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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef vm_AsyncIteration_h
#define vm_AsyncIteration_h
#include "jscntxt.h"
#include "jsobj.h"
#include "builtin/Promise.h"
#include "vm/GeneratorObject.h"
namespace js {
// Async generator consists of 2 functions, |wrapped| and |unwrapped|.
// |unwrapped| is a generator function compiled from async generator script,
// |await| behaves just like |yield| there. |unwrapped| isn't exposed to user
// script.
// |wrapped| is a native function that is the value of async generator.
JSObject*
WrapAsyncGeneratorWithProto(JSContext* cx, HandleFunction unwrapped, HandleObject proto);
JSObject*
WrapAsyncGenerator(JSContext* cx, HandleFunction unwrapped);
bool
IsWrappedAsyncGenerator(JSFunction* fun);
JSFunction*
GetWrappedAsyncGenerator(JSFunction* unwrapped);
JSFunction*
GetUnwrappedAsyncGenerator(JSFunction* wrapped);
MOZ_MUST_USE bool
AsyncGeneratorAwaitedFulfilled(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
HandleValue value);
MOZ_MUST_USE bool
AsyncGeneratorAwaitedRejected(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
HandleValue reason);
class AsyncGeneratorRequest : public NativeObject
{
private:
enum AsyncGeneratorRequestSlots {
Slot_CompletionKind = 0,
Slot_CompletionValue,
Slot_Promise,
Slots,
};
void setCompletionKind(CompletionKind completionKind_) {
setFixedSlot(Slot_CompletionKind,
Int32Value(static_cast<int32_t>(completionKind_)));
}
void setCompletionValue(HandleValue completionValue_) {
setFixedSlot(Slot_CompletionValue, completionValue_);
}
void setPromise(HandleObject promise_) {
setFixedSlot(Slot_Promise, ObjectValue(*promise_));
}
public:
static const Class class_;
static AsyncGeneratorRequest*
create(JSContext* cx, CompletionKind completionKind, HandleValue completionValue,
HandleObject promise);
CompletionKind completionKind() const {
return static_cast<CompletionKind>(getFixedSlot(Slot_CompletionKind).toInt32());
}
JS::Value completionValue() const {
return getFixedSlot(Slot_CompletionValue);
}
JSObject* promise() const {
return &getFixedSlot(Slot_Promise).toObject();
}
};
class AsyncGeneratorObject : public NativeObject
{
private:
enum AsyncGeneratorObjectSlots {
Slot_State = 0,
Slot_Generator,
Slot_QueueOrRequest,
Slots
};
enum State {
State_SuspendedStart,
State_SuspendedYield,
State_Executing,
State_Completed
};
State state() const {
return static_cast<State>(getFixedSlot(Slot_State).toInt32());
}
void setState(State state_) {
setFixedSlot(Slot_State, Int32Value(state_));
}
void setGenerator(const Value& value) {
setFixedSlot(Slot_Generator, value);
}
// Queue is implemented in 2 ways. If only one request is queued ever,
// request is stored directly to the slot. Once 2 requests are queued, an
// array is created and requests are pushed into it, and the array is
// stored to the slot.
bool isSingleQueue() const {
return getFixedSlot(Slot_QueueOrRequest).isNull() ||
getFixedSlot(Slot_QueueOrRequest).toObject().is<AsyncGeneratorRequest>();
}
bool isSingleQueueEmpty() const {
return getFixedSlot(Slot_QueueOrRequest).isNull();
}
void setSingleQueueRequest(AsyncGeneratorRequest* request) {
setFixedSlot(Slot_QueueOrRequest, ObjectValue(*request));
}
void clearSingleQueueRequest() {
setFixedSlot(Slot_QueueOrRequest, NullHandleValue);
}
AsyncGeneratorRequest* singleQueueRequest() const {
return &getFixedSlot(Slot_QueueOrRequest).toObject().as<AsyncGeneratorRequest>();
}
ArrayObject* queue() const {
return &getFixedSlot(Slot_QueueOrRequest).toObject().as<ArrayObject>();
}
void setQueue(JSObject* queue_) {
setFixedSlot(Slot_QueueOrRequest, ObjectValue(*queue_));
}
public:
static const Class class_;
static AsyncGeneratorObject*
create(JSContext* cx, HandleFunction asyncGen, HandleValue generatorVal);
bool isSuspendedStart() const {
return state() == State_SuspendedStart;
}
bool isSuspendedYield() const {
return state() == State_SuspendedYield;
}
bool isExecuting() const {
return state() == State_Executing;
}
bool isCompleted() const {
return state() == State_Completed;
}
void setSuspendedStart() {
setState(State_SuspendedStart);
}
void setSuspendedYield() {
setState(State_SuspendedYield);
}
void setExecuting() {
setState(State_Executing);
}
void setCompleted() {
setState(State_Completed);
}
JS::Value generatorVal() const {
return getFixedSlot(Slot_Generator);
}
GeneratorObject* generatorObj() const {
return &getFixedSlot(Slot_Generator).toObject().as<GeneratorObject>();
}
static MOZ_MUST_USE bool
enqueueRequest(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj,
Handle<AsyncGeneratorRequest*> request);
static AsyncGeneratorRequest*
dequeueRequest(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj);
static AsyncGeneratorRequest*
peekRequest(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj);
bool isQueueEmpty() const {
if (isSingleQueue())
return isSingleQueueEmpty();
return queue()->length() == 0;
}
};
MOZ_MUST_USE bool
AsyncGeneratorResumeNext(JSContext* cx, Handle<AsyncGeneratorObject*> asyncGenObj);
} // namespace js
#endif /* vm_AsyncIteration_h */
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