Add m-esr52 at 52.6.0

20 files changed, 5490 insertions, 0 deletions

diff --git a/xpcom/components/ManifestParser.cpp b/xpcom/components/ManifestParser.cpp
new file mode 100644
index 000000000..4dcfc8402
--- /dev/null
+++ b/xpcom/components/ManifestParser.cpp
@@ -0,0 +1,792 @@
+/* -*- 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/ArrayUtils.h"
+
+#include "ManifestParser.h"
+
+#include <string.h>
+
+#include "prio.h"
+#include "prprf.h"
+#if defined(XP_WIN)
+#include <windows.h>
+#elif defined(MOZ_WIDGET_COCOA)
+#include <CoreServices/CoreServices.h>
+#include "nsCocoaFeatures.h"
+#elif defined(MOZ_WIDGET_GTK)
+#include <gtk/gtk.h>
+#endif
+
+#ifdef MOZ_WIDGET_ANDROID
+#include "AndroidBridge.h"
+#endif
+
+#include "mozilla/Services.h"
+
+#include "nsCRT.h"
+#include "nsConsoleMessage.h"
+#include "nsTextFormatter.h"
+#include "nsVersionComparator.h"
+#include "nsXPCOMCIDInternal.h"
+
+#include "nsIConsoleService.h"
+#include "nsIScriptError.h"
+#include "nsIXULAppInfo.h"
+#include "nsIXULRuntime.h"
+
+using namespace mozilla;
+
+struct ManifestDirective
+{
+  const char* directive;
+  int argc;
+
+  // Binary components are only allowed for APP locations.
+  bool apponly;
+
+  // Some directives should only be delivered for APP or EXTENSION locations.
+  bool componentonly;
+
+  bool ischrome;
+
+  bool allowbootstrap;
+
+  // The platform/contentaccessible flags only apply to content directives.
+  bool contentflags;
+
+  // Function to handle this directive. This isn't a union because C++ still
+  // hasn't learned how to initialize unions in a sane way.
+  void (nsComponentManagerImpl::*mgrfunc)(
+    nsComponentManagerImpl::ManifestProcessingContext& aCx,
+    int aLineNo, char* const* aArgv);
+  void (nsChromeRegistry::*regfunc)(
+    nsChromeRegistry::ManifestProcessingContext& aCx,
+    int aLineNo, char* const* aArgv, int aFlags);
+  void* xptonlyfunc;
+
+  bool isContract;
+};
+static const ManifestDirective kParsingTable[] = {
+  {
+    "manifest",         1, false, false, true, true, false,
+    &nsComponentManagerImpl::ManifestManifest, nullptr, nullptr
+  },
+  {
+    "binary-component", 1, true, true, false, false, false,
+    &nsComponentManagerImpl::ManifestBinaryComponent, nullptr, nullptr
+  },
+  {
+    "interfaces",       1, false, true, false, false, false,
+    &nsComponentManagerImpl::ManifestXPT, nullptr, nullptr
+  },
+  {
+    "component",        2, false, true, false, false, false,
+    &nsComponentManagerImpl::ManifestComponent, nullptr, nullptr
+  },
+  {
+    "contract",         2, false, true, false, false, false,
+    &nsComponentManagerImpl::ManifestContract, nullptr, nullptr, true
+  },
+  {
+    "category",         3, false, true, false, false, false,
+    &nsComponentManagerImpl::ManifestCategory, nullptr, nullptr
+  },
+  {
+    "content",          2, false, true, true, true,  true,
+    nullptr, &nsChromeRegistry::ManifestContent, nullptr
+  },
+  {
+    "locale",           3, false, true, true, true, false,
+    nullptr, &nsChromeRegistry::ManifestLocale, nullptr
+  },
+  {
+    "skin",             3, false, false, true, true, false,
+    nullptr, &nsChromeRegistry::ManifestSkin, nullptr
+  },
+  {
+    "overlay",          2, false, true, true, false, false,
+    nullptr, &nsChromeRegistry::ManifestOverlay, nullptr
+  },
+  {
+    "style",            2, false, false, true, false, false,
+    nullptr, &nsChromeRegistry::ManifestStyle, nullptr
+  },
+  {
+    // NB: note that while skin manifests can use this, they are only allowed
+    // to use it for chrome://../skin/ URLs
+    "override",         2, false, false, true, true, false,
+    nullptr, &nsChromeRegistry::ManifestOverride, nullptr
+  },
+  {
+    "resource",         2, false, true, true, true, false,
+    nullptr, &nsChromeRegistry::ManifestResource, nullptr
+  }
+};
+
+static const char kWhitespace[] = "\t ";
+
+static bool
+IsNewline(char aChar)
+{
+  return aChar == '\n' || aChar == '\r';
+}
+
+namespace {
+struct AutoPR_smprintf_free
+{
+  explicit AutoPR_smprintf_free(char* aBuf) : mBuf(aBuf) {}
+
+  ~AutoPR_smprintf_free()
+  {
+    if (mBuf) {
+      PR_smprintf_free(mBuf);
+    }
+  }
+
+  operator char*() const { return mBuf; }
+
+  char* mBuf;
+};
+
+} // namespace
+
+/**
+ * If we are pre-loading XPTs, this method may do nothing because the
+ * console service is not initialized.
+ */
+void
+LogMessage(const char* aMsg, ...)
+{
+  if (!nsComponentManagerImpl::gComponentManager) {
+    return;
+  }
+
+  nsCOMPtr<nsIConsoleService> console =
+    do_GetService(NS_CONSOLESERVICE_CONTRACTID);
+  if (!console) {
+    return;
+  }
+
+  va_list args;
+  va_start(args, aMsg);
+  AutoPR_smprintf_free formatted(PR_vsmprintf(aMsg, args));
+  va_end(args);
+
+  nsCOMPtr<nsIConsoleMessage> error =
+    new nsConsoleMessage(NS_ConvertUTF8toUTF16(formatted).get());
+  console->LogMessage(error);
+}
+
+/**
+ * If we are pre-loading XPTs, this method may do nothing because the
+ * console service is not initialized.
+ */
+void
+LogMessageWithContext(FileLocation& aFile,
+                      uint32_t aLineNumber, const char* aMsg, ...)
+{
+  va_list args;
+  va_start(args, aMsg);
+  AutoPR_smprintf_free formatted(PR_vsmprintf(aMsg, args));
+  va_end(args);
+  if (!formatted) {
+    return;
+  }
+
+  if (!nsComponentManagerImpl::gComponentManager) {
+    return;
+  }
+
+  nsCString file;
+  aFile.GetURIString(file);
+
+  nsCOMPtr<nsIScriptError> error =
+    do_CreateInstance(NS_SCRIPTERROR_CONTRACTID);
+  if (!error) {
+    // This can happen early in component registration. Fall back to a
+    // generic console message.
+    LogMessage("Warning: in '%s', line %i: %s", file.get(),
+               aLineNumber, (char*)formatted);
+    return;
+  }
+
+  nsCOMPtr<nsIConsoleService> console =
+    do_GetService(NS_CONSOLESERVICE_CONTRACTID);
+  if (!console) {
+    return;
+  }
+
+  nsresult rv = error->Init(NS_ConvertUTF8toUTF16(formatted),
+                            NS_ConvertUTF8toUTF16(file), EmptyString(),
+                            aLineNumber, 0, nsIScriptError::warningFlag,
+                            "chrome registration");
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  console->LogMessage(error);
+}
+
+/**
+ * Check for a modifier flag of the following forms:
+ *   "flag"   (same as "true")
+ *   "flag=yes|true|1"
+ *   "flag="no|false|0"
+ * @param aFlag The flag to compare.
+ * @param aData The tokenized data to check; this is lowercased
+ *              before being passed in.
+ * @param aResult If the flag is found, the value is assigned here.
+ * @return Whether the flag was handled.
+ */
+static bool
+CheckFlag(const nsSubstring& aFlag, const nsSubstring& aData, bool& aResult)
+{
+  if (!StringBeginsWith(aData, aFlag)) {
+    return false;
+  }
+
+  if (aFlag.Length() == aData.Length()) {
+    // the data is simply "flag", which is the same as "flag=yes"
+    aResult = true;
+    return true;
+  }
+
+  if (aData.CharAt(aFlag.Length()) != '=') {
+    // the data is "flag2=", which is not anything we care about
+    return false;
+  }
+
+  if (aData.Length() == aFlag.Length() + 1) {
+    aResult = false;
+    return true;
+  }
+
+  switch (aData.CharAt(aFlag.Length() + 1)) {
+    case '1':
+    case 't': //true
+    case 'y': //yes
+      aResult = true;
+      return true;
+
+    case '0':
+    case 'f': //false
+    case 'n': //no
+      aResult = false;
+      return true;
+  }
+
+  return false;
+}
+
+enum TriState
+{
+  eUnspecified,
+  eBad,
+  eOK
+};
+
+/**
+ * Check for a modifier flag of the following form:
+ *   "flag=string"
+ *   "flag!=string"
+ * @param aFlag The flag to compare.
+ * @param aData The tokenized data to check; this is lowercased
+ *              before being passed in.
+ * @param aValue The value that is expected.
+ * @param aResult If this is "ok" when passed in, this is left alone.
+ *                Otherwise if the flag is found it is set to eBad or eOK.
+ * @return Whether the flag was handled.
+ */
+static bool
+CheckStringFlag(const nsSubstring& aFlag, const nsSubstring& aData,
+                const nsSubstring& aValue, TriState& aResult)
+{
+  if (aData.Length() < aFlag.Length() + 1) {
+    return false;
+  }
+
+  if (!StringBeginsWith(aData, aFlag)) {
+    return false;
+  }
+
+  bool comparison = true;
+  if (aData[aFlag.Length()] != '=') {
+    if (aData[aFlag.Length()] == '!' &&
+        aData.Length() >= aFlag.Length() + 2 &&
+        aData[aFlag.Length() + 1] == '=') {
+      comparison = false;
+    } else {
+      return false;
+    }
+  }
+
+  if (aResult != eOK) {
+    nsDependentSubstring testdata =
+      Substring(aData, aFlag.Length() + (comparison ? 1 : 2));
+    if (testdata.Equals(aValue)) {
+      aResult = comparison ? eOK : eBad;
+    } else {
+      aResult = comparison ? eBad : eOK;
+    }
+  }
+
+  return true;
+}
+
+/**
+ * Check for a modifier flag of the following form:
+ *   "flag=version"
+ *   "flag<=version"
+ *   "flag<version"
+ *   "flag>=version"
+ *   "flag>version"
+ * @param aFlag The flag to compare.
+ * @param aData The tokenized data to check; this is lowercased
+ *              before being passed in.
+ * @param aValue The value that is expected. If this is empty then no
+ *               comparison will match.
+ * @param aResult If this is eOK when passed in, this is left alone.
+ *                Otherwise if the flag is found it is set to eBad or eOK.
+ * @return Whether the flag was handled.
+ */
+
+#define COMPARE_EQ    1 << 0
+#define COMPARE_LT    1 << 1
+#define COMPARE_GT    1 << 2
+
+static bool
+CheckVersionFlag(const nsString& aFlag, const nsString& aData,
+                 const nsString& aValue, TriState& aResult)
+{
+  if (aData.Length() < aFlag.Length() + 2) {
+    return false;
+  }
+
+  if (!StringBeginsWith(aData, aFlag)) {
+    return false;
+  }
+
+  if (aValue.Length() == 0) {
+    if (aResult != eOK) {
+      aResult = eBad;
+    }
+    return true;
+  }
+
+  uint32_t comparison;
+  nsAutoString testdata;
+
+  switch (aData[aFlag.Length()]) {
+    case '=':
+      comparison = COMPARE_EQ;
+      testdata = Substring(aData, aFlag.Length() + 1);
+      break;
+
+    case '<':
+      if (aData[aFlag.Length() + 1] == '=') {
+        comparison = COMPARE_EQ | COMPARE_LT;
+        testdata = Substring(aData, aFlag.Length() + 2);
+      } else {
+        comparison = COMPARE_LT;
+        testdata = Substring(aData, aFlag.Length() + 1);
+      }
+      break;
+
+    case '>':
+      if (aData[aFlag.Length() + 1] == '=') {
+        comparison = COMPARE_EQ | COMPARE_GT;
+        testdata = Substring(aData, aFlag.Length() + 2);
+      } else {
+        comparison = COMPARE_GT;
+        testdata = Substring(aData, aFlag.Length() + 1);
+      }
+      break;
+
+    default:
+      return false;
+  }
+
+  if (testdata.Length() == 0) {
+    return false;
+  }
+
+  if (aResult != eOK) {
+    int32_t c = mozilla::CompareVersions(NS_ConvertUTF16toUTF8(aValue).get(),
+                                         NS_ConvertUTF16toUTF8(testdata).get());
+    if ((c == 0 && comparison & COMPARE_EQ) ||
+        (c < 0 && comparison & COMPARE_LT) ||
+        (c > 0 && comparison & COMPARE_GT)) {
+      aResult = eOK;
+    } else {
+      aResult = eBad;
+    }
+  }
+
+  return true;
+}
+
+// In-place conversion of ascii characters to lower case
+static void
+ToLowerCase(char* aToken)
+{
+  for (; *aToken; ++aToken) {
+    *aToken = NS_ToLower(*aToken);
+  }
+}
+
+namespace {
+
+struct CachedDirective
+{
+  int lineno;
+  char* argv[4];
+};
+
+} // namespace
+
+
+/**
+ * For XPT-Only mode, the parser handles only directives of "manifest"
+ * and "interfaces", and always call the function given by |xptonlyfunc|
+ * variable of struct |ManifestDirective|.
+ *
+ * This function is safe to be called before the component manager is
+ * ready if aXPTOnly is true for it don't invoke any component during
+ * parsing.
+ */
+void
+ParseManifest(NSLocationType aType, FileLocation& aFile, char* aBuf,
+              bool aChromeOnly, bool aXPTOnly)
+{
+  nsComponentManagerImpl::ManifestProcessingContext mgrcx(aType, aFile,
+                                                          aChromeOnly);
+  nsChromeRegistry::ManifestProcessingContext chromecx(aType, aFile);
+  nsresult rv;
+
+  NS_NAMED_LITERAL_STRING(kPlatform, "platform");
+  NS_NAMED_LITERAL_STRING(kContentAccessible, "contentaccessible");
+  NS_NAMED_LITERAL_STRING(kRemoteEnabled, "remoteenabled");
+  NS_NAMED_LITERAL_STRING(kRemoteRequired, "remoterequired");
+  NS_NAMED_LITERAL_STRING(kApplication, "application");
+  NS_NAMED_LITERAL_STRING(kAppVersion, "appversion");
+  NS_NAMED_LITERAL_STRING(kGeckoVersion, "platformversion");
+  NS_NAMED_LITERAL_STRING(kOs, "os");
+  NS_NAMED_LITERAL_STRING(kOsVersion, "osversion");
+  NS_NAMED_LITERAL_STRING(kABI, "abi");
+  NS_NAMED_LITERAL_STRING(kProcess, "process");
+#if defined(MOZ_WIDGET_ANDROID)
+  NS_NAMED_LITERAL_STRING(kTablet, "tablet");
+#endif
+
+  NS_NAMED_LITERAL_STRING(kMain, "main");
+  NS_NAMED_LITERAL_STRING(kContent, "content");
+
+  // Obsolete
+  NS_NAMED_LITERAL_STRING(kXPCNativeWrappers, "xpcnativewrappers");
+
+  nsAutoString appID;
+  nsAutoString appVersion;
+  nsAutoString geckoVersion;
+  nsAutoString osTarget;
+  nsAutoString abi;
+  nsAutoString process;
+
+  nsCOMPtr<nsIXULAppInfo> xapp;
+  if (!aXPTOnly) {
+    // Avoid to create any component for XPT only mode.
+    // No xapp means no ID, version, ..., modifiers checking.
+    xapp = do_GetService(XULAPPINFO_SERVICE_CONTRACTID);
+  }
+  if (xapp) {
+    nsAutoCString s;
+    rv = xapp->GetID(s);
+    if (NS_SUCCEEDED(rv)) {
+      CopyUTF8toUTF16(s, appID);
+    }
+
+    rv = xapp->GetVersion(s);
+    if (NS_SUCCEEDED(rv)) {
+      CopyUTF8toUTF16(s, appVersion);
+    }
+
+    rv = xapp->GetPlatformVersion(s);
+    if (NS_SUCCEEDED(rv)) {
+      CopyUTF8toUTF16(s, geckoVersion);
+    }
+
+    nsCOMPtr<nsIXULRuntime> xruntime(do_QueryInterface(xapp));
+    if (xruntime) {
+      rv = xruntime->GetOS(s);
+      if (NS_SUCCEEDED(rv)) {
+        ToLowerCase(s);
+        CopyUTF8toUTF16(s, osTarget);
+      }
+
+      rv = xruntime->GetXPCOMABI(s);
+      if (NS_SUCCEEDED(rv) && osTarget.Length()) {
+        ToLowerCase(s);
+        CopyUTF8toUTF16(s, abi);
+        abi.Insert(char16_t('_'), 0);
+        abi.Insert(osTarget, 0);
+      }
+    }
+  }
+
+  nsAutoString osVersion;
+#if defined(XP_WIN)
+#pragma warning(push)
+#pragma warning(disable:4996) // VC12+ deprecates GetVersionEx
+  OSVERSIONINFO info = { sizeof(OSVERSIONINFO) };
+  if (GetVersionEx(&info)) {
+    nsTextFormatter::ssprintf(osVersion, u"%ld.%ld",
+                              info.dwMajorVersion,
+                              info.dwMinorVersion);
+  }
+#pragma warning(pop)
+#elif defined(MOZ_WIDGET_COCOA)
+  SInt32 majorVersion = nsCocoaFeatures::OSXVersionMajor();
+  SInt32 minorVersion = nsCocoaFeatures::OSXVersionMinor();
+  nsTextFormatter::ssprintf(osVersion, u"%ld.%ld",
+                            majorVersion,
+                            minorVersion);
+#elif defined(MOZ_WIDGET_GTK)
+  nsTextFormatter::ssprintf(osVersion, u"%ld.%ld",
+                            gtk_major_version,
+                            gtk_minor_version);
+#elif defined(MOZ_WIDGET_ANDROID)
+  bool isTablet = false;
+  if (mozilla::AndroidBridge::Bridge()) {
+    mozilla::AndroidBridge::Bridge()->GetStaticStringField("android/os/Build$VERSION",
+                                                           "RELEASE",
+                                                           osVersion);
+    isTablet = java::GeckoAppShell::IsTablet();
+  }
+#endif
+
+  if (XRE_IsContentProcess()) {
+    process = kContent;
+  } else {
+    process = kMain;
+  }
+
+  // Because contracts must be registered after CIDs, we save and process them
+  // at the end.
+  nsTArray<CachedDirective> contracts;
+
+  char* token;
+  char* newline = aBuf;
+  uint32_t line = 0;
+
+  // outer loop tokenizes by newline
+  while (*newline) {
+    while (*newline && IsNewline(*newline)) {
+      ++newline;
+      ++line;
+    }
+    if (!*newline) {
+      break;
+    }
+
+    token = newline;
+    while (*newline && !IsNewline(*newline)) {
+      ++newline;
+    }
+
+    if (*newline) {
+      *newline = '\0';
+      ++newline;
+    }
+    ++line;
+
+    if (*token == '#') { // ignore lines that begin with # as comments
+      continue;
+    }
+
+    char* whitespace = token;
+    token = nsCRT::strtok(whitespace, kWhitespace, &whitespace);
+    if (!token) {
+      continue;
+    }
+
+    const ManifestDirective* directive = nullptr;
+    for (const ManifestDirective* d = kParsingTable;
+         d < ArrayEnd(kParsingTable);
+         ++d) {
+      if (!strcmp(d->directive, token) &&
+          (!aXPTOnly || d->xptonlyfunc)) {
+        directive = d;
+        break;
+      }
+    }
+
+    if (!directive) {
+      LogMessageWithContext(aFile, line,
+                            "Ignoring unrecognized chrome manifest directive '%s'.",
+                            token);
+      continue;
+    }
+
+    if (!directive->allowbootstrap && NS_BOOTSTRAPPED_LOCATION == aType) {
+      LogMessageWithContext(aFile, line,
+                            "Bootstrapped manifest not allowed to use '%s' directive.",
+                            token);
+      continue;
+    }
+
+#ifndef MOZ_BINARY_EXTENSIONS
+    if (directive->apponly && NS_APP_LOCATION != aType) {
+      LogMessageWithContext(aFile, line,
+                            "Only application manifests may use the '%s' directive.", token);
+      continue;
+    }
+#endif
+
+    if (directive->componentonly && NS_SKIN_LOCATION == aType) {
+      LogMessageWithContext(aFile, line,
+                            "Skin manifest not allowed to use '%s' directive.",
+                            token);
+      continue;
+    }
+
+    NS_ASSERTION(directive->argc < 4, "Need to reset argv array length");
+    char* argv[4];
+    for (int i = 0; i < directive->argc; ++i) {
+      argv[i] = nsCRT::strtok(whitespace, kWhitespace, &whitespace);
+    }
+
+    if (!argv[directive->argc - 1]) {
+      LogMessageWithContext(aFile, line,
+                            "Not enough arguments for chrome manifest directive '%s', expected %i.",
+                            token, directive->argc);
+      continue;
+    }
+
+    bool ok = true;
+    TriState stAppVersion = eUnspecified;
+    TriState stGeckoVersion = eUnspecified;
+    TriState stApp = eUnspecified;
+    TriState stOsVersion = eUnspecified;
+    TriState stOs = eUnspecified;
+    TriState stABI = eUnspecified;
+    TriState stProcess = eUnspecified;
+#if defined(MOZ_WIDGET_ANDROID)
+    TriState stTablet = eUnspecified;
+#endif
+    int flags = 0;
+
+    while ((token = nsCRT::strtok(whitespace, kWhitespace, &whitespace)) &&
+           ok) {
+      ToLowerCase(token);
+      NS_ConvertASCIItoUTF16 wtoken(token);
+
+      if (CheckStringFlag(kApplication, wtoken, appID, stApp) ||
+          CheckStringFlag(kOs, wtoken, osTarget, stOs) ||
+          CheckStringFlag(kABI, wtoken, abi, stABI) ||
+          CheckStringFlag(kProcess, wtoken, process, stProcess) ||
+          CheckVersionFlag(kOsVersion, wtoken, osVersion, stOsVersion) ||
+          CheckVersionFlag(kAppVersion, wtoken, appVersion, stAppVersion) ||
+          CheckVersionFlag(kGeckoVersion, wtoken, geckoVersion, stGeckoVersion)) {
+        continue;
+      }
+
+#if defined(MOZ_WIDGET_ANDROID)
+      bool tablet = false;
+      if (CheckFlag(kTablet, wtoken, tablet)) {
+        stTablet = (tablet == isTablet) ? eOK : eBad;
+        continue;
+      }
+#endif
+
+      if (directive->contentflags) {
+        bool flag;
+        if (CheckFlag(kPlatform, wtoken, flag)) {
+          if (flag)
+            flags |= nsChromeRegistry::PLATFORM_PACKAGE;
+          continue;
+        }
+        if (CheckFlag(kContentAccessible, wtoken, flag)) {
+          if (flag)
+            flags |= nsChromeRegistry::CONTENT_ACCESSIBLE;
+          continue;
+        }
+        if (CheckFlag(kRemoteEnabled, wtoken, flag)) {
+          if (flag)
+            flags |= nsChromeRegistry::REMOTE_ALLOWED;
+          continue;
+        }
+        if (CheckFlag(kRemoteRequired, wtoken, flag)) {
+          if (flag)
+            flags |= nsChromeRegistry::REMOTE_REQUIRED;
+          continue;
+        }
+      }
+
+      bool xpcNativeWrappers = true; // Dummy for CheckFlag.
