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/LLVMContext.h"
  31 #include "llvm/Support/FileSystem.h"
  32 #include "llvm/Support/MemoryBuffer.h"
  33 #include "llvm/Support/raw_ostream.h"
  34 #include "llvm/ADT/Statistic.h"
  35 #include "llvm/Support/Timer.h"
  36 #include "llvm/Support/Host.h"
  37 #include "llvm/Support/Path.h"
  38 #include "llvm/Support/Program.h"
  39 #include "llvm/Support/Signals.h"
  40 #include "llvm/Support/system_error.h"
  41 using namespace clang;
  42
  43 CompilerInstance::CompilerInstance()
  44   : Invocation(new CompilerInvocation()) {
  45 }
  46
  47 CompilerInstance::~CompilerInstance() {
  48 }
  49
  50 void CompilerInstance::setLLVMContext(llvm::LLVMContext *Value) {
  51   LLVMContext.reset(Value);
  52 }
  53
  54 void CompilerInstance::setInvocation(CompilerInvocation *Value) {
  55   Invocation.reset(Value);
  56 }
  57
  58 void CompilerInstance::setDiagnostics(Diagnostic *Value) {
  59   Diagnostics = Value;
  60 }
  61
  62 void CompilerInstance::setTarget(TargetInfo *Value) {
  63   Target.reset(Value);
  64 }
  65
  66 void CompilerInstance::setFileManager(FileManager *Value) {
  67   FileMgr.reset(Value);
  68 }
  69
  70 void CompilerInstance::setSourceManager(SourceManager *Value) {
  71   SourceMgr.reset(Value);
  72 }
  73
  74 void CompilerInstance::setPreprocessor(Preprocessor *Value) {
  75   PP.reset(Value);
  76 }
  77
  78 void CompilerInstance::setASTContext(ASTContext *Value) {
  79   Context.reset(Value);
  80 }
  81
  82 void CompilerInstance::setSema(Sema *S) {
  83   TheSema.reset(S);
  84 }
  85
  86 void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
  87   Consumer.reset(Value);
  88 }
  89
  90 void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
  91   CompletionConsumer.reset(Value);
  92 }
  93
  94 // Diagnostics
  95 static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
  96                               unsigned argc, const char* const *argv,
  97                               Diagnostic &Diags) {
  98   std::string ErrorInfo;
  99   llvm::OwningPtr<llvm::raw_ostream> OS(
 100     new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo));
 101   if (!ErrorInfo.empty()) {
 102     Diags.Report(diag::err_fe_unable_to_open_logfile)
 103                  << DiagOpts.DumpBuildInformation << ErrorInfo;
 104     return;
 105   }
 106
 107   (*OS) << "clang -cc1 command line arguments: ";
 108   for (unsigned i = 0; i != argc; ++i)
 109     (*OS) << argv[i] << ' ';
 110   (*OS) << '\n';
 111
 112   // Chain in a diagnostic client which will log the diagnostics.
 113   DiagnosticClient *Logger =
 114     new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true);
 115   Diags.setClient(new ChainedDiagnosticClient(Diags.takeClient(), Logger));
 116 }
 117
 118 void CompilerInstance::createDiagnostics(int Argc, const char* const *Argv,
 119                                          DiagnosticClient *Client) {
 120   Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv, Client);
 121 }
 122
 123 llvm::IntrusiveRefCntPtr<Diagnostic>
 124 CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
 125                                     int Argc, const char* const *Argv,
 126                                     DiagnosticClient *Client) {
 127   llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 128   llvm::IntrusiveRefCntPtr<Diagnostic> Diags(new Diagnostic(DiagID));
 129
 130   // Create the diagnostic client for reporting errors or for
 131   // implementing -verify.
 132   if (Client)
 133     Diags->setClient(Client);
 134   else
 135     Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
 136
 137   // Chain in -verify checker, if requested.
 138   if (Opts.VerifyDiagnostics)
 139     Diags->setClient(new VerifyDiagnosticsClient(*Diags, Diags->takeClient()));
 140
 141   if (!Opts.DumpBuildInformation.empty())
 142     SetUpBuildDumpLog(Opts, Argc, Argv, *Diags);
 143
 144   // Configure our handling of diagnostics.
