dom/workers/WorkerPrivate.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 19 May 2017 17:49:41 +0900
changeset 407399 b75c111837a802ceb953dba50a3c5a193d53ca22
parent 406955 d52a1c7cf0a3b3ec9019e0d5562b47b11866024c
child 407320 3a6693755c7d248bf40d6cf5caea365677da12ed
permissions -rw-r--r--
Bug 1339543 part 4 Change nsIWidget::ExecuteNativeKeyBinding() to nsIWidget::GetEditCommands() which just retrieves edit commands for the type r=smaug Now, nsIWidget::ExecuteNativeKeyBinding() isn't used by anybody for executing edit commands. Instead, they need array of edit commands for the key combination. So, the method should be renamed to GetEditCommands() and just return edit commands as an array. MozReview-Commit-ID: 4G0B1lJ8Lbe

/* -*- 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 "WorkerPrivate.h"

#include "amIAddonManager.h"
#include "nsIClassInfo.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIConsoleService.h"
#include "nsIDOMDOMException.h"
#include "nsIDOMEvent.h"
#include "nsIDocument.h"
#include "nsIDocShell.h"
#include "nsIInterfaceRequestor.h"
#include "nsIMemoryReporter.h"
#include "nsINetworkInterceptController.h"
#include "nsIPermissionManager.h"
#include "nsIScriptError.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptSecurityManager.h"
#include "nsIScriptTimeoutHandler.h"
#include "nsITabChild.h"
#include "nsITextToSubURI.h"
#include "nsIThreadInternal.h"
#include "nsITimer.h"
#include "nsIURI.h"
#include "nsIURL.h"
#include "nsIWeakReferenceUtils.h"
#include "nsIWorkerDebugger.h"
#include "nsIXPConnect.h"
#include "nsPIDOMWindow.h"
#include "nsGlobalWindow.h"

#include <algorithm>
#include "ImageContainer.h"
#include "jsfriendapi.h"
#include "js/MemoryMetrics.h"
#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/Likely.h"
#include "mozilla/LoadContext.h"
#include "mozilla/Move.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Console.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/ErrorEvent.h"
#include "mozilla/dom/ErrorEventBinding.h"
#include "mozilla/dom/Exceptions.h"
#include "mozilla/dom/ExtendableMessageEventBinding.h"
#include "mozilla/dom/FunctionBinding.h"
#include "mozilla/dom/IndexedDatabaseManager.h"
#include "mozilla/dom/MessageEvent.h"
#include "mozilla/dom/MessageEventBinding.h"
#include "mozilla/dom/MessagePort.h"
#include "mozilla/dom/MessagePortBinding.h"
#include "mozilla/dom/nsCSPUtils.h"
#include "mozilla/dom/Performance.h"
#include "mozilla/dom/PMessagePort.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/PromiseDebugging.h"
#include "mozilla/dom/PromiseNativeHandler.h"
#include "mozilla/dom/SimpleGlobalObject.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/StructuredCloneHolder.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/dom/WorkerBinding.h"
#include "mozilla/dom/WorkerDebuggerGlobalScopeBinding.h"
#include "mozilla/dom/WorkerGlobalScopeBinding.h"
#include "mozilla/Preferences.h"
#include "mozilla/SizePrintfMacros.h"
#include "mozilla/ThrottledEventQueue.h"
#include "mozilla/TimelineConsumers.h"
#include "mozilla/WorkerTimelineMarker.h"
#include "nsAlgorithm.h"
#include "nsContentUtils.h"
#include "nsCycleCollector.h"
#include "nsError.h"
#include "nsDOMJSUtils.h"
#include "nsHostObjectProtocolHandler.h"
#include "nsJSEnvironment.h"
#include "nsJSUtils.h"
#include "nsNetUtil.h"
#include "nsPrintfCString.h"
#include "nsProxyRelease.h"
#include "nsQueryObject.h"
#include "nsSandboxFlags.h"
#include "nsScriptError.h"
#include "nsUTF8Utils.h"
#include "prthread.h"
#include "xpcpublic.h"

#ifdef ANDROID
#include <android/log.h>
#endif

#ifdef DEBUG
#include "nsThreadManager.h"
#endif

#include "Navigator.h"
#include "Principal.h"
#include "RuntimeService.h"
#include "ScriptLoader.h"
#include "ServiceWorkerEvents.h"
#include "ServiceWorkerManager.h"
#include "SharedWorker.h"
#include "WorkerDebuggerManager.h"
#include "WorkerHolder.h"
#include "WorkerNavigator.h"
#include "WorkerRunnable.h"
#include "WorkerScope.h"
#include "WorkerThread.h"

// JS_MaybeGC will run once every second during normal execution.
#define PERIODIC_GC_TIMER_DELAY_SEC 1

// A shrinking GC will run five seconds after the last event is processed.
#define IDLE_GC_TIMER_DELAY_SEC 5

#define PREF_WORKERS_ENABLED "dom.workers.enabled"

static mozilla::LazyLogModule sWorkerPrivateLog("WorkerPrivate");
static mozilla::LazyLogModule sWorkerTimeoutsLog("WorkerTimeouts");

mozilla::LogModule*
WorkerLog()
{
  return sWorkerPrivateLog;
}

mozilla::LogModule*
TimeoutsLog()
{
  return sWorkerTimeoutsLog;
}

#define LOG(log, _args) MOZ_LOG(log, LogLevel::Debug, _args);

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::ipc;

USING_WORKERS_NAMESPACE

MOZ_DEFINE_MALLOC_SIZE_OF(JsWorkerMallocSizeOf)

#ifdef DEBUG

BEGIN_WORKERS_NAMESPACE

void
AssertIsOnMainThread()
{
  MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
}

END_WORKERS_NAMESPACE

#endif

namespace {

#ifdef DEBUG

const nsIID kDEBUGWorkerEventTargetIID = {
  0xccaba3fa, 0x5be2, 0x4de2, { 0xba, 0x87, 0x3b, 0x3b, 0x5b, 0x1d, 0x5, 0xfb }
};

#endif

template <class T>
class AutoPtrComparator
{
  typedef nsAutoPtr<T> A;
  typedef T* B;

public:
  bool Equals(const A& a, const B& b) const {
    return a && b ? *a == *b : !a && !b ? true : false;
  }
  bool LessThan(const A& a, const B& b) const {
    return a && b ? *a < *b : b ? true : false;
  }
};

template <class T>
inline AutoPtrComparator<T>
GetAutoPtrComparator(const nsTArray<nsAutoPtr<T> >&)
{
  return AutoPtrComparator<T>();
}

// Specialize this if there's some class that has multiple nsISupports bases.
template <class T>
struct ISupportsBaseInfo
{
  typedef T ISupportsBase;
};

template <template <class> class SmartPtr, class T>
inline void
SwapToISupportsArray(SmartPtr<T>& aSrc,
                     nsTArray<nsCOMPtr<nsISupports> >& aDest)
{
  nsCOMPtr<nsISupports>* dest = aDest.AppendElement();

  T* raw = nullptr;
  aSrc.swap(raw);

  nsISupports* rawSupports =
    static_cast<typename ISupportsBaseInfo<T>::ISupportsBase*>(raw);
  dest->swap(rawSupports);
}

// This class is used to wrap any runnables that the worker receives via the
// nsIEventTarget::Dispatch() method (either from NS_DispatchToCurrentThread or
// from the worker's EventTarget).
class ExternalRunnableWrapper final : public WorkerRunnable
{
  nsCOMPtr<nsIRunnable> mWrappedRunnable;

public:
  ExternalRunnableWrapper(WorkerPrivate* aWorkerPrivate,
                          nsIRunnable* aWrappedRunnable)
  : WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mWrappedRunnable(aWrappedRunnable)
  {
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aWrappedRunnable);
  }

  NS_DECL_ISUPPORTS_INHERITED

private:
  ~ExternalRunnableWrapper()
  { }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    nsresult rv = mWrappedRunnable->Run();
    if (NS_FAILED(rv)) {
      if (!JS_IsExceptionPending(aCx)) {
        Throw(aCx, rv);
      }
      return false;
    }
    return true;
  }

  nsresult
  Cancel() override
  {
    nsresult rv;
    nsCOMPtr<nsICancelableRunnable> cancelable =
      do_QueryInterface(mWrappedRunnable);
    MOZ_ASSERT(cancelable); // We checked this earlier!
    rv = cancelable->Cancel();
    nsresult rv2 = WorkerRunnable::Cancel();
    return NS_FAILED(rv) ? rv : rv2;
  }
};

struct WindowAction
{
  nsPIDOMWindowInner* mWindow;
  bool mDefaultAction;

  MOZ_IMPLICIT WindowAction(nsPIDOMWindowInner* aWindow)
  : mWindow(aWindow), mDefaultAction(true)
  { }

  bool
  operator==(const WindowAction& aOther) const
  {
    return mWindow == aOther.mWindow;
  }
};

void
LogErrorToConsole(const WorkerErrorReport& aReport, uint64_t aInnerWindowId)
{
  AssertIsOnMainThread();

  RefPtr<nsScriptErrorBase> scriptError = new nsScriptError();
  NS_WARNING_ASSERTION(scriptError, "Failed to create script error!");

  if (scriptError) {
    nsAutoCString category("Web Worker");
    if (NS_FAILED(scriptError->InitWithWindowID(aReport.mMessage,
                                                aReport.mFilename,
                                                aReport.mLine,
                                                aReport.mLineNumber,
                                                aReport.mColumnNumber,
                                                aReport.mFlags,
                                                category,
                                                aInnerWindowId))) {
      NS_WARNING("Failed to init script error!");
      scriptError = nullptr;
    }

    for (size_t i = 0, len = aReport.mNotes.Length(); i < len; i++) {
      const WorkerErrorNote& note = aReport.mNotes.ElementAt(i);

      nsScriptErrorNote* noteObject = new nsScriptErrorNote();
      noteObject->Init(note.mMessage, note.mFilename,
                       note.mLineNumber, note.mColumnNumber);
      scriptError->AddNote(noteObject);
    }
  }

  nsCOMPtr<nsIConsoleService> consoleService =
    do_GetService(NS_CONSOLESERVICE_CONTRACTID);
  NS_WARNING_ASSERTION(consoleService, "Failed to get console service!");

  if (consoleService) {
    if (scriptError) {
      if (NS_SUCCEEDED(consoleService->LogMessage(scriptError))) {
        return;
      }
      NS_WARNING("LogMessage failed!");
    } else if (NS_SUCCEEDED(consoleService->LogStringMessage(
                              aReport.mMessage.BeginReading()))) {
      return;
    }
    NS_WARNING("LogStringMessage failed!");
  }

  NS_ConvertUTF16toUTF8 msg(aReport.mMessage);
  NS_ConvertUTF16toUTF8 filename(aReport.mFilename);

  static const char kErrorString[] = "JS error in Web Worker: %s [%s:%u]";

#ifdef ANDROID
  __android_log_print(ANDROID_LOG_INFO, "Gecko", kErrorString, msg.get(),
                      filename.get(), aReport.mLineNumber);
#endif

  fprintf(stderr, kErrorString, msg.get(), filename.get(), aReport.mLineNumber);
  fflush(stderr);
}

class MainThreadReleaseRunnable final : public Runnable
{
  nsTArray<nsCOMPtr<nsISupports>> mDoomed;
  nsCOMPtr<nsILoadGroup> mLoadGroupToCancel;

public:
  MainThreadReleaseRunnable(nsTArray<nsCOMPtr<nsISupports>>& aDoomed,
                            nsCOMPtr<nsILoadGroup>& aLoadGroupToCancel)
  {
    mDoomed.SwapElements(aDoomed);
    mLoadGroupToCancel.swap(aLoadGroupToCancel);
  }

  NS_DECL_ISUPPORTS_INHERITED

  NS_IMETHOD
  Run() override
  {
    if (mLoadGroupToCancel) {
      mLoadGroupToCancel->Cancel(NS_BINDING_ABORTED);
      mLoadGroupToCancel = nullptr;
    }

    mDoomed.Clear();
    return NS_OK;
  }

private:
  ~MainThreadReleaseRunnable()
  { }
};

class WorkerFinishedRunnable final : public WorkerControlRunnable
{
  WorkerPrivate* mFinishedWorker;

public:
  WorkerFinishedRunnable(WorkerPrivate* aWorkerPrivate,
                         WorkerPrivate* aFinishedWorker)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mFinishedWorker(aFinishedWorker)
  { }

private:
  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    // Silence bad assertions.
    return true;
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    // Silence bad assertions.
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    if (!mFinishedWorker->ProxyReleaseMainThreadObjects()) {
      NS_WARNING("Failed to dispatch, going to leak!");
    }

    RuntimeService* runtime = RuntimeService::GetService();
    NS_ASSERTION(runtime, "This should never be null!");

    mFinishedWorker->DisableDebugger();

    runtime->UnregisterWorker(mFinishedWorker);

    mFinishedWorker->ClearSelfRef();
    return true;
  }
};

class TopLevelWorkerFinishedRunnable final : public Runnable
{
  WorkerPrivate* mFinishedWorker;

public:
  explicit TopLevelWorkerFinishedRunnable(WorkerPrivate* aFinishedWorker)
  : mFinishedWorker(aFinishedWorker)
  {
    aFinishedWorker->AssertIsOnWorkerThread();
  }

  NS_DECL_ISUPPORTS_INHERITED

private:
  ~TopLevelWorkerFinishedRunnable() {}

  NS_IMETHOD
  Run() override
  {
    AssertIsOnMainThread();

    RuntimeService* runtime = RuntimeService::GetService();
    MOZ_ASSERT(runtime);

    mFinishedWorker->DisableDebugger();

    runtime->UnregisterWorker(mFinishedWorker);

    if (!mFinishedWorker->ProxyReleaseMainThreadObjects()) {
      NS_WARNING("Failed to dispatch, going to leak!");
    }

    mFinishedWorker->ClearSelfRef();
    return NS_OK;
  }
};

class ModifyBusyCountRunnable final : public WorkerControlRunnable
{
  bool mIncrease;

public:
  ModifyBusyCountRunnable(WorkerPrivate* aWorkerPrivate, bool aIncrease)
  : WorkerControlRunnable(aWorkerPrivate, ParentThreadUnchangedBusyCount),
    mIncrease(aIncrease)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    return aWorkerPrivate->ModifyBusyCount(mIncrease);
  }

  virtual void
  PostRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate, bool aRunResult)
          override
  {
    if (mIncrease) {
      WorkerControlRunnable::PostRun(aCx, aWorkerPrivate, aRunResult);
      return;
    }
    // Don't do anything here as it's possible that aWorkerPrivate has been
    // deleted.
  }
};

class ReportCompileErrorRunnable final : public WorkerRunnable
{
public:
  static void
  CreateAndDispatch(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
  {
    MOZ_ASSERT(aWorkerPrivate);
    aWorkerPrivate->AssertIsOnWorkerThread();

    RefPtr<ReportCompileErrorRunnable> runnable =
      new ReportCompileErrorRunnable(aCx, aWorkerPrivate);
    runnable->Dispatch();
  }

private:
  ReportCompileErrorRunnable(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
    : WorkerRunnable(aWorkerPrivate, ParentThreadUnchangedBusyCount)
  {
    aWorkerPrivate->AssertIsOnWorkerThread();
  }

  void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    aWorkerPrivate->AssertIsOnWorkerThread();

    // Dispatch may fail if the worker was canceled, no need to report that as
    // an error, so don't call base class PostDispatch.
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    if (aWorkerPrivate->IsFrozen() ||
        aWorkerPrivate->IsParentWindowPaused()) {
      MOZ_ASSERT(!IsDebuggerRunnable());
      aWorkerPrivate->QueueRunnable(this);
      return true;
    }

    if (aWorkerPrivate->IsSharedWorker()) {
      aWorkerPrivate->BroadcastErrorToSharedWorkers(aCx, nullptr,
                                                    /* isErrorEvent */ false);
      return true;
    }

    if (aWorkerPrivate->IsServiceWorker()) {
      RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
      if (swm) {
        swm->HandleError(aCx, aWorkerPrivate->GetPrincipal(),
                         aWorkerPrivate->ServiceWorkerScope(),
                         aWorkerPrivate->ScriptURL(),
                         EmptyString(), EmptyString(), EmptyString(),
                         0, 0, JSREPORT_ERROR, JSEXN_ERR);
      }
      return true;
    }

    if (!aWorkerPrivate->IsAcceptingEvents()) {
      return true;
    }

    RefPtr<Event> event =
      Event::Constructor(aWorkerPrivate, NS_LITERAL_STRING("error"),
                         EventInit());
    event->SetTrusted(true);

    nsEventStatus status = nsEventStatus_eIgnore;
    aWorkerPrivate->DispatchDOMEvent(nullptr, event, nullptr, &status);
    return true;
  }
};

class CompileScriptRunnable final : public WorkerRunnable
{
  nsString mScriptURL;

public:
  explicit CompileScriptRunnable(WorkerPrivate* aWorkerPrivate,
                                 const nsAString& aScriptURL)
  : WorkerRunnable(aWorkerPrivate),
    mScriptURL(aScriptURL)
  { }

private:
  // We can't implement PreRun effectively, because at the point when that would
  // run we have not yet done our load so don't know things like our final
  // principal and whatnot.

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->AssertIsOnWorkerThread();

    ErrorResult rv;
    scriptloader::LoadMainScript(aWorkerPrivate, mScriptURL, WorkerScript, rv);
    rv.WouldReportJSException();
    // Explicitly ignore NS_BINDING_ABORTED on rv.  Or more precisely, still
    // return false and don't SetWorkerScriptExecutedSuccessfully() in that
    // case, but don't throw anything on aCx.  The idea is to not dispatch error
    // events if our load is canceled with that error code.
    if (rv.ErrorCodeIs(NS_BINDING_ABORTED)) {
      rv.SuppressException();
      return false;
    }

    WorkerGlobalScope* globalScope = aWorkerPrivate->GlobalScope();
    if (NS_WARN_IF(!globalScope)) {
      // We never got as far as calling GetOrCreateGlobalScope, or it failed.
      // We have no way to enter a compartment, hence no sane way to report this
      // error.  :(
      rv.SuppressException();
      return false;
    }

    // Make sure to propagate exceptions from rv onto aCx, so that they will get
    // reported after we return.  We want to propagate just JS exceptions,
    // because all the other errors are handled when the script is loaded.
    // See: https://dom.spec.whatwg.org/#concept-event-fire
    if (rv.Failed() && !rv.IsJSException()) {
      ReportCompileErrorRunnable::CreateAndDispatch(aCx, aWorkerPrivate);
      rv.SuppressException();
      return false;
    }

    // This is a little dumb, but aCx is in the null compartment here because we
    // set it up that way in our Run(), since we had not created the global at
    // that point yet.  So we need to enter the compartment of our global,
    // because setting a pending exception on aCx involves wrapping into its
    // current compartment.  Luckily we have a global now.
    JSAutoCompartment ac(aCx, globalScope->GetGlobalJSObject());
    if (rv.MaybeSetPendingException(aCx)) {
      return false;
    }

    aWorkerPrivate->SetWorkerScriptExecutedSuccessfully();
    return true;
  }
};

class CompileDebuggerScriptRunnable final : public WorkerDebuggerRunnable
{
  nsString mScriptURL;

public:
  CompileDebuggerScriptRunnable(WorkerPrivate* aWorkerPrivate,
                                const nsAString& aScriptURL)
  : WorkerDebuggerRunnable(aWorkerPrivate),
    mScriptURL(aScriptURL)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->AssertIsOnWorkerThread();

    WorkerDebuggerGlobalScope* globalScope =
      aWorkerPrivate->CreateDebuggerGlobalScope(aCx);
    if (!globalScope) {
      NS_WARNING("Failed to make global!");
      return false;
    }

    JS::Rooted<JSObject*> global(aCx, globalScope->GetWrapper());

    ErrorResult rv;
    JSAutoCompartment ac(aCx, global);
    scriptloader::LoadMainScript(aWorkerPrivate, mScriptURL,
                                 DebuggerScript, rv);
    rv.WouldReportJSException();
    // Explicitly ignore NS_BINDING_ABORTED on rv.  Or more precisely, still
    // return false and don't SetWorkerScriptExecutedSuccessfully() in that
    // case, but don't throw anything on aCx.  The idea is to not dispatch error
    // events if our load is canceled with that error code.
    if (rv.ErrorCodeIs(NS_BINDING_ABORTED)) {
      rv.SuppressException();
      return false;
    }
    // Make sure to propagate exceptions from rv onto aCx, so that they will get
    // reported after we return.  We do this for all failures on rv, because now
    // we're using rv to track all the state we care about.
    if (rv.MaybeSetPendingException(aCx)) {
      return false;
    }

    return true;
  }
};

class MessageEventRunnable final : public WorkerRunnable
                                 , public StructuredCloneHolder
{
public:
  MessageEventRunnable(WorkerPrivate* aWorkerPrivate,
                       TargetAndBusyBehavior aBehavior)
  : WorkerRunnable(aWorkerPrivate, aBehavior)
  , StructuredCloneHolder(CloningSupported, TransferringSupported,
                          StructuredCloneScope::SameProcessDifferentThread)
  {
  }

  bool
  DispatchDOMEvent(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
                   DOMEventTargetHelper* aTarget, bool aIsMainThread)
  {
    nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(aTarget->GetParentObject());

    // For some workers without window, parent is null and we try to find it
    // from the JS Context.
    if (!parent) {
      JS::Rooted<JSObject*> globalObject(aCx, JS::CurrentGlobalOrNull(aCx));
      if (NS_WARN_IF(!globalObject)) {
        return false;
      }

      parent = xpc::NativeGlobal(globalObject);
      if (NS_WARN_IF(!parent)) {
        return false;
      }
    }

    MOZ_ASSERT(parent);

    JS::Rooted<JS::Value> messageData(aCx);
    ErrorResult rv;

    UniquePtr<AbstractTimelineMarker> start;
    UniquePtr<AbstractTimelineMarker> end;
    RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
    bool isTimelineRecording = timelines && !timelines->IsEmpty();

    if (isTimelineRecording) {
      start = MakeUnique<WorkerTimelineMarker>(aIsMainThread
        ? ProfileTimelineWorkerOperationType::DeserializeDataOnMainThread
        : ProfileTimelineWorkerOperationType::DeserializeDataOffMainThread,
        MarkerTracingType::START);
    }

    Read(parent, aCx, &messageData, rv);

    if (isTimelineRecording) {
      end = MakeUnique<WorkerTimelineMarker>(aIsMainThread
        ? ProfileTimelineWorkerOperationType::DeserializeDataOnMainThread
        : ProfileTimelineWorkerOperationType::DeserializeDataOffMainThread,
        MarkerTracingType::END);
      timelines->AddMarkerForAllObservedDocShells(start);
      timelines->AddMarkerForAllObservedDocShells(end);
    }

    if (NS_WARN_IF(rv.Failed())) {
      xpc::Throw(aCx, rv.StealNSResult());
      return false;
    }

    Sequence<OwningNonNull<MessagePort>> ports;
    if (!TakeTransferredPortsAsSequence(ports)) {
      return false;
    }

    nsCOMPtr<nsIDOMEvent> domEvent;
    RefPtr<MessageEvent> event = new MessageEvent(aTarget, nullptr, nullptr);
    event->InitMessageEvent(nullptr,
                            NS_LITERAL_STRING("message"),
                            false /* non-bubbling */,
                            false /* cancelable */,
                            messageData,
                            EmptyString(),
                            EmptyString(),
                            nullptr,
                            ports);
    domEvent = do_QueryObject(event);

    domEvent->SetTrusted(true);

    nsEventStatus dummy = nsEventStatus_eIgnore;
    aTarget->DispatchDOMEvent(nullptr, domEvent, nullptr, &dummy);

    return true;
  }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    if (mBehavior == ParentThreadUnchangedBusyCount) {
      // Don't fire this event if the JS object has been disconnected from the
      // private object.
      if (!aWorkerPrivate->IsAcceptingEvents()) {
        return true;
      }

      if (aWorkerPrivate->IsFrozen() ||
          aWorkerPrivate->IsParentWindowPaused()) {
        MOZ_ASSERT(!IsDebuggerRunnable());
        aWorkerPrivate->QueueRunnable(this);
        return true;
      }

      aWorkerPrivate->AssertInnerWindowIsCorrect();

      return DispatchDOMEvent(aCx, aWorkerPrivate, aWorkerPrivate,
                              !aWorkerPrivate->GetParent());
    }

    MOZ_ASSERT(aWorkerPrivate == GetWorkerPrivateFromContext(aCx));

    return DispatchDOMEvent(aCx, aWorkerPrivate, aWorkerPrivate->GlobalScope(),
                            false);
  }
};

class DebuggerMessageEventRunnable : public WorkerDebuggerRunnable {
  nsString mMessage;

public:
  DebuggerMessageEventRunnable(WorkerPrivate* aWorkerPrivate,
                               const nsAString& aMessage)
  : WorkerDebuggerRunnable(aWorkerPrivate),
    mMessage(aMessage)
  {
  }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    WorkerDebuggerGlobalScope* globalScope = aWorkerPrivate->DebuggerGlobalScope();
    MOZ_ASSERT(globalScope);

    JS::Rooted<JSString*> message(aCx, JS_NewUCStringCopyN(aCx, mMessage.get(),
                                                           mMessage.Length()));
    if (!message) {
      return false;
    }
    JS::Rooted<JS::Value> data(aCx, JS::StringValue(message));