+      if (CheckFlag(kXPCNativeWrappers, wtoken, xpcNativeWrappers)) {
+        LogMessageWithContext(aFile, line,
+                              "Ignoring obsolete chrome registration modifier '%s'.",
+                              token);
+        continue;
+      }
+
+      LogMessageWithContext(aFile, line,
+                            "Unrecognized chrome manifest modifier '%s'.",
+                            token);
+      ok = false;
+    }
+
+    if (!ok ||
+        stApp == eBad ||
+        stAppVersion == eBad ||
+        stGeckoVersion == eBad ||
+        stOs == eBad ||
+        stOsVersion == eBad ||
+#ifdef MOZ_WIDGET_ANDROID
+        stTablet == eBad ||
+#endif
+        stABI == eBad ||
+        stProcess == eBad) {
+      continue;
+    }
+
+    if (directive->regfunc) {
+      if (GeckoProcessType_Default != XRE_GetProcessType()) {
+        continue;
+      }
+
+      if (!nsChromeRegistry::gChromeRegistry) {
+        nsCOMPtr<nsIChromeRegistry> cr =
+          mozilla::services::GetChromeRegistryService();
+        if (!nsChromeRegistry::gChromeRegistry) {
+          LogMessageWithContext(aFile, line,
+                                "Chrome registry isn't available yet.");
+          continue;
+        }
+      }
+
+      (nsChromeRegistry::gChromeRegistry->*(directive->regfunc))(
+        chromecx, line, argv, flags);
+    } else if (directive->ischrome || !aChromeOnly) {
+      if (directive->isContract) {
+        CachedDirective* cd = contracts.AppendElement();
+        cd->lineno = line;
+        cd->argv[0] = argv[0];
+        cd->argv[1] = argv[1];
+      } else {
+        (nsComponentManagerImpl::gComponentManager->*(directive->mgrfunc))(
+          mgrcx, line, argv);
+      }
+    }
+  }
+
+  for (uint32_t i = 0; i < contracts.Length(); ++i) {
+    CachedDirective& d = contracts[i];
+    nsComponentManagerImpl::gComponentManager->ManifestContract(mgrcx,
+                                                                d.lineno,
+                                                                d.argv);
+  }
+}
diff --git a/xpcom/components/ManifestParser.h b/xpcom/components/ManifestParser.h
new file mode 100644
index 000000000..019ec326c
--- /dev/null
+++ b/xpcom/components/ManifestParser.h
@@ -0,0 +1,22 @@
+/* -*- 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 ManifestParser_h
+#define ManifestParser_h
+
+#include "nsComponentManager.h"
+#include "nsChromeRegistry.h"
+#include "mozilla/FileLocation.h"
+
+void ParseManifest(NSLocationType aType, mozilla::FileLocation& aFile,
+                   char* aBuf, bool aChromeOnly, bool aXPTOnly = false);
+
+void LogMessage(const char* aMsg, ...);
+
+void LogMessageWithContext(mozilla::FileLocation& aFile,
+                           uint32_t aLineNumber, const char* aMsg, ...);
+
+#endif // ManifestParser_h
diff --git a/xpcom/components/Module.h b/xpcom/components/Module.h
new file mode 100644
index 000000000..21d07e82e
--- /dev/null
+++ b/xpcom/components/Module.h
@@ -0,0 +1,157 @@
+/* -*- 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_Module_h
+#define mozilla_Module_h
+
+#include "nscore.h"
+#include "nsID.h"
+#include "nsIFactory.h"
+#include "nsCOMPtr.h" // for already_AddRefed
+
+namespace mozilla {
+
+/**
+ * A module implements one or more XPCOM components. This structure is used
+ * for both binary and script modules, but the registration members
+ * (cids/contractids/categoryentries) are unused for modules which are loaded
+ * via a module loader.
+ */
+struct Module
+{
+  static const unsigned int kVersion = 52;
+
+  struct CIDEntry;
+
+  typedef already_AddRefed<nsIFactory> (*GetFactoryProcPtr)(
+    const Module& module, const CIDEntry& entry);
+
+  typedef nsresult (*ConstructorProcPtr)(nsISupports* aOuter,
+                                         const nsIID& aIID,
+                                         void** aResult);
+
+  typedef nsresult (*LoadFuncPtr)();
+  typedef void (*UnloadFuncPtr)();
+
+  /**
+   * This selector allows CIDEntrys to be marked so that they're only loaded
+   * into certain kinds of processes. Selectors can be combined.
+   */
+  enum ProcessSelector
+  {
+    ANY_PROCESS          = 0x0,
+    MAIN_PROCESS_ONLY    = 0x1,
+    CONTENT_PROCESS_ONLY = 0x2,
+
+    /**
+     * By default, modules are not loaded in the GPU process, even if
+     * ANY_PROCESS is specified. This flag enables a module in the
+     * GPU process.
+     */
+    ALLOW_IN_GPU_PROCESS = 0x4
+  };
+
+  /**
+   * The constructor callback is an implementation detail of the default binary
+   * loader and may be null.
+   */
+  struct CIDEntry
+  {
+    const nsCID* cid;
+    bool service;
+    GetFactoryProcPtr getFactoryProc;
+    ConstructorProcPtr constructorProc;
+    ProcessSelector processSelector;
+  };
+
+  struct ContractIDEntry
+  {
+    const char* contractid;
+    nsID const* cid;
+    ProcessSelector processSelector;
+  };
+
+  struct CategoryEntry
+  {
+    const char* category;
+    const char* entry;
+    const char* value;
+  };
+
+  /**
+   * Binary compatibility check, should be kModuleVersion.
+   */
+  unsigned int mVersion;
+
+  /**
+   * An array of CIDs (class IDs) implemented by this module. The final entry
+   * should be { nullptr }.
+   */
+  const CIDEntry* mCIDs;
+
+  /**
+   * An array of mappings from contractid to CID. The final entry should
+   * be { nullptr }.
+   */
+  const ContractIDEntry* mContractIDs;
+
+  /**
+   * An array of category manager entries. The final entry should be
+   * { nullptr }.
+   */
+  const CategoryEntry* mCategoryEntries;
+
+  /**
+   * When the component manager tries to get the factory for a CID, it first
+   * checks for this module-level getfactory callback. If this function is
+   * not implemented, it checks the CIDEntry getfactory callback. If that is
+   * also nullptr, a generic factory is generated using the CIDEntry
+   * constructor callback which must be non-nullptr.
+   */
+  GetFactoryProcPtr getFactoryProc;
+
+  /**
+   * Optional Function which are called when this module is loaded and
+   * at shutdown. These are not C++ constructor/destructors to avoid
+   * calling them too early in startup or too late in shutdown.
+   */
+  LoadFuncPtr loadProc;
+  UnloadFuncPtr unloadProc;
+
+  /**
+   * Optional flags which control whether the module loads on a process-type
+   * basis.
+   */
+  ProcessSelector selector;
+};
+
+} // namespace mozilla
+
+#if defined(MOZILLA_INTERNAL_API)
+#  define NSMODULE_NAME(_name) _name##_NSModule
+#  if defined(_MSC_VER)
+#    pragma section(".kPStaticModules$M", read)
+#    pragma comment(linker, "/merge:.kPStaticModules=.rdata")
+#    define NSMODULE_SECTION __declspec(allocate(".kPStaticModules$M"), dllexport)
+#  elif defined(__GNUC__)
+#    if defined(__ELF__)
+#      define NSMODULE_SECTION __attribute__((section(".kPStaticModules"), visibility("default")))
+#    elif defined(__MACH__)
+#      define NSMODULE_SECTION __attribute__((section("__DATA, .kPStaticModules"), visibility("default")))
+#    elif defined (_WIN32)
+#      define NSMODULE_SECTION __attribute__((section(".kPStaticModules"), dllexport))
+#    endif
+#  endif
+#  if !defined(NSMODULE_SECTION)
+#    error Do not know how to define sections.
+#  endif
+#  define NSMODULE_DEFN(_name) extern NSMODULE_SECTION mozilla::Module const *const NSMODULE_NAME(_name)
+#else
+#  define NSMODULE_NAME(_name) NSModule
+#  define NSMODULE_DEFN(_name) extern "C" NS_EXPORT mozilla::Module const *const NSModule
+#endif
+
+#endif // mozilla_Module_h
diff --git a/xpcom/components/ModuleLoader.h b/xpcom/components/ModuleLoader.h
new file mode 100644
index 000000000..c2c920d4d
--- /dev/null
+++ b/xpcom/components/ModuleLoader.h
@@ -0,0 +1,44 @@
+/* -*- 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_ModuleLoader_h
+#define mozilla_ModuleLoader_h
+
+#include "nsISupports.h"
+#include "mozilla/Module.h"
+#include "mozilla/FileLocation.h"
+
+#define MOZILLA_MODULELOADER_PSEUDO_IID \
+{ 0xD951A8CE, 0x6E9F, 0x464F, \
+  { 0x8A, 0xC8, 0x14, 0x61, 0xC0, 0xD3, 0x63, 0xC8 } }
+
+namespace mozilla {
+
+/**
+ * Module loaders are responsible for loading a component file. The static
+ * component loader is special and does not use this abstract interface.
+ *
+ * @note Implementations of this interface should be threadsafe,
+ *       methods may be called from any thread.
+ */
+class ModuleLoader : public nsISupports
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_MODULELOADER_PSEUDO_IID)
+
+  /**
+   * Return the module for a specified file. The caller should cache
+   * the module: the implementer should not expect for the same file
+   * to be loaded multiple times. The Module object should either be
+   * statically or permanently allocated; it will not be freed.
+   */
+  virtual const Module* LoadModule(mozilla::FileLocation& aFile) = 0;
+};
+NS_DEFINE_STATIC_IID_ACCESSOR(ModuleLoader, MOZILLA_MODULELOADER_PSEUDO_IID)
+
+} // namespace mozilla
+
+#endif // mozilla_ModuleLoader_h
diff --git a/xpcom/components/ModuleUtils.h b/xpcom/components/ModuleUtils.h
new file mode 100644
index 000000000..9c31ed76b
--- /dev/null
+++ b/xpcom/components/ModuleUtils.h
@@ -0,0 +1,98 @@
+/* -*- 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_GenericModule_h
+#define mozilla_GenericModule_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Module.h"
+
+#define NS_GENERIC_FACTORY_CONSTRUCTOR(_InstanceClass)                        \
+static nsresult                                                               \
+_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
+                            void **aResult)                                   \
+{                                                                             \
+  RefPtr<_InstanceClass> inst;                                                \
+                                                                              \
+  *aResult = nullptr;                                                         \
+  if (nullptr != aOuter) {                                                    \
+    return NS_ERROR_NO_AGGREGATION;                                           \
+  }                                                                           \
+                                                                              \
+  inst = new _InstanceClass();                                                \
+  return inst->QueryInterface(aIID, aResult);                                 \
+}
+
+#define NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(_InstanceClass, _InitMethod)      \
+static nsresult                                                               \
+_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
+                            void **aResult)                                   \
+{                                                                             \
+  nsresult rv;                                                                \
+                                                                              \
+  RefPtr<_InstanceClass> inst;                                                \
+                                                                              \
+  *aResult = nullptr;                                                         \
+  if (nullptr != aOuter) {                                                    \
+    return NS_ERROR_NO_AGGREGATION;                                           \
+  }                                                                           \
+                                                                              \
+  inst = new _InstanceClass();                                                \
+  rv = inst->_InitMethod();                                                   \
+  if (NS_SUCCEEDED(rv)) {                                                     \
+    rv = inst->QueryInterface(aIID, aResult);                                 \
+  }                                                                           \
+                                                                              \
+  return rv;                                                                  \
+}
+
+// 'Constructor' that uses an existing getter function that gets a singleton.
+// NOTE: assumes that getter does an AddRef - so additional AddRef is not done.
+#define NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(_InstanceClass, _GetterProc) \
+static nsresult                                                               \
+_InstanceClass##Constructor(nsISupports *aOuter, REFNSIID aIID,               \
+                            void **aResult)                                   \
+{                                                                             \
+  RefPtr<_InstanceClass> inst;                                                \
+                                                                              \
+  *aResult = nullptr;                                                         \
+  if (nullptr != aOuter) {                                                    \
+    return NS_ERROR_NO_AGGREGATION;                                           \
+  }                                                                           \
+                                                                              \
+  inst = already_AddRefed<_InstanceClass>(_GetterProc());                     \
+  if (nullptr == inst) {                                                      \
+    return NS_ERROR_OUT_OF_MEMORY;                                            \
+  }                                                                           \
+  return inst->QueryInterface(aIID, aResult);                                 \
+}
+
+#ifndef MOZILLA_INTERNAL_API
+
+#include "nsIModule.h"
+#include "nsISupportsUtils.h"
+
+namespace mozilla {
+
+class GenericModule final : public nsIModule
+{
+  ~GenericModule() {}
+
+public:
+  explicit GenericModule(const mozilla::Module* aData) : mData(aData) {}
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIMODULE
+
+private:
+  const mozilla::Module* mData;
+};
+
+} // namespace mozilla
+
+#endif
+
+#endif // mozilla_GenericModule_h
diff --git a/xpcom/components/moz.build b/xpcom/components/moz.build
new file mode 100644
index 000000000..73a85cb3b
--- /dev/null
+++ b/xpcom/components/moz.build
@@ -0,0 +1,55 @@
+# -*- 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/.
+
+XPIDL_SOURCES += [
+    'nsICategoryManager.idl',
+    'nsIClassInfo.idl',
+    'nsIComponentManager.idl',
+    'nsIComponentRegistrar.idl',
+    'nsIFactory.idl',
+    'nsIModule.idl',
+    'nsIServiceManager.idl',
+]
+
+XPIDL_MODULE = 'xpcom_components'
+
+EXPORTS += [
+    'nsCategoryManagerUtils.h',
+]
+
+EXPORTS.mozilla += [
+    'Module.h',
+    'ModuleLoader.h',
+    'ModuleUtils.h',
+]
+
+# nsCategoryManager.cpp and nsComponentManager.cpp cannot be built in
+# unified mode because they use thea PL_ARENA_CONST_ALIGN_MASK macro
+# with plarena.h.
+SOURCES += [
+    'nsCategoryManager.cpp',
+    'nsComponentManager.cpp',
+]
+
+UNIFIED_SOURCES += [
+    'ManifestParser.cpp',
+    'nsNativeModuleLoader.cpp',
+]
+
+FINAL_LIBRARY = 'xul'
+
+LOCAL_INCLUDES += [
+    '!..',
+    '../base',
+    '../build',
+    '../ds',
+    '../reflect/xptinfo',
+    '/chrome',
+    '/modules/libjar',
+]
+
+if 'gtk' in CONFIG['MOZ_WIDGET_TOOLKIT']:
+    CXXFLAGS += CONFIG['TK_CFLAGS']
diff --git a/xpcom/components/nsCategoryManager.cpp b/xpcom/components/nsCategoryManager.cpp
new file mode 100644
index 000000000..527c78719
--- /dev/null
+++ b/xpcom/components/nsCategoryManager.cpp
@@ -0,0 +1,832 @@
+/* -*- 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/. */
+
+#define PL_ARENA_CONST_ALIGN_MASK 7
+
+#include "nsICategoryManager.h"
+#include "nsCategoryManager.h"
+
+#include "plarena.h"
+#include "prio.h"
+#include "prprf.h"
+#include "prlock.h"
+#include "nsCOMPtr.h"
+#include "nsTHashtable.h"
+#include "nsClassHashtable.h"
+#include "nsIFactory.h"
+#include "nsIStringEnumerator.h"
+#include "nsSupportsPrimitives.h"
+#include "nsComponentManagerUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsReadableUtils.h"
+#include "nsCRT.h"
+#include "nsQuickSort.h"
+#include "nsEnumeratorUtils.h"
+#include "nsThreadUtils.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Services.h"
+
+#include "ManifestParser.h"
+#include "nsISimpleEnumerator.h"
+
+using namespace mozilla;
+class nsIComponentLoaderManager;
+
+/*
+  CategoryDatabase
+  contains 0 or more 1-1 mappings of string to Category
+  each Category contains 0 or more 1-1 mappings of string keys to string values
+
+  In other words, the CategoryDatabase is a tree, whose root is a hashtable.
+  Internal nodes (or Categories) are hashtables. Leaf nodes are strings.
+
+  The leaf strings are allocated in an arena, because we assume they're not
+  going to change much ;)
+*/
+
+#define NS_CATEGORYMANAGER_ARENA_SIZE (1024 * 8)
+
+// pulled in from nsComponentManager.cpp
+char* ArenaStrdup(const char* aStr, PLArenaPool* aArena);
+
+//
+// BaseStringEnumerator is subclassed by EntryEnumerator and
+// CategoryEnumerator
+//
+class BaseStringEnumerator
+  : public nsISimpleEnumerator
+  , private nsIUTF8StringEnumerator
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISIMPLEENUMERATOR
+  NS_DECL_NSIUTF8STRINGENUMERATOR
+
+protected:
+  // Callback function for NS_QuickSort to sort mArray
+  static int SortCallback(const void*, const void*, void*);
+
+  BaseStringEnumerator()
+    : mArray(nullptr)
+    , mCount(0)
+    , mSimpleCurItem(0)
+    , mStringCurItem(0)
+  {
+  }
+
+  // A virtual destructor is needed here because subclasses of
+  // BaseStringEnumerator do not implement their own Release() method.