 145   ProcessWarningOptions(*Diags, Opts);
 146
 147   return Diags;
 148 }
 149
 150 // File Manager
 151
 152 void CompilerInstance::createFileManager() {
 153   FileMgr.reset(new FileManager(getFileSystemOpts()));
 154 }
 155
 156 // Source Manager
 157
 158 void CompilerInstance::createSourceManager(FileManager &FileMgr) {
 159   SourceMgr.reset(new SourceManager(getDiagnostics(), FileMgr));
 160 }
 161
 162 // Preprocessor
 163
 164 void CompilerInstance::createPreprocessor() {
 165   PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
 166                               getPreprocessorOpts(), getHeaderSearchOpts(),
 167                               getDependencyOutputOpts(), getTarget(),
 168                               getFrontendOpts(), getSourceManager(),
 169                               getFileManager()));
 170 }
 171
 172 Preprocessor *
 173 CompilerInstance::createPreprocessor(Diagnostic &Diags,
 174                                      const LangOptions &LangInfo,
 175                                      const PreprocessorOptions &PPOpts,
 176                                      const HeaderSearchOptions &HSOpts,
 177                                      const DependencyOutputOptions &DepOpts,
 178                                      const TargetInfo &Target,
 179                                      const FrontendOptions &FEOpts,
 180                                      SourceManager &SourceMgr,
 181                                      FileManager &FileMgr) {
 182   // Create a PTH manager if we are using some form of a token cache.
 183   PTHManager *PTHMgr = 0;
 184   if (!PPOpts.TokenCache.empty())
 185     PTHMgr = PTHManager::Create(PPOpts.TokenCache, Diags);
 186
 187   // Create the Preprocessor.
 188   HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
 189   Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
 190                                       SourceMgr, *HeaderInfo, PTHMgr,
 191                                       /*OwnsHeaderSearch=*/true);
 192
 193   // Note that this is different then passing PTHMgr to Preprocessor's ctor.
 194   // That argument is used as the IdentifierInfoLookup argument to
 195   // IdentifierTable's ctor.
 196   if (PTHMgr) {
 197     PTHMgr->setPreprocessor(PP);
 198     PP->setPTHManager(PTHMgr);
 199   }
 200
 201   if (PPOpts.DetailedRecord)
 202     PP->createPreprocessingRecord();
 203
 204   InitializePreprocessor(*PP, PPOpts, HSOpts, FEOpts);
 205
 206   // Handle generating dependencies, if requested.
 207   if (!DepOpts.OutputFile.empty())
 208     AttachDependencyFileGen(*PP, DepOpts);
 209
 210   // Handle generating header include information, if requested.
 211   if (DepOpts.ShowHeaderIncludes)
 212     AttachHeaderIncludeGen(*PP);
 213   if (!DepOpts.HeaderIncludeOutputFile.empty()) {
 214     llvm::StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
 215     if (OutputPath == "-")
 216       OutputPath = "";
 217     AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/true, OutputPath);
 218   }
 219
 220   return PP;
 221 }
 222
 223 // ASTContext
 224
 225 void CompilerInstance::createASTContext() {
 226   Preprocessor &PP = getPreprocessor();
 227   Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
 228                                getTarget(), PP.getIdentifierTable(),
 229                                PP.getSelectorTable(), PP.getBuiltinInfo(),
 230                                /*size_reserve=*/ 0));
 231 }
 232
 233 // ExternalASTSource
 234
 235 void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
 236                                                   bool DisablePCHValidation,
 237                                                   bool DisableStatCache,
 238                                                  void *DeserializationListener){
 239   llvm::OwningPtr<ExternalASTSource> Source;
 240   bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
 241   Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
 242                                           DisablePCHValidation,
 243                                           DisableStatCache,
 244                                           getPreprocessor(), getASTContext(),
 245                                           DeserializationListener,
 246                                           Preamble));
 247   getASTContext().setExternalSource(Source);
 248 }
 249
 250 ExternalASTSource *
 251 CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
 252                                              const std::string &Sysroot,
 253                                              bool DisablePCHValidation,
 254                                              bool DisableStatCache,
 255                                              Preprocessor &PP,
 256                                              ASTContext &Context,
 257                                              void *DeserializationListener,
 258                                              bool Preamble) {
 259   llvm::OwningPtr<ASTReader> Reader;
 260   Reader.reset(new ASTReader(PP, &Context,
 261                              Sysroot.empty() ? 0 : Sysroot.c_str(),
 262                              DisablePCHValidation, DisableStatCache));
 263
 264   Reader->setDeserializationListener(
 265             static_cast<ASTDeserializationListener *>(DeserializationListener));
 266   switch (Reader->ReadAST(Path,
 267                           Preamble ? ASTReader::Preamble : ASTReader::PCH)) {
 268   case ASTReader::Success:
 269     // Set the predefines buffer as suggested by the PCH reader. Typically, the
 270     // predefines buffer will be empty.
