- public:
- // Construct a break target.
- BreakTarget() {}
- explicit BreakTarget(JumpTarget::Directionality direction)
- : JumpTarget(direction) { }
-
- virtual ~BreakTarget() {}
-
- // Set the direction of the break target.
- virtual void set_direction(Directionality direction);
-
- // Copy the state of this break target to the destination. The
- // lists of forward-reaching frames and merge-point labels are
- // copied. All virtual frame pointers are copied, not the
- // pointed-to frames. The previous state of the destination is
- // overwritten, without deallocating pointed-to virtual frames.
- void CopyTo(BreakTarget* destination);
-
- // Emit a jump to the target. There must be a current frame at the
- // jump and there will be no current frame after the jump.
- virtual void Jump();
- virtual void Jump(Result* arg);
-
- // Emit a conditional branch to the target. There must be a current
- // frame at the branch. The current frame will fall through to the
- // code after the branch.
- virtual void Branch(Condition cc, Hint hint = no_hint);
- virtual void Branch(Condition cc, Result* arg, Hint hint = no_hint);
-
- // Bind a break target. If there is no current frame at the binding
- // site, there must be at least one frame reaching via a forward
- // jump.
- virtual void Bind();
- virtual void Bind(Result* arg);
-
- // Setter for expected height.
- void set_expected_height(int expected) { expected_height_ = expected; }
-
- private:
- // The expected height of the expression stack where the target will
- // be bound, statically known at initialization time.
- int expected_height_;
-
- DISALLOW_COPY_AND_ASSIGN(BreakTarget);
-};
-
-} } // namespace v8::internal
-
-#endif // V8_JUMP_TARGET_HEAVY_H_
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_INL_H_
-#define V8_JUMP_TARGET_INL_H_
-
-#include "virtual-frame-inl.h"
-
-#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
-#include "jump-target-heavy-inl.h"
-#else
-#include "jump-target-light-inl.h"
-#endif
-
-namespace v8 {
-namespace internal {
-
-CodeGenerator* JumpTarget::cgen() {
- return CodeGeneratorScope::Current(Isolate::Current());
-}
-
-} } // namespace v8::internal
-
-#endif // V8_JUMP_TARGET_INL_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_LIGHT_INL_H_
-#define V8_JUMP_TARGET_LIGHT_INL_H_
-
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// Construct a jump target.
-JumpTarget::JumpTarget(Directionality direction)
- : entry_frame_set_(false),
- direction_(direction),
- entry_frame_(kInvalidVirtualFrameInitializer) {
-}
-
-JumpTarget::JumpTarget()
- : entry_frame_set_(false),
- direction_(FORWARD_ONLY),
- entry_frame_(kInvalidVirtualFrameInitializer) {
-}
-
-
-BreakTarget::BreakTarget() { }
-BreakTarget::BreakTarget(JumpTarget::Directionality direction)
- : JumpTarget(direction) { }
-
-} } // namespace v8::internal
-
-#endif // V8_JUMP_TARGET_LIGHT_INL_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-
-namespace v8 {
-namespace internal {
-
-
-DeferredCode::DeferredCode()
- : masm_(CodeGeneratorScope::Current(Isolate::Current())->masm()),
- statement_position_(masm_->positions_recorder()->
- current_statement_position()),
- position_(masm_->positions_recorder()->current_position()),
- frame_state_(*CodeGeneratorScope::Current(Isolate::Current())->frame()) {
- ASSERT(statement_position_ != RelocInfo::kNoPosition);
- ASSERT(position_ != RelocInfo::kNoPosition);
-
- CodeGeneratorScope::Current(Isolate::Current())->AddDeferred(this);
-
-#ifdef DEBUG
- comment_ = "";
-#endif
-}
-
-
-// -------------------------------------------------------------------------
-// BreakTarget implementation.
-
-
-void BreakTarget::SetExpectedHeight() {
- expected_height_ = cgen()->frame()->height();
-}
-
-
-void BreakTarget::Jump() {
- ASSERT(cgen()->has_valid_frame());
-
- int count = cgen()->frame()->height() - expected_height_;
- if (count > 0) {
- cgen()->frame()->Drop(count);
- }
- DoJump();
-}
-
-
-void BreakTarget::Branch(Condition cc, Hint hint) {
- if (cc == al) {
- Jump();
- return;
- }
-
- ASSERT(cgen()->has_valid_frame());
-
- int count = cgen()->frame()->height() - expected_height_;
- if (count > 0) {
- // We negate and branch here rather than using DoBranch's negate
- // and branch. This gives us a hook to remove statement state
- // from the frame.
- JumpTarget fall_through;
- // Branch to fall through will not negate, because it is a
- // forward-only target.
- fall_through.Branch(NegateCondition(cc), NegateHint(hint));
- // Emit merge code.
- cgen()->frame()->Drop(count);
- DoJump();
- fall_through.Bind();
- } else {
- DoBranch(cc, hint);
- }
-}
-
-
-void BreakTarget::Bind() {
- if (cgen()->has_valid_frame()) {
- int count = cgen()->frame()->height() - expected_height_;
- if (count > 0) {
- cgen()->frame()->Drop(count);
- }
- }
- DoBind();
-}
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_LIGHT_H_
-#define V8_JUMP_TARGET_LIGHT_H_
-
-#include "macro-assembler.h"
-#include "zone-inl.h"
-#include "virtual-frame.h"
-
-namespace v8 {
-namespace internal {
-
-// Forward declarations.
-class FrameElement;
-class Result;
-
-// -------------------------------------------------------------------------
-// Jump targets
-//
-// A jump target is an abstraction of a basic-block entry in generated
-// code. It collects all the virtual frames reaching the block by
-// forward jumps and pairs them with labels for the merge code along
-// all forward-reaching paths. When bound, an expected frame for the
-// block is determined and code is generated to merge to the expected
-// frame. For backward jumps, the merge code is generated at the edge
-// leaving the predecessor block.
-//
-// A jump target must have been reached via control flow (either by
-// jumping, branching, or falling through) at the time it is bound.
-// In particular, this means that at least one of the control-flow
-// graph edges reaching the target must be a forward edge.
-
-class JumpTarget : public ZoneObject { // Shadows are dynamically allocated.
- public:
- // Forward-only jump targets can only be reached by forward CFG edges.
- enum Directionality { FORWARD_ONLY, BIDIRECTIONAL };
-
- // Construct a jump target.
- explicit inline JumpTarget(Directionality direction);
-
- inline JumpTarget();
-
- virtual ~JumpTarget() {}
-
- void Unuse() {
- entry_frame_set_ = false;
- entry_label_.Unuse();
- }
-
- inline CodeGenerator* cgen();
-
- Label* entry_label() { return &entry_label_; }
-
- const VirtualFrame* entry_frame() const {
- return entry_frame_set_ ? &entry_frame_ : NULL;
- }
-
- void set_entry_frame(VirtualFrame* frame) {
- entry_frame_ = *frame;
- entry_frame_set_ = true;
- }
-
- // Predicates testing the state of the encapsulated label.
- bool is_bound() const { return entry_label_.is_bound(); }
- bool is_linked() const { return entry_label_.is_linked(); }
- bool is_unused() const { return entry_label_.is_unused(); }
-
- // Copy the state of this jump target to the destination.
- inline void CopyTo(JumpTarget* destination) {
- *destination = *this;
- }
-
- // Emit a jump to the target. There must be a current frame at the
- // jump and there will be no current frame after the jump.
- virtual void Jump();
-
- // Emit a conditional branch to the target. There must be a current
- // frame at the branch. The current frame will fall through to the
- // code after the branch.
- virtual void Branch(Condition cc, Hint hint = no_hint);
-
- // Bind a jump target. If there is no current frame at the binding
- // site, there must be at least one frame reaching via a forward
- // jump.
- virtual void Bind();
-
- // Emit a call to a jump target. There must be a current frame at
- // the call. The frame at the target is the same as the current
- // frame except for an extra return address on top of it. The frame
- // after the call is the same as the frame before the call.
- void Call();
-
- protected:
- // Has an entry frame been found?
- bool entry_frame_set_;
-
- // Can we branch backwards to this label?
- Directionality direction_;
-
- // The frame used on entry to the block and expected at backward
- // jumps to the block. Set the first time something branches to this
- // jump target.
- VirtualFrame entry_frame_;
-
- // The actual entry label of the block.
- Label entry_label_;
-
- // Implementations of Jump, Branch, and Bind with all arguments and
- // return values using the virtual frame.
- void DoJump();
- void DoBranch(Condition cc, Hint hint);
- void DoBind();
-};
-
-
-// -------------------------------------------------------------------------
-// Break targets
-//
-// A break target is a jump target that can be used to break out of a
-// statement that keeps extra state on the stack (eg, for/in or
-// try/finally). They know the expected stack height at the target
-// and will drop state from nested statements as part of merging.
-//
-// Break targets are used for return, break, and continue targets.
-
-class BreakTarget : public JumpTarget {
- public:
- // Construct a break target.
- inline BreakTarget();
-
- inline BreakTarget(JumpTarget::Directionality direction);
-
- virtual ~BreakTarget() {}
-
- // Copy the state of this jump target to the destination.
- inline void CopyTo(BreakTarget* destination) {
- *destination = *this;
- }
-
- // Emit a jump to the target. There must be a current frame at the
- // jump and there will be no current frame after the jump.
- virtual void Jump();
-
- // Emit a conditional branch to the target. There must be a current
- // frame at the branch. The current frame will fall through to the
- // code after the branch.
- virtual void Branch(Condition cc, Hint hint = no_hint);
-
- // Bind a break target. If there is no current frame at the binding
- // site, there must be at least one frame reaching via a forward
- // jump.
- virtual void Bind();
-
- // Setter for expected height.
- void set_expected_height(int expected) { expected_height_ = expected; }
-
- // Uses the current frame to set the expected height.
- void SetExpectedHeight();
-
- private:
- // The expected height of the expression stack where the target will
- // be bound, statically known at initialization time.
- int expected_height_;
-};
-
-} } // namespace v8::internal
-
-#endif // V8_JUMP_TARGET_LIGHT_H_
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-#include "register-allocator-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// JumpTarget implementation.
-
-void JumpTarget::Jump() {
- DoJump();
-}
-
-
-void JumpTarget::Branch(Condition cc, Hint hint) {
- DoBranch(cc, hint);
-}
-
-
-void JumpTarget::Bind() {
- DoBind();
-}
-
-
-// -------------------------------------------------------------------------
-// ShadowTarget implementation.
-
-ShadowTarget::ShadowTarget(BreakTarget* shadowed) {
- ASSERT(shadowed != NULL);
- other_target_ = shadowed;
-
-#ifdef DEBUG
- is_shadowing_ = true;
-#endif
- // While shadowing this shadow target saves the state of the original.
- shadowed->CopyTo(this);
-
- // The original's state is reset.
- shadowed->Unuse();
- ASSERT(cgen()->has_valid_frame());
- shadowed->set_expected_height(cgen()->frame()->height());
-}
-
-
-void ShadowTarget::StopShadowing() {
- ASSERT(is_shadowing_);
-
- // The states of this target, which was shadowed, and the original
- // target, which was shadowing, are swapped.
- BreakTarget temp;
- other_target_->CopyTo(&temp);
- CopyTo(other_target_);
- temp.CopyTo(this);
- temp.Unuse();
-
-#ifdef DEBUG
- is_shadowing_ = false;
-#endif
-}
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_JUMP_TARGET_H_
-#define V8_JUMP_TARGET_H_
-
-#if V8_TARGET_ARCH_IA32
-#include "jump-target-heavy.h"
-#elif V8_TARGET_ARCH_X64
-#include "jump-target-heavy.h"
-#elif V8_TARGET_ARCH_ARM
-#include "jump-target-light.h"
-#elif V8_TARGET_ARCH_MIPS
-#include "jump-target-light.h"
-#else
-#error Unsupported target architecture.
-#endif
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Shadow break targets
-//
-// A shadow break target represents a break target that is temporarily
-// shadowed by another one (represented by the original during
-// shadowing). They are used to catch jumps to labels in certain
-// contexts, e.g. try blocks. After shadowing ends, the formerly
-// shadowed target is again represented by the original and the
-// ShadowTarget can be used as a jump target in its own right,
-// representing the formerly shadowing target.
-
-class ShadowTarget : public BreakTarget {
- public:
- // Construct a shadow jump target. After construction the shadow
- // target object holds the state of the original target, and the
- // original target is actually a fresh one that intercepts control
- // flow intended for the shadowed one.
- explicit ShadowTarget(BreakTarget* shadowed);
-
- virtual ~ShadowTarget() {}
-
- // End shadowing. After shadowing ends, the original jump target
- // again gives access to the formerly shadowed target and the shadow
- // target object gives access to the formerly shadowing target.
- void StopShadowing();
-
- // During shadowing, the currently shadowing target. After
- // shadowing, the target that was shadowed.
- BreakTarget* other_target() const { return other_target_; }
-
- private:
- // During shadowing, the currently shadowing target. After
- // shadowing, the target that was shadowed.
- BreakTarget* other_target_;
-
-#ifdef DEBUG
- bool is_shadowing_;
-#endif
-
- DISALLOW_COPY_AND_ASSIGN(ShadowTarget);
-};
-
-} } // namespace v8::internal
-
-#endif // V8_JUMP_TARGET_H_
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "string-stream.h"
#include "ast-inl.h"
-#include "jump-target-inl.h"
namespace v8 {
namespace internal {
bool is_catch_block,
bool* ok) {
// Parse the statement and collect escaping labels.
- ZoneList<BreakTarget*>* target_list = new ZoneList<BreakTarget*>(0);
+ ZoneList<Label*>* target_list = new ZoneList<Label*>(0);
TargetCollector collector(target_list);
Statement* stat;
{ Target target(&this->target_stack_, &collector);
Expect(Token::TRY, CHECK_OK);
- ZoneList<BreakTarget*>* target_list = new ZoneList<BreakTarget*>(0);
+ ZoneList<Label*>* target_list = new ZoneList<Label*>(0);
TargetCollector collector(target_list);
Block* try_block;
// then we will need to collect jump targets from the catch block. Since
// we don't know yet if there will be a finally block, we always collect
// the jump targets.
- ZoneList<BreakTarget*>* catch_target_list = new ZoneList<BreakTarget*>(0);
+ ZoneList<Label*>* catch_target_list = new ZoneList<Label*>(0);
TargetCollector catch_collector(catch_target_list);
bool has_catch = false;
if (tok == Token::CATCH) {
}
Expression* cond = ParseExpression(true, CHECK_OK);
- if (cond != NULL) cond->set_is_loop_condition(true);
Expect(Token::RPAREN, CHECK_OK);
// Allow do-statements to be terminated with and without
Expect(Token::WHILE, CHECK_OK);
Expect(Token::LPAREN, CHECK_OK);
Expression* cond = ParseExpression(true, CHECK_OK);
- if (cond != NULL) cond->set_is_loop_condition(true);
Expect(Token::RPAREN, CHECK_OK);
Statement* body = ParseStatement(NULL, CHECK_OK);
Expression* cond = NULL;
if (peek() != Token::SEMICOLON) {
cond = ParseExpression(true, CHECK_OK);
- if (cond != NULL) cond->set_is_loop_condition(true);
}
Expect(Token::SEMICOLON, CHECK_OK);
}
-void Parser::RegisterTargetUse(BreakTarget* target, Target* stop) {
+void Parser::RegisterTargetUse(Label* target, Target* stop) {
// Register that a break target found at the given stop in the
// target stack has been used from the top of the target stack. Add
// the break target to any TargetCollectors passed on the stack.
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
BreakableStatement* LookupBreakTarget(Handle<String> label, bool* ok);
IterationStatement* LookupContinueTarget(Handle<String> label, bool* ok);
- void RegisterTargetUse(BreakTarget* target, Target* stop);
+ void RegisterTargetUse(Label* target, Target* stop);
// Factory methods.
IndentedScope(AstPrinter* printer, const char* txt, AstNode* node = NULL)
: ast_printer_(printer) {
ast_printer_->PrintIndented(txt);
- if (node != NULL && node->AsExpression() != NULL) {
- Expression* expr = node->AsExpression();
- bool printed_first = false;
- if ((expr->type() != NULL) && (expr->type()->IsKnown())) {
- ast_printer_->Print(" (type = ");
- ast_printer_->Print(StaticType::Type2String(expr->type()));
- printed_first = true;
- }
- if (printed_first) ast_printer_->Print(")");
- }
ast_printer_->Print("\n");
ast_printer_->inc_indent();
}
void AstPrinter::PrintLiteralWithModeIndented(const char* info,
Variable* var,
- Handle<Object> value,
- StaticType* type) {
+ Handle<Object> value) {
if (var == NULL) {
PrintLiteralIndented(info, value, true);
} else {
EmbeddedVector<char, 256> buf;
int pos = OS::SNPrintF(buf, "%s (mode = %s", info,
Variable::Mode2String(var->mode()));
- if (type->IsKnown()) {
- pos += OS::SNPrintF(buf + pos, ", type = %s",
- StaticType::Type2String(type));
- }
OS::SNPrintF(buf + pos, ")");
PrintLiteralIndented(buf.start(), value, true);
}
IndentedScope indent(this, "PARAMS");
for (int i = 0; i < scope->num_parameters(); i++) {
PrintLiteralWithModeIndented("VAR", scope->parameter(i),
- scope->parameter(i)->name(),
- scope->parameter(i)->type());
+ scope->parameter(i)->name());
}
}
}
// var or const declarations
PrintLiteralWithModeIndented(Variable::Mode2String(node->mode()),
node->proxy()->AsVariable(),
- node->proxy()->name(),
- node->proxy()->AsVariable()->type());
+ node->proxy()->name());
} else {
// function declarations
PrintIndented("FUNCTION ");
void AstPrinter::VisitVariableProxy(VariableProxy* node) {
- PrintLiteralWithModeIndented("VAR PROXY", node->AsVariable(), node->name(),
- node->type());
+ PrintLiteralWithModeIndented("VAR PROXY", node->AsVariable(), node->name());
Variable* var = node->var();
if (var != NULL && var->rewrite() != NULL) {
IndentedScope indent(this);
void AstPrinter::VisitCountOperation(CountOperation* node) {
EmbeddedVector<char, 128> buf;
- if (node->type()->IsKnown()) {
- OS::SNPrintF(buf, "%s %s (type = %s)",
- (node->is_prefix() ? "PRE" : "POST"),
- Token::Name(node->op()),
- StaticType::Type2String(node->type()));
- } else {
- OS::SNPrintF(buf, "%s %s", (node->is_prefix() ? "PRE" : "POST"),
- Token::Name(node->op()));
- }
+ OS::SNPrintF(buf, "%s %s", (node->is_prefix() ? "PRE" : "POST"),
+ Token::Name(node->op()));
PrintIndentedVisit(buf.start(), node->expression());
}
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
void PrintLiteralIndented(const char* info, Handle<Object> value, bool quote);
void PrintLiteralWithModeIndented(const char* info,
Variable* var,
- Handle<Object> value,
- StaticType* type);
+ Handle<Object> value);
void PrintLabelsIndented(const char* info, ZoneStringList* labels);
void inc_indent() { indent_++; }
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_REGISTER_ALLOCATOR_INL_H_
-#define V8_REGISTER_ALLOCATOR_INL_H_
-
-#include "codegen.h"
-#include "register-allocator.h"
-
-#if V8_TARGET_ARCH_IA32
-#include "ia32/register-allocator-ia32-inl.h"
-#elif V8_TARGET_ARCH_X64
-#include "x64/register-allocator-x64-inl.h"
-#elif V8_TARGET_ARCH_ARM
-#include "arm/register-allocator-arm-inl.h"
-#elif V8_TARGET_ARCH_MIPS
-#include "mips/register-allocator-mips-inl.h"
-#else
-#error Unsupported target architecture.
-#endif
-
-
-namespace v8 {
-namespace internal {
-
-Result::Result(const Result& other) {
- other.CopyTo(this);
-}
-
-
-Result& Result::operator=(const Result& other) {
- if (this != &other) {
- Unuse();
- other.CopyTo(this);
- }
- return *this;
-}
-
-
-Result::~Result() {
- if (is_register()) {
- CodeGeneratorScope::Current(Isolate::Current())->allocator()->Unuse(reg());
- }
-}
-
-
-void Result::Unuse() {
- if (is_register()) {
- CodeGeneratorScope::Current(Isolate::Current())->allocator()->Unuse(reg());
- }
- invalidate();
-}
-
-
-void Result::CopyTo(Result* destination) const {
- destination->value_ = value_;
- if (is_register()) {
- CodeGeneratorScope::Current(Isolate::Current())->allocator()->Use(reg());
- }
-}
-
-
-bool RegisterAllocator::is_used(Register reg) {
- return registers_.is_used(ToNumber(reg));
-}
-
-
-int RegisterAllocator::count(Register reg) {
- return registers_.count(ToNumber(reg));
-}
-
-
-void RegisterAllocator::Use(Register reg) {
- registers_.Use(ToNumber(reg));
-}
-
-
-void RegisterAllocator::Unuse(Register reg) {
- registers_.Unuse(ToNumber(reg));
-}
-
-
-TypeInfo Result::type_info() const {
- ASSERT(is_valid());
- return TypeInfo::FromInt(TypeInfoField::decode(value_));
-}
-
-
-void Result::set_type_info(TypeInfo info) {
- ASSERT(is_valid());
- value_ &= ~TypeInfoField::mask();
- value_ |= TypeInfoField::encode(info.ToInt());
-}
-
-
-bool Result::is_number() const {
- return type_info().IsNumber();
-}
-
-
-bool Result::is_smi() const {
- return type_info().IsSmi();
-}
-
-
-bool Result::is_integer32() const {
- return type_info().IsInteger32();
-}
-
-
-bool Result::is_double() const {
- return type_info().IsDouble();
-}
-
-} } // namespace v8::internal
-
-#endif // V8_REGISTER_ALLOCATOR_INL_H_
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Result implementation.
-
-
-Result::Result(Register reg, TypeInfo info) {
- ASSERT(reg.is_valid() && !RegisterAllocator::IsReserved(reg));
- CodeGeneratorScope::Current(Isolate::Current())->allocator()->Use(reg);
- value_ = TypeField::encode(REGISTER)
- | TypeInfoField::encode(info.ToInt())
- | DataField::encode(reg.code_);
-}
-
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-
-Result RegisterAllocator::AllocateWithoutSpilling() {
- // Return the first free register, if any.
- int num = registers_.ScanForFreeRegister();
- if (num == RegisterAllocator::kInvalidRegister) {
- return Result();
- }
- return Result(RegisterAllocator::ToRegister(num));
-}
-
-
-Result RegisterAllocator::Allocate() {
- Result result = AllocateWithoutSpilling();
- if (!result.is_valid()) {
- // Ask the current frame to spill a register.
- ASSERT(cgen_->has_valid_frame());
- Register free_reg = cgen_->frame()->SpillAnyRegister();
- if (free_reg.is_valid()) {
- ASSERT(!is_used(free_reg));
- return Result(free_reg);
- }
- }
- return result;
-}
-
-
-Result RegisterAllocator::Allocate(Register target) {
- // If the target is not referenced, it can simply be allocated.
- if (!is_used(RegisterAllocator::ToNumber(target))) {
- return Result(target);
- }
- // If the target is only referenced in the frame, it can be spilled and
- // then allocated.
- ASSERT(cgen_->has_valid_frame());
- if (cgen_->frame()->is_used(RegisterAllocator::ToNumber(target)) &&
- count(target) == 1) {
- cgen_->frame()->Spill(target);
- ASSERT(!is_used(RegisterAllocator::ToNumber(target)));
- return Result(target);
- }
- // Otherwise (if it's referenced outside the frame) we cannot allocate it.
- return Result();
-}
-
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_REGISTER_ALLOCATOR_H_
-#define V8_REGISTER_ALLOCATOR_H_
-
-#include "macro-assembler.h"
-#include "type-info.h"
-
-#if V8_TARGET_ARCH_IA32
-#include "ia32/register-allocator-ia32.h"
-#elif V8_TARGET_ARCH_X64
-#include "x64/register-allocator-x64.h"
-#elif V8_TARGET_ARCH_ARM
-#include "arm/register-allocator-arm.h"
-#elif V8_TARGET_ARCH_MIPS
-#include "mips/register-allocator-mips.h"
-#else
-#error Unsupported target architecture.
-#endif
-
-namespace v8 {
-namespace internal {
-
-
-// -------------------------------------------------------------------------
-// Results
-//
-// Results encapsulate the compile-time values manipulated by the code
-// generator. They can represent registers or constants.
-
-class Result BASE_EMBEDDED {
- public:
- enum Type {
- INVALID,
- REGISTER,
- CONSTANT
- };
-
- // Construct an invalid result.
- Result() { invalidate(); }
-
- // Construct a register Result.
- explicit Result(Register reg, TypeInfo info = TypeInfo::Unknown());
-
- // Construct a Result whose value is a compile-time constant.
- explicit Result(Handle<Object> value) {
- ZoneObjectList* constant_list = Isolate::Current()->result_constant_list();
- TypeInfo info = TypeInfo::TypeFromValue(value);
- value_ = TypeField::encode(CONSTANT)
- | TypeInfoField::encode(info.ToInt())
- | IsUntaggedInt32Field::encode(false)
- | DataField::encode(constant_list->length());
- constant_list->Add(value);
- }
-
- // The copy constructor and assignment operators could each create a new
- // register reference.
- inline Result(const Result& other);
-
- inline Result& operator=(const Result& other);
-
- inline ~Result();
-
- inline void Unuse();
-
- Type type() const { return TypeField::decode(value_); }
-
- void invalidate() { value_ = TypeField::encode(INVALID); }
-
- inline TypeInfo type_info() const;
- inline void set_type_info(TypeInfo info);
- inline bool is_number() const;
- inline bool is_smi() const;
- inline bool is_integer32() const;
- inline bool is_double() const;
-
- bool is_valid() const { return type() != INVALID; }
- bool is_register() const { return type() == REGISTER; }
- bool is_constant() const { return type() == CONSTANT; }
-
- // An untagged int32 Result contains a signed int32 in a register
- // or as a constant. These are only allowed in a side-effect-free
- // int32 calculation, and if a non-int32 input shows up or an overflow
- // occurs, we bail out and drop all the int32 values. Constants are
- // not converted to int32 until they are loaded into a register.
- bool is_untagged_int32() const {
- return IsUntaggedInt32Field::decode(value_);
- }
- void set_untagged_int32(bool value) {
- value_ &= ~IsUntaggedInt32Field::mask();
- value_ |= IsUntaggedInt32Field::encode(value);
- }
-
- Register reg() const {
- ASSERT(is_register());
- uint32_t reg = DataField::decode(value_);
- Register result;
- result.code_ = reg;
- return result;
- }
-
- Handle<Object> handle() const {
- ASSERT(type() == CONSTANT);
- return Isolate::Current()->result_constant_list()->
- at(DataField::decode(value_));
- }
-
- // Move this result to an arbitrary register. The register is not
- // necessarily spilled from the frame or even singly-referenced outside
- // it.
- void ToRegister();
-
- // Move this result to a specified register. The register is spilled from
- // the frame, and the register is singly-referenced (by this result)
- // outside the frame.
- void ToRegister(Register reg);
-
- private:
- uint32_t value_;
-
- // Declare BitFields with template parameters <type, start, size>.
- class TypeField: public BitField<Type, 0, 2> {};
- class TypeInfoField : public BitField<int, 2, 6> {};
- class IsUntaggedInt32Field : public BitField<bool, 8, 1> {};
- class DataField: public BitField<uint32_t, 9, 32 - 9> {};
-
- inline void CopyTo(Result* destination) const;
-
- friend class CodeGeneratorScope;
-};
-
-
-// -------------------------------------------------------------------------
-// Register file
-//
-// The register file tracks reference counts for the processor registers.
-// It is used by both the register allocator and the virtual frame.
-
-class RegisterFile BASE_EMBEDDED {
- public:
- RegisterFile() { Reset(); }
-
- void Reset() {
- for (int i = 0; i < kNumRegisters; i++) {
- ref_counts_[i] = 0;
- }
- }
-
- // Predicates and accessors for the reference counts.
- bool is_used(int num) {
- ASSERT(0 <= num && num < kNumRegisters);
- return ref_counts_[num] > 0;
- }
-
- int count(int num) {
- ASSERT(0 <= num && num < kNumRegisters);
- return ref_counts_[num];
- }
-
- // Record a use of a register by incrementing its reference count.
- void Use(int num) {
- ASSERT(0 <= num && num < kNumRegisters);
- ref_counts_[num]++;
- }
-
- // Record that a register will no longer be used by decrementing its
- // reference count.
- void Unuse(int num) {
- ASSERT(is_used(num));
- ref_counts_[num]--;
- }
-
- // Copy the reference counts from this register file to the other.
- void CopyTo(RegisterFile* other) {
- for (int i = 0; i < kNumRegisters; i++) {
- other->ref_counts_[i] = ref_counts_[i];
- }
- }
-
- private:
- // C++ doesn't like zero length arrays, so we make the array length 1 even if
- // we don't need it.
- static const int kNumRegisters =
- (RegisterAllocatorConstants::kNumRegisters == 0) ?
- 1 : RegisterAllocatorConstants::kNumRegisters;
-
- int ref_counts_[kNumRegisters];
-
- // Very fast inlined loop to find a free register. Used in
- // RegisterAllocator::AllocateWithoutSpilling. Returns
- // kInvalidRegister if no free register found.
- int ScanForFreeRegister() {
- for (int i = 0; i < RegisterAllocatorConstants::kNumRegisters; i++) {
- if (!is_used(i)) return i;
- }
- return RegisterAllocatorConstants::kInvalidRegister;
- }
-
- friend class RegisterAllocator;
-};
-
-
-// -------------------------------------------------------------------------
-// Register allocator
-//
-
-class RegisterAllocator BASE_EMBEDDED {
- public:
- static const int kNumRegisters =
- RegisterAllocatorConstants::kNumRegisters;
- static const int kInvalidRegister =
- RegisterAllocatorConstants::kInvalidRegister;
-
- explicit RegisterAllocator(CodeGenerator* cgen) : cgen_(cgen) {}
-
- // True if the register is reserved by the code generator, false if it
- // can be freely used by the allocator Defined in the
- // platform-specific XXX-inl.h files..
- static inline bool IsReserved(Register reg);
-
- // Convert between (unreserved) assembler registers and allocator
- // numbers. Defined in the platform-specific XXX-inl.h files.
- static inline int ToNumber(Register reg);
- static inline Register ToRegister(int num);
-
- // Predicates and accessors for the registers' reference counts.
- bool is_used(int num) { return registers_.is_used(num); }
- inline bool is_used(Register reg);
-
- int count(int num) { return registers_.count(num); }
- inline int count(Register reg);
-
- // Explicitly record a reference to a register.
- void Use(int num) { registers_.Use(num); }
- inline void Use(Register reg);
-
- // Explicitly record that a register will no longer be used.
- void Unuse(int num) { registers_.Unuse(num); }
- inline void Unuse(Register reg);
-
- // Reset the register reference counts to free all non-reserved registers.
- void Reset() { registers_.Reset(); }
-
- // Initialize the register allocator for entry to a JS function. On
- // entry, the (non-reserved) registers used by the JS calling
- // convention are referenced and the other (non-reserved) registers
- // are free.
- inline void Initialize();
-
- // Allocate a free register and return a register result if possible or
- // fail and return an invalid result.
- Result Allocate();
-
- // Allocate a specific register if possible, spilling it from the
- // current frame if necessary, or else fail and return an invalid
- // result.
- Result Allocate(Register target);
-
- // Allocate a free register without spilling any from the current
- // frame or fail and return an invalid result.
- Result AllocateWithoutSpilling();
-
- // Allocate a free byte register without spilling any from the current
- // frame or fail and return an invalid result.
- Result AllocateByteRegisterWithoutSpilling();
-
- // Copy the internal state to a register file, to be restored later by
- // RestoreFrom.
- void SaveTo(RegisterFile* register_file) {
- registers_.CopyTo(register_file);
- }
-
- // Restore the internal state.
- void RestoreFrom(RegisterFile* register_file) {
- register_file->CopyTo(®isters_);
- }
-
- private:
- CodeGenerator* cgen_;
- RegisterFile registers_;
-};
-
-} } // namespace v8::internal
-
-#endif // V8_REGISTER_ALLOCATOR_H_
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
namespace v8 {
namespace internal {
-class AstOptimizer: public AstVisitor {
- public:
- explicit AstOptimizer() : has_function_literal_(false) {}
-
- void Optimize(ZoneList<Statement*>* statements);
-
- private:
- // Used for loop condition analysis. Cleared before visiting a loop
- // condition, set when a function literal is visited.
- bool has_function_literal_;
-
- // Helpers
- void OptimizeArguments(ZoneList<Expression*>* arguments);
-
- // Node visitors.
-#define DEF_VISIT(type) \
- virtual void Visit##type(type* node);
- AST_NODE_LIST(DEF_VISIT)
-#undef DEF_VISIT
-
- DISALLOW_COPY_AND_ASSIGN(AstOptimizer);
-};
-
-
-void AstOptimizer::Optimize(ZoneList<Statement*>* statements) {
- int len = statements->length();
- for (int i = 0; i < len; i++) {
- Visit(statements->at(i));
- }
-}
-
-
-void AstOptimizer::OptimizeArguments(ZoneList<Expression*>* arguments) {
- for (int i = 0; i < arguments->length(); i++) {
- Visit(arguments->at(i));
- }
-}
-
-
-void AstOptimizer::VisitBlock(Block* node) {
- Optimize(node->statements());
-}
-
-
-void AstOptimizer::VisitExpressionStatement(ExpressionStatement* node) {
- node->expression()->set_no_negative_zero(true);
- Visit(node->expression());
-}
-
-
-void AstOptimizer::VisitIfStatement(IfStatement* node) {
- node->condition()->set_no_negative_zero(true);
- Visit(node->condition());
- Visit(node->then_statement());
- if (node->HasElseStatement()) {
- Visit(node->else_statement());
- }
-}
-
-
-void AstOptimizer::VisitDoWhileStatement(DoWhileStatement* node) {
- node->cond()->set_no_negative_zero(true);
- Visit(node->cond());
- Visit(node->body());
-}
-
-
-void AstOptimizer::VisitWhileStatement(WhileStatement* node) {
- has_function_literal_ = false;
- node->cond()->set_no_negative_zero(true);
- Visit(node->cond());
- node->set_may_have_function_literal(has_function_literal_);
- Visit(node->body());
-}
-
-
-void AstOptimizer::VisitForStatement(ForStatement* node) {
- if (node->init() != NULL) {
- Visit(node->init());
- }
- if (node->cond() != NULL) {
- has_function_literal_ = false;
- node->cond()->set_no_negative_zero(true);
- Visit(node->cond());
- node->set_may_have_function_literal(has_function_literal_);
- }
- Visit(node->body());
- if (node->next() != NULL) {
- Visit(node->next());
- }
-}
-
-
-void AstOptimizer::VisitForInStatement(ForInStatement* node) {
- Visit(node->each());
- Visit(node->enumerable());
- Visit(node->body());
-}
-
-
-void AstOptimizer::VisitTryCatchStatement(TryCatchStatement* node) {
- Visit(node->try_block());
- Visit(node->catch_var());
- Visit(node->catch_block());
-}
-
-
-void AstOptimizer::VisitTryFinallyStatement(TryFinallyStatement* node) {
- Visit(node->try_block());
- Visit(node->finally_block());
-}
-
-
-void AstOptimizer::VisitSwitchStatement(SwitchStatement* node) {
- node->tag()->set_no_negative_zero(true);
- Visit(node->tag());
- for (int i = 0; i < node->cases()->length(); i++) {
- CaseClause* clause = node->cases()->at(i);
- if (!clause->is_default()) {
- Visit(clause->label());
- }
- Optimize(clause->statements());
- }
-}
-
-
-void AstOptimizer::VisitContinueStatement(ContinueStatement* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitBreakStatement(BreakStatement* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitDeclaration(Declaration* node) {
- // Will not be reached by the current optimizations.
- USE(node);
-}
-
-
-void AstOptimizer::VisitEmptyStatement(EmptyStatement* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitReturnStatement(ReturnStatement* node) {
- Visit(node->expression());
-}
-
-
-void AstOptimizer::VisitWithEnterStatement(WithEnterStatement* node) {
- Visit(node->expression());
-}
-
-
-void AstOptimizer::VisitWithExitStatement(WithExitStatement* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitDebuggerStatement(DebuggerStatement* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitFunctionLiteral(FunctionLiteral* node) {
- has_function_literal_ = true;
-}
-
-
-void AstOptimizer::VisitSharedFunctionInfoLiteral(
- SharedFunctionInfoLiteral* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitConditional(Conditional* node) {
- node->condition()->set_no_negative_zero(true);
- Visit(node->condition());
- Visit(node->then_expression());
- Visit(node->else_expression());
-}
-
-
-void AstOptimizer::VisitVariableProxy(VariableProxy* node) {
- Variable* var = node->AsVariable();
- if (var != NULL) {
- if (var->type()->IsKnown()) {
- node->type()->CopyFrom(var->type());
- } else if (node->type()->IsLikelySmi()) {
- var->type()->SetAsLikelySmi();
- }
-
- if (FLAG_safe_int32_compiler) {
- if (var->IsStackAllocated() &&
- !var->is_arguments() &&
- var->mode() != Variable::CONST) {
- node->set_side_effect_free(true);
- }
- }
- }
-}
-
-
-void AstOptimizer::VisitLiteral(Literal* node) {
- Handle<Object> literal = node->handle();
- if (literal->IsSmi()) {
- node->type()->SetAsLikelySmi();
- node->set_side_effect_free(true);
- } else if (literal->IsHeapNumber()) {
- if (node->to_int32()) {
- // Any HeapNumber has an int32 value if it is the input to a bit op.
- node->set_side_effect_free(true);
- } else {
- double double_value = HeapNumber::cast(*literal)->value();
- int32_t int32_value = DoubleToInt32(double_value);
- node->set_side_effect_free(double_value == int32_value);
- }
- }
-}
-
-
-void AstOptimizer::VisitRegExpLiteral(RegExpLiteral* node) {
- USE(node);
-}
-
-
-void AstOptimizer::VisitArrayLiteral(ArrayLiteral* node) {
- for (int i = 0; i < node->values()->length(); i++) {
- Visit(node->values()->at(i));
- }
-}
-
-void AstOptimizer::VisitObjectLiteral(ObjectLiteral* node) {
- for (int i = 0; i < node->properties()->length(); i++) {
- Visit(node->properties()->at(i)->key());
- Visit(node->properties()->at(i)->value());
- }
-}
-
-
-void AstOptimizer::VisitCatchExtensionObject(CatchExtensionObject* node) {
- Visit(node->key());
- Visit(node->value());
-}
-
-
-void AstOptimizer::VisitAssignment(Assignment* node) {
- switch (node->op()) {
- case Token::INIT_VAR:
- case Token::INIT_CONST:
- case Token::ASSIGN:
- // No type can be infered from the general assignment.
- break;
- case Token::ASSIGN_BIT_OR:
- case Token::ASSIGN_BIT_XOR:
- case Token::ASSIGN_BIT_AND:
- case Token::ASSIGN_SHL:
- case Token::ASSIGN_SAR:
- case Token::ASSIGN_SHR:
- node->type()->SetAsLikelySmiIfUnknown();
- node->target()->type()->SetAsLikelySmiIfUnknown();
- node->value()->type()->SetAsLikelySmiIfUnknown();
- node->value()->set_to_int32(true);
- node->value()->set_no_negative_zero(true);
- break;
- case Token::ASSIGN_ADD:
- case Token::ASSIGN_SUB:
- case Token::ASSIGN_MUL:
- case Token::ASSIGN_DIV:
- case Token::ASSIGN_MOD:
- if (node->type()->IsLikelySmi()) {
- node->target()->type()->SetAsLikelySmiIfUnknown();
- node->value()->type()->SetAsLikelySmiIfUnknown();
- }
- break;
- default:
- UNREACHABLE();
- break;
- }
-
- Visit(node->target());
- Visit(node->value());
-
- switch (node->op()) {
- case Token::INIT_VAR:
- case Token::INIT_CONST:
- case Token::ASSIGN:
- // Pure assignment copies the type from the value.
- node->type()->CopyFrom(node->value()->type());
- break;
- case Token::ASSIGN_BIT_OR:
- case Token::ASSIGN_BIT_XOR:
- case Token::ASSIGN_BIT_AND:
- case Token::ASSIGN_SHL:
- case Token::ASSIGN_SAR:
- case Token::ASSIGN_SHR:
- // Should have been setup above already.
- break;
- case Token::ASSIGN_ADD:
- case Token::ASSIGN_SUB:
- case Token::ASSIGN_MUL:
- case Token::ASSIGN_DIV:
- case Token::ASSIGN_MOD:
- if (node->type()->IsUnknown()) {
- if (node->target()->type()->IsLikelySmi() ||
- node->value()->type()->IsLikelySmi()) {
- node->type()->SetAsLikelySmi();
- }
- }
- break;
- default:
- UNREACHABLE();
- break;
- }
-
- // Since this is an assignment. We have to propagate this node's type to the
- // variable.
- VariableProxy* proxy = node->target()->AsVariableProxy();
- if (proxy != NULL) {
- Variable* var = proxy->AsVariable();
- if (var != NULL) {
- StaticType* var_type = var->type();
- if (var_type->IsUnknown()) {
- var_type->CopyFrom(node->type());
- } else if (var_type->IsLikelySmi()) {
- // We do not reset likely types to Unknown.
- }
- }
- }
-}
-
-
-void AstOptimizer::VisitThrow(Throw* node) {
- Visit(node->exception());
-}
-
-
-void AstOptimizer::VisitProperty(Property* node) {
- node->key()->set_no_negative_zero(true);
- Visit(node->obj());
- Visit(node->key());
-}
-
-
-void AstOptimizer::VisitCall(Call* node) {
- Visit(node->expression());
- OptimizeArguments(node->arguments());
-}
-
-
-void AstOptimizer::VisitCallNew(CallNew* node) {
- Visit(node->expression());
- OptimizeArguments(node->arguments());
-}
-
-
-void AstOptimizer::VisitCallRuntime(CallRuntime* node) {
- OptimizeArguments(node->arguments());
-}
-
-
-void AstOptimizer::VisitUnaryOperation(UnaryOperation* node) {
- if (node->op() == Token::ADD || node->op() == Token::SUB) {
- node->expression()->set_no_negative_zero(node->no_negative_zero());
- } else {
- node->expression()->set_no_negative_zero(true);
- }
- Visit(node->expression());
- if (FLAG_safe_int32_compiler) {
- switch (node->op()) {
- case Token::BIT_NOT:
- node->expression()->set_no_negative_zero(true);
- node->expression()->set_to_int32(true);
- // Fall through.
- case Token::ADD:
- case Token::SUB:
- node->set_side_effect_free(node->expression()->side_effect_free());
- break;
- case Token::NOT:
- case Token::DELETE:
- case Token::TYPEOF:
- case Token::VOID:
- break;
- default:
- UNREACHABLE();
- break;
- }
- } else if (node->op() == Token::BIT_NOT) {
- node->expression()->set_to_int32(true);
- }
-}
-
-
-void AstOptimizer::VisitCountOperation(CountOperation* node) {
- // Count operations assume that they work on Smis.
- node->expression()->set_no_negative_zero(node->is_prefix() ?
- true :
- node->no_negative_zero());
- node->type()->SetAsLikelySmiIfUnknown();
- node->expression()->type()->SetAsLikelySmiIfUnknown();
- Visit(node->expression());
-}
-
-
-static bool CouldBeNegativeZero(AstNode* node) {
- Literal* literal = node->AsLiteral();
- if (literal != NULL) {
- Handle<Object> handle = literal->handle();
- if (handle->IsString() || handle->IsSmi()) {
- return false;
- } else if (handle->IsHeapNumber()) {
- double double_value = HeapNumber::cast(*handle)->value();
- if (double_value != 0) {
- return false;
- }
- }
- }
- BinaryOperation* binary = node->AsBinaryOperation();
- if (binary != NULL && Token::IsBitOp(binary->op())) {
- return false;
- }
- return true;
-}
-
-
-static bool CouldBePositiveZero(AstNode* node) {
- Literal* literal = node->AsLiteral();
- if (literal != NULL) {
- Handle<Object> handle = literal->handle();
- if (handle->IsSmi()) {
- if (Smi::cast(*handle) != Smi::FromInt(0)) {
- return false;
- }
- } else if (handle->IsHeapNumber()) {
- // Heap number literal can't be +0, because that's a Smi.
- return false;
- }
- }
- return true;
-}
-
-
-void AstOptimizer::VisitBinaryOperation(BinaryOperation* node) {
- // Depending on the operation we can propagate this node's type down the
- // AST nodes.
- Token::Value op = node->op();
- switch (op) {
- case Token::COMMA:
- case Token::OR:
- node->left()->set_no_negative_zero(true);
- node->right()->set_no_negative_zero(node->no_negative_zero());
- break;
- case Token::AND:
- node->left()->set_no_negative_zero(node->no_negative_zero());
- node->right()->set_no_negative_zero(node->no_negative_zero());
- break;
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND:
- case Token::SHL:
- case Token::SAR:
- case Token::SHR:
- node->type()->SetAsLikelySmiIfUnknown();
- node->left()->type()->SetAsLikelySmiIfUnknown();
- node->right()->type()->SetAsLikelySmiIfUnknown();
- node->left()->set_to_int32(true);
- node->right()->set_to_int32(true);
- node->left()->set_no_negative_zero(true);
- node->right()->set_no_negative_zero(true);
- break;
- case Token::MUL: {
- VariableProxy* lvar_proxy = node->left()->AsVariableProxy();
- VariableProxy* rvar_proxy = node->right()->AsVariableProxy();
- if (lvar_proxy != NULL && rvar_proxy != NULL) {
- Variable* lvar = lvar_proxy->AsVariable();
- Variable* rvar = rvar_proxy->AsVariable();
- if (lvar != NULL && rvar != NULL) {
- if (lvar->mode() == Variable::VAR && rvar->mode() == Variable::VAR) {
- Slot* lslot = lvar->AsSlot();
- Slot* rslot = rvar->AsSlot();
- if (lslot->type() == rslot->type() &&
- (lslot->type() == Slot::PARAMETER ||
- lslot->type() == Slot::LOCAL) &&
- lslot->index() == rslot->index()) {
- // A number squared doesn't give negative zero.
- node->set_no_negative_zero(true);
- }
- }
- }
- }
- }
- case Token::ADD:
- case Token::SUB:
- case Token::DIV:
- case Token::MOD: {
- if (node->type()->IsLikelySmi()) {
- node->left()->type()->SetAsLikelySmiIfUnknown();
- node->right()->type()->SetAsLikelySmiIfUnknown();
- }
- if (op == Token::ADD && (!CouldBeNegativeZero(node->left()) ||
- !CouldBeNegativeZero(node->right()))) {
- node->left()->set_no_negative_zero(true);
- node->right()->set_no_negative_zero(true);
- } else if (op == Token::SUB && (!CouldBeNegativeZero(node->left()) ||
- !CouldBePositiveZero(node->right()))) {
- node->left()->set_no_negative_zero(true);
- node->right()->set_no_negative_zero(true);
- } else {
- node->left()->set_no_negative_zero(node->no_negative_zero());
- node->right()->set_no_negative_zero(node->no_negative_zero());
- }
- if (node->op() == Token::DIV) {
- node->right()->set_no_negative_zero(false);
- } else if (node->op() == Token::MOD) {
- node->right()->set_no_negative_zero(true);
- }
- break;
- }
- default:
- UNREACHABLE();
- break;
- }
-
- Visit(node->left());
- Visit(node->right());
-
- // After visiting the operand nodes we have to check if this node's type
- // can be updated. If it does, then we can push that information down
- // towards the leaves again if the new information is an upgrade over the
- // previous type of the operand nodes.
- if (node->type()->IsUnknown()) {
- if (node->left()->type()->IsLikelySmi() ||
- node->right()->type()->IsLikelySmi()) {
- node->type()->SetAsLikelySmi();
- }
- if (node->type()->IsLikelySmi()) {
- // The type of this node changed to LIKELY_SMI. Propagate this knowledge
- // down through the nodes.
- if (node->left()->type()->IsUnknown()) {
- node->left()->type()->SetAsLikelySmi();
- Visit(node->left());
- }
- if (node->right()->type()->IsUnknown()) {
- node->right()->type()->SetAsLikelySmi();
- Visit(node->right());
- }
- }
- }
-
- if (FLAG_safe_int32_compiler) {
- switch (node->op()) {
- case Token::COMMA:
- case Token::OR:
- case Token::AND:
- break;
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND:
- case Token::SHL:
- case Token::SAR:
- case Token::SHR:
- // Add one to the number of bit operations in this expression.
- node->set_num_bit_ops(1);
- // Fall through.
- case Token::ADD:
- case Token::SUB:
- case Token::MUL:
- case Token::DIV:
- case Token::MOD:
- node->set_side_effect_free(node->left()->side_effect_free() &&
- node->right()->side_effect_free());
- node->set_num_bit_ops(node->num_bit_ops() +
- node->left()->num_bit_ops() +
- node->right()->num_bit_ops());
- if (!node->no_negative_zero() && node->op() == Token::MUL) {
- node->set_side_effect_free(false);
- }
- break;
- default:
- UNREACHABLE();
- break;
- }
- }
-}
-
-
-void AstOptimizer::VisitCompareOperation(CompareOperation* node) {
- if (node->type()->IsKnown()) {
- // Propagate useful information down towards the leaves.
- node->left()->type()->SetAsLikelySmiIfUnknown();
- node->right()->type()->SetAsLikelySmiIfUnknown();
- }
-
- node->left()->set_no_negative_zero(true);
- // Only [[HasInstance]] has the right argument passed unchanged to it.
- node->right()->set_no_negative_zero(true);
-
- Visit(node->left());
- Visit(node->right());
-
- // After visiting the operand nodes we have to check if this node's type
- // can be updated. If it does, then we can push that information down
- // towards the leaves again if the new information is an upgrade over the
- // previous type of the operand nodes.
- if (node->type()->IsUnknown()) {
- if (node->left()->type()->IsLikelySmi() ||
- node->right()->type()->IsLikelySmi()) {
- node->type()->SetAsLikelySmi();
- }
- if (node->type()->IsLikelySmi()) {
- // The type of this node changed to LIKELY_SMI. Propagate this knowledge
- // down through the nodes.
- if (node->left()->type()->IsUnknown()) {
- node->left()->type()->SetAsLikelySmi();
- Visit(node->left());
- }
- if (node->right()->type()->IsUnknown()) {
- node->right()->type()->SetAsLikelySmi();
- Visit(node->right());
- }
- }
- }
-}
-
-
-void AstOptimizer::VisitCompareToNull(CompareToNull* node) {
- Visit(node->expression());
-}
-
-
-void AstOptimizer::VisitThisFunction(ThisFunction* node) {
- USE(node);
-}
-
-
class Processor: public AstVisitor {
public:
explicit Processor(Variable* result)
}
-// Assumes code has been parsed and scopes have been analyzed. Mutates the
-// AST, so the AST should not continue to be used in the case of failure.
-bool Rewriter::Analyze(CompilationInfo* info) {
- FunctionLiteral* function = info->function();
- ASSERT(function != NULL && function->scope() != NULL);
-
- ZoneList<Statement*>* body = function->body();
- if (FLAG_optimize_ast && !body->is_empty()) {
- AstOptimizer optimizer;
- optimizer.Optimize(body);
- if (optimizer.HasStackOverflow()) return false;
- }
- return true;
-}
-
-
} } // namespace v8::internal
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// Assumes code has been parsed and scopes have been analyzed. Mutates the
// AST, so the AST should not continue to be used in the case of failure.
static bool Rewrite(CompilationInfo* info);
-
- // Perform a suite of simple non-iterative analyses of the AST. Mark
- // expressions that are likely smis, expressions without side effects,
- // expressions whose value will be converted to Int32, and expressions in a
- // context where +0 and -0 are treated the same.
- //
- // Assumes code has been parsed and scopes have been analyzed. Mutates the
- // AST, so the AST should not continue to be used in the case of failure.
- static bool Analyze(CompilationInfo* info);
};
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
namespace internal {
// ----------------------------------------------------------------------------
-// Implementation StaticType.
-
-
-const char* StaticType::Type2String(StaticType* type) {
- switch (type->kind_) {
- case UNKNOWN:
- return "UNKNOWN";
- case LIKELY_SMI:
- return "LIKELY_SMI";
- default:
- UNREACHABLE();
- }
- return "UNREACHABLE";
-}
-
-
-// ----------------------------------------------------------------------------
// Implementation Variable.
-
const char* Variable::Mode2String(Mode mode) {
switch (mode) {
case VAR: return "VAR";
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
namespace v8 {
namespace internal {
-// Variables and AST expression nodes can track their "type" to enable
-// optimizations and removal of redundant checks when generating code.
-
-class StaticType {
- public:
- enum Kind {
- UNKNOWN,
- LIKELY_SMI
- };
-
- StaticType() : kind_(UNKNOWN) {}
-
- bool Is(Kind kind) const { return kind_ == kind; }
-
- bool IsKnown() const { return !Is(UNKNOWN); }
- bool IsUnknown() const { return Is(UNKNOWN); }
- bool IsLikelySmi() const { return Is(LIKELY_SMI); }
-
- void CopyFrom(StaticType* other) {
- kind_ = other->kind_;
- }
-
- static const char* Type2String(StaticType* type);
-
- // LIKELY_SMI accessors
- void SetAsLikelySmi() {
- kind_ = LIKELY_SMI;
- }
-
- void SetAsLikelySmiIfUnknown() {
- if (IsUnknown()) {
- SetAsLikelySmi();
- }
- }
-
- private:
- Kind kind_;
-};
-
-
// The AST refers to variables via VariableProxies - placeholders for the actual
// variables. Variables themselves are never directly referred to from the AST,
// they are maintained by scopes, and referred to from VariableProxies and Slots
Expression* rewrite() const { return rewrite_; }
void set_rewrite(Expression* expr) { rewrite_ = expr; }
- StaticType* type() { return &type_; }
-
private:
Scope* scope_;
Handle<String> name_;
Variable* local_if_not_shadowed_;
- // Static type information
- StaticType type_;
-
// Code generation.
// rewrite_ is usually a Slot or a Property, but may be any expression.
Expression* rewrite_;
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_VIRTUAL_FRAME_HEAVY_INL_H_
-#define V8_VIRTUAL_FRAME_HEAVY_INL_H_
-
-#include "type-info.h"
-#include "register-allocator.h"
-#include "scopes.h"
-#include "register-allocator-inl.h"
-#include "codegen-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// On entry to a function, the virtual frame already contains the receiver,
-// the parameters, and a return address. All frame elements are in memory.
-VirtualFrame::VirtualFrame()
- : elements_(parameter_count() + local_count() + kPreallocatedElements),
- stack_pointer_(parameter_count() + 1) { // 0-based index of TOS.
- for (int i = 0; i <= stack_pointer_; i++) {
- elements_.Add(FrameElement::MemoryElement(TypeInfo::Unknown()));
- }
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- register_locations_[i] = kIllegalIndex;
- }
-}
-
-
-// When cloned, a frame is a deep copy of the original.
-VirtualFrame::VirtualFrame(VirtualFrame* original)
- : elements_(original->element_count()),
- stack_pointer_(original->stack_pointer_) {
- elements_.AddAll(original->elements_);
- // Copy register locations from original.
- memcpy(®ister_locations_,
- original->register_locations_,
- sizeof(register_locations_));
-}
-
-
-void VirtualFrame::PushFrameSlotAt(int index) {
- elements_.Add(CopyElementAt(index));
-}
-
-
-void VirtualFrame::Push(Register reg, TypeInfo info) {
- if (is_used(reg)) {
- int index = register_location(reg);
- FrameElement element = CopyElementAt(index, info);
- elements_.Add(element);
- } else {
- Use(reg, element_count());
- FrameElement element =
- FrameElement::RegisterElement(reg, FrameElement::NOT_SYNCED, info);
- elements_.Add(element);
- }
-}
-
-
-bool VirtualFrame::ConstantPoolOverflowed() {
- return FrameElement::ConstantPoolOverflowed();
-}
-
-
-bool VirtualFrame::Equals(VirtualFrame* other) {
-#ifdef DEBUG
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (register_location(i) != other->register_location(i)) {
- return false;
- }
- }
- if (element_count() != other->element_count()) return false;
-#endif
- if (stack_pointer_ != other->stack_pointer_) return false;
- for (int i = 0; i < element_count(); i++) {
- if (!elements_[i].Equals(other->elements_[i])) return false;
- }
-
- return true;
-}
-
-
-void VirtualFrame::SetTypeForLocalAt(int index, TypeInfo info) {
- elements_[local0_index() + index].set_type_info(info);
-}
-
-
-// Make the type of all elements be MEMORY.
-void VirtualFrame::SpillAll() {
- for (int i = 0; i < element_count(); i++) {
- SpillElementAt(i);
- }
-}
-
-
-void VirtualFrame::PrepareForReturn() {
- // Spill all locals. This is necessary to make sure all locals have
- // the right value when breaking at the return site in the debugger.