    RefPtr<MessageEvent> event = new MessageEvent(globalScope, nullptr,
                                                    nullptr);
    event->InitMessageEvent(nullptr,
                            NS_LITERAL_STRING("message"),
                            false, // canBubble
                            true, // cancelable
                            data,
                            EmptyString(),
                            EmptyString(),
                            nullptr,
                            Sequence<OwningNonNull<MessagePort>>());
    event->SetTrusted(true);

    nsCOMPtr<nsIDOMEvent> domEvent = do_QueryObject(event);
    nsEventStatus status = nsEventStatus_eIgnore;
    globalScope->DispatchDOMEvent(nullptr, domEvent, nullptr, &status);
    return true;
  }
};

class NotifyRunnable final : public WorkerControlRunnable
{
  Status mStatus;

public:
  NotifyRunnable(WorkerPrivate* aWorkerPrivate, Status aStatus)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mStatus(aStatus)
  {
    MOZ_ASSERT(aStatus == Closing || aStatus == Terminating ||
               aStatus == Canceling || aStatus == Killing);
  }

private:
  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->AssertIsOnParentThread();
    return aWorkerPrivate->ModifyBusyCount(true);
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    aWorkerPrivate->AssertIsOnParentThread();
    if (!aDispatchResult) {
      // We couldn't dispatch to the worker, which means it's already dead.
      // Undo the busy count modification.
      aWorkerPrivate->ModifyBusyCount(false);
    }
  }

  virtual void
  PostRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate, bool aRunResult)
          override
  {
    aWorkerPrivate->ModifyBusyCountFromWorker(false);
    return;
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    bool ok = aWorkerPrivate->NotifyInternal(aCx, mStatus);
    MOZ_ASSERT(!JS_IsExceptionPending(aCx));
    return ok;
  }
};

class FreezeRunnable final : public WorkerControlRunnable
{
public:
  explicit FreezeRunnable(WorkerPrivate* aWorkerPrivate)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    return aWorkerPrivate->FreezeInternal();
  }
};

class ThawRunnable final : public WorkerControlRunnable
{
public:
  explicit ThawRunnable(WorkerPrivate* aWorkerPrivate)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    return aWorkerPrivate->ThawInternal();
  }
};

class ReportErrorToConsoleRunnable final : public WorkerRunnable
{
  const char* mMessage;

public:
  // aWorkerPrivate is the worker thread we're on (or the main thread, if null)
  static void
  Report(WorkerPrivate* aWorkerPrivate, const char* aMessage)
  {
    if (aWorkerPrivate) {
      aWorkerPrivate->AssertIsOnWorkerThread();
    } else {
      AssertIsOnMainThread();
    }

    // Now fire a runnable to do the same on the parent's thread if we can.
    if (aWorkerPrivate) {
      RefPtr<ReportErrorToConsoleRunnable> runnable =
        new ReportErrorToConsoleRunnable(aWorkerPrivate, aMessage);
      runnable->Dispatch();
      return;
    }

    // Log a warning to the console.
    nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
                                    NS_LITERAL_CSTRING("DOM"),
                                    nullptr,
                                    nsContentUtils::eDOM_PROPERTIES,
                                    aMessage);
  }

private:
  ReportErrorToConsoleRunnable(WorkerPrivate* aWorkerPrivate, const char* aMessage)
  : WorkerRunnable(aWorkerPrivate, ParentThreadUnchangedBusyCount),
    mMessage(aMessage)
  { }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    aWorkerPrivate->AssertIsOnWorkerThread();

    // Dispatch may fail if the worker was canceled, no need to report that as
    // an error, so don't call base class PostDispatch.
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    WorkerPrivate* parent = aWorkerPrivate->GetParent();
    MOZ_ASSERT_IF(!parent, NS_IsMainThread());
    Report(parent, mMessage);
    return true;
  }
};

class ReportErrorRunnable final : public WorkerRunnable
{
  WorkerErrorReport mReport;

public:
  // aWorkerPrivate is the worker thread we're on (or the main thread, if null)
  // aTarget is the worker object that we are going to fire an error at
  // (if any).
  static void
  ReportError(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
              bool aFireAtScope, WorkerPrivate* aTarget,
              const WorkerErrorReport& aReport, uint64_t aInnerWindowId,
              JS::Handle<JS::Value> aException = JS::NullHandleValue)
  {
    if (aWorkerPrivate) {
      aWorkerPrivate->AssertIsOnWorkerThread();
    } else {
      AssertIsOnMainThread();
    }

    // We should not fire error events for warnings but instead make sure that
    // they show up in the error console.
    if (!JSREPORT_IS_WARNING(aReport.mFlags)) {
      // First fire an ErrorEvent at the worker.
      RootedDictionary<ErrorEventInit> init(aCx);

      if (aReport.mMutedError) {
        init.mMessage.AssignLiteral("Script error.");
      } else {
        init.mMessage = aReport.mMessage;
        init.mFilename = aReport.mFilename;
        init.mLineno = aReport.mLineNumber;
        init.mError = aException;
      }

      init.mCancelable = true;
      init.mBubbles = false;

      if (aTarget) {
        RefPtr<ErrorEvent> event =
          ErrorEvent::Constructor(aTarget, NS_LITERAL_STRING("error"), init);
        event->SetTrusted(true);

        nsEventStatus status = nsEventStatus_eIgnore;
        aTarget->DispatchDOMEvent(nullptr, event, nullptr, &status);

        if (status == nsEventStatus_eConsumeNoDefault) {
          return;
        }
      }

      // Now fire an event at the global object, but don't do that if the error
      // code is too much recursion and this is the same script threw the error.
      // XXXbz the interaction of this with worker errors seems kinda broken.
      // An overrecursion in the debugger or debugger sandbox will get turned
      // into an error event on our parent worker!
      // https://bugzilla.mozilla.org/show_bug.cgi?id=1271441 tracks making this
      // better.
      if (aFireAtScope &&
          (aTarget || aReport.mErrorNumber != JSMSG_OVER_RECURSED)) {
        JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
        NS_ASSERTION(global, "This should never be null!");

        nsEventStatus status = nsEventStatus_eIgnore;
        nsIScriptGlobalObject* sgo;

        if (aWorkerPrivate) {
          WorkerGlobalScope* globalScope = nullptr;
          UNWRAP_OBJECT(WorkerGlobalScope, global, globalScope);

          if (!globalScope) {
            WorkerDebuggerGlobalScope* globalScope = nullptr;
            UNWRAP_OBJECT(WorkerDebuggerGlobalScope, global, globalScope);

            MOZ_ASSERT_IF(globalScope, globalScope->GetWrapperPreserveColor() == global);
            if (globalScope || IsDebuggerSandbox(global)) {
              aWorkerPrivate->ReportErrorToDebugger(aReport.mFilename, aReport.mLineNumber,
                                                    aReport.mMessage);
              return;
            }

            MOZ_ASSERT(SimpleGlobalObject::SimpleGlobalType(global) ==
                         SimpleGlobalObject::GlobalType::BindingDetail);
            // XXXbz We should really log this to console, but unwinding out of
            // this stuff without ending up firing any events is ... hard.  Just
            // return for now.
            // https://bugzilla.mozilla.org/show_bug.cgi?id=1271441 tracks
            // making this better.
            return;
          }

          MOZ_ASSERT(globalScope->GetWrapperPreserveColor() == global);
          nsIDOMEventTarget* target = static_cast<nsIDOMEventTarget*>(globalScope);

          RefPtr<ErrorEvent> event =
            ErrorEvent::Constructor(aTarget, NS_LITERAL_STRING("error"), init);
          event->SetTrusted(true);

          if (NS_FAILED(EventDispatcher::DispatchDOMEvent(target, nullptr,
                                                          event, nullptr,
                                                          &status))) {
            NS_WARNING("Failed to dispatch worker thread error event!");
            status = nsEventStatus_eIgnore;
          }
        }
        else if ((sgo = nsJSUtils::GetStaticScriptGlobal(global))) {
          MOZ_ASSERT(NS_IsMainThread());

          if (NS_FAILED(sgo->HandleScriptError(init, &status))) {
            NS_WARNING("Failed to dispatch main thread error event!");
            status = nsEventStatus_eIgnore;
          }
        }

        // Was preventDefault() called?
        if (status == nsEventStatus_eConsumeNoDefault) {
          return;
        }
      }
    }

    // Now fire a runnable to do the same on the parent's thread if we can.
    if (aWorkerPrivate) {
      RefPtr<ReportErrorRunnable> runnable =
        new ReportErrorRunnable(aWorkerPrivate, aReport);
      runnable->Dispatch();
      return;
    }

    // Otherwise log an error to the error console.
    LogErrorToConsole(aReport, aInnerWindowId);
  }

private:
  ReportErrorRunnable(WorkerPrivate* aWorkerPrivate,
                      const WorkerErrorReport& aReport)
  : WorkerRunnable(aWorkerPrivate, ParentThreadUnchangedBusyCount),
    mReport(aReport)
  { }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    aWorkerPrivate->AssertIsOnWorkerThread();

    // Dispatch may fail if the worker was canceled, no need to report that as
    // an error, so don't call base class PostDispatch.
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    JS::Rooted<JSObject*> target(aCx, aWorkerPrivate->GetWrapper());

    uint64_t innerWindowId;
    bool fireAtScope = true;

    bool workerIsAcceptingEvents = aWorkerPrivate->IsAcceptingEvents();

    WorkerPrivate* parent = aWorkerPrivate->GetParent();
    if (parent) {
      innerWindowId = 0;
    }
    else {
      AssertIsOnMainThread();

      if (aWorkerPrivate->IsFrozen() ||
          aWorkerPrivate->IsParentWindowPaused()) {
        MOZ_ASSERT(!IsDebuggerRunnable());
        aWorkerPrivate->QueueRunnable(this);
        return true;
      }

      if (aWorkerPrivate->IsSharedWorker()) {
        aWorkerPrivate->BroadcastErrorToSharedWorkers(aCx, &mReport,
                                                      /* isErrorEvent */ true);
        return true;
      }

      // Service workers do not have a main thread parent global, so normal
      // worker error reporting will crash.  Instead, pass the error to
      // the ServiceWorkerManager to report on any controlled documents.
      if (aWorkerPrivate->IsServiceWorker()) {
        RefPtr<ServiceWorkerManager> swm = ServiceWorkerManager::GetInstance();
        if (swm) {
          swm->HandleError(aCx, aWorkerPrivate->GetPrincipal(),
                           aWorkerPrivate->ServiceWorkerScope(),
                           aWorkerPrivate->ScriptURL(),
                           mReport.mMessage,
                           mReport.mFilename, mReport.mLine, mReport.mLineNumber,
                           mReport.mColumnNumber, mReport.mFlags,
                           mReport.mExnType);
        }
        return true;
      }

      // The innerWindowId is only required if we are going to ReportError
      // below, which is gated on this condition. The inner window correctness
      // check is only going to succeed when the worker is accepting events.
      if (workerIsAcceptingEvents) {
        aWorkerPrivate->AssertInnerWindowIsCorrect();
        innerWindowId = aWorkerPrivate->WindowID();
      }
    }

    // Don't fire this event if the JS object has been disconnected from the
    // private object.
    if (!workerIsAcceptingEvents) {
      return true;
    }

    ReportError(aCx, parent, fireAtScope, aWorkerPrivate, mReport,
                innerWindowId);
    return true;
  }
};

class TimerRunnable final : public WorkerRunnable,
                            public nsITimerCallback
{
public:
  NS_DECL_ISUPPORTS_INHERITED

  explicit TimerRunnable(WorkerPrivate* aWorkerPrivate)
  : WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
  { }

private:
  ~TimerRunnable() {}

  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    // Silence bad assertions.
    return true;
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    // Silence bad assertions.
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    return aWorkerPrivate->RunExpiredTimeouts(aCx);
  }

  NS_IMETHOD
  Notify(nsITimer* aTimer) override
  {
    return Run();
  }
};

NS_IMPL_ISUPPORTS_INHERITED(TimerRunnable, WorkerRunnable, nsITimerCallback)

class DebuggerImmediateRunnable : public WorkerRunnable
{
  RefPtr<dom::Function> mHandler;

public:
  explicit DebuggerImmediateRunnable(WorkerPrivate* aWorkerPrivate,
                                     dom::Function& aHandler)
  : WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mHandler(&aHandler)
  { }

private:
  virtual bool
  IsDebuggerRunnable() const override
  {
    return true;
  }

  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    // Silence bad assertions.
    return true;
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    // Silence bad assertions.
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));
    JS::Rooted<JS::Value> callable(aCx, JS::ObjectOrNullValue(mHandler->CallableOrNull()));
    JS::HandleValueArray args = JS::HandleValueArray::empty();
    JS::Rooted<JS::Value> rval(aCx);
    if (!JS_CallFunctionValue(aCx, global, callable, args, &rval)) {
      // Just return false; WorkerRunnable::Run will report the exception.
      return false;
    }

    return true;
  }
};

void
PeriodicGCTimerCallback(nsITimer* aTimer, void* aClosure)
{
  auto workerPrivate = static_cast<WorkerPrivate*>(aClosure);
  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
  workerPrivate->AssertIsOnWorkerThread();
  workerPrivate->GarbageCollectInternal(workerPrivate->GetJSContext(),
                                        false /* shrinking */,
                                        false /* collect children */);
}

void
IdleGCTimerCallback(nsITimer* aTimer, void* aClosure)
{
  auto workerPrivate = static_cast<WorkerPrivate*>(aClosure);
  MOZ_DIAGNOSTIC_ASSERT(workerPrivate);
  workerPrivate->AssertIsOnWorkerThread();
  workerPrivate->GarbageCollectInternal(workerPrivate->GetJSContext(),
                                        true /* shrinking */,
                                        false /* collect children */);
}

class UpdateContextOptionsRunnable final : public WorkerControlRunnable
{
  JS::ContextOptions mContextOptions;

public:
  UpdateContextOptionsRunnable(WorkerPrivate* aWorkerPrivate,
                               const JS::ContextOptions& aContextOptions)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mContextOptions(aContextOptions)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->UpdateContextOptionsInternal(aCx, mContextOptions);
    return true;
  }
};

class UpdatePreferenceRunnable final : public WorkerControlRunnable
{
  WorkerPreference mPref;
  bool mValue;

public:
  UpdatePreferenceRunnable(WorkerPrivate* aWorkerPrivate,
                           WorkerPreference aPref,
                           bool aValue)
    : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
      mPref(aPref),
      mValue(aValue)
  { }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->UpdatePreferenceInternal(mPref, mValue);
    return true;
  }
};

class UpdateLanguagesRunnable final : public WorkerRunnable
{
  nsTArray<nsString> mLanguages;

public:
  UpdateLanguagesRunnable(WorkerPrivate* aWorkerPrivate,
                          const nsTArray<nsString>& aLanguages)
    : WorkerRunnable(aWorkerPrivate),
      mLanguages(aLanguages)
  { }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->UpdateLanguagesInternal(mLanguages);
    return true;
  }
};

class UpdateJSWorkerMemoryParameterRunnable final :
  public WorkerControlRunnable
{
  uint32_t mValue;
  JSGCParamKey mKey;

public:
  UpdateJSWorkerMemoryParameterRunnable(WorkerPrivate* aWorkerPrivate,
                                        JSGCParamKey aKey,
                                        uint32_t aValue)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mValue(aValue), mKey(aKey)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->UpdateJSWorkerMemoryParameterInternal(aCx, mKey, mValue);
    return true;
  }
};

#ifdef JS_GC_ZEAL
class UpdateGCZealRunnable final : public WorkerControlRunnable
{
  uint8_t mGCZeal;
  uint32_t mFrequency;

public:
  UpdateGCZealRunnable(WorkerPrivate* aWorkerPrivate,
                       uint8_t aGCZeal,
                       uint32_t aFrequency)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mGCZeal(aGCZeal), mFrequency(aFrequency)
  { }

private:
  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->UpdateGCZealInternal(aCx, mGCZeal, mFrequency);
    return true;
  }
};
#endif

class GarbageCollectRunnable final : public WorkerControlRunnable
{
  bool mShrinking;
  bool mCollectChildren;

public:
  GarbageCollectRunnable(WorkerPrivate* aWorkerPrivate, bool aShrinking,
                         bool aCollectChildren)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mShrinking(aShrinking), mCollectChildren(aCollectChildren)
  { }

private:
  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    // Silence bad assertions, this can be dispatched from either the main
    // thread or the timer thread..
    return true;
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    // Silence bad assertions, this can be dispatched from either the main
    // thread or the timer thread..
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    aWorkerPrivate->GarbageCollectInternal(aCx, mShrinking, mCollectChildren);
    return true;
  }
};

class CycleCollectRunnable : public WorkerControlRunnable
{
  bool mCollectChildren;

public:
  CycleCollectRunnable(WorkerPrivate* aWorkerPrivate, bool aCollectChildren)
  : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount),
    mCollectChildren(aCollectChildren)
  { }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
  {
    aWorkerPrivate->CycleCollectInternal(mCollectChildren);
    return true;
  }
};

class OfflineStatusChangeRunnable : public WorkerRunnable
{
public:
  OfflineStatusChangeRunnable(WorkerPrivate* aWorkerPrivate, bool aIsOffline)
    : WorkerRunnable(aWorkerPrivate),
      mIsOffline(aIsOffline)
  {
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
  {
    aWorkerPrivate->OfflineStatusChangeEventInternal(mIsOffline);
    return true;
  }

private:
  bool mIsOffline;
};

class MemoryPressureRunnable : public WorkerControlRunnable
{
public:
  explicit MemoryPressureRunnable(WorkerPrivate* aWorkerPrivate)
    : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
  {}

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
  {
    aWorkerPrivate->MemoryPressureInternal();
    return true;
  }
};

#ifdef DEBUG
static bool
StartsWithExplicit(nsACString& s)
{
    return StringBeginsWith(s, NS_LITERAL_CSTRING("explicit/"));
}
#endif

class MessagePortRunnable final : public WorkerRunnable
{
  MessagePortIdentifier mPortIdentifier;

public:
  MessagePortRunnable(WorkerPrivate* aWorkerPrivate, MessagePort* aPort)
  : WorkerRunnable(aWorkerPrivate)
  {
    MOZ_ASSERT(aPort);
    // In order to move the port from one thread to another one, we have to
    // close and disentangle it. The output will be a MessagePortIdentifier that
    // will be used to recreate a new MessagePort on the other thread.
    aPort->CloneAndDisentangle(mPortIdentifier);
  }

private:
  ~MessagePortRunnable()
  { }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    return aWorkerPrivate->ConnectMessagePort(aCx, mPortIdentifier);
  }

  nsresult
  Cancel() override
  {
    MessagePort::ForceClose(mPortIdentifier);
    return WorkerRunnable::Cancel();
  }
};

class DummyRunnable final
  : public WorkerRunnable
{
public:
  explicit
  DummyRunnable(WorkerPrivate* aWorkerPrivate)
    : WorkerRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
  {
    aWorkerPrivate->AssertIsOnWorkerThread();
  }

private:
  ~DummyRunnable()
  {
    mWorkerPrivate->AssertIsOnWorkerThread();
  }

  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    MOZ_ASSERT_UNREACHABLE("Should never call Dispatch on this!");
    return true;
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    MOZ_ASSERT_UNREACHABLE("Should never call Dispatch on this!");
  }

  virtual bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    // Do nothing.
    return true;
  }
};

PRThread*
PRThreadFromThread(nsIThread* aThread)
{
  MOZ_ASSERT(aThread);

  PRThread* result;
  MOZ_ALWAYS_SUCCEEDS(aThread->GetPRThread(&result));
  MOZ_ASSERT(result);

  return result;
}

} /* anonymous namespace */

NS_IMPL_ISUPPORTS_INHERITED0(MainThreadReleaseRunnable, Runnable)

NS_IMPL_ISUPPORTS_INHERITED0(TopLevelWorkerFinishedRunnable, Runnable)

namespace {

class WrappedControlRunnable final : public WorkerControlRunnable
{
  nsCOMPtr<nsIRunnable> mInner;

  ~WrappedControlRunnable()
  {
  }

public:
  WrappedControlRunnable(WorkerPrivate* aWorkerPrivate,
                         already_AddRefed<nsIRunnable>&& aInner)
    : WorkerControlRunnable(aWorkerPrivate, WorkerThreadUnchangedBusyCount)
    , mInner(aInner)
  {
  }

  virtual bool
  PreDispatch(WorkerPrivate* aWorkerPrivate) override
  {
    // Silence bad assertions, this can be dispatched from any thread.
    return true;
  }

  virtual void
  PostDispatch(WorkerPrivate* aWorkerPrivate, bool aDispatchResult) override
  {
    // Silence bad assertions, this can be dispatched from any thread.
  }

  bool
  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
  {
    mInner->Run();
    return true;
  }

  nsresult
  Cancel() override
  {
    // First run the default cancelation code
    WorkerControlRunnable::Cancel();

    // Attempt to cancel the inner runnable as well
    nsCOMPtr<nsICancelableRunnable> cr = do_QueryInterface(mInner);
    if (cr) {
      return cr->Cancel();
    }
    return NS_OK;
  }
};

} // anonymous namespace

BEGIN_WORKERS_NAMESPACE

class WorkerControlEventTarget final : public nsIEventTarget
{
  mozilla::Mutex mMutex;
  WorkerPrivate* mWorkerPrivate;

  ~WorkerControlEventTarget() = default;

public:
  explicit WorkerControlEventTarget(WorkerPrivate* aWorkerPrivate)
    : mMutex("WorkerControlEventTarget")
    , mWorkerPrivate(aWorkerPrivate)
  {
    MOZ_DIAGNOSTIC_ASSERT(mWorkerPrivate);
  }

  void
  ForgetWorkerPrivate(WorkerPrivate* aWorkerPrivate)
  {
    MutexAutoLock lock(mMutex);
    MOZ_DIAGNOSTIC_ASSERT(mWorkerPrivate == aWorkerPrivate);
    mWorkerPrivate = nullptr;
  }

  NS_IMETHOD
  DispatchFromScript(nsIRunnable* aRunnable, uint32_t aFlags) override
  {
    nsCOMPtr<nsIRunnable> runnable(aRunnable);
    return Dispatch(runnable.forget(), aFlags);
  }

  NS_IMETHOD
  Dispatch(already_AddRefed<nsIRunnable> aRunnable, uint32_t aFlags) override
  {
    MutexAutoLock lock(mMutex);

    if (!mWorkerPrivate) {
      return NS_ERROR_FAILURE;
    }

    RefPtr<WorkerControlRunnable> r = new WrappedControlRunnable(mWorkerPrivate,
                                                                 Move(aRunnable));
    if (!r->Dispatch()) {
      return NS_ERROR_FAILURE;
    }

    return NS_OK;
  }

  NS_IMETHOD
  DelayedDispatch(already_AddRefed<nsIRunnable>, uint32_t) override
  {
    return NS_ERROR_NOT_IMPLEMENTED;
  }

  NS_IMETHOD
  IsOnCurrentThread(bool* aIsOnCurrentThread) override
  {
    MOZ_ASSERT(aIsOnCurrentThread);
    MutexAutoLock lock(mMutex);

    if (!mWorkerPrivate) {
      *aIsOnCurrentThread = false;
      return NS_OK;
    }

    return mWorkerPrivate->IsOnCurrentThread(aIsOnCurrentThread);
  }

  NS_DECL_THREADSAFE_ISUPPORTS
};

NS_IMPL_ISUPPORTS(WorkerControlEventTarget, nsIEventTarget)

END_WORKERS_NAMESPACE

WorkerLoadInfo::WorkerLoadInfo()
  : mLoadFlags(nsIRequest::LOAD_NORMAL)
  , mWindowID(UINT64_MAX)
  , mServiceWorkerID(0)
  , mReferrerPolicy(net::RP_Unset)
  , mFromWindow(false)
  , mEvalAllowed(false)
  , mReportCSPViolations(false)
  , mXHRParamsAllowed(false)
  , mPrincipalIsSystem(false)
  , mStorageAllowed(false)
  , mServiceWorkersTestingInWindow(false)
{
  MOZ_COUNT_CTOR(WorkerLoadInfo);
}

WorkerLoadInfo::~WorkerLoadInfo()
{
  MOZ_COUNT_DTOR(WorkerLoadInfo);
}

void
WorkerLoadInfo::StealFrom(WorkerLoadInfo& aOther)
{
  MOZ_ASSERT(!mBaseURI);
  aOther.mBaseURI.swap(mBaseURI);

  MOZ_ASSERT(!mResolvedScriptURI);
  aOther.mResolvedScriptURI.swap(mResolvedScriptURI);

  MOZ_ASSERT(!mPrincipal);
  aOther.mPrincipal.swap(mPrincipal);

  MOZ_ASSERT(!mScriptContext);
  aOther.mScriptContext.swap(mScriptContext);

  MOZ_ASSERT(!mWindow);
  aOther.mWindow.swap(mWindow);

  MOZ_ASSERT(!mCSP);
  aOther.mCSP.swap(mCSP);

  MOZ_ASSERT(!mChannel);
  aOther.mChannel.swap(mChannel);

  MOZ_ASSERT(!mLoadGroup);
  aOther.mLoadGroup.swap(mLoadGroup);

  MOZ_ASSERT(!mLoadFailedAsyncRunnable);
  aOther.mLoadFailedAsyncRunnable.swap(mLoadFailedAsyncRunnable);

  MOZ_ASSERT(!mInterfaceRequestor);
  aOther.mInterfaceRequestor.swap(mInterfaceRequestor);

