mirror of
https://github.com/mozilla/gecko-dev.git
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539 lines
18 KiB
C++
539 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_Promise_h
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#define mozilla_dom_Promise_h
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#include "mozilla/Attributes.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/TimeStamp.h"
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#include "mozilla/TypeTraits.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "nsCycleCollectionParticipant.h"
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#include "mozilla/dom/PromiseBinding.h"
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#include "mozilla/dom/ToJSValue.h"
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#include "mozilla/WeakPtr.h"
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#include "nsWrapperCache.h"
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#include "nsAutoPtr.h"
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#include "js/TypeDecls.h"
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#include "jspubtd.h"
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// Bug 1083361 introduces a new mechanism for tracking uncaught
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// rejections. This #define serves to track down the parts of code
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// that need to be removed once clients have been put together
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// to take advantage of the new mechanism. New code should not
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// depend on code #ifdefed to this #define.
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#define DOM_PROMISE_DEPRECATED_REPORTING !SPIDERMONKEY_PROMISE
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#if defined(DOM_PROMISE_DEPRECATED_REPORTING)
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#include "mozilla/dom/workers/bindings/WorkerHolder.h"
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#endif // defined(DOM_PROMISE_DEPRECATED_REPORTING)
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class nsIGlobalObject;
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namespace mozilla {
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namespace dom {
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class AnyCallback;
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class DOMError;
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class MediaStreamError;
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class PromiseCallback;
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class PromiseInit;
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class PromiseNativeHandler;
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class PromiseDebugging;
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class Promise;
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#if defined(DOM_PROMISE_DEPRECATED_REPORTING)
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class PromiseReportRejectWorkerHolder : public workers::WorkerHolder
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{
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// PromiseReportRejectWorkerHolder is held by an nsAutoPtr on the Promise
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// which means that this object will be destroyed before the Promise is
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// destroyed.
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Promise* MOZ_NON_OWNING_REF mPromise;
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public:
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explicit PromiseReportRejectWorkerHolder(Promise* aPromise)
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: mPromise(aPromise)
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{
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MOZ_ASSERT(mPromise);
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}
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virtual bool
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Notify(workers::Status aStatus) override;
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};
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#endif // defined(DOM_PROMISE_DEPRECATED_REPORTING)
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#define NS_PROMISE_IID \
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{ 0x1b8d6215, 0x3e67, 0x43ba, \
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{ 0x8a, 0xf9, 0x31, 0x5e, 0x8f, 0xce, 0x75, 0x65 } }
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class Promise : public nsISupports,
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#ifndef SPIDERMONKEY_PROMISE
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// Only wrappercached when we're not using SpiderMonkey
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// promises, because those don't have a useful object moved
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// hook, which wrappercache needs.
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public nsWrapperCache,
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#endif // SPIDERMONKEY_PROMISE
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public SupportsWeakPtr<Promise>
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{
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friend class NativePromiseCallback;
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friend class PromiseReactionJob;
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friend class PromiseResolverTask;
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friend class PromiseTask;
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#if defined(DOM_PROMISE_DEPRECATED_REPORTING)
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friend class PromiseReportRejectWorkerHolder;
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#endif // defined(DOM_PROMISE_DEPRECATED_REPORTING)
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friend class PromiseWorkerProxy;
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friend class PromiseWorkerProxyRunnable;
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friend class RejectPromiseCallback;
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friend class ResolvePromiseCallback;
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friend class PromiseResolveThenableJob;
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friend class FastPromiseResolveThenableJob;
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friend class WrapperPromiseCallback;
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_PROMISE_IID)
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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#ifdef SPIDERMONKEY_PROMISE
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// We're not skippable, since we're not owned from JS to start with.
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(Promise)
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#else // SPIDERMONKEY_PROMISE
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NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS(Promise)
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#endif // SPIDERMONKEY_PROMISE
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MOZ_DECLARE_WEAKREFERENCE_TYPENAME(Promise)
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// Promise creation tries to create a JS reflector for the Promise, so is
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// fallible. Furthermore, we don't want to do JS-wrapping on a 0-refcount
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// object, so we addref before doing that and return the addrefed pointer
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// here.
