}
+void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add("if is_string(");
+ InputAt(0)->PrintTo(stream);
+ stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
stream->Add("if is_smi(");
InputAt(0)->PrintTo(stream);
}
+void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add("if string_compare(");
+ InputAt(0)->PrintTo(stream);
+ InputAt(1)->PrintTo(stream);
+ stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
stream->Add("if has_instance_type(");
InputAt(0)->PrintTo(stream);
}
+LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
+ ASSERT(instr->value()->representation().IsTagged());
+ LOperand* temp = TempRegister();
+ return new LIsStringAndBranch(UseRegisterAtStart(instr->value()), temp);
+}
+
+
LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
ASSERT(instr->value()->representation().IsTagged());
return new LIsSmiAndBranch(Use(instr->value()));
}
+LInstruction* LChunkBuilder::DoStringCompareAndBranch(
+ HStringCompareAndBranch* instr) {
+ ASSERT(instr->left()->representation().IsTagged());
+ ASSERT(instr->right()->representation().IsTagged());
+ LOperand* left = UseFixed(instr->left(), r1);
+ LOperand* right = UseFixed(instr->right(), r0);
+ LStringCompareAndBranch* result = new LStringCompareAndBranch(left, right);
+ return MarkAsCall(result, instr);
+}
+
+
LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
HHasInstanceTypeAndBranch* instr) {
ASSERT(instr->value()->representation().IsTagged());
V(IsConstructCallAndBranch) \
V(IsNilAndBranch) \
V(IsObjectAndBranch) \
+ V(IsStringAndBranch) \
V(IsSmiAndBranch) \
V(IsUndetectableAndBranch) \
+ V(StringCompareAndBranch) \
V(JSArrayLength) \
V(Label) \
V(LazyBailout) \
};
+class LIsStringAndBranch: public LControlInstruction<1, 1> {
+ public:
+ LIsStringAndBranch(LOperand* value, LOperand* temp) {
+ inputs_[0] = value;
+ temps_[0] = temp;
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(IsStringAndBranch, "is-string-and-branch")
+ DECLARE_HYDROGEN_ACCESSOR(IsStringAndBranch)
+
+ virtual void PrintDataTo(StringStream* stream);
+};
+
+
class LIsSmiAndBranch: public LControlInstruction<1, 0> {
public:
explicit LIsSmiAndBranch(LOperand* value) {
};
+class LStringCompareAndBranch: public LControlInstruction<2, 0> {
+ public:
+ LStringCompareAndBranch(LOperand* left, LOperand* right) {
+ inputs_[0] = left;
+ inputs_[1] = right;
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch,
+ "string-compare-and-branch")
+ DECLARE_HYDROGEN_ACCESSOR(StringCompareAndBranch)
+
+ Token::Value op() const { return hydrogen()->token(); }
+
+ virtual void PrintDataTo(StringStream* stream);
+};
+
+
class LHasInstanceTypeAndBranch: public LControlInstruction<1, 0> {
public:
explicit LHasInstanceTypeAndBranch(LOperand* value) {
}
+Condition LCodeGen::EmitIsString(Register input,
+ Register temp1,
+ Label* is_not_string) {
+ __ JumpIfSmi(input, is_not_string);
+ __ CompareObjectType(input, temp1, temp1, FIRST_NONSTRING_TYPE);
+
+ return lt;
+}
+
+
+void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
+ Register reg = ToRegister(instr->InputAt(0));
+ Register temp1 = ToRegister(instr->TempAt(0));
+
+ int true_block = chunk_->LookupDestination(instr->true_block_id());
+ int false_block = chunk_->LookupDestination(instr->false_block_id());
+ Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+ Condition true_cond =
+ EmitIsString(reg, temp1, false_label);
+
+ EmitBranch(true_block, false_block, true_cond);
+}
+
+
void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
int true_block = chunk_->LookupDestination(instr->true_block_id());
int false_block = chunk_->LookupDestination(instr->false_block_id());
}
+static Condition ComputeCompareCondition(Token::Value op) {
+ switch (op) {
+ case Token::EQ_STRICT:
+ case Token::EQ:
+ return eq;
+ case Token::LT:
+ return lt;
+ case Token::GT:
+ return gt;
+ case Token::LTE:
+ return le;
+ case Token::GTE:
+ return ge;
+ default:
+ UNREACHABLE();
+ return kNoCondition;
+ }
+}
+
+
+void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
+ Token::Value op = instr->op();
+ int true_block = chunk_->LookupDestination(instr->true_block_id());
+ int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+ Handle<Code> ic = CompareIC::GetUninitialized(op);
+ CallCode(ic, RelocInfo::CODE_TARGET, instr);
+ __ cmp(r0, Operand(0)); // This instruction also signals no smi code inlined.
