The Tor Browser: dom/ipc/ContentChild.cpp@b8a032363ba2 (annotated)

dom/ipc/ContentChild.cpp@b8a032363ba2 (annotated)

dom/ipc/ContentChild.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* vim: set sw=4 ts=8 et 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/. */
 #ifdef MOZ_WIDGET_GTK
 #include <gtk/gtk.h>
 #endif
 #ifdef MOZ_WIDGET_QT
 #include "nsQAppInstance.h"
 #endif
 #include "ContentChild.h"
 #include "CrashReporterChild.h"
 #include "FileDescriptorSetChild.h"
 #include "TabChild.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/dom/asmjscache/AsmJSCache.h"
 #include "mozilla/dom/asmjscache/PAsmJSCacheEntryChild.h"
 #include "mozilla/dom/ExternalHelperAppChild.h"
 #include "mozilla/dom/PCrashReporterChild.h"
 #include "mozilla/dom/DOMStorageIPC.h"
 #include "mozilla/hal_sandbox/PHalChild.h"
 #include "mozilla/ipc/BackgroundChild.h"
 #include "mozilla/ipc/GeckoChildProcessHost.h"
 #include "mozilla/ipc/TestShellChild.h"
 #include "mozilla/layers/CompositorChild.h"
 #include "mozilla/layers/ImageBridgeChild.h"
 #include "mozilla/layers/PCompositorChild.h"
 #include "mozilla/net/NeckoChild.h"
 #include "mozilla/Preferences.h"
 #if defined(MOZ_CONTENT_SANDBOX)
 #if defined(XP_WIN)
 #define TARGET_SANDBOX_EXPORTS
 #include "mozilla/sandboxTarget.h"
 #elif defined(XP_LINUX)
 #include "mozilla/Sandbox.h"
 #endif
 #endif
 #include "mozilla/unused.h"
 #include "nsIConsoleListener.h"
 #include "nsIIPCBackgroundChildCreateCallback.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsIMemoryReporter.h"
 #include "nsIMemoryInfoDumper.h"
 #include "nsIMutable.h"
 #include "nsIObserverService.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsServiceManagerUtils.h"
 #include "nsStyleSheetService.h"
 #include "nsXULAppAPI.h"
 #include "nsIScriptError.h"
 #include "nsIConsoleService.h"
 #include "nsJSEnvironment.h"
 #include "SandboxHal.h"
 #include "nsDebugImpl.h"
 #include "nsHashPropertyBag.h"
 #include "nsLayoutStylesheetCache.h"
 #include "nsIJSRuntimeService.h"
 #include "nsThreadManager.h"
 #include "IHistory.h"
 #include "nsNetUtil.h"
 #include "base/message_loop.h"
 #include "base/process_util.h"
 #include "base/task.h"
 #include "nsChromeRegistryContent.h"
 #include "nsFrameMessageManager.h"
 #include "nsIGeolocationProvider.h"
 #include "mozilla/dom/PMemoryReportRequestChild.h"
 #ifdef MOZ_PERMISSIONS
 #include "nsIScriptSecurityManager.h"
 #include "nsPermission.h"
 #include "nsPermissionManager.h"
 #endif
 #include "PermissionMessageUtils.h"
 #if defined(MOZ_WIDGET_ANDROID)
 #include "APKOpen.h"
 #endif
 #if defined(MOZ_WIDGET_GONK)
 #include "nsVolume.h"
 #include "nsVolumeService.h"
 #include "SpeakerManagerService.h"
 #endif
 #ifdef XP_WIN
 #include <process.h>
 #define getpid _getpid
 #endif
 #ifdef MOZ_X11
 #include "mozilla/X11Util.h"
 #endif
 #ifdef ACCESSIBILITY
 #include "nsIAccessibilityService.h"
 #endif
 #ifdef MOZ_NUWA_PROCESS
 #include <setjmp.h>
 #include "ipc/Nuwa.h"
 #endif
 #include "mozilla/dom/indexedDB/PIndexedDBChild.h"
 #include "mozilla/dom/mobilemessage/SmsChild.h"
 #include "mozilla/dom/devicestorage/DeviceStorageRequestChild.h"
 #include "mozilla/dom/PFileSystemRequestChild.h"
 #include "mozilla/dom/FileSystemTaskBase.h"
 #include "mozilla/dom/bluetooth/PBluetoothChild.h"
 #include "mozilla/dom/PFMRadioChild.h"
 #include "mozilla/ipc/InputStreamUtils.h"
 #ifdef MOZ_WEBSPEECH
 #include "mozilla/dom/PSpeechSynthesisChild.h"
 #endif
 #include "nsDOMFile.h"
 #include "nsIRemoteBlob.h"
 #include "ProcessUtils.h"
 #include "StructuredCloneUtils.h"
 #include "URIUtils.h"
 #include "nsContentUtils.h"
 #include "nsIPrincipal.h"
 #include "nsDeviceStorage.h"
 #include "AudioChannelService.h"
 #include "JavaScriptChild.h"
 #include "mozilla/dom/telephony/PTelephonyChild.h"
 #include "mozilla/dom/time/DateCacheCleaner.h"
 #include "mozilla/net/NeckoMessageUtils.h"
 using namespace base;
 using namespace mozilla;
 using namespace mozilla::docshell;
 using namespace mozilla::dom::bluetooth;
 using namespace mozilla::dom::devicestorage;
 using namespace mozilla::dom::ipc;
 using namespace mozilla::dom::mobilemessage;
 using namespace mozilla::dom::indexedDB;
 using namespace mozilla::dom::telephony;
 using namespace mozilla::hal_sandbox;
 using namespace mozilla::ipc;
 using namespace mozilla::layers;
 using namespace mozilla::net;
 using namespace mozilla::jsipc;
 #if defined(MOZ_WIDGET_GONK)
 using namespace mozilla::system;
 #endif
 #ifdef MOZ_NUWA_PROCESS
 static bool sNuwaForking = false;
 // The size of the reserved stack (in unsigned ints). It's used to reserve space
 // to push sigsetjmp() in NuwaCheckpointCurrentThread() to higher in the stack
 // so that after it returns and do other work we don't garble the stack we want
 // to preserve in NuwaCheckpointCurrentThread().
 #define RESERVED_INT_STACK 128
 // A sentinel value for checking whether RESERVED_INT_STACK is large enough.
