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// Copyright 2018 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.
#ifndef V8_OBJECTS_JS_GENERATOR_H_
#define V8_OBJECTS_JS_GENERATOR_H_
#include "src/objects/js-objects.h"
// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"
namespace v8 {
namespace internal {
class JSGeneratorObject : public JSObject {
public:
// [function]: The function corresponding to this generator object.
DECL_ACCESSORS(function, JSFunction)
// [context]: The context of the suspended computation.
DECL_ACCESSORS(context, Context)
// [receiver]: The receiver of the suspended computation.
DECL_ACCESSORS(receiver, Object)
// [input_or_debug_pos]
// For executing generators: the most recent input value.
// For suspended generators: debug information (bytecode offset).
// There is currently no need to remember the most recent input value for a
// suspended generator.
DECL_ACCESSORS(input_or_debug_pos, Object)
// [resume_mode]: The most recent resume mode.
enum ResumeMode { kNext, kReturn, kThrow };
DECL_INT_ACCESSORS(resume_mode)
// [continuation]
//
// A positive value indicates a suspended generator. The special
// kGeneratorExecuting and kGeneratorClosed values indicate that a generator
// cannot be resumed.
inline int continuation() const;
inline void set_continuation(int continuation);
inline bool is_closed() const;
inline bool is_executing() const;
inline bool is_suspended() const;
// For suspended generators: the source position at which the generator
// is suspended.
int source_position() const;
// [parameters_and_registers]: Saved interpreter register file.
DECL_ACCESSORS(parameters_and_registers, FixedArray)
DECL_CAST(JSGeneratorObject)
// Dispatched behavior.
DECL_PRINTER(JSGeneratorObject)
DECL_VERIFIER(JSGeneratorObject)
// Magic sentinel values for the continuation.
static const int kGeneratorExecuting = -2;
static const int kGeneratorClosed = -1;
// Layout description.
static const int kFunctionOffset = JSObject::kHeaderSize;
static const int kContextOffset = kFunctionOffset + kPointerSize;
static const int kReceiverOffset = kContextOffset + kPointerSize;
static const int kInputOrDebugPosOffset = kReceiverOffset + kPointerSize;
static const int kResumeModeOffset = kInputOrDebugPosOffset + kPointerSize;
static const int kContinuationOffset = kResumeModeOffset + kPointerSize;
static const int kParametersAndRegistersOffset =
kContinuationOffset + kPointerSize;
static const int kSize = kParametersAndRegistersOffset + kPointerSize;
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject);
};
class JSAsyncGeneratorObject : public JSGeneratorObject {
public:
DECL_CAST(JSAsyncGeneratorObject)
// Dispatched behavior.
DECL_VERIFIER(JSAsyncGeneratorObject)
// [queue]
// Pointer to the head of a singly linked list of AsyncGeneratorRequest, or
// undefined.
DECL_ACCESSORS(queue, HeapObject)
// [is_awaiting]
// Whether or not the generator is currently awaiting.
DECL_INT_ACCESSORS(is_awaiting)
// Layout description.
static const int kQueueOffset = JSGeneratorObject::kSize;
static const int kIsAwaitingOffset = kQueueOffset + kPointerSize;
static const int kSize = kIsAwaitingOffset + kPointerSize;
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(JSAsyncGeneratorObject);
};
} // namespace internal
} // namespace v8
#include "src/objects/object-macros-undef.h"
#endif // V8_OBJECTS_JS_GENERATOR_H_
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