lib/Frontend/CompilerInstance.cpp

   1 //===--- CompilerInstance.cpp ---------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "clang/Frontend/CompilerInstance.h"
  11 #include "clang/Sema/Sema.h"
  12 #include "clang/AST/ASTConsumer.h"
  13 #include "clang/AST/ASTContext.h"
  14 #include "clang/Basic/Diagnostic.h"
  15 #include "clang/Basic/FileManager.h"
  16 #include "clang/Basic/SourceManager.h"
  17 #include "clang/Basic/TargetInfo.h"
  18 #include "clang/Basic/Version.h"
  19 #include "clang/Lex/HeaderSearch.h"
  20 #include "clang/Lex/Preprocessor.h"
  21 #include "clang/Lex/PTHManager.h"
  22 #include "clang/Frontend/ChainedDiagnosticClient.h"
  23 #include "clang/Frontend/FrontendAction.h"
  24 #include "clang/Frontend/FrontendDiagnostic.h"
  25 #include "clang/Frontend/TextDiagnosticPrinter.h"
  26 #include "clang/Frontend/VerifyDiagnosticsClient.h"
  27 #include "clang/Frontend/Utils.h"
  28 #include "clang/Serialization/ASTReader.h"
  29 #include "clang/Sema/CodeCompleteConsumer.h"
  30 #include "llvm/Support/FileSystem.h"
  31 #include "llvm/Support/MemoryBuffer.h"
  32 #include "llvm/Support/raw_ostream.h"
  33 #include "llvm/ADT/Statistic.h"
  34 #include "llvm/Support/Timer.h"
  35 #include "llvm/Support/Host.h"
  36 #include "llvm/Support/Path.h"
  37 #include "llvm/Support/Program.h"
  38 #include "llvm/Support/Signals.h"
  39 #include "llvm/Support/system_error.h"
  40 using namespace clang;
  41
  42 CompilerInstance::CompilerInstance()
  43   : Invocation(new CompilerInvocation()) {
  44 }
  45
  46 CompilerInstance::~CompilerInstance() {
  47 }
  48
  49 void CompilerInstance::setInvocation(CompilerInvocation *Value) {
  50   Invocation.reset(Value);
  51 }
  52
  53 void CompilerInstance::setDiagnostics(Diagnostic *Value) {
  54   Diagnostics = Value;
  55 }
  56
  57 void CompilerInstance::setTarget(TargetInfo *Value) {
  58   Target.reset(Value);
  59 }
  60
  61 void CompilerInstance::setFileManager(FileManager *Value) {
  62   FileMgr.reset(Value);
  63 }
  64
  65 void CompilerInstance::setSourceManager(SourceManager *Value) {
  66   SourceMgr.reset(Value);
  67 }
  68
  69 void CompilerInstance::setPreprocessor(Preprocessor *Value) {
  70   PP.reset(Value);
  71 }
  72
  73 void CompilerInstance::setASTContext(ASTContext *Value) {
  74   Context.reset(Value);
  75 }
  76
  77 void CompilerInstance::setSema(Sema *S) {
  78   TheSema.reset(S);
  79 }
  80
  81 void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
  82   Consumer.reset(Value);
  83 }
  84
  85 void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
  86   CompletionConsumer.reset(Value);
  87 }
  88
  89 // Diagnostics
  90 static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
  91                               unsigned argc, const char* const *argv,
  92                               Diagnostic &Diags) {
  93   std::string ErrorInfo;
  94   llvm::OwningPtr<llvm::raw_ostream> OS(
  95     new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo));
  96   if (!ErrorInfo.empty()) {
  97     Diags.Report(diag::err_fe_unable_to_open_logfile)
  98                  << DiagOpts.DumpBuildInformation << ErrorInfo;
  99     return;
 100   }
 101
 102   (*OS) << "clang -cc1 command line arguments: ";
 103   for (unsigned i = 0; i != argc; ++i)
 104     (*OS) << argv[i] << ' ';
 105   (*OS) << '\n';
 106
 107   // Chain in a diagnostic client which will log the diagnostics.
