Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 790 insertions, 0 deletions

diff --git a/xpcom/build/XPCOMInit.cpp b/xpcom/build/XPCOMInit.cpp
new file mode 100644
index 0000000000..cd6c7f7052
--- /dev/null
+++ b/xpcom/build/XPCOMInit.cpp
@@ -0,0 +1,790 @@
+/* -*- 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 "ThreadEventTarget.h"
+#include "XPCOMModule.h"
+
+#include "base/basictypes.h"
+
+#include "mozilla/AbstractThread.h"
+#include "mozilla/AppShutdown.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Poison.h"
+#include "mozilla/SharedThreadPool.h"
+#include "mozilla/TaskController.h"
+#include "mozilla/Unused.h"
+#include "mozilla/XPCOM.h"
+#include "mozJSModuleLoader.h"
+#include "nsXULAppAPI.h"
+
+#ifndef ANDROID
+#  include "nsTerminator.h"
+#endif
+
+#include "nsXPCOMPrivate.h"
+#include "nsXPCOMCIDInternal.h"
+
+#include "mozilla/dom/JSExecutionManager.h"
+#include "mozilla/layers/ImageBridgeChild.h"
+#include "mozilla/layers/CompositorBridgeParent.h"
+
+#include "prlink.h"
+
+#include "nsCycleCollector.h"
+#include "nsObserverService.h"
+
+#include "nsDebugImpl.h"
+#include "nsSystemInfo.h"
+
+#include "nsComponentManager.h"
+#include "nsCategoryManagerUtils.h"
+#include "nsIServiceManager.h"
+
+#include "nsThreadManager.h"
+#include "nsThreadPool.h"
+
+#include "nsTimerImpl.h"
+#include "TimerThread.h"
+
+#include "nsThread.h"
+#include "nsVersionComparatorImpl.h"
+
+#include "nsIFile.h"
+#include "nsLocalFile.h"
+#include "nsDirectoryService.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsCategoryManager.h"
+#include "nsMultiplexInputStream.h"
+
+#include "nsAtomTable.h"
+#include "nsISupportsImpl.h"
+
+#include "nsSystemInfo.h"
+#include "nsMemoryReporterManager.h"
+#include "nsMessageLoop.h"
+#include "nss.h"
+#include "nsNSSComponent.h"
+
+#include <locale.h>
+#include "mozilla/Services.h"
+#include "mozilla/Omnijar.h"
+#include "mozilla/ScriptPreloader.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/BackgroundHangMonitor.h"
+
+#include "mozilla/PoisonIOInterposer.h"
+#include "mozilla/LateWriteChecks.h"
+
+#include "mozilla/scache/StartupCache.h"
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/message_loop.h"
+
+#include "mozilla/ipc/BrowserProcessSubThread.h"
+#include "mozilla/AvailableMemoryTracker.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/CountingAllocatorBase.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/ServoStyleConsts.h"
+
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+
+#include "ogg/ogg.h"
+
+#include "GeckoProfiler.h"
+#include "ProfilerControl.h"
+
+#include "jsapi.h"
+#include "js/Initialization.h"
+#include "mozilla/StaticPrefs_javascript.h"
+#include "XPCSelfHostedShmem.h"
+
+#include "gfxPlatform.h"
+
+using base::AtExitManager;
+using mozilla::ipc::BrowserProcessSubThread;
+
+// From toolkit/library/rust/lib.rs
+extern "C" void GkRust_Init();
+extern "C" void GkRust_Shutdown();
+
+namespace {
+
+static AtExitManager* sExitManager;
+static MessageLoop* sMessageLoop;
+static bool sCommandLineWasInitialized;
+static BrowserProcessSubThread* sIOThread;
+static mozilla::BackgroundHangMonitor* sMainHangMonitor;
+
+} /* anonymous namespace */
+
+// Registry Factory creation function defined in nsRegistry.cpp
+// We hook into this function locally to create and register the registry
+// Since noone outside xpcom needs to know about this and nsRegistry.cpp
+// does not have a local include file, we are putting this definition
+// here rather than in nsIRegistry.h
+extern nsresult NS_RegistryGetFactory(nsIFactory** aFactory);
+extern nsresult NS_CategoryManagerGetFactory(nsIFactory**);
+
+#ifdef XP_WIN
+extern nsresult CreateAnonTempFileRemover();
+#endif
+
+nsresult nsThreadManagerGetSingleton(const nsIID& aIID, void** aInstancePtr) {
+  NS_ASSERTION(aInstancePtr, "null outptr");
+  return nsThreadManager::get().QueryInterface(aIID, aInstancePtr);
+}
+
+nsresult nsLocalFileConstructor(const nsIID& aIID, void** aInstancePtr) {
+  return nsLocalFile::nsLocalFileConstructor(aIID, aInstancePtr);
+}
+
+nsComponentManagerImpl* nsComponentManagerImpl::gComponentManager = nullptr;
+bool gXPCOMShuttingDown = false;
+bool gXPCOMMainThreadEventsAreDoomed = false;
+char16_t* gGREBinPath = nullptr;
+
+// gDebug will be freed during shutdown.