  MOZ_ASSERT(!mPrincipalInfo);
  mPrincipalInfo = aOther.mPrincipalInfo.forget();

  mDomain = aOther.mDomain;
  mOrigin = aOther.mOrigin;
  mServiceWorkerCacheName = aOther.mServiceWorkerCacheName;
  mLoadFlags = aOther.mLoadFlags;
  mWindowID = aOther.mWindowID;
  mServiceWorkerID = aOther.mServiceWorkerID;
  mReferrerPolicy = aOther.mReferrerPolicy;
  mFromWindow = aOther.mFromWindow;
  mEvalAllowed = aOther.mEvalAllowed;
  mReportCSPViolations = aOther.mReportCSPViolations;
  mXHRParamsAllowed = aOther.mXHRParamsAllowed;
  mPrincipalIsSystem = aOther.mPrincipalIsSystem;
  mStorageAllowed = aOther.mStorageAllowed;
  mServiceWorkersTestingInWindow = aOther.mServiceWorkersTestingInWindow;
  mOriginAttributes = aOther.mOriginAttributes;
}

nsresult
WorkerLoadInfo::SetPrincipalOnMainThread(nsIPrincipal* aPrincipal,
                                         nsILoadGroup* aLoadGroup)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(NS_LoadGroupMatchesPrincipal(aLoadGroup, aPrincipal));

  mPrincipal = aPrincipal;
  mPrincipalIsSystem = nsContentUtils::IsSystemPrincipal(aPrincipal);

  nsresult rv = aPrincipal->GetCsp(getter_AddRefs(mCSP));
  NS_ENSURE_SUCCESS(rv, rv);

  if (mCSP) {
    mCSP->GetAllowsEval(&mReportCSPViolations, &mEvalAllowed);
    // Set ReferrerPolicy
    bool hasReferrerPolicy = false;
    uint32_t rp = mozilla::net::RP_Unset;

    rv = mCSP->GetReferrerPolicy(&rp, &hasReferrerPolicy);
    NS_ENSURE_SUCCESS(rv, rv);

    if (hasReferrerPolicy) {
      mReferrerPolicy = static_cast<net::ReferrerPolicy>(rp);
    }
  } else {
    mEvalAllowed = true;
    mReportCSPViolations = false;
  }

  mLoadGroup = aLoadGroup;

  mPrincipalInfo = new PrincipalInfo();
  mOriginAttributes = nsContentUtils::GetOriginAttributes(aLoadGroup);

  rv = PrincipalToPrincipalInfo(aPrincipal, mPrincipalInfo);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = nsContentUtils::GetUTFOrigin(aPrincipal, mOrigin);
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

nsresult
WorkerLoadInfo::GetPrincipalAndLoadGroupFromChannel(nsIChannel* aChannel,
                                                    nsIPrincipal** aPrincipalOut,
                                                    nsILoadGroup** aLoadGroupOut)
{
  AssertIsOnMainThread();
  MOZ_DIAGNOSTIC_ASSERT(aChannel);
  MOZ_DIAGNOSTIC_ASSERT(aPrincipalOut);
  MOZ_DIAGNOSTIC_ASSERT(aLoadGroupOut);

  // Initial triggering principal should be set
  MOZ_DIAGNOSTIC_ASSERT(mPrincipal);

  nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
  MOZ_DIAGNOSTIC_ASSERT(ssm);

  nsCOMPtr<nsIPrincipal> channelPrincipal;
  nsresult rv = ssm->GetChannelResultPrincipal(aChannel, getter_AddRefs(channelPrincipal));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsILoadGroup> channelLoadGroup;
  rv = aChannel->GetLoadGroup(getter_AddRefs(channelLoadGroup));
  NS_ENSURE_SUCCESS(rv, rv);
  MOZ_ASSERT(channelLoadGroup);

  // If the load principal is the system principal then the channel
  // principal must also be the system principal (we do not allow chrome
  // code to create workers with non-chrome scripts, and if we ever decide
  // to change this we need to make sure we don't always set
  // mPrincipalIsSystem to true in WorkerPrivate::GetLoadInfo()). Otherwise
  // this channel principal must be same origin with the load principal (we
  // check again here in case redirects changed the location of the script).
  if (nsContentUtils::IsSystemPrincipal(mPrincipal)) {
    if (!nsContentUtils::IsSystemPrincipal(channelPrincipal)) {
      nsCOMPtr<nsIURI> finalURI;
      rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(finalURI));
      NS_ENSURE_SUCCESS(rv, rv);

      // See if this is a resource URI. Since JSMs usually come from
      // resource:// URIs we're currently considering all URIs with the
      // URI_IS_UI_RESOURCE flag as valid for creating privileged workers.
      bool isResource;
      rv = NS_URIChainHasFlags(finalURI,
                               nsIProtocolHandler::URI_IS_UI_RESOURCE,
                               &isResource);
      NS_ENSURE_SUCCESS(rv, rv);

      if (isResource) {
        // Assign the system principal to the resource:// worker only if it
        // was loaded from code using the system principal.
        channelPrincipal = mPrincipal;
      } else {
        return NS_ERROR_DOM_BAD_URI;
      }
    }
  }

  // The principal can change, but it should still match the original
  // load group's appId and browser element flag.
  MOZ_ASSERT(NS_LoadGroupMatchesPrincipal(channelLoadGroup, channelPrincipal));

  channelPrincipal.forget(aPrincipalOut);
  channelLoadGroup.forget(aLoadGroupOut);

  return NS_OK;
}

nsresult
WorkerLoadInfo::SetPrincipalFromChannel(nsIChannel* aChannel)
{
  AssertIsOnMainThread();

  nsCOMPtr<nsIPrincipal> principal;
  nsCOMPtr<nsILoadGroup> loadGroup;
  nsresult rv = GetPrincipalAndLoadGroupFromChannel(aChannel,
                                                    getter_AddRefs(principal),
                                                    getter_AddRefs(loadGroup));
  NS_ENSURE_SUCCESS(rv, rv);

  return SetPrincipalOnMainThread(principal, loadGroup);
}

#if defined(DEBUG) || !defined(RELEASE_OR_BETA)
bool
WorkerLoadInfo::FinalChannelPrincipalIsValid(nsIChannel* aChannel)
{
  AssertIsOnMainThread();

  nsCOMPtr<nsIPrincipal> principal;
  nsCOMPtr<nsILoadGroup> loadGroup;
  nsresult rv = GetPrincipalAndLoadGroupFromChannel(aChannel,
                                                    getter_AddRefs(principal),
                                                    getter_AddRefs(loadGroup));
  NS_ENSURE_SUCCESS(rv, false);


  // Verify that the channel is still a null principal.  We don't care
  // if these are the exact same null principal object, though.  From
  // the worker's perspective its the same effect.
  if (principal->GetIsNullPrincipal() && mPrincipal->GetIsNullPrincipal()) {
    return true;
  }

  // Otherwise we require exact equality.  Redirects can happen, but they
  // are not allowed to change our principal.
  if (principal->Equals(mPrincipal)) {
    return true;
  }

  return false;
}

bool
WorkerLoadInfo::PrincipalIsValid() const
{
  return mPrincipal && mPrincipalInfo &&
         mPrincipalInfo->type() != PrincipalInfo::T__None &&
         mPrincipalInfo->type() <= PrincipalInfo::T__Last;
}

bool
WorkerLoadInfo::PrincipalURIMatchesScriptURL()
{
  AssertIsOnMainThread();

  nsAutoCString scheme;
  nsresult rv = mBaseURI->GetScheme(scheme);
  NS_ENSURE_SUCCESS(rv, false);

  // A system principal must either be a blob URL or a resource JSM.
  if (mPrincipal->GetIsSystemPrincipal()) {
    if (scheme == NS_LITERAL_CSTRING("blob")) {
      return true;
    }

    bool isResource = false;
    nsresult rv = NS_URIChainHasFlags(mBaseURI,
                                      nsIProtocolHandler::URI_IS_UI_RESOURCE,
                                      &isResource);
    NS_ENSURE_SUCCESS(rv, false);

    return isResource;
  }

  // A null principal can occur for a data URL worker script or a blob URL
  // worker script from a sandboxed iframe.
  if (mPrincipal->GetIsNullPrincipal()) {
    return scheme == NS_LITERAL_CSTRING("data") ||
           scheme == NS_LITERAL_CSTRING("blob");
  }

  // The principal for a blob: URL worker script does not have a matching URL.
  // This is likely a bug in our referer setting logic, but exempt it for now.
  // This is another reason we should fix bug 1340694 so that referer does not
  // depend on the principal URI.
  if (scheme == NS_LITERAL_CSTRING("blob")) {
    return true;
  }

  nsCOMPtr<nsIURI> principalURI;
  rv = mPrincipal->GetURI(getter_AddRefs(principalURI));
  NS_ENSURE_SUCCESS(rv, false);
  NS_ENSURE_TRUE(principalURI, false);

  bool equal = false;
  rv = principalURI->Equals(mBaseURI, &equal);
  NS_ENSURE_SUCCESS(rv, false);

  return equal;
}
#endif // defined(DEBUG) || !defined(RELEASE_OR_BETA)

bool
WorkerLoadInfo::ProxyReleaseMainThreadObjects(WorkerPrivate* aWorkerPrivate)
{
  nsCOMPtr<nsILoadGroup> nullLoadGroup;
  return ProxyReleaseMainThreadObjects(aWorkerPrivate, nullLoadGroup);
}

bool
WorkerLoadInfo::ProxyReleaseMainThreadObjects(WorkerPrivate* aWorkerPrivate,
                                              nsCOMPtr<nsILoadGroup>& aLoadGroupToCancel)
{

  static const uint32_t kDoomedCount = 10;
  nsTArray<nsCOMPtr<nsISupports>> doomed(kDoomedCount);

  SwapToISupportsArray(mWindow, doomed);
  SwapToISupportsArray(mScriptContext, doomed);
  SwapToISupportsArray(mBaseURI, doomed);
  SwapToISupportsArray(mResolvedScriptURI, doomed);
  SwapToISupportsArray(mPrincipal, doomed);
  SwapToISupportsArray(mChannel, doomed);
  SwapToISupportsArray(mCSP, doomed);
  SwapToISupportsArray(mLoadGroup, doomed);
  SwapToISupportsArray(mLoadFailedAsyncRunnable, doomed);
  SwapToISupportsArray(mInterfaceRequestor, doomed);
  // Before adding anything here update kDoomedCount above!

  MOZ_ASSERT(doomed.Length() == kDoomedCount);

  RefPtr<MainThreadReleaseRunnable> runnable =
    new MainThreadReleaseRunnable(doomed, aLoadGroupToCancel);
  return NS_SUCCEEDED(aWorkerPrivate->DispatchToMainThread(runnable.forget()));
}

template <class Derived>
class WorkerPrivateParent<Derived>::EventTarget final
  : public nsIEventTarget
{
  // This mutex protects mWorkerPrivate and must be acquired *before* the
  // WorkerPrivate's mutex whenever they must both be held.
  mozilla::Mutex mMutex;
  WorkerPrivate* mWorkerPrivate;
  nsIEventTarget* mWeakNestedEventTarget;
  nsCOMPtr<nsIEventTarget> mNestedEventTarget;

public:
  explicit EventTarget(WorkerPrivate* aWorkerPrivate)
  : mMutex("WorkerPrivateParent::EventTarget::mMutex"),
    mWorkerPrivate(aWorkerPrivate), mWeakNestedEventTarget(nullptr)
  {
    MOZ_ASSERT(aWorkerPrivate);
  }

  EventTarget(WorkerPrivate* aWorkerPrivate, nsIEventTarget* aNestedEventTarget)
  : mMutex("WorkerPrivateParent::EventTarget::mMutex"),
    mWorkerPrivate(aWorkerPrivate), mWeakNestedEventTarget(aNestedEventTarget),
    mNestedEventTarget(aNestedEventTarget)
  {
    MOZ_ASSERT(aWorkerPrivate);
    MOZ_ASSERT(aNestedEventTarget);
  }

  void
  Disable()
  {
    nsCOMPtr<nsIEventTarget> nestedEventTarget;
    {
      MutexAutoLock lock(mMutex);

      MOZ_ASSERT(mWorkerPrivate);
      mWorkerPrivate = nullptr;
      mNestedEventTarget.swap(nestedEventTarget);
    }
  }

  nsIEventTarget*
  GetWeakNestedEventTarget() const
  {
    MOZ_ASSERT(mWeakNestedEventTarget);
    return mWeakNestedEventTarget;
  }

  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIEVENTTARGET

private:
  ~EventTarget()
  { }
};

WorkerLoadInfo::
InterfaceRequestor::InterfaceRequestor(nsIPrincipal* aPrincipal,
                                       nsILoadGroup* aLoadGroup)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aPrincipal);

  // Look for an existing LoadContext.  This is optional and it's ok if
  // we don't find one.
  nsCOMPtr<nsILoadContext> baseContext;
  if (aLoadGroup) {
    nsCOMPtr<nsIInterfaceRequestor> callbacks;
    aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
    if (callbacks) {
      callbacks->GetInterface(NS_GET_IID(nsILoadContext),
                              getter_AddRefs(baseContext));
    }
    mOuterRequestor = callbacks;
  }

  mLoadContext = new LoadContext(aPrincipal, baseContext);
}

void
WorkerLoadInfo::
InterfaceRequestor::MaybeAddTabChild(nsILoadGroup* aLoadGroup)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (!aLoadGroup) {
    return;
  }

  nsCOMPtr<nsIInterfaceRequestor> callbacks;
  aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
  if (!callbacks) {
    return;
  }

  nsCOMPtr<nsITabChild> tabChild;
  callbacks->GetInterface(NS_GET_IID(nsITabChild), getter_AddRefs(tabChild));
  if (!tabChild) {
    return;
  }

  // Use weak references to the tab child.  Holding a strong reference will
  // not prevent an ActorDestroy() from being called on the TabChild.
  // Therefore, we should let the TabChild destroy itself as soon as possible.
  mTabChildList.AppendElement(do_GetWeakReference(tabChild));
}

NS_IMETHODIMP
WorkerLoadInfo::
InterfaceRequestor::GetInterface(const nsIID& aIID, void** aSink)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mLoadContext);

  if (aIID.Equals(NS_GET_IID(nsILoadContext))) {
    nsCOMPtr<nsILoadContext> ref = mLoadContext;
    ref.forget(aSink);
    return NS_OK;
  }

  // If we still have an active nsITabChild, then return it.  Its possible,
  // though, that all of the TabChild objects have been destroyed.  In that
  // case we return NS_NOINTERFACE.
  if (aIID.Equals(NS_GET_IID(nsITabChild))) {
    nsCOMPtr<nsITabChild> tabChild = GetAnyLiveTabChild();
    if (!tabChild) {
      return NS_NOINTERFACE;
    }
    tabChild.forget(aSink);
    return NS_OK;
  }

  if (aIID.Equals(NS_GET_IID(nsINetworkInterceptController)) &&
      mOuterRequestor) {
    // If asked for the network intercept controller, ask the outer requestor,
    // which could be the docshell.
    return mOuterRequestor->GetInterface(aIID, aSink);
  }

  return NS_NOINTERFACE;
}

already_AddRefed<nsITabChild>
WorkerLoadInfo::
InterfaceRequestor::GetAnyLiveTabChild()
{
  MOZ_ASSERT(NS_IsMainThread());

  // Search our list of known TabChild objects for one that still exists.
  while (!mTabChildList.IsEmpty()) {
    nsCOMPtr<nsITabChild> tabChild =
      do_QueryReferent(mTabChildList.LastElement());

    // Does this tab child still exist?  If so, return it.  We are done.  If the
    // PBrowser actor is no longer useful, don't bother returning this tab.
    if (tabChild && !static_cast<TabChild*>(tabChild.get())->IsDestroyed()) {
      return tabChild.forget();
    }

    // Otherwise remove the stale weak reference and check the next one
    mTabChildList.RemoveElementAt(mTabChildList.Length() - 1);
  }

  return nullptr;
}

NS_IMPL_ADDREF(WorkerLoadInfo::InterfaceRequestor)
NS_IMPL_RELEASE(WorkerLoadInfo::InterfaceRequestor)
NS_IMPL_QUERY_INTERFACE(WorkerLoadInfo::InterfaceRequestor, nsIInterfaceRequestor)

struct WorkerPrivate::TimeoutInfo
{
  TimeoutInfo()
  : mId(0), mIsInterval(false), mCanceled(false)
  {
    MOZ_COUNT_CTOR(mozilla::dom::workers::WorkerPrivate::TimeoutInfo);
  }

  ~TimeoutInfo()
  {
    MOZ_COUNT_DTOR(mozilla::dom::workers::WorkerPrivate::TimeoutInfo);
  }

  bool operator==(const TimeoutInfo& aOther)
  {
    return mTargetTime == aOther.mTargetTime;
  }

  bool operator<(const TimeoutInfo& aOther)
  {
    return mTargetTime < aOther.mTargetTime;
  }

  nsCOMPtr<nsIScriptTimeoutHandler> mHandler;
  mozilla::TimeStamp mTargetTime;
  mozilla::TimeDuration mInterval;
  int32_t mId;
  bool mIsInterval;
  bool mCanceled;
};

class WorkerJSContextStats final : public JS::RuntimeStats
{
  const nsCString mRtPath;

public:
  explicit WorkerJSContextStats(const nsACString& aRtPath)
  : JS::RuntimeStats(JsWorkerMallocSizeOf), mRtPath(aRtPath)
  { }

  ~WorkerJSContextStats()
  {
    for (size_t i = 0; i != zoneStatsVector.length(); i++) {
      delete static_cast<xpc::ZoneStatsExtras*>(zoneStatsVector[i].extra);
    }

    for (size_t i = 0; i != compartmentStatsVector.length(); i++) {
      delete static_cast<xpc::CompartmentStatsExtras*>(compartmentStatsVector[i].extra);
    }
  }

  const nsCString& Path() const
  {
    return mRtPath;
  }

  virtual void
  initExtraZoneStats(JS::Zone* aZone,
                     JS::ZoneStats* aZoneStats)
                     override
  {
    MOZ_ASSERT(!aZoneStats->extra);

    // ReportJSRuntimeExplicitTreeStats expects that
    // aZoneStats->extra is a xpc::ZoneStatsExtras pointer.
    xpc::ZoneStatsExtras* extras = new xpc::ZoneStatsExtras;
    extras->pathPrefix = mRtPath;
    extras->pathPrefix += nsPrintfCString("zone(0x%p)/", (void *)aZone);

    MOZ_ASSERT(StartsWithExplicit(extras->pathPrefix));

    aZoneStats->extra = extras;
  }

  virtual void
  initExtraCompartmentStats(JSCompartment* aCompartment,
                            JS::CompartmentStats* aCompartmentStats)
                            override
  {
    MOZ_ASSERT(!aCompartmentStats->extra);

    // ReportJSRuntimeExplicitTreeStats expects that
    // aCompartmentStats->extra is a xpc::CompartmentStatsExtras pointer.
    xpc::CompartmentStatsExtras* extras = new xpc::CompartmentStatsExtras;

    // This is the |jsPathPrefix|.  Each worker has exactly two compartments:
    // one for atoms, and one for everything else.
    extras->jsPathPrefix.Assign(mRtPath);
    extras->jsPathPrefix += nsPrintfCString("zone(0x%p)/",
                                            (void *)js::GetCompartmentZone(aCompartment));
    extras->jsPathPrefix += js::IsAtomsCompartment(aCompartment)
                            ? NS_LITERAL_CSTRING("compartment(web-worker-atoms)/")
                            : NS_LITERAL_CSTRING("compartment(web-worker)/");

    // This should never be used when reporting with workers (hence the "?!").
    extras->domPathPrefix.AssignLiteral("explicit/workers/?!/");

    MOZ_ASSERT(StartsWithExplicit(extras->jsPathPrefix));
    MOZ_ASSERT(StartsWithExplicit(extras->domPathPrefix));

    extras->location = nullptr;

    aCompartmentStats->extra = extras;
  }
};

class WorkerPrivate::MemoryReporter final : public nsIMemoryReporter
{
  NS_DECL_THREADSAFE_ISUPPORTS

  friend class WorkerPrivate;

  SharedMutex mMutex;
  WorkerPrivate* mWorkerPrivate;
  bool mAlreadyMappedToAddon;

public:
  explicit MemoryReporter(WorkerPrivate* aWorkerPrivate)
  : mMutex(aWorkerPrivate->mMutex), mWorkerPrivate(aWorkerPrivate),
    mAlreadyMappedToAddon(false)
  {
    aWorkerPrivate->AssertIsOnWorkerThread();
  }

  NS_IMETHOD
  CollectReports(nsIHandleReportCallback* aHandleReport,
                 nsISupports* aData, bool aAnonymize) override;

private:
  class FinishCollectRunnable;

  class CollectReportsRunnable final : public MainThreadWorkerControlRunnable
  {
    RefPtr<FinishCollectRunnable> mFinishCollectRunnable;
    const bool mAnonymize;

  public:
    CollectReportsRunnable(
      WorkerPrivate* aWorkerPrivate,
      nsIHandleReportCallback* aHandleReport,
      nsISupports* aHandlerData,
      bool aAnonymize,
      const nsACString& aPath);

  private:
    bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override;

    ~CollectReportsRunnable()
    {
      if (NS_IsMainThread()) {
        mFinishCollectRunnable->Run();
        return;
      }

      WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
      MOZ_ASSERT(workerPrivate);
      MOZ_ALWAYS_SUCCEEDS(
        workerPrivate->DispatchToMainThread(mFinishCollectRunnable.forget()));
    }
  };

  class FinishCollectRunnable final : public Runnable
  {
    nsCOMPtr<nsIHandleReportCallback> mHandleReport;
    nsCOMPtr<nsISupports> mHandlerData;
    const bool mAnonymize;
    bool mSuccess;

  public:
    WorkerJSContextStats mCxStats;

    explicit FinishCollectRunnable(
      nsIHandleReportCallback* aHandleReport,
      nsISupports* aHandlerData,
      bool aAnonymize,
      const nsACString& aPath);

    NS_IMETHOD Run() override;

    void SetSuccess(bool success)
    {
      mSuccess = success;
    }

  private:
    ~FinishCollectRunnable()
    {
      // mHandleReport and mHandlerData are released on the main thread.
      AssertIsOnMainThread();
    }

    FinishCollectRunnable(const FinishCollectRunnable&) = delete;
    FinishCollectRunnable& operator=(const FinishCollectRunnable&) = delete;
    FinishCollectRunnable& operator=(const FinishCollectRunnable&&) = delete;
  };

  ~MemoryReporter()
  {
  }

  void
  Disable()
  {
    // Called from WorkerPrivate::DisableMemoryReporter.
    mMutex.AssertCurrentThreadOwns();

    NS_ASSERTION(mWorkerPrivate, "Disabled more than once!");
    mWorkerPrivate = nullptr;
  }

  // Only call this from the main thread and under mMutex lock.
  void
  TryToMapAddon(nsACString &path);
};

NS_IMPL_ISUPPORTS(WorkerPrivate::MemoryReporter, nsIMemoryReporter)

NS_IMETHODIMP
WorkerPrivate::MemoryReporter::CollectReports(nsIHandleReportCallback* aHandleReport,
                                              nsISupports* aData,
                                              bool aAnonymize)
{
  AssertIsOnMainThread();

  RefPtr<CollectReportsRunnable> runnable;

  {
    MutexAutoLock lock(mMutex);

    if (!mWorkerPrivate) {
      // This will effectively report 0 memory.
      nsCOMPtr<nsIMemoryReporterManager> manager =
        do_GetService("@mozilla.org/memory-reporter-manager;1");
      if (manager) {
        manager->EndReport();
      }
      return NS_OK;
    }

    nsAutoCString path;
    path.AppendLiteral("explicit/workers/workers(");
    if (aAnonymize && !mWorkerPrivate->Domain().IsEmpty()) {
      path.AppendLiteral("<anonymized-domain>)/worker(<anonymized-url>");
    } else {
      nsAutoCString escapedDomain(mWorkerPrivate->Domain());
      if (escapedDomain.IsEmpty()) {
        escapedDomain += "chrome";
      } else {
        escapedDomain.ReplaceChar('/', '\\');
      }
      path.Append(escapedDomain);
      path.AppendLiteral(")/worker(");
      NS_ConvertUTF16toUTF8 escapedURL(mWorkerPrivate->ScriptURL());
      escapedURL.ReplaceChar('/', '\\');
      path.Append(escapedURL);
    }
    path.AppendPrintf(", 0x%p)/", static_cast<void*>(mWorkerPrivate));

    TryToMapAddon(path);

    runnable =
      new CollectReportsRunnable(mWorkerPrivate, aHandleReport, aData, aAnonymize, path);
  }

  if (!runnable->Dispatch()) {
    return NS_ERROR_UNEXPECTED;
  }

  return NS_OK;
}

void
WorkerPrivate::MemoryReporter::TryToMapAddon(nsACString &path)
{
  AssertIsOnMainThread();
  mMutex.AssertCurrentThreadOwns();

  if (mAlreadyMappedToAddon || !mWorkerPrivate) {
    return;
  }

  nsCOMPtr<nsIURI> scriptURI;
  if (NS_FAILED(NS_NewURI(getter_AddRefs(scriptURI),
                          mWorkerPrivate->ScriptURL()))) {
    return;
  }

  mAlreadyMappedToAddon = true;

  if (!XRE_IsParentProcess()) {
    // Only try to access the service from the main process.
    return;
  }

  nsAutoCString addonId;
  bool ok;
  nsCOMPtr<amIAddonManager> addonManager =
    do_GetService("@mozilla.org/addons/integration;1");

  if (!addonManager ||
      NS_FAILED(addonManager->MapURIToAddonID(scriptURI, addonId, &ok)) ||
      !ok) {
    return;
  }

  static const size_t explicitLength = strlen("explicit/");
  addonId.Insert(NS_LITERAL_CSTRING("add-ons/"), 0);
  addonId += "/";
  path.Insert(addonId, explicitLength);
}

