Add m-esr52 at 52.6.0

1 files changed, 835 insertions, 0 deletions

diff --git a/startupcache/StartupCache.cpp b/startupcache/StartupCache.cpp
new file mode 100644
index 0000000000..371f4795c0
--- /dev/null
+++ b/startupcache/StartupCache.cpp
@@ -0,0 +1,835 @@
+/* -*- 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 "prio.h"
+#include "PLDHashTable.h"
+#include "nsXPCOMStrings.h"
+#include "mozilla/IOInterposer.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/scache/StartupCache.h"
+
+#include "nsAutoPtr.h"
+#include "nsClassHashtable.h"
+#include "nsComponentManagerUtils.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsIClassInfo.h"
+#include "nsIFile.h"
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsIOutputStream.h"
+#include "nsIStartupCache.h"
+#include "nsIStorageStream.h"
+#include "nsIStreamBufferAccess.h"
+#include "nsIStringStream.h"
+#include "nsISupports.h"
+#include "nsITimer.h"
+#include "nsIZipWriter.h"
+#include "nsIZipReader.h"
+#include "nsWeakReference.h"
+#include "nsZipArchive.h"
+#include "mozilla/Omnijar.h"
+#include "prenv.h"
+#include "mozilla/Telemetry.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "nsIProtocolHandler.h"
+
+#ifdef IS_BIG_ENDIAN
+#define SC_ENDIAN "big"
+#else
+#define SC_ENDIAN "little"
+#endif
+
+#if PR_BYTES_PER_WORD == 4
+#define SC_WORDSIZE "4"
+#else
+#define SC_WORDSIZE "8"
+#endif
+
+namespace mozilla {
+namespace scache {
+
+MOZ_DEFINE_MALLOC_SIZE_OF(StartupCacheMallocSizeOf)
+
+NS_IMETHODIMP
+StartupCache::CollectReports(nsIHandleReportCallback* aHandleReport,
+                             nsISupports* aData, bool aAnonymize)
+{
+  MOZ_COLLECT_REPORT(
+    "explicit/startup-cache/mapping", KIND_NONHEAP, UNITS_BYTES,
+    SizeOfMapping(),
+    "Memory used to hold the mapping of the startup cache from file. "
+    "This memory is likely to be swapped out shortly after start-up.");
+
+  MOZ_COLLECT_REPORT(
+    "explicit/startup-cache/data", KIND_HEAP, UNITS_BYTES,
+    HeapSizeOfIncludingThis(StartupCacheMallocSizeOf),
+    "Memory used by the startup cache for things other than the file mapping.");
+
+  return NS_OK;
+}
+
+#define STARTUP_CACHE_NAME "startupCache." SC_WORDSIZE "." SC_ENDIAN
+
+StartupCache*
+StartupCache::GetSingleton()
+{
+  if (!gStartupCache) {
+    if (!XRE_IsParentProcess()) {
+      return nullptr;
+    }
+#ifdef MOZ_DISABLE_STARTUPCACHE
+    return nullptr;
+#else
+    StartupCache::InitSingleton();
+#endif
+  }
+
+  return StartupCache::gStartupCache;
+}
+
+void
+StartupCache::DeleteSingleton()
+{
+  StartupCache::gStartupCache = nullptr;
+}
+
+nsresult
+StartupCache::InitSingleton()
+{
+  nsresult rv;
+  StartupCache::gStartupCache = new StartupCache();
+
+  rv = StartupCache::gStartupCache->Init();
+  if (NS_FAILED(rv)) {
+    StartupCache::gStartupCache = nullptr;
+  }
+  return rv;
+}
+
+StaticRefPtr<StartupCache> StartupCache::gStartupCache;
+bool StartupCache::gShutdownInitiated;
+bool StartupCache::gIgnoreDiskCache;
+enum StartupCache::TelemetrifyAge StartupCache::gPostFlushAgeAction = StartupCache::IGNORE_AGE;
+
+NS_IMPL_ISUPPORTS(StartupCache, nsIMemoryReporter)
+
+StartupCache::StartupCache()
+  : mArchive(nullptr), mStartupWriteInitiated(false), mWriteThread(nullptr)
+{ }
+
+StartupCache::~StartupCache()
+{
+  if (mTimer) {
+    mTimer->Cancel();
+  }
+
+  // Generally, the in-memory table should be empty here,
+  // but an early shutdown means either mTimer didn't run
+  // or the write thread is still running.