+
+  virtual ~BaseStringEnumerator()
+  {
+    delete [] mArray;
+  }
+
+  void Sort();
+
+  const char** mArray;
+  uint32_t mCount;
+  uint32_t mSimpleCurItem;
+  uint32_t mStringCurItem;
+};
+
+NS_IMPL_ISUPPORTS(BaseStringEnumerator, nsISimpleEnumerator,
+                  nsIUTF8StringEnumerator)
+
+NS_IMETHODIMP
+BaseStringEnumerator::HasMoreElements(bool* aResult)
+{
+  *aResult = (mSimpleCurItem < mCount);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+BaseStringEnumerator::GetNext(nsISupports** aResult)
+{
+  if (mSimpleCurItem >= mCount) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsSupportsDependentCString* str =
+    new nsSupportsDependentCString(mArray[mSimpleCurItem++]);
+  if (!str) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  *aResult = str;
+  NS_ADDREF(*aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+BaseStringEnumerator::HasMore(bool* aResult)
+{
+  *aResult = (mStringCurItem < mCount);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+BaseStringEnumerator::GetNext(nsACString& aResult)
+{
+  if (mStringCurItem >= mCount) {
+    return NS_ERROR_FAILURE;
+  }
+
+  aResult = nsDependentCString(mArray[mStringCurItem++]);
+  return NS_OK;
+}
+
+int
+BaseStringEnumerator::SortCallback(const void* aE1, const void* aE2,
+                                   void* /*unused*/)
+{
+  char const* const* s1 = reinterpret_cast<char const* const*>(aE1);
+  char const* const* s2 = reinterpret_cast<char const* const*>(aE2);
+
+  return strcmp(*s1, *s2);
+}
+
+void
+BaseStringEnumerator::Sort()
+{
+  NS_QuickSort(mArray, mCount, sizeof(mArray[0]), SortCallback, nullptr);
+}
+
+//
+// EntryEnumerator is the wrapper that allows nsICategoryManager::EnumerateCategory
+//
+class EntryEnumerator
+  : public BaseStringEnumerator
+{
+public:
+  static EntryEnumerator* Create(nsTHashtable<CategoryLeaf>& aTable);
+};
+
+
+EntryEnumerator*
+EntryEnumerator::Create(nsTHashtable<CategoryLeaf>& aTable)
+{
+  EntryEnumerator* enumObj = new EntryEnumerator();
+  if (!enumObj) {
+    return nullptr;
+  }
+
+  enumObj->mArray = new char const* [aTable.Count()];
+  if (!enumObj->mArray) {
+    delete enumObj;
+    return nullptr;
+  }
+
+  for (auto iter = aTable.Iter(); !iter.Done(); iter.Next()) {
+    CategoryLeaf* leaf = iter.Get();
+    if (leaf->value) {
+      enumObj->mArray[enumObj->mCount++] = leaf->GetKey();
+    }
+  }
+
+  enumObj->Sort();
+
+  return enumObj;
+}
+
+
+//
+// CategoryNode implementations
+//
+
+CategoryNode*
+CategoryNode::Create(PLArenaPool* aArena)
+{
+  return new (aArena) CategoryNode();
+}
+
+CategoryNode::~CategoryNode()
+{
+}
+
+void*
+CategoryNode::operator new(size_t aSize, PLArenaPool* aArena)
+{
+  void* p;
+  PL_ARENA_ALLOCATE(p, aArena, aSize);
+  return p;
+}
+
+nsresult
+CategoryNode::GetLeaf(const char* aEntryName,
+                      char** aResult)
+{
+  MutexAutoLock lock(mLock);
+  nsresult rv = NS_ERROR_NOT_AVAILABLE;
+  CategoryLeaf* ent = mTable.GetEntry(aEntryName);
+
+  if (ent && ent->value) {
+    *aResult = NS_strdup(ent->value);
+    if (*aResult) {
+      rv = NS_OK;
+    }
+  }
+
+  return rv;
+}
+
+nsresult
+CategoryNode::AddLeaf(const char* aEntryName,
+                      const char* aValue,
+                      bool aReplace,
+                      char** aResult,
+                      PLArenaPool* aArena)
+{
+  if (aResult) {
+    *aResult = nullptr;
+  }
+
+  MutexAutoLock lock(mLock);
+  CategoryLeaf* leaf = mTable.GetEntry(aEntryName);
+
+  if (!leaf) {
+    const char* arenaEntryName = ArenaStrdup(aEntryName, aArena);
+    if (!arenaEntryName) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    leaf = mTable.PutEntry(arenaEntryName);
+    if (!leaf) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  if (leaf->value && !aReplace) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  const char* arenaValue = ArenaStrdup(aValue, aArena);
+  if (!arenaValue) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  if (aResult && leaf->value) {
+    *aResult = ToNewCString(nsDependentCString(leaf->value));
+    if (!*aResult) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  leaf->value = arenaValue;
+  return NS_OK;
+}
+
+void
+CategoryNode::DeleteLeaf(const char* aEntryName)
+{
+  // we don't throw any errors, because it normally doesn't matter
+  // and it makes JS a lot cleaner
+  MutexAutoLock lock(mLock);
+
+  // we can just remove the entire hash entry without introspection
+  mTable.RemoveEntry(aEntryName);
+}
+
+nsresult
+CategoryNode::Enumerate(nsISimpleEnumerator** aResult)
+{
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  MutexAutoLock lock(mLock);
+  EntryEnumerator* enumObj = EntryEnumerator::Create(mTable);
+
+  if (!enumObj) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  *aResult = enumObj;
+  NS_ADDREF(*aResult);
+  return NS_OK;
+}
+
+size_t
+CategoryNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf)
+{
+  // We don't measure the strings pointed to by the entries because the
+  // pointers are non-owning.
+  return mTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
+}
+
+//
+// CategoryEnumerator class
+//
+
+class CategoryEnumerator
+  : public BaseStringEnumerator
+{
+public:
+  static CategoryEnumerator* Create(nsClassHashtable<nsDepCharHashKey,
+                                                     CategoryNode>& aTable);
+};
+
+CategoryEnumerator*
+CategoryEnumerator::Create(nsClassHashtable<nsDepCharHashKey, CategoryNode>&
+                           aTable)
+{
+  CategoryEnumerator* enumObj = new CategoryEnumerator();
+  if (!enumObj) {
+    return nullptr;
+  }
+
+  enumObj->mArray = new const char* [aTable.Count()];
+  if (!enumObj->mArray) {
+    delete enumObj;
+    return nullptr;
+  }
+
+  for (auto iter = aTable.Iter(); !iter.Done(); iter.Next()) {
+    // if a category has no entries, we pretend it doesn't exist
+    CategoryNode* aNode = iter.UserData();
+    if (aNode->Count()) {
+      const char* str = iter.Key();
+      enumObj->mArray[enumObj->mCount++] = str;
+    }
+  }
+
+  return enumObj;
+}
+
+
+//
+// nsCategoryManager implementations
+//
+
+NS_IMPL_QUERY_INTERFACE(nsCategoryManager, nsICategoryManager, nsIMemoryReporter)
+
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsCategoryManager::AddRef()
+{
+  return 2;
+}
+
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsCategoryManager::Release()
+{
+  return 1;
+}
+
+nsCategoryManager* nsCategoryManager::gCategoryManager;
+
+/* static */ nsCategoryManager*
+nsCategoryManager::GetSingleton()
+{
+  if (!gCategoryManager) {
+    gCategoryManager = new nsCategoryManager();
+  }
+  return gCategoryManager;
+}
+
+/* static */ void
+nsCategoryManager::Destroy()
+{
+  // The nsMemoryReporterManager gets destroyed before the nsCategoryManager,
+  // so we don't need to unregister the nsCategoryManager as a memory reporter.
+  // In debug builds we assert that unregistering fails, as a way (imperfect
+  // but better than nothing) of testing the "destroyed before" part.
+  MOZ_ASSERT(NS_FAILED(UnregisterWeakMemoryReporter(gCategoryManager)));
+
+  delete gCategoryManager;
+  gCategoryManager = nullptr;
+}
+
+nsresult
+nsCategoryManager::Create(nsISupports* aOuter, REFNSIID aIID, void** aResult)
+{
+  if (aOuter) {
+    return NS_ERROR_NO_AGGREGATION;
+  }
+
+  return GetSingleton()->QueryInterface(aIID, aResult);
+}
+
+nsCategoryManager::nsCategoryManager()
+  : mLock("nsCategoryManager")
+  , mSuppressNotifications(false)
+{
+  PL_INIT_ARENA_POOL(&mArena, "CategoryManagerArena",
+                     NS_CATEGORYMANAGER_ARENA_SIZE);
+}
+
+void
+nsCategoryManager::InitMemoryReporter()
+{
+  RegisterWeakMemoryReporter(this);
+}
+
+nsCategoryManager::~nsCategoryManager()
+{
+  // the hashtable contains entries that must be deleted before the arena is
+  // destroyed, or else you will have PRLocks undestroyed and other Really
+  // Bad Stuff (TM)
+  mTable.Clear();
+
+  PL_FinishArenaPool(&mArena);
+}
+
+inline CategoryNode*
+nsCategoryManager::get_category(const char* aName)
+{
+  CategoryNode* node;
+  if (!mTable.Get(aName, &node)) {
+    return nullptr;
+  }
+  return node;
+}
+
+MOZ_DEFINE_MALLOC_SIZE_OF(CategoryManagerMallocSizeOf)
+
+NS_IMETHODIMP
+nsCategoryManager::CollectReports(nsIHandleReportCallback* aHandleReport,
+                                  nsISupports* aData, bool aAnonymize)
+{
+  MOZ_COLLECT_REPORT(
+    "explicit/xpcom/category-manager", KIND_HEAP, UNITS_BYTES,
+    SizeOfIncludingThis(CategoryManagerMallocSizeOf),
+    "Memory used for the XPCOM category manager.");
+
+  return NS_OK;
+}
+
+size_t
+nsCategoryManager::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
+{
+  size_t n = aMallocSizeOf(this);
+
+  n += PL_SizeOfArenaPoolExcludingPool(&mArena, aMallocSizeOf);
+
+  n += mTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (auto iter = mTable.ConstIter(); !iter.Done(); iter.Next()) {
+    // We don't measure the key string because it's a non-owning pointer.
+    n += iter.Data()->SizeOfExcludingThis(aMallocSizeOf);
+  }
+
+  return n;
+}
+
+namespace {
+
+class CategoryNotificationRunnable : public Runnable
+{
+public:
+  CategoryNotificationRunnable(nsISupports* aSubject,
+                               const char* aTopic,
+                               const char* aData)
+    : mSubject(aSubject)
+    , mTopic(aTopic)
+    , mData(aData)
+  {
+  }
+
+  NS_DECL_NSIRUNNABLE
+
+private:
+  nsCOMPtr<nsISupports> mSubject;
+  const char* mTopic;
+  NS_ConvertUTF8toUTF16 mData;
+};
+
+NS_IMETHODIMP
+CategoryNotificationRunnable::Run()
+{
+  nsCOMPtr<nsIObserverService> observerService =
+    mozilla::services::GetObserverService();
+  if (observerService) {
+    observerService->NotifyObservers(mSubject, mTopic, mData.get());
+  }
+
+  return NS_OK;
+}
+
+} // namespace
+
+
+void
+nsCategoryManager::NotifyObservers(const char* aTopic,
+                                   const char* aCategoryName,
+                                   const char* aEntryName)
+{
+  if (mSuppressNotifications) {
+    return;
+  }
+
+  RefPtr<CategoryNotificationRunnable> r;
+
+  if (aEntryName) {
+    nsCOMPtr<nsISupportsCString> entry =
+      do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID);
+    if (!entry) {
+      return;
+    }
+
+    nsresult rv = entry->SetData(nsDependentCString(aEntryName));
+    if (NS_FAILED(rv)) {
+      return;
+    }
+
+    r = new CategoryNotificationRunnable(entry, aTopic, aCategoryName);
+  } else {
+    r = new CategoryNotificationRunnable(NS_ISUPPORTS_CAST(nsICategoryManager*,
+                                                           this),
+                                         aTopic, aCategoryName);
+  }
+
+  NS_DispatchToMainThread(r);
+}
+
+NS_IMETHODIMP
+nsCategoryManager::GetCategoryEntry(const char* aCategoryName,
+                                    const char* aEntryName,
+                                    char** aResult)
+{
+  if (NS_WARN_IF(!aCategoryName) ||
+      NS_WARN_IF(!aEntryName) ||
+      NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsresult status = NS_ERROR_NOT_AVAILABLE;
+
+  CategoryNode* category;
+  {
+    MutexAutoLock lock(mLock);
+    category = get_category(aCategoryName);
+  }
+
+  if (category) {
+    status = category->GetLeaf(aEntryName, aResult);
+  }
+
+  return status;
+}
+
+NS_IMETHODIMP
+nsCategoryManager::AddCategoryEntry(const char* aCategoryName,
+                                    const char* aEntryName,
+                                    const char* aValue,
+                                    bool aPersist,
+                                    bool aReplace,
+                                    char** aResult)
+{
+  if (aPersist) {
+    NS_ERROR("Category manager doesn't support persistence.");
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  AddCategoryEntry(aCategoryName, aEntryName, aValue, aReplace, aResult);
+  return NS_OK;
+}
+
+void
+nsCategoryManager::AddCategoryEntry(const char* aCategoryName,
+                                    const char* aEntryName,
+                                    const char* aValue,
+                                    bool aReplace,
+                                    char** aOldValue)
+{
+  if (aOldValue) {
+    *aOldValue = nullptr;
+  }
+
+  // Before we can insert a new entry, we'll need to
+  //  find the |CategoryNode| to put it in...
+  CategoryNode* category;
+  {
+    MutexAutoLock lock(mLock);
+    category = get_category(aCategoryName);
+
+    if (!category) {
+      // That category doesn't exist yet; let's make it.
+      category = CategoryNode::Create(&mArena);
+
+      char* categoryName = ArenaStrdup(aCategoryName, &mArena);
+      mTable.Put(categoryName, category);
+    }
+  }
+
+  if (!category) {
+    return;
+  }
+
+  // We will need the return value of AddLeaf even if the called doesn't want it
+  char* oldEntry = nullptr;
+
+  nsresult rv = category->AddLeaf(aEntryName,
+                                  aValue,
+                                  aReplace,
+                                  &oldEntry,
+                                  &mArena);
+
+  if (NS_SUCCEEDED(rv)) {
+    if (oldEntry) {
+      NotifyObservers(NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID,
+                      aCategoryName, aEntryName);
+    }
+    NotifyObservers(NS_XPCOM_CATEGORY_ENTRY_ADDED_OBSERVER_ID,
+                    aCategoryName, aEntryName);
+
+    if (aOldValue) {
+      *aOldValue = oldEntry;
+    } else {
+      free(oldEntry);
+    }
+  }
+}
+
+NS_IMETHODIMP
+nsCategoryManager::DeleteCategoryEntry(const char* aCategoryName,
+                                       const char* aEntryName,
+                                       bool aDontPersist)
+{
+  if (NS_WARN_IF(!aCategoryName) ||
+      NS_WARN_IF(!aEntryName)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  /*
+    Note: no errors are reported since failure to delete
+    probably won't hurt you, and returning errors seriously
+    inconveniences JS clients
+  */
+
+  CategoryNode* category;
+  {
+    MutexAutoLock lock(mLock);
+    category = get_category(aCategoryName);
+  }
+
+  if (category) {
+    category->DeleteLeaf(aEntryName);
+
+    NotifyObservers(NS_XPCOM_CATEGORY_ENTRY_REMOVED_OBSERVER_ID,
+                    aCategoryName, aEntryName);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsCategoryManager::DeleteCategory(const char* aCategoryName)
+{
+  if (NS_WARN_IF(!aCategoryName)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // the categories are arena-allocated, so we don't
+  // actually delete them. We just remove all of the
+  // leaf nodes.
+
+  CategoryNode* category;
+  {
+    MutexAutoLock lock(mLock);
+    category = get_category(aCategoryName);
+  }
+
+  if (category) {
+    category->Clear();
+    NotifyObservers(NS_XPCOM_CATEGORY_CLEARED_OBSERVER_ID,
+                    aCategoryName, nullptr);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsCategoryManager::EnumerateCategory(const char* aCategoryName,
+                                     nsISimpleEnumerator** aResult)
+{
+  if (NS_WARN_IF(!aCategoryName) ||
+      NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  CategoryNode* category;
+  {
+    MutexAutoLock lock(mLock);
+    category = get_category(aCategoryName);
+  }
+
+  if (!category) {
+    return NS_NewEmptyEnumerator(aResult);
+  }
+
+  return category->Enumerate(aResult);
+}
+
+NS_IMETHODIMP
+nsCategoryManager::EnumerateCategories(nsISimpleEnumerator** aResult)
+{
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  MutexAutoLock lock(mLock);
+  CategoryEnumerator* enumObj = CategoryEnumerator::Create(mTable);
+
+  if (!enumObj) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  *aResult = enumObj;
+  NS_ADDREF(*aResult);
+  return NS_OK;
+}
+
+struct writecat_struct
+{
+  PRFileDesc* fd;
+  bool        success;
+};
+
+nsresult
+nsCategoryManager::SuppressNotifications(bool aSuppress)
+{
+  mSuppressNotifications = aSuppress;
+  return NS_OK;
+}
+
+/*
+ * CreateServicesFromCategory()
+ *
+ * Given a category, this convenience functions enumerates the category and
+ * creates a service of every CID or ContractID registered under the category.
+ * If observerTopic is non null and the service implements nsIObserver,
+ * this will attempt to notify the observer with the origin, observerTopic string
+ * as parameter.
+ */
+void
+NS_CreateServicesFromCategory(const char* aCategory,
+                              nsISupports* aOrigin,
+                              const char* aObserverTopic,
+                              const char16_t* aObserverData)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsICategoryManager> categoryManager =
+    do_GetService("@mozilla.org/categorymanager;1");
+  if (!categoryManager) {
+    return;
+  }
+
+  nsCOMPtr<nsISimpleEnumerator> enumerator;
+  rv = categoryManager->EnumerateCategory(aCategory,
+                                          getter_AddRefs(enumerator));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  nsCOMPtr<nsIUTF8StringEnumerator> senumerator =
+    do_QueryInterface(enumerator);
+  if (!senumerator) {
+    NS_WARNING("Category enumerator doesn't support nsIUTF8StringEnumerator.");
+    return;
+  }
+
+  bool hasMore;
+  while (NS_SUCCEEDED(senumerator->HasMore(&hasMore)) && hasMore) {
+    // From here on just skip any error we get.
+    nsAutoCString entryString;
+    if (NS_FAILED(senumerator->GetNext(entryString))) {
+      continue;
+    }
+
+    nsXPIDLCString contractID;
+    rv = categoryManager->GetCategoryEntry(aCategory, entryString.get(),
+                                           getter_Copies(contractID));
+    if (NS_FAILED(rv)) {
+      continue;
+    }
+
+    nsCOMPtr<nsISupports> instance = do_GetService(contractID);
+    if (!instance) {
+      LogMessage("While creating services from category '%s', could not create service for entry '%s', contract ID '%s'",
+                 aCategory, entryString.get(), contractID.get());
+      continue;
+    }
+
+    if (aObserverTopic) {
+      // try an observer, if it implements it.
+      nsCOMPtr<nsIObserver> observer = do_QueryInterface(instance);
+      if (observer) {
+        observer->Observe(aOrigin, aObserverTopic,
+                          aObserverData ? aObserverData : u"");
+      } else {
+        LogMessage("While creating services from category '%s', service for entry '%s', contract ID '%s' does not implement nsIObserver.",
+                   aCategory, entryString.get(), contractID.get());
+      }
+    }
+  }
+}
diff --git a/xpcom/components/nsCategoryManager.h b/xpcom/components/nsCategoryManager.h
new file mode 100644
index 000000000..3a4faed72
--- /dev/null
+++ b/xpcom/components/nsCategoryManager.h
@@ -0,0 +1,146 @@
+/* -*- 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 NSCATEGORYMANAGER_H
+#define NSCATEGORYMANAGER_H
+
+#include "prio.h"
+#include "plarena.h"
+#include "nsClassHashtable.h"
+#include "nsICategoryManager.h"
+#include "nsIMemoryReporter.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/Attributes.h"
+
+class nsIMemoryReporter;
+
+/* 16d222a6-1dd2-11b2-b693-f38b02c021b2 */
+#define NS_CATEGORYMANAGER_CID \
+{ 0x16d222a6, 0x1dd2, 0x11b2, \
+  {0xb6, 0x93, 0xf3, 0x8b, 0x02, 0xc0, 0x21, 0xb2} }
+
+/**
+ * a "leaf-node", managed by the nsCategoryNode hashtable.
+ *
+ * we need to keep a "persistent value" (which will be written to the registry)
+ * and a non-persistent value (for the current runtime): these are usually
+ * the same, except when aPersist==false. The strings are permanently arena-
+ * allocated, and will never go away.
+ */
+class CategoryLeaf : public nsDepCharHashKey
+{
+public:
+  explicit CategoryLeaf(const char* aKey) : nsDepCharHashKey(aKey), value(nullptr) {}
+  const char* value;
+};
+
+
+/**
+ * CategoryNode keeps a hashtable of its entries.
+ * the CategoryNode itself is permanently allocated in
+ * the arena.
+ */
+class CategoryNode
+{
+public:
+  nsresult GetLeaf(const char* aEntryName,
+                   char** aResult);
+
+  nsresult AddLeaf(const char* aEntryName,
+                   const char* aValue,
+                   bool aReplace,
+                   char** aResult,
+                   PLArenaPool* aArena);
+
+  void DeleteLeaf(const char* aEntryName);
+
+  void Clear()
+  {
+    mozilla::MutexAutoLock lock(mLock);
+    mTable.Clear();
+  }
+
+  uint32_t Count()
+  {
+    mozilla::MutexAutoLock lock(mLock);
+    uint32_t tCount = mTable.Count();
+    return tCount;
+  }
+
+  nsresult Enumerate(nsISimpleEnumerator** aResult);
+
+  // CategoryNode is arena-allocated, with the strings
+  static CategoryNode* Create(PLArenaPool* aArena);
+  ~CategoryNode();
+  void operator delete(void*) {}
+
+  size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf);
+
+private:
+  CategoryNode() : mLock("CategoryLeaf") {}
+
+  void* operator new(size_t aSize, PLArenaPool* aArena);
+
+  nsTHashtable<CategoryLeaf> mTable;
+  mozilla::Mutex mLock;
+};
+
+
+/**
+ * The main implementation of nsICategoryManager.
+ *
+ * This implementation is thread-safe.
+ */
+class nsCategoryManager final
+  : public nsICategoryManager
+  , public nsIMemoryReporter
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSICATEGORYMANAGER
+  NS_DECL_NSIMEMORYREPORTER
+
+  /**
+   * Suppress or unsuppress notifications of category changes to the
+   * observer service. This is to be used by nsComponentManagerImpl
+   * on startup while reading the stored category list.
