Add m-esr52 at 52.6.0

43 files changed, 10686 insertions, 0 deletions

diff --git a/xpcom/build/BinaryPath.h b/xpcom/build/BinaryPath.h
new file mode 100644
index 0000000000..374763c79e
--- /dev/null
+++ b/xpcom/build/BinaryPath.h
@@ -0,0 +1,188 @@
+/* -*- 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/. */
+
+#ifndef mozilla_BinaryPath_h
+#define mozilla_BinaryPath_h
+
+#include "nsXPCOMPrivate.h" // for MAXPATHLEN
+#ifdef XP_WIN
+#include <windows.h>
+#elif defined(XP_MACOSX)
+#include <CoreFoundation/CoreFoundation.h>
+#elif defined(XP_UNIX)
+#include <sys/stat.h>
+#include <string.h>
+#endif
+
+namespace mozilla {
+
+class BinaryPath
+{
+public:
+#ifdef XP_WIN
+  static nsresult Get(const char* argv0, char aResult[MAXPATHLEN])
+  {
+    wchar_t wide_path[MAXPATHLEN];
+    nsresult rv = GetW(argv0, wide_path);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    WideCharToMultiByte(CP_UTF8, 0, wide_path, -1,
+                        aResult, MAXPATHLEN, nullptr, nullptr);
+    return NS_OK;
+  }
+
+private:
+  static nsresult GetW(const char* argv0, wchar_t aResult[MAXPATHLEN])
+  {
+    if (::GetModuleFileNameW(0, aResult, MAXPATHLEN)) {
+      return NS_OK;
+    }
+    return NS_ERROR_FAILURE;
+  }
+
+#elif defined(XP_MACOSX)
+  static nsresult Get(const char* argv0, char aResult[MAXPATHLEN])
+  {
+    // Works even if we're not bundled.
+    CFBundleRef appBundle = CFBundleGetMainBundle();
+    if (!appBundle) {
+      return NS_ERROR_FAILURE;
+    }
+
+    CFURLRef executableURL = CFBundleCopyExecutableURL(appBundle);
+    if (!executableURL) {
+      return NS_ERROR_FAILURE;
+    }
+
+    nsresult rv;
+    if (CFURLGetFileSystemRepresentation(executableURL, false, (UInt8*)aResult,
+                                         MAXPATHLEN)) {
+      // Sanitize path in case the app was launched from Terminal via
+      // './firefox' for example.
+      size_t readPos = 0;
+      size_t writePos = 0;
+      while (aResult[readPos] != '\0') {
+        if (aResult[readPos] == '.' && aResult[readPos + 1] == '/') {
+          readPos += 2;
+        } else {
+          aResult[writePos] = aResult[readPos];
+          readPos++;
+          writePos++;
+        }
+      }
+      aResult[writePos] = '\0';
+      rv = NS_OK;
+    } else {
+      rv = NS_ERROR_FAILURE;
+    }
+
+    CFRelease(executableURL);
+    return rv;
+  }
+
+#elif defined(ANDROID)
+  static nsresult Get(const char* argv0, char aResult[MAXPATHLEN])
+  {
+    // On Android, we use the GRE_HOME variable that is set by the Java
+    // bootstrap code.
+    const char* greHome = getenv("GRE_HOME");
+#if defined(MOZ_WIDGET_GONK)
+    if (!greHome) {
+      greHome = "/system/b2g";
+    }
+#endif
+
+    if (!greHome) {
+      return NS_ERROR_FAILURE;
+    }
+
+    snprintf(aResult, MAXPATHLEN, "%s/%s", greHome, "dummy");
+    aResult[MAXPATHLEN - 1] = '\0';
+    return NS_OK;
+  }
+
+#elif defined(XP_UNIX)
+  static nsresult Get(const char* aArgv0, char aResult[MAXPATHLEN])
+  {
+    struct stat fileStat;
+    // on unix, there is no official way to get the path of the current binary.
+    // instead of using the MOZILLA_FIVE_HOME hack, which doesn't scale to
+    // multiple applications, we will try a series of techniques:
+    //
+    // 1) use realpath() on argv[0], which works unless we're loaded from the
+    //    PATH. Only do so if argv[0] looks like a path (contains a /).
+    // 2) manually walk through the PATH and look for ourself
+    // 3) give up
+    if (strchr(aArgv0, '/') && realpath(aArgv0, aResult) &&
+        stat(aResult, &fileStat) == 0) {
+      return NS_OK;
+    }
+
+    const char* path = getenv("PATH");
+    if (!path) {
+      return NS_ERROR_FAILURE;
+    }
+
+    char* pathdup = strdup(path);
+    if (!pathdup) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    bool found = false;
+    char* token = strtok(pathdup, ":");
+    while (token) {
+      char tmpPath[MAXPATHLEN];
+      sprintf(tmpPath, "%s/%s", token, aArgv0);
+      if (realpath(tmpPath, aResult) && stat(aResult, &fileStat) == 0) {
+        found = true;
+        break;
+      }
+      token = strtok(nullptr, ":");
+    }
+    free(pathdup);
+    if (found) {
+      return NS_OK;
+    }
+    return NS_ERROR_FAILURE;
+  }
+
+#else
+#error Oops, you need platform-specific code here
+#endif
+
+public:
+  static nsresult GetFile(const char* aArgv0, nsIFile** aResult)
+  {
+    nsCOMPtr<nsIFile> lf;
+#ifdef XP_WIN
+    wchar_t exePath[MAXPATHLEN];
+    nsresult rv = GetW(aArgv0, exePath);
+#else
+    char exePath[MAXPATHLEN];
+    nsresult rv = Get(aArgv0, exePath);
+#endif
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+#ifdef XP_WIN
+    rv = NS_NewLocalFile(nsDependentString(exePath), true,
+                         getter_AddRefs(lf));
+#else
+    rv = NS_NewNativeLocalFile(nsDependentCString(exePath), true,
+                               getter_AddRefs(lf));
+#endif
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    NS_ADDREF(*aResult = lf);
+    return NS_OK;
+  }
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_BinaryPath_h */
diff --git a/xpcom/build/FileLocation.cpp b/xpcom/build/FileLocation.cpp
new file mode 100644
index 0000000000..03c1dc027d
--- /dev/null
+++ b/xpcom/build/FileLocation.cpp
@@ -0,0 +1,224 @@
+/* -*- 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 "FileLocation.h"
+#include "nsZipArchive.h"
+#include "nsURLHelper.h"
+
+namespace mozilla {
+
+FileLocation::FileLocation()
+{
+}
+
+FileLocation::~FileLocation()
+{
+}
+
+FileLocation::FileLocation(nsIFile* aFile)
+{
+  Init(aFile);
+}
+
+FileLocation::FileLocation(nsIFile* aFile, const char* aPath)
+{
+  Init(aFile, aPath);
+}
+
+FileLocation::FileLocation(const FileLocation& aFile, const char* aPath)
+{
+  if (aFile.IsZip()) {
+    if (aFile.mBaseFile) {
+      Init(aFile.mBaseFile, aFile.mPath.get());
+    }
+    else {
+      Init(aFile.mBaseZip, aFile.mPath.get());
+    }
+    if (aPath) {
+      int32_t i = mPath.RFindChar('/');
+      if (kNotFound == i) {
+        mPath.Truncate(0);
+      } else {
+        mPath.Truncate(i + 1);
+      }
+      mPath += aPath;
+    }
+  } else {
+    if (aPath) {
+      nsCOMPtr<nsIFile> cfile;
+      aFile.mBaseFile->GetParent(getter_AddRefs(cfile));
+
+#if defined(XP_WIN)
+      nsAutoCString pathStr(aPath);
+      char* p;
+      uint32_t len = pathStr.GetMutableData(&p);
+      for (; len; ++p, --len) {
+        if ('/' == *p) {
+          *p = '\\';
+        }
+      }
+      cfile->AppendRelativeNativePath(pathStr);
+#else
+      cfile->AppendRelativeNativePath(nsDependentCString(aPath));
+#endif
+      Init(cfile);
+    } else {
+      Init(aFile.mBaseFile);
+    }
+  }
+}
+
+void
+FileLocation::Init(nsIFile* aFile)
+{
+  mBaseZip = nullptr;
+  mBaseFile = aFile;
+  mPath.Truncate();
+}
+
+void
+FileLocation::Init(nsIFile* aFile, const char* aPath)
+{
+  mBaseZip = nullptr;
+  mBaseFile = aFile;
+  mPath = aPath;
+}
+
+void
+FileLocation::Init(nsZipArchive* aZip, const char* aPath)
+{
+  mBaseZip = aZip;
+  mBaseFile = nullptr;
+  mPath = aPath;
+}
+
+void
+FileLocation::GetURIString(nsACString& aResult) const
+{
+  if (mBaseFile) {
+    net_GetURLSpecFromActualFile(mBaseFile, aResult);
+  } else if (mBaseZip) {
+    RefPtr<nsZipHandle> handler = mBaseZip->GetFD();
+    handler->mFile.GetURIString(aResult);
+  }
+  if (IsZip()) {
+    aResult.Insert("jar:", 0);
+    aResult += "!/";
+    aResult += mPath;
+  }
+}
+
+already_AddRefed<nsIFile>
+FileLocation::GetBaseFile()
+{
+  if (IsZip() && mBaseZip) {
+    RefPtr<nsZipHandle> handler = mBaseZip->GetFD();
+    if (handler) {
+      return handler->mFile.GetBaseFile();
+    }
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIFile> file = mBaseFile;
+  return file.forget();
+}
+
+bool
+FileLocation::Equals(const FileLocation& aFile) const
+{
+  if (mPath != aFile.mPath) {
+    return false;
+  }
+
+  if (mBaseFile && aFile.mBaseFile) {
+    bool eq;
+    return NS_SUCCEEDED(mBaseFile->Equals(aFile.mBaseFile, &eq)) && eq;
+  }
+
+  const FileLocation* a = this;
+  const FileLocation* b = &aFile;
+  if (a->mBaseZip) {
+    RefPtr<nsZipHandle> handler = a->mBaseZip->GetFD();
+    a = &handler->mFile;
+  }
+  if (b->mBaseZip) {
+    RefPtr<nsZipHandle> handler = b->mBaseZip->GetFD();
+    b = &handler->mFile;
+  }
+
+  return a->Equals(*b);
+}
+
+nsresult
+FileLocation::GetData(Data& aData)
+{
+  if (!IsZip()) {
+    return mBaseFile->OpenNSPRFileDesc(PR_RDONLY, 0444, &aData.mFd.rwget());
+  }
+  aData.mZip = mBaseZip;
+  if (!aData.mZip) {
+    aData.mZip = new nsZipArchive();
+    aData.mZip->OpenArchive(mBaseFile);
+  }
+  aData.mItem = aData.mZip->GetItem(mPath.get());
+  if (aData.mItem) {
+    return NS_OK;
+  }
+  return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+}
+
+nsresult
+FileLocation::Data::GetSize(uint32_t* aResult)
+{
+  if (mFd) {
+    PRFileInfo64 fileInfo;
+    if (PR_SUCCESS != PR_GetOpenFileInfo64(mFd, &fileInfo)) {
+      return NS_ErrorAccordingToNSPR();
+    }
+
+    if (fileInfo.size > int64_t(UINT32_MAX)) {
+      return NS_ERROR_FILE_TOO_BIG;
+    }
+
+    *aResult = fileInfo.size;
+    return NS_OK;
+  }
+  else if (mItem) {
+    *aResult = mItem->RealSize();
+    return NS_OK;
+  }
+  return NS_ERROR_NOT_INITIALIZED;
+}
+
+nsresult
+FileLocation::Data::Copy(char* aBuf, uint32_t aLen)
+{
+  if (mFd) {
+    for (uint32_t totalRead = 0; totalRead < aLen;) {
+      int32_t read = PR_Read(mFd, aBuf + totalRead,
+                             XPCOM_MIN(aLen - totalRead, uint32_t(INT32_MAX)));
+      if (read < 0) {
+        return NS_ErrorAccordingToNSPR();
+      }
+      totalRead += read;
+    }
+    return NS_OK;
+  }
+  else if (mItem) {
+    nsZipCursor cursor(mItem, mZip, reinterpret_cast<uint8_t*>(aBuf),
+                       aLen, true);
+    uint32_t readLen;
+    cursor.Copy(&readLen);
+    if (readLen != aLen) {
+      nsZipArchive::sFileCorruptedReason = "FileLocation::Data: insufficient data";
+      return NS_ERROR_FILE_CORRUPTED;
+    }
+    return NS_OK;
+  }
+  return NS_ERROR_NOT_INITIALIZED;
+}
+
+} /* namespace mozilla */
diff --git a/xpcom/build/FileLocation.h b/xpcom/build/FileLocation.h
new file mode 100644
index 0000000000..e9a3fc5d06
--- /dev/null
+++ b/xpcom/build/FileLocation.h
@@ -0,0 +1,134 @@
+/* -*- 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/. */
+
+#ifndef mozilla_FileLocation_h
+#define mozilla_FileLocation_h
+
+#include "nsString.h"
+#include "nsCOMPtr.h"
+#include "nsAutoPtr.h"
+#include "nsIFile.h"
+#include "FileUtils.h"
+
+class nsZipArchive;
+class nsZipItem;
+
+namespace mozilla {
+
+class FileLocation
+{
+public:
+  /**
+   * FileLocation is an helper to handle different kind of file locations
+   * within Gecko:
+   * - on filesystems
+   * - in archives
+   * - in archives within archives
+   * As such, it stores a path within an archive, as well as the archive
+   * path itself, or the complete file path alone when on a filesystem.
+   * When the archive is in an archive, an nsZipArchive is stored instead
+   * of a file path.
+   */
+  FileLocation();
+  ~FileLocation();
+
+  /**
+   * Constructor for plain files
+   */
+  explicit FileLocation(nsIFile* aFile);
+
+  /**
+   * Constructors for path within an archive. The archive can be given either
+   * as nsIFile or nsZipArchive.
+   */
+  FileLocation(nsIFile* aZip, const char* aPath);
+
+  FileLocation(nsZipArchive* aZip, const char* aPath);
+
+  /**
+   * Creates a new file location relative to another one.
+   */
+  FileLocation(const FileLocation& aFile, const char* aPath = nullptr);
+
+  /**
+   * Initialization functions corresponding to constructors
+   */
+  void Init(nsIFile* aFile);
+
+  void Init(nsIFile* aZip, const char* aPath);
+
+  void Init(nsZipArchive* aZip, const char* aPath);
+
+  /**
+   * Returns an URI string corresponding to the file location
+   */
+  void GetURIString(nsACString& aResult) const;
+
+  /**
+   * Returns the base file of the location, where base file is defined as:
+   * - The file itself when the location is on a filesystem
+   * - The archive file when the location is in an archive
+   * - The outer archive file when the location is in an archive in an archive
+   */
+  already_AddRefed<nsIFile> GetBaseFile();
+
+  /**
+   * Returns whether the "base file" (see GetBaseFile) is an archive
+   */
+  bool IsZip() const { return !mPath.IsEmpty(); }
+
+  /**
+   * Returns the path within the archive, when within an archive
+   */
+  void GetPath(nsACString& aResult) const { aResult = mPath; }
+
+  /**
+   * Boolean value corresponding to whether the file location is initialized
+   * or not.
+   */
+  explicit operator bool() const { return mBaseFile || mBaseZip; }
+
+  /**
+   * Returns whether another FileLocation points to the same resource
+   */
+  bool Equals(const FileLocation& aFile) const;
+
+  /**
+   * Data associated with a FileLocation.
+   */
+  class Data
+  {
+  public:
+    /**
+     * Returns the data size
+     */
+    nsresult GetSize(uint32_t* aResult);
+
+    /**
+     * Copies the data in the given buffer
+     */
+    nsresult Copy(char* aBuf, uint32_t aLen);
+  protected:
+    friend class FileLocation;
+    nsZipItem* mItem;
+    RefPtr<nsZipArchive> mZip;
+    mozilla::AutoFDClose mFd;
+  };
+
+  /**
+   * Returns the data associated with the resource pointed at by the file
+   * location.
+   */
+  nsresult GetData(Data& aData);
+private:
+  nsCOMPtr<nsIFile> mBaseFile;
+  RefPtr<nsZipArchive> mBaseZip;
+  nsCString mPath;
+}; /* class FileLocation */
+
+} /* namespace mozilla */
+
+#endif /* mozilla_FileLocation_h */
diff --git a/xpcom/build/FrozenFunctions.cpp b/xpcom/build/FrozenFunctions.cpp
new file mode 100644
index 0000000000..8a957ca45f
--- /dev/null
+++ b/xpcom/build/FrozenFunctions.cpp
@@ -0,0 +1,138 @@
+/* -*- 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 "nsXPCOM.h"
+#include "nsXPCOMPrivate.h"
+#include "nsXPCOMStrings.h"
+#include "xptcall.h"
+
+#include <string.h>
+
+/**
+ * Private Method to register an exit routine.  This method
+ * used to allow you to setup a callback that will be called from
+ * the NS_ShutdownXPCOM function after all services and
+ * components have gone away. It was fatally flawed in that the component
+ * DLL could be released before the exit function was called; it is now a
+ * stub implementation that does nothing.
+ */
+XPCOM_API(nsresult)
+NS_RegisterXPCOMExitRoutine(XPCOMExitRoutine aExitRoutine, uint32_t aPriority);
+
+XPCOM_API(nsresult)
+NS_UnregisterXPCOMExitRoutine(XPCOMExitRoutine aExitRoutine);
+
+static const XPCOMFunctions kFrozenFunctions = {
+  XPCOM_GLUE_VERSION,
+  sizeof(XPCOMFunctions),
+  &NS_InitXPCOM2,
+  &NS_ShutdownXPCOM,
+  &NS_GetServiceManager,
+  &NS_GetComponentManager,
+  &NS_GetComponentRegistrar,
+  &NS_GetMemoryManager,
+  &NS_NewLocalFile,
+  &NS_NewNativeLocalFile,
+  &NS_RegisterXPCOMExitRoutine,
+  &NS_UnregisterXPCOMExitRoutine,
+
+  // these functions were added post 1.4
+  &NS_GetDebug,
+  nullptr,
+
+  // these functions were added post 1.6
+  &NS_StringContainerInit,
+  &NS_StringContainerFinish,
+  &NS_StringGetData,
+  &NS_StringSetData,
+  &NS_StringSetDataRange,
+  &NS_StringCopy,
+  &NS_CStringContainerInit,
+  &NS_CStringContainerFinish,
+  &NS_CStringGetData,
+  &NS_CStringSetData,
+  &NS_CStringSetDataRange,
+  &NS_CStringCopy,
+  &NS_CStringToUTF16,
+  &NS_UTF16ToCString,
+  &NS_StringCloneData,
+  &NS_CStringCloneData,
+
+  // these functions were added post 1.7 (post Firefox 1.0)
+  &moz_xmalloc,
+  &moz_xrealloc,
+  &free,
+  &NS_StringContainerInit2,
+  &NS_CStringContainerInit2,
+  &NS_StringGetMutableData,
+  &NS_CStringGetMutableData,
+  nullptr,
+
+  // these functions were added post 1.8
+  &NS_DebugBreak,
+  &NS_LogInit,
+  &NS_LogTerm,
+  &NS_LogAddRef,
+  &NS_LogRelease,
+  &NS_LogCtor,
+  &NS_LogDtor,
+  &NS_LogCOMPtrAddRef,
+  &NS_LogCOMPtrRelease,
+  &NS_GetXPTCallStub,
+  &NS_DestroyXPTCallStub,
+  &NS_InvokeByIndex,
+  nullptr,
+  nullptr,
+  &NS_StringSetIsVoid,
+  &NS_StringGetIsVoid,
+  &NS_CStringSetIsVoid,
+  &NS_CStringGetIsVoid,
+
+  // these functions were added post 1.9, but then made obsolete
+  nullptr,
+  nullptr,
+
+  &NS_CycleCollectorSuspect3,
+};
+
+EXPORT_XPCOM_API(nsresult)
+NS_GetFrozenFunctions(XPCOMFunctions* aFunctions, const char* /* aLibraryPath */)
+{
+  if (!aFunctions) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  if (aFunctions->version != XPCOM_GLUE_VERSION) {
+    return NS_ERROR_FAILURE;
+  }
+
+  uint32_t size = aFunctions->size;
+  if (size > sizeof(XPCOMFunctions)) {
+    size = sizeof(XPCOMFunctions);
+  }
+
+  size -= offsetof(XPCOMFunctions, init);
+
+  memcpy(&aFunctions->init, &kFrozenFunctions.init, size);
+
+  return NS_OK;
+}
+
+/*
+ * Stubs for nsXPCOMPrivate.h
+ */
+
+EXPORT_XPCOM_API(nsresult)
+NS_RegisterXPCOMExitRoutine(XPCOMExitRoutine aExitRoutine, uint32_t aPriority)
+{
+  return NS_OK;
+}
+
+EXPORT_XPCOM_API(nsresult)
+NS_UnregisterXPCOMExitRoutine(XPCOMExitRoutine aExitRoutine)
+{
+  return NS_OK;
+}
diff --git a/xpcom/build/IOInterposer.cpp b/xpcom/build/IOInterposer.cpp
new file mode 100644
index 0000000000..1c3ff54d51
--- /dev/null
+++ b/xpcom/build/IOInterposer.cpp
@@ -0,0 +1,582 @@
+/* -*- 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 <algorithm>
+#include <vector>
+
+#include "IOInterposer.h"
+
+#include "IOInterposerPrivate.h"
+#include "MainThreadIOLogger.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/ThreadLocal.h"
+#include "nscore.h" // for NS_FREE_PERMANENT_DATA
+#if !defined(XP_WIN)
+#include "NSPRInterposer.h"
+#endif // !defined(XP_WIN)
+#include "nsXULAppAPI.h"
+#include "PoisonIOInterposer.h"
+
+using namespace mozilla;
+
+namespace {
+
+/** Find if a vector contains a specific element */
+template<class T>
+bool
+VectorContains(const std::vector<T>& aVector, const T& aElement)
+{
+  return std::find(aVector.begin(), aVector.end(), aElement) != aVector.end();
+}
+
+/** Remove element from a vector */
+template<class T>
+void
+VectorRemove(std::vector<T>& aVector, const T& aElement)
+{
+  typename std::vector<T>::iterator newEnd =
+    std::remove(aVector.begin(), aVector.end(), aElement);
+  aVector.erase(newEnd, aVector.end());
+}
+
+/** Lists of Observers */
+struct ObserverLists
+{
+private:
+  ~ObserverLists() {}
+
+public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ObserverLists)
+
+  ObserverLists() {}
+
+  ObserverLists(ObserverLists const& aOther)
+    : mCreateObservers(aOther.mCreateObservers)
+    , mReadObservers(aOther.mReadObservers)
+    , mWriteObservers(aOther.mWriteObservers)
+    , mFSyncObservers(aOther.mFSyncObservers)
+    , mStatObservers(aOther.mStatObservers)
+    , mCloseObservers(aOther.mCloseObservers)
+    , mStageObservers(aOther.mStageObservers)
+  {
+  }
+  // Lists of observers for I/O events.
+  // These are implemented as vectors since they are allowed to survive gecko,
+  // without reporting leaks. This is necessary for the IOInterposer to be used
+  // for late-write checks.
+  std::vector<IOInterposeObserver*>  mCreateObservers;
+  std::vector<IOInterposeObserver*>  mReadObservers;
+  std::vector<IOInterposeObserver*>  mWriteObservers;
+  std::vector<IOInterposeObserver*>  mFSyncObservers;
+  std::vector<IOInterposeObserver*>  mStatObservers;
+  std::vector<IOInterposeObserver*>  mCloseObservers;
+  std::vector<IOInterposeObserver*>  mStageObservers;
+};
+
+class PerThreadData
+{
+public:
+  explicit PerThreadData(bool aIsMainThread = false)
+    : mIsMainThread(aIsMainThread)
+    , mIsHandlingObservation(false)
+    , mCurrentGeneration(0)
+  {
+    MOZ_COUNT_CTOR(PerThreadData);
+  }
+
+  ~PerThreadData()
+  {
+    MOZ_COUNT_DTOR(PerThreadData);
+  }
+
+  void CallObservers(IOInterposeObserver::Observation& aObservation)
+  {
+    // Prevent recursive reporting.
+    if (mIsHandlingObservation) {
+      return;
+    }
+
+    mIsHandlingObservation = true;
+    // Decide which list of observers to inform
+    std::vector<IOInterposeObserver*>* observers = nullptr;
+    switch (aObservation.ObservedOperation()) {
+      case IOInterposeObserver::OpCreateOrOpen:
+        observers = &mObserverLists->mCreateObservers;
+        break;
+      case IOInterposeObserver::OpRead:
+        observers = &mObserverLists->mReadObservers;
+        break;
+      case IOInterposeObserver::OpWrite:
+        observers = &mObserverLists->mWriteObservers;
+        break;
+      case IOInterposeObserver::OpFSync:
+        observers = &mObserverLists->mFSyncObservers;
+        break;
+      case IOInterposeObserver::OpStat:
+        observers = &mObserverLists->mStatObservers;
+        break;
+      case IOInterposeObserver::OpClose:
+        observers = &mObserverLists->mCloseObservers;
+        break;
+      case IOInterposeObserver::OpNextStage:
+        observers = &mObserverLists->mStageObservers;
+        break;
+      default: {
+        // Invalid IO operation, see documentation comment for
+        // IOInterposer::Report()
+        MOZ_ASSERT(false);
+        // Just ignore it in non-debug builds.
+        return;
+      }
+    }
+    MOZ_ASSERT(observers);
+
+    // Inform observers
+    for (auto i = observers->begin(), e = observers->end(); i != e; ++i) {
+      (*i)->Observe(aObservation);
+    }
+    mIsHandlingObservation = false;
+  }
+
+  inline uint32_t GetCurrentGeneration() const { return mCurrentGeneration; }
+
+  inline bool IsMainThread() const { return mIsMainThread; }
+
+  inline void SetObserverLists(uint32_t aNewGeneration,
+                               RefPtr<ObserverLists>& aNewLists)
+  {
+    mCurrentGeneration = aNewGeneration;
+    mObserverLists = aNewLists;
+  }
+
+  inline void ClearObserverLists()
+  {
+    if (mObserverLists) {
+      mCurrentGeneration = 0;
+      mObserverLists = nullptr;
+    }
+  }
+
+private:
+  bool                  mIsMainThread;
+  bool                  mIsHandlingObservation;
+  uint32_t              mCurrentGeneration;
+  RefPtr<ObserverLists> mObserverLists;
+};
+
+class MasterList
+{
+public:
+  MasterList()
+    : mObservedOperations(IOInterposeObserver::OpNone)
+    , mIsEnabled(true)
+  {
+    MOZ_COUNT_CTOR(MasterList);
+  }
+
+  ~MasterList()
+  {
+    MOZ_COUNT_DTOR(MasterList);
+  }
+
+  inline void Disable() { mIsEnabled = false; }
+  inline void Enable() { mIsEnabled = true; }
+
+  void Register(IOInterposeObserver::Operation aOp,
+                IOInterposeObserver* aObserver)
+  {
+    IOInterposer::AutoLock lock(mLock);
+
+    ObserverLists* newLists = nullptr;
+    if (mObserverLists) {
+      newLists = new ObserverLists(*mObserverLists);
+    } else {
+      newLists = new ObserverLists();
+    }
+    // You can register to observe multiple types of observations
+    // but you'll never be registered twice for the same observations.
+    if (aOp & IOInterposeObserver::OpCreateOrOpen &&
+        !VectorContains(newLists->mCreateObservers, aObserver)) {
+      newLists->mCreateObservers.push_back(aObserver);
+    }
+    if (aOp & IOInterposeObserver::OpRead &&
+        !VectorContains(newLists->mReadObservers, aObserver)) {
+      newLists->mReadObservers.push_back(aObserver);
+    }
+    if (aOp & IOInterposeObserver::OpWrite &&
+        !VectorContains(newLists->mWriteObservers, aObserver)) {
+      newLists->mWriteObservers.push_back(aObserver);
+    }
+    if (aOp & IOInterposeObserver::OpFSync &&
+        !VectorContains(newLists->mFSyncObservers, aObserver)) {
+      newLists->mFSyncObservers.push_back(aObserver);
+    }
+    if (aOp & IOInterposeObserver::OpStat &&
+        !VectorContains(newLists->mStatObservers, aObserver)) {
+      newLists->mStatObservers.push_back(aObserver);
+    }
+    if (aOp & IOInterposeObserver::OpClose &&
+        !VectorContains(newLists->mCloseObservers, aObserver)) {
+      newLists->mCloseObservers.push_back(aObserver);
+    }
+    if (aOp & IOInterposeObserver::OpNextStage &&
+        !VectorContains(newLists->mStageObservers, aObserver)) {
+      newLists->mStageObservers.push_back(aObserver);
+    }
+    mObserverLists = newLists;
+    mObservedOperations =
+      (IOInterposeObserver::Operation)(mObservedOperations | aOp);
+
+    mCurrentGeneration++;
+  }
+
+  void Unregister(IOInterposeObserver::Operation aOp,
+                  IOInterposeObserver* aObserver)
+  {
+    IOInterposer::AutoLock lock(mLock);
+
+    ObserverLists* newLists = nullptr;
+    if (mObserverLists) {
+      newLists = new ObserverLists(*mObserverLists);
+    } else {
+      newLists = new ObserverLists();
+    }
+
+    if (aOp & IOInterposeObserver::OpCreateOrOpen) {
+      VectorRemove(newLists->mCreateObservers, aObserver);
+      if (newLists->mCreateObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpCreateOrOpen);
+      }
+    }
+    if (aOp & IOInterposeObserver::OpRead) {
+      VectorRemove(newLists->mReadObservers, aObserver);
+      if (newLists->mReadObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpRead);
+      }
+    }
+    if (aOp & IOInterposeObserver::OpWrite) {
+      VectorRemove(newLists->mWriteObservers, aObserver);
+      if (newLists->mWriteObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpWrite);
+      }
+    }
+    if (aOp & IOInterposeObserver::OpFSync) {
+      VectorRemove(newLists->mFSyncObservers, aObserver);
+      if (newLists->mFSyncObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpFSync);
+      }
+    }
+    if (aOp & IOInterposeObserver::OpStat) {
+      VectorRemove(newLists->mStatObservers, aObserver);
+      if (newLists->mStatObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpStat);
+      }
+    }
+    if (aOp & IOInterposeObserver::OpClose) {
+      VectorRemove(newLists->mCloseObservers, aObserver);
+      if (newLists->mCloseObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpClose);
+      }
+    }
+    if (aOp & IOInterposeObserver::OpNextStage) {
+      VectorRemove(newLists->mStageObservers, aObserver);
+      if (newLists->mStageObservers.empty()) {
+        mObservedOperations =
+          (IOInterposeObserver::Operation)(mObservedOperations &
+                                           ~IOInterposeObserver::OpNextStage);
+      }
+    }
+    mObserverLists = newLists;
+    mCurrentGeneration++;
+  }
+
+  void Update(PerThreadData& aPtd)
+  {
+    if (mCurrentGeneration == aPtd.GetCurrentGeneration()) {
+      return;
+    }
+    // If the generation counts don't match then we need to update the current
+    // thread's observer list with the new master list.
+    IOInterposer::AutoLock lock(mLock);
+    aPtd.SetObserverLists(mCurrentGeneration, mObserverLists);
+  }
+
+  inline bool IsObservedOperation(IOInterposeObserver::Operation aOp)
+  {
+    // The quick reader may observe that no locks are being employed here,
+    // hence the result of the operations is truly undefined. However, most
+    // computers will usually return either true or false, which is good enough.
+    // It is not a problem if we occasionally report more or less IO than is
+    // actually occurring.
+    return mIsEnabled && !!(mObservedOperations & aOp);
+  }
+
+private:
+  RefPtr<ObserverLists>             mObserverLists;
+  // Note, we cannot use mozilla::Mutex here as the ObserverLists may be leaked
+  // (We want to monitor IO during shutdown). Furthermore, as we may have to
+  // unregister observers during shutdown an OffTheBooksMutex is not an option
+  // either, as its base calls into sDeadlockDetector which may be nullptr
+  // during shutdown.
+  IOInterposer::Mutex               mLock;
+  // Flags tracking which operations are being observed
+  IOInterposeObserver::Operation    mObservedOperations;
+  // Used for quickly disabling everything by IOInterposer::Disable()
+  Atomic<bool>                      mIsEnabled;
+  // Used to inform threads that the master observer list has changed
+  Atomic<uint32_t>                  mCurrentGeneration;
+};
+
+// Special observation used by IOInterposer::EnteringNextStage()
+class NextStageObservation : public IOInterposeObserver::Observation
+{
+public:
+  NextStageObservation()
+    : IOInterposeObserver::Observation(IOInterposeObserver::OpNextStage,
+                                       "IOInterposer", false)
+  {
+    mStart = TimeStamp::Now();
+    mEnd = mStart;
+  }
+};
+
+// List of observers registered
+static StaticAutoPtr<MasterList> sMasterList;
+static MOZ_THREAD_LOCAL(PerThreadData*) sThreadLocalData;
+static bool sThreadLocalDataInitialized;
+} // namespace
+
+IOInterposeObserver::Observation::Observation(Operation aOperation,
+                                              const char* aReference,
+                                              bool aShouldReport)
+  : mOperation(aOperation)
+  , mReference(aReference)
+  , mShouldReport(IOInterposer::IsObservedOperation(aOperation) &&
+                  aShouldReport)
+{
+  if (mShouldReport) {
+    mStart = TimeStamp::Now();
+  }
+}
+
+IOInterposeObserver::Observation::Observation(Operation aOperation,
+                                              const TimeStamp& aStart,
+                                              const TimeStamp& aEnd,
+                                              const char* aReference)
+  : mOperation(aOperation)
+  , mStart(aStart)
+  , mEnd(aEnd)
+  , mReference(aReference)
+  , mShouldReport(false)
+{
+}
+
+const char*
+IOInterposeObserver::Observation::ObservedOperationString() const
+{
+  switch (mOperation) {
+    case OpCreateOrOpen:
+      return "create/open";
+    case OpRead:
+      return "read";
+    case OpWrite:
+      return "write";
+    case OpFSync:
+      return "fsync";
+    case OpStat:
+      return "stat";
+    case OpClose:
+      return "close";
+    case OpNextStage:
+      return "NextStage";
+    default:
+      return "unknown";
+  }
+}
+
+void
+IOInterposeObserver::Observation::Report()
+{
+  if (mShouldReport) {
+    mEnd = TimeStamp::Now();
+    IOInterposer::Report(*this);
+  }
+}
+
+bool
+IOInterposer::Init()
+{
+  // Don't initialize twice...
+  if (sMasterList) {
+    return true;
+  }
+  if (!sThreadLocalData.init()) {
+    return false;
+  }
+  sThreadLocalDataInitialized = true;
+  bool isMainThread = true;
+  RegisterCurrentThread(isMainThread);
+  sMasterList = new MasterList();
+
+  MainThreadIOLogger::Init();
+
+  // Now we initialize the various interposers depending on platform
+  InitPoisonIOInterposer();
+  // We don't hook NSPR on Windows because PoisonIOInterposer captures a
+  // superset of the former's events.
+#if !defined(XP_WIN)
+  InitNSPRIOInterposing();
+#endif
+  return true;
+}
+
+bool
+IOInterposeObserver::IsMainThread()
+{
+  if (!sThreadLocalDataInitialized) {
+    return false;
+  }
+  PerThreadData* ptd = sThreadLocalData.get();
+  if (!ptd) {
+    return false;
+  }
+  return ptd->IsMainThread();
+}
+
+void
+IOInterposer::Clear()
+{
+  /* Clear() is a no-op on release builds so that we may continue to trap I/O
+     until process termination. In leak-checking builds, we need to shut down
+     IOInterposer so that all references are properly released. */
+#ifdef NS_FREE_PERMANENT_DATA
+  UnregisterCurrentThread();
+  sMasterList = nullptr;
+#endif
+}
+
+void
+IOInterposer::Disable()
+{
+  if (!sMasterList) {
+    return;
+  }
+  sMasterList->Disable();
+}
+
+void
+IOInterposer::Enable()
+{
+  if (!sMasterList) {
+    return;
+  }
+  sMasterList->Enable();
+}
+
+void
+IOInterposer::Report(IOInterposeObserver::Observation& aObservation)
+{
+  PerThreadData* ptd = sThreadLocalData.get();
+  if (!ptd) {
+    // In this case the current thread is not registered with IOInterposer.
+    // Alternatively we could take the slow path and just lock everything if
+    // we're not registered. That could potentially perform poorly, though.
+    return;
+  }
+
+  if (!sMasterList) {
+    // If there is no longer a master list then we should clear the local one.
+    ptd->ClearObserverLists();
+    return;
+  }
+
+  sMasterList->Update(*ptd);
+
+  // Don't try to report if there's nobody listening.
+  if (!IOInterposer::IsObservedOperation(aObservation.ObservedOperation())) {
+    return;
+  }
+
+  ptd->CallObservers(aObservation);
+}
+
+bool
+IOInterposer::IsObservedOperation(IOInterposeObserver::Operation aOp)
+{
+  return sMasterList && sMasterList->IsObservedOperation(aOp);
+}
+
+void
+IOInterposer::Register(IOInterposeObserver::Operation aOp,
+                       IOInterposeObserver* aObserver)
+{
+  MOZ_ASSERT(aObserver);
+  if (!sMasterList || !aObserver) {
+    return;
+  }
+
+  sMasterList->Register(aOp, aObserver);
+}
+
+void
+IOInterposer::Unregister(IOInterposeObserver::Operation aOp,
+                         IOInterposeObserver* aObserver)
+{
+  if (!sMasterList) {
+    return;
+  }
+
+  sMasterList->Unregister(aOp, aObserver);
+}
+
+void
+IOInterposer::RegisterCurrentThread(bool aIsMainThread)
+{
+  if (!sThreadLocalDataInitialized) {
+    return;
+  }
+  MOZ_ASSERT(!sThreadLocalData.get());
+  PerThreadData* curThreadData = new PerThreadData(aIsMainThread);
+  sThreadLocalData.set(curThreadData);
+}
+
+void
+IOInterposer::UnregisterCurrentThread()
+{
+  if (!sThreadLocalDataInitialized) {
+    return;
+  }
+  PerThreadData* curThreadData = sThreadLocalData.get();
+  MOZ_ASSERT(curThreadData);
+  sThreadLocalData.set(nullptr);
+  delete curThreadData;
+}
+
+void
+IOInterposer::EnteringNextStage()
+{
+  if (!sMasterList) {
+    return;
+  }
+  NextStageObservation observation;
+  Report(observation);
+}
+
diff --git a/xpcom/build/IOInterposer.h b/xpcom/build/IOInterposer.h
new file mode 100644
index 0000000000..3634572a5e
--- /dev/null
+++ b/xpcom/build/IOInterposer.h
@@ -0,0 +1,295 @@
+/* -*- 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/. */
+
+#ifndef mozilla_IOInterposer_h
+#define mozilla_IOInterposer_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/GuardObjects.h"
+#include "mozilla/TimeStamp.h"
+
+namespace mozilla {
+
+/**
+ * Interface for I/O interposer observers. This is separate from the
+ * IOInterposer because we have multiple uses for these observations.
+ */
+class IOInterposeObserver
+{
+public:
+  enum Operation
+  {
+    OpNone = 0,
+    OpCreateOrOpen = (1 << 0),
+    OpRead = (1 << 1),
+    OpWrite = (1 << 2),
+    OpFSync = (1 << 3),
+    OpStat = (1 << 4),
+    OpClose = (1 << 5),
+    OpNextStage = (1 << 6), // Meta - used when leaving startup, entering shutdown
+    OpWriteFSync = (OpWrite | OpFSync),
+    OpAll = (OpCreateOrOpen | OpRead | OpWrite | OpFSync | OpStat | OpClose),
+    OpAllWithStaging = (OpAll | OpNextStage)
+  };
+
+  /** A representation of an I/O observation  */
+  class Observation
+  {
+  protected:
+    /**
+     * This constructor is for use by subclasses that are intended to take
+     * timing measurements via RAII. The |aShouldReport| parameter may be
+     * used to make the measurement and reporting conditional on the
+     * satisfaction of an arbitrary predicate that was evaluated
+     * in the subclass. Note that IOInterposer::IsObservedOperation() is
+     * always ANDed with aShouldReport, so the subclass does not need to
+     * include a call to that function explicitly.
+     */
+    Observation(Operation aOperation, const char* aReference,
+                bool aShouldReport = true);
+
+  public:
+    /**
+     * Since this constructor accepts start and end times, it does *not* take
+     * its own timings, nor does it report itself.
+     */
+    Observation(Operation aOperation, const TimeStamp& aStart,
+                const TimeStamp& aEnd, const char* aReference);
+
+    /**
+     * Operation observed, this is one of the individual Operation values.
+     * Combinations of these flags are only used when registering observers.
+     */
+    Operation ObservedOperation() const { return mOperation; }
+
+    /**
+     * Return the observed operation as a human-readable string.
+     */
+    const char* ObservedOperationString() const;
+
+    /** Time at which the I/O operation was started */
+    TimeStamp Start() const { return mStart; }
+
+    /**
+     * Time at which the I/O operation ended, for asynchronous methods this is
+     * the time at which the call initiating the asynchronous request returned.
+     */
+    TimeStamp End() const { return mEnd; }
+
+    /**
+     * Duration of the operation, for asynchronous I/O methods this is the
+     * duration of the call initiating the asynchronous request.
+     */
+    TimeDuration Duration() const { return mEnd - mStart; }
+
+    /**
+     * IO reference, function name or name of component (sqlite) that did IO
+     * this is in addition the generic operation. This attribute may be platform
+     * specific, but should only take a finite number of distinct values.
+     * E.g. sqlite-commit, CreateFile, NtReadFile, fread, fsync, mmap, etc.
+     * I.e. typically the platform specific function that did the IO.
+     */
+    const char* Reference() const { return mReference; }
+
+    /** Request filename associated with the I/O operation, null if unknown */
+    virtual const char16_t* Filename() { return nullptr; }
+
+    virtual ~Observation() {}
+
+  protected:
+    void
+    Report();
+
+    Operation   mOperation;
+    TimeStamp   mStart;
+    TimeStamp   mEnd;
+    const char* mReference;     // Identifies the source of the Observation
+    bool        mShouldReport;  // Measure and report if true
+  };
+
+  /**
+   * Invoked whenever an implementation of the IOInterposeObserver should
+   * observe aObservation. Implement this and do your thing...
+   * But do consider if it is wise to use IO functions in this method, they are
+   * likely to cause recursion :)
+   * At least, see PoisonIOInterposer.h and register your handle as a debug file
+   * even, if you don't initialize the poison IO interposer, someone else might.
+   *
+   * Remark: Observations may occur on any thread.
+   */
+  virtual void Observe(Observation& aObservation) = 0;
+
+  virtual ~IOInterposeObserver() {}
+
+protected:
+  /**
+   * We don't use NS_IsMainThread() because we need to be able to determine the
+   * main thread outside of XPCOM Initialization. IOInterposer observers should
+   * call this function instead.
+   */
+  static bool IsMainThread();
+};
+
+/**
+ * These functions are responsible for ensuring that events are routed to the
+ * appropriate observers.
+ */
+namespace IOInterposer {
+
+/**
+ * This function must be called from the main-thread when no other threads are
+ * running before any of the other methods on this class may be used.
+ *
+ * IO reports can however, safely assume that IsObservedOperation() will
+ * return false until the IOInterposer is initialized.
+ *
+ * Remark, it's safe to call this method multiple times, so just call it when
+ * you to utilize IO interposing.
+ *
+ * Using the IOInterposerInit class is preferred to calling this directly.
+ */
+bool Init();
+
+/**
+ * This function must be called from the main thread, and furthermore
+ * it must be called when no other threads are executing. Effectively
+ * restricting us to calling it only during shutdown.
+ *
+ * Callers should take care that no other consumers are subscribed to events,
+ * as these events will stop when this function is called.
+ *
+ * In practice, we don't use this method as the IOInterposer is used for
+ * late-write checks.
+ */
+void Clear();
+
+/**
+ * This function immediately disables IOInterposer functionality in a fast,
+ * thread-safe manner. Primarily for use by the crash reporter.
+ */
+void Disable();
+
+/**
+ * This function re-enables IOInterposer functionality in a fast, thread-safe
+ * manner.  Primarily for use by the crash reporter.
+ */
+void Enable();
+
+/**
+ * Report IO to registered observers.
+ * Notice that the reported operation must be either OpRead, OpWrite or
+ * OpFSync. You are not allowed to report an observation with OpWriteFSync or
+ * OpAll, these are just auxiliary values for use with Register().
+ *
+ * If the IO call you're reporting does multiple things, write and fsync, you
+ * can choose to call Report() twice once with write and once with FSync. You
+ * may not call Report() with OpWriteFSync! The Observation::mOperation
+ * attribute is meant to be generic, not perfect.
+ *
+ * Notice that there is no reason to report an observation with an operation
+ * which is not being observed. Use IsObservedOperation() to check if the
+ * operation you are about to report is being observed. This is especially
+ * important if you are constructing expensive observations containing
+ * filename and full-path.
+ *
+ * Remark: Init() must be called before any IO is reported. But
+ * IsObservedOperation() will return false until Init() is called.
+ */
+void Report(IOInterposeObserver::Observation& aObservation);
+
+/**
+ * Return whether or not an operation is observed. Reporters should not
+ * report operations that are not being observed by anybody. This mechanism
+ * allows us to avoid reporting I/O when no observers are registered.
