startupcache/StartupCache.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "prio.h"
   8 #include "pldhash.h"
   9 #include "nsXPCOMStrings.h"
  10 #include "mozilla/IOInterposer.h"
  11 #include "mozilla/MemoryReporting.h"
  12 #include "mozilla/scache/StartupCache.h"
  13
  14 #include "nsAutoPtr.h"
  15 #include "nsClassHashtable.h"
  16 #include "nsComponentManagerUtils.h"
  17 #include "nsDirectoryServiceUtils.h"
  18 #include "nsIClassInfo.h"
  19 #include "nsIFile.h"
  20 #include "nsIObserver.h"
  21 #include "nsIObserverService.h"
  22 #include "nsIOutputStream.h"
  23 #include "nsIStartupCache.h"
  24 #include "nsIStorageStream.h"
  25 #include "nsIStreamBufferAccess.h"
  26 #include "nsIStringStream.h"
  27 #include "nsISupports.h"
  28 #include "nsITimer.h"
  29 #include "nsIZipWriter.h"
  30 #include "nsIZipReader.h"
  31 #include "nsWeakReference.h"
  32 #include "nsZipArchive.h"
  33 #include "mozilla/Omnijar.h"
  34 #include "prenv.h"
  35 #include "mozilla/Telemetry.h"
  36 #include "nsThreadUtils.h"
  37 #include "nsXULAppAPI.h"
  38 #include "nsIProtocolHandler.h"
  39
  40 #ifdef IS_BIG_ENDIAN
  41 #define SC_ENDIAN "big"
  42 #else
  43 #define SC_ENDIAN "little"
  44 #endif
  45
  46 #if PR_BYTES_PER_WORD == 4
  47 #define SC_WORDSIZE "4"
  48 #else
  49 #define SC_WORDSIZE "8"
  50 #endif
  51
  52 namespace mozilla {
  53 namespace scache {
  54
  55 MOZ_DEFINE_MALLOC_SIZE_OF(StartupCacheMallocSizeOf)
  56
  57 NS_IMETHODIMP
  58 StartupCache::CollectReports(nsIHandleReportCallback* aHandleReport,
  59                              nsISupports* aData, bool aAnonymize)
  60 {
  61 #define REPORT(_path, _kind, _amount, _desc)                                \
  62   do {                                                                      \
  63     nsresult rv =                                                           \
  64       aHandleReport->Callback(EmptyCString(),                               \
  65                               NS_LITERAL_CSTRING(_path),                    \
  66                               _kind, UNITS_BYTES, _amount,                  \
  67                               NS_LITERAL_CSTRING(_desc), aData);            \
  68     NS_ENSURE_SUCCESS(rv, rv);                                              \
  69   } while (0)
  70
  71   REPORT("explicit/startup-cache/mapping", KIND_NONHEAP,
  72          SizeOfMapping(),
  73          "Memory used to hold the mapping of the startup cache from file. "
  74          "This memory is likely to be swapped out shortly after start-up.");
  75
  76   REPORT("explicit/startup-cache/data", KIND_HEAP,
  77          HeapSizeOfIncludingThis(StartupCacheMallocSizeOf),
  78          "Memory used by the startup cache for things other than the file "
  79          "mapping.");
  80
  81   return NS_OK;
  82 }
  83
  84 static const char sStartupCacheName[] = "startupCache." SC_WORDSIZE "." SC_ENDIAN;
  85 #if defined(XP_WIN) && defined(MOZ_METRO)
  86 static const char sMetroStartupCacheName[] = "metroStartupCache." SC_WORDSIZE "." SC_ENDIAN;
  87 #endif
  88
  89 StartupCache*