 #define STACK_SENTINEL_VALUE 0xdeadbeef
 #endif
 namespace mozilla {
 namespace dom {
 class MemoryReportRequestChild : public PMemoryReportRequestChild,
                                  public nsIRunnable
 {
 public:
     NS_DECL_ISUPPORTS
     MemoryReportRequestChild(uint32_t aGeneration, const nsAString& aDMDDumpIdent);
     virtual ~MemoryReportRequestChild();
     NS_IMETHOD Run();
 private:
     uint32_t mGeneration;
     nsString mDMDDumpIdent;
 };
 NS_IMPL_ISUPPORTS(MemoryReportRequestChild, nsIRunnable)
 MemoryReportRequestChild::MemoryReportRequestChild(uint32_t aGeneration, const nsAString& aDMDDumpIdent)
 : mGeneration(aGeneration), mDMDDumpIdent(aDMDDumpIdent)
 {
     MOZ_COUNT_CTOR(MemoryReportRequestChild);
 }
 MemoryReportRequestChild::~MemoryReportRequestChild()
 {
     MOZ_COUNT_DTOR(MemoryReportRequestChild);
 }
 class AlertObserver
 {
 public:
     AlertObserver(nsIObserver *aObserver, const nsString& aData)
         : mObserver(aObserver)
         , mData(aData)
     {
     }
     ~AlertObserver() {}
     bool ShouldRemoveFrom(nsIObserver* aObserver,
                           const nsString& aData) const
     {
         return (mObserver == aObserver &&
                 mData == aData);
     }
     bool Observes(const nsString& aData) const
     {
         return mData.Equals(aData);
     }
     bool Notify(const nsCString& aType) const
     {
         mObserver->Observe(nullptr, aType.get(), mData.get());
         return true;
     }
 private:
     nsCOMPtr<nsIObserver> mObserver;
     nsString mData;
 };
 class ConsoleListener MOZ_FINAL : public nsIConsoleListener
 {
 public:
     ConsoleListener(ContentChild* aChild)
     : mChild(aChild) {}
     NS_DECL_ISUPPORTS
     NS_DECL_NSICONSOLELISTENER
 private:
     ContentChild* mChild;
     friend class ContentChild;
 };
 NS_IMPL_ISUPPORTS(ConsoleListener, nsIConsoleListener)
 NS_IMETHODIMP
 ConsoleListener::Observe(nsIConsoleMessage* aMessage)
 {
     if (!mChild)
         return NS_OK;
     nsCOMPtr<nsIScriptError> scriptError = do_QueryInterface(aMessage);
     if (scriptError) {
         nsString msg, sourceName, sourceLine;
         nsXPIDLCString category;
         uint32_t lineNum, colNum, flags;
         nsresult rv = scriptError->GetErrorMessage(msg);
         NS_ENSURE_SUCCESS(rv, rv);
         rv = scriptError->GetSourceName(sourceName);
         NS_ENSURE_SUCCESS(rv, rv);
         rv = scriptError->GetSourceLine(sourceLine);
         NS_ENSURE_SUCCESS(rv, rv);
         // Before we send the error to the parent process (which
         // involves copying the memory), truncate any long lines.  CSS
         // errors in particular share the memory for long lines with
         // repeated errors, but the IPC communication we're about to do
         // will break that sharing, so we better truncate now.
         if (sourceLine.Length() > 1000) {
             sourceLine.Truncate(1000);
         }
         rv = scriptError->GetCategory(getter_Copies(category));
         NS_ENSURE_SUCCESS(rv, rv);
         rv = scriptError->GetLineNumber(&lineNum);
         NS_ENSURE_SUCCESS(rv, rv);
         rv = scriptError->GetColumnNumber(&colNum);
         NS_ENSURE_SUCCESS(rv, rv);
         rv = scriptError->GetFlags(&flags);
         NS_ENSURE_SUCCESS(rv, rv);
         mChild->SendScriptError(msg, sourceName, sourceLine,
                                lineNum, colNum, flags, category);
         return NS_OK;
     }
     nsXPIDLString msg;
     nsresult rv = aMessage->GetMessageMoz(getter_Copies(msg));
     NS_ENSURE_SUCCESS(rv, rv);
     mChild->SendConsoleMessage(msg);
     return NS_OK;
 }
 class SystemMessageHandledObserver MOZ_FINAL : public nsIObserver
 {
 public:
     NS_DECL_ISUPPORTS
     NS_DECL_NSIOBSERVER
     void Init();
 };
 void SystemMessageHandledObserver::Init()
 {
     nsCOMPtr<nsIObserverService> os =
         mozilla::services::GetObserverService();
     if (os) {
         os->AddObserver(this, "handle-system-messages-done",
                         /* ownsWeak */ false);
     }
 }
 NS_IMETHODIMP
 SystemMessageHandledObserver::Observe(nsISupports* aSubject,
                                       const char* aTopic,
                                       const char16_t* aData)
 {
     if (ContentChild::GetSingleton()) {
         ContentChild::GetSingleton()->SendSystemMessageHandled();
     }
     return NS_OK;
 }
 NS_IMPL_ISUPPORTS(SystemMessageHandledObserver, nsIObserver)
 class BackgroundChildPrimer MOZ_FINAL :
   public nsIIPCBackgroundChildCreateCallback
 {
 public:
     BackgroundChildPrimer()
     { }
     NS_DECL_ISUPPORTS
 private:
     ~BackgroundChildPrimer()
     { }
     virtual void
     ActorCreated(PBackgroundChild* aActor) MOZ_OVERRIDE
     {
         MOZ_ASSERT(aActor, "Failed to create a PBackgroundChild actor!");
     }
     virtual void
     ActorFailed() MOZ_OVERRIDE
     {
         MOZ_CRASH("Failed to create a PBackgroundChild actor!");
     }
 };
 NS_IMPL_ISUPPORTS(BackgroundChildPrimer, nsIIPCBackgroundChildCreateCallback)
 ContentChild* ContentChild::sSingleton;
 // Performs initialization that is not fork-safe, i.e. that must be done after
 // forking from the Nuwa process.
 static void
 InitOnContentProcessCreated()
 {
     // This will register cross-process observer.
     mozilla::dom::time::InitializeDateCacheCleaner();
 }
 ContentChild::ContentChild()
  : mID(uint64_t(-1))
 #ifdef ANDROID
    ,mScreenSize(0, 0)
 #endif
    , mCanOverrideProcessName(true)
 {
     // This process is a content process, so it's clearly running in
     // multiprocess mode!
     nsDebugImpl::SetMultiprocessMode("Child");
 }
 ContentChild::~ContentChild()
 {
 }
 bool
 ContentChild::Init(MessageLoop* aIOLoop,
                    base::ProcessHandle aParentHandle,
                    IPC::Channel* aChannel)
 {
 #ifdef MOZ_WIDGET_GTK
     // sigh
     gtk_init(nullptr, nullptr);
 #endif
 #ifdef MOZ_WIDGET_QT
     // sigh, seriously
     nsQAppInstance::AddRef();
 #endif
 #ifdef MOZ_X11
     // Do this after initializing GDK, or GDK will install its own handler.
     XRE_InstallX11ErrorHandler();
 #endif
 #ifdef MOZ_NUWA_PROCESS
     SetTransport(aChannel);
 #endif
     NS_ASSERTION(!sSingleton, "only one ContentChild per child");
     // Once we start sending IPC messages, we need the thread manager to be
     // initialized so we can deal with the responses. Do that here before we
     // try to construct the crash reporter.
     nsresult rv = nsThreadManager::get()->Init();
     if (NS_WARN_IF(NS_FAILED(rv))) {
         return false;
     }
     Open(aChannel, aParentHandle, aIOLoop);
     sSingleton = this;
 #ifdef MOZ_X11
     // Send the parent our X socket to act as a proxy reference for our X
     // resources.
     int xSocketFd = ConnectionNumber(DefaultXDisplay());
     SendBackUpXResources(FileDescriptor(xSocketFd));
 #endif
 #ifdef MOZ_CRASHREPORTER
     SendPCrashReporterConstructor(CrashReporter::CurrentThreadId(),
                                   XRE_GetProcessType());
 #endif
     GetCPOWManager();
     InitProcessAttributes();
     return true;
 }
 void
 ContentChild::InitProcessAttributes()
 {
     SendGetProcessAttributes(&mID, &mIsForApp, &mIsForBrowser);
 #ifdef MOZ_NUWA_PROCESS
     if (IsNuwaProcess()) {
         SetProcessName(NS_LITERAL_STRING("(Nuwa)"), false);
         return;
     }
 #endif
     if (mIsForApp && !mIsForBrowser) {
         SetProcessName(NS_LITERAL_STRING("(Preallocated app)"), false);
     } else {
         SetProcessName(NS_LITERAL_STRING("Browser"), false);
     }
 }
 void
 ContentChild::SetProcessName(const nsAString& aName, bool aDontOverride)
 {
     if (!mCanOverrideProcessName) {
         return;
     }
     char* name;
     if ((name = PR_GetEnv("MOZ_DEBUG_APP_PROCESS")) &&
         aName.EqualsASCII(name)) {
 #ifdef OS_POSIX
         printf_stderr("\n\nCHILDCHILDCHILDCHILD\n  [%s] debug me @%d\n\n", name, getpid());
         sleep(30);
 #elif defined(OS_WIN)
         // Windows has a decent JIT debugging story, so NS_DebugBreak does the
         // right thing.