+static nsIDebug2* gDebug = nullptr;
+
+EXPORT_XPCOM_API(nsresult)
+NS_GetDebug(nsIDebug2** aResult) {
+  return nsDebugImpl::Create(NS_GET_IID(nsIDebug2), (void**)aResult);
+}
+
+class ICUReporter final : public nsIMemoryReporter,
+                          public mozilla::CountingAllocatorBase<ICUReporter> {
+ public:
+  NS_DECL_ISUPPORTS
+
+  static void* Alloc(const void*, size_t aSize) {
+    return CountingMalloc(aSize);
+  }
+
+  static void* Realloc(const void*, void* aPtr, size_t aSize) {
+    return CountingRealloc(aPtr, aSize);
+  }
+
+  static void Free(const void*, void* aPtr) { return CountingFree(aPtr); }
+
+ private:
+  NS_IMETHOD
+  CollectReports(nsIHandleReportCallback* aHandleReport, nsISupports* aData,
+                 bool aAnonymize) override {
+    MOZ_COLLECT_REPORT(
+        "explicit/icu", KIND_HEAP, UNITS_BYTES, MemoryAllocated(),
+        "Memory used by ICU, a Unicode and globalization support library.");
+
+    return NS_OK;
+  }
+
+  ~ICUReporter() = default;
+};
+
+NS_IMPL_ISUPPORTS(ICUReporter, nsIMemoryReporter)
+
+class OggReporter final : public nsIMemoryReporter,
+                          public mozilla::CountingAllocatorBase<OggReporter> {
+ public:
+  NS_DECL_ISUPPORTS
+
+ private:
+  NS_IMETHOD
+  CollectReports(nsIHandleReportCallback* aHandleReport, nsISupports* aData,
+                 bool aAnonymize) override {
+    MOZ_COLLECT_REPORT(
+        "explicit/media/libogg", KIND_HEAP, UNITS_BYTES, MemoryAllocated(),
+        "Memory allocated through libogg for Ogg, Theora, and related media "
+        "files.");
+
+    return NS_OK;
+  }
+
+  ~OggReporter() = default;
+};
+
+NS_IMPL_ISUPPORTS(OggReporter, nsIMemoryReporter)
+
+static bool sInitializedJS = false;
+
+static void InitializeJS() {
+#if defined(ENABLE_WASM_SIMD) && \
+    (defined(JS_CODEGEN_X64) || defined(JS_CODEGEN_X86))
+  // Update static engine preferences, such as AVX, before
+  // `JS_InitWithFailureDiagnostic` is called.
+  JS::SetAVXEnabled(mozilla::StaticPrefs::javascript_options_wasm_simd_avx());
+#endif
+
+  const char* jsInitFailureReason = JS_InitWithFailureDiagnostic();
+  if (jsInitFailureReason) {
+    MOZ_CRASH_UNSAFE(jsInitFailureReason);
+  }
+}
+
+// Note that on OSX, aBinDirectory will point to .app/Contents/Resources/browser
+EXPORT_XPCOM_API(nsresult)
+NS_InitXPCOM(nsIServiceManager** aResult, nsIFile* aBinDirectory,
+             nsIDirectoryServiceProvider* aAppFileLocationProvider,
+             bool aInitJSContext) {
+  static bool sInitialized = false;
+  if (sInitialized) {
+    return NS_ERROR_FAILURE;
+  }
+
+  sInitialized = true;
+
+  NS_LogInit();
+
+  NS_InitAtomTable();
+
+  // We don't have the arguments by hand here.  If logging has already been
+  // initialized by a previous call to LogModule::Init with the arguments
+  // passed, passing (0, nullptr) is alright here.