+ */
+bool IsObservedOperation(IOInterposeObserver::Operation aOp);
+
+/**
+ * Register IOInterposeObserver, the observer object will receive all
+ * observations for the given operation aOp.
+ *
+ * Remark: Init() must be called before observers are registered.
+ */
+void Register(IOInterposeObserver::Operation aOp,
+              IOInterposeObserver* aObserver);
+
+/**
+ * Unregister an IOInterposeObserver for a given operation
+ * Remark: It is always safe to unregister for all operations, even if yoú
+ * didn't register for them all.
+ * I.e. IOInterposer::Unregister(IOInterposeObserver::OpAll, aObserver)
+ *
+ * Remark: Init() must be called before observers are unregistered.
+ */
+void Unregister(IOInterposeObserver::Operation aOp,
+                IOInterposeObserver* aObserver);
+
+/**
+ * Registers the current thread with the IOInterposer. This must be done to
+ * ensure that per-thread data is created in an orderly fashion.
+ * We could have written this to initialize that data lazily, however this
+ * could have unintended consequences if a thread that is not aware of
+ * IOInterposer was implicitly registered: its per-thread data would never
+ * be deleted because it would not know to unregister itself.
+ *
+ * @param aIsMainThread true if IOInterposer should treat the current thread
+ *                      as the main thread.
+ */
+void RegisterCurrentThread(bool aIsMainThread = false);
+
+/**
+ * Unregisters the current thread with the IOInterposer. This is important
+ * to call when a thread is shutting down because it cleans up data that
+ * is stored in a TLS slot.
+ */
+void UnregisterCurrentThread();
+
+/**
+ * Called to inform observers that the process has transitioned out of the
+ * startup stage or into the shutdown stage. Main thread only.
+ */
+void EnteringNextStage();
+
+} // namespace IOInterposer
+
+class IOInterposerInit
+{
+public:
+  IOInterposerInit()
+  {
+#if !defined(RELEASE_OR_BETA)
+    IOInterposer::Init();
+#endif
+  }
+
+  ~IOInterposerInit()
+  {
+#if !defined(RELEASE_OR_BETA)
+    IOInterposer::Clear();
+#endif
+  }
+};
+
+class MOZ_RAII AutoIOInterposerDisable final
+{
+public:
+  explicit AutoIOInterposerDisable(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM)
+  {
+    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+    IOInterposer::Disable();
+  }
+  ~AutoIOInterposerDisable()
+  {
+    IOInterposer::Enable();
+  }
+
+private:
+  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+} // namespace mozilla
+
+#endif // mozilla_IOInterposer_h
diff --git a/xpcom/build/IOInterposerPrivate.h b/xpcom/build/IOInterposerPrivate.h
new file mode 100644
index 0000000000..5493210626
--- /dev/null
+++ b/xpcom/build/IOInterposerPrivate.h
@@ -0,0 +1,167 @@
+/* -*- 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/. */
+
+#ifndef xpcom_build_IOInterposerPrivate_h
+#define xpcom_build_IOInterposerPrivate_h
+
+/* This header file contains declarations for helper classes that are
+   to be used exclusively by IOInterposer and its observers. This header
+   file is not to be used by anything else and MUST NOT be exported! */
+
+#include <prcvar.h>
+#include <prlock.h>
+
+namespace mozilla {
+namespace IOInterposer {
+
+/**
+ * The following classes are simple wrappers for PRLock and PRCondVar.
+ * IOInterposer and friends use these instead of Mozilla::Mutex et al because
+ * of the fact that IOInterposer is permitted to run until the process
+ * terminates; we can't use anything that plugs into leak checkers or deadlock
+ * detectors because IOInterposer will outlive those and generate false
+ * positives.
+ */
+
+class Monitor
+{
+public:
+  Monitor()
+    : mLock(PR_NewLock())
+    , mCondVar(PR_NewCondVar(mLock))
+  {
+  }
+
+  ~Monitor()
+  {
+    PR_DestroyCondVar(mCondVar);
+    mCondVar = nullptr;
+    PR_DestroyLock(mLock);
+    mLock = nullptr;
+  }
+
+  void Lock()
+  {
+    PR_Lock(mLock);
+  }
+
+  void Unlock()
+  {
+    PR_Unlock(mLock);
+  }
+
+  bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
+  {
+    return PR_WaitCondVar(mCondVar, aTimeout) == PR_SUCCESS;
+  }
+
+  bool Notify()
+  {
+    return PR_NotifyCondVar(mCondVar) == PR_SUCCESS;
+  }
+
+private:
+  PRLock*    mLock;
+  PRCondVar* mCondVar;
+};
+
+class MonitorAutoLock
+{
+public:
+  explicit MonitorAutoLock(Monitor& aMonitor)
+    : mMonitor(aMonitor)
+  {
+    mMonitor.Lock();
+  }
+
+  ~MonitorAutoLock()
+  {
+    mMonitor.Unlock();
+  }
+
+  bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
+  {
+    return mMonitor.Wait(aTimeout);
+  }
+
+  bool Notify()
+  {
+    return mMonitor.Notify();
+  }
+
+private:
+  Monitor&  mMonitor;
+};
+
+class MonitorAutoUnlock
+{
+public:
+  explicit MonitorAutoUnlock(Monitor& aMonitor)
+    : mMonitor(aMonitor)
+  {
+    mMonitor.Unlock();
+  }
+
+  ~MonitorAutoUnlock()
+  {
+    mMonitor.Lock();
+  }
+
+private:
+  Monitor&  mMonitor;
+};
+
+class Mutex
+{
+public:
+  Mutex()
+    : mPRLock(PR_NewLock())
+  {
+  }
+
+  ~Mutex()
+  {
+    PR_DestroyLock(mPRLock);
+    mPRLock = nullptr;
+  }
+
+  void Lock()
+  {
+    PR_Lock(mPRLock);
+  }
+
+  void Unlock()
+  {
+    PR_Unlock(mPRLock);
+  }
+
+private:
+  PRLock*   mPRLock;
+};
+
+class AutoLock
+{
+public:
+  explicit AutoLock(Mutex& aLock)
+    : mLock(aLock)
+  {
+    mLock.Lock();
+  }
+
+  ~AutoLock()
+  {
+    mLock.Unlock();
+  }
+
+private:
+  Mutex&     mLock;
+};
+
+} // namespace IOInterposer
+} // namespace mozilla
+
+#endif // xpcom_build_IOInterposerPrivate_h
+
diff --git a/xpcom/build/LateWriteChecks.cpp b/xpcom/build/LateWriteChecks.cpp
new file mode 100644
index 0000000000..69dbedc0f3
--- /dev/null
+++ b/xpcom/build/LateWriteChecks.cpp
@@ -0,0 +1,258 @@
+/* -*- 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 <algorithm>
+
+#include "mozilla/IOInterposer.h"
+#include "mozilla/PoisonIOInterposer.h"
+#include "mozilla/ProcessedStack.h"
+#include "mozilla/SHA1.h"
+#include "mozilla/Scoped.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/Telemetry.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsPrintfCString.h"
+#include "mozilla/StackWalk.h"
+#include "plstr.h"
+#include "prio.h"
+
+#ifdef XP_WIN
+#define NS_T(str) L ## str
+#define NS_SLASH "\\"
+#include <fcntl.h>
+#include <io.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <windows.h>
+#else
+#define NS_SLASH "/"
+#endif
+
+#include "LateWriteChecks.h"
+
+#define OBSERVE_LATE_WRITES
+
+using namespace mozilla;
+
+/*************************** Auxiliary Declarations ***************************/
+
+// This a wrapper over a file descriptor that provides a Printf method and
+// computes the sha1 of the data that passes through it.
+class SHA1Stream
+{
+public:
+  explicit SHA1Stream(FILE* aStream)
+    : mFile(aStream)
+  {
+    MozillaRegisterDebugFILE(mFile);
+  }
+
+  void Printf(const char* aFormat, ...)
+  {
+    MOZ_ASSERT(mFile);
+    va_list list;
+    va_start(list, aFormat);
+    nsAutoCString str;
+    str.AppendPrintf(aFormat, list);
+    va_end(list);
+    mSHA1.update(str.get(), str.Length());
+    fwrite(str.get(), 1, str.Length(), mFile);
+  }
+  void Finish(SHA1Sum::Hash& aHash)
+  {
+    int fd = fileno(mFile);
+    fflush(mFile);
+    MozillaUnRegisterDebugFD(fd);
+    fclose(mFile);
+    mSHA1.finish(aHash);
+    mFile = nullptr;
+  }
+private:
+  FILE* mFile;
+  SHA1Sum mSHA1;
+};
+
+static void
+RecordStackWalker(uint32_t aFrameNumber, void* aPC, void* aSP, void* aClosure)
+{
+  std::vector<uintptr_t>* stack =
+    static_cast<std::vector<uintptr_t>*>(aClosure);
+  stack->push_back(reinterpret_cast<uintptr_t>(aPC));
+}
+
+/**************************** Late-Write Observer  ****************************/
+
+/**
+ * An implementation of IOInterposeObserver to be registered with IOInterposer.
+ * This observer logs all writes as late writes.
+ */
+class LateWriteObserver final : public IOInterposeObserver
+{
+public:
+  explicit LateWriteObserver(const char* aProfileDirectory)
+    : mProfileDirectory(PL_strdup(aProfileDirectory))
+  {
+  }
+  ~LateWriteObserver()
+  {
+    PL_strfree(mProfileDirectory);
+    mProfileDirectory = nullptr;
+  }
+
+  void Observe(IOInterposeObserver::Observation& aObservation);
+private:
+  char* mProfileDirectory;
+};
+
+void
+LateWriteObserver::Observe(IOInterposeObserver::Observation& aOb)
+{
+#ifdef OBSERVE_LATE_WRITES
+  // Crash if that is the shutdown check mode
+  if (gShutdownChecks == SCM_CRASH) {
+    MOZ_CRASH();
+  }
+
+  // If we have shutdown mode SCM_NOTHING or we can't record then abort
+  if (gShutdownChecks == SCM_NOTHING || !Telemetry::CanRecordExtended()) {
+    return;
+  }
+
+  // Write the stack and loaded libraries to a file. We can get here
+  // concurrently from many writes, so we use multiple temporary files.
+  std::vector<uintptr_t> rawStack;
+
+  MozStackWalk(RecordStackWalker, /* skipFrames */ 0, /* maxFrames */ 0,
+               reinterpret_cast<void*>(&rawStack), 0, nullptr);
+  Telemetry::ProcessedStack stack = Telemetry::GetStackAndModules(rawStack);
+
+  nsPrintfCString nameAux("%s%s%s", mProfileDirectory,
+                          NS_SLASH, "Telemetry.LateWriteTmpXXXXXX");
+  char* name;
+  nameAux.GetMutableData(&name);
+
+  // We want the sha1 of the entire file, so please don't write to fd
+  // directly; use sha1Stream.
+  FILE* stream;
+#ifdef XP_WIN
+  HANDLE hFile;
+  do {
+    // mkstemp isn't supported so keep trying until we get a file
+    int result = _mktemp_s(name, strlen(name) + 1);
+    hFile = CreateFileA(name, GENERIC_WRITE, 0, nullptr, CREATE_NEW,
+                        FILE_ATTRIBUTE_NORMAL, nullptr);
+  } while (GetLastError() == ERROR_FILE_EXISTS);
+
+  if (hFile == INVALID_HANDLE_VALUE) {
+    NS_RUNTIMEABORT("Um, how did we get here?");
+  }
+
+  // http://support.microsoft.com/kb/139640
+  int fd = _open_osfhandle((intptr_t)hFile, _O_APPEND);
+  if (fd == -1) {
+    NS_RUNTIMEABORT("Um, how did we get here?");
+  }
+
+  stream = _fdopen(fd, "w");
+#else
+  int fd = mkstemp(name);
+  stream = fdopen(fd, "w");
+#endif
+
+  SHA1Stream sha1Stream(stream);
+
+  size_t numModules = stack.GetNumModules();
+  sha1Stream.Printf("%u\n", (unsigned)numModules);
+  for (size_t i = 0; i < numModules; ++i) {
+    Telemetry::ProcessedStack::Module module = stack.GetModule(i);
+    sha1Stream.Printf("%s %s\n", module.mBreakpadId.c_str(),
+                      module.mName.c_str());
+  }
+
+  size_t numFrames = stack.GetStackSize();
+  sha1Stream.Printf("%u\n", (unsigned)numFrames);
+  for (size_t i = 0; i < numFrames; ++i) {
+    const Telemetry::ProcessedStack::Frame& frame = stack.GetFrame(i);
+    // NOTE: We write the offsets, while the atos tool expects a value with
+    // the virtual address added. For example, running otool -l on the the firefox
+    // binary shows
+    //      cmd LC_SEGMENT_64
+    //      cmdsize 632
+    //      segname __TEXT
+    //      vmaddr 0x0000000100000000
+    // so to print the line matching the offset 123 one has to run
+    // atos -o firefox 0x100000123.
+    sha1Stream.Printf("%d %x\n", frame.mModIndex, (unsigned)frame.mOffset);
+  }
+
+  SHA1Sum::Hash sha1;
+  sha1Stream.Finish(sha1);
+
+  // Note: These files should be deleted by telemetry once it reads them. If
+  // there were no telemetry runs by the time we shut down, we just add files
+  // to the existing ones instead of replacing them. Given that each of these
+  // files is a bug to be fixed, that is probably the right thing to do.
+
+  // We append the sha1 of the contents to the file name. This provides a simple
+  // client side deduplication.
+  nsPrintfCString finalName("%s%s", mProfileDirectory,
+                            "/Telemetry.LateWriteFinal-");
+  for (int i = 0; i < 20; ++i) {
+    finalName.AppendPrintf("%02x", sha1[i]);
+  }
+  PR_Delete(finalName.get());
+  PR_Rename(name, finalName.get());
+#endif
+}
+
+/******************************* Setup/Teardown *******************************/
+
+static StaticAutoPtr<LateWriteObserver> sLateWriteObserver;
+
+namespace mozilla {
+
+void
+InitLateWriteChecks()
+{
+  nsCOMPtr<nsIFile> mozFile;
+  NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR, getter_AddRefs(mozFile));
+  if (mozFile) {
+    nsAutoCString nativePath;
+    nsresult rv = mozFile->GetNativePath(nativePath);
+    if (NS_SUCCEEDED(rv) && nativePath.get()) {
+      sLateWriteObserver = new LateWriteObserver(nativePath.get());
+    }
+  }
+}
+
+void
+BeginLateWriteChecks()
+{
+  if (sLateWriteObserver) {
+    IOInterposer::Register(
+      IOInterposeObserver::OpWriteFSync,
+      sLateWriteObserver
+    );
+  }
+}
+
+void
+StopLateWriteChecks()
+{
+  if (sLateWriteObserver) {
+    IOInterposer::Unregister(
+      IOInterposeObserver::OpAll,
+      sLateWriteObserver
+    );
+    // Deallocation would not be thread-safe, and StopLateWriteChecks() is
+    // called at shutdown and only in special cases.
+    // sLateWriteObserver = nullptr;
+  }
+}
+
+} // namespace mozilla
diff --git a/xpcom/build/LateWriteChecks.h b/xpcom/build/LateWriteChecks.h
new file mode 100644
index 0000000000..96d981cc1b
--- /dev/null
+++ b/xpcom/build/LateWriteChecks.h
@@ -0,0 +1,60 @@
+/* -*- 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/. */
+
+#ifndef mozilla_LateWriteChecks_h
+#define mozilla_LateWriteChecks_h
+
+// This file, along with LateWriteChecks.cpp, serves to check for and report
+// late writes. The idea is discover writes to the file system that happens
+// during shutdown such that these maybe be moved forward and the process may be
+// killed without waiting for static destructors.
+
+namespace mozilla {
+
+/** Different shutdown check modes */
+enum ShutdownChecksMode
+{
+  SCM_CRASH,      /** Crash on shutdown check failure */
+  SCM_RECORD,     /** Record shutdown check violations */
+  SCM_NOTHING     /** Don't attempt any shutdown checks */
+};
+
+/**
+ * Current shutdown check mode.
+ * This variable is defined and initialized in nsAppRunner.cpp
+ */
+extern ShutdownChecksMode gShutdownChecks;
+
+/**
+ * Allocate structures and acquire information from XPCOM necessary to do late
+ * write checks. This function must be invoked before BeginLateWriteChecks()
+ * and before XPCOM has stopped working.
+ */
+void InitLateWriteChecks();
+
+/**
+ * Begin recording all writes as late-writes. This function should be called
+ * when all legitimate writes have occurred. This function does not rely on
+ * XPCOM as it is designed to be invoked during XPCOM shutdown.
+ *
+ * For late-write checks to work you must initialize one or more backends that
+ * reports IO through the IOInterposer API. PoisonIOInterposer would probably
+ * be the backend of choice in this case.
+ *
+ * Note: BeginLateWriteChecks() must have been invoked before this function.
+ */
+void BeginLateWriteChecks();
+
+/**
+ * Stop recording all writes as late-writes, call this function when you want
+ * late-write checks to stop. I.e. exception handling, or the special case on
+ * Mac described in bug 826029.
+ */
+void StopLateWriteChecks();
+
+} // namespace mozilla
+
+#endif // mozilla_LateWriteChecks_h
diff --git a/xpcom/build/MainThreadIOLogger.cpp b/xpcom/build/MainThreadIOLogger.cpp
new file mode 100644
index 0000000000..0ca942cb9f
--- /dev/null
+++ b/xpcom/build/MainThreadIOLogger.cpp
@@ -0,0 +1,225 @@
+/* -*- 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 "MainThreadIOLogger.h"
+
+#include "GeckoProfiler.h"
+#include "IOInterposerPrivate.h"
+#include "mozilla/IOInterposer.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "nsAutoPtr.h"
+#include "nsNativeCharsetUtils.h"
+
+/**
+ * This code uses NSPR stuff and STL containers because it must be detached
+ * from leak checking code; this observer runs until the process terminates.
+ */
+
+#include <prenv.h>
+#include <prprf.h>
+#include <prthread.h>
+#include <vector>
+
+namespace {
+
+struct ObservationWithStack
+{
+  ObservationWithStack(mozilla::IOInterposeObserver::Observation& aObs,
+                       ProfilerBacktrace* aStack)
+    : mObservation(aObs)
+    , mStack(aStack)
+  {
+    const char16_t* filename = aObs.Filename();
+    if (filename) {
+      mFilename = filename;
+    }
+  }
+
+  mozilla::IOInterposeObserver::Observation mObservation;
+  ProfilerBacktrace*                        mStack;
+  nsString                                  mFilename;
+};
+
+class MainThreadIOLoggerImpl final : public mozilla::IOInterposeObserver
+{
+public:
+  MainThreadIOLoggerImpl();
+  ~MainThreadIOLoggerImpl();
+
+  bool Init();
+
+  void Observe(Observation& aObservation);
+
+private:
+  static void sIOThreadFunc(void* aArg);
+  void IOThreadFunc();
+
+  TimeStamp             mLogStartTime;
+  const char*           mFileName;
+  PRThread*             mIOThread;
+  IOInterposer::Monitor mMonitor;
+  bool                  mShutdownRequired;
+  std::vector<ObservationWithStack> mObservations;
+};
+
+static StaticAutoPtr<MainThreadIOLoggerImpl> sImpl;
+
+MainThreadIOLoggerImpl::MainThreadIOLoggerImpl()
+  : mFileName(nullptr)
+  , mIOThread(nullptr)
+  , mShutdownRequired(false)
+{
+}
+
+MainThreadIOLoggerImpl::~MainThreadIOLoggerImpl()
+{
+  if (!mIOThread) {
+    return;
+  }
+  {
+    // Scope for lock
+    IOInterposer::MonitorAutoLock lock(mMonitor);
+    mShutdownRequired = true;
+    lock.Notify();
+  }
+  PR_JoinThread(mIOThread);
+  mIOThread = nullptr;
+}
+
+bool
+MainThreadIOLoggerImpl::Init()
+{
+  if (mFileName) {
+    // Already initialized
+    return true;
+  }
+  mFileName = PR_GetEnv("MOZ_MAIN_THREAD_IO_LOG");
+  if (!mFileName) {
+    // Can't start
+    return false;
+  }
+  mIOThread = PR_CreateThread(PR_USER_THREAD, &sIOThreadFunc, this,
+                              PR_PRIORITY_LOW, PR_GLOBAL_THREAD,
+                              PR_JOINABLE_THREAD, 0);
+  if (!mIOThread) {
+    return false;
+  }
+  return true;
+}
+
+/* static */ void
+MainThreadIOLoggerImpl::sIOThreadFunc(void* aArg)
+{
+  PR_SetCurrentThreadName("MainThreadIOLogger");
+  MainThreadIOLoggerImpl* obj = static_cast<MainThreadIOLoggerImpl*>(aArg);
+  obj->IOThreadFunc();
+}
+
+void
+MainThreadIOLoggerImpl::IOThreadFunc()
+{
+  PRFileDesc* fd = PR_Open(mFileName, PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE,
+                           PR_IRUSR | PR_IWUSR | PR_IRGRP);
+  if (!fd) {
+    IOInterposer::MonitorAutoLock lock(mMonitor);
+    mShutdownRequired = true;
+    std::vector<ObservationWithStack>().swap(mObservations);
+    return;
+  }
+  mLogStartTime = TimeStamp::Now();
+  {
+    // Scope for lock
+    IOInterposer::MonitorAutoLock lock(mMonitor);
+    while (true) {
+      while (!mShutdownRequired && mObservations.empty()) {
+        lock.Wait();
+      }
+      if (mShutdownRequired) {
+        break;
+      }
+      // Pull events off the shared array onto a local one
+      std::vector<ObservationWithStack> observationsToWrite;
+      observationsToWrite.swap(mObservations);
+
+      // Release the lock so that we're not holding anybody up during I/O
+      IOInterposer::MonitorAutoUnlock unlock(mMonitor);
+
+      // Now write the events.
+      for (auto i = observationsToWrite.begin(), e = observationsToWrite.end();
+           i != e; ++i) {
+        if (i->mObservation.ObservedOperation() == OpNextStage) {
+          PR_fprintf(fd, "%f,NEXT-STAGE\n",
+                     (TimeStamp::Now() - mLogStartTime).ToMilliseconds());
+          continue;
+        }
+        double durationMs = i->mObservation.Duration().ToMilliseconds();
+        nsAutoCString nativeFilename;
+        nativeFilename.AssignLiteral("(not available)");
+        if (!i->mFilename.IsEmpty()) {
+          if (NS_FAILED(NS_CopyUnicodeToNative(i->mFilename, nativeFilename))) {
+            nativeFilename.AssignLiteral("(conversion failed)");
+          }
+        }
+        /**
+         * Format:
+         * Start Timestamp (Milliseconds), Operation, Duration (Milliseconds), Event Source, Filename
+         */
+        if (PR_fprintf(fd, "%f,%s,%f,%s,%s\n",
+                       (i->mObservation.Start() - mLogStartTime).ToMilliseconds(),
+                       i->mObservation.ObservedOperationString(), durationMs,
+                       i->mObservation.Reference(), nativeFilename.get()) > 0) {
+          ProfilerBacktrace* stack = i->mStack;
+          if (stack) {
+            // TODO: Write out the callstack
+            //       (This will be added in a later bug)
+            profiler_free_backtrace(stack);
+          }
+        }
+      }
+    }
+  }
+  PR_Close(fd);
+}
+
+void
+MainThreadIOLoggerImpl::Observe(Observation& aObservation)
+{
+  if (!mFileName || !IsMainThread()) {
+    return;
+  }
+  IOInterposer::MonitorAutoLock lock(mMonitor);
+  if (mShutdownRequired) {
+    // The writer thread isn't running. Don't enqueue any more data.
+    return;
+  }
+  // Passing nullptr as aStack parameter for now
+  mObservations.push_back(ObservationWithStack(aObservation, nullptr));
+  lock.Notify();
+}
+
+} // namespace
+
+namespace mozilla {
+
+namespace MainThreadIOLogger {
+
+bool
+Init()
+{
+  nsAutoPtr<MainThreadIOLoggerImpl> impl(new MainThreadIOLoggerImpl());
+  if (!impl->Init()) {
+    return false;
+  }
+  sImpl = impl.forget();
+  IOInterposer::Register(IOInterposeObserver::OpAllWithStaging, sImpl);
+  return true;
+}
+
+} // namespace MainThreadIOLogger
+
+} // namespace mozilla
+
diff --git a/xpcom/build/MainThreadIOLogger.h b/xpcom/build/MainThreadIOLogger.h
new file mode 100644
index 0000000000..df9e30b53b
--- /dev/null
+++ b/xpcom/build/MainThreadIOLogger.h
@@ -0,0 +1,19 @@
+/* -*- 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/. */
+
+#ifndef mozilla_MainThreadIOLogger_h
+#define mozilla_MainThreadIOLogger_h
+
+namespace mozilla {
+namespace MainThreadIOLogger {
+
+bool Init();
+
+} // namespace MainThreadIOLogger
+} // namespace mozilla
+
+#endif // mozilla_MainThreadIOLogger_h
+
diff --git a/xpcom/build/NSPRInterposer.cpp b/xpcom/build/NSPRInterposer.cpp
new file mode 100644
index 0000000000..a7c53a97a8
--- /dev/null
+++ b/xpcom/build/NSPRInterposer.cpp
@@ -0,0 +1,185 @@
+/* -*- 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 "IOInterposer.h"
+#include "NSPRInterposer.h"
+
+#include "prio.h"
+#include "private/pprio.h"
+#include "nsDebug.h"
+#include "nscore.h"
+
+namespace {
+
+using namespace mozilla;
+
+/* Original IO methods */
+PRCloseFN sCloseFn = nullptr;
+PRReadFN  sReadFn  = nullptr;
+PRWriteFN sWriteFn = nullptr;
+PRFsyncFN sFSyncFn = nullptr;
+PRFileInfoFN sFileInfoFn = nullptr;
+PRFileInfo64FN sFileInfo64Fn = nullptr;
+
+/**
+ * RAII class for timing the duration of an NSPR I/O call and reporting the
+ * result to the IOInterposeObserver API.
+ */
+class NSPRIOAutoObservation : public IOInterposeObserver::Observation
+{
+public:
+  explicit NSPRIOAutoObservation(IOInterposeObserver::Operation aOp)
+    : IOInterposeObserver::Observation(aOp, "NSPRIOInterposer")
+  {
+  }
+
+  ~NSPRIOAutoObservation()
+  {
+    Report();
+  }
+};
+
+PRStatus PR_CALLBACK
+interposedClose(PRFileDesc* aFd)
+{
+  // If we don't have a valid original function pointer something is very wrong.
+  NS_ASSERTION(sCloseFn, "NSPR IO Interposing: sCloseFn is NULL");
+
+  NSPRIOAutoObservation timer(IOInterposeObserver::OpClose);
+  return sCloseFn(aFd);
+}
+
+int32_t PR_CALLBACK
+interposedRead(PRFileDesc* aFd, void* aBuf, int32_t aAmt)
+{
+  // If we don't have a valid original function pointer something is very wrong.
+  NS_ASSERTION(sReadFn, "NSPR IO Interposing: sReadFn is NULL");
+
+  NSPRIOAutoObservation timer(IOInterposeObserver::OpRead);
+  return sReadFn(aFd, aBuf, aAmt);
+}
+
+int32_t PR_CALLBACK
+interposedWrite(PRFileDesc* aFd, const void* aBuf, int32_t aAmt)
+{
+  // If we don't have a valid original function pointer something is very wrong.
+  NS_ASSERTION(sWriteFn, "NSPR IO Interposing: sWriteFn is NULL");
+
+  NSPRIOAutoObservation timer(IOInterposeObserver::OpWrite);
+  return sWriteFn(aFd, aBuf, aAmt);
+}
+
+PRStatus PR_CALLBACK
+interposedFSync(PRFileDesc* aFd)
+{
+  // If we don't have a valid original function pointer something is very wrong.
+  NS_ASSERTION(sFSyncFn, "NSPR IO Interposing: sFSyncFn is NULL");
+
+  NSPRIOAutoObservation timer(IOInterposeObserver::OpFSync);
+  return sFSyncFn(aFd);
+}
+
+PRStatus PR_CALLBACK
+interposedFileInfo(PRFileDesc* aFd, PRFileInfo* aInfo)
+{
+  // If we don't have a valid original function pointer something is very wrong.
+  NS_ASSERTION(sFileInfoFn, "NSPR IO Interposing: sFileInfoFn is NULL");
+
+  NSPRIOAutoObservation timer(IOInterposeObserver::OpStat);
+  return sFileInfoFn(aFd, aInfo);
+}
+
+PRStatus PR_CALLBACK
+interposedFileInfo64(PRFileDesc* aFd, PRFileInfo64* aInfo)
+{
+  // If we don't have a valid original function pointer something is very wrong.
+  NS_ASSERTION(sFileInfo64Fn, "NSPR IO Interposing: sFileInfo64Fn is NULL");
+
+  NSPRIOAutoObservation timer(IOInterposeObserver::OpStat);
+  return sFileInfo64Fn(aFd, aInfo);
+}
+
+} // namespace
+
+namespace mozilla {
+
+void
+InitNSPRIOInterposing()
+{
+  // Check that we have not interposed any of the IO methods before
+  MOZ_ASSERT(!sCloseFn && !sReadFn && !sWriteFn && !sFSyncFn && !sFileInfoFn &&
+             !sFileInfo64Fn);
+
+  // We can't actually use this assertion because we initialize this code
+  // before XPCOM is initialized, so NS_IsMainThread() always returns false.
+  // MOZ_ASSERT(NS_IsMainThread());
+
+  // Get IO methods from NSPR and const cast the structure so we can modify it.
+  PRIOMethods* methods = const_cast<PRIOMethods*>(PR_GetFileMethods());
+
+  // Something is badly wrong if we don't get IO methods... However, we don't
+  // want to crash over that in non-debug builds. This is unlikely to happen
+  // so an assert is enough, no need to report it to the caller.
+  MOZ_ASSERT(methods);
+  if (!methods) {
+    return;
+  }
+
+  // Store original functions
+  sCloseFn      = methods->close;
+  sReadFn       = methods->read;
+  sWriteFn      = methods->write;
+  sFSyncFn      = methods->fsync;
+  sFileInfoFn   = methods->fileInfo;
+  sFileInfo64Fn = methods->fileInfo64;
+
+  // Overwrite with our interposed functions
+  methods->close      = &interposedClose;
+  methods->read       = &interposedRead;
+  methods->write      = &interposedWrite;
+  methods->fsync      = &interposedFSync;
+  methods->fileInfo   = &interposedFileInfo;
+  methods->fileInfo64 = &interposedFileInfo64;
+}
+
+void
+ClearNSPRIOInterposing()
+{
+  // If we have already cleared IO interposing, or not initialized it this is
+  // actually bad.
+  MOZ_ASSERT(sCloseFn && sReadFn && sWriteFn && sFSyncFn && sFileInfoFn &&
+             sFileInfo64Fn);
+
+  // Get IO methods from NSPR and const cast the structure so we can modify it.
+  PRIOMethods* methods = const_cast<PRIOMethods*>(PR_GetFileMethods());
+
+  // Something is badly wrong if we don't get IO methods... However, we don't
+  // want to crash over that in non-debug builds. This is unlikely to happen
+  // so an assert is enough, no need to report it to the caller.
+  MOZ_ASSERT(methods);
+  if (!methods) {
+    return;
+  }
+
+  // Restore original functions
+  methods->close      = sCloseFn;
+  methods->read       = sReadFn;
+  methods->write      = sWriteFn;
+  methods->fsync      = sFSyncFn;
+  methods->fileInfo   = sFileInfoFn;
+  methods->fileInfo64 = sFileInfo64Fn;
+
+  // Forget about original functions
+  sCloseFn      = nullptr;
+  sReadFn       = nullptr;
+  sWriteFn      = nullptr;
+  sFSyncFn      = nullptr;
+  sFileInfoFn   = nullptr;
+  sFileInfo64Fn = nullptr;
+}
+
+} // namespace mozilla
+
diff --git a/xpcom/build/NSPRInterposer.h b/xpcom/build/NSPRInterposer.h
new file mode 100644
index 0000000000..2b8715077b
--- /dev/null
+++ b/xpcom/build/NSPRInterposer.h
@@ -0,0 +1,28 @@
+/* -*- 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/. */
+
+#ifndef NSPRINTERPOSER_H_
+#define NSPRINTERPOSER_H_
+
+namespace mozilla {
+
+/**
+ * Initialize IO interposing for NSPR. This will report NSPR read, writes and
+ * fsyncs to the IOInterposerObserver. It is only safe to call this from the
+ * main-thread when no other threads are running.
+ */
+void InitNSPRIOInterposing();
+
+/**
+ * Removes interception of NSPR IO methods as setup by InitNSPRIOInterposing.
+ * Note, that it is only safe to call this on the main-thread when all other
+ * threads have stopped. Which is typically the case at shutdown.
+ */
+void ClearNSPRIOInterposing();
+
+} // namespace mozilla
+
+#endif // NSPRINTERPOSER_H_
diff --git a/xpcom/build/Omnijar.cpp b/xpcom/build/Omnijar.cpp
new file mode 100644
index 0000000000..e1a8a1e5b6
--- /dev/null
+++ b/xpcom/build/Omnijar.cpp
@@ -0,0 +1,188 @@
+/* -*- 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 "Omnijar.h"
+
+#include "nsDirectoryService.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsIFile.h"
+#include "nsZipArchive.h"
+#include "nsNetUtil.h"
+
+namespace mozilla {
+
+StaticRefPtr<nsIFile> Omnijar::sPath[2];
+StaticRefPtr<nsZipArchive> Omnijar::sReader[2];
+StaticRefPtr<nsZipArchive> Omnijar::sOuterReader[2];
+bool Omnijar::sInitialized = false;
+bool Omnijar::sIsUnified = false;
+
+static const char* sProp[2] = {
+  NS_GRE_DIR, NS_XPCOM_CURRENT_PROCESS_DIR
+};
+
+#define SPROP(Type) ((Type == mozilla::Omnijar::GRE) ? sProp[GRE] : sProp[APP])
+
+void
+Omnijar::CleanUpOne(Type aType)
+{
+  if (sReader[aType]) {
+    sReader[aType]->CloseArchive();
+    sReader[aType] = nullptr;
+  }
+  if (sOuterReader[aType]) {
+    sOuterReader[aType]->CloseArchive();
+    sOuterReader[aType] = nullptr;
+  }
+  sPath[aType] = nullptr;
+}
+
+void
+Omnijar::InitOne(nsIFile* aPath, Type aType)
+{
+  nsCOMPtr<nsIFile> file;
+  if (aPath) {
+    file = aPath;
+  } else {
+    nsCOMPtr<nsIFile> dir;
+    nsDirectoryService::gService->Get(SPROP(aType), NS_GET_IID(nsIFile),
+                                      getter_AddRefs(dir));
+    NS_NAMED_LITERAL_CSTRING(kOmnijarName, NS_STRINGIFY(OMNIJAR_NAME));
+    if (NS_FAILED(dir->Clone(getter_AddRefs(file))) ||
+        NS_FAILED(file->AppendNative(kOmnijarName))) {
+      return;
+    }
+  }
+  bool isFile;
+  if (NS_FAILED(file->IsFile(&isFile)) || !isFile) {
+    // If we're not using an omni.jar for GRE, and we don't have an
+    // omni.jar for APP, check if both directories are the same.
+    if ((aType == APP) && (!sPath[GRE])) {
+      nsCOMPtr<nsIFile> greDir, appDir;
+      bool equals;
+      nsDirectoryService::gService->Get(sProp[GRE], NS_GET_IID(nsIFile),
+                                        getter_AddRefs(greDir));
+      nsDirectoryService::gService->Get(sProp[APP], NS_GET_IID(nsIFile),
+                                        getter_AddRefs(appDir));
+      if (NS_SUCCEEDED(greDir->Equals(appDir, &equals)) && equals) {
+        sIsUnified = true;
+      }
+    }
+    return;
+  }
+
+  bool equals;
+  if ((aType == APP) && (sPath[GRE]) &&
+      NS_SUCCEEDED(sPath[GRE]->Equals(file, &equals)) && equals) {
+    // If we're using omni.jar on both GRE and APP and their path
+    // is the same, we're in the unified case.
+    sIsUnified = true;
+    return;
+  }
+
+  RefPtr<nsZipArchive> zipReader = new nsZipArchive();
+  if (NS_FAILED(zipReader->OpenArchive(file))) {
+    return;
+  }
+
+  RefPtr<nsZipArchive> outerReader;
+  RefPtr<nsZipHandle> handle;
+  if (NS_SUCCEEDED(nsZipHandle::Init(zipReader, NS_STRINGIFY(OMNIJAR_NAME),
+                                     getter_AddRefs(handle)))) {
+    outerReader = zipReader;
+    zipReader = new nsZipArchive();
+    if (NS_FAILED(zipReader->OpenArchive(handle))) {
+      return;
+    }
+  }
+
+  CleanUpOne(aType);
+  sReader[aType] = zipReader;
+  sOuterReader[aType] = outerReader;
+  sPath[aType] = file;
+}
+
+void
+Omnijar::Init(nsIFile* aGrePath, nsIFile* aAppPath)
+{
+  InitOne(aGrePath, GRE);
+  InitOne(aAppPath, APP);
+  sInitialized = true;
+}
+
+void
+Omnijar::CleanUp()
+{
+  CleanUpOne(GRE);
+  CleanUpOne(APP);
+  sInitialized = false;
+}
+
+already_AddRefed<nsZipArchive>
+Omnijar::GetReader(nsIFile* aPath)
+{
+  MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+
+  bool equals;
+  nsresult rv;
+
+  if (sPath[GRE]) {
+    rv = sPath[GRE]->Equals(aPath, &equals);
+    if (NS_SUCCEEDED(rv) && equals) {
+      return IsNested(GRE) ? GetOuterReader(GRE) : GetReader(GRE);
+    }
+  }
+  if (sPath[APP]) {
+    rv = sPath[APP]->Equals(aPath, &equals);
+    if (NS_SUCCEEDED(rv) && equals) {
+      return IsNested(APP) ? GetOuterReader(APP) : GetReader(APP);
+    }
+  }
+  return nullptr;
+}
+
+nsresult
+Omnijar::GetURIString(Type aType, nsACString& aResult)
+{
+  MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+
+  aResult.Truncate();
+
+  // Return an empty string for APP in the unified case.
+  if ((aType == APP) && sIsUnified) {
+    return NS_OK;
+  }
+
+  nsAutoCString omniJarSpec;
+  if (sPath[aType]) {
+    nsresult rv = NS_GetURLSpecFromActualFile(sPath[aType], omniJarSpec);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+
+    aResult = "jar:";
+    if (IsNested(aType)) {
+      aResult += "jar:";
+    }
+    aResult += omniJarSpec;
+    aResult += "!";
+    if (IsNested(aType)) {
+      aResult += "/" NS_STRINGIFY(OMNIJAR_NAME) "!";
+    }
+  } else {
+    nsCOMPtr<nsIFile> dir;
+    nsDirectoryService::gService->Get(SPROP(aType), NS_GET_IID(nsIFile),
+                                      getter_AddRefs(dir));
+    nsresult rv = NS_GetURLSpecFromActualFile(dir, aResult);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+  aResult += "/";
+  return NS_OK;
+}
+
+} /* namespace mozilla */
diff --git a/xpcom/build/Omnijar.h b/xpcom/build/Omnijar.h
new file mode 100644
index 0000000000..35a208bae9
--- /dev/null
+++ b/xpcom/build/Omnijar.h
@@ -0,0 +1,160 @@
+/* -*- 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/. */
+
+#ifndef mozilla_Omnijar_h
+#define mozilla_Omnijar_h
+
+#include "nscore.h"
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsIFile.h"
+#include "nsZipArchive.h"
+
+#include "mozilla/StaticPtr.h"
+
+namespace mozilla {
+
+class Omnijar
+{
+private:
+  /**
+   * Store an nsIFile for an omni.jar. We can store two paths here, one
+   * for GRE (corresponding to resource://gre/) and one for APP
+   * (corresponding to resource:/// and resource://app/), but only
+   * store one when both point to the same location (unified).
+   */
+  static StaticRefPtr<nsIFile> sPath[2];
+
+  /**
+   * Cached nsZipArchives for the corresponding sPath
+   */
+  static StaticRefPtr<nsZipArchive> sReader[2];
+
+  /**
+   * Cached nsZipArchives for the outer jar, when using nested jars.
+   * Otherwise nullptr.
+   */
+  static StaticRefPtr<nsZipArchive> sOuterReader[2];
+
+  /**
+   * Has Omnijar::Init() been called?
+   */
+  static bool sInitialized;
+
+  /**
+   * Is using unified GRE/APP jar?
+   */
+  static bool sIsUnified;
+
+public:
+  enum Type
+  {
+    GRE = 0,
+    APP = 1
+  };
+
+private:
+  /**
+   * Returns whether we are using nested jars.
+   */
+  static inline bool IsNested(Type aType)
+  {
+    MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+    return !!sOuterReader[aType];
+  }
+
+  /**
+   * Returns a nsZipArchive pointer for the outer jar file when using nested
+   * jars. Returns nullptr in the same cases GetPath() would, or if not using
+   * nested jars.
+   */
+  static inline already_AddRefed<nsZipArchive> GetOuterReader(Type aType)
+  {
+    MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+    RefPtr<nsZipArchive> reader = sOuterReader[aType].get();
+    return reader.forget();
+  }
+
+public:
+  /**
+   * Returns whether SetBase has been called at least once with
+   * a valid nsIFile
+   */
+  static inline bool IsInitialized() { return sInitialized; }
+
+  /**
+   * Initializes the Omnijar API with the given directory or file for GRE and
+   * APP. Each of the paths given can be:
+   * - a file path, pointing to the omnijar file,
+   * - a directory path, pointing to a directory containing an "omni.jar" file,
+   * - nullptr for autodetection of an "omni.jar" file.
+   */
+  static void Init(nsIFile* aGrePath = nullptr, nsIFile* aAppPath = nullptr);
+
+  /**
+   * Cleans up the Omnijar API
+   */
+  static void CleanUp();
+
+  /**
+   * Returns an nsIFile pointing to the omni.jar file for GRE or APP.
+   * Returns nullptr when there is no corresponding omni.jar.
+   * Also returns nullptr for APP in the unified case.
+   */
+  static inline already_AddRefed<nsIFile> GetPath(Type aType)
+  {
+    MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+    nsCOMPtr<nsIFile> path = sPath[aType].get();
+    return path.forget();
+  }
+
+  /**
+   * Returns whether GRE or APP use an omni.jar. Returns PR_False for
+   * APP when using an omni.jar in the unified case.
+   */
+  static inline bool HasOmnijar(Type aType)
+  {
+    MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+    return !!sPath[aType];
+  }
+
+  /**
+   * Returns a nsZipArchive pointer for the omni.jar file for GRE or
+   * APP. Returns nullptr in the same cases GetPath() would.
+   */
+  static inline already_AddRefed<nsZipArchive> GetReader(Type aType)
+  {
+    MOZ_ASSERT(IsInitialized(), "Omnijar not initialized");
+    RefPtr<nsZipArchive> reader = sReader[aType].get();
+    return reader.forget();
+  }
+
+  /**
+   * Returns a nsZipArchive pointer for the given path IAOI the given
+   * path is the omni.jar for either GRE or APP.
+   */
+  static already_AddRefed<nsZipArchive> GetReader(nsIFile* aPath);
+
+  /**
+   * Returns the URI string corresponding to the omni.jar or directory
+   * for GRE or APP. i.e. jar:/path/to/omni.jar!/ for omni.jar and
+   * /path/to/base/dir/ otherwise. Returns an empty string for APP in
+   * the unified case.
+   * The returned URI is guaranteed to end with a slash.
+   */
+  static nsresult GetURIString(Type aType, nsACString& aResult);
+
+private:
+  /**
+   * Used internally, respectively by Init() and CleanUp()
+   */
+  static void InitOne(nsIFile* aPath, Type aType);
+  static void CleanUpOne(Type aType);
+}; /* class Omnijar */
+
+} /* namespace mozilla */
+
+#endif /* mozilla_Omnijar_h */
diff --git a/xpcom/build/PoisonIOInterposer.h b/xpcom/build/PoisonIOInterposer.h
new file mode 100644
index 0000000000..4a4d1426db
--- /dev/null
+++ b/xpcom/build/PoisonIOInterposer.h
@@ -0,0 +1,91 @@
+/* -*- 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/. */
+
+#ifndef mozilla_PoisonIOInterposer_h
+#define mozilla_PoisonIOInterposer_h
+
+#include "mozilla/Types.h"
+#include <stdio.h>
+
+MOZ_BEGIN_EXTERN_C
+
+/** Register file handle to be ignored by poisoning IO interposer. This function
+ * and the corresponding UnRegister function are necessary for exchange of handles
+ * between binaries not using the same CRT on Windows (which happens when one of
+ * them links the static CRT). In such cases, giving file descriptors or FILEs
+ * doesn't work because _get_osfhandle fails with "invalid parameter". */
+void MozillaRegisterDebugHandle(intptr_t aHandle);
+
+/** Register file descriptor to be ignored by poisoning IO interposer */
+void MozillaRegisterDebugFD(int aFd);
+
+/** Register file to be ignored by poisoning IO interposer */
+void MozillaRegisterDebugFILE(FILE* aFile);
+
+/** Unregister file handle from being ignored by poisoning IO interposer */
+void MozillaUnRegisterDebugHandle(intptr_t aHandle);
+
+/** Unregister file descriptor from being ignored by poisoning IO interposer */
+void MozillaUnRegisterDebugFD(int aFd);
+
+/** Unregister file from being ignored by poisoning IO interposer */
+void MozillaUnRegisterDebugFILE(FILE* aFile);
+
+MOZ_END_EXTERN_C
+
+#if defined(XP_WIN) || defined(XP_MACOSX)
+
+#ifdef __cplusplus
+namespace mozilla {
+
+/**
+ * Check if a file is registered as a debug file.