+   */
+  nsresult SuppressNotifications(bool aSuppress);
+
+  void AddCategoryEntry(const char* aCategory,
+                        const char* aKey,
+                        const char* aValue,
+                        bool aReplace = true,
+                        char** aOldValue = nullptr);
+
+  static nsresult Create(nsISupports* aOuter, REFNSIID aIID, void** aResult);
+  void InitMemoryReporter();
+
+  static nsCategoryManager* GetSingleton();
+  static void Destroy();
+
+private:
+  static nsCategoryManager* gCategoryManager;
+
+  nsCategoryManager();
+  ~nsCategoryManager();
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
+
+  CategoryNode* get_category(const char* aName);
+  void NotifyObservers(const char* aTopic,
+                       const char* aCategoryName, // must be a static string
+                       const char* aEntryName);
+
+  PLArenaPool mArena;
+  nsClassHashtable<nsDepCharHashKey, CategoryNode> mTable;
+  mozilla::Mutex mLock;
+  bool mSuppressNotifications;
+};
+
+#endif
diff --git a/xpcom/components/nsCategoryManagerUtils.h b/xpcom/components/nsCategoryManagerUtils.h
new file mode 100644
index 000000000..a83d097c2
--- /dev/null
+++ b/xpcom/components/nsCategoryManagerUtils.h
@@ -0,0 +1,18 @@
+/* -*- 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 nsCategoryManagerUtils_h__
+#define nsCategoryManagerUtils_h__
+
+#include "nsICategoryManager.h"
+
+void
+NS_CreateServicesFromCategory(const char* aCategory,
+                              nsISupports* aOrigin,
+                              const char* aObserverTopic,
+                              const char16_t* aObserverData = nullptr);
+
+#endif
diff --git a/xpcom/components/nsComponentManager.cpp b/xpcom/components/nsComponentManager.cpp
new file mode 100644
index 000000000..b9eb8e275
--- /dev/null
+++ b/xpcom/components/nsComponentManager.cpp
@@ -0,0 +1,2083 @@
+/* -*- 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/.
+ *
+ * This Original Code has been modified by IBM Corporation.
+ * Modifications made by IBM described herein are
+ * Copyright (c) International Business Machines
+ * Corporation, 2000
+ *
+ * Modifications to Mozilla code or documentation
+ * identified per MPL Section 3.3
+ *
+ * Date             Modified by     Description of modification
+ * 04/20/2000       IBM Corp.      Added PR_CALLBACK for Optlink use in OS2
+ */
+
+#include <stdlib.h>
+#include "nscore.h"
+#include "nsISupports.h"
+#include "nspr.h"
+#include "nsCRT.h" // for atoll
+
+// Arena used by component manager for storing contractid string, dll
+// location strings and small objects
+// CAUTION: Arena align mask needs to be defined before including plarena.h
+//          currently from nsComponentManager.h
+#define PL_ARENA_CONST_ALIGN_MASK 7
+#define NS_CM_BLOCK_SIZE (1024 * 8)
+
+#include "nsCategoryManager.h"
+#include "nsCOMPtr.h"
+#include "nsComponentManager.h"
+#include "nsDirectoryService.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsCategoryManager.h"
+#include "nsCategoryManagerUtils.h"
+#include "xptiprivate.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/XPTInterfaceInfoManager.h"
+#include "nsIConsoleService.h"
+#include "nsIObserverService.h"
+#include "nsISimpleEnumerator.h"
+#include "nsIStringEnumerator.h"
+#include "nsXPCOM.h"
+#include "nsXPCOMPrivate.h"
+#include "nsISupportsPrimitives.h"
+#include "nsIClassInfo.h"
+#include "nsLocalFile.h"
+#include "nsReadableUtils.h"
+#include "nsString.h"
+#include "nsXPIDLString.h"
+#include "prcmon.h"
+#include "xptinfo.h" // this after nsISupports, to pick up IID so that xpt stuff doesn't try to define it itself...
+#include "nsThreadUtils.h"
+#include "prthread.h"
+#include "private/pprthred.h"
+#include "nsTArray.h"
+#include "prio.h"
+#include "ManifestParser.h"
+#include "nsNetUtil.h"
+#include "mozilla/Services.h"
+
+#include "mozilla/GenericFactory.h"
+#include "nsSupportsPrimitives.h"
+#include "nsArray.h"
+#include "nsIMutableArray.h"
+#include "nsArrayEnumerator.h"
+#include "nsStringEnumerator.h"
+#include "mozilla/FileUtils.h"
+#include "mozilla/UniquePtr.h"
+#include "nsDataHashtable.h"
+
+#include <new>     // for placement new
+
+#include "mozilla/Omnijar.h"
+
+#include "mozilla/Logging.h"
+#include "LogModulePrefWatcher.h"
+
+using namespace mozilla;
+
+static LazyLogModule nsComponentManagerLog("nsComponentManager");
+
+#if 0 || defined (DEBUG_timeless)
+ #define SHOW_DENIED_ON_SHUTDOWN
+ #define SHOW_CI_ON_EXISTING_SERVICE
+#endif
+
+// Bloated registry buffer size to improve startup performance -- needs to
+// be big enough to fit the entire file into memory or it'll thrash.
+// 512K is big enough to allow for some future growth in the registry.
+#define BIG_REGISTRY_BUFLEN   (512*1024)
+
+// Common Key Names
+const char xpcomComponentsKeyName[] = "software/mozilla/XPCOM/components";
+const char xpcomKeyName[] = "software/mozilla/XPCOM";
+
+// Common Value Names
+const char fileSizeValueName[] = "FileSize";
+const char lastModValueName[] = "LastModTimeStamp";
+const char nativeComponentType[] = "application/x-mozilla-native";
+const char staticComponentType[] = "application/x-mozilla-static";
+
+NS_DEFINE_CID(kCategoryManagerCID, NS_CATEGORYMANAGER_CID);
+
+#define UID_STRING_LENGTH 39
+
+nsresult
+nsGetServiceFromCategory::operator()(const nsIID& aIID,
+                                     void** aInstancePtr) const
+{
+  nsresult rv;
+  nsXPIDLCString value;
+  nsCOMPtr<nsICategoryManager> catman;
+  nsComponentManagerImpl* compMgr = nsComponentManagerImpl::gComponentManager;
+  if (!compMgr) {
+    rv = NS_ERROR_NOT_INITIALIZED;
+    goto error;
+  }
+
+  if (!mCategory || !mEntry) {
+    // when categories have defaults, use that for null mEntry
+    rv = NS_ERROR_NULL_POINTER;
+    goto error;
+  }
+
+  rv = compMgr->nsComponentManagerImpl::GetService(kCategoryManagerCID,
+                                                   NS_GET_IID(nsICategoryManager),
+                                                   getter_AddRefs(catman));
+  if (NS_FAILED(rv)) {
+    goto error;
+  }
+
+  /* find the contractID for category.entry */
+  rv = catman->GetCategoryEntry(mCategory, mEntry,
+                                getter_Copies(value));
+  if (NS_FAILED(rv)) {
+    goto error;
+  }
+  if (!value) {
+    rv = NS_ERROR_SERVICE_NOT_AVAILABLE;
+    goto error;
+  }
+
+  rv = compMgr->nsComponentManagerImpl::GetServiceByContractID(value,
+                                                               aIID,
+                                                               aInstancePtr);
+  if (NS_FAILED(rv)) {
+error:
+    *aInstancePtr = 0;
+  }
+  if (mErrorPtr) {
+    *mErrorPtr = rv;
+  }
+  return rv;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Arena helper functions
+////////////////////////////////////////////////////////////////////////////////
+char*
+ArenaStrndup(const char* aStr, uint32_t aLen, PLArenaPool* aArena)
+{
+  void* mem;
+  // Include trailing null in the aLen
+  PL_ARENA_ALLOCATE(mem, aArena, aLen + 1);
+  if (mem) {
+    memcpy(mem, aStr, aLen + 1);
+  }
+  return static_cast<char*>(mem);
+}
+
+char*
+ArenaStrdup(const char* aStr, PLArenaPool* aArena)
+{
+  return ArenaStrndup(aStr, strlen(aStr), aArena);
+}
+
+// GetService and a few other functions need to exit their mutex mid-function
+// without reentering it later in the block. This class supports that
+// style of early-exit that MutexAutoUnlock doesn't.
+
+namespace {
+
+class MOZ_STACK_CLASS MutexLock
+{
+public:
+  explicit MutexLock(SafeMutex& aMutex)
+    : mMutex(aMutex)
+    , mLocked(false)
+  {
+    Lock();
+  }
+
+  ~MutexLock()
+  {
+    if (mLocked) {
+      Unlock();
+    }
+  }
+
+  void Lock()
+  {
+    NS_ASSERTION(!mLocked, "Re-entering a mutex");
+    mMutex.Lock();
+    mLocked = true;
+  }
+
+  void Unlock()
+  {
+    NS_ASSERTION(mLocked, "Exiting a mutex that isn't held!");
+    mMutex.Unlock();
+    mLocked = false;
+  }
+
+private:
+  SafeMutex& mMutex;
+  bool mLocked;
+};
+
+} // namespace
+
+// this is safe to call during InitXPCOM
+static already_AddRefed<nsIFile>
+GetLocationFromDirectoryService(const char* aProp)
+{
+  nsCOMPtr<nsIProperties> directoryService;
+  nsDirectoryService::Create(nullptr,
+                             NS_GET_IID(nsIProperties),
+                             getter_AddRefs(directoryService));
+
+  if (!directoryService) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = directoryService->Get(aProp,
+                                      NS_GET_IID(nsIFile),
+                                      getter_AddRefs(file));
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+
+  return file.forget();
+}
+
+static already_AddRefed<nsIFile>
+CloneAndAppend(nsIFile* aBase, const nsACString& aAppend)
+{
+  nsCOMPtr<nsIFile> f;
+  aBase->Clone(getter_AddRefs(f));
+  if (!f) {
+    return nullptr;
+  }
+
+  f->AppendNative(aAppend);
+  return f.forget();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsComponentManagerImpl
+////////////////////////////////////////////////////////////////////////////////
+
+nsresult
+nsComponentManagerImpl::Create(nsISupports* aOuter, REFNSIID aIID,
+                               void** aResult)
+{
+  if (aOuter) {
+    return NS_ERROR_NO_AGGREGATION;
+  }
+
+  if (!gComponentManager) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return gComponentManager->QueryInterface(aIID, aResult);
+}
+
+static const int CONTRACTID_HASHTABLE_INITIAL_LENGTH = 1024;
+
+nsComponentManagerImpl::nsComponentManagerImpl()
+  : mFactories(CONTRACTID_HASHTABLE_INITIAL_LENGTH)
+  , mContractIDs(CONTRACTID_HASHTABLE_INITIAL_LENGTH)
+  , mLock("nsComponentManagerImpl.mLock")
+  , mStatus(NOT_INITIALIZED)
+{
+}
+
+nsTArray<const mozilla::Module*>* nsComponentManagerImpl::sStaticModules;
+
+NSMODULE_DEFN(start_kPStaticModules);
+NSMODULE_DEFN(end_kPStaticModules);
+
+/* The content between start_kPStaticModules and end_kPStaticModules is gathered
+ * by the linker from various objects containing symbols in a specific section.
+ * ASAN considers (rightfully) the use of this content as a global buffer
+ * overflow. But this is a deliberate and well-considered choice, with no proper
+ * way to make ASAN happy. */
+MOZ_ASAN_BLACKLIST
+/* static */ void
+nsComponentManagerImpl::InitializeStaticModules()
+{
+  if (sStaticModules) {
+    return;
+  }
+
+  sStaticModules = new nsTArray<const mozilla::Module*>;
+  for (const mozilla::Module * const* staticModules =
+         &NSMODULE_NAME(start_kPStaticModules) + 1;
+       staticModules < &NSMODULE_NAME(end_kPStaticModules); ++staticModules)
+    if (*staticModules) { // ASAN adds padding
+      sStaticModules->AppendElement(*staticModules);
+    }
+}
+
+nsTArray<nsComponentManagerImpl::ComponentLocation>*
+nsComponentManagerImpl::sModuleLocations;
+
+/* static */ void
+nsComponentManagerImpl::InitializeModuleLocations()
+{
+  if (sModuleLocations) {
+    return;
+  }
+
+  sModuleLocations = new nsTArray<ComponentLocation>;
+}
+
+nsresult
+nsComponentManagerImpl::Init()
+{
+  MOZ_ASSERT(NOT_INITIALIZED == mStatus);
+
+  // Initialize our arena
+  PL_INIT_ARENA_POOL(&mArena, "ComponentManagerArena", NS_CM_BLOCK_SIZE);
+
+  nsCOMPtr<nsIFile> greDir =
+    GetLocationFromDirectoryService(NS_GRE_DIR);
+  nsCOMPtr<nsIFile> appDir =
+    GetLocationFromDirectoryService(NS_XPCOM_CURRENT_PROCESS_DIR);
+
+  InitializeStaticModules();
+
+  nsresult rv = mNativeModuleLoader.Init();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsCategoryManager::GetSingleton()->SuppressNotifications(true);
+
+  RegisterModule(&kXPCOMModule, nullptr);
+
+  for (uint32_t i = 0; i < sStaticModules->Length(); ++i) {
+    RegisterModule((*sStaticModules)[i], nullptr);
+  }
+
+  bool loadChromeManifests = (XRE_GetProcessType() != GeckoProcessType_GPU);
+  if (loadChromeManifests) {
+    // The overall order in which chrome.manifests are expected to be treated
+    // is the following:
+    // - greDir
+    // - greDir's omni.ja
+    // - appDir
+    // - appDir's omni.ja
+
+    InitializeModuleLocations();
+    ComponentLocation* cl = sModuleLocations->AppendElement();
+    nsCOMPtr<nsIFile> lf = CloneAndAppend(greDir,
+                                          NS_LITERAL_CSTRING("chrome.manifest"));
+    cl->type = NS_APP_LOCATION;
+    cl->location.Init(lf);
+
+    RefPtr<nsZipArchive> greOmnijar =
+      mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE);
+    if (greOmnijar) {
+      cl = sModuleLocations->AppendElement();
+      cl->type = NS_APP_LOCATION;
+      cl->location.Init(greOmnijar, "chrome.manifest");
+    }
+
+    bool equals = false;
+    appDir->Equals(greDir, &equals);
+    if (!equals) {
+      cl = sModuleLocations->AppendElement();
+      cl->type = NS_APP_LOCATION;
+      lf = CloneAndAppend(appDir, NS_LITERAL_CSTRING("chrome.manifest"));
+      cl->location.Init(lf);
+    }
+
+    RefPtr<nsZipArchive> appOmnijar =
+      mozilla::Omnijar::GetReader(mozilla::Omnijar::APP);
+    if (appOmnijar) {
+      cl = sModuleLocations->AppendElement();
+      cl->type = NS_APP_LOCATION;
+      cl->location.Init(appOmnijar, "chrome.manifest");
+    }
+
+    RereadChromeManifests(false);
+  }
+
+  nsCategoryManager::GetSingleton()->SuppressNotifications(false);
+
+  RegisterWeakMemoryReporter(this);
+
+  // NB: The logging preference watcher needs to be registered late enough in
+  // startup that it's okay to use the preference system, but also as soon as
+  // possible so that log modules enabled via preferences are turned on as
+  // early as possible.
+  //
+  // We can't initialize the preference watcher when the log module manager is
+  // initialized, as a number of things attempt to start logging before the
+  // preference system is initialized.
+  //
+  // The preference system is registered as a component so at this point during
+  // component manager initialization we know it is setup and we can register
+  // for notifications.
+  LogModulePrefWatcher::RegisterPrefWatcher();
+
+  // Unfortunately, we can't register the nsCategoryManager memory reporter
+  // in its constructor (which is triggered by the GetSingleton() call
+  // above) because the memory reporter manager isn't initialized at that
+  // point.  So we wait until now.
+  nsCategoryManager::GetSingleton()->InitMemoryReporter();
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
+         ("nsComponentManager: Initialized."));
+
+  mStatus = NORMAL;
+
+  return NS_OK;
+}
+
+static bool
+ProcessSelectorMatches(Module::ProcessSelector aSelector)
+{
+  GeckoProcessType type = XRE_GetProcessType();
+  if (type == GeckoProcessType_GPU) {
+    return !!(aSelector & Module::ALLOW_IN_GPU_PROCESS);
+  }
+
+  if (aSelector & Module::MAIN_PROCESS_ONLY) {
+    return type == GeckoProcessType_Default;
+  }
+  if (aSelector & Module::CONTENT_PROCESS_ONLY) {
+    return type == GeckoProcessType_Content;
+  }
+  return true;
+}
+
+static const int kModuleVersionWithSelector = 51;
+
+void
+nsComponentManagerImpl::RegisterModule(const mozilla::Module* aModule,
+                                       FileLocation* aFile)
+{
+  mLock.AssertNotCurrentThreadOwns();
+
+  if (aModule->mVersion >= kModuleVersionWithSelector &&
+      !ProcessSelectorMatches(aModule->selector))
+  {
+    return;
+  }
+
+  {
+    // Scope the monitor so that we don't hold it while calling into the
+    // category manager.