WorkerPrivate::MemoryReporter::CollectReportsRunnable::CollectReportsRunnable(
  WorkerPrivate* aWorkerPrivate,
  nsIHandleReportCallback* aHandleReport,
  nsISupports* aHandlerData,
  bool aAnonymize,
  const nsACString& aPath)
  : MainThreadWorkerControlRunnable(aWorkerPrivate),
    mFinishCollectRunnable(
      new FinishCollectRunnable(aHandleReport, aHandlerData, aAnonymize, aPath)),
    mAnonymize(aAnonymize)
{ }

bool
WorkerPrivate::MemoryReporter::CollectReportsRunnable::WorkerRun(JSContext* aCx,
                                                                 WorkerPrivate* aWorkerPrivate)
{
  aWorkerPrivate->AssertIsOnWorkerThread();

  mFinishCollectRunnable->SetSuccess(
    aWorkerPrivate->CollectRuntimeStats(&mFinishCollectRunnable->mCxStats, mAnonymize));

  return true;
}

WorkerPrivate::MemoryReporter::FinishCollectRunnable::FinishCollectRunnable(
  nsIHandleReportCallback* aHandleReport,
  nsISupports* aHandlerData,
  bool aAnonymize,
  const nsACString& aPath)
  : mHandleReport(aHandleReport),
    mHandlerData(aHandlerData),
    mAnonymize(aAnonymize),
    mSuccess(false),
    mCxStats(aPath)
{ }

NS_IMETHODIMP
WorkerPrivate::MemoryReporter::FinishCollectRunnable::Run()
{
  AssertIsOnMainThread();

  nsCOMPtr<nsIMemoryReporterManager> manager =
    do_GetService("@mozilla.org/memory-reporter-manager;1");

  if (!manager)
    return NS_OK;

  if (mSuccess) {
    xpc::ReportJSRuntimeExplicitTreeStats(mCxStats, mCxStats.Path(),
                                          mHandleReport, mHandlerData,
                                          mAnonymize);
  }

  manager->EndReport();

  return NS_OK;
}

WorkerPrivate::SyncLoopInfo::SyncLoopInfo(EventTarget* aEventTarget)
: mEventTarget(aEventTarget), mCompleted(false), mResult(false)
#ifdef DEBUG
  , mHasRun(false)
#endif
{
}

template <class Derived>
nsIDocument*
WorkerPrivateParent<Derived>::GetDocument() const
{
  AssertIsOnMainThread();
  if (mLoadInfo.mWindow) {
    return mLoadInfo.mWindow->GetExtantDoc();
  }
  // if we don't have a document, we should query the document
  // from the parent in case of a nested worker
  WorkerPrivate* parent = mParent;
  while (parent) {
    if (parent->mLoadInfo.mWindow) {
      return parent->mLoadInfo.mWindow->GetExtantDoc();
    }
    parent = parent->GetParent();
  }
  // couldn't query a document, give up and return nullptr
  return nullptr;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::SetCSP(nsIContentSecurityPolicy* aCSP)
{
  AssertIsOnMainThread();
  if (!aCSP) {
    return;
  }
  WorkerPrivate* self = ParentAsWorkerPrivate();
  aCSP->EnsureEventTarget(self->mMainThreadEventTarget);
  mLoadInfo.mCSP = aCSP;
}

template <class Derived>
nsresult
WorkerPrivateParent<Derived>::SetCSPFromHeaderValues(const nsACString& aCSPHeaderValue,
                                                     const nsACString& aCSPReportOnlyHeaderValue)
{
  AssertIsOnMainThread();
  MOZ_DIAGNOSTIC_ASSERT(!mLoadInfo.mCSP);

  NS_ConvertASCIItoUTF16 cspHeaderValue(aCSPHeaderValue);
  NS_ConvertASCIItoUTF16 cspROHeaderValue(aCSPReportOnlyHeaderValue);

  nsCOMPtr<nsIContentSecurityPolicy> csp;
  nsresult rv = mLoadInfo.mPrincipal->EnsureCSP(nullptr, getter_AddRefs(csp));
  if (!csp) {
    return NS_OK;
  }

  WorkerPrivate* self = ParentAsWorkerPrivate();
  csp->EnsureEventTarget(self->mMainThreadEventTarget);

  // If there's a CSP header, apply it.
  if (!cspHeaderValue.IsEmpty()) {
    rv = CSP_AppendCSPFromHeader(csp, cspHeaderValue, false);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  // If there's a report-only CSP header, apply it.
  if (!cspROHeaderValue.IsEmpty()) {
    rv = CSP_AppendCSPFromHeader(csp, cspROHeaderValue, true);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Set evalAllowed, default value is set in GetAllowsEval
  bool evalAllowed = false;
  bool reportEvalViolations = false;
  rv = csp->GetAllowsEval(&reportEvalViolations, &evalAllowed);
  NS_ENSURE_SUCCESS(rv, rv);

  // Set ReferrerPolicy, default value is set in GetReferrerPolicy
  bool hasReferrerPolicy = false;
  uint32_t rp = mozilla::net::RP_Unset;
  rv = csp->GetReferrerPolicy(&rp, &hasReferrerPolicy);
  NS_ENSURE_SUCCESS(rv, rv);

  mLoadInfo.mCSP = csp;
  mLoadInfo.mEvalAllowed = evalAllowed;
  mLoadInfo.mReportCSPViolations = reportEvalViolations;

  if (hasReferrerPolicy) {
    mLoadInfo.mReferrerPolicy = static_cast<net::ReferrerPolicy>(rp);
  }

  return NS_OK;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::SetReferrerPolicyFromHeaderValue(
                                  const nsACString& aReferrerPolicyHeaderValue)
{
  NS_ConvertUTF8toUTF16 headerValue(aReferrerPolicyHeaderValue);

  if (headerValue.IsEmpty()) {
    return;
  }

  net::ReferrerPolicy policy =
    nsContentUtils::GetReferrerPolicyFromHeader(headerValue);
  if (policy == net::RP_Unset) {
    return;
  }

  SetReferrerPolicy(policy);
}


// Can't use NS_IMPL_CYCLE_COLLECTION_CLASS(WorkerPrivateParent) because of the
// templates.
template <class Derived>
typename WorkerPrivateParent<Derived>::cycleCollection
  WorkerPrivateParent<Derived>::_cycleCollectorGlobal =
    WorkerPrivateParent<Derived>::cycleCollection();

template <class Derived>
WorkerPrivateParent<Derived>::WorkerPrivateParent(
                                           WorkerPrivate* aParent,
                                           const nsAString& aScriptURL,
                                           bool aIsChromeWorker,
                                           WorkerType aWorkerType,
                                           const nsAString& aWorkerName,
                                           const nsACString& aServiceWorkerScope,
                                           WorkerLoadInfo& aLoadInfo)
: mMutex("WorkerPrivateParent Mutex"),
  mCondVar(mMutex, "WorkerPrivateParent CondVar"),
  mParent(aParent), mScriptURL(aScriptURL),
  mWorkerName(aWorkerName), mServiceWorkerScope(aServiceWorkerScope),
  mLoadingWorkerScript(false), mBusyCount(0), mParentWindowPausedDepth(0),
  mParentStatus(Pending), mParentFrozen(false),
  mIsChromeWorker(aIsChromeWorker), mMainThreadObjectsForgotten(false),
  mIsSecureContext(false), mWorkerType(aWorkerType),
  mCreationTimeStamp(TimeStamp::Now()),
  mCreationTimeHighRes((double)PR_Now() / PR_USEC_PER_MSEC)
{
  MOZ_ASSERT_IF(!IsDedicatedWorker(), NS_IsMainThread());

  if (aLoadInfo.mWindow) {
    AssertIsOnMainThread();
    MOZ_ASSERT(aLoadInfo.mWindow->IsInnerWindow(),
               "Should have inner window here!");
    BindToOwner(aLoadInfo.mWindow);
  }

  mLoadInfo.StealFrom(aLoadInfo);

  if (aParent) {
    aParent->AssertIsOnWorkerThread();

    // Note that this copies our parent's secure context state into mJSSettings.
    aParent->CopyJSSettings(mJSSettings);

    // And manually set our mIsSecureContext, though it's not really relevant to
    // dedicated workers...
    mIsSecureContext = aParent->IsSecureContext();
    MOZ_ASSERT_IF(mIsChromeWorker, mIsSecureContext);

    MOZ_ASSERT(IsDedicatedWorker());

    if (aParent->mParentFrozen) {
      Freeze(nullptr);
    }
  }
  else {
    AssertIsOnMainThread();

    RuntimeService::GetDefaultJSSettings(mJSSettings);

    // Our secure context state depends on the kind of worker we have.
    if (UsesSystemPrincipal() || IsServiceWorker()) {
      mIsSecureContext = true;
    } else if (mLoadInfo.mWindow) {
      // Shared and dedicated workers both inherit the loading window's secure
      // context state.  Shared workers then prevent windows with a different
      // secure context state from attaching to them.
      mIsSecureContext = mLoadInfo.mWindow->IsSecureContext();
    } else {
      MOZ_ASSERT_UNREACHABLE("non-chrome worker that is not a service worker "
                             "that has no parent and no associated window");
    }

    if (mIsSecureContext) {
      mJSSettings.chrome.compartmentOptions
                 .creationOptions().setSecureContext(true);
      mJSSettings.content.compartmentOptions
                 .creationOptions().setSecureContext(true);
    }

    // Our parent can get suspended after it initiates the async creation
    // of a new worker thread.  In this case suspend the new worker as well.
    if (mLoadInfo.mWindow && mLoadInfo.mWindow->IsSuspended()) {
      ParentWindowPaused();
    }

    if (mLoadInfo.mWindow && mLoadInfo.mWindow->IsFrozen()) {
      Freeze(mLoadInfo.mWindow);
    }
  }
}

template <class Derived>
WorkerPrivateParent<Derived>::~WorkerPrivateParent()
{
  DropJSObjects(this);
}

template <class Derived>
JSObject*
WorkerPrivateParent<Derived>::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  MOZ_ASSERT(!IsSharedWorker(),
             "We should never wrap a WorkerPrivate for a SharedWorker");

  AssertIsOnParentThread();

  // XXXkhuey this should not need to be rooted, the analysis is dumb.
  // See bug 980181.
  JS::Rooted<JSObject*> wrapper(aCx,
    WorkerBinding::Wrap(aCx, ParentAsWorkerPrivate(), aGivenProto));
  if (wrapper) {
    MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));
  }

  return wrapper;
}

template <class Derived>
nsresult
WorkerPrivateParent<Derived>::DispatchPrivate(already_AddRefed<WorkerRunnable> aRunnable,
                                              nsIEventTarget* aSyncLoopTarget)
{
  // May be called on any thread!
  RefPtr<WorkerRunnable> runnable(aRunnable);

  WorkerPrivate* self = ParentAsWorkerPrivate();

  {
    MutexAutoLock lock(mMutex);

    MOZ_ASSERT_IF(aSyncLoopTarget, self->mThread);

    if (!self->mThread) {
      if (ParentStatus() == Pending || self->mStatus == Pending) {
        mPreStartRunnables.AppendElement(runnable);
        return NS_OK;
      }

      NS_WARNING("Using a worker event target after the thread has already"
                 "been released!");
      return NS_ERROR_UNEXPECTED;
    }

    if (self->mStatus == Dead ||
        (!aSyncLoopTarget && ParentStatus() > Running)) {
      NS_WARNING("A runnable was posted to a worker that is already shutting "
                 "down!");
      return NS_ERROR_UNEXPECTED;
    }

    nsresult rv;
    if (aSyncLoopTarget) {
      rv = aSyncLoopTarget->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
    } else {
      rv = self->mThread->DispatchAnyThread(WorkerThreadFriendKey(), runnable.forget());
    }

    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }

    mCondVar.Notify();
  }

  return NS_OK;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::EnableDebugger()
{
  AssertIsOnParentThread();

  WorkerPrivate* self = ParentAsWorkerPrivate();

  if (NS_FAILED(RegisterWorkerDebugger(self))) {
    NS_WARNING("Failed to register worker debugger!");
    return;
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::DisableDebugger()
{
  AssertIsOnParentThread();

  WorkerPrivate* self = ParentAsWorkerPrivate();

  if (NS_FAILED(UnregisterWorkerDebugger(self))) {
    NS_WARNING("Failed to unregister worker debugger!");
  }
}

template <class Derived>
nsresult
WorkerPrivateParent<Derived>::DispatchControlRunnable(
  already_AddRefed<WorkerControlRunnable> aWorkerControlRunnable)
{
  // May be called on any thread!
  RefPtr<WorkerControlRunnable> runnable(aWorkerControlRunnable);
  MOZ_ASSERT(runnable);

  WorkerPrivate* self = ParentAsWorkerPrivate();

  {
    MutexAutoLock lock(mMutex);

    if (self->mStatus == Dead) {
      return NS_ERROR_UNEXPECTED;
    }

    // Transfer ownership to the control queue.
    self->mControlQueue.Push(runnable.forget().take());

    if (JSContext* cx = self->mJSContext) {
      MOZ_ASSERT(self->mThread);
      JS_RequestInterruptCallback(cx);
    }

    mCondVar.Notify();
  }

  return NS_OK;
}

template <class Derived>
nsresult
WorkerPrivateParent<Derived>::DispatchDebuggerRunnable(
  already_AddRefed<WorkerRunnable> aDebuggerRunnable)
{
  // May be called on any thread!

  RefPtr<WorkerRunnable> runnable(aDebuggerRunnable);

  MOZ_ASSERT(runnable);

  WorkerPrivate* self = ParentAsWorkerPrivate();

  {
    MutexAutoLock lock(mMutex);

    if (self->mStatus == Dead) {
      NS_WARNING("A debugger runnable was posted to a worker that is already "
                 "shutting down!");
      return NS_ERROR_UNEXPECTED;
    }

    // Transfer ownership to the debugger queue.
    self->mDebuggerQueue.Push(runnable.forget().take());

    mCondVar.Notify();
  }

  return NS_OK;
}

template <class Derived>
already_AddRefed<WorkerRunnable>
WorkerPrivateParent<Derived>::MaybeWrapAsWorkerRunnable(already_AddRefed<nsIRunnable> aRunnable)
{
  // May be called on any thread!

  nsCOMPtr<nsIRunnable> runnable(aRunnable);
  MOZ_ASSERT(runnable);

  RefPtr<WorkerRunnable> workerRunnable =
    WorkerRunnable::FromRunnable(runnable);
  if (workerRunnable) {
    return workerRunnable.forget();
  }

  nsCOMPtr<nsICancelableRunnable> cancelable = do_QueryInterface(runnable);
  if (!cancelable) {
    MOZ_CRASH("All runnables destined for a worker thread must be cancelable!");
  }

  workerRunnable =
    new ExternalRunnableWrapper(ParentAsWorkerPrivate(), runnable);
  return workerRunnable.forget();
}

template <class Derived>
already_AddRefed<nsIEventTarget>
WorkerPrivateParent<Derived>::GetEventTarget()
{
  WorkerPrivate* self = ParentAsWorkerPrivate();

  nsCOMPtr<nsIEventTarget> target;

  {
    MutexAutoLock lock(mMutex);

    if (!mEventTarget &&
        ParentStatus() <= Running &&
        self->mStatus <= Running) {
      mEventTarget = new EventTarget(self);
    }

    target = mEventTarget;
  }

  NS_WARNING_ASSERTION(
    target,
    "Requested event target for a worker that is already shutting down!");

  return target.forget();
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::Start()
{
  // May be called on any thread!
  {
    MutexAutoLock lock(mMutex);

    NS_ASSERTION(mParentStatus != Running, "How can this be?!");

    if (mParentStatus == Pending) {
      mParentStatus = Running;
      return true;
    }
  }

  return false;
}

// aCx is null when called from the finalizer
template <class Derived>
bool
WorkerPrivateParent<Derived>::NotifyPrivate(Status aStatus)
{
  AssertIsOnParentThread();

  bool pending;
  {
    MutexAutoLock lock(mMutex);

    if (mParentStatus >= aStatus) {
      return true;
    }

    pending = mParentStatus == Pending;
    mParentStatus = aStatus;
  }

  if (IsSharedWorker()) {
    RuntimeService* runtime = RuntimeService::GetService();
    MOZ_ASSERT(runtime);

    runtime->ForgetSharedWorker(ParentAsWorkerPrivate());
  }

  if (pending) {
    WorkerPrivate* self = ParentAsWorkerPrivate();

#ifdef DEBUG
    {
      // Fake a thread here just so that our assertions don't go off for no
      // reason.
      nsIThread* currentThread = NS_GetCurrentThread();
      MOZ_ASSERT(currentThread);

      MOZ_ASSERT(!self->mPRThread);
      self->mPRThread = PRThreadFromThread(currentThread);
      MOZ_ASSERT(self->mPRThread);
    }
#endif

    // Worker never got a chance to run, go ahead and delete it.
    self->ScheduleDeletion(WorkerPrivate::WorkerNeverRan);
    return true;
  }

  NS_ASSERTION(aStatus != Terminating || mQueuedRunnables.IsEmpty(),
               "Shouldn't have anything queued!");

  // Anything queued will be discarded.
  mQueuedRunnables.Clear();

  RefPtr<NotifyRunnable> runnable =
    new NotifyRunnable(ParentAsWorkerPrivate(), aStatus);
  return runnable->Dispatch();
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::Freeze(nsPIDOMWindowInner* aWindow)
{
  AssertIsOnParentThread();

  // Shared workers are only frozen if all of their owning documents are
  // frozen. It can happen that mSharedWorkers is empty but this thread has
  // not been unregistered yet.
  if ((IsSharedWorker() || IsServiceWorker()) && !mSharedWorkers.IsEmpty()) {
    AssertIsOnMainThread();

    bool allFrozen = true;

    for (uint32_t i = 0; i < mSharedWorkers.Length(); ++i) {
      if (aWindow && mSharedWorkers[i]->GetOwner() == aWindow) {
        // Calling Freeze() may change the refcount, ensure that the worker
        // outlives this call.
        RefPtr<SharedWorker> kungFuDeathGrip = mSharedWorkers[i];

        kungFuDeathGrip->Freeze();
      } else {
        MOZ_ASSERT_IF(mSharedWorkers[i]->GetOwner() && aWindow,
                      !SameCOMIdentity(mSharedWorkers[i]->GetOwner(),
                                       aWindow));
        if (!mSharedWorkers[i]->IsFrozen()) {
          allFrozen = false;
        }
      }
    }

    if (!allFrozen || mParentFrozen) {
      return true;
    }
  }

  mParentFrozen = true;

  {
    MutexAutoLock lock(mMutex);

    if (mParentStatus >= Terminating) {
      return true;
    }
  }

  DisableDebugger();

  RefPtr<FreezeRunnable> runnable =
    new FreezeRunnable(ParentAsWorkerPrivate());
  if (!runnable->Dispatch()) {
    return false;
  }

  return true;
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::Thaw(nsPIDOMWindowInner* aWindow)
{
  AssertIsOnParentThread();

  MOZ_ASSERT(mParentFrozen);

  // Shared workers are resumed if any of their owning documents are thawed.
  // It can happen that mSharedWorkers is empty but this thread has not been
  // unregistered yet.
  if ((IsSharedWorker() || IsServiceWorker()) && !mSharedWorkers.IsEmpty()) {
    AssertIsOnMainThread();

    bool anyRunning = false;

    for (uint32_t i = 0; i < mSharedWorkers.Length(); ++i) {
      if (aWindow && mSharedWorkers[i]->GetOwner() == aWindow) {
        // Calling Thaw() may change the refcount, ensure that the worker
        // outlives this call.
        RefPtr<SharedWorker> kungFuDeathGrip = mSharedWorkers[i];

        kungFuDeathGrip->Thaw();
        anyRunning = true;
      } else {
        MOZ_ASSERT_IF(mSharedWorkers[i]->GetOwner() && aWindow,
                      !SameCOMIdentity(mSharedWorkers[i]->GetOwner(),
                                       aWindow));
        if (!mSharedWorkers[i]->IsFrozen()) {
          anyRunning = true;
        }
      }
    }

    if (!anyRunning || !mParentFrozen) {
      return true;
    }
  }

  MOZ_ASSERT(mParentFrozen);

  mParentFrozen = false;

  {
    MutexAutoLock lock(mMutex);

    if (mParentStatus >= Terminating) {
      return true;
    }
  }

  EnableDebugger();

  // Execute queued runnables before waking up the worker, otherwise the worker
  // could post new messages before we run those that have been queued.
  if (!IsParentWindowPaused() && !mQueuedRunnables.IsEmpty()) {
    MOZ_ASSERT(IsDedicatedWorker());

    nsTArray<nsCOMPtr<nsIRunnable>> runnables;
    mQueuedRunnables.SwapElements(runnables);

    for (uint32_t index = 0; index < runnables.Length(); index++) {
      runnables[index]->Run();
    }
  }

  RefPtr<ThawRunnable> runnable =
    new ThawRunnable(ParentAsWorkerPrivate());
  if (!runnable->Dispatch()) {
    return false;
  }

  return true;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::ParentWindowPaused()
{
  AssertIsOnMainThread();
  MOZ_ASSERT_IF(IsDedicatedWorker(), mParentWindowPausedDepth == 0);
  mParentWindowPausedDepth += 1;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::ParentWindowResumed()
{
  AssertIsOnMainThread();

  MOZ_ASSERT(mParentWindowPausedDepth > 0);
  MOZ_ASSERT_IF(IsDedicatedWorker(), mParentWindowPausedDepth == 1);
  mParentWindowPausedDepth -= 1;
  if (mParentWindowPausedDepth > 0) {
    return;
  }

  {
    MutexAutoLock lock(mMutex);

    if (mParentStatus >= Terminating) {
      return;
    }
  }

  // Execute queued runnables before waking up, otherwise the worker could post
  // new messages before we run those that have been queued.
  if (!IsFrozen() && !mQueuedRunnables.IsEmpty()) {
    MOZ_ASSERT(IsDedicatedWorker());

    nsTArray<nsCOMPtr<nsIRunnable>> runnables;
    mQueuedRunnables.SwapElements(runnables);

    for (uint32_t index = 0; index < runnables.Length(); index++) {
      runnables[index]->Run();
    }
  }
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::Close()
{
  mMutex.AssertCurrentThreadOwns();

  if (mParentStatus < Closing) {
    mParentStatus = Closing;
  }

  return true;
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::ModifyBusyCount(bool aIncrease)
{
  AssertIsOnParentThread();

  NS_ASSERTION(aIncrease || mBusyCount, "Mismatched busy count mods!");

  if (aIncrease) {
    mBusyCount++;
    return true;
  }

  if (--mBusyCount == 0) {

    bool shouldCancel;
    {
      MutexAutoLock lock(mMutex);
      shouldCancel = mParentStatus == Terminating;
    }

    if (shouldCancel && !Cancel()) {
      return false;
    }
  }

  return true;
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::ProxyReleaseMainThreadObjects()
{
  AssertIsOnParentThread();
  MOZ_ASSERT(!mMainThreadObjectsForgotten);

  nsCOMPtr<nsILoadGroup> loadGroupToCancel;
  // If we're not overriden, then do nothing here.  Let the load group get
  // handled in ForgetMainThreadObjects().
  if (mLoadInfo.mInterfaceRequestor) {
    mLoadInfo.mLoadGroup.swap(loadGroupToCancel);
  }

  bool result = mLoadInfo.ProxyReleaseMainThreadObjects(ParentAsWorkerPrivate(),
                                                        loadGroupToCancel);

  mMainThreadObjectsForgotten = true;

  return result;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::PostMessageInternal(JSContext* aCx,
                                                  JS::Handle<JS::Value> aMessage,
                                                  const Sequence<JSObject*>& aTransferable,
                                                  ErrorResult& aRv)
{
  AssertIsOnParentThread();

  {
    MutexAutoLock lock(mMutex);
    if (mParentStatus > Running) {
      return;
    }
  }

  JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());

  aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
                                                          &transferable);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  RefPtr<MessageEventRunnable> runnable =
    new MessageEventRunnable(ParentAsWorkerPrivate(),
                             WorkerRunnable::WorkerThreadModifyBusyCount);

  UniquePtr<AbstractTimelineMarker> start;
  UniquePtr<AbstractTimelineMarker> end;
  RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
  bool isTimelineRecording = timelines && !timelines->IsEmpty();

  if (isTimelineRecording) {
    start = MakeUnique<WorkerTimelineMarker>(NS_IsMainThread()
      ? ProfileTimelineWorkerOperationType::SerializeDataOnMainThread
      : ProfileTimelineWorkerOperationType::SerializeDataOffMainThread,
      MarkerTracingType::START);
  }

  runnable->Write(aCx, aMessage, transferable, JS::CloneDataPolicy(), aRv);

  if (isTimelineRecording) {
    end = MakeUnique<WorkerTimelineMarker>(NS_IsMainThread()
      ? ProfileTimelineWorkerOperationType::SerializeDataOnMainThread
      : ProfileTimelineWorkerOperationType::SerializeDataOffMainThread,
      MarkerTracingType::END);
    timelines->AddMarkerForAllObservedDocShells(start);
    timelines->AddMarkerForAllObservedDocShells(end);
  }

  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  if (!runnable->Dispatch()) {
    aRv.Throw(NS_ERROR_FAILURE);
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::PostMessage(
                             JSContext* aCx, JS::Handle<JS::Value> aMessage,
                             const Sequence<JSObject*>& aTransferable,
                             ErrorResult& aRv)
{
  PostMessageInternal(aCx, aMessage, aTransferable, aRv);
}

template <class Derived>
void
WorkerPrivateParent<Derived>::UpdateContextOptions(
                                    const JS::ContextOptions& aContextOptions)
{
  AssertIsOnParentThread();

  {
    MutexAutoLock lock(mMutex);
    mJSSettings.contextOptions = aContextOptions;
  }

  RefPtr<UpdateContextOptionsRunnable> runnable =
    new UpdateContextOptionsRunnable(ParentAsWorkerPrivate(), aContextOptions);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to update worker context options!");
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::UpdatePreference(WorkerPreference aPref, bool aValue)
{
  AssertIsOnParentThread();
  MOZ_ASSERT(aPref >= 0 && aPref < WORKERPREF_COUNT);