+
+ Condition condition = ComputeCompareCondition(op);
+
+ EmitBranch(true_block, false_block, condition);
+}
+
+
static InstanceType TestType(HHasInstanceTypeAndBranch* instr) {
InstanceType from = instr->from();
InstanceType to = instr->to();
}
-static Condition ComputeCompareCondition(Token::Value op) {
- switch (op) {
- case Token::EQ_STRICT:
- case Token::EQ:
- return eq;
- case Token::LT:
- return lt;
- case Token::GT:
- return gt;
- case Token::LTE:
- return le;
- case Token::GTE:
- return ge;
- default:
- UNREACHABLE();
- return kNoCondition;
- }
-}
-
-
void LCodeGen::DoCmpT(LCmpT* instr) {
Token::Value op = instr->op();
Label* is_not_object,
Label* is_object);
+ // Emits optimized code for %_IsString(x). Preserves input register.
+ // Returns the condition on which a final split to
+ // true and false label should be made, to optimize fallthrough.
+ Condition EmitIsString(Register input,
+ Register temp1,
+ Label* is_not_string);
+
// Emits optimized code for %_IsConstructCall().
// Caller should branch on equal condition.
void EmitIsConstructCall(Register temp1, Register temp2);
TypeInfo info = oracle->SwitchType(this);
if (info.IsSmi()) {
compare_type_ = SMI_ONLY;
+ } else if (info.IsSymbol()) {
+ compare_type_ = SYMBOL_ONLY;
+ } else if (info.IsNonSymbol()) {
+ compare_type_ = STRING_ONLY;
} else if (info.IsNonPrimitive()) {
compare_type_ = OBJECT_ONLY;
} else {
// Type feedback information.
void RecordTypeFeedback(TypeFeedbackOracle* oracle);
bool IsSmiCompare() { return compare_type_ == SMI_ONLY; }
+ bool IsSymbolCompare() { return compare_type_ == SYMBOL_ONLY; }
+ bool IsStringCompare() { return compare_type_ == STRING_ONLY; }
bool IsObjectCompare() { return compare_type_ == OBJECT_ONLY; }
private:
Label body_target_;
ZoneList<Statement*>* statements_;
int position_;
- enum CompareTypeFeedback { NONE, SMI_ONLY, OBJECT_ONLY };
+ enum CompareTypeFeedback {
+ NONE,
+ SMI_ONLY,
+ SYMBOL_ONLY,
+ STRING_ONLY,
+ OBJECT_ONLY
+ };
CompareTypeFeedback compare_type_;
int compare_id_;
int entry_id_;
}
+void HStringCompareAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add(Token::Name(token()));
+ stream->Add(" ");
+ HControlInstruction::PrintDataTo(stream);
+}
+
+
void HCompareIDAndBranch::PrintDataTo(StringStream* stream) {
stream->Add(Token::Name(token()));
stream->Add(" ");
V(IsConstructCallAndBranch) \
V(IsNilAndBranch) \
V(IsObjectAndBranch) \
+ V(IsStringAndBranch) \
V(IsSmiAndBranch) \
V(IsUndetectableAndBranch) \
+ V(StringCompareAndBranch) \
V(JSArrayLength) \
V(LeaveInlined) \
V(LoadContextSlot) \
DECLARE_CONCRETE_INSTRUCTION(IsObjectAndBranch)
};
+class HIsStringAndBranch: public HUnaryControlInstruction {
+ public:
+ explicit HIsStringAndBranch(HValue* value)
+ : HUnaryControlInstruction(value, NULL, NULL) { }
+
+ virtual Representation RequiredInputRepresentation(int index) {
+ return Representation::Tagged();
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(IsStringAndBranch)
+};
+
class HIsSmiAndBranch: public HUnaryControlInstruction {
public:
};
+class HStringCompareAndBranch: public HTemplateControlInstruction<2, 3> {
+ public:
+ HStringCompareAndBranch(HValue* context,
+ HValue* left,
+ HValue* right,
+ Token::Value token)
+ : token_(token) {
+ ASSERT(Token::IsCompareOp(token));
+ SetOperandAt(0, context);
+ SetOperandAt(1, left);