+ */
+bool IsDebugFile(intptr_t aFileID);
+
+/**
+ * Initialize IO poisoning, this is only safe to do on the main-thread when no
+ * other threads are running.
+ *
+ * Please, note that this probably has performance implications as all
+ */
+void InitPoisonIOInterposer();
+
+#ifdef XP_MACOSX
+/**
+ * Check that writes are dirty before reporting I/O (Mac OS X only)
+ * This is necessary for late-write checks on Mac OS X, but reading the buffer
+ * from file to see if we're writing dirty bits is expensive, so we don't want
+ * to do this for everything else that uses
+ */
+void OnlyReportDirtyWrites();
+#endif /* XP_MACOSX */
+
+/**
+ * Clear IO poisoning, this is only safe to do on the main-thread when no other
+ * threads are running.
+ */
+void ClearPoisonIOInterposer();
+
+} // namespace mozilla
+#endif /* __cplusplus */
+
+#else /* XP_WIN || XP_MACOSX */
+
+#ifdef __cplusplus
+namespace mozilla {
+inline bool IsDebugFile(intptr_t aFileID) { return true; }
+inline void InitPoisonIOInterposer() {}
+inline void ClearPoisonIOInterposer() {}
+#ifdef XP_MACOSX
+inline void OnlyReportDirtyWrites() {}
+#endif /* XP_MACOSX */
+} // namespace mozilla
+#endif /* __cplusplus */
+
+#endif /* XP_WIN || XP_MACOSX */
+
+#endif // mozilla_PoisonIOInterposer_h
diff --git a/xpcom/build/PoisonIOInterposerBase.cpp b/xpcom/build/PoisonIOInterposerBase.cpp
new file mode 100644
index 0000000000..0e5754392e
--- /dev/null
+++ b/xpcom/build/PoisonIOInterposerBase.cpp
@@ -0,0 +1,291 @@
+/* -*- 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 "mozilla/Mutex.h"
+#include "mozilla/Scoped.h"
+#include "mozilla/UniquePtr.h"
+
+#include <algorithm>
+
+#include "PoisonIOInterposer.h"
+
+#ifdef MOZ_REPLACE_MALLOC
+#include "replace_malloc_bridge.h"
+#endif
+
+// Auxiliary method to convert file descriptors to ids
+#if defined(XP_WIN32)
+#include <io.h>
+inline intptr_t
+FileDescriptorToHandle(int aFd)
+{
+  return _get_osfhandle(aFd);
+}
+#else
+inline intptr_t
+FileDescriptorToHandle(int aFd)
+{
+  return aFd;
+}
+#endif /* if not XP_WIN32 */
+
+using namespace mozilla;
+
+namespace {
+struct DebugFilesAutoLockTraits
+{
+  typedef PRLock* type;
+  typedef const PRLock* const_type;
+  static const_type empty() { return nullptr; }
+  static void release(type aL) { PR_Unlock(aL); }
+};
+
+class DebugFilesAutoLock : public Scoped<DebugFilesAutoLockTraits>
+{
+  static PRLock* Lock;
+public:
+  static void Clear();
+  static PRLock* getDebugFileIDsLock()
+  {
+    // On windows this static is not thread safe, but we know that the first
+    // call is from
+    // * An early registration of a debug FD or
+    // * The call to InitWritePoisoning.
+    // Since the early debug FDs are logs created early in the main thread
+    // and no writes are trapped before InitWritePoisoning, we are safe.
+    if (!Lock) {
+      Lock = PR_NewLock();
+    }
+
+    // We have to use something lower level than a mutex. If we don't, we
+    // can get recursive in here when called from logging a call to free.
+    return Lock;
+  }
+
+  DebugFilesAutoLock()
+    : Scoped<DebugFilesAutoLockTraits>(getDebugFileIDsLock())
+  {
+    PR_Lock(get());
+  }
+};
+
+PRLock* DebugFilesAutoLock::Lock;
+void
+DebugFilesAutoLock::Clear()
+{
+  MOZ_ASSERT(Lock != nullptr);
+  Lock = nullptr;
+}
+
+// The ChunkedList<T> class implements, at the high level, a non-iterable
+// list of instances of T. Its goal is to be somehow minimalist for the
+// use case of storing the debug files handles here, with the property of
+// not requiring a lock to look up whether it contains a specific value.
+// It is also chunked in blocks of chunk_size bytes so that its
+// initialization doesn't require a memory allocation, while keeping the
+// possibility to increase its size as necessary. Note that chunks are
+// never deallocated (except in the destructor).
+// All operations are essentially O(N) but N is not expected to be large
+// enough to matter.
+template <typename T, size_t chunk_size=64>
+class ChunkedList {
+  struct ListChunk {
+    static const size_t kLength = \
+      (chunk_size - sizeof(ListChunk*)) / sizeof(mozilla::Atomic<T>);
+
+    mozilla::Atomic<T> mElements[kLength];
+    mozilla::UniquePtr<ListChunk> mNext;
+
+    ListChunk() : mNext(nullptr) {}
+  };
+
+  ListChunk mList;
+  mozilla::Atomic<size_t> mLength;
+
+public:
+  ChunkedList() : mLength(0) {}
+
+  ~ChunkedList() {
+    // There can be writes happening after this destructor runs, so keep
+    // the list contents and don't reset mLength. But if there are more
+    // elements left than the first chunk can hold, then all hell breaks
+    // loose for any write that would happen after that because any extra
+    // chunk would be deallocated, so just crash in that case.
+    MOZ_RELEASE_ASSERT(mLength <= ListChunk::kLength);
+  }
+
+  // Add an element at the end of the last chunk of the list. Create a new
+  // chunk if there is not enough room.
+  // This is not thread-safe with another thread calling Add or Remove.
+  void Add(T aValue)
+  {
+    ListChunk *list = &mList;
+    size_t position = mLength;
+    for (; position >= ListChunk::kLength; position -= ListChunk::kLength) {
+      if (!list->mNext) {
+        list->mNext.reset(new ListChunk());
+      }
+      list = list->mNext.get();
+    }
+    // Use an order of operations that ensures any racing Contains call
+    // can't be hurt.
+    list->mElements[position] = aValue;
+    mLength++;
+  }
+
+  // Remove an element from the list by replacing it with the last element
+  // of the list, and then shrinking the list.
+  // This is not thread-safe with another thread calling Add or Remove.
+  void Remove(T aValue)
+  {
+    if (!mLength) {
+      return;
+    }
+    ListChunk *list = &mList;
+    size_t last = mLength - 1;
+    do {
+      size_t position = 0;
+      // Look for an element matching the given value.
+      for (; position < ListChunk::kLength; position++) {
+        if (aValue == list->mElements[position]) {
+          ListChunk *last_list = list;
+          // Look for the last element in the list, starting from where we are
+          // instead of starting over.
+          for (; last >= ListChunk::kLength; last -= ListChunk::kLength) {
+            last_list = last_list->mNext.get();
+          }
+          // Use an order of operations that ensures any racing Contains call
+          // can't be hurt.
+          T value = last_list->mElements[last];
+          list->mElements[position] = value;
+          mLength--;
+          return;
+        }
+      }
+      last -= ListChunk::kLength;
+      list = list->mNext.get();
+    } while (list);
+  }
+
+  // Returns whether the list contains the given value. It is meant to be safe
+  // to use without locking, with the tradeoff of being not entirely accurate
+  // if another thread adds or removes an element while this function runs.
+  bool Contains(T aValue)
+  {
+    ListChunk *list = &mList;
+    // Fix the range of the lookup to whatever the list length is when the
+    // function is called.
+    size_t length = mLength;
+    do {
+      size_t list_length = ListChunk::kLength;
+      list_length = std::min(list_length, length);
+      for (size_t position = 0; position < list_length; position++) {
+        if (aValue == list->mElements[position]) {
+          return true;
+        }
+      }
+      length -= ListChunk::kLength;
+      list = list->mNext.get();
+    } while (list);
+
+    return false;
+  }
+};
+
+typedef ChunkedList<intptr_t> FdList;
+
+// Return a list used to hold the IDs of the current debug files. On unix
+// an ID is a file descriptor. On Windows it is a file HANDLE.
+FdList&
+getDebugFileIDs()
+{
+  static FdList DebugFileIDs;
+  return DebugFileIDs;
+}
+
+
+} // namespace
+
+namespace mozilla {
+
+// Auxiliary Method to test if a file descriptor is registered to be ignored
+// by the poisoning IO interposer
+bool
+IsDebugFile(intptr_t aFileID)
+{
+  return getDebugFileIDs().Contains(aFileID);
+}
+
+} // namespace mozilla
+
+extern "C" {
+
+void
+MozillaRegisterDebugHandle(intptr_t aHandle)
+{
+  DebugFilesAutoLock lockedScope;
+  FdList& DebugFileIDs = getDebugFileIDs();
+  MOZ_ASSERT(!DebugFileIDs.Contains(aHandle));
+  DebugFileIDs.Add(aHandle);
+}
+
+void
+MozillaRegisterDebugFD(int aFd)
+{
+  MozillaRegisterDebugHandle(FileDescriptorToHandle(aFd));
+}
+
+void
+MozillaRegisterDebugFILE(FILE* aFile)
+{
+  int fd = fileno(aFile);
+  if (fd == 1 || fd == 2) {
+    return;
+  }
+  MozillaRegisterDebugFD(fd);
+}
+
+void
+MozillaUnRegisterDebugHandle(intptr_t aHandle)
+{
+  DebugFilesAutoLock lockedScope;
+  FdList& DebugFileIDs = getDebugFileIDs();
+  MOZ_ASSERT(DebugFileIDs.Contains(aHandle));
+  DebugFileIDs.Remove(aHandle);
+}
+
+void
+MozillaUnRegisterDebugFD(int aFd)
+{
+  MozillaUnRegisterDebugHandle(FileDescriptorToHandle(aFd));
+}
+
+void
+MozillaUnRegisterDebugFILE(FILE* aFile)
+{
+  int fd = fileno(aFile);
+  if (fd == 1 || fd == 2) {
+    return;
+  }
+  fflush(aFile);
+  MozillaUnRegisterDebugFD(fd);
+}
+
+}  // extern "C"
+
+#ifdef MOZ_REPLACE_MALLOC
+void
+DebugFdRegistry::RegisterHandle(intptr_t aHandle)
+{
+  MozillaRegisterDebugHandle(aHandle);
+}
+
+void
+DebugFdRegistry::UnRegisterHandle(intptr_t aHandle)
+{
+  MozillaUnRegisterDebugHandle(aHandle);
+}
+#endif
diff --git a/xpcom/build/PoisonIOInterposerMac.cpp b/xpcom/build/PoisonIOInterposerMac.cpp
new file mode 100644
index 0000000000..9662694953
--- /dev/null
+++ b/xpcom/build/PoisonIOInterposerMac.cpp
@@ -0,0 +1,386 @@
+/* -*- 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 "PoisonIOInterposer.h"
+#include "mach_override.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/IOInterposer.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/ProcessedStack.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "nsPrintfCString.h"
+#include "mozilla/StackWalk.h"
+#include "nsTraceRefcnt.h"
+#include "plstr.h"
+#include "prio.h"
+
+#include <algorithm>
+#include <vector>
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <aio.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#ifdef MOZ_REPLACE_MALLOC
+#include "replace_malloc_bridge.h"
+#endif
+
+namespace {
+
+using namespace mozilla;
+
+// Bit tracking if poisoned writes are enabled
+static bool sIsEnabled = false;
+
+// Check if writes are dirty before reporting IO
+static bool sOnlyReportDirtyWrites = false;
+
+// Routines for write validation
+bool IsValidWrite(int aFd, const void* aWbuf, size_t aCount);
+bool IsIPCWrite(int aFd, const struct stat& aBuf);
+
+/******************************** IO AutoTimer ********************************/
+
+/**
+ * RAII class for timing the duration of an I/O call and reporting the result
+ * to the IOInterposeObserver API.
+ */
+class MacIOAutoObservation : public IOInterposeObserver::Observation
+{
+public:
+  MacIOAutoObservation(IOInterposeObserver::Operation aOp, int aFd)
+    : IOInterposeObserver::Observation(aOp, sReference, sIsEnabled &&
+                                       !IsDebugFile(aFd))
+    , mFd(aFd)
+    , mHasQueriedFilename(false)
+    , mFilename(nullptr)
+  {
+  }
+
+  MacIOAutoObservation(IOInterposeObserver::Operation aOp, int aFd,
+                       const void* aBuf, size_t aCount)
+    : IOInterposeObserver::Observation(aOp, sReference, sIsEnabled &&
+                                       !IsDebugFile(aFd) &&
+                                       IsValidWrite(aFd, aBuf, aCount))
+    , mFd(aFd)
+    , mHasQueriedFilename(false)
+    , mFilename(nullptr)
+  {
+  }
+
+  // Custom implementation of IOInterposeObserver::Observation::Filename
+  const char16_t* Filename() override;
+
+  ~MacIOAutoObservation()
+  {
+    Report();
+    if (mFilename) {
+      free(mFilename);
+      mFilename = nullptr;
+    }
+  }
+
+private:
+  int                 mFd;
+  bool                mHasQueriedFilename;
+  char16_t*           mFilename;
+  static const char*  sReference;
+};
+
+const char* MacIOAutoObservation::sReference = "PoisonIOInterposer";
+
+// Get filename for this observation
+const char16_t*
+MacIOAutoObservation::Filename()
+{
+  // If mHasQueriedFilename is true, then we already have it
+  if (mHasQueriedFilename) {
+    return mFilename;
+  }
+  char filename[MAXPATHLEN];
+  if (fcntl(mFd, F_GETPATH, filename) != -1) {
+    mFilename = UTF8ToNewUnicode(nsDependentCString(filename));
+  } else {
+    mFilename = nullptr;
+  }
+  mHasQueriedFilename = true;
+
+  // Return filename
+  return mFilename;
+}
+
+/****************************** Write Validation ******************************/
+
+// We want to detect "actual" writes, not IPC. Some IPC mechanisms are
+// implemented with file descriptors, so filter them out.
+bool
+IsIPCWrite(int aFd, const struct stat& aBuf)
+{
+  if ((aBuf.st_mode & S_IFMT) == S_IFIFO) {
+    return true;
+  }
+
+  if ((aBuf.st_mode & S_IFMT) != S_IFSOCK) {
+    return false;
+  }
+
+  sockaddr_storage address;
+  socklen_t len = sizeof(address);
+  if (getsockname(aFd, (sockaddr*)&address, &len) != 0) {
+    return true; // Ignore the aFd if we can't find what it is.
+  }
+
+  return address.ss_family == AF_UNIX;
+}
+
+// We want to report actual disk IO not things that don't move bits on the disk
+bool
+IsValidWrite(int aFd, const void* aWbuf, size_t aCount)
+{
+  // Ignore writes of zero bytes, Firefox does some during shutdown.
+  if (aCount == 0) {
+    return false;
+  }
+
+  {
+    struct stat buf;
+    int rv = fstat(aFd, &buf);
+    if (rv != 0) {
+      return true;
+    }
+
+    if (IsIPCWrite(aFd, buf)) {
+      return false;
+    }
+  }
+
+  // For writev we pass a nullptr aWbuf. We should only get here from
+  // dbm, and it uses write, so assert that we have aWbuf.
+  if (!aWbuf) {
+    return true;
+  }
+
+  // Break, here if we're allowed to report non-dirty writes
+  if (!sOnlyReportDirtyWrites) {
+    return true;
+  }
+
+  // As a really bad hack, accept writes that don't change the on disk
+  // content. This is needed because dbm doesn't keep track of dirty bits
+  // and can end up writing the same data to disk twice. Once when the
+  // user (nss) asks it to sync and once when closing the database.
+  auto wbuf2 = MakeUniqueFallible<char[]>(aCount);
+  if (!wbuf2) {
+    return true;
+  }
+  off_t pos = lseek(aFd, 0, SEEK_CUR);
+  if (pos == -1) {
+    return true;
+  }
+  ssize_t r = read(aFd, wbuf2.get(), aCount);
+  if (r < 0 || (size_t)r != aCount) {
+    return true;
+  }
+  int cmp = memcmp(aWbuf, wbuf2.get(), aCount);
+  if (cmp != 0) {
+    return true;
+  }
+  off_t pos2 = lseek(aFd, pos, SEEK_SET);
+  if (pos2 != pos) {
+    return true;
+  }
+
+  // Otherwise this is not a valid write
+  return false;
+}
+
+/*************************** Function Interception  ***************************/
+
+/** Structure for declaration of function override */
+struct FuncData
+{
+  const char* Name;      // Name of the function for the ones we use dlsym
+  const void* Wrapper;   // The function that we will replace 'Function' with
+  void* Function;        // The function that will be replaced with 'Wrapper'
+  void* Buffer;          // Will point to the jump buffer that lets us call
+                         // 'Function' after it has been replaced.
+};
+
+// Wrap aio_write. We have not seen it before, so just assert/report it.
+typedef ssize_t (*aio_write_t)(struct aiocb* aAioCbp);
+ssize_t wrap_aio_write(struct aiocb* aAioCbp);
+FuncData aio_write_data = { 0, (void*)wrap_aio_write, (void*)aio_write };
+ssize_t
+wrap_aio_write(struct aiocb* aAioCbp)
+{
+  MacIOAutoObservation timer(IOInterposeObserver::OpWrite,
+                             aAioCbp->aio_fildes);
+
+  aio_write_t old_write = (aio_write_t)aio_write_data.Buffer;
+  return old_write(aAioCbp);
+}
+
+// Wrap pwrite-like functions.
+// We have not seen them before, so just assert/report it.
+typedef ssize_t (*pwrite_t)(int aFd, const void* buf, size_t aNumBytes,
+                            off_t aOffset);
+template<FuncData& foo>
+ssize_t
+wrap_pwrite_temp(int aFd, const void* aBuf, size_t aNumBytes, off_t aOffset)
+{
+  MacIOAutoObservation timer(IOInterposeObserver::OpWrite, aFd);
+  pwrite_t old_write = (pwrite_t)foo.Buffer;
+  return old_write(aFd, aBuf, aNumBytes, aOffset);
+}
+
+// Define a FuncData for a pwrite-like functions.
+#define DEFINE_PWRITE_DATA(X, NAME)                                        \
+FuncData X ## _data = { NAME, (void*) wrap_pwrite_temp<X ## _data> };      \
+
+// This exists everywhere.
+DEFINE_PWRITE_DATA(pwrite, "pwrite")
+// These exist on 32 bit OS X
+DEFINE_PWRITE_DATA(pwrite_NOCANCEL_UNIX2003, "pwrite$NOCANCEL$UNIX2003");
+DEFINE_PWRITE_DATA(pwrite_UNIX2003, "pwrite$UNIX2003");
+// This exists on 64 bit OS X
+DEFINE_PWRITE_DATA(pwrite_NOCANCEL, "pwrite$NOCANCEL");
+
+
+typedef ssize_t (*writev_t)(int aFd, const struct iovec* aIov, int aIovCount);
+template<FuncData& foo>
+ssize_t
+wrap_writev_temp(int aFd, const struct iovec* aIov, int aIovCount)
+{
+  MacIOAutoObservation timer(IOInterposeObserver::OpWrite, aFd, nullptr,
+                             aIovCount);
+  writev_t old_write = (writev_t)foo.Buffer;
+  return old_write(aFd, aIov, aIovCount);
+}
+
+// Define a FuncData for a writev-like functions.
+#define DEFINE_WRITEV_DATA(X, NAME)                                   \
+FuncData X ## _data = { NAME, (void*) wrap_writev_temp<X ## _data> }; \
+
+// This exists everywhere.
+DEFINE_WRITEV_DATA(writev, "writev");
+// These exist on 32 bit OS X
+DEFINE_WRITEV_DATA(writev_NOCANCEL_UNIX2003, "writev$NOCANCEL$UNIX2003");
+DEFINE_WRITEV_DATA(writev_UNIX2003, "writev$UNIX2003");
+// This exists on 64 bit OS X
+DEFINE_WRITEV_DATA(writev_NOCANCEL, "writev$NOCANCEL");
+
+typedef ssize_t (*write_t)(int aFd, const void* aBuf, size_t aCount);
+template<FuncData& foo>
+ssize_t
+wrap_write_temp(int aFd, const void* aBuf, size_t aCount)
+{
+  MacIOAutoObservation timer(IOInterposeObserver::OpWrite, aFd, aBuf, aCount);
+  write_t old_write = (write_t)foo.Buffer;
+  return old_write(aFd, aBuf, aCount);
+}
+
+// Define a FuncData for a write-like functions.
+#define DEFINE_WRITE_DATA(X, NAME)                                   \
+FuncData X ## _data = { NAME, (void*) wrap_write_temp<X ## _data> }; \
+
+// This exists everywhere.
+DEFINE_WRITE_DATA(write, "write");
+// These exist on 32 bit OS X
+DEFINE_WRITE_DATA(write_NOCANCEL_UNIX2003, "write$NOCANCEL$UNIX2003");
+DEFINE_WRITE_DATA(write_UNIX2003, "write$UNIX2003");
+// This exists on 64 bit OS X
+DEFINE_WRITE_DATA(write_NOCANCEL, "write$NOCANCEL");
+
+FuncData* Functions[] = {
+  &aio_write_data,
+
+  &pwrite_data,
+  &pwrite_NOCANCEL_UNIX2003_data,
+  &pwrite_UNIX2003_data,
+  &pwrite_NOCANCEL_data,
+
+  &write_data,
+  &write_NOCANCEL_UNIX2003_data,
+  &write_UNIX2003_data,
+  &write_NOCANCEL_data,
+
+  &writev_data,
+  &writev_NOCANCEL_UNIX2003_data,
+  &writev_UNIX2003_data,
+  &writev_NOCANCEL_data
+};
+
+const int NumFunctions = ArrayLength(Functions);
+
+} // namespace
+
+/******************************** IO Poisoning ********************************/
+
+namespace mozilla {
+
+void
+InitPoisonIOInterposer()
+{
+  // Enable reporting from poisoned write methods
+  sIsEnabled = true;
+
+  // Make sure we only poison writes once!
+  static bool WritesArePoisoned = false;
+  if (WritesArePoisoned) {
+    return;
+  }
+  WritesArePoisoned = true;
+
+  // stdout and stderr are OK.
+  MozillaRegisterDebugFD(1);
+  MozillaRegisterDebugFD(2);
+
+#ifdef MOZ_REPLACE_MALLOC
+  // The contract with InitDebugFd is that the given registry can be used
+  // at any moment, so the instance needs to persist longer than the scope
+  // of this functions.
+  static DebugFdRegistry registry;
+  ReplaceMalloc::InitDebugFd(registry);
+#endif
+
+  for (int i = 0; i < NumFunctions; ++i) {
+    FuncData* d = Functions[i];
+    if (!d->Function) {
+      d->Function = dlsym(RTLD_DEFAULT, d->Name);
+    }
+    if (!d->Function) {
+      continue;
+    }
+    DebugOnly<mach_error_t> t = mach_override_ptr(d->Function, d->Wrapper,
+                                                  &d->Buffer);
+    MOZ_ASSERT(t == err_none);
+  }
+}
+
+void
+OnlyReportDirtyWrites()
+{
+  sOnlyReportDirtyWrites = true;
+}
+
+void
+ClearPoisonIOInterposer()
+{
+  // Not sure how or if we can unpoison the functions. Would be nice, but no
+  // worries we won't need to do this anyway.
+  sIsEnabled = false;
+}
+
+} // namespace mozilla
diff --git a/xpcom/build/PoisonIOInterposerStub.cpp b/xpcom/build/PoisonIOInterposerStub.cpp
new file mode 100644
index 0000000000..1f3daa3539
--- /dev/null
+++ b/xpcom/build/PoisonIOInterposerStub.cpp
@@ -0,0 +1,16 @@
+/* -*- 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 <stdio.h>
+
+extern "C" {
+
+void MozillaRegisterDebugFD(int aFd) {}
+void MozillaRegisterDebugFILE(FILE* aFile) {}
+void MozillaUnRegisterDebugFD(int aFd) {}
+void MozillaUnRegisterDebugFILE(FILE* aFile) {}
+
+}  // extern "C"
diff --git a/xpcom/build/PoisonIOInterposerWin.cpp b/xpcom/build/PoisonIOInterposerWin.cpp
new file mode 100644
index 0000000000..752743b345
--- /dev/null
+++ b/xpcom/build/PoisonIOInterposerWin.cpp
@@ -0,0 +1,501 @@
+/* -*- 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 "PoisonIOInterposer.h"
+
+#include <algorithm>
+#include <stdio.h>
+#include <vector>
+
+#include <io.h>
+#include <windows.h>
+#include <winternl.h>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/FileUtilsWin.h"
+#include "mozilla/IOInterposer.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/TimeStamp.h"
+#include "nsTArray.h"
+#include "nsWindowsDllInterceptor.h"
+#include "plstr.h"
+
+#ifdef MOZ_REPLACE_MALLOC
+#include "replace_malloc_bridge.h"
+#endif
+
+using namespace mozilla;
+
+namespace {
+
+// Keep track of poisoned state. Notice that there is no reason to lock access
+// to this variable as it's only changed in InitPoisonIOInterposer and
+// ClearPoisonIOInterposer which may only be called on the main-thread when no
+// other threads are running.
+static bool sIOPoisoned = false;
+
+/************************ Internal NT API Declarations ************************/
+
+/*
+ * Function pointer declaration for internal NT routine to create/open files.
+ * For documentation on the NtCreateFile routine, see MSDN.
+ */
+typedef NTSTATUS (NTAPI* NtCreateFileFn)(
+  PHANDLE aFileHandle,
+  ACCESS_MASK aDesiredAccess,
+  POBJECT_ATTRIBUTES aObjectAttributes,
+  PIO_STATUS_BLOCK aIoStatusBlock,
+  PLARGE_INTEGER aAllocationSize,
+  ULONG aFileAttributes,
+  ULONG aShareAccess,
+  ULONG aCreateDisposition,
+  ULONG aCreateOptions,
+  PVOID aEaBuffer,
+  ULONG aEaLength);
+
+/**
+ * Function pointer declaration for internal NT routine to read data from file.
+ * For documentation on the NtReadFile routine, see ZwReadFile on MSDN.
+ */
+typedef NTSTATUS (NTAPI* NtReadFileFn)(
+  HANDLE aFileHandle,
+  HANDLE aEvent,
+  PIO_APC_ROUTINE aApc,
+  PVOID aApcCtx,
+  PIO_STATUS_BLOCK aIoStatus,
+  PVOID aBuffer,
+  ULONG aLength,
+  PLARGE_INTEGER aOffset,
+  PULONG aKey);
+
+/**
+ * Function pointer declaration for internal NT routine to read data from file.
+ * No documentation exists, see wine sources for details.
+ */
+typedef NTSTATUS (NTAPI* NtReadFileScatterFn)(
+  HANDLE aFileHandle,
+  HANDLE aEvent,
+  PIO_APC_ROUTINE aApc,
+  PVOID aApcCtx,
+  PIO_STATUS_BLOCK aIoStatus,
+  FILE_SEGMENT_ELEMENT* aSegments,
+  ULONG aLength,
+  PLARGE_INTEGER aOffset,
+  PULONG aKey);
+
+/**
+ * Function pointer declaration for internal NT routine to write data to file.
+ * For documentation on the NtWriteFile routine, see ZwWriteFile on MSDN.
+ */
+typedef NTSTATUS (NTAPI* NtWriteFileFn)(
+  HANDLE aFileHandle,
+  HANDLE aEvent,
+  PIO_APC_ROUTINE aApc,
+  PVOID aApcCtx,
+  PIO_STATUS_BLOCK aIoStatus,
+  PVOID aBuffer,
+  ULONG aLength,
+  PLARGE_INTEGER aOffset,
+  PULONG aKey);
+
+/**
+ * Function pointer declaration for internal NT routine to write data to file.
+ * No documentation exists, see wine sources for details.
+ */
+typedef NTSTATUS (NTAPI* NtWriteFileGatherFn)(
+  HANDLE aFileHandle,
+  HANDLE aEvent,
+  PIO_APC_ROUTINE aApc,
+  PVOID aApcCtx,
+  PIO_STATUS_BLOCK aIoStatus,
+  FILE_SEGMENT_ELEMENT* aSegments,
+  ULONG aLength,
+  PLARGE_INTEGER aOffset,
+  PULONG aKey);
+
+/**
+ * Function pointer declaration for internal NT routine to flush to disk.
+ * For documentation on the NtFlushBuffersFile routine, see ZwFlushBuffersFile
+ * on MSDN.
+ */
+typedef NTSTATUS (NTAPI* NtFlushBuffersFileFn)(
+  HANDLE aFileHandle,
+  PIO_STATUS_BLOCK aIoStatusBlock);
+
+typedef struct _FILE_NETWORK_OPEN_INFORMATION* PFILE_NETWORK_OPEN_INFORMATION;
+/**
+ * Function pointer delaration for internal NT routine to query file attributes.
+ * (equivalent to stat)
+ */
+typedef NTSTATUS (NTAPI* NtQueryFullAttributesFileFn)(
+  POBJECT_ATTRIBUTES aObjectAttributes,
+  PFILE_NETWORK_OPEN_INFORMATION aFileInformation);
+
+/*************************** Auxiliary Declarations ***************************/
+
+/**
+ * RAII class for timing the duration of an I/O call and reporting the result
+ * to the IOInterposeObserver API.
+ */
+class WinIOAutoObservation : public IOInterposeObserver::Observation
+{
+public:
+  WinIOAutoObservation(IOInterposeObserver::Operation aOp,
+                       HANDLE aFileHandle, const LARGE_INTEGER* aOffset)
+    : IOInterposeObserver::Observation(
+        aOp, sReference, !IsDebugFile(reinterpret_cast<intptr_t>(aFileHandle)))
+    , mFileHandle(aFileHandle)
+    , mHasQueriedFilename(false)
+    , mFilename(nullptr)
+  {
+    if (mShouldReport) {
+      mOffset.QuadPart = aOffset ? aOffset->QuadPart : 0;
+    }
+  }
+
+  WinIOAutoObservation(IOInterposeObserver::Operation aOp, nsAString& aFilename)
+    : IOInterposeObserver::Observation(aOp, sReference)
+    , mFileHandle(nullptr)
+    , mHasQueriedFilename(false)
+    , mFilename(nullptr)
+  {
+    if (mShouldReport) {
+      nsAutoString dosPath;
+      if (NtPathToDosPath(aFilename, dosPath)) {
+        mFilename = ToNewUnicode(dosPath);
+        mHasQueriedFilename = true;
+      }
+      mOffset.QuadPart = 0;
+    }
+  }
+
+  // Custom implementation of IOInterposeObserver::Observation::Filename
+  const char16_t* Filename() override;
+
+  ~WinIOAutoObservation()
+  {
+    Report();
+    if (mFilename) {
+      MOZ_ASSERT(mHasQueriedFilename);
+      free(mFilename);
+      mFilename = nullptr;
+    }
+  }
+
+private:
+  HANDLE              mFileHandle;
+  LARGE_INTEGER       mOffset;
+  bool                mHasQueriedFilename;
+  char16_t*           mFilename;
+  static const char*  sReference;
+};
+
+const char* WinIOAutoObservation::sReference = "PoisonIOInterposer";
+
+// Get filename for this observation
+const char16_t*
+WinIOAutoObservation::Filename()
+{
+  // If mHasQueriedFilename is true, then filename is already stored in mFilename
+  if (mHasQueriedFilename) {
+    return mFilename;
+  }
+
+  nsAutoString utf16Filename;
+  if (HandleToFilename(mFileHandle, mOffset, utf16Filename)) {
+    // Heap allocate with leakable memory
+    mFilename = ToNewUnicode(utf16Filename);
+  }
+  mHasQueriedFilename = true;
+
+  // Return filename
+  return mFilename;
+}
+
+/*************************** IO Interposing Methods ***************************/
+
+// Function pointers to original functions
+static NtCreateFileFn         gOriginalNtCreateFile;
+static NtReadFileFn           gOriginalNtReadFile;
+static NtReadFileScatterFn    gOriginalNtReadFileScatter;
+static NtWriteFileFn          gOriginalNtWriteFile;
+static NtWriteFileGatherFn    gOriginalNtWriteFileGather;
+static NtFlushBuffersFileFn   gOriginalNtFlushBuffersFile;
+static NtQueryFullAttributesFileFn gOriginalNtQueryFullAttributesFile;
+
+static NTSTATUS NTAPI
+InterposedNtCreateFile(PHANDLE aFileHandle,
+                       ACCESS_MASK aDesiredAccess,
+                       POBJECT_ATTRIBUTES aObjectAttributes,
+                       PIO_STATUS_BLOCK aIoStatusBlock,
+                       PLARGE_INTEGER aAllocationSize,
+                       ULONG aFileAttributes,
+                       ULONG aShareAccess,
+                       ULONG aCreateDisposition,
+                       ULONG aCreateOptions,
+                       PVOID aEaBuffer,
+                       ULONG aEaLength)
+{
+  // Report IO
+  const wchar_t* buf =
+    aObjectAttributes ? aObjectAttributes->ObjectName->Buffer : L"";
+  uint32_t len =
+    aObjectAttributes ? aObjectAttributes->ObjectName->Length / sizeof(WCHAR) :
+                        0;
+  nsDependentSubstring filename(buf, len);
+  WinIOAutoObservation timer(IOInterposeObserver::OpCreateOrOpen, filename);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtCreateFile);
+
+  // Execute original function
+  return gOriginalNtCreateFile(aFileHandle,
+                               aDesiredAccess,
+                               aObjectAttributes,
+                               aIoStatusBlock,
+                               aAllocationSize,
+                               aFileAttributes,
+                               aShareAccess,
+                               aCreateDisposition,
+                               aCreateOptions,
+                               aEaBuffer,
+                               aEaLength);
+}
+
+static NTSTATUS NTAPI
+InterposedNtReadFile(HANDLE aFileHandle,
+                     HANDLE aEvent,
+                     PIO_APC_ROUTINE aApc,
+                     PVOID aApcCtx,
+                     PIO_STATUS_BLOCK aIoStatus,
+                     PVOID aBuffer,
+                     ULONG aLength,
+                     PLARGE_INTEGER aOffset,
+                     PULONG aKey)
+{
+  // Report IO
+  WinIOAutoObservation timer(IOInterposeObserver::OpRead, aFileHandle, aOffset);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtReadFile);
+
+  // Execute original function
+  return gOriginalNtReadFile(aFileHandle,
+                             aEvent,
+                             aApc,
+                             aApcCtx,
+                             aIoStatus,
+                             aBuffer,
+                             aLength,
+                             aOffset,
+                             aKey);
+}
+
+static NTSTATUS NTAPI
+InterposedNtReadFileScatter(HANDLE aFileHandle,
+                            HANDLE aEvent,
+                            PIO_APC_ROUTINE aApc,
+                            PVOID aApcCtx,
+                            PIO_STATUS_BLOCK aIoStatus,
+                            FILE_SEGMENT_ELEMENT* aSegments,
+                            ULONG aLength,
+                            PLARGE_INTEGER aOffset,
+                            PULONG aKey)
+{
+  // Report IO
+  WinIOAutoObservation timer(IOInterposeObserver::OpRead, aFileHandle, aOffset);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtReadFileScatter);
+
+  // Execute original function
+  return gOriginalNtReadFileScatter(aFileHandle,
+                                    aEvent,
+                                    aApc,
+                                    aApcCtx,
+                                    aIoStatus,
+                                    aSegments,
+                                    aLength,
+                                    aOffset,
+                                    aKey);
+}
+
+// Interposed NtWriteFile function
+static NTSTATUS NTAPI
+InterposedNtWriteFile(HANDLE aFileHandle,
+                      HANDLE aEvent,
+                      PIO_APC_ROUTINE aApc,
+                      PVOID aApcCtx,
+                      PIO_STATUS_BLOCK aIoStatus,
+                      PVOID aBuffer,
+                      ULONG aLength,
+                      PLARGE_INTEGER aOffset,
+                      PULONG aKey)
+{
+  // Report IO
+  WinIOAutoObservation timer(IOInterposeObserver::OpWrite, aFileHandle,
+                             aOffset);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtWriteFile);
+
+  // Execute original function
+  return gOriginalNtWriteFile(aFileHandle,
+                              aEvent,
+                              aApc,
+                              aApcCtx,
+                              aIoStatus,
+                              aBuffer,
+                              aLength,
+                              aOffset,
+                              aKey);
+}
+
+// Interposed NtWriteFileGather function
+static NTSTATUS NTAPI
+InterposedNtWriteFileGather(HANDLE aFileHandle,
+                            HANDLE aEvent,
+                            PIO_APC_ROUTINE aApc,
+                            PVOID aApcCtx,
+                            PIO_STATUS_BLOCK aIoStatus,
+                            FILE_SEGMENT_ELEMENT* aSegments,
+                            ULONG aLength,
+                            PLARGE_INTEGER aOffset,
+                            PULONG aKey)
+{
+  // Report IO
+  WinIOAutoObservation timer(IOInterposeObserver::OpWrite, aFileHandle,
+                             aOffset);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtWriteFileGather);
+
+  // Execute original function
+  return gOriginalNtWriteFileGather(aFileHandle,
+                                    aEvent,
+                                    aApc,
+                                    aApcCtx,
+                                    aIoStatus,
+                                    aSegments,
+                                    aLength,
+                                    aOffset,
+                                    aKey);
+}
+
+static NTSTATUS NTAPI
+InterposedNtFlushBuffersFile(HANDLE aFileHandle,
+                             PIO_STATUS_BLOCK aIoStatusBlock)
+{
+  // Report IO
+  WinIOAutoObservation timer(IOInterposeObserver::OpFSync, aFileHandle,
+                             nullptr);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtFlushBuffersFile);
+
+  // Execute original function
+  return gOriginalNtFlushBuffersFile(aFileHandle,
+                                     aIoStatusBlock);
+}
+
+static NTSTATUS NTAPI
+InterposedNtQueryFullAttributesFile(
+    POBJECT_ATTRIBUTES aObjectAttributes,
+    PFILE_NETWORK_OPEN_INFORMATION aFileInformation)
+{
+  // Report IO
+  const wchar_t* buf =
+    aObjectAttributes ? aObjectAttributes->ObjectName->Buffer : L"";
+  uint32_t len =
+    aObjectAttributes ? aObjectAttributes->ObjectName->Length / sizeof(WCHAR) :
+                        0;
+  nsDependentSubstring filename(buf, len);
+  WinIOAutoObservation timer(IOInterposeObserver::OpStat, filename);
+
+  // Something is badly wrong if this function is undefined
+  MOZ_ASSERT(gOriginalNtQueryFullAttributesFile);
+
+  // Execute original function
+  return gOriginalNtQueryFullAttributesFile(aObjectAttributes,
+                                            aFileInformation);
+}
+
+} // namespace
+
+/******************************** IO Poisoning ********************************/
+
+// Windows DLL interceptor
+static WindowsDllInterceptor sNtDllInterceptor;
+
+namespace mozilla {
+
+void
+InitPoisonIOInterposer()
+{
+  // Don't poison twice... as this function may only be invoked on the main
+  // thread when no other threads are running, it safe to allow multiple calls
+  // to InitPoisonIOInterposer() without complaining (ie. failing assertions).
+  if (sIOPoisoned) {
+    return;
+  }
+  sIOPoisoned = true;
+
+  // Stdout and Stderr are OK.
+  MozillaRegisterDebugFD(1);
+  MozillaRegisterDebugFD(2);
+
+#ifdef MOZ_REPLACE_MALLOC
+  // The contract with InitDebugFd is that the given registry can be used
+  // at any moment, so the instance needs to persist longer than the scope
+  // of this functions.
+  static DebugFdRegistry registry;
+  ReplaceMalloc::InitDebugFd(registry);
+#endif
+
+  // Initialize dll interceptor and add hooks
+  sNtDllInterceptor.Init("ntdll.dll");
+  sNtDllInterceptor.AddHook(
+    "NtCreateFile",
+    reinterpret_cast<intptr_t>(InterposedNtCreateFile),
+    reinterpret_cast<void**>(&gOriginalNtCreateFile));
+  sNtDllInterceptor.AddHook(
+    "NtReadFile",
+    reinterpret_cast<intptr_t>(InterposedNtReadFile),
+    reinterpret_cast<void**>(&gOriginalNtReadFile));
+  sNtDllInterceptor.AddHook(
+    "NtReadFileScatter",
+    reinterpret_cast<intptr_t>(InterposedNtReadFileScatter),
+    reinterpret_cast<void**>(&gOriginalNtReadFileScatter));
+  sNtDllInterceptor.AddHook(
+    "NtWriteFile",
+    reinterpret_cast<intptr_t>(InterposedNtWriteFile),
+    reinterpret_cast<void**>(&gOriginalNtWriteFile));
+  sNtDllInterceptor.AddHook(
+    "NtWriteFileGather",
+    reinterpret_cast<intptr_t>(InterposedNtWriteFileGather),
+    reinterpret_cast<void**>(&gOriginalNtWriteFileGather));
+  sNtDllInterceptor.AddHook(
+    "NtFlushBuffersFile",
+    reinterpret_cast<intptr_t>(InterposedNtFlushBuffersFile),
+    reinterpret_cast<void**>(&gOriginalNtFlushBuffersFile));
+  sNtDllInterceptor.AddHook(
+    "NtQueryFullAttributesFile",
+    reinterpret_cast<intptr_t>(InterposedNtQueryFullAttributesFile),
+    reinterpret_cast<void**>(&gOriginalNtQueryFullAttributesFile));
+}
+
+void
+ClearPoisonIOInterposer()
+{
+  MOZ_ASSERT(false);
+  if (sIOPoisoned) {
+    // Destroy the DLL interceptor
+    sIOPoisoned = false;
+    sNtDllInterceptor = WindowsDllInterceptor();
+  }
+}
+
+} // namespace mozilla
diff --git a/xpcom/build/ServiceList.h b/xpcom/build/ServiceList.h
new file mode 100644
index 0000000000..3bb8308dd8
--- /dev/null
+++ b/xpcom/build/ServiceList.h
@@ -0,0 +1,46 @@
+/* -*- 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/. */
+// IWYU pragma: private, include "mozilla/Services.h"
+
+MOZ_SERVICE(ChromeRegistryService, nsIChromeRegistry,
+            "@mozilla.org/chrome/chrome-registry;1")
+MOZ_SERVICE(ToolkitChromeRegistryService, nsIToolkitChromeRegistry,
+            "@mozilla.org/chrome/chrome-registry;1")
+MOZ_SERVICE(XULChromeRegistryService, nsIXULChromeRegistry,
+            "@mozilla.org/chrome/chrome-registry;1")
+MOZ_SERVICE(XULOverlayProviderService, nsIXULOverlayProvider,
+            "@mozilla.org/chrome/chrome-registry;1")
+MOZ_SERVICE(IOService, nsIIOService,
+            "@mozilla.org/network/io-service;1")
+MOZ_SERVICE(ObserverService, nsIObserverService,
+            "@mozilla.org/observer-service;1")
+MOZ_SERVICE(StringBundleService, nsIStringBundleService,
+            "@mozilla.org/intl/stringbundle;1")
+MOZ_SERVICE(XPConnect, nsIXPConnect,
+            "@mozilla.org/js/xpc/XPConnect;1")
+MOZ_SERVICE(InDOMUtils, inIDOMUtils,
+            "@mozilla.org/inspector/dom-utils;1")
+MOZ_SERVICE(PermissionManager, nsIPermissionManager,
+            "@mozilla.org/permissionmanager;1");
+MOZ_SERVICE(ServiceWorkerManager, nsIServiceWorkerManager,
+            "@mozilla.org/serviceworkers/manager;1");
+MOZ_SERVICE(AsyncShutdown, nsIAsyncShutdownService,
+            "@mozilla.org/async-shutdown-service;1")
+MOZ_SERVICE(UUIDGenerator, nsIUUIDGenerator,
+            "@mozilla.org/uuid-generator;1");
+MOZ_SERVICE(GfxInfo, nsIGfxInfo,
+            "@mozilla.org/gfx/info;1");
+
+#ifdef MOZ_USE_NAMESPACE
+namespace mozilla {
+#endif
+
+MOZ_SERVICE(HistoryService, IHistory,
+            "@mozilla.org/browser/history;1")
+
+#ifdef MOZ_USE_NAMESPACE
+} // namespace mozilla
+#endif
diff --git a/xpcom/build/Services.cpp b/xpcom/build/Services.cpp
new file mode 100644
index 0000000000..6c521391e6
--- /dev/null
+++ b/xpcom/build/Services.cpp
@@ -0,0 +1,71 @@
+/* -*- 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 "mozilla/Likely.h"
+#include "mozilla/Services.h"
+#include "nsComponentManager.h"
+#include "nsIObserverService.h"
+#include "nsNetCID.h"
+#include "nsObserverService.h"
+#include "nsXPCOMPrivate.h"
+#include "nsIIOService.h"
+#include "nsIDirectoryService.h"
+#include "nsIChromeRegistry.h"
+#include "nsIStringBundle.h"
+#include "nsIToolkitChromeRegistry.h"
+#include "nsIXULOverlayProvider.h"
+#include "IHistory.h"
+#include "nsIXPConnect.h"
+#include "inIDOMUtils.h"
+#include "nsIPermissionManager.h"
+#include "nsIServiceWorkerManager.h"
+#include "nsIAsyncShutdown.h"
+#include "nsIUUIDGenerator.h"
+#include "nsIGfxInfo.h"
+
+using namespace mozilla;
+using namespace mozilla::services;
+
+/*
+ * Define a global variable and a getter for every service in ServiceList.
