contrib/llvm/tools/clang/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/LogDiagnosticPrinter.h"
  26 #include "clang/Frontend/TextDiagnosticPrinter.h"
  27 #include "clang/Frontend/VerifyDiagnosticsClient.h"
  28 #include "clang/Frontend/Utils.h"
  29 #include "clang/Serialization/ASTReader.h"
  30 #include "clang/Sema/CodeCompleteConsumer.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::setInvocation(CompilerInvocation *Value) {
  51   Invocation = Value;
  52 }
  53
  54 void CompilerInstance::setDiagnostics(Diagnostic *Value) {
  55   Diagnostics = Value;
  56 }
  57
  58 void CompilerInstance::setTarget(TargetInfo *Value) {
  59   Target = Value;
  60 }
  61
  62 void CompilerInstance::setFileManager(FileManager *Value) {
  63   FileMgr = Value;
  64 }
  65
  66 void CompilerInstance::setSourceManager(SourceManager *Value) {
  67   SourceMgr = Value;
  68 }
  69
  70 void CompilerInstance::setPreprocessor(Preprocessor *Value) { PP = Value; }
  71
  72 void CompilerInstance::setASTContext(ASTContext *Value) { Context = Value; }
  73
  74 void CompilerInstance::setSema(Sema *S) {
  75   TheSema.reset(S);
  76 }
  77
  78 void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
  79   Consumer.reset(Value);
  80 }
  81
  82 void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
  83   CompletionConsumer.reset(Value);
  84 }
  85
  86 // Diagnostics
  87 static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
  88                               unsigned argc, const char* const *argv,
  89                               Diagnostic &Diags) {
  90   std::string ErrorInfo;
  91   llvm::OwningPtr<llvm::raw_ostream> OS(
  92     new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo));
  93   if (!ErrorInfo.empty()) {
  94     Diags.Report(diag::err_fe_unable_to_open_logfile)
  95                  << DiagOpts.DumpBuildInformation << ErrorInfo;
  96     return;
  97   }
  98
  99   (*OS) << "clang -cc1 command line arguments: ";
 100   for (unsigned i = 0; i != argc; ++i)
 101     (*OS) << argv[i] << ' ';
 102   (*OS) << '\n';
 103
 104   // Chain in a diagnostic client which will log the diagnostics.
 105   DiagnosticClient *Logger =
 106     new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true);
 107   Diags.setClient(new ChainedDiagnosticClient(Diags.takeClient(), Logger));
 108 }
 109
 110 static void SetUpDiagnosticLog(const DiagnosticOptions &DiagOpts,
 111                                const CodeGenOptions *CodeGenOpts,
 112                                Diagnostic &Diags) {
 113   std::string ErrorInfo;
 114   bool OwnsStream = false;
 115   llvm::raw_ostream *OS = &llvm::errs();
 116   if (DiagOpts.DiagnosticLogFile != "-") {
 117     // Create the output stream.
 118     llvm::raw_fd_ostream *FileOS(
 119       new llvm::raw_fd_ostream(DiagOpts.DiagnosticLogFile.c_str(),
 120                                ErrorInfo, llvm::raw_fd_ostream::F_Append));
 121     if (!ErrorInfo.empty()) {
 122       Diags.Report(diag::warn_fe_cc_log_diagnostics_failure)
 123         << DiagOpts.DumpBuildInformation << ErrorInfo;
 124     } else {
 125       FileOS->SetUnbuffered();
 126       FileOS->SetUseAtomicWrites(true);
 127       OS = FileOS;
 128       OwnsStream = true;
 129     }
 130   }
 131
 132   // Chain in the diagnostic client which will log the diagnostics.
 133   LogDiagnosticPrinter *Logger = new LogDiagnosticPrinter(*OS, DiagOpts,
 134                                                           OwnsStream);
 135   if (CodeGenOpts)
 136     Logger->setDwarfDebugFlags(CodeGenOpts->DwarfDebugFlags);
 137   Diags.setClient(new ChainedDiagnosticClient(Diags.takeClient(), Logger));
 138 }
 139
 140 void CompilerInstance::createDiagnostics(int Argc, const char* const *Argv,
 141                                          DiagnosticClient *Client) {
 142   Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv, Client,
 143                                   &getCodeGenOpts());
 144 }
 145
 146 llvm::IntrusiveRefCntPtr<Diagnostic>
 147 CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
 148                                     int Argc, const char* const *Argv,
 149                                     DiagnosticClient *Client,
 150                                     const CodeGenOptions *CodeGenOpts) {
 151   llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 152   llvm::IntrusiveRefCntPtr<Diagnostic> Diags(new Diagnostic(DiagID));
 153
 154   // Create the diagnostic client for reporting errors or for
 155   // implementing -verify.
 156   if (Client)
 157     Diags->setClient(Client);
 158   else
 159     Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
 160
 161   // Chain in -verify checker, if requested.
 162   if (Opts.VerifyDiagnostics)
 163     Diags->setClient(new VerifyDiagnosticsClient(*Diags, Diags->takeClient()));
 164
 165   // Chain in -diagnostic-log-file dumper, if requested.
 166   if (!Opts.DiagnosticLogFile.empty())
 167     SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags);
 168
 169   if (!Opts.DumpBuildInformation.empty())
 170     SetUpBuildDumpLog(Opts, Argc, Argv, *Diags);
 171
 172   // Configure our handling of diagnostics.