+ SetOperandAt(2, right);
+ set_representation(Representation::Tagged());
+ }
+
+ HValue* context() { return OperandAt(0); }
+ HValue* left() { return OperandAt(1); }
+ HValue* right() { return OperandAt(2); }
+ Token::Value token() const { return token_; }
+
+ virtual void PrintDataTo(StringStream* stream);
+
+ virtual Representation RequiredInputRepresentation(int index) {
+ return Representation::Tagged();
+ }
+
+ Representation GetInputRepresentation() const {
+ return Representation::Tagged();
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch)
+
+ private:
+ Token::Value token_;
+};
+
+
class HIsConstructCallAndBranch: public HTemplateControlInstruction<2, 0> {
public:
virtual Representation RequiredInputRepresentation(int index) {
Postorder(it.Current(), visited, order, block);
}
} else {
+ ASSERT(block->IsFinished());
for (HSuccessorIterator it(block->end()); !it.Done(); it.Advance()) {
Postorder(it.Current(), visited, order, loop_header);
}
return Bailout("SwitchStatement: too many clauses");
}
+ HValue* context = environment()->LookupContext();
+
CHECK_ALIVE(VisitForValue(stmt->tag()));
AddSimulate(stmt->EntryId());
HValue* tag_value = Pop();
HBasicBlock* first_test_block = current_block();
- // 1. Build all the tests, with dangling true branches. Unconditionally
- // deoptimize if we encounter a non-smi comparison.
+ SwitchType switch_type = UNKNOWN_SWITCH;
+
+ // 1. Extract clause type
for (int i = 0; i < clause_count; ++i) {
CaseClause* clause = clauses->at(i);
if (clause->is_default()) continue;
- if (!clause->label()->IsSmiLiteral()) {
- return Bailout("SwitchStatement: non-literal switch label");
+
+ if (switch_type == UNKNOWN_SWITCH) {
+ if (clause->label()->IsSmiLiteral()) {
+ switch_type = SMI_SWITCH;
+ } else if (clause->label()->IsStringLiteral()) {
+ switch_type = STRING_SWITCH;
+ } else {
+ return Bailout("SwitchStatement: non-literal switch label");
+ }
+ } else if ((switch_type == STRING_SWITCH &&
+ !clause->label()->IsStringLiteral()) ||
+ (switch_type == SMI_SWITCH &&
+ !clause->label()->IsSmiLiteral())) {
+ return Bailout("SwitchStatemnt: mixed label types are not supported");
}
+ }
- // Unconditionally deoptimize on the first non-smi compare.
- clause->RecordTypeFeedback(oracle());
- if (!clause->IsSmiCompare()) {
- // Finish with deoptimize and add uses of enviroment values to
- // account for invisible uses.
- current_block()->FinishExitWithDeoptimization(HDeoptimize::kUseAll);
- set_current_block(NULL);
- break;
+ HUnaryControlInstruction* string_check = NULL;
+ HBasicBlock* not_string_block = NULL;
+
+ // Test switch's tag value if all clauses are string literals
+ if (switch_type == STRING_SWITCH) {
+ string_check = new(zone()) HIsStringAndBranch(tag_value);
+ first_test_block = graph()->CreateBasicBlock();
+ not_string_block = graph()->CreateBasicBlock();
+
+ string_check->SetSuccessorAt(0, first_test_block);
+ string_check->SetSuccessorAt(1, not_string_block);
+ current_block()->Finish(string_check);
+
+ set_current_block(first_test_block);
+ }
+
+ // 2. Build all the tests, with dangling true branches
+ for (int i = 0; i < clause_count; ++i) {
+ CaseClause* clause = clauses->at(i);
+ if (clause->is_default()) continue;
+
+ if (switch_type == SMI_SWITCH) {
+ clause->RecordTypeFeedback(oracle());
}
- // Otherwise generate a compare and branch.