+ * eg. gIOService and GetIOService()
+ */
+#define MOZ_SERVICE(NAME, TYPE, CONTRACT_ID)                            \
+  static TYPE* g##NAME = nullptr;                                       \
+                                                                        \
+  already_AddRefed<TYPE>                                                \
+  mozilla::services::Get##NAME()                                        \
+  {                                                                     \
+    if (MOZ_UNLIKELY(gXPCOMShuttingDown)) {                             \
+      return nullptr;                                                   \
+    }                                                                   \
+    if (!g##NAME) {                                                     \
+      nsCOMPtr<TYPE> os = do_GetService(CONTRACT_ID);                   \
+      os.swap(g##NAME);                                                 \
+    }                                                                   \
+    nsCOMPtr<TYPE> ret = g##NAME;                                       \
+    return ret.forget();                                                \
+  }                                                                     \
+  NS_EXPORT_(already_AddRefed<TYPE>)                                    \
+  mozilla::services::_external_Get##NAME()                              \
+  {                                                                     \
+    return Get##NAME();                                                 \
+  }
+
+#include "ServiceList.h"
+#undef MOZ_SERVICE
+
+/**
+ * Clears service cache, sets gXPCOMShuttingDown
+ */
+void
+mozilla::services::Shutdown()
+{
+  gXPCOMShuttingDown = true;
+#define MOZ_SERVICE(NAME, TYPE, CONTRACT_ID) NS_IF_RELEASE(g##NAME);
+#include "ServiceList.h"
+#undef MOZ_SERVICE
+}
diff --git a/xpcom/build/Services.h b/xpcom/build/Services.h
new file mode 100644
index 0000000000..84a3553993
--- /dev/null
+++ b/xpcom/build/Services.h
@@ -0,0 +1,45 @@
+/* -*- 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/. */
+
+#ifndef mozilla_Services_h
+#define mozilla_Services_h
+
+#include "nscore.h"
+#include "nsCOMPtr.h"
+
+#define MOZ_USE_NAMESPACE
+#define MOZ_SERVICE(NAME, TYPE, SERVICE_CID) class TYPE;
+
+#include "ServiceList.h"
+#undef MOZ_SERVICE
+#undef MOZ_USE_NAMESPACE
+
+namespace mozilla {
+namespace services {
+
+#ifdef MOZILLA_INTERNAL_API
+#define MOZ_SERVICE(NAME, TYPE, SERVICE_CID)                        \
+    already_AddRefed<TYPE> Get##NAME();                             \
+    NS_EXPORT_(already_AddRefed<TYPE>) _external_Get##NAME();
+
+#include "ServiceList.h"
+#undef MOZ_SERVICE
+#else
+#define MOZ_SERVICE(NAME, TYPE, SERVICE_CID)                        \
+    NS_IMPORT_(already_AddRefed<TYPE>) _external_Get##NAME();       \
+    inline already_AddRefed<TYPE> Get##NAME()                       \
+    {                                                               \
+        return _external_Get##NAME();                               \
+    }
+
+#include "ServiceList.h"
+#undef MOZ_SERVICE
+#endif
+
+} // namespace services
+} // namespace mozilla
+
+#endif
diff --git a/xpcom/build/XPCOM.h b/xpcom/build/XPCOM.h
new file mode 100644
index 0000000000..f52a87c695
--- /dev/null
+++ b/xpcom/build/XPCOM.h
@@ -0,0 +1,178 @@
+/* -*- 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/. */
+
+#ifndef mozilla_XPCOM_h
+#define mozilla_XPCOM_h
+
+// NOTE: the following headers are sorted topologically, not alphabetically.
+// Do not reorder them without review from bsmedberg.
+
+// system headers required by XPCOM headers
+
+#include <string.h>
+
+// core headers required by pretty much everything else
+
+#include "nscore.h"
+
+#include "nsXPCOMCID.h"
+#include "nsXPCOM.h"
+
+#include "nsError.h"
+#include "nsDebug.h"
+#include "nsMemory.h"
+
+#include "nsID.h"
+
+#include "nsISupports.h"
+
+#include "nsTArray.h"
+#include "nsTWeakRef.h"
+
+#include "nsCOMPtr.h"
+#include "nsCOMArray.h"
+
+#ifndef MOZILLA_INTERNAL_API
+#include "nsStringAPI.h"
+#else
+#include "nsString.h"
+#include "nsReadableUtils.h"
+#include "nsNativeCharsetUtils.h"
+#endif
+
+#include "nsISupportsUtils.h"
+#include "nsISupportsImpl.h"
+
+// core data structures
+
+#include "nsTHashtable.h"
+#include "nsHashKeys.h"
+#include "nsBaseHashtable.h"
+#include "nsDataHashtable.h"
+#include "nsInterfaceHashtable.h"
+#include "nsClassHashtable.h"
+#include "nsRefPtrHashtable.h"
+
+// interfaces that inherit directly from nsISupports
+
+#include "nsIArray.h"
+#include "nsIAtom.h"
+#include "nsIAtomService.h"
+#include "nsICategoryManager.h"
+#include "nsIClassInfo.h"
+#include "nsIComponentManager.h"
+#include "nsIConsoleListener.h"
+#include "nsIConsoleMessage.h"
+#include "nsIConsoleService.h"
+#include "nsIDebug2.h"
+#include "nsIDirectoryEnumerator.h"
+#include "nsIEnvironment.h"
+#include "nsIErrorService.h"
+#include "nsIEventTarget.h"
+#include "nsIException.h"
+#include "nsIFactory.h"
+#include "nsIFile.h"
+#include "nsIHashable.h"
+#include "nsIINIParser.h"
+#include "nsIInputStream.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsILineInputStream.h"
+#include "nsIMemory.h"
+#include "nsIMutable.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsIOutputStream.h"
+#include "nsIProcess.h"
+#include "nsIProperties.h"
+#include "nsIPropertyBag2.h"
+#include "nsIRunnable.h"
+#include "nsISeekableStream.h"
+#include "nsISerializable.h"
+#include "nsIServiceManager.h"
+#include "nsIScriptableInputStream.h"
+#include "nsISimpleEnumerator.h"
+#include "nsIStreamBufferAccess.h"
+#include "nsIStringEnumerator.h"
+#include "nsIStorageStream.h"
+#include "nsISupportsIterators.h"
+#include "nsISupportsPrimitives.h"
+#include "nsISupportsPriority.h"
+#include "nsIThreadManager.h"
+#include "nsITimer.h"
+#include "nsIUUIDGenerator.h"
+#include "nsIUnicharInputStream.h"
+#include "nsIUnicharOutputStream.h"
+#include "nsIUnicharLineInputStream.h"
+#include "nsIVariant.h"
+#include "nsIVersionComparator.h"
+#include "nsIWritablePropertyBag2.h"
+
+// interfaces that include something above
+
+#include "nsIAsyncInputStream.h"
+#include "nsIAsyncOutputStream.h"
+#include "nsIBinaryInputStream.h"
+#include "nsIBinaryOutputStream.h"
+#include "nsIConverterInputStream.h"
+#include "nsIConverterOutputStream.h"
+#include "nsIInputStreamTee.h"
+#include "nsIMultiplexInputStream.h"
+#include "nsIMutableArray.h"
+#include "nsIPersistentProperties2.h"
+#include "nsIStringStream.h"
+#include "nsIThread.h"
+#include "nsIThreadPool.h"
+
+// interfaces that include something above
+
+#include "nsILocalFileWin.h"
+#include "nsIObjectInputStream.h"
+#include "nsIObjectOutputStream.h"
+#include "nsIPipe.h"
+
+#ifdef MOZ_WIDGET_COCOA
+#include "nsILocalFileMac.h"
+#include "nsIMacUtils.h"
+#endif
+
+// xpcom/glue utility headers
+
+#include "nsComponentManagerUtils.h"
+#include "nsServiceManagerUtils.h"
+
+#include "nsIWeakReferenceUtils.h"
+#include "nsWeakReference.h"
+
+#include "nsArrayEnumerator.h"
+#include "nsArrayUtils.h"
+#include "nsCRTGlue.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsDeque.h"
+#include "nsEnumeratorUtils.h"
+#include "nsIClassInfoImpl.h"
+#include "mozilla/ModuleUtils.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsINIParser.h"
+#include "nsProxyRelease.h"
+#include "nsTObserverArray.h"
+#include "nsTextFormatter.h"
+#include "nsThreadUtils.h"
+#include "nsVersionComparator.h"
+#include "nsXPTCUtils.h"
+
+// xpcom/base utility headers
+
+#include "nsAgg.h"
+#include "nsAutoRef.h"
+#include "nsInterfaceRequestorAgg.h"
+
+// xpcom/io utility headers
+
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+
+#endif // mozilla_XPCOM_h
diff --git a/xpcom/build/XPCOMInit.cpp b/xpcom/build/XPCOMInit.cpp
new file mode 100644
index 0000000000..c72ea48d77
--- /dev/null
+++ b/xpcom/build/XPCOMInit.cpp
@@ -0,0 +1,1126 @@
+/* -*- 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 "base/basictypes.h"
+
+#include "mozilla/AbstractThread.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Poison.h"
+#include "mozilla/SharedThreadPool.h"
+#include "mozilla/XPCOM.h"
+#include "nsXULAppAPI.h"
+
+#include "nsXPCOMPrivate.h"
+#include "nsXPCOMCIDInternal.h"
+
+#include "mozilla/layers/ImageBridgeChild.h"
+#include "mozilla/layers/CompositorBridgeParent.h"
+#include "mozilla/dom/VideoDecoderManagerChild.h"
+
+#include "prlink.h"
+
+#include "nsCycleCollector.h"
+#include "nsObserverList.h"
+#include "nsObserverService.h"
+#include "nsProperties.h"
+#include "nsPersistentProperties.h"
+#include "nsScriptableInputStream.h"
+#include "nsBinaryStream.h"
+#include "nsStorageStream.h"
+#include "nsPipe.h"
+#include "nsScriptableBase64Encoder.h"
+
+#include "nsMemoryImpl.h"
+#include "nsDebugImpl.h"
+#include "nsTraceRefcnt.h"
+#include "nsErrorService.h"
+
+// Disable deprecation warnings generated by nsISupportsArray and associated
+// classes.
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#elif defined(_MSC_VER)
+#pragma warning (push)
+#pragma warning (disable : 4996)
+#endif
+
+#include "nsSupportsArray.h"
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#elif defined(_MSC_VER)
+#pragma warning (pop)
+#endif
+
+#include "nsArray.h"
+#include "nsINIParserImpl.h"
+#include "nsSupportsPrimitives.h"
+#include "nsConsoleService.h"
+
+#include "nsComponentManager.h"
+#include "nsCategoryManagerUtils.h"
+#include "nsIServiceManager.h"
+
+#include "nsThreadManager.h"
+#include "nsThreadPool.h"
+
+#include "xptinfo.h"
+#include "nsIInterfaceInfoManager.h"
+#include "xptiprivate.h"
+#include "mozilla/XPTInterfaceInfoManager.h"
+
+#include "nsTimerImpl.h"
+#include "TimerThread.h"
+
+#include "nsThread.h"
+#include "nsProcess.h"
+#include "nsEnvironment.h"
+#include "nsVersionComparatorImpl.h"
+
+#include "nsIFile.h"
+#include "nsLocalFile.h"
+#if defined(XP_UNIX)
+#include "nsNativeCharsetUtils.h"
+#endif
+#include "nsDirectoryService.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsCategoryManager.h"
+#include "nsICategoryManager.h"
+#include "nsMultiplexInputStream.h"
+
+#include "nsStringStream.h"
+extern nsresult nsStringInputStreamConstructor(nsISupports*, REFNSIID, void**);
+
+#include "nsAtomService.h"
+#include "nsAtomTable.h"
+#include "nsISupportsImpl.h"
+
+#include "nsHashPropertyBag.h"
+
+#include "nsUnicharInputStream.h"
+#include "nsVariant.h"
+
+#include "nsUUIDGenerator.h"
+
+#include "nsIOUtil.h"
+
+#include "SpecialSystemDirectory.h"
+
+#if defined(XP_WIN)
+#include "mozilla/WindowsVersion.h"
+#include "nsWindowsRegKey.h"
+#endif
+
+#ifdef MOZ_WIDGET_COCOA
+#include "nsMacUtilsImpl.h"
+#endif
+
+#include "nsSystemInfo.h"
+#include "nsMemoryReporterManager.h"
+#include "nsMemoryInfoDumper.h"
+#include "nsSecurityConsoleMessage.h"
+#include "nsMessageLoop.h"
+
+#include "nsStatusReporterManager.h"
+
+#include <locale.h>
+#include "mozilla/Services.h"
+#include "mozilla/Omnijar.h"
+#include "mozilla/HangMonitor.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/BackgroundHangMonitor.h"
+
+#include "nsChromeRegistry.h"
+#include "nsChromeProtocolHandler.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/SystemMemoryReporter.h"
+#include "mozilla/UniquePtr.h"
+
+#include "mozilla/ipc/GeckoChildProcessHost.h"
+
+#include "ogg/ogg.h"
+#if defined(MOZ_VPX) && !defined(MOZ_VPX_NO_MEM_REPORTING)
+#if defined(HAVE_STDINT_H)
+// mozilla-config.h defines HAVE_STDINT_H, and then it's defined *again* in
+// vpx_config.h (which we include via vpx_mem.h, below). This redefinition
+// triggers a build warning on MSVC, so we have to #undef it first.
+#undef HAVE_STDINT_H
+#endif
+#include "vpx_mem/vpx_mem.h"
+#endif
+
+#include "GeckoProfiler.h"
+
+#include "jsapi.h"
+#include "js/Initialization.h"
+
+#include "gfxPlatform.h"
+
+#if EXPOSE_INTL_API
+#include "unicode/putil.h"
+#endif
+
+using namespace mozilla;
+using base::AtExitManager;
+using mozilla::ipc::BrowserProcessSubThread;
+
+namespace {
+
+static AtExitManager* sExitManager;
+static MessageLoop* sMessageLoop;
+static bool sCommandLineWasInitialized;
+static BrowserProcessSubThread* sIOThread;
+static 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
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsProcess)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsID)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsString)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsCString)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRBool)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRUint8)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRUint16)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRUint32)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRUint64)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRTime)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsChar)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRInt16)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRInt32)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsPRInt64)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsFloat)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsDouble)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsVoid)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSupportsInterfacePointer)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsConsoleService, Init)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsAtomService)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsTimer)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsBinaryOutputStream)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsBinaryInputStream)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsStorageStream)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsVersionComparatorImpl)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsScriptableBase64Encoder)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsVariantCC)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsHashPropertyBagCC)
+
+NS_GENERIC_AGGREGATED_CONSTRUCTOR(nsProperties)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsUUIDGenerator, Init)
+
+#ifdef MOZ_WIDGET_COCOA
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsMacUtilsImpl)
+#endif
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsSystemInfo, Init)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsMemoryReporterManager, Init)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsMemoryInfoDumper)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsStatusReporterManager, Init)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsIOUtil)
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsSecurityConsoleMessage)
+
+static nsresult
+nsThreadManagerGetSingleton(nsISupports* aOuter,
+                            const nsIID& aIID,
+                            void** aInstancePtr)
+{
+  NS_ASSERTION(aInstancePtr, "null outptr");
+  if (NS_WARN_IF(aOuter)) {
+    return NS_ERROR_NO_AGGREGATION;
+  }
+
+  return nsThreadManager::get().QueryInterface(aIID, aInstancePtr);
+}
+
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsThreadPool)
+
+static nsresult
+nsXPTIInterfaceInfoManagerGetSingleton(nsISupports* aOuter,
+                                       const nsIID& aIID,
+                                       void** aInstancePtr)
+{
+  NS_ASSERTION(aInstancePtr, "null outptr");
+  if (NS_WARN_IF(aOuter)) {
+    return NS_ERROR_NO_AGGREGATION;
+  }
+
+  nsCOMPtr<nsIInterfaceInfoManager> iim(XPTInterfaceInfoManager::GetSingleton());
+  if (!iim) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return iim->QueryInterface(aIID, aInstancePtr);
+}
+
+nsComponentManagerImpl* nsComponentManagerImpl::gComponentManager = nullptr;
+bool gXPCOMShuttingDown = false;
+bool gXPCOMThreadsShutDown = false;
+char16_t* gGREBinPath = nullptr;
+
+static NS_DEFINE_CID(kComponentManagerCID, NS_COMPONENTMANAGER_CID);
+static NS_DEFINE_CID(kINIParserFactoryCID, NS_INIPARSERFACTORY_CID);
+
+NS_DEFINE_NAMED_CID(NS_CHROMEREGISTRY_CID);
+NS_DEFINE_NAMED_CID(NS_CHROMEPROTOCOLHANDLER_CID);
+
+NS_DEFINE_NAMED_CID(NS_SECURITY_CONSOLE_MESSAGE_CID);
+
+NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(nsChromeRegistry,
+                                         nsChromeRegistry::GetSingleton)
+NS_GENERIC_FACTORY_CONSTRUCTOR(nsChromeProtocolHandler)
+
+#define NS_PERSISTENTPROPERTIES_CID NS_IPERSISTENTPROPERTIES_CID /* sigh */
+
+static already_AddRefed<nsIFactory>
+CreateINIParserFactory(const mozilla::Module& aModule,
+                       const mozilla::Module::CIDEntry& aEntry)
+{
+  nsCOMPtr<nsIFactory> f = new nsINIParserFactory();
+  return f.forget();
+}
+
+#define COMPONENT(NAME, Ctor) static NS_DEFINE_CID(kNS_##NAME##_CID, NS_##NAME##_CID);
+#define COMPONENT_M(NAME, Ctor, Selector) static NS_DEFINE_CID(kNS_##NAME##_CID, NS_##NAME##_CID);
+#include "XPCOMModule.inc"
+#undef COMPONENT
+#undef COMPONENT_M
+
+#define COMPONENT(NAME, Ctor) { &kNS_##NAME##_CID, false, nullptr, Ctor },
+#define COMPONENT_M(NAME, Ctor, Selector) { &kNS_##NAME##_CID, false, nullptr, Ctor, Selector },
+const mozilla::Module::CIDEntry kXPCOMCIDEntries[] = {
+  { &kComponentManagerCID, true, nullptr, nsComponentManagerImpl::Create, Module::ALLOW_IN_GPU_PROCESS },
+  { &kINIParserFactoryCID, false, CreateINIParserFactory },
+#include "XPCOMModule.inc"
+  { &kNS_CHROMEREGISTRY_CID, false, nullptr, nsChromeRegistryConstructor },
+  { &kNS_CHROMEPROTOCOLHANDLER_CID, false, nullptr, nsChromeProtocolHandlerConstructor },
+  { &kNS_SECURITY_CONSOLE_MESSAGE_CID, false, nullptr, nsSecurityConsoleMessageConstructor },
+  { nullptr }
+};
+#undef COMPONENT
+#undef COMPONENT_M
+
+#define COMPONENT(NAME, Ctor) { NS_##NAME##_CONTRACTID, &kNS_##NAME##_CID },
+#define COMPONENT_M(NAME, Ctor, Selector) { NS_##NAME##_CONTRACTID, &kNS_##NAME##_CID, Selector },
+const mozilla::Module::ContractIDEntry kXPCOMContracts[] = {
+#include "XPCOMModule.inc"
+  { NS_CHROMEREGISTRY_CONTRACTID, &kNS_CHROMEREGISTRY_CID },
+  { NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "chrome", &kNS_CHROMEPROTOCOLHANDLER_CID },
+  { NS_INIPARSERFACTORY_CONTRACTID, &kINIParserFactoryCID },
+  { NS_SECURITY_CONSOLE_MESSAGE_CONTRACTID, &kNS_SECURITY_CONSOLE_MESSAGE_CID },
+  { nullptr }
+};
+#undef COMPONENT
+#undef COMPONENT_M
+
+const mozilla::Module kXPCOMModule = {
+  mozilla::Module::kVersion, kXPCOMCIDEntries, kXPCOMContracts,
+  nullptr,
+  nullptr,
+  nullptr,
+  nullptr,
+  Module::ALLOW_IN_GPU_PROCESS
+};
+
+// gDebug will be freed during shutdown.
+static nsIDebug2* gDebug = nullptr;
+
+EXPORT_XPCOM_API(nsresult)
+NS_GetDebug(nsIDebug2** aResult)
+{
+  return nsDebugImpl::Create(nullptr,  NS_GET_IID(nsIDebug2), (void**)aResult);
+}
+
+EXPORT_XPCOM_API(nsresult)
+NS_InitXPCOM(nsIServiceManager** aResult,
+             nsIFile* aBinDirectory)
+{
+  return NS_InitXPCOM2(aResult, aBinDirectory, nullptr);
+}
+
+class ICUReporter final
+  : public nsIMemoryReporter
+  , public 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() {}
+};
+
+NS_IMPL_ISUPPORTS(ICUReporter, nsIMemoryReporter)
+
+/* static */ template<> Atomic<size_t>
+CountingAllocatorBase<ICUReporter>::sAmount(0);
+
+class OggReporter final
+  : public nsIMemoryReporter
+  , public 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() {}
+};
+
+NS_IMPL_ISUPPORTS(OggReporter, nsIMemoryReporter)
+
+/* static */ template<> Atomic<size_t>
+CountingAllocatorBase<OggReporter>::sAmount(0);
+
+#ifdef MOZ_VPX
+class VPXReporter final
+  : public nsIMemoryReporter
+  , public CountingAllocatorBase<VPXReporter>
+{
+public:
+  NS_DECL_ISUPPORTS
+
+private:
+  NS_IMETHOD
+  CollectReports(nsIHandleReportCallback* aHandleReport, nsISupports* aData,
+                 bool aAnonymize) override
+  {
+    MOZ_COLLECT_REPORT(
+      "explicit/media/libvpx", KIND_HEAP, UNITS_BYTES, MemoryAllocated(),
+      "Memory allocated through libvpx for WebM media files.");
+
+    return NS_OK;
+  }
+
+  ~VPXReporter() {}
+};
+
+NS_IMPL_ISUPPORTS(VPXReporter, nsIMemoryReporter)
+
+/* static */ template<> Atomic<size_t>
+CountingAllocatorBase<VPXReporter>::sAmount(0);
+#endif /* MOZ_VPX */
+
+static double
+TimeSinceProcessCreation()
+{
+  bool ignore;
+  return (TimeStamp::Now() - TimeStamp::ProcessCreation(ignore)).ToMilliseconds();
+}
+
+static bool sInitializedJS = false;
+
+// Note that on OSX, aBinDirectory will point to .app/Contents/Resources/browser
+EXPORT_XPCOM_API(nsresult)
+NS_InitXPCOM2(nsIServiceManager** aResult,
+              nsIFile* aBinDirectory,
+              nsIDirectoryServiceProvider* aAppFileLocationProvider)
+{
+  static bool sInitialized = false;
+  if (sInitialized) {
+    return NS_ERROR_FAILURE;
+  }
+
+  sInitialized = true;
+
+  mozPoisonValueInit();
+
+  NS_LogInit();
+
+  NS_InitAtomTable();
+
+  mozilla::LogModule::Init();
+
+  JS_SetCurrentEmbedderTimeFunction(TimeSinceProcessCreation);
+
+  char aLocal;
+  profiler_init(&aLocal);
+  nsresult rv = NS_OK;
+
+  // We are not shutting down
+  gXPCOMShuttingDown = false;
+
+  // Initialize the available memory tracker before other threads have had a
+  // chance to start up, because the initialization is not thread-safe.
+  mozilla::AvailableMemoryTracker::Init();
+
+#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)) {
+    UniquePtr<BrowserProcessSubThread> ioThread = 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;
+  }
+
+  // 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
+
+#if defined(XP_UNIX)
+  NS_StartupNativeCharsetUtils();
+#endif
+
+  NS_StartupLocalFile();
+
+  StartupSpecialSystemDirectory();
+
+  nsDirectoryService::RealInit();
+
+  bool value;
+
+  if (aBinDirectory) {
+    rv = aBinDirectory->IsDirectory(&value);
+
+    if (NS_SUCCEEDED(rv) && value) {
+      nsDirectoryService::gService->Set(NS_XPCOM_INIT_CURRENT_PROCESS_DIR,
+                                        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(NS_LITERAL_CSTRING("nonexistent-executable"));
+    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);
+
+#if defined(MOZ_VPX) && !defined(MOZ_VPX_NO_MEM_REPORTING)
+  // And for VPX.
+  vpx_mem_set_functions(VPXReporter::CountingMalloc,
+                        VPXReporter::CountingCalloc,
+                        VPXReporter::CountingRealloc,
+                        VPXReporter::CountingFree,
+                        memcpy,
+                        memset,
+                        memmove);
+#endif
+
+#if EXPOSE_INTL_API && defined(MOZ_ICU_DATA_ARCHIVE)
+  nsCOMPtr<nsIFile> greDir;
+  nsDirectoryService::gService->Get(NS_GRE_DIR,
+                                    NS_GET_IID(nsIFile),
+                                    getter_AddRefs(greDir));
+  MOZ_ASSERT(greDir);
+  nsAutoCString nativeGREPath;
+  greDir->GetNativePath(nativeGREPath);
+  u_setDataDirectory(nativeGREPath.get());
+#endif
+
+  // Initialize the JS engine.
+  const char* jsInitFailureReason = JS_InitWithFailureDiagnostic();
+  if (jsInitFailureReason) {
+    NS_RUNTIMEABORT(jsInitFailureReason);
+  }
+  sInitializedJS = true;
+  
+  // Init AbstractThread.
+  AbstractThread::InitStatics();
+
+  rv = nsComponentManagerImpl::gComponentManager->Init();
+  if (NS_FAILED(rv)) {
+    NS_RELEASE(nsComponentManagerImpl::gComponentManager);
+    return rv;
+  }
+
+  if (aResult) {
+    NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
+  }
+
+  // The iimanager constructor searches and registers XPT files.
+  // (We trigger the singleton's lazy construction here to make that happen.)
+  (void)XPTInterfaceInfoManager::GetSingleton();
+
+  // 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 SharedThreadPool (which needs the service manager).
+  SharedThreadPool::InitStatics();
+
+  // Force layout to spin up so that nsContentUtils is available for cx stack
+  // munging.  Note that layout registers a number of static atoms, and also
+  // seals the static atom table, so NS_RegisterStaticAtom may not be called
+  // beyond this point.
+  nsCOMPtr<nsISupports> componentLoader =
+    do_GetService("@mozilla.org/moz/jsloader;1");
+
+  mozilla::scache::StartupCache::GetSingleton();
+  mozilla::AvailableMemoryTracker::Activate();
+
+  // Notify observers of xpcom autoregistration start
+  NS_CreateServicesFromCategory(NS_XPCOM_STARTUP_CATEGORY,
+                                nullptr,
+                                NS_XPCOM_STARTUP_OBSERVER_ID);
+#ifdef XP_WIN
+  CreateAnonTempFileRemover();
+#endif
+
+  // We only want the SystemMemoryReporter running in one process, because it
+  // profiles the entire system.  The main process is the obvious place for
+  // it.
+  if (XRE_IsParentProcess()) {
+    mozilla::SystemMemoryReporter::Init();
+  }
+
+  // The memory reporter manager is up and running -- register our reporters.
+  RegisterStrongMemoryReporter(new ICUReporter());
+  RegisterStrongMemoryReporter(new OggReporter());
+#ifdef MOZ_VPX
+  RegisterStrongMemoryReporter(new VPXReporter());
+#endif
+
+  mozilla::Telemetry::Init();
+
+  mozilla::HangMonitor::Startup();
+  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());
+
+  return NS_OK;
+}
+
+EXPORT_XPCOM_API(nsresult)
+NS_InitMinimalXPCOM()
+{
+  mozPoisonValueInit();
+  NS_SetMainThread();
+  mozilla::TimeStamp::Startup();
+  NS_LogInit();
+  NS_InitAtomTable();
+  mozilla::LogModule::Init();
+
+  char aLocal;
+  profiler_init(&aLocal);
+
+  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;
+  }
+
+  AbstractThread::InitStatics();
+  SharedThreadPool::InitStatics();
+  mozilla::Telemetry::Init();
+  mozilla::HangMonitor::Startup();
+  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)) {
+      NS_RUNTIMEABORT("JS_SetICUMemoryFunctions failed.");
+    }
+    sICUReporterInitialized = true;
+  }
+}
+
+nsresult
+ShutdownXPCOM(nsIServiceManager* aServMgr)
+{
+  // Make sure the hang monitor is enabled for shutdown.
+  HangMonitor::NotifyActivity();
+
+  if (!NS_IsMainThread()) {
+    NS_RUNTIMEABORT("Shutdown on wrong thread");
+  }
+
+  nsresult rv;
+  nsCOMPtr<nsISimpleEnumerator> moduleLoaders;
+
+  // 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;
+    }
+
+    RefPtr<nsObserverService> observerService;
+    CallGetService("@mozilla.org/observer-service;1",
+                   (nsObserverService**)getter_AddRefs(observerService));
+
+    if (observerService) {
+      mozilla::KillClearOnShutdown(ShutdownPhase::WillShutdown);
+      observerService->NotifyObservers(nullptr,
+                                       NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID,
+                                       nullptr);
+
+      nsCOMPtr<nsIServiceManager> mgr;
+      rv = NS_GetServiceManager(getter_AddRefs(mgr));
+      if (NS_SUCCEEDED(rv)) {
+        mozilla::KillClearOnShutdown(ShutdownPhase::Shutdown);
+        observerService->NotifyObservers(mgr, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
+                                         nullptr);
+      }
+    }
+
+    // This must happen after the shutdown of media and widgets, which
+    // are triggered by the NS_XPCOM_SHUTDOWN_OBSERVER_ID notification.
+    NS_ProcessPendingEvents(thread);
+    gfxPlatform::ShutdownLayersIPC();
+    mozilla::dom::VideoDecoderManagerChild::Shutdown();
+
+    mozilla::scache::StartupCache::DeleteSingleton();
+    if (observerService)
+    {
+      mozilla::KillClearOnShutdown(ShutdownPhase::ShutdownThreads);
+      observerService->NotifyObservers(nullptr,
+                                       NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID,
+                                       nullptr);
+    }
+
+    gXPCOMThreadsShutDown = true;
+    NS_ProcessPendingEvents(thread);
+
+    // Shutdown the timer thread and all timers that might still be alive before
+    // shutting down the component manager
+    nsTimerImpl::Shutdown();
+
+    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().Shutdown();
+
+    NS_ProcessPendingEvents(thread);
+
+    HangMonitor::NotifyActivity();
+
+    // Late-write checks needs to find the profile directory, so it has to
+    // be initialized before mozilla::services::Shutdown or (because of
+    // xpcshell tests replacing the service) modules being unloaded.
+    mozilla::InitLateWriteChecks();
+
+    // We save the "xpcom-shutdown-loaders" observers to notify after
+    // the observerservice is gone.
+    if (observerService) {
+      mozilla::KillClearOnShutdown(ShutdownPhase::ShutdownLoaders);
+      observerService->EnumerateObservers(NS_XPCOM_SHUTDOWN_LOADERS_OBSERVER_ID,
+                                          getter_AddRefs(moduleLoaders));
+
+      observerService->Shutdown();
+    }
+  }
+
+  // Free ClearOnShutdown()'ed smart pointers.  This needs to happen *after*
+  // we've finished notifying observers of XPCOM shutdown, because shutdown
+  // observers themselves might call ClearOnShutdown().
+  mozilla::KillClearOnShutdown(ShutdownPhase::ShutdownFinal);
+
+  // 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();
+  }
+
+  // Release the directory service
+  nsDirectoryService::gService = nullptr;
+
+  free(gGREBinPath);
+  gGREBinPath = nullptr;
+
+  if (moduleLoaders) {
+    bool more;
+    nsCOMPtr<nsISupports> el;
+    while (NS_SUCCEEDED(moduleLoaders->HasMoreElements(&more)) && more) {
+      moduleLoaders->GetNext(getter_AddRefs(el));
+
+      // Don't worry about weak-reference observers here: there is
+      // no reason for weak-ref observers to register for
+      // xpcom-shutdown-loaders
+
+      // 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.
+      nsCOMPtr<nsIObserver> obs(do_QueryInterface(el));
+      if (obs) {
+        obs->Observe(nullptr, NS_XPCOM_SHUTDOWN_LOADERS_OBSERVER_ID, nullptr);
+      }
+    }
+
+    moduleLoaders = nullptr;
+  }
+
+  bool shutdownCollect;
+#ifdef NS_FREE_PERMANENT_DATA
+  shutdownCollect = true;
+#else
+  shutdownCollect = !!PR_GetEnv("MOZ_CC_RUN_DURING_SHUTDOWN");
+#endif
+  nsCycleCollector_shutdown(shutdownCollect);
+
+  PROFILER_MARKER("Shutdown xpcom");
+  // If we are doing any shutdown checks, poison writes.
+  if (gShutdownChecks != SCM_NOTHING) {
+#ifdef XP_MACOSX
+    mozilla::OnlyReportDirtyWrites();
+#endif /* XP_MACOSX */
+    mozilla::BeginLateWriteChecks();
+  }
+
+  // Shutdown nsLocalFile string conversion
+  NS_ShutdownLocalFile();
+#ifdef XP_UNIX
+  NS_ShutdownNativeCharsetUtils();
+#endif
+
+  // Shutdown xpcom. This will release all loaders and cause others holding
+  // a refcount to the component manager to release it.
+  if (nsComponentManagerImpl::gComponentManager) {
+    rv = (nsComponentManagerImpl::gComponentManager)->Shutdown();
+    NS_ASSERTION(NS_SUCCEEDED(rv), "Component Manager shutdown failed.");
+  } else {
+    NS_WARNING("Component Manager was never created ...");
+  }
+
+#ifdef MOZ_ENABLE_PROFILER_SPS
+  // In optimized builds we don't do shutdown collections by default, so
+  // uncollected (garbage) objects may keep the nsXPConnect singleton alive,
+  // and its XPCJSContext along with it. However, we still destroy various
+  // bits of state in JS_ShutDown(), so we need to make sure the profiler
+  // can't access them when it shuts down. This call nulls out the
+  // JS pseudo-stack's internal reference to the main thread JSContext,
+  // duplicating the call in XPCJSContext::~XPCJSContext() in case that
+  // never fired.
+  if (PseudoStack* stack = mozilla_get_pseudo_stack()) {
+    stack->sampleContext(nullptr);
+  }
+#endif
+
+  if (sInitializedJS) {
+    // Shut down the JS engine.
+    JS_ShutDown();
+    sInitializedJS = false;
+  }
+
+  // Release our own singletons
+  // Do this _after_ shutting down the component manager, because the
+  // JS component loader will use XPConnect to call nsIModule::canUnload,
+  // and that will spin up the InterfaceInfoManager again -- bad mojo
+  XPTInterfaceInfoManager::FreeInterfaceInfoManager();
+
+  // 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();
+
+  NS_ShutdownAtomTable();
+
+  NS_IF_RELEASE(gDebug);
+
+  delete sIOThread;
+  sIOThread = nullptr;
+
+  delete sMessageLoop;
+  sMessageLoop = nullptr;
+
+  if (sCommandLineWasInitialized) {
+    CommandLine::Terminate();
+    sCommandLineWasInitialized = false;
+  }
+
+  delete sExitManager;
+  sExitManager = nullptr;
+
+  Omnijar::CleanUp();
+
+  HangMonitor::Shutdown();
+
+  delete sMainHangMonitor;
+  sMainHangMonitor = nullptr;
+
+  BackgroundHangMonitor::Shutdown();
+
+  profiler_shutdown();
+
+  NS_LogTerm();
+
+#if defined(MOZ_WIDGET_GONK)
+  // This _exit(0) call is intended to be temporary, to get shutdown leak
+  // checking working on non-B2G platforms.
+  // On debug B2G, the child process crashes very late.  Instead, just
+  // give up so at least we exit cleanly. See bug 1071866.
+  if (XRE_IsContentProcess()) {
+      NS_WARNING("Exiting child process early!");
+      _exit(0);
+  }
+#endif
+
+  return NS_OK;
+}
+
+} // namespace mozilla
diff --git a/xpcom/build/XPCOMModule.inc b/xpcom/build/XPCOMModule.inc
new file mode 100644
index 0000000000..5ac2885e2b
--- /dev/null
+++ b/xpcom/build/XPCOMModule.inc
@@ -0,0 +1,81 @@
+    COMPONENT_M(MEMORY, nsMemoryImpl::Create, Module::ALLOW_IN_GPU_PROCESS)
+    COMPONENT_M(DEBUG,  nsDebugImpl::Create, Module::ALLOW_IN_GPU_PROCESS)
+    COMPONENT(ERRORSERVICE, nsErrorService::Create)
+
+    COMPONENT_M(CATEGORYMANAGER, nsCategoryManager::Create, Module::ALLOW_IN_GPU_PROCESS)
+
+    COMPONENT(SCRIPTABLEINPUTSTREAM, nsScriptableInputStream::Create)
+    COMPONENT(BINARYINPUTSTREAM, nsBinaryInputStreamConstructor)
+    COMPONENT(BINARYOUTPUTSTREAM, nsBinaryOutputStreamConstructor)
+    COMPONENT(STORAGESTREAM, nsStorageStreamConstructor)
+    COMPONENT(VERSIONCOMPARATOR, nsVersionComparatorImplConstructor)
+    COMPONENT(SCRIPTABLEBASE64ENCODER, nsScriptableBase64EncoderConstructor)
+    COMPONENT(PIPE, nsPipeConstructor)
+
+    COMPONENT(PROPERTIES, nsPropertiesConstructor)
+
+    COMPONENT(PERSISTENTPROPERTIES, nsPersistentProperties::Create)
+
+    COMPONENT(SUPPORTSARRAY, nsSupportsArray::Create)
+    COMPONENT(ARRAY, nsArrayBase::XPCOMConstructor)
+    COMPONENT(CONSOLESERVICE, nsConsoleServiceConstructor)
+    COMPONENT(ATOMSERVICE, nsAtomServiceConstructor)
+    COMPONENT_M(OBSERVERSERVICE, nsObserverService::Create, Module::ALLOW_IN_GPU_PROCESS)
+
+    COMPONENT_M(TIMER, nsTimerConstructor, Module::ALLOW_IN_GPU_PROCESS)
+
+#define COMPONENT_SUPPORTS(TYPE, Type)                                         \
+  COMPONENT(SUPPORTS_##TYPE, nsSupports##Type##Constructor)
+
+    COMPONENT_SUPPORTS(ID, ID)
+    COMPONENT_SUPPORTS(STRING, String)
+    COMPONENT_SUPPORTS(CSTRING, CString)
+    COMPONENT_SUPPORTS(PRBOOL, PRBool)
+    COMPONENT_SUPPORTS(PRUINT8, PRUint8)
+    COMPONENT_SUPPORTS(PRUINT16, PRUint16)
+    COMPONENT_SUPPORTS(PRUINT32, PRUint32)
+    COMPONENT_SUPPORTS(PRUINT64, PRUint64)
+    COMPONENT_SUPPORTS(PRTIME, PRTime)
+    COMPONENT_SUPPORTS(CHAR, Char)
+    COMPONENT_SUPPORTS(PRINT16, PRInt16)
+    COMPONENT_SUPPORTS(PRINT32, PRInt32)
+    COMPONENT_SUPPORTS(PRINT64, PRInt64)
+    COMPONENT_SUPPORTS(FLOAT, Float)
+    COMPONENT_SUPPORTS(DOUBLE, Double)
+    COMPONENT_SUPPORTS(VOID, Void)
+    COMPONENT_SUPPORTS(INTERFACE_POINTER, InterfacePointer)
+
+#undef COMPONENT_SUPPORTS
+    COMPONENT(LOCAL_FILE, nsLocalFile::nsLocalFileConstructor)
+    COMPONENT(DIRECTORY_SERVICE, nsDirectoryService::Create)
+    COMPONENT(PROCESS, nsProcessConstructor)
+    COMPONENT(ENVIRONMENT, nsEnvironment::Create)
+
+    COMPONENT(THREADMANAGER, nsThreadManagerGetSingleton)
+    COMPONENT_M(THREADPOOL, nsThreadPoolConstructor, Module::ALLOW_IN_GPU_PROCESS)
+
+    COMPONENT(STRINGINPUTSTREAM, nsStringInputStreamConstructor)
+    COMPONENT(MULTIPLEXINPUTSTREAM, nsMultiplexInputStreamConstructor)
+
+    COMPONENT(VARIANT, nsVariantCCConstructor)
+    COMPONENT(INTERFACEINFOMANAGER_SERVICE, nsXPTIInterfaceInfoManagerGetSingleton)
+
+    COMPONENT(HASH_PROPERTY_BAG, nsHashPropertyBagCCConstructor)
+
+    COMPONENT(UUID_GENERATOR, nsUUIDGeneratorConstructor)
+
+#if defined(XP_WIN)
+    COMPONENT(WINDOWSREGKEY, nsWindowsRegKeyConstructor)
+#endif
+
+#if defined(MOZ_WIDGET_COCOA)
+    COMPONENT(MACUTILSIMPL, nsMacUtilsImplConstructor)
+#endif
+
+    COMPONENT(SYSTEMINFO, nsSystemInfoConstructor)
+    COMPONENT(MEMORY_REPORTER_MANAGER, nsMemoryReporterManagerConstructor)
+    COMPONENT(MEMORY_INFO_DUMPER, nsMemoryInfoDumperConstructor)
+    COMPONENT(IOUTIL, nsIOUtilConstructor)
+    COMPONENT(CYCLE_COLLECTOR_LOGGER, nsCycleCollectorLoggerConstructor)
+    COMPONENT(MESSAGE_LOOP, nsMessageLoopConstructor)
+    COMPONENT(STATUS_REPORTER_MANAGER, nsStatusReporterManagerConstructor)
diff --git a/xpcom/build/XREChildData.h b/xpcom/build/XREChildData.h
new file mode 100644
index 0000000000..487fede940
--- /dev/null
+++ b/xpcom/build/XREChildData.h
@@ -0,0 +1,51 @@
+/* -*- 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/. */
+
+#ifndef XREChildData_h
+#define XREChildData_h
+
+#include "mozilla/UniquePtr.h"
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+#include "mozilla/sandboxing/loggingTypes.h"
+
+namespace sandbox {
+class TargetServices;
+}
+#endif
+
+namespace mozilla {
+namespace gmp {
+class GMPLoader;
+}
+}
+
+/**
+ * Data needed to start a child process.
+ */
+struct XREChildData
+{
+#if !defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_WIDGET_GONK)
+  /**
+   * Used to load the GMP binary.
+   */
+  mozilla::UniquePtr<mozilla::gmp::GMPLoader> gmpLoader;
+#endif
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+  /**
+   * Chromium sandbox TargetServices.
+   */
+  sandbox::TargetServices* sandboxTargetServices = nullptr;
+
+  /**
+   * Function to provide a logging function to the chromium sandbox code.
+   */
+  mozilla::sandboxing::ProvideLogFunctionCb ProvideLogFunction = nullptr;
+#endif
+};
+
+#endif // XREChildData_h
diff --git a/xpcom/build/XREShellData.h b/xpcom/build/XREShellData.h
new file mode 100644
index 0000000000..11bc162d9c
--- /dev/null
+++ b/xpcom/build/XREShellData.h
@@ -0,0 +1,29 @@
+/* -*- 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/. */
+
+#ifndef XREShellData_h
+#define XREShellData_h
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+namespace sandbox {
+class BrokerServices;
+}
+#endif
+
+/**
+ * Data needed by XRE_XPCShellMain.
+ */
+struct XREShellData
+{
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+  /**
+   * Chromium sandbox BrokerServices.
+   */
+  sandbox::BrokerServices* sandboxBrokerServices;
+#endif
+};
+
+#endif // XREShellData_h
diff --git a/xpcom/build/mach_override.c b/xpcom/build/mach_override.c
new file mode 100644
index 0000000000..9e4940d298
--- /dev/null
+++ b/xpcom/build/mach_override.c
@@ -0,0 +1,789 @@
+// Copied from upstream at revision 195c13743fe0ebc658714e2a9567d86529f20443.
+// mach_override.c semver:1.2.0
+//   Copyright (c) 2003-2012 Jonathan 'Wolf' Rentzsch: http://rentzsch.com
+//   Some rights reserved: http://opensource.org/licenses/mit
+//   https://github.com/rentzsch/mach_override
+
+#include "mach_override.h"
+
+#include <mach-o/dyld.h>
+#include <mach/mach_host.h>
+#include <mach/mach_init.h>
+#include <mach/vm_map.h>
+#include <sys/mman.h>
+
+#include <CoreServices/CoreServices.h>
+
+/**************************
+*	
+*	Constants
+*	
+**************************/
+#pragma mark	-
+#pragma mark	(Constants)
+
+#define kPageSize 4096
+#if defined(__ppc__) || defined(__POWERPC__)
+
+long kIslandTemplate[] = {
+	0x9001FFFC,	//	stw		r0,-4(SP)
+	0x3C00DEAD,	//	lis		r0,0xDEAD
+	0x6000BEEF,	//	ori		r0,r0,0xBEEF
+	0x7C0903A6,	//	mtctr	r0
+	0x8001FFFC,	//	lwz		r0,-4(SP)
+	0x60000000,	//	nop		; optionally replaced
+	0x4E800420 	//	bctr
+};
+
+#define kAddressHi			3
+#define kAddressLo			5
+#define kInstructionHi		10
+#define kInstructionLo		11
+
+#elif defined(__i386__) 
+
+#define kOriginalInstructionsSize 16
+// On X86 we migh need to instert an add with a 32 bit immediate after the
+// original instructions.