  RefPtr<UpdatePreferenceRunnable> runnable =
    new UpdatePreferenceRunnable(ParentAsWorkerPrivate(), aPref, aValue);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to update worker preferences!");
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::UpdateLanguages(const nsTArray<nsString>& aLanguages)
{
  AssertIsOnParentThread();

  RefPtr<UpdateLanguagesRunnable> runnable =
    new UpdateLanguagesRunnable(ParentAsWorkerPrivate(), aLanguages);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to update worker languages!");
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::UpdateJSWorkerMemoryParameter(JSGCParamKey aKey,
                                                            uint32_t aValue)
{
  AssertIsOnParentThread();

  bool found = false;

  {
    MutexAutoLock lock(mMutex);
    found = mJSSettings.ApplyGCSetting(aKey, aValue);
  }

  if (found) {
    RefPtr<UpdateJSWorkerMemoryParameterRunnable> runnable =
      new UpdateJSWorkerMemoryParameterRunnable(ParentAsWorkerPrivate(), aKey,
                                                aValue);
    if (!runnable->Dispatch()) {
      NS_WARNING("Failed to update memory parameter!");
    }
  }
}

#ifdef JS_GC_ZEAL
template <class Derived>
void
WorkerPrivateParent<Derived>::UpdateGCZeal(uint8_t aGCZeal, uint32_t aFrequency)
{
  AssertIsOnParentThread();

  {
    MutexAutoLock lock(mMutex);
    mJSSettings.gcZeal = aGCZeal;
    mJSSettings.gcZealFrequency = aFrequency;
  }

  RefPtr<UpdateGCZealRunnable> runnable =
    new UpdateGCZealRunnable(ParentAsWorkerPrivate(), aGCZeal, aFrequency);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to update worker gczeal!");
  }
}
#endif

template <class Derived>
void
WorkerPrivateParent<Derived>::GarbageCollect(bool aShrinking)
{
  AssertIsOnParentThread();

  RefPtr<GarbageCollectRunnable> runnable =
    new GarbageCollectRunnable(ParentAsWorkerPrivate(), aShrinking,
                               /* collectChildren = */ true);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to GC worker!");
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::CycleCollect(bool aDummy)
{
  AssertIsOnParentThread();

  RefPtr<CycleCollectRunnable> runnable =
    new CycleCollectRunnable(ParentAsWorkerPrivate(),
                             /* collectChildren = */ true);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to CC worker!");
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::OfflineStatusChangeEvent(bool aIsOffline)
{
  AssertIsOnParentThread();

  RefPtr<OfflineStatusChangeRunnable> runnable =
    new OfflineStatusChangeRunnable(ParentAsWorkerPrivate(), aIsOffline);
  if (!runnable->Dispatch()) {
    NS_WARNING("Failed to dispatch offline status change event!");
  }
}

void
WorkerPrivate::OfflineStatusChangeEventInternal(bool aIsOffline)
{
  AssertIsOnWorkerThread();

  // The worker is already in this state. No need to dispatch an event.
  if (mOnLine == !aIsOffline) {
    return;
  }

  for (uint32_t index = 0; index < mChildWorkers.Length(); ++index) {
    mChildWorkers[index]->OfflineStatusChangeEvent(aIsOffline);
  }

  mOnLine = !aIsOffline;
  WorkerGlobalScope* globalScope = GlobalScope();
  RefPtr<WorkerNavigator> nav = globalScope->GetExistingNavigator();
  if (nav) {
    nav->SetOnLine(mOnLine);
  }

  nsString eventType;
  if (aIsOffline) {
    eventType.AssignLiteral("offline");
  } else {
    eventType.AssignLiteral("online");
  }

  RefPtr<Event> event = NS_NewDOMEvent(globalScope, nullptr, nullptr);

  event->InitEvent(eventType, false, false);
  event->SetTrusted(true);

  globalScope->DispatchDOMEvent(nullptr, event, nullptr, nullptr);
}

template <class Derived>
void
WorkerPrivateParent<Derived>::MemoryPressure(bool aDummy)
{
  AssertIsOnParentThread();

  RefPtr<MemoryPressureRunnable> runnable =
    new MemoryPressureRunnable(ParentAsWorkerPrivate());
  Unused << NS_WARN_IF(!runnable->Dispatch());
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::RegisterSharedWorker(SharedWorker* aSharedWorker,
                                                   MessagePort* aPort)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(aSharedWorker);
  MOZ_ASSERT(IsSharedWorker());
  MOZ_ASSERT(!mSharedWorkers.Contains(aSharedWorker));

  if (IsSharedWorker()) {
    RefPtr<MessagePortRunnable> runnable =
      new MessagePortRunnable(ParentAsWorkerPrivate(), aPort);
    if (!runnable->Dispatch()) {
      return false;
    }
  }

  mSharedWorkers.AppendElement(aSharedWorker);

  // If there were other SharedWorker objects attached to this worker then they
  // may all have been frozen and this worker would need to be thawed.
  if (mSharedWorkers.Length() > 1 && IsFrozen() && !Thaw(nullptr)) {
    return false;
  }

  return true;
}

template <class Derived>
void
WorkerPrivateParent<Derived>::BroadcastErrorToSharedWorkers(
                                                    JSContext* aCx,
                                                    const WorkerErrorReport* aReport,
                                                    bool aIsErrorEvent)
{
  AssertIsOnMainThread();

  if (aIsErrorEvent && JSREPORT_IS_WARNING(aReport->mFlags)) {
    // Don't fire any events anywhere.  Just log to console.
    // XXXbz should we log to all the consoles of all the relevant windows?
    MOZ_ASSERT(aReport);
    LogErrorToConsole(*aReport, 0);
    return;
  }

  AutoTArray<RefPtr<SharedWorker>, 10> sharedWorkers;
  GetAllSharedWorkers(sharedWorkers);

  if (sharedWorkers.IsEmpty()) {
    return;
  }

  AutoTArray<WindowAction, 10> windowActions;
  nsresult rv;

  // First fire the error event at all SharedWorker objects. This may include
  // multiple objects in a single window as well as objects in different
  // windows.
  for (size_t index = 0; index < sharedWorkers.Length(); index++) {
    RefPtr<SharedWorker>& sharedWorker = sharedWorkers[index];

    // May be null.
    nsPIDOMWindowInner* window = sharedWorker->GetOwner();

    RefPtr<Event> event;

    if (aIsErrorEvent) {
      RootedDictionary<ErrorEventInit> errorInit(aCx);
      errorInit.mBubbles = false;
      errorInit.mCancelable = true;
      errorInit.mMessage = aReport->mMessage;
      errorInit.mFilename = aReport->mFilename;
      errorInit.mLineno = aReport->mLineNumber;
      errorInit.mColno = aReport->mColumnNumber;

      event = ErrorEvent::Constructor(sharedWorker, NS_LITERAL_STRING("error"),
                                      errorInit);
    } else {
      event = Event::Constructor(sharedWorker, NS_LITERAL_STRING("error"),
                                 EventInit());
    }

    if (!event) {
      ThrowAndReport(window, NS_ERROR_UNEXPECTED);
      continue;
    }

    event->SetTrusted(true);

    bool defaultActionEnabled;
    nsresult rv = sharedWorker->DispatchEvent(event, &defaultActionEnabled);
    if (NS_FAILED(rv)) {
      ThrowAndReport(window, rv);
      continue;
    }

    if (!aIsErrorEvent) {
      continue;
    }

    if (defaultActionEnabled) {
      // Add the owning window to our list so that we will fire an error event
      // at it later.
      if (!windowActions.Contains(window)) {
        windowActions.AppendElement(WindowAction(window));
      }
    } else {
      size_t actionsIndex = windowActions.LastIndexOf(WindowAction(window));
      if (actionsIndex != windowActions.NoIndex) {
        // Any listener that calls preventDefault() will prevent the window from
        // receiving the error event.
        windowActions[actionsIndex].mDefaultAction = false;
      }
    }
  }

  // If there are no windows to consider further then we're done.
  if (windowActions.IsEmpty()) {
    return;
  }

  bool shouldLogErrorToConsole = true;

  // Now fire error events at all the windows remaining.
  for (uint32_t index = 0; index < windowActions.Length(); index++) {
    WindowAction& windowAction = windowActions[index];

    // If there is no window or the script already called preventDefault then
    // skip this window.
    if (!windowAction.mWindow || !windowAction.mDefaultAction) {
      continue;
    }

    nsCOMPtr<nsIScriptGlobalObject> sgo =
      do_QueryInterface(windowAction.mWindow);
    MOZ_ASSERT(sgo);

    MOZ_ASSERT(NS_IsMainThread());
    RootedDictionary<ErrorEventInit> init(aCx);
    init.mLineno = aReport->mLineNumber;
    init.mFilename = aReport->mFilename;
    init.mMessage = aReport->mMessage;
    init.mCancelable = true;
    init.mBubbles = true;

    nsEventStatus status = nsEventStatus_eIgnore;
    rv = sgo->HandleScriptError(init, &status);
    if (NS_FAILED(rv)) {
      ThrowAndReport(windowAction.mWindow, rv);
      continue;
    }

    if (status == nsEventStatus_eConsumeNoDefault) {
      shouldLogErrorToConsole = false;
    }
  }

  // Finally log a warning in the console if no window tried to prevent it.
  if (shouldLogErrorToConsole) {
    MOZ_ASSERT(aReport);
    LogErrorToConsole(*aReport, 0);
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::GetAllSharedWorkers(
                               nsTArray<RefPtr<SharedWorker>>& aSharedWorkers)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(IsSharedWorker() || IsServiceWorker());

  if (!aSharedWorkers.IsEmpty()) {
    aSharedWorkers.Clear();
  }

  for (uint32_t i = 0; i < mSharedWorkers.Length(); ++i) {
    aSharedWorkers.AppendElement(mSharedWorkers[i]);
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::CloseSharedWorkersForWindow(
                                                    nsPIDOMWindowInner* aWindow)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(IsSharedWorker() || IsServiceWorker());
  MOZ_ASSERT(aWindow);

  bool someRemoved = false;

  for (uint32_t i = 0; i < mSharedWorkers.Length();) {
    if (mSharedWorkers[i]->GetOwner() == aWindow) {
      mSharedWorkers[i]->Close();
      mSharedWorkers.RemoveElementAt(i);
      someRemoved = true;
    } else {
      MOZ_ASSERT(!SameCOMIdentity(mSharedWorkers[i]->GetOwner(),
                                  aWindow));
      ++i;
    }
  }

  if (!someRemoved) {
    return;
  }

  // If there are still SharedWorker objects attached to this worker then they
  // may all be frozen and this worker would need to be frozen. Otherwise,
  // if that was the last SharedWorker then it's time to cancel this worker.

  if (!mSharedWorkers.IsEmpty()) {
    Freeze(nullptr);
  } else {
    Cancel();
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::CloseAllSharedWorkers()
{
  AssertIsOnMainThread();
  MOZ_ASSERT(IsSharedWorker() || IsServiceWorker());

  for (uint32_t i = 0; i < mSharedWorkers.Length(); ++i) {
    mSharedWorkers[i]->Close();
  }

  mSharedWorkers.Clear();

  Cancel();
}

template <class Derived>
void
WorkerPrivateParent<Derived>::WorkerScriptLoaded()
{
  AssertIsOnMainThread();

  if (IsSharedWorker() || IsServiceWorker()) {
    // No longer need to hold references to the window or document we came from.
    mLoadInfo.mWindow = nullptr;
    mLoadInfo.mScriptContext = nullptr;
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::SetBaseURI(nsIURI* aBaseURI)
{
  AssertIsOnMainThread();

  if (!mLoadInfo.mBaseURI) {
    NS_ASSERTION(GetParent(), "Shouldn't happen without a parent!");
    mLoadInfo.mResolvedScriptURI = aBaseURI;
  }

  mLoadInfo.mBaseURI = aBaseURI;

  if (NS_FAILED(aBaseURI->GetSpec(mLocationInfo.mHref))) {
    mLocationInfo.mHref.Truncate();
  }

  mLocationInfo.mHostname.Truncate();
  nsContentUtils::GetHostOrIPv6WithBrackets(aBaseURI, mLocationInfo.mHostname);

  nsCOMPtr<nsIURL> url(do_QueryInterface(aBaseURI));
  if (!url || NS_FAILED(url->GetFilePath(mLocationInfo.mPathname))) {
    mLocationInfo.mPathname.Truncate();
  }

  nsCString temp;

  if (url && NS_SUCCEEDED(url->GetQuery(temp)) && !temp.IsEmpty()) {
    mLocationInfo.mSearch.Assign('?');
    mLocationInfo.mSearch.Append(temp);
  }

  if (NS_SUCCEEDED(aBaseURI->GetRef(temp)) && !temp.IsEmpty()) {
    if (mLocationInfo.mHash.IsEmpty()) {
      mLocationInfo.mHash.Assign('#');
      mLocationInfo.mHash.Append(temp);
    }
  }

  if (NS_SUCCEEDED(aBaseURI->GetScheme(mLocationInfo.mProtocol))) {
    mLocationInfo.mProtocol.Append(':');
  }
  else {
    mLocationInfo.mProtocol.Truncate();
  }

  int32_t port;
  if (NS_SUCCEEDED(aBaseURI->GetPort(&port)) && port != -1) {
    mLocationInfo.mPort.AppendInt(port);

    nsAutoCString host(mLocationInfo.mHostname);
    host.Append(':');
    host.Append(mLocationInfo.mPort);

    mLocationInfo.mHost.Assign(host);
  }
  else {
    mLocationInfo.mHost.Assign(mLocationInfo.mHostname);
  }

  nsContentUtils::GetUTFOrigin(aBaseURI, mLocationInfo.mOrigin);
}

template <class Derived>
nsresult
WorkerPrivateParent<Derived>::SetPrincipalOnMainThread(nsIPrincipal* aPrincipal,
                                                       nsILoadGroup* aLoadGroup)
{
  return mLoadInfo.SetPrincipalOnMainThread(aPrincipal, aLoadGroup);
}

template <class Derived>
nsresult
WorkerPrivateParent<Derived>::SetPrincipalFromChannel(nsIChannel* aChannel)
{
  return mLoadInfo.SetPrincipalFromChannel(aChannel);
}

#if defined(DEBUG) || !defined(RELEASE_OR_BETA)
template <class Derived>
bool
WorkerPrivateParent<Derived>::FinalChannelPrincipalIsValid(nsIChannel* aChannel)
{
  return mLoadInfo.FinalChannelPrincipalIsValid(aChannel);
}

template <class Derived>
bool
WorkerPrivateParent<Derived>::PrincipalURIMatchesScriptURL()
{
  return mLoadInfo.PrincipalURIMatchesScriptURL();
}
#endif

template <class Derived>
void
WorkerPrivateParent<Derived>::UpdateOverridenLoadGroup(nsILoadGroup* aBaseLoadGroup)
{
  AssertIsOnMainThread();

  // The load group should have been overriden at init time.
  mLoadInfo.mInterfaceRequestor->MaybeAddTabChild(aBaseLoadGroup);
}

template <class Derived>
void
WorkerPrivateParent<Derived>::FlushReportsToSharedWorkers(
                                           nsIConsoleReportCollector* aReporter)
{
  AssertIsOnMainThread();

  AutoTArray<RefPtr<SharedWorker>, 10> sharedWorkers;
  AutoTArray<WindowAction, 10> windowActions;
  GetAllSharedWorkers(sharedWorkers);

  // First find out all the shared workers' window.
  for (size_t index = 0; index < sharedWorkers.Length(); index++) {
    RefPtr<SharedWorker>& sharedWorker = sharedWorkers[index];

    // May be null.
    nsPIDOMWindowInner* window = sharedWorker->GetOwner();

    // Add the owning window to our list so that we will flush the reports later.
    if (window && !windowActions.Contains(window)) {
      windowActions.AppendElement(WindowAction(window));
    }
  }

  bool reportErrorToBrowserConsole = true;

  // Flush the reports.
  for (uint32_t index = 0; index < windowActions.Length(); index++) {
    WindowAction& windowAction = windowActions[index];

    aReporter->FlushReportsToConsole(
      windowAction.mWindow->WindowID(),
      nsIConsoleReportCollector::ReportAction::Save);
    reportErrorToBrowserConsole = false;
  }

  // Finally report to browser console if there is no any window or shared
  // worker.
  if (reportErrorToBrowserConsole) {
    aReporter->FlushReportsToConsole(0);
    return;
  }

  aReporter->ClearConsoleReports();
}

template <class Derived>
NS_IMPL_ADDREF_INHERITED(WorkerPrivateParent<Derived>, DOMEventTargetHelper)

template <class Derived>
NS_IMPL_RELEASE_INHERITED(WorkerPrivateParent<Derived>, DOMEventTargetHelper)

template <class Derived>
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(WorkerPrivateParent<Derived>)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

template <class Derived>
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(WorkerPrivateParent<Derived>,
                                                  DOMEventTargetHelper)
  tmp->AssertIsOnParentThread();

  // The WorkerPrivate::mSelfRef has a reference to itself, which is really
  // held by the worker thread.  We traverse this reference if and only if our
  // busy count is zero and we have not released the main thread reference.
  // We do not unlink it.  This allows the CC to break cycles involving the
  // WorkerPrivate and begin shutting it down (which does happen in unlink) but
  // ensures that the WorkerPrivate won't be deleted before we're done shutting
  // down the thread.

  if (!tmp->mBusyCount && !tmp->mMainThreadObjectsForgotten) {
    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSelfRef)
  }

  // The various strong references in LoadInfo are managed manually and cannot
  // be cycle collected.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

template <class Derived>
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(WorkerPrivateParent<Derived>,
                                                DOMEventTargetHelper)
  tmp->Terminate();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

template <class Derived>
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(WorkerPrivateParent<Derived>,
                                               DOMEventTargetHelper)
  tmp->AssertIsOnParentThread();
NS_IMPL_CYCLE_COLLECTION_TRACE_END

#ifdef DEBUG

template <class Derived>
void
WorkerPrivateParent<Derived>::AssertIsOnParentThread() const
{
  if (GetParent()) {
    GetParent()->AssertIsOnWorkerThread();
  }
  else {
    AssertIsOnMainThread();
  }
}

template <class Derived>
void
WorkerPrivateParent<Derived>::AssertInnerWindowIsCorrect() const
{
  AssertIsOnParentThread();

  // Only care about top level workers from windows.
  if (mParent || !mLoadInfo.mWindow) {
    return;
  }

  AssertIsOnMainThread();

  nsPIDOMWindowOuter* outer = mLoadInfo.mWindow->GetOuterWindow();
  NS_ASSERTION(outer && outer->GetCurrentInnerWindow() == mLoadInfo.mWindow,
               "Inner window no longer correct!");
}

#endif

#if defined(DEBUG) || !defined(RELEASE_OR_BETA)
template <class Derived>
bool
WorkerPrivateParent<Derived>::PrincipalIsValid() const
{
  return mLoadInfo.PrincipalIsValid();
}
#endif

class PostDebuggerMessageRunnable final : public Runnable
{
  WorkerDebugger *mDebugger;
  nsString mMessage;

public:
  PostDebuggerMessageRunnable(WorkerDebugger* aDebugger,
                              const nsAString& aMessage)
  : mDebugger(aDebugger),
    mMessage(aMessage)
  {
  }

private:
  ~PostDebuggerMessageRunnable()
  { }

  NS_IMETHOD
  Run() override
  {
    mDebugger->PostMessageToDebuggerOnMainThread(mMessage);

    return NS_OK;
  }
};

class ReportDebuggerErrorRunnable final : public Runnable
{
  WorkerDebugger *mDebugger;
  nsString mFilename;
  uint32_t mLineno;
  nsString mMessage;

public:
  ReportDebuggerErrorRunnable(WorkerDebugger* aDebugger,
                              const nsAString& aFilename, uint32_t aLineno,
                              const nsAString& aMessage)
  : mDebugger(aDebugger),
    mFilename(aFilename),
    mLineno(aLineno),
    mMessage(aMessage)
  {
  }

private:
  ~ReportDebuggerErrorRunnable()
  { }

  NS_IMETHOD
  Run() override
  {
    mDebugger->ReportErrorToDebuggerOnMainThread(mFilename, mLineno, mMessage);

    return NS_OK;
  }
};

WorkerDebugger::WorkerDebugger(WorkerPrivate* aWorkerPrivate)
: mWorkerPrivate(aWorkerPrivate),
  mIsInitialized(false)
{
  AssertIsOnMainThread();
}

WorkerDebugger::~WorkerDebugger()
{
  MOZ_ASSERT(!mWorkerPrivate);

  if (!NS_IsMainThread()) {
    for (size_t index = 0; index < mListeners.Length(); ++index) {
      NS_ReleaseOnMainThread(mListeners[index].forget());
    }
  }
}

NS_IMPL_ISUPPORTS(WorkerDebugger, nsIWorkerDebugger)

NS_IMETHODIMP
WorkerDebugger::GetIsClosed(bool* aResult)
{
  AssertIsOnMainThread();

  *aResult = !mWorkerPrivate;
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetIsChrome(bool* aResult)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  *aResult = mWorkerPrivate->IsChromeWorker();
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetIsInitialized(bool* aResult)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  *aResult = mIsInitialized;
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetParent(nsIWorkerDebugger** aResult)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  WorkerPrivate* parent = mWorkerPrivate->GetParent();
  if (!parent) {
    *aResult = nullptr;
    return NS_OK;
  }

  MOZ_ASSERT(mWorkerPrivate->IsDedicatedWorker());

  nsCOMPtr<nsIWorkerDebugger> debugger = parent->Debugger();
  debugger.forget(aResult);
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetType(uint32_t* aResult)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  *aResult = mWorkerPrivate->Type();
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetUrl(nsAString& aResult)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  aResult = mWorkerPrivate->ScriptURL();
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetWindow(mozIDOMWindow** aResult)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  if (mWorkerPrivate->GetParent() || !mWorkerPrivate->IsDedicatedWorker()) {
    *aResult = nullptr;
    return NS_OK;
  }

  nsCOMPtr<nsPIDOMWindowInner> window = mWorkerPrivate->GetWindow();
  window.forget(aResult);
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetPrincipal(nsIPrincipal** aResult)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(aResult);

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  nsCOMPtr<nsIPrincipal> prin = mWorkerPrivate->GetPrincipal();
  prin.forget(aResult);

  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::GetServiceWorkerID(uint32_t* aResult)
{
  AssertIsOnMainThread();
  MOZ_ASSERT(aResult);

  if (!mWorkerPrivate || !mWorkerPrivate->IsServiceWorker()) {
    return NS_ERROR_UNEXPECTED;
  }

  *aResult = mWorkerPrivate->ServiceWorkerID();
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::Initialize(const nsAString& aURL)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate) {
    return NS_ERROR_UNEXPECTED;
  }

  if (!mIsInitialized) {
    RefPtr<CompileDebuggerScriptRunnable> runnable =
      new CompileDebuggerScriptRunnable(mWorkerPrivate, aURL);
    if (!runnable->Dispatch()) {
      return NS_ERROR_FAILURE;
    }

    mIsInitialized = true;
  }

  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::PostMessageMoz(const nsAString& aMessage)
{
  AssertIsOnMainThread();

  if (!mWorkerPrivate || !mIsInitialized) {
    return NS_ERROR_UNEXPECTED;
  }

  RefPtr<DebuggerMessageEventRunnable> runnable =
    new DebuggerMessageEventRunnable(mWorkerPrivate, aMessage);
  if (!runnable->Dispatch()) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::AddListener(nsIWorkerDebuggerListener* aListener)
{
  AssertIsOnMainThread();

  if (mListeners.Contains(aListener)) {
    return NS_ERROR_INVALID_ARG;
  }

  mListeners.AppendElement(aListener);
  return NS_OK;
}

NS_IMETHODIMP
WorkerDebugger::RemoveListener(nsIWorkerDebuggerListener* aListener)
{
  AssertIsOnMainThread();

  if (!mListeners.Contains(aListener)) {
    return NS_ERROR_INVALID_ARG;
  }

  mListeners.RemoveElement(aListener);
  return NS_OK;
}

void
WorkerDebugger::Close()
{
  MOZ_ASSERT(mWorkerPrivate);
  mWorkerPrivate = nullptr;

  nsTArray<nsCOMPtr<nsIWorkerDebuggerListener>> listeners(mListeners);
  for (size_t index = 0; index < listeners.Length(); ++index) {
      listeners[index]->OnClose();
  }
}

void
WorkerDebugger::PostMessageToDebugger(const nsAString& aMessage)
{
  mWorkerPrivate->AssertIsOnWorkerThread();

  RefPtr<PostDebuggerMessageRunnable> runnable =
    new PostDebuggerMessageRunnable(this, aMessage);
  if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable.forget()))) {
    NS_WARNING("Failed to post message to debugger on main thread!");
  }
}

void
WorkerDebugger::PostMessageToDebuggerOnMainThread(const nsAString& aMessage)
{
  AssertIsOnMainThread();

  nsTArray<nsCOMPtr<nsIWorkerDebuggerListener>> listeners(mListeners);
  for (size_t index = 0; index < listeners.Length(); ++index) {
    listeners[index]->OnMessage(aMessage);
  }
}

void
WorkerDebugger::ReportErrorToDebugger(const nsAString& aFilename,
                                      uint32_t aLineno,
                                      const nsAString& aMessage)
{
  mWorkerPrivate->AssertIsOnWorkerThread();