  90 StartupCache::GetSingleton()
  91 {
  92   if (!gStartupCache) {
  93     if (XRE_GetProcessType() != GeckoProcessType_Default) {
  94       return nullptr;
  95     }
  96 #ifdef MOZ_DISABLE_STARTUP_CACHE
  97     return nullptr;
  98 #endif
  99
 100     StartupCache::InitSingleton();
 101   }
 102
 103   return StartupCache::gStartupCache;
 104 }
 105
 106 void
 107 StartupCache::DeleteSingleton()
 108 {
 109   StartupCache::gStartupCache = nullptr;
 110 }
 111
 112 nsresult
 113 StartupCache::InitSingleton()
 114 {
 115   nsresult rv;
 116   StartupCache::gStartupCache = new StartupCache();
 117
 118   rv = StartupCache::gStartupCache->Init();
 119   if (NS_FAILED(rv)) {
 120     StartupCache::gStartupCache = nullptr;
 121   }
 122   return rv;
 123 }
 124
 125 StaticRefPtr<StartupCache> StartupCache::gStartupCache;
 126 bool StartupCache::gShutdownInitiated;
 127 bool StartupCache::gIgnoreDiskCache;
 128 enum StartupCache::TelemetrifyAge StartupCache::gPostFlushAgeAction = StartupCache::IGNORE_AGE;
 129
 130 NS_IMPL_ISUPPORTS(StartupCache, nsIMemoryReporter)
 131
 132 StartupCache::StartupCache()
 133   : mArchive(nullptr), mStartupWriteInitiated(false), mWriteThread(nullptr)
 134 { }
 135
 136 StartupCache::~StartupCache()
 137 {
 138   if (mTimer) {
 139     mTimer->Cancel();
 140   }
 141
 142   // Generally, the in-memory table should be empty here,
 143   // but an early shutdown means either mTimer didn't run
 144   // or the write thread is still running.
 145   WaitOnWriteThread();
 146
 147   // If we shutdown quickly timer wont have fired. Instead of writing
 148   // it on the main thread and block the shutdown we simply wont update
 149   // the startup cache. Always do this if the file doesn't exist since
 150   // we use it part of the package step.
 151   if (!mArchive) {
 152     WriteToDisk();
 153   }
 154
 155   UnregisterWeakMemoryReporter(this);
 156 }
 157
 158 nsresult
 159 StartupCache::Init()
 160 {
 161   // workaround for bug 653936
 162   nsCOMPtr<nsIProtocolHandler> jarInitializer(do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "jar"));
 163
 164   nsresult rv;
 165
 166   // This allows to override the startup cache filename
 167   // which is useful from xpcshell, when there is no ProfLDS directory to keep cache in.
 168   char *env = PR_GetEnv("MOZ_STARTUP_CACHE");
 169   if (env) {
 170     rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(env), false, getter_AddRefs(mFile));
 171   } else {
 172     nsCOMPtr<nsIFile> file;
 173     rv = NS_GetSpecialDirectory("ProfLDS",
 174                                 getter_AddRefs(file));
 175     if (NS_FAILED(rv)) {
 176       // return silently, this will fail in mochitests's xpcshell process.
 177       return rv;
 178     }
 179
 180     nsCOMPtr<nsIFile> profDir;
 181     NS_GetSpecialDirectory("ProfDS", getter_AddRefs(profDir));
 182     if (profDir) {
 183       bool same;
 184       if (NS_SUCCEEDED(profDir->Equals(file, &same)) && !same) {
 185         // We no longer store the startup cache in the main profile
 186         // directory, so we should cleanup the old one.