+  WaitOnWriteThread();
+
+  // If we shutdown quickly timer wont have fired. Instead of writing
+  // it on the main thread and block the shutdown we simply wont update
+  // the startup cache. Always do this if the file doesn't exist since
+  // we use it part of the package step.
+  if (!mArchive) {
+    WriteToDisk();
+  }
+
+  UnregisterWeakMemoryReporter(this);
+}
+
+nsresult
+StartupCache::Init()
+{
+  // workaround for bug 653936
+  nsCOMPtr<nsIProtocolHandler> jarInitializer(do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "jar"));
+
+  nsresult rv;
+
+  // This allows to override the startup cache filename
+  // which is useful from xpcshell, when there is no ProfLDS directory to keep cache in.
+  char *env = PR_GetEnv("MOZ_STARTUP_CACHE");
+  if (env) {
+    rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(env), false, getter_AddRefs(mFile));
+  } else {
+    nsCOMPtr<nsIFile> file;
+    rv = NS_GetSpecialDirectory("ProfLDS",
+                                getter_AddRefs(file));
+    if (NS_FAILED(rv)) {
+      // return silently, this will fail in mochitests's xpcshell process.
+      return rv;
+    }
+
+    nsCOMPtr<nsIFile> profDir;
+    NS_GetSpecialDirectory("ProfDS", getter_AddRefs(profDir));
+    if (profDir) {
+      bool same;
+      if (NS_SUCCEEDED(profDir->Equals(file, &same)) && !same) {
+        // We no longer store the startup cache in the main profile
+        // directory, so we should cleanup the old one.
+        if (NS_SUCCEEDED(
+              profDir->AppendNative(NS_LITERAL_CSTRING("startupCache")))) {
+          profDir->Remove(true);
+        }
+      }
+    }
+
+    rv = file->AppendNative(NS_LITERAL_CSTRING("startupCache"));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // Try to create the directory if it's not there yet
+    rv = file->Create(nsIFile::DIRECTORY_TYPE, 0777);
+    if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS)
+      return rv;
+
+    rv = file->AppendNative(NS_LITERAL_CSTRING(STARTUP_CACHE_NAME));
+
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mFile = do_QueryInterface(file);
+  }
+
+  NS_ENSURE_TRUE(mFile, NS_ERROR_UNEXPECTED);
+
+  mObserverService = do_GetService("@mozilla.org/observer-service;1");
+
+  if (!mObserverService) {
+    NS_WARNING("Could not get observerService.");
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  mListener = new StartupCacheListener();
+  rv = mObserverService->AddObserver(mListener, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
+                                     false);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = mObserverService->AddObserver(mListener, "startupcache-invalidate",
+                                     false);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = LoadArchive(RECORD_AGE);
+
+  // Sometimes we don't have a cache yet, that's ok.
+  // If it's corrupted, just remove it and start over.
+  if (gIgnoreDiskCache || (NS_FAILED(rv) && rv != NS_ERROR_FILE_NOT_FOUND)) {
+    NS_WARNING("Failed to load startupcache file correctly, removing!");
+    InvalidateCache();
+  }
+
+  RegisterWeakMemoryReporter(this);
+
+  return NS_OK;
+}
+
+/**
+ * LoadArchive can be called from the main thread or while reloading cache on write thread.