 108   DiagnosticClient *Logger =
 109     new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true);
 110   Diags.setClient(new ChainedDiagnosticClient(Diags.takeClient(), Logger));
 111 }
 112
 113 void CompilerInstance::createDiagnostics(int Argc, const char* const *Argv,
 114                                          DiagnosticClient *Client) {
 115   Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv, Client);
 116 }
 117
 118 llvm::IntrusiveRefCntPtr<Diagnostic>
 119 CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
 120                                     int Argc, const char* const *Argv,
 121                                     DiagnosticClient *Client) {
 122   llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 123   llvm::IntrusiveRefCntPtr<Diagnostic> Diags(new Diagnostic(DiagID));
 124
 125   // Create the diagnostic client for reporting errors or for
 126   // implementing -verify.
 127   if (Client)
 128     Diags->setClient(Client);
 129   else
 130     Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
 131
 132   // Chain in -verify checker, if requested.
 133   if (Opts.VerifyDiagnostics)
 134     Diags->setClient(new VerifyDiagnosticsClient(*Diags, Diags->takeClient()));
 135
 136   if (!Opts.DumpBuildInformation.empty())
 137     SetUpBuildDumpLog(Opts, Argc, Argv, *Diags);
 138
 139   // Configure our handling of diagnostics.
 140   ProcessWarningOptions(*Diags, Opts);
 141
 142   return Diags;
 143 }
 144
 145 // File Manager
 146
 147 void CompilerInstance::createFileManager() {
 148   FileMgr.reset(new FileManager(getFileSystemOpts()));
 149 }
 150
 151 // Source Manager
 152
 153 void CompilerInstance::createSourceManager(FileManager &FileMgr) {
 154   SourceMgr.reset(new SourceManager(getDiagnostics(), FileMgr));
 155 }
 156
 157 // Preprocessor
 158
 159 void CompilerInstance::createPreprocessor() {
 160   PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
 161                               getPreprocessorOpts(), getHeaderSearchOpts(),
 162                               getDependencyOutputOpts(), getTarget(),
 163                               getFrontendOpts(), getSourceManager(),
 164                               getFileManager()));
 165 }
 166
 167 Preprocessor *
 168 CompilerInstance::createPreprocessor(Diagnostic &Diags,
 169                                      const LangOptions &LangInfo,
 170                                      const PreprocessorOptions &PPOpts,
 171                                      const HeaderSearchOptions &HSOpts,
 172                                      const DependencyOutputOptions &DepOpts,
 173                                      const TargetInfo &Target,
 174                                      const FrontendOptions &FEOpts,
 175                                      SourceManager &SourceMgr,
 176                                      FileManager &FileMgr) {
 177   // Create a PTH manager if we are using some form of a token cache.
 178   PTHManager *PTHMgr = 0;
 179   if (!PPOpts.TokenCache.empty())
 180     PTHMgr = PTHManager::Create(PPOpts.TokenCache, Diags);
 181
 182   // Create the Preprocessor.
 183   HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
 184   Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
 185                                       SourceMgr, *HeaderInfo, PTHMgr,
 186                                       /*OwnsHeaderSearch=*/true);
 187
 188   // Note that this is different then passing PTHMgr to Preprocessor's ctor.
 189   // That argument is used as the IdentifierInfoLookup argument to
 190   // IdentifierTable's ctor.
 191   if (PTHMgr) {
 192     PTHMgr->setPreprocessor(PP);
 193     PP->setPTHManager(PTHMgr);
 194   }
 195
 196   if (PPOpts.DetailedRecord)
 197     PP->createPreprocessingRecord();
 198
 199   InitializePreprocessor(*PP, PPOpts, HSOpts, FEOpts);
 200
 201   // Handle generating dependencies, if requested.
 202   if (!DepOpts.OutputFile.empty())
 203     AttachDependencyFileGen(*PP, DepOpts);
 204
 205   // Handle generating header include information, if requested.