 187         if (NS_SUCCEEDED(
 188               profDir->AppendNative(NS_LITERAL_CSTRING("startupCache")))) {
 189           profDir->Remove(true);
 190         }
 191       }
 192     }
 193
 194     rv = file->AppendNative(NS_LITERAL_CSTRING("startupCache"));
 195     NS_ENSURE_SUCCESS(rv, rv);
 196
 197     // Try to create the directory if it's not there yet
 198     rv = file->Create(nsIFile::DIRECTORY_TYPE, 0777);
 199     if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS)
 200       return rv;
 201
 202 #if defined(XP_WIN) && defined(MOZ_METRO)
 203     if (XRE_GetWindowsEnvironment() == WindowsEnvironmentType_Metro) {
 204       rv = file->AppendNative(NS_LITERAL_CSTRING(sMetroStartupCacheName));
 205     } else
 206 #endif
 207     {
 208       rv = file->AppendNative(NS_LITERAL_CSTRING(sStartupCacheName));
 209     }
 210
 211     NS_ENSURE_SUCCESS(rv, rv);
 212
 213     mFile = do_QueryInterface(file);
 214   }
 215
 216   NS_ENSURE_TRUE(mFile, NS_ERROR_UNEXPECTED);
 217
 218   mObserverService = do_GetService("@mozilla.org/observer-service;1");
 219
 220   if (!mObserverService) {
 221     NS_WARNING("Could not get observerService.");
 222     return NS_ERROR_UNEXPECTED;
 223   }
 224
 225   mListener = new StartupCacheListener();
 226   rv = mObserverService->AddObserver(mListener, NS_XPCOM_SHUTDOWN_OBSERVER_ID,
 227                                      false);
 228   NS_ENSURE_SUCCESS(rv, rv);
 229   rv = mObserverService->AddObserver(mListener, "startupcache-invalidate",
 230                                      false);
 231   NS_ENSURE_SUCCESS(rv, rv);
 232
 233   rv = LoadArchive(RECORD_AGE);
 234
 235   // Sometimes we don't have a cache yet, that's ok.
 236   // If it's corrupted, just remove it and start over.
 237   if (gIgnoreDiskCache || (NS_FAILED(rv) && rv != NS_ERROR_FILE_NOT_FOUND)) {
 238     NS_WARNING("Failed to load startupcache file correctly, removing!");
 239     InvalidateCache();
 240   }
 241
 242   RegisterWeakMemoryReporter(this);
 243
 244   return NS_OK;
 245 }
 246
 247 /**
 248  * LoadArchive can be called from the main thread or while reloading cache on write thread.
 249  */
 250 nsresult
 251 StartupCache::LoadArchive(enum TelemetrifyAge flag)
 252 {
 253   if (gIgnoreDiskCache)
 254     return NS_ERROR_FAILURE;
 255
 256   bool exists;
 257   mArchive = nullptr;
 258   nsresult rv = mFile->Exists(&exists);
 259   if (NS_FAILED(rv) || !exists)
 260     return NS_ERROR_FILE_NOT_FOUND;
 261
 262   mArchive = new nsZipArchive();
 263   rv = mArchive->OpenArchive(mFile);
 264   if (NS_FAILED(rv) || flag == IGNORE_AGE)
 265     return rv;
 266
 267   nsCString comment;
 268   if (!mArchive->GetComment(comment)) {
 269     return rv;
 270   }
 271
 272   const char *data;
 273   size_t len = NS_CStringGetData(comment, &data);
 274   PRTime creationStamp;
 275   // We might not have a comment if the startup cache file was created
 276   // before we started recording creation times in the comment.
 277   if (len == sizeof(creationStamp)) {
 278     memcpy(&creationStamp, data, len);
 279     PRTime current = PR_Now();
 280     int64_t diff = current - creationStamp;
 281
 282     // We can't use AccumulateTimeDelta here because we have no way of
 283     // reifying a TimeStamp from creationStamp.
 284     int64_t usec_per_hour = PR_USEC_PER_SEC * int64_t(3600);
 285     int64_t hour_diff = (diff + usec_per_hour - 1) / usec_per_hour;
 286     mozilla::Telemetry::Accumulate(Telemetry::STARTUP_CACHE_AGE_HOURS,
 287                                    hour_diff);
 288   }
 289
 290   return rv;
 291 }
 292
 293 namespace {
 294
 295 nsresult
 296 GetBufferFromZipArchive(nsZipArchive *zip, bool doCRC, const char* id,
 297                         char** outbuf, uint32_t* length)
 298 {
 299   if (!zip)
 300     return NS_ERROR_NOT_AVAILABLE;
 301
 302   nsZipItemPtr<char> zipItem(zip, id, doCRC);
 303   if (!zipItem)
 304     return NS_ERROR_NOT_AVAILABLE;
 305
 306   *outbuf = zipItem.Forget();
 307   *length = zipItem.Length();
 308   return NS_OK;
 309 }
 310
 311 } /* anonymous namespace */
 312
 313 // NOTE: this will not find a new entry until it has been written to disk!
 314 // Consumer should take ownership of the resulting buffer.
