| // Copyright 2016 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/builtins/builtins-utils-gen.h" |
| #include "src/builtins/builtins.h" |
| #include "src/code-factory.h" |
| #include "src/code-stub-assembler.h" |
| #include "src/isolate.h" |
| #include "src/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| class GeneratorBuiltinsAssembler : public CodeStubAssembler { |
| public: |
| explicit GeneratorBuiltinsAssembler(compiler::CodeAssemblerState* state) |
| : CodeStubAssembler(state) {} |
| |
| protected: |
| void GeneratorPrototypeResume(Node* receiver, Node* value, Node* context, |
| JSGeneratorObject::ResumeMode resume_mode, |
| char const* const method_name); |
| }; |
| |
| void GeneratorBuiltinsAssembler::GeneratorPrototypeResume( |
| Node* receiver, Node* value, Node* context, |
| JSGeneratorObject::ResumeMode resume_mode, char const* const method_name) { |
| Node* closed = SmiConstant(JSGeneratorObject::kGeneratorClosed); |
| |
| // Check if the {receiver} is actually a JSGeneratorObject. |
| Label if_receiverisincompatible(this, Label::kDeferred); |
| GotoIf(TaggedIsSmi(receiver), &if_receiverisincompatible); |
| Node* receiver_instance_type = LoadInstanceType(receiver); |
| GotoIfNot(Word32Equal(receiver_instance_type, |
| Int32Constant(JS_GENERATOR_OBJECT_TYPE)), |
| &if_receiverisincompatible); |
| |
| // Check if the {receiver} is running or already closed. |
| Node* receiver_continuation = |
| LoadObjectField(receiver, JSGeneratorObject::kContinuationOffset); |
| Label if_receiverisclosed(this, Label::kDeferred), |
| if_receiverisrunning(this, Label::kDeferred); |
| GotoIf(SmiEqual(receiver_continuation, closed), &if_receiverisclosed); |
| DCHECK_LT(JSGeneratorObject::kGeneratorExecuting, |
| JSGeneratorObject::kGeneratorClosed); |
| GotoIf(SmiLessThan(receiver_continuation, closed), &if_receiverisrunning); |
| |
| // Resume the {receiver} using our trampoline. |
| Node* result = |
| CallStub(CodeFactory::ResumeGenerator(isolate()), context, value, |
| receiver, SmiConstant(resume_mode), |
| SmiConstant(static_cast<int>(SuspendFlags::kGeneratorYield))); |
| Return(result); |
| |
| Bind(&if_receiverisincompatible); |
| { |
| // The {receiver} is not a valid JSGeneratorObject. |
| CallRuntime(Runtime::kThrowIncompatibleMethodReceiver, context, |
| HeapConstant( |
| factory()->NewStringFromAsciiChecked(method_name, TENURED)), |
| receiver); |
| Unreachable(); |
| } |
| |
| Bind(&if_receiverisclosed); |
| { |
| Callable create_iter_result_object = |
| CodeFactory::CreateIterResultObject(isolate()); |
| |
| // The {receiver} is closed already. |
| Node* result = nullptr; |
| switch (resume_mode) { |
| case JSGeneratorObject::kNext: |
| result = CallStub(create_iter_result_object, context, |
| UndefinedConstant(), TrueConstant()); |
| break; |
| case JSGeneratorObject::kReturn: |
| result = |
| CallStub(create_iter_result_object, context, value, TrueConstant()); |
| break; |
| case JSGeneratorObject::kThrow: |
| result = CallRuntime(Runtime::kThrow, context, value); |
| break; |
| } |
| Return(result); |
| } |
| |
| Bind(&if_receiverisrunning); |
| { |
| CallRuntime(Runtime::kThrowGeneratorRunning, context); |
| Unreachable(); |
| } |
| } |
| |
| // ES6 #sec-generator.prototype.next |
| TF_BUILTIN(GeneratorPrototypeNext, GeneratorBuiltinsAssembler) { |
| Node* receiver = Parameter(Descriptor::kReceiver); |
| Node* value = Parameter(Descriptor::kValue); |
| Node* context = Parameter(Descriptor::kContext); |
| GeneratorPrototypeResume(receiver, value, context, JSGeneratorObject::kNext, |
| "[Generator].prototype.next"); |
| } |
| |
| // ES6 #sec-generator.prototype.return |
| TF_BUILTIN(GeneratorPrototypeReturn, GeneratorBuiltinsAssembler) { |
| Node* receiver = Parameter(Descriptor::kReceiver); |
| Node* value = Parameter(Descriptor::kValue); |
| Node* context = Parameter(Descriptor::kContext); |
| GeneratorPrototypeResume(receiver, value, context, JSGeneratorObject::kReturn, |
| "[Generator].prototype.return"); |
| } |
| |
| // ES6 #sec-generator.prototype.throw |
| TF_BUILTIN(GeneratorPrototypeThrow, GeneratorBuiltinsAssembler) { |
| Node* receiver = Parameter(Descriptor::kReceiver); |
| Node* exception = Parameter(Descriptor::kException); |
| Node* context = Parameter(Descriptor::kContext); |
| GeneratorPrototypeResume(receiver, exception, context, |
| JSGeneratorObject::kThrow, |
| "[Generator].prototype.throw"); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |