зеркало из https://github.com/mozilla/gecko-dev.git
74 строки
2.5 KiB
C++
74 строки
2.5 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ChromeWorker.h"
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#include "mozilla/dom/WorkerBinding.h"
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#include "nsContentUtils.h"
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#include "WorkerPrivate.h"
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namespace mozilla {
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namespace dom {
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/* static */
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already_AddRefed<ChromeWorker> ChromeWorker::Constructor(
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const GlobalObject& aGlobal, const nsAString& aScriptURL,
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ErrorResult& aRv) {
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JSContext* cx = aGlobal.Context();
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RefPtr<WorkerPrivate> workerPrivate = WorkerPrivate::Constructor(
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cx, aScriptURL, true /* aIsChromeWorker */, WorkerTypeDedicated,
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EmptyString(), VoidCString(), nullptr /*aLoadInfo */, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return nullptr;
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}
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nsCOMPtr<nsIGlobalObject> globalObject =
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do_QueryInterface(aGlobal.GetAsSupports());
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RefPtr<ChromeWorker> worker =
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new ChromeWorker(globalObject, workerPrivate.forget());
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return worker.forget();
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}
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/* static */
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bool ChromeWorker::WorkerAvailable(JSContext* aCx, JSObject* /* unused */) {
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// Chrome is always allowed to use workers, and content is never
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// allowed to use ChromeWorker, so all we have to check is the
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// caller. However, chrome workers apparently might not have a
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// system principal, so we have to check for them manually.
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if (NS_IsMainThread()) {
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return nsContentUtils::IsSystemCaller(aCx);
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}
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return GetWorkerPrivateFromContext(aCx)->IsChromeWorker();
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}
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ChromeWorker::ChromeWorker(nsIGlobalObject* aGlobalObject,
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already_AddRefed<WorkerPrivate> aWorkerPrivate)
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: Worker(aGlobalObject, std::move(aWorkerPrivate)) {}
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ChromeWorker::~ChromeWorker() = default;
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JSObject* ChromeWorker::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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JS::Rooted<JSObject*> wrapper(
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aCx, ChromeWorker_Binding::Wrap(aCx, this, aGivenProto));
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if (wrapper) {
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// Most DOM objects don't assume they have a reflector. If they don't have
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// one and need one, they create it. But in workers code, we assume that the
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// reflector is always present. In order to guarantee that it's always
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// present, we have to preserve it. Otherwise the GC will happily collect it
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// as needed.
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MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));
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}
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return wrapper;
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}
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} // namespace dom
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} // namespace mozilla
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