 315 nsresult
 316 StartupCache::GetBuffer(const char* id, char** outbuf, uint32_t* length)
 317 {
 318   NS_ASSERTION(NS_IsMainThread(), "Startup cache only available on main thread");
 319   WaitOnWriteThread();
 320   if (!mStartupWriteInitiated) {
 321     CacheEntry* entry;
 322     nsDependentCString idStr(id);
 323     mTable.Get(idStr, &entry);
 324     if (entry) {
 325       *outbuf = new char[entry->size];
 326       memcpy(*outbuf, entry->data, entry->size);
 327       *length = entry->size;
 328       return NS_OK;
 329     }
 330   }
 331
 332   nsresult rv = GetBufferFromZipArchive(mArchive, true, id, outbuf, length);
 333   if (NS_SUCCEEDED(rv))
 334     return rv;
 335
 336   nsRefPtr<nsZipArchive> omnijar = mozilla::Omnijar::GetReader(mozilla::Omnijar::APP);
 337   // no need to checksum omnijarred entries
 338   rv = GetBufferFromZipArchive(omnijar, false, id, outbuf, length);
 339   if (NS_SUCCEEDED(rv))
 340     return rv;
 341
 342   omnijar = mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE);
 343   // no need to checksum omnijarred entries
 344   return GetBufferFromZipArchive(omnijar, false, id, outbuf, length);
 345 }
 346
 347 // Makes a copy of the buffer, client retains ownership of inbuf.
 348 nsresult
 349 StartupCache::PutBuffer(const char* id, const char* inbuf, uint32_t len)
 350 {
 351   NS_ASSERTION(NS_IsMainThread(), "Startup cache only available on main thread");
 352   WaitOnWriteThread();
 353   if (StartupCache::gShutdownInitiated) {
 354     return NS_ERROR_NOT_AVAILABLE;
 355   }
 356
 357   nsAutoArrayPtr<char> data(new char[len]);
 358   memcpy(data, inbuf, len);
 359
 360   nsDependentCString idStr(id);
 361   // Cache it for now, we'll write all together later.
 362   CacheEntry* entry;
 363
 364 #ifdef DEBUG
 365   mTable.Get(idStr, &entry);
 366   NS_ASSERTION(entry == nullptr, "Existing entry in StartupCache.");
 367
 368   if (mArchive) {
 369     nsZipItem* zipItem = mArchive->GetItem(id);
 370     NS_ASSERTION(zipItem == nullptr, "Existing entry in disk StartupCache.");
 371   }
 372 #endif
 373
 374   entry = new CacheEntry(data.forget(), len);
 375   mTable.Put(idStr, entry);
 376   return ResetStartupWriteTimer();
 377 }
 378
 379 size_t
 380 StartupCache::SizeOfMapping()
 381 {
 382     return mArchive ? mArchive->SizeOfMapping() : 0;
 383 }
 384
 385 size_t
 386 StartupCache::HeapSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
 387 {
 388     // This function could measure more members, but they haven't been found by
 389     // DMD to be significant.  They can be added later if necessary.