+#define kMaxFixupSizeIncrease 5
+
+unsigned char kIslandTemplate[] = {
+	// kOriginalInstructionsSize nop instructions so that we 
+	// should have enough space to host original instructions 
+	0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 
+	0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+	// Now the real jump instruction
+	0xE9, 0xEF, 0xBE, 0xAD, 0xDE
+};
+
+#define kInstructions	0
+#define kJumpAddress    kInstructions + kOriginalInstructionsSize + 1
+#elif defined(__x86_64__)
+
+#define kOriginalInstructionsSize 32
+// On X86-64 we never need to instert a new instruction.
+#define kMaxFixupSizeIncrease 0
+
+#define kJumpAddress    kOriginalInstructionsSize + 6
+
+unsigned char kIslandTemplate[] = {
+	// kOriginalInstructionsSize nop instructions so that we 
+	// should have enough space to host original instructions 
+	0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 
+	0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+	0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 
+	0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
+	// Now the real jump instruction
+	0xFF, 0x25, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00
+};
+
+#endif
+
+/**************************
+*	
+*	Data Types
+*	
+**************************/
+#pragma mark	-
+#pragma mark	(Data Types)
+
+typedef	struct	{
+	char	instructions[sizeof(kIslandTemplate)];
+}	BranchIsland;
+
+/**************************
+*	
+*	Funky Protos
+*	
+**************************/
+#pragma mark	-
+#pragma mark	(Funky Protos)
+
+static mach_error_t
+allocateBranchIsland(
+		BranchIsland	**island,
+		void *originalFunctionAddress);
+
+	mach_error_t
+freeBranchIsland(
+		BranchIsland	*island );
+
+#if defined(__ppc__) || defined(__POWERPC__)
+	mach_error_t
+setBranchIslandTarget(
+		BranchIsland	*island,
+		const void		*branchTo,
+		long			instruction );
+#endif 
+
+#if defined(__i386__) || defined(__x86_64__)
+mach_error_t
+setBranchIslandTarget_i386(
+						   BranchIsland	*island,
+						   const void		*branchTo,
+						   char*			instructions );
+void 
+atomic_mov64(
+		uint64_t *targetAddress,
+		uint64_t value );
+
+	static Boolean 
+eatKnownInstructions( 
+	unsigned char	*code, 
+	uint64_t		*newInstruction,
+	int				*howManyEaten, 
+	char			*originalInstructions,
+	int				*originalInstructionCount, 
+	uint8_t			*originalInstructionSizes );
+
+	static void
+fixupInstructions(
+    uint32_t		offset,
+    void		*instructionsToFix,
+	int			instructionCount,
+	uint8_t		*instructionSizes );
+#endif
+
+/*******************************************************************************
+*	
+*	Interface
+*	
+*******************************************************************************/
+#pragma mark	-
+#pragma mark	(Interface)
+
+#if defined(__i386__) || defined(__x86_64__)
+mach_error_t makeIslandExecutable(void *address) {
+	mach_error_t err = err_none;
+    uintptr_t page = (uintptr_t)address & ~(uintptr_t)(kPageSize-1);
+    int e = err_none;
+    e |= mprotect((void *)page, kPageSize, PROT_EXEC | PROT_READ | PROT_WRITE);
+    e |= msync((void *)page, kPageSize, MS_INVALIDATE );
+    if (e) {
+        err = err_cannot_override;
+    }
+    return err;
+}
+#endif
+
+    mach_error_t
+mach_override_ptr(
+	void *originalFunctionAddress,
+    const void *overrideFunctionAddress,
+    void **originalFunctionReentryIsland )
+{
+	assert( originalFunctionAddress );
+	assert( overrideFunctionAddress );
+	
+	// this addresses overriding such functions as AudioOutputUnitStart()
+	// test with modified DefaultOutputUnit project
+#if defined(__x86_64__)
+    for(;;){
+        if(*(uint16_t*)originalFunctionAddress==0x25FF)    // jmp qword near [rip+0x????????]
+            originalFunctionAddress=*(void**)((char*)originalFunctionAddress+6+*(int32_t *)((uint16_t*)originalFunctionAddress+1));
+        else break;
+    }
+#elif defined(__i386__)
+    for(;;){
+        if(*(uint16_t*)originalFunctionAddress==0x25FF)    // jmp *0x????????
+            originalFunctionAddress=**(void***)((uint16_t*)originalFunctionAddress+1);
+        else break;
+    }
+#endif
+
+	long	*originalFunctionPtr = (long*) originalFunctionAddress;
+	mach_error_t	err = err_none;
+	
+#if defined(__ppc__) || defined(__POWERPC__)
+	//	Ensure first instruction isn't 'mfctr'.
+	#define	kMFCTRMask			0xfc1fffff
+	#define	kMFCTRInstruction	0x7c0903a6
+	
+	long	originalInstruction = *originalFunctionPtr;
+	if( !err && ((originalInstruction & kMFCTRMask) == kMFCTRInstruction) )
+		err = err_cannot_override;
+#elif defined(__i386__) || defined(__x86_64__)
+	int eatenCount = 0;
+	int originalInstructionCount = 0;
+	char originalInstructions[kOriginalInstructionsSize];
+	uint8_t originalInstructionSizes[kOriginalInstructionsSize];
+	uint64_t jumpRelativeInstruction = 0; // JMP
+
+	Boolean overridePossible = eatKnownInstructions ((unsigned char *)originalFunctionPtr, 
+										&jumpRelativeInstruction, &eatenCount, 
+										originalInstructions, &originalInstructionCount, 
+										originalInstructionSizes );
+	if (eatenCount + kMaxFixupSizeIncrease > kOriginalInstructionsSize) {
+		//printf ("Too many instructions eaten\n");
+		overridePossible = false;
+	}
+	if (!overridePossible) err = err_cannot_override;
+	if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
+#endif
+	
+	//	Make the original function implementation writable.
+	if( !err ) {
+		err = vm_protect( mach_task_self(),
+				(vm_address_t) originalFunctionPtr, 8, false,
+				(VM_PROT_ALL | VM_PROT_COPY) );
+		if( err )
+			err = vm_protect( mach_task_self(),
+					(vm_address_t) originalFunctionPtr, 8, false,
+					(VM_PROT_DEFAULT | VM_PROT_COPY) );
+	}
+	if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
+	
+	//	Allocate and target the escape island to the overriding function.
+	BranchIsland	*escapeIsland = NULL;
+	if( !err )	
+		err = allocateBranchIsland( &escapeIsland, originalFunctionAddress );
+		if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
+
+	
+#if defined(__ppc__) || defined(__POWERPC__)
+	if( !err )
+		err = setBranchIslandTarget( escapeIsland, overrideFunctionAddress, 0 );
+	
+	//	Build the branch absolute instruction to the escape island.
+	long	branchAbsoluteInstruction = 0; // Set to 0 just to silence warning.
+	if( !err ) {
+		long escapeIslandAddress = ((long) escapeIsland) & 0x3FFFFFF;
+		branchAbsoluteInstruction = 0x48000002 | escapeIslandAddress;
+	}
+#elif defined(__i386__) || defined(__x86_64__)
+        if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
+
+	if( !err )
+		err = setBranchIslandTarget_i386( escapeIsland, overrideFunctionAddress, 0 );
+ 
+	if (err) fprintf(stderr, "err = %x %s:%d\n", err, __FILE__, __LINE__);
+	// Build the jump relative instruction to the escape island
+#endif
+
+
+#if defined(__i386__) || defined(__x86_64__)
+	if (!err) {
+		uint32_t addressOffset = ((char*)escapeIsland - (char*)originalFunctionPtr - 5);
+		addressOffset = OSSwapInt32(addressOffset);
+		
+		jumpRelativeInstruction |= 0xE900000000000000LL; 
+		jumpRelativeInstruction |= ((uint64_t)addressOffset & 0xffffffff) << 24;
+		jumpRelativeInstruction = OSSwapInt64(jumpRelativeInstruction);		
+	}
+#endif
+	
+	//	Optionally allocate & return the reentry island. This may contain relocated
+	//  jmp instructions and so has all the same addressing reachability requirements
+	//  the escape island has to the original function, except the escape island is
+	//  technically our original function.
+	BranchIsland	*reentryIsland = NULL;
+	if( !err && originalFunctionReentryIsland ) {
+		err = allocateBranchIsland( &reentryIsland, escapeIsland);
+		if( !err )
+			*originalFunctionReentryIsland = reentryIsland;
+	}
+	
+#if defined(__ppc__) || defined(__POWERPC__)	
+	//	Atomically:
+	//	o If the reentry island was allocated:
+	//		o Insert the original instruction into the reentry island.
+	//		o Target the reentry island at the 2nd instruction of the
+	//		  original function.
+	//	o Replace the original instruction with the branch absolute.
+	if( !err ) {
+		int escapeIslandEngaged = false;
+		do {
+			if( reentryIsland )
+				err = setBranchIslandTarget( reentryIsland,
+						(void*) (originalFunctionPtr+1), originalInstruction );
+			if( !err ) {
+				escapeIslandEngaged = CompareAndSwap( originalInstruction,
+										branchAbsoluteInstruction,
+										(UInt32*)originalFunctionPtr );
+				if( !escapeIslandEngaged ) {
+					//	Someone replaced the instruction out from under us,
+					//	re-read the instruction, make sure it's still not
+					//	'mfctr' and try again.
+					originalInstruction = *originalFunctionPtr;
+					if( (originalInstruction & kMFCTRMask) == kMFCTRInstruction)
+						err = err_cannot_override;
+				}
+			}
+		} while( !err && !escapeIslandEngaged );
+	}
+#elif defined(__i386__) || defined(__x86_64__)
+	// Atomically:
+	//	o If the reentry island was allocated:
+	//		o Insert the original instructions into the reentry island.
+	//		o Target the reentry island at the first non-replaced 
+	//        instruction of the original function.
+	//	o Replace the original first instructions with the jump relative.
+	//
+	// Note that on i386, we do not support someone else changing the code under our feet
+	if ( !err ) {
+		uint32_t offset = (uintptr_t)originalFunctionPtr - (uintptr_t)reentryIsland;
+		fixupInstructions(offset, originalInstructions,
+					originalInstructionCount, originalInstructionSizes );
+	
+		if( reentryIsland )
+			err = setBranchIslandTarget_i386( reentryIsland,
+										 (void*) ((char *)originalFunctionPtr+eatenCount), originalInstructions );
+		// try making islands executable before planting the jmp
+#if defined(__x86_64__) || defined(__i386__)
+        if( !err )
+            err = makeIslandExecutable(escapeIsland);
+        if( !err && reentryIsland )
+            err = makeIslandExecutable(reentryIsland);
+#endif
+		if ( !err )
+			atomic_mov64((uint64_t *)originalFunctionPtr, jumpRelativeInstruction);
+	}
+#endif
+	
+	//	Clean up on error.
+	if( err ) {
+		if( reentryIsland )
+			freeBranchIsland( reentryIsland );
+		if( escapeIsland )
+			freeBranchIsland( escapeIsland );
+	}
+
+	return err;
+}
+
+/*******************************************************************************
+*	
+*	Implementation
+*	
+*******************************************************************************/
+#pragma mark	-
+#pragma mark	(Implementation)
+
+static bool jump_in_range(intptr_t from, intptr_t to) {
+  intptr_t field_value = to - from - 5;
+  int32_t field_value_32 = field_value;
+  return field_value == field_value_32;
+}
+
+/*******************************************************************************
+	Implementation: Allocates memory for a branch island.
+	
+	@param	island			<-	The allocated island.
+	@result					<-	mach_error_t
+
+	***************************************************************************/
+
+static mach_error_t
+allocateBranchIslandAux(
+		BranchIsland	**island,
+		void *originalFunctionAddress,
+		bool forward)
+{
+	assert( island );
+	assert( sizeof( BranchIsland ) <= kPageSize );
+
+	vm_map_t task_self = mach_task_self();
+	vm_address_t original_address = (vm_address_t) originalFunctionAddress;
+	vm_address_t address = original_address;
+
+	for (;;) {
+		vm_size_t vmsize = 0;
+		memory_object_name_t object = 0;
+		kern_return_t kr = 0;
+		vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
+		// Find the region the address is in.
+#if __WORDSIZE == 32
+		vm_region_basic_info_data_t info;
+		mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
+		kr = vm_region(task_self, &address, &vmsize, flavor,
+			       (vm_region_info_t)&info, &info_count, &object);
+#else
+		vm_region_basic_info_data_64_t info;
+		mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
+		kr = vm_region_64(task_self, &address, &vmsize, flavor,
+				  (vm_region_info_t)&info, &info_count, &object);
+#endif
+		if (kr != KERN_SUCCESS)
+			return kr;
+		assert((address & (kPageSize - 1)) == 0);
+
+		// Go to the first page before or after this region
+		vm_address_t new_address = forward ? address + vmsize : address - kPageSize;
+#if __WORDSIZE == 64
+		if(!jump_in_range(original_address, new_address))
+			break;
+#endif
+		address = new_address;
+
+		// Try to allocate this page.
+		kr = vm_allocate(task_self, &address, kPageSize, 0);
+		if (kr == KERN_SUCCESS) {
+			*island = (BranchIsland*) address;
+			return err_none;
+		}
+		if (kr != KERN_NO_SPACE)
+			return kr;
+	}
+
+	return KERN_NO_SPACE;
+}
+
+static mach_error_t
+allocateBranchIsland(
+		BranchIsland	**island,
+		void *originalFunctionAddress)
+{
+  mach_error_t err =
+    allocateBranchIslandAux(island, originalFunctionAddress, true);
+  if (!err)
+    return err;
+  return allocateBranchIslandAux(island, originalFunctionAddress, false);
+}
+
+
+/*******************************************************************************
+	Implementation: Deallocates memory for a branch island.
+	
+	@param	island	->	The island to deallocate.
+	@result			<-	mach_error_t
+
+	***************************************************************************/
+
+	mach_error_t
+freeBranchIsland(
+		BranchIsland	*island )
+{
+	assert( island );
+	assert( (*(long*)&island->instructions[0]) == kIslandTemplate[0] );
+	assert( sizeof( BranchIsland ) <= kPageSize );
+	return vm_deallocate( mach_task_self(), (vm_address_t) island,
+			      kPageSize );
+}
+
+/*******************************************************************************
+	Implementation: Sets the branch island's target, with an optional
+	instruction.
+	
+	@param	island		->	The branch island to insert target into.
+	@param	branchTo	->	The address of the target.
+	@param	instruction	->	Optional instruction to execute prior to branch. Set
+							to zero for nop.
+	@result				<-	mach_error_t
+
+	***************************************************************************/
+#if defined(__ppc__) || defined(__POWERPC__)
+	mach_error_t
+setBranchIslandTarget(
+		BranchIsland	*island,
+		const void		*branchTo,
+		long			instruction )
+{
+	//	Copy over the template code.
+    bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
+    
+    //	Fill in the address.
+    ((short*)island->instructions)[kAddressLo] = ((long) branchTo) & 0x0000FFFF;
+    ((short*)island->instructions)[kAddressHi]
+    	= (((long) branchTo) >> 16) & 0x0000FFFF;
+    
+    //	Fill in the (optional) instuction.
+    if( instruction != 0 ) {
+        ((short*)island->instructions)[kInstructionLo]
+        	= instruction & 0x0000FFFF;
+        ((short*)island->instructions)[kInstructionHi]
+        	= (instruction >> 16) & 0x0000FFFF;
+    }
+    
+    //MakeDataExecutable( island->instructions, sizeof( kIslandTemplate ) );
+	msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
+    
+    return err_none;
+}
+#endif 
+
+#if defined(__i386__)
+	mach_error_t
+setBranchIslandTarget_i386(
+	BranchIsland	*island,
+	const void		*branchTo,
+	char*			instructions )
+{
+
+	//	Copy over the template code.
+    bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
+
+	// copy original instructions
+	if (instructions) {
+		bcopy (instructions, island->instructions + kInstructions, kOriginalInstructionsSize);
+	}
+	
+    // Fill in the address.
+    int32_t addressOffset = (char *)branchTo - (island->instructions + kJumpAddress + 4);
+    *((int32_t *)(island->instructions + kJumpAddress)) = addressOffset; 
+
+    msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
+    return err_none;
+}
+
+#elif defined(__x86_64__)
+mach_error_t
+setBranchIslandTarget_i386(
+        BranchIsland	*island,
+        const void		*branchTo,
+        char*			instructions )
+{
+    // Copy over the template code.
+    bcopy( kIslandTemplate, island->instructions, sizeof( kIslandTemplate ) );
+
+    // Copy original instructions.
+    if (instructions) {
+        bcopy (instructions, island->instructions, kOriginalInstructionsSize);
+    }
+
+    //	Fill in the address.
+    *((uint64_t *)(island->instructions + kJumpAddress)) = (uint64_t)branchTo; 
+    msync( island->instructions, sizeof( kIslandTemplate ), MS_INVALIDATE );
+
+    return err_none;
+}
+#endif
+
+
+#if defined(__i386__) || defined(__x86_64__)
+// simplistic instruction matching
+typedef struct {
+	unsigned int length; // max 15
+	unsigned char mask[15]; // sequence of bytes in memory order
+	unsigned char constraint[15]; // sequence of bytes in memory order
+}	AsmInstructionMatch;
+
+#if defined(__i386__)
+static AsmInstructionMatch possibleInstructions[] = {
+	{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE9, 0x00, 0x00, 0x00, 0x00} },	// jmp 0x????????
+	{ 0x5, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, {0x55, 0x89, 0xe5, 0xc9, 0xc3} },	// push %ebp; mov %esp,%ebp; leave; ret
+	{ 0x1, {0xFF}, {0x90} },							// nop
+	{ 0x1, {0xFF}, {0x55} },							// push %esp
+	{ 0x2, {0xFF, 0xFF}, {0x89, 0xE5} },				                // mov %esp,%ebp
+	{ 0x1, {0xFF}, {0x53} },							// push %ebx
+	{ 0x3, {0xFF, 0xFF, 0x00}, {0x83, 0xEC, 0x00} },	                        // sub 0x??, %esp
+	{ 0x6, {0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00}, {0x81, 0xEC, 0x00, 0x00, 0x00, 0x00} },	// sub 0x??, %esp with 32bit immediate
+	{ 0x1, {0xFF}, {0x57} },							// push %edi
+	{ 0x1, {0xFF}, {0x56} },							// push %esi
+	{ 0x2, {0xFF, 0xFF}, {0x31, 0xC0} },						// xor %eax, %eax
+	{ 0x3, {0xFF, 0x4F, 0x00}, {0x8B, 0x45, 0x00} },  // mov $imm(%ebp), %reg
+	{ 0x3, {0xFF, 0x4C, 0x00}, {0x8B, 0x40, 0x00} },  // mov $imm(%eax-%edx), %reg
+	{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x8B, 0x4C, 0x24, 0x00} },  // mov $imm(%esp), %ecx
+	{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xB8, 0x00, 0x00, 0x00, 0x00} },	// mov $imm, %eax
+	{ 0x6, {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, {0xE8, 0x00, 0x00, 0x00, 0x00, 0x58} },	// call $imm; pop %eax
+	{ 0x0 }
+};
+#elif defined(__x86_64__)
+static AsmInstructionMatch possibleInstructions[] = {
+	{ 0x5, {0xFF, 0x00, 0x00, 0x00, 0x00}, {0xE9, 0x00, 0x00, 0x00, 0x00} },	// jmp 0x????????
+	{ 0x1, {0xFF}, {0x90} },							// nop
+	{ 0x1, {0xF8}, {0x50} },							// push %rX
+	{ 0x3, {0xFF, 0xFF, 0xFF}, {0x48, 0x89, 0xE5} },				// mov %rsp,%rbp
+	{ 0x4, {0xFF, 0xFF, 0xFF, 0x00}, {0x48, 0x83, 0xEC, 0x00} },	                // sub 0x??, %rsp
+	{ 0x4, {0xFB, 0xFF, 0x00, 0x00}, {0x48, 0x89, 0x00, 0x00} },	                // move onto rbp
+	{ 0x4, {0xFF, 0xFF, 0xFF, 0xFF}, {0x40, 0x0f, 0xbe, 0xce} },			// movsbl %sil, %ecx
+	{ 0x2, {0xFF, 0x00}, {0x41, 0x00} },						// push %rXX
+	{ 0x2, {0xFF, 0x00}, {0x85, 0x00} },						// test %rX,%rX
+	{ 0x5, {0xF8, 0x00, 0x00, 0x00, 0x00}, {0xB8, 0x00, 0x00, 0x00, 0x00} },   // mov $imm, %reg
+	{ 0x3, {0xFF, 0xFF, 0x00}, {0xFF, 0x77, 0x00} },  // pushq $imm(%rdi)
+	{ 0x2, {0xFF, 0xFF}, {0x31, 0xC0} },						// xor %eax, %eax
+	{ 0x2, {0xFF, 0xFF}, {0x89, 0xF8} },			// mov %edi, %eax
+
+	//leaq offset(%rip),%rax
+	{ 0x7, {0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00}, {0x48, 0x8d, 0x05, 0x00, 0x00, 0x00, 0x00} },
+
+	{ 0x0 }
+};
+#endif
+
+static Boolean codeMatchesInstruction(unsigned char *code, AsmInstructionMatch* instruction) 
+{
+	Boolean match = true;
+	
+	size_t i;
+	for (i=0; i<instruction->length; i++) {
+		unsigned char mask = instruction->mask[i];
+		unsigned char constraint = instruction->constraint[i];
+		unsigned char codeValue = code[i];
+				
+		match = ((codeValue & mask) == constraint);
+		if (!match) break;
+	}
+	
+	return match;
+}
+
+#if defined(__i386__) || defined(__x86_64__)
+	static Boolean 
+eatKnownInstructions( 
+	unsigned char	*code, 
+	uint64_t		*newInstruction,
+	int				*howManyEaten, 
+	char			*originalInstructions,
+	int				*originalInstructionCount, 
+	uint8_t			*originalInstructionSizes )
+{
+	Boolean allInstructionsKnown = true;
+	int totalEaten = 0;
+	unsigned char* ptr = code;
+	int remainsToEat = 5; // a JMP instruction takes 5 bytes
+	int instructionIndex = 0;
+	
+	if (howManyEaten) *howManyEaten = 0;
+	if (originalInstructionCount) *originalInstructionCount = 0;
+	while (remainsToEat > 0) {
+		Boolean curInstructionKnown = false;
+		
+		// See if instruction matches one  we know
+		AsmInstructionMatch* curInstr = possibleInstructions;
+		do { 
+			if ((curInstructionKnown = codeMatchesInstruction(ptr, curInstr))) break;
+			curInstr++;
+		} while (curInstr->length > 0);
+		
+		// if all instruction matches failed, we don't know current instruction then, stop here
+		if (!curInstructionKnown) { 
+			allInstructionsKnown = false;
+			fprintf(stderr, "mach_override: some instructions unknown! Need to update mach_override.c\n");
+			break;
+		}
+		
+		// At this point, we've matched curInstr
+		int eaten = curInstr->length;
+		ptr += eaten;
+		remainsToEat -= eaten;
+		totalEaten += eaten;
+		
+		if (originalInstructionSizes) originalInstructionSizes[instructionIndex] = eaten;
+		instructionIndex += 1;
+		if (originalInstructionCount) *originalInstructionCount = instructionIndex;
+	}
+
+
+	if (howManyEaten) *howManyEaten = totalEaten;
+
+	if (originalInstructions) {
+		Boolean enoughSpaceForOriginalInstructions = (totalEaten < kOriginalInstructionsSize);
+		
+		if (enoughSpaceForOriginalInstructions) {
+			memset(originalInstructions, 0x90 /* NOP */, kOriginalInstructionsSize); // fill instructions with NOP
+			bcopy(code, originalInstructions, totalEaten);
+		} else {
+			// printf ("Not enough space in island to store original instructions. Adapt the island definition and kOriginalInstructionsSize\n");
+			return false;
+		}
+	}
+	
+	if (allInstructionsKnown) {
+		// save last 3 bytes of first 64bits of codre we'll replace
+		uint64_t currentFirst64BitsOfCode = *((uint64_t *)code);
+		currentFirst64BitsOfCode = OSSwapInt64(currentFirst64BitsOfCode); // back to memory representation
+		currentFirst64BitsOfCode &= 0x0000000000FFFFFFLL; 
+		
+		// keep only last 3 instructions bytes, first 5 will be replaced by JMP instr
+		*newInstruction &= 0xFFFFFFFFFF000000LL; // clear last 3 bytes
+		*newInstruction |= (currentFirst64BitsOfCode & 0x0000000000FFFFFFLL); // set last 3 bytes
+	}
+
+	return allInstructionsKnown;
+}
+
+	static void
+fixupInstructions(
+	uint32_t	offset,
+    void		*instructionsToFix,
+	int			instructionCount,
+	uint8_t		*instructionSizes )
+{
+	// The start of "leaq offset(%rip),%rax"
+	static const uint8_t LeaqHeader[] = {0x48, 0x8d, 0x05};
+
+	int	index;
+	for (index = 0;index < instructionCount;index += 1)
+	{
+		if (*(uint8_t*)instructionsToFix == 0xE9) // 32-bit jump relative
+		{
+			uint32_t *jumpOffsetPtr = (uint32_t*)((uintptr_t)instructionsToFix + 1);
+			*jumpOffsetPtr += offset;
+		}
+
+		// leaq offset(%rip),%rax
+		if (memcmp(instructionsToFix, LeaqHeader, 3) == 0) {
+			uint32_t *LeaqOffsetPtr = (uint32_t*)((uintptr_t)instructionsToFix + 3);
+			*LeaqOffsetPtr += offset;
+		}
+
+		// 32-bit call relative to the next addr; pop %eax
+		if (*(uint8_t*)instructionsToFix == 0xE8)
+		{
+			// Just this call is larger than the jump we use, so we
+			// know this is the last instruction.
+			assert(index == (instructionCount - 1));
+			assert(instructionSizes[index] == 6);
+
+                        // Insert "addl $offset, %eax" in the end so that when
+                        // we jump to the rest of the function %eax has the
+                        // value it would have if eip had been pushed by the
+                        // call in its original position.
+			uint8_t *op = instructionsToFix;
+			op += 6;
+			*op = 0x05; // addl
+			uint32_t *addImmPtr = (uint32_t*)(op + 1);
+			*addImmPtr = offset;
+		}
+
+		instructionsToFix = (void*)((uintptr_t)instructionsToFix + instructionSizes[index]);
+    }
+}
+#endif
+
+#if defined(__i386__)
+__asm(
+			".text;"
+			".align 2, 0x90;"
+			"_atomic_mov64:;"
+			"	pushl %ebp;"
+			"	movl %esp, %ebp;"
+			"	pushl %esi;"
+			"	pushl %ebx;"
+			"	pushl %ecx;"
+			"	pushl %eax;"
+			"	pushl %edx;"
+	
+			// atomic push of value to an address
+			// we use cmpxchg8b, which compares content of an address with 
+			// edx:eax. If they are equal, it atomically puts 64bit value 
+			// ecx:ebx in address. 
+			// We thus put contents of address in edx:eax to force ecx:ebx
+			// in address
+			"	mov		8(%ebp), %esi;"  // esi contains target address
+			"	mov		12(%ebp), %ebx;"
+			"	mov		16(%ebp), %ecx;" // ecx:ebx now contains value to put in target address
+			"	mov		(%esi), %eax;"
+			"	mov		4(%esi), %edx;"  // edx:eax now contains value currently contained in target address
+			"	lock; cmpxchg8b	(%esi);" // atomic move.
+			
+			// restore registers
+			"	popl %edx;"
+			"	popl %eax;"
+			"	popl %ecx;"
+			"	popl %ebx;"
+			"	popl %esi;"
+			"	popl %ebp;"
+			"	ret"
+);
+#elif defined(__x86_64__)
+void atomic_mov64(
+		uint64_t *targetAddress,
+		uint64_t value )
+{
+    *targetAddress = value;
+}
+#endif
+#endif
diff --git a/xpcom/build/mach_override.h b/xpcom/build/mach_override.h
new file mode 100644
index 0000000000..d9be988a34
--- /dev/null
+++ b/xpcom/build/mach_override.h
@@ -0,0 +1,121 @@
+/*******************************************************************************
+	mach_override.h
+		Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
+		Some rights reserved: <http://opensource.org/licenses/mit-license.php>
+
+	***************************************************************************/
+
+/***************************************************************************//**
+	@mainpage	mach_override
+	@author		Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
+	
+	This package, coded in C to the Mach API, allows you to override ("patch")
+	program- and system-supplied functions at runtime. You can fully replace
+	functions with your implementations, or merely head- or tail-patch the
+	original implementations.
+	
+	Use it by #include'ing mach_override.h from your .c, .m or .mm file(s).
+	
+	@todo	Discontinue use of Carbon's MakeDataExecutable() and
+			CompareAndSwap() calls and start using the Mach equivalents, if they
+			exist. If they don't, write them and roll them in. That way, this
+			code will be pure Mach, which will make it easier to use everywhere.
+			Update: MakeDataExecutable() has been replaced by
+			msync(MS_INVALIDATE). There is an OSCompareAndSwap in libkern, but
+			I'm currently unsure if I can link against it. May have to roll in
+			my own version...
+	@todo	Stop using an entire 4K high-allocated VM page per 28-byte escape
+			branch island. Done right, this will dramatically speed up escape
+			island allocations when they number over 250. Then again, if you're
+			overriding more than 250 functions, maybe speed isn't your main
+			concern...
+	@todo	Add detection of: b, bl, bla, bc, bcl, bcla, bcctrl, bclrl
+			first-instructions. Initially, we should refuse to override
+			functions beginning with these instructions. Eventually, we should
+			dynamically rewrite them to make them position-independent.
+	@todo	Write mach_unoverride(), which would remove an override placed on a
+			function. Must be multiple-override aware, which means an almost
+			complete rewrite under the covers, because the target address can't
+			be spread across two load instructions like it is now since it will
+			need to be atomically updatable.
+	@todo	Add non-rentry variants of overrides to test_mach_override.
+
+	***************************************************************************/
+
+#ifndef		_mach_override_
+#define		_mach_override_
+
+#include <sys/types.h>
+#include <mach/error.h>
+
+#ifdef	__cplusplus
+	extern	"C"	{
+#endif
+
+/**
+	Returned if the function to be overrided begins with a 'mfctr' instruction.
+*/
+#define	err_cannot_override	(err_local|1)
+
+/************************************************************************************//**
+	Dynamically overrides the function implementation referenced by
+	originalFunctionAddress with the implentation pointed to by overrideFunctionAddress.
+	Optionally returns a pointer to a "reentry island" which, if jumped to, will resume
+	the original implementation.
+	
+	@param	originalFunctionAddress			->	Required address of the function to
+												override (with overrideFunctionAddress).
+	@param	overrideFunctionAddress			->	Required address to the overriding
+												function.
+	@param	originalFunctionReentryIsland	<-	Optional pointer to pointer to the
+												reentry island. Can be nullptr.
+	@result									<-	err_cannot_override if the original
+												function's implementation begins with
+												the 'mfctr' instruction.
+
+	************************************************************************************/
+
+    mach_error_t
+mach_override_ptr(
+	void *originalFunctionAddress,
+    const void *overrideFunctionAddress,
+    void **originalFunctionReentryIsland );
+
+/************************************************************************************//**
+	
+
+	************************************************************************************/
+ 
+#ifdef	__cplusplus
+
+#define MACH_OVERRIDE( ORIGINAL_FUNCTION_RETURN_TYPE, ORIGINAL_FUNCTION_NAME, ORIGINAL_FUNCTION_ARGS, ERR )			\
+	{																												\
+		static ORIGINAL_FUNCTION_RETURN_TYPE (*ORIGINAL_FUNCTION_NAME##_reenter)ORIGINAL_FUNCTION_ARGS;				\
+		static bool ORIGINAL_FUNCTION_NAME##_overriden = false;														\
+		class mach_override_class__##ORIGINAL_FUNCTION_NAME {														\
+		public:																										\
+			static kern_return_t override(void *originalFunctionPtr) {												\
+				kern_return_t result = err_none;																	\
+				if (!ORIGINAL_FUNCTION_NAME##_overriden) {															\
+					ORIGINAL_FUNCTION_NAME##_overriden = true;														\
+					result = mach_override_ptr( (void*)originalFunctionPtr,											\
+												(void*)mach_override_class__##ORIGINAL_FUNCTION_NAME::replacement,	\
+												(void**)&ORIGINAL_FUNCTION_NAME##_reenter );						\
+				}																									\
+				return result;																						\
+			}																										\
+			static ORIGINAL_FUNCTION_RETURN_TYPE replacement ORIGINAL_FUNCTION_ARGS {
+
+#define END_MACH_OVERRIDE( ORIGINAL_FUNCTION_NAME )																	\
+			}																										\
+		};																											\
+																													\
+		err = mach_override_class__##ORIGINAL_FUNCTION_NAME::override((void*)ORIGINAL_FUNCTION_NAME);				\
+	}
+ 
+#endif
+
+#ifdef	__cplusplus
+	}
+#endif
+#endif	//	_mach_override_
diff --git a/xpcom/build/moz.build b/xpcom/build/moz.build
new file mode 100644
index 0000000000..68bd001a2e
--- /dev/null
+++ b/xpcom/build/moz.build
@@ -0,0 +1,102 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXPORTS += [
+    'nsXPCOM.h',
+    'nsXPCOMCID.h',
+    'nsXPCOMCIDInternal.h',
+    'nsXREAppData.h',
+    'nsXULAppAPI.h',
+    'XREChildData.h',
+    'xrecore.h',
+    'XREShellData.h',
+]
+
+EXPORTS.mozilla += [
+    'FileLocation.h',
+    'IOInterposer.h',
+    'LateWriteChecks.h',
+    'Omnijar.h',
+    'PoisonIOInterposer.h',
+    'ServiceList.h',
+    'Services.h',
+    'XPCOM.h',
+]
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    EXPORTS += ['nsWindowsDllInterceptor.h']
+    EXPORTS.mozilla += ['perfprobe.h']
+    SOURCES += [
+        'perfprobe.cpp',
+        'PoisonIOInterposerBase.cpp',
+        'PoisonIOInterposerWin.cpp',
+    ]
+elif CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
+    UNIFIED_SOURCES += [
+        'PoisonIOInterposerBase.cpp',
+        'PoisonIOInterposerMac.cpp',
+    ]
+    SOURCES += ['mach_override.c']
+    SOURCES['mach_override.c'].flags += ['-Wno-unused-function']
+else:
+    SOURCES += ['PoisonIOInterposerStub.cpp']
+
+include('../glue/objs.mozbuild')
+
+UNIFIED_SOURCES += xpcom_gluens_src_cppsrcs
+UNIFIED_SOURCES += xpcom_glue_src_cppsrcs
+
+UNIFIED_SOURCES += [
+    'FrozenFunctions.cpp',
+    'IOInterposer.cpp',
+    'LateWriteChecks.cpp',
+    'MainThreadIOLogger.cpp',
+    'nsXPCOMStrings.cpp',
+    'Services.cpp',
+    'XPCOMInit.cpp',
+]
+
+if CONFIG['OS_ARCH'] != 'WINNT':
+    SOURCES += [
+        'NSPRInterposer.cpp',
+    ]
+
+# FileLocation.cpp and Omnijar.cpp cannot be built in unified mode because they
+# use plarena.h.
+SOURCES += [
+    'FileLocation.cpp',
+    'Omnijar.cpp',
+]
+
+include('/ipc/chromium/chromium-config.mozbuild')
+
+FINAL_LIBRARY = 'xul'
+
+DEFINES['_IMPL_NS_STRINGAPI'] = True
+DEFINES['OMNIJAR_NAME'] = CONFIG['OMNIJAR_NAME']
+if CONFIG['MOZ_ICU_DATA_ARCHIVE']:
+    DEFINES['MOZ_ICU_DATA_ARCHIVE'] = True
+
+LOCAL_INCLUDES += [
+    '!..',
+    '../base',
+    '../components',
+    '../ds',
+    '../glue',
+    '../io',
+    '../reflect/xptinfo',
+    '../threads',
+    '/chrome',
+    '/docshell/base',
+]
+
+if CONFIG['MOZ_VPX']:
+    LOCAL_INCLUDES += [
+        '/media/libvpx',
+    ]
+
+if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'cocoa':
+    CXXFLAGS += CONFIG['TK_CFLAGS']
diff --git a/xpcom/build/nsWindowsDllInterceptor.h b/xpcom/build/nsWindowsDllInterceptor.h
new file mode 100644
index 0000000000..f7b7c93fbd
--- /dev/null
+++ b/xpcom/build/nsWindowsDllInterceptor.h
@@ -0,0 +1,1127 @@
+/* -*- 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/. */
+
+#ifndef NS_WINDOWS_DLL_INTERCEPTOR_H_
+#define NS_WINDOWS_DLL_INTERCEPTOR_H_
+
+#include "mozilla/Assertions.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/UniquePtr.h"
+#include "nsWindowsHelpers.h"
+
+#include <wchar.h>
+#include <windows.h>
+#include <winternl.h>
+
+/*
+ * Simple function interception.
+ *
+ * We have two separate mechanisms for intercepting a function: We can use the
+ * built-in nop space, if it exists, or we can create a detour.
+ *
+ * Using the built-in nop space works as follows: On x86-32, DLL functions
+ * begin with a two-byte nop (mov edi, edi) and are preceeded by five bytes of
+ * NOP instructions.
+ *
+ * When we detect a function with this prelude, we do the following:
+ *
+ * 1. Write a long jump to our interceptor function into the five bytes of NOPs
+ *    before the function.
+ *
+ * 2. Write a short jump -5 into the two-byte nop at the beginning of the function.
+ *
+ * This mechanism is nice because it's thread-safe.  It's even safe to do if
+ * another thread is currently running the function we're modifying!
+ *
+ * When the WindowsDllNopSpacePatcher is destroyed, we overwrite the short jump
+ * but not the long jump, so re-intercepting the same function won't work,
+ * because its prelude won't match.
+ *
+ *
+ * Unfortunately nop space patching doesn't work on functions which don't have
+ * this magic prelude (and in particular, x86-64 never has the prelude).  So
+ * when we can't use the built-in nop space, we fall back to using a detour,
+ * which works as follows:
+ *
+ * 1. Save first N bytes of OrigFunction to trampoline, where N is a
+ *    number of bytes >= 5 that are instruction aligned.
+ *
+ * 2. Replace first 5 bytes of OrigFunction with a jump to the Hook
+ *    function.
+ *
+ * 3. After N bytes of the trampoline, add a jump to OrigFunction+N to
+ *    continue original program flow.
+ *
+ * 4. Hook function needs to call the trampoline during its execution,
+ *    to invoke the original function (so address of trampoline is
+ *    returned).
+ *
+ * When the WindowsDllDetourPatcher object is destructed, OrigFunction is
+ * patched again to jump directly to the trampoline instead of going through
+ * the hook function. As such, re-intercepting the same function won't work, as
+ * jump instructions are not supported.
+ *
+ * Note that this is not thread-safe.  Sad day.
+ *
+ */
+
+#include <stdint.h>
+
+namespace mozilla {
+namespace internal {
+
+class AutoVirtualProtect
+{
+public:
+  AutoVirtualProtect(void* aFunc, size_t aSize, DWORD aProtect)
+    : mFunc(aFunc), mSize(aSize), mNewProtect(aProtect), mOldProtect(0),
+      mSuccess(false)
+  {}
+
+  ~AutoVirtualProtect()
+  {
+    if (mSuccess) {
+      VirtualProtectEx(GetCurrentProcess(), mFunc, mSize, mOldProtect,
+                       &mOldProtect);
+    }
+  }
+
+  bool Protect()
+  {
+    mSuccess = !!VirtualProtectEx(GetCurrentProcess(), mFunc, mSize,
+                                  mNewProtect, &mOldProtect);
+    if (!mSuccess) {
+      // printf("VirtualProtectEx failed! %d\n", GetLastError());
+    }
+    return mSuccess;
+  }
+
+private:
+  void* const mFunc;
+  size_t const mSize;
+  DWORD const mNewProtect;
+  DWORD mOldProtect;
+  bool mSuccess;
+};
+
+class WindowsDllNopSpacePatcher
+{
+  typedef uint8_t* byteptr_t;
+  HMODULE mModule;
+
+  // Dumb array for remembering the addresses of functions we've patched.
+  // (This should be nsTArray, but non-XPCOM code uses this class.)
+  static const size_t maxPatchedFns = 128;
+  byteptr_t mPatchedFns[maxPatchedFns];
+  int mPatchedFnsLen;
+
+public:
+  WindowsDllNopSpacePatcher()
+    : mModule(0)
+    , mPatchedFnsLen(0)
+  {}
+
+#if defined(_M_IX86)
+  ~WindowsDllNopSpacePatcher()
+  {
+    // Restore the mov edi, edi to the beginning of each function we patched.
+
+    for (int i = 0; i < mPatchedFnsLen; i++) {
+      byteptr_t fn = mPatchedFns[i];
+
+      // Ensure we can write to the code.
+      AutoVirtualProtect protect(fn, 2, PAGE_EXECUTE_READWRITE);
+      if (!protect.Protect()) {
+        continue;
+      }
+
+      // mov edi, edi
+      *((uint16_t*)fn) = 0xff8b;
+
+      // I don't think this is actually necessary, but it can't hurt.
+      FlushInstructionCache(GetCurrentProcess(),
+                            /* ignored */ nullptr,
+                            /* ignored */ 0);
+    }
+  }
+
+  void Init(const char* aModuleName)
+  {
+    if (!IsCompatible()) {
+#if defined(MOZILLA_INTERNAL_API)
+      NS_WARNING("NOP space patching is unavailable for compatibility reasons");
+#endif
+      return;
+    }
+
+    mModule = LoadLibraryExA(aModuleName, nullptr, 0);
+    if (!mModule) {
+      //printf("LoadLibraryEx for '%s' failed\n", aModuleName);
+      return;
+    }
+  }
+
+  /**
+   * NVIDIA Optimus drivers utilize Microsoft Detours 2.x to patch functions
+   * in our address space. There is a bug in Detours 2.x that causes it to
+   * patch at the wrong address when attempting to detour code that is already
+   * NOP space patched. This function is an effort to detect the presence of
+   * this NVIDIA code in our address space and disable NOP space patching if it
+   * is. We also check AppInit_DLLs since this is the mechanism that the Optimus
+   * drivers use to inject into our process.
+   */
+  static bool IsCompatible()
+  {
+    // These DLLs are known to have bad interactions with this style of patching
+    const wchar_t* kIncompatibleDLLs[] = {
+      L"detoured.dll",
+      L"_etoured.dll",
+      L"nvd3d9wrap.dll",
+      L"nvdxgiwrap.dll"
+    };
+    // See if the infringing DLLs are already loaded
+    for (unsigned int i = 0; i < mozilla::ArrayLength(kIncompatibleDLLs); ++i) {
+      if (GetModuleHandleW(kIncompatibleDLLs[i])) {
+        return false;
+      }
+    }
+    if (GetModuleHandleW(L"user32.dll")) {
+      // user32 is loaded but the infringing DLLs are not, assume we're safe to
+      // proceed.
+      return true;
+    }
+    // If user32 has not loaded yet, check AppInit_DLLs to ensure that Optimus
+    // won't be loaded once user32 is initialized.
+    HKEY hkey = NULL;
+    if (!RegOpenKeyExW(HKEY_LOCAL_MACHINE,
+          L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Windows",
+          0, KEY_QUERY_VALUE, &hkey)) {
+      nsAutoRegKey key(hkey);
+      DWORD numBytes = 0;
+      const wchar_t kAppInitDLLs[] = L"AppInit_DLLs";
+      // Query for required buffer size
+      LONG status = RegQueryValueExW(hkey, kAppInitDLLs, nullptr,
+                                     nullptr, nullptr, &numBytes);
+      mozilla::UniquePtr<wchar_t[]> data;
+      if (!status) {
+        // Allocate the buffer and query for the actual data
+        data = mozilla::MakeUnique<wchar_t[]>(numBytes / sizeof(wchar_t));
+        status = RegQueryValueExW(hkey, kAppInitDLLs, nullptr,
+                                  nullptr, (LPBYTE)data.get(), &numBytes);
+      }
+      if (!status) {
+        // For each token, split up the filename components and then check the
+        // name of the file.
+        const wchar_t kDelimiters[] = L", ";
+        wchar_t* tokenContext = nullptr;
+        wchar_t* token = wcstok_s(data.get(), kDelimiters, &tokenContext);
+        while (token) {
+          wchar_t fname[_MAX_FNAME] = {0};
+          if (!_wsplitpath_s(token, nullptr, 0, nullptr, 0,
+                             fname, mozilla::ArrayLength(fname),
+                             nullptr, 0)) {
+            // nvinit.dll is responsible for bootstrapping the DLL injection, so
+            // that is the library that we check for here
+            const wchar_t kNvInitName[] = L"nvinit";
+            if (!_wcsnicmp(fname, kNvInitName,
+                           mozilla::ArrayLength(kNvInitName))) {
+              return false;
+            }
+          }
+          token = wcstok_s(nullptr, kDelimiters, &tokenContext);
+        }
+      }
+    }
+    return true;
+  }
+
+  bool AddHook(const char* aName, intptr_t aHookDest, void** aOrigFunc)
+  {
+    if (!mModule) {
+      return false;
+    }
+
+    if (!IsCompatible()) {
+#if defined(MOZILLA_INTERNAL_API)
+      NS_WARNING("NOP space patching is unavailable for compatibility reasons");
+#endif
+      return false;
+    }
+
+    if (mPatchedFnsLen == maxPatchedFns) {
+      // printf ("No space for hook in mPatchedFns.\n");
+      return false;
+    }
+
+    byteptr_t fn = reinterpret_cast<byteptr_t>(GetProcAddress(mModule, aName));
+    if (!fn) {
+      //printf ("GetProcAddress failed\n");
+      return false;
+    }
+
+    fn = ResolveRedirectedAddress(fn);
+
+    // Ensure we can read and write starting at fn - 5 (for the long jmp we're
+    // going to write) and ending at fn + 2 (for the short jmp up to the long
+    // jmp). These bytes may span two pages with different protection.