 206   if (DepOpts.ShowHeaderIncludes)
 207     AttachHeaderIncludeGen(*PP);
 208   if (!DepOpts.HeaderIncludeOutputFile.empty()) {
 209     llvm::StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
 210     if (OutputPath == "-")
 211       OutputPath = "";
 212     AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/true, OutputPath);
 213   }
 214
 215   return PP;
 216 }
 217
 218 // ASTContext
 219
 220 void CompilerInstance::createASTContext() {
 221   Preprocessor &PP = getPreprocessor();
 222   Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
 223                                getTarget(), PP.getIdentifierTable(),
 224                                PP.getSelectorTable(), PP.getBuiltinInfo(),
 225                                /*size_reserve=*/ 0));
 226 }
 227
 228 // ExternalASTSource
 229
 230 void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
 231                                                   bool DisablePCHValidation,
 232                                                   bool DisableStatCache,
 233                                                  void *DeserializationListener){
 234   llvm::OwningPtr<ExternalASTSource> Source;
 235   bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
 236   Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
 237                                           DisablePCHValidation,
 238                                           DisableStatCache,
 239                                           getPreprocessor(), getASTContext(),
 240                                           DeserializationListener,
 241                                           Preamble));
 242   getASTContext().setExternalSource(Source);
 243 }
 244
 245 ExternalASTSource *
 246 CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
 247                                              const std::string &Sysroot,
 248                                              bool DisablePCHValidation,
 249                                              bool DisableStatCache,
 250                                              Preprocessor &PP,
 251                                              ASTContext &Context,
 252                                              void *DeserializationListener,
 253                                              bool Preamble) {
 254   llvm::OwningPtr<ASTReader> Reader;
 255   Reader.reset(new ASTReader(PP, &Context,
 256                              Sysroot.empty() ? 0 : Sysroot.c_str(),
 257                              DisablePCHValidation, DisableStatCache));
 258
 259   Reader->setDeserializationListener(
 260             static_cast<ASTDeserializationListener *>(DeserializationListener));
 261   switch (Reader->ReadAST(Path,
 262                           Preamble ? ASTReader::Preamble : ASTReader::PCH)) {
 263   case ASTReader::Success:
 264     // Set the predefines buffer as suggested by the PCH reader. Typically, the
 265     // predefines buffer will be empty.
 266     PP.setPredefines(Reader->getSuggestedPredefines());
 267     return Reader.take();
 268
 269   case ASTReader::Failure:
 270     // Unrecoverable failure: don't even try to process the input file.
 271     break;
 272
 273   case ASTReader::IgnorePCH:
 274     // No suitable PCH file could be found. Return an error.
 275     break;
 276   }
 277
 278   return 0;
 279 }
 280
 281 // Code Completion
 282
 283 static bool EnableCodeCompletion(Preprocessor &PP,
 284                                  const std::string &Filename,
 285                                  unsigned Line,
 286                                  unsigned Column) {
 287   // Tell the source manager to chop off the given file at a specific
 288   // line and column.
 289   const FileEntry *Entry = PP.getFileManager().getFile(Filename);
 290   if (!Entry) {
 291     PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
 292       << Filename;
 293     return true;
 294   }
 295
 296   // Truncate the named file at the given line/column.
 297   PP.SetCodeCompletionPoint(Entry, Line, Column);
 298   return false;
 299 }
 300
 301 void CompilerInstance::createCodeCompletionConsumer() {
 302   const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
 303   if (!CompletionConsumer) {
 304     CompletionConsumer.reset(
 305       createCodeCompletionConsumer(getPreprocessor(),
 306                                    Loc.FileName, Loc.Line, Loc.Column,
 307                                    getFrontendOpts().ShowMacrosInCodeCompletion,
 308                              getFrontendOpts().ShowCodePatternsInCodeCompletion,
 309                            getFrontendOpts().ShowGlobalSymbolsInCodeCompletion,
 310                                    llvm::outs()));
 311     if (!CompletionConsumer)
 312       return;
 313   } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
 314                                   Loc.Line, Loc.Column)) {
 315     CompletionConsumer.reset();
 316     return;
 317   }
 318
 319   if (CompletionConsumer->isOutputBinary() &&
 320       llvm::sys::Program::ChangeStdoutToBinary()) {
 321     getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
 322     CompletionConsumer.reset();
 323   }
 324 }
 325
 326 void CompilerInstance::createFrontendTimer() {
 327   FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
 328 }
 329
 330 CodeCompleteConsumer *
 331 CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
 332                                                const std::string &Filename,
 333                                                unsigned Line,
 334                                                unsigned Column,
 335                                                bool ShowMacros,
 336                                                bool ShowCodePatterns,
 337                                                bool ShowGlobals,
 338                                                llvm::raw_ostream &OS) {
 339   if (EnableCodeCompletion(PP, Filename, Line, Column))
 340     return 0;
 341
 342   // Set up the creation routine for code-completion.