- for (int i = 0; i < expression_base_index(); i++) {
- SpillElementAt(i);
- }
-}
-
-
-void VirtualFrame::SetTypeForParamAt(int index, TypeInfo info) {
- elements_[param0_index() + index].set_type_info(info);
-}
-
-
-void VirtualFrame::Nip(int num_dropped) {
- ASSERT(num_dropped >= 0);
- if (num_dropped == 0) return;
- Result tos = Pop();
- if (num_dropped > 1) {
- Drop(num_dropped - 1);
- }
- SetElementAt(0, &tos);
-}
-
-
-void VirtualFrame::Push(Smi* value) {
- Push(Handle<Object> (value));
-}
-
-
-int VirtualFrame::register_location(Register reg) {
- return register_locations_[RegisterAllocator::ToNumber(reg)];
-}
-
-
-void VirtualFrame::set_register_location(Register reg, int index) {
- register_locations_[RegisterAllocator::ToNumber(reg)] = index;
-}
-
-
-bool VirtualFrame::is_used(Register reg) {
- return register_locations_[RegisterAllocator::ToNumber(reg)]
- != kIllegalIndex;
-}
-
-
-void VirtualFrame::SetElementAt(int index, Handle<Object> value) {
- Result temp(value);
- SetElementAt(index, &temp);
-}
-
-
-Result VirtualFrame::CallStub(CodeStub* stub, int arg_count) {
- PrepareForCall(arg_count, arg_count);
- return RawCallStub(stub);
-}
-
-
-int VirtualFrame::parameter_count() {
- return cgen()->scope()->num_parameters();
-}
-
-
-int VirtualFrame::local_count() {
- return cgen()->scope()->num_stack_slots();
-}
-
-} } // namespace v8::internal
-
-#endif // V8_VIRTUAL_FRAME_HEAVY_INL_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-void VirtualFrame::SetElementAt(int index, Result* value) {
- int frame_index = element_count() - index - 1;
- ASSERT(frame_index >= 0);
- ASSERT(frame_index < element_count());
- ASSERT(value->is_valid());
- FrameElement original = elements_[frame_index];
-
- // Early exit if the element is the same as the one being set.
- bool same_register = original.is_register()
- && value->is_register()
- && original.reg().is(value->reg());
- bool same_constant = original.is_constant()
- && value->is_constant()
- && original.handle().is_identical_to(value->handle());
- if (same_register || same_constant) {
- value->Unuse();
- return;
- }
-
- InvalidateFrameSlotAt(frame_index);
-
- if (value->is_register()) {
- if (is_used(value->reg())) {
- // The register already appears on the frame. Either the existing
- // register element, or the new element at frame_index, must be made
- // a copy.
- int i = register_location(value->reg());
-
- if (i < frame_index) {
- // The register FrameElement is lower in the frame than the new copy.
- elements_[frame_index] = CopyElementAt(i);
- } else {
- // There was an early bailout for the case of setting a
- // register element to itself.
- ASSERT(i != frame_index);
- elements_[frame_index] = elements_[i];
- elements_[i] = CopyElementAt(frame_index);
- if (elements_[frame_index].is_synced()) {
- elements_[i].set_sync();
- }
- elements_[frame_index].clear_sync();
- set_register_location(value->reg(), frame_index);
- for (int j = i + 1; j < element_count(); j++) {
- if (elements_[j].is_copy() && elements_[j].index() == i) {
- elements_[j].set_index(frame_index);
- }
- }
- }
- } else {
- // The register value->reg() was not already used on the frame.
- Use(value->reg(), frame_index);
- elements_[frame_index] =
- FrameElement::RegisterElement(value->reg(),
- FrameElement::NOT_SYNCED,
- value->type_info());
- }
- } else {
- ASSERT(value->is_constant());
- elements_[frame_index] =
- FrameElement::ConstantElement(value->handle(),
- FrameElement::NOT_SYNCED);
- }
- value->Unuse();
-}
-
-
-// Create a duplicate of an existing valid frame element.
-// We can pass an optional number type information that will override the
-// existing information about the backing element. The new information must
-// not conflict with the existing type information and must be equally or
-// more precise. The default parameter value kUninitialized means that there
-// is no additional information.
-FrameElement VirtualFrame::CopyElementAt(int index, TypeInfo info) {
- ASSERT(index >= 0);
- ASSERT(index < element_count());
-
- FrameElement target = elements_[index];
- FrameElement result;
-
- switch (target.type()) {
- case FrameElement::CONSTANT:
- // We do not copy constants and instead return a fresh unsynced
- // constant.
- result = FrameElement::ConstantElement(target.handle(),
- FrameElement::NOT_SYNCED);
- break;
-
- case FrameElement::COPY:
- // We do not allow copies of copies, so we follow one link to
- // the actual backing store of a copy before making a copy.
- index = target.index();
- ASSERT(elements_[index].is_memory() || elements_[index].is_register());
- // Fall through.
-
- case FrameElement::MEMORY: // Fall through.
- case FrameElement::REGISTER: {
- // All copies are backed by memory or register locations.
- result.set_type(FrameElement::COPY);
- result.clear_copied();
- result.clear_sync();
- result.set_index(index);
- elements_[index].set_copied();
- // Update backing element's number information.
- TypeInfo existing = elements_[index].type_info();
- ASSERT(!existing.IsUninitialized());
- // Assert that the new type information (a) does not conflict with the
- // existing one and (b) is equally or more precise.
- ASSERT((info.ToInt() & existing.ToInt()) == existing.ToInt());
- ASSERT((info.ToInt() | existing.ToInt()) == info.ToInt());
-
- elements_[index].set_type_info(!info.IsUninitialized()
- ? info
- : existing);
- break;
- }
- case FrameElement::INVALID:
- // We should not try to copy invalid elements.
- UNREACHABLE();
- break;
- }
- return result;
-}
-
-
-// Modify the state of the virtual frame to match the actual frame by adding
-// extra in-memory elements to the top of the virtual frame. The extra
-// elements will be externally materialized on the actual frame (eg, by
-// pushing an exception handler). No code is emitted.
-void VirtualFrame::Adjust(int count) {
- ASSERT(count >= 0);
- ASSERT(stack_pointer_ == element_count() - 1);
-
- for (int i = 0; i < count; i++) {
- elements_.Add(FrameElement::MemoryElement(TypeInfo::Unknown()));
- }
- stack_pointer_ += count;
-}
-
-
-void VirtualFrame::ForgetElements(int count) {
- ASSERT(count >= 0);
- ASSERT(element_count() >= count);
-
- for (int i = 0; i < count; i++) {
- FrameElement last = elements_.RemoveLast();
- if (last.is_register()) {
- // A hack to properly count register references for the code
- // generator's current frame and also for other frames. The
- // same code appears in PrepareMergeTo.
- if (cgen()->frame() == this) {
- Unuse(last.reg());
- } else {
- set_register_location(last.reg(), kIllegalIndex);
- }
- }
- }
-}
-
-
-// Make the type of the element at a given index be MEMORY.
-void VirtualFrame::SpillElementAt(int index) {
- if (!elements_[index].is_valid()) return;
-
- SyncElementAt(index);
- // Number type information is preserved.
- // Copies get their number information from their backing element.
- TypeInfo info;
- if (!elements_[index].is_copy()) {
- info = elements_[index].type_info();
- } else {
- info = elements_[elements_[index].index()].type_info();
- }
- // The element is now in memory. Its copied flag is preserved.
- FrameElement new_element = FrameElement::MemoryElement(info);
- if (elements_[index].is_copied()) {
- new_element.set_copied();
- }
- if (elements_[index].is_untagged_int32()) {
- new_element.set_untagged_int32(true);
- }
- if (elements_[index].is_register()) {
- Unuse(elements_[index].reg());
- }
- elements_[index] = new_element;
-}
-
-
-// Clear the dirty bit for the element at a given index.
-void VirtualFrame::SyncElementAt(int index) {
- if (index <= stack_pointer_) {
- if (!elements_[index].is_synced()) SyncElementBelowStackPointer(index);
- } else if (index == stack_pointer_ + 1) {
- SyncElementByPushing(index);
- } else {
- SyncRange(stack_pointer_ + 1, index);
- }
-}
-
-
-void VirtualFrame::PrepareMergeTo(VirtualFrame* expected) {
- // Perform state changes on this frame that will make merge to the
- // expected frame simpler or else increase the likelihood that his
- // frame will match another.
- for (int i = 0; i < element_count(); i++) {
- FrameElement source = elements_[i];
- FrameElement target = expected->elements_[i];
-
- if (!target.is_valid() ||
- (target.is_memory() && !source.is_memory() && source.is_synced())) {
- // No code needs to be generated to invalidate valid elements.
- // No code needs to be generated to move values to memory if
- // they are already synced. We perform those moves here, before
- // merging.
- if (source.is_register()) {
- // If the frame is the code generator's current frame, we have
- // to decrement both the frame-internal and global register
- // counts.
- if (cgen()->frame() == this) {
- Unuse(source.reg());
- } else {
- set_register_location(source.reg(), kIllegalIndex);
- }
- }
- elements_[i] = target;
- } else if (target.is_register() && !target.is_synced() &&
- !source.is_memory()) {
- // If an element's target is a register that doesn't need to be
- // synced, and the element is not in memory, then the sync state
- // of the element is irrelevant. We clear the sync bit.
- ASSERT(source.is_valid());
- elements_[i].clear_sync();
- }
- }
-}
-
-
-void VirtualFrame::PrepareForCall(int spilled_args, int dropped_args) {
- ASSERT(height() >= dropped_args);
- ASSERT(height() >= spilled_args);
- ASSERT(dropped_args <= spilled_args);
-
- SyncRange(0, element_count() - 1);
- // Spill registers.
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (is_used(i)) {
- SpillElementAt(register_location(i));
- }
- }
-
- // Spill the arguments.
- for (int i = element_count() - spilled_args; i < element_count(); i++) {
- if (!elements_[i].is_memory()) {
- SpillElementAt(i);
- }
- }
-
- // Forget the frame elements that will be popped by the call.
- Forget(dropped_args);
-}
-
-
-// If there are any registers referenced only by the frame, spill one.
-Register VirtualFrame::SpillAnyRegister() {
- // Find the leftmost (ordered by register number) register whose only
- // reference is in the frame.
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (is_used(i) && cgen()->allocator()->count(i) == 1) {
- SpillElementAt(register_location(i));
- ASSERT(!cgen()->allocator()->is_used(i));
- return RegisterAllocator::ToRegister(i);
- }
- }
- return no_reg;
-}
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_VIRTUAL_FRAME_INL_H_
-#define V8_VIRTUAL_FRAME_INL_H_
-
-#include "virtual-frame.h"
-
-#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
-#include "virtual-frame-heavy-inl.h"
-#else
-#include "virtual-frame-light-inl.h"
-#endif
-
-#endif // V8_VIRTUAL_FRAME_INL_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_VIRTUAL_FRAME_LIGHT_INL_H_
-#define V8_VIRTUAL_FRAME_LIGHT_INL_H_
-
-#include "codegen.h"
-#include "register-allocator.h"
-#include "scopes.h"
-#include "type-info.h"
-
-#include "codegen-inl.h"
-#include "jump-target-light-inl.h"
-
-namespace v8 {
-namespace internal {
-
-VirtualFrame::VirtualFrame(InvalidVirtualFrameInitializer* dummy)
- : element_count_(0),
- top_of_stack_state_(NO_TOS_REGISTERS),
- register_allocation_map_(0),
- tos_known_smi_map_(0) { }
-
-
-// On entry to a function, the virtual frame already contains the receiver,
-// the parameters, and a return address. All frame elements are in memory.
-VirtualFrame::VirtualFrame()
- : element_count_(parameter_count() + 2),
- top_of_stack_state_(NO_TOS_REGISTERS),
- register_allocation_map_(0),
- tos_known_smi_map_(0) { }
-
-
-// When cloned, a frame is a deep copy of the original.
-VirtualFrame::VirtualFrame(VirtualFrame* original)
- : element_count_(original->element_count()),
- top_of_stack_state_(original->top_of_stack_state_),
- register_allocation_map_(original->register_allocation_map_),
- tos_known_smi_map_(0) { }
-
-
-bool VirtualFrame::Equals(const VirtualFrame* other) {
- ASSERT(element_count() == other->element_count());
- if (top_of_stack_state_ != other->top_of_stack_state_) return false;
- if (register_allocation_map_ != other->register_allocation_map_) return false;
- if (tos_known_smi_map_ != other->tos_known_smi_map_) return false;
-
- return true;
-}
-
-
-void VirtualFrame::PrepareForReturn() {
- // Don't bother flushing tos registers as returning does not require more
- // access to the expression stack.
- top_of_stack_state_ = NO_TOS_REGISTERS;
-}
-
-
-VirtualFrame::RegisterAllocationScope::RegisterAllocationScope(
- CodeGenerator* cgen)
- : cgen_(cgen),
- old_is_spilled_(
- Isolate::Current()->is_virtual_frame_in_spilled_scope()) {
- Isolate::Current()->set_is_virtual_frame_in_spilled_scope(false);
- if (old_is_spilled_) {
- VirtualFrame* frame = cgen->frame();
- if (frame != NULL) {
- frame->AssertIsSpilled();
- }
- }
-}
-
-
-VirtualFrame::RegisterAllocationScope::~RegisterAllocationScope() {
- Isolate::Current()->set_is_virtual_frame_in_spilled_scope(old_is_spilled_);
- if (old_is_spilled_) {
- VirtualFrame* frame = cgen_->frame();
- if (frame != NULL) {
- frame->SpillAll();
- }
- }
-}
-
-
-CodeGenerator* VirtualFrame::cgen() const {
- return CodeGeneratorScope::Current(Isolate::Current());
-}
-
-
-MacroAssembler* VirtualFrame::masm() { return cgen()->masm(); }
-
-
-void VirtualFrame::CallStub(CodeStub* stub, int arg_count) {
- if (arg_count != 0) Forget(arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- masm()->CallStub(stub);
-}
-
-
-int VirtualFrame::parameter_count() const {
- return cgen()->scope()->num_parameters();
-}
-
-
-int VirtualFrame::local_count() const {
- return cgen()->scope()->num_stack_slots();
-}
-
-
-int VirtualFrame::frame_pointer() const { return parameter_count() + 3; }
-
-
-int VirtualFrame::context_index() { return frame_pointer() - 1; }
-
-
-int VirtualFrame::function_index() { return frame_pointer() - 2; }
-
-
-int VirtualFrame::local0_index() const { return frame_pointer() + 2; }
-
-
-int VirtualFrame::fp_relative(int index) {
- ASSERT(index < element_count());
- ASSERT(frame_pointer() < element_count()); // FP is on the frame.
- return (frame_pointer() - index) * kPointerSize;
-}
-
-
-int VirtualFrame::expression_base_index() const {
- return local0_index() + local_count();
-}
-
-
-int VirtualFrame::height() const {
- return element_count() - expression_base_index();
-}
-
-
-MemOperand VirtualFrame::LocalAt(int index) {
- ASSERT(0 <= index);
- ASSERT(index < local_count());
- return MemOperand(fp, kLocal0Offset - index * kPointerSize);
-}
-
-} } // namespace v8::internal
-
-#endif // V8_VIRTUAL_FRAME_LIGHT_INL_H_
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-void VirtualFrame::Adjust(int count) {
- ASSERT(count >= 0);
- RaiseHeight(count, 0);
-}
-
-
-// If there are any registers referenced only by the frame, spill one.
-Register VirtualFrame::SpillAnyRegister() {
- UNIMPLEMENTED();
- return no_reg;
-}
-
-
-InvalidVirtualFrameInitializer* kInvalidVirtualFrameInitializer = NULL;
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// VirtualFrame implementation.
-
-// Specialization of List::ResizeAdd to non-inlined version for FrameElements.
-// The function ResizeAdd becomes a real function, whose implementation is the
-// inlined ResizeAddInternal.
-template <>
-void List<FrameElement,
- FreeStoreAllocationPolicy>::ResizeAdd(const FrameElement& element) {
- ResizeAddInternal(element);
-}
-
-} } // namespace v8::internal
+++ /dev/null
-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_VIRTUAL_FRAME_H_
-#define V8_VIRTUAL_FRAME_H_
-
-#include "frame-element.h"
-#include "macro-assembler.h"
-
-#include "list-inl.h"
-#include "utils.h"
-
-#if V8_TARGET_ARCH_IA32
-#include "ia32/virtual-frame-ia32.h"
-#elif V8_TARGET_ARCH_X64
-#include "x64/virtual-frame-x64.h"
-#elif V8_TARGET_ARCH_ARM
-#include "arm/virtual-frame-arm.h"
-#elif V8_TARGET_ARCH_MIPS
-#include "mips/virtual-frame-mips.h"
-#else
-#error Unsupported target architecture.
-#endif
-
-namespace v8 {
-namespace internal {
-
-// Add() on List is inlined, ResizeAdd() called by Add() is inlined except for
-// Lists of FrameElements, and ResizeAddInternal() is inlined in ResizeAdd().
-template <>
-void List<FrameElement,
- FreeStoreAllocationPolicy>::ResizeAdd(const FrameElement& element);
-} } // namespace v8::internal
-
-#endif // V8_VIRTUAL_FRAME_H_
#if defined(V8_TARGET_ARCH_X64)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "deoptimizer.h"
#include "full-codegen.h"
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-#ifndef V8_X64_CODEGEN_X64_INL_H_
-#define V8_X64_CODEGEN_X64_INL_H_
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm_)
-
-// Platform-specific inline functions.
-
-void DeferredCode::Jump() { __ jmp(&entry_label_); }
-void DeferredCode::Branch(Condition cc) { __ j(cc, &entry_label_); }
-
-#undef __
-
-} } // namespace v8::internal
-
-#endif // V8_X64_CODEGEN_X64_INL_H_
#if defined(V8_TARGET_ARCH_X64)
-#include "bootstrapper.h"
-#include "code-stubs.h"
-#include "codegen-inl.h"
-#include "compiler.h"
-#include "debug.h"
-#include "ic-inl.h"
-#include "parser.h"
-#include "regexp-macro-assembler.h"
-#include "register-allocator-inl.h"
-#include "scopes.h"
-#include "virtual-frame-inl.h"
+#include "codegen.h"
namespace v8 {
namespace internal {
-#define __ ACCESS_MASM(masm)
-
-// -------------------------------------------------------------------------
-// Platform-specific FrameRegisterState functions.
-
-void FrameRegisterState::Save(MacroAssembler* masm) const {
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- int action = registers_[i];
- if (action == kPush) {
- __ push(RegisterAllocator::ToRegister(i));
- } else if (action != kIgnore && (action & kSyncedFlag) == 0) {
- __ movq(Operand(rbp, action), RegisterAllocator::ToRegister(i));
- }
- }
-}
-
-
-void FrameRegisterState::Restore(MacroAssembler* masm) const {
- // Restore registers in reverse order due to the stack.
- for (int i = RegisterAllocator::kNumRegisters - 1; i >= 0; i--) {
- int action = registers_[i];
- if (action == kPush) {
- __ pop(RegisterAllocator::ToRegister(i));
- } else if (action != kIgnore) {
- action &= ~kSyncedFlag;
- __ movq(RegisterAllocator::ToRegister(i), Operand(rbp, action));
- }
- }
-}
-
-
-#undef __
-#define __ ACCESS_MASM(masm_)
-
-// -------------------------------------------------------------------------
-// Platform-specific DeferredCode functions.
-
-void DeferredCode::SaveRegisters() {
- frame_state_.Save(masm_);
-}
-
-
-void DeferredCode::RestoreRegisters() {
- frame_state_.Restore(masm_);
-}
-
-
// -------------------------------------------------------------------------
// Platform-specific RuntimeCallHelper functions.
-void VirtualFrameRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
- frame_state_->Save(masm);
-}
-
-
-void VirtualFrameRuntimeCallHelper::AfterCall(MacroAssembler* masm) const {
- frame_state_->Restore(masm);
-}
-
-
void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const {
masm->EnterInternalFrame();
}
}
-// -------------------------------------------------------------------------
-// CodeGenState implementation.
-
-CodeGenState::CodeGenState(CodeGenerator* owner)
- : owner_(owner),
- destination_(NULL),
- previous_(NULL) {
- owner_->set_state(this);
-}
-
-
-CodeGenState::CodeGenState(CodeGenerator* owner,
- ControlDestination* destination)
- : owner_(owner),
- destination_(destination),
- previous_(owner->state()) {
- owner_->set_state(this);
-}
-
-
-CodeGenState::~CodeGenState() {
- ASSERT(owner_->state() == this);
- owner_->set_state(previous_);
-}
-
-
-// -------------------------------------------------------------------------
-// CodeGenerator implementation.
-
-CodeGenerator::CodeGenerator(MacroAssembler* masm)
- : deferred_(8),
- masm_(masm),
- info_(NULL),
- frame_(NULL),
- allocator_(NULL),
- state_(NULL),
- loop_nesting_(0),
- function_return_is_shadowed_(false),
- in_spilled_code_(false) {
-}
-
-
-// Calling conventions:
-// rbp: caller's frame pointer
-// rsp: stack pointer
-// rdi: called JS function
-// rsi: callee's context
-
-void CodeGenerator::Generate(CompilationInfo* info) {
- // Record the position for debugging purposes.
- CodeForFunctionPosition(info->function());
- Comment cmnt(masm_, "[ function compiled by virtual frame code generator");
-
- // Initialize state.
- info_ = info;
- ASSERT(allocator_ == NULL);
- RegisterAllocator register_allocator(this);
- allocator_ = ®ister_allocator;
- ASSERT(frame_ == NULL);
- frame_ = new VirtualFrame();
- set_in_spilled_code(false);
-
- // Adjust for function-level loop nesting.
- ASSERT_EQ(0, loop_nesting_);
- loop_nesting_ = info->is_in_loop() ? 1 : 0;
-
- Isolate::Current()->set_jump_target_compiling_deferred_code(false);
-
- {
- CodeGenState state(this);
- // Entry:
- // Stack: receiver, arguments, return address.
- // rbp: caller's frame pointer
- // rsp: stack pointer
- // rdi: called JS function
- // rsi: callee's context
- allocator_->Initialize();
-
-#ifdef DEBUG
- if (strlen(FLAG_stop_at) > 0 &&
- info->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
- frame_->SpillAll();
- __ int3();
- }
-#endif
-
- frame_->Enter();
-
- // Allocate space for locals and initialize them.
- frame_->AllocateStackSlots();
-
- // Allocate the local context if needed.
- int heap_slots = scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
- if (heap_slots > 0) {
- Comment cmnt(masm_, "[ allocate local context");
- // Allocate local context.
- // Get outer context and create a new context based on it.
- frame_->PushFunction();
- Result context;
- if (heap_slots <= FastNewContextStub::kMaximumSlots) {
- FastNewContextStub stub(heap_slots);
- context = frame_->CallStub(&stub, 1);
- } else {
- context = frame_->CallRuntime(Runtime::kNewContext, 1);
- }
-
- // Update context local.
- frame_->SaveContextRegister();
-
- // Verify that the runtime call result and rsi agree.
- if (FLAG_debug_code) {
- __ cmpq(context.reg(), rsi);
- __ Assert(equal, "Runtime::NewContext should end up in rsi");
- }
- }
-
- // TODO(1241774): Improve this code:
- // 1) only needed if we have a context
- // 2) no need to recompute context ptr every single time
- // 3) don't copy parameter operand code from SlotOperand!
- {
- Comment cmnt2(masm_, "[ copy context parameters into .context");
- // Note that iteration order is relevant here! If we have the same
- // parameter twice (e.g., function (x, y, x)), and that parameter
- // needs to be copied into the context, it must be the last argument
- // passed to the parameter that needs to be copied. This is a rare
- // case so we don't check for it, instead we rely on the copying
- // order: such a parameter is copied repeatedly into the same
- // context location and thus the last value is what is seen inside
- // the function.
- for (int i = 0; i < scope()->num_parameters(); i++) {
- Variable* par = scope()->parameter(i);
- Slot* slot = par->AsSlot();
- if (slot != NULL && slot->type() == Slot::CONTEXT) {
- // The use of SlotOperand below is safe in unspilled code
- // because the slot is guaranteed to be a context slot.
- //
- // There are no parameters in the global scope.
- ASSERT(!scope()->is_global_scope());
- frame_->PushParameterAt(i);
- Result value = frame_->Pop();
- value.ToRegister();
-
- // SlotOperand loads context.reg() with the context object
- // stored to, used below in RecordWrite.
- Result context = allocator_->Allocate();
- ASSERT(context.is_valid());
- __ movq(SlotOperand(slot, context.reg()), value.reg());
- int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_valid());
- frame_->Spill(context.reg());
- frame_->Spill(value.reg());
- __ RecordWrite(context.reg(), offset, value.reg(), scratch.reg());
- }
- }
- }
-
- // Store the arguments object. This must happen after context
- // initialization because the arguments object may be stored in
- // the context.
- if (ArgumentsMode() != NO_ARGUMENTS_ALLOCATION) {
- StoreArgumentsObject(true);
- }
-
- // Initialize ThisFunction reference if present.
- if (scope()->is_function_scope() && scope()->function() != NULL) {
- frame_->Push(FACTORY->the_hole_value());
- StoreToSlot(scope()->function()->AsSlot(), NOT_CONST_INIT);
- }
-
- // Initialize the function return target after the locals are set
- // up, because it needs the expected frame height from the frame.
- function_return_.set_direction(JumpTarget::BIDIRECTIONAL);
- function_return_is_shadowed_ = false;
-
- // Generate code to 'execute' declarations and initialize functions
- // (source elements). In case of an illegal redeclaration we need to
- // handle that instead of processing the declarations.
- if (scope()->HasIllegalRedeclaration()) {
- Comment cmnt(masm_, "[ illegal redeclarations");
- scope()->VisitIllegalRedeclaration(this);
- } else {
- Comment cmnt(masm_, "[ declarations");
- ProcessDeclarations(scope()->declarations());
- // Bail out if a stack-overflow exception occurred when processing
- // declarations.
- if (HasStackOverflow()) return;
- }
-
- if (FLAG_trace) {
- frame_->CallRuntime(Runtime::kTraceEnter, 0);
- // Ignore the return value.
- }
- CheckStack();
-
- // Compile the body of the function in a vanilla state. Don't
- // bother compiling all the code if the scope has an illegal
- // redeclaration.
- if (!scope()->HasIllegalRedeclaration()) {
- Comment cmnt(masm_, "[ function body");
-#ifdef DEBUG
- bool is_builtin = Isolate::Current()->bootstrapper()->IsActive();
- bool should_trace =
- is_builtin ? FLAG_trace_builtin_calls : FLAG_trace_calls;
- if (should_trace) {
- frame_->CallRuntime(Runtime::kDebugTrace, 0);
- // Ignore the return value.
- }
-#endif
- VisitStatements(info->function()->body());
-
- // Handle the return from the function.
- if (has_valid_frame()) {
- // If there is a valid frame, control flow can fall off the end of
- // the body. In that case there is an implicit return statement.
- ASSERT(!function_return_is_shadowed_);
- CodeForReturnPosition(info->function());
- frame_->PrepareForReturn();
- Result undefined(FACTORY->undefined_value());
- if (function_return_.is_bound()) {
- function_return_.Jump(&undefined);
- } else {
- function_return_.Bind(&undefined);
- GenerateReturnSequence(&undefined);
- }
- } else if (function_return_.is_linked()) {
- // If the return target has dangling jumps to it, then we have not
- // yet generated the return sequence. This can happen when (a)
- // control does not flow off the end of the body so we did not
- // compile an artificial return statement just above, and (b) there
- // are return statements in the body but (c) they are all shadowed.
- Result return_value;
- function_return_.Bind(&return_value);
- GenerateReturnSequence(&return_value);
- }
- }
- }
-
- // Adjust for function-level loop nesting.
- ASSERT_EQ(loop_nesting_, info->is_in_loop() ? 1 : 0);
- loop_nesting_ = 0;
-
- // Code generation state must be reset.
- ASSERT(state_ == NULL);
- ASSERT(!function_return_is_shadowed_);
- function_return_.Unuse();
- DeleteFrame();
-
- // Process any deferred code using the register allocator.
- if (!HasStackOverflow()) {
- info->isolate()->set_jump_target_compiling_deferred_code(true);
- ProcessDeferred();
- info->isolate()->set_jump_target_compiling_deferred_code(false);
- }
-
- // There is no need to delete the register allocator, it is a
- // stack-allocated local.
- allocator_ = NULL;
-}
-
-
-Operand CodeGenerator::SlotOperand(Slot* slot, Register tmp) {
- // Currently, this assertion will fail if we try to assign to
- // a constant variable that is constant because it is read-only
- // (such as the variable referring to a named function expression).
- // We need to implement assignments to read-only variables.
- // Ideally, we should do this during AST generation (by converting
- // such assignments into expression statements); however, in general
- // we may not be able to make the decision until past AST generation,
- // that is when the entire program is known.
- ASSERT(slot != NULL);
- int index = slot->index();
- switch (slot->type()) {
- case Slot::PARAMETER:
- return frame_->ParameterAt(index);
-
- case Slot::LOCAL:
- return frame_->LocalAt(index);
-
- case Slot::CONTEXT: {
- // Follow the context chain if necessary.
- ASSERT(!tmp.is(rsi)); // do not overwrite context register
- Register context = rsi;
- int chain_length = scope()->ContextChainLength(slot->var()->scope());
- for (int i = 0; i < chain_length; i++) {
- // Load the closure.
- // (All contexts, even 'with' contexts, have a closure,
- // and it is the same for all contexts inside a function.
- // There is no need to go to the function context first.)
- __ movq(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
- // Load the function context (which is the incoming, outer context).
- __ movq(tmp, FieldOperand(tmp, JSFunction::kContextOffset));
- context = tmp;
- }
- // We may have a 'with' context now. Get the function context.
- // (In fact this mov may never be the needed, since the scope analysis
- // may not permit a direct context access in this case and thus we are
- // always at a function context. However it is safe to dereference be-
- // cause the function context of a function context is itself. Before
- // deleting this mov we should try to create a counter-example first,
- // though...)
- __ movq(tmp, ContextOperand(context, Context::FCONTEXT_INDEX));
- return ContextOperand(tmp, index);
- }
-
- default:
- UNREACHABLE();
- return Operand(rsp, 0);
- }
-}
-
-
-Operand CodeGenerator::ContextSlotOperandCheckExtensions(Slot* slot,
- Result tmp,
- JumpTarget* slow) {
- ASSERT(slot->type() == Slot::CONTEXT);
- ASSERT(tmp.is_register());
- Register context = rsi;
-
- for (Scope* s = scope(); s != slot->var()->scope(); s = s->outer_scope()) {
- if (s->num_heap_slots() > 0) {
- if (s->calls_eval()) {
- // Check that extension is NULL.
- __ cmpq(ContextOperand(context, Context::EXTENSION_INDEX),
- Immediate(0));
- slow->Branch(not_equal, not_taken);
- }
- __ movq(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX));
- __ movq(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
- context = tmp.reg();
- }
- }
- // Check that last extension is NULL.
- __ cmpq(ContextOperand(context, Context::EXTENSION_INDEX), Immediate(0));
- slow->Branch(not_equal, not_taken);
- __ movq(tmp.reg(), ContextOperand(context, Context::FCONTEXT_INDEX));
- return ContextOperand(tmp.reg(), slot->index());
-}
-
-
-// Emit code to load the value of an expression to the top of the
-// frame. If the expression is boolean-valued it may be compiled (or
-// partially compiled) into control flow to the control destination.
-// If force_control is true, control flow is forced.
-void CodeGenerator::LoadCondition(Expression* expr,
- ControlDestination* dest,
- bool force_control) {
- ASSERT(!in_spilled_code());
- int original_height = frame_->height();
-
- { CodeGenState new_state(this, dest);
- Visit(expr);
-
- // If we hit a stack overflow, we may not have actually visited
- // the expression. In that case, we ensure that we have a
- // valid-looking frame state because we will continue to generate
- // code as we unwind the C++ stack.
- //
- // It's possible to have both a stack overflow and a valid frame
- // state (eg, a subexpression overflowed, visiting it returned
- // with a dummied frame state, and visiting this expression
- // returned with a normal-looking state).
- if (HasStackOverflow() &&
- !dest->is_used() &&
- frame_->height() == original_height) {
- dest->Goto(true);
- }
- }
-
- if (force_control && !dest->is_used()) {
- // Convert the TOS value into flow to the control destination.
- ToBoolean(dest);
- }
-
- ASSERT(!(force_control && !dest->is_used()));
- ASSERT(dest->is_used() || frame_->height() == original_height + 1);
-}
-
-
-void CodeGenerator::LoadAndSpill(Expression* expression) {
- ASSERT(in_spilled_code());
- set_in_spilled_code(false);
- Load(expression);
- frame_->SpillAll();
- set_in_spilled_code(true);
-}
-
-
-void CodeGenerator::Load(Expression* expr) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- ASSERT(!in_spilled_code());
- JumpTarget true_target;
- JumpTarget false_target;
- ControlDestination dest(&true_target, &false_target, true);
- LoadCondition(expr, &dest, false);
-
- if (dest.false_was_fall_through()) {
- // The false target was just bound.
- JumpTarget loaded;
- frame_->Push(FACTORY->false_value());
- // There may be dangling jumps to the true target.
- if (true_target.is_linked()) {
- loaded.Jump();
- true_target.Bind();
- frame_->Push(FACTORY->true_value());
- loaded.Bind();
- }
-
- } else if (dest.is_used()) {
- // There is true, and possibly false, control flow (with true as
- // the fall through).
- JumpTarget loaded;
- frame_->Push(FACTORY->true_value());
- if (false_target.is_linked()) {
- loaded.Jump();
- false_target.Bind();
- frame_->Push(FACTORY->false_value());
- loaded.Bind();
- }
-
- } else {
- // We have a valid value on top of the frame, but we still may
- // have dangling jumps to the true and false targets from nested
- // subexpressions (eg, the left subexpressions of the
- // short-circuited boolean operators).
- ASSERT(has_valid_frame());
- if (true_target.is_linked() || false_target.is_linked()) {
- JumpTarget loaded;
- loaded.Jump(); // Don't lose the current TOS.
- if (true_target.is_linked()) {
- true_target.Bind();
- frame_->Push(FACTORY->true_value());
- if (false_target.is_linked()) {
- loaded.Jump();
- }
- }
- if (false_target.is_linked()) {
- false_target.Bind();
- frame_->Push(FACTORY->false_value());
- }
- loaded.Bind();
- }
- }
-
- ASSERT(has_valid_frame());
- ASSERT(frame_->height() == original_height + 1);
-}
-
-
-void CodeGenerator::LoadGlobal() {
- if (in_spilled_code()) {
- frame_->EmitPush(GlobalObjectOperand());
- } else {
- Result temp = allocator_->Allocate();
- __ movq(temp.reg(), GlobalObjectOperand());
- frame_->Push(&temp);
- }
-}
-
-
-void CodeGenerator::LoadGlobalReceiver() {
- Result temp = allocator_->Allocate();
- Register reg = temp.reg();
- __ movq(reg, GlobalObjectOperand());
- __ movq(reg, FieldOperand(reg, GlobalObject::kGlobalReceiverOffset));
- frame_->Push(&temp);
-}
-
-
-void CodeGenerator::LoadTypeofExpression(Expression* expr) {
- // Special handling of identifiers as subexpressions of typeof.
- Variable* variable = expr->AsVariableProxy()->AsVariable();
- if (variable != NULL && !variable->is_this() && variable->is_global()) {
- // For a global variable we build the property reference
- // <global>.<variable> and perform a (regular non-contextual) property
- // load to make sure we do not get reference errors.
- Slot global(variable, Slot::CONTEXT, Context::GLOBAL_INDEX);
- Literal key(variable->name());
- Property property(&global, &key, RelocInfo::kNoPosition);
- Reference ref(this, &property);
- ref.GetValue();
- } else if (variable != NULL && variable->AsSlot() != NULL) {
- // For a variable that rewrites to a slot, we signal it is the immediate
- // subexpression of a typeof.
- LoadFromSlotCheckForArguments(variable->AsSlot(), INSIDE_TYPEOF);
- } else {
- // Anything else can be handled normally.
- Load(expr);
- }
-}
-
-
-ArgumentsAllocationMode CodeGenerator::ArgumentsMode() {
- if (scope()->arguments() == NULL) return NO_ARGUMENTS_ALLOCATION;
-
- // In strict mode there is no need for shadow arguments.
- ASSERT(scope()->arguments_shadow() != NULL || scope()->is_strict_mode());
- // We don't want to do lazy arguments allocation for functions that
- // have heap-allocated contexts, because it interfers with the
- // uninitialized const tracking in the context objects.
- return (scope()->num_heap_slots() > 0 || scope()->is_strict_mode())
- ? EAGER_ARGUMENTS_ALLOCATION
- : LAZY_ARGUMENTS_ALLOCATION;
-}
-
-
-Result CodeGenerator::StoreArgumentsObject(bool initial) {
- ArgumentsAllocationMode mode = ArgumentsMode();
- ASSERT(mode != NO_ARGUMENTS_ALLOCATION);
-
- Comment cmnt(masm_, "[ store arguments object");
- if (mode == LAZY_ARGUMENTS_ALLOCATION && initial) {
- // When using lazy arguments allocation, we store the arguments marker value
- // as a sentinel indicating that the arguments object hasn't been
- // allocated yet.
- frame_->Push(FACTORY->arguments_marker());
- } else {
- ArgumentsAccessStub stub(is_strict_mode()
- ? ArgumentsAccessStub::NEW_STRICT
- : ArgumentsAccessStub::NEW_NON_STRICT);
- frame_->PushFunction();
- frame_->PushReceiverSlotAddress();
- frame_->Push(Smi::FromInt(scope()->num_parameters()));
- Result result = frame_->CallStub(&stub, 3);
- frame_->Push(&result);
- }
-
- Variable* arguments = scope()->arguments();
- Variable* shadow = scope()->arguments_shadow();
- ASSERT(arguments != NULL && arguments->AsSlot() != NULL);
- ASSERT((shadow != NULL && shadow->AsSlot() != NULL) ||
- scope()->is_strict_mode());
-
- JumpTarget done;
- bool skip_arguments = false;
- if (mode == LAZY_ARGUMENTS_ALLOCATION && !initial) {
- // We have to skip storing into the arguments slot if it has
- // already been written to. This can happen if the a function
- // has a local variable named 'arguments'.
- LoadFromSlot(arguments->AsSlot(), NOT_INSIDE_TYPEOF);
- Result probe = frame_->Pop();
- if (probe.is_constant()) {
- // We have to skip updating the arguments object if it has
- // been assigned a proper value.
- skip_arguments = !probe.handle()->IsArgumentsMarker();
- } else {
- __ CompareRoot(probe.reg(), Heap::kArgumentsMarkerRootIndex);
- probe.Unuse();
- done.Branch(not_equal);
- }
- }
- if (!skip_arguments) {
- StoreToSlot(arguments->AsSlot(), NOT_CONST_INIT);
- if (mode == LAZY_ARGUMENTS_ALLOCATION) done.Bind();
- }
- if (shadow != NULL) {
- StoreToSlot(shadow->AsSlot(), NOT_CONST_INIT);
- }
- return frame_->Pop();
-}
-
-//------------------------------------------------------------------------------
-// CodeGenerator implementation of variables, lookups, and stores.
-
-Reference::Reference(CodeGenerator* cgen,
- Expression* expression,
- bool persist_after_get)
- : cgen_(cgen),
- expression_(expression),
- type_(ILLEGAL),
- persist_after_get_(persist_after_get) {
- cgen->LoadReference(this);
-}
-
-
-Reference::~Reference() {
- ASSERT(is_unloaded() || is_illegal());
-}
-
-
-void CodeGenerator::LoadReference(Reference* ref) {
- // References are loaded from both spilled and unspilled code. Set the
- // state to unspilled to allow that (and explicitly spill after
- // construction at the construction sites).
- bool was_in_spilled_code = in_spilled_code_;
- in_spilled_code_ = false;
-
- Comment cmnt(masm_, "[ LoadReference");
- Expression* e = ref->expression();
- Property* property = e->AsProperty();
- Variable* var = e->AsVariableProxy()->AsVariable();
-
- if (property != NULL) {
- // The expression is either a property or a variable proxy that rewrites
- // to a property.
- Load(property->obj());
- if (property->key()->IsPropertyName()) {
- ref->set_type(Reference::NAMED);
- } else {
- Load(property->key());
- ref->set_type(Reference::KEYED);
- }
- } else if (var != NULL) {
- // The expression is a variable proxy that does not rewrite to a
- // property. Global variables are treated as named property references.
- if (var->is_global()) {
- // If rax is free, the register allocator prefers it. Thus the code
- // generator will load the global object into rax, which is where
- // LoadIC wants it. Most uses of Reference call LoadIC directly
- // after the reference is created.
- frame_->Spill(rax);
- LoadGlobal();
- ref->set_type(Reference::NAMED);
- } else {
- ASSERT(var->AsSlot() != NULL);
- ref->set_type(Reference::SLOT);
- }
- } else {
- // Anything else is a runtime error.
- Load(e);
- frame_->CallRuntime(Runtime::kThrowReferenceError, 1);
- }
-
- in_spilled_code_ = was_in_spilled_code;
-}
-
-
-void CodeGenerator::UnloadReference(Reference* ref) {
- // Pop a reference from the stack while preserving TOS.
- Comment cmnt(masm_, "[ UnloadReference");
- frame_->Nip(ref->size());
- ref->set_unloaded();
-}
-
-
-// ECMA-262, section 9.2, page 30: ToBoolean(). Pop the top of stack and
-// convert it to a boolean in the condition code register or jump to
-// 'false_target'/'true_target' as appropriate.
-void CodeGenerator::ToBoolean(ControlDestination* dest) {
- Comment cmnt(masm_, "[ ToBoolean");
-
- // The value to convert should be popped from the frame.
- Result value = frame_->Pop();
- value.ToRegister();
-
- if (value.is_number()) {
- // Fast case if TypeInfo indicates only numbers.
- if (FLAG_debug_code) {
- __ AbortIfNotNumber(value.reg());
- }
- // Smi => false iff zero.
- __ Cmp(value.reg(), Smi::FromInt(0));
- if (value.is_smi()) {
- value.Unuse();
- dest->Split(not_zero);
- } else {
- dest->false_target()->Branch(equal);
- Condition is_smi = masm_->CheckSmi(value.reg());
- dest->true_target()->Branch(is_smi);
- __ xorpd(xmm0, xmm0);
- __ ucomisd(xmm0, FieldOperand(value.reg(), HeapNumber::kValueOffset));
- value.Unuse();
- dest->Split(not_zero);
- }
- } else {
- // Fast case checks.
- // 'false' => false.
- __ CompareRoot(value.reg(), Heap::kFalseValueRootIndex);
- dest->false_target()->Branch(equal);
-
- // 'true' => true.
- __ CompareRoot(value.reg(), Heap::kTrueValueRootIndex);
- dest->true_target()->Branch(equal);
-
- // 'undefined' => false.
- __ CompareRoot(value.reg(), Heap::kUndefinedValueRootIndex);
- dest->false_target()->Branch(equal);
-
- // Smi => false iff zero.
- __ Cmp(value.reg(), Smi::FromInt(0));
- dest->false_target()->Branch(equal);
- Condition is_smi = masm_->CheckSmi(value.reg());
- dest->true_target()->Branch(is_smi);
-
- // Call the stub for all other cases.
- frame_->Push(&value); // Undo the Pop() from above.
- ToBooleanStub stub;
- Result temp = frame_->CallStub(&stub, 1);
- // Convert the result to a condition code.
- __ testq(temp.reg(), temp.reg());
- temp.Unuse();
- dest->Split(not_equal);
- }
-}
-
-
-// Call the specialized stub for a binary operation.
-class DeferredInlineBinaryOperation: public DeferredCode {
- public:
- DeferredInlineBinaryOperation(Token::Value op,
- Register dst,
- Register left,
- Register right,
- OverwriteMode mode)
- : op_(op), dst_(dst), left_(left), right_(right), mode_(mode) {
- set_comment("[ DeferredInlineBinaryOperation");
- }
-
- virtual void Generate();
-
- private:
- Token::Value op_;
- Register dst_;
- Register left_;
- Register right_;
- OverwriteMode mode_;
-};
-
-
-void DeferredInlineBinaryOperation::Generate() {
- Label done;
- if ((op_ == Token::ADD)
- || (op_ == Token::SUB)
- || (op_ == Token::MUL)
- || (op_ == Token::DIV)) {
- Label call_runtime;
- Label left_smi, right_smi, load_right, do_op;
- __ JumpIfSmi(left_, &left_smi);
- __ CompareRoot(FieldOperand(left_, HeapObject::kMapOffset),
- Heap::kHeapNumberMapRootIndex);
- __ j(not_equal, &call_runtime);
- __ movsd(xmm0, FieldOperand(left_, HeapNumber::kValueOffset));
- if (mode_ == OVERWRITE_LEFT) {
- __ movq(dst_, left_);
- }
- __ jmp(&load_right);
-
- __ bind(&left_smi);
- __ SmiToInteger32(left_, left_);
- __ cvtlsi2sd(xmm0, left_);
- __ Integer32ToSmi(left_, left_);
- if (mode_ == OVERWRITE_LEFT) {
- Label alloc_failure;
- __ AllocateHeapNumber(dst_, no_reg, &call_runtime);
- }
-
- __ bind(&load_right);
- __ JumpIfSmi(right_, &right_smi);
- __ CompareRoot(FieldOperand(right_, HeapObject::kMapOffset),
- Heap::kHeapNumberMapRootIndex);
- __ j(not_equal, &call_runtime);
- __ movsd(xmm1, FieldOperand(right_, HeapNumber::kValueOffset));
- if (mode_ == OVERWRITE_RIGHT) {
- __ movq(dst_, right_);
- } else if (mode_ == NO_OVERWRITE) {
- Label alloc_failure;
- __ AllocateHeapNumber(dst_, no_reg, &call_runtime);
- }
- __ jmp(&do_op);
-
- __ bind(&right_smi);
- __ SmiToInteger32(right_, right_);
- __ cvtlsi2sd(xmm1, right_);
- __ Integer32ToSmi(right_, right_);
- if (mode_ == OVERWRITE_RIGHT || mode_ == NO_OVERWRITE) {
- Label alloc_failure;
- __ AllocateHeapNumber(dst_, no_reg, &call_runtime);
- }
-
- __ bind(&do_op);
- switch (op_) {
- case Token::ADD: __ addsd(xmm0, xmm1); break;
- case Token::SUB: __ subsd(xmm0, xmm1); break;
- case Token::MUL: __ mulsd(xmm0, xmm1); break;
- case Token::DIV: __ divsd(xmm0, xmm1); break;
- default: UNREACHABLE();
- }
- __ movsd(FieldOperand(dst_, HeapNumber::kValueOffset), xmm0);
- __ jmp(&done);
-
- __ bind(&call_runtime);
- }
- GenericBinaryOpStub stub(op_, mode_, NO_SMI_CODE_IN_STUB);
- stub.GenerateCall(masm_, left_, right_);
- if (!dst_.is(rax)) __ movq(dst_, rax);
- __ bind(&done);
-}
-
-
-static TypeInfo CalculateTypeInfo(TypeInfo operands_type,
- Token::Value op,
- const Result& right,
- const Result& left) {
- // Set TypeInfo of result according to the operation performed.
- // We rely on the fact that smis have a 32 bit payload on x64.
- STATIC_ASSERT(kSmiValueSize == 32);
- switch (op) {
- case Token::COMMA:
- return right.type_info();
- case Token::OR:
- case Token::AND:
- // Result type can be either of the two input types.
- return operands_type;
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND:
- // Result is always a smi.
- return TypeInfo::Smi();
- case Token::SAR:
- case Token::SHL:
- // Result is always a smi.
- return TypeInfo::Smi();
- case Token::SHR:
- // Result of x >>> y is always a smi if masked y >= 1, otherwise a number.
- return (right.is_constant() && right.handle()->IsSmi()
- && (Smi::cast(*right.handle())->value() & 0x1F) >= 1)
- ? TypeInfo::Smi()
- : TypeInfo::Number();
- case Token::ADD:
- if (operands_type.IsNumber()) {
- return TypeInfo::Number();
- } else if (left.type_info().IsString() || right.type_info().IsString()) {
- return TypeInfo::String();
- } else {
- return TypeInfo::Unknown();
- }
- case Token::SUB:
- case Token::MUL:
- case Token::DIV:
- case Token::MOD:
- // Result is always a number.
- return TypeInfo::Number();
- default:
- UNREACHABLE();
- }
- UNREACHABLE();
- return TypeInfo::Unknown();
-}
-
-
-void CodeGenerator::GenericBinaryOperation(BinaryOperation* expr,
- OverwriteMode overwrite_mode) {
- Comment cmnt(masm_, "[ BinaryOperation");
- Token::Value op = expr->op();
- Comment cmnt_token(masm_, Token::String(op));
-
- if (op == Token::COMMA) {
- // Simply discard left value.
- frame_->Nip(1);
- return;
- }
-
- Result right = frame_->Pop();
- Result left = frame_->Pop();
-
- if (op == Token::ADD) {
- const bool left_is_string = left.type_info().IsString();
- const bool right_is_string = right.type_info().IsString();
- // Make sure constant strings have string type info.
- ASSERT(!(left.is_constant() && left.handle()->IsString()) ||
- left_is_string);
- ASSERT(!(right.is_constant() && right.handle()->IsString()) ||
- right_is_string);
- if (left_is_string || right_is_string) {
- frame_->Push(&left);
- frame_->Push(&right);
- Result answer;
- if (left_is_string) {
- if (right_is_string) {
- StringAddStub stub(NO_STRING_CHECK_IN_STUB);
- answer = frame_->CallStub(&stub, 2);
- } else {
- answer =
- frame_->InvokeBuiltin(Builtins::STRING_ADD_LEFT, CALL_FUNCTION, 2);
- }
- } else if (right_is_string) {
- answer =
- frame_->InvokeBuiltin(Builtins::STRING_ADD_RIGHT, CALL_FUNCTION, 2);
- }
- answer.set_type_info(TypeInfo::String());
- frame_->Push(&answer);
- return;
- }
- // Neither operand is known to be a string.
- }
-
- bool left_is_smi_constant = left.is_constant() && left.handle()->IsSmi();
- bool left_is_non_smi_constant = left.is_constant() && !left.handle()->IsSmi();
- bool right_is_smi_constant = right.is_constant() && right.handle()->IsSmi();
- bool right_is_non_smi_constant =
- right.is_constant() && !right.handle()->IsSmi();
-
- if (left_is_smi_constant && right_is_smi_constant) {
- // Compute the constant result at compile time, and leave it on the frame.
- int left_int = Smi::cast(*left.handle())->value();
- int right_int = Smi::cast(*right.handle())->value();
- if (FoldConstantSmis(op, left_int, right_int)) return;
- }
-
- // Get number type of left and right sub-expressions.
- TypeInfo operands_type =
- TypeInfo::Combine(left.type_info(), right.type_info());
-
- TypeInfo result_type = CalculateTypeInfo(operands_type, op, right, left);
-
- Result answer;
- if (left_is_non_smi_constant || right_is_non_smi_constant) {
- // Go straight to the slow case, with no smi code.
- GenericBinaryOpStub stub(op,
- overwrite_mode,
- NO_SMI_CODE_IN_STUB,
- operands_type);
- answer = GenerateGenericBinaryOpStubCall(&stub, &left, &right);
- } else if (right_is_smi_constant) {
- answer = ConstantSmiBinaryOperation(expr, &left, right.handle(),
- false, overwrite_mode);
- } else if (left_is_smi_constant) {
- answer = ConstantSmiBinaryOperation(expr, &right, left.handle(),
- true, overwrite_mode);
- } else {
- // Set the flags based on the operation, type and loop nesting level.
- // Bit operations always assume they likely operate on smis. Still only
- // generate the inline Smi check code if this operation is part of a loop.
- // For all other operations only inline the Smi check code for likely smis
- // if the operation is part of a loop.
- if (loop_nesting() > 0 &&
- (Token::IsBitOp(op) ||
- operands_type.IsInteger32() ||
- expr->type()->IsLikelySmi())) {
- answer = LikelySmiBinaryOperation(expr, &left, &right, overwrite_mode);
- } else {
- GenericBinaryOpStub stub(op,
- overwrite_mode,
- NO_GENERIC_BINARY_FLAGS,
- operands_type);
- answer = GenerateGenericBinaryOpStubCall(&stub, &left, &right);
- }
- }
-
- answer.set_type_info(result_type);
- frame_->Push(&answer);
-}
-
-
-bool CodeGenerator::FoldConstantSmis(Token::Value op, int left, int right) {
- Object* answer_object = HEAP->undefined_value();
- switch (op) {
- case Token::ADD:
- // Use intptr_t to detect overflow of 32-bit int.
- if (Smi::IsValid(static_cast<intptr_t>(left) + right)) {
- answer_object = Smi::FromInt(left + right);
- }
- break;
- case Token::SUB:
- // Use intptr_t to detect overflow of 32-bit int.
- if (Smi::IsValid(static_cast<intptr_t>(left) - right)) {
- answer_object = Smi::FromInt(left - right);
- }
- break;
- case Token::MUL: {
- double answer = static_cast<double>(left) * right;
- if (answer >= Smi::kMinValue && answer <= Smi::kMaxValue) {
- // If the product is zero and the non-zero factor is negative,
- // the spec requires us to return floating point negative zero.
- if (answer != 0 || (left >= 0 && right >= 0)) {
- answer_object = Smi::FromInt(static_cast<int>(answer));
- }
- }
- }
- break;
- case Token::DIV:
- case Token::MOD:
- break;
- case Token::BIT_OR:
- answer_object = Smi::FromInt(left | right);
- break;
- case Token::BIT_AND:
- answer_object = Smi::FromInt(left & right);
- break;
- case Token::BIT_XOR:
- answer_object = Smi::FromInt(left ^ right);
- break;
-
- case Token::SHL: {
- int shift_amount = right & 0x1F;
- if (Smi::IsValid(left << shift_amount)) {
- answer_object = Smi::FromInt(left << shift_amount);
- }
- break;
- }
- case Token::SHR: {
- int shift_amount = right & 0x1F;
- unsigned int unsigned_left = left;
- unsigned_left >>= shift_amount;
- if (unsigned_left <= static_cast<unsigned int>(Smi::kMaxValue)) {
- answer_object = Smi::FromInt(unsigned_left);
- }
- break;
- }
- case Token::SAR: {
- int shift_amount = right & 0x1F;
- unsigned int unsigned_left = left;
- if (left < 0) {
- // Perform arithmetic shift of a negative number by
- // complementing number, logical shifting, complementing again.
- unsigned_left = ~unsigned_left;
- unsigned_left >>= shift_amount;
- unsigned_left = ~unsigned_left;
- } else {
- unsigned_left >>= shift_amount;
- }
- ASSERT(Smi::IsValid(static_cast<int32_t>(unsigned_left)));
- answer_object = Smi::FromInt(static_cast<int32_t>(unsigned_left));
- break;
- }
- default:
- UNREACHABLE();
- break;
- }
- if (answer_object->IsUndefined()) {
- return false;
- }
- frame_->Push(Handle<Object>(answer_object));
- return true;
-}
-
-
-void CodeGenerator::JumpIfBothSmiUsingTypeInfo(Result* left,
- Result* right,
- JumpTarget* both_smi) {
- TypeInfo left_info = left->type_info();
- TypeInfo right_info = right->type_info();
- if (left_info.IsDouble() || left_info.IsString() ||
- right_info.IsDouble() || right_info.IsString()) {
- // We know that left and right are not both smi. Don't do any tests.
- return;
- }
-
- if (left->reg().is(right->reg())) {
- if (!left_info.IsSmi()) {
- Condition is_smi = masm()->CheckSmi(left->reg());
- both_smi->Branch(is_smi);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left->reg());
- left->Unuse();
- right->Unuse();
- both_smi->Jump();
- }
- } else if (!left_info.IsSmi()) {
- if (!right_info.IsSmi()) {
- Condition is_smi = masm()->CheckBothSmi(left->reg(), right->reg());
- both_smi->Branch(is_smi);
- } else {
- Condition is_smi = masm()->CheckSmi(left->reg());
- both_smi->Branch(is_smi);
- }
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(left->reg());
- if (!right_info.IsSmi()) {
- Condition is_smi = masm()->CheckSmi(right->reg());
- both_smi->Branch(is_smi);
- } else {
- if (FLAG_debug_code) __ AbortIfNotSmi(right->reg());
- left->Unuse();
- right->Unuse();
- both_smi->Jump();
- }
- }
-}
-
-
-void CodeGenerator::JumpIfNotSmiUsingTypeInfo(Register reg,
- TypeInfo type,
- DeferredCode* deferred) {
- if (!type.IsSmi()) {
- __ JumpIfNotSmi(reg, deferred->entry_label());
- }
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(reg);
- }
-}
-
-
-void CodeGenerator::JumpIfNotBothSmiUsingTypeInfo(Register left,
- Register right,
- TypeInfo left_info,
- TypeInfo right_info,
- DeferredCode* deferred) {
- if (!left_info.IsSmi() && !right_info.IsSmi()) {
- __ JumpIfNotBothSmi(left, right, deferred->entry_label());
- } else if (!left_info.IsSmi()) {
- __ JumpIfNotSmi(left, deferred->entry_label());
- } else if (!right_info.IsSmi()) {
- __ JumpIfNotSmi(right, deferred->entry_label());
- }
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(left);
- __ AbortIfNotSmi(right);
- }
-}
-
-
-// Implements a binary operation using a deferred code object and some
-// inline code to operate on smis quickly.