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#ifdef SPIDERMONKEY_PROMISE
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static already_AddRefed<Promise>
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Create(nsIGlobalObject* aGlobal, ErrorResult& aRv);
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// Reports a rejected Promise by sending an error report.
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static void ReportRejectedPromise(JSContext* aCx, JS::HandleObject aPromise);
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#else
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static already_AddRefed<Promise>
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Create(nsIGlobalObject* aGlobal, ErrorResult& aRv,
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// Passing null for aDesiredProto will use Promise.prototype.
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JS::Handle<JSObject*> aDesiredProto = nullptr);
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#endif // SPIDERMONKEY_PROMISE
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typedef void (Promise::*MaybeFunc)(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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void MaybeResolve(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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void MaybeReject(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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// Helpers for using Promise from C++.
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// Most DOM objects are handled already. To add a new type T, add a
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// ToJSValue overload in ToJSValue.h.
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// aArg is a const reference so we can pass rvalues like integer constants
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template <typename T>
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void MaybeResolve(const T& aArg) {
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MaybeSomething(aArg, &Promise::MaybeResolve);
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}
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inline void MaybeReject(nsresult aArg) {
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MOZ_ASSERT(NS_FAILED(aArg));
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MaybeSomething(aArg, &Promise::MaybeReject);
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}
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inline void MaybeReject(ErrorResult& aArg) {
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MOZ_ASSERT(aArg.Failed());
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MaybeSomething(aArg, &Promise::MaybeReject);
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}
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void MaybeReject(const RefPtr<MediaStreamError>& aArg);
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void MaybeRejectWithNull();
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void MaybeRejectWithUndefined();
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// DO NOT USE MaybeRejectBrokenly with in new code. Promises should be
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// rejected with Error instances.
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// Note: MaybeRejectBrokenly is a template so we can use it with DOMError
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// without instantiating the DOMError specialization of MaybeSomething in
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// every translation unit that includes this header, because that would
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// require use to include DOMError.h either here or in all those translation
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// units.
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template<typename T>
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void MaybeRejectBrokenly(const T& aArg); // Not implemented by default; see
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// specializations in the .cpp for
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// the T values we support.
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// Called by DOM to let us execute our callbacks. May be called recursively.
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// Returns true if at least one microtask was processed.
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static bool PerformMicroTaskCheckpoint();
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static void PerformWorkerMicroTaskCheckpoint();
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static void PerformWorkerDebuggerMicroTaskCheckpoint();
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// WebIDL
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nsIGlobalObject* GetParentObject() const
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{
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return mGlobal;
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}
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#ifdef SPIDERMONKEY_PROMISE
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bool
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WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
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JS::MutableHandle<JSObject*> aWrapper);
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// Do the equivalent of Promise.resolve in the current compartment of aCx.
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// Errorrs are reported on the ErrorResult; if aRv comes back !Failed(), this
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// function MUST return a non-null value.
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static already_AddRefed<Promise>
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Resolve(nsIGlobalObject* aGlobal, JSContext* aCx,
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JS::Handle<JS::Value> aValue, ErrorResult& aRv);
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// Do the equivalent of Promise.reject in the current compartment of aCx.
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// Errorrs are reported on the ErrorResult; if aRv comes back !Failed(), this
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// function MUST return a non-null value.
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static already_AddRefed<Promise>
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Reject(nsIGlobalObject* aGlobal, JSContext* aCx,
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JS::Handle<JS::Value> aValue, ErrorResult& aRv);
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static already_AddRefed<Promise>
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All(const GlobalObject& aGlobal,
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const nsTArray<RefPtr<Promise>>& aPromiseList, ErrorResult& aRv);
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void
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Then(JSContext* aCx,
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// aCalleeGlobal may not be in the compartment of aCx, when called over
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// Xrays.