         NS_DebugBreak(NS_DEBUG_BREAK,
                       "Invoking NS_DebugBreak() to debug child process",
                       nullptr, __FILE__, __LINE__);
 #endif
     }
     mProcessName = aName;
     mozilla::ipc::SetThisProcessName(NS_LossyConvertUTF16toASCII(aName).get());
     if (aDontOverride) {
         mCanOverrideProcessName = false;
     }
 }
 void
 ContentChild::GetProcessName(nsAString& aName)
 {
     aName.Assign(mProcessName);
 }
 void
 ContentChild::GetProcessName(nsACString& aName)
 {
     aName.Assign(NS_ConvertUTF16toUTF8(mProcessName));
 }
 /* static */ void
 ContentChild::AppendProcessId(nsACString& aName)
 {
     if (!aName.IsEmpty()) {
         aName.AppendLiteral(" ");
     }
     unsigned pid = getpid();
     aName.Append(nsPrintfCString("(pid %u)", pid));
 }
 void
 ContentChild::InitXPCOM()
 {
     // Do this as early as possible to get the parent process to initialize the
     // background thread since we'll likely need database information very soon.
     BackgroundChild::Startup();
     nsCOMPtr<nsIIPCBackgroundChildCreateCallback> callback =
         new BackgroundChildPrimer();
     if (!BackgroundChild::GetOrCreateForCurrentThread(callback)) {
         MOZ_CRASH("Failed to create PBackgroundChild!");
     }
     nsCOMPtr<nsIConsoleService> svc(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
     if (!svc) {
         NS_WARNING("Couldn't acquire console service");
         return;
     }
     mConsoleListener = new ConsoleListener(this);
     if (NS_FAILED(svc->RegisterListener(mConsoleListener)))
         NS_WARNING("Couldn't register console listener for child process");
     bool isOffline;
     SendGetXPCOMProcessAttributes(&isOffline);
     RecvSetOffline(isOffline);
     DebugOnly<FileUpdateDispatcher*> observer = FileUpdateDispatcher::GetSingleton();
     NS_ASSERTION(observer, "FileUpdateDispatcher is null");
     // This object is held alive by the observer service.
     nsRefPtr<SystemMessageHandledObserver> sysMsgObserver =
         new SystemMessageHandledObserver();
     sysMsgObserver->Init();
 #ifndef MOZ_NUWA_PROCESS
     InitOnContentProcessCreated();
 #endif
 }
 PMemoryReportRequestChild*
 ContentChild::AllocPMemoryReportRequestChild(const uint32_t& generation,
                                              const bool &minimizeMemoryUsage,
                                              const nsString& aDMDDumpIdent)
 {
     MemoryReportRequestChild *actor = new MemoryReportRequestChild(generation, aDMDDumpIdent);
     actor->AddRef();
     return actor;
 }
 // This is just a wrapper for InfallibleTArray<MemoryReport> that implements
 // nsISupports, so it can be passed to nsIMemoryReporter::CollectReports.
 class MemoryReportsWrapper MOZ_FINAL : public nsISupports {
 public:
     NS_DECL_ISUPPORTS
     MemoryReportsWrapper(InfallibleTArray<MemoryReport> *r) : mReports(r) { }
     InfallibleTArray<MemoryReport> *mReports;
 };
 NS_IMPL_ISUPPORTS0(MemoryReportsWrapper)
 class MemoryReportCallback MOZ_FINAL : public nsIMemoryReporterCallback
 {
 public:
     NS_DECL_ISUPPORTS
     MemoryReportCallback(const nsACString &aProcess)
     : mProcess(aProcess)
     {
     }
     NS_IMETHOD Callback(const nsACString &aProcess, const nsACString &aPath,
                         int32_t aKind, int32_t aUnits, int64_t aAmount,
                         const nsACString &aDescription,
                         nsISupports *aiWrappedReports)
     {
         MemoryReportsWrapper *wrappedReports =
             static_cast<MemoryReportsWrapper *>(aiWrappedReports);
         MemoryReport memreport(mProcess, nsCString(aPath), aKind, aUnits,
                                aAmount, nsCString(aDescription));
         wrappedReports->mReports->AppendElement(memreport);
         return NS_OK;
     }
 private:
     const nsCString mProcess;
 };
 NS_IMPL_ISUPPORTS(
   MemoryReportCallback
 , nsIMemoryReporterCallback
 )
 bool
 ContentChild::RecvPMemoryReportRequestConstructor(
     PMemoryReportRequestChild* child,
     const uint32_t& generation,
     const bool& minimizeMemoryUsage,
     const nsString& aDMDDumpIdent)
 {
     MemoryReportRequestChild *actor = static_cast<MemoryReportRequestChild*>(child);
     nsresult rv;
     if (minimizeMemoryUsage) {
         nsCOMPtr<nsIMemoryReporterManager> mgr = do_GetService("@mozilla.org/memory-reporter-manager;1");
         rv = mgr->MinimizeMemoryUsage(actor);
         // mgr will eventually call actor->Run()
     } else {
         rv = actor->Run();
     }
     return !NS_WARN_IF(NS_FAILED(rv));
 }
 NS_IMETHODIMP MemoryReportRequestChild::Run()
 {
     ContentChild *child = static_cast<ContentChild*>(Manager());
     nsCOMPtr<nsIMemoryReporterManager> mgr = do_GetService("@mozilla.org/memory-reporter-manager;1");
     InfallibleTArray<MemoryReport> reports;
     nsCString process;
     child->GetProcessName(process);
     child->AppendProcessId(process);
     // Run the reporters.  The callback will turn each measurement into a
     // MemoryReport.
     nsRefPtr<MemoryReportsWrapper> wrappedReports =
         new MemoryReportsWrapper(&reports);
     nsRefPtr<MemoryReportCallback> cb = new MemoryReportCallback(process);
     mgr->GetReportsForThisProcessExtended(cb, wrappedReports, mDMDDumpIdent);
     bool sent = Send__delete__(this, mGeneration, reports);
     return sent ? NS_OK : NS_ERROR_FAILURE;
 }
 bool
 ContentChild::RecvAudioChannelNotify()
 {
     nsRefPtr<AudioChannelService> service =
         AudioChannelService::GetAudioChannelService();
     if (service) {
         service->Notify();
     }
     return true;
 }
 bool
 ContentChild::DeallocPMemoryReportRequestChild(PMemoryReportRequestChild* actor)
 {
     static_cast<MemoryReportRequestChild*>(actor)->Release();
     return true;
 }
 bool
 ContentChild::RecvDumpGCAndCCLogsToFile(const nsString& aIdentifier,
                                         const bool& aDumpAllTraces,
                                         const bool& aDumpChildProcesses)
 {
     nsCOMPtr<nsIMemoryInfoDumper> dumper = do_GetService("@mozilla.org/memory-info-dumper;1");
     nsString gcLogPath, ccLogPath;
     dumper->DumpGCAndCCLogsToFile(aIdentifier, aDumpAllTraces,
                                   aDumpChildProcesses, gcLogPath, ccLogPath);
     return true;
 }
 PCompositorChild*
 ContentChild::AllocPCompositorChild(mozilla::ipc::Transport* aTransport,
                                     base::ProcessId aOtherProcess)
 {
     return CompositorChild::Create(aTransport, aOtherProcess);
 }
 PImageBridgeChild*
 ContentChild::AllocPImageBridgeChild(mozilla::ipc::Transport* aTransport,
                                      base::ProcessId aOtherProcess)
 {
     return ImageBridgeChild::StartUpInChildProcess(aTransport, aOtherProcess);
 }
 PBackgroundChild*
 ContentChild::AllocPBackgroundChild(Transport* aTransport,
                                     ProcessId aOtherProcess)
 {
     return BackgroundChild::Alloc(aTransport, aOtherProcess);
 }
 bool
 ContentChild::RecvSetProcessSandbox()
 {
   // We may want to move the sandbox initialization somewhere else
   // at some point; see bug 880808.