-Result CodeGenerator::LikelySmiBinaryOperation(BinaryOperation* expr,
- Result* left,
- Result* right,
- OverwriteMode overwrite_mode) {
- // Copy the type info because left and right may be overwritten.
- TypeInfo left_type_info = left->type_info();
- TypeInfo right_type_info = right->type_info();
- Token::Value op = expr->op();
- Result answer;
- // Special handling of div and mod because they use fixed registers.
- if (op == Token::DIV || op == Token::MOD) {
- // We need rax as the quotient register, rdx as the remainder
- // register, neither left nor right in rax or rdx, and left copied
- // to rax.
- Result quotient;
- Result remainder;
- bool left_is_in_rax = false;
- // Step 1: get rax for quotient.
- if ((left->is_register() && left->reg().is(rax)) ||
- (right->is_register() && right->reg().is(rax))) {
- // One or both is in rax. Use a fresh non-rdx register for
- // them.
- Result fresh = allocator_->Allocate();
- ASSERT(fresh.is_valid());
- if (fresh.reg().is(rdx)) {
- remainder = fresh;
- fresh = allocator_->Allocate();
- ASSERT(fresh.is_valid());
- }
- if (left->is_register() && left->reg().is(rax)) {
- quotient = *left;
- *left = fresh;
- left_is_in_rax = true;
- }
- if (right->is_register() && right->reg().is(rax)) {
- quotient = *right;
- *right = fresh;
- }
- __ movq(fresh.reg(), rax);
- } else {
- // Neither left nor right is in rax.
- quotient = allocator_->Allocate(rax);
- }
- ASSERT(quotient.is_register() && quotient.reg().is(rax));
- ASSERT(!(left->is_register() && left->reg().is(rax)));
- ASSERT(!(right->is_register() && right->reg().is(rax)));
-
- // Step 2: get rdx for remainder if necessary.
- if (!remainder.is_valid()) {
- if ((left->is_register() && left->reg().is(rdx)) ||
- (right->is_register() && right->reg().is(rdx))) {
- Result fresh = allocator_->Allocate();
- ASSERT(fresh.is_valid());
- if (left->is_register() && left->reg().is(rdx)) {
- remainder = *left;
- *left = fresh;
- }
- if (right->is_register() && right->reg().is(rdx)) {
- remainder = *right;
- *right = fresh;
- }
- __ movq(fresh.reg(), rdx);
- } else {
- // Neither left nor right is in rdx.
- remainder = allocator_->Allocate(rdx);
- }
- }
- ASSERT(remainder.is_register() && remainder.reg().is(rdx));
- ASSERT(!(left->is_register() && left->reg().is(rdx)));
- ASSERT(!(right->is_register() && right->reg().is(rdx)));
-
- left->ToRegister();
- right->ToRegister();
- frame_->Spill(rax);
- frame_->Spill(rdx);
-
- // Check that left and right are smi tagged.
- DeferredInlineBinaryOperation* deferred =
- new DeferredInlineBinaryOperation(op,
- (op == Token::DIV) ? rax : rdx,
- left->reg(),
- right->reg(),
- overwrite_mode);
- JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(),
- left_type_info, right_type_info, deferred);
-
- if (op == Token::DIV) {
- __ SmiDiv(rax, left->reg(), right->reg(), deferred->entry_label());
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- answer = quotient;
- } else {
- ASSERT(op == Token::MOD);
- __ SmiMod(rdx, left->reg(), right->reg(), deferred->entry_label());
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- answer = remainder;
- }
- ASSERT(answer.is_valid());
- return answer;
- }
-
- // Special handling of shift operations because they use fixed
- // registers.
- if (op == Token::SHL || op == Token::SHR || op == Token::SAR) {
- // Move left out of rcx if necessary.
- if (left->is_register() && left->reg().is(rcx)) {
- *left = allocator_->Allocate();
- ASSERT(left->is_valid());
- __ movq(left->reg(), rcx);
- }
- right->ToRegister(rcx);
- left->ToRegister();
- ASSERT(left->is_register() && !left->reg().is(rcx));
- ASSERT(right->is_register() && right->reg().is(rcx));
-
- // We will modify right, it must be spilled.
- frame_->Spill(rcx);
-
- // Use a fresh answer register to avoid spilling the left operand.
- answer = allocator_->Allocate();
- ASSERT(answer.is_valid());
- // Check that both operands are smis using the answer register as a
- // temporary.
- DeferredInlineBinaryOperation* deferred =
- new DeferredInlineBinaryOperation(op,
- answer.reg(),
- left->reg(),
- rcx,
- overwrite_mode);
-
- Label do_op;
- // Left operand must be unchanged in left->reg() for deferred code.
- // Left operand is in answer.reg(), possibly converted to int32, for
- // inline code.
- __ movq(answer.reg(), left->reg());
- if (right_type_info.IsSmi()) {
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(right->reg());
- }
- // If left is not known to be a smi, check if it is.
- // If left is not known to be a number, and it isn't a smi, check if
- // it is a HeapNumber.
- if (!left_type_info.IsSmi()) {
- __ JumpIfSmi(answer.reg(), &do_op);
- if (!left_type_info.IsNumber()) {
- // Branch if not a heapnumber.
- __ Cmp(FieldOperand(answer.reg(), HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- deferred->Branch(not_equal);
- }
- // Load integer value into answer register using truncation.
- __ cvttsd2si(answer.reg(),
- FieldOperand(answer.reg(), HeapNumber::kValueOffset));
- // Branch if we might have overflowed.
- // (False negative for Smi::kMinValue)
- __ cmpl(answer.reg(), Immediate(0x80000000));
- deferred->Branch(equal);
- // TODO(lrn): Inline shifts on int32 here instead of first smi-tagging.
- __ Integer32ToSmi(answer.reg(), answer.reg());
- } else {
- // Fast case - both are actually smis.
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(left->reg());
- }
- }
- } else {
- JumpIfNotBothSmiUsingTypeInfo(left->reg(), rcx,
- left_type_info, right_type_info, deferred);
- }
- __ bind(&do_op);
-
- // Perform the operation.
- switch (op) {
- case Token::SAR:
- __ SmiShiftArithmeticRight(answer.reg(), answer.reg(), rcx);
- break;
- case Token::SHR: {
- __ SmiShiftLogicalRight(answer.reg(),
- answer.reg(),
- rcx,
- deferred->entry_label());
- break;
- }
- case Token::SHL: {
- __ SmiShiftLeft(answer.reg(),
- answer.reg(),
- rcx);
- break;
- }
- default:
- UNREACHABLE();
- }
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- ASSERT(answer.is_valid());
- return answer;
- }
-
- // Handle the other binary operations.
- left->ToRegister();
- right->ToRegister();
- // A newly allocated register answer is used to hold the answer. The
- // registers containing left and right are not modified so they don't
- // need to be spilled in the fast case.
- answer = allocator_->Allocate();
- ASSERT(answer.is_valid());
-
- // Perform the smi tag check.
- DeferredInlineBinaryOperation* deferred =
- new DeferredInlineBinaryOperation(op,
- answer.reg(),
- left->reg(),
- right->reg(),
- overwrite_mode);
- JumpIfNotBothSmiUsingTypeInfo(left->reg(), right->reg(),
- left_type_info, right_type_info, deferred);
-
- switch (op) {
- case Token::ADD:
- __ SmiAdd(answer.reg(),
- left->reg(),
- right->reg(),
- deferred->entry_label());
- break;
-
- case Token::SUB:
- __ SmiSub(answer.reg(),
- left->reg(),
- right->reg(),
- deferred->entry_label());
- break;
-
- case Token::MUL: {
- __ SmiMul(answer.reg(),
- left->reg(),
- right->reg(),
- deferred->entry_label());
- break;
- }
-
- case Token::BIT_OR:
- __ SmiOr(answer.reg(), left->reg(), right->reg());
- break;
-
- case Token::BIT_AND:
- __ SmiAnd(answer.reg(), left->reg(), right->reg());
- break;
-
- case Token::BIT_XOR:
- __ SmiXor(answer.reg(), left->reg(), right->reg());
- break;
-
- default:
- UNREACHABLE();
- break;
- }
- deferred->BindExit();
- left->Unuse();
- right->Unuse();
- ASSERT(answer.is_valid());
- return answer;
-}
-
-
-// Call the appropriate binary operation stub to compute src op value
-// and leave the result in dst.
-class DeferredInlineSmiOperation: public DeferredCode {
- public:
- DeferredInlineSmiOperation(Token::Value op,
- Register dst,
- Register src,
- Smi* value,
- OverwriteMode overwrite_mode)
- : op_(op),
- dst_(dst),
- src_(src),
- value_(value),
- overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiOperation");
- }
-
- virtual void Generate();
-
- private:
- Token::Value op_;
- Register dst_;
- Register src_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiOperation::Generate() {
- // For mod we don't generate all the Smi code inline.
- GenericBinaryOpStub stub(
- op_,
- overwrite_mode_,
- (op_ == Token::MOD) ? NO_GENERIC_BINARY_FLAGS : NO_SMI_CODE_IN_STUB);
- stub.GenerateCall(masm_, src_, value_);
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-// Call the appropriate binary operation stub to compute value op src
-// and leave the result in dst.
-class DeferredInlineSmiOperationReversed: public DeferredCode {
- public:
- DeferredInlineSmiOperationReversed(Token::Value op,
- Register dst,
- Smi* value,
- Register src,
- OverwriteMode overwrite_mode)
- : op_(op),
- dst_(dst),
- value_(value),
- src_(src),
- overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiOperationReversed");
- }
-
- virtual void Generate();
-
- private:
- Token::Value op_;
- Register dst_;
- Smi* value_;
- Register src_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiOperationReversed::Generate() {
- GenericBinaryOpStub stub(
- op_,
- overwrite_mode_,
- NO_SMI_CODE_IN_STUB);
- stub.GenerateCall(masm_, value_, src_);
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-class DeferredInlineSmiAdd: public DeferredCode {
- public:
- DeferredInlineSmiAdd(Register dst,
- Smi* value,
- OverwriteMode overwrite_mode)
- : dst_(dst), value_(value), overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiAdd");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiAdd::Generate() {
- GenericBinaryOpStub igostub(Token::ADD, overwrite_mode_, NO_SMI_CODE_IN_STUB);
- igostub.GenerateCall(masm_, dst_, value_);
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-// The result of value + src is in dst. It either overflowed or was not
-// smi tagged. Undo the speculative addition and call the appropriate
-// specialized stub for add. The result is left in dst.
-class DeferredInlineSmiAddReversed: public DeferredCode {
- public:
- DeferredInlineSmiAddReversed(Register dst,
- Smi* value,
- OverwriteMode overwrite_mode)
- : dst_(dst), value_(value), overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiAddReversed");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiAddReversed::Generate() {
- GenericBinaryOpStub igostub(Token::ADD, overwrite_mode_, NO_SMI_CODE_IN_STUB);
- igostub.GenerateCall(masm_, value_, dst_);
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-class DeferredInlineSmiSub: public DeferredCode {
- public:
- DeferredInlineSmiSub(Register dst,
- Smi* value,
- OverwriteMode overwrite_mode)
- : dst_(dst), value_(value), overwrite_mode_(overwrite_mode) {
- set_comment("[ DeferredInlineSmiSub");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- Smi* value_;
- OverwriteMode overwrite_mode_;
-};
-
-
-void DeferredInlineSmiSub::Generate() {
- GenericBinaryOpStub igostub(Token::SUB, overwrite_mode_, NO_SMI_CODE_IN_STUB);
- igostub.GenerateCall(masm_, dst_, value_);
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-Result CodeGenerator::ConstantSmiBinaryOperation(BinaryOperation* expr,
- Result* operand,
- Handle<Object> value,
- bool reversed,
- OverwriteMode overwrite_mode) {
- // Generate inline code for a binary operation when one of the
- // operands is a constant smi. Consumes the argument "operand".
- if (IsUnsafeSmi(value)) {
- Result unsafe_operand(value);
- if (reversed) {
- return LikelySmiBinaryOperation(expr, &unsafe_operand, operand,
- overwrite_mode);
- } else {
- return LikelySmiBinaryOperation(expr, operand, &unsafe_operand,
- overwrite_mode);
- }
- }
-
- // Get the literal value.
- Smi* smi_value = Smi::cast(*value);
- int int_value = smi_value->value();
-
- Token::Value op = expr->op();
- Result answer;
- switch (op) {
- case Token::ADD: {
- operand->ToRegister();
- frame_->Spill(operand->reg());
- DeferredCode* deferred = NULL;
- if (reversed) {
- deferred = new DeferredInlineSmiAddReversed(operand->reg(),
- smi_value,
- overwrite_mode);
- } else {
- deferred = new DeferredInlineSmiAdd(operand->reg(),
- smi_value,
- overwrite_mode);
- }
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- __ SmiAddConstant(operand->reg(),
- operand->reg(),
- smi_value,
- deferred->entry_label());
- deferred->BindExit();
- answer = *operand;
- break;
- }
-
- case Token::SUB: {
- if (reversed) {
- Result constant_operand(value);
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- operand->ToRegister();
- frame_->Spill(operand->reg());
- answer = *operand;
- DeferredCode* deferred = new DeferredInlineSmiSub(operand->reg(),
- smi_value,
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- // A smi currently fits in a 32-bit Immediate.
- __ SmiSubConstant(operand->reg(),
- operand->reg(),
- smi_value,
- deferred->entry_label());
- deferred->BindExit();
- operand->Unuse();
- }
- break;
- }
-
- case Token::SAR:
- if (reversed) {
- Result constant_operand(value);
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- // Only the least significant 5 bits of the shift value are used.
- // In the slow case, this masking is done inside the runtime call.
- int shift_value = int_value & 0x1f;
- operand->ToRegister();
- frame_->Spill(operand->reg());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- smi_value,
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- __ SmiShiftArithmeticRightConstant(operand->reg(),
- operand->reg(),
- shift_value);
- deferred->BindExit();
- answer = *operand;
- }
- break;
-
- case Token::SHR:
- if (reversed) {
- Result constant_operand(value);
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- // Only the least significant 5 bits of the shift value are used.
- // In the slow case, this masking is done inside the runtime call.
- int shift_value = int_value & 0x1f;
- operand->ToRegister();
- answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- answer.reg(),
- operand->reg(),
- smi_value,
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- __ SmiShiftLogicalRightConstant(answer.reg(),
- operand->reg(),
- shift_value,
- deferred->entry_label());
- deferred->BindExit();
- operand->Unuse();
- }
- break;
-
- case Token::SHL:
- if (reversed) {
- operand->ToRegister();
-
- // We need rcx to be available to hold operand, and to be spilled.
- // SmiShiftLeft implicitly modifies rcx.
- if (operand->reg().is(rcx)) {
- frame_->Spill(operand->reg());
- answer = allocator()->Allocate();
- } else {
- Result rcx_reg = allocator()->Allocate(rcx);
- // answer must not be rcx.
- answer = allocator()->Allocate();
- // rcx_reg goes out of scope.
- }
-
- DeferredInlineSmiOperationReversed* deferred =
- new DeferredInlineSmiOperationReversed(op,
- answer.reg(),
- smi_value,
- operand->reg(),
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
-
- __ Move(answer.reg(), smi_value);
- __ SmiShiftLeft(answer.reg(), answer.reg(), operand->reg());
- operand->Unuse();
-
- deferred->BindExit();
- } else {
- // Only the least significant 5 bits of the shift value are used.
- // In the slow case, this masking is done inside the runtime call.
- int shift_value = int_value & 0x1f;
- operand->ToRegister();
- if (shift_value == 0) {
- // Spill operand so it can be overwritten in the slow case.
- frame_->Spill(operand->reg());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- smi_value,
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- deferred->BindExit();
- answer = *operand;
- } else {
- // Use a fresh temporary for nonzero shift values.
- answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- DeferredInlineSmiOperation* deferred =
- new DeferredInlineSmiOperation(op,
- answer.reg(),
- operand->reg(),
- smi_value,
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- __ SmiShiftLeftConstant(answer.reg(),
- operand->reg(),
- shift_value);
- deferred->BindExit();
- operand->Unuse();
- }
- }
- break;
-
- case Token::BIT_OR:
- case Token::BIT_XOR:
- case Token::BIT_AND: {
- operand->ToRegister();
- frame_->Spill(operand->reg());
- if (reversed) {
- // Bit operations with a constant smi are commutative.
- // We can swap left and right operands with no problem.
- // Swap left and right overwrite modes. 0->0, 1->2, 2->1.
- overwrite_mode = static_cast<OverwriteMode>((2 * overwrite_mode) % 3);
- }
- DeferredCode* deferred = new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- smi_value,
- overwrite_mode);
- JumpIfNotSmiUsingTypeInfo(operand->reg(), operand->type_info(),
- deferred);
- if (op == Token::BIT_AND) {
- __ SmiAndConstant(operand->reg(), operand->reg(), smi_value);
- } else if (op == Token::BIT_XOR) {
- if (int_value != 0) {
- __ SmiXorConstant(operand->reg(), operand->reg(), smi_value);
- }
- } else {
- ASSERT(op == Token::BIT_OR);
- if (int_value != 0) {
- __ SmiOrConstant(operand->reg(), operand->reg(), smi_value);
- }
- }
- deferred->BindExit();
- answer = *operand;
- break;
- }
-
- // Generate inline code for mod of powers of 2 and negative powers of 2.
- case Token::MOD:
- if (!reversed &&
- int_value != 0 &&
- (IsPowerOf2(int_value) || IsPowerOf2(-int_value))) {
- operand->ToRegister();
- frame_->Spill(operand->reg());
- DeferredCode* deferred =
- new DeferredInlineSmiOperation(op,
- operand->reg(),
- operand->reg(),
- smi_value,
- overwrite_mode);
- __ JumpUnlessNonNegativeSmi(operand->reg(), deferred->entry_label());
- if (int_value < 0) int_value = -int_value;
- if (int_value == 1) {
- __ Move(operand->reg(), Smi::FromInt(0));
- } else {
- __ SmiAndConstant(operand->reg(),
- operand->reg(),
- Smi::FromInt(int_value - 1));
- }
- deferred->BindExit();
- answer = *operand;
- break; // This break only applies if we generated code for MOD.
- }
- // Fall through if we did not find a power of 2 on the right hand side!
- // The next case must be the default.
-
- default: {
- Result constant_operand(value);
- if (reversed) {
- answer = LikelySmiBinaryOperation(expr, &constant_operand, operand,
- overwrite_mode);
- } else {
- answer = LikelySmiBinaryOperation(expr, operand, &constant_operand,
- overwrite_mode);
- }
- break;
- }
- }
- ASSERT(answer.is_valid());
- return answer;
-}
-
-
-static bool CouldBeNaN(const Result& result) {
- if (result.type_info().IsSmi()) return false;
- if (result.type_info().IsInteger32()) return false;
- if (!result.is_constant()) return true;
- if (!result.handle()->IsHeapNumber()) return false;
- return isnan(HeapNumber::cast(*result.handle())->value());
-}
-
-
-// Convert from signed to unsigned comparison to match the way EFLAGS are set
-// by FPU and XMM compare instructions.
-static Condition DoubleCondition(Condition cc) {
- switch (cc) {
- case less: return below;
- case equal: return equal;
- case less_equal: return below_equal;
- case greater: return above;
- case greater_equal: return above_equal;
- default: UNREACHABLE();
- }
- UNREACHABLE();
- return equal;
-}
-
-
-static CompareFlags ComputeCompareFlags(NaNInformation nan_info,
- bool inline_number_compare) {
- CompareFlags flags = NO_SMI_COMPARE_IN_STUB;
- if (nan_info == kCantBothBeNaN) {
- flags = static_cast<CompareFlags>(flags | CANT_BOTH_BE_NAN);
- }
- if (inline_number_compare) {
- flags = static_cast<CompareFlags>(flags | NO_NUMBER_COMPARE_IN_STUB);
- }
- return flags;
-}
-
-
-void CodeGenerator::Comparison(AstNode* node,
- Condition cc,
- bool strict,
- ControlDestination* dest) {
- // Strict only makes sense for equality comparisons.
- ASSERT(!strict || cc == equal);
-
- Result left_side;
- Result right_side;
- // Implement '>' and '<=' by reversal to obtain ECMA-262 conversion order.
- if (cc == greater || cc == less_equal) {
- cc = ReverseCondition(cc);
- left_side = frame_->Pop();
- right_side = frame_->Pop();
- } else {
- right_side = frame_->Pop();
- left_side = frame_->Pop();
- }
- ASSERT(cc == less || cc == equal || cc == greater_equal);
-
- // If either side is a constant smi, optimize the comparison.
- bool left_side_constant_smi = false;
- bool left_side_constant_null = false;
- bool left_side_constant_1_char_string = false;
- if (left_side.is_constant()) {
- left_side_constant_smi = left_side.handle()->IsSmi();
- left_side_constant_null = left_side.handle()->IsNull();
- left_side_constant_1_char_string =
- (left_side.handle()->IsString() &&
- String::cast(*left_side.handle())->length() == 1 &&
- String::cast(*left_side.handle())->IsAsciiRepresentation());
- }
- bool right_side_constant_smi = false;
- bool right_side_constant_null = false;
- bool right_side_constant_1_char_string = false;
- if (right_side.is_constant()) {
- right_side_constant_smi = right_side.handle()->IsSmi();
- right_side_constant_null = right_side.handle()->IsNull();
- right_side_constant_1_char_string =
- (right_side.handle()->IsString() &&
- String::cast(*right_side.handle())->length() == 1 &&
- String::cast(*right_side.handle())->IsAsciiRepresentation());
- }
-
- if (left_side_constant_smi || right_side_constant_smi) {
- bool is_loop_condition = (node->AsExpression() != NULL) &&
- node->AsExpression()->is_loop_condition();
- ConstantSmiComparison(cc, strict, dest, &left_side, &right_side,
- left_side_constant_smi, right_side_constant_smi,
- is_loop_condition);
- } else if (left_side_constant_1_char_string ||
- right_side_constant_1_char_string) {
- if (left_side_constant_1_char_string && right_side_constant_1_char_string) {
- // Trivial case, comparing two constants.
- int left_value = String::cast(*left_side.handle())->Get(0);
- int right_value = String::cast(*right_side.handle())->Get(0);
- switch (cc) {
- case less:
- dest->Goto(left_value < right_value);
- break;
- case equal:
- dest->Goto(left_value == right_value);
- break;
- case greater_equal:
- dest->Goto(left_value >= right_value);
- break;
- default:
- UNREACHABLE();
- }
- } else {
- // Only one side is a constant 1 character string.
- // If left side is a constant 1-character string, reverse the operands.
- // Since one side is a constant string, conversion order does not matter.
- if (left_side_constant_1_char_string) {
- Result temp = left_side;
- left_side = right_side;
- right_side = temp;
- cc = ReverseCondition(cc);
- // This may reintroduce greater or less_equal as the value of cc.
- // CompareStub and the inline code both support all values of cc.
- }
- // Implement comparison against a constant string, inlining the case
- // where both sides are strings.
- left_side.ToRegister();
-
- // Here we split control flow to the stub call and inlined cases
- // before finally splitting it to the control destination. We use
- // a jump target and branching to duplicate the virtual frame at
- // the first split. We manually handle the off-frame references
- // by reconstituting them on the non-fall-through path.
- JumpTarget is_not_string, is_string;
- Register left_reg = left_side.reg();
- Handle<Object> right_val = right_side.handle();
- ASSERT(StringShape(String::cast(*right_val)).IsSymbol());
- Condition is_smi = masm()->CheckSmi(left_reg);
- is_not_string.Branch(is_smi, &left_side);
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- __ movq(temp.reg(),
- FieldOperand(left_reg, HeapObject::kMapOffset));
- __ movzxbl(temp.reg(),
- FieldOperand(temp.reg(), Map::kInstanceTypeOffset));
- // If we are testing for equality then make use of the symbol shortcut.
- // Check if the left hand side has the same type as the right hand
- // side (which is always a symbol).
- if (cc == equal) {
- Label not_a_symbol;
- STATIC_ASSERT(kSymbolTag != 0);
- // Ensure that no non-strings have the symbol bit set.
- STATIC_ASSERT(LAST_TYPE < kNotStringTag + kIsSymbolMask);
- __ testb(temp.reg(), Immediate(kIsSymbolMask)); // Test the symbol bit.
- __ j(zero, ¬_a_symbol);
- // They are symbols, so do identity compare.
- __ Cmp(left_reg, right_side.handle());
- dest->true_target()->Branch(equal);
- dest->false_target()->Branch(not_equal);
- __ bind(¬_a_symbol);
- }
- // Call the compare stub if the left side is not a flat ascii string.
- __ andb(temp.reg(),
- Immediate(kIsNotStringMask |
- kStringRepresentationMask |
- kStringEncodingMask));
- __ cmpb(temp.reg(),
- Immediate(kStringTag | kSeqStringTag | kAsciiStringTag));
- temp.Unuse();
- is_string.Branch(equal, &left_side);
-
- // Setup and call the compare stub.
- is_not_string.Bind(&left_side);
- CompareFlags flags =
- static_cast<CompareFlags>(CANT_BOTH_BE_NAN | NO_SMI_CODE_IN_STUB);
- CompareStub stub(cc, strict, flags);
- Result result = frame_->CallStub(&stub, &left_side, &right_side);
- result.ToRegister();
- __ testq(result.reg(), result.reg());
- result.Unuse();
- dest->true_target()->Branch(cc);
- dest->false_target()->Jump();
-
- is_string.Bind(&left_side);
- // left_side is a sequential ASCII string.
- ASSERT(left_side.reg().is(left_reg));
- right_side = Result(right_val);
- Result temp2 = allocator_->Allocate();
- ASSERT(temp2.is_valid());
- // Test string equality and comparison.
- if (cc == equal) {
- Label comparison_done;
- __ SmiCompare(FieldOperand(left_side.reg(), String::kLengthOffset),
- Smi::FromInt(1));
- __ j(not_equal, &comparison_done);
- uint8_t char_value =
- static_cast<uint8_t>(String::cast(*right_val)->Get(0));
- __ cmpb(FieldOperand(left_side.reg(), SeqAsciiString::kHeaderSize),
- Immediate(char_value));
- __ bind(&comparison_done);
- } else {
- __ movq(temp2.reg(),
- FieldOperand(left_side.reg(), String::kLengthOffset));
- __ SmiSubConstant(temp2.reg(), temp2.reg(), Smi::FromInt(1));
- Label comparison;
- // If the length is 0 then the subtraction gave -1 which compares less
- // than any character.
- __ j(negative, &comparison);
- // Otherwise load the first character.
- __ movzxbl(temp2.reg(),
- FieldOperand(left_side.reg(), SeqAsciiString::kHeaderSize));
- __ bind(&comparison);
- // Compare the first character of the string with the
- // constant 1-character string.
- uint8_t char_value =
- static_cast<uint8_t>(String::cast(*right_side.handle())->Get(0));
- __ cmpb(temp2.reg(), Immediate(char_value));
- Label characters_were_different;
- __ j(not_equal, &characters_were_different);
- // If the first character is the same then the long string sorts after
- // the short one.
- __ SmiCompare(FieldOperand(left_side.reg(), String::kLengthOffset),
- Smi::FromInt(1));
- __ bind(&characters_were_different);
- }
- temp2.Unuse();
- left_side.Unuse();
- right_side.Unuse();
- dest->Split(cc);
- }
- } else {
- // Neither side is a constant Smi, constant 1-char string, or constant null.
- // If either side is a non-smi constant, or known to be a heap number,
- // skip the smi check.
- bool known_non_smi =
- (left_side.is_constant() && !left_side.handle()->IsSmi()) ||
- (right_side.is_constant() && !right_side.handle()->IsSmi()) ||
- left_side.type_info().IsDouble() ||
- right_side.type_info().IsDouble();
-
- NaNInformation nan_info =
- (CouldBeNaN(left_side) && CouldBeNaN(right_side)) ?
- kBothCouldBeNaN :
- kCantBothBeNaN;
-
- // Inline number comparison handling any combination of smi's and heap
- // numbers if:
- // code is in a loop
- // the compare operation is different from equal
- // compare is not a for-loop comparison
- // The reason for excluding equal is that it will most likely be done
- // with smi's (not heap numbers) and the code to comparing smi's is inlined
- // separately. The same reason applies for for-loop comparison which will
- // also most likely be smi comparisons.
- bool is_loop_condition = (node->AsExpression() != NULL)
- && node->AsExpression()->is_loop_condition();
- bool inline_number_compare =
- loop_nesting() > 0 && cc != equal && !is_loop_condition;
-
- // Left and right needed in registers for the following code.
- left_side.ToRegister();
- right_side.ToRegister();
-
- if (known_non_smi) {
- // Inlined equality check:
- // If at least one of the objects is not NaN, then if the objects
- // are identical, they are equal.
- if (nan_info == kCantBothBeNaN && cc == equal) {
- __ cmpq(left_side.reg(), right_side.reg());
- dest->true_target()->Branch(equal);
- }
-
- // Inlined number comparison:
- if (inline_number_compare) {
- GenerateInlineNumberComparison(&left_side, &right_side, cc, dest);
- }
-
- // End of in-line compare, call out to the compare stub. Don't include
- // number comparison in the stub if it was inlined.
- CompareFlags flags = ComputeCompareFlags(nan_info, inline_number_compare);
- CompareStub stub(cc, strict, flags);
- Result answer = frame_->CallStub(&stub, &left_side, &right_side);
- __ testq(answer.reg(), answer.reg()); // Sets both zero and sign flag.
- answer.Unuse();
- dest->Split(cc);
- } else {
- // Here we split control flow to the stub call and inlined cases
- // before finally splitting it to the control destination. We use
- // a jump target and branching to duplicate the virtual frame at
- // the first split. We manually handle the off-frame references
- // by reconstituting them on the non-fall-through path.
- JumpTarget is_smi;
- Register left_reg = left_side.reg();
- Register right_reg = right_side.reg();
-
- // In-line check for comparing two smis.
- JumpIfBothSmiUsingTypeInfo(&left_side, &right_side, &is_smi);
-
- if (has_valid_frame()) {
- // Inline the equality check if both operands can't be a NaN. If both
- // objects are the same they are equal.
- if (nan_info == kCantBothBeNaN && cc == equal) {
- __ cmpq(left_side.reg(), right_side.reg());
- dest->true_target()->Branch(equal);
- }
-
- // Inlined number comparison:
- if (inline_number_compare) {
- GenerateInlineNumberComparison(&left_side, &right_side, cc, dest);
- }
-
- // End of in-line compare, call out to the compare stub. Don't include
- // number comparison in the stub if it was inlined.
- CompareFlags flags =
- ComputeCompareFlags(nan_info, inline_number_compare);
- CompareStub stub(cc, strict, flags);
- Result answer = frame_->CallStub(&stub, &left_side, &right_side);
- __ testq(answer.reg(), answer.reg()); // Sets both zero and sign flags.
- answer.Unuse();
- if (is_smi.is_linked()) {
- dest->true_target()->Branch(cc);
- dest->false_target()->Jump();
- } else {
- dest->Split(cc);
- }
- }
-
- if (is_smi.is_linked()) {
- is_smi.Bind();
- left_side = Result(left_reg);
- right_side = Result(right_reg);
- __ SmiCompare(left_side.reg(), right_side.reg());
- right_side.Unuse();
- left_side.Unuse();
- dest->Split(cc);
- }
- }
- }
-}
-
-
-void CodeGenerator::ConstantSmiComparison(Condition cc,
- bool strict,
- ControlDestination* dest,
- Result* left_side,
- Result* right_side,
- bool left_side_constant_smi,
- bool right_side_constant_smi,
- bool is_loop_condition) {
- if (left_side_constant_smi && right_side_constant_smi) {
- // Trivial case, comparing two constants.
- int left_value = Smi::cast(*left_side->handle())->value();
- int right_value = Smi::cast(*right_side->handle())->value();
- switch (cc) {
- case less:
- dest->Goto(left_value < right_value);
- break;
- case equal:
- dest->Goto(left_value == right_value);
- break;
- case greater_equal:
- dest->Goto(left_value >= right_value);
- break;
- default:
- UNREACHABLE();
- }
- } else {
- // Only one side is a constant Smi.
- // If left side is a constant Smi, reverse the operands.
- // Since one side is a constant Smi, conversion order does not matter.
- if (left_side_constant_smi) {
- Result* temp = left_side;
- left_side = right_side;
- right_side = temp;
- cc = ReverseCondition(cc);
- // This may re-introduce greater or less_equal as the value of cc.
- // CompareStub and the inline code both support all values of cc.
- }
- // Implement comparison against a constant Smi, inlining the case
- // where both sides are smis.
- left_side->ToRegister();
- Register left_reg = left_side->reg();
- Smi* constant_smi = Smi::cast(*right_side->handle());
-
- if (left_side->is_smi()) {
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(left_reg);
- }
- // Test smi equality and comparison by signed int comparison.
- __ SmiCompare(left_reg, constant_smi);
- left_side->Unuse();
- right_side->Unuse();
- dest->Split(cc);
- } else {
- // Only the case where the left side could possibly be a non-smi is left.
- JumpTarget is_smi;
- if (cc == equal) {
- // We can do the equality comparison before the smi check.
- __ Cmp(left_reg, constant_smi);
- dest->true_target()->Branch(equal);
- Condition left_is_smi = masm_->CheckSmi(left_reg);
- dest->false_target()->Branch(left_is_smi);
- } else {
- // Do the smi check, then the comparison.
- Condition left_is_smi = masm_->CheckSmi(left_reg);
- is_smi.Branch(left_is_smi, left_side, right_side);
- }
-
- // Jump or fall through to here if we are comparing a non-smi to a
- // constant smi. If the non-smi is a heap number and this is not
- // a loop condition, inline the floating point code.
- if (!is_loop_condition) {
- // Right side is a constant smi and left side has been checked
- // not to be a smi.
- JumpTarget not_number;
- __ Cmp(FieldOperand(left_reg, HeapObject::kMapOffset),
- FACTORY->heap_number_map());
- not_number.Branch(not_equal, left_side);
- __ movsd(xmm1,
- FieldOperand(left_reg, HeapNumber::kValueOffset));
- int value = constant_smi->value();
- if (value == 0) {
- __ xorpd(xmm0, xmm0);
- } else {
- Result temp = allocator()->Allocate();
- __ movl(temp.reg(), Immediate(value));
- __ cvtlsi2sd(xmm0, temp.reg());
- temp.Unuse();
- }
- __ ucomisd(xmm1, xmm0);
- // Jump to builtin for NaN.
- not_number.Branch(parity_even, left_side);
- left_side->Unuse();
- dest->true_target()->Branch(DoubleCondition(cc));
- dest->false_target()->Jump();
- not_number.Bind(left_side);
- }
-
- // Setup and call the compare stub.
- CompareFlags flags =
- static_cast<CompareFlags>(CANT_BOTH_BE_NAN | NO_SMI_CODE_IN_STUB);
- CompareStub stub(cc, strict, flags);
- Result result = frame_->CallStub(&stub, left_side, right_side);
- result.ToRegister();
- __ testq(result.reg(), result.reg());
- result.Unuse();
- if (cc == equal) {
- dest->Split(cc);
- } else {
- dest->true_target()->Branch(cc);
- dest->false_target()->Jump();
-
- // It is important for performance for this case to be at the end.
- is_smi.Bind(left_side, right_side);
- __ SmiCompare(left_reg, constant_smi);
- left_side->Unuse();
- right_side->Unuse();
- dest->Split(cc);
- }
- }
- }
-}
-
-
-// Load a comparison operand into into a XMM register. Jump to not_numbers jump
-// target passing the left and right result if the operand is not a number.
-static void LoadComparisonOperand(MacroAssembler* masm_,
- Result* operand,
- XMMRegister xmm_reg,
- Result* left_side,
- Result* right_side,
- JumpTarget* not_numbers) {
- Label done;
- if (operand->type_info().IsDouble()) {
- // Operand is known to be a heap number, just load it.
- __ movsd(xmm_reg, FieldOperand(operand->reg(), HeapNumber::kValueOffset));
- } else if (operand->type_info().IsSmi()) {
- // Operand is known to be a smi. Convert it to double and keep the original
- // smi.
- __ SmiToInteger32(kScratchRegister, operand->reg());
- __ cvtlsi2sd(xmm_reg, kScratchRegister);
- } else {
- // Operand type not known, check for smi or heap number.
- Label smi;
- __ JumpIfSmi(operand->reg(), &smi);
- if (!operand->type_info().IsNumber()) {
- __ LoadRoot(kScratchRegister, Heap::kHeapNumberMapRootIndex);
- __ cmpq(FieldOperand(operand->reg(), HeapObject::kMapOffset),
- kScratchRegister);
- not_numbers->Branch(not_equal, left_side, right_side, taken);
- }
- __ movsd(xmm_reg, FieldOperand(operand->reg(), HeapNumber::kValueOffset));
- __ jmp(&done);
-
- __ bind(&smi);
- // Comvert smi to float and keep the original smi.
- __ SmiToInteger32(kScratchRegister, operand->reg());
- __ cvtlsi2sd(xmm_reg, kScratchRegister);
- __ jmp(&done);
- }
- __ bind(&done);
-}
-
-
-void CodeGenerator::GenerateInlineNumberComparison(Result* left_side,
- Result* right_side,
- Condition cc,
- ControlDestination* dest) {
- ASSERT(left_side->is_register());
- ASSERT(right_side->is_register());
-
- JumpTarget not_numbers;
- // Load left and right operand into registers xmm0 and xmm1 and compare.
- LoadComparisonOperand(masm_, left_side, xmm0, left_side, right_side,
- ¬_numbers);
- LoadComparisonOperand(masm_, right_side, xmm1, left_side, right_side,
- ¬_numbers);
- __ ucomisd(xmm0, xmm1);
- // Bail out if a NaN is involved.
- not_numbers.Branch(parity_even, left_side, right_side);
-
- // Split to destination targets based on comparison.
- left_side->Unuse();
- right_side->Unuse();
- dest->true_target()->Branch(DoubleCondition(cc));
- dest->false_target()->Jump();
-
- not_numbers.Bind(left_side, right_side);
-}
-
-
-// Call the function just below TOS on the stack with the given
-// arguments. The receiver is the TOS.
-void CodeGenerator::CallWithArguments(ZoneList<Expression*>* args,
- CallFunctionFlags flags,
- int position) {
- // Push the arguments ("left-to-right") on the stack.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Record the position for debugging purposes.
- CodeForSourcePosition(position);
-
- // Use the shared code stub to call the function.
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- CallFunctionStub call_function(arg_count, in_loop, flags);
- Result answer = frame_->CallStub(&call_function, arg_count + 1);
- // Restore context and replace function on the stack with the
- // result of the stub invocation.
- frame_->RestoreContextRegister();
- frame_->SetElementAt(0, &answer);
-}
-
-
-void CodeGenerator::CallApplyLazy(Expression* applicand,
- Expression* receiver,
- VariableProxy* arguments,
- int position) {
- // An optimized implementation of expressions of the form
- // x.apply(y, arguments).
- // If the arguments object of the scope has not been allocated,
- // and x.apply is Function.prototype.apply, this optimization
- // just copies y and the arguments of the current function on the
- // stack, as receiver and arguments, and calls x.
- // In the implementation comments, we call x the applicand
- // and y the receiver.
- ASSERT(ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION);
- ASSERT(arguments->IsArguments());
-
- // Load applicand.apply onto the stack. This will usually
- // give us a megamorphic load site. Not super, but it works.
- Load(applicand);
- frame()->Dup();
- Handle<String> name = FACTORY->LookupAsciiSymbol("apply");
- frame()->Push(name);
- Result answer = frame()->CallLoadIC(RelocInfo::CODE_TARGET);
- __ nop();
- frame()->Push(&answer);
-
- // Load the receiver and the existing arguments object onto the
- // expression stack. Avoid allocating the arguments object here.
- Load(receiver);
- LoadFromSlot(scope()->arguments()->AsSlot(), NOT_INSIDE_TYPEOF);
-
- // Emit the source position information after having loaded the
- // receiver and the arguments.
- CodeForSourcePosition(position);
- // Contents of frame at this point:
- // Frame[0]: arguments object of the current function or the hole.
- // Frame[1]: receiver
- // Frame[2]: applicand.apply
- // Frame[3]: applicand.
-
- // Check if the arguments object has been lazily allocated
- // already. If so, just use that instead of copying the arguments
- // from the stack. This also deals with cases where a local variable
- // named 'arguments' has been introduced.
- frame_->Dup();
- Result probe = frame_->Pop();
- { VirtualFrame::SpilledScope spilled_scope;
- Label slow, done;
- bool try_lazy = true;
- if (probe.is_constant()) {
- try_lazy = probe.handle()->IsArgumentsMarker();
- } else {
- __ CompareRoot(probe.reg(), Heap::kArgumentsMarkerRootIndex);
- probe.Unuse();
- __ j(not_equal, &slow);
- }
-
- if (try_lazy) {
- Label build_args;
- // Get rid of the arguments object probe.
- frame_->Drop(); // Can be called on a spilled frame.
- // Stack now has 3 elements on it.
- // Contents of stack at this point:
- // rsp[0]: receiver
- // rsp[1]: applicand.apply
- // rsp[2]: applicand.
-
- // Check that the receiver really is a JavaScript object.
- __ movq(rax, Operand(rsp, 0));
- Condition is_smi = masm_->CheckSmi(rax);
- __ j(is_smi, &build_args);
- // We allow all JSObjects including JSFunctions. As long as
- // JS_FUNCTION_TYPE is the last instance type and it is right
- // after LAST_JS_OBJECT_TYPE, we do not have to check the upper
- // bound.
- STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
- STATIC_ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
- __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx);
- __ j(below, &build_args);
-
- // Check that applicand.apply is Function.prototype.apply.
- __ movq(rax, Operand(rsp, kPointerSize));
- is_smi = masm_->CheckSmi(rax);
- __ j(is_smi, &build_args);
- __ CmpObjectType(rax, JS_FUNCTION_TYPE, rcx);
- __ j(not_equal, &build_args);
- __ movq(rcx, FieldOperand(rax, JSFunction::kCodeEntryOffset));
- __ subq(rcx, Immediate(Code::kHeaderSize - kHeapObjectTag));
- Handle<Code> apply_code = Isolate::Current()->builtins()->FunctionApply();
- __ Cmp(rcx, apply_code);
- __ j(not_equal, &build_args);
-
- // Check that applicand is a function.
- __ movq(rdi, Operand(rsp, 2 * kPointerSize));
- is_smi = masm_->CheckSmi(rdi);
- __ j(is_smi, &build_args);
- __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
- __ j(not_equal, &build_args);
-
- // Copy the arguments to this function possibly from the
- // adaptor frame below it.
- Label invoke, adapted;
- __ movq(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
- __ Cmp(Operand(rdx, StandardFrameConstants::kContextOffset),
- Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
- __ j(equal, &adapted);
-
- // No arguments adaptor frame. Copy fixed number of arguments.
- __ Set(rax, scope()->num_parameters());
- for (int i = 0; i < scope()->num_parameters(); i++) {
- __ push(frame_->ParameterAt(i));
- }
- __ jmp(&invoke);
-
- // Arguments adaptor frame present. Copy arguments from there, but
- // avoid copying too many arguments to avoid stack overflows.
- __ bind(&adapted);
- static const uint32_t kArgumentsLimit = 1 * KB;
- __ SmiToInteger32(rax,
- Operand(rdx,
- ArgumentsAdaptorFrameConstants::kLengthOffset));
- __ movl(rcx, rax);
- __ cmpl(rax, Immediate(kArgumentsLimit));
- __ j(above, &build_args);
-
- // Loop through the arguments pushing them onto the execution
- // stack. We don't inform the virtual frame of the push, so we don't
- // have to worry about getting rid of the elements from the virtual
- // frame.
- Label loop;
- // rcx is a small non-negative integer, due to the test above.
- __ testl(rcx, rcx);
- __ j(zero, &invoke);
- __ bind(&loop);
- __ push(Operand(rdx, rcx, times_pointer_size, 1 * kPointerSize));
- __ decl(rcx);
- __ j(not_zero, &loop);
-
- // Invoke the function.
- __ bind(&invoke);
- ParameterCount actual(rax);
- __ InvokeFunction(rdi, actual, CALL_FUNCTION);
- // Drop applicand.apply and applicand from the stack, and push
- // the result of the function call, but leave the spilled frame
- // unchanged, with 3 elements, so it is correct when we compile the
- // slow-case code.
- __ addq(rsp, Immediate(2 * kPointerSize));
- __ push(rax);
- // Stack now has 1 element:
- // rsp[0]: result
- __ jmp(&done);
-
- // Slow-case: Allocate the arguments object since we know it isn't
- // there, and fall-through to the slow-case where we call
- // applicand.apply.
- __ bind(&build_args);
- // Stack now has 3 elements, because we have jumped from where:
- // rsp[0]: receiver
- // rsp[1]: applicand.apply
- // rsp[2]: applicand.
-
- // StoreArgumentsObject requires a correct frame, and may modify it.
- Result arguments_object = StoreArgumentsObject(false);
- frame_->SpillAll();
- arguments_object.ToRegister();
- frame_->EmitPush(arguments_object.reg());
- arguments_object.Unuse();
- // Stack and frame now have 4 elements.
- __ bind(&slow);
- }
-
- // Generic computation of x.apply(y, args) with no special optimization.
- // Flip applicand.apply and applicand on the stack, so
- // applicand looks like the receiver of the applicand.apply call.
- // Then process it as a normal function call.
- __ movq(rax, Operand(rsp, 3 * kPointerSize));
- __ movq(rbx, Operand(rsp, 2 * kPointerSize));
- __ movq(Operand(rsp, 2 * kPointerSize), rax);
- __ movq(Operand(rsp, 3 * kPointerSize), rbx);
-
- CallFunctionStub call_function(2, NOT_IN_LOOP, NO_CALL_FUNCTION_FLAGS);
- Result res = frame_->CallStub(&call_function, 3);
- // The function and its two arguments have been dropped.
- frame_->Drop(1); // Drop the receiver as well.
- res.ToRegister();
- frame_->EmitPush(res.reg());
- // Stack now has 1 element:
- // rsp[0]: result
- if (try_lazy) __ bind(&done);
- } // End of spilled scope.
- // Restore the context register after a call.
- frame_->RestoreContextRegister();
-}
-
-
-class DeferredStackCheck: public DeferredCode {
- public:
- DeferredStackCheck() {
- set_comment("[ DeferredStackCheck");
- }
-
- virtual void Generate();
-};
-
-
-void DeferredStackCheck::Generate() {
- StackCheckStub stub;
- __ CallStub(&stub);
-}
-
-
-void CodeGenerator::CheckStack() {
- DeferredStackCheck* deferred = new DeferredStackCheck;
- __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
- deferred->Branch(below);
- deferred->BindExit();
-}
-
-
-void CodeGenerator::VisitAndSpill(Statement* statement) {
- ASSERT(in_spilled_code());
- set_in_spilled_code(false);
- Visit(statement);
- if (frame_ != NULL) {
- frame_->SpillAll();
- }
- set_in_spilled_code(true);
-}
-
-
-void CodeGenerator::VisitStatementsAndSpill(ZoneList<Statement*>* statements) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- ASSERT(in_spilled_code());
- set_in_spilled_code(false);
- VisitStatements(statements);
- if (frame_ != NULL) {
- frame_->SpillAll();
- }
- set_in_spilled_code(true);
-
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitStatements(ZoneList<Statement*>* statements) {
-#ifdef DEBUG
- int original_height = frame_->height();
-#endif
- ASSERT(!in_spilled_code());
- for (int i = 0; has_valid_frame() && i < statements->length(); i++) {
- Visit(statements->at(i));
- }
- ASSERT(!has_valid_frame() || frame_->height() == original_height);
-}
-
-
-void CodeGenerator::VisitBlock(Block* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ Block");
- CodeForStatementPosition(node);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- VisitStatements(node->statements());
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
- // Call the runtime to declare the globals. The inevitable call
- // will sync frame elements to memory anyway, so we do it eagerly to
- // allow us to push the arguments directly into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
-
- __ movq(kScratchRegister, pairs, RelocInfo::EMBEDDED_OBJECT);
- frame_->EmitPush(rsi); // The context is the first argument.
- frame_->EmitPush(kScratchRegister);
- frame_->EmitPush(Smi::FromInt(is_eval() ? 1 : 0));
- frame_->EmitPush(Smi::FromInt(strict_mode_flag()));
- Result ignored = frame_->CallRuntime(Runtime::kDeclareGlobals, 4);
- // Return value is ignored.
-}
-
-
-void CodeGenerator::VisitDeclaration(Declaration* node) {
- Comment cmnt(masm_, "[ Declaration");
- Variable* var = node->proxy()->var();
- ASSERT(var != NULL); // must have been resolved
- Slot* slot = var->AsSlot();
-
- // If it was not possible to allocate the variable at compile time,
- // we need to "declare" it at runtime to make sure it actually
- // exists in the local context.
- if (slot != NULL && slot->type() == Slot::LOOKUP) {
- // Variables with a "LOOKUP" slot were introduced as non-locals
- // during variable resolution and must have mode DYNAMIC.
- ASSERT(var->is_dynamic());
- // For now, just do a runtime call. Sync the virtual frame eagerly
- // so we can simply push the arguments into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(rsi);
- __ movq(kScratchRegister, var->name(), RelocInfo::EMBEDDED_OBJECT);
- frame_->EmitPush(kScratchRegister);
- // Declaration nodes are always introduced in one of two modes.
- ASSERT(node->mode() == Variable::VAR || node->mode() == Variable::CONST);
- PropertyAttributes attr = node->mode() == Variable::VAR ? NONE : READ_ONLY;
- frame_->EmitPush(Smi::FromInt(attr));
- // Push initial value, if any.
- // Note: For variables we must not push an initial value (such as
- // 'undefined') because we may have a (legal) redeclaration and we
- // must not destroy the current value.
- if (node->mode() == Variable::CONST) {
- frame_->EmitPush(Heap::kTheHoleValueRootIndex);
- } else if (node->fun() != NULL) {
- Load(node->fun());
- } else {
- frame_->EmitPush(Smi::FromInt(0)); // no initial value!
- }
- Result ignored = frame_->CallRuntime(Runtime::kDeclareContextSlot, 4);
- // Ignore the return value (declarations are statements).
- return;
- }
-
- ASSERT(!var->is_global());
-
- // If we have a function or a constant, we need to initialize the variable.
- Expression* val = NULL;
- if (node->mode() == Variable::CONST) {
- val = new Literal(FACTORY->the_hole_value());
- } else {
- val = node->fun(); // NULL if we don't have a function
- }
-
- if (val != NULL) {
- {
- // Set the initial value.
- Reference target(this, node->proxy());
- Load(val);
- target.SetValue(NOT_CONST_INIT);
- // The reference is removed from the stack (preserving TOS) when
- // it goes out of scope.
- }
- // Get rid of the assigned value (declarations are statements).
- frame_->Drop();
- }
-}
-
-
-void CodeGenerator::VisitExpressionStatement(ExpressionStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ExpressionStatement");
- CodeForStatementPosition(node);
- Expression* expression = node->expression();
- expression->MarkAsStatement();
- Load(expression);
- // Remove the lingering expression result from the top of stack.
- frame_->Drop();
-}
-
-
-void CodeGenerator::VisitEmptyStatement(EmptyStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "// EmptyStatement");
- CodeForStatementPosition(node);
- // nothing to do
-}
-
-
-void CodeGenerator::VisitIfStatement(IfStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ IfStatement");
- // Generate different code depending on which parts of the if statement
- // are present or not.
- bool has_then_stm = node->HasThenStatement();
- bool has_else_stm = node->HasElseStatement();
-
- CodeForStatementPosition(node);
- JumpTarget exit;
- if (has_then_stm && has_else_stm) {
- JumpTarget then;
- JumpTarget else_;
- ControlDestination dest(&then, &else_, true);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // The else target was bound, so we compile the else part first.
- Visit(node->else_statement());
-
- // We may have dangling jumps to the then part.
- if (then.is_linked()) {
- if (has_valid_frame()) exit.Jump();
- then.Bind();
- Visit(node->then_statement());
- }
- } else {
- // The then target was bound, so we compile the then part first.
- Visit(node->then_statement());
-
- if (else_.is_linked()) {
- if (has_valid_frame()) exit.Jump();
- else_.Bind();
- Visit(node->else_statement());
- }
- }
-
- } else if (has_then_stm) {
- ASSERT(!has_else_stm);
- JumpTarget then;
- ControlDestination dest(&then, &exit, true);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // The exit label was bound. We may have dangling jumps to the
- // then part.
- if (then.is_linked()) {
- exit.Unuse();
- exit.Jump();
- then.Bind();
- Visit(node->then_statement());
- }
- } else {
- // The then label was bound.
- Visit(node->then_statement());
- }
-
- } else if (has_else_stm) {
- ASSERT(!has_then_stm);
- JumpTarget else_;
- ControlDestination dest(&exit, &else_, false);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.true_was_fall_through()) {
- // The exit label was bound. We may have dangling jumps to the
- // else part.
- if (else_.is_linked()) {
- exit.Unuse();
- exit.Jump();
- else_.Bind();
- Visit(node->else_statement());
- }
- } else {
- // The else label was bound.
- Visit(node->else_statement());
- }
-
- } else {
- ASSERT(!has_then_stm && !has_else_stm);
- // We only care about the condition's side effects (not its value
- // or control flow effect). LoadCondition is called without
- // forcing control flow.
- ControlDestination dest(&exit, &exit, true);
- LoadCondition(node->condition(), &dest, false);
- if (!dest.is_used()) {
- // We got a value on the frame rather than (or in addition to)
- // control flow.
- frame_->Drop();
- }
- }
-
- if (exit.is_linked()) {
- exit.Bind();
- }
-}
-
-
-void CodeGenerator::VisitContinueStatement(ContinueStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ContinueStatement");
- CodeForStatementPosition(node);
- node->target()->continue_target()->Jump();
-}
-
-
-void CodeGenerator::VisitBreakStatement(BreakStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ BreakStatement");
- CodeForStatementPosition(node);
- node->target()->break_target()->Jump();
-}
-
-
-void CodeGenerator::VisitReturnStatement(ReturnStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ReturnStatement");
-
- CodeForStatementPosition(node);
- Load(node->expression());
- Result return_value = frame_->Pop();
- masm()->positions_recorder()->WriteRecordedPositions();
- if (function_return_is_shadowed_) {
- function_return_.Jump(&return_value);
- } else {
- frame_->PrepareForReturn();
- if (function_return_.is_bound()) {
- // If the function return label is already bound we reuse the
- // code by jumping to the return site.
- function_return_.Jump(&return_value);
- } else {
- function_return_.Bind(&return_value);
- GenerateReturnSequence(&return_value);
- }
- }
-}
-
-
-void CodeGenerator::GenerateReturnSequence(Result* return_value) {
- // The return value is a live (but not currently reference counted)
- // reference to rax. This is safe because the current frame does not
- // contain a reference to rax (it is prepared for the return by spilling
- // all registers).
- if (FLAG_trace) {
- frame_->Push(return_value);
- *return_value = frame_->CallRuntime(Runtime::kTraceExit, 1);
- }
- return_value->ToRegister(rax);
-
- // Add a label for checking the size of the code used for returning.
-#ifdef DEBUG
- Label check_exit_codesize;
- masm_->bind(&check_exit_codesize);
-#endif
-
- // Leave the frame and return popping the arguments and the
- // receiver.
- frame_->Exit();
- int arguments_bytes = (scope()->num_parameters() + 1) * kPointerSize;
- __ Ret(arguments_bytes, rcx);
- DeleteFrame();
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
- // Add padding that will be overwritten by a debugger breakpoint.
- // The shortest return sequence generated is "movq rsp, rbp; pop rbp; ret k"
- // with length 7 (3 + 1 + 3).
- const int kPadding = Assembler::kJSReturnSequenceLength - 7;
- for (int i = 0; i < kPadding; ++i) {
- masm_->int3();
- }
- // Check that the size of the code used for returning is large enough
- // for the debugger's requirements.
- ASSERT(Assembler::kJSReturnSequenceLength <=
- masm_->SizeOfCodeGeneratedSince(&check_exit_codesize));
-#endif
-}
-
-
-void CodeGenerator::VisitWithEnterStatement(WithEnterStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ WithEnterStatement");
- CodeForStatementPosition(node);
- Load(node->expression());
- Result context;
- if (node->is_catch_block()) {
- context = frame_->CallRuntime(Runtime::kPushCatchContext, 1);
- } else {
- context = frame_->CallRuntime(Runtime::kPushContext, 1);
- }
-
- // Update context local.
- frame_->SaveContextRegister();
-
- // Verify that the runtime call result and rsi agree.
- if (FLAG_debug_code) {
- __ cmpq(context.reg(), rsi);
- __ Assert(equal, "Runtime::NewContext should end up in rsi");
- }
-}
-
-
-void CodeGenerator::VisitWithExitStatement(WithExitStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ WithExitStatement");
- CodeForStatementPosition(node);
- // Pop context.
- __ movq(rsi, ContextOperand(rsi, Context::PREVIOUS_INDEX));
- // Update context local.
- frame_->SaveContextRegister();
-}
-
-
-void CodeGenerator::VisitSwitchStatement(SwitchStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ SwitchStatement");
- CodeForStatementPosition(node);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
-
- // Compile the switch value.
- Load(node->tag());
-
- ZoneList<CaseClause*>* cases = node->cases();
- int length = cases->length();
- CaseClause* default_clause = NULL;
-
- JumpTarget next_test;
- // Compile the case label expressions and comparisons. Exit early
- // if a comparison is unconditionally true. The target next_test is
- // bound before the loop in order to indicate control flow to the
- // first comparison.