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JS::Handle<JSObject*> aCalleeGlobal,
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AnyCallback* aResolveCallback, AnyCallback* aRejectCallback,
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JS::MutableHandle<JS::Value> aRetval,
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ErrorResult& aRv);
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JSObject* PromiseObj() const
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{
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if (mPromiseObj) {
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JS::ExposeObjectToActiveJS(mPromiseObj);
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}
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return mPromiseObj;
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}
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#else // SPIDERMONKEY_PROMISE
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JSObject* PromiseObj()
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{
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return GetWrapper();
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}
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virtual JSObject*
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WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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static already_AddRefed<Promise>
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Constructor(const GlobalObject& aGlobal, PromiseInit& aInit,
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ErrorResult& aRv, JS::Handle<JSObject*> aDesiredProto);
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static void
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Resolve(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
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JS::Handle<JS::Value> aValue,
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JS::MutableHandle<JS::Value> aRetval, ErrorResult& aRv);
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static already_AddRefed<Promise>
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Resolve(nsIGlobalObject* aGlobal, JSContext* aCx,
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JS::Handle<JS::Value> aValue, ErrorResult& aRv);
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static void
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Reject(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
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JS::Handle<JS::Value> aValue,
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JS::MutableHandle<JS::Value> aRetval, ErrorResult& aRv);
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static already_AddRefed<Promise>
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Reject(nsIGlobalObject* aGlobal, JSContext* aCx,
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JS::Handle<JS::Value> aValue, ErrorResult& aRv);
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void
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Then(JSContext* aCx,
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// aCalleeGlobal may not be in the compartment of aCx, when called over
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// Xrays.
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JS::Handle<JSObject*> aCalleeGlobal,
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AnyCallback* aResolveCallback, AnyCallback* aRejectCallback,
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JS::MutableHandle<JS::Value> aRetval,
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ErrorResult& aRv);
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void
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Catch(JSContext* aCx,
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AnyCallback* aRejectCallback,
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JS::MutableHandle<JS::Value> aRetval,
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ErrorResult& aRv);
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static void
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All(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
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JS::Handle<JS::Value> aIterable, JS::MutableHandle<JS::Value> aRetval,
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ErrorResult& aRv);
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static already_AddRefed<Promise>
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All(const GlobalObject& aGlobal,
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const nsTArray<RefPtr<Promise>>& aPromiseList, ErrorResult& aRv);
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static void
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Race(const GlobalObject& aGlobal, JS::Handle<JS::Value> aThisv,
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JS::Handle<JS::Value> aIterable, JS::MutableHandle<JS::Value> aRetval,
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ErrorResult& aRv);
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static bool
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PromiseSpecies(JSContext* aCx, unsigned aArgc, JS::Value* aVp);
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#endif // SPIDERMONKEY_PROMISE
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void AppendNativeHandler(PromiseNativeHandler* aRunnable);
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JSObject* GlobalJSObject() const;
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JSCompartment* Compartment() const;
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#ifndef SPIDERMONKEY_PROMISE
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// Return a unique-to-the-process identifier for this Promise.
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uint64_t GetID();
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#endif // SPIDERMONKEY_PROMISE
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#ifndef SPIDERMONKEY_PROMISE
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enum JSCallbackSlots {
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SLOT_PROMISE = 0,
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SLOT_DATA
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};
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#endif // SPIDERMONKEY_PROMISE
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#ifdef SPIDERMONKEY_PROMISE
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// Create a dom::Promise from a given SpiderMonkey Promise object.
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// aPromiseObj MUST be in the compartment of aGlobal's global JS object.
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static already_AddRefed<Promise>
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CreateFromExisting(nsIGlobalObject* aGlobal,
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JS::Handle<JSObject*> aPromiseObj);
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#endif // SPIDERMONKEY_PROMISE
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protected:
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struct PromiseCapability;
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// Do NOT call this unless you're Promise::Create or
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// Promise::CreateFromExisting. I wish we could enforce that from inside this
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// class too, somehow.