+  mozilla::LogModule::Init(0, nullptr);
+
+  GkRust_Init();
+
+  nsresult rv = NS_OK;
+
+  // We are not shutting down
+  gXPCOMShuttingDown = false;
+
+#ifdef XP_UNIX
+  // Discover the current value of the umask, and save it where
+  // nsSystemInfo::Init can retrieve it when necessary.  There is no way
+  // to read the umask without changing it, and the setting is process-
+  // global, so this must be done while we are still single-threaded; the
+  // nsSystemInfo object is typically created much later, when some piece
+  // of chrome JS wants it.  The system call is specified as unable to fail.
+  nsSystemInfo::gUserUmask = ::umask(0777);
+  ::umask(nsSystemInfo::gUserUmask);
+#endif
+
+  // Set up chromium libs
+  NS_ASSERTION(!sExitManager && !sMessageLoop, "Bad logic!");
+
+  if (!AtExitManager::AlreadyRegistered()) {
+    sExitManager = new AtExitManager();
+  }
+
+  MessageLoop* messageLoop = MessageLoop::current();
+  if (!messageLoop) {
+    sMessageLoop = new MessageLoopForUI(MessageLoop::TYPE_MOZILLA_PARENT);
+    sMessageLoop->set_thread_name("Gecko");
+    // Set experimental values for main thread hangs:
+    // 128ms for transient hangs and 8192ms for permanent hangs
+    sMessageLoop->set_hang_timeouts(128, 8192);
+  } else if (messageLoop->type() == MessageLoop::TYPE_MOZILLA_CHILD) {
+    messageLoop->set_thread_name("Gecko_Child");
+    messageLoop->set_hang_timeouts(128, 8192);
+  }
+
+  if (XRE_IsParentProcess() &&
+      !BrowserProcessSubThread::GetMessageLoop(BrowserProcessSubThread::IO)) {
+    mozilla::UniquePtr<BrowserProcessSubThread> ioThread =
+        mozilla::MakeUnique<BrowserProcessSubThread>(
+            BrowserProcessSubThread::IO);
+
+    base::Thread::Options options;
+    options.message_loop_type = MessageLoop::TYPE_IO;
+    if (NS_WARN_IF(!ioThread->StartWithOptions(options))) {
+      return NS_ERROR_FAILURE;
+    }
+
+    sIOThread = ioThread.release();
+  }
+
+  // Establish the main thread here.
+  rv = nsThreadManager::get().Init();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+  AUTO_PROFILER_INIT2;
+
+  // Set up the timer globals/timer thread
+  rv = nsTimerImpl::Startup();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+#ifndef ANDROID
+  // If the locale hasn't already been setup by our embedder,
+  // get us out of the "C" locale and into the system
+  if (strcmp(setlocale(LC_ALL, nullptr), "C") == 0) {
+    setlocale(LC_ALL, "");
+  }
+#endif
+
+  nsDirectoryService::RealInit();
+
+  bool value;
+
+  if (aBinDirectory) {
+    rv = aBinDirectory->IsDirectory(&value);
+
+    if (NS_SUCCEEDED(rv) && value) {
+      nsDirectoryService::gService->SetCurrentProcessDirectory(aBinDirectory);
+    }
+  }
+
+  if (aAppFileLocationProvider) {
+    rv = nsDirectoryService::gService->RegisterProvider(
+        aAppFileLocationProvider);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  nsCOMPtr<nsIFile> xpcomLib;
+  nsDirectoryService::gService->Get(NS_GRE_BIN_DIR, NS_GET_IID(nsIFile),
+                                    getter_AddRefs(xpcomLib));
+  MOZ_ASSERT(xpcomLib);
+
+  // set gGREBinPath
+  nsAutoString path;
+  xpcomLib->GetPath(path);
+  gGREBinPath = ToNewUnicode(path);
+
+  xpcomLib->AppendNative(nsDependentCString(XPCOM_DLL));
+  nsDirectoryService::gService->Set(NS_XPCOM_LIBRARY_FILE, xpcomLib);
+
+  if (!mozilla::Omnijar::IsInitialized()) {
+    mozilla::Omnijar::Init();
+  }
+
+  if ((sCommandLineWasInitialized = !CommandLine::IsInitialized())) {
+#ifdef OS_WIN
+    CommandLine::Init(0, nullptr);
+#else
+    nsCOMPtr<nsIFile> binaryFile;
+    nsDirectoryService::gService->Get(NS_XPCOM_CURRENT_PROCESS_DIR,
+                                      NS_GET_IID(nsIFile),