- next_test.Bind();
- for (int i = 0; i < length && !next_test.is_unused(); i++) {
- CaseClause* clause = cases->at(i);
- // The default is not a test, but remember it for later.
- if (clause->is_default()) {
- default_clause = clause;
- continue;
- }
-
- Comment cmnt(masm_, "[ Case comparison");
- // We recycle the same target next_test for each test. Bind it if
- // the previous test has not done so and then unuse it for the
- // loop.
- if (next_test.is_linked()) {
- next_test.Bind();
- }
- next_test.Unuse();
-
- // Duplicate the switch value.
- frame_->Dup();
-
- // Compile the label expression.
- Load(clause->label());
-
- // Compare and branch to the body if true or the next test if
- // false. Prefer the next test as a fall through.
- ControlDestination dest(clause->body_target(), &next_test, false);
- Comparison(node, equal, true, &dest);
-
- // If the comparison fell through to the true target, jump to the
- // actual body.
- if (dest.true_was_fall_through()) {
- clause->body_target()->Unuse();
- clause->body_target()->Jump();
- }
- }
-
- // If there was control flow to a next test from the last one
- // compiled, compile a jump to the default or break target.
- if (!next_test.is_unused()) {
- if (next_test.is_linked()) {
- next_test.Bind();
- }
- // Drop the switch value.
- frame_->Drop();
- if (default_clause != NULL) {
- default_clause->body_target()->Jump();
- } else {
- node->break_target()->Jump();
- }
- }
-
- // The last instruction emitted was a jump, either to the default
- // clause or the break target, or else to a case body from the loop
- // that compiles the tests.
- ASSERT(!has_valid_frame());
- // Compile case bodies as needed.
- for (int i = 0; i < length; i++) {
- CaseClause* clause = cases->at(i);
-
- // There are two ways to reach the body: from the corresponding
- // test or as the fall through of the previous body.
- if (clause->body_target()->is_linked() || has_valid_frame()) {
- if (clause->body_target()->is_linked()) {
- if (has_valid_frame()) {
- // If we have both a jump to the test and a fall through, put
- // a jump on the fall through path to avoid the dropping of
- // the switch value on the test path. The exception is the
- // default which has already had the switch value dropped.
- if (clause->is_default()) {
- clause->body_target()->Bind();
- } else {
- JumpTarget body;
- body.Jump();
- clause->body_target()->Bind();
- frame_->Drop();
- body.Bind();
- }
- } else {
- // No fall through to worry about.
- clause->body_target()->Bind();
- if (!clause->is_default()) {
- frame_->Drop();
- }
- }
- } else {
- // Otherwise, we have only fall through.
- ASSERT(has_valid_frame());
- }
-
- // We are now prepared to compile the body.
- Comment cmnt(masm_, "[ Case body");
- VisitStatements(clause->statements());
- }
- clause->body_target()->Unuse();
- }
-
- // We may not have a valid frame here so bind the break target only
- // if needed.
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::VisitDoWhileStatement(DoWhileStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ DoWhileStatement");
- CodeForStatementPosition(node);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- JumpTarget body(JumpTarget::BIDIRECTIONAL);
- IncrementLoopNesting();
-
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- // Label the top of the loop for the backward jump if necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // Use the continue target.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- break;
- case ALWAYS_FALSE:
- // No need to label it.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- break;
- case DONT_KNOW:
- // Continue is the test, so use the backward body target.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- body.Bind();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- // Compile the test.
- switch (info) {
- case ALWAYS_TRUE:
- // If control flow can fall off the end of the body, jump back
- // to the top and bind the break target at the exit.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- break;
- case ALWAYS_FALSE:
- // We may have had continues or breaks in the body.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- break;
- case DONT_KNOW:
- // We have to compile the test expression if it can be reached by
- // control flow falling out of the body or via continue.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (has_valid_frame()) {
- Comment cmnt(masm_, "[ DoWhileCondition");
- CodeForDoWhileConditionPosition(node);
- ControlDestination dest(&body, node->break_target(), false);
- LoadCondition(node->cond(), &dest, true);
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- break;
- }
-
- DecrementLoopNesting();
- node->continue_target()->Unuse();
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::VisitWhileStatement(WhileStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ WhileStatement");
- CodeForStatementPosition(node);
-
- // If the condition is always false and has no side effects, we do not
- // need to compile anything.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- if (info == ALWAYS_FALSE) return;
-
- // Do not duplicate conditions that may have function literal
- // subexpressions. This can cause us to compile the function literal
- // twice.
- bool test_at_bottom = !node->may_have_function_literal();
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- IncrementLoopNesting();
- JumpTarget body;
- if (test_at_bottom) {
- body.set_direction(JumpTarget::BIDIRECTIONAL);
- }
-
- // Based on the condition analysis, compile the test as necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // We will not compile the test expression. Label the top of the
- // loop with the continue target.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- break;
- case DONT_KNOW: {
- if (test_at_bottom) {
- // Continue is the test at the bottom, no need to label the test
- // at the top. The body is a backward target.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- } else {
- // Label the test at the top as the continue target. The body
- // is a forward-only target.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- }
- // Compile the test with the body as the true target and preferred
- // fall-through and with the break target as the false target.
- ControlDestination dest(&body, node->break_target(), true);
- LoadCondition(node->cond(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // If we got the break target as fall-through, the test may have
- // been unconditionally false (if there are no jumps to the
- // body).
- if (!body.is_linked()) {
- DecrementLoopNesting();
- return;
- }
-
- // Otherwise, jump around the body on the fall through and then
- // bind the body target.
- node->break_target()->Unuse();
- node->break_target()->Jump();
- body.Bind();
- }
- break;
- }
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- Visit(node->body());
-
- // Based on the condition analysis, compile the backward jump as
- // necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // The loop body has been labeled with the continue target.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- break;
- case DONT_KNOW:
- if (test_at_bottom) {
- // If we have chosen to recompile the test at the bottom,
- // then it is the continue target.
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
- if (has_valid_frame()) {
- // The break target is the fall-through (body is a backward
- // jump from here and thus an invalid fall-through).
- ControlDestination dest(&body, node->break_target(), false);
- LoadCondition(node->cond(), &dest, true);
- }
- } else {
- // If we have chosen not to recompile the test at the bottom,
- // jump back to the one at the top.
- if (has_valid_frame()) {
- node->continue_target()->Jump();
- }
- }
- break;
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- // The break target may be already bound (by the condition), or there
- // may not be a valid frame. Bind it only if needed.
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
-}
-
-
-void CodeGenerator::SetTypeForStackSlot(Slot* slot, TypeInfo info) {
- ASSERT(slot->type() == Slot::LOCAL || slot->type() == Slot::PARAMETER);
- if (slot->type() == Slot::LOCAL) {
- frame_->SetTypeForLocalAt(slot->index(), info);
- } else {
- frame_->SetTypeForParamAt(slot->index(), info);
- }
- if (FLAG_debug_code && info.IsSmi()) {
- if (slot->type() == Slot::LOCAL) {
- frame_->PushLocalAt(slot->index());
- } else {
- frame_->PushParameterAt(slot->index());
- }
- Result var = frame_->Pop();
- var.ToRegister();
- __ AbortIfNotSmi(var.reg());
- }
-}
-
-
-void CodeGenerator::GenerateFastSmiLoop(ForStatement* node) {
- // A fast smi loop is a for loop with an initializer
- // that is a simple assignment of a smi to a stack variable,
- // a test that is a simple test of that variable against a smi constant,
- // and a step that is a increment/decrement of the variable, and
- // where the variable isn't modified in the loop body.
- // This guarantees that the variable is always a smi.
-
- Variable* loop_var = node->loop_variable();
- Smi* initial_value = *Handle<Smi>::cast(node->init()
- ->StatementAsSimpleAssignment()->value()->AsLiteral()->handle());
- Smi* limit_value = *Handle<Smi>::cast(
- node->cond()->AsCompareOperation()->right()->AsLiteral()->handle());
- Token::Value compare_op =
- node->cond()->AsCompareOperation()->op();
- bool increments =
- node->next()->StatementAsCountOperation()->op() == Token::INC;
-
- // Check that the condition isn't initially false.
- bool initially_false = false;
- int initial_int_value = initial_value->value();
- int limit_int_value = limit_value->value();
- switch (compare_op) {
- case Token::LT:
- initially_false = initial_int_value >= limit_int_value;
- break;
- case Token::LTE:
- initially_false = initial_int_value > limit_int_value;
- break;
- case Token::GT:
- initially_false = initial_int_value <= limit_int_value;
- break;
- case Token::GTE:
- initially_false = initial_int_value < limit_int_value;
- break;
- default:
- UNREACHABLE();
- }
- if (initially_false) return;
-
- // Only check loop condition at the end.
-
- Visit(node->init());
-
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
- // Set type and stack height of BreakTargets.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
-
- IncrementLoopNesting();
- loop.Bind();
-
- // Set number type of the loop variable to smi.
- CheckStack(); // TODO(1222600): ignore if body contains calls.
-
- SetTypeForStackSlot(loop_var->AsSlot(), TypeInfo::Smi());
- Visit(node->body());
-
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
-
- if (has_valid_frame()) {
- CodeForStatementPosition(node);
- Slot* loop_var_slot = loop_var->AsSlot();
- if (loop_var_slot->type() == Slot::LOCAL) {
- frame_->TakeLocalAt(loop_var_slot->index());
- } else {
- ASSERT(loop_var_slot->type() == Slot::PARAMETER);
- frame_->TakeParameterAt(loop_var_slot->index());
- }
- Result loop_var_result = frame_->Pop();
- if (!loop_var_result.is_register()) {
- loop_var_result.ToRegister();
- }
- Register loop_var_reg = loop_var_result.reg();
- frame_->Spill(loop_var_reg);
- if (increments) {
- __ SmiAddConstant(loop_var_reg,
- loop_var_reg,
- Smi::FromInt(1));
- } else {
- __ SmiSubConstant(loop_var_reg,
- loop_var_reg,
- Smi::FromInt(1));
- }
-
- frame_->Push(&loop_var_result);
- if (loop_var_slot->type() == Slot::LOCAL) {
- frame_->StoreToLocalAt(loop_var_slot->index());
- } else {
- ASSERT(loop_var_slot->type() == Slot::PARAMETER);
- frame_->StoreToParameterAt(loop_var_slot->index());
- }
- frame_->Drop();
-
- __ SmiCompare(loop_var_reg, limit_value);
- Condition condition;
- switch (compare_op) {
- case Token::LT:
- condition = less;
- break;
- case Token::LTE:
- condition = less_equal;
- break;
- case Token::GT:
- condition = greater;
- break;
- case Token::GTE:
- condition = greater_equal;
- break;
- default:
- condition = never;
- UNREACHABLE();
- }
- loop.Branch(condition);
- }
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
-}
-
-
-void CodeGenerator::VisitForStatement(ForStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ ForStatement");
- CodeForStatementPosition(node);
-
- if (node->is_fast_smi_loop()) {
- GenerateFastSmiLoop(node);
- return;
- }
-
- // Compile the init expression if present.
- if (node->init() != NULL) {
- Visit(node->init());
- }
-
- // If the condition is always false and has no side effects, we do not
- // need to compile anything else.
- ConditionAnalysis info = AnalyzeCondition(node->cond());
- if (info == ALWAYS_FALSE) return;
-
- // Do not duplicate conditions that may have function literal
- // subexpressions. This can cause us to compile the function literal
- // twice.
- bool test_at_bottom = !node->may_have_function_literal();
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- IncrementLoopNesting();
-
- // Target for backward edge if no test at the bottom, otherwise
- // unused.
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
-
- // Target for backward edge if there is a test at the bottom,
- // otherwise used as target for test at the top.
- JumpTarget body;
- if (test_at_bottom) {
- body.set_direction(JumpTarget::BIDIRECTIONAL);
- }
-
- // Based on the condition analysis, compile the test as necessary.
- switch (info) {
- case ALWAYS_TRUE:
- // We will not compile the test expression. Label the top of the
- // loop.
- if (node->next() == NULL) {
- // Use the continue target if there is no update expression.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- } else {
- // Otherwise use the backward loop target.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- loop.Bind();
- }
- break;
- case DONT_KNOW: {
- if (test_at_bottom) {
- // Continue is either the update expression or the test at the
- // bottom, no need to label the test at the top.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- } else if (node->next() == NULL) {
- // We are not recompiling the test at the bottom and there is no
- // update expression.
- node->continue_target()->set_direction(JumpTarget::BIDIRECTIONAL);
- node->continue_target()->Bind();
- } else {
- // We are not recompiling the test at the bottom and there is an
- // update expression.
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
- loop.Bind();
- }
-
- // Compile the test with the body as the true target and preferred
- // fall-through and with the break target as the false target.
- ControlDestination dest(&body, node->break_target(), true);
- LoadCondition(node->cond(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // If we got the break target as fall-through, the test may have
- // been unconditionally false (if there are no jumps to the
- // body).
- if (!body.is_linked()) {
- DecrementLoopNesting();
- return;
- }
-
- // Otherwise, jump around the body on the fall through and then
- // bind the body target.
- node->break_target()->Unuse();
- node->break_target()->Jump();
- body.Bind();
- }
- break;
- }
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- CheckStack(); // TODO(1222600): ignore if body contains calls.
-
- Visit(node->body());
-
- // If there is an update expression, compile it if necessary.
- if (node->next() != NULL) {
- if (node->continue_target()->is_linked()) {
- node->continue_target()->Bind();
- }
-
- // Control can reach the update by falling out of the body or by a
- // continue.
- if (has_valid_frame()) {
- // Record the source position of the statement as this code which
- // is after the code for the body actually belongs to the loop
- // statement and not the body.
- CodeForStatementPosition(node);
- Visit(node->next());
- }
- }
-
- // Based on the condition analysis, compile the backward jump as
- // necessary.
- switch (info) {
- case ALWAYS_TRUE:
- if (has_valid_frame()) {
- if (node->next() == NULL) {
- node->continue_target()->Jump();
- } else {
- loop.Jump();
- }
- }
- break;
- case DONT_KNOW:
- if (test_at_bottom) {
- if (node->continue_target()->is_linked()) {
- // We can have dangling jumps to the continue target if there
- // was no update expression.
- node->continue_target()->Bind();
- }
- // Control can reach the test at the bottom by falling out of
- // the body, by a continue in the body, or from the update
- // expression.
- if (has_valid_frame()) {
- // The break target is the fall-through (body is a backward
- // jump from here).
- ControlDestination dest(&body, node->break_target(), false);
- LoadCondition(node->cond(), &dest, true);
- }
- } else {
- // Otherwise, jump back to the test at the top.
- if (has_valid_frame()) {
- if (node->next() == NULL) {
- node->continue_target()->Jump();
- } else {
- loop.Jump();
- }
- }
- }
- break;
- case ALWAYS_FALSE:
- UNREACHABLE();
- break;
- }
-
- // The break target may be already bound (by the condition), or there
- // may not be a valid frame. Bind it only if needed.
- if (node->break_target()->is_linked()) {
- node->break_target()->Bind();
- }
- DecrementLoopNesting();
-}
-
-
-void CodeGenerator::VisitForInStatement(ForInStatement* node) {
- ASSERT(!in_spilled_code());
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ ForInStatement");
- CodeForStatementPosition(node);
-
- JumpTarget primitive;
- JumpTarget jsobject;
- JumpTarget fixed_array;
- JumpTarget entry(JumpTarget::BIDIRECTIONAL);
- JumpTarget end_del_check;
- JumpTarget exit;
-
- // Get the object to enumerate over (converted to JSObject).
- LoadAndSpill(node->enumerable());
-
- // Both SpiderMonkey and kjs ignore null and undefined in contrast
- // to the specification. 12.6.4 mandates a call to ToObject.
- frame_->EmitPop(rax);
-
- // rax: value to be iterated over
- __ CompareRoot(rax, Heap::kUndefinedValueRootIndex);
- exit.Branch(equal);
- __ CompareRoot(rax, Heap::kNullValueRootIndex);
- exit.Branch(equal);
-
- // Stack layout in body:
- // [iteration counter (smi)] <- slot 0
- // [length of array] <- slot 1
- // [FixedArray] <- slot 2
- // [Map or 0] <- slot 3
- // [Object] <- slot 4
-
- // Check if enumerable is already a JSObject
- // rax: value to be iterated over
- Condition is_smi = masm_->CheckSmi(rax);
- primitive.Branch(is_smi);
- __ CmpObjectType(rax, FIRST_JS_OBJECT_TYPE, rcx);
- jsobject.Branch(above_equal);
-
- primitive.Bind();
- frame_->EmitPush(rax);
- frame_->InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION, 1);
- // function call returns the value in rax, which is where we want it below
-
- jsobject.Bind();
- // Get the set of properties (as a FixedArray or Map).
- // rax: value to be iterated over
- frame_->EmitPush(rax); // Push the object being iterated over.
-
-
- // Check cache validity in generated code. This is a fast case for
- // the JSObject::IsSimpleEnum cache validity checks. If we cannot
- // guarantee cache validity, call the runtime system to check cache
- // validity or get the property names in a fixed array.
- JumpTarget call_runtime;
- JumpTarget loop(JumpTarget::BIDIRECTIONAL);
- JumpTarget check_prototype;
- JumpTarget use_cache;
- __ movq(rcx, rax);
- loop.Bind();
- // Check that there are no elements.
- __ movq(rdx, FieldOperand(rcx, JSObject::kElementsOffset));
- __ CompareRoot(rdx, Heap::kEmptyFixedArrayRootIndex);
- call_runtime.Branch(not_equal);
- // Check that instance descriptors are not empty so that we can
- // check for an enum cache. Leave the map in ebx for the subsequent
- // prototype load.
- __ movq(rbx, FieldOperand(rcx, HeapObject::kMapOffset));
- __ movq(rdx, FieldOperand(rbx, Map::kInstanceDescriptorsOffset));
- __ CompareRoot(rdx, Heap::kEmptyDescriptorArrayRootIndex);
- call_runtime.Branch(equal);
- // Check that there in an enum cache in the non-empty instance
- // descriptors. This is the case if the next enumeration index
- // field does not contain a smi.
- __ movq(rdx, FieldOperand(rdx, DescriptorArray::kEnumerationIndexOffset));
- is_smi = masm_->CheckSmi(rdx);
- call_runtime.Branch(is_smi);
- // For all objects but the receiver, check that the cache is empty.
- __ cmpq(rcx, rax);
- check_prototype.Branch(equal);
- __ movq(rdx, FieldOperand(rdx, DescriptorArray::kEnumCacheBridgeCacheOffset));
- __ CompareRoot(rdx, Heap::kEmptyFixedArrayRootIndex);
- call_runtime.Branch(not_equal);
- check_prototype.Bind();
- // Load the prototype from the map and loop if non-null.
- __ movq(rcx, FieldOperand(rbx, Map::kPrototypeOffset));
- __ CompareRoot(rcx, Heap::kNullValueRootIndex);
- loop.Branch(not_equal);
- // The enum cache is valid. Load the map of the object being
- // iterated over and use the cache for the iteration.
- __ movq(rax, FieldOperand(rax, HeapObject::kMapOffset));
- use_cache.Jump();
-
- call_runtime.Bind();
- // Call the runtime to get the property names for the object.
- frame_->EmitPush(rax); // push the Object (slot 4) for the runtime call
- frame_->CallRuntime(Runtime::kGetPropertyNamesFast, 1);
-
- // If we got a Map, we can do a fast modification check.
- // Otherwise, we got a FixedArray, and we have to do a slow check.
- // rax: map or fixed array (result from call to
- // Runtime::kGetPropertyNamesFast)
- __ movq(rdx, rax);
- __ movq(rcx, FieldOperand(rdx, HeapObject::kMapOffset));
- __ CompareRoot(rcx, Heap::kMetaMapRootIndex);
- fixed_array.Branch(not_equal);
-
- use_cache.Bind();
- // Get enum cache
- // rax: map (either the result from a call to
- // Runtime::kGetPropertyNamesFast or has been fetched directly from
- // the object)
- __ movq(rcx, rax);
- __ movq(rcx, FieldOperand(rcx, Map::kInstanceDescriptorsOffset));
- // Get the bridge array held in the enumeration index field.
- __ movq(rcx, FieldOperand(rcx, DescriptorArray::kEnumerationIndexOffset));
- // Get the cache from the bridge array.
- __ movq(rdx, FieldOperand(rcx, DescriptorArray::kEnumCacheBridgeCacheOffset));
-
- frame_->EmitPush(rax); // <- slot 3
- frame_->EmitPush(rdx); // <- slot 2
- __ movq(rax, FieldOperand(rdx, FixedArray::kLengthOffset));
- frame_->EmitPush(rax); // <- slot 1
- frame_->EmitPush(Smi::FromInt(0)); // <- slot 0
- entry.Jump();
-
- fixed_array.Bind();
- // rax: fixed array (result from call to Runtime::kGetPropertyNamesFast)
- frame_->EmitPush(Smi::FromInt(0)); // <- slot 3
- frame_->EmitPush(rax); // <- slot 2
-
- // Push the length of the array and the initial index onto the stack.
- __ movq(rax, FieldOperand(rax, FixedArray::kLengthOffset));
- frame_->EmitPush(rax); // <- slot 1
- frame_->EmitPush(Smi::FromInt(0)); // <- slot 0
-
- // Condition.
- entry.Bind();
- // Grab the current frame's height for the break and continue
- // targets only after all the state is pushed on the frame.
- node->break_target()->set_direction(JumpTarget::FORWARD_ONLY);
- node->continue_target()->set_direction(JumpTarget::FORWARD_ONLY);
-
- __ movq(rax, frame_->ElementAt(0)); // load the current count
- __ SmiCompare(frame_->ElementAt(1), rax); // compare to the array length
- node->break_target()->Branch(below_equal);
-
- // Get the i'th entry of the array.
- __ movq(rdx, frame_->ElementAt(2));
- SmiIndex index = masm_->SmiToIndex(rbx, rax, kPointerSizeLog2);
- __ movq(rbx,
- FieldOperand(rdx, index.reg, index.scale, FixedArray::kHeaderSize));
-
- // Get the expected map from the stack or a zero map in the
- // permanent slow case rax: current iteration count rbx: i'th entry
- // of the enum cache
- __ movq(rdx, frame_->ElementAt(3));
- // Check if the expected map still matches that of the enumerable.
- // If not, we have to filter the key.
- // rax: current iteration count
- // rbx: i'th entry of the enum cache
- // rdx: expected map value
- __ movq(rcx, frame_->ElementAt(4));
- __ movq(rcx, FieldOperand(rcx, HeapObject::kMapOffset));
- __ cmpq(rcx, rdx);
- end_del_check.Branch(equal);
-
- // Convert the entry to a string (or null if it isn't a property anymore).
- frame_->EmitPush(frame_->ElementAt(4)); // push enumerable
- frame_->EmitPush(rbx); // push entry
- frame_->InvokeBuiltin(Builtins::FILTER_KEY, CALL_FUNCTION, 2);
- __ movq(rbx, rax);
-
- // If the property has been removed while iterating, we just skip it.
- __ Cmp(rbx, Smi::FromInt(0));
- node->continue_target()->Branch(equal);
-
- end_del_check.Bind();
- // Store the entry in the 'each' expression and take another spin in the
- // loop. rdx: i'th entry of the enum cache (or string there of)
- frame_->EmitPush(rbx);
- { Reference each(this, node->each());
- // Loading a reference may leave the frame in an unspilled state.
- frame_->SpillAll();
- if (!each.is_illegal()) {
- if (each.size() > 0) {
- frame_->EmitPush(frame_->ElementAt(each.size()));
- each.SetValue(NOT_CONST_INIT);
- frame_->Drop(2); // Drop the original and the copy of the element.
- } else {
- // If the reference has size zero then we can use the value below
- // the reference as if it were above the reference, instead of pushing
- // a new copy of it above the reference.
- each.SetValue(NOT_CONST_INIT);
- frame_->Drop(); // Drop the original of the element.
- }
- }
- }
- // Unloading a reference may leave the frame in an unspilled state.
- frame_->SpillAll();
-
- // Body.
- CheckStack(); // TODO(1222600): ignore if body contains calls.
- VisitAndSpill(node->body());
-
- // Next. Reestablish a spilled frame in case we are coming here via
- // a continue in the body.
- node->continue_target()->Bind();
- frame_->SpillAll();
- frame_->EmitPop(rax);
- __ SmiAddConstant(rax, rax, Smi::FromInt(1));
- frame_->EmitPush(rax);
- entry.Jump();
-
- // Cleanup. No need to spill because VirtualFrame::Drop is safe for
- // any frame.
- node->break_target()->Bind();
- frame_->Drop(5);
-
- // Exit.
- exit.Bind();
-
- node->continue_target()->Unuse();
- node->break_target()->Unuse();
-}
-
-
-void CodeGenerator::VisitTryCatchStatement(TryCatchStatement* node) {
- ASSERT(!in_spilled_code());
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ TryCatchStatement");
- CodeForStatementPosition(node);
-
- JumpTarget try_block;
- JumpTarget exit;
-
- try_block.Call();
- // --- Catch block ---
- frame_->EmitPush(rax);
-
- // Store the caught exception in the catch variable.
- Variable* catch_var = node->catch_var()->var();
- ASSERT(catch_var != NULL && catch_var->AsSlot() != NULL);
- StoreToSlot(catch_var->AsSlot(), NOT_CONST_INIT);
-
- // Remove the exception from the stack.
- frame_->Drop();
-
- VisitStatementsAndSpill(node->catch_block()->statements());
- if (has_valid_frame()) {
- exit.Jump();
- }
-
-
- // --- Try block ---
- try_block.Bind();
-
- frame_->PushTryHandler(TRY_CATCH_HANDLER);
- int handler_height = frame_->height();
-
- // Shadow the jump targets for all escapes from the try block, including
- // returns. During shadowing, the original target is hidden as the
- // ShadowTarget and operations on the original actually affect the
- // shadowing target.
- //
- // We should probably try to unify the escaping targets and the return
- // target.
- int nof_escapes = node->escaping_targets()->length();
- List<ShadowTarget*> shadows(1 + nof_escapes);
-
- // Add the shadow target for the function return.
- static const int kReturnShadowIndex = 0;
- shadows.Add(new ShadowTarget(&function_return_));
- bool function_return_was_shadowed = function_return_is_shadowed_;
- function_return_is_shadowed_ = true;
- ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_);
-
- // Add the remaining shadow targets.
- for (int i = 0; i < nof_escapes; i++) {
- shadows.Add(new ShadowTarget(node->escaping_targets()->at(i)));
- }
-
- // Generate code for the statements in the try block.
- VisitStatementsAndSpill(node->try_block()->statements());
-
- // Stop the introduced shadowing and count the number of required unlinks.
- // After shadowing stops, the original targets are unshadowed and the
- // ShadowTargets represent the formerly shadowing targets.
- bool has_unlinks = false;
- for (int i = 0; i < shadows.length(); i++) {
- shadows[i]->StopShadowing();
- has_unlinks = has_unlinks || shadows[i]->is_linked();
- }
- function_return_is_shadowed_ = function_return_was_shadowed;
-
- // Get an external reference to the handler address.
- ExternalReference handler_address(Isolate::k_handler_address, isolate());
-
- // Make sure that there's nothing left on the stack above the
- // handler structure.
- if (FLAG_debug_code) {
- __ movq(kScratchRegister, handler_address);
- __ cmpq(rsp, Operand(kScratchRegister, 0));
- __ Assert(equal, "stack pointer should point to top handler");
- }
-
- // If we can fall off the end of the try block, unlink from try chain.
- if (has_valid_frame()) {
- // The next handler address is on top of the frame. Unlink from
- // the handler list and drop the rest of this handler from the
- // frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- __ movq(kScratchRegister, handler_address);
- frame_->EmitPop(Operand(kScratchRegister, 0));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
- if (has_unlinks) {
- exit.Jump();
- }
- }
-
- // Generate unlink code for the (formerly) shadowing targets that
- // have been jumped to. Deallocate each shadow target.
- Result return_value;
- for (int i = 0; i < shadows.length(); i++) {
- if (shadows[i]->is_linked()) {
- // Unlink from try chain; be careful not to destroy the TOS if
- // there is one.
- if (i == kReturnShadowIndex) {
- shadows[i]->Bind(&return_value);
- return_value.ToRegister(rax);
- } else {
- shadows[i]->Bind();
- }
- // Because we can be jumping here (to spilled code) from
- // unspilled code, we need to reestablish a spilled frame at
- // this block.
- frame_->SpillAll();
-
- // Reload sp from the top handler, because some statements that we
- // break from (eg, for...in) may have left stuff on the stack.
- __ movq(kScratchRegister, handler_address);
- __ movq(rsp, Operand(kScratchRegister, 0));
- frame_->Forget(frame_->height() - handler_height);
-
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- __ movq(kScratchRegister, handler_address);
- frame_->EmitPop(Operand(kScratchRegister, 0));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- if (i == kReturnShadowIndex) {
- if (!function_return_is_shadowed_) frame_->PrepareForReturn();
- shadows[i]->other_target()->Jump(&return_value);
- } else {
- shadows[i]->other_target()->Jump();
- }
- }
- }
-
- exit.Bind();
-}
-
-
-void CodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* node) {
- ASSERT(!in_spilled_code());
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ TryFinallyStatement");
- CodeForStatementPosition(node);
-
- // State: Used to keep track of reason for entering the finally
- // block. Should probably be extended to hold information for
- // break/continue from within the try block.
- enum { FALLING, THROWING, JUMPING };
-
- JumpTarget try_block;
- JumpTarget finally_block;
-
- try_block.Call();
-
- frame_->EmitPush(rax);
- // In case of thrown exceptions, this is where we continue.
- __ Move(rcx, Smi::FromInt(THROWING));
- finally_block.Jump();
-
- // --- Try block ---
- try_block.Bind();
-
- frame_->PushTryHandler(TRY_FINALLY_HANDLER);
- int handler_height = frame_->height();
-
- // Shadow the jump targets for all escapes from the try block, including
- // returns. During shadowing, the original target is hidden as the
- // ShadowTarget and operations on the original actually affect the
- // shadowing target.
- //
- // We should probably try to unify the escaping targets and the return
- // target.
- int nof_escapes = node->escaping_targets()->length();
- List<ShadowTarget*> shadows(1 + nof_escapes);
-
- // Add the shadow target for the function return.
- static const int kReturnShadowIndex = 0;
- shadows.Add(new ShadowTarget(&function_return_));
- bool function_return_was_shadowed = function_return_is_shadowed_;
- function_return_is_shadowed_ = true;
- ASSERT(shadows[kReturnShadowIndex]->other_target() == &function_return_);
-
- // Add the remaining shadow targets.
- for (int i = 0; i < nof_escapes; i++) {
- shadows.Add(new ShadowTarget(node->escaping_targets()->at(i)));
- }
-
- // Generate code for the statements in the try block.
- VisitStatementsAndSpill(node->try_block()->statements());
-
- // Stop the introduced shadowing and count the number of required unlinks.
- // After shadowing stops, the original targets are unshadowed and the
- // ShadowTargets represent the formerly shadowing targets.
- int nof_unlinks = 0;
- for (int i = 0; i < shadows.length(); i++) {
- shadows[i]->StopShadowing();
- if (shadows[i]->is_linked()) nof_unlinks++;
- }
- function_return_is_shadowed_ = function_return_was_shadowed;
-
- // Get an external reference to the handler address.
- ExternalReference handler_address(Isolate::k_handler_address, isolate());
-
- // If we can fall off the end of the try block, unlink from the try
- // chain and set the state on the frame to FALLING.
- if (has_valid_frame()) {
- // The next handler address is on top of the frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- __ movq(kScratchRegister, handler_address);
- frame_->EmitPop(Operand(kScratchRegister, 0));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- // Fake a top of stack value (unneeded when FALLING) and set the
- // state in ecx, then jump around the unlink blocks if any.
- frame_->EmitPush(Heap::kUndefinedValueRootIndex);
- __ Move(rcx, Smi::FromInt(FALLING));
- if (nof_unlinks > 0) {
- finally_block.Jump();
- }
- }
-
- // Generate code to unlink and set the state for the (formerly)
- // shadowing targets that have been jumped to.
- for (int i = 0; i < shadows.length(); i++) {
- if (shadows[i]->is_linked()) {
- // If we have come from the shadowed return, the return value is
- // on the virtual frame. We must preserve it until it is
- // pushed.
- if (i == kReturnShadowIndex) {
- Result return_value;
- shadows[i]->Bind(&return_value);
- return_value.ToRegister(rax);
- } else {
- shadows[i]->Bind();
- }
- // Because we can be jumping here (to spilled code) from
- // unspilled code, we need to reestablish a spilled frame at
- // this block.
- frame_->SpillAll();
-
- // Reload sp from the top handler, because some statements that
- // we break from (eg, for...in) may have left stuff on the
- // stack.
- __ movq(kScratchRegister, handler_address);
- __ movq(rsp, Operand(kScratchRegister, 0));
- frame_->Forget(frame_->height() - handler_height);
-
- // Unlink this handler and drop it from the frame.
- STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
- __ movq(kScratchRegister, handler_address);
- frame_->EmitPop(Operand(kScratchRegister, 0));
- frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-
- if (i == kReturnShadowIndex) {
- // If this target shadowed the function return, materialize
- // the return value on the stack.
- frame_->EmitPush(rax);
- } else {
- // Fake TOS for targets that shadowed breaks and continues.
- frame_->EmitPush(Heap::kUndefinedValueRootIndex);
- }
- __ Move(rcx, Smi::FromInt(JUMPING + i));
- if (--nof_unlinks > 0) {
- // If this is not the last unlink block, jump around the next.
- finally_block.Jump();
- }
- }
- }
-
- // --- Finally block ---
- finally_block.Bind();
-
- // Push the state on the stack.
- frame_->EmitPush(rcx);
-
- // We keep two elements on the stack - the (possibly faked) result
- // and the state - while evaluating the finally block.
- //
- // Generate code for the statements in the finally block.
- VisitStatementsAndSpill(node->finally_block()->statements());
-
- if (has_valid_frame()) {
- // Restore state and return value or faked TOS.
- frame_->EmitPop(rcx);
- frame_->EmitPop(rax);
- }
-
- // Generate code to jump to the right destination for all used
- // formerly shadowing targets. Deallocate each shadow target.
- for (int i = 0; i < shadows.length(); i++) {
- if (has_valid_frame() && shadows[i]->is_bound()) {
- BreakTarget* original = shadows[i]->other_target();
- __ SmiCompare(rcx, Smi::FromInt(JUMPING + i));
- if (i == kReturnShadowIndex) {
- // The return value is (already) in rax.
- Result return_value = allocator_->Allocate(rax);
- ASSERT(return_value.is_valid());
- if (function_return_is_shadowed_) {
- original->Branch(equal, &return_value);
- } else {
- // Branch around the preparation for return which may emit
- // code.
- JumpTarget skip;
- skip.Branch(not_equal);
- frame_->PrepareForReturn();
- original->Jump(&return_value);
- skip.Bind();
- }
- } else {
- original->Branch(equal);
- }
- }
- }
-
- if (has_valid_frame()) {
- // Check if we need to rethrow the exception.
- JumpTarget exit;
- __ SmiCompare(rcx, Smi::FromInt(THROWING));
- exit.Branch(not_equal);
-
- // Rethrow exception.
- frame_->EmitPush(rax); // undo pop from above
- frame_->CallRuntime(Runtime::kReThrow, 1);
-
- // Done.
- exit.Bind();
- }
-}
-
-
-void CodeGenerator::VisitDebuggerStatement(DebuggerStatement* node) {
- ASSERT(!in_spilled_code());
- Comment cmnt(masm_, "[ DebuggerStatement");
- CodeForStatementPosition(node);
-#ifdef ENABLE_DEBUGGER_SUPPORT
- // Spill everything, even constants, to the frame.
- frame_->SpillAll();
-
- frame_->DebugBreak();
- // Ignore the return value.
-#endif
-}
-
-
-void CodeGenerator::InstantiateFunction(
- Handle<SharedFunctionInfo> function_info,
- bool pretenure) {
- // The inevitable call will sync frame elements to memory anyway, so
- // we do it eagerly to allow us to push the arguments directly into
- // place.
- frame_->SyncRange(0, frame_->element_count() - 1);
-
- // Use the fast case closure allocation code that allocates in new
- // space for nested functions that don't need literals cloning.
- if (!pretenure &&
- scope()->is_function_scope() &&
- function_info->num_literals() == 0) {
- FastNewClosureStub stub(
- function_info->strict_mode() ? kStrictMode : kNonStrictMode);
- frame_->Push(function_info);
- Result answer = frame_->CallStub(&stub, 1);
- frame_->Push(&answer);
- } else {
- // Call the runtime to instantiate the function based on the
- // shared function info.
- frame_->EmitPush(rsi);
- frame_->EmitPush(function_info);
- frame_->EmitPush(pretenure
- ? FACTORY->true_value()
- : FACTORY->false_value());
- Result result = frame_->CallRuntime(Runtime::kNewClosure, 3);
- frame_->Push(&result);
- }
-}
-
-
-void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) {
- Comment cmnt(masm_, "[ FunctionLiteral");
-
- // Build the function info and instantiate it.
- Handle<SharedFunctionInfo> function_info =
- Compiler::BuildFunctionInfo(node, script());
- // Check for stack-overflow exception.
- if (function_info.is_null()) {
- SetStackOverflow();
- return;
- }
- InstantiateFunction(function_info, node->pretenure());
-}
-
-
-void CodeGenerator::VisitSharedFunctionInfoLiteral(
- SharedFunctionInfoLiteral* node) {
- Comment cmnt(masm_, "[ SharedFunctionInfoLiteral");
- InstantiateFunction(node->shared_function_info(), false);
-}
-
-
-void CodeGenerator::VisitConditional(Conditional* node) {
- Comment cmnt(masm_, "[ Conditional");
- JumpTarget then;
- JumpTarget else_;
- JumpTarget exit;
- ControlDestination dest(&then, &else_, true);
- LoadCondition(node->condition(), &dest, true);
-
- if (dest.false_was_fall_through()) {
- // The else target was bound, so we compile the else part first.
- Load(node->else_expression());
-
- if (then.is_linked()) {
- exit.Jump();
- then.Bind();
- Load(node->then_expression());
- }
- } else {
- // The then target was bound, so we compile the then part first.
- Load(node->then_expression());
-
- if (else_.is_linked()) {
- exit.Jump();
- else_.Bind();
- Load(node->else_expression());
- }
- }
-
- exit.Bind();
-}
-
-
-void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
- if (slot->type() == Slot::LOOKUP) {
- ASSERT(slot->var()->is_dynamic());
-
- JumpTarget slow;
- JumpTarget done;
- Result value;
-
- // Generate fast case for loading from slots that correspond to
- // local/global variables or arguments unless they are shadowed by
- // eval-introduced bindings.
- EmitDynamicLoadFromSlotFastCase(slot,
- typeof_state,
- &value,
- &slow,
- &done);
-
- slow.Bind();
- // A runtime call is inevitable. We eagerly sync frame elements
- // to memory so that we can push the arguments directly into place
- // on top of the frame.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(rsi);
- __ movq(kScratchRegister, slot->var()->name(), RelocInfo::EMBEDDED_OBJECT);
- frame_->EmitPush(kScratchRegister);
- if (typeof_state == INSIDE_TYPEOF) {
- value =
- frame_->CallRuntime(Runtime::kLoadContextSlotNoReferenceError, 2);
- } else {
- value = frame_->CallRuntime(Runtime::kLoadContextSlot, 2);
- }
-
- done.Bind(&value);
- frame_->Push(&value);
-
- } else if (slot->var()->mode() == Variable::CONST) {
- // Const slots may contain 'the hole' value (the constant hasn't been
- // initialized yet) which needs to be converted into the 'undefined'
- // value.
- //
- // We currently spill the virtual frame because constants use the
- // potentially unsafe direct-frame access of SlotOperand.
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ Load const");
- JumpTarget exit;
- __ movq(rcx, SlotOperand(slot, rcx));
- __ CompareRoot(rcx, Heap::kTheHoleValueRootIndex);
- exit.Branch(not_equal);
- __ LoadRoot(rcx, Heap::kUndefinedValueRootIndex);
- exit.Bind();
- frame_->EmitPush(rcx);
-
- } else if (slot->type() == Slot::PARAMETER) {
- frame_->PushParameterAt(slot->index());
-
- } else if (slot->type() == Slot::LOCAL) {
- frame_->PushLocalAt(slot->index());
-
- } else {
- // The other remaining slot types (LOOKUP and GLOBAL) cannot reach
- // here.
- //
- // The use of SlotOperand below is safe for an unspilled frame
- // because it will always be a context slot.
- ASSERT(slot->type() == Slot::CONTEXT);
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- __ movq(temp.reg(), SlotOperand(slot, temp.reg()));
- frame_->Push(&temp);
- }
-}
-
-
-void CodeGenerator::LoadFromSlotCheckForArguments(Slot* slot,
- TypeofState state) {
- LoadFromSlot(slot, state);
-
- // Bail out quickly if we're not using lazy arguments allocation.
- if (ArgumentsMode() != LAZY_ARGUMENTS_ALLOCATION) return;
-
- // ... or if the slot isn't a non-parameter arguments slot.
- if (slot->type() == Slot::PARAMETER || !slot->is_arguments()) return;
-
- // Pop the loaded value from the stack.
- Result value = frame_->Pop();
-
- // If the loaded value is a constant, we know if the arguments
- // object has been lazily loaded yet.
- if (value.is_constant()) {
- if (value.handle()->IsArgumentsMarker()) {
- Result arguments = StoreArgumentsObject(false);
- frame_->Push(&arguments);
- } else {
- frame_->Push(&value);
- }
- return;
- }
-
- // The loaded value is in a register. If it is the sentinel that
- // indicates that we haven't loaded the arguments object yet, we
- // need to do it now.
- JumpTarget exit;
- __ CompareRoot(value.reg(), Heap::kArgumentsMarkerRootIndex);
- frame_->Push(&value);
- exit.Branch(not_equal);
- Result arguments = StoreArgumentsObject(false);
- frame_->SetElementAt(0, &arguments);
- exit.Bind();
-}
-
-
-Result CodeGenerator::LoadFromGlobalSlotCheckExtensions(
- Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow) {
- // Check that no extension objects have been created by calls to
- // eval from the current scope to the global scope.
- Register context = rsi;
- Result tmp = allocator_->Allocate();
- ASSERT(tmp.is_valid()); // All non-reserved registers were available.
-
- Scope* s = scope();
- while (s != NULL) {
- if (s->num_heap_slots() > 0) {
- if (s->calls_eval()) {
- // Check that extension is NULL.
- __ cmpq(ContextOperand(context, Context::EXTENSION_INDEX),
- Immediate(0));
- slow->Branch(not_equal, not_taken);
- }
- // Load next context in chain.
- __ movq(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX));
- __ movq(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
- context = tmp.reg();
- }
- // If no outer scope calls eval, we do not need to check more
- // context extensions. If we have reached an eval scope, we check
- // all extensions from this point.
- if (!s->outer_scope_calls_eval() || s->is_eval_scope()) break;
- s = s->outer_scope();
- }
-
- if (s->is_eval_scope()) {
- // Loop up the context chain. There is no frame effect so it is
- // safe to use raw labels here.
- Label next, fast;
- if (!context.is(tmp.reg())) {
- __ movq(tmp.reg(), context);
- }
- // Load map for comparison into register, outside loop.
- __ LoadRoot(kScratchRegister, Heap::kGlobalContextMapRootIndex);
- __ bind(&next);
- // Terminate at global context.
- __ cmpq(kScratchRegister, FieldOperand(tmp.reg(), HeapObject::kMapOffset));
- __ j(equal, &fast);
- // Check that extension is NULL.
- __ cmpq(ContextOperand(tmp.reg(), Context::EXTENSION_INDEX), Immediate(0));
- slow->Branch(not_equal);
- // Load next context in chain.
- __ movq(tmp.reg(), ContextOperand(tmp.reg(), Context::CLOSURE_INDEX));
- __ movq(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
- __ jmp(&next);
- __ bind(&fast);
- }
- tmp.Unuse();
-
- // All extension objects were empty and it is safe to use a global
- // load IC call.
- LoadGlobal();
- frame_->Push(slot->var()->name());
- RelocInfo::Mode mode = (typeof_state == INSIDE_TYPEOF)
- ? RelocInfo::CODE_TARGET
- : RelocInfo::CODE_TARGET_CONTEXT;
- Result answer = frame_->CallLoadIC(mode);
- // A test rax instruction following the call signals that the inobject
- // property case was inlined. Ensure that there is not a test rax
- // instruction here.
- masm_->nop();
- return answer;
-}
-
-
-void CodeGenerator::EmitDynamicLoadFromSlotFastCase(Slot* slot,
- TypeofState typeof_state,
- Result* result,
- JumpTarget* slow,
- JumpTarget* done) {
- // Generate fast-case code for variables that might be shadowed by
- // eval-introduced variables. Eval is used a lot without
- // introducing variables. In those cases, we do not want to
- // perform a runtime call for all variables in the scope
- // containing the eval.
- if (slot->var()->mode() == Variable::DYNAMIC_GLOBAL) {
- *result = LoadFromGlobalSlotCheckExtensions(slot, typeof_state, slow);
- done->Jump(result);
-
- } else if (slot->var()->mode() == Variable::DYNAMIC_LOCAL) {
- Slot* potential_slot = slot->var()->local_if_not_shadowed()->AsSlot();
- Expression* rewrite = slot->var()->local_if_not_shadowed()->rewrite();
- if (potential_slot != NULL) {
- // Generate fast case for locals that rewrite to slots.
- // Allocate a fresh register to use as a temp in
- // ContextSlotOperandCheckExtensions and to hold the result
- // value.
- *result = allocator_->Allocate();
- ASSERT(result->is_valid());
- __ movq(result->reg(),
- ContextSlotOperandCheckExtensions(potential_slot,
- *result,
- slow));
- if (potential_slot->var()->mode() == Variable::CONST) {
- __ CompareRoot(result->reg(), Heap::kTheHoleValueRootIndex);
- done->Branch(not_equal, result);
- __ LoadRoot(result->reg(), Heap::kUndefinedValueRootIndex);
- }
- done->Jump(result);
- } else if (rewrite != NULL) {
- // Generate fast case for argument loads.
- Property* property = rewrite->AsProperty();
- if (property != NULL) {
- VariableProxy* obj_proxy = property->obj()->AsVariableProxy();
- Literal* key_literal = property->key()->AsLiteral();
- if (obj_proxy != NULL &&
- key_literal != NULL &&
- obj_proxy->IsArguments() &&
- key_literal->handle()->IsSmi()) {
- // Load arguments object if there are no eval-introduced
- // variables. Then load the argument from the arguments
- // object using keyed load.
- Result arguments = allocator()->Allocate();
- ASSERT(arguments.is_valid());
- __ movq(arguments.reg(),
- ContextSlotOperandCheckExtensions(obj_proxy->var()->AsSlot(),
- arguments,
- slow));
- frame_->Push(&arguments);
- frame_->Push(key_literal->handle());
- *result = EmitKeyedLoad();
- done->Jump(result);
- }
- }
- }
- }
-}
-
-
-void CodeGenerator::StoreToSlot(Slot* slot, InitState init_state) {
- if (slot->type() == Slot::LOOKUP) {
- ASSERT(slot->var()->is_dynamic());
-
- // For now, just do a runtime call. Since the call is inevitable,
- // we eagerly sync the virtual frame so we can directly push the
- // arguments into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
-
- frame_->EmitPush(rsi);
- frame_->EmitPush(slot->var()->name());
-
- Result value;
- if (init_state == CONST_INIT) {
- // Same as the case for a normal store, but ignores attribute
- // (e.g. READ_ONLY) of context slot so that we can initialize const
- // properties (introduced via eval("const foo = (some expr);")). Also,
- // uses the current function context instead of the top context.
- //
- // Note that we must declare the foo upon entry of eval(), via a
- // context slot declaration, but we cannot initialize it at the same
- // time, because the const declaration may be at the end of the eval
- // code (sigh...) and the const variable may have been used before
- // (where its value is 'undefined'). Thus, we can only do the
- // initialization when we actually encounter the expression and when
- // the expression operands are defined and valid, and thus we need the
- // split into 2 operations: declaration of the context slot followed
- // by initialization.
- value = frame_->CallRuntime(Runtime::kInitializeConstContextSlot, 3);
- } else {
- frame_->Push(Smi::FromInt(strict_mode_flag()));
- value = frame_->CallRuntime(Runtime::kStoreContextSlot, 4);
- }
- // Storing a variable must keep the (new) value on the expression
- // stack. This is necessary for compiling chained assignment
- // expressions.
- frame_->Push(&value);
- } else {
- ASSERT(!slot->var()->is_dynamic());
-
- JumpTarget exit;
- if (init_state == CONST_INIT) {
- ASSERT(slot->var()->mode() == Variable::CONST);
- // Only the first const initialization must be executed (the slot
- // still contains 'the hole' value). When the assignment is executed,
- // the code is identical to a normal store (see below).
- //
- // We spill the frame in the code below because the direct-frame
- // access of SlotOperand is potentially unsafe with an unspilled
- // frame.
- VirtualFrame::SpilledScope spilled_scope;
- Comment cmnt(masm_, "[ Init const");
- __ movq(rcx, SlotOperand(slot, rcx));
- __ CompareRoot(rcx, Heap::kTheHoleValueRootIndex);
- exit.Branch(not_equal);
- }
-
- // We must execute the store. Storing a variable must keep the (new)
- // value on the stack. This is necessary for compiling assignment
- // expressions.
- //
- // Note: We will reach here even with slot->var()->mode() ==
- // Variable::CONST because of const declarations which will initialize
- // consts to 'the hole' value and by doing so, end up calling this code.
- if (slot->type() == Slot::PARAMETER) {
- frame_->StoreToParameterAt(slot->index());
- } else if (slot->type() == Slot::LOCAL) {
- frame_->StoreToLocalAt(slot->index());
- } else {
- // The other slot types (LOOKUP and GLOBAL) cannot reach here.
- //
- // The use of SlotOperand below is safe for an unspilled frame
- // because the slot is a context slot.
- ASSERT(slot->type() == Slot::CONTEXT);
- frame_->Dup();
- Result value = frame_->Pop();
- value.ToRegister();
- Result start = allocator_->Allocate();
- ASSERT(start.is_valid());
- __ movq(SlotOperand(slot, start.reg()), value.reg());
- // RecordWrite may destroy the value registers.
- //
- // TODO(204): Avoid actually spilling when the value is not
- // needed (probably the common case).
- frame_->Spill(value.reg());
- int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
- Result temp = allocator_->Allocate();
- ASSERT(temp.is_valid());
- __ RecordWrite(start.reg(), offset, value.reg(), temp.reg());
- // The results start, value, and temp are unused by going out of
- // scope.
- }
-
- exit.Bind();
- }
-}
-
-
-void CodeGenerator::VisitSlot(Slot* node) {
- Comment cmnt(masm_, "[ Slot");
- LoadFromSlotCheckForArguments(node, NOT_INSIDE_TYPEOF);
-}
-
-
-void CodeGenerator::VisitVariableProxy(VariableProxy* node) {
- Comment cmnt(masm_, "[ VariableProxy");
- Variable* var = node->var();
- Expression* expr = var->rewrite();
- if (expr != NULL) {
- Visit(expr);
- } else {
- ASSERT(var->is_global());
- Reference ref(this, node);
- ref.GetValue();
- }
-}
-
-
-void CodeGenerator::VisitLiteral(Literal* node) {
- Comment cmnt(masm_, "[ Literal");
- frame_->Push(node->handle());
-}
-
-
-void CodeGenerator::LoadUnsafeSmi(Register target, Handle<Object> value) {
- UNIMPLEMENTED();
- // TODO(X64): Implement security policy for loads of smis.
-}
-
-
-bool CodeGenerator::IsUnsafeSmi(Handle<Object> value) {
- return false;
-}
-
-
-// Materialize the regexp literal 'node' in the literals array
-// 'literals' of the function. Leave the regexp boilerplate in
-// 'boilerplate'.
-class DeferredRegExpLiteral: public DeferredCode {
- public:
- DeferredRegExpLiteral(Register boilerplate,
- Register literals,
- RegExpLiteral* node)
- : boilerplate_(boilerplate), literals_(literals), node_(node) {
- set_comment("[ DeferredRegExpLiteral");
- }
-
- void Generate();
-
- private:
- Register boilerplate_;
- Register literals_;
- RegExpLiteral* node_;
-};
-
-
-void DeferredRegExpLiteral::Generate() {
- // Since the entry is undefined we call the runtime system to
- // compute the literal.
- // Literal array (0).
- __ push(literals_);
- // Literal index (1).
- __ Push(Smi::FromInt(node_->literal_index()));
- // RegExp pattern (2).
- __ Push(node_->pattern());
- // RegExp flags (3).
- __ Push(node_->flags());
- __ CallRuntime(Runtime::kMaterializeRegExpLiteral, 4);
- if (!boilerplate_.is(rax)) __ movq(boilerplate_, rax);
-}
-
-
-class DeferredAllocateInNewSpace: public DeferredCode {
- public:
- DeferredAllocateInNewSpace(int size,
- Register target,
- int registers_to_save = 0)
- : size_(size), target_(target), registers_to_save_(registers_to_save) {
- ASSERT(size >= kPointerSize && size <= HEAP->MaxObjectSizeInNewSpace());
- set_comment("[ DeferredAllocateInNewSpace");
- }
- void Generate();
-
- private:
- int size_;
- Register target_;
- int registers_to_save_;
-};
-
-
-void DeferredAllocateInNewSpace::Generate() {
- for (int i = 0; i < kNumRegs; i++) {
- if (registers_to_save_ & (1 << i)) {
- Register save_register = { i };
- __ push(save_register);
- }
- }
- __ Push(Smi::FromInt(size_));
- __ CallRuntime(Runtime::kAllocateInNewSpace, 1);
- if (!target_.is(rax)) {
- __ movq(target_, rax);
- }
- for (int i = kNumRegs - 1; i >= 0; i--) {
- if (registers_to_save_ & (1 << i)) {
- Register save_register = { i };
- __ pop(save_register);
- }
- }
-}
-
-
-void CodeGenerator::VisitRegExpLiteral(RegExpLiteral* node) {
- Comment cmnt(masm_, "[ RegExp Literal");
-
- // Retrieve the literals array and check the allocated entry. Begin
- // with a writable copy of the function of this activation in a
- // register.
- frame_->PushFunction();
- Result literals = frame_->Pop();
- literals.ToRegister();
- frame_->Spill(literals.reg());
-
- // Load the literals array of the function.
- __ movq(literals.reg(),
- FieldOperand(literals.reg(), JSFunction::kLiteralsOffset));
-
- // Load the literal at the ast saved index.
- Result boilerplate = allocator_->Allocate();
- ASSERT(boilerplate.is_valid());
- int literal_offset =
- FixedArray::kHeaderSize + node->literal_index() * kPointerSize;
- __ movq(boilerplate.reg(), FieldOperand(literals.reg(), literal_offset));
-
- // Check whether we need to materialize the RegExp object. If so,
- // jump to the deferred code passing the literals array.
- DeferredRegExpLiteral* deferred =
- new DeferredRegExpLiteral(boilerplate.reg(), literals.reg(), node);
- __ CompareRoot(boilerplate.reg(), Heap::kUndefinedValueRootIndex);
- deferred->Branch(equal);
- deferred->BindExit();
-
- // Register of boilerplate contains RegExp object.
-
- Result tmp = allocator()->Allocate();
- ASSERT(tmp.is_valid());
-
- int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
-
- DeferredAllocateInNewSpace* allocate_fallback =
- new DeferredAllocateInNewSpace(size, literals.reg());
- frame_->Push(&boilerplate);
- frame_->SpillTop();
- __ AllocateInNewSpace(size,
- literals.reg(),
- tmp.reg(),
- no_reg,
- allocate_fallback->entry_label(),
- TAG_OBJECT);
- allocate_fallback->BindExit();
- boilerplate = frame_->Pop();
- // Copy from boilerplate to clone and return clone.
-
- for (int i = 0; i < size; i += kPointerSize) {
- __ movq(tmp.reg(), FieldOperand(boilerplate.reg(), i));
- __ movq(FieldOperand(literals.reg(), i), tmp.reg());
- }
- frame_->Push(&literals);
-}
-
-
-void CodeGenerator::VisitObjectLiteral(ObjectLiteral* node) {
- Comment cmnt(masm_, "[ ObjectLiteral");
-
- // Load a writable copy of the function of this activation in a
- // register.
- frame_->PushFunction();
- Result literals = frame_->Pop();
- literals.ToRegister();
- frame_->Spill(literals.reg());
-
- // Load the literals array of the function.
- __ movq(literals.reg(),
- FieldOperand(literals.reg(), JSFunction::kLiteralsOffset));
- // Literal array.
- frame_->Push(&literals);
- // Literal index.
- frame_->Push(Smi::FromInt(node->literal_index()));
- // Constant properties.
- frame_->Push(node->constant_properties());
- // Should the object literal have fast elements?