+ // Generate a compare and branch.
CHECK_ALIVE(VisitForValue(clause->label()));
HValue* label_value = Pop();
- HCompareIDAndBranch* compare =
- new(zone()) HCompareIDAndBranch(tag_value,
- label_value,
- Token::EQ_STRICT);
- compare->SetInputRepresentation(Representation::Integer32());
- HBasicBlock* body_block = graph()->CreateBasicBlock();
+
HBasicBlock* next_test_block = graph()->CreateBasicBlock();
+ HBasicBlock* body_block = graph()->CreateBasicBlock();
+
+ HControlInstruction* compare;
+
+ if (switch_type == SMI_SWITCH) {
+ if (!clause->IsSmiCompare()) {
+ // Finish with deoptimize and add uses of enviroment values to
+ // account for invisible uses.
+ current_block()->FinishExitWithDeoptimization(HDeoptimize::kUseAll);
+ set_current_block(NULL);
+ break;
+ }
+
+ HCompareIDAndBranch* compare_ =
+ new(zone()) HCompareIDAndBranch(tag_value,
+ label_value,
+ Token::EQ_STRICT);
+ compare_->SetInputRepresentation(Representation::Integer32());
+ compare = compare_;
+ } else {
+ compare = new(zone()) HStringCompareAndBranch(context, tag_value,
+ label_value,
+ Token::EQ_STRICT);
+ }
+
compare->SetSuccessorAt(0, body_block);
compare->SetSuccessorAt(1, next_test_block);
current_block()->Finish(compare);
+
set_current_block(next_test_block);
}
// exit. This block is NULL if we deoptimized.
HBasicBlock* last_block = current_block();
- // 2. Loop over the clauses and the linked list of tests in lockstep,
+ if (not_string_block != NULL) {
+ last_block = CreateJoin(last_block, not_string_block, stmt->ExitId());
+ }
+
+ // 3. Loop over the clauses and the linked list of tests in lockstep,
// translating the clause bodies.
HBasicBlock* curr_test_block = first_test_block;
HBasicBlock* fall_through_block = NULL;
+
BreakAndContinueInfo break_info(stmt);
{ BreakAndContinueScope push(&break_info, this);
for (int i = 0; i < clause_count; ++i) {
class HGraphBuilder: public AstVisitor {
public:
enum BreakType { BREAK, CONTINUE };
+ enum SwitchType { UNKNOWN_SWITCH, SMI_SWITCH, STRING_SWITCH };
// A class encapsulating (lazily-allocated) break and continue blocks for
// a breakable statement. Separated from BreakAndContinueScope so that it
}
+Condition LCodeGen::EmitIsString(Register input,
+ Register temp1,
+ Label* is_not_string) {
+ __ JumpIfSmi(input, is_not_string);
+
+ Condition cond = masm_->IsObjectStringType(input, temp1, temp1);
+
+ return cond;
+}
+
+
+void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
+ Register reg = ToRegister(instr->InputAt(0));
+ Register temp = ToRegister(instr->TempAt(0));
+
+ int true_block = chunk_->LookupDestination(instr->true_block_id());
+ int false_block = chunk_->LookupDestination(instr->false_block_id());
+ Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+ Condition true_cond = EmitIsString(reg, temp, false_label);
+
+ EmitBranch(true_block, false_block, true_cond);
+}
+
+
void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
Operand input = ToOperand(instr->InputAt(0));
}
+static Condition ComputeCompareCondition(Token::Value op) {
+ switch (op) {
+ case Token::EQ_STRICT:
+ case Token::EQ:
+ return equal;
+ case Token::LT:
+ return less;
+ case Token::GT:
+ return greater;
+ case Token::LTE:
+ return less_equal;
+ case Token::GTE:
+ return greater_equal;
+ default:
+ UNREACHABLE();
+ return no_condition;
+ }
+}
+
+
+void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
+ Token::Value op = instr->op();
+ int true_block = chunk_->LookupDestination(instr->true_block_id());
+ int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+ Handle<Code> ic = CompareIC::GetUninitialized(op);
+ CallCode(ic, RelocInfo::CODE_TARGET, instr);
+
+ Condition condition = ComputeCompareCondition(op);
+ __ test(eax, Operand(eax));
+
+ EmitBranch(true_block, false_block, condition);
+}
+
+
static InstanceType TestType(HHasInstanceTypeAndBranch* instr) {
InstanceType from = instr->from();
InstanceType to = instr->to();
}
-static Condition ComputeCompareCondition(Token::Value op) {
- switch (op) {
- case Token::EQ_STRICT:
- case Token::EQ:
- return equal;
- case Token::LT:
- return less;
- case Token::GT:
- return greater;
- case Token::LTE:
- return less_equal;
- case Token::GTE:
- return greater_equal;
- default:
- UNREACHABLE();
- return no_condition;
- }
-}
-
-
void LCodeGen::DoCmpT(LCmpT* instr) {
Token::Value op = instr->op();
Label* is_not_object,
Label* is_object);
+ // Emits optimized code for %_IsString(x). Preserves input register.