+                                      getter_AddRefs(binaryFile));
+    if (NS_WARN_IF(!binaryFile)) {
+      return NS_ERROR_FAILURE;
+    }
+
+    rv = binaryFile->AppendNative("nonexistent-executable"_ns);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    nsCString binaryPath;
+    rv = binaryFile->GetNativePath(binaryPath);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    static char const* const argv = {strdup(binaryPath.get())};
+    CommandLine::Init(1, &argv);
+#endif
+  }
+
+  NS_ASSERTION(nsComponentManagerImpl::gComponentManager == nullptr,
+               "CompMgr not null at init");
+
+  // Create the Component/Service Manager
+  nsComponentManagerImpl::gComponentManager = new nsComponentManagerImpl();
+  NS_ADDREF(nsComponentManagerImpl::gComponentManager);
+
+  // Global cycle collector initialization.
+  if (!nsCycleCollector_init()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // And start it up for this thread too.
+  nsCycleCollector_startup();
+
+  // Register ICU memory functions.  This really shouldn't be necessary: the
+  // JS engine should do this on its own inside JS_Init, and memory-reporting
+  // code should call a JSAPI function to observe ICU memory usage.  But we
+  // can't define the alloc/free functions in the JS engine, because it can't
+  // depend on the XPCOM-based memory reporting goop.  So for now, we have
+  // this oddness.
+  mozilla::SetICUMemoryFunctions();
+
+  // Do the same for libogg.
+  ogg_set_mem_functions(
+      OggReporter::CountingMalloc, OggReporter::CountingCalloc,
+      OggReporter::CountingRealloc, OggReporter::CountingFree);
+
+  // Initialize the JS engine.
+  InitializeJS();
+  sInitializedJS = true;
+
+  rv = nsComponentManagerImpl::gComponentManager->Init();
+  if (NS_FAILED(rv)) {
+    NS_RELEASE(nsComponentManagerImpl::gComponentManager);
+    return rv;
+  }
+
+  if (aResult) {
+    NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
+  }
+
+  // After autoreg, but before we actually instantiate any components,
+  // add any services listed in the "xpcom-directory-providers" category
+  // to the directory service.
+  nsDirectoryService::gService->RegisterCategoryProviders();
+
+  // Init mozilla::SharedThreadPool (which needs the service manager).
+  mozilla::SharedThreadPool::InitStatics();
+
+  mozilla::scache::StartupCache::GetSingleton();
+  mozilla::AvailableMemoryTracker::Init();
+
+  // Notify observers of xpcom autoregistration start
+  NS_CreateServicesFromCategory(NS_XPCOM_STARTUP_CATEGORY, nullptr,
+                                NS_XPCOM_STARTUP_OBSERVER_ID);
+#ifdef XP_WIN
+  CreateAnonTempFileRemover();
+#endif
+
+  // The memory reporter manager is up and running -- register our reporters.
+  RegisterStrongMemoryReporter(new ICUReporter());
+  RegisterStrongMemoryReporter(new OggReporter());
+  xpc::SelfHostedShmem::GetSingleton().InitMemoryReporter();
+
+  mozilla::Telemetry::Init();
+
+  mozilla::BackgroundHangMonitor::Startup();
+
+  const MessageLoop* const loop = MessageLoop::current();
+  sMainHangMonitor = new mozilla::BackgroundHangMonitor(
+      loop->thread_name().c_str(), loop->transient_hang_timeout(),
+      loop->permanent_hang_timeout());
+
+  mozilla::dom::JSExecutionManager::Initialize();
+
+  if (aInitJSContext) {
+    xpc::InitializeJSContext();
+  }
+
+  return NS_OK;
+}
+
+EXPORT_XPCOM_API(nsresult)
+NS_InitMinimalXPCOM() {
+  NS_SetMainThread();
+  mozilla::TimeStamp::Startup();
+  NS_LogInit();
+  NS_InitAtomTable();
+
+  // We don't have the arguments by hand here.  If logging has already been
+  // initialized by a previous call to LogModule::Init with the arguments
+  // passed, passing (0, nullptr) is alright here.