- frame_->Push(Smi::FromInt(node->fast_elements() ? 1 : 0));
- Result clone;
- if (node->depth() > 1) {
- clone = frame_->CallRuntime(Runtime::kCreateObjectLiteral, 4);
- } else {
- clone = frame_->CallRuntime(Runtime::kCreateObjectLiteralShallow, 4);
- }
- frame_->Push(&clone);
-
- // Mark all computed expressions that are bound to a key that
- // is shadowed by a later occurrence of the same key. For the
- // marked expressions, no store code is emitted.
- node->CalculateEmitStore();
-
- for (int i = 0; i < node->properties()->length(); i++) {
- ObjectLiteral::Property* property = node->properties()->at(i);
- switch (property->kind()) {
- case ObjectLiteral::Property::CONSTANT:
- break;
- case ObjectLiteral::Property::MATERIALIZED_LITERAL:
- if (CompileTimeValue::IsCompileTimeValue(property->value())) break;
- // else fall through.
- case ObjectLiteral::Property::COMPUTED: {
- Handle<Object> key(property->key()->handle());
- if (key->IsSymbol()) {
- // Duplicate the object as the IC receiver.
- frame_->Dup();
- Load(property->value());
- if (property->emit_store()) {
- Result ignored =
- frame_->CallStoreIC(Handle<String>::cast(key), false,
- strict_mode_flag());
- // A test rax instruction following the store IC call would
- // indicate the presence of an inlined version of the
- // store. Add a nop to indicate that there is no such
- // inlined version.
- __ nop();
- } else {
- frame_->Drop(2);
- }
- break;
- }
- // Fall through
- }
- case ObjectLiteral::Property::PROTOTYPE: {
- // Duplicate the object as an argument to the runtime call.
- frame_->Dup();
- Load(property->key());
- Load(property->value());
- if (property->emit_store()) {
- frame_->Push(Smi::FromInt(NONE)); // PropertyAttributes
- // Ignore the result.
- Result ignored = frame_->CallRuntime(Runtime::kSetProperty, 4);
- } else {
- frame_->Drop(3);
- }
- break;
- }
- case ObjectLiteral::Property::SETTER: {
- // Duplicate the object as an argument to the runtime call.
- frame_->Dup();
- Load(property->key());
- frame_->Push(Smi::FromInt(1));
- Load(property->value());
- Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4);
- // Ignore the result.
- break;
- }
- case ObjectLiteral::Property::GETTER: {
- // Duplicate the object as an argument to the runtime call.
- frame_->Dup();
- Load(property->key());
- frame_->Push(Smi::FromInt(0));
- Load(property->value());
- Result ignored = frame_->CallRuntime(Runtime::kDefineAccessor, 4);
- // Ignore the result.
- break;
- }
- default: UNREACHABLE();
- }
- }
-}
-
-
-void CodeGenerator::VisitArrayLiteral(ArrayLiteral* node) {
- Comment cmnt(masm_, "[ ArrayLiteral");
-
- // Load a writable copy of the function of this activation in a
- // register.
- frame_->PushFunction();
- Result literals = frame_->Pop();
- literals.ToRegister();
- frame_->Spill(literals.reg());
-
- // Load the literals array of the function.
- __ movq(literals.reg(),
- FieldOperand(literals.reg(), JSFunction::kLiteralsOffset));
-
- frame_->Push(&literals);
- frame_->Push(Smi::FromInt(node->literal_index()));
- frame_->Push(node->constant_elements());
- int length = node->values()->length();
- Result clone;
- if (node->constant_elements()->map() == HEAP->fixed_cow_array_map()) {
- FastCloneShallowArrayStub stub(
- FastCloneShallowArrayStub::COPY_ON_WRITE_ELEMENTS, length);
- clone = frame_->CallStub(&stub, 3);
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->cow_arrays_created_stub(), 1);
- } else if (node->depth() > 1) {
- clone = frame_->CallRuntime(Runtime::kCreateArrayLiteral, 3);
- } else if (length > FastCloneShallowArrayStub::kMaximumClonedLength) {
- clone = frame_->CallRuntime(Runtime::kCreateArrayLiteralShallow, 3);
- } else {
- FastCloneShallowArrayStub stub(
- FastCloneShallowArrayStub::CLONE_ELEMENTS, length);
- clone = frame_->CallStub(&stub, 3);
- }
- frame_->Push(&clone);
-
- // Generate code to set the elements in the array that are not
- // literals.
- for (int i = 0; i < length; i++) {
- Expression* value = node->values()->at(i);
-
- if (!CompileTimeValue::ArrayLiteralElementNeedsInitialization(value)) {
- continue;
- }
-
- // The property must be set by generated code.
- Load(value);
-
- // Get the property value off the stack.
- Result prop_value = frame_->Pop();
- prop_value.ToRegister();
-
- // Fetch the array literal while leaving a copy on the stack and
- // use it to get the elements array.
- frame_->Dup();
- Result elements = frame_->Pop();
- elements.ToRegister();
- frame_->Spill(elements.reg());
- // Get the elements FixedArray.
- __ movq(elements.reg(),
- FieldOperand(elements.reg(), JSObject::kElementsOffset));
-
- // Write to the indexed properties array.
- int offset = i * kPointerSize + FixedArray::kHeaderSize;
- __ movq(FieldOperand(elements.reg(), offset), prop_value.reg());
-
- // Update the write barrier for the array address.
- frame_->Spill(prop_value.reg()); // Overwritten by the write barrier.
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_valid());
- __ RecordWrite(elements.reg(), offset, prop_value.reg(), scratch.reg());
- }
-}
-
-
-void CodeGenerator::VisitCatchExtensionObject(CatchExtensionObject* node) {
- ASSERT(!in_spilled_code());
- // Call runtime routine to allocate the catch extension object and
- // assign the exception value to the catch variable.
- Comment cmnt(masm_, "[ CatchExtensionObject");
- Load(node->key());
- Load(node->value());
- Result result =
- frame_->CallRuntime(Runtime::kCreateCatchExtensionObject, 2);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::EmitSlotAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Comment cmnt(masm(), "[ Variable Assignment");
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- ASSERT(var != NULL);
- Slot* slot = var->AsSlot();
- ASSERT(slot != NULL);
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
- Load(node->value());
-
- // Perform the binary operation.
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- // Construct the implicit binary operation.
- BinaryOperation expr(node);
- GenericBinaryOperation(&expr,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Perform the assignment.
- if (var->mode() != Variable::CONST || node->op() == Token::INIT_CONST) {
- CodeForSourcePosition(node->position());
- StoreToSlot(slot,
- node->op() == Token::INIT_CONST ? CONST_INIT : NOT_CONST_INIT);
- }
- ASSERT(frame()->height() == original_height + 1);
-}
-
-
-void CodeGenerator::EmitNamedPropertyAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Comment cmnt(masm(), "[ Named Property Assignment");
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- Property* prop = node->target()->AsProperty();
- ASSERT(var == NULL || (prop == NULL && var->is_global()));
-
- // Initialize name and evaluate the receiver sub-expression if necessary. If
- // the receiver is trivial it is not placed on the stack at this point, but
- // loaded whenever actually needed.
- Handle<String> name;
- bool is_trivial_receiver = false;
- if (var != NULL) {
- name = var->name();
- } else {
- Literal* lit = prop->key()->AsLiteral();
- ASSERT_NOT_NULL(lit);
- name = Handle<String>::cast(lit->handle());
- // Do not materialize the receiver on the frame if it is trivial.
- is_trivial_receiver = prop->obj()->IsTrivial();
- if (!is_trivial_receiver) Load(prop->obj());
- }
-
- // Change to slow case in the beginning of an initialization block to
- // avoid the quadratic behavior of repeatedly adding fast properties.
- if (node->starts_initialization_block()) {
- // Initialization block consists of assignments of the form expr.x = ..., so
- // this will never be an assignment to a variable, so there must be a
- // receiver object.
- ASSERT_EQ(NULL, var);
- if (is_trivial_receiver) {
- frame()->Push(prop->obj());
- } else {
- frame()->Dup();
- }
- Result ignored = frame()->CallRuntime(Runtime::kToSlowProperties, 1);
- }
-
- // Change to fast case at the end of an initialization block. To prepare for
- // that add an extra copy of the receiver to the frame, so that it can be
- // converted back to fast case after the assignment.
- if (node->ends_initialization_block() && !is_trivial_receiver) {
- frame()->Dup();
- }
-
- // Stack layout:
- // [tos] : receiver (only materialized if non-trivial)
- // [tos+1] : receiver if at the end of an initialization block
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- if (is_trivial_receiver) {
- frame()->Push(prop->obj());
- } else if (var != NULL) {
- // The LoadIC stub expects the object in rax.
- // Freeing rax causes the code generator to load the global into it.
- frame_->Spill(rax);
- LoadGlobal();
- } else {
- frame()->Dup();
- }
- Result value = EmitNamedLoad(name, var != NULL);
- frame()->Push(&value);
- Load(node->value());
-
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- // Construct the implicit binary operation.
- BinaryOperation expr(node);
- GenericBinaryOperation(&expr,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Stack layout:
- // [tos] : value
- // [tos+1] : receiver (only materialized if non-trivial)
- // [tos+2] : receiver if at the end of an initialization block
-
- // Perform the assignment. It is safe to ignore constants here.
- ASSERT(var == NULL || var->mode() != Variable::CONST);
- ASSERT_NE(Token::INIT_CONST, node->op());
- if (is_trivial_receiver) {
- Result value = frame()->Pop();
- frame()->Push(prop->obj());
- frame()->Push(&value);
- }
- CodeForSourcePosition(node->position());
- bool is_contextual = (var != NULL);
- Result answer = EmitNamedStore(name, is_contextual);
- frame()->Push(&answer);
-
- // Stack layout:
- // [tos] : result
- // [tos+1] : receiver if at the end of an initialization block
-
- if (node->ends_initialization_block()) {
- ASSERT_EQ(NULL, var);
- // The argument to the runtime call is the receiver.
- if (is_trivial_receiver) {
- frame()->Push(prop->obj());
- } else {
- // A copy of the receiver is below the value of the assignment. Swap
- // the receiver and the value of the assignment expression.
- Result result = frame()->Pop();
- Result receiver = frame()->Pop();
- frame()->Push(&result);
- frame()->Push(&receiver);
- }
- Result ignored = frame_->CallRuntime(Runtime::kToFastProperties, 1);
- }
-
- // Stack layout:
- // [tos] : result
-
- ASSERT_EQ(frame()->height(), original_height + 1);
-}
-
-
-void CodeGenerator::EmitKeyedPropertyAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Comment cmnt(masm_, "[ Keyed Property Assignment");
- Property* prop = node->target()->AsProperty();
- ASSERT_NOT_NULL(prop);
-
- // Evaluate the receiver subexpression.
- Load(prop->obj());
-
- // Change to slow case in the beginning of an initialization block to
- // avoid the quadratic behavior of repeatedly adding fast properties.
- if (node->starts_initialization_block()) {
- frame_->Dup();
- Result ignored = frame_->CallRuntime(Runtime::kToSlowProperties, 1);
- }
-
- // Change to fast case at the end of an initialization block. To prepare for
- // that add an extra copy of the receiver to the frame, so that it can be
- // converted back to fast case after the assignment.
- if (node->ends_initialization_block()) {
- frame_->Dup();
- }
-
- // Evaluate the key subexpression.
- Load(prop->key());
-
- // Stack layout:
- // [tos] : key
- // [tos+1] : receiver
- // [tos+2] : receiver if at the end of an initialization block
-
- // Evaluate the right-hand side.
- if (node->is_compound()) {
- // For a compound assignment the right-hand side is a binary operation
- // between the current property value and the actual right-hand side.
- // Duplicate receiver and key for loading the current property value.
- frame()->PushElementAt(1);
- frame()->PushElementAt(1);
- Result value = EmitKeyedLoad();
- frame()->Push(&value);
- Load(node->value());
-
- // Perform the binary operation.
- bool overwrite_value = node->value()->ResultOverwriteAllowed();
- BinaryOperation expr(node);
- GenericBinaryOperation(&expr,
- overwrite_value ? OVERWRITE_RIGHT : NO_OVERWRITE);
- } else {
- // For non-compound assignment just load the right-hand side.
- Load(node->value());
- }
-
- // Stack layout:
- // [tos] : value
- // [tos+1] : key
- // [tos+2] : receiver
- // [tos+3] : receiver if at the end of an initialization block
-
- // Perform the assignment. It is safe to ignore constants here.
- ASSERT(node->op() != Token::INIT_CONST);
- CodeForSourcePosition(node->position());
- Result answer = EmitKeyedStore(prop->key()->type());
- frame()->Push(&answer);
-
- // Stack layout:
- // [tos] : result
- // [tos+1] : receiver if at the end of an initialization block
-
- // Change to fast case at the end of an initialization block.
- if (node->ends_initialization_block()) {
- // The argument to the runtime call is the extra copy of the receiver,
- // which is below the value of the assignment. Swap the receiver and
- // the value of the assignment expression.
- Result result = frame()->Pop();
- Result receiver = frame()->Pop();
- frame()->Push(&result);
- frame()->Push(&receiver);
- Result ignored = frame_->CallRuntime(Runtime::kToFastProperties, 1);
- }
-
- // Stack layout:
- // [tos] : result
-
- ASSERT(frame()->height() == original_height + 1);
-}
-
-
-void CodeGenerator::VisitAssignment(Assignment* node) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Variable* var = node->target()->AsVariableProxy()->AsVariable();
- Property* prop = node->target()->AsProperty();
-
- if (var != NULL && !var->is_global()) {
- EmitSlotAssignment(node);
-
- } else if ((prop != NULL && prop->key()->IsPropertyName()) ||
- (var != NULL && var->is_global())) {
- // Properties whose keys are property names and global variables are
- // treated as named property references. We do not need to consider
- // global 'this' because it is not a valid left-hand side.
- EmitNamedPropertyAssignment(node);
-
- } else if (prop != NULL) {
- // Other properties (including rewritten parameters for a function that
- // uses arguments) are keyed property assignments.
- EmitKeyedPropertyAssignment(node);
-
- } else {
- // Invalid left-hand side.
- Load(node->target());
- Result result = frame()->CallRuntime(Runtime::kThrowReferenceError, 1);
- // The runtime call doesn't actually return but the code generator will
- // still generate code and expects a certain frame height.
- frame()->Push(&result);
- }
-
- ASSERT(frame()->height() == original_height + 1);
-}
-
-
-void CodeGenerator::VisitThrow(Throw* node) {
- Comment cmnt(masm_, "[ Throw");
- Load(node->exception());
- Result result = frame_->CallRuntime(Runtime::kThrow, 1);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::VisitProperty(Property* node) {
- Comment cmnt(masm_, "[ Property");
- Reference property(this, node);
- property.GetValue();
-}
-
-
-void CodeGenerator::VisitCall(Call* node) {
- Comment cmnt(masm_, "[ Call");
-
- ZoneList<Expression*>* args = node->arguments();
-
- // Check if the function is a variable or a property.
- Expression* function = node->expression();
- Variable* var = function->AsVariableProxy()->AsVariable();
- Property* property = function->AsProperty();
-
- // ------------------------------------------------------------------------
- // Fast-case: Use inline caching.
- // ---
- // According to ECMA-262, section 11.2.3, page 44, the function to call
- // must be resolved after the arguments have been evaluated. The IC code
- // automatically handles this by loading the arguments before the function
- // is resolved in cache misses (this also holds for megamorphic calls).
- // ------------------------------------------------------------------------
-
- if (var != NULL && var->is_possibly_eval()) {
- // ----------------------------------
- // JavaScript example: 'eval(arg)' // eval is not known to be shadowed
- // ----------------------------------
-
- // In a call to eval, we first call %ResolvePossiblyDirectEval to
- // resolve the function we need to call and the receiver of the
- // call. Then we call the resolved function using the given
- // arguments.
-
- // Prepare the stack for the call to the resolved function.
- Load(function);
-
- // Allocate a frame slot for the receiver.
- frame_->Push(FACTORY->undefined_value());
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Result to hold the result of the function resolution and the
- // final result of the eval call.
- Result result;
-
- // If we know that eval can only be shadowed by eval-introduced
- // variables we attempt to load the global eval function directly
- // in generated code. If we succeed, there is no need to perform a
- // context lookup in the runtime system.
- JumpTarget done;
- if (var->AsSlot() != NULL && var->mode() == Variable::DYNAMIC_GLOBAL) {
- ASSERT(var->AsSlot()->type() == Slot::LOOKUP);
- JumpTarget slow;
- // Prepare the stack for the call to
- // ResolvePossiblyDirectEvalNoLookup by pushing the loaded
- // function, the first argument to the eval call and the
- // receiver.
- Result fun = LoadFromGlobalSlotCheckExtensions(var->AsSlot(),
- NOT_INSIDE_TYPEOF,
- &slow);
- frame_->Push(&fun);
- if (arg_count > 0) {
- frame_->PushElementAt(arg_count);
- } else {
- frame_->Push(FACTORY->undefined_value());
- }
- frame_->PushParameterAt(-1);
-
- // Push the strict mode flag.
- frame_->Push(Smi::FromInt(strict_mode_flag()));
-
- // Resolve the call.
- result =
- frame_->CallRuntime(Runtime::kResolvePossiblyDirectEvalNoLookup, 4);
-
- done.Jump(&result);
- slow.Bind();
- }
-
- // Prepare the stack for the call to ResolvePossiblyDirectEval by
- // pushing the loaded function, the first argument to the eval
- // call and the receiver.
- frame_->PushElementAt(arg_count + 1);
- if (arg_count > 0) {
- frame_->PushElementAt(arg_count);
- } else {
- frame_->Push(FACTORY->undefined_value());
- }
- frame_->PushParameterAt(-1);
-
- // Push the strict mode flag.
- frame_->Push(Smi::FromInt(strict_mode_flag()));
-
- // Resolve the call.
- result = frame_->CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
-
- // If we generated fast-case code bind the jump-target where fast
- // and slow case merge.
- if (done.is_linked()) done.Bind(&result);
-
- // The runtime call returns a pair of values in rax (function) and
- // rdx (receiver). Touch up the stack with the right values.
- Result receiver = allocator_->Allocate(rdx);
- frame_->SetElementAt(arg_count + 1, &result);
- frame_->SetElementAt(arg_count, &receiver);
- receiver.Unuse();
-
- // Call the function.
- CodeForSourcePosition(node->position());
- InLoopFlag in_loop = loop_nesting() > 0 ? IN_LOOP : NOT_IN_LOOP;
- CallFunctionStub call_function(arg_count, in_loop, RECEIVER_MIGHT_BE_VALUE);
- result = frame_->CallStub(&call_function, arg_count + 1);
-
- // Restore the context and overwrite the function on the stack with
- // the result.
- frame_->RestoreContextRegister();
- frame_->SetElementAt(0, &result);
-
- } else if (var != NULL && !var->is_this() && var->is_global()) {
- // ----------------------------------
- // JavaScript example: 'foo(1, 2, 3)' // foo is global
- // ----------------------------------
-
- // Pass the global object as the receiver and let the IC stub
- // patch the stack to use the global proxy as 'this' in the
- // invoked function.
- LoadGlobal();
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Push the name of the function on the frame.
- frame_->Push(var->name());
-
- // Call the IC initialization code.
- CodeForSourcePosition(node->position());
- Result result = frame_->CallCallIC(RelocInfo::CODE_TARGET_CONTEXT,
- arg_count,
- loop_nesting());
- frame_->RestoreContextRegister();
- // Replace the function on the stack with the result.
- frame_->Push(&result);
-
- } else if (var != NULL && var->AsSlot() != NULL &&
- var->AsSlot()->type() == Slot::LOOKUP) {
- // ----------------------------------
- // JavaScript examples:
- //
- // with (obj) foo(1, 2, 3) // foo may be in obj.
- //
- // function f() {};
- // function g() {
- // eval(...);
- // f(); // f could be in extension object.
- // }
- // ----------------------------------
-
- JumpTarget slow, done;
- Result function;
-
- // Generate fast case for loading functions from slots that
- // correspond to local/global variables or arguments unless they
- // are shadowed by eval-introduced bindings.
- EmitDynamicLoadFromSlotFastCase(var->AsSlot(),
- NOT_INSIDE_TYPEOF,
- &function,
- &slow,
- &done);
-
- slow.Bind();
- // Load the function from the context. Sync the frame so we can
- // push the arguments directly into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(rsi);
- frame_->EmitPush(var->name());
- frame_->CallRuntime(Runtime::kLoadContextSlot, 2);
- // The runtime call returns a pair of values in rax and rdx. The
- // looked-up function is in rax and the receiver is in rdx. These
- // register references are not ref counted here. We spill them
- // eagerly since they are arguments to an inevitable call (and are
- // not sharable by the arguments).
- ASSERT(!allocator()->is_used(rax));
- frame_->EmitPush(rax);
-
- // Load the receiver.
- ASSERT(!allocator()->is_used(rdx));
- frame_->EmitPush(rdx);
-
- // If fast case code has been generated, emit code to push the
- // function and receiver and have the slow path jump around this
- // code.
- if (done.is_linked()) {
- JumpTarget call;
- call.Jump();
- done.Bind(&function);
- frame_->Push(&function);
- LoadGlobalReceiver();
- call.Bind();
- }
-
- // Call the function.
- CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position());
-
- } else if (property != NULL) {
- // Check if the key is a literal string.
- Literal* literal = property->key()->AsLiteral();
-
- if (literal != NULL && literal->handle()->IsSymbol()) {
- // ------------------------------------------------------------------
- // JavaScript example: 'object.foo(1, 2, 3)' or 'map["key"](1, 2, 3)'
- // ------------------------------------------------------------------
-
- Handle<String> name = Handle<String>::cast(literal->handle());
-
- if (ArgumentsMode() == LAZY_ARGUMENTS_ALLOCATION &&
- name->IsEqualTo(CStrVector("apply")) &&
- args->length() == 2 &&
- args->at(1)->AsVariableProxy() != NULL &&
- args->at(1)->AsVariableProxy()->IsArguments()) {
- // Use the optimized Function.prototype.apply that avoids
- // allocating lazily allocated arguments objects.
- CallApplyLazy(property->obj(),
- args->at(0),
- args->at(1)->AsVariableProxy(),
- node->position());
-
- } else {
- // Push the receiver onto the frame.
- Load(property->obj());
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Push the name of the function onto the frame.
- frame_->Push(name);
-
- // Call the IC initialization code.
- CodeForSourcePosition(node->position());
- Result result = frame_->CallCallIC(RelocInfo::CODE_TARGET,
- arg_count,
- loop_nesting());
- frame_->RestoreContextRegister();
- frame_->Push(&result);
- }
-
- } else {
- // -------------------------------------------
- // JavaScript example: 'array[index](1, 2, 3)'
- // -------------------------------------------
-
- // Load the function to call from the property through a reference.
- if (property->is_synthetic()) {
- Reference ref(this, property, false);
- ref.GetValue();
- // Use global object as receiver.
- LoadGlobalReceiver();
- // Call the function.
- CallWithArguments(args, RECEIVER_MIGHT_BE_VALUE, node->position());
- } else {
- // Push the receiver onto the frame.
- Load(property->obj());
-
- // Load the name of the function.
- Load(property->key());
-
- // Swap the name of the function and the receiver on the stack to follow
- // the calling convention for call ICs.
- Result key = frame_->Pop();
- Result receiver = frame_->Pop();
- frame_->Push(&key);
- frame_->Push(&receiver);
- key.Unuse();
- receiver.Unuse();
-
- // Load the arguments.
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- frame_->SpillTop();
- }
-
- // Place the key on top of stack and call the IC initialization code.
- frame_->PushElementAt(arg_count + 1);
- CodeForSourcePosition(node->position());
- Result result = frame_->CallKeyedCallIC(RelocInfo::CODE_TARGET,
- arg_count,
- loop_nesting());
- frame_->Drop(); // Drop the key still on the stack.
- frame_->RestoreContextRegister();
- frame_->Push(&result);
- }
- }
- } else {
- // ----------------------------------
- // JavaScript example: 'foo(1, 2, 3)' // foo is not global
- // ----------------------------------
-
- // Load the function.
- Load(function);
-
- // Pass the global proxy as the receiver.
- LoadGlobalReceiver();
-
- // Call the function.
- CallWithArguments(args, NO_CALL_FUNCTION_FLAGS, node->position());
- }
-}
-
-
-void CodeGenerator::VisitCallNew(CallNew* node) {
- Comment cmnt(masm_, "[ CallNew");
-
- // According to ECMA-262, section 11.2.2, page 44, the function
- // expression in new calls must be evaluated before the
- // arguments. This is different from ordinary calls, where the
- // actual function to call is resolved after the arguments have been
- // evaluated.
-
- // Push constructor on the stack. If it's not a function it's used as
- // receiver for CALL_NON_FUNCTION, otherwise the value on the stack is
- // ignored.
- Load(node->expression());
-
- // Push the arguments ("left-to-right") on the stack.
- ZoneList<Expression*>* args = node->arguments();
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- // Call the construct call builtin that handles allocation and
- // constructor invocation.
- CodeForSourcePosition(node->position());
- Result result = frame_->CallConstructor(arg_count);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateIsSmi(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- Condition is_smi = masm_->CheckSmi(value.reg());
- value.Unuse();
- destination()->Split(is_smi);
-}
-
-
-void CodeGenerator::GenerateLog(ZoneList<Expression*>* args) {
- // Conditionally generate a log call.
- // Args:
- // 0 (literal string): The type of logging (corresponds to the flags).
- // This is used to determine whether or not to generate the log call.
- // 1 (string): Format string. Access the string at argument index 2
- // with '%2s' (see Logger::LogRuntime for all the formats).
- // 2 (array): Arguments to the format string.
- ASSERT_EQ(args->length(), 3);
-#ifdef ENABLE_LOGGING_AND_PROFILING
- if (ShouldGenerateLog(args->at(0))) {
- Load(args->at(1));
- Load(args->at(2));
- frame_->CallRuntime(Runtime::kLog, 2);
- }
-#endif
- // Finally, we're expected to leave a value on the top of the stack.
- frame_->Push(FACTORY->undefined_value());
-}
-
-
-void CodeGenerator::GenerateIsNonNegativeSmi(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- Condition non_negative_smi = masm_->CheckNonNegativeSmi(value.reg());
- value.Unuse();
- destination()->Split(non_negative_smi);
-}
-
-
-class DeferredStringCharCodeAt : public DeferredCode {
- public:
- DeferredStringCharCodeAt(Register object,
- Register index,
- Register scratch,
- Register result)
- : result_(result),
- char_code_at_generator_(object,
- index,
- scratch,
- result,
- &need_conversion_,
- &need_conversion_,
- &index_out_of_range_,
- STRING_INDEX_IS_NUMBER) {}
-
- StringCharCodeAtGenerator* fast_case_generator() {
- return &char_code_at_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_code_at_generator_.GenerateSlow(masm(), call_helper);
-
- __ bind(&need_conversion_);
- // Move the undefined value into the result register, which will
- // trigger conversion.
- __ LoadRoot(result_, Heap::kUndefinedValueRootIndex);
- __ jmp(exit_label());
-
- __ bind(&index_out_of_range_);
- // When the index is out of range, the spec requires us to return
- // NaN.
- __ LoadRoot(result_, Heap::kNanValueRootIndex);
- __ jmp(exit_label());
- }
-
- private:
- Register result_;
-
- Label need_conversion_;
- Label index_out_of_range_;
-
- StringCharCodeAtGenerator char_code_at_generator_;
-};
-
-
-// This generates code that performs a String.prototype.charCodeAt() call
-// or returns a smi in order to trigger conversion.
-void CodeGenerator::GenerateStringCharCodeAt(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharCodeAt");
- ASSERT(args->length() == 2);
-
- Load(args->at(0));
- Load(args->at(1));
- Result index = frame_->Pop();
- Result object = frame_->Pop();
- object.ToRegister();
- index.ToRegister();
- // We might mutate the object register.
- frame_->Spill(object.reg());
-
- // We need two extra registers.
- Result result = allocator()->Allocate();
- ASSERT(result.is_valid());
- Result scratch = allocator()->Allocate();
- ASSERT(scratch.is_valid());
-
- DeferredStringCharCodeAt* deferred =
- new DeferredStringCharCodeAt(object.reg(),
- index.reg(),
- scratch.reg(),
- result.reg());
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->Push(&result);
-}
-
-
-class DeferredStringCharFromCode : public DeferredCode {
- public:
- DeferredStringCharFromCode(Register code,
- Register result)
- : char_from_code_generator_(code, result) {}
-
- StringCharFromCodeGenerator* fast_case_generator() {
- return &char_from_code_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_from_code_generator_.GenerateSlow(masm(), call_helper);
- }
-
- private:
- StringCharFromCodeGenerator char_from_code_generator_;
-};
-
-
-// Generates code for creating a one-char string from a char code.
-void CodeGenerator::GenerateStringCharFromCode(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharFromCode");
- ASSERT(args->length() == 1);
-
- Load(args->at(0));
-
- Result code = frame_->Pop();
- code.ToRegister();
- ASSERT(code.is_valid());
-
- Result result = allocator()->Allocate();
- ASSERT(result.is_valid());
-
- DeferredStringCharFromCode* deferred = new DeferredStringCharFromCode(
- code.reg(), result.reg());
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->Push(&result);
-}
-
-
-class DeferredStringCharAt : public DeferredCode {
- public:
- DeferredStringCharAt(Register object,
- Register index,
- Register scratch1,
- Register scratch2,
- Register result)
- : result_(result),
- char_at_generator_(object,
- index,
- scratch1,
- scratch2,
- result,
- &need_conversion_,
- &need_conversion_,
- &index_out_of_range_,
- STRING_INDEX_IS_NUMBER) {}
-
- StringCharAtGenerator* fast_case_generator() {
- return &char_at_generator_;
- }
-
- virtual void Generate() {
- VirtualFrameRuntimeCallHelper call_helper(frame_state());
- char_at_generator_.GenerateSlow(masm(), call_helper);
-
- __ bind(&need_conversion_);
- // Move smi zero into the result register, which will trigger
- // conversion.
- __ Move(result_, Smi::FromInt(0));
- __ jmp(exit_label());
-
- __ bind(&index_out_of_range_);
- // When the index is out of range, the spec requires us to return
- // the empty string.
- __ LoadRoot(result_, Heap::kEmptyStringRootIndex);
- __ jmp(exit_label());
- }
-
- private:
- Register result_;
-
- Label need_conversion_;
- Label index_out_of_range_;
-
- StringCharAtGenerator char_at_generator_;
-};
-
-
-// This generates code that performs a String.prototype.charAt() call
-// or returns a smi in order to trigger conversion.
-void CodeGenerator::GenerateStringCharAt(ZoneList<Expression*>* args) {
- Comment(masm_, "[ GenerateStringCharAt");
- ASSERT(args->length() == 2);
-
- Load(args->at(0));
- Load(args->at(1));
- Result index = frame_->Pop();
- Result object = frame_->Pop();
- object.ToRegister();
- index.ToRegister();
- // We might mutate the object register.
- frame_->Spill(object.reg());
-
- // We need three extra registers.
- Result result = allocator()->Allocate();
- ASSERT(result.is_valid());
- Result scratch1 = allocator()->Allocate();
- ASSERT(scratch1.is_valid());
- Result scratch2 = allocator()->Allocate();
- ASSERT(scratch2.is_valid());
-
- DeferredStringCharAt* deferred =
- new DeferredStringCharAt(object.reg(),
- index.reg(),
- scratch1.reg(),
- scratch2.reg(),
- result.reg());
- deferred->fast_case_generator()->GenerateFast(masm_);
- deferred->BindExit();
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- Condition is_smi = masm_->CheckSmi(value.reg());
- destination()->false_target()->Branch(is_smi);
- // It is a heap object - get map.
- // Check if the object is a JS array or not.
- __ CmpObjectType(value.reg(), JS_ARRAY_TYPE, kScratchRegister);
- value.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateIsRegExp(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- Condition is_smi = masm_->CheckSmi(value.reg());
- destination()->false_target()->Branch(is_smi);
- // It is a heap object - get map.
- // Check if the object is a regexp.
- __ CmpObjectType(value.reg(), JS_REGEXP_TYPE, kScratchRegister);
- value.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp')
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop();
- obj.ToRegister();
- Condition is_smi = masm_->CheckSmi(obj.reg());
- destination()->false_target()->Branch(is_smi);
-
- __ Move(kScratchRegister, FACTORY->null_value());
- __ cmpq(obj.reg(), kScratchRegister);
- destination()->true_target()->Branch(equal);
-
- __ movq(kScratchRegister, FieldOperand(obj.reg(), HeapObject::kMapOffset));
- // Undetectable objects behave like undefined when tested with typeof.
- __ testb(FieldOperand(kScratchRegister, Map::kBitFieldOffset),
- Immediate(1 << Map::kIsUndetectable));
- destination()->false_target()->Branch(not_zero);
- __ movzxbq(kScratchRegister,
- FieldOperand(kScratchRegister, Map::kInstanceTypeOffset));
- __ cmpq(kScratchRegister, Immediate(FIRST_JS_OBJECT_TYPE));
- destination()->false_target()->Branch(below);
- __ cmpq(kScratchRegister, Immediate(LAST_JS_OBJECT_TYPE));
- obj.Unuse();
- destination()->Split(below_equal);
-}
-
-
-void CodeGenerator::GenerateIsSpecObject(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp' ||
- // typeof(arg) == function).
- // It includes undetectable objects (as opposed to IsObject).
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- Condition is_smi = masm_->CheckSmi(value.reg());
- destination()->false_target()->Branch(is_smi);
- // Check that this is an object.
- __ CmpObjectType(value.reg(), FIRST_JS_OBJECT_TYPE, kScratchRegister);
- value.Unuse();
- destination()->Split(above_equal);
-}
-
-
-// Deferred code to check whether the String JavaScript object is safe for using
-// default value of. This code is called after the bit caching this information
-// in the map has been checked with the map for the object in the map_result_
-// register. On return the register map_result_ contains 1 for true and 0 for
-// false.
-class DeferredIsStringWrapperSafeForDefaultValueOf : public DeferredCode {
- public:
- DeferredIsStringWrapperSafeForDefaultValueOf(Register object,
- Register map_result,
- Register scratch1,
- Register scratch2)
- : object_(object),
- map_result_(map_result),
- scratch1_(scratch1),
- scratch2_(scratch2) { }
-
- virtual void Generate() {
- Label false_result;
-
- // Check that map is loaded as expected.
- if (FLAG_debug_code) {
- __ cmpq(map_result_, FieldOperand(object_, HeapObject::kMapOffset));
- __ Assert(equal, "Map not in expected register");
- }
-
- // Check for fast case object. Generate false result for slow case object.
- __ movq(scratch1_, FieldOperand(object_, JSObject::kPropertiesOffset));
- __ movq(scratch1_, FieldOperand(scratch1_, HeapObject::kMapOffset));
- __ CompareRoot(scratch1_, Heap::kHashTableMapRootIndex);
- __ j(equal, &false_result);
-
- // Look for valueOf symbol in the descriptor array, and indicate false if
- // found. The type is not checked, so if it is a transition it is a false
- // negative.
- __ movq(map_result_,
- FieldOperand(map_result_, Map::kInstanceDescriptorsOffset));
- __ movq(scratch1_, FieldOperand(map_result_, FixedArray::kLengthOffset));
- // map_result_: descriptor array
- // scratch1_: length of descriptor array
- // Calculate the end of the descriptor array.
- SmiIndex index = masm_->SmiToIndex(scratch2_, scratch1_, kPointerSizeLog2);
- __ lea(scratch1_,
- Operand(
- map_result_, index.reg, index.scale, FixedArray::kHeaderSize));
- // Calculate location of the first key name.
- __ addq(map_result_,
- Immediate(FixedArray::kHeaderSize +
- DescriptorArray::kFirstIndex * kPointerSize));
- // Loop through all the keys in the descriptor array. If one of these is the
- // symbol valueOf the result is false.
- Label entry, loop;
- __ jmp(&entry);
- __ bind(&loop);
- __ movq(scratch2_, FieldOperand(map_result_, 0));
- __ Cmp(scratch2_, FACTORY->value_of_symbol());
- __ j(equal, &false_result);
- __ addq(map_result_, Immediate(kPointerSize));
- __ bind(&entry);
- __ cmpq(map_result_, scratch1_);
- __ j(not_equal, &loop);
-
- // Reload map as register map_result_ was used as temporary above.
- __ movq(map_result_, FieldOperand(object_, HeapObject::kMapOffset));
-
- // If a valueOf property is not found on the object check that it's
- // prototype is the un-modified String prototype. If not result is false.
- __ movq(scratch1_, FieldOperand(map_result_, Map::kPrototypeOffset));
- __ testq(scratch1_, Immediate(kSmiTagMask));
- __ j(zero, &false_result);
- __ movq(scratch1_, FieldOperand(scratch1_, HeapObject::kMapOffset));
- __ movq(scratch2_,
- Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
- __ movq(scratch2_,
- FieldOperand(scratch2_, GlobalObject::kGlobalContextOffset));
- __ cmpq(scratch1_,
- ContextOperand(
- scratch2_, Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX));
- __ j(not_equal, &false_result);
- // Set the bit in the map to indicate that it has been checked safe for
- // default valueOf and set true result.
- __ or_(FieldOperand(map_result_, Map::kBitField2Offset),
- Immediate(1 << Map::kStringWrapperSafeForDefaultValueOf));
- __ Set(map_result_, 1);
- __ jmp(exit_label());
- __ bind(&false_result);
- // Set false result.
- __ Set(map_result_, 0);
- }
-
- private:
- Register object_;
- Register map_result_;
- Register scratch1_;
- Register scratch2_;
-};
-
-
-void CodeGenerator::GenerateIsStringWrapperSafeForDefaultValueOf(
- ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop(); // Pop the string wrapper.
- obj.ToRegister();
- ASSERT(obj.is_valid());
- if (FLAG_debug_code) {
- __ AbortIfSmi(obj.reg());
- }
-
- // Check whether this map has already been checked to be safe for default
- // valueOf.
- Result map_result = allocator()->Allocate();
- ASSERT(map_result.is_valid());
- __ movq(map_result.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset));
- __ testb(FieldOperand(map_result.reg(), Map::kBitField2Offset),
- Immediate(1 << Map::kStringWrapperSafeForDefaultValueOf));
- destination()->true_target()->Branch(not_zero);
-
- // We need an additional two scratch registers for the deferred code.
- Result temp1 = allocator()->Allocate();
- ASSERT(temp1.is_valid());
- Result temp2 = allocator()->Allocate();
- ASSERT(temp2.is_valid());
-
- DeferredIsStringWrapperSafeForDefaultValueOf* deferred =
- new DeferredIsStringWrapperSafeForDefaultValueOf(
- obj.reg(), map_result.reg(), temp1.reg(), temp2.reg());
- deferred->Branch(zero);
- deferred->BindExit();
- __ testq(map_result.reg(), map_result.reg());
- obj.Unuse();
- map_result.Unuse();
- temp1.Unuse();
- temp2.Unuse();
- destination()->Split(not_equal);
-}
-
-
-void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
- // This generates a fast version of:
- // (%_ClassOf(arg) === 'Function')
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop();
- obj.ToRegister();
- Condition is_smi = masm_->CheckSmi(obj.reg());
- destination()->false_target()->Branch(is_smi);
- __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, kScratchRegister);
- obj.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateIsUndetectableObject(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result obj = frame_->Pop();
- obj.ToRegister();
- Condition is_smi = masm_->CheckSmi(obj.reg());
- destination()->false_target()->Branch(is_smi);
- __ movq(kScratchRegister, FieldOperand(obj.reg(), HeapObject::kMapOffset));
- __ movzxbl(kScratchRegister,
- FieldOperand(kScratchRegister, Map::kBitFieldOffset));
- __ testl(kScratchRegister, Immediate(1 << Map::kIsUndetectable));
- obj.Unuse();
- destination()->Split(not_zero);
-}
-
-
-void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
-
- // Get the frame pointer for the calling frame.
- Result fp = allocator()->Allocate();
- __ movq(fp.reg(), Operand(rbp, StandardFrameConstants::kCallerFPOffset));
-
- // Skip the arguments adaptor frame if it exists.
- Label check_frame_marker;
- __ Cmp(Operand(fp.reg(), StandardFrameConstants::kContextOffset),
- Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
- __ j(not_equal, &check_frame_marker);
- __ movq(fp.reg(), Operand(fp.reg(), StandardFrameConstants::kCallerFPOffset));
-
- // Check the marker in the calling frame.
- __ bind(&check_frame_marker);
- __ Cmp(Operand(fp.reg(), StandardFrameConstants::kMarkerOffset),
- Smi::FromInt(StackFrame::CONSTRUCT));
- fp.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
-
- Result fp = allocator_->Allocate();
- Result result = allocator_->Allocate();
- ASSERT(fp.is_valid() && result.is_valid());
-
- Label exit;
-
- // Get the number of formal parameters.
- __ Move(result.reg(), Smi::FromInt(scope()->num_parameters()));
-
- // Check if the calling frame is an arguments adaptor frame.
- __ movq(fp.reg(), Operand(rbp, StandardFrameConstants::kCallerFPOffset));
- __ Cmp(Operand(fp.reg(), StandardFrameConstants::kContextOffset),
- Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
- __ j(not_equal, &exit);
-
- // Arguments adaptor case: Read the arguments length from the
- // adaptor frame.
- __ movq(result.reg(),
- Operand(fp.reg(), ArgumentsAdaptorFrameConstants::kLengthOffset));
-
- __ bind(&exit);
- result.set_type_info(TypeInfo::Smi());
- if (FLAG_debug_code) {
- __ AbortIfNotSmi(result.reg());
- }
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateClassOf(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- JumpTarget leave, null, function, non_function_constructor;
- Load(args->at(0)); // Load the object.
- Result obj = frame_->Pop();
- obj.ToRegister();
- frame_->Spill(obj.reg());
-
- // If the object is a smi, we return null.
- Condition is_smi = masm_->CheckSmi(obj.reg());
- null.Branch(is_smi);
-
- // Check that the object is a JS object but take special care of JS
- // functions to make sure they have 'Function' as their class.
-
- __ CmpObjectType(obj.reg(), FIRST_JS_OBJECT_TYPE, obj.reg());
- null.Branch(below);
-
- // As long as JS_FUNCTION_TYPE is the last instance type and it is
- // right after LAST_JS_OBJECT_TYPE, we can avoid checking for
- // LAST_JS_OBJECT_TYPE.
- ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
- ASSERT(JS_FUNCTION_TYPE == LAST_JS_OBJECT_TYPE + 1);
- __ CmpInstanceType(obj.reg(), JS_FUNCTION_TYPE);
- function.Branch(equal);
-
- // Check if the constructor in the map is a function.
- __ movq(obj.reg(), FieldOperand(obj.reg(), Map::kConstructorOffset));
- __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, kScratchRegister);
- non_function_constructor.Branch(not_equal);
-
- // The obj register now contains the constructor function. Grab the
- // instance class name from there.
- __ movq(obj.reg(),
- FieldOperand(obj.reg(), JSFunction::kSharedFunctionInfoOffset));
- __ movq(obj.reg(),
- FieldOperand(obj.reg(),
- SharedFunctionInfo::kInstanceClassNameOffset));
- frame_->Push(&obj);
- leave.Jump();
-
- // Functions have class 'Function'.
- function.Bind();
- frame_->Push(FACTORY->function_class_symbol());
- leave.Jump();
-
- // Objects with a non-function constructor have class 'Object'.
- non_function_constructor.Bind();
- frame_->Push(FACTORY->Object_symbol());
- leave.Jump();
-
- // Non-JS objects have class null.
- null.Bind();
- frame_->Push(FACTORY->null_value());
-
- // All done.
- leave.Bind();
-}
-
-
-void CodeGenerator::GenerateValueOf(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- JumpTarget leave;
- Load(args->at(0)); // Load the object.
- frame_->Dup();
- Result object = frame_->Pop();
- object.ToRegister();
- ASSERT(object.is_valid());
- // if (object->IsSmi()) return object.
- Condition is_smi = masm_->CheckSmi(object.reg());
- leave.Branch(is_smi);
- // It is a heap object - get map.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- // if (!object->IsJSValue()) return object.
- __ CmpObjectType(object.reg(), JS_VALUE_TYPE, temp.reg());
- leave.Branch(not_equal);
- __ movq(temp.reg(), FieldOperand(object.reg(), JSValue::kValueOffset));
- object.Unuse();
- frame_->SetElementAt(0, &temp);
- leave.Bind();
-}
-
-
-void CodeGenerator::GenerateSetValueOf(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
- JumpTarget leave;
- Load(args->at(0)); // Load the object.
- Load(args->at(1)); // Load the value.
- Result value = frame_->Pop();
- Result object = frame_->Pop();
- value.ToRegister();
- object.ToRegister();
-
- // if (object->IsSmi()) return value.
- Condition is_smi = masm_->CheckSmi(object.reg());
- leave.Branch(is_smi, &value);
-
- // It is a heap object - get its map.
- Result scratch = allocator_->Allocate();
- ASSERT(scratch.is_valid());
- // if (!object->IsJSValue()) return value.
- __ CmpObjectType(object.reg(), JS_VALUE_TYPE, scratch.reg());
- leave.Branch(not_equal, &value);
-
- // Store the value.
- __ movq(FieldOperand(object.reg(), JSValue::kValueOffset), value.reg());
- // Update the write barrier. Save the value as it will be
- // overwritten by the write barrier code and is needed afterward.
- Result duplicate_value = allocator_->Allocate();
- ASSERT(duplicate_value.is_valid());
- __ movq(duplicate_value.reg(), value.reg());
- // The object register is also overwritten by the write barrier and
- // possibly aliased in the frame.
- frame_->Spill(object.reg());
- __ RecordWrite(object.reg(), JSValue::kValueOffset, duplicate_value.reg(),
- scratch.reg());
- object.Unuse();
- scratch.Unuse();
- duplicate_value.Unuse();
-
- // Leave.
- leave.Bind(&value);
- frame_->Push(&value);
-}
-
-
-void CodeGenerator::GenerateArguments(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
-
- // ArgumentsAccessStub expects the key in rdx and the formal
- // parameter count in rax.
- Load(args->at(0));
- Result key = frame_->Pop();
- // Explicitly create a constant result.
- Result count(Handle<Smi>(Smi::FromInt(scope()->num_parameters())));
- // Call the shared stub to get to arguments[key].
- ArgumentsAccessStub stub(ArgumentsAccessStub::READ_ELEMENT);
- Result result = frame_->CallStub(&stub, &key, &count);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateObjectEquals(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
-
- // Load the two objects into registers and perform the comparison.
- Load(args->at(0));
- Load(args->at(1));
- Result right = frame_->Pop();
- Result left = frame_->Pop();
- right.ToRegister();
- left.ToRegister();
- __ cmpq(right.reg(), left.reg());
- right.Unuse();
- left.Unuse();
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateGetFramePointer(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
- // RBP value is aligned, so it should be tagged as a smi (without necesarily
- // being padded as a smi, so it should not be treated as a smi.).
- STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
- Result rbp_as_smi = allocator_->Allocate();
- ASSERT(rbp_as_smi.is_valid());
- __ movq(rbp_as_smi.reg(), rbp);
- frame_->Push(&rbp_as_smi);
-}
-
-
-void CodeGenerator::GenerateRandomHeapNumber(
- ZoneList<Expression*>* args) {
- ASSERT(args->length() == 0);
- frame_->SpillAll();
-
- Label slow_allocate_heapnumber;
- Label heapnumber_allocated;
- __ AllocateHeapNumber(rbx, rcx, &slow_allocate_heapnumber);
- __ jmp(&heapnumber_allocated);
-
- __ bind(&slow_allocate_heapnumber);
- // Allocate a heap number.
- __ CallRuntime(Runtime::kNumberAlloc, 0);
- __ movq(rbx, rax);
-
- __ bind(&heapnumber_allocated);
-
- // Return a random uint32 number in rax.
- // The fresh HeapNumber is in rbx, which is callee-save on both x64 ABIs.
- __ PrepareCallCFunction(1);
-#ifdef _WIN64
- __ LoadAddress(rcx, ExternalReference::isolate_address());
-#else
- __ LoadAddress(rdi, ExternalReference::isolate_address());
-#endif
- __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
-
- // Convert 32 random bits in rax to 0.(32 random bits) in a double
- // by computing:
- // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
- __ movl(rcx, Immediate(0x49800000)); // 1.0 x 2^20 as single.
- __ movd(xmm1, rcx);
- __ movd(xmm0, rax);
- __ cvtss2sd(xmm1, xmm1);
- __ xorpd(xmm0, xmm1);
- __ subsd(xmm0, xmm1);
- __ movsd(FieldOperand(rbx, HeapNumber::kValueOffset), xmm0);
-
- __ movq(rax, rbx);
- Result result = allocator_->Allocate(rax);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateStringAdd(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
-
- StringAddStub stub(NO_STRING_ADD_FLAGS);
- Result answer = frame_->CallStub(&stub, 2);
- frame_->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateSubString(ZoneList<Expression*>* args) {
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
-
- SubStringStub stub;
- Result answer = frame_->CallStub(&stub, 3);
- frame_->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateStringCompare(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
-
- StringCompareStub stub;
- Result answer = frame_->CallStub(&stub, 2);
- frame_->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateRegExpExec(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 4);
-
- // Load the arguments on the stack and call the runtime system.
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
- Load(args->at(3));
- RegExpExecStub stub;
- Result result = frame_->CallStub(&stub, 4);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateRegExpConstructResult(ZoneList<Expression*>* args) {
- ASSERT_EQ(3, args->length());
- Load(args->at(0)); // Size of array, smi.
- Load(args->at(1)); // "index" property value.
- Load(args->at(2)); // "input" property value.
- RegExpConstructResultStub stub;
- Result result = frame_->CallStub(&stub, 3);
- frame_->Push(&result);
-}
-
-
-class DeferredSearchCache: public DeferredCode {
- public:
- DeferredSearchCache(Register dst,
- Register cache,
- Register key,
- Register scratch)
- : dst_(dst), cache_(cache), key_(key), scratch_(scratch) {
- set_comment("[ DeferredSearchCache");
- }
-
- virtual void Generate();
-
- private:
- Register dst_; // on invocation index of finger (as int32), on exit
- // holds value being looked up.
- Register cache_; // instance of JSFunctionResultCache.
- Register key_; // key being looked up.
- Register scratch_;
-};
-
-
-// Return a position of the element at |index| + |additional_offset|
-// in FixedArray pointer to which is held in |array|. |index| is int32.
-static Operand ArrayElement(Register array,
- Register index,
- int additional_offset = 0) {
- int offset = FixedArray::kHeaderSize + additional_offset * kPointerSize;
- return FieldOperand(array, index, times_pointer_size, offset);
-}
-
-
-void DeferredSearchCache::Generate() {
- Label first_loop, search_further, second_loop, cache_miss;
-
- Immediate kEntriesIndexImm = Immediate(JSFunctionResultCache::kEntriesIndex);
- Immediate kEntrySizeImm = Immediate(JSFunctionResultCache::kEntrySize);
-
- // Check the cache from finger to start of the cache.
- __ bind(&first_loop);
- __ subl(dst_, kEntrySizeImm);
- __ cmpl(dst_, kEntriesIndexImm);
- __ j(less, &search_further);
-
- __ cmpq(ArrayElement(cache_, dst_), key_);
- __ j(not_equal, &first_loop);
-
- __ Integer32ToSmiField(
- FieldOperand(cache_, JSFunctionResultCache::kFingerOffset), dst_);
- __ movq(dst_, ArrayElement(cache_, dst_, 1));
- __ jmp(exit_label());
-
- __ bind(&search_further);
-
- // Check the cache from end of cache up to finger.
- __ SmiToInteger32(dst_,
- FieldOperand(cache_,
- JSFunctionResultCache::kCacheSizeOffset));
- __ SmiToInteger32(scratch_,
- FieldOperand(cache_, JSFunctionResultCache::kFingerOffset));
-
- __ bind(&second_loop);
- __ subl(dst_, kEntrySizeImm);
- __ cmpl(dst_, scratch_);
- __ j(less_equal, &cache_miss);
-
- __ cmpq(ArrayElement(cache_, dst_), key_);
- __ j(not_equal, &second_loop);
-
- __ Integer32ToSmiField(
- FieldOperand(cache_, JSFunctionResultCache::kFingerOffset), dst_);
- __ movq(dst_, ArrayElement(cache_, dst_, 1));
- __ jmp(exit_label());
-
- __ bind(&cache_miss);
- __ push(cache_); // store a reference to cache
- __ push(key_); // store a key
- __ push(Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
- __ push(key_);
- // On x64 function must be in rdi.
- __ movq(rdi, FieldOperand(cache_, JSFunctionResultCache::kFactoryOffset));
- ParameterCount expected(1);
- __ InvokeFunction(rdi, expected, CALL_FUNCTION);
-
- // Find a place to put new cached value into.
- Label add_new_entry, update_cache;
- __ movq(rcx, Operand(rsp, kPointerSize)); // restore the cache
- // Possible optimization: cache size is constant for the given cache
- // so technically we could use a constant here. However, if we have
- // cache miss this optimization would hardly matter much.
-
- // Check if we could add new entry to cache.
- __ SmiToInteger32(rbx, FieldOperand(rcx, FixedArray::kLengthOffset));
- __ SmiToInteger32(r9,
- FieldOperand(rcx, JSFunctionResultCache::kCacheSizeOffset));
- __ cmpl(rbx, r9);
- __ j(greater, &add_new_entry);
-
- // Check if we could evict entry after finger.
- __ SmiToInteger32(rdx,
- FieldOperand(rcx, JSFunctionResultCache::kFingerOffset));
- __ addl(rdx, kEntrySizeImm);
- Label forward;
- __ cmpl(rbx, rdx);
- __ j(greater, &forward);
- // Need to wrap over the cache.
- __ movl(rdx, kEntriesIndexImm);
- __ bind(&forward);
- __ movl(r9, rdx);
- __ jmp(&update_cache);
-
- __ bind(&add_new_entry);
- // r9 holds cache size as int32.
- __ leal(rbx, Operand(r9, JSFunctionResultCache::kEntrySize));
- __ Integer32ToSmiField(
- FieldOperand(rcx, JSFunctionResultCache::kCacheSizeOffset), rbx);
-
- // Update the cache itself.
- // r9 holds the index as int32.
- __ bind(&update_cache);
- __ pop(rbx); // restore the key
- __ Integer32ToSmiField(
- FieldOperand(rcx, JSFunctionResultCache::kFingerOffset), r9);
- // Store key.
- __ movq(ArrayElement(rcx, r9), rbx);
- __ RecordWrite(rcx, 0, rbx, r9);
-
- // Store value.
- __ pop(rcx); // restore the cache.
- __ SmiToInteger32(rdx,
- FieldOperand(rcx, JSFunctionResultCache::kFingerOffset));
- __ incl(rdx);
- // Backup rax, because the RecordWrite macro clobbers its arguments.
- __ movq(rbx, rax);
- __ movq(ArrayElement(rcx, rdx), rax);
- __ RecordWrite(rcx, 0, rbx, rdx);
-
- if (!dst_.is(rax)) {
- __ movq(dst_, rax);
- }
-}
-
-
-void CodeGenerator::GenerateGetFromCache(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
-
- ASSERT_NE(NULL, args->at(0)->AsLiteral());
- int cache_id = Smi::cast(*(args->at(0)->AsLiteral()->handle()))->value();
-
- Handle<FixedArray> jsfunction_result_caches(
- Isolate::Current()->global_context()->jsfunction_result_caches());
- if (jsfunction_result_caches->length() <= cache_id) {
- __ Abort("Attempt to use undefined cache.");
- frame_->Push(FACTORY->undefined_value());
- return;
- }
-
- Load(args->at(1));
- Result key = frame_->Pop();
- key.ToRegister();
-
- Result cache = allocator()->Allocate();
- ASSERT(cache.is_valid());
- __ movq(cache.reg(), ContextOperand(rsi, Context::GLOBAL_INDEX));
- __ movq(cache.reg(),
- FieldOperand(cache.reg(), GlobalObject::kGlobalContextOffset));
- __ movq(cache.reg(),
- ContextOperand(cache.reg(), Context::JSFUNCTION_RESULT_CACHES_INDEX));
- __ movq(cache.reg(),
- FieldOperand(cache.reg(), FixedArray::OffsetOfElementAt(cache_id)));
-
- Result tmp = allocator()->Allocate();
- ASSERT(tmp.is_valid());
-
- Result scratch = allocator()->Allocate();
- ASSERT(scratch.is_valid());
-
- DeferredSearchCache* deferred = new DeferredSearchCache(tmp.reg(),
- cache.reg(),
- key.reg(),
- scratch.reg());
-
- const int kFingerOffset =
- FixedArray::OffsetOfElementAt(JSFunctionResultCache::kFingerIndex);
- // tmp.reg() now holds finger offset as a smi.
- __ SmiToInteger32(tmp.reg(), FieldOperand(cache.reg(), kFingerOffset));
- __ cmpq(key.reg(), FieldOperand(cache.reg(),
- tmp.reg(), times_pointer_size,
- FixedArray::kHeaderSize));
- deferred->Branch(not_equal);
- __ movq(tmp.reg(), FieldOperand(cache.reg(),
- tmp.reg(), times_pointer_size,
- FixedArray::kHeaderSize + kPointerSize));
-
- deferred->BindExit();
- frame_->Push(&tmp);
-}
-
-
-void CodeGenerator::GenerateNumberToString(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
-
- // Load the argument on the stack and jump to the runtime.