 271     PP.setPredefines(Reader->getSuggestedPredefines());
 272     return Reader.take();
 273
 274   case ASTReader::Failure:
 275     // Unrecoverable failure: don't even try to process the input file.
 276     break;
 277
 278   case ASTReader::IgnorePCH:
 279     // No suitable PCH file could be found. Return an error.
 280     break;
 281   }
 282
 283   return 0;
 284 }
 285
 286 // Code Completion
 287
 288 static bool EnableCodeCompletion(Preprocessor &PP,
 289                                  const std::string &Filename,
 290                                  unsigned Line,
 291                                  unsigned Column) {
 292   // Tell the source manager to chop off the given file at a specific
 293   // line and column.
 294   const FileEntry *Entry = PP.getFileManager().getFile(Filename);
 295   if (!Entry) {
 296     PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
 297       << Filename;
 298     return true;
 299   }
 300
 301   // Truncate the named file at the given line/column.
 302   PP.SetCodeCompletionPoint(Entry, Line, Column);
 303   return false;
 304 }
 305
 306 void CompilerInstance::createCodeCompletionConsumer() {
 307   const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
 308   if (!CompletionConsumer) {
 309     CompletionConsumer.reset(
 310       createCodeCompletionConsumer(getPreprocessor(),
 311                                    Loc.FileName, Loc.Line, Loc.Column,
 312                                    getFrontendOpts().ShowMacrosInCodeCompletion,
 313                              getFrontendOpts().ShowCodePatternsInCodeCompletion,
 314                            getFrontendOpts().ShowGlobalSymbolsInCodeCompletion,
 315                                    llvm::outs()));
 316     if (!CompletionConsumer)
 317       return;
 318   } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
 319                                   Loc.Line, Loc.Column)) {
 320     CompletionConsumer.reset();
 321     return;
 322   }
 323
 324   if (CompletionConsumer->isOutputBinary() &&
 325       llvm::sys::Program::ChangeStdoutToBinary()) {
 326     getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
 327     CompletionConsumer.reset();
 328   }
 329 }
 330
 331 void CompilerInstance::createFrontendTimer() {
 332   FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
 333 }
 334
 335 CodeCompleteConsumer *
 336 CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
 337                                                const std::string &Filename,
 338                                                unsigned Line,
 339                                                unsigned Column,
 340                                                bool ShowMacros,
 341                                                bool ShowCodePatterns,
 342                                                bool ShowGlobals,
 343                                                llvm::raw_ostream &OS) {
 344   if (EnableCodeCompletion(PP, Filename, Line, Column))
 345     return 0;
 346
 347   // Set up the creation routine for code-completion.
 348   return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
 349                                           ShowGlobals, OS);
 350 }
 351
 352 void CompilerInstance::createSema(bool CompleteTranslationUnit,
 353                                   CodeCompleteConsumer *CompletionConsumer) {
 354   TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
 355                          CompleteTranslationUnit, CompletionConsumer));
 356 }
 357
 358 // Output Files
 359
 360 void CompilerInstance::addOutputFile(const OutputFile &OutFile) {
 361   assert(OutFile.OS && "Attempt to add empty stream to output list!");
 362   OutputFiles.push_back(OutFile);
 363 }
 364
 365 void CompilerInstance::clearOutputFiles(bool EraseFiles) {
 366   for (std::list<OutputFile>::iterator
 367          it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
 368     delete it->OS;
 369     if (!it->TempFilename.empty()) {
 370       llvm::sys::Path TempPath(it->TempFilename);
 371       if (EraseFiles)
 372         TempPath.eraseFromDisk();
 373       else {
 374         std::string Error;
 375         llvm::sys::Path NewOutFile(it->Filename);
 376         // If '-working-directory' was passed, the output filename should be
 377         // relative to that.