+  mozilla::LogModule::Init(0, nullptr);
+
+  GkRust_Init();
+
+  nsresult rv = nsThreadManager::get().Init();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // Set up the timer globals/timer thread.
+  rv = nsTimerImpl::Startup();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  // Create the Component/Service Manager
+  nsComponentManagerImpl::gComponentManager = new nsComponentManagerImpl();
+  NS_ADDREF(nsComponentManagerImpl::gComponentManager);
+
+  rv = nsComponentManagerImpl::gComponentManager->Init();
+  if (NS_FAILED(rv)) {
+    NS_RELEASE(nsComponentManagerImpl::gComponentManager);
+    return rv;
+  }
+
+  // Global cycle collector initialization.
+  if (!nsCycleCollector_init()) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  mozilla::SharedThreadPool::InitStatics();
+  mozilla::Telemetry::Init();
+  mozilla::BackgroundHangMonitor::Startup();
+
+  return NS_OK;
+}
+
+//
+// NS_ShutdownXPCOM()
+//
+// The shutdown sequence for xpcom would be
+//
+// - Notify "xpcom-shutdown" for modules to release primary (root) references
+// - Shutdown XPCOM timers
+// - Notify "xpcom-shutdown-threads" for thread joins
+// - Shutdown the event queues
+// - Release the Global Service Manager
+//   - Release all service instances held by the global service manager
+//   - Release the Global Service Manager itself
+// - Release the Component Manager
+//   - Release all factories cached by the Component Manager
+//   - Notify module loaders to shut down
+//   - Unload Libraries
+//   - Release Contractid Cache held by Component Manager
+//   - Release dll abstraction held by Component Manager
+//   - Release the Registry held by Component Manager
+//   - Finally, release the component manager itself
+//
+EXPORT_XPCOM_API(nsresult)
+NS_ShutdownXPCOM(nsIServiceManager* aServMgr) {
+  return mozilla::ShutdownXPCOM(aServMgr);
+}
+
+namespace mozilla {
+
+void SetICUMemoryFunctions() {
+  static bool sICUReporterInitialized = false;
+  if (!sICUReporterInitialized) {
+    if (!JS_SetICUMemoryFunctions(ICUReporter::Alloc, ICUReporter::Realloc,
+                                  ICUReporter::Free)) {
+      MOZ_CRASH("JS_SetICUMemoryFunctions failed.");
+    }
+    sICUReporterInitialized = true;
+  }
+}
+
+nsresult ShutdownXPCOM(nsIServiceManager* aServMgr) {
+  // Make sure the hang monitor is enabled for shutdown.
+  BackgroundHangMonitor().NotifyActivity();
+
+  if (!NS_IsMainThread()) {
+    MOZ_CRASH("Shutdown on wrong thread");
+  }
+
+  // Notify observers of xpcom shutting down
+  {
+    // Block it so that the COMPtr will get deleted before we hit
+    // servicemanager shutdown
+
+    nsCOMPtr<nsIThread> thread = do_GetCurrentThread();
+    if (NS_WARN_IF(!thread)) {
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    mozilla::AppShutdown::AdvanceShutdownPhase(
+        mozilla::ShutdownPhase::XPCOMWillShutdown);
+
+    // We want the service manager to be the subject of notifications
+    nsCOMPtr<nsIServiceManager> mgr;
+    Unused << NS_GetServiceManager(getter_AddRefs(mgr));
+    MOZ_DIAGNOSTIC_ASSERT(mgr != nullptr, "Service manager not present!");
+    mozilla::AppShutdown::AdvanceShutdownPhase(
+        mozilla::ShutdownPhase::XPCOMShutdown, nullptr, do_QueryInterface(mgr));
+
+    // This must happen after the shutdown of media and widgets, which
+    // are triggered by the NS_XPCOM_SHUTDOWN_OBSERVER_ID notification.