+    MutexLock lock(mLock);
+
+    KnownModule* m;
+    if (aFile) {
+      nsCString uri;
+      aFile->GetURIString(uri);
+      NS_ASSERTION(!mKnownModules.Get(uri),
+                   "Must not register a binary module twice.");
+
+      m = new KnownModule(aModule, *aFile);
+      mKnownModules.Put(uri, m);
+    } else {
+      m = new KnownModule(aModule);
+      mKnownStaticModules.AppendElement(m);
+    }
+
+    if (aModule->mCIDs) {
+      const mozilla::Module::CIDEntry* entry;
+      for (entry = aModule->mCIDs; entry->cid; ++entry) {
+        RegisterCIDEntryLocked(entry, m);
+      }
+    }
+
+    if (aModule->mContractIDs) {
+      const mozilla::Module::ContractIDEntry* entry;
+      for (entry = aModule->mContractIDs; entry->contractid; ++entry) {
+        RegisterContractIDLocked(entry);
+      }
+      MOZ_ASSERT(!entry->cid, "Incorrectly terminated contract list");
+    }
+  }
+
+  if (aModule->mCategoryEntries) {
+    const mozilla::Module::CategoryEntry* entry;
+    for (entry = aModule->mCategoryEntries; entry->category; ++entry)
+      nsCategoryManager::GetSingleton()->AddCategoryEntry(entry->category,
+                                                          entry->entry,
+                                                          entry->value);
+  }
+}
+
+void
+nsComponentManagerImpl::RegisterCIDEntryLocked(
+    const mozilla::Module::CIDEntry* aEntry,
+    KnownModule* aModule)
+{
+  mLock.AssertCurrentThreadOwns();
+
+  if (!ProcessSelectorMatches(aEntry->processSelector)) {
+    return;
+  }
+
+  nsFactoryEntry* f = mFactories.Get(*aEntry->cid);
+  if (f) {
+    NS_WARNING("Re-registering a CID?");
+
+    char idstr[NSID_LENGTH];
+    aEntry->cid->ToProvidedString(idstr);
+
+    nsCString existing;
+    if (f->mModule) {
+      existing = f->mModule->Description();
+    } else {
+      existing = "<unknown module>";
+    }
+    SafeMutexAutoUnlock unlock(mLock);
+    LogMessage("While registering XPCOM module %s, trying to re-register CID '%s' already registered by %s.",
+               aModule->Description().get(),
+               idstr,
+               existing.get());
+    return;
+  }
+
+  f = new nsFactoryEntry(aEntry, aModule);
+  mFactories.Put(*aEntry->cid, f);
+}
+
+void
+nsComponentManagerImpl::RegisterContractIDLocked(
+    const mozilla::Module::ContractIDEntry* aEntry)
+{
+  mLock.AssertCurrentThreadOwns();
+
+  if (!ProcessSelectorMatches(aEntry->processSelector)) {
+    return;
+  }
+
+  nsFactoryEntry* f = mFactories.Get(*aEntry->cid);
+  if (!f) {
+    NS_WARNING("No CID found when attempting to map contract ID");
+
+    char idstr[NSID_LENGTH];
+    aEntry->cid->ToProvidedString(idstr);
+
+    SafeMutexAutoUnlock unlock(mLock);
+    LogMessage("Could not map contract ID '%s' to CID %s because no implementation of the CID is registered.",
+               aEntry->contractid,
+               idstr);
+
+    return;
+  }
+
+  mContractIDs.Put(nsDependentCString(aEntry->contractid), f);
+}
+
+static void
+CutExtension(nsCString& aPath)
+{
+  int32_t dotPos = aPath.RFindChar('.');
+  if (kNotFound == dotPos) {
+    aPath.Truncate();
+  } else {
+    aPath.Cut(0, dotPos + 1);
+  }
+}
+
+static void
+DoRegisterManifest(NSLocationType aType,
+                   FileLocation& aFile,
+                   bool aChromeOnly,
+                   bool aXPTOnly)
+{
+  MOZ_ASSERT(!aXPTOnly || !nsComponentManagerImpl::gComponentManager);
+  uint32_t len;
+  FileLocation::Data data;
+  UniquePtr<char[]> buf;
+  nsresult rv = aFile.GetData(data);
+  if (NS_SUCCEEDED(rv)) {
+    rv = data.GetSize(&len);
+  }
+  if (NS_SUCCEEDED(rv)) {
+    buf = MakeUnique<char[]>(len + 1);
+    rv = data.Copy(buf.get(), len);
+  }
+  if (NS_SUCCEEDED(rv)) {
+    buf[len] = '\0';
+    ParseManifest(aType, aFile, buf.get(), aChromeOnly, aXPTOnly);
+  } else if (NS_BOOTSTRAPPED_LOCATION != aType) {
+    nsCString uri;
+    aFile.GetURIString(uri);
+    LogMessage("Could not read chrome manifest '%s'.", uri.get());
+  }
+}
+
+void
+nsComponentManagerImpl::RegisterManifest(NSLocationType aType,
+                                         FileLocation& aFile,
+                                         bool aChromeOnly)
+{
+  DoRegisterManifest(aType, aFile, aChromeOnly, false);
+}
+
+void
+nsComponentManagerImpl::ManifestManifest(ManifestProcessingContext& aCx,
+                                         int aLineNo, char* const* aArgv)
+{
+  char* file = aArgv[0];
+  FileLocation f(aCx.mFile, file);
+  RegisterManifest(aCx.mType, f, aCx.mChromeOnly);
+}
+
+void
+nsComponentManagerImpl::ManifestBinaryComponent(ManifestProcessingContext& aCx,
+                                                int aLineNo,
+                                                char* const* aArgv)
+{
+  if (aCx.mFile.IsZip()) {
+    NS_WARNING("Cannot load binary components from a jar.");
+    LogMessageWithContext(aCx.mFile, aLineNo,
+                          "Cannot load binary components from a jar.");
+    return;
+  }
+
+  FileLocation f(aCx.mFile, aArgv[0]);
+  nsCString uri;
+  f.GetURIString(uri);
+
+  if (mKnownModules.Get(uri)) {
+    NS_WARNING("Attempting to register a binary component twice.");
+    LogMessageWithContext(aCx.mFile, aLineNo,
+                          "Attempting to register a binary component twice.");
+    return;
+  }
+
+  const mozilla::Module* m = mNativeModuleLoader.LoadModule(f);
+  // The native module loader should report an error here, we don't have to
+  if (!m) {
+    return;
+  }
+
+  RegisterModule(m, &f);
+}
+
+static void
+DoRegisterXPT(FileLocation& aFile)
+{
+  uint32_t len;
+  FileLocation::Data data;
+  UniquePtr<char[]> buf;
+  nsresult rv = aFile.GetData(data);
+  if (NS_SUCCEEDED(rv)) {
+    rv = data.GetSize(&len);
+  }
+  if (NS_SUCCEEDED(rv)) {
+    buf = MakeUnique<char[]>(len);
+    rv = data.Copy(buf.get(), len);
+  }
+  if (NS_SUCCEEDED(rv)) {
+    XPTInterfaceInfoManager::GetSingleton()->RegisterBuffer(buf.get(), len);
+  } else {
+    nsCString uri;
+    aFile.GetURIString(uri);
+    LogMessage("Could not read '%s'.", uri.get());
+  }
+}
+
+void
+nsComponentManagerImpl::ManifestXPT(ManifestProcessingContext& aCx,
+                                    int aLineNo, char* const* aArgv)
+{
+  FileLocation f(aCx.mFile, aArgv[0]);
+  DoRegisterXPT(f);
+}
+
+void
+nsComponentManagerImpl::ManifestComponent(ManifestProcessingContext& aCx,
+                                          int aLineNo, char* const* aArgv)
+{
+  mLock.AssertNotCurrentThreadOwns();
+
+  char* id = aArgv[0];
+  char* file = aArgv[1];
+
+  nsID cid;
+  if (!cid.Parse(id)) {
+    LogMessageWithContext(aCx.mFile, aLineNo,
+                          "Malformed CID: '%s'.", id);
+    return;
+  }
+
+  // Precompute the hash/file data outside of the lock
+  FileLocation fl(aCx.mFile, file);
+  nsCString hash;
+  fl.GetURIString(hash);
+
+  MutexLock lock(mLock);
+  nsFactoryEntry* f = mFactories.Get(cid);
+  if (f) {
+    char idstr[NSID_LENGTH];
+    cid.ToProvidedString(idstr);
+
+    nsCString existing;
+    if (f->mModule) {
+      existing = f->mModule->Description();
+    } else {
+      existing = "<unknown module>";
+    }
+
+    lock.Unlock();
+
+    LogMessageWithContext(aCx.mFile, aLineNo,
+                          "Trying to re-register CID '%s' already registered by %s.",
+                          idstr,
+                          existing.get());
+    return;
+  }
+
+  KnownModule* km;
+
+  km = mKnownModules.Get(hash);
+  if (!km) {
+    km = new KnownModule(fl);
+    mKnownModules.Put(hash, km);
+  }
+
+  void* place;
+
+  PL_ARENA_ALLOCATE(place, &mArena, sizeof(nsCID));
+  nsID* permanentCID = static_cast<nsID*>(place);
+  *permanentCID = cid;
+
+  PL_ARENA_ALLOCATE(place, &mArena, sizeof(mozilla::Module::CIDEntry));
+  mozilla::Module::CIDEntry* e = new (place) mozilla::Module::CIDEntry();
+  e->cid = permanentCID;
+
+  f = new nsFactoryEntry(e, km);
+  mFactories.Put(cid, f);
+}
+
+void
+nsComponentManagerImpl::ManifestContract(ManifestProcessingContext& aCx,
+                                         int aLineNo, char* const* aArgv)
+{
+  mLock.AssertNotCurrentThreadOwns();
+
+  char* contract = aArgv[0];
+  char* id = aArgv[1];
+
+  nsID cid;
+  if (!cid.Parse(id)) {
+    LogMessageWithContext(aCx.mFile, aLineNo,
+                          "Malformed CID: '%s'.", id);
+    return;
+  }
+
+  MutexLock lock(mLock);
+  nsFactoryEntry* f = mFactories.Get(cid);
+  if (!f) {
+    lock.Unlock();
+    LogMessageWithContext(aCx.mFile, aLineNo,
+                          "Could not map contract ID '%s' to CID %s because no implementation of the CID is registered.",
+                          contract, id);
+    return;
+  }
+
+  mContractIDs.Put(nsDependentCString(contract), f);
+}
+
+void
+nsComponentManagerImpl::ManifestCategory(ManifestProcessingContext& aCx,
+                                         int aLineNo, char* const* aArgv)
+{
+  char* category = aArgv[0];
+  char* key = aArgv[1];
+  char* value = aArgv[2];
+
+  nsCategoryManager::GetSingleton()->
+  AddCategoryEntry(category, key, value);
+}
+
+void
+nsComponentManagerImpl::RereadChromeManifests(bool aChromeOnly)
+{
+  for (uint32_t i = 0; i < sModuleLocations->Length(); ++i) {
+    ComponentLocation& l = sModuleLocations->ElementAt(i);
+    RegisterManifest(l.type, l.location, aChromeOnly);
+  }
+}
+
+bool
+nsComponentManagerImpl::KnownModule::EnsureLoader()
+{
+  if (!mLoader) {
+    nsCString extension;
+    mFile.GetURIString(extension);
+    CutExtension(extension);
+    mLoader =
+      nsComponentManagerImpl::gComponentManager->LoaderForExtension(extension);
+  }
+  return !!mLoader;
+}
+
+bool
+nsComponentManagerImpl::KnownModule::Load()
+{
+  if (mFailed) {
+    return false;
+  }
+  if (!mModule) {
+    if (!EnsureLoader()) {
+      return false;
+    }
+
+    mModule = mLoader->LoadModule(mFile);
+
+    if (!mModule) {
+      mFailed = true;
+      return false;
+    }
+  }
+  if (!mLoaded) {
+    if (mModule->loadProc) {
+      nsresult rv = mModule->loadProc();
+      if (NS_FAILED(rv)) {
+        mFailed = true;
+        return false;
+      }
+    }
+    mLoaded = true;
+  }
+  return true;
+}
+
+nsCString
+nsComponentManagerImpl::KnownModule::Description() const
+{
+  nsCString s;
+  if (mFile) {
+    mFile.GetURIString(s);
+  } else {
+    s = "<static module>";
+  }
+  return s;
+}
+
+nsresult nsComponentManagerImpl::Shutdown(void)
+{
+  MOZ_ASSERT(NORMAL == mStatus);
+
+  mStatus = SHUTDOWN_IN_PROGRESS;
+
+  // Shutdown the component manager
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
+         ("nsComponentManager: Beginning Shutdown."));
+
+  UnregisterWeakMemoryReporter(this);
+
+  // Release all cached factories
+  mContractIDs.Clear();
+  mFactories.Clear(); // XXX release the objects, don't just clear
+  mLoaderMap.Clear();
+  mKnownModules.Clear();
+  mKnownStaticModules.Clear();
+
+  delete sStaticModules;
+  delete sModuleLocations;
+
+  // Unload libraries
+  mNativeModuleLoader.UnloadLibraries();
+
+  // delete arena for strings and small objects
+  PL_FinishArenaPool(&mArena);
+
+  mStatus = SHUTDOWN_COMPLETE;
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
+         ("nsComponentManager: Shutdown complete."));
+
+  return NS_OK;
+}
+
+nsComponentManagerImpl::~nsComponentManagerImpl()
+{
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
+         ("nsComponentManager: Beginning destruction."));
+
+  if (SHUTDOWN_COMPLETE != mStatus) {
+    Shutdown();
+  }
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
+         ("nsComponentManager: Destroyed."));
+}
+
+NS_IMPL_ISUPPORTS(nsComponentManagerImpl,
+                  nsIComponentManager,
+                  nsIServiceManager,
+                  nsIComponentRegistrar,
+                  nsISupportsWeakReference,
+                  nsIInterfaceRequestor,
+                  nsIMemoryReporter)
+
+nsresult
+nsComponentManagerImpl::GetInterface(const nsIID& aUuid, void** aResult)
+{
+  NS_WARNING("This isn't supported");
+  // fall through to QI as anything QIable is a superset of what can be
+  // got via the GetInterface()
+  return  QueryInterface(aUuid, aResult);
+}
+
+nsFactoryEntry*
+nsComponentManagerImpl::GetFactoryEntry(const char* aContractID,
+                                        uint32_t aContractIDLen)
+{
+  SafeMutexAutoLock lock(mLock);
+  return mContractIDs.Get(nsDependentCString(aContractID, aContractIDLen));
+}
+
+
+nsFactoryEntry*
+nsComponentManagerImpl::GetFactoryEntry(const nsCID& aClass)
+{
+  SafeMutexAutoLock lock(mLock);
+  return mFactories.Get(aClass);
+}
+
+already_AddRefed<nsIFactory>
+nsComponentManagerImpl::FindFactory(const nsCID& aClass)
+{
+  nsFactoryEntry* e = GetFactoryEntry(aClass);
+  if (!e) {
+    return nullptr;
+  }
+
+  return e->GetFactory();
+}
+
+already_AddRefed<nsIFactory>
+nsComponentManagerImpl::FindFactory(const char* aContractID,
+                                    uint32_t aContractIDLen)
+{
+  nsFactoryEntry* entry = GetFactoryEntry(aContractID, aContractIDLen);
+  if (!entry) {
+    return nullptr;
+  }
+
+  return entry->GetFactory();
+}
+
+/**
+ * GetClassObject()
+ *
+ * Given a classID, this finds the singleton ClassObject that implements the CID.
+ * Returns an interface of type aIID off the singleton classobject.
+ */
+NS_IMETHODIMP
+nsComponentManagerImpl::GetClassObject(const nsCID& aClass, const nsIID& aIID,
+                                       void** aResult)
+{
+  nsresult rv;
+
+  if (MOZ_LOG_TEST(nsComponentManagerLog, LogLevel::Debug)) {
+    char* buf = aClass.ToString();
+    PR_LogPrint("nsComponentManager: GetClassObject(%s)", buf);
+    if (buf) {
+      free(buf);
+    }
+  }
+
+  MOZ_ASSERT(aResult != nullptr);
+
+  nsCOMPtr<nsIFactory> factory = FindFactory(aClass);
+  if (!factory) {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  rv = factory->QueryInterface(aIID, aResult);
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
+         ("\t\tGetClassObject() %s", NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
+
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsComponentManagerImpl::GetClassObjectByContractID(const char* aContractID,
+                                                   const nsIID& aIID,
+                                                   void** aResult)
+{
+  if (NS_WARN_IF(!aResult) ||
+      NS_WARN_IF(!aContractID)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsresult rv;
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Debug,
+         ("nsComponentManager: GetClassObject(%s)", aContractID));
+
+  nsCOMPtr<nsIFactory> factory = FindFactory(aContractID, strlen(aContractID));
+  if (!factory) {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  rv = factory->QueryInterface(aIID, aResult);
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
+         ("\t\tGetClassObject() %s", NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
+
+  return rv;
+}
+
+/**
+ * CreateInstance()
+ *
+ * Create an instance of an object that implements an interface and belongs
+ * to the implementation aClass using the factory. The factory is immediately
+ * released and not held onto for any longer.
+ */
+NS_IMETHODIMP
+nsComponentManagerImpl::CreateInstance(const nsCID& aClass,
+                                       nsISupports* aDelegate,
+                                       const nsIID& aIID,
+                                       void** aResult)
+{
+  // test this first, since there's no point in creating a component during
+  // shutdown -- whether it's available or not would depend on the order it
+  // occurs in the list
+  if (gXPCOMShuttingDown) {
+    // When processing shutdown, don't process new GetService() requests
+#ifdef SHOW_DENIED_ON_SHUTDOWN
+    nsXPIDLCString cid, iid;
+    cid.Adopt(aClass.ToString());
+    iid.Adopt(aIID.ToString());
+    fprintf(stderr, "Creating new instance on shutdown. Denied.\n"
+            "         CID: %s\n         IID: %s\n", cid.get(), iid.get());
+#endif /* SHOW_DENIED_ON_SHUTDOWN */
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  if (!aResult) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  *aResult = nullptr;
+
+  nsFactoryEntry* entry = GetFactoryEntry(aClass);
+
+  if (!entry) {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+#ifdef SHOW_CI_ON_EXISTING_SERVICE
+  if (entry->mServiceObject) {
+    nsXPIDLCString cid;
+    cid.Adopt(aClass.ToString());
+    nsAutoCString message;
+    message = NS_LITERAL_CSTRING("You are calling CreateInstance \"") +
+              cid +
+              NS_LITERAL_CSTRING("\" when a service for this CID already exists!");
+    NS_ERROR(message.get());
+  }
+#endif
+
+  nsresult rv;
+  nsCOMPtr<nsIFactory> factory = entry->GetFactory();
+  if (factory) {
+    rv = factory->CreateInstance(aDelegate, aIID, aResult);
+    if (NS_SUCCEEDED(rv) && !*aResult) {
+      NS_ERROR("Factory did not return an object but returned success!");
+      rv = NS_ERROR_SERVICE_NOT_FOUND;
+    }
+  } else {
+    // Translate error values
+    rv = NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  if (MOZ_LOG_TEST(nsComponentManagerLog, LogLevel::Warning)) {
+    char* buf = aClass.ToString();
+    MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
+           ("nsComponentManager: CreateInstance(%s) %s", buf,
+            NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
+    if (buf) {
+      free(buf);
+    }
+  }
+
+  return rv;
+}
+
+/**
+ * CreateInstanceByContractID()
+ *
+ * A variant of CreateInstance() that creates an instance of the object that
+ * implements the interface aIID and whose implementation has a contractID aContractID.
+ *
+ * This is only a convenience routine that turns around can calls the
+ * CreateInstance() with classid and iid.
+ */
+NS_IMETHODIMP
+nsComponentManagerImpl::CreateInstanceByContractID(const char* aContractID,
+                                                   nsISupports* aDelegate,
+                                                   const nsIID& aIID,
+                                                   void** aResult)
+{
+  if (NS_WARN_IF(!aContractID)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // test this first, since there's no point in creating a component during
+  // shutdown -- whether it's available or not would depend on the order it
+  // occurs in the list
+  if (gXPCOMShuttingDown) {
+    // When processing shutdown, don't process new GetService() requests
+#ifdef SHOW_DENIED_ON_SHUTDOWN
+    nsXPIDLCString iid;
+    iid.Adopt(aIID.ToString());
+    fprintf(stderr, "Creating new instance on shutdown. Denied.\n"
+            "  ContractID: %s\n         IID: %s\n", aContractID, iid.get());
+#endif /* SHOW_DENIED_ON_SHUTDOWN */
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  if (!aResult) {
+    return NS_ERROR_NULL_POINTER;
+  }
+  *aResult = nullptr;
+
+  nsFactoryEntry* entry = GetFactoryEntry(aContractID, strlen(aContractID));
+
+  if (!entry) {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+#ifdef SHOW_CI_ON_EXISTING_SERVICE
+  if (entry->mServiceObject) {
+    nsAutoCString message;
+    message =
+      NS_LITERAL_CSTRING("You are calling CreateInstance \"") +
+      nsDependentCString(aContractID) +
+      NS_LITERAL_CSTRING("\" when a service for this CID already exists! "
+                         "Add it to abusedContracts to track down the service consumer.");
+    NS_ERROR(message.get());
+  }
+#endif
+
+  nsresult rv;
+  nsCOMPtr<nsIFactory> factory = entry->GetFactory();
+  if (factory) {
+
+    rv = factory->CreateInstance(aDelegate, aIID, aResult);
+    if (NS_SUCCEEDED(rv) && !*aResult) {
+      NS_ERROR("Factory did not return an object but returned success!");
+      rv = NS_ERROR_SERVICE_NOT_FOUND;
+    }
+  } else {
+    // Translate error values
+    rv = NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  MOZ_LOG(nsComponentManagerLog, LogLevel::Warning,
+         ("nsComponentManager: CreateInstanceByContractID(%s) %s", aContractID,
+          NS_SUCCEEDED(rv) ? "succeeded" : "FAILED"));
+
+  return rv;
+}
+
+nsresult
+nsComponentManagerImpl::FreeServices()
+{
+  NS_ASSERTION(gXPCOMShuttingDown,
+               "Must be shutting down in order to free all services");
+
+  if (!gXPCOMShuttingDown) {
+    return NS_ERROR_FAILURE;
+  }
+
+  for (auto iter = mFactories.Iter(); !iter.Done(); iter.Next()) {
+    nsFactoryEntry* entry = iter.UserData();
+    entry->mFactory = nullptr;
+    entry->mServiceObject = nullptr;
+  }
+
+  return NS_OK;
+}
+
+// This should only ever be called within the monitor!
+nsComponentManagerImpl::PendingServiceInfo*
+nsComponentManagerImpl::AddPendingService(const nsCID& aServiceCID,
+                                          PRThread* aThread)
+{
+  PendingServiceInfo* newInfo = mPendingServices.AppendElement();
+  if (newInfo) {
+    newInfo->cid = &aServiceCID;
+    newInfo->thread = aThread;
+  }
+  return newInfo;
+}
+
+// This should only ever be called within the monitor!
+void
+nsComponentManagerImpl::RemovePendingService(const nsCID& aServiceCID)
+{
+  uint32_t pendingCount = mPendingServices.Length();
+  for (uint32_t index = 0; index < pendingCount; ++index) {
+    const PendingServiceInfo& info = mPendingServices.ElementAt(index);
+    if (info.cid->Equals(aServiceCID)) {
+      mPendingServices.RemoveElementAt(index);
+      return;
+    }
+  }
+}
+
+// This should only ever be called within the monitor!
+PRThread*
+nsComponentManagerImpl::GetPendingServiceThread(const nsCID& aServiceCID) const
+{
+  uint32_t pendingCount = mPendingServices.Length();
+  for (uint32_t index = 0; index < pendingCount; ++index) {
+    const PendingServiceInfo& info = mPendingServices.ElementAt(index);
+    if (info.cid->Equals(aServiceCID)) {
+      return info.thread;
+    }
+  }
+  return nullptr;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::GetService(const nsCID& aClass,
+                                   const nsIID& aIID,
+                                   void** aResult)
+{
+  // test this first, since there's no point in returning a service during
+  // shutdown -- whether it's available or not would depend on the order it
+  // occurs in the list
+  if (gXPCOMShuttingDown) {
+    // When processing shutdown, don't process new GetService() requests
+#ifdef SHOW_DENIED_ON_SHUTDOWN
+    nsXPIDLCString cid, iid;
+    cid.Adopt(aClass.ToString());
+    iid.Adopt(aIID.ToString());
+    fprintf(stderr, "Getting service on shutdown. Denied.\n"
+            "         CID: %s\n         IID: %s\n", cid.get(), iid.get());
+#endif /* SHOW_DENIED_ON_SHUTDOWN */
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // `service` must be released after the lock is released, so it must be
+  // declared before the lock in this C++ block.
+  nsCOMPtr<nsISupports> service;
+  MutexLock lock(mLock);
+
+  nsFactoryEntry* entry = mFactories.Get(aClass);
+  if (!entry) {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  if (entry->mServiceObject) {
+    lock.Unlock();
+    return entry->mServiceObject->QueryInterface(aIID, aResult);
+  }
+
+  PRThread* currentPRThread = PR_GetCurrentThread();
+  MOZ_ASSERT(currentPRThread, "This should never be null!");
+
+  // Needed to optimize the event loop below.
+  nsIThread* currentThread = nullptr;
+
+  PRThread* pendingPRThread;
+  while ((pendingPRThread = GetPendingServiceThread(aClass))) {
+    if (pendingPRThread == currentPRThread) {
+      NS_ERROR("Recursive GetService!");
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+
+
+    SafeMutexAutoUnlock unlockPending(mLock);
+
+    if (!currentThread) {
+      currentThread = NS_GetCurrentThread();
+      MOZ_ASSERT(currentThread, "This should never be null!");
+    }
+
+    // This will process a single event or yield the thread if no event is
+    // pending.
+    if (!NS_ProcessNextEvent(currentThread, false)) {
+      PR_Sleep(PR_INTERVAL_NO_WAIT);
+    }
+  }
+
+  // It's still possible that the other thread failed to create the
+  // service so we're not guaranteed to have an entry or service yet.
+  if (entry->mServiceObject) {
+    lock.Unlock();
+    return entry->mServiceObject->QueryInterface(aIID, aResult);
+  }
+
+#ifdef DEBUG
+  PendingServiceInfo* newInfo =
+#endif
+    AddPendingService(aClass, currentPRThread);
+  NS_ASSERTION(newInfo, "Failed to add info to the array!");
+
+  // We need to not be holding the service manager's lock while calling
+  // CreateInstance, because it invokes user code which could try to re-enter
+  // the service manager:
+
+  nsresult rv;
+  {
+    SafeMutexAutoUnlock unlock(mLock);
+    rv = CreateInstance(aClass, nullptr, aIID, getter_AddRefs(service));
+  }
+  if (NS_SUCCEEDED(rv) && !service) {
+    NS_ERROR("Factory did not return an object but returned success");
+    return NS_ERROR_SERVICE_NOT_FOUND;
+  }
+
+#ifdef DEBUG
+  pendingPRThread = GetPendingServiceThread(aClass);
+  MOZ_ASSERT(pendingPRThread == currentPRThread,
+             "Pending service array has been changed!");
+#endif
+  RemovePendingService(aClass);
+
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  NS_ASSERTION(!entry->mServiceObject, "Created two instances of a service!");
+
+  entry->mServiceObject = service.forget();
+
+  lock.Unlock();
+  nsISupports** sresult = reinterpret_cast<nsISupports**>(aResult);
+  *sresult = entry->mServiceObject;
+  (*sresult)->AddRef();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::IsServiceInstantiated(const nsCID& aClass,
+                                              const nsIID& aIID,
+                                              bool* aResult)
+{
+  // Now we want to get the service if we already got it. If not, we don't want
+  // to create an instance of it. mmh!