 378         FileManager::FixupRelativePath(NewOutFile, getFileSystemOpts());
 379         if (TempPath.renamePathOnDisk(NewOutFile, &Error)) {
 380           getDiagnostics().Report(diag::err_fe_unable_to_rename_temp)
 381             << it->TempFilename << it->Filename << Error;
 382           TempPath.eraseFromDisk();
 383         }
 384       }
 385     } else if (!it->Filename.empty() && EraseFiles)
 386       llvm::sys::Path(it->Filename).eraseFromDisk();
 387
 388   }
 389   OutputFiles.clear();
 390 }
 391
 392 llvm::raw_fd_ostream *
 393 CompilerInstance::createDefaultOutputFile(bool Binary,
 394                                           llvm::StringRef InFile,
 395                                           llvm::StringRef Extension) {
 396   return createOutputFile(getFrontendOpts().OutputFile, Binary,
 397                           /*RemoveFileOnSignal=*/true, InFile, Extension);
 398 }
 399
 400 llvm::raw_fd_ostream *
 401 CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
 402                                    bool Binary, bool RemoveFileOnSignal,
 403                                    llvm::StringRef InFile,
 404                                    llvm::StringRef Extension) {
 405   std::string Error, OutputPathName, TempPathName;
 406   llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
 407                                               RemoveFileOnSignal,
 408                                               InFile, Extension,
 409                                               &OutputPathName,
 410                                               &TempPathName);
 411   if (!OS) {
 412     getDiagnostics().Report(diag::err_fe_unable_to_open_output)
 413       << OutputPath << Error;
 414     return 0;
 415   }
 416
 417   // Add the output file -- but don't try to remove "-", since this means we are
 418   // using stdin.
 419   addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "",
 420                 TempPathName, OS));
 421
 422   return OS;
 423 }
 424
 425 llvm::raw_fd_ostream *
 426 CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
 427                                    std::string &Error,
 428                                    bool Binary,
 429                                    bool RemoveFileOnSignal,
 430                                    llvm::StringRef InFile,
 431                                    llvm::StringRef Extension,
 432                                    std::string *ResultPathName,
 433                                    std::string *TempPathName) {
 434   std::string OutFile, TempFile;
 435   if (!OutputPath.empty()) {
 436     OutFile = OutputPath;
 437   } else if (InFile == "-") {
 438     OutFile = "-";
 439   } else if (!Extension.empty()) {
 440     llvm::sys::Path Path(InFile);
 441     Path.eraseSuffix();
 442     Path.appendSuffix(Extension);
 443     OutFile = Path.str();
 444   } else {
 445     OutFile = "-";
 446   }
 447
 448   if (OutFile != "-") {
 449     llvm::sys::Path OutPath(OutFile);
 450     // Only create the temporary if we can actually write to OutPath, otherwise
 451     // we want to fail early.
 452     bool Exists;
 453     if ((llvm::sys::fs::exists(OutPath.str(), Exists) || !Exists) ||
 454         (OutPath.isRegularFile() && OutPath.canWrite())) {
 455       // Create a temporary file.
 456       llvm::sys::Path TempPath(OutFile);
 457       if (!TempPath.createTemporaryFileOnDisk())
 458         TempFile = TempPath.str();
 459     }
 460   }
 461
 462   std::string OSFile = OutFile;
 463   if (!TempFile.empty())
 464     OSFile = TempFile;
 465
 466   llvm::OwningPtr<llvm::raw_fd_ostream> OS(
 467     new llvm::raw_fd_ostream(OSFile.c_str(), Error,
 468                              (Binary ? llvm::raw_fd_ostream::F_Binary : 0)));
 469   if (!Error.empty())
 470     return 0;
 471
 472   // Make sure the out stream file gets removed if we crash.