+    gfxPlatform::ShutdownLayersIPC();
+
+    mozilla::AppShutdown::AdvanceShutdownPhase(
+        mozilla::ShutdownPhase::XPCOMShutdownThreads);
+#ifdef DEBUG
+    // Prime an assertion at ThreadEventTarget::Dispatch to avoid late
+    // dispatches to non main-thread threads.
+    ThreadEventTarget::XPCOMShutdownThreadsNotificationFinished();
+#endif
+
+    // Shutdown the timer thread and all timers that might still be alive
+    nsTimerImpl::Shutdown();
+
+    // Have an extra round of processing after the timers went away.
+    NS_ProcessPendingEvents(thread);
+
+    // Shutdown all remaining threads.  This method does not return until
+    // all threads created using the thread manager (with the exception of
+    // the main thread) have exited.
+    nsThreadManager::get().ShutdownNonMainThreads();
+
+    RefPtr<nsObserverService> observerService;
+    CallGetService("@mozilla.org/observer-service;1",
+                   (nsObserverService**)getter_AddRefs(observerService));
+    if (observerService) {
+      observerService->Shutdown();
+    }
+
+    // XPCOMShutdownFinal is the default phase for ClearOnShutdown.
+    // This AdvanceShutdownPhase will thus free most ClearOnShutdown()'ed
+    // smart pointers. Some destructors may fire extra main thread runnables
+    // that will be processed inside AdvanceShutdownPhase.
+    AppShutdown::AdvanceShutdownPhase(ShutdownPhase::XPCOMShutdownFinal);
+
+    // Shutdown the main thread, processing our very last round of events, and
+    // then mark that we've finished main thread event processing.
+    nsThreadManager::get().ShutdownMainThread();
+    gXPCOMMainThreadEventsAreDoomed = true;
+
+    BackgroundHangMonitor().NotifyActivity();
+
+    mozilla::dom::JSExecutionManager::Shutdown();
+  }
+
+  // XPCOM is officially in shutdown mode NOW
+  // Set this only after the observers have been notified as this
+  // will cause servicemanager to become inaccessible.
+  mozilla::services::Shutdown();
+
+  // We may have AddRef'd for the caller of NS_InitXPCOM, so release it
+  // here again:
+  NS_IF_RELEASE(aServMgr);
+
+  // Shutdown global servicemanager
+  if (nsComponentManagerImpl::gComponentManager) {
+    nsComponentManagerImpl::gComponentManager->FreeServices();
+  }
+
+  // Remove the remaining main thread representations
+  nsThreadManager::get().ReleaseMainThread();
+  AbstractThread::ShutdownMainThread();
+
+  // Release the directory service
+  nsDirectoryService::gService = nullptr;
+
+  free(gGREBinPath);
+  gGREBinPath = nullptr;
+
+  // FIXME: This can cause harmless writes from sqlite committing
+  // log files. We have to ignore them before we can move
+  // the mozilla::PoisonWrite call before this point. See bug
+  // 834945 for the details.
+  mozJSModuleLoader::UnloadLoaders();
+
+  // Clear the profiler's JS context before cycle collection. The profiler will
+  // notify the JS engine that it can let go of any data it's holding on to for
+  // profiling purposes.
+  PROFILER_CLEAR_JS_CONTEXT();
+
+  bool shutdownCollect;
+#ifdef NS_FREE_PERMANENT_DATA
+  shutdownCollect = true;
+#else
+  shutdownCollect = !!PR_GetEnv("MOZ_CC_RUN_DURING_SHUTDOWN");
+#endif
+  nsCycleCollector_shutdown(shutdownCollect);
+
+  // There can be code trying to refer to global objects during the final cc
+  // shutdown. This is the phase for such global objects to correctly release.
+  AppShutdown::AdvanceShutdownPhase(ShutdownPhase::CCPostLastCycleCollection);
+
+  mozilla::scache::StartupCache::DeleteSingleton();
+  mozilla::ScriptPreloader::DeleteSingleton();
+
+  PROFILER_MARKER_UNTYPED("Shutdown xpcom", OTHER);
+
+  // Shutdown xpcom. This will release all loaders and cause others holding
+  // a refcount to the component manager to release it.