+
+  // test this first, since there's no point in returning a service during
+  // shutdown -- whether it's available or not would depend on the order it
+  // occurs in the list
+  if (gXPCOMShuttingDown) {
+    // When processing shutdown, don't process new GetService() requests
+#ifdef SHOW_DENIED_ON_SHUTDOWN
+    nsXPIDLCString cid, iid;
+    cid.Adopt(aClass.ToString());
+    iid.Adopt(aIID.ToString());
+    fprintf(stderr, "Checking for service on shutdown. Denied.\n"
+            "         CID: %s\n         IID: %s\n", cid.get(), iid.get());
+#endif /* SHOW_DENIED_ON_SHUTDOWN */
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult rv = NS_ERROR_SERVICE_NOT_AVAILABLE;
+  nsFactoryEntry* entry;
+
+  {
+    SafeMutexAutoLock lock(mLock);
+    entry = mFactories.Get(aClass);
+  }
+
+  if (entry && entry->mServiceObject) {
+    nsCOMPtr<nsISupports> service;
+    rv = entry->mServiceObject->QueryInterface(aIID, getter_AddRefs(service));
+    *aResult = (service != nullptr);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::IsServiceInstantiatedByContractID(
+    const char* aContractID,
+    const nsIID& aIID,
+    bool* aResult)
+{
+  // Now we want to get the service if we already got it. If not, we don't want
+  // to create an instance of it. mmh!
+
+  // test this first, since there's no point in returning a service during
+  // shutdown -- whether it's available or not would depend on the order it
+  // occurs in the list
+  if (gXPCOMShuttingDown) {
+    // When processing shutdown, don't process new GetService() requests
+#ifdef SHOW_DENIED_ON_SHUTDOWN
+    nsXPIDLCString iid;
+    iid.Adopt(aIID.ToString());
+    fprintf(stderr, "Checking for service on shutdown. Denied.\n"
+            "  ContractID: %s\n         IID: %s\n", aContractID, iid.get());
+#endif /* SHOW_DENIED_ON_SHUTDOWN */
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult rv = NS_ERROR_SERVICE_NOT_AVAILABLE;
+  nsFactoryEntry* entry;
+  {
+    SafeMutexAutoLock lock(mLock);
+    entry = mContractIDs.Get(nsDependentCString(aContractID));
+  }
+
+  if (entry && entry->mServiceObject) {
+    nsCOMPtr<nsISupports> service;
+    rv = entry->mServiceObject->QueryInterface(aIID, getter_AddRefs(service));
+    *aResult = (service != nullptr);
+  }
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsComponentManagerImpl::GetServiceByContractID(const char* aContractID,
+                                               const nsIID& aIID,
+                                               void** aResult)
+{
+  // test this first, since there's no point in returning a service during
+  // shutdown -- whether it's available or not would depend on the order it
+  // occurs in the list
+  if (gXPCOMShuttingDown) {
+    // When processing shutdown, don't process new GetService() requests
+#ifdef SHOW_DENIED_ON_SHUTDOWN
+    nsXPIDLCString iid;
+    iid.Adopt(aIID.ToString());
+    fprintf(stderr, "Getting service on shutdown. Denied.\n"
+            "  ContractID: %s\n         IID: %s\n", aContractID, iid.get());
+#endif /* SHOW_DENIED_ON_SHUTDOWN */
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  // `service` must be released after the lock is released, so it must be
+  // declared before the lock in this C++ block.
+  nsCOMPtr<nsISupports> service;
+  MutexLock lock(mLock);
+
+  nsFactoryEntry* entry = mContractIDs.Get(nsDependentCString(aContractID));
+  if (!entry) {
+    return NS_ERROR_FACTORY_NOT_REGISTERED;
+  }
+
+  if (entry->mServiceObject) {
+    // We need to not be holding the service manager's monitor while calling
+    // QueryInterface, because it invokes user code which could try to re-enter
+    // the service manager, or try to grab some other lock/monitor/condvar
+    // and deadlock, e.g. bug 282743.
+    // `entry` is valid until XPCOM shutdown, so we can safely use it after
+    // exiting the lock.
+    lock.Unlock();
+    return entry->mServiceObject->QueryInterface(aIID, aResult);
+  }
+
+  PRThread* currentPRThread = PR_GetCurrentThread();
+  MOZ_ASSERT(currentPRThread, "This should never be null!");
+
+  // Needed to optimize the event loop below.
+  nsIThread* currentThread = nullptr;
+
+  PRThread* pendingPRThread;
+  while ((pendingPRThread = GetPendingServiceThread(*entry->mCIDEntry->cid))) {
+    if (pendingPRThread == currentPRThread) {
+      NS_ERROR("Recursive GetService!");
+      return NS_ERROR_NOT_AVAILABLE;
+    }
+
+    SafeMutexAutoUnlock unlockPending(mLock);
+
+    if (!currentThread) {
+      currentThread = NS_GetCurrentThread();
+      MOZ_ASSERT(currentThread, "This should never be null!");
+    }
+
+    // This will process a single event or yield the thread if no event is
+    // pending.
+    if (!NS_ProcessNextEvent(currentThread, false)) {
+      PR_Sleep(PR_INTERVAL_NO_WAIT);
+    }
+  }
+
+  if (currentThread && entry->mServiceObject) {
+    // If we have a currentThread then we must have waited on another thread
+    // to create the service. Grab it now if that succeeded.
+    lock.Unlock();
+    return entry->mServiceObject->QueryInterface(aIID, aResult);
+  }
+
+#ifdef DEBUG
+  PendingServiceInfo* newInfo =
+#endif
+    AddPendingService(*entry->mCIDEntry->cid, currentPRThread);
+  NS_ASSERTION(newInfo, "Failed to add info to the array!");
+
+  // We need to not be holding the service manager's lock while calling
+  // CreateInstance, because it invokes user code which could try to re-enter
+  // the service manager:
+
+  nsresult rv;
+  {
+    SafeMutexAutoUnlock unlock(mLock);
+    rv = CreateInstanceByContractID(aContractID, nullptr, aIID,
+                                    getter_AddRefs(service));
+  }
+  if (NS_SUCCEEDED(rv) && !service) {
+    NS_ERROR("Factory did not return an object but returned success");
+    return NS_ERROR_SERVICE_NOT_FOUND;
+  }
+
+#ifdef DEBUG
+  pendingPRThread = GetPendingServiceThread(*entry->mCIDEntry->cid);
+  MOZ_ASSERT(pendingPRThread == currentPRThread,
+             "Pending service array has been changed!");
+#endif
+  RemovePendingService(*entry->mCIDEntry->cid);
+
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  NS_ASSERTION(!entry->mServiceObject, "Created two instances of a service!");
+
+  entry->mServiceObject = service.forget();
+
+  lock.Unlock();
+
+  nsISupports** sresult = reinterpret_cast<nsISupports**>(aResult);
+  *sresult = entry->mServiceObject;
+  (*sresult)->AddRef();
+
+  return NS_OK;
+}
+
+already_AddRefed<mozilla::ModuleLoader>
+nsComponentManagerImpl::LoaderForExtension(const nsACString& aExt)
+{
+  nsCOMPtr<mozilla::ModuleLoader> loader = mLoaderMap.Get(aExt);
+  if (!loader) {
+    loader = do_GetServiceFromCategory("module-loader",
+                                       PromiseFlatCString(aExt).get());
+    if (!loader) {
+      return nullptr;
+    }
+
+    mLoaderMap.Put(aExt, loader);
+  }
+
+  return loader.forget();
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::RegisterFactory(const nsCID& aClass,
+                                        const char* aName,
+                                        const char* aContractID,
+                                        nsIFactory* aFactory)
+{
+  if (!aFactory) {
+    // If a null factory is passed in, this call just wants to reset
+    // the contract ID to point to an existing CID entry.
+    if (!aContractID) {
+      return NS_ERROR_INVALID_ARG;
+    }
+
+    SafeMutexAutoLock lock(mLock);
+    nsFactoryEntry* oldf = mFactories.Get(aClass);
+    if (!oldf) {
+      return NS_ERROR_FACTORY_NOT_REGISTERED;
+    }
+
+    mContractIDs.Put(nsDependentCString(aContractID), oldf);
+    return NS_OK;
+  }
+
+  nsAutoPtr<nsFactoryEntry> f(new nsFactoryEntry(aClass, aFactory));
+
+  SafeMutexAutoLock lock(mLock);
+  nsFactoryEntry* oldf = mFactories.Get(aClass);
+  if (oldf) {
+    return NS_ERROR_FACTORY_EXISTS;
+  }
+
+  if (aContractID) {
+    mContractIDs.Put(nsDependentCString(aContractID), f);
+  }
+
+  mFactories.Put(aClass, f.forget());
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::UnregisterFactory(const nsCID& aClass,
+                                          nsIFactory* aFactory)
+{
+  // Don't release the dying factory or service object until releasing
+  // the component manager monitor.
+  nsCOMPtr<nsIFactory> dyingFactory;
+  nsCOMPtr<nsISupports> dyingServiceObject;
+
+  {
+    SafeMutexAutoLock lock(mLock);
+    nsFactoryEntry* f = mFactories.Get(aClass);
+    if (!f || f->mFactory != aFactory) {
+      return NS_ERROR_FACTORY_NOT_REGISTERED;
+    }
+
+    mFactories.Remove(aClass);
+
+    // This might leave a stale contractid -> factory mapping in
+    // place, so null out the factory entry (see
+    // nsFactoryEntry::GetFactory)
+    f->mFactory.swap(dyingFactory);
+    f->mServiceObject.swap(dyingServiceObject);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::AutoRegister(nsIFile* aLocation)
+{
+  XRE_AddManifestLocation(NS_EXTENSION_LOCATION, aLocation);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::AutoUnregister(nsIFile* aLocation)
+{
+  NS_ERROR("AutoUnregister not implemented.");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::RegisterFactoryLocation(const nsCID& aCID,
+                                                const char* aClassName,
+                                                const char* aContractID,
+                                                nsIFile* aFile,
+                                                const char* aLoaderStr,
+                                                const char* aType)
+{
+  NS_ERROR("RegisterFactoryLocation not implemented.");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::UnregisterFactoryLocation(const nsCID& aCID,
+                                                  nsIFile* aFile)
+{
+  NS_ERROR("UnregisterFactoryLocation not implemented.");
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::IsCIDRegistered(const nsCID& aClass,
+                                        bool* aResult)
+{
+  *aResult = (nullptr != GetFactoryEntry(aClass));
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::IsContractIDRegistered(const char* aClass,
+                                               bool* aResult)
+{
+  if (NS_WARN_IF(!aClass)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsFactoryEntry* entry = GetFactoryEntry(aClass, strlen(aClass));
+
+  if (entry) {
+    // UnregisterFactory might have left a stale nsFactoryEntry in
+    // mContractIDs, so we should check to see whether this entry has
+    // anything useful.
+    *aResult = (bool(entry->mModule) ||
+                bool(entry->mFactory) ||
+                bool(entry->mServiceObject));
+  } else {
+    *aResult = false;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::EnumerateCIDs(nsISimpleEnumerator** aEnumerator)
+{
+  nsCOMArray<nsISupports> array;
+  for (auto iter = mFactories.Iter(); !iter.Done(); iter.Next()) {
+    const nsID& id = iter.Key();
+    nsCOMPtr<nsISupportsID> wrapper = new nsSupportsID();
+    wrapper->SetData(&id);
+    array.AppendObject(wrapper);
+  }
+  return NS_NewArrayEnumerator(aEnumerator, array);
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::EnumerateContractIDs(nsISimpleEnumerator** aEnumerator)
+{
+  nsTArray<nsCString>* array = new nsTArray<nsCString>;
+  for (auto iter = mContractIDs.Iter(); !iter.Done(); iter.Next()) {
+    const nsACString& contract = iter.Key();
+    array->AppendElement(contract);
+  }
+
+  nsCOMPtr<nsIUTF8StringEnumerator> e;
+  nsresult rv = NS_NewAdoptingUTF8StringEnumerator(getter_AddRefs(e), array);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return CallQueryInterface(e, aEnumerator);
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::CIDToContractID(const nsCID& aClass,
+                                        char** aResult)
+{
+  NS_ERROR("CIDTOContractID not implemented");
+  return NS_ERROR_FACTORY_NOT_REGISTERED;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::ContractIDToCID(const char* aContractID,
+                                        nsCID** aResult)
+{
+  {
+    SafeMutexAutoLock lock(mLock);
+    nsFactoryEntry* entry = mContractIDs.Get(nsDependentCString(aContractID));
+    if (entry) {
+      *aResult = (nsCID*)moz_xmalloc(sizeof(nsCID));
+      **aResult = *entry->mCIDEntry->cid;
+      return NS_OK;
+    }
+  }
+  *aResult = nullptr;
+  return NS_ERROR_FACTORY_NOT_REGISTERED;
+}
+
+MOZ_DEFINE_MALLOC_SIZE_OF(ComponentManagerMallocSizeOf)
+
+NS_IMETHODIMP
+nsComponentManagerImpl::CollectReports(nsIHandleReportCallback* aHandleReport,
+                                       nsISupports* aData, bool aAnonymize)
+{
+  MOZ_COLLECT_REPORT(
+    "explicit/xpcom/component-manager", KIND_HEAP, UNITS_BYTES,
+    SizeOfIncludingThis(ComponentManagerMallocSizeOf),
+    "Memory used for the XPCOM component manager.");
+
+  return NS_OK;
+}
+
+size_t
+nsComponentManagerImpl::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
+  const
+{
+  size_t n = aMallocSizeOf(this);
+
+  n += mLoaderMap.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  n += mFactories.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (auto iter = mFactories.ConstIter(); !iter.Done(); iter.Next()) {
+    n += iter.Data()->SizeOfIncludingThis(aMallocSizeOf);
+  }
+
+  n += mContractIDs.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (auto iter = mContractIDs.ConstIter(); !iter.Done(); iter.Next()) {
+    // We don't measure the nsFactoryEntry data because it's owned by
+    // mFactories (which is measured above).
+    n += iter.Key().SizeOfExcludingThisIfUnshared(aMallocSizeOf);
+  }
+
+  n += sStaticModules->ShallowSizeOfIncludingThis(aMallocSizeOf);
+  n += sModuleLocations->ShallowSizeOfIncludingThis(aMallocSizeOf);
+
+  n += mKnownStaticModules.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  n += mKnownModules.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  n += PL_SizeOfArenaPoolExcludingPool(&mArena, aMallocSizeOf);
+
+  n += mPendingServices.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+  // Measurement of the following members may be added later if DMD finds it is
+  // worthwhile:
+  // - mLoaderMap's keys and values
+  // - mMon
+  // - sStaticModules' entries
+  // - sModuleLocations' entries
+  // - mNativeModuleLoader
+  // - mKnownStaticModules' entries?
+  // - mKnownModules' keys and values?
+
+  return n;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// nsFactoryEntry
+////////////////////////////////////////////////////////////////////////////////
+
+nsFactoryEntry::nsFactoryEntry(const mozilla::Module::CIDEntry* aEntry,
+                               nsComponentManagerImpl::KnownModule* aModule)
+  : mCIDEntry(aEntry)
+  , mModule(aModule)
+{
+}
+
+nsFactoryEntry::nsFactoryEntry(const nsCID& aCID, nsIFactory* aFactory)
+  : mCIDEntry(nullptr)
+  , mModule(nullptr)
+  , mFactory(aFactory)
+{
+  mozilla::Module::CIDEntry* e = new mozilla::Module::CIDEntry();
+  nsCID* cid = new nsCID;
+  *cid = aCID;
+  e->cid = cid;
+  mCIDEntry = e;
+}
+
+nsFactoryEntry::~nsFactoryEntry()
+{
+  // If this was a RegisterFactory entry, we own the CIDEntry/CID
+  if (!mModule) {
+    delete mCIDEntry->cid;
+    delete mCIDEntry;
+  }
+}
+
+already_AddRefed<nsIFactory>
+nsFactoryEntry::GetFactory()
+{
+  nsComponentManagerImpl::gComponentManager->mLock.AssertNotCurrentThreadOwns();
+
+  if (!mFactory) {
+    // RegisterFactory then UnregisterFactory can leave an entry in mContractIDs
+    // pointing to an unusable nsFactoryEntry.
+    if (!mModule) {
+      return nullptr;
+    }
+
+    if (!mModule->Load()) {
+      return nullptr;
+    }
+
+    // Don't set mFactory directly, it needs to be locked
+    nsCOMPtr<nsIFactory> factory;
+
+    if (mModule->Module()->getFactoryProc) {
+      factory = mModule->Module()->getFactoryProc(*mModule->Module(),
+                                                  *mCIDEntry);
+    } else if (mCIDEntry->getFactoryProc) {
+      factory = mCIDEntry->getFactoryProc(*mModule->Module(), *mCIDEntry);
+    } else {
+      NS_ASSERTION(mCIDEntry->constructorProc, "no getfactory or constructor");
+      factory = new mozilla::GenericFactory(mCIDEntry->constructorProc);
+    }
+    if (!factory) {
+      return nullptr;
+    }
+
+    SafeMutexAutoLock lock(nsComponentManagerImpl::gComponentManager->mLock);
+    // Threads can race to set mFactory
+    if (!mFactory) {
+      factory.swap(mFactory);
+    }
+  }
+  nsCOMPtr<nsIFactory> factory = mFactory;
+  return factory.forget();
+}
+
+size_t
+nsFactoryEntry::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf)
+{
+  size_t n = aMallocSizeOf(this);
+
+  // Measurement of the following members may be added later if DMD finds it is
+  // worthwhile:
+  // - mCIDEntry;
+  // - mModule;
+  // - mFactory;
+  // - mServiceObject;
+
+  return n;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Static Access Functions
+////////////////////////////////////////////////////////////////////////////////
+
+nsresult
+NS_GetComponentManager(nsIComponentManager** aResult)
+{
+  if (!nsComponentManagerImpl::gComponentManager) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
+  return NS_OK;
+}
+
+nsresult
+NS_GetServiceManager(nsIServiceManager** aResult)
+{
+  if (!nsComponentManagerImpl::gComponentManager) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
+  return NS_OK;
+}
+
+
+nsresult
+NS_GetComponentRegistrar(nsIComponentRegistrar** aResult)
+{
+  if (!nsComponentManagerImpl::gComponentManager) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  NS_ADDREF(*aResult = nsComponentManagerImpl::gComponentManager);
+  return NS_OK;
+}
+
+EXPORT_XPCOM_API(nsresult)
+XRE_AddStaticComponent(const mozilla::Module* aComponent)
+{
+  nsComponentManagerImpl::InitializeStaticModules();
+  nsComponentManagerImpl::sStaticModules->AppendElement(aComponent);
+
+  if (nsComponentManagerImpl::gComponentManager &&
+      nsComponentManagerImpl::NORMAL ==
+        nsComponentManagerImpl::gComponentManager->mStatus) {
+    nsComponentManagerImpl::gComponentManager->RegisterModule(aComponent,
+                                                              nullptr);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::AddBootstrappedManifestLocation(nsIFile* aLocation)
+{
+  nsString path;
+  nsresult rv = aLocation->GetPath(path);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (Substring(path, path.Length() - 4).EqualsLiteral(".xpi")) {
+    return XRE_AddJarManifestLocation(NS_BOOTSTRAPPED_LOCATION, aLocation);
+  }
+
+  nsCOMPtr<nsIFile> manifest =
+    CloneAndAppend(aLocation, NS_LITERAL_CSTRING("chrome.manifest"));
+  return XRE_AddManifestLocation(NS_BOOTSTRAPPED_LOCATION, manifest);
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::RemoveBootstrappedManifestLocation(nsIFile* aLocation)
+{
+  nsCOMPtr<nsIChromeRegistry> cr = mozilla::services::GetChromeRegistryService();
+  if (!cr) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsString path;
+  nsresult rv = aLocation->GetPath(path);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsComponentManagerImpl::ComponentLocation elem;
+  elem.type = NS_BOOTSTRAPPED_LOCATION;
+
+  if (Substring(path, path.Length() - 4).EqualsLiteral(".xpi")) {
+    elem.location.Init(aLocation, "chrome.manifest");
+  } else {
+    nsCOMPtr<nsIFile> lf =
+      CloneAndAppend(aLocation, NS_LITERAL_CSTRING("chrome.manifest"));
+    elem.location.Init(lf);
+  }
+
+  // Remove reference.