+ */
+nsresult
+StartupCache::LoadArchive(enum TelemetrifyAge flag)
+{
+  if (gIgnoreDiskCache)
+    return NS_ERROR_FAILURE;
+
+  bool exists;
+  mArchive = nullptr;
+  nsresult rv = mFile->Exists(&exists);
+  if (NS_FAILED(rv) || !exists)
+    return NS_ERROR_FILE_NOT_FOUND;
+  
+  mArchive = new nsZipArchive();
+  rv = mArchive->OpenArchive(mFile);
+  if (NS_FAILED(rv) || flag == IGNORE_AGE)
+    return rv;
+
+  nsCString comment;
+  if (!mArchive->GetComment(comment)) {
+    return rv;
+  }
+
+  const char *data;
+  size_t len = NS_CStringGetData(comment, &data);
+  PRTime creationStamp;
+  // We might not have a comment if the startup cache file was created
+  // before we started recording creation times in the comment.
+  if (len == sizeof(creationStamp)) {
+    memcpy(&creationStamp, data, len);
+    PRTime current = PR_Now();
+    int64_t diff = current - creationStamp;
+
+    // We can't use AccumulateTimeDelta here because we have no way of
+    // reifying a TimeStamp from creationStamp.
+    int64_t usec_per_hour = PR_USEC_PER_SEC * int64_t(3600);
+    int64_t hour_diff = (diff + usec_per_hour - 1) / usec_per_hour;
+    mozilla::Telemetry::Accumulate(Telemetry::STARTUP_CACHE_AGE_HOURS,
+                                   hour_diff);
+  }
+
+  return rv;
+}
+
+namespace {
+
+nsresult
+GetBufferFromZipArchive(nsZipArchive *zip, bool doCRC, const char* id,
+                        UniquePtr<char[]>* outbuf, uint32_t* length)
+{
+  if (!zip)
+    return NS_ERROR_NOT_AVAILABLE;
+
+  nsZipItemPtr<char> zipItem(zip, id, doCRC);
+  if (!zipItem)
+    return NS_ERROR_NOT_AVAILABLE;
+
+  *outbuf = zipItem.Forget();
+  *length = zipItem.Length();
+  return NS_OK;
+}
+
+} /* anonymous namespace */
+
+// NOTE: this will not find a new entry until it has been written to disk!
+// Consumer should take ownership of the resulting buffer.
+nsresult
+StartupCache::GetBuffer(const char* id, UniquePtr<char[]>* outbuf, uint32_t* length) 
+{
+  PROFILER_LABEL_FUNC(js::ProfileEntry::Category::OTHER);
+
+  NS_ASSERTION(NS_IsMainThread(), "Startup cache only available on main thread");
+
+  WaitOnWriteThread();
+  if (!mStartupWriteInitiated) {
+    CacheEntry* entry; 
+    nsDependentCString idStr(id);
+    mTable.Get(idStr, &entry);
+    if (entry) {
+      *outbuf = MakeUnique<char[]>(entry->size);
+      memcpy(outbuf->get(), entry->data.get(), entry->size);
+      *length = entry->size;
+      return NS_OK;
+    }
+  }
+
+  nsresult rv = GetBufferFromZipArchive(mArchive, true, id, outbuf, length);
+  if (NS_SUCCEEDED(rv))
+    return rv;
+
+  RefPtr<nsZipArchive> omnijar = mozilla::Omnijar::GetReader(mozilla::Omnijar::APP);
+  // no need to checksum omnijarred entries
+  rv = GetBufferFromZipArchive(omnijar, false, id, outbuf, length);
+  if (NS_SUCCEEDED(rv))
+    return rv;
+
+  omnijar = mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE);
+  // no need to checksum omnijarred entries
+  return GetBufferFromZipArchive(omnijar, false, id, outbuf, length);
+}
+
+// Makes a copy of the buffer, client retains ownership of inbuf.
+nsresult
+StartupCache::PutBuffer(const char* id, const char* inbuf, uint32_t len) 
+{
+  NS_ASSERTION(NS_IsMainThread(), "Startup cache only available on main thread");
+  WaitOnWriteThread();
+  if (StartupCache::gShutdownInitiated) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  auto data = MakeUnique<char[]>(len);
+  memcpy(data.get(), inbuf, len);
+
+  nsCString idStr(id);
+  // Cache it for now, we'll write all together later.