 #if defined(MOZ_CONTENT_SANDBOX)
 #if defined(XP_LINUX)
   SetCurrentProcessSandbox();
 #elif defined(XP_WIN)
   mozilla::SandboxTarget::Instance()->StartSandbox();
 #endif
 #endif
   return true;
 }
 bool
 ContentChild::RecvSpeakerManagerNotify()
 {
 #ifdef MOZ_WIDGET_GONK
   nsRefPtr<SpeakerManagerService> service =
     SpeakerManagerService::GetSpeakerManagerService();
   if (service) {
     service->Notify();
   }
   return true;
 #endif
   return false;
 }
 static CancelableTask* sFirstIdleTask;
 static void FirstIdle(void)
 {
     MOZ_ASSERT(sFirstIdleTask);
     sFirstIdleTask = nullptr;
     ContentChild::GetSingleton()->SendFirstIdle();
 }
 mozilla::jsipc::PJavaScriptChild *
 ContentChild::AllocPJavaScriptChild()
 {
     nsCOMPtr<nsIJSRuntimeService> svc = do_GetService("@mozilla.org/js/xpc/RuntimeService;1");
     NS_ENSURE_TRUE(svc, nullptr);
     JSRuntime *rt;
     svc->GetRuntime(&rt);
     NS_ENSURE_TRUE(svc, nullptr);
     mozilla::jsipc::JavaScriptChild *child = new mozilla::jsipc::JavaScriptChild(rt);
     if (!child->init()) {
         delete child;
         return nullptr;
     }
     return child;
 }
 bool
 ContentChild::DeallocPJavaScriptChild(PJavaScriptChild *child)
 {
     delete child;
     return true;
 }
 PBrowserChild*
 ContentChild::AllocPBrowserChild(const IPCTabContext& aContext,
                                  const uint32_t& aChromeFlags)
 {
     // We'll happily accept any kind of IPCTabContext here; we don't need to
     // check that it's of a certain type for security purposes, because we
     // believe whatever the parent process tells us.
     MaybeInvalidTabContext tc(aContext);
     if (!tc.IsValid()) {
         NS_ERROR(nsPrintfCString("Received an invalid TabContext from "
                                  "the parent process. (%s)  Crashing...",
                                  tc.GetInvalidReason()).get());
         MOZ_CRASH("Invalid TabContext received from the parent process.");
     }
     nsRefPtr<TabChild> child = TabChild::Create(this, tc.GetTabContext(), aChromeFlags);
     // The ref here is released in DeallocPBrowserChild.
     return child.forget().take();
 }
 bool
 ContentChild::RecvPBrowserConstructor(PBrowserChild* actor,
                                       const IPCTabContext& context,
                                       const uint32_t& chromeFlags)
 {
     // This runs after AllocPBrowserChild() returns and the IPC machinery for this
     // PBrowserChild has been set up.
     nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     if (os) {
         nsITabChild* tc =
             static_cast<nsITabChild*>(static_cast<TabChild*>(actor));
         os->NotifyObservers(tc, "tab-child-created", nullptr);
     }
     static bool hasRunOnce = false;
     if (!hasRunOnce) {
         hasRunOnce = true;
         MOZ_ASSERT(!sFirstIdleTask);
         sFirstIdleTask = NewRunnableFunction(FirstIdle);
         MessageLoop::current()->PostIdleTask(FROM_HERE, sFirstIdleTask);
         // Redo InitProcessAttributes() when the app or browser is really
         // launching so the attributes will be correct.
         InitProcessAttributes();
     }
     return true;
 }
 PFileDescriptorSetChild*
 ContentChild::AllocPFileDescriptorSetChild(const FileDescriptor& aFD)
 {
     return new FileDescriptorSetChild(aFD);
 }
 bool
 ContentChild::DeallocPFileDescriptorSetChild(PFileDescriptorSetChild* aActor)
 {
     delete static_cast<FileDescriptorSetChild*>(aActor);
     return true;
 }
 bool
 ContentChild::DeallocPBrowserChild(PBrowserChild* iframe)
 {
     TabChild* child = static_cast<TabChild*>(iframe);
     NS_RELEASE(child);
     return true;
 }
 PBlobChild*
 ContentChild::AllocPBlobChild(const BlobConstructorParams& aParams)
 {
   return BlobChild::Create(this, aParams);
 }
 bool
 ContentChild::DeallocPBlobChild(PBlobChild* aActor)
 {
   delete aActor;
   return true;
 }
 BlobChild*
 ContentChild::GetOrCreateActorForBlob(nsIDOMBlob* aBlob)
 {
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(aBlob);
   // If the blob represents a remote blob then we can simply pass its actor back
   // here.
   if (nsCOMPtr<nsIRemoteBlob> remoteBlob = do_QueryInterface(aBlob)) {
     BlobChild* actor =
       static_cast<BlobChild*>(
         static_cast<PBlobChild*>(remoteBlob->GetPBlob()));
     MOZ_ASSERT(actor);
     return actor;
   }
   // XXX This is only safe so long as all blob implementations in our tree
   //     inherit nsDOMFileBase. If that ever changes then this will need to grow
   //     a real interface or something.
   const nsDOMFileBase* blob = static_cast<nsDOMFileBase*>(aBlob);
   // We often pass blobs that are multipart but that only contain one sub-blob
   // (WebActivities does this a bunch). Unwrap to reduce the number of actors
   // that we have to maintain.
   const nsTArray<nsCOMPtr<nsIDOMBlob> >* subBlobs = blob->GetSubBlobs();
   if (subBlobs && subBlobs->Length() == 1) {
     const nsCOMPtr<nsIDOMBlob>& subBlob = subBlobs->ElementAt(0);
     MOZ_ASSERT(subBlob);
     // We can only take this shortcut if the multipart and the sub-blob are both
     // Blob objects or both File objects.
     nsCOMPtr<nsIDOMFile> multipartBlobAsFile = do_QueryInterface(aBlob);
     nsCOMPtr<nsIDOMFile> subBlobAsFile = do_QueryInterface(subBlob);
     if (!multipartBlobAsFile == !subBlobAsFile) {
       // The wrapping was unnecessary, see if we can simply pass an existing
       // remote blob.
       if (nsCOMPtr<nsIRemoteBlob> remoteBlob = do_QueryInterface(subBlob)) {
         BlobChild* actor =
           static_cast<BlobChild*>(
             static_cast<PBlobChild*>(remoteBlob->GetPBlob()));
         MOZ_ASSERT(actor);
         return actor;
       }
       // No need to add a reference here since the original blob must have a
       // strong reference in the caller and it must also have a strong reference
       // to this sub-blob.
       aBlob = subBlob;
       blob = static_cast<nsDOMFileBase*>(aBlob);
       subBlobs = blob->GetSubBlobs();
     }
   }
   // All blobs shared between processes must be immutable.
   nsCOMPtr<nsIMutable> mutableBlob = do_QueryInterface(aBlob);
   if (!mutableBlob || NS_FAILED(mutableBlob->SetMutable(false))) {
     NS_WARNING("Failed to make blob immutable!");
     return nullptr;
   }
   ParentBlobConstructorParams params;
   if (blob->IsSizeUnknown() || blob->IsDateUnknown()) {
     // We don't want to call GetSize or GetLastModifiedDate
     // yet since that may stat a file on the main thread
     // here. Instead we'll learn the size lazily from the
     // other process.
