tor-browser

The Tor Browser
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ContentProcessMessageManager.cpp (4265B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "ContentProcessMessageManager.h"
      8 
      9 #include "mozilla/HoldDropJSObjects.h"
     10 #include "mozilla/dom/ContentChild.h"
     11 #include "mozilla/dom/MessageManagerBinding.h"
     12 #include "mozilla/dom/ParentProcessMessageManager.h"
     13 #include "mozilla/dom/ScriptSettings.h"
     14 #include "mozilla/dom/ipc/SharedMap.h"
     15 
     16 using namespace mozilla;
     17 using namespace mozilla::dom;
     18 
     19 bool ContentProcessMessageManager::sWasCreated = false;
     20 
     21 ContentProcessMessageManager::ContentProcessMessageManager(
     22    nsFrameMessageManager* aMessageManager)
     23    : MessageManagerGlobal(aMessageManager), mInitialized(false) {
     24  mozilla::HoldJSObjects(this);
     25 }
     26 
     27 ContentProcessMessageManager::~ContentProcessMessageManager() {
     28  mozilla::DropJSObjects(this);
     29 }
     30 
     31 ContentProcessMessageManager* ContentProcessMessageManager::Get() {
     32  nsCOMPtr<nsIMessageSender> service =
     33      do_GetService("@mozilla.org/childprocessmessagemanager;1");
     34  if (!service) {
     35    return nullptr;
     36  }
     37  sWasCreated = true;
     38  return static_cast<ContentProcessMessageManager*>(service.get());
     39 }
     40 
     41 already_AddRefed<mozilla::dom::ipc::SharedMap>
     42 ContentProcessMessageManager::GetSharedData() {
     43  if (ContentChild* child = ContentChild::GetSingleton()) {
     44    return do_AddRef(child->SharedData());
     45  }
     46  auto* ppmm = nsFrameMessageManager::sParentProcessManager;
     47  return do_AddRef(ppmm->SharedData()->GetReadOnly());
     48 }
     49 
     50 bool ContentProcessMessageManager::WasCreated() { return sWasCreated; }
     51 
     52 void ContentProcessMessageManager::MarkForCC() {
     53  MarkScopesForCC();
     54  MessageManagerGlobal::MarkForCC();
     55 }
     56 
     57 NS_IMPL_CYCLE_COLLECTION_CLASS(ContentProcessMessageManager)
     58 
     59 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ContentProcessMessageManager)
     60  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMessageManager)
     61 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
     62 
     63 NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(ContentProcessMessageManager)
     64  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
     65  tmp->nsMessageManagerScriptExecutor::Trace(aCallbacks, aClosure);
     66 NS_IMPL_CYCLE_COLLECTION_TRACE_END
     67 
     68 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ContentProcessMessageManager)
     69  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
     70  NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessageManager)
     71  tmp->nsMessageManagerScriptExecutor::Unlink();
     72  NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
     73 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
     74 
     75 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ContentProcessMessageManager)
     76  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
     77  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMessageSender)
     78  NS_INTERFACE_MAP_ENTRY(nsIMessageSender)
     79  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
     80 NS_INTERFACE_MAP_END
     81 
     82 NS_IMPL_CYCLE_COLLECTING_ADDREF(ContentProcessMessageManager)
     83 NS_IMPL_CYCLE_COLLECTING_RELEASE(ContentProcessMessageManager)
     84 
     85 bool ContentProcessMessageManager::Init() {
     86  if (mInitialized) {
     87    return true;
     88  }
     89  mInitialized = true;
     90 
     91  return nsMessageManagerScriptExecutor::Init();
     92 }
     93 
     94 JSObject* ContentProcessMessageManager::WrapObject(
     95    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
     96  return ContentProcessMessageManager_Binding::Wrap(aCx, this, aGivenProto);
     97 }
     98 
     99 JSObject* ContentProcessMessageManager::GetOrCreateWrapper() {
    100  JS::Rooted<JS::Value> val(RootingCx());
    101  {
    102    // Scope to run ~AutoJSAPI before working with a raw JSObject*.
    103    AutoJSAPI jsapi;
    104    jsapi.Init();
    105 
    106    if (!GetOrCreateDOMReflectorNoWrap(jsapi.cx(), this, &val)) {
    107      JS_ClearPendingException(jsapi.cx());
    108      return nullptr;
    109    }
    110  }
    111  MOZ_ASSERT(val.isObject());
    112  return &val.toObject();
    113 }
    114 
    115 bool ContentProcessMessageManager::LoadScript(const nsAString& aURL) {
    116  Init();
    117  JSObject* wrapper = GetOrCreateWrapper();
    118  if (wrapper) {
    119    JS::Rooted<JSObject*> messageManager(mozilla::dom::RootingCx(), wrapper);
    120    LoadScriptInternal(messageManager, aURL, true);
    121    return true;
    122  }
    123  return false;
    124 }
    125 
    126 void ContentProcessMessageManager::SetInitialProcessData(
    127    JS::Handle<JS::Value> aInitialData) {
    128  mMessageManager->SetInitialProcessData(aInitialData);
    129 }