  RefPtr<ReportDebuggerErrorRunnable> runnable =
    new ReportDebuggerErrorRunnable(this, aFilename, aLineno, aMessage);
  if (NS_FAILED(mWorkerPrivate->DispatchToMainThread(runnable.forget()))) {
    NS_WARNING("Failed to report error to debugger on main thread!");
  }
}

void
WorkerDebugger::ReportErrorToDebuggerOnMainThread(const nsAString& aFilename,
                                                  uint32_t aLineno,
                                                  const nsAString& aMessage)
{
  AssertIsOnMainThread();

  nsTArray<nsCOMPtr<nsIWorkerDebuggerListener>> listeners(mListeners);
  for (size_t index = 0; index < listeners.Length(); ++index) {
    listeners[index]->OnError(aFilename, aLineno, aMessage);
  }

  WorkerErrorReport report;
  report.mMessage = aMessage;
  report.mFilename = aFilename;
  LogErrorToConsole(report, 0);
}

WorkerPrivate::WorkerPrivate(WorkerPrivate* aParent,
                             const nsAString& aScriptURL,
                             bool aIsChromeWorker, WorkerType aWorkerType,
                             const nsAString& aWorkerName,
                             const nsACString& aServiceWorkerScope,
                             WorkerLoadInfo& aLoadInfo)
  : WorkerPrivateParent<WorkerPrivate>(aParent, aScriptURL,
                                       aIsChromeWorker, aWorkerType,
                                       aWorkerName, aServiceWorkerScope,
                                       aLoadInfo)
  , mDebuggerRegistered(false)
  , mDebugger(nullptr)
  , mJSContext(nullptr)
  , mPRThread(nullptr)
  , mNumHoldersPreventingShutdownStart(0)
  , mDebuggerEventLoopLevel(0)
  , mMainThreadEventTarget(do_GetMainThread())
  , mWorkerControlEventTarget(new WorkerControlEventTarget(this))
  , mErrorHandlerRecursionCount(0)
  , mNextTimeoutId(1)
  , mStatus(Pending)
  , mFrozen(false)
  , mTimerRunning(false)
  , mRunningExpiredTimeouts(false)
  , mPendingEventQueueClearing(false)
  , mCancelAllPendingRunnables(false)
  , mPeriodicGCTimerRunning(false)
  , mIdleGCTimerRunning(false)
  , mWorkerScriptExecutedSuccessfully(false)
  , mFetchHandlerWasAdded(false)
  , mOnLine(false)
{
  if (aParent) {
    aParent->AssertIsOnWorkerThread();
    aParent->GetAllPreferences(mPreferences);
    mOnLine = aParent->OnLine();
  }
  else {
    AssertIsOnMainThread();
    RuntimeService::GetDefaultPreferences(mPreferences);
    mOnLine = !NS_IsOffline();
  }

  nsCOMPtr<nsIEventTarget> target;

  // A child worker just inherits the parent workers ThrottledEventQueue
  // and main thread target for now.  This is mainly due to the restriction
  // that ThrottledEventQueue can only be created on the main thread at the
  // moment.
  if (aParent) {
    mMainThreadThrottledEventQueue = aParent->mMainThreadThrottledEventQueue;
    mMainThreadEventTarget = aParent->mMainThreadEventTarget;
    return;
  }

  MOZ_ASSERT(NS_IsMainThread());
  target = GetWindow() ? GetWindow()->EventTargetFor(TaskCategory::Worker) : nullptr;

  if (!target) {
    nsCOMPtr<nsIThread> mainThread;
    NS_GetMainThread(getter_AddRefs(mainThread));
    MOZ_DIAGNOSTIC_ASSERT(mainThread);
    target = mainThread;
  }

  // Throttle events to the main thread using a ThrottledEventQueue specific to
  // this worker thread.  This may return nullptr during shutdown.
  mMainThreadThrottledEventQueue = ThrottledEventQueue::Create(target);

  // If we were able to creat the throttled event queue, then use it for
  // dispatching our main thread runnables.  Otherwise use our underlying
  // base target.
  if (mMainThreadThrottledEventQueue) {
    mMainThreadEventTarget = mMainThreadThrottledEventQueue;
  } else {
    mMainThreadEventTarget = target.forget();
  }
}

WorkerPrivate::~WorkerPrivate()
{
  mWorkerControlEventTarget->ForgetWorkerPrivate(this);
}

// static
already_AddRefed<WorkerPrivate>
WorkerPrivate::Constructor(const GlobalObject& aGlobal,
                           const nsAString& aScriptURL,
                           const WorkerOptions& aOptions,
                           ErrorResult& aRv)
{
  return WorkerPrivate::Constructor(aGlobal, aScriptURL, false,
                                    WorkerTypeDedicated,
                                    aOptions.mName, nullptr, aRv);
}

// static
bool
WorkerPrivate::WorkerAvailable(JSContext* aCx, JSObject* /* unused */)
{
  // If we're already on a worker workers are clearly enabled.
  if (!NS_IsMainThread()) {
    return true;
  }

  // If our caller is chrome, workers are always available.
  if (nsContentUtils::IsSystemCaller(aCx)) {
    return true;
  }

  // Else check the pref.
  return Preferences::GetBool(PREF_WORKERS_ENABLED);
}

// static
already_AddRefed<ChromeWorkerPrivate>
ChromeWorkerPrivate::Constructor(const GlobalObject& aGlobal,
                                 const nsAString& aScriptURL,
                                 ErrorResult& aRv)
{
  return WorkerPrivate::Constructor(aGlobal, aScriptURL, true,
                                    WorkerTypeDedicated, EmptyString(),
                                    nullptr, aRv)
                                    .downcast<ChromeWorkerPrivate>();
}

// static
bool
ChromeWorkerPrivate::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();
}

// static
already_AddRefed<WorkerPrivate>
WorkerPrivate::Constructor(const GlobalObject& aGlobal,
                           const nsAString& aScriptURL,
                           bool aIsChromeWorker, WorkerType aWorkerType,
                           const nsAString& aWorkerName,
                           WorkerLoadInfo* aLoadInfo, ErrorResult& aRv)
{
  JSContext* cx = aGlobal.Context();
  return Constructor(cx, aScriptURL, aIsChromeWorker, aWorkerType,
                     aWorkerName, NullCString(), aLoadInfo, aRv);
}

// static
already_AddRefed<WorkerPrivate>
WorkerPrivate::Constructor(JSContext* aCx,
                           const nsAString& aScriptURL,
                           bool aIsChromeWorker, WorkerType aWorkerType,
                           const nsAString& aWorkerName,
                           const nsACString& aServiceWorkerScope,
                           WorkerLoadInfo* aLoadInfo, ErrorResult& aRv)
{
  WorkerPrivate* parent = NS_IsMainThread() ?
                          nullptr :
                          GetCurrentThreadWorkerPrivate();
  if (parent) {
    parent->AssertIsOnWorkerThread();
  } else {
    AssertIsOnMainThread();
  }

  Maybe<WorkerLoadInfo> stackLoadInfo;
  if (!aLoadInfo) {
    stackLoadInfo.emplace();

    nsresult rv = GetLoadInfo(aCx, nullptr, parent, aScriptURL,
                              aIsChromeWorker, InheritLoadGroup,
                              aWorkerType, stackLoadInfo.ptr());
    aRv.MightThrowJSException();
    if (NS_FAILED(rv)) {
      scriptloader::ReportLoadError(aRv, rv, aScriptURL);
      return nullptr;
    }

    aLoadInfo = stackLoadInfo.ptr();
  }

  // NB: This has to be done before creating the WorkerPrivate, because it will
  // attempt to use static variables that are initialized in the RuntimeService
  // constructor.
  RuntimeService* runtimeService;

  if (!parent) {
    runtimeService = RuntimeService::GetOrCreateService();
    if (!runtimeService) {
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
    }
  }
  else {
    runtimeService = RuntimeService::GetService();
  }

  MOZ_ASSERT(runtimeService);

  RefPtr<WorkerPrivate> worker =
    new WorkerPrivate(parent, aScriptURL, aIsChromeWorker,
                      aWorkerType, aWorkerName, aServiceWorkerScope,
                      *aLoadInfo);

  // Gecko contexts always have an explicitly-set default locale (set by
  // XPJSRuntime::Initialize for the main thread, set by
  // WorkerThreadPrimaryRunnable::Run for workers just before running worker
  // code), so this is never SpiderMonkey's builtin default locale.
  JS::UniqueChars defaultLocale = JS_GetDefaultLocale(aCx);
  if (NS_WARN_IF(!defaultLocale)) {
    aRv.Throw(NS_ERROR_UNEXPECTED);
    return nullptr;
  }

  worker->mDefaultLocale = Move(defaultLocale);

  if (!runtimeService->RegisterWorker(worker)) {
    aRv.Throw(NS_ERROR_UNEXPECTED);
    return nullptr;
  }

  worker->EnableDebugger();

  MOZ_DIAGNOSTIC_ASSERT(worker->PrincipalIsValid());

  RefPtr<CompileScriptRunnable> compiler =
    new CompileScriptRunnable(worker, aScriptURL);
  if (!compiler->Dispatch()) {
    aRv.Throw(NS_ERROR_UNEXPECTED);
    return nullptr;
  }

  worker->mSelfRef = worker;

  return worker.forget();
}

// static
nsresult
WorkerPrivate::GetLoadInfo(JSContext* aCx, nsPIDOMWindowInner* aWindow,
                           WorkerPrivate* aParent, const nsAString& aScriptURL,
                           bool aIsChromeWorker,
                           LoadGroupBehavior aLoadGroupBehavior,
                           WorkerType aWorkerType,
                           WorkerLoadInfo* aLoadInfo)
{
  using namespace mozilla::dom::workers::scriptloader;

  MOZ_ASSERT(aCx);
  MOZ_ASSERT_IF(NS_IsMainThread(), aCx == nsContentUtils::GetCurrentJSContext());

  if (aWindow) {
    AssertIsOnMainThread();
  }

  WorkerLoadInfo loadInfo;
  nsresult rv;

  if (aParent) {
    aParent->AssertIsOnWorkerThread();

    // If the parent is going away give up now.
    Status parentStatus;
    {
      MutexAutoLock lock(aParent->mMutex);
      parentStatus = aParent->mStatus;
    }

    if (parentStatus > Running) {
      return NS_ERROR_FAILURE;
    }

    // Passing a pointer to our stack loadInfo is safe here because this
    // method uses a sync runnable to get the channel from the main thread.
    rv = ChannelFromScriptURLWorkerThread(aCx, aParent, aScriptURL,
                                          loadInfo);
    if (NS_FAILED(rv)) {
      MOZ_ALWAYS_TRUE(loadInfo.ProxyReleaseMainThreadObjects(aParent));
      return rv;
    }

    // Now that we've spun the loop there's no guarantee that our parent is
    // still alive.  We may have received control messages initiating shutdown.
    {
      MutexAutoLock lock(aParent->mMutex);
      parentStatus = aParent->mStatus;
    }

    if (parentStatus > Running) {
      MOZ_ALWAYS_TRUE(loadInfo.ProxyReleaseMainThreadObjects(aParent));
      return NS_ERROR_FAILURE;
    }

    loadInfo.mDomain = aParent->Domain();
    loadInfo.mFromWindow = aParent->IsFromWindow();
    loadInfo.mWindowID = aParent->WindowID();
    loadInfo.mStorageAllowed = aParent->IsStorageAllowed();
    loadInfo.mOriginAttributes = aParent->GetOriginAttributes();
    loadInfo.mServiceWorkersTestingInWindow =
      aParent->ServiceWorkersTestingInWindow();
  } else {
    AssertIsOnMainThread();

    // Make sure that the IndexedDatabaseManager is set up
    Unused << NS_WARN_IF(!IndexedDatabaseManager::GetOrCreate());

    nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
    MOZ_ASSERT(ssm);

    bool isChrome = nsContentUtils::IsSystemCaller(aCx);

    // First check to make sure the caller has permission to make a privileged
    // worker if they called the ChromeWorker/ChromeSharedWorker constructor.
    if (aIsChromeWorker && !isChrome) {
      return NS_ERROR_DOM_SECURITY_ERR;
    }

    // Chrome callers (whether creating a ChromeWorker or Worker) always get the
    // system principal here as they're allowed to load anything. The script
    // loader will refuse to run any script that does not also have the system
    // principal.
    if (isChrome) {
      rv = ssm->GetSystemPrincipal(getter_AddRefs(loadInfo.mPrincipal));
      NS_ENSURE_SUCCESS(rv, rv);

      loadInfo.mPrincipalIsSystem = true;
    }

    // See if we're being called from a window.
    nsCOMPtr<nsPIDOMWindowInner> globalWindow = aWindow;
    if (!globalWindow) {
      nsCOMPtr<nsIScriptGlobalObject> scriptGlobal =
        nsJSUtils::GetStaticScriptGlobal(JS::CurrentGlobalOrNull(aCx));
      if (scriptGlobal) {
        globalWindow = do_QueryInterface(scriptGlobal);
        MOZ_ASSERT(globalWindow);
      }
    }

    nsCOMPtr<nsIDocument> document;

    if (globalWindow) {
      // Only use the current inner window, and only use it if the caller can
      // access it.
      if (nsPIDOMWindowOuter* outerWindow = globalWindow->GetOuterWindow()) {
        loadInfo.mWindow = outerWindow->GetCurrentInnerWindow();
        // TODO: fix this for SharedWorkers with multiple documents (bug 1177935)
        loadInfo.mServiceWorkersTestingInWindow =
          outerWindow->GetServiceWorkersTestingEnabled();
      }

      if (!loadInfo.mWindow ||
          (globalWindow != loadInfo.mWindow &&
            !nsContentUtils::CanCallerAccess(loadInfo.mWindow))) {
        return NS_ERROR_DOM_SECURITY_ERR;
      }

      nsCOMPtr<nsIScriptGlobalObject> sgo = do_QueryInterface(loadInfo.mWindow);
      MOZ_ASSERT(sgo);

      loadInfo.mScriptContext = sgo->GetContext();
      NS_ENSURE_TRUE(loadInfo.mScriptContext, NS_ERROR_FAILURE);

      // If we're called from a window then we can dig out the principal and URI
      // from the document.
      document = loadInfo.mWindow->GetExtantDoc();
      NS_ENSURE_TRUE(document, NS_ERROR_FAILURE);

      loadInfo.mBaseURI = document->GetDocBaseURI();
      loadInfo.mLoadGroup = document->GetDocumentLoadGroup();
      NS_ENSURE_TRUE(loadInfo.mLoadGroup, NS_ERROR_FAILURE);

      // Use the document's NodePrincipal as our principal if we're not being
      // called from chrome.
      if (!loadInfo.mPrincipal) {
        loadInfo.mPrincipal = document->NodePrincipal();
        NS_ENSURE_TRUE(loadInfo.mPrincipal, NS_ERROR_FAILURE);

        // We use the document's base domain to limit the number of workers
        // each domain can create. For sandboxed documents, we use the domain
        // of their first non-sandboxed document, walking up until we find
        // one. If we can't find one, we fall back to using the GUID of the
        // null principal as the base domain.
        if (document->GetSandboxFlags() & SANDBOXED_ORIGIN) {
          nsCOMPtr<nsIDocument> tmpDoc = document;
          do {
            tmpDoc = tmpDoc->GetParentDocument();
          } while (tmpDoc && tmpDoc->GetSandboxFlags() & SANDBOXED_ORIGIN);

          if (tmpDoc) {
            // There was an unsandboxed ancestor, yay!
            nsCOMPtr<nsIPrincipal> tmpPrincipal = tmpDoc->NodePrincipal();
            rv = tmpPrincipal->GetBaseDomain(loadInfo.mDomain);
            NS_ENSURE_SUCCESS(rv, rv);
          } else {
            // No unsandboxed ancestor, use our GUID.
            rv = loadInfo.mPrincipal->GetBaseDomain(loadInfo.mDomain);
            NS_ENSURE_SUCCESS(rv, rv);
          }
        } else {
          // Document creating the worker is not sandboxed.
          rv = loadInfo.mPrincipal->GetBaseDomain(loadInfo.mDomain);
          NS_ENSURE_SUCCESS(rv, rv);
        }
      }

      NS_ENSURE_TRUE(NS_LoadGroupMatchesPrincipal(loadInfo.mLoadGroup,
                                                  loadInfo.mPrincipal),
                     NS_ERROR_FAILURE);

      nsCOMPtr<nsIPermissionManager> permMgr =
        do_GetService(NS_PERMISSIONMANAGER_CONTRACTID, &rv);
      NS_ENSURE_SUCCESS(rv, rv);

      uint32_t perm;
      rv = permMgr->TestPermissionFromPrincipal(loadInfo.mPrincipal, "systemXHR",
                                                &perm);
      NS_ENSURE_SUCCESS(rv, rv);

      loadInfo.mXHRParamsAllowed = perm == nsIPermissionManager::ALLOW_ACTION;

      loadInfo.mFromWindow = true;
      loadInfo.mWindowID = globalWindow->WindowID();
      nsContentUtils::StorageAccess access =
        nsContentUtils::StorageAllowedForWindow(globalWindow);
      loadInfo.mStorageAllowed = access > nsContentUtils::StorageAccess::eDeny;
      loadInfo.mOriginAttributes = nsContentUtils::GetOriginAttributes(document);
    } else {
      // Not a window
      MOZ_ASSERT(isChrome);

      // We're being created outside of a window. Need to figure out the script
      // that is creating us in order for us to use relative URIs later on.
      JS::AutoFilename fileName;
      if (JS::DescribeScriptedCaller(aCx, &fileName)) {
        // In most cases, fileName is URI. In a few other cases
        // (e.g. xpcshell), fileName is a file path. Ideally, we would
        // prefer testing whether fileName parses as an URI and fallback
        // to file path in case of error, but Windows file paths have
        // the interesting property that they can be parsed as bogus
        // URIs (e.g. C:/Windows/Tmp is interpreted as scheme "C",
        // hostname "Windows", path "Tmp"), which defeats this algorithm.
        // Therefore, we adopt the opposite convention.
        nsCOMPtr<nsIFile> scriptFile =
          do_CreateInstance("@mozilla.org/file/local;1", &rv);
        if (NS_FAILED(rv)) {
          return rv;
        }

        rv = scriptFile->InitWithPath(NS_ConvertUTF8toUTF16(fileName.get()));
        if (NS_SUCCEEDED(rv)) {
          rv = NS_NewFileURI(getter_AddRefs(loadInfo.mBaseURI),
                             scriptFile);
        }
        if (NS_FAILED(rv)) {
          // As expected, fileName is not a path, so proceed with
          // a uri.
          rv = NS_NewURI(getter_AddRefs(loadInfo.mBaseURI),
                         fileName.get());
        }
        if (NS_FAILED(rv)) {
          return rv;
        }
      }
      loadInfo.mXHRParamsAllowed = true;
      loadInfo.mFromWindow = false;
      loadInfo.mWindowID = UINT64_MAX;
      loadInfo.mStorageAllowed = true;
      loadInfo.mOriginAttributes = OriginAttributes();
    }

    MOZ_ASSERT(loadInfo.mPrincipal);
    MOZ_ASSERT(isChrome || !loadInfo.mDomain.IsEmpty());

    if (!loadInfo.mLoadGroup || aLoadGroupBehavior == OverrideLoadGroup) {
      OverrideLoadInfoLoadGroup(loadInfo);
    }
    MOZ_ASSERT(NS_LoadGroupMatchesPrincipal(loadInfo.mLoadGroup,
                                            loadInfo.mPrincipal));

    // Top level workers' main script use the document charset for the script
    // uri encoding.
    bool useDefaultEncoding = false;
    rv = ChannelFromScriptURLMainThread(loadInfo.mPrincipal, loadInfo.mBaseURI,
                                        document, loadInfo.mLoadGroup,
                                        aScriptURL,
                                        ContentPolicyType(aWorkerType),
                                        useDefaultEncoding,
                                        getter_AddRefs(loadInfo.mChannel));
    NS_ENSURE_SUCCESS(rv, rv);

    rv = NS_GetFinalChannelURI(loadInfo.mChannel,
                               getter_AddRefs(loadInfo.mResolvedScriptURI));
    NS_ENSURE_SUCCESS(rv, rv);

    rv = loadInfo.SetPrincipalFromChannel(loadInfo.mChannel);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  MOZ_DIAGNOSTIC_ASSERT(loadInfo.PrincipalIsValid());

  aLoadInfo->StealFrom(loadInfo);
  return NS_OK;
}

// static
void
WorkerPrivate::OverrideLoadInfoLoadGroup(WorkerLoadInfo& aLoadInfo)
{
  MOZ_ASSERT(!aLoadInfo.mInterfaceRequestor);

  aLoadInfo.mInterfaceRequestor =
    new WorkerLoadInfo::InterfaceRequestor(aLoadInfo.mPrincipal,
                                           aLoadInfo.mLoadGroup);
  aLoadInfo.mInterfaceRequestor->MaybeAddTabChild(aLoadInfo.mLoadGroup);

  // NOTE: this defaults the load context to:
  //  - private browsing = false
  //  - content = true
  //  - use remote tabs = false
  nsCOMPtr<nsILoadGroup> loadGroup =
    do_CreateInstance(NS_LOADGROUP_CONTRACTID);

  nsresult rv =
    loadGroup->SetNotificationCallbacks(aLoadInfo.mInterfaceRequestor);
  MOZ_ALWAYS_SUCCEEDS(rv);

  aLoadInfo.mLoadGroup = loadGroup.forget();

  MOZ_ASSERT(NS_LoadGroupMatchesPrincipal(aLoadInfo.mLoadGroup,
                                          aLoadInfo.mPrincipal));
}

void
WorkerPrivate::DoRunLoop(JSContext* aCx)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(mThread);

  {
    MutexAutoLock lock(mMutex);
    mJSContext = aCx;

    MOZ_ASSERT(mStatus == Pending);
    mStatus = Running;
  }

  // Now that we've done that, we can go ahead and set up our AutoJSAPI.  We
  // can't before this point, because it can't find the right JSContext before
  // then, since it gets it from our mJSContext.
  AutoJSAPI jsapi;
  jsapi.Init();
  MOZ_ASSERT(jsapi.cx() == aCx);

  EnableMemoryReporter();

  InitializeGCTimers();

  Maybe<JSAutoCompartment> workerCompartment;

  for (;;) {
    Status currentStatus, previousStatus;
    bool debuggerRunnablesPending = false;
    bool normalRunnablesPending = false;

    {
      MutexAutoLock lock(mMutex);
      previousStatus = mStatus;

      while (mControlQueue.IsEmpty() &&
             !(debuggerRunnablesPending = !mDebuggerQueue.IsEmpty()) &&
             !(normalRunnablesPending = NS_HasPendingEvents(mThread))) {
        WaitForWorkerEvents();
      }

      auto result = ProcessAllControlRunnablesLocked();
      if (result != ProcessAllControlRunnablesResult::Nothing) {
        // NB: There's no JS on the stack here, so Abort vs MayContinue is
        // irrelevant

        // The state of the world may have changed, recheck it.
        normalRunnablesPending = NS_HasPendingEvents(mThread);
        // The debugger queue doesn't get cleared, so we can ignore that.
      }

      currentStatus = mStatus;
    }

    // if all holders are done then we can kill this thread.
    if (currentStatus != Running && !HasActiveHolders()) {

      // If we just changed status, we must schedule the current runnables.
      if (previousStatus != Running && currentStatus != Killing) {
        NotifyInternal(aCx, Killing);
        MOZ_ASSERT(!JS_IsExceptionPending(aCx));

#ifdef DEBUG
        {
          MutexAutoLock lock(mMutex);
          currentStatus = mStatus;
        }
        MOZ_ASSERT(currentStatus == Killing);
#else
        currentStatus = Killing;
#endif
      }

      // If we're supposed to die then we should exit the loop.
      if (currentStatus == Killing) {
        // Flush uncaught rejections immediately, without
        // waiting for a next tick.
        PromiseDebugging::FlushUncaughtRejections();

        ShutdownGCTimers();

        DisableMemoryReporter();

        {
          MutexAutoLock lock(mMutex);

          mStatus = Dead;
          mJSContext = nullptr;
        }

        // After mStatus is set to Dead there can be no more
        // WorkerControlRunnables so no need to lock here.
        if (!mControlQueue.IsEmpty()) {
          WorkerControlRunnable* runnable;
          while (mControlQueue.Pop(runnable)) {
            runnable->Cancel();
            runnable->Release();
          }
        }

        // Unroot the globals
        mScope = nullptr;
        mDebuggerScope = nullptr;

        return;
      }
    }

    if (debuggerRunnablesPending || normalRunnablesPending) {
      // Start the periodic GC timer if it is not already running.
      SetGCTimerMode(PeriodicTimer);
    }

    if (debuggerRunnablesPending) {
      WorkerRunnable* runnable;

      {
        MutexAutoLock lock(mMutex);

        mDebuggerQueue.Pop(runnable);
        debuggerRunnablesPending = !mDebuggerQueue.IsEmpty();
      }

      MOZ_ASSERT(runnable);
      static_cast<nsIRunnable*>(runnable)->Run();
      runnable->Release();

      // Flush the promise queue.
      Promise::PerformWorkerDebuggerMicroTaskCheckpoint();

      if (debuggerRunnablesPending) {
        WorkerDebuggerGlobalScope* globalScope = DebuggerGlobalScope();
        MOZ_ASSERT(globalScope);

        // Now *might* be a good time to GC. Let the JS engine make the decision.
        JSAutoCompartment ac(aCx, globalScope->GetGlobalJSObject());
        JS_MaybeGC(aCx);
      }
    } else if (normalRunnablesPending) {
      // Process a single runnable from the main queue.
      NS_ProcessNextEvent(mThread, false);

      normalRunnablesPending = NS_HasPendingEvents(mThread);
      if (normalRunnablesPending && GlobalScope()) {
        // Now *might* be a good time to GC. Let the JS engine make the decision.
        JSAutoCompartment ac(aCx, GlobalScope()->GetGlobalJSObject());
        JS_MaybeGC(aCx);
      }
    }

    if (!debuggerRunnablesPending && !normalRunnablesPending) {
      // Both the debugger event queue and the normal event queue has been
      // exhausted, cancel the periodic GC timer and schedule the idle GC timer.
      SetGCTimerMode(IdleTimer);
    }

