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/*
* Copyright (C) 2019-2021 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.
*/
#include "config.h"
#include "JSAsyncGenerator.h"
#include "JSCInlines.h"
#include "JSInternalFieldObjectImplInlines.h"
#include "JSPromise.h"
#include "JSPromiseReaction.h"
#include "ObjectConstructor.h"
namespace JSC {
const ClassInfo JSAsyncGenerator::s_info = { "AsyncGenerator"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSAsyncGenerator) };
JSAsyncGenerator* JSAsyncGenerator::create(VM& vm, Structure* structure)
{
JSAsyncGenerator* generator = new (NotNull, allocateCell<JSAsyncGenerator>(vm)) JSAsyncGenerator(vm, structure);
generator->finishCreation(vm);
return generator;
}
Structure* JSAsyncGenerator::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
return Structure::create(vm, globalObject, prototype, TypeInfo(JSAsyncGeneratorType, StructureFlags), info());
}
JSAsyncGenerator::JSAsyncGenerator(VM& vm, Structure* structure)
: Base(vm, structure)
{
}
void JSAsyncGenerator::finishCreation(VM& vm)
{
Base::finishCreation(vm);
auto values = initialValues();
ASSERT(values.size() == numberOfInternalFields);
for (unsigned index = 0; index < values.size(); ++index)
internalField(index).set(vm, this, values[index]);
}
template<typename Visitor>
void JSAsyncGenerator::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
auto* thisObject = jsCast<JSAsyncGenerator*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
}
DEFINE_VISIT_CHILDREN(JSAsyncGenerator);
void JSAsyncGenerator::enqueue(VM& vm, JSValue value, int32_t mode, JSPromise* promise)
{
if (isQueueEmpty()) {
setResumeValue(vm, value);
setResumeMode(mode);
setResumePromise(vm, promise);
} else {
JSValue last = queue();
if (last.isNull()) {
JSPromiseReaction* item = JSPromiseReaction::create(
vm,
promise,
value,
jsNumber(mode),
jsUndefined(), // Will be set to self (prev)
nullptr // Will be set to self (next)
);
item->setNext(vm, item);
item->setContext(vm, item);
setQueue(vm, item);
} else {
JSPromiseReaction* tail = jsCast<JSPromiseReaction*>(last);
JSPromiseReaction* head = tail->next();
JSPromiseReaction* item = JSPromiseReaction::create(
vm,
promise,
value,
jsNumber(mode),
tail, // prev = old tail
head // next = head (to maintain circular)
);
tail->setNext(vm, item);
head->setContext(vm, item);
setQueue(vm, item);
}
}
}
std::tuple<JSValue, int32_t, JSPromise*> JSAsyncGenerator::dequeue(VM& vm)
{
ASSERT(!isQueueEmpty());
JSValue value = resumeValue();
int32_t mode = resumeMode();
JSPromise* promise = jsCast<JSPromise*>(resumePromise());
JSValue last = queue();
if (last.isNull()) {
setResumeMode(static_cast<int32_t>(AsyncGeneratorResumeMode::Empty));
setResumeValue(vm, jsUndefined());
setResumePromise(vm, jsUndefined());
} else {
JSPromiseReaction* tail = jsCast<JSPromiseReaction*>(last);
JSPromiseReaction* head = tail->next();
setResumePromise(vm, head->promise());
setResumeValue(vm, head->onFulfilled());
setResumeMode(head->onRejected().asInt32());
if (head == tail)
setQueue(vm, jsNull());
else {
JSPromiseReaction* newHead = head->next();
newHead->setContext(vm, tail); // newHead.prev = tail
tail->setNext(vm, newHead);
}
}
return { value, mode, promise };
}
} // namespace JSC
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