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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "ChromeWorker.h"
#include "mozilla/AppShutdown.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/WorkerBinding.h"
#include "nsContentUtils.h"
#include "nsIXPConnect.h"
#include "WorkerPrivate.h"
namespace mozilla::dom {
/* static */
already_AddRefed<ChromeWorker> ChromeWorker::Constructor(
const GlobalObject& aGlobal, const nsAString& aScriptURL,
const WorkerOptions& aOptions, ErrorResult& aRv) {
// Dump the JS stack if somebody's creating a ChromeWorker after shutdown has
// begun. See bug 1813353.
if (xpc::IsInAutomation() &&
AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdown)) {
NS_WARNING("ChromeWorker construction during shutdown");
nsCOMPtr<nsIXPConnect> xpc = nsIXPConnect::XPConnect();
Unused << xpc->DebugDumpJSStack(true, true, false);
}
JSContext* cx = aGlobal.Context();
RefPtr<WorkerPrivate> workerPrivate = WorkerPrivate::Constructor(
cx, aScriptURL, true /* aIsChromeWorker */, WorkerKindDedicated,
RequestCredentials::Omit, aOptions.mType, aOptions.mName, VoidCString(),
nullptr /*aLoadInfo */, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
nsCOMPtr<nsIGlobalObject> globalObject =
do_QueryInterface(aGlobal.GetAsSupports());
RefPtr<ChromeWorker> worker =
new ChromeWorker(globalObject, workerPrivate.forget());
return worker.forget();
}
/* static */
bool ChromeWorker::WorkerAvailable(JSContext* aCx, JSObject* /* unused */) {
// Chrome is always allowed to use workers, and content is never
// allowed to use ChromeWorker, so all we have to check is the
// caller. However, chrome workers apparently might not have a
// system principal, so we have to check for them manually.
if (NS_IsMainThread()) {
return nsContentUtils::IsSystemCaller(aCx);
}
return GetWorkerPrivateFromContext(aCx)->IsChromeWorker();
}
ChromeWorker::ChromeWorker(nsIGlobalObject* aGlobalObject,
already_AddRefed<WorkerPrivate> aWorkerPrivate)
: Worker(aGlobalObject, std::move(aWorkerPrivate)) {}
ChromeWorker::~ChromeWorker() = default;
JSObject* ChromeWorker::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
JS::Rooted<JSObject*> wrapper(
aCx, ChromeWorker_Binding::Wrap(aCx, this, aGivenProto));
if (wrapper) {
// Most DOM objects don't assume they have a reflector. If they don't have
// one and need one, they create it. But in workers code, we assume that the
// reflector is always present. In order to guarantee that it's always
// present, we have to preserve it. Otherwise the GC will happily collect it
// as needed.
MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));
}
return wrapper;
}
} // namespace mozilla::dom
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