     params.blobParams() = MysteryBlobConstructorParams();
     params.optionalInputStreamParams() = void_t();
   }
   else {
     nsString contentType;
     nsresult rv = aBlob->GetType(contentType);
     NS_ENSURE_SUCCESS(rv, nullptr);
     uint64_t length;
     rv = aBlob->GetSize(&length);
     NS_ENSURE_SUCCESS(rv, nullptr);
     nsCOMPtr<nsIInputStream> stream;
     rv = aBlob->GetInternalStream(getter_AddRefs(stream));
     NS_ENSURE_SUCCESS(rv, nullptr);
     InputStreamParams inputStreamParams;
     nsTArray<mozilla::ipc::FileDescriptor> fds;
     SerializeInputStream(stream, inputStreamParams, fds);
     MOZ_ASSERT(fds.IsEmpty());
     params.optionalInputStreamParams() = inputStreamParams;
     nsCOMPtr<nsIDOMFile> file = do_QueryInterface(aBlob);
     if (file) {
       FileBlobConstructorParams fileParams;
       rv = file->GetName(fileParams.name());
       NS_ENSURE_SUCCESS(rv, nullptr);
       rv = file->GetMozLastModifiedDate(&fileParams.modDate());
       NS_ENSURE_SUCCESS(rv, nullptr);
       fileParams.contentType() = contentType;
       fileParams.length() = length;
       params.blobParams() = fileParams;
     } else {
       NormalBlobConstructorParams blobParams;
       blobParams.contentType() = contentType;
       blobParams.length() = length;
       params.blobParams() = blobParams;
     }
   }
   BlobChild* actor = BlobChild::Create(this, aBlob);
   NS_ENSURE_TRUE(actor, nullptr);
   return SendPBlobConstructor(actor, params) ? actor : nullptr;
 }
 PCrashReporterChild*
 ContentChild::AllocPCrashReporterChild(const mozilla::dom::NativeThreadId& id,
                                        const uint32_t& processType)
 {
 #ifdef MOZ_CRASHREPORTER
     return new CrashReporterChild();
 #else
     return nullptr;
 #endif
 }
 bool
 ContentChild::DeallocPCrashReporterChild(PCrashReporterChild* crashreporter)
 {
     delete crashreporter;
     return true;
 }
 PHalChild*
 ContentChild::AllocPHalChild()
 {
     return CreateHalChild();
 }
 bool
 ContentChild::DeallocPHalChild(PHalChild* aHal)
 {
     delete aHal;
     return true;
 }
 PIndexedDBChild*
 ContentChild::AllocPIndexedDBChild()
 {
   NS_NOTREACHED("Should never get here!");
   return nullptr;
 }
 bool
 ContentChild::DeallocPIndexedDBChild(PIndexedDBChild* aActor)
 {
   delete aActor;
   return true;
 }
 asmjscache::PAsmJSCacheEntryChild*
 ContentChild::AllocPAsmJSCacheEntryChild(
                                     const asmjscache::OpenMode& aOpenMode,
                                     const asmjscache::WriteParams& aWriteParams,
                                     const IPC::Principal& aPrincipal)
 {
   NS_NOTREACHED("Should never get here!");
   return nullptr;
 }
 bool
 ContentChild::DeallocPAsmJSCacheEntryChild(PAsmJSCacheEntryChild* aActor)
 {
   asmjscache::DeallocEntryChild(aActor);
   return true;
 }
 PTestShellChild*
 ContentChild::AllocPTestShellChild()
 {
     return new TestShellChild();
 }
 bool
 ContentChild::DeallocPTestShellChild(PTestShellChild* shell)
 {
     delete shell;
     return true;
 }
 jsipc::JavaScriptChild *
 ContentChild::GetCPOWManager()
 {
     if (ManagedPJavaScriptChild().Length()) {
         return static_cast<JavaScriptChild*>(ManagedPJavaScriptChild()[0]);
     }
     JavaScriptChild* actor = static_cast<JavaScriptChild*>(SendPJavaScriptConstructor());
     return actor;
 }
 bool
 ContentChild::RecvPTestShellConstructor(PTestShellChild* actor)
 {
     return true;
 }
 PDeviceStorageRequestChild*
 ContentChild::AllocPDeviceStorageRequestChild(const DeviceStorageParams& aParams)
 {
     return new DeviceStorageRequestChild();
 }
 bool
 ContentChild::DeallocPDeviceStorageRequestChild(PDeviceStorageRequestChild* aDeviceStorage)
 {
     delete aDeviceStorage;
     return true;
 }
 PFileSystemRequestChild*
 ContentChild::AllocPFileSystemRequestChild(const FileSystemParams& aParams)
 {
     NS_NOTREACHED("Should never get here!");
     return nullptr;
 }
 bool
 ContentChild::DeallocPFileSystemRequestChild(PFileSystemRequestChild* aFileSystem)
 {
     mozilla::dom::FileSystemTaskBase* child =
       static_cast<mozilla::dom::FileSystemTaskBase*>(aFileSystem);
     // The reference is increased in FileSystemTaskBase::Start of
     // FileSystemTaskBase.cpp. We should decrease it after IPC.
     NS_RELEASE(child);
     return true;
 }
 PNeckoChild*
 ContentChild::AllocPNeckoChild()
 {
     return new NeckoChild();
 }
 bool
 ContentChild::DeallocPNeckoChild(PNeckoChild* necko)
 {
     delete necko;
     return true;
 }
 PExternalHelperAppChild*
 ContentChild::AllocPExternalHelperAppChild(const OptionalURIParams& uri,
                                            const nsCString& aMimeContentType,
                                            const nsCString& aContentDisposition,
                                            const uint32_t& aContentDispositionHint,
                                            const nsString& aContentDispositionFilename,
                                            const bool& aForceSave,
                                            const int64_t& aContentLength,
                                            const OptionalURIParams& aReferrer,
                                            PBrowserChild* aBrowser)
 {
     ExternalHelperAppChild *child = new ExternalHelperAppChild();
     child->AddRef();
     return child;
 }
 bool
 ContentChild::DeallocPExternalHelperAppChild(PExternalHelperAppChild* aService)
 {
     ExternalHelperAppChild *child = static_cast<ExternalHelperAppChild*>(aService);
     child->Release();
     return true;
 }
 PSmsChild*
 ContentChild::AllocPSmsChild()
 {
     return new SmsChild();
 }
 bool
 ContentChild::DeallocPSmsChild(PSmsChild* aSms)
 {
     delete aSms;
     return true;
 }
 PTelephonyChild*
 ContentChild::AllocPTelephonyChild()
 {
     MOZ_CRASH("No one should be allocating PTelephonyChild actors");
 }
 bool
 ContentChild::DeallocPTelephonyChild(PTelephonyChild* aActor)
 {
     delete aActor;
     return true;
 }
 PStorageChild*
 ContentChild::AllocPStorageChild()
 {
     NS_NOTREACHED("We should never be manually allocating PStorageChild actors");
     return nullptr;
 }
 bool
 ContentChild::DeallocPStorageChild(PStorageChild* aActor)
 {
     DOMStorageDBChild* child = static_cast<DOMStorageDBChild*>(aActor);
     child->ReleaseIPDLReference();
     return true;
 }
 PBluetoothChild*
 ContentChild::AllocPBluetoothChild()
 {
 #ifdef MOZ_B2G_BT
     MOZ_CRASH("No one should be allocating PBluetoothChild actors");
 #else
     MOZ_CRASH("No support for bluetooth on this platform!");
 #endif
 }
 bool
 ContentChild::DeallocPBluetoothChild(PBluetoothChild* aActor)
 {
 #ifdef MOZ_B2G_BT
     delete aActor;
     return true;
 #else
     MOZ_CRASH("No support for bluetooth on this platform!");
 #endif
 }
 PFMRadioChild*
 ContentChild::AllocPFMRadioChild()
 {
 #ifdef MOZ_B2G_FM
     NS_RUNTIMEABORT("No one should be allocating PFMRadioChild actors");
     return nullptr;
 #else
     NS_RUNTIMEABORT("No support for FMRadio on this platform!");
     return nullptr;
 #endif
 }
 bool
 ContentChild::DeallocPFMRadioChild(PFMRadioChild* aActor)
 {
 #ifdef MOZ_B2G_FM
     delete aActor;