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explicit Promise(nsIGlobalObject* aGlobal);
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virtual ~Promise();
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// Do JS-wrapping after Promise creation. Passing null for aDesiredProto will
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// use the default prototype for the sort of Promise we have.
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void CreateWrapper(JS::Handle<JSObject*> aDesiredProto, ErrorResult& aRv);
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#ifndef SPIDERMONKEY_PROMISE
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// Create the JS resolving functions of resolve() and reject(). And provide
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// references to the two functions by calling PromiseInit passed from Promise
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// constructor.
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void CallInitFunction(const GlobalObject& aGlobal, PromiseInit& aInit,
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ErrorResult& aRv);
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// The NewPromiseCapability function from
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// <http://www.ecma-international.org/ecma-262/6.0/#sec-newpromisecapability>.
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// Errors are communicated via aRv. If aForceCallbackCreation is
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// true, then this function will ensure that aCapability has a
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// useful mResolve/mReject even if mNativePromise is non-null.
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static void NewPromiseCapability(JSContext* aCx, nsIGlobalObject* aGlobal,
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JS::Handle<JS::Value> aConstructor,
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bool aForceCallbackCreation,
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PromiseCapability& aCapability,
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ErrorResult& aRv);
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bool IsPending()
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{
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return mResolvePending;
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}
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void GetDependentPromises(nsTArray<RefPtr<Promise>>& aPromises);
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bool IsLastInChain() const
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{
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return mIsLastInChain;
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}
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void SetNotifiedAsUncaught()
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{
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mWasNotifiedAsUncaught = true;
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}
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bool WasNotifiedAsUncaught() const
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{
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return mWasNotifiedAsUncaught;
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}
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#endif // SPIDERMONKEY_PROMISE
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private:
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enum PromiseState {
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Pending,
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Resolved,
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Rejected
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};
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#ifndef SPIDERMONKEY_PROMISE
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friend class PromiseDebugging;
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void SetState(PromiseState aState)
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{
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MOZ_ASSERT(mState == Pending);
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MOZ_ASSERT(aState != Pending);
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mState = aState;
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}
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void SetResult(JS::Handle<JS::Value> aValue)
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{
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mResult = aValue;
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}
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// This method enqueues promise's resolve/reject callbacks with promise's
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// result. It's executed when the resolver.resolve() or resolver.reject() is
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// called or when the promise already has a result and new callbacks are
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// appended by then() or catch().
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void TriggerPromiseReactions();
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void Settle(JS::Handle<JS::Value> aValue, Promise::PromiseState aState);
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void MaybeSettle(JS::Handle<JS::Value> aValue, Promise::PromiseState aState);
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void AppendCallbacks(PromiseCallback* aResolveCallback,
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PromiseCallback* aRejectCallback);
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#if defined(DOM_PROMISE_DEPRECATED_REPORTING)
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// If we have been rejected and our mResult is a JS exception,
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// report it to the error console.
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// Use MaybeReportRejectedOnce() for actual calls.
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void MaybeReportRejected();
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void MaybeReportRejectedOnce() {
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MaybeReportRejected();
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RemoveWorkerHolder();
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mResult.setUndefined();
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}
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#endif // defined(DOM_PROMISE_DEPRECATED_REPORTING)
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void MaybeResolveInternal(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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void MaybeRejectInternal(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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void ResolveInternal(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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void RejectInternal(JSContext* aCx,
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JS::Handle<JS::Value> aValue);
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#endif // SPIDERMONKEY_PROMISE
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template <typename T>
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void MaybeSomething(T& aArgument, MaybeFunc aFunc) {
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MOZ_ASSERT(PromiseObj()); // It was preserved!
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AutoEntryScript aes(mGlobal, "Promise resolution or rejection");
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JSContext* cx = aes.cx();
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JS::Rooted<JS::Value> val(cx);
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if (!ToJSValue(cx, aArgument, &val)) {
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HandleException(cx);
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return;
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}
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(this->*aFunc)(cx, val);
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}
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#ifndef SPIDERMONKEY_PROMISE
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// Static methods for the PromiseInit functions.