+    AutoVirtualProtect protectBefore(fn - 5, 5, PAGE_EXECUTE_READWRITE);
+    AutoVirtualProtect protectAfter(fn, 2, PAGE_EXECUTE_READWRITE);
+    if (!protectBefore.Protect() || !protectAfter.Protect()) {
+      return false;
+    }
+
+    bool rv = WriteHook(fn, aHookDest, aOrigFunc);
+
+    if (rv) {
+      mPatchedFns[mPatchedFnsLen] = fn;
+      mPatchedFnsLen++;
+    }
+
+    return rv;
+  }
+
+  bool WriteHook(byteptr_t aFn, intptr_t aHookDest, void** aOrigFunc)
+  {
+    // Check that the 5 bytes before aFn are NOP's or INT 3's,
+    // and that the 2 bytes after aFn are mov(edi, edi).
+    //
+    // It's safe to read aFn[-5] because we set it to PAGE_EXECUTE_READWRITE
+    // before calling WriteHook.
+
+    for (int i = -5; i <= -1; i++) {
+      if (aFn[i] != 0x90 && aFn[i] != 0xcc) { // nop or int 3
+        return false;
+      }
+    }
+
+    // mov edi, edi.  Yes, there are two ways to encode the same thing:
+    //
+    //   0x89ff == mov r/m, r
+    //   0x8bff == mov r, r/m
+    //
+    // where "r" is register and "r/m" is register or memory.  Windows seems to
+    // use 8bff; I include 89ff out of paranoia.
+    if ((aFn[0] != 0x8b && aFn[0] != 0x89) || aFn[1] != 0xff) {
+      return false;
+    }
+
+    // Write a long jump into the space above the function.
+    aFn[-5] = 0xe9; // jmp
+    *((intptr_t*)(aFn - 4)) = aHookDest - (uintptr_t)(aFn); // target displacement
+
+    // Set aOrigFunc here, because after this point, aHookDest might be called,
+    // and aHookDest might use the aOrigFunc pointer.
+    *aOrigFunc = aFn + 2;
+
+    // Short jump up into our long jump.
+    *((uint16_t*)(aFn)) = 0xf9eb; // jmp $-5
+
+    // I think this routine is safe without this, but it can't hurt.
+    FlushInstructionCache(GetCurrentProcess(),
+                          /* ignored */ nullptr,
+                          /* ignored */ 0);
+
+    return true;
+  }
+
+private:
+  static byteptr_t ResolveRedirectedAddress(const byteptr_t aOriginalFunction)
+  {
+    // If function entry is jmp [disp32] such as used by kernel32,
+    // we resolve redirected address from import table.
+    if (aOriginalFunction[0] == 0xff && aOriginalFunction[1] == 0x25) {
+      return (byteptr_t)(**((uint32_t**) (aOriginalFunction + 2)));
+    }
+
+    return aOriginalFunction;
+  }
+#else
+  void Init(const char* aModuleName)
+  {
+    // Not implemented except on x86-32.
+  }
+
+  bool AddHook(const char* aName, intptr_t aHookDest, void** aOrigFunc)
+  {
+    // Not implemented except on x86-32.
+    return false;
+  }
+#endif
+};
+
+class WindowsDllDetourPatcher
+{
+  typedef unsigned char* byteptr_t;
+public:
+  WindowsDllDetourPatcher()
+    : mModule(0), mHookPage(0), mMaxHooks(0), mCurHooks(0)
+  {
+  }
+
+  ~WindowsDllDetourPatcher()
+  {
+    int i;
+    byteptr_t p;
+    for (i = 0, p = mHookPage; i < mCurHooks; i++, p += kHookSize) {
+#if defined(_M_IX86)
+      size_t nBytes = 1 + sizeof(intptr_t);
+#elif defined(_M_X64)
+      size_t nBytes = 2 + sizeof(intptr_t);
+#else
+#error "Unknown processor type"
+#endif
+      byteptr_t origBytes = (byteptr_t)DecodePointer(*((byteptr_t*)p));
+
+      // ensure we can modify the original code
+      AutoVirtualProtect protect(origBytes, nBytes, PAGE_EXECUTE_READWRITE);
+      if (!protect.Protect()) {
+        continue;
+      }
+
+      // Remove the hook by making the original function jump directly
+      // in the trampoline.
+      intptr_t dest = (intptr_t)(p + sizeof(void*));
+#if defined(_M_IX86)
+      // Ensure the JMP from CreateTrampoline is where we expect it to be.
+      if (origBytes[0] != 0xE9)
+        continue;
+      *((intptr_t*)(origBytes + 1)) =
+        dest - (intptr_t)(origBytes + 5); // target displacement
+#elif defined(_M_X64)
+      // Ensure the MOV R11 from CreateTrampoline is where we expect it to be.
+      if (origBytes[0] != 0x49 || origBytes[1] != 0xBB)
+        continue;
+      *((intptr_t*)(origBytes + 2)) = dest;
+#else
+#error "Unknown processor type"
+#endif
+    }
+  }
+
+  void Init(const char* aModuleName, int aNumHooks = 0)
+  {
+    if (mModule) {
+      return;
+    }
+
+    mModule = LoadLibraryExA(aModuleName, nullptr, 0);
+    if (!mModule) {
+      //printf("LoadLibraryEx for '%s' failed\n", aModuleName);
+      return;
+    }
+
+    int hooksPerPage = 4096 / kHookSize;
+    if (aNumHooks == 0) {
+      aNumHooks = hooksPerPage;
+    }
+
+    mMaxHooks = aNumHooks + (hooksPerPage % aNumHooks);
+
+    mHookPage = (byteptr_t)VirtualAllocEx(GetCurrentProcess(), nullptr,
+                                          mMaxHooks * kHookSize,
+                                          MEM_COMMIT | MEM_RESERVE,
+                                          PAGE_EXECUTE_READ);
+    if (!mHookPage) {
+      mModule = 0;
+      return;
+    }
+  }
+
+  bool Initialized() { return !!mModule; }
+
+  bool AddHook(const char* aName, intptr_t aHookDest, void** aOrigFunc)
+  {
+    if (!mModule) {
+      return false;
+    }
+
+    void* pAddr = (void*)GetProcAddress(mModule, aName);
+    if (!pAddr) {
+      //printf ("GetProcAddress failed\n");
+      return false;
+    }
+
+    pAddr = ResolveRedirectedAddress((byteptr_t)pAddr);
+
+    CreateTrampoline(pAddr, aHookDest, aOrigFunc);
+    if (!*aOrigFunc) {
+      //printf ("CreateTrampoline failed\n");
+      return false;
+    }
+
+    return true;
+  }
+
+protected:
+  const static int kPageSize = 4096;
+  const static int kHookSize = 128;
+
+  HMODULE mModule;
+  byteptr_t mHookPage;
+  int mMaxHooks;
+  int mCurHooks;
+
+  // rex bits
+  static const BYTE kMaskHighNibble = 0xF0;
+  static const BYTE kRexOpcode = 0x40;
+  static const BYTE kMaskRexW = 0x08;
+  static const BYTE kMaskRexR = 0x04;
+  static const BYTE kMaskRexX = 0x02;
+  static const BYTE kMaskRexB = 0x01;
+
+  // mod r/m bits
+  static const BYTE kRegFieldShift = 3;
+  static const BYTE kMaskMod = 0xC0;
+  static const BYTE kMaskReg = 0x38;
+  static const BYTE kMaskRm = 0x07;
+  static const BYTE kRmNeedSib = 0x04;
+  static const BYTE kModReg = 0xC0;
+  static const BYTE kModDisp32 = 0x80;
+  static const BYTE kModDisp8 = 0x40;
+  static const BYTE kModNoRegDisp = 0x00;
+  static const BYTE kRmNoRegDispDisp32 = 0x05;
+
+  // sib bits
+  static const BYTE kMaskSibScale = 0xC0;
+  static const BYTE kMaskSibIndex = 0x38;
+  static const BYTE kMaskSibBase = 0x07;
+  static const BYTE kSibBaseEbp = 0x05;
+
+  int CountModRmSib(const BYTE *aModRm, BYTE* aSubOpcode = nullptr)
+  {
+    if (!aModRm) {
+      return -1;
+    }
+    int numBytes = 1; // Start with 1 for mod r/m byte itself
+    switch (*aModRm & kMaskMod) {
+      case kModReg:
+        return numBytes;
+      case kModDisp8:
+        numBytes += 1;
+        break;
+      case kModDisp32:
+        numBytes += 4;
+        break;
+      case kModNoRegDisp:
+        if ((*aModRm & kMaskRm) == kRmNoRegDispDisp32) {
+#if defined(_M_X64)
+          // RIP-relative on AMD64, currently unsupported
+          return -1;
+#else
+          // On IA-32, all ModR/M instruction modes address memory relative to 0
+          numBytes += 4;
+#endif
+        } else if (((*aModRm & kMaskRm) == kRmNeedSib &&
+             (*(aModRm + 1) & kMaskSibBase) == kSibBaseEbp)) {
+          numBytes += 4;
+        }
+        break;
+      default:
+        // This should not be reachable
+        MOZ_ASSERT_UNREACHABLE("Impossible value for modr/m byte mod bits");
+        return -1;
+    }
+    if ((*aModRm & kMaskRm) == kRmNeedSib) {
+      // SIB byte
+      numBytes += 1;
+    }
+    if (aSubOpcode) {
+      *aSubOpcode = (*aModRm & kMaskReg) >> kRegFieldShift;
+    }
+    return numBytes;
+  }
+
+#if defined(_M_X64)
+  // To patch for JMP and JE
+
+  enum JumpType {
+   Je,
+   Jmp
+  };
+
+  struct JumpPatch {
+    JumpPatch()
+      : mHookOffset(0), mJumpAddress(0), mType(JumpType::Jmp)
+    {
+    }
+
+    JumpPatch(size_t aOffset, intptr_t aAddress, JumpType aType = JumpType::Jmp)
+      : mHookOffset(aOffset), mJumpAddress(aAddress), mType(aType)
+    {
+    }
+
+    void AddJumpPatch(size_t aHookOffset, intptr_t aAbsJumpAddress,
+                     JumpType aType = JumpType::Jmp)
+    {
+      mHookOffset = aHookOffset;
+      mJumpAddress = aAbsJumpAddress;
+      mType = aType;
+    }
+
+    size_t GenerateJump(uint8_t* aCode)
+    {
+      size_t offset = mHookOffset;
+      if (mType == JumpType::Je) {
+        // JNE RIP+14
+        aCode[offset]     = 0x75;
+        aCode[offset + 1] = 14;
+        offset += 2;
+      }
+
+      // JMP [RIP+0]
+      aCode[offset] = 0xff;
+      aCode[offset + 1] = 0x25;
+      *reinterpret_cast<int32_t*>(aCode + offset + 2) = 0;
+
+      // Jump table
+      *reinterpret_cast<int64_t*>(aCode + offset + 2 + 4) = mJumpAddress;
+
+      return offset + 2 + 4 + 8;
+    }
+
+    bool HasJumpPatch() const
+    {
+      return !!mJumpAddress;
+    }
+
+    size_t mHookOffset;
+    intptr_t mJumpAddress;
+    JumpType mType;
+  };
+
+#endif
+
+  enum ePrefixGroupBits
+  {
+    eNoPrefixes = 0,
+    ePrefixGroup1 = (1 << 0),
+    ePrefixGroup2 = (1 << 1),
+    ePrefixGroup3 = (1 << 2),
+    ePrefixGroup4 = (1 << 3)
+  };
+
+  int CountPrefixBytes(byteptr_t aBytes, const int aBytesIndex,
+                       unsigned char* aOutGroupBits)
+  {
+    unsigned char& groupBits = *aOutGroupBits;
+    groupBits = eNoPrefixes;
+    int index = aBytesIndex;
+    while (true) {
+      switch (aBytes[index]) {
+        // Group 1
+        case 0xF0: // LOCK
+        case 0xF2: // REPNZ
+        case 0xF3: // REP / REPZ
+          if (groupBits & ePrefixGroup1) {
+            return -1;
+          }
+          groupBits |= ePrefixGroup1;
+          ++index;
+          break;
+
+        // Group 2
+        case 0x2E: // CS override / branch not taken
+        case 0x36: // SS override
+        case 0x3E: // DS override / branch taken
+        case 0x64: // FS override
+        case 0x65: // GS override
+          if (groupBits & ePrefixGroup2) {
+            return -1;
+          }
+          groupBits |= ePrefixGroup2;
+          ++index;
+          break;
+
+        // Group 3
+        case 0x66: // operand size override
+          if (groupBits & ePrefixGroup3) {
+            return -1;
+          }
+          groupBits |= ePrefixGroup3;
+          ++index;
+          break;
+
+        // Group 4
+        case 0x67: // Address size override
+          if (groupBits & ePrefixGroup4) {
+            return -1;
+          }
+          groupBits |= ePrefixGroup4;
+          ++index;
+          break;
+
+        default:
+          return index - aBytesIndex;
+      }
+    }
+  }
+
+  void CreateTrampoline(void* aOrigFunction, intptr_t aDest, void** aOutTramp)
+  {
+    *aOutTramp = nullptr;
+
+    AutoVirtualProtect protectHookPage(mHookPage, mMaxHooks * kHookSize,
+                                       PAGE_EXECUTE_READWRITE);
+    if (!protectHookPage.Protect()) {
+      return;
+    }
+
+    byteptr_t tramp = FindTrampolineSpace();
+    if (!tramp) {
+      return;
+    }
+
+    byteptr_t origBytes = (byteptr_t)aOrigFunction;
+
+    int nBytes = 0;
+
+#if defined(_M_IX86)
+    int pJmp32 = -1;
+    while (nBytes < 5) {
+      // Understand some simple instructions that might be found in a
+      // prologue; we might need to extend this as necessary.
+      //
+      // Note!  If we ever need to understand jump instructions, we'll
+      // need to rewrite the displacement argument.
+      unsigned char prefixGroups;
+      int numPrefixBytes = CountPrefixBytes(origBytes, nBytes, &prefixGroups);
+      if (numPrefixBytes < 0 || (prefixGroups & (ePrefixGroup3 | ePrefixGroup4))) {
+        // Either the prefix sequence was bad, or there are prefixes that
+        // we don't currently support (groups 3 and 4)
+        return;
+      }
+      nBytes += numPrefixBytes;
+      if (origBytes[nBytes] >= 0x88 && origBytes[nBytes] <= 0x8B) {
+        // various MOVs
+        ++nBytes;
+        int len = CountModRmSib(origBytes + nBytes);
+        if (len < 0) {
+          return;
+        }
+        nBytes += len;
+      } else if (origBytes[nBytes] == 0xA1) {
+        // MOV eax, [seg:offset]
+        nBytes += 5;
+      } else if (origBytes[nBytes] == 0xB8) {
+        // MOV 0xB8: http://ref.x86asm.net/coder32.html#xB8
+        nBytes += 5;
+      } else if (origBytes[nBytes] == 0x83) {
+        // ADD|ODR|ADC|SBB|AND|SUB|XOR|CMP r/m, imm8
+        unsigned char b = origBytes[nBytes + 1];
+        if ((b & 0xc0) == 0xc0) {
+          // ADD|ODR|ADC|SBB|AND|SUB|XOR|CMP r, imm8
+          nBytes += 3;
+        } else {
+          // bail
+          return;
+        }
+      } else if (origBytes[nBytes] == 0x68) {
+        // PUSH with 4-byte operand
+        nBytes += 5;
+      } else if ((origBytes[nBytes] & 0xf0) == 0x50) {
+        // 1-byte PUSH/POP
+        nBytes++;
+      } else if (origBytes[nBytes] == 0x6A) {
+        // PUSH imm8
+        nBytes += 2;
+      } else if (origBytes[nBytes] == 0xe9) {
+        pJmp32 = nBytes;
+        // jmp 32bit offset
+        nBytes += 5;
+      } else if (origBytes[nBytes] == 0xff && origBytes[nBytes + 1] == 0x25) {
+        // jmp [disp32]
+        nBytes += 6;
+      } else {
+        //printf ("Unknown x86 instruction byte 0x%02x, aborting trampoline\n", origBytes[nBytes]);
+        return;
+      }
+    }
+#elif defined(_M_X64)
+    JumpPatch jump;
+
+    while (nBytes < 13) {
+
+      // if found JMP 32bit offset, next bytes must be NOP or INT3
+      if (jump.HasJumpPatch()) {
+        if (origBytes[nBytes] == 0x90 || origBytes[nBytes] == 0xcc) {
+          nBytes++;
+          continue;
+        }
+        return;
+      }
+      if (origBytes[nBytes] == 0x0f) {
+        nBytes++;
+        if (origBytes[nBytes] == 0x1f) {
+          // nop (multibyte)
+          nBytes++;
+          if ((origBytes[nBytes] & 0xc0) == 0x40 &&
+              (origBytes[nBytes] & 0x7) == 0x04) {
+            nBytes += 3;
+          } else {
+            return;
+          }
+        } else if (origBytes[nBytes] == 0x05) {
+          // syscall
+          nBytes++;
+        } else if (origBytes[nBytes] == 0x84) {
+          // je rel32
+          jump.AddJumpPatch(nBytes - 1,
+                            (intptr_t)
+                              origBytes + nBytes + 5 +
+                            *(reinterpret_cast<int32_t*>(origBytes +
+                                                         nBytes + 1)),
+                            JumpType::Je);
+          nBytes += 5;
+        } else {
+          return;
+        }
+      } else if (origBytes[nBytes] == 0x40 ||
+                 origBytes[nBytes] == 0x41) {
+        // Plain REX or REX.B
+        nBytes++;
+
+        if ((origBytes[nBytes] & 0xf0) == 0x50) {
+          // push/pop with Rx register
+          nBytes++;
+        } else if (origBytes[nBytes] >= 0xb8 && origBytes[nBytes] <= 0xbf) {
+          // mov r32, imm32
+          nBytes += 5;
+        } else {
+          return;
+        }
+      } else if (origBytes[nBytes] == 0x45) {
+        // REX.R & REX.B
+        nBytes++;
+
+        if (origBytes[nBytes] == 0x33) {
+          // xor r32, r32
+          nBytes += 2;
+        } else {
+          return;
+        }
+      } else if ((origBytes[nBytes] & 0xfb) == 0x48) {
+        // REX.W | REX.WR
+        nBytes++;
+
+        if (origBytes[nBytes] == 0x81 &&
+            (origBytes[nBytes + 1] & 0xf8) == 0xe8) {
+          // sub r, dword
+          nBytes += 6;
+        } else if (origBytes[nBytes] == 0x83 &&
+                   (origBytes[nBytes + 1] & 0xf8) == 0xe8) {
+          // sub r, byte
+          nBytes += 3;
+        } else if (origBytes[nBytes] == 0x83 &&
+                   (origBytes[nBytes + 1] & 0xf8) == 0x60) {
+          // and [r+d], imm8
+          nBytes += 5;
+        } else if (origBytes[nBytes] == 0x85) {
+          // 85 /r => TEST r/m32, r32
+          if ((origBytes[nBytes + 1] & 0xc0) == 0xc0) {
+            nBytes += 2;
+          } else {
+            return;
+          }
+        } else if ((origBytes[nBytes] & 0xfd) == 0x89) {
+          ++nBytes;
+          // MOV r/m64, r64 | MOV r64, r/m64
+          int len = CountModRmSib(origBytes + nBytes);
+          if (len < 0) {
+            return;
+          }
+          nBytes += len;
+        } else if (origBytes[nBytes] == 0xc7) {
+          // MOV r/m64, imm32
+          if (origBytes[nBytes + 1] == 0x44) {
+            // MOV [r64+disp8], imm32
+            // ModR/W + SIB + disp8 + imm32
+            nBytes += 8;
+          } else {
+            return;
+          }
+        } else if (origBytes[nBytes] == 0xff) {
+          // JMP /4
+          if ((origBytes[nBytes + 1] & 0xc0) == 0x0 &&
+              (origBytes[nBytes + 1] & 0x07) == 0x5) {
+            // [rip+disp32]
+            // convert JMP 32bit offset to JMP 64bit direct
+            jump.AddJumpPatch(nBytes - 1,
+                              *reinterpret_cast<intptr_t*>(
+                                origBytes + nBytes + 6 +
+                              *reinterpret_cast<int32_t*>(origBytes + nBytes +
+                                                          2)));
+            nBytes += 6;
+          } else {
+            // not support yet!
+            return;
+          }
+        } else {
+          // not support yet!
+          return;
+        }
+      } else if (origBytes[nBytes] == 0x66) {
+        // operand override prefix
+        nBytes += 1;
+        // This is the same as the x86 version
+        if (origBytes[nBytes] >= 0x88 && origBytes[nBytes] <= 0x8B) {
+          // various MOVs
+          unsigned char b = origBytes[nBytes + 1];
+          if (((b & 0xc0) == 0xc0) ||
+              (((b & 0xc0) == 0x00) &&
+               ((b & 0x07) != 0x04) && ((b & 0x07) != 0x05))) {
+            // REG=r, R/M=r or REG=r, R/M=[r]
+            nBytes += 2;
+          } else if ((b & 0xc0) == 0x40) {
+            if ((b & 0x07) == 0x04) {
+              // REG=r, R/M=[SIB + disp8]
+              nBytes += 4;
+            } else {
+              // REG=r, R/M=[r + disp8]
+              nBytes += 3;
+            }
+          } else {
+            // complex MOV, bail
+            return;
+          }
+        }
+      } else if ((origBytes[nBytes] & 0xf0) == 0x50) {
+        // 1-byte push/pop
+        nBytes++;
+      } else if (origBytes[nBytes] == 0x65) {
+        // GS prefix
+        //
+        // The entry of GetKeyState on Windows 10 has the following code.
+        // 65 48 8b 04 25 30 00 00 00    mov   rax,qword ptr gs:[30h]
+        // (GS prefix + REX + MOV (0x8b) ...)
+        if (origBytes[nBytes + 1] == 0x48 &&
+            (origBytes[nBytes + 2] >= 0x88 && origBytes[nBytes + 2] <= 0x8b)) {
+          nBytes += 3;
+          int len = CountModRmSib(origBytes + nBytes);
+          if (len < 0) {
+            // no way to support this yet.
+            return;
+          }
+          nBytes += len;
+        } else {
+          return;
+        }
+      } else if (origBytes[nBytes] == 0x90) {
+        // nop
+        nBytes++;
+      } else if (origBytes[nBytes] == 0xb8) {
+        // MOV 0xB8: http://ref.x86asm.net/coder32.html#xB8
+        nBytes += 5;
+      } else if (origBytes[nBytes] == 0x33) {
+        // xor r32, r/m32
+        nBytes += 2;
+      } else if (origBytes[nBytes] == 0xf6) {
+        // test r/m8, imm8 (used by ntdll on Windows 10 x64)
+        // (no flags are affected by near jmp since there is no task switch,
+        // so it is ok for a jmp to be written immediately after a test)
+        BYTE subOpcode = 0;
+        int nModRmSibBytes = CountModRmSib(&origBytes[nBytes + 1], &subOpcode);
+        if (nModRmSibBytes < 0 || subOpcode != 0) {
+          // Unsupported
+          return;
+        }
+        nBytes += 2 + nModRmSibBytes;
+      } else if (origBytes[nBytes] == 0xc3) {
+        // ret
+        nBytes++;
+      } else if (origBytes[nBytes] == 0xcc) {
+        // int 3
+        nBytes++;
+      } else if (origBytes[nBytes] == 0xe9) {
+        // jmp 32bit offset
+        jump.AddJumpPatch(nBytes,
+                          // convert JMP 32bit offset to JMP 64bit direct
+                          (intptr_t)
+                            origBytes + nBytes + 5 +
+                          *(reinterpret_cast<int32_t*>(origBytes + nBytes + 1)));
+        nBytes += 5;
+      } else if (origBytes[nBytes] == 0xff) {
+        nBytes++;
+        if ((origBytes[nBytes] & 0xf8) == 0xf0) {
+          // push r64
+          nBytes++;
+        } else {
+          return;
+        }
+      } else {
+        return;
+      }
+    }
+#else
+#error "Unknown processor type"
+#endif
+
+    if (nBytes > 100) {
+      //printf ("Too big!");
+      return;
+    }
+
+    // We keep the address of the original function in the first bytes of
+    // the trampoline buffer
+    *((void**)tramp) = EncodePointer(aOrigFunction);
+    tramp += sizeof(void*);
+
+    memcpy(tramp, aOrigFunction, nBytes);
+
+    // OrigFunction+N, the target of the trampoline
+    byteptr_t trampDest = origBytes + nBytes;
+
+#if defined(_M_IX86)
+    if (pJmp32 >= 0) {
+      // Jump directly to the original target of the jump instead of jumping to the
+      // original function.
+      // Adjust jump target displacement to jump location in the trampoline.
+      *((intptr_t*)(tramp + pJmp32 + 1)) += origBytes - tramp;
+    } else {
+      tramp[nBytes] = 0xE9; // jmp
+      *((intptr_t*)(tramp + nBytes + 1)) =
+        (intptr_t)trampDest - (intptr_t)(tramp + nBytes + 5); // target displacement
+    }
+#elif defined(_M_X64)
+    // If JMP/JE opcode found, we don't insert to trampoline jump
+    if (jump.HasJumpPatch()) {
+      size_t offset = jump.GenerateJump(tramp);
+      if (jump.mType != JumpType::Jmp) {
+        JumpPatch patch(offset, reinterpret_cast<intptr_t>(trampDest));
+        patch.GenerateJump(tramp);
+      }
+    } else {
+      JumpPatch patch(nBytes, reinterpret_cast<intptr_t>(trampDest));
+      patch.GenerateJump(tramp);
+    }
+#endif
+
+    // The trampoline is now valid.
+    *aOutTramp = tramp;
+
+    // ensure we can modify the original code
+    AutoVirtualProtect protect(aOrigFunction, nBytes, PAGE_EXECUTE_READWRITE);
+    if (!protect.Protect()) {
+      return;
+    }
+
+#if defined(_M_IX86)
+    // now modify the original bytes
+    origBytes[0] = 0xE9; // jmp
+    *((intptr_t*)(origBytes + 1)) =
+      aDest - (intptr_t)(origBytes + 5); // target displacement
+#elif defined(_M_X64)
+    // mov r11, address
+    origBytes[0] = 0x49;
+    origBytes[1] = 0xbb;
+
+    *((intptr_t*)(origBytes + 2)) = aDest;
+
+    // jmp r11
+    origBytes[10] = 0x41;
+    origBytes[11] = 0xff;
+    origBytes[12] = 0xe3;
+#endif
+  }
+
+  byteptr_t FindTrampolineSpace()
+  {
+    if (mCurHooks >= mMaxHooks) {
+      return 0;
+    }
+
+    byteptr_t p = mHookPage + mCurHooks * kHookSize;
+
+    mCurHooks++;
+
+    return p;
+  }
+
+  static void* ResolveRedirectedAddress(const byteptr_t aOriginalFunction)
+  {
+#if defined(_M_IX86)
+    // If function entry is jmp [disp32] such as used by kernel32,
+    // we resolve redirected address from import table.
+    if (aOriginalFunction[0] == 0xff && aOriginalFunction[1] == 0x25) {
+      return (void*)(**((uint32_t**) (aOriginalFunction + 2)));
+    }
+#elif defined(_M_X64)
+    if (aOriginalFunction[0] == 0xe9) {
+      // require for TestDllInterceptor with --disable-optimize
+      int32_t offset = *((int32_t*)(aOriginalFunction + 1));
+      return aOriginalFunction + 5 + offset;
+    }
+#endif
+
+    return aOriginalFunction;
+  }
+};
+
+} // namespace internal
+
+class WindowsDllInterceptor
+{
+  internal::WindowsDllNopSpacePatcher mNopSpacePatcher;
+  internal::WindowsDllDetourPatcher mDetourPatcher;
+
+  const char* mModuleName;
+  int mNHooks;
+
+public:
+  WindowsDllInterceptor()
+    : mModuleName(nullptr)
+    , mNHooks(0)
+  {}
+
+  void Init(const char* aModuleName, int aNumHooks = 0)
+  {
+    if (mModuleName) {
+      return;
+    }
+
+    mModuleName = aModuleName;
+    mNHooks = aNumHooks;
+    mNopSpacePatcher.Init(aModuleName);
+
+    // Lazily initialize mDetourPatcher, since it allocates memory and we might
+    // not need it.
+  }
+
+  bool AddHook(const char* aName, intptr_t aHookDest, void** aOrigFunc)
+  {
+    // Use a nop space patch if possible, otherwise fall back to a detour.
+    // This should be the preferred method for adding hooks.
+
+    if (!mModuleName) {
+      return false;
+    }
+
+    if (mNopSpacePatcher.AddHook(aName, aHookDest, aOrigFunc)) {
+      return true;
+    }
+
+    return AddDetour(aName, aHookDest, aOrigFunc);
+  }
+
+  bool AddDetour(const char* aName, intptr_t aHookDest, void** aOrigFunc)
+  {
+    // Generally, code should not call this method directly. Use AddHook unless
+    // there is a specific need to avoid nop space patches.
+
+    if (!mModuleName) {
+      return false;
+    }
+
+    if (!mDetourPatcher.Initialized()) {
+      mDetourPatcher.Init(mModuleName, mNHooks);
+    }
+
+    return mDetourPatcher.AddHook(aName, aHookDest, aOrigFunc);
+  }
+};
+
+} // namespace mozilla
+
+#endif /* NS_WINDOWS_DLL_INTERCEPTOR_H_ */
diff --git a/xpcom/build/nsXPCOM.h b/xpcom/build/nsXPCOM.h
new file mode 100644
index 0000000000..925ca6901a
--- /dev/null
+++ b/xpcom/build/nsXPCOM.h
@@ -0,0 +1,433 @@
+/* -*- 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/. */
+
+#ifndef nsXPCOM_h__
+#define nsXPCOM_h__
+
+#include "nscore.h"
+#include "nsXPCOMCID.h"
+
+#ifdef __cplusplus
+#define DECL_CLASS(c) class c
+#define DECL_STRUCT(c) struct c
+#else
+#define DECL_CLASS(c) typedef struct c c
+#define DECL_STRUCT(c) typedef struct c c
+#endif
+
+DECL_CLASS(nsAString);
+DECL_CLASS(nsACString);
+
+DECL_CLASS(nsISupports);
+DECL_CLASS(nsIModule);
+DECL_CLASS(nsIComponentManager);
+DECL_CLASS(nsIComponentRegistrar);
+DECL_CLASS(nsIServiceManager);
+DECL_CLASS(nsIFile);
+DECL_CLASS(nsILocalFile);
+DECL_CLASS(nsIDirectoryServiceProvider);
+DECL_CLASS(nsIMemory);
+DECL_CLASS(nsIDebug2);
+
+#ifdef __cplusplus
+namespace mozilla {
+struct Module;
+} // namespace mozilla
+#endif
+
+/**
+ * Initialises XPCOM. You must call one of the NS_InitXPCOM methods
+ * before proceeding to use xpcom. The one exception is that you may
+ * call NS_NewLocalFile to create a nsIFile.
+ *
+ * @note Use <CODE>NS_NewLocalFile</CODE> or <CODE>NS_NewNativeLocalFile</CODE>
+ *       to create the file object you supply as the bin directory path in this
+ *       call. The function may be safely called before the rest of XPCOM or
+ *       embedding has been initialised.
+ *
+ * @param aResult          The service manager.  You may pass null.
+ *
+ * @param aBinDirectory    The directory containing the component
+ *                         registry and runtime libraries;
+ *                         or use <CODE>nullptr</CODE> to use the working
+ *                         directory.
+ *
+ * @param aAppFileLocationProvider The object to be used by Gecko that
+ *                         specifies to Gecko where to find profiles, the
+ *                         component registry preferences and so on; or use
+ *                         <CODE>nullptr</CODE> for the default behaviour.
+ *
+ * @see NS_NewLocalFile
+ * @see nsIFile
+ * @see nsIDirectoryServiceProvider
+ *
+ * @return NS_OK for success;
+ *         NS_ERROR_NOT_INITIALIZED if static globals were not initialized,
+ *         which can happen if XPCOM is reloaded, but did not completly
+ *         shutdown. Other error codes indicate a failure during
+ *         initialisation.
+ */
+XPCOM_API(nsresult)
+NS_InitXPCOM2(nsIServiceManager** aResult,
+              nsIFile* aBinDirectory,
+              nsIDirectoryServiceProvider* aAppFileLocationProvider);
+
+/**
+ * Initialize only minimal components of XPCOM. This ensures nsThreadManager,
+ * logging, and timers will work.
+ */
+XPCOM_API(nsresult)
+NS_InitMinimalXPCOM();
+
+/**
+ * Shutdown XPCOM. You must call this method after you are finished
+ * using xpcom.
+ *
+ * @param aServMgr          The service manager which was returned by NS_InitXPCOM.
+ *                          This will release servMgr.  You may pass null.
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_ShutdownXPCOM(nsIServiceManager* aServMgr);
+
+
+/**
+ * Public Method to access to the service manager.
+ *
+ * @param aResult Interface pointer to the service manager
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetServiceManager(nsIServiceManager** aResult);
+
+/**
+ * Public Method to access to the component manager.
+ *
+ * @param aResult Interface pointer to the service
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetComponentManager(nsIComponentManager** aResult);
+
+
+/**
+ * Public Method to access to the component registration manager.
+ *
+ * @param aResult Interface pointer to the service
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetComponentRegistrar(nsIComponentRegistrar** aResult);
+
+/**
+ * Public Method to access to the memory manager.  See nsIMemory
+ *
+ * @param aResult Interface pointer to the memory manager
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during initialisation.
+ */
+XPCOM_API(nsresult) NS_GetMemoryManager(nsIMemory** aResult);
+
+/**
+ * Public Method to create an instance of a nsIFile.  This function
+ * may be called prior to NS_InitXPCOM.
+ *
+ *   @param aPath
+ *       A string which specifies a full file path to a
+ *       location.  Relative paths will be treated as an
+ *       error (NS_ERROR_FILE_UNRECOGNIZED_PATH).
+ *       |NS_NewNativeLocalFile|'s path must be in the
+ *       filesystem charset.
+ *   @param aFollowLinks
+ *       This attribute will determine if the nsLocalFile will auto
+ *       resolve symbolic links.  By default, this value will be false
+ *       on all non unix systems.  On unix, this attribute is effectively
+ *       a noop.
+ * @param aResult Interface pointer to a new instance of an nsIFile
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure.
+ */
+
+#ifdef __cplusplus
+
+XPCOM_API(nsresult) NS_NewLocalFile(const nsAString& aPath,
+                                    bool aFollowLinks,
+                                    nsIFile** aResult);
+
+XPCOM_API(nsresult) NS_NewNativeLocalFile(const nsACString& aPath,
+                                          bool aFollowLinks,
+                                          nsIFile** aResult);
+
+#endif
+
+/**
+ * Allocator functions for the standalone glue.
+ * Do not use outside the xpcom glue code.
+ * Use moz_xmalloc/moz_xrealloc/free, or new/delete instead.
+ */
+#ifdef XPCOM_GLUE
+/**
+ * Allocates a block of memory of a particular size. If the memory cannot
+ * be allocated (because of an out-of-memory condition), the process aborts.
+ *
+ * @param aSize  The size of the block to allocate
+ * @result       The block of memory
+ * @note         This function is thread-safe.
+ */
+XPCOM_API(void*) NS_Alloc(size_t aSize);
+
+/**
+ * Reallocates a block of memory to a new size.
+ *
+ * @param aPtr    The block of memory to reallocate. This block must originally
+                  have been allocated by NS_Alloc or NS_Realloc
+ * @param aSize   The new size. If 0, frees the block like NS_Free
+ * @result        The reallocated block of memory
+ * @note          This function is thread-safe.
+ *
+ * If aPtr is null, this function behaves like NS_Alloc.
+ * If s is the size of the block to which aPtr points, the first min(s, size)
+ * bytes of aPtr's block are copied to the new block. If the allocation
+ * succeeds, aPtr is freed and a pointer to the new block is returned. If the
+ * allocation fails, the process aborts.
+ */
+XPCOM_API(void*) NS_Realloc(void* aPtr, size_t aSize);
+
+/**
+ * Frees a block of memory. Null is a permissible value, in which case no
+ * action is taken.
+ *
+ * @param aPtr  The block of memory to free. This block must originally have
+ *              been allocated by NS_Alloc or NS_Realloc
+ * @note        This function is thread-safe.
+ */
+XPCOM_API(void) NS_Free(void* aPtr);
+#else
+#define NS_Alloc moz_xmalloc
+#define NS_Realloc moz_xrealloc
+#define NS_Free free
+#endif
+
+/**
+ * Support for warnings, assertions, and debugging breaks.
+ */
+
+enum
+{
+  NS_DEBUG_WARNING = 0,
+  NS_DEBUG_ASSERTION = 1,
+  NS_DEBUG_BREAK = 2,
+  NS_DEBUG_ABORT = 3
+};
+
+/**
+ * Print a runtime assertion. This function is available in both debug and
+ * release builds.
+ *
+ * @note Based on the value of aSeverity and the XPCOM_DEBUG_BREAK
+ * environment variable, this function may cause the application to
+ * print the warning, print a stacktrace, break into a debugger, or abort
+ * immediately.
+ *
+ * @param aSeverity A NS_DEBUG_* value
+ * @param aStr   A readable error message (ASCII, may be null)
+ * @param aExpr  The expression evaluated (may be null)
+ * @param aFile  The source file containing the assertion (may be null)
+ * @param aLine  The source file line number (-1 indicates no line number)
+ */
+XPCOM_API(void) NS_DebugBreak(uint32_t aSeverity,
+                              const char* aStr, const char* aExpr,
+                              const char* aFile, int32_t aLine);
+
+/**
+ * Perform a stack-walk to a debugging log under various
+ * circumstances. Used to aid debugging of leaked object graphs.
+ *
+ * The NS_Log* functions are available in both debug and release
+ * builds of XPCOM, but the output will be useless unless binary
+ * debugging symbols for all modules in the stacktrace are available.
+ */
+
+/**
+ * By default, refcount logging is enabled at NS_InitXPCOM and
+ * refcount statistics are printed at NS_ShutdownXPCOM. NS_LogInit and
+ * NS_LogTerm allow applications to enable logging earlier and delay
+ * printing of logging statistics. They should always be used as a
+ * matched pair.
+ */
+XPCOM_API(void) NS_LogInit();
+
+XPCOM_API(void) NS_LogTerm();
+
+#ifdef __cplusplus
+/**
+ * A helper class that calls NS_LogInit in its constructor and
+ * NS_LogTerm in its destructor.
+ */
+
+class ScopedLogging
+{
+public:
+    ScopedLogging()
+    {
+        NS_LogInit();
+    }
+
+    ~ScopedLogging()
+    {
+        NS_LogTerm();
+    }
+};
+#endif
+
+/**
+ * Log construction and destruction of objects. Processing tools can use the
+ * stacktraces printed by these functions to identify objects that are being
+ * leaked.
+ *
+ * @param aPtr          A pointer to the concrete object.
+ * @param aTypeName     The class name of the type
+ * @param aInstanceSize The size of the type
+ */
+
+XPCOM_API(void) NS_LogCtor(void* aPtr, const char* aTypeName,
+                           uint32_t aInstanceSize);
+
+XPCOM_API(void) NS_LogDtor(void* aPtr, const char* aTypeName,
+                           uint32_t aInstanceSize);
+
+/**
+ * Log a stacktrace when an XPCOM object's refcount is incremented or
+ * decremented. Processing tools can use the stacktraces printed by these
+ * functions to identify objects that were leaked due to XPCOM references.
+ *
+ * @param aPtr          A pointer to the concrete object
+ * @param aNewRefCnt    The new reference count.
+ * @param aTypeName     The class name of the type
+ * @param aInstanceSize The size of the type
+ */
+XPCOM_API(void) NS_LogAddRef(void* aPtr, nsrefcnt aNewRefCnt,
+                             const char* aTypeName, uint32_t aInstanceSize);
+
+XPCOM_API(void) NS_LogRelease(void* aPtr, nsrefcnt aNewRefCnt,
+                              const char* aTypeName);
+
+/**
+ * Log reference counting performed by COMPtrs. Processing tools can
+ * use the stacktraces printed by these functions to simplify reports
+ * about leaked objects generated from the data printed by
+ * NS_LogAddRef/NS_LogRelease.
+ *
+ * @param aCOMPtr the address of the COMPtr holding a strong reference
+ * @param aObject the object being referenced by the COMPtr
+ */
+
+XPCOM_API(void) NS_LogCOMPtrAddRef(void* aCOMPtr, nsISupports* aObject);
+
+XPCOM_API(void) NS_LogCOMPtrRelease(void* aCOMPtr, nsISupports* aObject);
+
+/**
+ * The XPCOM cycle collector analyzes and breaks reference cycles between
+ * participating XPCOM objects. All objects in the cycle must implement
+ * nsCycleCollectionParticipant to break cycles correctly.
+ */
+
+#ifdef __cplusplus
+
+class nsCycleCollectionParticipant;
+class nsCycleCollectingAutoRefCnt;
+
+XPCOM_API(void) NS_CycleCollectorSuspect3(void* aPtr,
+                                          nsCycleCollectionParticipant* aCp,
+                                          nsCycleCollectingAutoRefCnt* aRefCnt,
+                                          bool* aShouldDelete);
+
+#endif
+
+/**
+ * Categories (in the category manager service) used by XPCOM:
+ */
+
+/**
+ * A category which is read after component registration but before
+ * the "xpcom-startup" notifications. Each category entry is treated
+ * as the contract ID of a service which implements
+ * nsIDirectoryServiceProvider. Each directory service provider is
+ * installed in the global directory service.
+ */
+#define XPCOM_DIRECTORY_PROVIDER_CATEGORY "xpcom-directory-providers"
+
+/**
+ * A category which is read after component registration but before
+ * NS_InitXPCOM returns. Each category entry is treated as the contractID of
+ * a service: each service is instantiated, and if it implements nsIObserver
+ * the nsIObserver.observe method is called with the "xpcom-startup" topic.
+ */
+#define NS_XPCOM_STARTUP_CATEGORY "xpcom-startup"
+
+
+/**
+ * Observer topics (in the observer service) used by XPCOM:
+ */
+
+/**
+ * At XPCOM startup after component registration is complete, the
+ * following topic is notified. In order to receive this notification,
+ * component must register their contract ID in the category manager,
+ *
+ * @see NS_XPCOM_STARTUP_CATEGORY
+ */
+#define NS_XPCOM_STARTUP_OBSERVER_ID "xpcom-startup"
+
+/**
+ * At XPCOM shutdown, this topic is notified just before "xpcom-shutdown".
+ * Components should only use this to mark themselves as 'being destroyed'.
+ * Nothing should be dispatched to any event loop.
+ */
+#define NS_XPCOM_WILL_SHUTDOWN_OBSERVER_ID "xpcom-will-shutdown"
+
+/**
+ * At XPCOM shutdown, this topic is notified. All components must
+ * release any interface references to objects in other modules when
+ * this topic is notified.
+ */
+#define NS_XPCOM_SHUTDOWN_OBSERVER_ID "xpcom-shutdown"
+
+/**
+ * This topic is notified when an entry was added to a category in the
+ * category manager. The subject of the notification will be the name of
+ * the added entry as an nsISupportsCString, and the data will be the
+ * name of the category. The notification will occur on the main thread.
+ */
+#define NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID \
+  "xpcom-category-entry-added"
+
+/**
+ * This topic is notified when an entry was removed from a category in the
+ * category manager. The subject of the notification will be the name of
+ * the removed entry as an nsISupportsCString, and the data will be the
+ * name of the category. The notification will occur on the main thread.
+ */
+#define NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID \
+  "xpcom-category-entry-removed"
+
+/**
+ * This topic is notified when an a category was cleared in the category
+ * manager. The subject of the notification will be the category manager,
+ * and the data will be the name of the cleared category.
+ * The notification will occur on the main thread.
+ */
+#define NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID "xpcom-category-cleared"
+
+XPCOM_API(nsresult) NS_GetDebug(nsIDebug2** aResult);
+
+#endif
diff --git a/xpcom/build/nsXPCOMCID.h b/xpcom/build/nsXPCOMCID.h
new file mode 100644
index 0000000000..7219babe4e
--- /dev/null
+++ b/xpcom/build/nsXPCOMCID.h
@@ -0,0 +1,185 @@
+/* -*- 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/. */
+
+#ifndef nsXPCOMCID_h__
+#define nsXPCOMCID_h__
+
+/**
+ * XPCOM Directory Service Contract ID
+ *   The directory service provides ways to obtain file system locations. The
+ *   directory service is a singleton.
+ *
+ *   This contract supports the nsIDirectoryService and the nsIProperties
+ *   interfaces.