    // If the worker thread is spamming the main thread faster than it can
    // process the work, then pause the worker thread until the MT catches
    // up.
    if (mMainThreadThrottledEventQueue &&
        mMainThreadThrottledEventQueue->Length() > 5000) {
      mMainThreadThrottledEventQueue->AwaitIdle();
    }
  }

  MOZ_CRASH("Shouldn't get here!");
}

void
WorkerPrivate::OnProcessNextEvent()
{
  AssertIsOnWorkerThread();

  uint32_t recursionDepth = CycleCollectedJSContext::Get()->RecursionDepth();
  MOZ_ASSERT(recursionDepth);

  // Normally we process control runnables in DoRunLoop or RunCurrentSyncLoop.
  // However, it's possible that non-worker C++ could spin its own nested event
  // loop, and in that case we must ensure that we continue to process control
  // runnables here.
  if (recursionDepth > 1 &&
      mSyncLoopStack.Length() < recursionDepth - 1) {
    Unused << ProcessAllControlRunnables();
    // There's no running JS, and no state to revalidate, so we can ignore the
    // return value.
  }
}

void
WorkerPrivate::AfterProcessNextEvent()
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(CycleCollectedJSContext::Get()->RecursionDepth());
}

void
WorkerPrivate::MaybeDispatchLoadFailedRunnable()
{
  AssertIsOnWorkerThread();

  nsCOMPtr<nsIRunnable> runnable = StealLoadFailedAsyncRunnable();
  if (!runnable) {
    return;
  }

  MOZ_ALWAYS_SUCCEEDS(DispatchToMainThread(runnable.forget()));
}

nsIEventTarget*
WorkerPrivate::MainThreadEventTarget()
{
  return mMainThreadEventTarget;
}

nsresult
WorkerPrivate::DispatchToMainThread(nsIRunnable* aRunnable, uint32_t aFlags)
{
  nsCOMPtr<nsIRunnable> r = aRunnable;
  return DispatchToMainThread(r.forget(), aFlags);
}

nsresult
WorkerPrivate::DispatchToMainThread(already_AddRefed<nsIRunnable> aRunnable,
                                    uint32_t aFlags)
{
  nsCOMPtr<nsIRunnable> runnable = aRunnable;
  if (nsCOMPtr<nsINamed> named = do_QueryInterface(runnable)) {
    named->SetName("WorkerRunnable");
  }
  return mMainThreadEventTarget->Dispatch(runnable.forget(), aFlags);
}

nsIEventTarget*
WorkerPrivate::ControlEventTarget()
{
  return mWorkerControlEventTarget;
}

void
WorkerPrivate::InitializeGCTimers()
{
  AssertIsOnWorkerThread();

  // We need a timer for GC. The basic plan is to run a non-shrinking GC
  // periodically (PERIODIC_GC_TIMER_DELAY_SEC) while the worker is running.
  // Once the worker goes idle we set a short (IDLE_GC_TIMER_DELAY_SEC) timer to
  // run a shrinking GC. If the worker receives more messages then the short
  // timer is canceled and the periodic timer resumes.
  mGCTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
  MOZ_ASSERT(mGCTimer);

  mPeriodicGCTimerRunning = false;
  mIdleGCTimerRunning = false;
}

void
WorkerPrivate::SetGCTimerMode(GCTimerMode aMode)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(mGCTimer);

  if ((aMode == PeriodicTimer && mPeriodicGCTimerRunning) ||
      (aMode == IdleTimer && mIdleGCTimerRunning)) {
    return;
  }

  MOZ_ALWAYS_SUCCEEDS(mGCTimer->Cancel());

  mPeriodicGCTimerRunning = false;
  mIdleGCTimerRunning = false;
  LOG(WorkerLog(),
      ("Worker %p canceled GC timer because %s\n", this,
       aMode == PeriodicTimer ?
       "periodic" :
       aMode == IdleTimer ? "idle" : "none"));

  if (aMode == NoTimer) {
    return;
  }

  MOZ_ASSERT(aMode == PeriodicTimer || aMode == IdleTimer);

  uint32_t delay = 0;
  int16_t type = nsITimer::TYPE_ONE_SHOT;
  nsTimerCallbackFunc callback = nullptr;
  const char* name = nullptr;

  if (aMode == PeriodicTimer) {
    delay = PERIODIC_GC_TIMER_DELAY_SEC * 1000;
    type = nsITimer::TYPE_REPEATING_SLACK;
    callback = PeriodicGCTimerCallback;
    name = "dom::workers::PeriodicGCTimerCallback";
  }
  else {
    delay = IDLE_GC_TIMER_DELAY_SEC * 1000;
    type = nsITimer::TYPE_ONE_SHOT;
    callback = IdleGCTimerCallback;
    name = "dom::workers::IdleGCTimerCallback";
  }

  MOZ_ALWAYS_SUCCEEDS(mGCTimer->SetTarget(mWorkerControlEventTarget));
  MOZ_ALWAYS_SUCCEEDS(
    mGCTimer->InitWithNamedFuncCallback(callback, this, delay, type, name));

  if (aMode == PeriodicTimer) {
    LOG(WorkerLog(), ("Worker %p scheduled periodic GC timer\n", this));
    mPeriodicGCTimerRunning = true;
  }
  else {
    LOG(WorkerLog(), ("Worker %p scheduled idle GC timer\n", this));
    mIdleGCTimerRunning = true;
  }
}

void
WorkerPrivate::ShutdownGCTimers()
{
  AssertIsOnWorkerThread();

  MOZ_ASSERT(mGCTimer);

  // Always make sure the timer is canceled.
  MOZ_ALWAYS_SUCCEEDS(mGCTimer->Cancel());

  LOG(WorkerLog(), ("Worker %p killed the GC timer\n", this));

  mGCTimer = nullptr;
  mPeriodicGCTimerRunning = false;
  mIdleGCTimerRunning = false;
}

bool
WorkerPrivate::InterruptCallback(JSContext* aCx)
{
  AssertIsOnWorkerThread();

  MOZ_ASSERT(!JS_IsExceptionPending(aCx));

  bool mayContinue = true;
  bool scheduledIdleGC = false;

  for (;;) {
    // Run all control events now.
    auto result = ProcessAllControlRunnables();
    if (result == ProcessAllControlRunnablesResult::Abort) {
      mayContinue = false;
    }

    bool mayFreeze = mFrozen;
    if (mayFreeze) {
      MutexAutoLock lock(mMutex);
      mayFreeze = mStatus <= Running;
    }

    if (!mayContinue || !mayFreeze) {
      break;
    }

    // Cancel the periodic GC timer here before freezing. The idle GC timer
    // will clean everything up once it runs.
    if (!scheduledIdleGC) {
      SetGCTimerMode(IdleTimer);
      scheduledIdleGC = true;
    }

    while ((mayContinue = MayContinueRunning())) {
      MutexAutoLock lock(mMutex);
      if (!mControlQueue.IsEmpty()) {
        break;
      }

      WaitForWorkerEvents(PR_MillisecondsToInterval(UINT32_MAX));
    }
  }

  if (!mayContinue) {
    // We want only uncatchable exceptions here.
    NS_ASSERTION(!JS_IsExceptionPending(aCx),
                 "Should not have an exception set here!");
    return false;
  }

  // Make sure the periodic timer gets turned back on here.
  SetGCTimerMode(PeriodicTimer);

  return true;
}

nsresult
WorkerPrivate::IsOnCurrentThread(bool* aIsOnCurrentThread)
{
  // May be called on any thread!

  MOZ_ASSERT(aIsOnCurrentThread);
  MOZ_ASSERT(mPRThread);

  *aIsOnCurrentThread = PR_GetCurrentThread() == mPRThread;
  return NS_OK;
}

void
WorkerPrivate::ScheduleDeletion(WorkerRanOrNot aRanOrNot)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(mChildWorkers.IsEmpty());
  MOZ_ASSERT(mSyncLoopStack.IsEmpty());
  MOZ_ASSERT(!mPendingEventQueueClearing);

  ClearMainEventQueue(aRanOrNot);
#ifdef DEBUG
  if (WorkerRan == aRanOrNot) {
    nsIThread* currentThread = NS_GetCurrentThread();
    MOZ_ASSERT(currentThread);
    MOZ_ASSERT(!NS_HasPendingEvents(currentThread));
  }
#endif

  if (WorkerPrivate* parent = GetParent()) {
    RefPtr<WorkerFinishedRunnable> runnable =
      new WorkerFinishedRunnable(parent, this);
    if (!runnable->Dispatch()) {
      NS_WARNING("Failed to dispatch runnable!");
    }
  }
  else {
    RefPtr<TopLevelWorkerFinishedRunnable> runnable =
      new TopLevelWorkerFinishedRunnable(this);
    if (NS_FAILED(DispatchToMainThread(runnable.forget()))) {
      NS_WARNING("Failed to dispatch runnable!");
    }
  }
}

bool
WorkerPrivate::CollectRuntimeStats(JS::RuntimeStats* aRtStats,
                                   bool aAnonymize)
{
  AssertIsOnWorkerThread();
  NS_ASSERTION(aRtStats, "Null RuntimeStats!");
  NS_ASSERTION(mJSContext, "This must never be null!");

  return JS::CollectRuntimeStats(mJSContext, aRtStats, nullptr, aAnonymize);
}

void
WorkerPrivate::EnableMemoryReporter()
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(!mMemoryReporter);

  // No need to lock here since the main thread can't race until we've
  // successfully registered the reporter.
  mMemoryReporter = new MemoryReporter(this);

  if (NS_FAILED(RegisterWeakAsyncMemoryReporter(mMemoryReporter))) {
    NS_WARNING("Failed to register memory reporter!");
    // No need to lock here since a failed registration means our memory
    // reporter can't start running. Just clean up.
    mMemoryReporter = nullptr;
  }
}

void
WorkerPrivate::DisableMemoryReporter()
{
  AssertIsOnWorkerThread();

  RefPtr<MemoryReporter> memoryReporter;
  {
    // Mutex protectes MemoryReporter::mWorkerPrivate which is cleared by
    // MemoryReporter::Disable() below.
    MutexAutoLock lock(mMutex);

    // There is nothing to do here if the memory reporter was never successfully
    // registered.
    if (!mMemoryReporter) {
      return;
    }

    // We don't need this set any longer. Swap it out so that we can unregister
    // below.
    mMemoryReporter.swap(memoryReporter);

    // Next disable the memory reporter so that the main thread stops trying to
    // signal us.
    memoryReporter->Disable();
  }

  // Finally unregister the memory reporter.
  if (NS_FAILED(UnregisterWeakMemoryReporter(memoryReporter))) {
    NS_WARNING("Failed to unregister memory reporter!");
  }
}

void
WorkerPrivate::WaitForWorkerEvents(PRIntervalTime aInterval)
{
  AssertIsOnWorkerThread();
  mMutex.AssertCurrentThreadOwns();

  // Wait for a worker event.
  mCondVar.Wait(aInterval);
}

WorkerPrivate::ProcessAllControlRunnablesResult
WorkerPrivate::ProcessAllControlRunnablesLocked()
{
  AssertIsOnWorkerThread();
  mMutex.AssertCurrentThreadOwns();

  auto result = ProcessAllControlRunnablesResult::Nothing;

  for (;;) {
    WorkerControlRunnable* event;
    if (!mControlQueue.Pop(event)) {
      break;
    }

    MutexAutoUnlock unlock(mMutex);

    MOZ_ASSERT(event);
    if (NS_FAILED(static_cast<nsIRunnable*>(event)->Run())) {
      result = ProcessAllControlRunnablesResult::Abort;
    }

    if (result == ProcessAllControlRunnablesResult::Nothing) {
      // We ran at least one thing.
      result = ProcessAllControlRunnablesResult::MayContinue;
    }
    event->Release();
  }

  return result;
}

void
WorkerPrivate::ClearMainEventQueue(WorkerRanOrNot aRanOrNot)
{
  AssertIsOnWorkerThread();

  MOZ_ASSERT(mSyncLoopStack.IsEmpty());
  MOZ_ASSERT(!mCancelAllPendingRunnables);
  mCancelAllPendingRunnables = true;

  if (WorkerNeverRan == aRanOrNot) {
    for (uint32_t count = mPreStartRunnables.Length(), index = 0;
         index < count;
         index++) {
      RefPtr<WorkerRunnable> runnable = mPreStartRunnables[index].forget();
      static_cast<nsIRunnable*>(runnable.get())->Run();
    }
  } else {
    nsIThread* currentThread = NS_GetCurrentThread();
    MOZ_ASSERT(currentThread);

    NS_ProcessPendingEvents(currentThread);
  }

  MOZ_ASSERT(mCancelAllPendingRunnables);
  mCancelAllPendingRunnables = false;
}

void
WorkerPrivate::ClearDebuggerEventQueue()
{
  while (!mDebuggerQueue.IsEmpty()) {
    WorkerRunnable* runnable;
    mDebuggerQueue.Pop(runnable);
    // It should be ok to simply release the runnable, without running it.
    runnable->Release();
  }
}

bool
WorkerPrivate::FreezeInternal()
{
  AssertIsOnWorkerThread();

  NS_ASSERTION(!mFrozen, "Already frozen!");

  mFrozen = true;

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->Freeze(nullptr);
  }

  return true;
}

bool
WorkerPrivate::ThawInternal()
{
  AssertIsOnWorkerThread();

  NS_ASSERTION(mFrozen, "Not yet frozen!");

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->Thaw(nullptr);
  }

  mFrozen = false;
  return true;
}

void
WorkerPrivate::TraverseTimeouts(nsCycleCollectionTraversalCallback& cb)
{
  for (uint32_t i = 0; i < mTimeouts.Length(); ++i) {
    TimeoutInfo* tmp = mTimeouts[i];
    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHandler)
  }
}

void
WorkerPrivate::UnlinkTimeouts()
{
  mTimeouts.Clear();
}

bool
WorkerPrivate::ModifyBusyCountFromWorker(bool aIncrease)
{
  AssertIsOnWorkerThread();

  {
    MutexAutoLock lock(mMutex);

    // If we're in shutdown then the busy count is no longer being considered so
    // just return now.
    if (mStatus >= Killing) {
      return true;
    }
  }

  RefPtr<ModifyBusyCountRunnable> runnable =
    new ModifyBusyCountRunnable(this, aIncrease);
  return runnable->Dispatch();
}

bool
WorkerPrivate::AddChildWorker(ParentType* aChildWorker)
{
  AssertIsOnWorkerThread();

#ifdef DEBUG
  {
    Status currentStatus;
    {
      MutexAutoLock lock(mMutex);
      currentStatus = mStatus;
    }

    MOZ_ASSERT(currentStatus == Running);
  }
#endif

  NS_ASSERTION(!mChildWorkers.Contains(aChildWorker),
               "Already know about this one!");
  mChildWorkers.AppendElement(aChildWorker);

  return mChildWorkers.Length() == 1 ?
         ModifyBusyCountFromWorker(true) :
         true;
}

void
WorkerPrivate::RemoveChildWorker(ParentType* aChildWorker)
{
  AssertIsOnWorkerThread();

  NS_ASSERTION(mChildWorkers.Contains(aChildWorker),
               "Didn't know about this one!");
  mChildWorkers.RemoveElement(aChildWorker);

  if (mChildWorkers.IsEmpty() && !ModifyBusyCountFromWorker(false)) {
    NS_WARNING("Failed to modify busy count!");
  }
}

bool
WorkerPrivate::AddHolder(WorkerHolder* aHolder, Status aFailStatus)
{
  AssertIsOnWorkerThread();

  {
    MutexAutoLock lock(mMutex);

    if (mStatus >= aFailStatus) {
      return false;
    }
  }

  MOZ_ASSERT(!mHolders.Contains(aHolder), "Already know about this one!");

  if (aHolder->GetBehavior() == WorkerHolder::PreventIdleShutdownStart) {
    if (!mNumHoldersPreventingShutdownStart && !ModifyBusyCountFromWorker(true)) {
      return false;
    }
    mNumHoldersPreventingShutdownStart += 1;
  }

  mHolders.AppendElement(aHolder);
  return true;
}

void
WorkerPrivate::RemoveHolder(WorkerHolder* aHolder)
{
  AssertIsOnWorkerThread();

  MOZ_ASSERT(mHolders.Contains(aHolder), "Didn't know about this one!");
  mHolders.RemoveElement(aHolder);

  if (aHolder->GetBehavior() == WorkerHolder::PreventIdleShutdownStart) {
    mNumHoldersPreventingShutdownStart -= 1;
    if (!mNumHoldersPreventingShutdownStart && !ModifyBusyCountFromWorker(false)) {
      NS_WARNING("Failed to modify busy count!");
    }
  }
}

void
WorkerPrivate::NotifyHolders(JSContext* aCx, Status aStatus)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(!JS_IsExceptionPending(aCx));

  NS_ASSERTION(aStatus > Running, "Bad status!");

  if (aStatus >= Closing) {
    CancelAllTimeouts();
  }

  nsTObserverArray<WorkerHolder*>::ForwardIterator iter(mHolders);
  while (iter.HasMore()) {
    WorkerHolder* holder = iter.GetNext();
    if (!holder->Notify(aStatus)) {
      NS_WARNING("Failed to notify holder!");
    }
    MOZ_ASSERT(!JS_IsExceptionPending(aCx));
  }

  AutoTArray<ParentType*, 10> children;
  children.AppendElements(mChildWorkers);

  for (uint32_t index = 0; index < children.Length(); index++) {
    if (!children[index]->Notify(aStatus)) {
      NS_WARNING("Failed to notify child worker!");
    }
  }
}

void
WorkerPrivate::CancelAllTimeouts()
{
  AssertIsOnWorkerThread();

  LOG(TimeoutsLog(), ("Worker %p CancelAllTimeouts.\n", this));

  if (mTimerRunning) {
    NS_ASSERTION(mTimer && mTimerRunnable, "Huh?!");
    NS_ASSERTION(!mTimeouts.IsEmpty(), "Huh?!");

    if (NS_FAILED(mTimer->Cancel())) {
      NS_WARNING("Failed to cancel timer!");
    }

    for (uint32_t index = 0; index < mTimeouts.Length(); index++) {
      mTimeouts[index]->mCanceled = true;
    }

    // If mRunningExpiredTimeouts, then the fact that they are all canceled now
    // means that the currently executing RunExpiredTimeouts will deal with
    // them.  Otherwise, we need to clean them up ourselves.
    if (!mRunningExpiredTimeouts) {
      mTimeouts.Clear();
      ModifyBusyCountFromWorker(false);
    }

    // Set mTimerRunning false even if mRunningExpiredTimeouts is true, so that
    // if we get reentered under this same RunExpiredTimeouts call we don't
    // assert above that !mTimeouts().IsEmpty(), because that's clearly false
    // now.
    mTimerRunning = false;
  }
#ifdef DEBUG
  else if (!mRunningExpiredTimeouts) {
    NS_ASSERTION(mTimeouts.IsEmpty(), "Huh?!");
  }
#endif

  mTimer = nullptr;
  mTimerRunnable = nullptr;
}

already_AddRefed<nsIEventTarget>
WorkerPrivate::CreateNewSyncLoop(Status aFailStatus)
{
  AssertIsOnWorkerThread();

  {
    MutexAutoLock lock(mMutex);

    if (mStatus >= aFailStatus) {
      return nullptr;
    }
  }

  nsCOMPtr<nsIThreadInternal> thread = do_QueryInterface(NS_GetCurrentThread());
  MOZ_ASSERT(thread);

  nsCOMPtr<nsIEventTarget> realEventTarget;
  MOZ_ALWAYS_SUCCEEDS(thread->PushEventQueue(getter_AddRefs(realEventTarget)));

  RefPtr<EventTarget> workerEventTarget =
    new EventTarget(this, realEventTarget);

  {
    // Modifications must be protected by mMutex in DEBUG builds, see comment
    // about mSyncLoopStack in WorkerPrivate.h.
#ifdef DEBUG
    MutexAutoLock lock(mMutex);
#endif

    mSyncLoopStack.AppendElement(new SyncLoopInfo(workerEventTarget));
  }

  return workerEventTarget.forget();
}

bool
WorkerPrivate::RunCurrentSyncLoop()
{
  AssertIsOnWorkerThread();

  JSContext* cx = GetJSContext();
  MOZ_ASSERT(cx);

  // This should not change between now and the time we finish running this sync
  // loop.
  uint32_t currentLoopIndex = mSyncLoopStack.Length() - 1;

  SyncLoopInfo* loopInfo = mSyncLoopStack[currentLoopIndex];

  MOZ_ASSERT(loopInfo);
  MOZ_ASSERT(!loopInfo->mHasRun);
  MOZ_ASSERT(!loopInfo->mCompleted);

#ifdef DEBUG
  loopInfo->mHasRun = true;
#endif

  while (!loopInfo->mCompleted) {
    bool normalRunnablesPending = false;

    // Don't block with the periodic GC timer running.
    if (!NS_HasPendingEvents(mThread)) {
      SetGCTimerMode(IdleTimer);
    }

    // Wait for something to do.
    {
      MutexAutoLock lock(mMutex);

      for (;;) {
        while (mControlQueue.IsEmpty() &&
               !normalRunnablesPending &&
               !(normalRunnablesPending = NS_HasPendingEvents(mThread))) {
          WaitForWorkerEvents();
        }

        auto result = ProcessAllControlRunnablesLocked();
        if (result != ProcessAllControlRunnablesResult::Nothing) {
          // XXXkhuey how should we handle Abort here? See Bug 1003730.

          // The state of the world may have changed. Recheck it.
          normalRunnablesPending = NS_HasPendingEvents(mThread);

          // NB: If we processed a NotifyRunnable, we might have run
          // non-control runnables, one of which may have shut down the
          // sync loop.
          if (loopInfo->mCompleted) {
            break;
          }
        }

        // If we *didn't* run any control runnables, this should be unchanged.
        MOZ_ASSERT(!loopInfo->mCompleted);

        if (normalRunnablesPending) {
          break;
        }
      }
    }

    if (normalRunnablesPending) {
      // Make sure the periodic timer is running before we continue.
      SetGCTimerMode(PeriodicTimer);

      MOZ_ALWAYS_TRUE(NS_ProcessNextEvent(mThread, false));

      // Now *might* be a good time to GC. Let the JS engine make the decision.
      if (JS::CurrentGlobalOrNull(cx)) {
        JS_MaybeGC(cx);
      }
    }
  }

  // Make sure that the stack didn't change underneath us.
  MOZ_ASSERT(mSyncLoopStack[currentLoopIndex] == loopInfo);

  return DestroySyncLoop(currentLoopIndex);
}

bool
WorkerPrivate::DestroySyncLoop(uint32_t aLoopIndex, nsIThreadInternal* aThread)
{
  MOZ_ASSERT(!mSyncLoopStack.IsEmpty());
  MOZ_ASSERT(mSyncLoopStack.Length() - 1 == aLoopIndex);

  if (!aThread) {
    aThread = mThread;
  }

  // We're about to delete the loop, stash its event target and result.
  SyncLoopInfo* loopInfo = mSyncLoopStack[aLoopIndex];
  nsIEventTarget* nestedEventTarget =
    loopInfo->mEventTarget->GetWeakNestedEventTarget();
  MOZ_ASSERT(nestedEventTarget);

  bool result = loopInfo->mResult;

  {
    // Modifications must be protected by mMutex in DEBUG builds, see comment
    // about mSyncLoopStack in WorkerPrivate.h.
#ifdef DEBUG
    MutexAutoLock lock(mMutex);
#endif

    // This will delete |loopInfo|!
    mSyncLoopStack.RemoveElementAt(aLoopIndex);
  }

  MOZ_ALWAYS_SUCCEEDS(aThread->PopEventQueue(nestedEventTarget));

  if (mSyncLoopStack.IsEmpty() && mPendingEventQueueClearing) {
    mPendingEventQueueClearing = false;
    ClearMainEventQueue(WorkerRan);
  }

  return result;
}

void
WorkerPrivate::StopSyncLoop(nsIEventTarget* aSyncLoopTarget, bool aResult)
{
  AssertIsOnWorkerThread();
  AssertValidSyncLoop(aSyncLoopTarget);

  MOZ_ASSERT(!mSyncLoopStack.IsEmpty());

  for (uint32_t index = mSyncLoopStack.Length(); index > 0; index--) {
    nsAutoPtr<SyncLoopInfo>& loopInfo = mSyncLoopStack[index - 1];
    MOZ_ASSERT(loopInfo);
    MOZ_ASSERT(loopInfo->mEventTarget);

    if (loopInfo->mEventTarget == aSyncLoopTarget) {
      // Can't assert |loop->mHasRun| here because dispatch failures can cause
      // us to bail out early.
      MOZ_ASSERT(!loopInfo->mCompleted);

      loopInfo->mResult = aResult;
      loopInfo->mCompleted = true;

      loopInfo->mEventTarget->Disable();

      return;
    }

    MOZ_ASSERT(!SameCOMIdentity(loopInfo->mEventTarget, aSyncLoopTarget));
  }

  MOZ_CRASH("Unknown sync loop!");
}

#ifdef DEBUG
void
WorkerPrivate::AssertValidSyncLoop(nsIEventTarget* aSyncLoopTarget)
{
  MOZ_ASSERT(aSyncLoopTarget);

  EventTarget* workerTarget;
  nsresult rv =
    aSyncLoopTarget->QueryInterface(kDEBUGWorkerEventTargetIID,
                                    reinterpret_cast<void**>(&workerTarget));
  MOZ_ASSERT(NS_SUCCEEDED(rv));
  MOZ_ASSERT(workerTarget);

  bool valid = false;