+  CacheEntry* entry; 
+  
+  if (mTable.Get(idStr)) {
+    NS_WARNING("Existing entry in StartupCache.");
+    // Double-caching is undesirable but not an error.
+    return NS_OK;
+  }
+
+#ifdef DEBUG
+  if (mArchive) {
+    nsZipItem* zipItem = mArchive->GetItem(id);
+    NS_ASSERTION(zipItem == nullptr, "Existing entry in disk StartupCache.");
+  }
+#endif
+
+  entry = new CacheEntry(Move(data), len);
+  mTable.Put(idStr, entry);
+  mPendingWrites.AppendElement(idStr);
+  return ResetStartupWriteTimer();
+}
+
+size_t
+StartupCache::SizeOfMapping()
+{
+    return mArchive ? mArchive->SizeOfMapping() : 0;
+}
+
+size_t
+StartupCache::HeapSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
+{
+    // This function could measure more members, but they haven't been found by
+    // DMD to be significant.  They can be added later if necessary.
+
+    size_t n = aMallocSizeOf(this);
+
+    n += mTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
+    for (auto iter = mTable.ConstIter(); !iter.Done(); iter.Next()) {
+        n += iter.Data()->SizeOfIncludingThis(aMallocSizeOf);
+    }
+
+    n += mPendingWrites.ShallowSizeOfExcludingThis(aMallocSizeOf);
+
+    return n;
+}
+
+struct CacheWriteHolder
+{
+  nsCOMPtr<nsIZipWriter> writer;
+  nsCOMPtr<nsIStringInputStream> stream;
+  PRTime time;
+};
+
+static void
+CacheCloseHelper(const nsACString& key, const CacheEntry* data,
+                 const CacheWriteHolder* holder)
+{
+  MOZ_ASSERT(data); // assert key was found in mTable.
+
+  nsresult rv;
+  nsIStringInputStream* stream = holder->stream;
+  nsIZipWriter* writer = holder->writer;
+
+  stream->ShareData(data->data.get(), data->size);
+
+#ifdef DEBUG
+  bool hasEntry;
+  rv = writer->HasEntry(key, &hasEntry);
+  NS_ASSERTION(NS_SUCCEEDED(rv) && hasEntry == false, 
+               "Existing entry in disk StartupCache.");
+#endif
+  rv = writer->AddEntryStream(key, holder->time, true, stream, false);
+
+  if (NS_FAILED(rv)) {
+    NS_WARNING("cache entry deleted but not written to disk.");
+  }
+}
+
+
+/** 
+ * WriteToDisk writes the cache out to disk. Callers of WriteToDisk need to call WaitOnWriteThread
+ * to make sure there isn't a write happening on another thread
+ */
+void
+StartupCache::WriteToDisk() 
+{
+  nsresult rv;
+  mStartupWriteInitiated = true;
+
+  if (mTable.Count() == 0)
+    return;
+
+  nsCOMPtr<nsIZipWriter> zipW = do_CreateInstance("@mozilla.org/zipwriter;1");
+  if (!zipW)
+    return;
+
+  rv = zipW->Open(mFile, PR_RDWR | PR_CREATE_FILE);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("could not open zipfile for write");
+    return;
+  } 
+
+  // If we didn't have an mArchive member, that means that we failed to
+  // open the startup cache for reading.  Therefore, we need to record
+  // the time of creation in a zipfile comment; this will be useful for
+  // Telemetry statistics.
+  PRTime now = PR_Now();
+  if (!mArchive) {
+    nsCString comment;
+    comment.Assign((char *)&now, sizeof(now));
+    zipW->SetComment(comment);
+  }
+
+  nsCOMPtr<nsIStringInputStream> stream 
+    = do_CreateInstance("@mozilla.org/io/string-input-stream;1", &rv);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("Couldn't create string input stream.");
+    return;
+  }
+
+  CacheWriteHolder holder;
+  holder.stream = stream;
+  holder.writer = zipW;
+  holder.time = now;
+
+  for (auto key = mPendingWrites.begin(); key != mPendingWrites.end(); key++) {
+    CacheCloseHelper(*key, mTable.Get(*key), &holder);
+  }
+  mPendingWrites.Clear();
+  mTable.Clear();
+
+  // Close the archive so Windows doesn't choke.
