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/*
* Copyright (C) 2019-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "JSGenerator.h"
#include "JSInternalFieldObjectImpl.h"
#include <tuple>
namespace JSC {
class JSPromise;
class JSAsyncGenerator final : public JSInternalFieldObjectImpl<8> {
public:
using Base = JSInternalFieldObjectImpl<8>;
template<typename CellType, SubspaceAccess mode>
static GCClient::IsoSubspace* subspaceFor(VM& vm)
{
return vm.asyncGeneratorSpace<mode>();
}
enum class AsyncGeneratorState : int32_t {
Completed = -1,
Executing = -2,
Init = 0,
AwaitingReturn = -3,
};
static_assert(static_cast<int32_t>(AsyncGeneratorState::Completed) == static_cast<int32_t>(JSGenerator::State::Completed));
static_assert(static_cast<int32_t>(AsyncGeneratorState::Executing) == static_cast<int32_t>(JSGenerator::State::Executing));
static_assert(static_cast<int32_t>(AsyncGeneratorState::Init) == static_cast<int32_t>(JSGenerator::State::Init));
enum class AsyncGeneratorSuspendReason : int32_t {
Await = 0,
Yield = 1,
};
static constexpr int32_t reasonMask = 0x1;
static constexpr int32_t reasonShift = 1;
enum class AsyncGeneratorResumeMode : int32_t {
Empty = -1,
Normal = 0,
Return = 1,
Throw = 2
};
static_assert(static_cast<int32_t>(AsyncGeneratorResumeMode::Normal) == static_cast<int32_t>(JSGenerator::ResumeMode::NormalMode));
static_assert(static_cast<int32_t>(AsyncGeneratorResumeMode::Return) == static_cast<int32_t>(JSGenerator::ResumeMode::ReturnMode));
static_assert(static_cast<int32_t>(AsyncGeneratorResumeMode::Throw) == static_cast<int32_t>(JSGenerator::ResumeMode::ThrowMode));
enum class Field : uint32_t {
State = 0,
Next,
This,
Frame,
Queue,
ResumeValue,
ResumeMode,
ResumePromise,
};
static_assert(numberOfInternalFields == 8);
static std::array<JSValue, numberOfInternalFields> initialValues()
{
return { {
jsNumber(static_cast<int32_t>(AsyncGeneratorState::Init)),
jsUndefined(),
jsUndefined(),
jsUndefined(),
jsNull(),
jsUndefined(),
jsNumber(static_cast<int32_t>(AsyncGeneratorResumeMode::Empty)),
jsUndefined(),
} };
}
static JSAsyncGenerator* create(VM&, Structure*);
static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
int32_t state() const
{
return Base::internalField(static_cast<unsigned>(Field::State)).get().asInt32AsAnyInt();
}
void setState(int32_t state)
{
Base::internalField(static_cast<unsigned>(Field::State)).setWithoutWriteBarrier(jsNumber(state));
}
JSValue next() const
{
return Base::internalField(static_cast<unsigned>(Field::Next)).get();
}
JSValue thisValue() const
{
return Base::internalField(static_cast<unsigned>(Field::This)).get();
}
JSValue frame() const
{
return Base::internalField(static_cast<unsigned>(Field::Frame)).get();
}
JSValue queue() const
{
return Base::internalField(static_cast<unsigned>(Field::Queue)).get();
}
void setQueue(VM& vm, JSValue value)
{
Base::internalField(static_cast<unsigned>(Field::Queue)).set(vm, this, value);
}
JSValue resumeValue() const
{
return Base::internalField(static_cast<unsigned>(Field::ResumeValue)).get();
}
void setResumeValue(VM& vm, JSValue value)
{
Base::internalField(static_cast<unsigned>(Field::ResumeValue)).set(vm, this, value);
}
int32_t resumeMode() const
{
return Base::internalField(static_cast<unsigned>(Field::ResumeMode)).get().asInt32AsAnyInt();
}
void setResumeMode(int32_t mode)
{
Base::internalField(static_cast<unsigned>(Field::ResumeMode)).setWithoutWriteBarrier(jsNumber(mode));
}
JSValue resumePromise() const
{
return Base::internalField(static_cast<unsigned>(Field::ResumePromise)).get();
}
void setResumePromise(VM& vm, JSValue value)
{
Base::internalField(static_cast<unsigned>(Field::ResumePromise)).set(vm, this, value);
}
bool isQueueEmpty() const
{
return resumeMode() == static_cast<int32_t>(AsyncGeneratorResumeMode::Empty);
}
bool isExecutionState() const
{
int32_t state = this->state();
if (state == static_cast<int32_t>(AsyncGeneratorState::Executing))
return true;
if (state > 0 && (state & reasonMask) == static_cast<int32_t>(AsyncGeneratorSuspendReason::Await))
return true;
return false;
}
void enqueue(VM&, JSValue value, int32_t resumeMode, JSPromise*);
std::tuple<JSValue, int32_t, JSPromise*> dequeue(VM&);
DECLARE_EXPORT_INFO;
DECLARE_VISIT_CHILDREN;
private:
JSAsyncGenerator(VM&, Structure*);
void finishCreation(VM&);
};
} // namespace JSC
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