 343   return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
 344                                           ShowGlobals, OS);
 345 }
 346
 347 void CompilerInstance::createSema(bool CompleteTranslationUnit,
 348                                   CodeCompleteConsumer *CompletionConsumer) {
 349   TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
 350                          CompleteTranslationUnit, CompletionConsumer));
 351 }
 352
 353 // Output Files
 354
 355 void CompilerInstance::addOutputFile(const OutputFile &OutFile) {
 356   assert(OutFile.OS && "Attempt to add empty stream to output list!");
 357   OutputFiles.push_back(OutFile);
 358 }
 359
 360 void CompilerInstance::clearOutputFiles(bool EraseFiles) {
 361   for (std::list<OutputFile>::iterator
 362          it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
 363     delete it->OS;
 364     if (!it->TempFilename.empty()) {
 365       llvm::sys::Path TempPath(it->TempFilename);
 366       if (EraseFiles)
 367         TempPath.eraseFromDisk();
 368       else {
 369         std::string Error;
 370         llvm::sys::Path NewOutFile(it->Filename);
 371         // If '-working-directory' was passed, the output filename should be
 372         // relative to that.
 373         FileManager::FixupRelativePath(NewOutFile, getFileSystemOpts());
 374         if (TempPath.renamePathOnDisk(NewOutFile, &Error)) {
 375           getDiagnostics().Report(diag::err_fe_unable_to_rename_temp)
 376             << it->TempFilename << it->Filename << Error;
 377           TempPath.eraseFromDisk();
 378         }
 379       }
 380     } else if (!it->Filename.empty() && EraseFiles)
 381       llvm::sys::Path(it->Filename).eraseFromDisk();
 382
 383   }
 384   OutputFiles.clear();
 385 }
 386
 387 llvm::raw_fd_ostream *
 388 CompilerInstance::createDefaultOutputFile(bool Binary,
 389                                           llvm::StringRef InFile,
 390                                           llvm::StringRef Extension) {
 391   return createOutputFile(getFrontendOpts().OutputFile, Binary,
 392                           /*RemoveFileOnSignal=*/true, InFile, Extension);
 393 }
 394
 395 llvm::raw_fd_ostream *
 396 CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
 397                                    bool Binary, bool RemoveFileOnSignal,
 398                                    llvm::StringRef InFile,
 399                                    llvm::StringRef Extension) {
 400   std::string Error, OutputPathName, TempPathName;
 401   llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
 402                                               RemoveFileOnSignal,
 403                                               InFile, Extension,
 404                                               &OutputPathName,
 405                                               &TempPathName);
 406   if (!OS) {
 407     getDiagnostics().Report(diag::err_fe_unable_to_open_output)
 408       << OutputPath << Error;
 409     return 0;
 410   }
 411
 412   // Add the output file -- but don't try to remove "-", since this means we are
 413   // using stdin.
 414   addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "",
 415                 TempPathName, OS));
 416
 417   return OS;
 418 }
 419
 420 llvm::raw_fd_ostream *
 421 CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
 422                                    std::string &Error,
 423                                    bool Binary,
 424                                    bool RemoveFileOnSignal,
 425                                    llvm::StringRef InFile,
 426                                    llvm::StringRef Extension,
 427                                    std::string *ResultPathName,
 428                                    std::string *TempPathName) {
 429   std::string OutFile, TempFile;
 430   if (!OutputPath.empty()) {
 431     OutFile = OutputPath;
 432   } else if (InFile == "-") {
 433     OutFile = "-";
 434   } else if (!Extension.empty()) {
 435     llvm::sys::Path Path(InFile);
 436     Path.eraseSuffix();
 437     Path.appendSuffix(Extension);
 438     OutFile = Path.str();
 439   } else {
 440     OutFile = "-";
 441   }
 442
 443   if (OutFile != "-") {
 444     llvm::sys::Path OutPath(OutFile);
 445     // Only create the temporary if we can actually write to OutPath, otherwise
 446     // we want to fail early.
 447     bool Exists;
 448     if ((llvm::sys::fs::exists(OutPath.str(), Exists) || !Exists) ||
 449         (OutPath.isRegularFile() && OutPath.canWrite())) {
 450       // Create a temporary file.
 451       llvm::sys::Path TempPath(OutFile);
 452       if (!TempPath.createTemporaryFileOnDisk())
 453         TempFile = TempPath.str();
 454     }
 455   }
 456
 457   std::string OSFile = OutFile;
 458   if (!TempFile.empty())
 459     OSFile = TempFile;
 460
 461   llvm::OwningPtr<llvm::raw_fd_ostream> OS(
 462     new llvm::raw_fd_ostream(OSFile.c_str(), Error,
 463                              (Binary ? llvm::raw_fd_ostream::F_Binary : 0)));
 464   if (!Error.empty())
 465     return 0;
 466
 467   // Make sure the out stream file gets removed if we crash.