  {
    MutexAutoLock lock(mMutex);

    for (uint32_t index = 0; index < mSyncLoopStack.Length(); index++) {
      nsAutoPtr<SyncLoopInfo>& loopInfo = mSyncLoopStack[index];
      MOZ_ASSERT(loopInfo);
      MOZ_ASSERT(loopInfo->mEventTarget);

      if (loopInfo->mEventTarget == aSyncLoopTarget) {
        valid = true;
        break;
      }

      MOZ_ASSERT(!SameCOMIdentity(loopInfo->mEventTarget, aSyncLoopTarget));
    }
  }

  MOZ_ASSERT(valid);
}
#endif

void
WorkerPrivate::PostMessageToParentInternal(
                            JSContext* aCx,
                            JS::Handle<JS::Value> aMessage,
                            const Sequence<JSObject*>& aTransferable,
                            ErrorResult& aRv)
{
  AssertIsOnWorkerThread();

  JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());

  aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
                                                          &transferable);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  RefPtr<MessageEventRunnable> runnable =
    new MessageEventRunnable(this,
                             WorkerRunnable::ParentThreadUnchangedBusyCount);

  UniquePtr<AbstractTimelineMarker> start;
  UniquePtr<AbstractTimelineMarker> end;
  RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
  bool isTimelineRecording = timelines && !timelines->IsEmpty();

  if (isTimelineRecording) {
    start = MakeUnique<WorkerTimelineMarker>(NS_IsMainThread()
      ? ProfileTimelineWorkerOperationType::SerializeDataOnMainThread
      : ProfileTimelineWorkerOperationType::SerializeDataOffMainThread,
      MarkerTracingType::START);
  }

  runnable->Write(aCx, aMessage, transferable, JS::CloneDataPolicy(), aRv);

  if (isTimelineRecording) {
    end = MakeUnique<WorkerTimelineMarker>(NS_IsMainThread()
      ? ProfileTimelineWorkerOperationType::SerializeDataOnMainThread
      : ProfileTimelineWorkerOperationType::SerializeDataOffMainThread,
      MarkerTracingType::END);
    timelines->AddMarkerForAllObservedDocShells(start);
    timelines->AddMarkerForAllObservedDocShells(end);
  }

  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  if (!runnable->Dispatch()) {
    aRv = NS_ERROR_FAILURE;
  }
}

void
WorkerPrivate::EnterDebuggerEventLoop()
{
  AssertIsOnWorkerThread();

  JSContext* cx = GetJSContext();
  MOZ_ASSERT(cx);

  uint32_t currentEventLoopLevel = ++mDebuggerEventLoopLevel;

  while (currentEventLoopLevel <= mDebuggerEventLoopLevel) {
    bool debuggerRunnablesPending = false;

    {
      MutexAutoLock lock(mMutex);

      debuggerRunnablesPending = !mDebuggerQueue.IsEmpty();
    }

    // Don't block with the periodic GC timer running.
    if (!debuggerRunnablesPending) {
      SetGCTimerMode(IdleTimer);
    }

    // Wait for something to do
    {
      MutexAutoLock lock(mMutex);

      while (mControlQueue.IsEmpty() &&
             !(debuggerRunnablesPending = !mDebuggerQueue.IsEmpty())) {
        WaitForWorkerEvents();
      }

      ProcessAllControlRunnablesLocked();

      // XXXkhuey should we abort JS on the stack here if we got Abort above?
    }

    if (debuggerRunnablesPending) {
      // Start the periodic GC timer if it is not already running.
      SetGCTimerMode(PeriodicTimer);

      WorkerRunnable* runnable;

      {
        MutexAutoLock lock(mMutex);

        mDebuggerQueue.Pop(runnable);
      }

      MOZ_ASSERT(runnable);
      static_cast<nsIRunnable*>(runnable)->Run();
      runnable->Release();

      // Flush the promise queue.
      Promise::PerformWorkerDebuggerMicroTaskCheckpoint();

      // Now *might* be a good time to GC. Let the JS engine make the decision.
      if (JS::CurrentGlobalOrNull(cx)) {
        JS_MaybeGC(cx);
      }
    }
  }
}

void
WorkerPrivate::LeaveDebuggerEventLoop()
{
  AssertIsOnWorkerThread();

  MutexAutoLock lock(mMutex);

  if (mDebuggerEventLoopLevel > 0) {
    --mDebuggerEventLoopLevel;
  }
}

void
WorkerPrivate::PostMessageToDebugger(const nsAString& aMessage)
{
  mDebugger->PostMessageToDebugger(aMessage);
}

void
WorkerPrivate::SetDebuggerImmediate(dom::Function& aHandler, ErrorResult& aRv)
{
  AssertIsOnWorkerThread();

  RefPtr<DebuggerImmediateRunnable> runnable =
    new DebuggerImmediateRunnable(this, aHandler);
  if (!runnable->Dispatch()) {
    aRv.Throw(NS_ERROR_FAILURE);
  }
}

void
WorkerPrivate::ReportErrorToDebugger(const nsAString& aFilename,
                                     uint32_t aLineno,
                                     const nsAString& aMessage)
{
  mDebugger->ReportErrorToDebugger(aFilename, aLineno, aMessage);
}

bool
WorkerPrivate::NotifyInternal(JSContext* aCx, Status aStatus)
{
  AssertIsOnWorkerThread();

  NS_ASSERTION(aStatus > Running && aStatus < Dead, "Bad status!");

  RefPtr<EventTarget> eventTarget;

  // Save the old status and set the new status.
  Status previousStatus;
  {
    MutexAutoLock lock(mMutex);

    if (mStatus >= aStatus) {
      MOZ_ASSERT(!mEventTarget);
      return true;
    }

    previousStatus = mStatus;
    mStatus = aStatus;

    // Mark parent status as closing immediately to avoid new events being
    // dispatched after we clear the queue below.
    if (aStatus == Closing) {
      Close();
    }

    mEventTarget.swap(eventTarget);
  }

  // Now that mStatus > Running, no-one can create a new WorkerEventTarget or
  // WorkerCrossThreadDispatcher if we don't already have one.
  if (eventTarget) {
    // Since we'll no longer process events, make sure we no longer allow anyone
    // to post them. We have to do this without mMutex held, since our mutex
    // must be acquired *after* the WorkerEventTarget's mutex when they're both
    // held.
    eventTarget->Disable();
    eventTarget = nullptr;
  }

  if (mCrossThreadDispatcher) {
    // Since we'll no longer process events, make sure we no longer allow
    // anyone to post them. We have to do this without mMutex held, since our
    // mutex must be acquired *after* mCrossThreadDispatcher's mutex when
    // they're both held.
    mCrossThreadDispatcher->Forget();
    mCrossThreadDispatcher = nullptr;
  }

  MOZ_ASSERT(previousStatus != Pending);

  // Let all our holders know the new status.
  NotifyHolders(aCx, aStatus);
  MOZ_ASSERT(!JS_IsExceptionPending(aCx));

  // If this is the first time our status has changed then we need to clear the
  // main event queue.
  if (previousStatus == Running) {
    // NB: If we're in a sync loop, we can't clear the queue immediately,
    // because this is the wrong queue. So we have to defer it until later.
    if (!mSyncLoopStack.IsEmpty()) {
      mPendingEventQueueClearing = true;
    } else {
      ClearMainEventQueue(WorkerRan);
    }
  }

  // If the worker script never ran, or failed to compile, we don't need to do
  // anything else.
  if (!GlobalScope()) {
    return true;
  }

  // Don't abort the script.
  if (aStatus == Closing) {
    return true;
  }

  MOZ_ASSERT(aStatus == Terminating ||
             aStatus == Canceling ||
             aStatus == Killing);

  // Always abort the script.
  return false;
}

void
WorkerErrorBase::AssignErrorBase(JSErrorBase* aReport)
{
  mFilename = NS_ConvertUTF8toUTF16(aReport->filename);
  mLineNumber = aReport->lineno;
  mColumnNumber = aReport->column;
  mErrorNumber = aReport->errorNumber;
}

void
WorkerErrorNote::AssignErrorNote(JSErrorNotes::Note* aNote)
{
  WorkerErrorBase::AssignErrorBase(aNote);
  xpc::ErrorNote::ErrorNoteToMessageString(aNote, mMessage);
}

void
WorkerErrorReport::AssignErrorReport(JSErrorReport* aReport)
{
  WorkerErrorBase::AssignErrorBase(aReport);
  xpc::ErrorReport::ErrorReportToMessageString(aReport, mMessage);

  mLine.Assign(aReport->linebuf(), aReport->linebufLength());
  mFlags = aReport->flags;
  MOZ_ASSERT(aReport->exnType >= JSEXN_FIRST && aReport->exnType < JSEXN_LIMIT);
  mExnType = JSExnType(aReport->exnType);
  mMutedError = aReport->isMuted;

  if (aReport->notes) {
    if (!mNotes.SetLength(aReport->notes->length(), fallible)) {
      return;
    }

    size_t i = 0;
    for (auto&& note : *aReport->notes) {
      mNotes.ElementAt(i).AssignErrorNote(note.get());
      i++;
    }
  }
}

void
WorkerPrivate::ReportError(JSContext* aCx, JS::ConstUTF8CharsZ aToStringResult,
                           JSErrorReport* aReport)
{
  AssertIsOnWorkerThread();

  if (!MayContinueRunning() || mErrorHandlerRecursionCount == 2) {
    return;
  }

  NS_ASSERTION(mErrorHandlerRecursionCount == 0 ||
               mErrorHandlerRecursionCount == 1,
               "Bad recursion logic!");

  JS::Rooted<JS::Value> exn(aCx);
  if (!JS_GetPendingException(aCx, &exn)) {
    // Probably shouldn't actually happen?  But let's go ahead and just use null
    // for lack of anything better.
    exn.setNull();
  }
  JS_ClearPendingException(aCx);

  WorkerErrorReport report;
  if (aReport) {
    report.AssignErrorReport(aReport);
  }
  else {
    report.mFlags = nsIScriptError::errorFlag | nsIScriptError::exceptionFlag;
  }

  if (report.mMessage.IsEmpty() && aToStringResult) {
    nsDependentCString toStringResult(aToStringResult.c_str());
    if (!AppendUTF8toUTF16(toStringResult, report.mMessage, mozilla::fallible)) {
      // Try again, with only a 1 KB string. Do this infallibly this time.
      // If the user doesn't have 1 KB to spare we're done anyways.
      uint32_t index = std::min(uint32_t(1024), toStringResult.Length());

      // Drop the last code point that may be cropped.
      index = RewindToPriorUTF8Codepoint(toStringResult.BeginReading(), index);

      nsDependentCString truncatedToStringResult(aToStringResult.c_str(),
                                                 index);
      AppendUTF8toUTF16(truncatedToStringResult, report.mMessage);
    }
  }

  mErrorHandlerRecursionCount++;

  // Don't want to run the scope's error handler if this is a recursive error or
  // if we ran out of memory.
  bool fireAtScope = mErrorHandlerRecursionCount == 1 &&
                     report.mErrorNumber != JSMSG_OUT_OF_MEMORY &&
                     JS::CurrentGlobalOrNull(aCx);

  ReportErrorRunnable::ReportError(aCx, this, fireAtScope, nullptr, report, 0,
                                   exn);

  mErrorHandlerRecursionCount--;
}

// static
void
WorkerPrivate::ReportErrorToConsole(const char* aMessage)
{
  WorkerPrivate* wp = nullptr;
  if (!NS_IsMainThread()) {
    wp = GetCurrentThreadWorkerPrivate();
  }

  ReportErrorToConsoleRunnable::Report(wp, aMessage);
}

int32_t
WorkerPrivate::SetTimeout(JSContext* aCx,
                          nsIScriptTimeoutHandler* aHandler,
                          int32_t aTimeout, bool aIsInterval,
                          ErrorResult& aRv)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(aHandler);

  const int32_t timerId = mNextTimeoutId++;

  Status currentStatus;
  {
    MutexAutoLock lock(mMutex);
    currentStatus = mStatus;
  }

  // If the worker is trying to call setTimeout/setInterval and the parent
  // thread has initiated the close process then just silently fail.
  if (currentStatus >= Closing) {
    aRv.Throw(NS_ERROR_FAILURE);
    return 0;
  }

  nsAutoPtr<TimeoutInfo> newInfo(new TimeoutInfo());
  newInfo->mIsInterval = aIsInterval;
  newInfo->mId = timerId;

  if (MOZ_UNLIKELY(timerId == INT32_MAX)) {
    NS_WARNING("Timeout ids overflowed!");
    mNextTimeoutId = 1;
  }

  newInfo->mHandler = aHandler;

  // See if any of the optional arguments were passed.
  aTimeout = std::max(0, aTimeout);
  newInfo->mInterval = TimeDuration::FromMilliseconds(aTimeout);

  newInfo->mTargetTime = TimeStamp::Now() + newInfo->mInterval;

  nsAutoPtr<TimeoutInfo>* insertedInfo =
    mTimeouts.InsertElementSorted(newInfo.forget(), GetAutoPtrComparator(mTimeouts));

  LOG(TimeoutsLog(), ("Worker %p has new timeout: delay=%d interval=%s\n",
                      this, aTimeout, aIsInterval ? "yes" : "no"));

  // If the timeout we just made is set to fire next then we need to update the
  // timer, unless we're currently running timeouts.
  if (insertedInfo == mTimeouts.Elements() && !mRunningExpiredTimeouts) {
    nsresult rv;

    if (!mTimer) {
      mTimer = do_CreateInstance(NS_TIMER_CONTRACTID, &rv);
      if (NS_FAILED(rv)) {
        aRv.Throw(rv);
        return 0;
      }

      mTimerRunnable = new TimerRunnable(this);
    }

    if (!mTimerRunning) {
      if (!ModifyBusyCountFromWorker(true)) {
        aRv.Throw(NS_ERROR_FAILURE);
        return 0;
      }
      mTimerRunning = true;
    }

    if (!RescheduleTimeoutTimer(aCx)) {
      aRv.Throw(NS_ERROR_FAILURE);
      return 0;
    }
  }

  return timerId;
}

void
WorkerPrivate::ClearTimeout(int32_t aId)
{
  AssertIsOnWorkerThread();

  if (!mTimeouts.IsEmpty()) {
    NS_ASSERTION(mTimerRunning, "Huh?!");

    for (uint32_t index = 0; index < mTimeouts.Length(); index++) {
      nsAutoPtr<TimeoutInfo>& info = mTimeouts[index];
      if (info->mId == aId) {
        info->mCanceled = true;
        break;
      }
    }
  }
}

bool
WorkerPrivate::RunExpiredTimeouts(JSContext* aCx)
{
  AssertIsOnWorkerThread();

  // We may be called recursively (e.g. close() inside a timeout) or we could
  // have been canceled while this event was pending, bail out if there is
  // nothing to do.
  if (mRunningExpiredTimeouts || !mTimerRunning) {
    return true;
  }

  NS_ASSERTION(mTimer && mTimerRunnable, "Must have a timer!");
  NS_ASSERTION(!mTimeouts.IsEmpty(), "Should have some work to do!");

  bool retval = true;

  AutoPtrComparator<TimeoutInfo> comparator = GetAutoPtrComparator(mTimeouts);
  JS::Rooted<JSObject*> global(aCx, JS::CurrentGlobalOrNull(aCx));

  // We want to make sure to run *something*, even if the timer fired a little
  // early. Fudge the value of now to at least include the first timeout.
  const TimeStamp actual_now = TimeStamp::Now();
  const TimeStamp now = std::max(actual_now, mTimeouts[0]->mTargetTime);

  if (now != actual_now) {
    LOG(TimeoutsLog(), ("Worker %p fudged timeout by %f ms.\n", this,
                        (now - actual_now).ToMilliseconds()));
  }

  AutoTArray<TimeoutInfo*, 10> expiredTimeouts;
  for (uint32_t index = 0; index < mTimeouts.Length(); index++) {
    nsAutoPtr<TimeoutInfo>& info = mTimeouts[index];
    if (info->mTargetTime > now) {
      break;
    }
    expiredTimeouts.AppendElement(info);
  }

  // Guard against recursion.
  mRunningExpiredTimeouts = true;

  // Run expired timeouts.
  for (uint32_t index = 0; index < expiredTimeouts.Length(); index++) {
    TimeoutInfo*& info = expiredTimeouts[index];

    if (info->mCanceled) {
      continue;
    }

    LOG(TimeoutsLog(), ("Worker %p executing timeout with original delay %f ms.\n",
                        this, info->mInterval.ToMilliseconds()));

    // Always check JS_IsExceptionPending if something fails, and if
    // JS_IsExceptionPending returns false (i.e. uncatchable exception) then
    // break out of the loop.
    const char *reason;
    if (info->mIsInterval) {
      reason = "setInterval handler";
    } else {
      reason = "setTimeout handler";
    }

    RefPtr<Function> callback = info->mHandler->GetCallback();
    if (!callback) {
      // scope for the AutoEntryScript, so it comes off the stack before we do
      // Promise::PerformMicroTaskCheckpoint.
      AutoEntryScript aes(global, reason, false);

      // Evaluate the timeout expression.
      const nsAString& script = info->mHandler->GetHandlerText();

      const char* filename = nullptr;
      uint32_t lineNo = 0, dummyColumn = 0;
      info->mHandler->GetLocation(&filename, &lineNo, &dummyColumn);

      JS::CompileOptions options(aes.cx());
      options.setFileAndLine(filename, lineNo).setNoScriptRval(true);

      JS::Rooted<JS::Value> unused(aes.cx());

      if (!JS::Evaluate(aes.cx(), options, script.BeginReading(),
                        script.Length(), &unused) &&
          !JS_IsExceptionPending(aCx)) {
        retval = false;
        break;
      }
    } else {
      ErrorResult rv;
      JS::Rooted<JS::Value> ignoredVal(aCx);
      callback->Call(GlobalScope(), info->mHandler->GetArgs(), &ignoredVal, rv,
                     reason);
      if (rv.IsUncatchableException()) {
        rv.SuppressException();
        retval = false;
        break;
      }

      rv.SuppressException();
    }

    // Since we might be processing more timeouts, go ahead and flush
    // the promise queue now before we do that.
    Promise::PerformWorkerMicroTaskCheckpoint();

    NS_ASSERTION(mRunningExpiredTimeouts, "Someone changed this!");
  }

  // No longer possible to be called recursively.
  mRunningExpiredTimeouts = false;

  // Now remove canceled and expired timeouts from the main list.
  // NB: The timeouts present in expiredTimeouts must have the same order
  // with respect to each other in mTimeouts.  That is, mTimeouts is just
  // expiredTimeouts with extra elements inserted.  There may be unexpired
  // timeouts that have been inserted between the expired timeouts if the
  // timeout event handler called setTimeout/setInterval.
  for (uint32_t index = 0, expiredTimeoutIndex = 0,
       expiredTimeoutLength = expiredTimeouts.Length();
       index < mTimeouts.Length(); ) {
    nsAutoPtr<TimeoutInfo>& info = mTimeouts[index];
    if ((expiredTimeoutIndex < expiredTimeoutLength &&
         info == expiredTimeouts[expiredTimeoutIndex] &&
         ++expiredTimeoutIndex) ||
        info->mCanceled) {
      if (info->mIsInterval && !info->mCanceled) {
        // Reschedule intervals.
        info->mTargetTime = info->mTargetTime + info->mInterval;
        // Don't resort the list here, we'll do that at the end.
        ++index;
      }
      else {
        mTimeouts.RemoveElement(info);
      }
    }
    else {
      // If info did not match the current entry in expiredTimeouts, it
      // shouldn't be there at all.
      NS_ASSERTION(!expiredTimeouts.Contains(info),
                   "Our timeouts are out of order!");
      ++index;
    }
  }

  mTimeouts.Sort(comparator);

  // Either signal the parent that we're no longer using timeouts or reschedule
  // the timer.
  if (mTimeouts.IsEmpty()) {
    if (!ModifyBusyCountFromWorker(false)) {
      retval = false;
    }
    mTimerRunning = false;
  }
  else if (retval && !RescheduleTimeoutTimer(aCx)) {
    retval = false;
  }

  return retval;
}

bool
WorkerPrivate::RescheduleTimeoutTimer(JSContext* aCx)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(!mRunningExpiredTimeouts);
  NS_ASSERTION(!mTimeouts.IsEmpty(), "Should have some timeouts!");
  NS_ASSERTION(mTimer && mTimerRunnable, "Should have a timer!");

  // NB: This is important! The timer may have already fired, e.g. if a timeout
  // callback itself calls setTimeout for a short duration and then takes longer
  // than that to finish executing. If that has happened, it's very important
  // that we don't execute the event that is now pending in our event queue, or
  // our code in RunExpiredTimeouts to "fudge" the timeout value will unleash an
  // early timeout when we execute the event we're about to queue.
  mTimer->Cancel();

  double delta =
    (mTimeouts[0]->mTargetTime - TimeStamp::Now()).ToMilliseconds();
  uint32_t delay = delta > 0 ? std::min(delta, double(UINT32_MAX)) : 0;

  LOG(TimeoutsLog(), ("Worker %p scheduled timer for %d ms, %" PRIuSIZE " pending timeouts\n",
                      this, delay, mTimeouts.Length()));

  nsresult rv = mTimer->InitWithCallback(mTimerRunnable, delay, nsITimer::TYPE_ONE_SHOT);
  if (NS_FAILED(rv)) {
    JS_ReportErrorASCII(aCx, "Failed to start timer!");
    return false;
  }

  return true;
}

void
WorkerPrivate::UpdateContextOptionsInternal(
                                    JSContext* aCx,
                                    const JS::ContextOptions& aContextOptions)
{
  AssertIsOnWorkerThread();

  JS::ContextOptionsRef(aCx) = aContextOptions;

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->UpdateContextOptions(aContextOptions);
  }
}

void
WorkerPrivate::UpdateLanguagesInternal(const nsTArray<nsString>& aLanguages)
{
  WorkerGlobalScope* globalScope = GlobalScope();
  if (globalScope) {
    RefPtr<WorkerNavigator> nav = globalScope->GetExistingNavigator();
    if (nav) {
      nav->SetLanguages(aLanguages);
    }
  }

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->UpdateLanguages(aLanguages);
  }
}

void
WorkerPrivate::UpdatePreferenceInternal(WorkerPreference aPref, bool aValue)
{
  AssertIsOnWorkerThread();
  MOZ_ASSERT(aPref >= 0 && aPref < WORKERPREF_COUNT);

  mPreferences[aPref] = aValue;

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->UpdatePreference(aPref, aValue);
  }
}

void
WorkerPrivate::UpdateJSWorkerMemoryParameterInternal(JSContext* aCx,
                                                     JSGCParamKey aKey,
                                                     uint32_t aValue)
{
  AssertIsOnWorkerThread();

  // XXX aValue might be 0 here (telling us to unset a previous value for child
  // workers). Calling JS_SetGCParameter with a value of 0 isn't actually
  // supported though. We really need some way to revert to a default value
  // here.
  if (aValue) {
    JS_SetGCParameter(aCx, aKey, aValue);
  }

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->UpdateJSWorkerMemoryParameter(aKey, aValue);
  }
}

#ifdef JS_GC_ZEAL
void
WorkerPrivate::UpdateGCZealInternal(JSContext* aCx, uint8_t aGCZeal,
                                    uint32_t aFrequency)
{
  AssertIsOnWorkerThread();

  JS_SetGCZeal(aCx, aGCZeal, aFrequency);

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->UpdateGCZeal(aGCZeal, aFrequency);
  }
}
#endif

void
WorkerPrivate::GarbageCollectInternal(JSContext* aCx, bool aShrinking,
                                      bool aCollectChildren)
{
  AssertIsOnWorkerThread();

  if (!GlobalScope()) {
    // We haven't compiled anything yet. Just bail out.
    return;
  }

  if (aShrinking || aCollectChildren) {
    JS::PrepareForFullGC(aCx);

    if (aShrinking) {
      JS::GCForReason(aCx, GC_SHRINK, JS::gcreason::DOM_WORKER);

      if (!aCollectChildren) {
        LOG(WorkerLog(), ("Worker %p collected idle garbage\n", this));
      }
    }
    else {
      JS::GCForReason(aCx, GC_NORMAL, JS::gcreason::DOM_WORKER);
      LOG(WorkerLog(), ("Worker %p collected garbage\n", this));
    }
  }
  else {
    JS_MaybeGC(aCx);
    LOG(WorkerLog(), ("Worker %p collected periodic garbage\n", this));
  }

  if (aCollectChildren) {
    for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
      mChildWorkers[index]->GarbageCollect(aShrinking);
    }
  }
}

void
WorkerPrivate::CycleCollectInternal(bool aCollectChildren)
{
  AssertIsOnWorkerThread();

  nsCycleCollector_collect(nullptr);

  if (aCollectChildren) {
    for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
      mChildWorkers[index]->CycleCollect(/* dummy = */ false);
    }
  }
}

void
WorkerPrivate::MemoryPressureInternal()
{
  AssertIsOnWorkerThread();

  RefPtr<Console> console = mScope ? mScope->GetConsoleIfExists() : nullptr;
  if (console) {
    console->ClearStorage();
  }

  console = mDebuggerScope ? mDebuggerScope->GetConsoleIfExists() : nullptr;
  if (console) {
    console->ClearStorage();
  }

  for (uint32_t index = 0; index < mChildWorkers.Length(); index++) {
    mChildWorkers[index]->MemoryPressure(false);
  }
}

void
WorkerPrivate::SetThread(WorkerThread* aThread)
{
  if (aThread) {
#ifdef DEBUG
    {
      bool isOnCurrentThread;
      MOZ_ASSERT(NS_SUCCEEDED(aThread->IsOnCurrentThread(&isOnCurrentThread)));
      MOZ_ASSERT(isOnCurrentThread);
    }