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static bool
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JSCallback(JSContext *aCx, unsigned aArgc, JS::Value *aVp);
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static bool
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ThenableResolverCommon(JSContext* aCx, uint32_t /* PromiseCallback::Task */ aTask,
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unsigned aArgc, JS::Value* aVp);
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static bool
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JSCallbackThenableResolver(JSContext *aCx, unsigned aArgc, JS::Value *aVp);
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static bool
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JSCallbackThenableRejecter(JSContext *aCx, unsigned aArgc, JS::Value *aVp);
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static JSObject*
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CreateFunction(JSContext* aCx, Promise* aPromise, int32_t aTask);
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static JSObject*
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CreateThenableFunction(JSContext* aCx, Promise* aPromise, uint32_t aTask);
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#if defined(DOM_PROMISE_DEPRECATED_REPORTING)
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void RemoveWorkerHolder();
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#endif // defined(DOM_PROMISE_DEPRECATED_REPORTING)
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// Capture the current stack and store it in aTarget. If false is
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// returned, an exception is presumably pending on aCx.
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bool CaptureStack(JSContext* aCx, JS::Heap<JSObject*>& aTarget);
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#endif // SPIDERMONKEY_PROMISE
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void HandleException(JSContext* aCx);
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RefPtr<nsIGlobalObject> mGlobal;
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#ifndef SPIDERMONKEY_PROMISE
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nsTArray<RefPtr<PromiseCallback> > mResolveCallbacks;
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nsTArray<RefPtr<PromiseCallback> > mRejectCallbacks;
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JS::Heap<JS::Value> mResult;
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// A stack that shows where this promise was allocated, if there was
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// JS running at the time. Otherwise null.
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JS::Heap<JSObject*> mAllocationStack;
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// mRejectionStack is only set when the promise is rejected directly from
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// script, by calling Promise.reject() or the rejection callback we pass to
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// the PromiseInit function. Promises that are rejected internally do not
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// have a rejection stack.
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JS::Heap<JSObject*> mRejectionStack;
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// mFullfillmentStack is only set when the promise is fulfilled directly from
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// script, by calling Promise.resolve() or the fulfillment callback we pass to
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// the PromiseInit function. Promises that are fulfilled internally do not
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// have a fulfillment stack.
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JS::Heap<JSObject*> mFullfillmentStack;
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PromiseState mState;
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#if defined(DOM_PROMISE_DEPRECATED_REPORTING)
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bool mHadRejectCallback;
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// If a rejected promise on a worker has no reject callbacks attached, it
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// needs to know when the worker is shutting down, to report the error on the
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// console before the worker's context is deleted. This feature is used for
|
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// that purpose.
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nsAutoPtr<PromiseReportRejectWorkerHolder> mWorkerHolder;
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#endif // defined(DOM_PROMISE_DEPRECATED_REPORTING)
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bool mTaskPending;
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bool mResolvePending;
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// `true` if this Promise is the last in the chain, or `false` if
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|
// another Promise has been created from this one by a call to
|
|
// `then`, `all`, `race`, etc.
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|
bool mIsLastInChain;
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// `true` if PromiseDebugging has already notified at least one observer that
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|
// this promise was left uncaught, `false` otherwise.
|
|
bool mWasNotifiedAsUncaught;
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// The time when this promise was created.
|
|
TimeStamp mCreationTimestamp;
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// The time when this promise transitioned out of the pending state.
|
|
TimeStamp mSettlementTimestamp;
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// Once `GetID()` has been called, a unique-to-the-process identifier for this
|
|
// promise. Until then, `0`.
|
|
uint64_t mID;
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|
#else // SPIDERMONKEY_PROMISE
|
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JS::Heap<JSObject*> mPromiseObj;
|
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#endif // SPIDERMONKEY_PROMISE
|
|
};
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NS_DEFINE_STATIC_IID_ACCESSOR(Promise, NS_PROMISE_IID)
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_Promise_h
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