 390     return aMallocSizeOf(this) +
 391            mTable.SizeOfExcludingThis(SizeOfEntryExcludingThis, aMallocSizeOf);
 392 }
 393
 394 /* static */ size_t
 395 StartupCache::SizeOfEntryExcludingThis(const nsACString& key, const nsAutoPtr<CacheEntry>& data,
 396                                        mozilla::MallocSizeOf mallocSizeOf, void *)
 397 {
 398     return data->SizeOfExcludingThis(mallocSizeOf);
 399 }
 400
 401 struct CacheWriteHolder
 402 {
 403   nsCOMPtr<nsIZipWriter> writer;
 404   nsCOMPtr<nsIStringInputStream> stream;
 405   PRTime time;
 406 };
 407
 408 PLDHashOperator
 409 CacheCloseHelper(const nsACString& key, nsAutoPtr<CacheEntry>& data,
 410                  void* closure)
 411 {
 412   nsresult rv;
 413
 414   CacheWriteHolder* holder = (CacheWriteHolder*) closure;
 415   nsIStringInputStream* stream = holder->stream;
 416   nsIZipWriter* writer = holder->writer;
 417
 418   stream->ShareData(data->data, data->size);
 419
 420 #ifdef DEBUG
 421   bool hasEntry;
 422   rv = writer->HasEntry(key, &hasEntry);
 423   NS_ASSERTION(NS_SUCCEEDED(rv) && hasEntry == false,
 424                "Existing entry in disk StartupCache.");
 425 #endif
 426   rv = writer->AddEntryStream(key, holder->time, true, stream, false);
 427
 428   if (NS_FAILED(rv)) {
 429     NS_WARNING("cache entry deleted but not written to disk.");
 430   }
 431   return PL_DHASH_REMOVE;
 432 }
 433
 434
 435 /**
 436  * WriteToDisk writes the cache out to disk. Callers of WriteToDisk need to call WaitOnWriteThread
 437  * to make sure there isn't a write happening on another thread
 438  */
 439 void
 440 StartupCache::WriteToDisk()
 441 {
 442   nsresult rv;
 443   mStartupWriteInitiated = true;
 444
 445   if (mTable.Count() == 0)
 446     return;
 447
 448   nsCOMPtr<nsIZipWriter> zipW = do_CreateInstance("@mozilla.org/zipwriter;1");
 449   if (!zipW)
 450     return;
 451
 452   rv = zipW->Open(mFile, PR_RDWR | PR_CREATE_FILE);
 453   if (NS_FAILED(rv)) {
 454     NS_WARNING("could not open zipfile for write");
 455     return;
 456   }
 457
 458   // If we didn't have an mArchive member, that means that we failed to
 459   // open the startup cache for reading.  Therefore, we need to record
 460   // the time of creation in a zipfile comment; this will be useful for
 461   // Telemetry statistics.
 462   PRTime now = PR_Now();
 463   if (!mArchive) {
 464     nsCString comment;
 465     comment.Assign((char *)&now, sizeof(now));
 466     zipW->SetComment(comment);
 467   }
 468
 469   nsCOMPtr<nsIStringInputStream> stream
 470     = do_CreateInstance("@mozilla.org/io/string-input-stream;1", &rv);
 471   if (NS_FAILED(rv)) {
 472     NS_WARNING("Couldn't create string input stream.");
 473     return;
 474   }
 475
 476   CacheWriteHolder holder;
 477   holder.stream = stream;
 478   holder.writer = zipW;
 479   holder.time = now;
 480
 481   mTable.Enumerate(CacheCloseHelper, &holder);
 482
 483   // Close the archive so Windows doesn't choke.
 484   mArchive = nullptr;
 485   zipW->Close();
 486
 487   // We succesfully wrote the archive to disk; mark the disk file as trusted
 488   gIgnoreDiskCache = false;
 489
 490   // Our reader's view of the archive is outdated now, reload it.
 491   LoadArchive(gPostFlushAgeAction);
 492
 493   return;
 494 }
 495
 496 void
 497 StartupCache::InvalidateCache()
 498 {
 499   WaitOnWriteThread();
 500   mTable.Clear();
 501   mArchive = nullptr;
 502   nsresult rv = mFile->Remove(false);
 503   if (NS_FAILED(rv) && rv != NS_ERROR_FILE_TARGET_DOES_NOT_EXIST &&
 504       rv != NS_ERROR_FILE_NOT_FOUND) {
 505     gIgnoreDiskCache = true;
 506     mozilla::Telemetry::Accumulate(Telemetry::STARTUP_CACHE_INVALID, true);
 507     return;
 508   }
 509   gIgnoreDiskCache = false;
 510   LoadArchive(gPostFlushAgeAction);
 511 }
 512
 513 void
 514 StartupCache::IgnoreDiskCache()
 515 {
 516   gIgnoreDiskCache = true;
 517   if (gStartupCache)
 518     gStartupCache->InvalidateCache();
 519 }
 520
 521 /*
 522  * WaitOnWriteThread() is called from a main thread to wait for the worker
 523  * thread to finish. However since the same code is used in the worker thread and
 524  * main thread, the worker thread can also call WaitOnWriteThread() which is a no-op.