+  mArchive = nullptr;
+  zipW->Close();
+
+  // We succesfully wrote the archive to disk; mark the disk file as trusted
+  gIgnoreDiskCache = false;
+
+  // Our reader's view of the archive is outdated now, reload it.
+  LoadArchive(gPostFlushAgeAction);
+  
+  return;
+}
+
+void
+StartupCache::InvalidateCache() 
+{
+  WaitOnWriteThread();
+  mPendingWrites.Clear();
+  mTable.Clear();
+  mArchive = nullptr;
+  nsresult rv = mFile->Remove(false);
+  if (NS_FAILED(rv) && rv != NS_ERROR_FILE_TARGET_DOES_NOT_EXIST &&
+      rv != NS_ERROR_FILE_NOT_FOUND) {
+    gIgnoreDiskCache = true;
+    mozilla::Telemetry::Accumulate(Telemetry::STARTUP_CACHE_INVALID, true);
+    return;
+  }
+  gIgnoreDiskCache = false;
+  LoadArchive(gPostFlushAgeAction);
+}
+
+void
+StartupCache::IgnoreDiskCache()
+{
+  gIgnoreDiskCache = true;
+  if (gStartupCache)
+    gStartupCache->InvalidateCache();
+}
+
+/*
+ * WaitOnWriteThread() is called from a main thread to wait for the worker
+ * thread to finish. However since the same code is used in the worker thread and
+ * main thread, the worker thread can also call WaitOnWriteThread() which is a no-op.
+ */
+void
+StartupCache::WaitOnWriteThread()
+{
+  NS_ASSERTION(NS_IsMainThread(), "Startup cache should only wait for io thread on main thread");
+  if (!mWriteThread || mWriteThread == PR_GetCurrentThread())
+    return;
+
+  PR_JoinThread(mWriteThread);
+  mWriteThread = nullptr;
+}
+
+void
+StartupCache::ThreadedWrite(void *aClosure)
+{
+  PR_SetCurrentThreadName("StartupCache");
+  mozilla::IOInterposer::RegisterCurrentThread();
+  /*
+   * It is safe to use the pointer passed in aClosure to reference the
+   * StartupCache object because the thread's lifetime is tightly coupled to
+   * the lifetime of the StartupCache object; this thread is joined in the
+   * StartupCache destructor, guaranteeing that this function runs if and only
+   * if the StartupCache object is valid.
+   */
+  StartupCache* startupCacheObj = static_cast<StartupCache*>(aClosure);
+  startupCacheObj->WriteToDisk();
+  mozilla::IOInterposer::UnregisterCurrentThread();
+}
+
+/*
+ * The write-thread is spawned on a timeout(which is reset with every write). This
+ * can avoid a slow shutdown. After writing out the cache, the zipreader is
+ * reloaded on the worker thread.
+ */
+void
+StartupCache::WriteTimeout(nsITimer *aTimer, void *aClosure)
+{
+  /*
+   * It is safe to use the pointer passed in aClosure to reference the
+   * StartupCache object because the timer's lifetime is tightly coupled to
+   * the lifetime of the StartupCache object; this timer is canceled in the
+   * StartupCache destructor, guaranteeing that this function runs if and only
+   * if the StartupCache object is valid.
+   */
+  StartupCache* startupCacheObj = static_cast<StartupCache*>(aClosure);
+  startupCacheObj->mWriteThread = PR_CreateThread(PR_USER_THREAD,
+                                                  StartupCache::ThreadedWrite,
+                                                  startupCacheObj,
+                                                  PR_PRIORITY_NORMAL,
+                                                  PR_GLOBAL_THREAD,
+                                                  PR_JOINABLE_THREAD,
+                                                  0);
+}
+
+// We don't want to refcount StartupCache, so we'll just
+// hold a ref to this and pass it to observerService instead.