- Load(args->at(0));
-
- NumberToStringStub stub;
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-class DeferredSwapElements: public DeferredCode {
- public:
- DeferredSwapElements(Register object, Register index1, Register index2)
- : object_(object), index1_(index1), index2_(index2) {
- set_comment("[ DeferredSwapElements");
- }
-
- virtual void Generate();
-
- private:
- Register object_, index1_, index2_;
-};
-
-
-void DeferredSwapElements::Generate() {
- __ push(object_);
- __ push(index1_);
- __ push(index2_);
- __ CallRuntime(Runtime::kSwapElements, 3);
-}
-
-
-void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
- Comment cmnt(masm_, "[ GenerateSwapElements");
-
- ASSERT_EQ(3, args->length());
-
- Load(args->at(0));
- Load(args->at(1));
- Load(args->at(2));
-
- Result index2 = frame_->Pop();
- index2.ToRegister();
-
- Result index1 = frame_->Pop();
- index1.ToRegister();
-
- Result object = frame_->Pop();
- object.ToRegister();
-
- Result tmp1 = allocator()->Allocate();
- tmp1.ToRegister();
- Result tmp2 = allocator()->Allocate();
- tmp2.ToRegister();
-
- frame_->Spill(object.reg());
- frame_->Spill(index1.reg());
- frame_->Spill(index2.reg());
-
- DeferredSwapElements* deferred = new DeferredSwapElements(object.reg(),
- index1.reg(),
- index2.reg());
-
- // Fetch the map and check if array is in fast case.
- // Check that object doesn't require security checks and
- // has no indexed interceptor.
- __ CmpObjectType(object.reg(), JS_ARRAY_TYPE, tmp1.reg());
- deferred->Branch(not_equal);
- __ testb(FieldOperand(tmp1.reg(), Map::kBitFieldOffset),
- Immediate(KeyedLoadIC::kSlowCaseBitFieldMask));
- deferred->Branch(not_zero);
-
- // Check the object's elements are in fast case and writable.
- __ movq(tmp1.reg(), FieldOperand(object.reg(), JSObject::kElementsOffset));
- __ CompareRoot(FieldOperand(tmp1.reg(), HeapObject::kMapOffset),
- Heap::kFixedArrayMapRootIndex);
- deferred->Branch(not_equal);
-
- // Check that both indices are smis.
- Condition both_smi = masm()->CheckBothSmi(index1.reg(), index2.reg());
- deferred->Branch(NegateCondition(both_smi));
-
- // Check that both indices are valid.
- __ movq(tmp2.reg(), FieldOperand(object.reg(), JSArray::kLengthOffset));
- __ SmiCompare(tmp2.reg(), index1.reg());
- deferred->Branch(below_equal);
- __ SmiCompare(tmp2.reg(), index2.reg());
- deferred->Branch(below_equal);
-
- // Bring addresses into index1 and index2.
- __ SmiToInteger32(index1.reg(), index1.reg());
- __ lea(index1.reg(), FieldOperand(tmp1.reg(),
- index1.reg(),
- times_pointer_size,
- FixedArray::kHeaderSize));
- __ SmiToInteger32(index2.reg(), index2.reg());
- __ lea(index2.reg(), FieldOperand(tmp1.reg(),
- index2.reg(),
- times_pointer_size,
- FixedArray::kHeaderSize));
-
- // Swap elements.
- __ movq(object.reg(), Operand(index1.reg(), 0));
- __ movq(tmp2.reg(), Operand(index2.reg(), 0));
- __ movq(Operand(index2.reg(), 0), object.reg());
- __ movq(Operand(index1.reg(), 0), tmp2.reg());
-
- Label done;
- __ InNewSpace(tmp1.reg(), tmp2.reg(), equal, &done);
- // Possible optimization: do a check that both values are smis
- // (or them and test against Smi mask.)
-
- __ movq(tmp2.reg(), tmp1.reg());
- __ RecordWriteHelper(tmp1.reg(), index1.reg(), object.reg());
- __ RecordWriteHelper(tmp2.reg(), index2.reg(), object.reg());
- __ bind(&done);
-
- deferred->BindExit();
- frame_->Push(FACTORY->undefined_value());
-}
-
-
-void CodeGenerator::GenerateCallFunction(ZoneList<Expression*>* args) {
- Comment cmnt(masm_, "[ GenerateCallFunction");
-
- ASSERT(args->length() >= 2);
-
- int n_args = args->length() - 2; // for receiver and function.
- Load(args->at(0)); // receiver
- for (int i = 0; i < n_args; i++) {
- Load(args->at(i + 1));
- }
- Load(args->at(n_args + 1)); // function
- Result result = frame_->CallJSFunction(n_args);
- frame_->Push(&result);
-}
-
-
-// Generates the Math.pow method. Only handles special cases and
-// branches to the runtime system for everything else. Please note
-// that this function assumes that the callsite has executed ToNumber
-// on both arguments.
-void CodeGenerator::GenerateMathPow(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 2);
- Load(args->at(0));
- Load(args->at(1));
-
- Label allocate_return;
- // Load the two operands while leaving the values on the frame.
- frame()->Dup();
- Result exponent = frame()->Pop();
- exponent.ToRegister();
- frame()->Spill(exponent.reg());
- frame()->PushElementAt(1);
- Result base = frame()->Pop();
- base.ToRegister();
- frame()->Spill(base.reg());
-
- Result answer = allocator()->Allocate();
- ASSERT(answer.is_valid());
- ASSERT(!exponent.reg().is(base.reg()));
- JumpTarget call_runtime;
-
- // Save 1 in xmm3 - we need this several times later on.
- __ movl(answer.reg(), Immediate(1));
- __ cvtlsi2sd(xmm3, answer.reg());
-
- Label exponent_nonsmi;
- Label base_nonsmi;
- // If the exponent is a heap number go to that specific case.
- __ JumpIfNotSmi(exponent.reg(), &exponent_nonsmi);
- __ JumpIfNotSmi(base.reg(), &base_nonsmi);
-
- // Optimized version when y is an integer.
- Label powi;
- __ SmiToInteger32(base.reg(), base.reg());
- __ cvtlsi2sd(xmm0, base.reg());
- __ jmp(&powi);
- // exponent is smi and base is a heapnumber.
- __ bind(&base_nonsmi);
- __ CompareRoot(FieldOperand(base.reg(), HeapObject::kMapOffset),
- Heap::kHeapNumberMapRootIndex);
- call_runtime.Branch(not_equal);
-
- __ movsd(xmm0, FieldOperand(base.reg(), HeapNumber::kValueOffset));
-
- // Optimized version of pow if y is an integer.
- __ bind(&powi);
- __ SmiToInteger32(exponent.reg(), exponent.reg());
-
- // Save exponent in base as we need to check if exponent is negative later.
- // We know that base and exponent are in different registers.
- __ movl(base.reg(), exponent.reg());
-
- // Get absolute value of exponent.
- Label no_neg;
- __ cmpl(exponent.reg(), Immediate(0));
- __ j(greater_equal, &no_neg);
- __ negl(exponent.reg());
- __ bind(&no_neg);
-
- // Load xmm1 with 1.
- __ movsd(xmm1, xmm3);
- Label while_true;
- Label no_multiply;
-
- __ bind(&while_true);
- __ shrl(exponent.reg(), Immediate(1));
- __ j(not_carry, &no_multiply);
- __ mulsd(xmm1, xmm0);
- __ bind(&no_multiply);
- __ testl(exponent.reg(), exponent.reg());
- __ mulsd(xmm0, xmm0);
- __ j(not_zero, &while_true);
-
- // x has the original value of y - if y is negative return 1/result.
- __ testl(base.reg(), base.reg());
- __ j(positive, &allocate_return);
- // Special case if xmm1 has reached infinity.
- __ movl(answer.reg(), Immediate(0x7FB00000));
- __ movd(xmm0, answer.reg());
- __ cvtss2sd(xmm0, xmm0);
- __ ucomisd(xmm0, xmm1);
- call_runtime.Branch(equal);
- __ divsd(xmm3, xmm1);
- __ movsd(xmm1, xmm3);
- __ jmp(&allocate_return);
-
- // exponent (or both) is a heapnumber - no matter what we should now work
- // on doubles.
- __ bind(&exponent_nonsmi);
- __ CompareRoot(FieldOperand(exponent.reg(), HeapObject::kMapOffset),
- Heap::kHeapNumberMapRootIndex);
- call_runtime.Branch(not_equal);
- __ movsd(xmm1, FieldOperand(exponent.reg(), HeapNumber::kValueOffset));
- // Test if exponent is nan.
- __ ucomisd(xmm1, xmm1);
- call_runtime.Branch(parity_even);
-
- Label base_not_smi;
- Label handle_special_cases;
- __ JumpIfNotSmi(base.reg(), &base_not_smi);
- __ SmiToInteger32(base.reg(), base.reg());
- __ cvtlsi2sd(xmm0, base.reg());
- __ jmp(&handle_special_cases);
- __ bind(&base_not_smi);
- __ CompareRoot(FieldOperand(base.reg(), HeapObject::kMapOffset),
- Heap::kHeapNumberMapRootIndex);
- call_runtime.Branch(not_equal);
- __ movl(answer.reg(), FieldOperand(base.reg(), HeapNumber::kExponentOffset));
- __ andl(answer.reg(), Immediate(HeapNumber::kExponentMask));
- __ cmpl(answer.reg(), Immediate(HeapNumber::kExponentMask));
- // base is NaN or +/-Infinity
- call_runtime.Branch(greater_equal);
- __ movsd(xmm0, FieldOperand(base.reg(), HeapNumber::kValueOffset));
-
- // base is in xmm0 and exponent is in xmm1.
- __ bind(&handle_special_cases);
- Label not_minus_half;
- // Test for -0.5.
- // Load xmm2 with -0.5.
- __ movl(answer.reg(), Immediate(0xBF000000));
- __ movd(xmm2, answer.reg());
- __ cvtss2sd(xmm2, xmm2);
- // xmm2 now has -0.5.
- __ ucomisd(xmm2, xmm1);
- __ j(not_equal, ¬_minus_half);
-
- // Calculates reciprocal of square root.
- // sqrtsd returns -0 when input is -0. ECMA spec requires +0.
- __ xorpd(xmm1, xmm1);
- __ addsd(xmm1, xmm0);
- __ sqrtsd(xmm1, xmm1);
- __ divsd(xmm3, xmm1);
- __ movsd(xmm1, xmm3);
- __ jmp(&allocate_return);
-
- // Test for 0.5.
- __ bind(¬_minus_half);
- // Load xmm2 with 0.5.
- // Since xmm3 is 1 and xmm2 is -0.5 this is simply xmm2 + xmm3.
- __ addsd(xmm2, xmm3);
- // xmm2 now has 0.5.
- __ ucomisd(xmm2, xmm1);
- call_runtime.Branch(not_equal);
-
- // Calculates square root.
- // sqrtsd returns -0 when input is -0. ECMA spec requires +0.
- __ xorpd(xmm1, xmm1);
- __ addsd(xmm1, xmm0);
- __ sqrtsd(xmm1, xmm1);
-
- JumpTarget done;
- Label failure, success;
- __ bind(&allocate_return);
- // Make a copy of the frame to enable us to handle allocation
- // failure after the JumpTarget jump.
- VirtualFrame* clone = new VirtualFrame(frame());
- __ AllocateHeapNumber(answer.reg(), exponent.reg(), &failure);
- __ movsd(FieldOperand(answer.reg(), HeapNumber::kValueOffset), xmm1);
- // Remove the two original values from the frame - we only need those
- // in the case where we branch to runtime.
- frame()->Drop(2);
- exponent.Unuse();
- base.Unuse();
- done.Jump(&answer);
- // Use the copy of the original frame as our current frame.
- RegisterFile empty_regs;
- SetFrame(clone, &empty_regs);
- // If we experience an allocation failure we branch to runtime.
- __ bind(&failure);
- call_runtime.Bind();
- answer = frame()->CallRuntime(Runtime::kMath_pow_cfunction, 2);
-
- done.Bind(&answer);
- frame()->Push(&answer);
-}
-
-
-void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- TranscendentalCacheStub stub(TranscendentalCache::SIN,
- TranscendentalCacheStub::TAGGED);
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- TranscendentalCacheStub stub(TranscendentalCache::COS,
- TranscendentalCacheStub::TAGGED);
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-void CodeGenerator::GenerateMathLog(ZoneList<Expression*>* args) {
- ASSERT_EQ(args->length(), 1);
- Load(args->at(0));
- TranscendentalCacheStub stub(TranscendentalCache::LOG,
- TranscendentalCacheStub::TAGGED);
- Result result = frame_->CallStub(&stub, 1);
- frame_->Push(&result);
-}
-
-
-// Generates the Math.sqrt method. Please note - this function assumes that
-// the callsite has executed ToNumber on the argument.
-void CodeGenerator::GenerateMathSqrt(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
-
- // Leave original value on the frame if we need to call runtime.
- frame()->Dup();
- Result result = frame()->Pop();
- result.ToRegister();
- frame()->Spill(result.reg());
- Label runtime;
- Label non_smi;
- Label load_done;
- JumpTarget end;
-
- __ JumpIfNotSmi(result.reg(), &non_smi);
- __ SmiToInteger32(result.reg(), result.reg());
- __ cvtlsi2sd(xmm0, result.reg());
- __ jmp(&load_done);
- __ bind(&non_smi);
- __ CompareRoot(FieldOperand(result.reg(), HeapObject::kMapOffset),
- Heap::kHeapNumberMapRootIndex);
- __ j(not_equal, &runtime);
- __ movsd(xmm0, FieldOperand(result.reg(), HeapNumber::kValueOffset));
-
- __ bind(&load_done);
- __ sqrtsd(xmm0, xmm0);
- // A copy of the virtual frame to allow us to go to runtime after the
- // JumpTarget jump.
- Result scratch = allocator()->Allocate();
- VirtualFrame* clone = new VirtualFrame(frame());
- __ AllocateHeapNumber(result.reg(), scratch.reg(), &runtime);
-
- __ movsd(FieldOperand(result.reg(), HeapNumber::kValueOffset), xmm0);
- frame()->Drop(1);
- scratch.Unuse();
- end.Jump(&result);
- // We only branch to runtime if we have an allocation error.
- // Use the copy of the original frame as our current frame.
- RegisterFile empty_regs;
- SetFrame(clone, &empty_regs);
- __ bind(&runtime);
- result = frame()->CallRuntime(Runtime::kMath_sqrt, 1);
-
- end.Bind(&result);
- frame()->Push(&result);
-}
-
-
-void CodeGenerator::GenerateIsRegExpEquivalent(ZoneList<Expression*>* args) {
- ASSERT_EQ(2, args->length());
- Load(args->at(0));
- Load(args->at(1));
- Result right_res = frame_->Pop();
- Result left_res = frame_->Pop();
- right_res.ToRegister();
- left_res.ToRegister();
- Result tmp_res = allocator()->Allocate();
- ASSERT(tmp_res.is_valid());
- Register right = right_res.reg();
- Register left = left_res.reg();
- Register tmp = tmp_res.reg();
- right_res.Unuse();
- left_res.Unuse();
- tmp_res.Unuse();
- __ cmpq(left, right);
- destination()->true_target()->Branch(equal);
- // Fail if either is a non-HeapObject.
- Condition either_smi =
- masm()->CheckEitherSmi(left, right, tmp);
- destination()->false_target()->Branch(either_smi);
- __ movq(tmp, FieldOperand(left, HeapObject::kMapOffset));
- __ cmpb(FieldOperand(tmp, Map::kInstanceTypeOffset),
- Immediate(JS_REGEXP_TYPE));
- destination()->false_target()->Branch(not_equal);
- __ cmpq(tmp, FieldOperand(right, HeapObject::kMapOffset));
- destination()->false_target()->Branch(not_equal);
- __ movq(tmp, FieldOperand(left, JSRegExp::kDataOffset));
- __ cmpq(tmp, FieldOperand(right, JSRegExp::kDataOffset));
- destination()->Split(equal);
-}
-
-
-void CodeGenerator::GenerateHasCachedArrayIndex(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result value = frame_->Pop();
- value.ToRegister();
- ASSERT(value.is_valid());
- __ testl(FieldOperand(value.reg(), String::kHashFieldOffset),
- Immediate(String::kContainsCachedArrayIndexMask));
- value.Unuse();
- destination()->Split(zero);
-}
-
-
-void CodeGenerator::GenerateGetCachedArrayIndex(ZoneList<Expression*>* args) {
- ASSERT(args->length() == 1);
- Load(args->at(0));
- Result string = frame_->Pop();
- string.ToRegister();
-
- Result number = allocator()->Allocate();
- ASSERT(number.is_valid());
- __ movl(number.reg(), FieldOperand(string.reg(), String::kHashFieldOffset));
- __ IndexFromHash(number.reg(), number.reg());
- string.Unuse();
- frame_->Push(&number);
-}
-
-
-void CodeGenerator::GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args) {
- frame_->Push(FACTORY->undefined_value());
-}
-
-
-void CodeGenerator::VisitCallRuntime(CallRuntime* node) {
- if (CheckForInlineRuntimeCall(node)) {
- return;
- }
-
- ZoneList<Expression*>* args = node->arguments();
- Comment cmnt(masm_, "[ CallRuntime");
- const Runtime::Function* function = node->function();
-
- if (function == NULL) {
- // Push the builtins object found in the current global object.
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ movq(temp.reg(), GlobalObjectOperand());
- __ movq(temp.reg(),
- FieldOperand(temp.reg(), GlobalObject::kBuiltinsOffset));
- frame_->Push(&temp);
- }
-
- // Push the arguments ("left-to-right").
- int arg_count = args->length();
- for (int i = 0; i < arg_count; i++) {
- Load(args->at(i));
- }
-
- if (function == NULL) {
- // Call the JS runtime function.
- frame_->Push(node->name());
- Result answer = frame_->CallCallIC(RelocInfo::CODE_TARGET,
- arg_count,
- loop_nesting_);
- frame_->RestoreContextRegister();
- frame_->Push(&answer);
- } else {
- // Call the C runtime function.
- Result answer = frame_->CallRuntime(function, arg_count);
- frame_->Push(&answer);
- }
-}
-
-
-void CodeGenerator::VisitUnaryOperation(UnaryOperation* node) {
- Comment cmnt(masm_, "[ UnaryOperation");
-
- Token::Value op = node->op();
-
- if (op == Token::NOT) {
- // Swap the true and false targets but keep the same actual label
- // as the fall through.
- destination()->Invert();
- LoadCondition(node->expression(), destination(), true);
- // Swap the labels back.
- destination()->Invert();
-
- } else if (op == Token::DELETE) {
- Property* property = node->expression()->AsProperty();
- if (property != NULL) {
- Load(property->obj());
- Load(property->key());
- frame_->Push(Smi::FromInt(strict_mode_flag()));
- Result answer = frame_->InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION, 3);
- frame_->Push(&answer);
- return;
- }
-
- Variable* variable = node->expression()->AsVariableProxy()->AsVariable();
- if (variable != NULL) {
- // Delete of an unqualified identifier is disallowed in strict mode
- // but "delete this" is.
- ASSERT(strict_mode_flag() == kNonStrictMode || variable->is_this());
- Slot* slot = variable->AsSlot();
- if (variable->is_global()) {
- LoadGlobal();
- frame_->Push(variable->name());
- frame_->Push(Smi::FromInt(kNonStrictMode));
- Result answer = frame_->InvokeBuiltin(Builtins::DELETE,
- CALL_FUNCTION, 3);
- frame_->Push(&answer);
-
- } else if (slot != NULL && slot->type() == Slot::LOOKUP) {
- // Call the runtime to delete from the context holding the named
- // variable. Sync the virtual frame eagerly so we can push the
- // arguments directly into place.
- frame_->SyncRange(0, frame_->element_count() - 1);
- frame_->EmitPush(rsi);
- frame_->EmitPush(variable->name());
- Result answer = frame_->CallRuntime(Runtime::kDeleteContextSlot, 2);
- frame_->Push(&answer);
- } else {
- // Default: Result of deleting non-global, not dynamically
- // introduced variables is false.
- frame_->Push(FACTORY->false_value());
- }
- } else {
- // Default: Result of deleting expressions is true.
- Load(node->expression()); // may have side-effects
- frame_->SetElementAt(0, FACTORY->true_value());
- }
-
- } else if (op == Token::TYPEOF) {
- // Special case for loading the typeof expression; see comment on
- // LoadTypeofExpression().
- LoadTypeofExpression(node->expression());
- Result answer = frame_->CallRuntime(Runtime::kTypeof, 1);
- frame_->Push(&answer);
-
- } else if (op == Token::VOID) {
- Expression* expression = node->expression();
- if (expression && expression->AsLiteral() && (
- expression->AsLiteral()->IsTrue() ||
- expression->AsLiteral()->IsFalse() ||
- expression->AsLiteral()->handle()->IsNumber() ||
- expression->AsLiteral()->handle()->IsString() ||
- expression->AsLiteral()->handle()->IsJSRegExp() ||
- expression->AsLiteral()->IsNull())) {
- // Omit evaluating the value of the primitive literal.
- // It will be discarded anyway, and can have no side effect.
- frame_->Push(FACTORY->undefined_value());
- } else {
- Load(node->expression());
- frame_->SetElementAt(0, FACTORY->undefined_value());
- }
-
- } else {
- bool can_overwrite = node->expression()->ResultOverwriteAllowed();
- UnaryOverwriteMode overwrite =
- can_overwrite ? UNARY_OVERWRITE : UNARY_NO_OVERWRITE;
- bool no_negative_zero = node->expression()->no_negative_zero();
- Load(node->expression());
- switch (op) {
- case Token::NOT:
- case Token::DELETE:
- case Token::TYPEOF:
- UNREACHABLE(); // handled above
- break;
-
- case Token::SUB: {
- GenericUnaryOpStub stub(
- Token::SUB,
- overwrite,
- NO_UNARY_FLAGS,
- no_negative_zero ? kIgnoreNegativeZero : kStrictNegativeZero);
- Result operand = frame_->Pop();
- Result answer = frame_->CallStub(&stub, &operand);
- answer.set_type_info(TypeInfo::Number());
- frame_->Push(&answer);
- break;
- }
-
- case Token::BIT_NOT: {
- // Smi check.
- JumpTarget smi_label;
- JumpTarget continue_label;
- Result operand = frame_->Pop();
- operand.ToRegister();
-
- Condition is_smi = masm_->CheckSmi(operand.reg());
- smi_label.Branch(is_smi, &operand);
-
- GenericUnaryOpStub stub(Token::BIT_NOT,
- overwrite,
- NO_UNARY_SMI_CODE_IN_STUB);
- Result answer = frame_->CallStub(&stub, &operand);
- continue_label.Jump(&answer);
-
- smi_label.Bind(&answer);
- answer.ToRegister();
- frame_->Spill(answer.reg());
- __ SmiNot(answer.reg(), answer.reg());
- continue_label.Bind(&answer);
- answer.set_type_info(TypeInfo::Smi());
- frame_->Push(&answer);
- break;
- }
-
- case Token::ADD: {
- // Smi check.
- JumpTarget continue_label;
- Result operand = frame_->Pop();
- TypeInfo operand_info = operand.type_info();
- operand.ToRegister();
- Condition is_smi = masm_->CheckSmi(operand.reg());
- continue_label.Branch(is_smi, &operand);
- frame_->Push(&operand);
- Result answer = frame_->InvokeBuiltin(Builtins::TO_NUMBER,
- CALL_FUNCTION, 1);
-
- continue_label.Bind(&answer);
- if (operand_info.IsSmi()) {
- answer.set_type_info(TypeInfo::Smi());
- } else if (operand_info.IsInteger32()) {
- answer.set_type_info(TypeInfo::Integer32());
- } else {
- answer.set_type_info(TypeInfo::Number());
- }
- frame_->Push(&answer);
- break;
- }
- default:
- UNREACHABLE();
- }
- }
-}
-
-
-// The value in dst was optimistically incremented or decremented.
-// The result overflowed or was not smi tagged. Call into the runtime
-// to convert the argument to a number, and call the specialized add
-// or subtract stub. The result is left in dst.
-class DeferredPrefixCountOperation: public DeferredCode {
- public:
- DeferredPrefixCountOperation(Register dst,
- bool is_increment,
- TypeInfo input_type)
- : dst_(dst), is_increment_(is_increment), input_type_(input_type) {
- set_comment("[ DeferredCountOperation");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- bool is_increment_;
- TypeInfo input_type_;
-};
-
-
-void DeferredPrefixCountOperation::Generate() {
- Register left;
- if (input_type_.IsNumber()) {
- left = dst_;
- } else {
- __ push(dst_);
- __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
- left = rax;
- }
-
- GenericBinaryOpStub stub(is_increment_ ? Token::ADD : Token::SUB,
- NO_OVERWRITE,
- NO_GENERIC_BINARY_FLAGS,
- TypeInfo::Number());
- stub.GenerateCall(masm_, left, Smi::FromInt(1));
-
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-// The value in dst was optimistically incremented or decremented.
-// The result overflowed or was not smi tagged. Call into the runtime
-// to convert the argument to a number. Update the original value in
-// old. Call the specialized add or subtract stub. The result is
-// left in dst.
-class DeferredPostfixCountOperation: public DeferredCode {
- public:
- DeferredPostfixCountOperation(Register dst,
- Register old,
- bool is_increment,
- TypeInfo input_type)
- : dst_(dst),
- old_(old),
- is_increment_(is_increment),
- input_type_(input_type) {
- set_comment("[ DeferredCountOperation");
- }
-
- virtual void Generate();
-
- private:
- Register dst_;
- Register old_;
- bool is_increment_;
- TypeInfo input_type_;
-};
-
-
-void DeferredPostfixCountOperation::Generate() {
- Register left;
- if (input_type_.IsNumber()) {
- __ push(dst_); // Save the input to use as the old value.
- left = dst_;
- } else {
- __ push(dst_);
- __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
- __ push(rax); // Save the result of ToNumber to use as the old value.
- left = rax;
- }
-
- GenericBinaryOpStub stub(is_increment_ ? Token::ADD : Token::SUB,
- NO_OVERWRITE,
- NO_GENERIC_BINARY_FLAGS,
- TypeInfo::Number());
- stub.GenerateCall(masm_, left, Smi::FromInt(1));
-
- if (!dst_.is(rax)) __ movq(dst_, rax);
- __ pop(old_);
-}
-
-
-void CodeGenerator::VisitCountOperation(CountOperation* node) {
- Comment cmnt(masm_, "[ CountOperation");
-
- bool is_postfix = node->is_postfix();
- bool is_increment = node->op() == Token::INC;
-
- Variable* var = node->expression()->AsVariableProxy()->AsVariable();
- bool is_const = (var != NULL && var->mode() == Variable::CONST);
-
- // Postfix operations need a stack slot under the reference to hold
- // the old value while the new value is being stored. This is so that
- // in the case that storing the new value requires a call, the old
- // value will be in the frame to be spilled.
- if (is_postfix) frame_->Push(Smi::FromInt(0));
-
- // A constant reference is not saved to, so the reference is not a
- // compound assignment reference.
- { Reference target(this, node->expression(), !is_const);
- if (target.is_illegal()) {
- // Spoof the virtual frame to have the expected height (one higher
- // than on entry).
- if (!is_postfix) frame_->Push(Smi::FromInt(0));
- return;
- }
- target.TakeValue();
-
- Result new_value = frame_->Pop();
- new_value.ToRegister();
-
- Result old_value; // Only allocated in the postfix case.
- if (is_postfix) {
- // Allocate a temporary to preserve the old value.
- old_value = allocator_->Allocate();
- ASSERT(old_value.is_valid());
- __ movq(old_value.reg(), new_value.reg());
-
- // The return value for postfix operations is ToNumber(input).
- // Keep more precise type info if the input is some kind of
- // number already. If the input is not a number we have to wait
- // for the deferred code to convert it.
- if (new_value.type_info().IsNumber()) {
- old_value.set_type_info(new_value.type_info());
- }
- }
- // Ensure the new value is writable.
- frame_->Spill(new_value.reg());
-
- DeferredCode* deferred = NULL;
- if (is_postfix) {
- deferred = new DeferredPostfixCountOperation(new_value.reg(),
- old_value.reg(),
- is_increment,
- new_value.type_info());
- } else {
- deferred = new DeferredPrefixCountOperation(new_value.reg(),
- is_increment,
- new_value.type_info());
- }
-
- if (new_value.is_smi()) {
- if (FLAG_debug_code) { __ AbortIfNotSmi(new_value.reg()); }
- } else {
- __ JumpIfNotSmi(new_value.reg(), deferred->entry_label());
- }
- if (is_increment) {
- __ SmiAddConstant(new_value.reg(),
- new_value.reg(),
- Smi::FromInt(1),
- deferred->entry_label());
- } else {
- __ SmiSubConstant(new_value.reg(),
- new_value.reg(),
- Smi::FromInt(1),
- deferred->entry_label());
- }
- deferred->BindExit();
-
- // Postfix count operations return their input converted to
- // number. The case when the input is already a number is covered
- // above in the allocation code for old_value.
- if (is_postfix && !new_value.type_info().IsNumber()) {
- old_value.set_type_info(TypeInfo::Number());
- }
-
- new_value.set_type_info(TypeInfo::Number());
-
- // Postfix: store the old value in the allocated slot under the
- // reference.
- if (is_postfix) frame_->SetElementAt(target.size(), &old_value);
-
- frame_->Push(&new_value);
- // Non-constant: update the reference.
- if (!is_const) target.SetValue(NOT_CONST_INIT);
- }
-
- // Postfix: drop the new value and use the old.
- if (is_postfix) frame_->Drop();
-}
-
-
-void CodeGenerator::GenerateLogicalBooleanOperation(BinaryOperation* node) {
- // According to ECMA-262 section 11.11, page 58, the binary logical
- // operators must yield the result of one of the two expressions
- // before any ToBoolean() conversions. This means that the value
- // produced by a && or || operator is not necessarily a boolean.
-
- // NOTE: If the left hand side produces a materialized value (not
- // control flow), we force the right hand side to do the same. This
- // is necessary because we assume that if we get control flow on the
- // last path out of an expression we got it on all paths.
- if (node->op() == Token::AND) {
- JumpTarget is_true;
- ControlDestination dest(&is_true, destination()->false_target(), true);
- LoadCondition(node->left(), &dest, false);
-
- if (dest.false_was_fall_through()) {
- // The current false target was used as the fall-through. If
- // there are no dangling jumps to is_true then the left
- // subexpression was unconditionally false. Otherwise we have
- // paths where we do have to evaluate the right subexpression.
- if (is_true.is_linked()) {
- // We need to compile the right subexpression. If the jump to
- // the current false target was a forward jump then we have a
- // valid frame, we have just bound the false target, and we
- // have to jump around the code for the right subexpression.
- if (has_valid_frame()) {
- destination()->false_target()->Unuse();
- destination()->false_target()->Jump();
- }
- is_true.Bind();
- // The left subexpression compiled to control flow, so the
- // right one is free to do so as well.
- LoadCondition(node->right(), destination(), false);
- } else {
- // We have actually just jumped to or bound the current false
- // target but the current control destination is not marked as
- // used.
- destination()->Use(false);
- }
-
- } else if (dest.is_used()) {
- // The left subexpression compiled to control flow (and is_true
- // was just bound), so the right is free to do so as well.
- LoadCondition(node->right(), destination(), false);
-
- } else {
- // We have a materialized value on the frame, so we exit with
- // one on all paths. There are possibly also jumps to is_true
- // from nested subexpressions.
- JumpTarget pop_and_continue;
- JumpTarget exit;
-
- // Avoid popping the result if it converts to 'false' using the
- // standard ToBoolean() conversion as described in ECMA-262,
- // section 9.2, page 30.
- //
- // Duplicate the TOS value. The duplicate will be popped by
- // ToBoolean.
- frame_->Dup();
- ControlDestination dest(&pop_and_continue, &exit, true);
- ToBoolean(&dest);
-
- // Pop the result of evaluating the first part.
- frame_->Drop();
-
- // Compile right side expression.
- is_true.Bind();
- Load(node->right());
-
- // Exit (always with a materialized value).
- exit.Bind();
- }
-
- } else {
- ASSERT(node->op() == Token::OR);
- JumpTarget is_false;
- ControlDestination dest(destination()->true_target(), &is_false, false);
- LoadCondition(node->left(), &dest, false);
-
- if (dest.true_was_fall_through()) {
- // The current true target was used as the fall-through. If
- // there are no dangling jumps to is_false then the left
- // subexpression was unconditionally true. Otherwise we have
- // paths where we do have to evaluate the right subexpression.
- if (is_false.is_linked()) {
- // We need to compile the right subexpression. If the jump to
- // the current true target was a forward jump then we have a
- // valid frame, we have just bound the true target, and we
- // have to jump around the code for the right subexpression.
- if (has_valid_frame()) {
- destination()->true_target()->Unuse();
- destination()->true_target()->Jump();
- }
- is_false.Bind();
- // The left subexpression compiled to control flow, so the
- // right one is free to do so as well.
- LoadCondition(node->right(), destination(), false);
- } else {
- // We have just jumped to or bound the current true target but
- // the current control destination is not marked as used.
- destination()->Use(true);
- }
-
- } else if (dest.is_used()) {
- // The left subexpression compiled to control flow (and is_false
- // was just bound), so the right is free to do so as well.
- LoadCondition(node->right(), destination(), false);
-
- } else {
- // We have a materialized value on the frame, so we exit with
- // one on all paths. There are possibly also jumps to is_false
- // from nested subexpressions.
- JumpTarget pop_and_continue;
- JumpTarget exit;
-
- // Avoid popping the result if it converts to 'true' using the
- // standard ToBoolean() conversion as described in ECMA-262,
- // section 9.2, page 30.
- //
- // Duplicate the TOS value. The duplicate will be popped by
- // ToBoolean.
- frame_->Dup();
- ControlDestination dest(&exit, &pop_and_continue, false);
- ToBoolean(&dest);
-
- // Pop the result of evaluating the first part.
- frame_->Drop();
-
- // Compile right side expression.
- is_false.Bind();
- Load(node->right());
-
- // Exit (always with a materialized value).
- exit.Bind();
- }
- }
-}
-
-void CodeGenerator::VisitBinaryOperation(BinaryOperation* node) {
- Comment cmnt(masm_, "[ BinaryOperation");
-
- if (node->op() == Token::AND || node->op() == Token::OR) {
- GenerateLogicalBooleanOperation(node);
- } else {
- // NOTE: The code below assumes that the slow cases (calls to runtime)
- // never return a constant/immutable object.
- OverwriteMode overwrite_mode = NO_OVERWRITE;
- if (node->left()->ResultOverwriteAllowed()) {
- overwrite_mode = OVERWRITE_LEFT;
- } else if (node->right()->ResultOverwriteAllowed()) {
- overwrite_mode = OVERWRITE_RIGHT;
- }
-
- if (node->left()->IsTrivial()) {
- Load(node->right());
- Result right = frame_->Pop();
- frame_->Push(node->left());
- frame_->Push(&right);
- } else {
- Load(node->left());
- Load(node->right());
- }
- GenericBinaryOperation(node, overwrite_mode);
- }
-}
-
-
-void CodeGenerator::VisitThisFunction(ThisFunction* node) {
- frame_->PushFunction();
-}
-
-
-void CodeGenerator::VisitCompareOperation(CompareOperation* node) {
- Comment cmnt(masm_, "[ CompareOperation");
-
- // Get the expressions from the node.
- Expression* left = node->left();
- Expression* right = node->right();
- Token::Value op = node->op();
- // To make typeof testing for natives implemented in JavaScript really
- // efficient, we generate special code for expressions of the form:
- // 'typeof <expression> == <string>'.
- UnaryOperation* operation = left->AsUnaryOperation();
- if ((op == Token::EQ || op == Token::EQ_STRICT) &&
- (operation != NULL && operation->op() == Token::TYPEOF) &&
- (right->AsLiteral() != NULL &&
- right->AsLiteral()->handle()->IsString())) {
- Handle<String> check(Handle<String>::cast(right->AsLiteral()->handle()));
-
- // Load the operand and move it to a register.
- LoadTypeofExpression(operation->expression());
- Result answer = frame_->Pop();
- answer.ToRegister();
-
- if (check->Equals(HEAP->number_symbol())) {
- Condition is_smi = masm_->CheckSmi(answer.reg());
- destination()->true_target()->Branch(is_smi);
- frame_->Spill(answer.reg());
- __ movq(answer.reg(), FieldOperand(answer.reg(), HeapObject::kMapOffset));
- __ CompareRoot(answer.reg(), Heap::kHeapNumberMapRootIndex);
- answer.Unuse();
- destination()->Split(equal);
-
- } else if (check->Equals(HEAP->string_symbol())) {
- Condition is_smi = masm_->CheckSmi(answer.reg());
- destination()->false_target()->Branch(is_smi);
-
- // It can be an undetectable string object.
- __ movq(kScratchRegister,
- FieldOperand(answer.reg(), HeapObject::kMapOffset));
- __ testb(FieldOperand(kScratchRegister, Map::kBitFieldOffset),
- Immediate(1 << Map::kIsUndetectable));
- destination()->false_target()->Branch(not_zero);
- __ CmpInstanceType(kScratchRegister, FIRST_NONSTRING_TYPE);
- answer.Unuse();
- destination()->Split(below); // Unsigned byte comparison needed.
-
- } else if (check->Equals(HEAP->boolean_symbol())) {
- __ CompareRoot(answer.reg(), Heap::kTrueValueRootIndex);
- destination()->true_target()->Branch(equal);
- __ CompareRoot(answer.reg(), Heap::kFalseValueRootIndex);
- answer.Unuse();
- destination()->Split(equal);
-
- } else if (check->Equals(HEAP->undefined_symbol())) {
- __ CompareRoot(answer.reg(), Heap::kUndefinedValueRootIndex);
- destination()->true_target()->Branch(equal);
-
- Condition is_smi = masm_->CheckSmi(answer.reg());
- destination()->false_target()->Branch(is_smi);
-
- // It can be an undetectable object.
- __ movq(kScratchRegister,
- FieldOperand(answer.reg(), HeapObject::kMapOffset));
- __ testb(FieldOperand(kScratchRegister, Map::kBitFieldOffset),
- Immediate(1 << Map::kIsUndetectable));
- answer.Unuse();
- destination()->Split(not_zero);
-
- } else if (check->Equals(HEAP->function_symbol())) {
- Condition is_smi = masm_->CheckSmi(answer.reg());
- destination()->false_target()->Branch(is_smi);
- frame_->Spill(answer.reg());
- __ CmpObjectType(answer.reg(), JS_FUNCTION_TYPE, answer.reg());
- destination()->true_target()->Branch(equal);
- // Regular expressions are callable so typeof == 'function'.
- __ CmpInstanceType(answer.reg(), JS_REGEXP_TYPE);
- answer.Unuse();
- destination()->Split(equal);
-
- } else if (check->Equals(HEAP->object_symbol())) {
- Condition is_smi = masm_->CheckSmi(answer.reg());
- destination()->false_target()->Branch(is_smi);
- __ CompareRoot(answer.reg(), Heap::kNullValueRootIndex);
- destination()->true_target()->Branch(equal);
-
- // Regular expressions are typeof == 'function', not 'object'.
- __ CmpObjectType(answer.reg(), JS_REGEXP_TYPE, kScratchRegister);
- destination()->false_target()->Branch(equal);
-
- // It can be an undetectable object.
- __ testb(FieldOperand(kScratchRegister, Map::kBitFieldOffset),
- Immediate(1 << Map::kIsUndetectable));
- destination()->false_target()->Branch(not_zero);
- __ CmpInstanceType(kScratchRegister, FIRST_JS_OBJECT_TYPE);
- destination()->false_target()->Branch(below);
- __ CmpInstanceType(kScratchRegister, LAST_JS_OBJECT_TYPE);
- answer.Unuse();
- destination()->Split(below_equal);
- } else {
- // Uncommon case: typeof testing against a string literal that is
- // never returned from the typeof operator.
- answer.Unuse();
- destination()->Goto(false);
- }
- return;
- }
-
- Condition cc = no_condition;
- bool strict = false;
- switch (op) {
- case Token::EQ_STRICT:
- strict = true;
- // Fall through
- case Token::EQ:
- cc = equal;
- break;
- case Token::LT:
- cc = less;
- break;
- case Token::GT:
- cc = greater;
- break;
- case Token::LTE:
- cc = less_equal;
- break;
- case Token::GTE:
- cc = greater_equal;
- break;
- case Token::IN: {
- Load(left);
- Load(right);
- Result answer = frame_->InvokeBuiltin(Builtins::IN, CALL_FUNCTION, 2);
- frame_->Push(&answer); // push the result
- return;
- }
- case Token::INSTANCEOF: {
- Load(left);
- Load(right);
- InstanceofStub stub(InstanceofStub::kNoFlags);
- Result answer = frame_->CallStub(&stub, 2);
- answer.ToRegister();
- __ testq(answer.reg(), answer.reg());
- answer.Unuse();
- destination()->Split(zero);
- return;
- }
- default:
- UNREACHABLE();
- }
-
- if (left->IsTrivial()) {
- Load(right);
- Result right_result = frame_->Pop();
- frame_->Push(left);
- frame_->Push(&right_result);
- } else {
- Load(left);
- Load(right);
- }
-
- Comparison(node, cc, strict, destination());
-}
-
-
-void CodeGenerator::VisitCompareToNull(CompareToNull* node) {
- Comment cmnt(masm_, "[ CompareToNull");
-
- Load(node->expression());
- Result operand = frame_->Pop();
- operand.ToRegister();
- __ CompareRoot(operand.reg(), Heap::kNullValueRootIndex);
- if (node->is_strict()) {
- operand.Unuse();
- destination()->Split(equal);
- } else {
- // The 'null' value is only equal to 'undefined' if using non-strict
- // comparisons.
- destination()->true_target()->Branch(equal);
- __ CompareRoot(operand.reg(), Heap::kUndefinedValueRootIndex);
- destination()->true_target()->Branch(equal);
- Condition is_smi = masm_->CheckSmi(operand.reg());
- destination()->false_target()->Branch(is_smi);
-
- // It can be an undetectable object.
- // Use a scratch register in preference to spilling operand.reg().
- Result temp = allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ movq(temp.reg(),
- FieldOperand(operand.reg(), HeapObject::kMapOffset));
- __ testb(FieldOperand(temp.reg(), Map::kBitFieldOffset),
- Immediate(1 << Map::kIsUndetectable));
- temp.Unuse();
- operand.Unuse();
- destination()->Split(not_zero);
- }
-}
-
-
-#ifdef DEBUG
-bool CodeGenerator::HasValidEntryRegisters() {
- return (allocator()->count(rax) == (frame()->is_used(rax) ? 1 : 0))
- && (allocator()->count(rbx) == (frame()->is_used(rbx) ? 1 : 0))
- && (allocator()->count(rcx) == (frame()->is_used(rcx) ? 1 : 0))
- && (allocator()->count(rdx) == (frame()->is_used(rdx) ? 1 : 0))
- && (allocator()->count(rdi) == (frame()->is_used(rdi) ? 1 : 0))
- && (allocator()->count(r8) == (frame()->is_used(r8) ? 1 : 0))
- && (allocator()->count(r9) == (frame()->is_used(r9) ? 1 : 0))
- && (allocator()->count(r11) == (frame()->is_used(r11) ? 1 : 0))
- && (allocator()->count(r14) == (frame()->is_used(r14) ? 1 : 0))
- && (allocator()->count(r15) == (frame()->is_used(r15) ? 1 : 0));
-}
-#endif
-
-
-
-// Emit a LoadIC call to get the value from receiver and leave it in
-// dst. The receiver register is restored after the call.
-class DeferredReferenceGetNamedValue: public DeferredCode {
- public:
- DeferredReferenceGetNamedValue(Register dst,
- Register receiver,
- Handle<String> name)
- : dst_(dst), receiver_(receiver), name_(name) {
- set_comment("[ DeferredReferenceGetNamedValue");
- }
-
- virtual void Generate();
-
- Label* patch_site() { return &patch_site_; }
-
- private:
- Label patch_site_;
- Register dst_;
- Register receiver_;
- Handle<String> name_;
-};
-
-
-void DeferredReferenceGetNamedValue::Generate() {
- if (!receiver_.is(rax)) {
- __ movq(rax, receiver_);
- }
- __ Move(rcx, name_);
- Handle<Code> ic = Isolate::Current()->builtins()->LoadIC_Initialize();
- __ Call(ic, RelocInfo::CODE_TARGET);
- // The call must be followed by a test rax instruction to indicate
- // that the inobject property case was inlined.
- //
- // Store the delta to the map check instruction here in the test
- // instruction. Use masm_-> instead of the __ macro since the
- // latter can't return a value.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site());
- // Here we use masm_-> instead of the __ macro because this is the
- // instruction that gets patched and coverage code gets in the way.
- masm_->testl(rax, Immediate(-delta_to_patch_site));
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->named_load_inline_miss(), 1);
-
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-class DeferredReferenceGetKeyedValue: public DeferredCode {
- public:
- explicit DeferredReferenceGetKeyedValue(Register dst,
- Register receiver,
- Register key)
- : dst_(dst), receiver_(receiver), key_(key) {
- set_comment("[ DeferredReferenceGetKeyedValue");
- }
-
- virtual void Generate();
-
- Label* patch_site() { return &patch_site_; }
-
- private:
- Label patch_site_;
- Register dst_;
- Register receiver_;
- Register key_;
-};
-
-
-void DeferredReferenceGetKeyedValue::Generate() {
- if (receiver_.is(rdx)) {
- if (!key_.is(rax)) {
- __ movq(rax, key_);
- } // else do nothing.
- } else if (receiver_.is(rax)) {
- if (key_.is(rdx)) {
- __ xchg(rax, rdx);
- } else if (key_.is(rax)) {
- __ movq(rdx, receiver_);
- } else {
- __ movq(rdx, receiver_);
- __ movq(rax, key_);
- }
- } else if (key_.is(rax)) {
- __ movq(rdx, receiver_);
- } else {
- __ movq(rax, key_);
- __ movq(rdx, receiver_);
- }
- // Calculate the delta from the IC call instruction to the map check
- // movq instruction in the inlined version. This delta is stored in
- // a test(rax, delta) instruction after the call so that we can find
- // it in the IC initialization code and patch the movq instruction.
- // This means that we cannot allow test instructions after calls to
- // KeyedLoadIC stubs in other places.
- Handle<Code> ic = Isolate::Current()->builtins()->KeyedLoadIC_Initialize();
- __ Call(ic, RelocInfo::CODE_TARGET);
- // The delta from the start of the map-compare instruction to the
- // test instruction. We use masm_-> directly here instead of the __
- // macro because the macro sometimes uses macro expansion to turn
- // into something that can't return a value. This is encountered
- // when doing generated code coverage tests.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site());
- // Here we use masm_-> instead of the __ macro because this is the
- // instruction that gets patched and coverage code gets in the way.
- // TODO(X64): Consider whether it's worth switching the test to a
- // 7-byte NOP with non-zero immediate (0f 1f 80 xxxxxxxx) which won't
- // be generated normally.
- masm_->testl(rax, Immediate(-delta_to_patch_site));
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->keyed_load_inline_miss(), 1);
-
- if (!dst_.is(rax)) __ movq(dst_, rax);
-}
-
-
-class DeferredReferenceSetKeyedValue: public DeferredCode {
- public:
- DeferredReferenceSetKeyedValue(Register value,
- Register key,
- Register receiver,
- StrictModeFlag strict_mode)
- : value_(value),
- key_(key),
- receiver_(receiver),
- strict_mode_(strict_mode) {
- set_comment("[ DeferredReferenceSetKeyedValue");
- }
-
- virtual void Generate();
-
- Label* patch_site() { return &patch_site_; }
-
- private:
- Register value_;
- Register key_;
- Register receiver_;
- Label patch_site_;
- StrictModeFlag strict_mode_;
-};
-
-
-void DeferredReferenceSetKeyedValue::Generate() {
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->keyed_store_inline_miss(), 1);
- // Move value, receiver, and key to registers rax, rdx, and rcx, as
- // the IC stub expects.
- // Move value to rax, using xchg if the receiver or key is in rax.
- if (!value_.is(rax)) {
- if (!receiver_.is(rax) && !key_.is(rax)) {
- __ movq(rax, value_);
- } else {
- __ xchg(rax, value_);
- // Update receiver_ and key_ if they are affected by the swap.
- if (receiver_.is(rax)) {
- receiver_ = value_;
- } else if (receiver_.is(value_)) {
- receiver_ = rax;
- }
- if (key_.is(rax)) {
- key_ = value_;
- } else if (key_.is(value_)) {
- key_ = rax;
- }
- }
- }
- // Value is now in rax. Its original location is remembered in value_,
- // and the value is restored to value_ before returning.
- // The variables receiver_ and key_ are not preserved.
- // Move receiver and key to rdx and rcx, swapping if necessary.
- if (receiver_.is(rdx)) {
- if (!key_.is(rcx)) {
- __ movq(rcx, key_);
- } // Else everything is already in the right place.
- } else if (receiver_.is(rcx)) {
- if (key_.is(rdx)) {
- __ xchg(rcx, rdx);
- } else if (key_.is(rcx)) {
- __ movq(rdx, receiver_);
- } else {
- __ movq(rdx, receiver_);
- __ movq(rcx, key_);
- }
- } else if (key_.is(rcx)) {
- __ movq(rdx, receiver_);
- } else {
- __ movq(rcx, key_);
- __ movq(rdx, receiver_);
- }
-
- // Call the IC stub.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode_ == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict
- : Builtins::kKeyedStoreIC_Initialize));
- __ Call(ic, RelocInfo::CODE_TARGET);
- // The delta from the start of the map-compare instructions (initial movq)
- // to the test instruction. We use masm_-> directly here instead of the
- // __ macro because the macro sometimes uses macro expansion to turn
- // into something that can't return a value. This is encountered
- // when doing generated code coverage tests.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(patch_site());
- // Here we use masm_-> instead of the __ macro because this is the
- // instruction that gets patched and coverage code gets in the way.
- masm_->testl(rax, Immediate(-delta_to_patch_site));
- // Restore value (returned from store IC).
- if (!value_.is(rax)) __ movq(value_, rax);
-}
-
-
-Result CodeGenerator::EmitNamedLoad(Handle<String> name, bool is_contextual) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Result result;
- // Do not inline the inobject property case for loads from the global
- // object. Also do not inline for unoptimized code. This saves time
- // in the code generator. Unoptimized code is toplevel code or code
- // that is not in a loop.
- if (is_contextual || scope()->is_global_scope() || loop_nesting() == 0) {
- Comment cmnt(masm(), "[ Load from named Property");
- frame()->Push(name);
-
- RelocInfo::Mode mode = is_contextual
- ? RelocInfo::CODE_TARGET_CONTEXT
- : RelocInfo::CODE_TARGET;
- result = frame()->CallLoadIC(mode);
- // A test rax instruction following the call signals that the
- // inobject property case was inlined. Ensure that there is not
- // a test rax instruction here.
- __ nop();
- } else {
- // Inline the inobject property case.
- Comment cmnt(masm(), "[ Inlined named property load");
- Result receiver = frame()->Pop();
- receiver.ToRegister();
- result = allocator()->Allocate();
- ASSERT(result.is_valid());
-
- // r12 is now a reserved register, so it cannot be the receiver.
- // If it was, the distance to the fixup location would not be constant.
- ASSERT(!receiver.reg().is(r12));
-
- DeferredReferenceGetNamedValue* deferred =
- new DeferredReferenceGetNamedValue(result.reg(), receiver.reg(), name);
-
- // Check that the receiver is a heap object.
- __ JumpIfSmi(receiver.reg(), deferred->entry_label());
-
- __ bind(deferred->patch_site());
- // This is the map check instruction that will be patched (so we can't
- // use the double underscore macro that may insert instructions).
- // Initially use an invalid map to force a failure.
- masm()->movq(kScratchRegister, FACTORY->null_value(),
- RelocInfo::EMBEDDED_OBJECT);
- masm()->cmpq(FieldOperand(receiver.reg(), HeapObject::kMapOffset),
- kScratchRegister);
- // This branch is always a forwards branch so it's always a fixed
- // size which allows the assert below to succeed and patching to work.
- // Don't use deferred->Branch(...), since that might add coverage code.
- masm()->j(not_equal, deferred->entry_label());
-
- // The delta from the patch label to the load offset must be
- // statically known.
- ASSERT(masm()->SizeOfCodeGeneratedSince(deferred->patch_site()) ==
- LoadIC::kOffsetToLoadInstruction);
- // The initial (invalid) offset has to be large enough to force
- // a 32-bit instruction encoding to allow patching with an
- // arbitrary offset. Use kMaxInt (minus kHeapObjectTag).
- int offset = kMaxInt;
- masm()->movq(result.reg(), FieldOperand(receiver.reg(), offset));
-
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->named_load_inline(), 1);
- deferred->BindExit();
- }
- ASSERT(frame()->height() == original_height - 1);
- return result;
-}
-
-
-Result CodeGenerator::EmitNamedStore(Handle<String> name, bool is_contextual) {
-#ifdef DEBUG
- int expected_height = frame()->height() - (is_contextual ? 1 : 2);
-#endif
-
- Result result;
- if (is_contextual || scope()->is_global_scope() || loop_nesting() == 0) {
- result = frame()->CallStoreIC(name, is_contextual, strict_mode_flag());
- // A test rax instruction following the call signals that the inobject
- // property case was inlined. Ensure that there is not a test rax
- // instruction here.
- __ nop();
- } else {
- // Inline the in-object property case.
- JumpTarget slow, done;
- Label patch_site;
-
- // Get the value and receiver from the stack.
- Result value = frame()->Pop();
- value.ToRegister();
- Result receiver = frame()->Pop();
- receiver.ToRegister();
-
- // Allocate result register.
- result = allocator()->Allocate();
- ASSERT(result.is_valid() && receiver.is_valid() && value.is_valid());
-
- // r12 is now a reserved register, so it cannot be the receiver.
- // If it was, the distance to the fixup location would not be constant.
- ASSERT(!receiver.reg().is(r12));
-
- // Check that the receiver is a heap object.
- Condition is_smi = masm()->CheckSmi(receiver.reg());
- slow.Branch(is_smi, &value, &receiver);
-
- // This is the map check instruction that will be patched.
- // Initially use an invalid map to force a failure. The exact
- // instruction sequence is important because we use the
- // kOffsetToStoreInstruction constant for patching. We avoid using
- // the __ macro for the following two instructions because it
- // might introduce extra instructions.
- __ bind(&patch_site);
- masm()->movq(kScratchRegister, FACTORY->null_value(),
- RelocInfo::EMBEDDED_OBJECT);
- masm()->cmpq(FieldOperand(receiver.reg(), HeapObject::kMapOffset),
- kScratchRegister);
- // This branch is always a forwards branch so it's always a fixed size
- // which allows the assert below to succeed and patching to work.
- slow.Branch(not_equal, &value, &receiver);
-
- // The delta from the patch label to the store offset must be
- // statically known.
- ASSERT(masm()->SizeOfCodeGeneratedSince(&patch_site) ==
- StoreIC::kOffsetToStoreInstruction);
-
- // The initial (invalid) offset has to be large enough to force a 32-bit
- // instruction encoding to allow patching with an arbitrary offset. Use
- // kMaxInt (minus kHeapObjectTag).
- int offset = kMaxInt;
- __ movq(FieldOperand(receiver.reg(), offset), value.reg());
- __ movq(result.reg(), value.reg());
-
- // Allocate scratch register for write barrier.
- Result scratch = allocator()->Allocate();
- ASSERT(scratch.is_valid());
-
- // The write barrier clobbers all input registers, so spill the
- // receiver and the value.
- frame_->Spill(receiver.reg());
- frame_->Spill(value.reg());
-
- // If the receiver and the value share a register allocate a new
- // register for the receiver.
- if (receiver.reg().is(value.reg())) {
- receiver = allocator()->Allocate();
- ASSERT(receiver.is_valid());
- __ movq(receiver.reg(), value.reg());
- }
-
- // Update the write barrier. To save instructions in the inlined
- // version we do not filter smis.
- Label skip_write_barrier;
- __ InNewSpace(receiver.reg(), value.reg(), equal, &skip_write_barrier);
- int delta_to_record_write = masm_->SizeOfCodeGeneratedSince(&patch_site);
- __ lea(scratch.reg(), Operand(receiver.reg(), offset));
- __ RecordWriteHelper(receiver.reg(), scratch.reg(), value.reg());
- if (FLAG_debug_code) {
- __ movq(receiver.reg(), BitCast<int64_t>(kZapValue), RelocInfo::NONE);
- __ movq(value.reg(), BitCast<int64_t>(kZapValue), RelocInfo::NONE);
- __ movq(scratch.reg(), BitCast<int64_t>(kZapValue), RelocInfo::NONE);
- }
- __ bind(&skip_write_barrier);
- value.Unuse();
- scratch.Unuse();
- receiver.Unuse();
- done.Jump(&result);
-
- slow.Bind(&value, &receiver);
- frame()->Push(&receiver);
- frame()->Push(&value);
- result = frame()->CallStoreIC(name, is_contextual, strict_mode_flag());
- // Encode the offset to the map check instruction and the offset
- // to the write barrier store address computation in a test rax
- // instruction.
- int delta_to_patch_site = masm_->SizeOfCodeGeneratedSince(&patch_site);
- __ testl(rax,
- Immediate((delta_to_record_write << 16) | delta_to_patch_site));
- done.Bind(&result);
- }
-
- ASSERT_EQ(expected_height, frame()->height());
- return result;
-}
-
-
-Result CodeGenerator::EmitKeyedLoad() {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Result result;
- // Inline array load code if inside of a loop. We do not know
- // the receiver map yet, so we initially generate the code with
- // a check against an invalid map. In the inline cache code, we
- // patch the map check if appropriate.