+ *
+ */
+#define NS_DIRECTORY_SERVICE_CONTRACTID "@mozilla.org/file/directory_service;1"
+
+/**
+ * XPCOM File
+ *   The file abstraction provides ways to obtain and access files and
+ *   directories located on the local system.
+ *
+ *   This contract supports the nsIFile interface.
+ *   This contract may also support platform specific interfaces such as
+ *   nsILocalFileMac on platforms where additional interfaces are required.
+ *
+ */
+#define NS_LOCAL_FILE_CONTRACTID "@mozilla.org/file/local;1"
+
+/**
+ * XPCOM Category Manager Contract ID
+ *   The contract supports the nsICategoryManager interface. The
+ *   category manager is a singleton.
+ * The "enumerateCategory" method of nsICategoryManager will return an object
+ * that implements nsIUTF8StringEnumerator. In addition, the enumerator will
+ * return the entries in sorted order (sorted by byte comparison).
+ */
+#define NS_CATEGORYMANAGER_CONTRACTID   "@mozilla.org/categorymanager;1"
+
+/**
+ * XPCOM Properties Object Contract ID
+ *   Simple mapping object which supports the nsIProperties interface.
+ */
+#define NS_PROPERTIES_CONTRACTID "@mozilla.org/properties;1"
+
+/**
+ * XPCOM Array Object ContractID
+ * Simple array implementation which supports the nsIArray and
+ * nsIMutableArray interfaces.
+ */
+#define NS_ARRAY_CONTRACTID  "@mozilla.org/array;1"
+
+/**
+ * Observer Service ContractID
+ * The observer service implements the global nsIObserverService object.
+ * It should be used from the main thread only.
+ */
+#define NS_OBSERVERSERVICE_CONTRACTID "@mozilla.org/observer-service;1"
+
+/**
+ * IO utilities service contract id.
+ * This guarantees implementation of nsIIOUtil.  Usable from any thread.
+ */
+#define NS_IOUTIL_CONTRACTID "@mozilla.org/io-util;1"
+
+/**
+ * Memory reporter service CID
+ */
+#define NS_MEMORY_REPORTER_MANAGER_CONTRACTID "@mozilla.org/memory-reporter-manager;1"
+
+/**
+ * Memory info dumper service CID
+ */
+#define NS_MEMORY_INFO_DUMPER_CONTRACTID "@mozilla.org/memory-info-dumper;1"
+
+/**
+ * Status reporter service CID
+ */
+#define NS_STATUS_REPORTER_MANAGER_CONTRACTID "@mozilla.org/status-reporter-manager;1"
+
+/**
+ * Cycle collector logger contract id
+ */
+#define NS_CYCLE_COLLECTOR_LOGGER_CONTRACTID "@mozilla.org/cycle-collector-logger;1"
+
+/**
+ * nsMessageLoop contract id
+ */
+#define NS_MESSAGE_LOOP_CONTRACTID "@mozilla.org/message-loop;1"
+
+#define NS_COMPARTMENT_INFO_CONTRACTID "@mozilla.org/compartment-info;1"
+
+/**
+ * The following are the CIDs and Contract IDs of the nsISupports wrappers for
+ * primative types.
+ */
+#define NS_SUPPORTS_ID_CID \
+{ 0xacf8dc40, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_ID_CONTRACTID "@mozilla.org/supports-id;1"
+
+#define NS_SUPPORTS_CSTRING_CID \
+{ 0xacf8dc41, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_CSTRING_CONTRACTID "@mozilla.org/supports-cstring;1"
+
+#define NS_SUPPORTS_STRING_CID \
+{ 0xacf8dc42, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_STRING_CONTRACTID "@mozilla.org/supports-string;1"
+
+#define NS_SUPPORTS_PRBOOL_CID \
+{ 0xacf8dc43, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRBOOL_CONTRACTID "@mozilla.org/supports-PRBool;1"
+
+#define NS_SUPPORTS_PRUINT8_CID \
+{ 0xacf8dc44, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRUINT8_CONTRACTID "@mozilla.org/supports-PRUint8;1"
+
+#define NS_SUPPORTS_PRUINT16_CID \
+{ 0xacf8dc46, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRUINT16_CONTRACTID "@mozilla.org/supports-PRUint16;1"
+
+#define NS_SUPPORTS_PRUINT32_CID \
+{ 0xacf8dc47, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRUINT32_CONTRACTID "@mozilla.org/supports-PRUint32;1"
+
+#define NS_SUPPORTS_PRUINT64_CID \
+{ 0xacf8dc48, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRUINT64_CONTRACTID "@mozilla.org/supports-PRUint64;1"
+
+#define NS_SUPPORTS_PRTIME_CID \
+{ 0xacf8dc49, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRTIME_CONTRACTID "@mozilla.org/supports-PRTime;1"
+
+#define NS_SUPPORTS_CHAR_CID \
+{ 0xacf8dc4a, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_CHAR_CONTRACTID "@mozilla.org/supports-char;1"
+
+#define NS_SUPPORTS_PRINT16_CID \
+{ 0xacf8dc4b, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRINT16_CONTRACTID "@mozilla.org/supports-PRInt16;1"
+
+#define NS_SUPPORTS_PRINT32_CID \
+{ 0xacf8dc4c, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRINT32_CONTRACTID "@mozilla.org/supports-PRInt32;1"
+
+#define NS_SUPPORTS_PRINT64_CID \
+{ 0xacf8dc4d, 0x4a25, 0x11d3, \
+{ 0x98, 0x90, 0x0, 0x60, 0x8, 0x96, 0x24, 0x22 } }
+#define NS_SUPPORTS_PRINT64_CONTRACTID "@mozilla.org/supports-PRInt64;1"
+
+#define NS_SUPPORTS_FLOAT_CID \
+{ 0xcbf86870, 0x4ac0, 0x11d3, \
+{ 0xba, 0xea, 0x0, 0x80, 0x5f, 0x8a, 0x5d, 0xd7 } }
+#define NS_SUPPORTS_FLOAT_CONTRACTID "@mozilla.org/supports-float;1"
+
+#define NS_SUPPORTS_DOUBLE_CID \
+{ 0xcbf86871, 0x4ac0, 0x11d3, \
+{ 0xba, 0xea, 0x0, 0x80, 0x5f, 0x8a, 0x5d, 0xd7 } }
+#define NS_SUPPORTS_DOUBLE_CONTRACTID "@mozilla.org/supports-double;1"
+
+#define NS_SUPPORTS_VOID_CID \
+{ 0xaf10f3e0, 0x568d, 0x11d3, \
+{ 0xba, 0xf8, 0x0, 0x80, 0x5f, 0x8a, 0x5d, 0xd7 } }
+#define NS_SUPPORTS_VOID_CONTRACTID "@mozilla.org/supports-void;1"
+
+#define NS_SUPPORTS_INTERFACE_POINTER_CID \
+{ 0xA99FEBBA, 0x1DD1, 0x11B2, \
+{ 0xA9, 0x43, 0xB0, 0x23, 0x34, 0xA6, 0xD0, 0x83 } }
+#define NS_SUPPORTS_INTERFACE_POINTER_CONTRACTID "@mozilla.org/supports-interface-pointer;1"
+
+#endif
diff --git a/xpcom/build/nsXPCOMCIDInternal.h b/xpcom/build/nsXPCOMCIDInternal.h
new file mode 100644
index 0000000000..c9f7fb6f36
--- /dev/null
+++ b/xpcom/build/nsXPCOMCIDInternal.h
@@ -0,0 +1,54 @@
+/* -*- 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/. */
+
+#ifndef nsXPCOMCIDInternal_h__
+#define nsXPCOMCIDInternal_h__
+
+#include "nsXPCOMCID.h"
+
+/**
+ * A hashtable-based property bag component.
+ * @implements nsIWritablePropertyBag, nsIWritablePropertyBag2
+ */
+#define NS_HASH_PROPERTY_BAG_CID \
+{ 0x678c50b8, 0x6bcb, 0x4ad0, \
+{ 0xb9, 0xb8, 0xc8, 0x11, 0x75, 0x95, 0x51, 0x99 } }
+#define NS_HASH_PROPERTY_BAG_CONTRACTID "@mozilla.org/hash-property-bag;1"
+
+/**
+ * Factory for creating nsIUnicharInputStream
+ * @implements nsIUnicharInputStreamFactory
+ * @note nsIUnicharInputStream instances cannot be created via
+ *       createInstance. Code must use one of the custom factory methods.
+ */
+#define NS_SIMPLE_UNICHAR_STREAM_FACTORY_CONTRACTID \
+  "@mozilla.org/xpcom/simple-unichar-stream-factory;1"
+
+/**
+ * The global thread manager service.  This component is a singleton.
+ * @implements nsIThreadManager
+ */
+#define NS_THREADMANAGER_CONTRACTID "@mozilla.org/thread-manager;1"
+
+/**
+ * A thread pool component.
+ * @implements nsIThreadPool
+ */
+#define NS_THREADPOOL_CONTRACTID "@mozilla.org/thread-pool;1"
+
+/**
+ * The contract id for the nsIXULAppInfo service.
+ */
+#define XULAPPINFO_SERVICE_CONTRACTID \
+  "@mozilla.org/xre/app-info;1"
+
+/**
+ * The contract id for the nsIXULRuntime service.
+ */
+#define XULRUNTIME_SERVICE_CONTRACTID \
+  "@mozilla.org/xre/runtime;1"
+
+#endif  // nsXPCOMCIDInternal_h__
diff --git a/xpcom/build/nsXPCOMPrivate.h b/xpcom/build/nsXPCOMPrivate.h
new file mode 100644
index 0000000000..99a9940133
--- /dev/null
+++ b/xpcom/build/nsXPCOMPrivate.h
@@ -0,0 +1,317 @@
+/* -*- 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/. */
+
+#ifndef nsXPCOMPrivate_h__
+#define nsXPCOMPrivate_h__
+
+#include "nscore.h"
+#include "nsXPCOM.h"
+#include "nsXPCOMStrings.h"
+#include "xptcall.h"
+
+class nsStringContainer;
+class nsCStringContainer;
+class nsPurpleBufferEntry;
+
+/**
+ * During this shutdown notification all threads which run XPCOM code must
+ * be joined.
+ */
+#define NS_XPCOM_SHUTDOWN_THREADS_OBSERVER_ID "xpcom-shutdown-threads"
+
+/**
+ * During this shutdown notification all module loaders must unload XPCOM
+ * modules.
+ */
+#define NS_XPCOM_SHUTDOWN_LOADERS_OBSERVER_ID "xpcom-shutdown-loaders"
+
+// PUBLIC
+typedef nsresult   (*InitFunc)(nsIServiceManager** aResult,
+                               nsIFile* aBinDirectory,
+                               nsIDirectoryServiceProvider* aAppFileLocationProvider);
+typedef nsresult   (*ShutdownFunc)(nsIServiceManager* aServMgr);
+typedef nsresult   (*GetServiceManagerFunc)(nsIServiceManager** aResult);
+typedef nsresult   (*GetComponentManagerFunc)(nsIComponentManager** aResult);
+typedef nsresult   (*GetComponentRegistrarFunc)(nsIComponentRegistrar** aResult);
+typedef nsresult   (*GetMemoryManagerFunc)(nsIMemory** aResult);
+typedef nsresult   (*NewLocalFileFunc)(const nsAString& aPath,
+                                       bool aFollowLinks, nsIFile** aResult);
+typedef nsresult   (*NewNativeLocalFileFunc)(const nsACString& aPath,
+                                             bool aFollowLinks,
+                                             nsIFile** aResult);
+
+typedef nsresult   (*GetDebugFunc)(nsIDebug2** aResult);
+
+typedef nsresult   (*StringContainerInitFunc)(nsStringContainer&);
+typedef nsresult   (*StringContainerInit2Func)(nsStringContainer&,
+                                               const char16_t*,
+                                               uint32_t, uint32_t);
+typedef void       (*StringContainerFinishFunc)(nsStringContainer&);
+typedef uint32_t   (*StringGetDataFunc)(const nsAString&, const char16_t**,
+                                        bool*);
+typedef uint32_t   (*StringGetMutableDataFunc)(nsAString&, uint32_t,
+                                               char16_t**);
+typedef char16_t*  (*StringCloneDataFunc)(const nsAString&);
+typedef nsresult   (*StringSetDataFunc)(nsAString&, const char16_t*, uint32_t);
+typedef nsresult   (*StringSetDataRangeFunc)(nsAString&, uint32_t, uint32_t,
+                                             const char16_t*, uint32_t);
+typedef nsresult   (*StringCopyFunc)(nsAString&, const nsAString&);
+typedef void       (*StringSetIsVoidFunc)(nsAString&, const bool);
+typedef bool       (*StringGetIsVoidFunc)(const nsAString&);
+
+typedef nsresult   (*CStringContainerInitFunc)(nsCStringContainer&);
+typedef nsresult   (*CStringContainerInit2Func)(nsCStringContainer&,
+                                                const char*,
+                                                uint32_t, uint32_t);
+typedef void       (*CStringContainerFinishFunc)(nsCStringContainer&);
+typedef uint32_t   (*CStringGetDataFunc)(const nsACString&, const char**,
+                                         bool*);
+typedef uint32_t   (*CStringGetMutableDataFunc)(nsACString&, uint32_t, char**);
+typedef char*      (*CStringCloneDataFunc)(const nsACString&);
+typedef nsresult   (*CStringSetDataFunc)(nsACString&, const char*, uint32_t);
+typedef nsresult   (*CStringSetDataRangeFunc)(nsACString&, uint32_t, uint32_t,
+                                              const char*, uint32_t);
+typedef nsresult   (*CStringCopyFunc)(nsACString&, const nsACString&);
+typedef void       (*CStringSetIsVoidFunc)(nsACString&, const bool);
+typedef bool       (*CStringGetIsVoidFunc)(const nsACString&);
+
+typedef nsresult   (*CStringToUTF16)(const nsACString&, nsCStringEncoding,
+                                     nsAString&);
+typedef nsresult   (*UTF16ToCString)(const nsAString&, nsCStringEncoding,
+                                     nsACString&);
+
+typedef void*      (*AllocFunc)(size_t aSize);
+typedef void*      (*ReallocFunc)(void* aPtr, size_t aSize);
+typedef void       (*FreeFunc)(void* aPtr);
+
+typedef void       (*DebugBreakFunc)(uint32_t aSeverity,
+                                     const char* aStr, const char* aExpr,
+                                     const char* aFile, int32_t aLine);
+
+typedef void       (*xpcomVoidFunc)();
+typedef void       (*LogAddRefFunc)(void*, nsrefcnt, const char*, uint32_t);
+typedef void       (*LogReleaseFunc)(void*, nsrefcnt, const char*);
+typedef void       (*LogCtorFunc)(void*, const char*, uint32_t);
+typedef void       (*LogCOMPtrFunc)(void*, nsISupports*);
+
+typedef nsresult   (*GetXPTCallStubFunc)(REFNSIID, nsIXPTCProxy*,
+                                         nsISomeInterface**);
+typedef void       (*DestroyXPTCallStubFunc)(nsISomeInterface*);
+typedef nsresult   (*InvokeByIndexFunc)(nsISupports*, uint32_t, uint32_t,
+                                        nsXPTCVariant*);
+typedef bool       (*CycleCollectorFunc)(nsISupports*);
+typedef nsPurpleBufferEntry*
+                   (*CycleCollectorSuspect2Func)(void*,
+                                                 nsCycleCollectionParticipant*);
+typedef bool       (*CycleCollectorForget2Func)(nsPurpleBufferEntry*);
+typedef void       (*CycleCollectorSuspect3Func)(void*,
+                                                 nsCycleCollectionParticipant*,
+                                                 nsCycleCollectingAutoRefCnt*,
+                                                 bool*);
+// PRIVATE AND DEPRECATED
+typedef NS_CALLBACK(XPCOMExitRoutine)(void);
+
+typedef nsresult   (*RegisterXPCOMExitRoutineFunc)(XPCOMExitRoutine aExitRoutine,
+                                                   uint32_t aPriority);
+typedef nsresult   (*UnregisterXPCOMExitRoutineFunc)(XPCOMExitRoutine aExitRoutine);
+
+typedef struct XPCOMFunctions
+{
+  uint32_t version;
+  uint32_t size;
+
+  InitFunc init;
+  ShutdownFunc shutdown;
+  GetServiceManagerFunc getServiceManager;
+  GetComponentManagerFunc getComponentManager;
+  GetComponentRegistrarFunc getComponentRegistrar;
+  GetMemoryManagerFunc getMemoryManager;
+  NewLocalFileFunc newLocalFile;
+  NewNativeLocalFileFunc newNativeLocalFile;
+
+  RegisterXPCOMExitRoutineFunc registerExitRoutine;
+  UnregisterXPCOMExitRoutineFunc unregisterExitRoutine;
+
+  // Added for Mozilla 1.5
+  GetDebugFunc getDebug;
+  void* getTraceRefcnt;
+
+  // Added for Mozilla 1.7
+  StringContainerInitFunc stringContainerInit;
+  StringContainerFinishFunc stringContainerFinish;
+  StringGetDataFunc stringGetData;
+  StringSetDataFunc stringSetData;
+  StringSetDataRangeFunc stringSetDataRange;
+  StringCopyFunc stringCopy;
+  CStringContainerInitFunc cstringContainerInit;
+  CStringContainerFinishFunc cstringContainerFinish;
+  CStringGetDataFunc cstringGetData;
+  CStringSetDataFunc cstringSetData;
+  CStringSetDataRangeFunc cstringSetDataRange;
+  CStringCopyFunc cstringCopy;
+  CStringToUTF16 cstringToUTF16;
+  UTF16ToCString utf16ToCString;
+  StringCloneDataFunc stringCloneData;
+  CStringCloneDataFunc cstringCloneData;
+
+  // Added for Mozilla 1.8
+  AllocFunc allocFunc;
+  ReallocFunc reallocFunc;
+  FreeFunc freeFunc;
+  StringContainerInit2Func stringContainerInit2;
+  CStringContainerInit2Func cstringContainerInit2;
+  StringGetMutableDataFunc stringGetMutableData;
+  CStringGetMutableDataFunc cstringGetMutableData;
+  void* init3; // obsolete
+
+  // Added for Mozilla 1.9
+  DebugBreakFunc debugBreakFunc;
+  xpcomVoidFunc logInitFunc;
+  xpcomVoidFunc logTermFunc;
+  LogAddRefFunc logAddRefFunc;
+  LogReleaseFunc logReleaseFunc;
+  LogCtorFunc logCtorFunc;
+  LogCtorFunc logDtorFunc;
+  LogCOMPtrFunc logCOMPtrAddRefFunc;
+  LogCOMPtrFunc logCOMPtrReleaseFunc;
+  GetXPTCallStubFunc getXPTCallStubFunc;
+  DestroyXPTCallStubFunc destroyXPTCallStubFunc;
+  InvokeByIndexFunc invokeByIndexFunc;
+  CycleCollectorFunc cycleSuspectFunc; // obsolete: use cycleSuspect3Func
+  CycleCollectorFunc cycleForgetFunc; // obsolete
+  StringSetIsVoidFunc stringSetIsVoid;
+  StringGetIsVoidFunc stringGetIsVoid;
+  CStringSetIsVoidFunc cstringSetIsVoid;
+  CStringGetIsVoidFunc cstringGetIsVoid;
+
+  // Added for Mozilla 1.9.1
+  CycleCollectorSuspect2Func cycleSuspect2Func; // obsolete: use cycleSuspect3Func
+  CycleCollectorForget2Func cycleForget2Func; // obsolete
+
+  CycleCollectorSuspect3Func cycleSuspect3Func;
+
+} XPCOMFunctions;
+
+typedef nsresult (*GetFrozenFunctionsFunc)(XPCOMFunctions* aEntryPoints,
+                                           const char* aLibraryPath);
+XPCOM_API(nsresult) NS_GetFrozenFunctions(XPCOMFunctions* aEntryPoints,
+                                          const char* aLibraryPath);
+
+
+namespace mozilla {
+
+/**
+ * Shutdown XPCOM. You must call this method after you are finished
+ * using xpcom.
+ *
+ * @param aServMgr          The service manager which was returned by NS_InitXPCOM.
+ *                          This will release servMgr.  You may pass null.
+ *
+ * @return NS_OK for success;
+ *         other error codes indicate a failure during shutdown
+ *
+ */
+nsresult
+ShutdownXPCOM(nsIServiceManager* aServMgr);
+
+void SetICUMemoryFunctions();
+
+/**
+ * C++ namespaced version of NS_LogTerm.
+ */
+void LogTerm();
+
+} // namespace mozilla
+
+
+// think hard before changing this
+#define XPCOM_GLUE_VERSION 1
+
+
+/* XPCOM Specific Defines
+ *
+ * XPCOM_DLL              - name of the loadable xpcom library on disk.
+ * XUL_DLL                - name of the loadable XUL library on disk
+ * XPCOM_SEARCH_KEY       - name of the environment variable that can be
+ *                          modified to include additional search paths.
+ * GRE_CONF_NAME          - Name of the GRE Configuration file
+ */
+
+#if defined(XP_WIN32)
+
+#define XPCOM_SEARCH_KEY  "PATH"
+#define GRE_CONF_NAME     "gre.config"
+#define GRE_WIN_REG_LOC   L"Software\\mozilla.org\\GRE"
+#define XPCOM_DLL         XUL_DLL
+#define LXPCOM_DLL        LXUL_DLL
+#define XUL_DLL           "xul.dll"
+#define LXUL_DLL          L"xul.dll"
+
+#else // Unix
+#include <limits.h> // for PATH_MAX
+
+#define XPCOM_DLL         XUL_DLL
+
+// you have to love apple..
+#ifdef XP_MACOSX
+#define XPCOM_SEARCH_KEY  "DYLD_LIBRARY_PATH"
+#define GRE_FRAMEWORK_NAME "XUL.framework"
+#define XUL_DLL            "XUL"
+#else
+#define XPCOM_SEARCH_KEY  "LD_LIBRARY_PATH"
+#define XUL_DLL   "libxul" MOZ_DLL_SUFFIX
+#endif
+
+#define GRE_CONF_NAME ".gre.config"
+#define GRE_CONF_PATH "/etc/gre.conf"
+#define GRE_CONF_DIR  "/etc/gre.d"
+#define GRE_USER_CONF_DIR ".gre.d"
+#endif
+
+#if defined(XP_WIN)
+  #define XPCOM_FILE_PATH_SEPARATOR       "\\"
+  #define XPCOM_ENV_PATH_SEPARATOR        ";"
+#elif defined(XP_UNIX)
+  #define XPCOM_FILE_PATH_SEPARATOR       "/"
+  #define XPCOM_ENV_PATH_SEPARATOR        ":"
+#else
+  #error need_to_define_your_file_path_separator_and_illegal_characters
+#endif
+
+#ifdef AIX
+#include <sys/param.h>
+#endif
+
+#ifndef MAXPATHLEN
+#ifdef PATH_MAX
+#define MAXPATHLEN PATH_MAX
+#elif defined(_MAX_PATH)
+#define MAXPATHLEN _MAX_PATH
+#elif defined(CCHMAXPATH)
+#define MAXPATHLEN CCHMAXPATH
+#else
+#define MAXPATHLEN 1024
+#endif
+#endif
+
+extern bool gXPCOMShuttingDown;
+extern bool gXPCOMThreadsShutDown;
+
+// Needed by the IPC layer from off the main thread
+extern char16_t* gGREBinPath;
+
+namespace mozilla {
+namespace services {
+
+/**
+ * Clears service cache, sets gXPCOMShuttingDown
+ */
+void Shutdown();
+
+} // namespace services
+} // namespace mozilla
+
+#endif
diff --git a/xpcom/build/nsXPCOMStrings.cpp b/xpcom/build/nsXPCOMStrings.cpp
new file mode 100644
index 0000000000..617edbab2f
--- /dev/null
+++ b/xpcom/build/nsXPCOMStrings.cpp
@@ -0,0 +1,366 @@
+/* -*- 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 "nsString.h"
+#include "nsCharTraits.h"
+
+#include "nsXPCOMStrings.h"
+#include "nsNativeCharsetUtils.h"
+
+/* ------------------------------------------------------------------------- */
+
+XPCOM_API(nsresult)
+NS_StringContainerInit(nsStringContainer& aContainer)
+{
+  NS_ASSERTION(sizeof(nsStringContainer_base) >= sizeof(nsString),
+               "nsStringContainer is not large enough");
+
+  // use placement new to avoid heap allocating nsString object
+  new (&aContainer) nsString();
+
+  return NS_OK;
+}
+
+XPCOM_API(nsresult)
+NS_StringContainerInit2(nsStringContainer& aContainer,
+                        const char16_t* aData,
+                        uint32_t aDataLength,
+                        uint32_t aFlags)
+{
+  NS_ASSERTION(sizeof(nsStringContainer_base) >= sizeof(nsString),
+               "nsStringContainer is not large enough");
+
+  if (!aData) {
+    new (&aContainer) nsString();
+  } else {
+    if (aDataLength == UINT32_MAX) {
+      if (NS_WARN_IF(aFlags & NS_STRING_CONTAINER_INIT_SUBSTRING)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      aDataLength = nsCharTraits<char16_t>::length(aData);
+    }
+
+    if (aFlags & (NS_STRING_CONTAINER_INIT_DEPEND |
+                  NS_STRING_CONTAINER_INIT_ADOPT)) {
+      uint32_t flags;
+      if (aFlags & NS_STRING_CONTAINER_INIT_SUBSTRING) {
+        flags = nsSubstring::F_NONE;
+      } else {
+        flags = nsSubstring::F_TERMINATED;
+      }
+
+      if (aFlags & NS_STRING_CONTAINER_INIT_ADOPT) {
+        flags |= nsSubstring::F_OWNED;
+      }
+
+      new (&aContainer) nsSubstring(const_cast<char16_t*>(aData),
+                                    aDataLength, flags);
+    } else {
+      new (&aContainer) nsString(aData, aDataLength);
+    }
+  }
+
+  return NS_OK;
+}
+
+XPCOM_API(void)
+NS_StringContainerFinish(nsStringContainer& aContainer)
+{
+  // call the nsString dtor
+  reinterpret_cast<nsString*>(&aContainer)->~nsString();
+}
+
+/* ------------------------------------------------------------------------- */
+
+XPCOM_API(uint32_t)
+NS_StringGetData(const nsAString& aStr, const char16_t** aData,
+                 bool* aTerminated)
+{
+  if (aTerminated) {
+    *aTerminated = aStr.IsTerminated();
+  }
+
+  *aData = aStr.BeginReading();
+  return aStr.Length();
+}
+
+XPCOM_API(uint32_t)
+NS_StringGetMutableData(nsAString& aStr, uint32_t aDataLength,
+                        char16_t** aData)
+{
+  if (aDataLength != UINT32_MAX) {
+    aStr.SetLength(aDataLength);
+    if (aStr.Length() != aDataLength) {
+      *aData = nullptr;
+      return 0;
+    }
+  }
+
+  *aData = aStr.BeginWriting();
+  return aStr.Length();
+}
+
+XPCOM_API(char16_t*)
+NS_StringCloneData(const nsAString& aStr)
+{
+  return ToNewUnicode(aStr);
+}
+
+XPCOM_API(nsresult)
+NS_StringSetData(nsAString& aStr, const char16_t* aData, uint32_t aDataLength)
+{
+  aStr.Assign(aData, aDataLength);
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(nsresult)
+NS_StringSetDataRange(nsAString& aStr,
+                      uint32_t aCutOffset, uint32_t aCutLength,
+                      const char16_t* aData, uint32_t aDataLength)
+{
+  if (aCutOffset == UINT32_MAX) {
+    // append case
+    if (aData) {
+      aStr.Append(aData, aDataLength);
+    }
+    return NS_OK; // XXX report errors
+  }
+
+  if (aCutLength == UINT32_MAX) {
+    aCutLength = aStr.Length() - aCutOffset;
+  }
+
+  if (aData) {
+    if (aDataLength == UINT32_MAX) {
+      aStr.Replace(aCutOffset, aCutLength, nsDependentString(aData));
+    } else {
+      aStr.Replace(aCutOffset, aCutLength, Substring(aData, aDataLength));
+    }
+  } else {
+    aStr.Cut(aCutOffset, aCutLength);
+  }
+
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(nsresult)
+NS_StringCopy(nsAString& aDest, const nsAString& aSrc)
+{
+  aDest.Assign(aSrc);
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(void)
+NS_StringSetIsVoid(nsAString& aStr, const bool aIsVoid)
+{
+  aStr.SetIsVoid(aIsVoid);
+}
+
+XPCOM_API(bool)
+NS_StringGetIsVoid(const nsAString& aStr)
+{
+  return aStr.IsVoid();
+}
+
+/* ------------------------------------------------------------------------- */
+
+XPCOM_API(nsresult)
+NS_CStringContainerInit(nsCStringContainer& aContainer)
+{
+  NS_ASSERTION(sizeof(nsStringContainer_base) >= sizeof(nsCString),
+               "nsCStringContainer is not large enough");
+
+  // use placement new to avoid heap allocating nsCString object
+  new (&aContainer) nsCString();
+
+  return NS_OK;
+}
+
+XPCOM_API(nsresult)
+NS_CStringContainerInit2(nsCStringContainer& aContainer,
+                         const char* aData,
+                         uint32_t aDataLength,
+                         uint32_t aFlags)
+{
+  NS_ASSERTION(sizeof(nsStringContainer_base) >= sizeof(nsCString),
+               "nsStringContainer is not large enough");
+
+  if (!aData) {
+    new (&aContainer) nsCString();
+  } else {
+    if (aDataLength == UINT32_MAX) {
+      if (NS_WARN_IF(aFlags & NS_CSTRING_CONTAINER_INIT_SUBSTRING)) {
+        return NS_ERROR_INVALID_ARG;
+      }
+      aDataLength = nsCharTraits<char>::length(aData);
+    }
+
+    if (aFlags & (NS_CSTRING_CONTAINER_INIT_DEPEND |
+                  NS_CSTRING_CONTAINER_INIT_ADOPT)) {
+      uint32_t flags;
+      if (aFlags & NS_CSTRING_CONTAINER_INIT_SUBSTRING) {
+        flags = nsCSubstring::F_NONE;
+      } else {
+        flags = nsCSubstring::F_TERMINATED;
+      }
+
+      if (aFlags & NS_CSTRING_CONTAINER_INIT_ADOPT) {
+        flags |= nsCSubstring::F_OWNED;
+      }
+
+      new (&aContainer) nsCSubstring(const_cast<char*>(aData),
+                                     aDataLength, flags);
+    } else {
+      new (&aContainer) nsCString(aData, aDataLength);
+    }
+  }
+
+  return NS_OK;
+}
+
+XPCOM_API(void)
+NS_CStringContainerFinish(nsCStringContainer& aContainer)
+{
+  // call the nsCString dtor
+  reinterpret_cast<nsCString*>(&aContainer)->~nsCString();
+}
+
+/* ------------------------------------------------------------------------- */
+
+XPCOM_API(uint32_t)
+NS_CStringGetData(const nsACString& aStr, const char** aData,
+                  bool* aTerminated)
+{
+  if (aTerminated) {
+    *aTerminated = aStr.IsTerminated();
+  }
+
+  *aData = aStr.BeginReading();
+  return aStr.Length();
+}
+
+XPCOM_API(uint32_t)
+NS_CStringGetMutableData(nsACString& aStr, uint32_t aDataLength, char** aData)
+{
+  if (aDataLength != UINT32_MAX) {
+    aStr.SetLength(aDataLength);
+    if (aStr.Length() != aDataLength) {
+      *aData = nullptr;
+      return 0;
+    }
+  }
+
+  *aData = aStr.BeginWriting();
+  return aStr.Length();
+}
+
+XPCOM_API(char*)
+NS_CStringCloneData(const nsACString& aStr)
+{
+  return ToNewCString(aStr);
+}
+
+XPCOM_API(nsresult)
+NS_CStringSetData(nsACString& aStr, const char* aData, uint32_t aDataLength)
+{
+  aStr.Assign(aData, aDataLength);
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(nsresult)
+NS_CStringSetDataRange(nsACString& aStr,
+                       uint32_t aCutOffset, uint32_t aCutLength,
+                       const char* aData, uint32_t aDataLength)
+{
+  if (aCutOffset == UINT32_MAX) {
+    // append case
+    if (aData) {
+      aStr.Append(aData, aDataLength);
+    }
+    return NS_OK; // XXX report errors
+  }
+
+  if (aCutLength == UINT32_MAX) {
+    aCutLength = aStr.Length() - aCutOffset;
+  }
+
+  if (aData) {
+    if (aDataLength == UINT32_MAX) {
+      aStr.Replace(aCutOffset, aCutLength, nsDependentCString(aData));
+    } else {
+      aStr.Replace(aCutOffset, aCutLength, Substring(aData, aDataLength));
+    }
+  } else {
+    aStr.Cut(aCutOffset, aCutLength);
+  }
+
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(nsresult)
+NS_CStringCopy(nsACString& aDest, const nsACString& aSrc)
+{
+  aDest.Assign(aSrc);
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(void)
+NS_CStringSetIsVoid(nsACString& aStr, const bool aIsVoid)
+{
+  aStr.SetIsVoid(aIsVoid);
+}
+
+XPCOM_API(bool)
+NS_CStringGetIsVoid(const nsACString& aStr)
+{
+  return aStr.IsVoid();
+}
+
+/* ------------------------------------------------------------------------- */
+
+XPCOM_API(nsresult)
+NS_CStringToUTF16(const nsACString& aSrc,
+                  nsCStringEncoding aSrcEncoding,
+                  nsAString& aDest)
+{
+  switch (aSrcEncoding) {
+    case NS_CSTRING_ENCODING_ASCII:
+      CopyASCIItoUTF16(aSrc, aDest);
+      break;
+    case NS_CSTRING_ENCODING_UTF8:
+      CopyUTF8toUTF16(aSrc, aDest);
+      break;
+    case NS_CSTRING_ENCODING_NATIVE_FILESYSTEM:
+      NS_CopyNativeToUnicode(aSrc, aDest);
+      break;
+    default:
+      return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
+  return NS_OK; // XXX report errors
+}
+
+XPCOM_API(nsresult)
+NS_UTF16ToCString(const nsAString& aSrc,
+                  nsCStringEncoding aDestEncoding,
+                  nsACString& aDest)
+{
+  switch (aDestEncoding) {
+    case NS_CSTRING_ENCODING_ASCII:
+      LossyCopyUTF16toASCII(aSrc, aDest);
+      break;
+    case NS_CSTRING_ENCODING_UTF8:
+      CopyUTF16toUTF8(aSrc, aDest);
+      break;
+    case NS_CSTRING_ENCODING_NATIVE_FILESYSTEM:
+      NS_CopyUnicodeToNative(aSrc, aDest);
+      break;
+    default:
+      return NS_ERROR_NOT_IMPLEMENTED;
+  }
+
+  return NS_OK; // XXX report errors
+}
diff --git a/xpcom/build/nsXREAppData.h b/xpcom/build/nsXREAppData.h
new file mode 100644
index 0000000000..fbc7adb8fc
--- /dev/null
+++ b/xpcom/build/nsXREAppData.h
@@ -0,0 +1,164 @@
+/* -*- 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/. */
+
+#ifndef nsXREAppData_h
+#define nsXREAppData_h
+
+#include <stdint.h>
+#include "mozilla/Attributes.h"
+
+class nsIFile;
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+namespace sandbox {
+class BrokerServices;
+}
+#endif
+
+/**
+ * Application-specific data needed to start the apprunner.
+ *
+ * @note When this structure is allocated and manipulated by XRE_CreateAppData,
+ *       string fields will be allocated with moz_xmalloc, and interface pointers
+ *       are strong references.
+ */
+struct nsXREAppData
+{
+  /**
+   * This should be set to sizeof(nsXREAppData). This structure may be
+   * extended in future releases, and this ensures that binary compatibility
+   * is maintained.
+   */
+  uint32_t size;
+
+  /**
+   * The directory of the application to be run. May be null if the
+   * xulrunner and the app are installed into the same directory.
+   */
+  nsIFile* MOZ_NON_OWNING_REF directory;
+
+  /**
+   * The name of the application vendor. This must be ASCII, and is normally
+   * mixed-case, e.g. "Mozilla". Optional (may be null), but highly
+   * recommended. Must not be the empty string.
+   */
+  const char* vendor;
+
+  /**
+   * The name of the application. This must be ASCII, and is normally
+   * mixed-case, e.g. "Firefox". Required (must not be null or an empty
+   * string).
+   */
+  const char* name;
+
+  /**
+   * The internal name of the application for remoting purposes. When left
+   * unspecified, "name" is used instead. This must be ASCII, and is normally
+   * lowercase, e.g. "firefox". Optional (may be null but not an empty string).
+   */
+  const char* remotingName;
+
+  /**
+   * The major version, e.g. "0.8.0+". Optional (may be null), but
+   * required for advanced application features such as the extension
+   * manager and update service. Must not be the empty string.
+   */
+  const char* version;
+
+  /**
+   * The application's build identifier, e.g. "2004051604"
+   */
+  const char* buildID;
+
+  /**
+   * The application's UUID. Used by the extension manager to determine
+   * compatible extensions. Optional, but required for advanced application
+   * features such as the extension manager and update service.
+   *
+   * This has traditionally been in the form
+   * "{AAAAAAAA-BBBB-CCCC-DDDD-EEEEEEEEEEEE}" but for new applications
+   * a more readable form is encouraged: "appname@vendor.tld". Only
+   * the following characters are allowed: a-z A-Z 0-9 - . @ _ { } *
+   */
+  const char* ID;
+
+  /**
+   * The copyright information to print for the -h commandline flag,
+   * e.g. "Copyright (c) 2003 mozilla.org".
+   */
+  const char* copyright;
+
+  /**
+   * Combination of NS_XRE_ prefixed flags (defined below).
+   */
+  uint32_t flags;
+
+  /**
+   * The location of the XRE. XRE_main may not be able to figure this out
+   * programatically.
+   */
+  nsIFile* MOZ_NON_OWNING_REF xreDirectory;
+
+  /**
+   * The minimum/maximum compatible XRE version.
+   */
+  const char* minVersion;
+  const char* maxVersion;
+
+  /**
+   * The server URL to send crash reports to.
+   */
+  const char* crashReporterURL;
+
+  /**
+   * The profile directory that will be used. Optional (may be null). Must not
+   * be the empty string, must be ASCII. The path is split into components
+   * along the path separator characters '/' and '\'.
+   *
+   * The application data directory ("UAppData", see below) is normally
+   * composed as follows, where $HOME is platform-specific:
+   *
+   *   UAppData = $HOME[/$vendor]/$name
+   *
+   * If present, the 'profile' string will be used instead of the combination of
+   * vendor and name as follows:
+   *
+   *   UAppData = $HOME/$profile
+   */
+  const char* profile;
+
+  /**
+   * The application name to use in the User Agent string.
+   */
+  const char* UAName;
+
+#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+  /**
+   * Chromium sandbox BrokerServices.
+   */
+  sandbox::BrokerServices* sandboxBrokerServices;
+#endif
+};
+
+/**
+ * Indicates whether or not the profile migrator service may be
+ * invoked at startup when creating a profile.
+ */
+#define NS_XRE_ENABLE_PROFILE_MIGRATOR (1 << 1)
+
+/**
+ * Indicates the Windows DLL Blocklist initialized properly. For testing
+ * purposes only. Set in nsBrowserApp on startup, automated tests then
+ * check the result.
+ */
+#define NS_XRE_DLL_BLOCKLIST_ENABLED (1 << 2)
+
+/**
+ * Indicates whether or not to use Breakpad crash reporting.
+ */
+#define NS_XRE_ENABLE_CRASH_REPORTER (1 << 3)
+
+#endif // nsXREAppData_h
diff --git a/xpcom/build/nsXULAppAPI.h b/xpcom/build/nsXULAppAPI.h
new file mode 100644
index 0000000000..426a58f063
--- /dev/null
+++ b/xpcom/build/nsXULAppAPI.h
@@ -0,0 +1,538 @@
+/* -*- 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/. */
+
+#ifndef _nsXULAppAPI_h__
+#define _nsXULAppAPI_h__
+
+#include "nsID.h"
+#include "xrecore.h"
+#include "nsXPCOM.h"
+#include "nsISupports.h"
+#include "mozilla/Logging.h"
+#include "nsXREAppData.h"
+#include "js/TypeDecls.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Vector.h"
+#include "mozilla/TimeStamp.h"
+#include "XREChildData.h"
+#include "XREShellData.h"
+
+/**
+ * A directory service key which provides the platform-correct "application
+ * data" directory as follows, where $name and $vendor are as defined above and
+ * $vendor is optional:
+ *
+ * Windows:
+ *   HOME = Documents and Settings\$USER\Application Data
+ *   UAppData = $HOME[\$vendor]\$name
+ *
+ * Unix:
+ *   HOME = ~
+ *   UAppData = $HOME/.[$vendor/]$name
+ *
+ * Mac:
+ *   HOME = ~
+ *   UAppData = $HOME/Library/Application Support/$name
+ *
+ * Note that the "profile" member above will change the value of UAppData as
+ * follows:
+ *
+ * Windows:
+ *   UAppData = $HOME\$profile
+ *
+ * Unix:
+ *   UAppData = $HOME/.$profile
+ *
+ * Mac:
+ *   UAppData = $HOME/Library/Application Support/$profile
+ */
+#define XRE_USER_APP_DATA_DIR "UAppData"
+
+/**
+ * A directory service key which provides a list of all enabled extension
+ * directories and files (packed XPIs).  The list includes compatible
+ * platform-specific extension subdirectories.
+ *
+ * @note The directory list will have no members when the application is
+ *       launched in safe mode.
+ */
+#define XRE_EXTENSIONS_DIR_LIST "XREExtDL"
+
+/**
+ * A directory service key which provides the executable file used to
+ * launch the current process.  This is the same value returned by the
+ * XRE_GetBinaryPath function defined below.
+ */
+#define XRE_EXECUTABLE_FILE "XREExeF"
+
+/**
+ * A directory service key which specifies the profile
+ * directory. Unlike the NS_APP_USER_PROFILE_50_DIR key, this key may
+ * be available when the profile hasn't been "started", or after is
+ * has been shut down. If the application is running without a
+ * profile, such as when showing the profile manager UI, this key will
+ * not be available. This key is provided by the XUL apprunner or by
+ * the aAppDirProvider object passed to XRE_InitEmbedding.
+ */
+#define NS_APP_PROFILE_DIR_STARTUP "ProfDS"
+
+/**
+ * A directory service key which specifies the profile
+ * directory. Unlike the NS_APP_USER_PROFILE_LOCAL_50_DIR key, this key may
+ * be available when the profile hasn't been "started", or after is
+ * has been shut down. If the application is running without a
+ * profile, such as when showing the profile manager UI, this key will
+ * not be available. This key is provided by the XUL apprunner or by
+ * the aAppDirProvider object passed to XRE_InitEmbedding.
+ */
+#define NS_APP_PROFILE_LOCAL_DIR_STARTUP "ProfLDS"
+
+/**
+ * A directory service key which specifies the system extension
+ * parent directory containing platform-specific extensions.
+ * This key may not be available on all platforms.
+ */
+#define XRE_SYS_LOCAL_EXTENSION_PARENT_DIR "XRESysLExtPD"
+
+/**
+ * A directory service key which specifies the system extension
+ * parent directory containing platform-independent extensions.
+ * This key may not be available on all platforms.
+ * Additionally, the directory may be equal to that returned by
+ * XRE_SYS_LOCAL_EXTENSION_PARENT_DIR on some platforms.
+ */
+#define XRE_SYS_SHARE_EXTENSION_PARENT_DIR "XRESysSExtPD"
+
+#if defined(XP_UNIX) || defined(XP_MACOSX)
+/**
+ * Directory service keys for the system-wide and user-specific
+ * directories where host manifests used by the WebExtensions
+ * native messaging feature are found.
+ */
+#define XRE_SYS_NATIVE_MESSAGING_MANIFESTS "XRESysNativeMessaging"
+#define XRE_USER_NATIVE_MESSAGING_MANIFESTS "XREUserNativeMessaging"
+#endif
+
+/**
+ * A directory service key which specifies the user system extension
+ * parent directory.
+ */
+#define XRE_USER_SYS_EXTENSION_DIR "XREUSysExt"
+
+/**
+ * A directory service key which specifies the distribution specific files for
+ * the application.
+ */
+#define XRE_APP_DISTRIBUTION_DIR "XREAppDist"
+
+/**
+ * A directory service key which specifies the location for system add-ons.
+ */
+#define XRE_APP_FEATURES_DIR "XREAppFeat"
+
+/**
+ * A directory service key which specifies the location for app dir add-ons.
+ * Should be a synonym for XCurProcD everywhere except in tests.
+ */
+#define XRE_ADDON_APP_DIR "XREAddonAppDir"
+
+/**
+ * A directory service key which provides the update directory. Callers should
+ * fall back to appDir.
+ * Windows:    If vendor name exists:
+ *             Documents and Settings\<User>\Local Settings\Application Data\
+ *             <vendor name>\updates\
+ *             <hash of the path to XRE_EXECUTABLE_FILE’s parent directory>
+ *
+ *             If vendor name doesn't exist, but product name exists:
+ *             Documents and Settings\<User>\Local Settings\Application Data\
+ *             <product name>\updates\
+ *             <hash of the path to XRE_EXECUTABLE_FILE’s parent directory>
+ *
+ *             If neither vendor nor product name exists:
+ *               If app dir is under Program Files:
+ *               Documents and Settings\<User>\Local Settings\Application Data\
+ *               <relative path to app dir from Program Files>
+ *
+ *               If app dir isn’t under Program Files:
+ *               Documents and Settings\<User>\Local Settings\Application Data\
+ *               <MOZ_APP_NAME>
+ *
+ * Mac:        ~/Library/Caches/Mozilla/updates/<absolute path to app dir>
+ *
+ * Gonk:       /data/local
+ *
+ * All others: Parent directory of XRE_EXECUTABLE_FILE.