+NS_IMPL_ISUPPORTS(StartupCacheListener, nsIObserver)
+
+nsresult
+StartupCacheListener::Observe(nsISupports *subject, const char* topic, const char16_t* data)
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc)
+    return NS_OK;
+
+  if (strcmp(topic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
+    // Do not leave the thread running past xpcom shutdown
+    sc->WaitOnWriteThread();
+    StartupCache::gShutdownInitiated = true;
+  } else if (strcmp(topic, "startupcache-invalidate") == 0) {
+    sc->InvalidateCache();
+  }
+  return NS_OK;
+} 
+
+nsresult
+StartupCache::GetDebugObjectOutputStream(nsIObjectOutputStream* aStream,
+                                         nsIObjectOutputStream** aOutStream) 
+{
+  NS_ENSURE_ARG_POINTER(aStream);
+#ifdef DEBUG
+  StartupCacheDebugOutputStream* stream
+    = new StartupCacheDebugOutputStream(aStream, &mWriteObjectMap);
+  NS_ADDREF(*aOutStream = stream);
+#else
+  NS_ADDREF(*aOutStream = aStream);
+#endif
+  
+  return NS_OK;
+}
+
+nsresult
+StartupCache::ResetStartupWriteTimer()
+{
+  mStartupWriteInitiated = false;
+  nsresult rv;
+  if (!mTimer)
+    mTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
+  else
+    rv = mTimer->Cancel();
+  NS_ENSURE_SUCCESS(rv, rv);
+  // Wait for 10 seconds, then write out the cache.
+  mTimer->InitWithFuncCallback(StartupCache::WriteTimeout, this, 60000,
+                               nsITimer::TYPE_ONE_SHOT);
+  return NS_OK;
+}
+
+nsresult
+StartupCache::RecordAgesAlways()
+{
+  gPostFlushAgeAction = RECORD_AGE;
+  return NS_OK;
+}
+
+// StartupCacheDebugOutputStream implementation
+#ifdef DEBUG
+NS_IMPL_ISUPPORTS(StartupCacheDebugOutputStream, nsIObjectOutputStream, 
+                  nsIBinaryOutputStream, nsIOutputStream)
+
+bool
+StartupCacheDebugOutputStream::CheckReferences(nsISupports* aObject)
+{
+  nsresult rv;
+  
+  nsCOMPtr<nsIClassInfo> classInfo = do_QueryInterface(aObject);
+  if (!classInfo) {
+    NS_ERROR("aObject must implement nsIClassInfo");
+    return false;
+  }
+  
+  uint32_t flags;
+  rv = classInfo->GetFlags(&flags);
+  NS_ENSURE_SUCCESS(rv, false);
+  if (flags & nsIClassInfo::SINGLETON)
+    return true;
+  
+  nsISupportsHashKey* key = mObjectMap->GetEntry(aObject);
+  if (key) {
+    NS_ERROR("non-singleton aObject is referenced multiple times in this" 
+                  "serialization, we don't support that.");
+    return false;
+  }
+
+  mObjectMap->PutEntry(aObject);
+  return true;
+}
+
+// nsIObjectOutputStream implementation
+nsresult
+StartupCacheDebugOutputStream::WriteObject(nsISupports* aObject, bool aIsStrongRef)
+{
+  nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
+  
+  NS_ASSERTION(rootObject.get() == aObject,
+               "bad call to WriteObject -- call WriteCompoundObject!");
+  bool check = CheckReferences(aObject);
+  NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
+  return mBinaryStream->WriteObject(aObject, aIsStrongRef);
+}
+
+nsresult
+StartupCacheDebugOutputStream::WriteSingleRefObject(nsISupports* aObject)
+{
+  nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
+  
+  NS_ASSERTION(rootObject.get() == aObject,
+               "bad call to WriteSingleRefObject -- call WriteCompoundObject!");
+  bool check = CheckReferences(aObject);
+  NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
+  return mBinaryStream->WriteSingleRefObject(aObject);
+}
+
+nsresult
+StartupCacheDebugOutputStream::WriteCompoundObject(nsISupports* aObject,
