| // Copyright 2014 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/runtime/runtime-utils.h" |
| |
| #include "src/arguments.h" |
| #include "src/factory.h" |
| #include "src/frames-inl.h" |
| #include "src/objects-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| RUNTIME_FUNCTION(Runtime_CreateJSGeneratorObject) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 2); |
| CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0); |
| CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1); |
| RUNTIME_ASSERT(function->shared()->is_resumable()); |
| |
| Handle<FixedArray> operand_stack; |
| if (FLAG_ignition && FLAG_ignition_generators) { |
| int size = function->shared()->bytecode_array()->register_count(); |
| operand_stack = isolate->factory()->NewFixedArray(size); |
| } else { |
| DCHECK(!function->shared()->HasBytecodeArray()); |
| operand_stack = handle(isolate->heap()->empty_fixed_array()); |
| } |
| |
| Handle<JSGeneratorObject> generator = |
| isolate->factory()->NewJSGeneratorObject(function); |
| generator->set_function(*function); |
| generator->set_context(isolate->context()); |
| generator->set_receiver(*receiver); |
| generator->set_operand_stack(*operand_stack); |
| generator->set_continuation(JSGeneratorObject::kGeneratorExecuting); |
| return *generator; |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_SuspendJSGeneratorObject) { |
| HandleScope handle_scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator_object, 0); |
| |
| JavaScriptFrameIterator stack_iterator(isolate); |
| JavaScriptFrame* frame = stack_iterator.frame(); |
| RUNTIME_ASSERT(frame->function()->shared()->is_resumable()); |
| DCHECK_EQ(frame->function(), generator_object->function()); |
| DCHECK(frame->function()->shared()->is_compiled()); |
| DCHECK(!frame->function()->IsOptimized()); |
| |
| // The caller should have saved the context and continuation already. |
| DCHECK_EQ(generator_object->context(), Context::cast(frame->context())); |
| DCHECK_LT(0, generator_object->continuation()); |
| |
| // We expect there to be at least two values on the operand stack: the return |
| // value of the yield expression, and the arguments to this runtime call. |
| // Neither of those should be saved. |
| int operands_count = frame->ComputeOperandsCount(); |
| DCHECK_GE(operands_count, 1 + args.length()); |
| operands_count -= 1 + args.length(); |
| |
| if (operands_count == 0) { |
| // Although it's semantically harmless to call this function with an |
| // operands_count of zero, it is also unnecessary. |
| DCHECK_EQ(generator_object->operand_stack(), |
| isolate->heap()->empty_fixed_array()); |
| } else { |
| Handle<FixedArray> operand_stack = |
| isolate->factory()->NewFixedArray(operands_count); |
| frame->SaveOperandStack(*operand_stack); |
| generator_object->set_operand_stack(*operand_stack); |
| } |
| |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorClose) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| generator->set_continuation(JSGeneratorObject::kGeneratorClosed); |
| |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| // Returns function of generator activation. |
| RUNTIME_FUNCTION(Runtime_GeneratorGetFunction) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| return generator->function(); |
| } |
| |
| |
| // Returns receiver of generator activation. |
| RUNTIME_FUNCTION(Runtime_GeneratorGetReceiver) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| return generator->receiver(); |
| } |
| |
| |
| // Returns input of generator activation. |
| RUNTIME_FUNCTION(Runtime_GeneratorGetInput) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| return generator->input(); |
| } |
| |
| |
| // Returns resume mode of generator activation. |
| RUNTIME_FUNCTION(Runtime_GeneratorGetResumeMode) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| return Smi::FromInt(generator->resume_mode()); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorSetContext) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| generator->set_context(isolate->context()); |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorGetContinuation) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| return Smi::FromInt(generator->continuation()); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorSetContinuation) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 2); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| CONVERT_SMI_ARG_CHECKED(continuation, 1); |
| |
| generator->set_continuation(continuation); |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorLoadRegister) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 2); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| CONVERT_SMI_ARG_CHECKED(index, 1); |
| |
| DCHECK(FLAG_ignition && FLAG_ignition_generators); |
| DCHECK(generator->function()->shared()->HasBytecodeArray()); |
| |
| return generator->operand_stack()->get(index); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorStoreRegister) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 3); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| CONVERT_SMI_ARG_CHECKED(index, 1); |
| CONVERT_ARG_HANDLE_CHECKED(Object, value, 2); |
| |
| DCHECK(FLAG_ignition && FLAG_ignition_generators); |
| DCHECK(generator->function()->shared()->HasBytecodeArray()); |
| |
| generator->operand_stack()->set(index, *value); |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_GeneratorGetSourcePosition) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0); |
| |
| if (generator->is_suspended()) { |
| Handle<Code> code(generator->function()->code(), isolate); |
| int offset = generator->continuation(); |
| RUNTIME_ASSERT(0 <= offset && offset < code->instruction_size()); |
| return Smi::FromInt(code->SourcePosition(offset)); |
| } |
| |
| return isolate->heap()->undefined_value(); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |