--- /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 "debug.h"
+#include "fast-codegen.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm_)
+
+// Generate code for a JS function. On entry to the function the receiver
+// and arguments have been pushed on the stack left to right, with the
+// return address on top of them. The actual argument count matches the
+// formal parameter count expected by the function.
+//
+// The live registers are:
+// o rdi: the JS function object being called (ie, ourselves)
+// o rsi: our context
+// o rbp: our caller's frame pointer
+// o rsp: stack pointer (pointing to return address)
+//
+// The function builds a JS frame. Please see JavaScriptFrameConstants in
+// frames-x64.h for its layout.
+void FastCodeGenerator::Generate(FunctionLiteral* fun) {
+ function_ = fun;
+
+ __ push(rbp); // Caller's frame pointer.
+ __ movq(rbp, rsp);
+ __ push(rsi); // Callee's context.
+ __ push(rdi); // Callee's JS Function.
+
+ { Comment cmnt(masm_, "[ Allocate locals");
+ int locals_count = fun->scope()->num_stack_slots();
+ for (int i = 0; i < locals_count; i++) {
+ __ PushRoot(Heap::kUndefinedValueRootIndex);
+ }
+ }
+
+ { Comment cmnt(masm_, "[ Stack check");
+ Label ok;
+ __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
+ __ j(above_equal, &ok);
+ StackCheckStub stub;
+ __ CallStub(&stub);
+ __ bind(&ok);
+ }
+
+ { Comment cmnt(masm_, "[ Body");
+ VisitStatements(fun->body());
+ }
+
+ { Comment cmnt(masm_, "[ return <undefined>;");
+ // Emit a 'return undefined' in case control fell off the end of the
+ // body.
+ __ LoadRoot(rax, Heap::kUndefinedValueRootIndex);
+ __ RecordJSReturn();
+ // Do not use the leave instruction here because it is too short to
+ // patch with the code required by the debugger.
+ __ movq(rsp, rbp);
+ __ pop(rbp);
+ __ ret((fun->scope()->num_parameters() + 1) * kPointerSize);
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ // Add padding that will be overwritten by a debugger breakpoint. We
+ // have just generated "movq rsp, rbp; pop rbp; ret k" with length 7
+ // (3 + 1 + 3).
+ const int kPadding = Debug::kX64JSReturnSequenceLength - 7;
+ for (int i = 0; i < kPadding; ++i) {
+ masm_->int3();
+ }
+#endif
+ }
+}
+
+
+void FastCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
+ Comment cmnt(masm_, "[ ExpressionStatement");
+ Visit(stmt->expression());
+ __ pop(rax);
+}
+
+
+void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
+ Comment cmnt(masm_, "[ ReturnStatement");
+ Visit(stmt->expression());
+ __ pop(rax);
+ __ RecordJSReturn();
+ // Do not use the leave instruction here because it is too short to
+ // patch with the code required by the debugger.
+ __ movq(rsp, rbp);
+ __ pop(rbp);
+ __ ret((function_->scope()->num_parameters() + 1) * kPointerSize);
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ // Add padding that will be overwritten by a debugger breakpoint. We
+ // have just generated "movq rsp, rbp; pop rbp; ret k" with length 7
+ // (3 + 1 + 3).
+ const int kPadding = Debug::kX64JSReturnSequenceLength - 7;
+ for (int i = 0; i < kPadding; ++i) {
+ masm_->int3();
+ }
+#endif
+}
+
+
+void FastCodeGenerator::VisitSlot(Slot* expr) {
+ Comment cmnt(masm_, "[ Slot");
+ __ push(Operand(rbp, SlotOffset(expr)));
+}
+
+
+void FastCodeGenerator::VisitLiteral(Literal* expr) {
+ Comment cmnt(masm_, "[ Literal");
+ __ Push(expr->handle());
+}
+
+
+void FastCodeGenerator::VisitAssignment(Assignment* expr) {
+ Comment cmnt(masm_, "[ Assignment");
+ ASSERT(expr->op() == Token::ASSIGN || expr->op() == Token::INIT_VAR);
+
+ Visit(expr->value());
+
+ Variable* var = expr->target()->AsVariableProxy()->AsVariable();
+ ASSERT(var != NULL && var->slot() != NULL);
+ __ movq(rax, Operand(rsp, 0));
+ __ movq(Operand(rbp, SlotOffset(var->slot())), rax);
+}
+
+
+} } // namespace v8::internal
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