+ // Returns the condition on which a final split to
+ // true and false label should be made, to optimize fallthrough.
+ Condition EmitIsString(Register input,
+ Register temp1,
+ Label* is_not_string);
+
// Emits optimized code for %_IsConstructCall().
// Caller should branch on equal condition.
void EmitIsConstructCall(Register temp);
}
+void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add("if is_string(");
+ InputAt(0)->PrintTo(stream);
+ stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
stream->Add("if is_smi(");
InputAt(0)->PrintTo(stream);
}
+void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add("if string_compare(");
+ InputAt(1)->PrintTo(stream);
+ InputAt(2)->PrintTo(stream);
+ stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
stream->Add("if has_instance_type(");
InputAt(0)->PrintTo(stream);
}
+LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
+ ASSERT(instr->value()->representation().IsTagged());
+ LOperand* temp = TempRegister();
+ return new LIsStringAndBranch(UseRegister(instr->value()), temp);
+}
+
+
LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
ASSERT(instr->value()->representation().IsTagged());
return new(zone()) LIsSmiAndBranch(Use(instr->value()));
}
+LInstruction* LChunkBuilder::DoStringCompareAndBranch(
+ HStringCompareAndBranch* instr) {
+ ASSERT(instr->left()->representation().IsTagged());
+ ASSERT(instr->right()->representation().IsTagged());
+ LOperand* context = UseFixed(instr->context(), esi);
+ LOperand* left = UseFixed(instr->left(), edx);
+ LOperand* right = UseFixed(instr->right(), eax);
+
+ LStringCompareAndBranch* result = new
+ LStringCompareAndBranch(context, left, right);
+
+ return MarkAsCall(result, instr);
+}
+
+
LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
HHasInstanceTypeAndBranch* instr) {
ASSERT(instr->value()->representation().IsTagged());
V(IsConstructCallAndBranch) \
V(IsNilAndBranch) \
V(IsObjectAndBranch) \
+ V(IsStringAndBranch) \
V(IsSmiAndBranch) \
V(IsUndetectableAndBranch) \
+ V(StringCompareAndBranch) \
V(JSArrayLength) \
V(Label) \
V(LazyBailout) \
};
+class LIsStringAndBranch: public LControlInstruction<1, 1> {
+ public:
+ LIsStringAndBranch(LOperand* value, LOperand* temp) {
+ inputs_[0] = value;
+ temps_[0] = temp;
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(IsStringAndBranch, "is-string-and-branch")
+
+ virtual void PrintDataTo(StringStream* stream);
+};
+
+
class LIsSmiAndBranch: public LControlInstruction<1, 0> {
public:
explicit LIsSmiAndBranch(LOperand* value) {
};
+class LStringCompareAndBranch: public LControlInstruction<3, 0> {
+ public:
+ LStringCompareAndBranch(LOperand* context, LOperand* left, LOperand* right) {
+ inputs_[0] = context;
+ inputs_[1] = left;
+ inputs_[2] = right;
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch,
+ "string-compare-and-branch")
+ DECLARE_HYDROGEN_ACCESSOR(StringCompareAndBranch)
+
+ virtual void PrintDataTo(StringStream* stream);
+
+ Token::Value op() const { return hydrogen()->token(); }
+};
+
+
class LHasInstanceTypeAndBranch: public LControlInstruction<1, 1> {
public:
LHasInstanceTypeAndBranch(LOperand* value, LOperand* temp) {
return unknown;
case CompareIC::SMIS:
return TypeInfo::Smi();
+ case CompareIC::STRINGS:
+ return TypeInfo::String();
+ case CompareIC::SYMBOLS:
+ return TypeInfo::Symbol();
case CompareIC::HEAP_NUMBERS:
return TypeInfo::Number();
case CompareIC::OBJECTS:
static TypeInfo Integer32() { return TypeInfo(kInteger32); }
// We know it's a Smi.