     return true;
 #else
     NS_RUNTIMEABORT("No support for FMRadio on this platform!");
     return false;
 #endif
 }
 PSpeechSynthesisChild*
 ContentChild::AllocPSpeechSynthesisChild()
 {
 #ifdef MOZ_WEBSPEECH
     MOZ_CRASH("No one should be allocating PSpeechSynthesisChild actors");
 #else
     return nullptr;
 #endif
 }
 bool
 ContentChild::DeallocPSpeechSynthesisChild(PSpeechSynthesisChild* aActor)
 {
 #ifdef MOZ_WEBSPEECH
     delete aActor;
     return true;
 #else
     return false;
 #endif
 }
 bool
 ContentChild::RecvRegisterChrome(const InfallibleTArray<ChromePackage>& packages,
                                  const InfallibleTArray<ResourceMapping>& resources,
                                  const InfallibleTArray<OverrideMapping>& overrides,
                                  const nsCString& locale)
 {
     nsCOMPtr<nsIChromeRegistry> registrySvc = nsChromeRegistry::GetService();
     nsChromeRegistryContent* chromeRegistry =
         static_cast<nsChromeRegistryContent*>(registrySvc.get());
     chromeRegistry->RegisterRemoteChrome(packages, resources, overrides, locale);
     return true;
 }
 bool
 ContentChild::RecvSetOffline(const bool& offline)
 {
   nsCOMPtr<nsIIOService> io (do_GetIOService());
   NS_ASSERTION(io, "IO Service can not be null");
   io->SetOffline(offline);
   return true;
 }
 void
 ContentChild::ActorDestroy(ActorDestroyReason why)
 {
     if (AbnormalShutdown == why) {
         NS_WARNING("shutting down early because of crash!");
         QuickExit();
     }
 #ifndef DEBUG
     // In release builds, there's no point in the content process
     // going through the full XPCOM shutdown path, because it doesn't
     // keep persistent state.
     QuickExit();
 #endif
     if (sFirstIdleTask) {
         sFirstIdleTask->Cancel();
     }
     mAlertObservers.Clear();
     mIdleObservers.Clear();
     nsCOMPtr<nsIConsoleService> svc(do_GetService(NS_CONSOLESERVICE_CONTRACTID));
     if (svc) {
         svc->UnregisterListener(mConsoleListener);
         mConsoleListener->mChild = nullptr;
     }
     XRE_ShutdownChildProcess();
 }
 void
 ContentChild::ProcessingError(Result what)
 {
     switch (what) {
     case MsgDropped:
         QuickExit();
     case MsgNotKnown:
         NS_RUNTIMEABORT("aborting because of MsgNotKnown");
     case MsgNotAllowed:
         NS_RUNTIMEABORT("aborting because of MsgNotAllowed");
     case MsgPayloadError:
         NS_RUNTIMEABORT("aborting because of MsgPayloadError");
     case MsgProcessingError:
         NS_RUNTIMEABORT("aborting because of MsgProcessingError");
     case MsgRouteError:
         NS_RUNTIMEABORT("aborting because of MsgRouteError");
     case MsgValueError:
         NS_RUNTIMEABORT("aborting because of MsgValueError");
     default:
         NS_RUNTIMEABORT("not reached");
     }
 }
 void
 ContentChild::QuickExit()
 {
     NS_WARNING("content process _exit()ing");
     _exit(0);
 }
 nsresult
 ContentChild::AddRemoteAlertObserver(const nsString& aData,
                                      nsIObserver* aObserver)
 {
     NS_ASSERTION(aObserver, "Adding a null observer?");
     mAlertObservers.AppendElement(new AlertObserver(aObserver, aData));
     return NS_OK;
 }
 bool
 ContentChild::RecvPreferenceUpdate(const PrefSetting& aPref)
 {
     Preferences::SetPreference(aPref);
     return true;
 }
 bool
 ContentChild::RecvNotifyAlertsObserver(const nsCString& aType, const nsString& aData)
 {
     for (uint32_t i = 0; i < mAlertObservers.Length();
          /*we mutate the array during the loop; ++i iff no mutation*/) {
         AlertObserver* observer = mAlertObservers[i];
         if (observer->Observes(aData) && observer->Notify(aType)) {
             // if aType == alertfinished, this alert is done.  we can
             // remove the observer.
             if (aType.Equals(nsDependentCString("alertfinished"))) {
                 mAlertObservers.RemoveElementAt(i);
                 continue;
             }
         }
         ++i;
     }
     return true;
 }
 bool
 ContentChild::RecvNotifyVisited(const URIParams& aURI)
 {
     nsCOMPtr<nsIURI> newURI = DeserializeURI(aURI);
     if (!newURI) {
         return false;
     }
     nsCOMPtr<IHistory> history = services::GetHistoryService();
     if (history) {
       history->NotifyVisited(newURI);
     }
     return true;
 }
 bool
 ContentChild::RecvAsyncMessage(const nsString& aMsg,
                                const ClonedMessageData& aData,
                                const InfallibleTArray<CpowEntry>& aCpows,
                                const IPC::Principal& aPrincipal)
 {
   nsRefPtr<nsFrameMessageManager> cpm = nsFrameMessageManager::sChildProcessManager;
   if (cpm) {
     StructuredCloneData cloneData = ipc::UnpackClonedMessageDataForChild(aData);
     CpowIdHolder cpows(GetCPOWManager(), aCpows);
     cpm->ReceiveMessage(static_cast<nsIContentFrameMessageManager*>(cpm.get()),
                         aMsg, false, &cloneData, &cpows, aPrincipal, nullptr);
   }
   return true;
 }
 bool
 ContentChild::RecvGeolocationUpdate(const GeoPosition& somewhere)
 {
   nsCOMPtr<nsIGeolocationUpdate> gs = do_GetService("@mozilla.org/geolocation/service;1");
   if (!gs) {
     return true;
   }
   nsCOMPtr<nsIDOMGeoPosition> position = somewhere;
   gs->Update(position);
   return true;
 }
 bool
 ContentChild::RecvAddPermission(const IPC::Permission& permission)
 {
 #if MOZ_PERMISSIONS
   nsCOMPtr<nsIPermissionManager> permissionManagerIface =
       do_GetService(NS_PERMISSIONMANAGER_CONTRACTID);
   nsPermissionManager* permissionManager =
       static_cast<nsPermissionManager*>(permissionManagerIface.get());
   NS_ABORT_IF_FALSE(permissionManager,
                    "We have no permissionManager in the Content process !");
   nsCOMPtr<nsIURI> uri;
   NS_NewURI(getter_AddRefs(uri), NS_LITERAL_CSTRING("http://") + nsCString(permission.host));
   NS_ENSURE_TRUE(uri, true);
   nsIScriptSecurityManager* secMan = nsContentUtils::GetSecurityManager();
   MOZ_ASSERT(secMan);
   nsCOMPtr<nsIPrincipal> principal;
   nsresult rv = secMan->GetAppCodebasePrincipal(uri, permission.appId,
                                                 permission.isInBrowserElement,
                                                 getter_AddRefs(principal));
   NS_ENSURE_SUCCESS(rv, true);
   permissionManager->AddInternal(principal,
                                  nsCString(permission.type),
                                  permission.capability,
 ,
                                  permission.expireType,
                                  permission.expireTime,
                                  nsPermissionManager::eNotify,
                                  nsPermissionManager::eNoDBOperation);
 #endif
   return true;
 }
 bool
 ContentChild::RecvScreenSizeChanged(const gfxIntSize& size)
 {
 #ifdef ANDROID
     mScreenSize = size;
 #else
     NS_RUNTIMEABORT("Message currently only expected on android");
 #endif
   return true;
 }
 bool
 ContentChild::RecvFlushMemory(const nsString& reason)
 {
 #ifdef MOZ_NUWA_PROCESS
     if (IsNuwaProcess()) {
         // Don't flush memory in the nuwa process: the GC thread could be frozen.
