DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (63ef0618ec9a)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147
/* -*- 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 "MessageEventRunnable.h"

#include "mozilla/dom/MessageEvent.h"
#include "mozilla/dom/MessageEventBinding.h"
#include "mozilla/TimelineConsumers.h"
#include "mozilla/WorkerTimelineMarker.h"
#include "nsQueryObject.h"
#include "WorkerPrivate.h"
#include "WorkerScope.h"

namespace mozilla {
namespace dom {

MessageEventRunnable::MessageEventRunnable(WorkerPrivate* aWorkerPrivate,
                                           TargetAndBusyBehavior aBehavior)
    : WorkerDebuggeeRunnable(aWorkerPrivate, aBehavior),
      StructuredCloneHolder(CloningSupported, TransferringSupported,
                            StructuredCloneScope::SameProcessDifferentThread) {}

bool MessageEventRunnable::DispatchDOMEvent(JSContext* aCx,
                                            WorkerPrivate* aWorkerPrivate,
                                            DOMEventTargetHelper* aTarget,
                                            bool aIsMainThread) {
  nsCOMPtr<nsIGlobalObject> parent = 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);
  IgnoredErrorResult 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())) {
    DispatchError(aCx, aTarget);
    return false;
  }

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

  RefPtr<MessageEvent> event = new MessageEvent(aTarget, nullptr, nullptr);
  event->InitMessageEvent(nullptr, NS_LITERAL_STRING("message"), CanBubble::eNo,
                          Cancelable::eNo, messageData, EmptyString(),
                          EmptyString(), nullptr, ports);

  event->SetTrusted(true);

  aTarget->DispatchEvent(*event);

  return true;
}

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

    // Once a window has frozen its workers, their
    // mMainThreadDebuggeeEventTargets should be paused, and their
    // WorkerDebuggeeRunnables should not be being executed. The same goes for
    // WorkerDebuggeeRunnables sent from child to parent workers, but since a
    // frozen parent worker runs only control runnables anyway, that is taken
    // care of naturally.
    MOZ_ASSERT(!aWorkerPrivate->IsFrozen());

    // Similarly for paused windows; all its workers should have been informed.
    // (Subworkers are unaffected by paused windows.)
    MOZ_ASSERT(!aWorkerPrivate->IsParentWindowPaused());

    aWorkerPrivate->AssertInnerWindowIsCorrect();

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

  MOZ_ASSERT(aWorkerPrivate == GetWorkerPrivateFromContext(aCx));

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

void MessageEventRunnable::DispatchError(JSContext* aCx,
                                         DOMEventTargetHelper* aTarget) {
  RootedDictionary<MessageEventInit> init(aCx);
  init.mBubbles = false;
  init.mCancelable = false;

  RefPtr<Event> event = MessageEvent::Constructor(
      aTarget, NS_LITERAL_STRING("messageerror"), init);
  event->SetTrusted(true);

  aTarget->DispatchEvent(*event);
}

}  // namespace dom
}  // namespace mozilla