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1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/interpreter/bytecode-generator.h" | 5 #include "src/interpreter/bytecode-generator.h" |
6 | 6 |
7 #include "src/ast/scopes.h" | 7 #include "src/ast/scopes.h" |
8 #include "src/code-stubs.h" | 8 #include "src/code-stubs.h" |
9 #include "src/compiler.h" | 9 #include "src/compiler.h" |
10 #include "src/interpreter/bytecode-register-allocator.h" | 10 #include "src/interpreter/bytecode-register-allocator.h" |
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759 break; | 759 break; |
760 case VariableLocation::LOOKUP: { | 760 case VariableLocation::LOOKUP: { |
761 DCHECK(IsDeclaredVariableMode(mode)); | 761 DCHECK(IsDeclaredVariableMode(mode)); |
762 | 762 |
763 register_allocator()->PrepareForConsecutiveAllocations(3); | 763 register_allocator()->PrepareForConsecutiveAllocations(3); |
764 Register name = register_allocator()->NextConsecutiveRegister(); | 764 Register name = register_allocator()->NextConsecutiveRegister(); |
765 Register init_value = register_allocator()->NextConsecutiveRegister(); | 765 Register init_value = register_allocator()->NextConsecutiveRegister(); |
766 Register attributes = register_allocator()->NextConsecutiveRegister(); | 766 Register attributes = register_allocator()->NextConsecutiveRegister(); |
767 | 767 |
768 builder()->LoadLiteral(variable->name()).StoreAccumulatorInRegister(name); | 768 builder()->LoadLiteral(variable->name()).StoreAccumulatorInRegister(name); |
769 if (hole_init) { | 769 builder() |
770 builder()->LoadTheHole().StoreAccumulatorInRegister(init_value); | 770 ->LoadLiteral(Smi::FromInt(0)) |
771 } else { | 771 .StoreAccumulatorInRegister(init_value); |
772 // For variables, we must not use an initial value (such as 'undefined') | |
773 // because we may have a (legal) redeclaration and we must not destroy | |
774 // the current value. | |
775 builder() | |
776 ->LoadLiteral(Smi::FromInt(0)) | |
777 .StoreAccumulatorInRegister(init_value); | |
778 } | |
779 builder() | 772 builder() |
780 ->LoadLiteral(Smi::FromInt(variable->DeclarationPropertyAttributes())) | 773 ->LoadLiteral(Smi::FromInt(variable->DeclarationPropertyAttributes())) |
781 .StoreAccumulatorInRegister(attributes) | 774 .StoreAccumulatorInRegister(attributes) |
782 .CallRuntime(Runtime::kDeclareLookupSlot, name, 3); | 775 .CallRuntime(Runtime::kDeclareLookupSlot, name, 3); |
783 break; | 776 break; |
784 } | 777 } |
785 } | 778 } |
786 } | 779 } |
787 | 780 |
788 void BytecodeGenerator::VisitFunctionDeclaration(FunctionDeclaration* decl) { | 781 void BytecodeGenerator::VisitFunctionDeclaration(FunctionDeclaration* decl) { |
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3196 return execution_context()->scope()->language_mode(); | 3189 return execution_context()->scope()->language_mode(); |
3197 } | 3190 } |
3198 | 3191 |
3199 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const { | 3192 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const { |
3200 return TypeFeedbackVector::GetIndex(slot); | 3193 return TypeFeedbackVector::GetIndex(slot); |
3201 } | 3194 } |
3202 | 3195 |
3203 } // namespace interpreter | 3196 } // namespace interpreter |
3204 } // namespace internal | 3197 } // namespace internal |
3205 } // namespace v8 | 3198 } // namespace v8 |
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