static TypeInfo Smi() { return TypeInfo(kSmi); }
+ // We know it's a Symbol.
+ static TypeInfo Symbol() { return TypeInfo(kSymbol); }
// We know it's a heap number.
static TypeInfo Double() { return TypeInfo(kDouble); }
// We know it's a string.
return ((type_ & kSmi) == kSmi);
}
+ inline bool IsSymbol() {
+ ASSERT(type_ != kUninitialized);
+ return ((type_ & kSymbol) == kSymbol);
+ }
+
+ inline bool IsNonSymbol() {
+ ASSERT(type_ != kUninitialized);
+ return ((type_ & kSymbol) == kString);
+ }
+
inline bool IsInteger32() {
ASSERT(type_ != kUninitialized);
return ((type_ & kInteger32) == kInteger32);
case kNumber: return "Number";
case kInteger32: return "Integer32";
case kSmi: return "Smi";
+ case kSymbol: return "Symbol";
case kDouble: return "Double";
case kString: return "String";
case kNonPrimitive: return "Object";
kSmi = 0x17, // 0010111
kDouble = 0x19, // 0011001
kString = 0x30, // 0110000
+ kSymbol = 0x32, // 0110010
kNonPrimitive = 0x40, // 1000000
kUninitialized = 0x7f // 1111111
};
}
+Condition LCodeGen::EmitIsString(Register input,
+ Register temp1,
+ Label* is_not_string) {
+ __ JumpIfSmi(input, is_not_string);
+ Condition cond = masm_->IsObjectStringType(input, temp1, temp1);
+
+ return cond;
+}
+
+
+void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
+ Register reg = ToRegister(instr->InputAt(0));
+ Register temp = ToRegister(instr->TempAt(0));
+
+ int true_block = chunk_->LookupDestination(instr->true_block_id());
+ int false_block = chunk_->LookupDestination(instr->false_block_id());
+ Label* false_label = chunk_->GetAssemblyLabel(false_block);
+
+ Condition true_cond = EmitIsString(reg, temp, false_label);
+
+ EmitBranch(true_block, false_block, true_cond);
+}
+
+
void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
int true_block = chunk_->LookupDestination(instr->true_block_id());
int false_block = chunk_->LookupDestination(instr->false_block_id());
}
+void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
+ Token::Value op = instr->op();
+ int true_block = chunk_->LookupDestination(instr->true_block_id());
+ int false_block = chunk_->LookupDestination(instr->false_block_id());
+
+ Handle<Code> ic = CompareIC::GetUninitialized(op);
+ CallCode(ic, RelocInfo::CODE_TARGET, instr);
+
+ Condition condition = TokenToCondition(op, false);
+ __ testq(rax, rax);
+
+ EmitBranch(true_block, false_block, condition);
+}
+
+
static InstanceType TestType(HHasInstanceTypeAndBranch* instr) {
InstanceType from = instr->from();
InstanceType to = instr->to();
Label* is_not_object,
Label* is_object);
+ // Emits optimized code for %_IsString(x). Preserves input register.
+ // Returns the condition on which a final split to
+ // true and false label should be made, to optimize fallthrough.
+ Condition EmitIsString(Register input,
+ Register temp1,
+ Label* is_not_string);
+
// Emits optimized code for %_IsConstructCall().