+  nsComponentManagerImpl::sModuleLocations->RemoveElement(elem,
+                                                          ComponentLocationComparator());
+
+  rv = cr->CheckForNewChrome();
+  return rv;
+}
+
+NS_IMETHODIMP
+nsComponentManagerImpl::GetManifestLocations(nsIArray** aLocations)
+{
+  NS_ENSURE_ARG_POINTER(aLocations);
+  *aLocations = nullptr;
+
+  if (!sModuleLocations) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+
+  nsCOMPtr<nsIMutableArray> locations = nsArray::Create();
+  nsresult rv;
+  for (uint32_t i = 0; i < sModuleLocations->Length(); ++i) {
+    ComponentLocation& l = sModuleLocations->ElementAt(i);
+    FileLocation loc = l.location;
+    nsCString uriString;
+    loc.GetURIString(uriString);
+    nsCOMPtr<nsIURI> uri;
+    rv = NS_NewURI(getter_AddRefs(uri), uriString);
+    if (NS_SUCCEEDED(rv)) {
+      locations->AppendElement(uri, false);
+    }
+  }
+
+  locations.forget(aLocations);
+  return NS_OK;
+}
+
+EXPORT_XPCOM_API(nsresult)
+XRE_AddManifestLocation(NSLocationType aType, nsIFile* aLocation)
+{
+  nsComponentManagerImpl::InitializeModuleLocations();
+  nsComponentManagerImpl::ComponentLocation* c =
+    nsComponentManagerImpl::sModuleLocations->AppendElement();
+  c->type = aType;
+  c->location.Init(aLocation);
+
+  if (nsComponentManagerImpl::gComponentManager &&
+      nsComponentManagerImpl::NORMAL ==
+        nsComponentManagerImpl::gComponentManager->mStatus) {
+    nsComponentManagerImpl::gComponentManager->RegisterManifest(aType,
+                                                                c->location,
+                                                                false);
+  }
+
+  return NS_OK;
+}
+
+EXPORT_XPCOM_API(nsresult)
+XRE_AddJarManifestLocation(NSLocationType aType, nsIFile* aLocation)
+{
+  nsComponentManagerImpl::InitializeModuleLocations();
+  nsComponentManagerImpl::ComponentLocation* c =
+    nsComponentManagerImpl::sModuleLocations->AppendElement();
+
+  c->type = aType;
+  c->location.Init(aLocation, "chrome.manifest");
+
+  if (nsComponentManagerImpl::gComponentManager &&
+      nsComponentManagerImpl::NORMAL ==
+        nsComponentManagerImpl::gComponentManager->mStatus) {
+    nsComponentManagerImpl::gComponentManager->RegisterManifest(aType,
+                                                                c->location,
+                                                                false);
+  }
+
+  return NS_OK;
+}
+
diff --git a/xpcom/components/nsComponentManager.h b/xpcom/components/nsComponentManager.h
new file mode 100644
index 000000000..f0e0f684a
--- /dev/null
+++ b/xpcom/components/nsComponentManager.h
@@ -0,0 +1,363 @@
+/* -*- 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 nsComponentManager_h__
+#define nsComponentManager_h__
+
+#include "nsXPCOM.h"
+
+#include "xpcom-private.h"
+#include "nsIComponentManager.h"
+#include "nsIComponentRegistrar.h"
+#include "nsIMemoryReporter.h"
+#include "nsIServiceManager.h"
+#include "nsIFile.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Module.h"
+#include "mozilla/ModuleLoader.h"
+#include "mozilla/Mutex.h"
+#include "nsXULAppAPI.h"
+#include "nsNativeModuleLoader.h"
+#include "nsIFactory.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "PLDHashTable.h"
+#include "prtime.h"
+#include "nsCOMPtr.h"
+#include "nsAutoPtr.h"
+#include "nsWeakReference.h"
+#include "plarena.h"
+#include "nsCOMArray.h"
+#include "nsDataHashtable.h"
+#include "nsInterfaceHashtable.h"
+#include "nsClassHashtable.h"
+#include "nsTArray.h"
+
+#include "mozilla/Omnijar.h"
+#include "mozilla/Attributes.h"
+
+struct nsFactoryEntry;
+class nsIServiceManager;
+struct PRThread;
+
+#define NS_COMPONENTMANAGER_CID                      \
+{ /* 91775d60-d5dc-11d2-92fb-00e09805570f */         \
+    0x91775d60,                                      \
+    0xd5dc,                                          \
+    0x11d2,                                          \
+    {0x92, 0xfb, 0x00, 0xe0, 0x98, 0x05, 0x57, 0x0f} \
+}
+
+/* keys for registry use */
+extern const char xpcomKeyName[];
+extern const char xpcomComponentsKeyName[];
+extern const char lastModValueName[];
+extern const char fileSizeValueName[];
+extern const char nativeComponentType[];
+extern const char staticComponentType[];
+
+#ifdef DEBUG
+#define XPCOM_CHECK_PENDING_CIDS
+#endif
+////////////////////////////////////////////////////////////////////////////////
+
+extern const mozilla::Module kXPCOMModule;
+
+/**
+ * This is a wrapper around mozilla::Mutex which provides runtime
+ * checking for a deadlock where the same thread tries to lock a mutex while
+ * it is already locked. This checking is present in both debug and release
+ * builds.
+ */
+class SafeMutex
+{
+public:
+  explicit SafeMutex(const char* aName)
+    : mMutex(aName)
+    , mOwnerThread(nullptr)
+  {
+  }
+
+  ~SafeMutex() {}
+
+  void Lock()
+  {
+    AssertNotCurrentThreadOwns();
+    mMutex.Lock();
+    MOZ_ASSERT(mOwnerThread == nullptr);
+    mOwnerThread = PR_GetCurrentThread();
+  }
+
+  void Unlock()
+  {
+    MOZ_ASSERT(mOwnerThread == PR_GetCurrentThread());
+    mOwnerThread = nullptr;
+    mMutex.Unlock();
+  }
+
+  void AssertCurrentThreadOwns() const
+  {
+    // This method is a debug-only check
+    MOZ_ASSERT(mOwnerThread == PR_GetCurrentThread());
+  }
+
+  MOZ_NEVER_INLINE void AssertNotCurrentThreadOwns() const
+  {
+    // This method is a release-mode check
+    if (PR_GetCurrentThread() == mOwnerThread) {
+      MOZ_CRASH();
+    }
+  }
+
+private:
+  mozilla::Mutex mMutex;
+  mozilla::Atomic<PRThread*, mozilla::Relaxed> mOwnerThread;
+};
+
+typedef mozilla::BaseAutoLock<SafeMutex> SafeMutexAutoLock;
+typedef mozilla::BaseAutoUnlock<SafeMutex> SafeMutexAutoUnlock;
+
+class nsComponentManagerImpl final
+  : public nsIComponentManager
+  , public nsIServiceManager
+  , public nsSupportsWeakReference
+  , public nsIComponentRegistrar
+  , public nsIInterfaceRequestor
+  , public nsIMemoryReporter
+{
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIINTERFACEREQUESTOR
+  NS_DECL_NSICOMPONENTMANAGER
+  NS_DECL_NSICOMPONENTREGISTRAR
+  NS_DECL_NSIMEMORYREPORTER
+
+  static nsresult Create(nsISupports* aOuter, REFNSIID aIID, void** aResult);
+
+  nsresult RegistryLocationForFile(nsIFile* aFile,
+                                   nsCString& aResult);
+  nsresult FileForRegistryLocation(const nsCString& aLocation,
+                                   nsIFile** aSpec);
+
+  NS_DECL_NSISERVICEMANAGER
+
+  // nsComponentManagerImpl methods:
+  nsComponentManagerImpl();
+
+  static nsComponentManagerImpl* gComponentManager;
+  nsresult Init();
+
+  nsresult Shutdown(void);
+
+  nsresult FreeServices();
+
+  already_AddRefed<mozilla::ModuleLoader> LoaderForExtension(const nsACString& aExt);
+  nsInterfaceHashtable<nsCStringHashKey, mozilla::ModuleLoader> mLoaderMap;
+
+  already_AddRefed<nsIFactory> FindFactory(const nsCID& aClass);
+  already_AddRefed<nsIFactory> FindFactory(const char* aContractID,
+                                           uint32_t aContractIDLen);
+
+  already_AddRefed<nsIFactory> LoadFactory(nsFactoryEntry* aEntry);
+
+  nsFactoryEntry* GetFactoryEntry(const char* aContractID,
+                                  uint32_t aContractIDLen);
+  nsFactoryEntry* GetFactoryEntry(const nsCID& aClass);
+
+  nsDataHashtable<nsIDHashKey, nsFactoryEntry*> mFactories;
+  nsDataHashtable<nsCStringHashKey, nsFactoryEntry*> mContractIDs;
+
+  SafeMutex mLock;
+
+  static void InitializeStaticModules();
+  static void InitializeModuleLocations();
+
+  struct ComponentLocation
+  {
+    NSLocationType type;
+    mozilla::FileLocation location;
+  };
+
+  class ComponentLocationComparator
+  {
+  public:
+    bool Equals(const ComponentLocation& aA, const ComponentLocation& aB) const
+    {
+      return (aA.type == aB.type && aA.location.Equals(aB.location));
+    }
+  };
+
+  static nsTArray<const mozilla::Module*>* sStaticModules;
+  static nsTArray<ComponentLocation>* sModuleLocations;
+
+  nsNativeModuleLoader mNativeModuleLoader;
+
+  class KnownModule
+  {
+  public:
+    /**
+     * Static or binary module.
+     */
+    KnownModule(const mozilla::Module* aModule, mozilla::FileLocation& aFile)
+      : mModule(aModule)
+      , mFile(aFile)
+      , mLoaded(false)
+      , mFailed(false)
+    {
+    }
+
+    explicit KnownModule(const mozilla::Module* aModule)
+      : mModule(aModule)
+      , mLoaded(false)
+      , mFailed(false)
+    {
+    }
+
+    explicit KnownModule(mozilla::FileLocation& aFile)
+      : mModule(nullptr)
+      , mFile(aFile)
+      , mLoader(nullptr)
+      , mLoaded(false)
+      , mFailed(false)
+    {
+    }
+
+    ~KnownModule()
+    {
+      if (mLoaded && mModule->unloadProc) {
+        mModule->unloadProc();
+      }
+    }
+
+    bool EnsureLoader();
+    bool Load();
+
+    const mozilla::Module* Module() const { return mModule; }
+
+    /**
+     * For error logging, get a description of this module, either the
+     * file path, or <static module>.
+     */
+    nsCString Description() const;
+
+  private:
+    const mozilla::Module* mModule;
+    mozilla::FileLocation mFile;
+    nsCOMPtr<mozilla::ModuleLoader> mLoader;
+    bool mLoaded;
+    bool mFailed;
+  };
+
+  // The KnownModule is kept alive by these members, it is
+  // referenced by pointer from the factory entries.
+  nsTArray<nsAutoPtr<KnownModule>> mKnownStaticModules;
+  // The key is the URI string of the module
+  nsClassHashtable<nsCStringHashKey, KnownModule> mKnownModules;
+
+  // Mutex not held
+  void RegisterModule(const mozilla::Module* aModule,
+                      mozilla::FileLocation* aFile);
+
+
+  // Mutex held
+  void RegisterCIDEntryLocked(const mozilla::Module::CIDEntry* aEntry,
+                              KnownModule* aModule);
+  void RegisterContractIDLocked(const mozilla::Module::ContractIDEntry* aEntry);
+
+  // Mutex not held
+  void RegisterManifest(NSLocationType aType, mozilla::FileLocation& aFile,
+                        bool aChromeOnly);
+
+  struct ManifestProcessingContext
+  {
+    ManifestProcessingContext(NSLocationType aType,
+                              mozilla::FileLocation& aFile, bool aChromeOnly)
+      : mType(aType)
+      , mFile(aFile)
+      , mChromeOnly(aChromeOnly)
+    {
+    }
+
+    ~ManifestProcessingContext() {}
+
+    NSLocationType mType;
+    mozilla::FileLocation mFile;
+    bool mChromeOnly;
+  };
+
+  void ManifestManifest(ManifestProcessingContext& aCx, int aLineNo,
+                        char* const* aArgv);
+  void ManifestBinaryComponent(ManifestProcessingContext& aCx, int aLineNo,
+                               char* const* aArgv);
+  void ManifestXPT(ManifestProcessingContext& aCx, int aLineNo,
+                   char* const* aArgv);
+  void ManifestComponent(ManifestProcessingContext& aCx, int aLineNo,
+                         char* const* aArgv);
+  void ManifestContract(ManifestProcessingContext& aCx, int aLineNo,
+                        char* const* aArgv);
+  void ManifestCategory(ManifestProcessingContext& aCx, int aLineNo,
+                        char* const* aArgv);
+
+  void RereadChromeManifests(bool aChromeOnly = true);
+
+  // Shutdown
+  enum
+  {
+    NOT_INITIALIZED,
+    NORMAL,
+    SHUTDOWN_IN_PROGRESS,
+    SHUTDOWN_COMPLETE
+  } mStatus;
+
+  PLArenaPool   mArena;
+
+  struct PendingServiceInfo
+  {
+    const nsCID* cid;
+    PRThread* thread;
+  };
+
+  inline PendingServiceInfo* AddPendingService(const nsCID& aServiceCID,
+                                               PRThread* aThread);
+  inline void RemovePendingService(const nsCID& aServiceCID);
+  inline PRThread* GetPendingServiceThread(const nsCID& aServiceCID) const;
+
+  nsTArray<PendingServiceInfo> mPendingServices;
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+private:
+  ~nsComponentManagerImpl();
+};
+
+
+#define NS_MAX_FILENAME_LEN     1024
+
+#define NS_ERROR_IS_DIR NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_XPCOM, 24)
+
+struct nsFactoryEntry
+{
+  nsFactoryEntry(const mozilla::Module::CIDEntry* aEntry,
+                 nsComponentManagerImpl::KnownModule* aModule);
+
+  // nsIComponentRegistrar.registerFactory support
+  nsFactoryEntry(const nsCID& aClass, nsIFactory* aFactory);
+
+  ~nsFactoryEntry();
+
+  already_AddRefed<nsIFactory> GetFactory();
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
+
+  const mozilla::Module::CIDEntry* mCIDEntry;
+  nsComponentManagerImpl::KnownModule* mModule;
+
+  nsCOMPtr<nsIFactory>   mFactory;
+  nsCOMPtr<nsISupports>  mServiceObject;
+};
+
+#endif // nsComponentManager_h__
diff --git a/xpcom/components/nsICategoryManager.idl b/xpcom/components/nsICategoryManager.idl
new file mode 100644
index 000000000..e33d3ed8b
--- /dev/null
+++ b/xpcom/components/nsICategoryManager.idl
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsISupports.idl"
+
+interface nsISimpleEnumerator;
+
+/*
+ * nsICategoryManager
+ */
+
+[scriptable, uuid(3275b2cd-af6d-429a-80d7-f0c5120342ac)]
+interface nsICategoryManager : nsISupports
+{
+    /**
+     * Get the value for the given category's entry.
+     * @param aCategory The name of the category ("protocol")
+     * @param aEntry The entry you're looking for ("http")
+     * @return The value.
+     */
+    string getCategoryEntry(in string aCategory, in string aEntry);
+    
+    /**
+     * Add an entry to a category.
+     * @param aCategory The name of the category ("protocol")
+     * @param aEntry The entry to be added ("http")
+     * @param aValue The value for the entry ("moz.httprulez.1")
+     * @param aPersist Should this data persist between invocations?
+     * @param aReplace Should we replace an existing entry?
+     * @return Previous entry, if any
+     */
+    string addCategoryEntry(in string aCategory, in string aEntry,
+			    in string aValue, in boolean aPersist,
+			    in boolean aReplace);
+
+    /**
+     * Delete an entry from the category.
+     * @param aCategory The name of the category ("protocol")
+     * @param aEntry The entry to be added ("http")
+     * @param aPersist Delete persistent data from registry, if present?
+     */
+    void deleteCategoryEntry(in string aCategory, in string aEntry,
+                               in boolean aPersist);
+
+    /**
+     * Delete a category and all entries.
+     * @param aCategory The category to be deleted.
+     */
+    void deleteCategory(in string aCategory);
+
+    /**
+     * Enumerate the entries in a category.
+     * @param aCategory The category to be enumerated.
+     * @return a simple enumerator, each result QIs to
+     *         nsISupportsCString.
+     */
+    nsISimpleEnumerator enumerateCategory(in string aCategory);
+
+    /**
+     * Enumerate all existing categories
+     * @param aCategory The category to be enumerated.
+     * @return a simple enumerator, each result QIs to
+     *         nsISupportsCString.
+     */
+    nsISimpleEnumerator enumerateCategories();
+};
+
diff --git a/xpcom/components/nsIClassInfo.idl b/xpcom/components/nsIClassInfo.idl
new file mode 100644
index 000000000..639d12aa8
--- /dev/null
+++ b/xpcom/components/nsIClassInfo.idl
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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 "nsISupports.idl"
+
+interface nsIXPCScriptable;
+
+/**
+ * Provides information about a specific implementation class.  If you want
+ * your class to implement nsIClassInfo, see nsIClassInfoImpl.h for
+ * instructions--you most likely do not want to inherit from nsIClassInfo.
+ */
+
+[scriptable, uuid(a60569d7-d401-4677-ba63-2aa5971af25d)]
+interface nsIClassInfo : nsISupports
+{
+    /**
+     * Get an ordered list of the interface ids that instances of the class 
+     * promise to implement. Note that nsISupports is an implicit member 
+     * of any such list and need not be included. 
+     *
+     * Should set *count = 0 and *array = null and return NS_OK if getting the 
+     * list is not supported.
+     */
+    void getInterfaces(out uint32_t count, 
+                       [array, size_is(count), retval] out nsIIDPtr array);
+
+    /**
+     * Return an object to assist XPConnect in supplying JavaScript-specific
+     * behavior to callers of the instance object, or null if not needed.
+     */
+    nsIXPCScriptable getScriptableHelper();
+
+    /**
+     * A contract ID through which an instance of this class can be created
+     * (or accessed as a service, if |flags & SINGLETON|), or null.
+     */
+    readonly attribute string   contractID;
+
+    /**
+     * A human readable string naming the class, or null.
+     */
+    readonly attribute string   classDescription;
+
+    /**
+     * A class ID through which an instance of this class can be created
+     * (or accessed as a service, if |flags & SINGLETON|), or null.
+     */
+    readonly attribute nsCIDPtr classID;
+
+    /**
+     * Bitflags for 'flags' attribute.
+     */
+    const uint32_t SINGLETON            = 1 << 0;
+    const uint32_t THREADSAFE           = 1 << 1;
+    const uint32_t MAIN_THREAD_ONLY     = 1 << 2;
+    const uint32_t DOM_OBJECT           = 1 << 3;
+    const uint32_t PLUGIN_OBJECT        = 1 << 4;
+    const uint32_t SINGLETON_CLASSINFO  = 1 << 5;
+
+    /**
+     * 'flags' attribute bitflag: whether objects of this type implement
+     * nsIContent.
+     */
+    const uint32_t CONTENT_NODE         = 1 << 6;
+
+    // The high order bit is RESERVED for consumers of these flags. 
+    // No implementor of this interface should ever return flags 
+    // with this bit set.
+    const uint32_t RESERVED             = 1 << 31;
+
+
+    readonly attribute uint32_t flags;
+
+    /**
+     * Also a class ID through which an instance of this class can be created
+     * (or accessed as a service, if |flags & SINGLETON|).  If the class does
+     * not have a CID, it should return NS_ERROR_NOT_AVAILABLE.  This attribute
+     * exists so C++ callers can avoid allocating and freeing a CID, as would
+     * happen if they used classID.
+     */
+    [noscript] readonly attribute nsCID classIDNoAlloc;
+
+};
diff --git a/xpcom/components/nsIComponentManager.idl b/xpcom/components/nsIComponentManager.idl
new file mode 100644
index 000000000..1e5693a28
--- /dev/null
+++ b/xpcom/components/nsIComponentManager.idl
@@ -0,0 +1,106 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+/**
+ * The nsIComponentManager interface.
+ */
+
+#include "nsISupports.idl"
+
+interface nsIFile;
+interface nsIFactory;
+interface nsIArray;
+
+[scriptable, uuid(d604ffc3-1ba3-4f6c-b65f-1ed4199364c3)]
+interface nsIComponentManager : nsISupports
+{
+    /**
+     * getClassObject
+     *
+     * Returns the factory object that can be used to create instances of
+     * CID aClass
+     *
+     * @param aClass The classid of the factory that is being requested
+     */
+    void getClassObject(in nsCIDRef aClass,
+                        in nsIIDRef aIID,
+                        [iid_is(aIID),retval] out nsQIResult result);
+
+    /**
+     * getClassObjectByContractID
+     *
+     * Returns the factory object that can be used to create instances of
+     * CID aClass
+     *
+     * @param aClass The classid of the factory that is being requested
+     */
+    void getClassObjectByContractID(in string aContractID,
+                                    in nsIIDRef aIID,
+                                    [iid_is(aIID),retval] out nsQIResult result);
+
+
+   /**
+     * createInstance
+     *
+     * Create an instance of the CID aClass and return the interface aIID.
+     *
+     * @param aClass : ClassID of object instance requested
+     * @param aDelegate : Used for aggregation
+     * @param aIID : IID of interface requested
+     */
+    void createInstance(in nsCIDRef aClass, 
+                        in nsISupports aDelegate,
+                        in nsIIDRef aIID, 
+                        [iid_is(aIID),retval] out nsQIResult result);
+
+    /**
+     * createInstanceByContractID
+     *
+     * Create an instance of the CID that implements aContractID and return the
+     * interface aIID. 
+     *
+     * @param aContractID : aContractID of object instance requested
+     * @param aDelegate : Used for aggregation
+     * @param aIID : IID of interface requested
+     */
+    void createInstanceByContractID(in string aContractID,
+                                    in nsISupports aDelegate,
+                                    in nsIIDRef aIID, 
+                                    [iid_is(aIID),retval] out nsQIResult result);
+
+    /**
+     * addBootstrappedManifestLocation
+     *
+     * Adds a bootstrapped manifest location on runtime.
+     *
+     * @param aLocation : A directory where chrome.manifest resides,
+     *                    or an XPI with it on the root.