+ */
+#define XRE_UPDATE_ROOT_DIR "UpdRootD"
+
+/**
+ * A directory service key which provides an alternate location
+ * to UpdRootD to  to store large files. This key is currently
+ * only implemented in the Gonk directory service provider.
+ */
+
+#define XRE_UPDATE_ARCHIVE_DIR "UpdArchD"
+
+/**
+ * A directory service key which provides the directory where an OS update is
+*  applied.
+ * At present this is supported only in Gonk.
+ */
+#define XRE_OS_UPDATE_APPLY_TO_DIR "OSUpdApplyToD"
+
+/**
+ * Begin an XUL application. Does not return until the user exits the
+ * application.
+ *
+ * @param argc/argv Command-line parameters to pass to the application. On
+ *                  Windows, these should be in UTF8. On unix-like platforms
+ *                  these are in the "native" character set.
+ *
+ * @param aAppData  Information about the application to be run.
+ *
+ * @param aFlags    Platform specific flags.
+ *
+ * @return         A native result code suitable for returning from main().
+ *
+ * @note           If the binary is linked against the standalone XPCOM glue,
+ *                 XPCOMGlueStartup() should be called before this method.
+ */
+XRE_API(int,
+        XRE_main, (int argc, char* argv[], const nsXREAppData* aAppData,
+                   uint32_t aFlags))
+
+/**
+ * Given a path relative to the current working directory (or an absolute
+ * path), return an appropriate nsIFile object.
+ *
+ * @note Pass UTF8 strings on Windows... native charset on other platforms.
+ */
+XRE_API(nsresult,
+        XRE_GetFileFromPath, (const char* aPath, nsIFile** aResult))
+
+/**
+ * Get the path of the running application binary and store it in aResult.
+ * @param aArgv0  The value passed as argv[0] of main(). This value is only
+ *                used on *nix, and only when other methods of determining
+ *                the binary path have failed.
+ */
+XRE_API(nsresult,
+        XRE_GetBinaryPath, (const char* aArgv0, nsIFile** aResult))
+
+/**
+ * Get the static module built in to libxul.
+ */
+XRE_API(const mozilla::Module*,
+        XRE_GetStaticModule, ())
+
+/**
+ * Lock a profile directory using platform-specific semantics.
+ *
+ * @param aDirectory  The profile directory to lock.
+ * @param aLockObject An opaque lock object. The directory will remain locked
+ *                    as long as the XPCOM reference is held.
+ */
+XRE_API(nsresult,
+        XRE_LockProfileDirectory, (nsIFile* aDirectory,
+                                   nsISupports** aLockObject))
+
+/**
+ * Initialize libXUL for embedding purposes.
+ *
+ * @param aLibXULDirectory   The directory in which the libXUL shared library
+ *                           was found.
+ * @param aAppDirectory      The directory in which the application components
+ *                           and resources can be found. This will map to
+ *                           the NS_OS_CURRENT_PROCESS_DIR directory service
+ *                           key.
+ * @param aAppDirProvider    A directory provider for the application. This
+ *                           provider will be aggregated by a libxul provider
+ *                           which will provide the base required GRE keys.
+ *
+ * @note This function must be called from the "main" thread.
+ *
+ * @note At the present time, this function may only be called once in
+ * a given process. Use XRE_TermEmbedding to clean up and free
+ * resources allocated by XRE_InitEmbedding.
+ */
+
+XRE_API(nsresult,
+        XRE_InitEmbedding2, (nsIFile* aLibXULDirectory,
+                             nsIFile* aAppDirectory,
+                             nsIDirectoryServiceProvider* aAppDirProvider))
+
+/**
+ * Register static XPCOM component information.
+ * This method may be called at any time before or after XRE_main or
+ * XRE_InitEmbedding.
+ */
+XRE_API(nsresult,
+        XRE_AddStaticComponent, (const mozilla::Module* aComponent))
+
+/**
+ * Register XPCOM components found in an array of files/directories.
+ * This method may be called at any time before or after XRE_main or
+ * XRE_InitEmbedding.
+ *
+ * @param aFiles An array of files or directories.
+ * @param aFileCount the number of items in the aFiles array.
+ * @note appdir/components is registered automatically.
+ *
+ * NS_APP_LOCATION specifies a location to search for binary XPCOM
+ * components as well as component/chrome manifest files.
+ *
+ * NS_EXTENSION_LOCATION excludes binary XPCOM components but allows other
+ * manifest instructions.
+ *
+ * NS_SKIN_LOCATION specifies a location to search for chrome manifest files
+ * which are only allowed to register only skin packages and style overlays.
+ */
+enum NSLocationType
+{
+  NS_APP_LOCATION,
+  NS_EXTENSION_LOCATION,
+  NS_SKIN_LOCATION,
+  NS_BOOTSTRAPPED_LOCATION
+};
+
+XRE_API(nsresult,
+        XRE_AddManifestLocation, (NSLocationType aType,
+                                  nsIFile* aLocation))
+
+/**
+ * Register XPCOM components found in a JAR.
+ * This is similar to XRE_AddManifestLocation except the file specified
+ * must be a zip archive with a manifest named chrome.manifest
+ * This method may be called at any time before or after XRE_main or
+ * XRE_InitEmbedding.
+ *
+ * @param aFiles An array of files or directories.
+ * @param aFileCount the number of items in the aFiles array.
+ * @note appdir/components is registered automatically.
+ *
+ * NS_COMPONENT_LOCATION specifies a location to search for binary XPCOM
+ * components as well as component/chrome manifest files.
+ *
+ * NS_SKIN_LOCATION specifies a location to search for chrome manifest files
+ * which are only allowed to register only skin packages and style overlays.
+ */
+XRE_API(nsresult,
+        XRE_AddJarManifestLocation, (NSLocationType aType,
+                                     nsIFile* aLocation))
+
+/**
+ * Fire notifications to inform the toolkit about a new profile. This
+ * method should be called after XRE_InitEmbedding if the embedder
+ * wishes to run with a profile. Normally the embedder should call
+ * XRE_LockProfileDirectory to lock the directory before calling this
+ * method.
+ *
+ * @note There are two possibilities for selecting a profile:
+ *
+ * 1) Select the profile before calling XRE_InitEmbedding. The aAppDirProvider
+ *    object passed to XRE_InitEmbedding should provide the
+ *    NS_APP_USER_PROFILE_50_DIR key, and may also provide the following keys:
+ *    - NS_APP_USER_PROFILE_LOCAL_50_DIR
+ *    - NS_APP_PROFILE_DIR_STARTUP
+ *    - NS_APP_PROFILE_LOCAL_DIR_STARTUP
+ *    In this scenario XRE_NotifyProfile should be called immediately after
+ *    XRE_InitEmbedding. Component registration information will be stored in
+ *    the profile and JS components may be stored in the fastload cache.
+ *
+ * 2) Select a profile some time after calling XRE_InitEmbedding. In this case
+ *    the embedder must install a directory service provider which provides
+ *    NS_APP_USER_PROFILE_50_DIR and optionally
+ *    NS_APP_USER_PROFILE_LOCAL_50_DIR. Component registration information
+ *    will be stored in the application directory and JS components will not
+ *    fastload.
+ */
+XRE_API(void,
+        XRE_NotifyProfile, ())
+
+/**
+ * Terminate embedding started with XRE_InitEmbedding or XRE_InitEmbedding2
+ */
+XRE_API(void,
+        XRE_TermEmbedding, ())
+
+/**
+ * Create a new nsXREAppData structure from an application.ini file.
+ *
+ * @param aINIFile The application.ini file to parse.
+ * @param aAppData A newly-allocated nsXREAppData structure. The caller is
+ *                 responsible for freeing this structure using
+ *                 XRE_FreeAppData.
+ */
+XRE_API(nsresult,
+        XRE_CreateAppData, (nsIFile* aINIFile,
+                            nsXREAppData** aAppData))
+
+/**
+ * Parse an INI file (application.ini or override.ini) into an existing
+ * nsXREAppData structure.
+ *
+ * @param aINIFile The INI file to parse
+ * @param aAppData The nsXREAppData structure to fill.
+ */
+XRE_API(nsresult,
+        XRE_ParseAppData, (nsIFile* aINIFile,
+                           nsXREAppData* aAppData))
+
+/**
+ * Free a nsXREAppData structure that was allocated with XRE_CreateAppData.
+ */
+XRE_API(void,
+        XRE_FreeAppData, (nsXREAppData* aAppData))
+
+enum GeckoProcessType
+{
+  GeckoProcessType_Default = 0,
+
+  GeckoProcessType_Plugin,
+  GeckoProcessType_Content,
+
+  GeckoProcessType_IPDLUnitTest,
+
+  GeckoProcessType_GMPlugin, // Gecko Media Plugin
+
+  GeckoProcessType_GPU,      // GPU and compositor process
+
+  GeckoProcessType_End,
+  GeckoProcessType_Invalid = GeckoProcessType_End
+};
+
+static const char* const kGeckoProcessTypeString[] = {
+  "default",
+  "plugin",
+  "tab",
+  "ipdlunittest",
+  "geckomediaplugin",
+  "gpu"
+};
+
+static_assert(MOZ_ARRAY_LENGTH(kGeckoProcessTypeString) ==
+              GeckoProcessType_End,
+              "Array length mismatch");
+
+XRE_API(const char*,
+        XRE_ChildProcessTypeToString, (GeckoProcessType aProcessType))
+
+XRE_API(void,
+        XRE_SetProcessType, (const char* aProcessTypeString))
+
+#if defined(MOZ_CRASHREPORTER)
+// Used in the "master" parent process hosting the crash server
+XRE_API(bool,
+        XRE_TakeMinidumpForChild, (uint32_t aChildPid, nsIFile** aDump,
+                                   uint32_t* aSequence))
+
+// Used in child processes.
+XRE_API(bool,
+        XRE_SetRemoteExceptionHandler, (const char* aPipe))
+#endif
+
+namespace mozilla {
+namespace gmp {
+class GMPLoader;
+} // namespace gmp
+} // namespace mozilla
+
+XRE_API(nsresult,
+        XRE_InitChildProcess, (int aArgc,
+                               char* aArgv[],
+                               const XREChildData* aChildData))
+
+XRE_API(GeckoProcessType,
+        XRE_GetProcessType, ())
+
+XRE_API(bool,
+        XRE_IsParentProcess, ())
+
+XRE_API(bool,
+        XRE_IsContentProcess, ())
+
+XRE_API(bool,
+        XRE_IsGPUProcess, ())
+
+typedef void (*MainFunction)(void* aData);
+
+XRE_API(nsresult,
+        XRE_InitParentProcess, (int aArgc,
+                                char* aArgv[],
+                                MainFunction aMainFunction,
+                                void* aMainFunctionExtraData))
+
+XRE_API(int,
+        XRE_RunIPDLTest, (int aArgc,
+                          char* aArgv[]))
+
+XRE_API(nsresult,
+        XRE_RunAppShell, ())
+
+XRE_API(nsresult,
+        XRE_InitCommandLine, (int aArgc, char* aArgv[]))
+
+XRE_API(nsresult,
+        XRE_DeinitCommandLine, ())
+
+class MessageLoop;
+
+XRE_API(void,
+        XRE_ShutdownChildProcess, ())
+
+XRE_API(MessageLoop*,
+        XRE_GetIOMessageLoop, ())
+
+XRE_API(bool,
+        XRE_SendTestShellCommand, (JSContext* aCx,
+                                   JSString* aCommand,
+                                   void* aCallback))
+XRE_API(bool,
+        XRE_ShutdownTestShell, ())
+
+XRE_API(void,
+        XRE_InstallX11ErrorHandler, ())
+
+XRE_API(void,
+        XRE_TelemetryAccumulate, (int aID, uint32_t aSample))
+
+XRE_API(void,
+        XRE_StartupTimelineRecord, (int aEvent, mozilla::TimeStamp aWhen))
+
+XRE_API(void,
+        XRE_InitOmnijar, (nsIFile* aGreOmni,
+                          nsIFile* aAppOmni))
+XRE_API(void,
+        XRE_StopLateWriteChecks, (void))
+
+XRE_API(void,
+        XRE_EnableSameExecutableForContentProc, ())
+
+XRE_API(int,
+        XRE_XPCShellMain, (int argc, char** argv, char** envp,
+                           const XREShellData* aShellData))
+
+#if MOZ_WIDGET_GTK == 2
+XRE_API(void,
+        XRE_GlibInit, ())
+#endif
+
+
+#ifdef LIBFUZZER
+#include "LibFuzzerRegistry.h"
+
+XRE_API(void,
+        XRE_LibFuzzerSetMain, (int, char**, LibFuzzerMain))
+
+XRE_API(void,
+        XRE_LibFuzzerGetFuncs, (const char*, LibFuzzerInitFunc*,
+                                LibFuzzerTestingFunc*))
+#endif // LIBFUZZER
+
+#endif // _nsXULAppAPI_h__
diff --git a/xpcom/build/perfprobe.cpp b/xpcom/build/perfprobe.cpp
new file mode 100644
index 0000000000..118e73fc8c
--- /dev/null
+++ b/xpcom/build/perfprobe.cpp
@@ -0,0 +1,242 @@
+/* -*- 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/. */
+
+/*****************************
+ Windows implementation of probes, using xperf
+ *****************************/
+#include <windows.h>
+#include <wmistr.h>
+#include <evntrace.h>
+
+#include "perfprobe.h"
+#include "nsAutoPtr.h"
+
+namespace mozilla {
+namespace probes {
+
+#if defined(MOZ_LOGGING)
+static LazyLogModule sProbeLog("SysProbe");
+#define LOG(x) MOZ_LOG(sProbeLog, mozilla::LogLevel::Debug, x)
+#else
+#define LOG(x)
+#endif
+
+// Utility function
+GUID
+CID_to_GUID(const nsCID& aCID)
+{
+  GUID result;
+  result.Data1 = aCID.m0;
+  result.Data2 = aCID.m1;
+  result.Data3 = aCID.m2;
+  for (int i = 0; i < 8; ++i) {
+    result.Data4[i] = aCID.m3[i];
+  }
+  return result;
+}
+
+
+// Implementation of Probe
+
+Probe::Probe(const nsCID& aGUID,
+             const nsACString& aName,
+             ProbeManager* aManager)
+  : mGUID(CID_to_GUID(aGUID))
+  , mName(aName)
+  , mManager(aManager)
+{
+}
+
+nsresult
+Probe::Trigger()
+{
+  if (!(mManager->mIsActive)) {
+    //Do not trigger if there is no session
+    return NS_OK;
+  }
+
+  _EVENT_TRACE_HEADER event;
+  ZeroMemory(&event, sizeof(event));
+  event.Size = sizeof(event);
+  event.Flags = WNODE_FLAG_TRACED_GUID ;
+  event.Guid = (const GUID)mGUID;
+  event.Class.Type    = 1;
+  event.Class.Version = 0;
+  event.Class.Level   = TRACE_LEVEL_INFORMATION;
+
+  ULONG result        = TraceEvent(mManager->mSessionHandle, &event);
+
+  LOG(("Probes: Triggered %s, %s, %ld",
+       mName.Data(),
+       result == ERROR_SUCCESS ? "success" : "failure",
+       result));
+
+  nsresult rv;
+  switch (result) {
+    case ERROR_SUCCESS:
+      rv = NS_OK;
+      break;
+    case ERROR_INVALID_FLAG_NUMBER:
+    case ERROR_MORE_DATA:
+    case ERROR_INVALID_PARAMETER:
+      rv = NS_ERROR_INVALID_ARG;
+      break;
+    case ERROR_INVALID_HANDLE:
+      rv = NS_ERROR_FAILURE;
+      break;
+    case ERROR_NOT_ENOUGH_MEMORY:
+    case ERROR_OUTOFMEMORY:
+      rv = NS_ERROR_OUT_OF_MEMORY;
+      break;
+    default:
+      rv = NS_ERROR_UNEXPECTED;
+  }
+  return rv;
+}
+
+
+// Implementation of ProbeManager
+
+ProbeManager::~ProbeManager()
+{
+  //If the manager goes out of scope, stop the session.
+  if (mIsActive && mRegistrationHandle) {
+    StopSession();
+  }
+}
+
+ProbeManager::ProbeManager(const nsCID& aApplicationUID,
+                           const nsACString& aApplicationName)
+  : mIsActive(false)
+  , mApplicationUID(aApplicationUID)
+  , mApplicationName(aApplicationName)
+  , mSessionHandle(0)
+  , mRegistrationHandle(0)
+  , mInitialized(false)
+{
+#if defined(MOZ_LOGGING)
+  char cidStr[NSID_LENGTH];
+  aApplicationUID.ToProvidedString(cidStr);
+  LOG(("ProbeManager::Init for application %s, %s",
+       aApplicationName.Data(), cidStr));
+#endif
+}
+
+//Note: The Windows API is just a little bit scary there.
+//The only way to obtain the session handle is to
+//- ignore the session handle obtained from RegisterTraceGuids
+//- pass a callback
+//- in that callback, request the session handle through
+//      GetTraceLoggerHandle and some opaque value received by the callback
+
+ULONG WINAPI
+ControlCallback(WMIDPREQUESTCODE aRequestCode,
+                PVOID aContext,
+                ULONG* aReserved,
+                PVOID aBuffer)
+{
+  ProbeManager* context = (ProbeManager*)aContext;
+  switch (aRequestCode) {
+    case WMI_ENABLE_EVENTS: {
+      context->mIsActive = true;
+      TRACEHANDLE sessionHandle = GetTraceLoggerHandle(aBuffer);
+      //Note: We only accept one handle
+      if ((HANDLE)sessionHandle == INVALID_HANDLE_VALUE) {
+        ULONG result = GetLastError();
+        LOG(("Probes: ControlCallback failed, %ul", result));
+        return result;
+      } else if (context->mIsActive && context->mSessionHandle &&
+                 context->mSessionHandle != sessionHandle) {
+        LOG(("Probes: Can only handle one context at a time, "
+             "ignoring activation"));
+        return ERROR_SUCCESS;
+      } else {
+        context->mSessionHandle = sessionHandle;
+        LOG(("Probes: ControlCallback activated"));
+        return ERROR_SUCCESS;
+      }
+    }
+
+    case WMI_DISABLE_EVENTS:
+      context->mIsActive      = false;
+      context->mSessionHandle = 0;
+      LOG(("Probes: ControlCallback deactivated"));
+      return ERROR_SUCCESS;
+
+    default:
+      LOG(("Probes: ControlCallback does not know what to do with %d",
+           aRequestCode));
+      return ERROR_INVALID_PARAMETER;
+  }
+}
+
+already_AddRefed<Probe>
+ProbeManager::GetProbe(const nsCID& aEventUID, const nsACString& aEventName)
+{
+  RefPtr<Probe> result(new Probe(aEventUID, aEventName, this));
+  mAllProbes.AppendElement(result);
+  return result.forget();
+}
+
+nsresult
+ProbeManager::StartSession()
+{
+  return StartSession(mAllProbes);
+}
+
+nsresult
+ProbeManager::StartSession(nsTArray<RefPtr<Probe>>& aProbes)
+{
+  const size_t probesCount = aProbes.Length();
+  _TRACE_GUID_REGISTRATION* probes = new _TRACE_GUID_REGISTRATION[probesCount];
+  for (unsigned int i = 0; i < probesCount; ++i) {
+    const Probe* probe = aProbes[i];
+    const Probe* probeX = static_cast<const Probe*>(probe);
+    probes[i].Guid = (LPCGUID)&probeX->mGUID;
+  }
+  ULONG result =
+    RegisterTraceGuids(&ControlCallback
+                       /*RequestAddress: Sets mSessions appropriately.*/,
+                       this
+                       /*RequestContext: Passed to ControlCallback*/,
+                       (LPGUID)&mApplicationUID
+                       /*ControlGuid:    Tracing GUID
+                        the cast comes from MSDN examples*/,
+                       probesCount
+                       /*GuidCount:      Number of probes*/,
+                       probes
+                       /*TraceGuidReg:   Probes registration*/,
+                       nullptr
+                       /*MofImagePath:   Must be nullptr, says MSDN*/,
+                       nullptr
+                       /*MofResourceName:Must be nullptr, says MSDN*/,
+                       &mRegistrationHandle
+                       /*RegistrationHandle: Handler.
+                        used only for unregistration*/
+                      );
+  delete[] probes;
+  if (NS_WARN_IF(result != ERROR_SUCCESS)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+  return NS_OK;
+}
+
+nsresult
+ProbeManager::StopSession()
+{
+  LOG(("Probes: Stopping measures"));
+  if (mSessionHandle != 0) {
+    ULONG result = UnregisterTraceGuids(mSessionHandle);
+    mSessionHandle = 0;
+    if (result != ERROR_SUCCESS) {
+      return NS_ERROR_INVALID_ARG;
+    }
+  }
+  return NS_OK;
+}
+
+} // namespace probes
+} // namespace mozilla
diff --git a/xpcom/build/perfprobe.h b/xpcom/build/perfprobe.h
new file mode 100644
index 0000000000..bc3563654b
--- /dev/null
+++ b/xpcom/build/perfprobe.h
@@ -0,0 +1,204 @@
+/* -*- 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/. */
+
+/**
+ * A mechanism for interacting with operating system-provided
+ * debugging/profiling tools such as Microsoft EWT/Windows Performance Toolkit.
+ */
+
+#ifndef mozilla_perfprobe_h
+#define mozilla_perfprobe_h
+
+#if !defined(XP_WIN)
+#error "For the moment, perfprobe.h is defined only for Windows platforms"
+#endif
+
+#include "nsError.h"
+#include "nsString.h"
+#include "mozilla/Logging.h"
+#include "nsTArray.h"
+#include "nsAutoPtr.h"
+#include <windows.h>
+#undef GetStartupInfo //Prevent Windows from polluting global namespace
+#include <wmistr.h>
+#include <evntrace.h>
+
+namespace mozilla {
+namespace probes {
+
+class ProbeManager;
+
+/**
+ * A data structure supporting a trigger operation that can be used to
+ * send information to the operating system.
+ */
+
+class Probe
+{
+public:
+  NS_INLINE_DECL_REFCOUNTING(Probe)
+
+  /**
+   * Trigger the event.
+   *
+   * Note: Can be called from any thread.
+   */
+  nsresult Trigger();
+
+protected:
+  ~Probe() {};
+
+  Probe(const nsCID& aGUID, const nsACString& aName, ProbeManager* aManager);
+  friend class ProbeManager;
+
+protected:
+
+  /**
+   * The system GUID associated to this probe. See the documentation
+   * of |ProbeManager::Make| for more details.
+   */
+  const GUID mGUID;
+
+  /**
+   * The name of this probe. See the documentation
+   * of |ProbeManager::Make| for more details.
+   */
+  const nsCString mName;
+
+  /**
+   * The ProbeManager managing this probe.
+   *
+   * Note: This is a weak reference to avoid a useless cycle.
+   */
+  class ProbeManager* mManager;
+};
+
+
+/**
+ * A manager for a group of probes.
+ *
+ * You can have several managers in one application, provided that they all
+ * have distinct IDs and names. However, having more than 2 is considered a bad
+ * practice.
+ */
+class ProbeManager
+{
+public:
+  NS_INLINE_DECL_REFCOUNTING(ProbeManager)
+
+  /**
+   * Create a new probe manager.
+   *
+   * This constructor should be called from the main thread.
+   *
+   * @param aApplicationUID The unique ID of the probe. Under Windows, this
+   * unique ID must have been previously registered using an external tool.
+   * See MyCategory on http://msdn.microsoft.com/en-us/library/aa364100.aspx
+   * @param aApplicationName A name for the probe. Currently used only for
+   * logging purposes. In the future, may be attached to the data sent to the
+   * operating system.
+   *
+   * Note: If two ProbeManagers are constructed with the same uid and/or name,
+   * behavior is unspecified.
+   */
+  ProbeManager(const nsCID& aApplicationUID,
+               const nsACString& aApplicationName);
+
+  /**
+   * Acquire a probe.
+   *
+   * Note: Only probes acquired before the call to SetReady are taken into
+   * account
+   * Note: Can be called only from the main thread.
+   *
+   * @param aEventUID The unique ID of the probe. Under Windows, this unique
+   * ID must have been previously registered using an external tool.
+   * See MyCategory on http://msdn.microsoft.com/en-us/library/aa364100.aspx
+   * @param aEventName A name for the probe. Currently used only for logging
+   * purposes. In the
+   * future, may be attached to the data sent to the operating system.
+   * @return Either |null| in case of error or a valid |Probe*|.
+   *
+   * Note: If this method is called twice with the same uid and/or name,
+   * behavior is undefined.
+   */
+  already_AddRefed<Probe> GetProbe(const nsCID& aEventUID,
+                                   const nsACString& aEventName);
+
+  /**
+   * Start/stop the measuring session.
+   *
+   * This method should be called from the main thread.
+   *
+   * Note that starting an already started probe manager has no effect,
+   * nor does stopping an already stopped probe manager.
+   */
+  nsresult StartSession();
+  nsresult StopSession();
+
+  /**
+   * @return true If measures are currently on, i.e. if triggering probes is any
+   * is useful. You do not have to check this before triggering a probe, unless
+   * this can avoid complex computations.
+   */
+  bool IsActive();
+
+protected:
+  ~ProbeManager();
+
+  nsresult StartSession(nsTArray<RefPtr<Probe>>& aProbes);
+  nsresult Init(const nsCID& aApplicationUID,
+                const nsACString& aApplicationName);
+
+protected:
+  /**
+   * `true` if a session is in activity, `false` otherwise.
+   */
+  bool mIsActive;
+
+  /**
+   * The UID of this manager.
+   * See documentation above for registration steps that you
+   * may have to take.
+   */
+  nsCID mApplicationUID;
+
+  /**
+   * The name of the application.
+   */
+  nsCString mApplicationName;
+
+  /**
+   * All the probes that have been created for this manager.
+   */
+  nsTArray<RefPtr<Probe>> mAllProbes;
+
+  /**
+   * Handle used for triggering events
+   */
+  TRACEHANDLE mSessionHandle;
+
+  /**
+   * Handle used for registration/unregistration
+   */
+  TRACEHANDLE mRegistrationHandle;
+
+  /**
+   * `true` if initialization has been performed, `false` until then.
+   */
+  bool mInitialized;
+
+  friend class Probe;  // Needs to access |mSessionHandle|
+  friend ULONG WINAPI ControlCallback(WMIDPREQUESTCODE aRequestCode,
+                                      PVOID aContext,
+                                      ULONG* aReserved,
+                                      PVOID aBuffer);  // Sets |mSessionHandle|
+};
+
+} // namespace probes
+} // namespace mozilla
+
+#endif //mozilla_perfprobe_h
diff --git a/xpcom/build/xpcom_alpha.def b/xpcom/build/xpcom_alpha.def
new file mode 100644
index 0000000000..38fedfa17f
--- /dev/null
+++ b/xpcom/build/xpcom_alpha.def
@@ -0,0 +1,256 @@
+;+# 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/.
+
+LIBRARY xpcom
+DESCRIPTION "xpcom library"
+
+EXPORTS
+    ?Stub3@nsXPTCStubBase@@UAAIXZ
+    ?Stub4@nsXPTCStubBase@@UAAIXZ
+    ?Stub5@nsXPTCStubBase@@UAAIXZ
+    ?Stub6@nsXPTCStubBase@@UAAIXZ
+    ?Stub7@nsXPTCStubBase@@UAAIXZ
+    ?Stub8@nsXPTCStubBase@@UAAIXZ
+    ?Stub9@nsXPTCStubBase@@UAAIXZ
+    ?Stub10@nsXPTCStubBase@@UAAIXZ
+    ?Stub11@nsXPTCStubBase@@UAAIXZ
+    ?Stub12@nsXPTCStubBase@@UAAIXZ
+    ?Stub13@nsXPTCStubBase@@UAAIXZ
+    ?Stub14@nsXPTCStubBase@@UAAIXZ
+    ?Stub15@nsXPTCStubBase@@UAAIXZ
+    ?Stub16@nsXPTCStubBase@@UAAIXZ
+    ?Stub17@nsXPTCStubBase@@UAAIXZ
+    ?Stub18@nsXPTCStubBase@@UAAIXZ
+    ?Stub19@nsXPTCStubBase@@UAAIXZ
+    ?Stub20@nsXPTCStubBase@@UAAIXZ
+    ?Stub21@nsXPTCStubBase@@UAAIXZ
+    ?Stub22@nsXPTCStubBase@@UAAIXZ
+    ?Stub23@nsXPTCStubBase@@UAAIXZ
+    ?Stub24@nsXPTCStubBase@@UAAIXZ
+    ?Stub25@nsXPTCStubBase@@UAAIXZ
+    ?Stub26@nsXPTCStubBase@@UAAIXZ
+    ?Stub27@nsXPTCStubBase@@UAAIXZ
+    ?Stub28@nsXPTCStubBase@@UAAIXZ
+    ?Stub29@nsXPTCStubBase@@UAAIXZ
+    ?Stub30@nsXPTCStubBase@@UAAIXZ
+    ?Stub31@nsXPTCStubBase@@UAAIXZ
+    ?Stub32@nsXPTCStubBase@@UAAIXZ
+    ?Stub33@nsXPTCStubBase@@UAAIXZ
+    ?Stub34@nsXPTCStubBase@@UAAIXZ
+    ?Stub35@nsXPTCStubBase@@UAAIXZ
+    ?Stub36@nsXPTCStubBase@@UAAIXZ
+    ?Stub37@nsXPTCStubBase@@UAAIXZ
+    ?Stub38@nsXPTCStubBase@@UAAIXZ
+    ?Stub39@nsXPTCStubBase@@UAAIXZ
+    ?Stub40@nsXPTCStubBase@@UAAIXZ
+    ?Stub41@nsXPTCStubBase@@UAAIXZ
+    ?Stub42@nsXPTCStubBase@@UAAIXZ
+    ?Stub43@nsXPTCStubBase@@UAAIXZ
+    ?Stub44@nsXPTCStubBase@@UAAIXZ
+    ?Stub45@nsXPTCStubBase@@UAAIXZ
+    ?Stub46@nsXPTCStubBase@@UAAIXZ
+    ?Stub47@nsXPTCStubBase@@UAAIXZ
+    ?Stub48@nsXPTCStubBase@@UAAIXZ
+    ?Stub49@nsXPTCStubBase@@UAAIXZ
+    ?Stub50@nsXPTCStubBase@@UAAIXZ
+    ?Stub51@nsXPTCStubBase@@UAAIXZ
+    ?Stub52@nsXPTCStubBase@@UAAIXZ
+    ?Stub53@nsXPTCStubBase@@UAAIXZ
+    ?Stub54@nsXPTCStubBase@@UAAIXZ
+    ?Stub55@nsXPTCStubBase@@UAAIXZ
+    ?Stub56@nsXPTCStubBase@@UAAIXZ
+    ?Stub57@nsXPTCStubBase@@UAAIXZ
+    ?Stub58@nsXPTCStubBase@@UAAIXZ
+    ?Stub59@nsXPTCStubBase@@UAAIXZ
+    ?Stub60@nsXPTCStubBase@@UAAIXZ
+    ?Stub61@nsXPTCStubBase@@UAAIXZ
+    ?Stub62@nsXPTCStubBase@@UAAIXZ
+    ?Stub63@nsXPTCStubBase@@UAAIXZ
+    ?Stub64@nsXPTCStubBase@@UAAIXZ
+    ?Stub65@nsXPTCStubBase@@UAAIXZ
+    ?Stub66@nsXPTCStubBase@@UAAIXZ
+    ?Stub67@nsXPTCStubBase@@UAAIXZ
+    ?Stub68@nsXPTCStubBase@@UAAIXZ
+    ?Stub69@nsXPTCStubBase@@UAAIXZ
+    ?Stub70@nsXPTCStubBase@@UAAIXZ
+    ?Stub71@nsXPTCStubBase@@UAAIXZ
+    ?Stub72@nsXPTCStubBase@@UAAIXZ
+    ?Stub73@nsXPTCStubBase@@UAAIXZ
+    ?Stub74@nsXPTCStubBase@@UAAIXZ
+    ?Stub75@nsXPTCStubBase@@UAAIXZ
+    ?Stub76@nsXPTCStubBase@@UAAIXZ
+    ?Stub77@nsXPTCStubBase@@UAAIXZ
+    ?Stub78@nsXPTCStubBase@@UAAIXZ
+    ?Stub79@nsXPTCStubBase@@UAAIXZ
+    ?Stub80@nsXPTCStubBase@@UAAIXZ
+    ?Stub81@nsXPTCStubBase@@UAAIXZ
+    ?Stub82@nsXPTCStubBase@@UAAIXZ
+    ?Stub83@nsXPTCStubBase@@UAAIXZ
+    ?Stub84@nsXPTCStubBase@@UAAIXZ
+    ?Stub85@nsXPTCStubBase@@UAAIXZ
+    ?Stub86@nsXPTCStubBase@@UAAIXZ
+    ?Stub87@nsXPTCStubBase@@UAAIXZ
+    ?Stub88@nsXPTCStubBase@@UAAIXZ
+    ?Stub89@nsXPTCStubBase@@UAAIXZ
+    ?Stub90@nsXPTCStubBase@@UAAIXZ
+    ?Stub91@nsXPTCStubBase@@UAAIXZ
+    ?Stub92@nsXPTCStubBase@@UAAIXZ
+    ?Stub93@nsXPTCStubBase@@UAAIXZ
+    ?Stub94@nsXPTCStubBase@@UAAIXZ
+    ?Stub95@nsXPTCStubBase@@UAAIXZ
+    ?Stub96@nsXPTCStubBase@@UAAIXZ
+    ?Stub97@nsXPTCStubBase@@UAAIXZ
+    ?Stub98@nsXPTCStubBase@@UAAIXZ
+    ?Stub99@nsXPTCStubBase@@UAAIXZ
+    ?Stub100@nsXPTCStubBase@@UAAIXZ
+    ?Stub101@nsXPTCStubBase@@UAAIXZ
+    ?Stub102@nsXPTCStubBase@@UAAIXZ
+    ?Stub103@nsXPTCStubBase@@UAAIXZ
+    ?Stub104@nsXPTCStubBase@@UAAIXZ
+    ?Stub105@nsXPTCStubBase@@UAAIXZ
+    ?Stub106@nsXPTCStubBase@@UAAIXZ
+    ?Stub107@nsXPTCStubBase@@UAAIXZ
+    ?Stub108@nsXPTCStubBase@@UAAIXZ
+    ?Stub109@nsXPTCStubBase@@UAAIXZ
+    ?Stub110@nsXPTCStubBase@@UAAIXZ
+    ?Stub111@nsXPTCStubBase@@UAAIXZ
+    ?Stub112@nsXPTCStubBase@@UAAIXZ
+    ?Stub113@nsXPTCStubBase@@UAAIXZ
+    ?Stub114@nsXPTCStubBase@@UAAIXZ
+    ?Stub115@nsXPTCStubBase@@UAAIXZ
+    ?Stub116@nsXPTCStubBase@@UAAIXZ
+    ?Stub117@nsXPTCStubBase@@UAAIXZ
+    ?Stub118@nsXPTCStubBase@@UAAIXZ
+    ?Stub119@nsXPTCStubBase@@UAAIXZ
+    ?Stub120@nsXPTCStubBase@@UAAIXZ
+    ?Stub121@nsXPTCStubBase@@UAAIXZ
+    ?Stub122@nsXPTCStubBase@@UAAIXZ
+    ?Stub123@nsXPTCStubBase@@UAAIXZ
+    ?Stub124@nsXPTCStubBase@@UAAIXZ
+    ?Stub125@nsXPTCStubBase@@UAAIXZ
+    ?Stub126@nsXPTCStubBase@@UAAIXZ
+    ?Stub127@nsXPTCStubBase@@UAAIXZ
+    ?Stub128@nsXPTCStubBase@@UAAIXZ
+    ?Stub129@nsXPTCStubBase@@UAAIXZ
+    ?Stub130@nsXPTCStubBase@@UAAIXZ
+    ?Stub131@nsXPTCStubBase@@UAAIXZ
+    ?Stub132@nsXPTCStubBase@@UAAIXZ
+    ?Stub133@nsXPTCStubBase@@UAAIXZ
+    ?Stub134@nsXPTCStubBase@@UAAIXZ
+    ?Stub135@nsXPTCStubBase@@UAAIXZ
+    ?Stub136@nsXPTCStubBase@@UAAIXZ
+    ?Stub137@nsXPTCStubBase@@UAAIXZ
+    ?Stub138@nsXPTCStubBase@@UAAIXZ
+    ?Stub139@nsXPTCStubBase@@UAAIXZ
+    ?Stub140@nsXPTCStubBase@@UAAIXZ
+    ?Stub141@nsXPTCStubBase@@UAAIXZ
+    ?Stub142@nsXPTCStubBase@@UAAIXZ
+    ?Stub143@nsXPTCStubBase@@UAAIXZ
+    ?Stub144@nsXPTCStubBase@@UAAIXZ
+    ?Stub145@nsXPTCStubBase@@UAAIXZ
+    ?Stub146@nsXPTCStubBase@@UAAIXZ
+    ?Stub147@nsXPTCStubBase@@UAAIXZ
+    ?Stub148@nsXPTCStubBase@@UAAIXZ
+    ?Stub149@nsXPTCStubBase@@UAAIXZ
+    ?Stub150@nsXPTCStubBase@@UAAIXZ
+    ?Stub151@nsXPTCStubBase@@UAAIXZ
+    ?Stub152@nsXPTCStubBase@@UAAIXZ
+    ?Stub153@nsXPTCStubBase@@UAAIXZ
+    ?Stub154@nsXPTCStubBase@@UAAIXZ
+    ?Stub155@nsXPTCStubBase@@UAAIXZ
+    ?Stub156@nsXPTCStubBase@@UAAIXZ
+    ?Stub157@nsXPTCStubBase@@UAAIXZ
+    ?Stub158@nsXPTCStubBase@@UAAIXZ
+    ?Stub159@nsXPTCStubBase@@UAAIXZ
+    ?Stub160@nsXPTCStubBase@@UAAIXZ
+    ?Stub161@nsXPTCStubBase@@UAAIXZ
+    ?Stub162@nsXPTCStubBase@@UAAIXZ
+    ?Stub163@nsXPTCStubBase@@UAAIXZ
+    ?Stub164@nsXPTCStubBase@@UAAIXZ
+    ?Stub165@nsXPTCStubBase@@UAAIXZ
+    ?Stub166@nsXPTCStubBase@@UAAIXZ
+    ?Stub167@nsXPTCStubBase@@UAAIXZ
+    ?Stub168@nsXPTCStubBase@@UAAIXZ
+    ?Stub169@nsXPTCStubBase@@UAAIXZ
+    ?Stub170@nsXPTCStubBase@@UAAIXZ
+    ?Stub171@nsXPTCStubBase@@UAAIXZ
+    ?Stub172@nsXPTCStubBase@@UAAIXZ
+    ?Stub173@nsXPTCStubBase@@UAAIXZ
+    ?Stub174@nsXPTCStubBase@@UAAIXZ
+    ?Stub175@nsXPTCStubBase@@UAAIXZ
+    ?Stub176@nsXPTCStubBase@@UAAIXZ
+    ?Stub177@nsXPTCStubBase@@UAAIXZ
+    ?Stub178@nsXPTCStubBase@@UAAIXZ
+    ?Stub179@nsXPTCStubBase@@UAAIXZ
+    ?Stub180@nsXPTCStubBase@@UAAIXZ
+    ?Stub181@nsXPTCStubBase@@UAAIXZ
+    ?Stub182@nsXPTCStubBase@@UAAIXZ
+    ?Stub183@nsXPTCStubBase@@UAAIXZ
+    ?Stub184@nsXPTCStubBase@@UAAIXZ
+    ?Stub185@nsXPTCStubBase@@UAAIXZ
+    ?Stub186@nsXPTCStubBase@@UAAIXZ
+    ?Stub187@nsXPTCStubBase@@UAAIXZ
+    ?Stub188@nsXPTCStubBase@@UAAIXZ
+    ?Stub189@nsXPTCStubBase@@UAAIXZ
+    ?Stub190@nsXPTCStubBase@@UAAIXZ
+    ?Stub191@nsXPTCStubBase@@UAAIXZ
+    ?Stub192@nsXPTCStubBase@@UAAIXZ
+    ?Stub193@nsXPTCStubBase@@UAAIXZ
+    ?Stub194@nsXPTCStubBase@@UAAIXZ
+    ?Stub195@nsXPTCStubBase@@UAAIXZ
+    ?Stub196@nsXPTCStubBase@@UAAIXZ
+    ?Stub197@nsXPTCStubBase@@UAAIXZ
+    ?Stub198@nsXPTCStubBase@@UAAIXZ
+    ?Stub199@nsXPTCStubBase@@UAAIXZ
+    ?Stub200@nsXPTCStubBase@@UAAIXZ
+    ?Stub201@nsXPTCStubBase@@UAAIXZ
+    ?Stub202@nsXPTCStubBase@@UAAIXZ
+    ?Stub203@nsXPTCStubBase@@UAAIXZ
+    ?Stub204@nsXPTCStubBase@@UAAIXZ
+    ?Stub205@nsXPTCStubBase@@UAAIXZ
+    ?Stub206@nsXPTCStubBase@@UAAIXZ
+    ?Stub207@nsXPTCStubBase@@UAAIXZ
+    ?Stub208@nsXPTCStubBase@@UAAIXZ
+    ?Stub209@nsXPTCStubBase@@UAAIXZ
+    ?Stub210@nsXPTCStubBase@@UAAIXZ
+    ?Stub211@nsXPTCStubBase@@UAAIXZ
+    ?Stub212@nsXPTCStubBase@@UAAIXZ
+    ?Stub213@nsXPTCStubBase@@UAAIXZ
+    ?Stub214@nsXPTCStubBase@@UAAIXZ
+    ?Stub215@nsXPTCStubBase@@UAAIXZ
+    ?Stub216@nsXPTCStubBase@@UAAIXZ
+    ?Stub217@nsXPTCStubBase@@UAAIXZ
+    ?Stub218@nsXPTCStubBase@@UAAIXZ
+    ?Stub219@nsXPTCStubBase@@UAAIXZ
+    ?Stub220@nsXPTCStubBase@@UAAIXZ
+    ?Stub221@nsXPTCStubBase@@UAAIXZ
+    ?Stub222@nsXPTCStubBase@@UAAIXZ
+    ?Stub223@nsXPTCStubBase@@UAAIXZ
+    ?Stub224@nsXPTCStubBase@@UAAIXZ
+    ?Stub225@nsXPTCStubBase@@UAAIXZ
+    ?Stub226@nsXPTCStubBase@@UAAIXZ
+    ?Stub227@nsXPTCStubBase@@UAAIXZ
+    ?Stub228@nsXPTCStubBase@@UAAIXZ
+    ?Stub229@nsXPTCStubBase@@UAAIXZ
+    ?Stub230@nsXPTCStubBase@@UAAIXZ
+    ?Stub231@nsXPTCStubBase@@UAAIXZ
+    ?Stub232@nsXPTCStubBase@@UAAIXZ
+    ?Stub233@nsXPTCStubBase@@UAAIXZ
+    ?Stub234@nsXPTCStubBase@@UAAIXZ
+    ?Stub235@nsXPTCStubBase@@UAAIXZ
+    ?Stub236@nsXPTCStubBase@@UAAIXZ
+    ?Stub237@nsXPTCStubBase@@UAAIXZ
+    ?Stub238@nsXPTCStubBase@@UAAIXZ
+    ?Stub239@nsXPTCStubBase@@UAAIXZ
+    ?Stub240@nsXPTCStubBase@@UAAIXZ
+    ?Stub241@nsXPTCStubBase@@UAAIXZ
+    ?Stub242@nsXPTCStubBase@@UAAIXZ
+    ?Stub243@nsXPTCStubBase@@UAAIXZ
+    ?Stub244@nsXPTCStubBase@@UAAIXZ
+    ?Stub245@nsXPTCStubBase@@UAAIXZ
+    ?Stub246@nsXPTCStubBase@@UAAIXZ
+    ?Stub247@nsXPTCStubBase@@UAAIXZ
+    ?Stub248@nsXPTCStubBase@@UAAIXZ
+    ?Stub249@nsXPTCStubBase@@UAAIXZ
+
diff --git a/xpcom/build/xrecore.h b/xpcom/build/xrecore.h
new file mode 100644
index 0000000000..9749a8e906
--- /dev/null
+++ b/xpcom/build/xrecore.h
@@ -0,0 +1,25 @@
+/* -*- 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/. */
+
+#ifndef xrecore_h__
+#define xrecore_h__
+
+#include "nscore.h"
+
+/**
+ * Import/export macros for libXUL APIs.
+ */
+#ifdef XPCOM_GLUE
+#define XRE_API(type, name, params) \
+  typedef type (NS_FROZENCALL * name##Type) params; \
+  extern name##Type name NS_HIDDEN;
+#elif defined(IMPL_LIBXUL)
+#define XRE_API(type, name, params) EXPORT_XPCOM_API(type) name params;
+#else
+#define XRE_API(type, name, params) IMPORT_XPCOM_API(type) name params;
+#endif
+
+#endif // xrecore_h__