// Caller should branch on equal condition.
void EmitIsConstructCall(Register temp);
}
+void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add("if is_string(");
+ InputAt(0)->PrintTo(stream);
+ stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
stream->Add("if is_smi(");
InputAt(0)->PrintTo(stream);
}
+void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
+ stream->Add("if string_compare(");
+ InputAt(0)->PrintTo(stream);
+ InputAt(1)->PrintTo(stream);
+ stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
stream->Add("if has_instance_type(");
InputAt(0)->PrintTo(stream);
}
+LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
+ ASSERT(instr->value()->representation().IsTagged());
+ LOperand* temp = TempRegister();
+ return new LIsStringAndBranch(UseRegisterAtStart(instr->value()), temp);
+}
+
+
LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
ASSERT(instr->value()->representation().IsTagged());
return new LIsSmiAndBranch(Use(instr->value()));
}
+LInstruction* LChunkBuilder::DoStringCompareAndBranch(
+ HStringCompareAndBranch* instr) {
+
+ ASSERT(instr->left()->representation().IsTagged());
+ ASSERT(instr->right()->representation().IsTagged());
+ LOperand* left = UseFixed(instr->left(), rdx);
+ LOperand* right = UseFixed(instr->right(), rax);
+ LStringCompareAndBranch* result = new LStringCompareAndBranch(left, right);
+
+ return MarkAsCall(result, instr);
+}
+
+
LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
HHasInstanceTypeAndBranch* instr) {
ASSERT(instr->value()->representation().IsTagged());
V(IsConstructCallAndBranch) \
V(IsNilAndBranch) \
V(IsObjectAndBranch) \
+ V(IsStringAndBranch) \
V(IsSmiAndBranch) \
V(IsUndetectableAndBranch) \
+ V(StringCompareAndBranch) \
V(JSArrayLength) \
V(Label) \
V(LazyBailout) \
};
+class LIsStringAndBranch: public LControlInstruction<1, 1> {
+ public:
+ explicit LIsStringAndBranch(LOperand* value, LOperand* temp) {
+ inputs_[0] = value;
+ temps_[0] = temp;
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(IsStringAndBranch, "is-string-and-branch")
+ DECLARE_HYDROGEN_ACCESSOR(IsStringAndBranch)
+
+ virtual void PrintDataTo(StringStream* stream);
+};
+
+
class LIsSmiAndBranch: public LControlInstruction<1, 0> {
public:
explicit LIsSmiAndBranch(LOperand* value) {
};
+class LStringCompareAndBranch: public LControlInstruction<2, 0> {
+ public:
+ explicit LStringCompareAndBranch(LOperand* left, LOperand* right) {
+ inputs_[0] = left;
+ inputs_[1] = right;
+ }
+
+ DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch,
+ "string-compare-and-branch")
+ DECLARE_HYDROGEN_ACCESSOR(StringCompareAndBranch)
+
+ virtual void PrintDataTo(StringStream* stream);
+
+ Token::Value op() const { return hydrogen()->token(); }
+};
+
+
class LHasInstanceTypeAndBranch: public LControlInstruction<1, 0> {
public:
explicit LHasInstanceTypeAndBranch(LOperand* value) {
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// Flags: --allow-natives-syntax
+
function f0() {
switch (0) {
// switch deliberately left empty
assertEquals(3, f4(2), "fallthrough-switch.2");
assertEquals(5, f4(3), "fallthrough-switch.3");
+function f4_string(tag, x) {
+ switch(tag) {
+ case 'zero':
+ x++;
+ case 'two':
+ x++;
+ }
+ return x;
+}
+
+// Symbols
+assertEquals(2, f4_string('zero', 0), "fallthrough-string-switch.0");
+assertEquals(1, f4_string('one', 1), "fallthrough-string-switch.1");
+assertEquals(3, f4_string('two', 2), "fallthrough-string-switch.2");
+
+// Strings
+assertEquals(2, f4_string('_zero'.slice(1), 0), "fallthrough-string-switch.3");
+assertEquals(1, f4_string('_one'.slice(1), 1), "fallthrough-string-switch.4");
+assertEquals(3, f4_string('_two'.slice(1), 2), "fallthrough-string-switch.5");
+
+// Oddball