         return true;
     }
 #endif
     nsCOMPtr<nsIObserverService> os =
         mozilla::services::GetObserverService();
     if (os)
         os->NotifyObservers(nullptr, "memory-pressure", reason.get());
     return true;
 }
 bool
 ContentChild::RecvActivateA11y()
 {
 #ifdef ACCESSIBILITY
     // Start accessibility in content process if it's running in chrome
     // process.
     nsCOMPtr<nsIAccessibilityService> accService =
         do_GetService("@mozilla.org/accessibilityService;1");
 #endif
     return true;
 }
 bool
 ContentChild::RecvGarbageCollect()
 {
     // Rebroadcast the "child-gc-request" so that workers will GC.
     nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
     if (obs) {
         obs->NotifyObservers(nullptr, "child-gc-request", nullptr);
     }
     nsJSContext::GarbageCollectNow(JS::gcreason::DOM_IPC);
     return true;
 }
 bool
 ContentChild::RecvCycleCollect()
 {
     // Rebroadcast the "child-cc-request" so that workers will CC.
     nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
     if (obs) {
         obs->NotifyObservers(nullptr, "child-cc-request", nullptr);
     }
     nsJSContext::CycleCollectNow();
     return true;
 }
 #ifdef MOZ_NUWA_PROCESS
 static void
 OnFinishNuwaPreparation ()
 {
     MakeNuwaProcess();
 }
 #endif
 static void
 PreloadSlowThings()
 {
     // This fetches and creates all the built-in stylesheets.
     nsLayoutStylesheetCache::UserContentSheet();
     TabChild::PreloadSlowThings();
 }
 bool
 ContentChild::RecvAppInfo(const nsCString& version, const nsCString& buildID,
                           const nsCString& name, const nsCString& UAName)
 {
     mAppInfo.version.Assign(version);
     mAppInfo.buildID.Assign(buildID);
     mAppInfo.name.Assign(name);
     mAppInfo.UAName.Assign(UAName);
     if (!Preferences::GetBool("dom.ipc.processPrelaunch.enabled", false)) {
         return true;
     }
     // If we're part of the mozbrowser machinery, go ahead and start
     // preloading things.  We can only do this for mozbrowser because
     // PreloadSlowThings() may set the docshell of the first TabChild
     // inactive, and we can only safely restore it to active from
     // BrowserElementChild.js.
     if ((mIsForApp || mIsForBrowser)
 #ifdef MOZ_NUWA_PROCESS
         && !IsNuwaProcess()
 #endif
        ) {
         PreloadSlowThings();
     }
 #ifdef MOZ_NUWA_PROCESS
     if (IsNuwaProcess()) {
         ContentChild::GetSingleton()->RecvGarbageCollect();
         MessageLoop::current()->PostTask(
             FROM_HERE, NewRunnableFunction(OnFinishNuwaPreparation));
     }
 #endif
     return true;
 }
 bool
 ContentChild::RecvLastPrivateDocShellDestroyed()
 {
     nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
     obs->NotifyObservers(nullptr, "last-pb-context-exited", nullptr);
     return true;
 }
 bool
 ContentChild::RecvFilePathUpdate(const nsString& aStorageType,
                                  const nsString& aStorageName,
                                  const nsString& aPath,
                                  const nsCString& aReason)
 {
     nsRefPtr<DeviceStorageFile> dsf = new DeviceStorageFile(aStorageType, aStorageName, aPath);
     nsString reason;
     CopyASCIItoUTF16(aReason, reason);
     nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
     obs->NotifyObservers(dsf, "file-watcher-update", reason.get());
     return true;
 }
 bool
 ContentChild::RecvFileSystemUpdate(const nsString& aFsName,
                                    const nsString& aVolumeName,
                                    const int32_t& aState,
                                    const int32_t& aMountGeneration,
                                    const bool& aIsMediaPresent,
                                    const bool& aIsSharing,
                                    const bool& aIsFormatting)
 {
 #ifdef MOZ_WIDGET_GONK
     nsRefPtr<nsVolume> volume = new nsVolume(aFsName, aVolumeName, aState,
                                              aMountGeneration, aIsMediaPresent,
                                              aIsSharing, aIsFormatting);
     nsRefPtr<nsVolumeService> vs = nsVolumeService::GetSingleton();
     if (vs) {
         vs->UpdateVolume(volume);
     }
 #else
     // Remove warnings about unused arguments
     unused << aFsName;
     unused << aVolumeName;
     unused << aState;
     unused << aMountGeneration;
     unused << aIsMediaPresent;
     unused << aIsSharing;
     unused << aIsFormatting;
 #endif
     return true;
 }
 bool
 ContentChild::RecvNotifyProcessPriorityChanged(
     const hal::ProcessPriority& aPriority)
 {
     nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     NS_ENSURE_TRUE(os, true);
     nsRefPtr<nsHashPropertyBag> props = new nsHashPropertyBag();
     props->SetPropertyAsInt32(NS_LITERAL_STRING("priority"),
                               static_cast<int32_t>(aPriority));
     os->NotifyObservers(static_cast<nsIPropertyBag2*>(props),
                         "ipc:process-priority-changed",  nullptr);
     return true;
 }
 bool
 ContentChild::RecvMinimizeMemoryUsage()
 {
 #ifdef MOZ_NUWA_PROCESS
     if (IsNuwaProcess()) {
         // Don't minimize memory in the nuwa process: it will perform GC, but the
         // GC thread could be frozen.
         return true;
     }
 #endif
     nsCOMPtr<nsIMemoryReporterManager> mgr =
         do_GetService("@mozilla.org/memory-reporter-manager;1");
     NS_ENSURE_TRUE(mgr, true);
     mgr->MinimizeMemoryUsage(/* callback = */ nullptr);
     return true;
 }
 bool
 ContentChild::RecvNotifyPhoneStateChange(const nsString& aState)
 {
   nsCOMPtr<nsIObserverService> os = services::GetObserverService();
   if (os) {
     os->NotifyObservers(nullptr, "phone-state-changed", aState.get());
   }
   return true;
 }
 void
 ContentChild::AddIdleObserver(nsIObserver* aObserver, uint32_t aIdleTimeInS)
 {
   MOZ_ASSERT(aObserver, "null idle observer");
   // Make sure aObserver isn't released while we wait for the parent
   aObserver->AddRef();
   SendAddIdleObserver(reinterpret_cast<uint64_t>(aObserver), aIdleTimeInS);
   mIdleObservers.PutEntry(aObserver);
 }
 void
 ContentChild::RemoveIdleObserver(nsIObserver* aObserver, uint32_t aIdleTimeInS)
 {
   MOZ_ASSERT(aObserver, "null idle observer");
   SendRemoveIdleObserver(reinterpret_cast<uint64_t>(aObserver), aIdleTimeInS);
   aObserver->Release();
   mIdleObservers.RemoveEntry(aObserver);
 }
 bool
 ContentChild::RecvNotifyIdleObserver(const uint64_t& aObserver,
                                      const nsCString& aTopic,
                                      const nsString& aTimeStr)
 {
   nsIObserver* observer = reinterpret_cast<nsIObserver*>(aObserver);
   if (mIdleObservers.Contains(observer)) {
     observer->Observe(nullptr, aTopic.get(), aTimeStr.get());
   } else {
     NS_WARNING("Received notification for an idle observer that was removed.");
   }
   return true;
 }
 bool
 ContentChild::RecvLoadAndRegisterSheet(const URIParams& aURI, const uint32_t& aType)
 {
     nsCOMPtr<nsIURI> uri = DeserializeURI(aURI);
     if (!uri) {
         return true;
     }
     nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
     if (sheetService) {
         sheetService->LoadAndRegisterSheet(uri, aType);
     }
     return true;
 }
 bool
 ContentChild::RecvUnregisterSheet(const URIParams& aURI, const uint32_t& aType)
 {
     nsCOMPtr<nsIURI> uri = DeserializeURI(aURI);
     if (!uri) {
         return true;
     }
     nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
     if (sheetService) {
         sheetService->UnregisterSheet(uri, aType);
     }
     return true;
 }
 #ifdef MOZ_NUWA_PROCESS
 class CallNuwaSpawn : public nsRunnable
 {
 public:
     NS_IMETHOD Run()
     {
         NuwaSpawn();
         if (IsNuwaProcess()) {
             return NS_OK;
         }
         // In the new process.