 525  */
 526 void
 527 StartupCache::WaitOnWriteThread()
 528 {
 529   NS_ASSERTION(NS_IsMainThread(), "Startup cache should only wait for io thread on main thread");
 530   if (!mWriteThread || mWriteThread == PR_GetCurrentThread())
 531     return;
 532
 533   PR_JoinThread(mWriteThread);
 534   mWriteThread = nullptr;
 535 }
 536
 537 void
 538 StartupCache::ThreadedWrite(void *aClosure)
 539 {
 540   PR_SetCurrentThreadName("StartupCache");
 541   mozilla::IOInterposer::RegisterCurrentThread();
 542   /*
 543    * It is safe to use the pointer passed in aClosure to reference the
 544    * StartupCache object because the thread's lifetime is tightly coupled to
 545    * the lifetime of the StartupCache object; this thread is joined in the
 546    * StartupCache destructor, guaranteeing that this function runs if and only
 547    * if the StartupCache object is valid.
 548    */
 549   StartupCache* startupCacheObj = static_cast<StartupCache*>(aClosure);
 550   startupCacheObj->WriteToDisk();
 551   mozilla::IOInterposer::UnregisterCurrentThread();
 552 }
 553
 554 /*
 555  * The write-thread is spawned on a timeout(which is reset with every write). This
 556  * can avoid a slow shutdown. After writing out the cache, the zipreader is
 557  * reloaded on the worker thread.
 558  */
 559 void
 560 StartupCache::WriteTimeout(nsITimer *aTimer, void *aClosure)
 561 {
 562   /*
 563    * It is safe to use the pointer passed in aClosure to reference the
 564    * StartupCache object because the timer's lifetime is tightly coupled to
 565    * the lifetime of the StartupCache object; this timer is canceled in the
 566    * StartupCache destructor, guaranteeing that this function runs if and only
 567    * if the StartupCache object is valid.
 568    */
 569   StartupCache* startupCacheObj = static_cast<StartupCache*>(aClosure);
 570   startupCacheObj->mWriteThread = PR_CreateThread(PR_USER_THREAD,
 571                                                   StartupCache::ThreadedWrite,
 572                                                   startupCacheObj,
 573                                                   PR_PRIORITY_NORMAL,
 574                                                   PR_GLOBAL_THREAD,
 575                                                   PR_JOINABLE_THREAD,
 576                                                   0);
 577 }
 578
 579 // We don't want to refcount StartupCache, so we'll just
 580 // hold a ref to this and pass it to observerService instead.
 581 NS_IMPL_ISUPPORTS(StartupCacheListener, nsIObserver)
 582
 583 nsresult
 584 StartupCacheListener::Observe(nsISupports *subject, const char* topic, const char16_t* data)
 585 {
 586   StartupCache* sc = StartupCache::GetSingleton();
 587   if (!sc)
 588     return NS_OK;
 589
 590   if (strcmp(topic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
 591     // Do not leave the thread running past xpcom shutdown
 592     sc->WaitOnWriteThread();
 593     StartupCache::gShutdownInitiated = true;
 594   } else if (strcmp(topic, "startupcache-invalidate") == 0) {
 595     sc->InvalidateCache();
 596   }
 597   return NS_OK;
 598 }
 599
 600 nsresult
 601 StartupCache::GetDebugObjectOutputStream(nsIObjectOutputStream* aStream,
 602                                          nsIObjectOutputStream** aOutStream)
 603 {
 604   NS_ENSURE_ARG_POINTER(aStream);
 605 #ifdef DEBUG
 606   StartupCacheDebugOutputStream* stream
 607     = new StartupCacheDebugOutputStream(aStream, &mWriteObjectMap);
 608   NS_ADDREF(*aOutStream = stream);
 609 #else
 610   NS_ADDREF(*aOutStream = aStream);
 611 #endif
 612
 613   return NS_OK;
 614 }
 615
 616 nsresult
 617 StartupCache::ResetStartupWriteTimer()
 618 {
 619   mStartupWriteInitiated = false;
 620   nsresult rv;
 621   if (!mTimer)
 622     mTimer = do_CreateInstance("@mozilla.org/timer;1", &rv);
 623   else
 624     rv = mTimer->Cancel();
 625   NS_ENSURE_SUCCESS(rv, rv);
 626   // Wait for 10 seconds, then write out the cache.