+assertEquals(3, f4_string(null, 3), "fallthrough-string-switch.6");
+
+// Test for regression
+function regress_string(value) {
+ var json = 1;
+ switch (typeof value) {
+ case 'object':
+ break;
+
+ default:
+
+ }
+ return json;
+};
+assertEquals(1, regress_string('object'), 'regression-string');
function f5(x) {
switch(x) {
var verylong = makeVeryLong(verylong_size);
assertEquals(verylong_size * 2 + 1, verylong());
+
+//
+// Test suite below aims to cover all possible combinations of following:
+//
+// clauses | tags | type feedback | optimization
+// =========================================================
+// strings | symbol | all | on
+// smis | string | target | off
+// mixed | oddball | non-target |
+// | smis | none |
+// | heapnum | |
+// =========================================================
+
+// Function-with-switch generator
+var test_id = 0,
+ clause_values = {
+ string: ['abc', 'def', 'ghi', 'jkl'],
+ smi: [1, 2, 3, 4],
+ mixed: ['abc', 1, 'def', 2, 'ghi', 3, 'jkl', 4]
+ };
+
+function switch_gen(clause_type, feedback, optimize) {
+ var values = clause_values[clause_type];
+
+ function opt(fn) {
+ if (feedback === 'all') {
+ values.forEach(fn);
+ } else if (Array.isArray(feedback)) {
+ // Non-target
+ values.filter(function(v) {
+ return feedback.indexOf(v) === -1;
+ }).forEach(fn);
+ } else if (feedback !== undefined) {
+ // Target
+ fn(feedback);
+ } else {
+ // None
+ }
+
+ if (optimize) %OptimizeFunctionOnNextCall(fn);
+
+ return fn;
+ };
+
+ return opt(new Function(
+ 'tag',
+ '"' + (test_id++) + '";' +
+ 'switch(tag) {' +
+ values.map(function(value) {
+ return 'case ' + JSON.stringify(value) + ': return' +
+ JSON.stringify('ok-' + value);
+ }).join(';') +
+ '}'
+ ));
+};
+
+function test_switch(clause_type, test_type, feedback, optimize) {
+ var pairs = [],
+ fn = switch_gen(clause_type, feedback, optimize);
+
+ if (Array.isArray(test_type)) {
+ pairs = test_type.map(function(v) {
+ return {
+ value: v,
+ expected: 'ok-' + v
+ };
+ });
+ } else if (test_type === 'symbols') {
+ pairs = clause_values.string.map(function(v) {
+ return {
+ value: v,
+ expected: clause_type !== 'smi' ? 'ok-' + v : undefined
+ };
+ });
+ } else if (test_type === 'strings') {
+ pairs = clause_values.string.map(function(v) {
+ return {
+ value: ('%%' + v).slice(2),
+ expected: clause_type !== 'smi' ? 'ok-' + v : undefined
+ };
+ });
+ } else if (test_type === 'oddball') {
+ pairs = [
+ { value: null, expected: undefined },
+ { value: NaN, expected: undefined },
+ { value: undefined, expected: undefined }
+ ];
+ } else if (test_type === 'smi') {
+ pairs = clause_values.smi.map(function(v) {
+ return {
+ value: v,
+ expected: clause_type !== 'string' ? 'ok-' + v : undefined
+ };
+ });
+ } else if (test_type === 'heapnum') {
+ pairs = clause_values.smi.map(function(v) {
+ return {
+ value: ((v * 17)/16) - ((v*17)%16/16),
+ expected: clause_type !== 'string' ? 'ok-' + v : undefined
+ };
+ });
+ }
+
+ pairs.forEach(function(pair) {
+ assertEquals(fn(pair.value), pair.expected);
+ });
+};
+
+// test_switch(clause_type, test_type, feedback, optimize);
+
+function test_switches(opt) {
+ var test_types = ['symbols', 'strings', 'oddball', 'smi', 'heapnum'];
+
+ function test(clause_type) {
+ var values = clause_values[clause_type];
+
+ test_types.forEach(function(test_type) {
+ test_switch(clause_type, test_type, 'all', opt);
+ test_switch(clause_type, test_type, 'none', opt);
+
+ // Targeting specific clause feedback
+ values.forEach(function(value) {
+ test_switch(clause_type, test_type, [value], value, opt);
+ test_switch(clause_type, test_type, value, value, opt);
+ });
+ });
+ };
+
+ test('string');
+ test('smi');
+ test('mixed');
+};
+
+test_switches(false);
+test_switches(true);