 473   if (RemoveFileOnSignal)
 474     llvm::sys::RemoveFileOnSignal(llvm::sys::Path(OSFile));
 475
 476   if (ResultPathName)
 477     *ResultPathName = OutFile;
 478   if (TempPathName)
 479     *TempPathName = TempFile;
 480
 481   return OS.take();
 482 }
 483
 484 // Initialization Utilities
 485
 486 bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
 487   return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
 488                                  getSourceManager(), getFrontendOpts());
 489 }
 490
 491 bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
 492                                                Diagnostic &Diags,
 493                                                FileManager &FileMgr,
 494                                                SourceManager &SourceMgr,
 495                                                const FrontendOptions &Opts) {
 496   // Figure out where to get and map in the main file, unless it's already
 497   // been created (e.g., by a precompiled preamble).
 498   if (!SourceMgr.getMainFileID().isInvalid()) {
 499     // Do nothing: the main file has already been set.
 500   } else if (InputFile != "-") {
 501     const FileEntry *File = FileMgr.getFile(InputFile);
 502     if (!File) {
 503       Diags.Report(diag::err_fe_error_reading) << InputFile;
 504       return false;
 505     }
 506     SourceMgr.createMainFileID(File);
 507   } else {
 508     llvm::OwningPtr<llvm::MemoryBuffer> SB;
 509     if (llvm::MemoryBuffer::getSTDIN(SB)) {
 510       // FIXME: Give ec.message() in this diag.
 511       Diags.Report(diag::err_fe_error_reading_stdin);
 512       return false;
 513     }
 514     const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
 515                                                    SB->getBufferSize(), 0);
 516     SourceMgr.createMainFileID(File);
 517     SourceMgr.overrideFileContents(File, SB.take());
 518   }
 519
 520   assert(!SourceMgr.getMainFileID().isInvalid() &&
 521          "Couldn't establish MainFileID!");
 522   return true;
 523 }
 524
 525 // High-Level Operations
 526
 527 bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
 528   assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
 529   assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
 530   assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
 531
 532   // FIXME: Take this as an argument, once all the APIs we used have moved to
 533   // taking it as an input instead of hard-coding llvm::errs.
 534   llvm::raw_ostream &OS = llvm::errs();
 535
 536   // Create the target instance.
 537   setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts()));
 538   if (!hasTarget())
 539     return false;
 540
 541   // Inform the target of the language options.
 542   //
 543   // FIXME: We shouldn't need to do this, the target should be immutable once
 544   // created. This complexity should be lifted elsewhere.
 545   getTarget().setForcedLangOptions(getLangOpts());
 546
 547   // Validate/process some options.
 548   if (getHeaderSearchOpts().Verbose)
 549     OS << "clang -cc1 version " CLANG_VERSION_STRING
 550        << " based upon " << PACKAGE_STRING
 551        << " hosted on " << llvm::sys::getHostTriple() << "\n";
 552
 553   if (getFrontendOpts().ShowTimers)
 554     createFrontendTimer();
 555
 556   if (getFrontendOpts().ShowStats)
 557     llvm::EnableStatistics();
 558
 559   for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
 560     const std::string &InFile = getFrontendOpts().Inputs[i].second;
 561
 562     // Reset the ID tables if we are reusing the SourceManager.
 563     if (hasSourceManager())
 564       getSourceManager().clearIDTables();
 565
 566     if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) {
 567       Act.Execute();
 568       Act.EndSourceFile();
 569     }
 570   }
 571
 572   if (getDiagnosticOpts().ShowCarets) {
 573     // We can have multiple diagnostics sharing one diagnostic client.
 574     // Get the total number of warnings/errors from the client.
 575     unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
 576     unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
 577
 578     if (NumWarnings)
 579       OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
 580     if (NumWarnings && NumErrors)
 581       OS << " and ";
 582     if (NumErrors)
 583       OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
 584     if (NumWarnings || NumErrors)
 585       OS << " generated.\n";
 586   }
 587
 588   if (getFrontendOpts().ShowStats && hasFileManager()) {
 589     getFileManager().PrintStats();
 590     OS << "\n";
 591   }
 592
 593   return !getDiagnostics().getClient()->getNumErrors();
 594 }
 595
 596