         ContentChild* child = ContentChild::GetSingleton();
         child->SetProcessName(NS_LITERAL_STRING("(Preallocated app)"), false);
         mozilla::ipc::Transport* transport = child->GetTransport();
         int fd = transport->GetFileDescriptor();
         transport->ResetFileDescriptor(fd);
         IToplevelProtocol* toplevel = child->GetFirstOpenedActors();
         while (toplevel != nullptr) {
             transport = toplevel->GetTransport();
             fd = transport->GetFileDescriptor();
             transport->ResetFileDescriptor(fd);
             toplevel = toplevel->getNext();
         }
         // Perform other after-fork initializations.
         InitOnContentProcessCreated();
         return NS_OK;
     }
 };
 static void
 DoNuwaFork()
 {
     NS_ASSERTION(NuwaSpawnPrepare != nullptr,
                  "NuwaSpawnPrepare() is not available!");
     NuwaSpawnPrepare();       // NuwaSpawn will be blocked.
     {
         nsCOMPtr<nsIRunnable> callSpawn(new CallNuwaSpawn());
         NS_DispatchToMainThread(callSpawn);
     }
     // IOThread should be blocked here for waiting NuwaSpawn().
     NS_ASSERTION(NuwaSpawnWait != nullptr,
                  "NuwaSpawnWait() is not available!");
     NuwaSpawnWait();        // Now! NuwaSpawn can go.
     // Here, we can make sure the spawning was finished.
 }
 /**
  * This function should keep IO thread in a stable state and freeze it
  * until the spawning is finished.
  */
 static void
 RunNuwaFork()
 {
     if (NuwaCheckpointCurrentThread()) {
       DoNuwaFork();
     }
 }
 #endif
 bool
 ContentChild::RecvNuwaFork()
 {
 #ifdef MOZ_NUWA_PROCESS
     if (sNuwaForking) {           // No reentry.
         return true;
     }
     sNuwaForking = true;
     // We want to ensure that the PBackground actor gets cloned in the Nuwa
     // process before we freeze. Also, we have to do this to avoid deadlock.
     // Protocols that are "opened" (e.g. PBackground, PCompositor) block the
     // main thread to wait for the IPC thread during the open operation.
     // NuwaSpawnWait() blocks the IPC thread to wait for the main thread when
     // the Nuwa process is forked. Unless we ensure that the two cannot happen
     // at the same time then we risk deadlock. Spinning the event loop here
     // guarantees the ordering is safe for PBackground.
     while (!BackgroundChild::GetForCurrentThread()) {
         if (NS_WARN_IF(!NS_ProcessNextEvent())) {
             return false;
         }
     }
     MessageLoop* ioloop = XRE_GetIOMessageLoop();
     ioloop->PostTask(FROM_HERE, NewRunnableFunction(RunNuwaFork));
     return true;
 #else
     return false; // Makes the underlying IPC channel abort.
 #endif
 }
 } // namespace dom
 } // namespace mozilla
 extern "C" {
 #if defined(MOZ_NUWA_PROCESS)
 NS_EXPORT void
 GetProtoFdInfos(NuwaProtoFdInfo* aInfoList,
                 size_t aInfoListSize,
                 size_t* aInfoSize)
 {
     size_t i = 0;
     mozilla::dom::ContentChild* content =
         mozilla::dom::ContentChild::GetSingleton();
     aInfoList[i].protoId = content->GetProtocolId();
     aInfoList[i].originFd =
         content->GetTransport()->GetFileDescriptor();
     i++;
     for (IToplevelProtocol* actor = content->GetFirstOpenedActors();
          actor != nullptr;
          actor = actor->getNext()) {
         if (i >= aInfoListSize) {
             NS_RUNTIMEABORT("Too many top level protocols!");
         }
         aInfoList[i].protoId = actor->GetProtocolId();
         aInfoList[i].originFd =
             actor->GetTransport()->GetFileDescriptor();
         i++;
     }
     if (i > NUWA_TOPLEVEL_MAX) {
         NS_RUNTIMEABORT("Too many top level protocols!");
     }
     *aInfoSize = i;
 }
 class RunAddNewIPCProcess : public nsRunnable
 {
 public:
     RunAddNewIPCProcess(pid_t aPid,
                         nsTArray<mozilla::ipc::ProtocolFdMapping>& aMaps)
         : mPid(aPid)
     {
         mMaps.SwapElements(aMaps);
     }
     NS_IMETHOD Run()
     {
         mozilla::dom::ContentChild::GetSingleton()->
             SendAddNewProcess(mPid, mMaps);
         MOZ_ASSERT(sNuwaForking);
         sNuwaForking = false;
         return NS_OK;
     }
 private:
     pid_t mPid;
     nsTArray<mozilla::ipc::ProtocolFdMapping> mMaps;
 };
 /**
  * AddNewIPCProcess() is called by Nuwa process to tell the parent
  * process that a new process is created.
  *
  * In the newly created process, ResetContentChildTransport() is called to
  * reset fd for the IPC Channel and the session.
  */
 NS_EXPORT void
 AddNewIPCProcess(pid_t aPid, NuwaProtoFdInfo* aInfoList, size_t aInfoListSize)
 {
     nsTArray<mozilla::ipc::ProtocolFdMapping> maps;
     for (size_t i = 0; i < aInfoListSize; i++) {
         int _fd = aInfoList[i].newFds[NUWA_NEWFD_PARENT];
         mozilla::ipc::FileDescriptor fd(_fd);
         mozilla::ipc::ProtocolFdMapping map(aInfoList[i].protoId, fd);
         maps.AppendElement(map);
     }
     nsRefPtr<RunAddNewIPCProcess> runner = new RunAddNewIPCProcess(aPid, maps);
     NS_DispatchToMainThread(runner);
 }
 NS_EXPORT void
 OnNuwaProcessReady()
 {
     mozilla::dom::ContentChild* content =
         mozilla::dom::ContentChild::GetSingleton();
     content->SendNuwaReady();
 }
 NS_EXPORT void
 AfterNuwaFork()
 {
     SetCurrentProcessPrivileges(base::PRIVILEGES_DEFAULT);
 }
 #endif // MOZ_NUWA_PROCESS
 }

The Tor Browser / annotate

dom/ipc/ContentChild.cpp@b8a032363ba2 (annotated)

dom/ipc/ContentChild.cpp