gecko-dev/dom/base/ContentProcessMessageManager.cpp

/* -*- 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 "ContentProcessMessageManager.h"

#include "nsContentCID.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/MessageManagerBinding.h"
#include "mozilla/dom/ParentProcessMessageManager.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/ipc/SharedMap.h"
#include "mozilla/HoldDropJSObjects.h"

using namespace mozilla;
using namespace mozilla::dom;

bool ContentProcessMessageManager::sWasCreated = false;

ContentProcessMessageManager::ContentProcessMessageManager(
    nsFrameMessageManager* aMessageManager)
    : MessageManagerGlobal(aMessageManager), mInitialized(false) {
  mozilla::HoldJSObjects(this);
}

ContentProcessMessageManager::~ContentProcessMessageManager() {
  mAnonymousGlobalScopes.Clear();
  mozilla::DropJSObjects(this);
}

ContentProcessMessageManager* ContentProcessMessageManager::Get() {
  nsCOMPtr<nsIMessageSender> service =
      do_GetService(NS_CHILDPROCESSMESSAGEMANAGER_CONTRACTID);
  if (!service) {
    return nullptr;
  }
  sWasCreated = true;
  return static_cast<ContentProcessMessageManager*>(service.get());
}

already_AddRefed<mozilla::dom::ipc::SharedMap>
ContentProcessMessageManager::GetSharedData() {
  if (ContentChild* child = ContentChild::GetSingleton()) {
    return do_AddRef(child->SharedData());
  }
  auto* ppmm = nsFrameMessageManager::sParentProcessManager;
  return do_AddRef(ppmm->SharedData()->GetReadOnly());
}

bool ContentProcessMessageManager::WasCreated() { return sWasCreated; }

void ContentProcessMessageManager::MarkForCC() {
  MarkScopesForCC();
  MessageManagerGlobal::MarkForCC();
}

NS_IMPL_CYCLE_COLLECTION_CLASS(ContentProcessMessageManager)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ContentProcessMessageManager)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMessageManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ContentProcessMessageManager)
  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
  tmp->nsMessageManagerScriptExecutor::Trace(aCallbacks, aClosure);
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ContentProcessMessageManager)
  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessageManager)
  tmp->nsMessageManagerScriptExecutor::Unlink();
  NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ContentProcessMessageManager)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMessageSender)
  NS_INTERFACE_MAP_ENTRY(nsIMessageSender)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(ContentProcessMessageManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ContentProcessMessageManager)

bool ContentProcessMessageManager::Init() {
  if (mInitialized) {
    return true;
  }
  mInitialized = true;

  return nsMessageManagerScriptExecutor::Init();
}

JSObject* ContentProcessMessageManager::WrapObject(
    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  return ContentProcessMessageManager_Binding::Wrap(aCx, this, aGivenProto);
}

JSObject* ContentProcessMessageManager::GetOrCreateWrapper() {
  JS::RootedValue val(RootingCx());
  {
    // Scope to run ~AutoJSAPI before working with a raw JSObject*.
    AutoJSAPI jsapi;
    jsapi.Init();

    if (!GetOrCreateDOMReflectorNoWrap(jsapi.cx(), this, &val)) {
      return nullptr;
    }
  }
  MOZ_ASSERT(val.isObject());
  return &val.toObject();
}

void ContentProcessMessageManager::LoadScript(const nsAString& aURL) {
  Init();
  JS::Rooted<JSObject*> messageManager(mozilla::dom::RootingCx(),
                                       GetOrCreateWrapper());
  LoadScriptInternal(messageManager, aURL, true);
}

void ContentProcessMessageManager::SetInitialProcessData(
    JS::HandleValue aInitialData) {
  mMessageManager->SetInitialProcessData(aInitialData);
}