 627   mTimer->InitWithFuncCallback(StartupCache::WriteTimeout, this, 60000,
 628                                nsITimer::TYPE_ONE_SHOT);
 629   return NS_OK;
 630 }
 631
 632 nsresult
 633 StartupCache::RecordAgesAlways()
 634 {
 635   gPostFlushAgeAction = RECORD_AGE;
 636   return NS_OK;
 637 }
 638
 639 // StartupCacheDebugOutputStream implementation
 640 #ifdef DEBUG
 641 NS_IMPL_ISUPPORTS(StartupCacheDebugOutputStream, nsIObjectOutputStream,
 642                   nsIBinaryOutputStream, nsIOutputStream)
 643
 644 bool
 645 StartupCacheDebugOutputStream::CheckReferences(nsISupports* aObject)
 646 {
 647   nsresult rv;
 648
 649   nsCOMPtr<nsIClassInfo> classInfo = do_QueryInterface(aObject);
 650   if (!classInfo) {
 651     NS_ERROR("aObject must implement nsIClassInfo");
 652     return false;
 653   }
 654
 655   uint32_t flags;
 656   rv = classInfo->GetFlags(&flags);
 657   NS_ENSURE_SUCCESS(rv, false);
 658   if (flags & nsIClassInfo::SINGLETON)
 659     return true;
 660
 661   nsISupportsHashKey* key = mObjectMap->GetEntry(aObject);
 662   if (key) {
 663     NS_ERROR("non-singleton aObject is referenced multiple times in this"
 664                   "serialization, we don't support that.");
 665     return false;
 666   }
 667
 668   mObjectMap->PutEntry(aObject);
 669   return true;
 670 }
 671
 672 // nsIObjectOutputStream implementation
 673 nsresult
 674 StartupCacheDebugOutputStream::WriteObject(nsISupports* aObject, bool aIsStrongRef)
 675 {
 676   nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
 677
 678   NS_ASSERTION(rootObject.get() == aObject,
 679                "bad call to WriteObject -- call WriteCompoundObject!");
 680   bool check = CheckReferences(aObject);
 681   NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
 682   return mBinaryStream->WriteObject(aObject, aIsStrongRef);
 683 }
 684
 685 nsresult
 686 StartupCacheDebugOutputStream::WriteSingleRefObject(nsISupports* aObject)
 687 {
 688   nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
 689
 690   NS_ASSERTION(rootObject.get() == aObject,
 691                "bad call to WriteSingleRefObject -- call WriteCompoundObject!");
 692   bool check = CheckReferences(aObject);
 693   NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
 694   return mBinaryStream->WriteSingleRefObject(aObject);
 695 }
 696
 697 nsresult
 698 StartupCacheDebugOutputStream::WriteCompoundObject(nsISupports* aObject,
 699                                                 const nsIID& aIID,
 700                                                 bool aIsStrongRef)
 701 {
 702   nsCOMPtr<nsISupports> rootObject(do_QueryInterface(aObject));
 703
 704   nsCOMPtr<nsISupports> roundtrip;
 705   rootObject->QueryInterface(aIID, getter_AddRefs(roundtrip));
 706   NS_ASSERTION(roundtrip.get() == aObject,
 707                "bad aggregation or multiple inheritance detected by call to "
 708                "WriteCompoundObject!");
 709
 710   bool check = CheckReferences(aObject);
 711   NS_ENSURE_TRUE(check, NS_ERROR_FAILURE);
 712   return mBinaryStream->WriteCompoundObject(aObject, aIID, aIsStrongRef);
 713 }
 714
 715 nsresult
 716 StartupCacheDebugOutputStream::WriteID(nsID const& aID)
 717 {
 718   return mBinaryStream->WriteID(aID);