+  if (nsComponentManagerImpl::gComponentManager) {
+    DebugOnly<nsresult> rv =
+        (nsComponentManagerImpl::gComponentManager)->Shutdown();
+    NS_ASSERTION(NS_SUCCEEDED(rv.value), "Component Manager shutdown failed.");
+  } else {
+    NS_WARNING("Component Manager was never created ...");
+  }
+
+  if (sInitializedJS) {
+    // Shut down the JS engine.
+    JS_ShutDown();
+    sInitializedJS = false;
+  }
+
+  mozilla::ScriptPreloader::DeleteCacheDataSingleton();
+
+  // Release shared memory which might be borrowed by the JS engine.
+  xpc::SelfHostedShmem::Shutdown();
+
+  // After all threads have been joined and the component manager has been shut
+  // down, any remaining objects that could be holding NSS resources (should)
+  // have been released, so we can safely shut down NSS.
+  if (NSS_IsInitialized()) {
+    nsNSSComponent::DoClearSSLExternalAndInternalSessionCache();
+    if (NSS_Shutdown() != SECSuccess) {
+      // If you're seeing this crash and/or warning, some NSS resources are
+      // still in use (see bugs 1417680 and 1230312). Set the environment
+      // variable 'MOZ_IGNORE_NSS_SHUTDOWN_LEAKS' to some value to ignore this.
+      // Also, if leak checking is enabled, report this as a fake leak instead
+      // of crashing.
+#if defined(DEBUG) && !defined(ANDROID)
+      if (!getenv("MOZ_IGNORE_NSS_SHUTDOWN_LEAKS") &&
+          !getenv("XPCOM_MEM_BLOAT_LOG") && !getenv("XPCOM_MEM_LEAK_LOG") &&
+          !getenv("XPCOM_MEM_REFCNT_LOG") && !getenv("XPCOM_MEM_COMPTR_LOG")) {
+        MOZ_CRASH("NSS_Shutdown failed");
+      } else {
+#  ifdef NS_BUILD_REFCNT_LOGGING
+        // Create a fake leak.
+        NS_LogCtor((void*)0x100, "NSSShutdownFailed", 100);
+#  endif  // NS_BUILD_REFCNT_LOGGING
+        NS_WARNING("NSS_Shutdown failed");
+      }
+#else
+      NS_WARNING("NSS_Shutdown failed");
+#endif  // defined(DEBUG) && !defined(ANDROID)
+    }
+  }
+
+  // Finally, release the component manager last because it unloads the
+  // libraries:
+  if (nsComponentManagerImpl::gComponentManager) {
+    nsrefcnt cnt;
+    NS_RELEASE2(nsComponentManagerImpl::gComponentManager, cnt);
+    NS_ASSERTION(cnt == 0, "Component Manager being held past XPCOM shutdown.");
+  }
+  nsComponentManagerImpl::gComponentManager = nullptr;
+  nsCategoryManager::Destroy();
+
+  GkRust_Shutdown();
+
+#ifdef NS_FREE_PERMANENT_DATA
+  // By the time we're shutting down, there may still be async parse tasks going
+  // on in the Servo thread-pool. This is fairly uncommon, though not
+  // impossible. CSS parsing heavily uses the atom table, so obviously it's not
+  // fine to get rid of it.
+  //
+  // In leak-checking / ASAN / etc. builds, shut down the servo thread-pool,
+  // which will wait for all the work to be done. For other builds, we don't
+  // really want to wait on shutdown for possibly slow tasks. So just leak the
+  // atom table in those.
+  Servo_ShutdownThreadPool();
+  NS_ShutdownAtomTable();
+#endif
+
+  NS_IF_RELEASE(gDebug);
+
+  delete sIOThread;
+  sIOThread = nullptr;
+
+  delete sMessageLoop;
+  sMessageLoop = nullptr;
+
+  mozilla::TaskController::Shutdown();
+
+  if (sCommandLineWasInitialized) {
+    CommandLine::Terminate();
+    sCommandLineWasInitialized = false;
+  }
+
+  delete sExitManager;
+  sExitManager = nullptr;
+
+  Omnijar::CleanUp();
+
+  BackgroundHangMonitor::Shutdown();
+
+  delete sMainHangMonitor;
+  sMainHangMonitor = nullptr;
+
+  NS_LogTerm();
+
+  return NS_OK;
+}
+
+}  // namespace mozilla