+     */
+    void addBootstrappedManifestLocation(in nsIFile aLocation);
+
+    /**
+     * removeBootstrappedManifestLocation
+     *
+     * Removes a bootstrapped manifest location on runtime.
+     *
+     * @param aLocation : A directory where chrome.manifest resides,
+     *                    or an XPI with it on the root.
+     */
+    void removeBootstrappedManifestLocation(in nsIFile aLocation);
+
+    /**
+     * getManifestLocations
+     *
+     * Get an array of nsIURIs of all registered and builtin manifest locations.
+     */
+    nsIArray getManifestLocations();
+};
+
+
+%{ C++
+#ifdef MOZILLA_INTERNAL_API
+#include "nsComponentManagerUtils.h"
+#endif
+%} C++
diff --git a/xpcom/components/nsIComponentRegistrar.idl b/xpcom/components/nsIComponentRegistrar.idl
new file mode 100644
index 000000000..e12acdf25
--- /dev/null
+++ b/xpcom/components/nsIComponentRegistrar.idl
@@ -0,0 +1,163 @@
+/* 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/. */
+
+/**
+ * The nsIComponentRegistrar interface.
+ */
+
+#include "nsISupports.idl"
+
+interface nsIFile;
+interface nsIFactory;
+interface nsISimpleEnumerator;
+
+[scriptable, uuid(2417cbfe-65ad-48a6-b4b6-eb84db174392)]
+interface nsIComponentRegistrar : nsISupports
+{
+    /**
+     * autoRegister
+     *
+     * Register a .manifest file, or an entire directory containing
+     * these files. Registration lasts for this run only, and is not cached.
+     *
+     * @note Formerly this method would register component files directly. This
+     *       is no longer supported.
+     */
+    void autoRegister(in nsIFile aSpec);
+
+    /**
+     * autoUnregister
+     * @status OBSOLETE: This method is no longer implemented, but preserved
+     *                   in this interface for binary compatibility with
+     *                   Mozilla 1.9.2.
+     */
+    void autoUnregister(in nsIFile aSpec);
+
+
+    /**
+     * registerFactory
+     *
+     * Register a factory with a given ContractID, CID and Class Name.
+     *
+     * @param aClass      : CID of object
+     * @param aClassName  : Class Name of CID (unused)
+     * @param aContractID : ContractID associated with CID aClass. May be null
+     *                      if no contract ID is needed.
+     * @param aFactory    : Factory that will be registered for CID aClass.
+     *                      If aFactory is null, the contract will be associated
+     *                      with a previously registered CID.
+     */
+    void registerFactory(in nsCIDRef aClass, 
+                         in string aClassName,
+                         in string aContractID, 
+                         in nsIFactory aFactory);
+
+    /**
+     * unregisterFactory
+     *
+     * Unregister a factory associated with CID aClass.
+     *
+     * @param aClass   : CID being unregistered
+     * @param aFactory : Factory previously registered to create instances of
+     *                   CID aClass.
+     *
+     * @throws NS_ERROR* Method failure.
+     */    
+    void unregisterFactory(in nsCIDRef aClass, 
+                           in nsIFactory aFactory);
+
+    /**
+     * registerFactoryLocation
+     * @status OBSOLETE: This method is no longer implemented, but preserved
+     *                   in this interface for binary compatibility with
+     *                   Mozilla 1.9.2.
+     */
+    void registerFactoryLocation(in nsCIDRef aClass, 
+                                 in string aClassName,
+                                 in string aContractID, 
+                                 in nsIFile aFile,
+                                 in string aLoaderStr, 
+                                 in string aType);
+
+    /**
+     * unregisterFactoryLocation
+     * @status OBSOLETE: This method is no longer implemented, but preserved
+     *                   in this interface for binary compatibility with
+     *                   Mozilla 1.9.2.
+     */    
+    void unregisterFactoryLocation(in nsCIDRef aClass, 
+                                   in nsIFile aFile);
+
+    /**
+     * isCIDRegistered
+     *
+     * Returns true if a factory is registered for the CID.
+     *
+     * @param aClass : CID queried for registeration
+     * @return       : true if a factory is registered for CID 
+     *                 false otherwise.
+     */
+    boolean isCIDRegistered(in nsCIDRef aClass);
+    
+    /**
+     * isContractIDRegistered
+     *
+     * Returns true if a factory is registered for the contract id.
+     *
+     * @param aClass : contract id queried for registeration
+     * @return       : true if a factory is registered for contract id 
+     *                 false otherwise.
+     */
+    boolean isContractIDRegistered(in string aContractID);
+
+    /**
+     * enumerateCIDs
+     *
+     * Enumerate the list of all registered CIDs.
+     *
+     * @return : enumerator for CIDs.  Elements of the enumeration can be QI'ed
+     *           for the nsISupportsID interface.  From the nsISupportsID, you 
+     *           can obtain the actual CID.
+     */
+    nsISimpleEnumerator enumerateCIDs();
+
+    /**
+     * enumerateContractIDs
+     *
+     * Enumerate the list of all registered ContractIDs.
+     *
+     * @return : enumerator for ContractIDs. Elements of the enumeration can be 
+     *           QI'ed for the nsISupportsCString interface.  From  the
+     *           nsISupportsCString interface, you can obtain the actual 
+     *           Contract ID string.
+     */
+    nsISimpleEnumerator enumerateContractIDs();
+
+    /**
+     * CIDToContractID
+     * @status OBSOLETE: This method is no longer implemented, but preserved
+     *                   in this interface for binary compatibility with
+     *                   Mozilla 1.9.2.
+     */
+    string   CIDToContractID(in nsCIDRef aClass);
+
+    /**
+     * contractIDToCID
+     *
+     * Returns the CID for a given Contract ID, if one exists and is registered.
+     *
+     * @return : Contract ID.
+     */
+    nsCIDPtr contractIDToCID(in string aContractID);
+};
+
+
+
+
+
+
+
+
+
+
diff --git a/xpcom/components/nsIFactory.idl b/xpcom/components/nsIFactory.idl
new file mode 100644
index 000000000..54152976f
--- /dev/null
+++ b/xpcom/components/nsIFactory.idl
@@ -0,0 +1,42 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsISupports.idl"
+
+/**
+ * A class factory allows the creation of nsISupports derived
+ * components without specifying a concrete base class.  
+ */
+
+[scriptable, object, uuid(00000001-0000-0000-c000-000000000046)]
+interface nsIFactory :  nsISupports {
+   /**
+    * Creates an instance of a component.
+    *
+    * @param aOuter Pointer to a component that wishes to be aggregated
+    *               in the resulting instance. This will be nullptr if no
+    *               aggregation is requested.
+    * @param iid    The IID of the interface being requested in
+    *               the component which is being currently created.
+    * @param result [out] Pointer to the newly created instance, if successful.
+    * @throws NS_NOINTERFACE - Interface not accessible.
+    * @throws NS_ERROR_NO_AGGREGATION - if an 'outer' object is supplied, but the
+    *                                   component is not aggregatable.
+    *         NS_ERROR* - Method failure.
+    */
+    void createInstance(in nsISupports aOuter, in nsIIDRef iid,
+                      [retval, iid_is(iid)] out nsQIResult result);
+
+   /**
+    * LockFactory provides the client a way to keep the component
+    * in memory until it is finished with it. The client can call
+    * LockFactory(PR_TRUE) to lock the factory and LockFactory(PR_FALSE)
+    * to release the factory.	 
+    *
+    * @param lock - Must be PR_TRUE or PR_FALSE
+    * @throws NS_ERROR* - Method failure.
+    */
+    void lockFactory(in boolean lock);
+};
diff --git a/xpcom/components/nsIModule.idl b/xpcom/components/nsIModule.idl
new file mode 100644
index 000000000..4570a0199
--- /dev/null
+++ b/xpcom/components/nsIModule.idl
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 "nsISupports.idl"
+
+interface nsIFile;
+interface nsIComponentManager;
+
+/**
+ * The nsIModule interface.
+ */
+
+[scriptable, uuid(7392D032-5371-11d3-994E-00805FD26FEE)]
+interface nsIModule : nsISupports
+{
+    /** 
+     * Object Instance Creation
+     *
+     * Obtains a Class Object from a nsIModule for a given CID and IID pair.  
+     * This class object can either be query to a nsIFactory or a may be 
+     * query to a nsIClassInfo.
+     *
+     * @param aCompMgr  : The global component manager
+     * @param aClass    : ClassID of object instance requested
+     * @param aIID      : IID of interface requested
+     * 
+     */
+    void getClassObject(in nsIComponentManager aCompMgr, 
+                        in nsCIDRef aClass,
+                        in nsIIDRef aIID,
+                        [retval, iid_is(aIID)] out nsQIResult aResult);
+
+
+    /**
+     * One time registration callback
+     *
+     * When the nsIModule is discovered, this method will be
+     * called so that any setup registration can be preformed.
+     *
+     * @param aCompMgr  : The global component manager
+     * @param aLocation : The location of the nsIModule on disk
+     * @param aLoaderStr: Opaque loader specific string
+     * @param aType     : Loader Type being used to load this module 
+     */
+    void registerSelf(in nsIComponentManager aCompMgr, 
+                      in nsIFile aLocation,
+                      in string aLoaderStr, 
+                      in string aType);
+    /**
+     * One time unregistration callback
+     *
+     * When the nsIModule is being unregistered, this method will be
+     * called so that any unregistration can be preformed
+     *
+     * @param aCompMgr   : The global component manager
+     * @param aLocation  : The location of the nsIModule on disk
+     * @param aLoaderStr : Opaque loader specific string
+     * 
+     */
+   void unregisterSelf(in nsIComponentManager aCompMgr, 
+                        in nsIFile aLocation,
+                        in string  aLoaderStr);
+
+   /** 
+    * Module load management
+    * 
+    * @param aCompMgr  : The global component manager
+    *
+    * @return indicates to the caller if the module can be unloaded.
+    * 		Returning PR_TRUE isn't a guarantee that the module will be
+    *		unloaded. It constitues only willingness of the module to be
+    *		unloaded.  It is very important to ensure that no outstanding 
+    *       references to the module's code/data exist before returning 
+    *       PR_TRUE. 
+    *		Returning PR_FALSE guaratees that the module won't be unloaded.
+    */
+    boolean canUnload(in nsIComponentManager aCompMgr);
+};
+
+
diff --git a/xpcom/components/nsIServiceManager.idl b/xpcom/components/nsIServiceManager.idl
new file mode 100644
index 000000000..45c1c3cc2
--- /dev/null
+++ b/xpcom/components/nsIServiceManager.idl
@@ -0,0 +1,72 @@
+/* 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 "nsISupports.idl"
+
+/**
+ * The nsIServiceManager manager interface provides a means to obtain
+ * global services in an application. The service manager depends on the 
+ * repository to find and instantiate factories to obtain services.
+ *
+ * Users of the service manager must first obtain a pointer to the global
+ * service manager by calling NS_GetServiceManager. After that, 
+ * they can request specific services by calling GetService. When they are
+ * finished they can NS_RELEASE() the service as usual.
+ *
+ * A user of a service may keep references to particular services indefinitely
+ * and only must call Release when it shuts down.
+ */
+
+[scriptable, uuid(8bb35ed9-e332-462d-9155-4a002ab5c958)]
+interface nsIServiceManager : nsISupports
+{
+    /**
+     * getServiceByContractID
+     *
+     * Returns the instance that implements aClass or aContractID and the
+     * interface aIID.  This may result in the instance being created.
+     *
+     * @param aClass or aContractID : aClass or aContractID of object 
+     *                                instance requested
+     * @param aIID : IID of interface requested
+     * @param result : resulting service 
+     */
+    void getService(in nsCIDRef aClass, 
+		    in nsIIDRef aIID, 
+		    [iid_is(aIID),retval] out nsQIResult result);
+
+    void getServiceByContractID(in string aContractID,
+				in nsIIDRef aIID, 
+				[iid_is(aIID),retval] out nsQIResult result);
+
+    /**
+     * isServiceInstantiated
+     *
+     * isServiceInstantiated will return a true if the service has already
+     * been created, or throw otherwise
+     *
+     * @param aClass or aContractID : aClass or aContractID of object 
+     *                                instance requested
+     * @param aIID : IID of interface requested
+     * @throws NS_ERROR_SERVICE_NOT_AVAILABLE if the service hasn't been 
+     *         instantiated
+     * @throws NS_NOINTERFACE if the IID given isn't supported by the object
+     */
+    boolean isServiceInstantiated(in nsCIDRef aClass, in nsIIDRef aIID);
+    boolean isServiceInstantiatedByContractID(in string aContractID, in nsIIDRef aIID);
+};
+
+
+%{C++
+// Observing xpcom autoregistration.  Topics will be 'start' and 'stop'.
+#define NS_XPCOM_AUTOREGISTRATION_OBSERVER_ID "xpcom-autoregistration"
+
+#ifdef MOZILLA_INTERNAL_API
+#include "nsXPCOM.h"
+#include "nsComponentManagerUtils.h"
+#include "nsServiceManagerUtils.h"
+#endif
+%}
+
diff --git a/xpcom/components/nsNativeModuleLoader.cpp b/xpcom/components/nsNativeModuleLoader.cpp
new file mode 100644
index 000000000..6452f5d1b
--- /dev/null
+++ b/xpcom/components/nsNativeModuleLoader.cpp
@@ -0,0 +1,220 @@
+/* -*- 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/.
+ * This Original Code has been modified by IBM Corporation.
+ * Modifications made by IBM described herein are
+ * Copyright (c) International Business Machines
+ * Corporation, 2000
+ *
+ * Modifications to Mozilla code or documentation
+ * identified per MPL Section 3.3
+ *
+ * Date             Modified by     Description of modification
+ * 04/20/2000       IBM Corp.      Added PR_CALLBACK for Optlink use in OS2
+ */
+
+#include "nsNativeModuleLoader.h"
+
+#include "mozilla/Logging.h"
+#include "prinit.h"
+#include "prerror.h"
+
+#include "nsComponentManager.h"
+#include "ManifestParser.h" // for LogMessage
+#include "nsCRTGlue.h"
+#include "nsThreadUtils.h"
+#include "nsTraceRefcnt.h"
+
+#include "nsIFile.h"
+#include "mozilla/WindowsDllBlocklist.h"
+
+#ifdef XP_WIN
+#include <windows.h>
+#endif
+
+#ifdef XP_MACOSX
+#include <signal.h>
+#endif
+
+#ifdef DEBUG
+#define IMPLEMENT_BREAK_AFTER_LOAD
+#endif
+
+using namespace mozilla;
+
+static LazyLogModule sNativeModuleLoaderLog("nsNativeModuleLoader");
+#define LOG(level, args) MOZ_LOG(sNativeModuleLoaderLog, level, args)
+
+nsresult
+nsNativeModuleLoader::Init()
+{
+  MOZ_ASSERT(NS_IsMainThread(), "Startup not on main thread?");
+  LOG(LogLevel::Debug, ("nsNativeModuleLoader::Init()"));
+  return NS_OK;
+}
+
+class LoadModuleMainThreadRunnable : public Runnable
+{
+public:
+  LoadModuleMainThreadRunnable(nsNativeModuleLoader* aLoader,
+                               FileLocation& aFile)
+    : mManager(nsComponentManagerImpl::gComponentManager)
+    , mLoader(aLoader)
+    , mFile(aFile)
+    , mResult(nullptr)
+  {
+  }
+
+  NS_IMETHOD Run() override
+  {
+    mResult = mLoader->LoadModule(mFile);
+    return NS_OK;
+  }
+
+  RefPtr<nsComponentManagerImpl> mManager;
+  nsNativeModuleLoader* mLoader;
+  FileLocation mFile;
+  const mozilla::Module* mResult;
+};
+
+const mozilla::Module*
+nsNativeModuleLoader::LoadModule(FileLocation& aFile)
+{
+  if (aFile.IsZip()) {
+    NS_ERROR("Binary components cannot be loaded from JARs");
+    return nullptr;
+  }
+  nsCOMPtr<nsIFile> file = aFile.GetBaseFile();
+  nsresult rv;
+
+  if (!NS_IsMainThread()) {
+    // If this call is off the main thread, synchronously proxy it
+    // to the main thread.
+    RefPtr<LoadModuleMainThreadRunnable> r =
+      new LoadModuleMainThreadRunnable(this, aFile);
+    NS_DispatchToMainThread(r, NS_DISPATCH_SYNC);
+    return r->mResult;
+  }
+
+  nsCOMPtr<nsIHashable> hashedFile(do_QueryInterface(file));
+  if (!hashedFile) {
+    NS_ERROR("nsIFile is not nsIHashable");
+    return nullptr;
+  }
+
+  nsAutoCString filePath;
+  file->GetNativePath(filePath);
+
+  NativeLoadData data;
+
+  if (mLibraries.Get(hashedFile, &data)) {
+    NS_ASSERTION(data.mModule, "Corrupt mLibraries hash");
+    LOG(LogLevel::Debug,
+        ("nsNativeModuleLoader::LoadModule(\"%s\") - found in cache",
+         filePath.get()));
+    return data.mModule;
+  }
+
+  // We haven't loaded this module before
+  {
+#ifdef HAS_DLL_BLOCKLIST
+    AutoSetXPCOMLoadOnMainThread guard;
+#endif
+    rv = file->Load(&data.mLibrary);
+  }
+
+  if (NS_FAILED(rv)) {
+    char errorMsg[1024] = "<unknown; can't get error from NSPR>";
+
+    if (PR_GetErrorTextLength() < (int)sizeof(errorMsg)) {
+      PR_GetErrorText(errorMsg);
+    }
+
+    LogMessage("Failed to load native module at path '%s': (%lx) %s",
+               filePath.get(), rv, errorMsg);
+
+    return nullptr;
+  }
+
+#ifdef IMPLEMENT_BREAK_AFTER_LOAD
+  nsAutoCString leafName;
+  file->GetNativeLeafName(leafName);
+
+  char* env = getenv("XPCOM_BREAK_ON_LOAD");
+  char* blist;
+  if (env && *env && (blist = strdup(env))) {
+    char* nextTok = blist;
+    while (char* token = NS_strtok(":", &nextTok)) {
+      if (leafName.Find(token, true) != kNotFound) {
+        NS_BREAK();
+      }
+    }
+
+    free(blist);
+  }
+#endif
+
+  void* module = PR_FindSymbol(data.mLibrary, "NSModule");
+  if (!module) {
+    LogMessage("Native module at path '%s' doesn't export symbol `NSModule`.",
+               filePath.get());
+    PR_UnloadLibrary(data.mLibrary);
+    return nullptr;
+  }
+
+  data.mModule = *(mozilla::Module const* const*)module;
+  if (mozilla::Module::kVersion != data.mModule->mVersion) {
+    LogMessage("Native module at path '%s' is incompatible with this version of Firefox, has version %i, expected %i.",
+               filePath.get(), data.mModule->mVersion,
+               mozilla::Module::kVersion);
+    PR_UnloadLibrary(data.mLibrary);
+    return nullptr;
+  }
+
+  mLibraries.Put(hashedFile, data); // infallible
+  return data.mModule;
+}
+
+void
+nsNativeModuleLoader::UnloadLibraries()
+{
+  MOZ_ASSERT(NS_IsMainThread(), "Shutdown not on main thread?");
+
+  for (auto iter = mLibraries.Iter(); !iter.Done(); iter.Next()) {
+    NativeLoadData& loadData = iter.Data();
+    loadData.mModule = nullptr;
+  }
+
+  for (auto iter = mLibraries.Iter(); !iter.Done(); iter.Next()) {
+    if (MOZ_LOG_TEST(sNativeModuleLoaderLog, LogLevel::Debug)) {
+      nsIHashable* hashedFile = iter.Key();
+      nsCOMPtr<nsIFile> file(do_QueryInterface(hashedFile));
+
+      nsAutoCString filePath;
+      file->GetNativePath(filePath);
+
+      LOG(LogLevel::Debug,
+          ("nsNativeModuleLoader::UnloaderFunc(\"%s\")", filePath.get()));
+    }
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+    nsTraceRefcnt::SetActivityIsLegal(false);
+#endif
+
+#if 0
+    // XXXbsmedberg: do this as soon as the static-destructor crash(es)
+    // are fixed
+    NativeLoadData& loadData = iter.Data();
+    PRStatus ret = PR_UnloadLibrary(loadData.mLibrary);
+    NS_ASSERTION(ret == PR_SUCCESS, "Failed to unload library");
+#endif
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+    nsTraceRefcnt::SetActivityIsLegal(true);
+#endif
+
+    iter.Remove();
+  }
+}
diff --git a/xpcom/components/nsNativeModuleLoader.h b/xpcom/components/nsNativeModuleLoader.h
new file mode 100644
index 000000000..b05a4a7a2
--- /dev/null
+++ b/xpcom/components/nsNativeModuleLoader.h
@@ -0,0 +1,39 @@
+/* -*- 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 nsNativeModuleLoader_h__
+#define nsNativeModuleLoader_h__
+
+#include "nsDataHashtable.h"
+#include "nsHashKeys.h"
+#include "prlink.h"
+
+namespace mozilla {
+class FileLocation;
+} // namespace mozilla
+
+class nsNativeModuleLoader final
+{
+public:
+  const mozilla::Module* LoadModule(mozilla::FileLocation& aFile);
+
+  nsresult Init();
+
+  void UnloadLibraries();
+
+private:
+  struct NativeLoadData
+  {
+    NativeLoadData() : mModule(nullptr), mLibrary(nullptr) {}
+
+    const mozilla::Module* mModule;
+    PRLibrary* mLibrary;
+  };
+
+  nsDataHashtable<nsHashableHashKey, NativeLoadData> mLibraries;
+};
+
+#endif /* nsNativeModuleLoader_h__ */