 719 }
 720
 721 char*
 722 StartupCacheDebugOutputStream::GetBuffer(uint32_t aLength, uint32_t aAlignMask)
 723 {
 724   return mBinaryStream->GetBuffer(aLength, aAlignMask);
 725 }
 726
 727 void
 728 StartupCacheDebugOutputStream::PutBuffer(char* aBuffer, uint32_t aLength)
 729 {
 730   mBinaryStream->PutBuffer(aBuffer, aLength);
 731 }
 732 #endif //DEBUG
 733
 734 StartupCacheWrapper* StartupCacheWrapper::gStartupCacheWrapper = nullptr;
 735
 736 NS_IMPL_ISUPPORTS(StartupCacheWrapper, nsIStartupCache)
 737
 738 StartupCacheWrapper* StartupCacheWrapper::GetSingleton()
 739 {
 740   if (!gStartupCacheWrapper)
 741     gStartupCacheWrapper = new StartupCacheWrapper();
 742
 743   NS_ADDREF(gStartupCacheWrapper);
 744   return gStartupCacheWrapper;
 745 }
 746
 747 nsresult
 748 StartupCacheWrapper::GetBuffer(const char* id, char** outbuf, uint32_t* length)
 749 {
 750   StartupCache* sc = StartupCache::GetSingleton();
 751   if (!sc) {
 752     return NS_ERROR_NOT_INITIALIZED;
 753   }
 754   return sc->GetBuffer(id, outbuf, length);
 755 }
 756
 757 nsresult
 758 StartupCacheWrapper::PutBuffer(const char* id, const char* inbuf, uint32_t length)
 759 {
 760   StartupCache* sc = StartupCache::GetSingleton();
 761   if (!sc) {
 762     return NS_ERROR_NOT_INITIALIZED;
 763   }
 764   return sc->PutBuffer(id, inbuf, length);
 765 }
 766
 767 nsresult
 768 StartupCacheWrapper::InvalidateCache()
 769 {
 770   StartupCache* sc = StartupCache::GetSingleton();
 771   if (!sc) {
 772     return NS_ERROR_NOT_INITIALIZED;
 773   }
 774   sc->InvalidateCache();
 775   return NS_OK;
 776 }
 777
 778 nsresult
 779 StartupCacheWrapper::IgnoreDiskCache()
 780 {
 781   StartupCache::IgnoreDiskCache();
 782   return NS_OK;
 783 }
 784
 785 nsresult
 786 StartupCacheWrapper::GetDebugObjectOutputStream(nsIObjectOutputStream* stream,
 787                                                 nsIObjectOutputStream** outStream)
 788 {
 789   StartupCache* sc = StartupCache::GetSingleton();
 790   if (!sc) {
 791     return NS_ERROR_NOT_INITIALIZED;
 792   }
 793   return sc->GetDebugObjectOutputStream(stream, outStream);
 794 }
 795
 796 nsresult
 797 StartupCacheWrapper::StartupWriteComplete(bool *complete)
 798 {
 799   StartupCache* sc = StartupCache::GetSingleton();
 800   if (!sc) {
 801     return NS_ERROR_NOT_INITIALIZED;
 802   }
 803   sc->WaitOnWriteThread();
 804   *complete = sc->mStartupWriteInitiated && sc->mTable.Count() == 0;
 805   return NS_OK;
 806 }
 807
 808 nsresult
 809 StartupCacheWrapper::ResetStartupWriteTimer()
 810 {
 811   StartupCache* sc = StartupCache::GetSingleton();
 812   return sc ? sc->ResetStartupWriteTimer() : NS_ERROR_NOT_INITIALIZED;
 813 }
 814
 815 nsresult
 816 StartupCacheWrapper::GetObserver(nsIObserver** obv) {
 817   StartupCache* sc = StartupCache::GetSingleton();
 818   if (!sc) {
 819     return NS_ERROR_NOT_INITIALIZED;
 820   }
 821   NS_ADDREF(*obv = sc->mListener);
 822   return NS_OK;
 823 }
 824
 825 nsresult
 826 StartupCacheWrapper::RecordAgesAlways() {
 827   StartupCache *sc = StartupCache::GetSingleton();
 828   return sc ? sc->RecordAgesAlways() : NS_ERROR_NOT_INITIALIZED;
 829 }
 830
 831 } // namespace scache
 832 } // namespace mozilla