+                                                const nsIID& aIID,
+                                                bool aIsStrongRef)
+{
+  nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
+  
+  nsCOMPtr<nsISupports> roundtrip;
+  rootObject->QueryInterface(aIID, getter_AddRefs(roundtrip));
+  NS_ASSERTION(roundtrip.get() == aObject,
+               "bad aggregation or multiple inheritance detected by call to "
+               "WriteCompoundObject!");
+
+  bool check = CheckReferences(aObject);
+  NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
+  return mBinaryStream->WriteCompoundObject(aObject, aIID, aIsStrongRef);
+}
+
+nsresult
+StartupCacheDebugOutputStream::WriteID(nsID const& aID) 
+{
+  return mBinaryStream->WriteID(aID);
+}
+
+char*
+StartupCacheDebugOutputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask)
+{
+  return mBinaryStream->GetBuffer(aLength, aAlignMask);
+}
+
+void
+StartupCacheDebugOutputStream::PutBuffer(char* aBuffer, uint32_t aLength)
+{
+  mBinaryStream->PutBuffer(aBuffer, aLength);
+}
+#endif //DEBUG
+
+StartupCacheWrapper* StartupCacheWrapper::gStartupCacheWrapper = nullptr;
+
+NS_IMPL_ISUPPORTS(StartupCacheWrapper, nsIStartupCache)
+
+StartupCacheWrapper::~StartupCacheWrapper()
+{
+  MOZ_ASSERT(gStartupCacheWrapper == this);
+  gStartupCacheWrapper = nullptr;
+}
+
+StartupCacheWrapper* StartupCacheWrapper::GetSingleton() 
+{
+  if (!gStartupCacheWrapper)
+    gStartupCacheWrapper = new StartupCacheWrapper();
+
+  NS_ADDREF(gStartupCacheWrapper);
+  return gStartupCacheWrapper;
+}
+
+nsresult 
+StartupCacheWrapper::GetBuffer(const char* id, char** outbuf, uint32_t* length) 
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  UniquePtr<char[]> buf;
+  nsresult rv = sc->GetBuffer(id, &buf, length);
+  *outbuf = buf.release();
+  return rv;
+}
+
+nsresult
+StartupCacheWrapper::PutBuffer(const char* id, const char* inbuf, uint32_t length) 
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  return sc->PutBuffer(id, inbuf, length);
+}
+
+nsresult
+StartupCacheWrapper::InvalidateCache() 
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  sc->InvalidateCache();
+  return NS_OK;
+}
+
+nsresult
+StartupCacheWrapper::IgnoreDiskCache()
+{
+  StartupCache::IgnoreDiskCache();
+  return NS_OK;
+}
+
+nsresult 
+StartupCacheWrapper::GetDebugObjectOutputStream(nsIObjectOutputStream* stream,
+                                                nsIObjectOutputStream** outStream) 
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  return sc->GetDebugObjectOutputStream(stream, outStream);
+}
+
+nsresult
+StartupCacheWrapper::StartupWriteComplete(bool *complete)
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  sc->WaitOnWriteThread();
+  *complete = sc->mStartupWriteInitiated && sc->mTable.Count() == 0;
+  return NS_OK;
+}
+
+nsresult
+StartupCacheWrapper::ResetStartupWriteTimer()
+{
+  StartupCache* sc = StartupCache::GetSingleton();
+  return sc ? sc->ResetStartupWriteTimer() : NS_ERROR_NOT_INITIALIZED;
+}
+
+nsresult
+StartupCacheWrapper::GetObserver(nsIObserver** obv) {
+  StartupCache* sc = StartupCache::GetSingleton();
+  if (!sc) {
+    return NS_ERROR_NOT_INITIALIZED;
+  }
+  NS_ADDREF(*obv = sc->mListener);
+  return NS_OK;
+}
+
+nsresult
+StartupCacheWrapper::RecordAgesAlways() {
+  StartupCache *sc = StartupCache::GetSingleton();
+  return sc ? sc->RecordAgesAlways() : NS_ERROR_NOT_INITIALIZED;
+}
+
+} // namespace scache
+} // namespace mozilla