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// 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/debug/debug.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);
CHECK(IsResumableFunction(function->shared()->kind()));
Handle<FixedArray> operand_stack;
if (function->shared()->HasBytecodeArray()) {
// New-style generators.
DCHECK(!function->shared()->HasBaselineCode());
int size = function->shared()->bytecode_array()->register_count();
operand_stack = isolate->factory()->NewFixedArray(size);
} else {
// Old-style generators.
DCHECK(function->shared()->HasBaselineCode());
operand_stack = isolate->factory()->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();
CHECK(IsResumableFunction(frame->function()->shared()->kind()));
DCHECK_EQ(frame->function(), generator_object->function());
DCHECK(frame->function()->shared()->is_compiled());
DCHECK(!frame->function()->IsOptimized());
isolate->debug()->RecordAsyncFunction(generator_object);
// 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();
}
RUNTIME_FUNCTION(Runtime_GeneratorGetFunction) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
return generator->function();
}
RUNTIME_FUNCTION(Runtime_GeneratorGetReceiver) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
return generator->receiver();
}
RUNTIME_FUNCTION(Runtime_GeneratorGetInputOrDebugPos) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
return generator->input_or_debug_pos();
}
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_GeneratorGetContinuation) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
return Smi::FromInt(generator->continuation());
}
RUNTIME_FUNCTION(Runtime_GeneratorGetSourcePosition) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
if (!generator->is_suspended()) return isolate->heap()->undefined_value();
return Smi::FromInt(generator->source_position());
}
} // namespace internal
} // namespace v8
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