- if (loop_nesting() > 0) {
- Comment cmnt(masm_, "[ Inlined load from keyed Property");
-
- // Use a fresh temporary to load the elements without destroying
- // the receiver which is needed for the deferred slow case.
- // Allocate the temporary early so that we use rax if it is free.
- Result elements = allocator()->Allocate();
- ASSERT(elements.is_valid());
-
- Result key = frame_->Pop();
- Result receiver = frame_->Pop();
- key.ToRegister();
- receiver.ToRegister();
-
- // If key and receiver are shared registers on the frame, their values will
- // be automatically saved and restored when going to deferred code.
- // The result is returned in elements, which is not shared.
- DeferredReferenceGetKeyedValue* deferred =
- new DeferredReferenceGetKeyedValue(elements.reg(),
- receiver.reg(),
- key.reg());
-
- __ JumpIfSmi(receiver.reg(), deferred->entry_label());
-
- // Check that the receiver has the expected map.
- // Initially, use an invalid map. The map is patched in the IC
- // initialization code.
- __ bind(deferred->patch_site());
- // Use masm-> here instead of the double underscore macro since extra
- // coverage code can interfere with the patching. Do not use a load
- // from the root array to load null_value, since the load must be patched
- // with the expected receiver map, which is not in the root array.
- masm_->movq(kScratchRegister, FACTORY->null_value(),
- RelocInfo::EMBEDDED_OBJECT);
- masm_->cmpq(FieldOperand(receiver.reg(), HeapObject::kMapOffset),
- kScratchRegister);
- deferred->Branch(not_equal);
-
- __ JumpUnlessNonNegativeSmi(key.reg(), deferred->entry_label());
-
- // Get the elements array from the receiver.
- __ movq(elements.reg(),
- FieldOperand(receiver.reg(), JSObject::kElementsOffset));
- __ AssertFastElements(elements.reg());
-
- // Check that key is within bounds.
- __ SmiCompare(key.reg(),
- FieldOperand(elements.reg(), FixedArray::kLengthOffset));
- deferred->Branch(above_equal);
-
- // Load and check that the result is not the hole. We could
- // reuse the index or elements register for the value.
- //
- // TODO(206): Consider whether it makes sense to try some
- // heuristic about which register to reuse. For example, if
- // one is rax, the we can reuse that one because the value
- // coming from the deferred code will be in rax.
- SmiIndex index =
- masm_->SmiToIndex(kScratchRegister, key.reg(), kPointerSizeLog2);
- __ movq(elements.reg(),
- FieldOperand(elements.reg(),
- index.reg,
- index.scale,
- FixedArray::kHeaderSize));
- result = elements;
- __ CompareRoot(result.reg(), Heap::kTheHoleValueRootIndex);
- deferred->Branch(equal);
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->keyed_load_inline(), 1);
-
- deferred->BindExit();
- } else {
- Comment cmnt(masm_, "[ Load from keyed Property");
- result = frame_->CallKeyedLoadIC(RelocInfo::CODE_TARGET);
- // Make sure that we do not have a test instruction after the
- // call. A test instruction after the call is used to
- // indicate that we have generated an inline version of the
- // keyed load. The explicit nop instruction is here because
- // the push that follows might be peep-hole optimized away.
- __ nop();
- }
- ASSERT(frame()->height() == original_height - 2);
- return result;
-}
-
-
-Result CodeGenerator::EmitKeyedStore(StaticType* key_type) {
-#ifdef DEBUG
- int original_height = frame()->height();
-#endif
- Result result;
- // Generate inlined version of the keyed store if the code is in a loop
- // and the key is likely to be a smi.
- if (loop_nesting() > 0 && key_type->IsLikelySmi()) {
- Comment cmnt(masm(), "[ Inlined store to keyed Property");
-
- // Get the receiver, key and value into registers.
- result = frame()->Pop();
- Result key = frame()->Pop();
- Result receiver = frame()->Pop();
-
- Result tmp = allocator_->Allocate();
- ASSERT(tmp.is_valid());
- Result tmp2 = allocator_->Allocate();
- ASSERT(tmp2.is_valid());
-
- // Determine whether the value is a constant before putting it in a
- // register.
- bool value_is_constant = result.is_constant();
-
- // Make sure that value, key and receiver are in registers.
- result.ToRegister();
- key.ToRegister();
- receiver.ToRegister();
-
- DeferredReferenceSetKeyedValue* deferred =
- new DeferredReferenceSetKeyedValue(result.reg(),
- key.reg(),
- receiver.reg(),
- strict_mode_flag());
-
- // Check that the receiver is not a smi.
- __ JumpIfSmi(receiver.reg(), deferred->entry_label());
-
- // Check that the key is a smi.
- if (!key.is_smi()) {
- __ JumpIfNotSmi(key.reg(), deferred->entry_label());
- } else if (FLAG_debug_code) {
- __ AbortIfNotSmi(key.reg());
- }
-
- // Check that the receiver is a JSArray.
- __ CmpObjectType(receiver.reg(), JS_ARRAY_TYPE, kScratchRegister);
- deferred->Branch(not_equal);
-
- // Get the elements array from the receiver and check that it is not a
- // dictionary.
- __ movq(tmp.reg(),
- FieldOperand(receiver.reg(), JSArray::kElementsOffset));
-
- // Check whether it is possible to omit the write barrier. If the elements
- // array is in new space or the value written is a smi we can safely update
- // the elements array without write barrier.
- Label in_new_space;
- __ InNewSpace(tmp.reg(), tmp2.reg(), equal, &in_new_space);
- if (!value_is_constant) {
- __ JumpIfNotSmi(result.reg(), deferred->entry_label());
- }
-
- __ bind(&in_new_space);
- // Bind the deferred code patch site to be able to locate the fixed
- // array map comparison. When debugging, we patch this comparison to
- // always fail so that we will hit the IC call in the deferred code
- // which will allow the debugger to break for fast case stores.
- __ bind(deferred->patch_site());
- // Avoid using __ to ensure the distance from patch_site
- // to the map address is always the same.
- masm()->movq(kScratchRegister, FACTORY->fixed_array_map(),
- RelocInfo::EMBEDDED_OBJECT);
- __ cmpq(FieldOperand(tmp.reg(), HeapObject::kMapOffset),
- kScratchRegister);
- deferred->Branch(not_equal);
-
- // Check that the key is within bounds. Both the key and the length of
- // the JSArray are smis (because the fixed array check above ensures the
- // elements are in fast case). Use unsigned comparison to handle negative
- // keys.
- __ SmiCompare(FieldOperand(receiver.reg(), JSArray::kLengthOffset),
- key.reg());
- deferred->Branch(below_equal);
-
- // Store the value.
- SmiIndex index =
- masm()->SmiToIndex(kScratchRegister, key.reg(), kPointerSizeLog2);
- __ movq(FieldOperand(tmp.reg(),
- index.reg,
- index.scale,
- FixedArray::kHeaderSize),
- result.reg());
- Counters* counters = masm()->isolate()->counters();
- __ IncrementCounter(counters->keyed_store_inline(), 1);
-
- deferred->BindExit();
- } else {
- result = frame()->CallKeyedStoreIC(strict_mode_flag());
- // Make sure that we do not have a test instruction after the
- // call. A test instruction after the call is used to
- // indicate that we have generated an inline version of the
- // keyed store.
- __ nop();
- }
- ASSERT(frame()->height() == original_height - 3);
- return result;
-}
-
-
-#undef __
-#define __ ACCESS_MASM(masm)
-
-
-Handle<String> Reference::GetName() {
- ASSERT(type_ == NAMED);
- Property* property = expression_->AsProperty();
- if (property == NULL) {
- // Global variable reference treated as a named property reference.
- VariableProxy* proxy = expression_->AsVariableProxy();
- ASSERT(proxy->AsVariable() != NULL);
- ASSERT(proxy->AsVariable()->is_global());
- return proxy->name();
- } else {
- Literal* raw_name = property->key()->AsLiteral();
- ASSERT(raw_name != NULL);
- return Handle<String>(String::cast(*raw_name->handle()));
- }
-}
-
-
-void Reference::GetValue() {
- ASSERT(!cgen_->in_spilled_code());
- ASSERT(cgen_->HasValidEntryRegisters());
- ASSERT(!is_illegal());
- MacroAssembler* masm = cgen_->masm();
-
- // Record the source position for the property load.
- Property* property = expression_->AsProperty();
- if (property != NULL) {
- cgen_->CodeForSourcePosition(property->position());
- }
-
- switch (type_) {
- case SLOT: {
- Comment cmnt(masm, "[ Load from Slot");
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- cgen_->LoadFromSlotCheckForArguments(slot, NOT_INSIDE_TYPEOF);
- break;
- }
-
- case NAMED: {
- Variable* var = expression_->AsVariableProxy()->AsVariable();
- bool is_global = var != NULL;
- ASSERT(!is_global || var->is_global());
- if (persist_after_get_) {
- cgen_->frame()->Dup();
- }
- Result result = cgen_->EmitNamedLoad(GetName(), is_global);
- cgen_->frame()->Push(&result);
- break;
- }
-
- case KEYED: {
- // A load of a bare identifier (load from global) cannot be keyed.
- ASSERT(expression_->AsVariableProxy()->AsVariable() == NULL);
- if (persist_after_get_) {
- cgen_->frame()->PushElementAt(1);
- cgen_->frame()->PushElementAt(1);
- }
- Result value = cgen_->EmitKeyedLoad();
- cgen_->frame()->Push(&value);
- break;
- }
-
- default:
- UNREACHABLE();
- }
-
- if (!persist_after_get_) {
- set_unloaded();
- }
-}
-
-
-void Reference::TakeValue() {
- // TODO(X64): This function is completely architecture independent. Move
- // it somewhere shared.
-
- // For non-constant frame-allocated slots, we invalidate the value in the
- // slot. For all others, we fall back on GetValue.
- ASSERT(!cgen_->in_spilled_code());
- ASSERT(!is_illegal());
- if (type_ != SLOT) {
- GetValue();
- return;
- }
-
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- if (slot->type() == Slot::LOOKUP ||
- slot->type() == Slot::CONTEXT ||
- slot->var()->mode() == Variable::CONST ||
- slot->is_arguments()) {
- GetValue();
- return;
- }
-
- // Only non-constant, frame-allocated parameters and locals can reach
- // here. Be careful not to use the optimizations for arguments
- // object access since it may not have been initialized yet.
- ASSERT(!slot->is_arguments());
- if (slot->type() == Slot::PARAMETER) {
- cgen_->frame()->TakeParameterAt(slot->index());
- } else {
- ASSERT(slot->type() == Slot::LOCAL);
- cgen_->frame()->TakeLocalAt(slot->index());
- }
-
- ASSERT(persist_after_get_);
- // Do not unload the reference, because it is used in SetValue.
-}
-
-
-void Reference::SetValue(InitState init_state) {
- ASSERT(cgen_->HasValidEntryRegisters());
- ASSERT(!is_illegal());
- MacroAssembler* masm = cgen_->masm();
- switch (type_) {
- case SLOT: {
- Comment cmnt(masm, "[ Store to Slot");
- Slot* slot = expression_->AsVariableProxy()->AsVariable()->AsSlot();
- ASSERT(slot != NULL);
- cgen_->StoreToSlot(slot, init_state);
- set_unloaded();
- break;
- }
-
- case NAMED: {
- Comment cmnt(masm, "[ Store to named Property");
- Result answer = cgen_->EmitNamedStore(GetName(), false);
- cgen_->frame()->Push(&answer);
- set_unloaded();
- break;
- }
-
- case KEYED: {
- Comment cmnt(masm, "[ Store to keyed Property");
- Property* property = expression()->AsProperty();
- ASSERT(property != NULL);
-
- Result answer = cgen_->EmitKeyedStore(property->key()->type());
- cgen_->frame()->Push(&answer);
- set_unloaded();
- break;
- }
-
- case UNLOADED:
- case ILLEGAL:
- UNREACHABLE();
- }
-}
-
-
-Result CodeGenerator::GenerateGenericBinaryOpStubCall(GenericBinaryOpStub* stub,
- Result* left,
- Result* right) {
- if (stub->ArgsInRegistersSupported()) {
- stub->SetArgsInRegisters();
- return frame_->CallStub(stub, left, right);
- } else {
- frame_->Push(left);
- frame_->Push(right);
- return frame_->CallStub(stub, 2);
- }
-}
-
-#undef __
-
#define __ masm.
#ifdef _WIN64
#include "ast.h"
#include "ic-inl.h"
-#include "jump-target-heavy.h"
namespace v8 {
namespace internal {
// Forward declarations
class CompilationInfo;
-class DeferredCode;
-class RegisterAllocator;
-class RegisterFile;
-enum InitState { CONST_INIT, NOT_CONST_INIT };
enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
// -------------------------------------------------------------------------
-// Reference support
-
-// A reference is a C++ stack-allocated object that puts a
-// reference on the virtual frame. The reference may be consumed
-// by GetValue, TakeValue, SetValue, and Codegen::UnloadReference.
-// When the lifetime (scope) of a valid reference ends, it must have
-// been consumed, and be in state UNLOADED.
-class Reference BASE_EMBEDDED {
- public:
- // The values of the types is important, see size().
- enum Type { UNLOADED = -2, ILLEGAL = -1, SLOT = 0, NAMED = 1, KEYED = 2 };
-
- Reference(CodeGenerator* cgen,
- Expression* expression,
- bool persist_after_get = false);
- ~Reference();
-
- Expression* expression() const { return expression_; }
- Type type() const { return type_; }
- void set_type(Type value) {
- ASSERT_EQ(ILLEGAL, type_);
- type_ = value;
- }
-
- void set_unloaded() {
- ASSERT_NE(ILLEGAL, type_);
- ASSERT_NE(UNLOADED, type_);
- type_ = UNLOADED;
- }
- // The size the reference takes up on the stack.
- int size() const {
- return (type_ < SLOT) ? 0 : type_;
- }
-
- bool is_illegal() const { return type_ == ILLEGAL; }
- bool is_slot() const { return type_ == SLOT; }
- bool is_property() const { return type_ == NAMED || type_ == KEYED; }
- bool is_unloaded() const { return type_ == UNLOADED; }
-
- // Return the name. Only valid for named property references.
- Handle<String> GetName();
-
- // Generate code to push the value of the reference on top of the
- // expression stack. The reference is expected to be already on top of
- // the expression stack, and it is consumed by the call unless the
- // reference is for a compound assignment.
- // If the reference is not consumed, it is left in place under its value.
- void GetValue();
-
- // Like GetValue except that the slot is expected to be written to before
- // being read from again. The value of the reference may be invalidated,
- // causing subsequent attempts to read it to fail.
- void TakeValue();
-
- // Generate code to store the value on top of the expression stack in the
- // reference. The reference is expected to be immediately below the value
- // on the expression stack. The value is stored in the location specified
- // by the reference, and is left on top of the stack, after the reference
- // is popped from beneath it (unloaded).
- void SetValue(InitState init_state);
-
- private:
- CodeGenerator* cgen_;
- Expression* expression_;
- Type type_;
- bool persist_after_get_;
-};
-
-
-// -------------------------------------------------------------------------
-// Control destinations.
-
-// A control destination encapsulates a pair of jump targets and a
-// flag indicating which one is the preferred fall-through. The
-// preferred fall-through must be unbound, the other may be already
-// bound (ie, a backward target).
-//
-// The true and false targets may be jumped to unconditionally or
-// control may split conditionally. Unconditional jumping and
-// splitting should be emitted in tail position (as the last thing
-// when compiling an expression) because they can cause either label
-// to be bound or the non-fall through to be jumped to leaving an
-// invalid virtual frame.
-//
-// The labels in the control destination can be extracted and
-// manipulated normally without affecting the state of the
-// destination.
-
-class ControlDestination BASE_EMBEDDED {
- public:
- ControlDestination(JumpTarget* true_target,
- JumpTarget* false_target,
- bool true_is_fall_through)
- : true_target_(true_target),
- false_target_(false_target),
- true_is_fall_through_(true_is_fall_through),
- is_used_(false) {
- ASSERT(true_is_fall_through ? !true_target->is_bound()
- : !false_target->is_bound());
- }
-
- // Accessors for the jump targets. Directly jumping or branching to
- // or binding the targets will not update the destination's state.
- JumpTarget* true_target() const { return true_target_; }
- JumpTarget* false_target() const { return false_target_; }
-
- // True if the the destination has been jumped to unconditionally or
- // control has been split to both targets. This predicate does not
- // test whether the targets have been extracted and manipulated as
- // raw jump targets.
- bool is_used() const { return is_used_; }
-
- // True if the destination is used and the true target (respectively
- // false target) was the fall through. If the target is backward,
- // "fall through" included jumping unconditionally to it.
- bool true_was_fall_through() const {
- return is_used_ && true_is_fall_through_;
- }
-
- bool false_was_fall_through() const {
- return is_used_ && !true_is_fall_through_;
- }
-
- // Emit a branch to one of the true or false targets, and bind the
- // other target. Because this binds the fall-through target, it
- // should be emitted in tail position (as the last thing when
- // compiling an expression).
- void Split(Condition cc) {
- ASSERT(!is_used_);
- if (true_is_fall_through_) {
- false_target_->Branch(NegateCondition(cc));
- true_target_->Bind();
- } else {
- true_target_->Branch(cc);
- false_target_->Bind();
- }
- is_used_ = true;
- }
-
- // Emit an unconditional jump in tail position, to the true target
- // (if the argument is true) or the false target. The "jump" will
- // actually bind the jump target if it is forward, jump to it if it
- // is backward.
- void Goto(bool where) {
- ASSERT(!is_used_);
- JumpTarget* target = where ? true_target_ : false_target_;
- if (target->is_bound()) {
- target->Jump();
- } else {
- target->Bind();
- }
- is_used_ = true;
- true_is_fall_through_ = where;
- }
-
- // Mark this jump target as used as if Goto had been called, but
- // without generating a jump or binding a label (the control effect
- // should have already happened). This is used when the left
- // subexpression of the short-circuit boolean operators are
- // compiled.
- void Use(bool where) {
- ASSERT(!is_used_);
- ASSERT((where ? true_target_ : false_target_)->is_bound());
- is_used_ = true;
- true_is_fall_through_ = where;
- }
-
- // Swap the true and false targets but keep the same actual label as
- // the fall through. This is used when compiling negated
- // expressions, where we want to swap the targets but preserve the
- // state.
- void Invert() {
- JumpTarget* temp_target = true_target_;
- true_target_ = false_target_;
- false_target_ = temp_target;
-
- true_is_fall_through_ = !true_is_fall_through_;
- }
-
- private:
- // True and false jump targets.
- JumpTarget* true_target_;
- JumpTarget* false_target_;
-
- // Before using the destination: true if the true target is the
- // preferred fall through, false if the false target is. After
- // using the destination: true if the true target was actually used
- // as the fall through, false if the false target was.
- bool true_is_fall_through_;
-
- // True if the Split or Goto functions have been called.
- bool is_used_;
-};
-
-
-// -------------------------------------------------------------------------
-// Code generation state
-
-// The state is passed down the AST by the code generator (and back up, in
-// the form of the state of the jump target pair). It is threaded through
-// the call stack. Constructing a state implicitly pushes it on the owning
-// code generator's stack of states, and destroying one implicitly pops it.
-//
-// The code generator state is only used for expressions, so statements have
-// the initial state.
-
-class CodeGenState BASE_EMBEDDED {
- public:
- // Create an initial code generator state. Destroying the initial state
- // leaves the code generator with a NULL state.
- explicit CodeGenState(CodeGenerator* owner);
-
- // Create a code generator state based on a code generator's current
- // state. The new state has its own control destination.
- CodeGenState(CodeGenerator* owner, ControlDestination* destination);
-
- // Destroy a code generator state and restore the owning code generator's
- // previous state.
- ~CodeGenState();
-
- // Accessors for the state.
- ControlDestination* destination() const { return destination_; }
-
- private:
- // The owning code generator.
- CodeGenerator* owner_;
-
- // A control destination in case the expression has a control-flow
- // effect.
- ControlDestination* destination_;
-
- // The previous state of the owning code generator, restored when
- // this state is destroyed.
- CodeGenState* previous_;
-};
-
-
-// -------------------------------------------------------------------------
-// Arguments allocation mode
-
-enum ArgumentsAllocationMode {
- NO_ARGUMENTS_ALLOCATION,
- EAGER_ARGUMENTS_ALLOCATION,
- LAZY_ARGUMENTS_ALLOCATION
-};
-
-
-// -------------------------------------------------------------------------
// CodeGenerator
class CodeGenerator: public AstVisitor {
int pos,
bool right_here = false);
- // Accessors
- MacroAssembler* masm() { return masm_; }
- VirtualFrame* frame() const { return frame_; }
- inline Handle<Script> script();
-
- bool has_valid_frame() const { return frame_ != NULL; }
-
- // Set the virtual frame to be new_frame, with non-frame register
- // reference counts given by non_frame_registers. The non-frame
- // register reference counts of the old frame are returned in
- // non_frame_registers.
- void SetFrame(VirtualFrame* new_frame, RegisterFile* non_frame_registers);
-
- void DeleteFrame();
-
- RegisterAllocator* allocator() const { return allocator_; }
-
- CodeGenState* state() { return state_; }
- void set_state(CodeGenState* state) { state_ = state; }
-
- void AddDeferred(DeferredCode* code) { deferred_.Add(code); }
-
- bool in_spilled_code() const { return in_spilled_code_; }
- void set_in_spilled_code(bool flag) { in_spilled_code_ = flag; }
-
private:
- // Type of a member function that generates inline code for a native function.
- typedef void (CodeGenerator::*InlineFunctionGenerator)
- (ZoneList<Expression*>*);
-
- static const InlineFunctionGenerator kInlineFunctionGenerators[];
-
- // Construction/Destruction
- explicit CodeGenerator(MacroAssembler* masm);
-
- // Accessors
- inline bool is_eval();
- inline Scope* scope();
- inline bool is_strict_mode();
- inline StrictModeFlag strict_mode_flag();
-
- // Generating deferred code.
- void ProcessDeferred();
-
- // State
- ControlDestination* destination() const { return state_->destination(); }
-
- // Track loop nesting level.
- int loop_nesting() const { return loop_nesting_; }
- void IncrementLoopNesting() { loop_nesting_++; }
- void DecrementLoopNesting() { loop_nesting_--; }
-
-
- // Node visitors.
- void VisitStatements(ZoneList<Statement*>* statements);
-
- virtual void VisitSlot(Slot* node);
-#define DEF_VISIT(type) \
- virtual void Visit##type(type* node);
- AST_NODE_LIST(DEF_VISIT)
-#undef DEF_VISIT
-
- // Visit a statement and then spill the virtual frame if control flow can
- // reach the end of the statement (ie, it does not exit via break,
- // continue, return, or throw). This function is used temporarily while
- // the code generator is being transformed.
- void VisitAndSpill(Statement* statement);
-
- // Visit a list of statements and then spill the virtual frame if control
- // flow can reach the end of the list.
- void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
-
- // Main code generation function
- void Generate(CompilationInfo* info);
-
- // Generate the return sequence code. Should be called no more than
- // once per compiled function, immediately after binding the return
- // target (which can not be done more than once).
- void GenerateReturnSequence(Result* return_value);
-
- // Generate code for a fast smi loop.
- void GenerateFastSmiLoop(ForStatement* node);
-
- // Returns the arguments allocation mode.
- ArgumentsAllocationMode ArgumentsMode();
-
- // Store the arguments object and allocate it if necessary.
- Result StoreArgumentsObject(bool initial);
-
- // The following are used by class Reference.
- void LoadReference(Reference* ref);
- void UnloadReference(Reference* ref);
-
- Operand SlotOperand(Slot* slot, Register tmp);
-
- Operand ContextSlotOperandCheckExtensions(Slot* slot,
- Result tmp,
- JumpTarget* slow);
-
- // Expressions
- void LoadCondition(Expression* x,
- ControlDestination* destination,
- bool force_control);
- void Load(Expression* expr);
- void LoadGlobal();
- void LoadGlobalReceiver();
-
- // Generate code to push the value of an expression on top of the frame
- // and then spill the frame fully to memory. This function is used
- // temporarily while the code generator is being transformed.
- void LoadAndSpill(Expression* expression);
-
- // Read a value from a slot and leave it on top of the expression stack.
- void LoadFromSlot(Slot* slot, TypeofState typeof_state);
- void LoadFromSlotCheckForArguments(Slot* slot, TypeofState state);
- Result LoadFromGlobalSlotCheckExtensions(Slot* slot,
- TypeofState typeof_state,
- JumpTarget* slow);
-
- // Support for loading from local/global variables and arguments
- // whose location is known unless they are shadowed by
- // eval-introduced bindings. Generates no code for unsupported slot
- // types and therefore expects to fall through to the slow jump target.
- void EmitDynamicLoadFromSlotFastCase(Slot* slot,
- TypeofState typeof_state,
- Result* result,
- JumpTarget* slow,
- JumpTarget* done);
-
- // Store the value on top of the expression stack into a slot, leaving the
- // value in place.
- void StoreToSlot(Slot* slot, InitState init_state);
-
- // Support for compiling assignment expressions.
- void EmitSlotAssignment(Assignment* node);
- void EmitNamedPropertyAssignment(Assignment* node);
- void EmitKeyedPropertyAssignment(Assignment* node);
-
- // Receiver is passed on the frame and not consumed.
- Result EmitNamedLoad(Handle<String> name, bool is_contextual);
-
- // If the store is contextual, value is passed on the frame and consumed.
- // Otherwise, receiver and value are passed on the frame and consumed.
- Result EmitNamedStore(Handle<String> name, bool is_contextual);
-
- // Load a property of an object, returning it in a Result.
- // The object and the property name are passed on the stack, and
- // not changed.
- Result EmitKeyedLoad();
-
- // Receiver, key, and value are passed on the frame and consumed.
- Result EmitKeyedStore(StaticType* key_type);
-
- // Special code for typeof expressions: Unfortunately, we must
- // be careful when loading the expression in 'typeof'
- // expressions. We are not allowed to throw reference errors for
- // non-existing properties of the global object, so we must make it
- // look like an explicit property access, instead of an access
- // through the context chain.
- void LoadTypeofExpression(Expression* x);
-
- // Translate the value on top of the frame into control flow to the
- // control destination.
- void ToBoolean(ControlDestination* destination);
-
- // Generate code that computes a shortcutting logical operation.
- void GenerateLogicalBooleanOperation(BinaryOperation* node);
-
- void GenericBinaryOperation(BinaryOperation* expr,
- OverwriteMode overwrite_mode);
-
- // Generate a stub call from the virtual frame.
- Result GenerateGenericBinaryOpStubCall(GenericBinaryOpStub* stub,
- Result* left,
- Result* right);
-
- // Emits code sequence that jumps to a JumpTarget if the inputs
- // are both smis. Cannot be in MacroAssembler because it takes
- // advantage of TypeInfo to skip unneeded checks.
- void JumpIfBothSmiUsingTypeInfo(Result* left,
- Result* right,
- JumpTarget* both_smi);
-
- // Emits code sequence that jumps to deferred code if the input
- // is not a smi. Cannot be in MacroAssembler because it takes
- // advantage of TypeInfo to skip unneeded checks.
- void JumpIfNotSmiUsingTypeInfo(Register reg,
- TypeInfo type,
- DeferredCode* deferred);
-
- // Emits code sequence that jumps to deferred code if the inputs
- // are not both smis. Cannot be in MacroAssembler because it takes
- // advantage of TypeInfo to skip unneeded checks.
- void JumpIfNotBothSmiUsingTypeInfo(Register left,
- Register right,
- TypeInfo left_info,
- TypeInfo right_info,
- DeferredCode* deferred);
-
- // If possible, combine two constant smi values using op to produce
- // a smi result, and push it on the virtual frame, all at compile time.
- // Returns true if it succeeds. Otherwise it has no effect.
- bool FoldConstantSmis(Token::Value op, int left, int right);
-
- // Emit code to perform a binary operation on a constant
- // smi and a likely smi. Consumes the Result *operand.
- Result ConstantSmiBinaryOperation(BinaryOperation* expr,
- Result* operand,
- Handle<Object> constant_operand,
- bool reversed,
- OverwriteMode overwrite_mode);
-
- // Emit code to perform a binary operation on two likely smis.
- // The code to handle smi arguments is produced inline.
- // Consumes the Results *left and *right.
- Result LikelySmiBinaryOperation(BinaryOperation* expr,
- Result* left,
- Result* right,
- OverwriteMode overwrite_mode);
-
- void Comparison(AstNode* node,
- Condition cc,
- bool strict,
- ControlDestination* destination);
-
- // If at least one of the sides is a constant smi, generate optimized code.
- void ConstantSmiComparison(Condition cc,
- bool strict,
- ControlDestination* destination,
- Result* left_side,
- Result* right_side,
- bool left_side_constant_smi,
- bool right_side_constant_smi,
- bool is_loop_condition);
-
- void GenerateInlineNumberComparison(Result* left_side,
- Result* right_side,
- Condition cc,
- ControlDestination* dest);
-
- // To prevent long attacker-controlled byte sequences, integer constants
- // from the JavaScript source are loaded in two parts if they are larger
- // than 16 bits.
- static const int kMaxSmiInlinedBits = 16;
- bool IsUnsafeSmi(Handle<Object> value);
- // Load an integer constant x into a register target using
- // at most 16 bits of user-controlled data per assembly operation.
- void LoadUnsafeSmi(Register target, Handle<Object> value);
-
- void CallWithArguments(ZoneList<Expression*>* arguments,
- CallFunctionFlags flags,
- int position);
-
- // An optimized implementation of expressions of the form
- // x.apply(y, arguments). We call x the applicand and y the receiver.
- // The optimization avoids allocating an arguments object if possible.
- void CallApplyLazy(Expression* applicand,
- Expression* receiver,
- VariableProxy* arguments,
- int position);
-
- void CheckStack();
-
- bool CheckForInlineRuntimeCall(CallRuntime* node);
-
- void ProcessDeclarations(ZoneList<Declaration*>* declarations);
-
- // Declare global variables and functions in the given array of
- // name/value pairs.
- void DeclareGlobals(Handle<FixedArray> pairs);
-
- // Instantiate the function based on the shared function info.
- void InstantiateFunction(Handle<SharedFunctionInfo> function_info,
- bool pretenure);
-
- // Support for type checks.
- void GenerateIsSmi(ZoneList<Expression*>* args);
- void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
- void GenerateIsArray(ZoneList<Expression*>* args);
- void GenerateIsRegExp(ZoneList<Expression*>* args);
- void GenerateIsObject(ZoneList<Expression*>* args);
- void GenerateIsSpecObject(ZoneList<Expression*>* args);
- void GenerateIsFunction(ZoneList<Expression*>* args);
- void GenerateIsUndetectableObject(ZoneList<Expression*>* args);
- void GenerateIsStringWrapperSafeForDefaultValueOf(
- ZoneList<Expression*>* args);
-
- // Support for construct call checks.
- void GenerateIsConstructCall(ZoneList<Expression*>* args);
-
- // Support for arguments.length and arguments[?].
- void GenerateArgumentsLength(ZoneList<Expression*>* args);
- void GenerateArguments(ZoneList<Expression*>* args);
-
- // Support for accessing the class and value fields of an object.
- void GenerateClassOf(ZoneList<Expression*>* args);
- void GenerateValueOf(ZoneList<Expression*>* args);
- void GenerateSetValueOf(ZoneList<Expression*>* args);
-
- // Fast support for charCodeAt(n).
- void GenerateStringCharCodeAt(ZoneList<Expression*>* args);
-
- // Fast support for string.charAt(n) and string[n].
- void GenerateStringCharFromCode(ZoneList<Expression*>* args);
-
- // Fast support for string.charAt(n) and string[n].
- void GenerateStringCharAt(ZoneList<Expression*>* args);
-
- // Fast support for object equality testing.
- void GenerateObjectEquals(ZoneList<Expression*>* args);
-
- void GenerateLog(ZoneList<Expression*>* args);
-
- void GenerateGetFramePointer(ZoneList<Expression*>* args);
-
- // Fast support for Math.random().
- void GenerateRandomHeapNumber(ZoneList<Expression*>* args);
-
- // Fast support for StringAdd.
- void GenerateStringAdd(ZoneList<Expression*>* args);
-
- // Fast support for SubString.
- void GenerateSubString(ZoneList<Expression*>* args);
-
- // Fast support for StringCompare.
- void GenerateStringCompare(ZoneList<Expression*>* args);
-
- // Support for direct calls from JavaScript to native RegExp code.
- void GenerateRegExpExec(ZoneList<Expression*>* args);
-
- void GenerateRegExpConstructResult(ZoneList<Expression*>* args);
-
- // Support for fast native caches.
- void GenerateGetFromCache(ZoneList<Expression*>* args);
-
- // Fast support for number to string.
- void GenerateNumberToString(ZoneList<Expression*>* args);
-
- // Fast swapping of elements. Takes three expressions, the object and two
- // indices. This should only be used if the indices are known to be
- // non-negative and within bounds of the elements array at the call site.
- void GenerateSwapElements(ZoneList<Expression*>* args);
-
- // Fast call for custom callbacks.
- void GenerateCallFunction(ZoneList<Expression*>* args);
-
- // Fast call to math functions.
- void GenerateMathPow(ZoneList<Expression*>* args);
- void GenerateMathSin(ZoneList<Expression*>* args);
- void GenerateMathCos(ZoneList<Expression*>* args);
- void GenerateMathSqrt(ZoneList<Expression*>* args);
- void GenerateMathLog(ZoneList<Expression*>* args);
-
- // Check whether two RegExps are equivalent.
- void GenerateIsRegExpEquivalent(ZoneList<Expression*>* args);
-
- void GenerateHasCachedArrayIndex(ZoneList<Expression*>* args);
- void GenerateGetCachedArrayIndex(ZoneList<Expression*>* args);
- void GenerateFastAsciiArrayJoin(ZoneList<Expression*>* args);
-
- // Simple condition analysis.
- enum ConditionAnalysis {
- ALWAYS_TRUE,
- ALWAYS_FALSE,
- DONT_KNOW
- };
- ConditionAnalysis AnalyzeCondition(Expression* cond);
-
- // Methods used to indicate which source code is generated for. Source
- // positions are collected by the assembler and emitted with the relocation
- // information.
- void CodeForFunctionPosition(FunctionLiteral* fun);
- void CodeForReturnPosition(FunctionLiteral* fun);
- void CodeForStatementPosition(Statement* node);
- void CodeForDoWhileConditionPosition(DoWhileStatement* stmt);
- void CodeForSourcePosition(int pos);
-
- void SetTypeForStackSlot(Slot* slot, TypeInfo info);
-
-#ifdef DEBUG
- // True if the registers are valid for entry to a block. There should
- // be no frame-external references to (non-reserved) registers.
- bool HasValidEntryRegisters();
-#endif
-
- ZoneList<DeferredCode*> deferred_;
-
- // Assembler
- MacroAssembler* masm_; // to generate code
-
- CompilationInfo* info_;
-
- // Code generation state
- VirtualFrame* frame_;
- RegisterAllocator* allocator_;
- CodeGenState* state_;
- int loop_nesting_;
-
- // Jump targets.
- // The target of the return from the function.
- BreakTarget function_return_;
-
- // True if the function return is shadowed (ie, jumping to the target
- // function_return_ does not jump to the true function return, but rather
- // to some unlinking code).
- bool function_return_is_shadowed_;
-
- // True when we are in code that expects the virtual frame to be fully
- // spilled. Some virtual frame function are disabled in DEBUG builds when
- // called from spilled code, because they do not leave the virtual frame
- // in a spilled state.
- bool in_spilled_code_;
-
- friend class VirtualFrame;
- friend class Isolate;
- friend class JumpTarget;
- friend class Reference;
- friend class Result;
- friend class FastCodeGenerator;
- friend class FullCodeGenerator;
- friend class FullCodeGenSyntaxChecker;
-
- friend class CodeGeneratorPatcher; // Used in test-log-stack-tracer.cc
- friend class InlineRuntimeFunctionsTable;
-
DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
};
#if defined(V8_TARGET_ARCH_X64)
-#include "codegen-inl.h"
+#include "assembler.h"
+#include "codegen.h"
#include "debug.h"
#if defined(V8_TARGET_ARCH_X64)
#include "code-stubs.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "compiler.h"
#include "debug.h"
#include "full-codegen.h"
// Compile all the tests with branches to their bodies.
for (int i = 0; i < clauses->length(); i++) {
CaseClause* clause = clauses->at(i);
- clause->body_target()->entry_label()->Unuse();
+ clause->body_target()->Unuse();
// The default is not a test, but remember it as final fall through.
if (clause->is_default()) {
__ cmpq(rdx, rax);
__ j(not_equal, &next_test);
__ Drop(1); // Switch value is no longer needed.
- __ jmp(clause->body_target()->entry_label());
+ __ jmp(clause->body_target());
__ bind(&slow_case);
}
__ testq(rax, rax);
__ j(not_equal, &next_test);
__ Drop(1); // Switch value is no longer needed.
- __ jmp(clause->body_target()->entry_label());
+ __ jmp(clause->body_target());
}
// Discard the test value and jump to the default if present, otherwise to
if (default_clause == NULL) {
__ jmp(nested_statement.break_target());
} else {
- __ jmp(default_clause->body_target()->entry_label());
+ __ jmp(default_clause->body_target());
}
// Compile all the case bodies.
for (int i = 0; i < clauses->length(); i++) {
Comment cmnt(masm_, "[ Case body");
CaseClause* clause = clauses->at(i);
- __ bind(clause->body_target()->entry_label());
+ __ bind(clause->body_target());
PrepareForBailoutForId(clause->EntryId(), NO_REGISTERS);
VisitStatements(clause->statements());
}
#if defined(V8_TARGET_ARCH_X64)
-#include "codegen-inl.h"
+#include "codegen.h"
#include "ic-inl.h"
#include "runtime.h"
#include "stub-cache.h"
+++ /dev/null
-// Copyright 2010 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_X64)
-
-#include "codegen-inl.h"
-#include "jump-target-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// JumpTarget implementation.
-
-#define __ ACCESS_MASM(cgen()->masm())
-
-void JumpTarget::DoJump() {
- ASSERT(cgen()->has_valid_frame());
- // Live non-frame registers are not allowed at unconditional jumps
- // because we have no way of invalidating the corresponding results
- // which are still live in the C++ code.
- ASSERT(cgen()->HasValidEntryRegisters());
-
- if (is_bound()) {
- // Backward jump. There is an expected frame to merge to.
- ASSERT(direction_ == BIDIRECTIONAL);
- cgen()->frame()->PrepareMergeTo(entry_frame_);
- cgen()->frame()->MergeTo(entry_frame_);
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- } else if (entry_frame_ != NULL) {
- // Forward jump with a preconfigured entry frame. Assert the
- // current frame matches the expected one and jump to the block.
- ASSERT(cgen()->frame()->Equals(entry_frame_));
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- } else {
- // Forward jump. Remember the current frame and emit a jump to
- // its merge code.
- AddReachingFrame(cgen()->frame());
- RegisterFile empty;
- cgen()->SetFrame(NULL, &empty);
- __ jmp(&merge_labels_.last());
- }
-}
-
-
-void JumpTarget::DoBranch(Condition cc, Hint b) {
- ASSERT(cgen() != NULL);
- ASSERT(cgen()->has_valid_frame());
-
- if (is_bound()) {
- ASSERT(direction_ == BIDIRECTIONAL);
- // Backward branch. We have an expected frame to merge to on the
- // backward edge.
-
- // Swap the current frame for a copy (we do the swapping to get
- // the off-frame registers off the fall through) to use for the
- // branch.
- VirtualFrame* fall_through_frame = cgen()->frame();
- VirtualFrame* branch_frame = new VirtualFrame(fall_through_frame);
- RegisterFile non_frame_registers;
- cgen()->SetFrame(branch_frame, &non_frame_registers);
-
- // Check if we can avoid merge code.
- cgen()->frame()->PrepareMergeTo(entry_frame_);
- if (cgen()->frame()->Equals(entry_frame_)) {
- // Branch right in to the block.
- cgen()->DeleteFrame();
- __ j(cc, &entry_label_);
- cgen()->SetFrame(fall_through_frame, &non_frame_registers);
- return;
- }
-
- // Check if we can reuse existing merge code.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- if (reaching_frames_[i] != NULL &&
- cgen()->frame()->Equals(reaching_frames_[i])) {
- // Branch to the merge code.
- cgen()->DeleteFrame();
- __ j(cc, &merge_labels_[i]);
- cgen()->SetFrame(fall_through_frame, &non_frame_registers);
- return;
- }
- }
-
- // To emit the merge code here, we negate the condition and branch
- // around the merge code on the fall through path.
- Label original_fall_through;
- __ j(NegateCondition(cc), &original_fall_through);
- cgen()->frame()->MergeTo(entry_frame_);
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- cgen()->SetFrame(fall_through_frame, &non_frame_registers);
- __ bind(&original_fall_through);
-
- } else if (entry_frame_ != NULL) {
- // Forward branch with a preconfigured entry frame. Assert the
- // current frame matches the expected one and branch to the block.
- ASSERT(cgen()->frame()->Equals(entry_frame_));
- // Explicitly use the macro assembler instead of __ as forward
- // branches are expected to be a fixed size (no inserted
- // coverage-checking instructions please). This is used in
- // Reference::GetValue.
- cgen()->masm()->j(cc, &entry_label_);
-
- } else {
- // Forward branch. A copy of the current frame is remembered and
- // a branch to the merge code is emitted. Explicitly use the
- // macro assembler instead of __ as forward branches are expected
- // to be a fixed size (no inserted coverage-checking instructions
- // please). This is used in Reference::GetValue.
- AddReachingFrame(new VirtualFrame(cgen()->frame()));
- cgen()->masm()->j(cc, &merge_labels_.last());
- }
-}
-
-
-void JumpTarget::Call() {
- // Call is used to push the address of the catch block on the stack as
- // a return address when compiling try/catch and try/finally. We
- // fully spill the frame before making the call. The expected frame
- // at the label (which should be the only one) is the spilled current
- // frame plus an in-memory return address. The "fall-through" frame
- // at the return site is the spilled current frame.
- ASSERT(cgen() != NULL);
- ASSERT(cgen()->has_valid_frame());
- // There are no non-frame references across the call.
- ASSERT(cgen()->HasValidEntryRegisters());
- ASSERT(!is_linked());
-
- cgen()->frame()->SpillAll();
- VirtualFrame* target_frame = new VirtualFrame(cgen()->frame());
- target_frame->Adjust(1);
- // We do not expect a call with a preconfigured entry frame.
- ASSERT(entry_frame_ == NULL);
- AddReachingFrame(target_frame);
- __ call(&merge_labels_.last());
-}
-
-
-void JumpTarget::DoBind() {
- ASSERT(cgen() != NULL);
- ASSERT(!is_bound());
-
- // Live non-frame registers are not allowed at the start of a basic
- // block.
- ASSERT(!cgen()->has_valid_frame() || cgen()->HasValidEntryRegisters());
-
- // Fast case: the jump target was manually configured with an entry
- // frame to use.
- if (entry_frame_ != NULL) {
- // Assert no reaching frames to deal with.
- ASSERT(reaching_frames_.is_empty());
- ASSERT(!cgen()->has_valid_frame());
-
- RegisterFile empty;
- if (direction_ == BIDIRECTIONAL) {
- // Copy the entry frame so the original can be used for a
- // possible backward jump.
- cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
- } else {
- // Take ownership of the entry frame.
- cgen()->SetFrame(entry_frame_, &empty);
- entry_frame_ = NULL;
- }
- __ bind(&entry_label_);
- return;
- }
-
- if (!is_linked()) {
- ASSERT(cgen()->has_valid_frame());
- if (direction_ == FORWARD_ONLY) {
- // Fast case: no forward jumps and no possible backward jumps.
- // The stack pointer can be floating above the top of the
- // virtual frame before the bind. Afterward, it should not.
- VirtualFrame* frame = cgen()->frame();
- int difference = frame->stack_pointer_ - (frame->element_count() - 1);
- if (difference > 0) {
- frame->stack_pointer_ -= difference;
- __ addq(rsp, Immediate(difference * kPointerSize));
- }
- } else {
- ASSERT(direction_ == BIDIRECTIONAL);
- // Fast case: no forward jumps, possible backward ones. Remove
- // constants and copies above the watermark on the fall-through
- // frame and use it as the entry frame.
- cgen()->frame()->MakeMergable();
- entry_frame_ = new VirtualFrame(cgen()->frame());
- }
- __ bind(&entry_label_);
- return;
- }
-
- if (direction_ == FORWARD_ONLY &&
- !cgen()->has_valid_frame() &&
- reaching_frames_.length() == 1) {
- // Fast case: no fall-through, a single forward jump, and no
- // possible backward jumps. Pick up the only reaching frame, take
- // ownership of it, and use it for the block about to be emitted.
- VirtualFrame* frame = reaching_frames_[0];
- RegisterFile empty;
- cgen()->SetFrame(frame, &empty);
- reaching_frames_[0] = NULL;
- __ bind(&merge_labels_[0]);
-
- // The stack pointer can be floating above the top of the
- // virtual frame before the bind. Afterward, it should not.
- int difference = frame->stack_pointer_ - (frame->element_count() - 1);
- if (difference > 0) {
- frame->stack_pointer_ -= difference;
- __ addq(rsp, Immediate(difference * kPointerSize));
- }
-
- __ bind(&entry_label_);
- return;
- }
-
- // If there is a current frame, record it as the fall-through. It
- // is owned by the reaching frames for now.
- bool had_fall_through = false;
- if (cgen()->has_valid_frame()) {
- had_fall_through = true;
- AddReachingFrame(cgen()->frame()); // Return value ignored.
- RegisterFile empty;
- cgen()->SetFrame(NULL, &empty);
- }
-
- // Compute the frame to use for entry to the block.
- ComputeEntryFrame();
-
- // Some moves required to merge to an expected frame require purely
- // frame state changes, and do not require any code generation.
- // Perform those first to increase the possibility of finding equal
- // frames below.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- if (reaching_frames_[i] != NULL) {
- reaching_frames_[i]->PrepareMergeTo(entry_frame_);
- }
- }
-
- if (is_linked()) {
- // There were forward jumps. Handle merging the reaching frames
- // to the entry frame.
-
- // Loop over the (non-null) reaching frames and process any that
- // need merge code. Iterate backwards through the list to handle
- // the fall-through frame first. Set frames that will be
- // processed after 'i' to NULL if we want to avoid processing
- // them.
- for (int i = reaching_frames_.length() - 1; i >= 0; i--) {
- VirtualFrame* frame = reaching_frames_[i];
-
- if (frame != NULL) {
- // Does the frame (probably) need merge code?
- if (!frame->Equals(entry_frame_)) {
- // We could have a valid frame as the fall through to the
- // binding site or as the fall through from a previous merge
- // code block. Jump around the code we are about to
- // generate.
- if (cgen()->has_valid_frame()) {
- cgen()->DeleteFrame();
- __ jmp(&entry_label_);
- }
- // Pick up the frame for this block. Assume ownership if
- // there cannot be backward jumps.
- RegisterFile empty;
- if (direction_ == BIDIRECTIONAL) {
- cgen()->SetFrame(new VirtualFrame(frame), &empty);
- } else {
- cgen()->SetFrame(frame, &empty);
- reaching_frames_[i] = NULL;
- }
- __ bind(&merge_labels_[i]);
-
- // Loop over the remaining (non-null) reaching frames,
- // looking for any that can share merge code with this one.
- for (int j = 0; j < i; j++) {
- VirtualFrame* other = reaching_frames_[j];
- if (other != NULL && other->Equals(cgen()->frame())) {
- // Set the reaching frame element to null to avoid
- // processing it later, and then bind its entry label.
- reaching_frames_[j] = NULL;
- __ bind(&merge_labels_[j]);
- }
- }
-
- // Emit the merge code.
- cgen()->frame()->MergeTo(entry_frame_);
- } else if (i == reaching_frames_.length() - 1 && had_fall_through) {
- // If this is the fall through frame, and it didn't need
- // merge code, we need to pick up the frame so we can jump
- // around subsequent merge blocks if necessary.
- RegisterFile empty;
- cgen()->SetFrame(frame, &empty);
- reaching_frames_[i] = NULL;
- }
- }
- }
-
- // The code generator may not have a current frame if there was no
- // fall through and none of the reaching frames needed merging.
- // In that case, clone the entry frame as the current frame.
- if (!cgen()->has_valid_frame()) {
- RegisterFile empty;
- cgen()->SetFrame(new VirtualFrame(entry_frame_), &empty);
- }
-
- // There may be unprocessed reaching frames that did not need
- // merge code. They will have unbound merge labels. Bind their
- // merge labels to be the same as the entry label and deallocate
- // them.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- if (!merge_labels_[i].is_bound()) {
- reaching_frames_[i] = NULL;
- __ bind(&merge_labels_[i]);
- }
- }
-
- // There are non-NULL reaching frames with bound labels for each
- // merge block, but only on backward targets.
- } else {
- // There were no forward jumps. There must be a current frame and
- // this must be a bidirectional target.
- ASSERT(reaching_frames_.length() == 1);
- ASSERT(reaching_frames_[0] != NULL);
- ASSERT(direction_ == BIDIRECTIONAL);
-
- // Use a copy of the reaching frame so the original can be saved
- // for possible reuse as a backward merge block.
- RegisterFile empty;
- cgen()->SetFrame(new VirtualFrame(reaching_frames_[0]), &empty);
- __ bind(&merge_labels_[0]);
- cgen()->frame()->MergeTo(entry_frame_);
- }
-
- __ bind(&entry_label_);
-}
-
-
-void BreakTarget::Jump() {
- // Drop leftover statement state from the frame before merging, without
- // emitting code.
- ASSERT(cgen()->has_valid_frame());
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- DoJump();
-}
-
-
-void BreakTarget::Jump(Result* arg) {
- // Drop leftover statement state from the frame before merging, without
- // emitting code.
- ASSERT(cgen()->has_valid_frame());
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- cgen()->frame()->Push(arg);
- DoJump();
-}
-
-
-void BreakTarget::Bind() {
-#ifdef DEBUG
- // All the forward-reaching frames should have been adjusted at the
- // jumps to this target.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- ASSERT(reaching_frames_[i] == NULL ||
- reaching_frames_[i]->height() == expected_height_);
- }
-#endif
- // Drop leftover statement state from the frame before merging, even on
- // the fall through. This is so we can bind the return target with state
- // on the frame.
- if (cgen()->has_valid_frame()) {
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- }
- DoBind();
-}
-
-
-void BreakTarget::Bind(Result* arg) {
-#ifdef DEBUG
- // All the forward-reaching frames should have been adjusted at the
- // jumps to this target.
- for (int i = 0; i < reaching_frames_.length(); i++) {
- ASSERT(reaching_frames_[i] == NULL ||
- reaching_frames_[i]->height() == expected_height_ + 1);
- }
-#endif
- // Drop leftover statement state from the frame before merging, even on
- // the fall through. This is so we can bind the return target with state
- // on the frame.
- if (cgen()->has_valid_frame()) {
- int count = cgen()->frame()->height() - expected_height_;
- cgen()->frame()->ForgetElements(count);
- cgen()->frame()->Push(arg);
- }
- DoBind();
- *arg = cgen()->frame()->Pop();
-}
-
-
-#undef __
-
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_X64
#if defined(V8_TARGET_ARCH_X64)
#include "bootstrapper.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "assembler-x64.h"
#include "macro-assembler-x64.h"
#include "serialize.h"
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
-#define V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
-
-#include "v8.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-bool RegisterAllocator::IsReserved(Register reg) {
- return reg.is(rsp) || reg.is(rbp) || reg.is(rsi) ||
- reg.is(kScratchRegister) || reg.is(kRootRegister) ||
- reg.is(kSmiConstantRegister);
-}
-
-
-// The register allocator uses small integers to represent the
-// non-reserved assembler registers.
-int RegisterAllocator::ToNumber(Register reg) {
- ASSERT(reg.is_valid() && !IsReserved(reg));
- const int kNumbers[] = {
- 0, // rax
- 2, // rcx
- 3, // rdx
- 1, // rbx
- -1, // rsp Stack pointer.
- -1, // rbp Frame pointer.
- -1, // rsi Context.
- 4, // rdi
- 5, // r8
- 6, // r9
- -1, // r10 Scratch register.
- 8, // r11
- -1, // r12 Smi constant.
- -1, // r13 Roots array. This is callee saved.
- 7, // r14
- 9 // r15
- };
- return kNumbers[reg.code()];
-}
-
-
-Register RegisterAllocator::ToRegister(int num) {
- ASSERT(num >= 0 && num < kNumRegisters);
- const Register kRegisters[] =
- { rax, rbx, rcx, rdx, rdi, r8, r9, r14, r11, r15 };
- return kRegisters[num];
-}
-
-
-void RegisterAllocator::Initialize() {
- Reset();
- // The non-reserved rdi register is live on JS function entry.
- Use(rdi); // JS function.
-}
-} } // namespace v8::internal
-
-#endif // V8_X64_REGISTER_ALLOCATOR_X64_INL_H_
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_X64)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Result implementation.
-
-void Result::ToRegister() {
- ASSERT(is_valid());
- if (is_constant()) {
- CodeGenerator* code_generator =
- CodeGeneratorScope::Current(Isolate::Current());
- Result fresh = code_generator->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- code_generator->masm()->Move(fresh.reg(), handle());
- // This result becomes a copy of the fresh one.
- fresh.set_type_info(type_info());
- *this = fresh;
- }
- ASSERT(is_register());
-}
-
-
-void Result::ToRegister(Register target) {
- ASSERT(is_valid());
- CodeGenerator* code_generator =
- CodeGeneratorScope::Current(Isolate::Current());
- if (!is_register() || !reg().is(target)) {
- Result fresh = code_generator->allocator()->Allocate(target);
- ASSERT(fresh.is_valid());
- if (is_register()) {
- code_generator->masm()->movq(fresh.reg(), reg());
- } else {
- ASSERT(is_constant());
- code_generator->masm()->Move(fresh.reg(), handle());
- }
- fresh.set_type_info(type_info());
- *this = fresh;
- } else if (is_register() && reg().is(target)) {
- ASSERT(code_generator->has_valid_frame());
- code_generator->frame()->Spill(target);
- ASSERT(code_generator->allocator()->count(target) == 1);
- }
- ASSERT(is_register());
- ASSERT(reg().is(target));
-}
-
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
- // This function is not used in 64-bit code.
- UNREACHABLE();
- return Result();
-}
-
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_X64
+++ /dev/null
-// Copyright 2009 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_X64_REGISTER_ALLOCATOR_X64_H_
-#define V8_X64_REGISTER_ALLOCATOR_X64_H_
-
-namespace v8 {
-namespace internal {
-
-class RegisterAllocatorConstants : public AllStatic {
- public:
- static const int kNumRegisters = 10;
- static const int kInvalidRegister = -1;
-};
-
-
-} } // namespace v8::internal
-
-#endif // V8_X64_REGISTER_ALLOCATOR_X64_H_
#if defined(V8_TARGET_ARCH_X64)
#include "ic-inl.h"
-#include "codegen-inl.h"
+#include "codegen.h"
#include "stub-cache.h"
namespace v8 {
+++ /dev/null
-// Copyright 2011 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_X64)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "scopes.h"
-#include "stub-cache.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-#define __ ACCESS_MASM(masm())
-
-void VirtualFrame::Enter() {
- // Registers live on entry to a JS frame:
- // rsp: stack pointer, points to return address from this function.
- // rbp: base pointer, points to previous JS, ArgumentsAdaptor, or
- // Trampoline frame.
- // rsi: context of this function call.
- // rdi: pointer to this function object.
- Comment cmnt(masm(), "[ Enter JS frame");
-
-#ifdef DEBUG
- if (FLAG_debug_code) {
- // Verify that rdi contains a JS function. The following code
- // relies on rax being available for use.
- Condition not_smi = NegateCondition(masm()->CheckSmi(rdi));
- __ Check(not_smi,
- "VirtualFrame::Enter - rdi is not a function (smi check).");
- __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rax);
- __ Check(equal,
- "VirtualFrame::Enter - rdi is not a function (map check).");
- }
-#endif
-
- EmitPush(rbp);
-
- __ movq(rbp, rsp);
-
- // Store the context in the frame. The context is kept in rsi and a
- // copy is stored in the frame. The external reference to rsi
- // remains.
- EmitPush(rsi);
-
- // Store the function in the frame. The frame owns the register
- // reference now (ie, it can keep it in rdi or spill it later).
- Push(rdi);
- SyncElementAt(element_count() - 1);
- cgen()->allocator()->Unuse(rdi);
-}
-
-
-void VirtualFrame::Exit() {
- Comment cmnt(masm(), "[ Exit JS frame");
- // Record the location of the JS exit code for patching when setting
- // break point.
- __ RecordJSReturn();
-
- // Avoid using the leave instruction here, because it is too
- // short. We need the return sequence to be a least the size of a
- // call instruction to support patching the exit code in the
- // debugger. See GenerateReturnSequence for the full return sequence.
- // TODO(X64): A patched call will be very long now. Make sure we
- // have enough room.
