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/*
* Copyright (C) 2019 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"
namespace JSC {
class JSAsyncGenerator final : public JSInternalFieldObjectImpl<8> {
public:
using Base = JSInternalFieldObjectImpl<8>;
// JSAsyncGenerator has one inline storage slot, which is pointing internalField(0).
static size_t allocationSize(Checked<size_t> inlineCapacity)
{
ASSERT_UNUSED(inlineCapacity, inlineCapacity == 0U);
return sizeof(JSAsyncGenerator);
}
template<typename CellType, SubspaceAccess mode>
static IsoSubspace* subspaceFor(VM& vm)
{
return vm.asyncGeneratorSpace<mode>();
}
enum class AsyncGeneratorState : int32_t {
Completed = -1,
Executing = -2,
SuspendedStart = -3,
SuspendedYield = -4,
AwaitingReturn = -5,
};
static_assert(static_cast<int32_t>(AsyncGeneratorState::Completed) == static_cast<int32_t>(JSGenerator::GeneratorState::Completed));
static_assert(static_cast<int32_t>(AsyncGeneratorState::Executing) == static_cast<int32_t>(JSGenerator::GeneratorState::Executing));
enum class AsyncGeneratorSuspendReason : int32_t {
None = 0,
Yield = -1,
Await = -2
};
enum class Field : uint32_t {
// FIXME: JSAsyncGenerator should support PolyProto, since generator tends to be created with poly proto mode.
// We reserve the first internal field for PolyProto property. This offset is identical to JSFinalObject's first inline storage slot which will be used for PolyProto.
PolyProto = 0,
State,
Next,
This,
Frame,
SuspendReason,
QueueFirst,
QueueLast,
};
static_assert(numberOfInternalFields == 8);
static std::array<JSValue, numberOfInternalFields> initialValues()
{
return { {
jsNull(),
jsNumber(static_cast<int32_t>(AsyncGeneratorState::SuspendedStart)),
jsUndefined(),
jsUndefined(),
jsUndefined(),
jsNumber(static_cast<int32_t>(AsyncGeneratorSuspendReason::None)),
jsNull(),
jsNull(),
} };
}
static JSAsyncGenerator* create(VM&, Structure*);
static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
DECLARE_EXPORT_INFO;
static void visitChildren(JSCell*, SlotVisitor&);
protected:
JSAsyncGenerator(VM&, Structure*);
void finishCreation(VM&);
};
} // namespace JSC