 468   if (RemoveFileOnSignal)
 469     llvm::sys::RemoveFileOnSignal(llvm::sys::Path(OSFile));
 470
 471   if (ResultPathName)
 472     *ResultPathName = OutFile;
 473   if (TempPathName)
 474     *TempPathName = TempFile;
 475
 476   return OS.take();
 477 }
 478
 479 // Initialization Utilities
 480
 481 bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
 482   return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
 483                                  getSourceManager(), getFrontendOpts());
 484 }
 485
 486 bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
 487                                                Diagnostic &Diags,
 488                                                FileManager &FileMgr,
 489                                                SourceManager &SourceMgr,
 490                                                const FrontendOptions &Opts) {
 491   // Figure out where to get and map in the main file, unless it's already
 492   // been created (e.g., by a precompiled preamble).
 493   if (!SourceMgr.getMainFileID().isInvalid()) {
 494     // Do nothing: the main file has already been set.
 495   } else if (InputFile != "-") {
 496     const FileEntry *File = FileMgr.getFile(InputFile);
 497     if (!File) {
 498       Diags.Report(diag::err_fe_error_reading) << InputFile;
 499       return false;
 500     }
 501     SourceMgr.createMainFileID(File);
 502   } else {
 503     llvm::OwningPtr<llvm::MemoryBuffer> SB;
 504     if (llvm::MemoryBuffer::getSTDIN(SB)) {
 505       // FIXME: Give ec.message() in this diag.
 506       Diags.Report(diag::err_fe_error_reading_stdin);
 507       return false;
 508     }
 509     const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
 510                                                    SB->getBufferSize(), 0);
 511     SourceMgr.createMainFileID(File);
 512     SourceMgr.overrideFileContents(File, SB.take());
 513   }
 514
 515   assert(!SourceMgr.getMainFileID().isInvalid() &&
 516          "Couldn't establish MainFileID!");
 517   return true;
 518 }
 519
 520 // High-Level Operations
 521
 522 bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
 523   assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
 524   assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
 525   assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
 526
 527   // FIXME: Take this as an argument, once all the APIs we used have moved to
 528   // taking it as an input instead of hard-coding llvm::errs.
 529   llvm::raw_ostream &OS = llvm::errs();
 530
 531   // Create the target instance.
 532   setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts()));
 533   if (!hasTarget())
 534     return false;
 535
 536   // Inform the target of the language options.
 537   //
 538   // FIXME: We shouldn't need to do this, the target should be immutable once
 539   // created. This complexity should be lifted elsewhere.
 540   getTarget().setForcedLangOptions(getLangOpts());
 541
 542   // Validate/process some options.
 543   if (getHeaderSearchOpts().Verbose)
 544     OS << "clang -cc1 version " CLANG_VERSION_STRING
 545        << " based upon " << PACKAGE_STRING
 546        << " hosted on " << llvm::sys::getHostTriple() << "\n";
 547
 548   if (getFrontendOpts().ShowTimers)
 549     createFrontendTimer();
 550
 551   if (getFrontendOpts().ShowStats)
 552     llvm::EnableStatistics();
 553
 554   for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
 555     const std::string &InFile = getFrontendOpts().Inputs[i].second;
 556
 557     // Reset the ID tables if we are reusing the SourceManager.
 558     if (hasSourceManager())
 559       getSourceManager().clearIDTables();
 560
 561     if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) {
 562       Act.Execute();
 563       Act.EndSourceFile();
 564     }
 565   }
 566
 567   if (getDiagnosticOpts().ShowCarets) {
 568     // We can have multiple diagnostics sharing one diagnostic client.
 569     // Get the total number of warnings/errors from the client.
 570     unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
 571     unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
 572
 573     if (NumWarnings)
 574       OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
 575     if (NumWarnings && NumErrors)
 576       OS << " and ";
 577     if (NumErrors)
 578       OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
 579     if (NumWarnings || NumErrors)
 580       OS << " generated.\n";
 581   }
 582
 583   if (getFrontendOpts().ShowStats && hasFileManager()) {
 584     getFileManager().PrintStats();
 585     OS << "\n";
 586   }
 587
 588   return !getDiagnostics().getClient()->getNumErrors();
 589 }
 590
 591