- __ movq(rsp, rbp);
- stack_pointer_ = frame_pointer();
- for (int i = element_count() - 1; i > stack_pointer_; i--) {
- FrameElement last = elements_.RemoveLast();
- if (last.is_register()) {
- Unuse(last.reg());
- }
- }
-
- EmitPop(rbp);
-}
-
-
-void VirtualFrame::AllocateStackSlots() {
- int count = local_count();
- if (count > 0) {
- Comment cmnt(masm(), "[ Allocate space for locals");
- // The locals are initialized to a constant (the undefined value), but
- // we sync them with the actual frame to allocate space for spilling
- // them later. First sync everything above the stack pointer so we can
- // use pushes to allocate and initialize the locals.
- SyncRange(stack_pointer_ + 1, element_count() - 1);
- Handle<Object> undefined = FACTORY->undefined_value();
- FrameElement initial_value =
- FrameElement::ConstantElement(undefined, FrameElement::SYNCED);
- if (count < kLocalVarBound) {
- // For fewer locals the unrolled loop is more compact.
-
- // Hope for one of the first eight registers, where the push operation
- // takes only one byte (kScratchRegister needs the REX.W bit).
- Result tmp = cgen()->allocator()->Allocate();
- ASSERT(tmp.is_valid());
- __ movq(tmp.reg(), undefined, RelocInfo::EMBEDDED_OBJECT);
- for (int i = 0; i < count; i++) {
- __ push(tmp.reg());
- }
- } else {
- // For more locals a loop in generated code is more compact.
- Label alloc_locals_loop;
- Result cnt = cgen()->allocator()->Allocate();
- ASSERT(cnt.is_valid());
- __ movq(kScratchRegister, undefined, RelocInfo::EMBEDDED_OBJECT);
-#ifdef DEBUG
- Label loop_size;
- __ bind(&loop_size);
-#endif
- if (is_uint8(count)) {
- // Loading imm8 is shorter than loading imm32.
- // Loading only partial byte register, and using decb below.
- __ movb(cnt.reg(), Immediate(count));
- } else {
- __ movl(cnt.reg(), Immediate(count));
- }
- __ bind(&alloc_locals_loop);
- __ push(kScratchRegister);
- if (is_uint8(count)) {
- __ decb(cnt.reg());
- } else {
- __ decl(cnt.reg());
- }
- __ j(not_zero, &alloc_locals_loop);
-#ifdef DEBUG
- CHECK(masm()->SizeOfCodeGeneratedSince(&loop_size) < kLocalVarBound);
-#endif
- }
- for (int i = 0; i < count; i++) {
- elements_.Add(initial_value);
- stack_pointer_++;
- }
- }
-}
-
-
-void VirtualFrame::SaveContextRegister() {
- ASSERT(elements_[context_index()].is_memory());
- __ movq(Operand(rbp, fp_relative(context_index())), rsi);
-}
-
-
-void VirtualFrame::RestoreContextRegister() {
- ASSERT(elements_[context_index()].is_memory());
- __ movq(rsi, Operand(rbp, fp_relative(context_index())));
-}
-
-
-void VirtualFrame::PushReceiverSlotAddress() {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ lea(temp.reg(), ParameterAt(-1));
- Push(&temp);
-}
-
-
-void VirtualFrame::EmitPop(Register reg) {
- ASSERT(stack_pointer_ == element_count() - 1);
- stack_pointer_--;
- elements_.RemoveLast();
- __ pop(reg);
-}
-
-
-void VirtualFrame::EmitPop(const Operand& operand) {
- ASSERT(stack_pointer_ == element_count() - 1);
- stack_pointer_--;
- elements_.RemoveLast();
- __ pop(operand);
-}
-
-
-void VirtualFrame::EmitPush(Register reg, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ push(reg);
-}
-
-
-void VirtualFrame::EmitPush(const Operand& operand, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ push(operand);
-}
-
-
-void VirtualFrame::EmitPush(Immediate immediate, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ push(immediate);
-}
-
-
-void VirtualFrame::EmitPush(Smi* smi_value) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(TypeInfo::Smi()));
- stack_pointer_++;
- __ Push(smi_value);
-}
-
-
-void VirtualFrame::EmitPush(Handle<Object> value) {
- ASSERT(stack_pointer_ == element_count() - 1);
- TypeInfo info = TypeInfo::TypeFromValue(value);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ Push(value);
-}
-
-
-void VirtualFrame::EmitPush(Heap::RootListIndex index, TypeInfo info) {
- ASSERT(stack_pointer_ == element_count() - 1);
- elements_.Add(FrameElement::MemoryElement(info));
- stack_pointer_++;
- __ PushRoot(index);
-}
-
-
-void VirtualFrame::Push(Expression* expr) {
- ASSERT(expr->IsTrivial());
-
- Literal* lit = expr->AsLiteral();
- if (lit != NULL) {
- Push(lit->handle());
- return;
- }
-
- VariableProxy* proxy = expr->AsVariableProxy();
- if (proxy != NULL) {
- Slot* slot = proxy->var()->AsSlot();
- if (slot->type() == Slot::LOCAL) {
- PushLocalAt(slot->index());
- return;
- }
- if (slot->type() == Slot::PARAMETER) {
- PushParameterAt(slot->index());
- return;
- }
- }
- UNREACHABLE();
-}
-
-
-void VirtualFrame::Push(Handle<Object> value) {
- if (ConstantPoolOverflowed()) {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- if (value->IsSmi()) {
- __ Move(temp.reg(), Smi::cast(*value));
- } else {
- __ movq(temp.reg(), value, RelocInfo::EMBEDDED_OBJECT);
- }
- Push(&temp);
- } else {
- FrameElement element =
- FrameElement::ConstantElement(value, FrameElement::NOT_SYNCED);
- elements_.Add(element);
- }
-}
-
-
-void VirtualFrame::Drop(int count) {
- ASSERT(count >= 0);
- ASSERT(height() >= count);
- int num_virtual_elements = (element_count() - 1) - stack_pointer_;
-
- // Emit code to lower the stack pointer if necessary.
- if (num_virtual_elements < count) {
- int num_dropped = count - num_virtual_elements;
- stack_pointer_ -= num_dropped;
- __ addq(rsp, Immediate(num_dropped * kPointerSize));
- }
-
- // Discard elements from the virtual frame and free any registers.
- for (int i = 0; i < count; i++) {
- FrameElement dropped = elements_.RemoveLast();
- if (dropped.is_register()) {
- Unuse(dropped.reg());
- }
- }
-}
-
-
-int VirtualFrame::InvalidateFrameSlotAt(int index) {
- FrameElement original = elements_[index];
-
- // Is this element the backing store of any copies?
- int new_backing_index = kIllegalIndex;
- if (original.is_copied()) {
- // Verify it is copied, and find first copy.
- for (int i = index + 1; i < element_count(); i++) {
- if (elements_[i].is_copy() && elements_[i].index() == index) {
- new_backing_index = i;
- break;
- }
- }
- }
-
- if (new_backing_index == kIllegalIndex) {
- // No copies found, return kIllegalIndex.
- if (original.is_register()) {
- Unuse(original.reg());
- }
- elements_[index] = FrameElement::InvalidElement();
- return kIllegalIndex;
- }
-
- // This is the backing store of copies.
- Register backing_reg;
- if (original.is_memory()) {
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- Use(fresh.reg(), new_backing_index);
- backing_reg = fresh.reg();
- __ movq(backing_reg, Operand(rbp, fp_relative(index)));
- } else {
- // The original was in a register.
- backing_reg = original.reg();
- set_register_location(backing_reg, new_backing_index);
- }
- // Invalidate the element at index.
- elements_[index] = FrameElement::InvalidElement();
- // Set the new backing element.
- if (elements_[new_backing_index].is_synced()) {
- elements_[new_backing_index] =
- FrameElement::RegisterElement(backing_reg,
- FrameElement::SYNCED,
- original.type_info());
- } else {
- elements_[new_backing_index] =
- FrameElement::RegisterElement(backing_reg,
- FrameElement::NOT_SYNCED,
- original.type_info());
- }
- // Update the other copies.
- for (int i = new_backing_index + 1; i < element_count(); i++) {
- if (elements_[i].is_copy() && elements_[i].index() == index) {
- elements_[i].set_index(new_backing_index);
- elements_[new_backing_index].set_copied();
- }
- }
- return new_backing_index;
-}
-
-
-void VirtualFrame::TakeFrameSlotAt(int index) {
- ASSERT(index >= 0);
- ASSERT(index <= element_count());
- FrameElement original = elements_[index];
- int new_backing_store_index = InvalidateFrameSlotAt(index);
- if (new_backing_store_index != kIllegalIndex) {
- elements_.Add(CopyElementAt(new_backing_store_index));
- return;
- }
-
- switch (original.type()) {
- case FrameElement::MEMORY: {
- // Emit code to load the original element's data into a register.
- // Push that register as a FrameElement on top of the frame.
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid());
- FrameElement new_element =
- FrameElement::RegisterElement(fresh.reg(),
- FrameElement::NOT_SYNCED,
- original.type_info());
- Use(fresh.reg(), element_count());
- elements_.Add(new_element);
- __ movq(fresh.reg(), Operand(rbp, fp_relative(index)));
- break;
- }
- case FrameElement::REGISTER:
- Use(original.reg(), element_count());
- // Fall through.
- case FrameElement::CONSTANT:
- case FrameElement::COPY:
- original.clear_sync();
- elements_.Add(original);
- break;
- case FrameElement::INVALID:
- UNREACHABLE();
- break;
- }
-}
-
-
-void VirtualFrame::StoreToFrameSlotAt(int index) {
- // Store the value on top of the frame to the virtual frame slot at
- // a given index. The value on top of the frame is left in place.
- // This is a duplicating operation, so it can create copies.
- ASSERT(index >= 0);
- ASSERT(index < element_count());
-
- int top_index = element_count() - 1;
- FrameElement top = elements_[top_index];
- FrameElement original = elements_[index];
- if (top.is_copy() && top.index() == index) return;
- ASSERT(top.is_valid());
-
- InvalidateFrameSlotAt(index);
-
- // InvalidateFrameSlotAt can potentially change any frame element, due
- // to spilling registers to allocate temporaries in order to preserve
- // the copy-on-write semantics of aliased elements. Reload top from
- // the frame.
- top = elements_[top_index];
-
- if (top.is_copy()) {
- // There are two cases based on the relative positions of the
- // stored-to slot and the backing slot of the top element.
- int backing_index = top.index();
- ASSERT(backing_index != index);
- if (backing_index < index) {
- // 1. The top element is a copy of a slot below the stored-to
- // slot. The stored-to slot becomes an unsynced copy of that
- // same backing slot.
- elements_[index] = CopyElementAt(backing_index);
- } else {
- // 2. The top element is a copy of a slot above the stored-to
- // slot. The stored-to slot becomes the new (unsynced) backing
- // slot and both the top element and the element at the former
- // backing slot become copies of it. The sync state of the top
- // and former backing elements is preserved.
- FrameElement backing_element = elements_[backing_index];
- ASSERT(backing_element.is_memory() || backing_element.is_register());
- if (backing_element.is_memory()) {
- // Because sets of copies are canonicalized to be backed by
- // their lowest frame element, and because memory frame
- // elements are backed by the corresponding stack address, we
- // have to move the actual value down in the stack.
- //
- // TODO(209): considering allocating the stored-to slot to the
- // temp register. Alternatively, allow copies to appear in
- // any order in the frame and lazily move the value down to
- // the slot.
- __ movq(kScratchRegister, Operand(rbp, fp_relative(backing_index)));
- __ movq(Operand(rbp, fp_relative(index)), kScratchRegister);
- } else {
- set_register_location(backing_element.reg(), index);
- if (backing_element.is_synced()) {
- // If the element is a register, we will not actually move
- // anything on the stack but only update the virtual frame
- // element.
- backing_element.clear_sync();
- }
- }
- elements_[index] = backing_element;
-
- // The old backing element becomes a copy of the new backing
- // element.
- FrameElement new_element = CopyElementAt(index);
- elements_[backing_index] = new_element;
- if (backing_element.is_synced()) {
- elements_[backing_index].set_sync();
- }
-
- // All the copies of the old backing element (including the top
- // element) become copies of the new backing element.
- for (int i = backing_index + 1; i < element_count(); i++) {
- if (elements_[i].is_copy() && elements_[i].index() == backing_index) {
- elements_[i].set_index(index);
- }
- }
- }
- return;
- }
-
- // Move the top element to the stored-to slot and replace it (the
- // top element) with a copy.
- elements_[index] = top;
- if (top.is_memory()) {
- // TODO(209): consider allocating the stored-to slot to the temp
- // register. Alternatively, allow copies to appear in any order
- // in the frame and lazily move the value down to the slot.
- FrameElement new_top = CopyElementAt(index);
- new_top.set_sync();
- elements_[top_index] = new_top;
-
- // The sync state of the former top element is correct (synced).
- // Emit code to move the value down in the frame.
- __ movq(kScratchRegister, Operand(rsp, 0));
- __ movq(Operand(rbp, fp_relative(index)), kScratchRegister);
- } else if (top.is_register()) {
- set_register_location(top.reg(), index);
- // The stored-to slot has the (unsynced) register reference and
- // the top element becomes a copy. The sync state of the top is
- // preserved.
- FrameElement new_top = CopyElementAt(index);
- if (top.is_synced()) {
- new_top.set_sync();
- elements_[index].clear_sync();
- }
- elements_[top_index] = new_top;
- } else {
- // The stored-to slot holds the same value as the top but
- // unsynced. (We do not have copies of constants yet.)
- ASSERT(top.is_constant());
- elements_[index].clear_sync();
- }
-}
-
-
-void VirtualFrame::MakeMergable() {
- for (int i = 0; i < element_count(); i++) {
- FrameElement element = elements_[i];
-
- // In all cases we have to reset the number type information
- // to unknown for a mergable frame because of incoming back edges.
- if (element.is_constant() || element.is_copy()) {
- if (element.is_synced()) {
- // Just spill.
- elements_[i] = FrameElement::MemoryElement(TypeInfo::Unknown());
- } else {
- // Allocate to a register.
- FrameElement backing_element; // Invalid if not a copy.
- if (element.is_copy()) {
- backing_element = elements_[element.index()];
- }
- Result fresh = cgen()->allocator()->Allocate();
- ASSERT(fresh.is_valid()); // A register was spilled if all were in use.
- elements_[i] =
- FrameElement::RegisterElement(fresh.reg(),
- FrameElement::NOT_SYNCED,
- TypeInfo::Unknown());
- Use(fresh.reg(), i);
-
- // Emit a move.
- if (element.is_constant()) {
- __ Move(fresh.reg(), element.handle());
- } else {
- ASSERT(element.is_copy());
- // Copies are only backed by register or memory locations.
- if (backing_element.is_register()) {
- // The backing store may have been spilled by allocating,
- // but that's OK. If it was, the value is right where we
- // want it.
- if (!fresh.reg().is(backing_element.reg())) {
- __ movq(fresh.reg(), backing_element.reg());
- }
- } else {
- ASSERT(backing_element.is_memory());
- __ movq(fresh.reg(), Operand(rbp, fp_relative(element.index())));
- }
- }
- }
- // No need to set the copied flag --- there are no copies.
- } else {
- // Clear the copy flag of non-constant, non-copy elements.
- // They cannot be copied because copies are not allowed.
- // The copy flag is not relied on before the end of this loop,
- // including when registers are spilled.
- elements_[i].clear_copied();
- elements_[i].set_type_info(TypeInfo::Unknown());
- }
- }
-}
-
-
-void VirtualFrame::MergeTo(VirtualFrame* expected) {
- Comment cmnt(masm(), "[ Merge frame");
- // We should always be merging the code generator's current frame to an
- // expected frame.
- ASSERT(cgen()->frame() == this);
-
- // Adjust the stack pointer upward (toward the top of the virtual
- // frame) if necessary.
- if (stack_pointer_ < expected->stack_pointer_) {
- int difference = expected->stack_pointer_ - stack_pointer_;
- stack_pointer_ = expected->stack_pointer_;
- __ subq(rsp, Immediate(difference * kPointerSize));
- }
-
- MergeMoveRegistersToMemory(expected);
- MergeMoveRegistersToRegisters(expected);
- MergeMoveMemoryToRegisters(expected);
-
- // Adjust the stack pointer downward if necessary.
- if (stack_pointer_ > expected->stack_pointer_) {
- int difference = stack_pointer_ - expected->stack_pointer_;
- stack_pointer_ = expected->stack_pointer_;
- __ addq(rsp, Immediate(difference * kPointerSize));
- }
-
- // At this point, the frames should be identical.
- ASSERT(Equals(expected));
-}
-
-
-void VirtualFrame::MergeMoveRegistersToMemory(VirtualFrame* expected) {
- ASSERT(stack_pointer_ >= expected->stack_pointer_);
-
- // Move registers, constants, and copies to memory. Perform moves
- // from the top downward in the frame in order to leave the backing
- // stores of copies in registers.
- for (int i = element_count() - 1; i >= 0; i--) {
- FrameElement target = expected->elements_[i];
- if (target.is_register()) continue; // Handle registers later.
- if (target.is_memory()) {
- FrameElement source = elements_[i];
- switch (source.type()) {
- case FrameElement::INVALID:
- // Not a legal merge move.
- UNREACHABLE();
- break;
-
- case FrameElement::MEMORY:
- // Already in place.
- break;
-
- case FrameElement::REGISTER:
- Unuse(source.reg());
- if (!source.is_synced()) {
- __ movq(Operand(rbp, fp_relative(i)), source.reg());
- }
- break;
-
- case FrameElement::CONSTANT:
- if (!source.is_synced()) {
- __ Move(Operand(rbp, fp_relative(i)), source.handle());
- }
- break;
-
- case FrameElement::COPY:
- if (!source.is_synced()) {
- int backing_index = source.index();
- FrameElement backing_element = elements_[backing_index];
- if (backing_element.is_memory()) {
- __ movq(kScratchRegister,
- Operand(rbp, fp_relative(backing_index)));
- __ movq(Operand(rbp, fp_relative(i)), kScratchRegister);
- } else {
- ASSERT(backing_element.is_register());
- __ movq(Operand(rbp, fp_relative(i)), backing_element.reg());
- }
- }
- break;
- }
- }
- elements_[i] = target;
- }
-}
-
-
-void VirtualFrame::MergeMoveRegistersToRegisters(VirtualFrame* expected) {
- // We have already done X-to-memory moves.
- ASSERT(stack_pointer_ >= expected->stack_pointer_);
-
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- // Move the right value into register i if it is currently in a register.
- int index = expected->register_location(i);
- int use_index = register_location(i);
- // Skip if register i is unused in the target or else if source is
- // not a register (this is not a register-to-register move).
- if (index == kIllegalIndex || !elements_[index].is_register()) continue;
-
- Register target = RegisterAllocator::ToRegister(i);
- Register source = elements_[index].reg();
- if (index != use_index) {
- if (use_index == kIllegalIndex) { // Target is currently unused.
- // Copy contents of source from source to target.
- // Set frame element register to target.
- Use(target, index);
- Unuse(source);
- __ movq(target, source);
- } else {
- // Exchange contents of registers source and target.
- // Nothing except the register backing use_index has changed.
- elements_[use_index].set_reg(source);
- set_register_location(target, index);
- set_register_location(source, use_index);
- __ xchg(source, target);
- }
- }
-
- if (!elements_[index].is_synced() &&
- expected->elements_[index].is_synced()) {
- __ movq(Operand(rbp, fp_relative(index)), target);
- }
- elements_[index] = expected->elements_[index];
- }
-}
-
-
-void VirtualFrame::MergeMoveMemoryToRegisters(VirtualFrame* expected) {
- // Move memory, constants, and copies to registers. This is the
- // final step and since it is not done from the bottom up, but in
- // register code order, we have special code to ensure that the backing
- // elements of copies are in their correct locations when we
- // encounter the copies.
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- int index = expected->register_location(i);
- if (index != kIllegalIndex) {
- FrameElement source = elements_[index];
- FrameElement target = expected->elements_[index];
- Register target_reg = RegisterAllocator::ToRegister(i);
- ASSERT(target.reg().is(target_reg));
- switch (source.type()) {
- case FrameElement::INVALID: // Fall through.
- UNREACHABLE();
- break;
- case FrameElement::REGISTER:
- ASSERT(source.Equals(target));
- // Go to next iteration. Skips Use(target_reg) and syncing
- // below. It is safe to skip syncing because a target
- // register frame element would only be synced if all source
- // elements were.
- continue;
- break;
- case FrameElement::MEMORY:
- ASSERT(index <= stack_pointer_);
- __ movq(target_reg, Operand(rbp, fp_relative(index)));
- break;
-
- case FrameElement::CONSTANT:
- __ Move(target_reg, source.handle());
- break;
-
- case FrameElement::COPY: {
- int backing_index = source.index();
- FrameElement backing = elements_[backing_index];
- ASSERT(backing.is_memory() || backing.is_register());
- if (backing.is_memory()) {
- ASSERT(backing_index <= stack_pointer_);
- // Code optimization if backing store should also move
- // to a register: move backing store to its register first.
- if (expected->elements_[backing_index].is_register()) {
- FrameElement new_backing = expected->elements_[backing_index];
- Register new_backing_reg = new_backing.reg();
- ASSERT(!is_used(new_backing_reg));
- elements_[backing_index] = new_backing;
- Use(new_backing_reg, backing_index);
- __ movq(new_backing_reg,
- Operand(rbp, fp_relative(backing_index)));
- __ movq(target_reg, new_backing_reg);
- } else {
- __ movq(target_reg, Operand(rbp, fp_relative(backing_index)));
- }
- } else {
- __ movq(target_reg, backing.reg());
- }
- }
- }
- // Ensure the proper sync state.
- if (target.is_synced() && !source.is_synced()) {
- __ movq(Operand(rbp, fp_relative(index)), target_reg);
- }
- Use(target_reg, index);
- elements_[index] = target;
- }
- }
-}
-
-
-Result VirtualFrame::Pop() {
- FrameElement element = elements_.RemoveLast();
- int index = element_count();
- ASSERT(element.is_valid());
-
- // Get number type information of the result.
- TypeInfo info;
- if (!element.is_copy()) {
- info = element.type_info();
- } else {
- info = elements_[element.index()].type_info();
- }
-
- bool pop_needed = (stack_pointer_ == index);
- if (pop_needed) {
- stack_pointer_--;
- if (element.is_memory()) {
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- __ pop(temp.reg());
- temp.set_type_info(info);
- return temp;
- }
-
- __ addq(rsp, Immediate(kPointerSize));
- }
- ASSERT(!element.is_memory());
-
- // The top element is a register, constant, or a copy. Unuse
- // registers and follow copies to their backing store.
- if (element.is_register()) {
- Unuse(element.reg());
- } else if (element.is_copy()) {
- ASSERT(element.index() < index);
- index = element.index();
- element = elements_[index];
- }
- ASSERT(!element.is_copy());
-
- // The element is memory, a register, or a constant.
- if (element.is_memory()) {
- // Memory elements could only be the backing store of a copy.
- // Allocate the original to a register.
- ASSERT(index <= stack_pointer_);
- Result temp = cgen()->allocator()->Allocate();
- ASSERT(temp.is_valid());
- Use(temp.reg(), index);
- FrameElement new_element =
- FrameElement::RegisterElement(temp.reg(),
- FrameElement::SYNCED,
- element.type_info());
- // Preserve the copy flag on the element.
- if (element.is_copied()) new_element.set_copied();
- elements_[index] = new_element;
- __ movq(temp.reg(), Operand(rbp, fp_relative(index)));
- return Result(temp.reg(), info);
- } else if (element.is_register()) {
- return Result(element.reg(), info);
- } else {
- ASSERT(element.is_constant());
- return Result(element.handle());
- }
-}
-
-
-Result VirtualFrame::RawCallStub(CodeStub* stub) {
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallStub(stub);
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::CallStub(CodeStub* stub, Result* arg) {
- PrepareForCall(0, 0);
- arg->ToRegister(rax);
- arg->Unuse();
- return RawCallStub(stub);
-}
-
-
-Result VirtualFrame::CallStub(CodeStub* stub, Result* arg0, Result* arg1) {
- PrepareForCall(0, 0);
-
- if (arg0->is_register() && arg0->reg().is(rax)) {
- if (arg1->is_register() && arg1->reg().is(rdx)) {
- // Wrong registers.
- __ xchg(rax, rdx);
- } else {
- // Register rdx is free for arg0, which frees rax for arg1.
- arg0->ToRegister(rdx);
- arg1->ToRegister(rax);
- }
- } else {
- // Register rax is free for arg1, which guarantees rdx is free for
- // arg0.
- arg1->ToRegister(rax);
- arg0->ToRegister(rdx);
- }
-
- arg0->Unuse();
- arg1->Unuse();
- return RawCallStub(stub);
-}
-
-
-Result VirtualFrame::CallJSFunction(int arg_count) {
- Result function = Pop();
-
- // InvokeFunction requires function in rdi. Move it in there.
- function.ToRegister(rdi);
- function.Unuse();
-
- // +1 for receiver.
- PrepareForCall(arg_count + 1, arg_count + 1);
- ASSERT(cgen()->HasValidEntryRegisters());
- ParameterCount count(arg_count);
- __ InvokeFunction(rdi, count, CALL_FUNCTION);
- RestoreContextRegister();
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-void VirtualFrame::SyncElementBelowStackPointer(int index) {
- // Emit code to write elements below the stack pointer to their
- // (already allocated) stack address.
- ASSERT(index <= stack_pointer_);
- FrameElement element = elements_[index];
- ASSERT(!element.is_synced());
- switch (element.type()) {
- case FrameElement::INVALID:
- break;
-
- case FrameElement::MEMORY:
- // This function should not be called with synced elements.
- // (memory elements are always synced).
- UNREACHABLE();
- break;
-
- case FrameElement::REGISTER:
- __ movq(Operand(rbp, fp_relative(index)), element.reg());
- break;
-
- case FrameElement::CONSTANT:
- __ Move(Operand(rbp, fp_relative(index)), element.handle());
- break;
-
- case FrameElement::COPY: {
- int backing_index = element.index();
- FrameElement backing_element = elements_[backing_index];
- if (backing_element.is_memory()) {
- __ movq(kScratchRegister, Operand(rbp, fp_relative(backing_index)));
- __ movq(Operand(rbp, fp_relative(index)), kScratchRegister);
- } else {
- ASSERT(backing_element.is_register());
- __ movq(Operand(rbp, fp_relative(index)), backing_element.reg());
- }
- break;
- }
- }
- elements_[index].set_sync();
-}
-
-
-void VirtualFrame::SyncElementByPushing(int index) {
- // Sync an element of the frame that is just above the stack pointer
- // by pushing it.
- ASSERT(index == stack_pointer_ + 1);
- stack_pointer_++;
- FrameElement element = elements_[index];
-
- switch (element.type()) {
- case FrameElement::INVALID:
- __ Push(Smi::FromInt(0));
- break;
-
- case FrameElement::MEMORY:
- // No memory elements exist above the stack pointer.
- UNREACHABLE();
- break;
-
- case FrameElement::REGISTER:
- __ push(element.reg());
- break;
-
- case FrameElement::CONSTANT:
- __ Move(kScratchRegister, element.handle());
- __ push(kScratchRegister);
- break;
-
- case FrameElement::COPY: {
- int backing_index = element.index();
- FrameElement backing = elements_[backing_index];
- ASSERT(backing.is_memory() || backing.is_register());
- if (backing.is_memory()) {
- __ push(Operand(rbp, fp_relative(backing_index)));
- } else {
- __ push(backing.reg());
- }
- break;
- }
- }
- elements_[index].set_sync();
-}
-
-
-// Clear the dirty bits for the range of elements in
-// [min(stack_pointer_ + 1,begin), end].
-void VirtualFrame::SyncRange(int begin, int end) {
- ASSERT(begin >= 0);
- ASSERT(end < element_count());
- // Sync elements below the range if they have not been materialized
- // on the stack.
- int start = Min(begin, stack_pointer_ + 1);
- int end_or_stack_pointer = Min(stack_pointer_, end);
- // Emit normal push instructions for elements above stack pointer
- // and use mov instructions if we are below stack pointer.
- int i = start;
-
- while (i <= end_or_stack_pointer) {
- if (!elements_[i].is_synced()) SyncElementBelowStackPointer(i);
- i++;
- }
- while (i <= end) {
- SyncElementByPushing(i);
- i++;
- }
-}
-
-
-//------------------------------------------------------------------------------
-// Virtual frame stub and IC calling functions.
-
-Result VirtualFrame::CallRuntime(const Runtime::Function* f, int arg_count) {
- PrepareForCall(arg_count, arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallRuntime(f, arg_count);
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::CallRuntime(Runtime::FunctionId id, int arg_count) {
- PrepareForCall(arg_count, arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ CallRuntime(id, arg_count);
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
-void VirtualFrame::DebugBreak() {
- PrepareForCall(0, 0);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ DebugBreak();
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
-}
-#endif
-
-
-Result VirtualFrame::InvokeBuiltin(Builtins::JavaScript id,
- InvokeFlag flag,
- int arg_count) {
- PrepareForCall(arg_count, arg_count);
- ASSERT(cgen()->HasValidEntryRegisters());
- __ InvokeBuiltin(id, flag);
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-Result VirtualFrame::RawCallCodeObject(Handle<Code> code,
- RelocInfo::Mode rmode) {
- ASSERT(cgen()->HasValidEntryRegisters());
- __ Call(code, rmode);
- Result result = cgen()->allocator()->Allocate(rax);
- ASSERT(result.is_valid());
- return result;
-}
-
-
-// This function assumes that the only results that could be in a_reg or b_reg
-// are a and b. Other results can be live, but must not be in a_reg or b_reg.
-void VirtualFrame::MoveResultsToRegisters(Result* a,
- Result* b,
- Register a_reg,
- Register b_reg) {
- ASSERT(!a_reg.is(b_reg));
- // Assert that cgen()->allocator()->count(a_reg) is accounted for by a and b.
- ASSERT(cgen()->allocator()->count(a_reg) <= 2);
- ASSERT(cgen()->allocator()->count(a_reg) != 2 || a->reg().is(a_reg));
- ASSERT(cgen()->allocator()->count(a_reg) != 2 || b->reg().is(a_reg));
- ASSERT(cgen()->allocator()->count(a_reg) != 1 ||
- (a->is_register() && a->reg().is(a_reg)) ||
- (b->is_register() && b->reg().is(a_reg)));
- // Assert that cgen()->allocator()->count(b_reg) is accounted for by a and b.
- ASSERT(cgen()->allocator()->count(b_reg) <= 2);
- ASSERT(cgen()->allocator()->count(b_reg) != 2 || a->reg().is(b_reg));
- ASSERT(cgen()->allocator()->count(b_reg) != 2 || b->reg().is(b_reg));
- ASSERT(cgen()->allocator()->count(b_reg) != 1 ||
- (a->is_register() && a->reg().is(b_reg)) ||
- (b->is_register() && b->reg().is(b_reg)));
-
- if (a->is_register() && a->reg().is(a_reg)) {
- b->ToRegister(b_reg);
- } else if (!cgen()->allocator()->is_used(a_reg)) {
- a->ToRegister(a_reg);
- b->ToRegister(b_reg);
- } else if (cgen()->allocator()->is_used(b_reg)) {
- // a must be in b_reg, b in a_reg.
- __ xchg(a_reg, b_reg);
- // Results a and b will be invalidated, so it is ok if they are switched.
- } else {
- b->ToRegister(b_reg);
- a->ToRegister(a_reg);
- }
- a->Unuse();
- b->Unuse();
-}
-
-
-Result VirtualFrame::CallLoadIC(RelocInfo::Mode mode) {
- // Name and receiver are on the top of the frame. Both are dropped.
- // The IC expects name in rcx and receiver in rax.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kLoadIC_Initialize));
- Result name = Pop();
- Result receiver = Pop();
- PrepareForCall(0, 0);
- MoveResultsToRegisters(&name, &receiver, rcx, rax);
-
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallKeyedLoadIC(RelocInfo::Mode mode) {
- // Key and receiver are on top of the frame. Put them in rax and rdx.
- Result key = Pop();
- Result receiver = Pop();
- PrepareForCall(0, 0);
- MoveResultsToRegisters(&key, &receiver, rax, rdx);
-
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kKeyedLoadIC_Initialize));
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallStoreIC(Handle<String> name,
- bool is_contextual,
- StrictModeFlag strict_mode) {
- // Value and (if not contextual) receiver are on top of the frame.
- // The IC expects name in rcx, value in rax, and receiver in rdx.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode == kStrictMode) ? Builtins::kStoreIC_Initialize_Strict
- : Builtins::kStoreIC_Initialize));
- Result value = Pop();
- RelocInfo::Mode mode;
- if (is_contextual) {
- PrepareForCall(0, 0);
- value.ToRegister(rax);
- __ movq(rdx, Operand(rsi, Context::SlotOffset(Context::GLOBAL_INDEX)));
- value.Unuse();
- mode = RelocInfo::CODE_TARGET_CONTEXT;
- } else {
- Result receiver = Pop();
- PrepareForCall(0, 0);
- MoveResultsToRegisters(&value, &receiver, rax, rdx);
- mode = RelocInfo::CODE_TARGET;
- }
- __ Move(rcx, name);
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallKeyedStoreIC(StrictModeFlag strict_mode) {
- // Value, key, and receiver are on the top of the frame. The IC
- // expects value in rax, key in rcx, and receiver in rdx.
- Result value = Pop();
- Result key = Pop();
- Result receiver = Pop();
- PrepareForCall(0, 0);
- if (!cgen()->allocator()->is_used(rax) ||
- (value.is_register() && value.reg().is(rax))) {
- if (!cgen()->allocator()->is_used(rax)) {
- value.ToRegister(rax);
- }
- MoveResultsToRegisters(&key, &receiver, rcx, rdx);
- value.Unuse();
- } else if (!cgen()->allocator()->is_used(rcx) ||
- (key.is_register() && key.reg().is(rcx))) {
- if (!cgen()->allocator()->is_used(rcx)) {
- key.ToRegister(rcx);
- }
- MoveResultsToRegisters(&value, &receiver, rax, rdx);
- key.Unuse();
- } else if (!cgen()->allocator()->is_used(rdx) ||
- (receiver.is_register() && receiver.reg().is(rdx))) {
- if (!cgen()->allocator()->is_used(rdx)) {
- receiver.ToRegister(rdx);
- }
- MoveResultsToRegisters(&key, &value, rcx, rax);
- receiver.Unuse();
- } else {
- // All three registers are used, and no value is in the correct place.
- // We have one of the two circular permutations of rax, rcx, rdx.
- ASSERT(value.is_register());
- if (value.reg().is(rcx)) {
- __ xchg(rax, rdx);
- __ xchg(rax, rcx);
- } else {
- __ xchg(rax, rcx);
- __ xchg(rax, rdx);
- }
- value.Unuse();
- key.Unuse();
- receiver.Unuse();
- }
-
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- (strict_mode == kStrictMode) ? Builtins::kKeyedStoreIC_Initialize_Strict
- : Builtins::kKeyedStoreIC_Initialize));
- return RawCallCodeObject(ic, RelocInfo::CODE_TARGET);
-}
-
-
-Result VirtualFrame::CallCallIC(RelocInfo::Mode mode,
- int arg_count,
- int loop_nesting) {
- // Function name, arguments, and receiver are found on top of the frame
- // and dropped by the call. The IC expects the name in rcx and the rest
- // on the stack, and drops them all.
- InLoopFlag in_loop = loop_nesting > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> ic =
- ISOLATE->stub_cache()->ComputeCallInitialize(arg_count, in_loop);
- Result name = Pop();
- // Spill args, receiver, and function. The call will drop args and
- // receiver.
- PrepareForCall(arg_count + 1, arg_count + 1);
- name.ToRegister(rcx);
- name.Unuse();
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallKeyedCallIC(RelocInfo::Mode mode,
- int arg_count,
- int loop_nesting) {
- // Function name, arguments, and receiver are found on top of the frame
- // and dropped by the call. The IC expects the name in rcx and the rest
- // on the stack, and drops them all.
- InLoopFlag in_loop = loop_nesting > 0 ? IN_LOOP : NOT_IN_LOOP;
- Handle<Code> ic =
- ISOLATE->stub_cache()->ComputeKeyedCallInitialize(arg_count, in_loop);
- Result name = Pop();
- // Spill args, receiver, and function. The call will drop args and
- // receiver.
- PrepareForCall(arg_count + 1, arg_count + 1);
- name.ToRegister(rcx);
- name.Unuse();
- return RawCallCodeObject(ic, mode);
-}
-
-
-Result VirtualFrame::CallConstructor(int arg_count) {
- // Arguments, receiver, and function are on top of the frame. The
- // IC expects arg count in rax, function in rdi, and the arguments
- // and receiver on the stack.
- Handle<Code> ic(Isolate::Current()->builtins()->builtin(
- Builtins::kJSConstructCall));
- // Duplicate the function before preparing the frame.
- PushElementAt(arg_count);
- Result function = Pop();
- PrepareForCall(arg_count + 1, arg_count + 1); // Spill function and args.
- function.ToRegister(rdi);
-
- // Constructors are called with the number of arguments in register
- // rax for now. Another option would be to have separate construct
- // call trampolines per different arguments counts encountered.
- Result num_args = cgen()->allocator()->Allocate(rax);
- ASSERT(num_args.is_valid());
- __ Set(num_args.reg(), arg_count);
-
- function.Unuse();
- num_args.Unuse();
- return RawCallCodeObject(ic, RelocInfo::CONSTRUCT_CALL);
-}
-
-
-void VirtualFrame::PushTryHandler(HandlerType type) {
- ASSERT(cgen()->HasValidEntryRegisters());
- // Grow the expression stack by handler size less one (the return
- // address is already pushed by a call instruction).
- Adjust(kHandlerSize - 1);
- __ PushTryHandler(IN_JAVASCRIPT, type);
-}
-
-
-#undef __
-
-} } // namespace v8::internal
-
-#endif // V8_TARGET_ARCH_X64
+++ /dev/null
-// Copyright 2011 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_X64_VIRTUAL_FRAME_X64_H_
-#define V8_X64_VIRTUAL_FRAME_X64_H_
-
-#include "type-info.h"
-#include "register-allocator.h"
-#include "scopes.h"
-#include "codegen.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Virtual frames
-//
-// The virtual frame is an abstraction of the physical stack frame. It
-// encapsulates the parameters, frame-allocated locals, and the expression
-// stack. It supports push/pop operations on the expression stack, as well
-// as random access to the expression stack elements, locals, and
-// parameters.
-
-class VirtualFrame : public ZoneObject {
- public:
- // A utility class to introduce a scope where the virtual frame is
- // expected to remain spilled. The constructor spills the code
- // generator's current frame, but no attempt is made to require it
- // to stay spilled. It is intended as documentation while the code
- // generator is being transformed.
- class SpilledScope BASE_EMBEDDED {
- public:
- SpilledScope() : previous_state_(cgen()->in_spilled_code()) {
- ASSERT(cgen()->has_valid_frame());
- cgen()->frame()->SpillAll();
- cgen()->set_in_spilled_code(true);
- }
-
- ~SpilledScope() {
- cgen()->set_in_spilled_code(previous_state_);
- }
-
- private:
- bool previous_state_;
-
- CodeGenerator* cgen() {
- return CodeGeneratorScope::Current(Isolate::Current());
- }
- };
-
- // An illegal index into the virtual frame.
- static const int kIllegalIndex = -1;
-
- // Construct an initial virtual frame on entry to a JS function.
- inline VirtualFrame();
-
- // Construct a virtual frame as a clone of an existing one.
- explicit inline VirtualFrame(VirtualFrame* original);
-
- CodeGenerator* cgen() {
- return CodeGeneratorScope::Current(Isolate::Current());
- }
-
- MacroAssembler* masm() { return cgen()->masm(); }
-
- // Create a duplicate of an existing valid frame element.
- FrameElement CopyElementAt(int index,
- TypeInfo info = TypeInfo::Uninitialized());
-
- // The number of elements on the virtual frame.
- int element_count() { return elements_.length(); }
-
- // The height of the virtual expression stack.
- int height() {
- return element_count() - expression_base_index();
- }
-
- int register_location(int num) {
- ASSERT(num >= 0 && num < RegisterAllocator::kNumRegisters);
- return register_locations_[num];
- }
-
- inline int register_location(Register reg);
-
- inline void set_register_location(Register reg, int index);
-
- bool is_used(int num) {
- ASSERT(num >= 0 && num < RegisterAllocator::kNumRegisters);
- return register_locations_[num] != kIllegalIndex;
- }
-
- inline bool is_used(Register reg);
-
- // Add extra in-memory elements to the top of the frame to match an actual
- // frame (eg, the frame after an exception handler is pushed). No code is
- // emitted.
- void Adjust(int count);
-
- // Forget count elements from the top of the frame all in-memory
- // (including synced) and adjust the stack pointer downward, to
- // match an external frame effect (examples include a call removing
- // its arguments, and exiting a try/catch removing an exception
- // handler). No code will be emitted.
- void Forget(int count) {
- ASSERT(count >= 0);
- ASSERT(stack_pointer_ == element_count() - 1);
- stack_pointer_ -= count;
- ForgetElements(count);
- }
-
- // Forget count elements from the top of the frame without adjusting
- // the stack pointer downward. This is used, for example, before
- // merging frames at break, continue, and return targets.
- void ForgetElements(int count);
-
- // Spill all values from the frame to memory.
- inline void SpillAll();
-
- // Spill all occurrences of a specific register from the frame.
- void Spill(Register reg) {
- if (is_used(reg)) SpillElementAt(register_location(reg));
- }
-
- // Spill all occurrences of an arbitrary register if possible. Return the
- // register spilled or no_reg if it was not possible to free any register
- // (ie, they all have frame-external references).
- Register SpillAnyRegister();
-
- // Spill the top element of the frame to memory.
- void SpillTop() { SpillElementAt(element_count() - 1); }
-
- // Sync the range of elements in [begin, end] with memory.
- void SyncRange(int begin, int end);
-
- // Make this frame so that an arbitrary frame of the same height can
- // be merged to it. Copies and constants are removed from the frame.
- void MakeMergable();
-
- // Prepare this virtual frame for merging to an expected frame by
- // performing some state changes that do not require generating
- // code. It is guaranteed that no code will be generated.
- void PrepareMergeTo(VirtualFrame* expected);
-
- // Make this virtual frame have a state identical to an expected virtual
- // frame. As a side effect, code may be emitted to make this frame match
- // the expected one.
- void MergeTo(VirtualFrame* expected);
-
- // Detach a frame from its code generator, perhaps temporarily. This
- // tells the register allocator that it is free to use frame-internal
- // registers. Used when the code generator's frame is switched from this
- // one to NULL by an unconditional jump.
- void DetachFromCodeGenerator() {
- RegisterAllocator* cgen_allocator = cgen()->allocator();
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (is_used(i)) cgen_allocator->Unuse(i);
- }
- }
-
- // (Re)attach a frame to its code generator. This informs the register
- // allocator that the frame-internal register references are active again.
- // Used when a code generator's frame is switched from NULL to this one by
- // binding a label.
- void AttachToCodeGenerator() {
- RegisterAllocator* cgen_allocator = cgen()->allocator();
- for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
- if (is_used(i)) cgen_allocator->Use(i);
- }
- }
-
- // Emit code for the physical JS entry and exit frame sequences. After
- // calling Enter, the virtual frame is ready for use; and after calling
- // Exit it should not be used. Note that Enter does not allocate space in
- // the physical frame for storing frame-allocated locals.
- void Enter();
- void Exit();
-
- // Prepare for returning from the frame by spilling locals. This
- // avoids generating unnecessary merge code when jumping to the
- // shared return site. Emits code for spills.
- inline void PrepareForReturn();
-
- // Number of local variables after when we use a loop for allocating.
- static const int kLocalVarBound = 14;
-
- // Allocate and initialize the frame-allocated locals.
- void AllocateStackSlots();
-
- // An element of the expression stack as an assembly operand.
- Operand ElementAt(int index) const {
- return Operand(rsp, index * kPointerSize);
- }
-
- // Random-access store to a frame-top relative frame element. The result
- // becomes owned by the frame and is invalidated.
- void SetElementAt(int index, Result* value);
-
- // Set a frame element to a constant. The index is frame-top relative.
- inline void SetElementAt(int index, Handle<Object> value);
-
- void PushElementAt(int index) {
- PushFrameSlotAt(element_count() - index - 1);
- }
-
- void StoreToElementAt(int index) {
- StoreToFrameSlotAt(element_count() - index - 1);
- }
-
- // A frame-allocated local as an assembly operand.
- Operand LocalAt(int index) {
- ASSERT(0 <= index);
- ASSERT(index < local_count());
- return Operand(rbp, kLocal0Offset - index * kPointerSize);
- }
-
- // Push a copy of the value of a local frame slot on top of the frame.
- void PushLocalAt(int index) {
- PushFrameSlotAt(local0_index() + index);
- }
-
- // Push the value of a local frame slot on top of the frame and invalidate
- // the local slot. The slot should be written to before trying to read
- // from it again.
- void TakeLocalAt(int index) {
- TakeFrameSlotAt(local0_index() + index);
- }
-
- // Store the top value on the virtual frame into a local frame slot. The
- // value is left in place on top of the frame.
- void StoreToLocalAt(int index) {
- StoreToFrameSlotAt(local0_index() + index);
- }
-
- // Push the address of the receiver slot on the frame.
- void PushReceiverSlotAddress();
-
- // Push the function on top of the frame.
- void PushFunction() { PushFrameSlotAt(function_index()); }
-
- // Save the value of the esi register to the context frame slot.
- void SaveContextRegister();
-
- // Restore the esi register from the value of the context frame
- // slot.
- void RestoreContextRegister();
-
- // A parameter as an assembly operand.
- Operand ParameterAt(int index) {
- ASSERT(-1 <= index); // -1 is the receiver.
- ASSERT(index < parameter_count());
- return Operand(rbp, (1 + parameter_count() - index) * kPointerSize);
- }
-
- // Push a copy of the value of a parameter frame slot on top of the frame.
- void PushParameterAt(int index) {
- PushFrameSlotAt(param0_index() + index);
- }
-
- // Push the value of a paramter frame slot on top of the frame and
- // invalidate the parameter slot. The slot should be written to before
- // trying to read from it again.
- void TakeParameterAt(int index) {
- TakeFrameSlotAt(param0_index() + index);
- }
-
- // Store the top value on the virtual frame into a parameter frame slot.
- // The value is left in place on top of the frame.
- void StoreToParameterAt(int index) {
- StoreToFrameSlotAt(param0_index() + index);
- }
-
- // The receiver frame slot.
- Operand Receiver() { return ParameterAt(-1); }
-
- // Push a try-catch or try-finally handler on top of the virtual frame.
- void PushTryHandler(HandlerType type);
-
- // Call stub given the number of arguments it expects on (and
- // removes from) the stack.
- inline Result CallStub(CodeStub* stub, int arg_count);
-
- // Call stub that takes a single argument passed in eax. The
- // argument is given as a result which does not have to be eax or
- // even a register. The argument is consumed by the call.
- Result CallStub(CodeStub* stub, Result* arg);
-
- // Call stub that takes a pair of arguments passed in edx (arg0, rdx) and
- // eax (arg1, rax). The arguments are given as results which do not have
- // to be in the proper registers or even in registers. The
- // arguments are consumed by the call.
- Result CallStub(CodeStub* stub, Result* arg0, Result* arg1);
-
- // Call JS function from top of the stack with arguments
- // taken from the stack.
- Result CallJSFunction(int arg_count);
-
- // Call runtime given the number of arguments expected on (and
- // removed from) the stack.
- Result CallRuntime(const Runtime::Function* f, int arg_count);
- Result CallRuntime(Runtime::FunctionId id, int arg_count);
-
-#ifdef ENABLE_DEBUGGER_SUPPORT
- void DebugBreak();
-#endif
-
- // Invoke builtin given the number of arguments it expects on (and
- // removes from) the stack.
- Result InvokeBuiltin(Builtins::JavaScript id,
- InvokeFlag flag,
- int arg_count);
-
- // Call load IC. Name and receiver are found on top of the frame.
- // Both are dropped.
- Result CallLoadIC(RelocInfo::Mode mode);
-
- // Call keyed load IC. Key and receiver are found on top of the
- // frame. Both are dropped.
- Result CallKeyedLoadIC(RelocInfo::Mode mode);
-
- // Call store IC. If the load is contextual, value is found on top of the
- // frame. If not, value and receiver are on the frame. Both are dropped.
- Result CallStoreIC(Handle<String> name, bool is_contextual,
- StrictModeFlag strict_mode);
-
- // Call keyed store IC. Value, key, and receiver are found on top
- Result CallKeyedStoreIC(StrictModeFlag strict_mode);
-
- // Call call IC. Function name, arguments, and receiver are found on top
- // of the frame and dropped by the call.
- // The argument count does not include the receiver.
- Result CallCallIC(RelocInfo::Mode mode, int arg_count, int loop_nesting);
-
- // Call keyed call IC. Same calling convention as CallCallIC.
- Result CallKeyedCallIC(RelocInfo::Mode mode, int arg_count, int loop_nesting);
-
- // Allocate and call JS function as constructor. Arguments,
- // receiver (global object), and function are found on top of the
- // frame. Function is not dropped. The argument count does not
- // include the receiver.
- Result CallConstructor(int arg_count);
-
- // Drop a number of elements from the top of the expression stack. May
- // emit code to affect the physical frame. Does not clobber any registers
- // excepting possibly the stack pointer.
- void Drop(int count);
-
- // Drop one element.
- void Drop() { Drop(1); }
-
- // Duplicate the top element of the frame.
- void Dup() { PushFrameSlotAt(element_count() - 1); }
-
- // Duplicate the n'th element from the top of the frame.
- // Dup(1) is equivalent to Dup().
- void Dup(int n) {
- ASSERT(n > 0);
- PushFrameSlotAt(element_count() - n);
- }
-
- // Pop an element from the top of the expression stack. Returns a
- // Result, which may be a constant or a register.
- Result Pop();
-
- // Pop and save an element from the top of the expression stack and
- // emit a corresponding pop instruction.
- void EmitPop(Register reg);
- void EmitPop(const Operand& operand);
-
- // Push an element on top of the expression stack and emit a
- // corresponding push instruction.
- void EmitPush(Register reg,
- TypeInfo info = TypeInfo::Unknown());
- void EmitPush(const Operand& operand,
- TypeInfo info = TypeInfo::Unknown());
- void EmitPush(Heap::RootListIndex index,
- TypeInfo info = TypeInfo::Unknown());
- void EmitPush(Immediate immediate,
- TypeInfo info = TypeInfo::Unknown());
- void EmitPush(Smi* value);
- // Uses kScratchRegister, emits appropriate relocation info.
- void EmitPush(Handle<Object> value);
-
- inline bool ConstantPoolOverflowed();
-
- // Push an element on the virtual frame.
- void Push(Handle<Object> value);
- inline void Push(Register reg, TypeInfo info = TypeInfo::Unknown());
- inline void Push(Smi* value);
-
- // Pushing a result invalidates it (its contents become owned by the
- // frame).
- void Push(Result* result) {
- if (result->is_register()) {
- Push(result->reg(), result->type_info());
- } else {
- ASSERT(result->is_constant());
- Push(result->handle());
- }
- result->Unuse();
- }
-
- // Pushing an expression expects that the expression is trivial (according
- // to Expression::IsTrivial).
- void Push(Expression* expr);
-
- // Nip removes zero or more elements from immediately below the top
- // of the frame, leaving the previous top-of-frame value on top of
- // the frame. Nip(k) is equivalent to x = Pop(), Drop(k), Push(x).
- inline void Nip(int num_dropped);
-
- inline void SetTypeForLocalAt(int index, TypeInfo info);
- inline void SetTypeForParamAt(int index, TypeInfo info);
-
- private:
- static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset;
- static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset;
- static const int kContextOffset = StandardFrameConstants::kContextOffset;
-
- static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize;
- static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots.
-
- ZoneList<FrameElement> elements_;
-
- // The index of the element that is at the processor's stack pointer
- // (the esp register).
- int stack_pointer_;
-
- // The index of the register frame element using each register, or
- // kIllegalIndex if a register is not on the frame.
- int register_locations_[RegisterAllocator::kNumRegisters];
-
- // The number of frame-allocated locals and parameters respectively.
- inline int parameter_count();
- inline int local_count();
-
- // The index of the element that is at the processor's frame pointer
- // (the ebp register). The parameters, receiver, and return address
- // are below the frame pointer.
- int frame_pointer() { return parameter_count() + 2; }
-
- // The index of the first parameter. The receiver lies below the first
- // parameter.
- int param0_index() { return 1; }
-
- // The index of the context slot in the frame. It is immediately
- // above the frame pointer.
- int context_index() { return frame_pointer() + 1; }
-
- // The index of the function slot in the frame. It is above the frame
- // pointer and the context slot.
- int function_index() { return frame_pointer() + 2; }
-
- // The index of the first local. Between the frame pointer and the
- // locals lie the context and the function.
- int local0_index() { return frame_pointer() + 3; }
-
- // The index of the base of the expression stack.
- int expression_base_index() { return local0_index() + local_count(); }
-
- // Convert a frame index into a frame pointer relative offset into the
- // actual stack.
- int fp_relative(int index) {
- ASSERT(index < element_count());
- ASSERT(frame_pointer() < element_count()); // FP is on the frame.
- return (frame_pointer() - index) * kPointerSize;
- }
-
- // Record an occurrence of a register in the virtual frame. This has the
- // effect of incrementing the register's external reference count and
- // of updating the index of the register's location in the frame.
- void Use(Register reg, int index) {
- ASSERT(!is_used(reg));
- set_register_location(reg, index);
- cgen()->allocator()->Use(reg);
- }
-
- // Record that a register reference has been dropped from the frame. This
- // decrements the register's external reference count and invalidates the
- // index of the register's location in the frame.
- void Unuse(Register reg) {
- ASSERT(is_used(reg));
- set_register_location(reg, kIllegalIndex);
- cgen()->allocator()->Unuse(reg);
- }
-
- // Spill the element at a particular index---write it to memory if
- // necessary, free any associated register, and forget its value if
- // constant.
- void SpillElementAt(int index);
-
- // Sync the element at a particular index. If it is a register or
- // constant that disagrees with the value on the stack, write it to memory.
- // Keep the element type as register or constant, and clear the dirty bit.
- void SyncElementAt(int index);
-
- // Sync a single unsynced element that lies beneath or at the stack pointer.
- void SyncElementBelowStackPointer(int index);
-
- // Sync a single unsynced element that lies just above the stack pointer.
- void SyncElementByPushing(int index);
-
- // Push a copy of a frame slot (typically a local or parameter) on top of
- // the frame.
- inline void PushFrameSlotAt(int index);
-
- // Push a the value of a frame slot (typically a local or parameter) on
- // top of the frame and invalidate the slot.
- void TakeFrameSlotAt(int index);
-
- // Store the value on top of the frame to a frame slot (typically a local
- // or parameter).
- void StoreToFrameSlotAt(int index);
-
- // Spill all elements in registers. Spill the top spilled_args elements
- // on the frame. Sync all other frame elements.
- // Then drop dropped_args elements from the virtual frame, to match
- // the effect of an upcoming call that will drop them from the stack.
- void PrepareForCall(int spilled_args, int dropped_args);
-
- // Move frame elements currently in registers or constants, that
- // should be in memory in the expected frame, to memory.
- void MergeMoveRegistersToMemory(VirtualFrame* expected);
-
- // Make the register-to-register moves necessary to
- // merge this frame with the expected frame.
- // Register to memory moves must already have been made,
- // and memory to register moves must follow this call.
- // This is because some new memory-to-register moves are
- // created in order to break cycles of register moves.
- // Used in the implementation of MergeTo().
- void MergeMoveRegistersToRegisters(VirtualFrame* expected);
-
- // Make the memory-to-register and constant-to-register moves
- // needed to make this frame equal the expected frame.
- // Called after all register-to-memory and register-to-register
- // moves have been made. After this function returns, the frames
- // should be equal.
- void MergeMoveMemoryToRegisters(VirtualFrame* expected);
-
- // Invalidates a frame slot (puts an invalid frame element in it).
- // Copies on the frame are correctly handled, and if this slot was
- // the backing store of copies, the index of the new backing store
- // is returned. Otherwise, returns kIllegalIndex.
- // Register counts are correctly updated.
- int InvalidateFrameSlotAt(int index);
-
- // This function assumes that a and b are the only results that could be in
- // the registers a_reg or b_reg. Other results can be live, but must not
- // be in the registers a_reg or b_reg. The results a and b are invalidated.
- void MoveResultsToRegisters(Result* a,
- Result* b,
- Register a_reg,
- Register b_reg);
-
- // Call a code stub that has already been prepared for calling (via
- // PrepareForCall).
- Result RawCallStub(CodeStub* stub);
-
- // Calls a code object which has already been prepared for calling
- // (via PrepareForCall).
- Result RawCallCodeObject(Handle<Code> code, RelocInfo::Mode rmode);
-
- inline bool Equals(VirtualFrame* other);
-
- // Classes that need raw access to the elements_ array.
- friend class FrameRegisterState;
- friend class JumpTarget;
-};
-
-
-} } // namespace v8::internal
-
-#endif // V8_X64_VIRTUAL_FRAME_X64_H_
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
#include "isolate.h"
#include "cctest.h"
#include "disassembler.h"
-#include "register-allocator-inl.h"
#include "vm-state-inl.h"
using v8::Function;
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