 173   ProcessWarningOptions(*Diags, Opts);
 174
 175   return Diags;
 176 }
 177
 178 // File Manager
 179
 180 void CompilerInstance::createFileManager() {
 181   FileMgr = new FileManager(getFileSystemOpts());
 182 }
 183
 184 // Source Manager
 185
 186 void CompilerInstance::createSourceManager(FileManager &FileMgr) {
 187   SourceMgr = new SourceManager(getDiagnostics(), FileMgr);
 188 }
 189
 190 // Preprocessor
 191
 192 void CompilerInstance::createPreprocessor() {
 193   PP = createPreprocessor(getDiagnostics(), getLangOpts(),
 194                           getPreprocessorOpts(), getHeaderSearchOpts(),
 195                           getDependencyOutputOpts(), getTarget(),
 196                           getFrontendOpts(), getSourceManager(),
 197                           getFileManager());
 198 }
 199
 200 Preprocessor *
 201 CompilerInstance::createPreprocessor(Diagnostic &Diags,
 202                                      const LangOptions &LangInfo,
 203                                      const PreprocessorOptions &PPOpts,
 204                                      const HeaderSearchOptions &HSOpts,
 205                                      const DependencyOutputOptions &DepOpts,
 206                                      const TargetInfo &Target,
 207                                      const FrontendOptions &FEOpts,
 208                                      SourceManager &SourceMgr,
 209                                      FileManager &FileMgr) {
 210   // Create a PTH manager if we are using some form of a token cache.
 211   PTHManager *PTHMgr = 0;
 212   if (!PPOpts.TokenCache.empty())
 213     PTHMgr = PTHManager::Create(PPOpts.TokenCache, Diags);
 214
 215   // Create the Preprocessor.
 216   HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
 217   Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
 218                                       SourceMgr, *HeaderInfo, PTHMgr,
 219                                       /*OwnsHeaderSearch=*/true);
 220
 221   // Note that this is different then passing PTHMgr to Preprocessor's ctor.
 222   // That argument is used as the IdentifierInfoLookup argument to
 223   // IdentifierTable's ctor.
 224   if (PTHMgr) {
 225     PTHMgr->setPreprocessor(PP);
 226     PP->setPTHManager(PTHMgr);
 227   }
 228
 229   if (PPOpts.DetailedRecord)
 230     PP->createPreprocessingRecord(
 231                        PPOpts.DetailedRecordIncludesNestedMacroInstantiations);
 232
 233   InitializePreprocessor(*PP, PPOpts, HSOpts, FEOpts);
 234
 235   // Handle generating dependencies, if requested.
 236   if (!DepOpts.OutputFile.empty())
 237     AttachDependencyFileGen(*PP, DepOpts);
 238
 239   // Handle generating header include information, if requested.
 240   if (DepOpts.ShowHeaderIncludes)
 241     AttachHeaderIncludeGen(*PP);
 242   if (!DepOpts.HeaderIncludeOutputFile.empty()) {
 243     llvm::StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
 244     if (OutputPath == "-")
 245       OutputPath = "";
 246     AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/true, OutputPath,
 247                            /*ShowDepth=*/false);
 248   }
 249
 250   return PP;
 251 }
 252
 253 // ASTContext
 254
 255 void CompilerInstance::createASTContext() {
 256   Preprocessor &PP = getPreprocessor();
 257   Context = new ASTContext(getLangOpts(), PP.getSourceManager(),
 258                            getTarget(), PP.getIdentifierTable(),
 259                            PP.getSelectorTable(), PP.getBuiltinInfo(),
 260                            /*size_reserve=*/ 0);
 261 }
 262
 263 // ExternalASTSource
 264
 265 void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
 266                                                   bool DisablePCHValidation,
 267                                                   bool DisableStatCache,
 268                                                  void *DeserializationListener){
 269   llvm::OwningPtr<ExternalASTSource> Source;
 270   bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
 271   Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
 272                                           DisablePCHValidation,
 273                                           DisableStatCache,
 274                                           getPreprocessor(), getASTContext(),
 275                                           DeserializationListener,
 276                                           Preamble));
 277   getASTContext().setExternalSource(Source);
 278 }
 279
 280 ExternalASTSource *
 281 CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
 282                                              const std::string &Sysroot,
 283                                              bool DisablePCHValidation,
 284                                              bool DisableStatCache,
 285                                              Preprocessor &PP,
 286                                              ASTContext &Context,
 287                                              void *DeserializationListener,
 288                                              bool Preamble) {
 289   llvm::OwningPtr<ASTReader> Reader;
 290   Reader.reset(new ASTReader(PP, &Context,
 291                              Sysroot.empty() ? 0 : Sysroot.c_str(),
 292                              DisablePCHValidation, DisableStatCache));
 293
 294   Reader->setDeserializationListener(
 295             static_cast<ASTDeserializationListener *>(DeserializationListener));
 296   switch (Reader->ReadAST(Path,
 297                           Preamble ? ASTReader::Preamble : ASTReader::PCH)) {
 298   case ASTReader::Success:
 299     // Set the predefines buffer as suggested by the PCH reader. Typically, the
 300     // predefines buffer will be empty.
 301     PP.setPredefines(Reader->getSuggestedPredefines());
 302     return Reader.take();
 303
 304   case ASTReader::Failure:
 305     // Unrecoverable failure: don't even try to process the input file.
 306     break;
 307
 308   case ASTReader::IgnorePCH:
 309     // No suitable PCH file could be found. Return an error.
 310     break;
 311   }
 312
 313   return 0;
 314 }
 315
 316 // Code Completion
 317
 318 static bool EnableCodeCompletion(Preprocessor &PP,
 319                                  const std::string &Filename,
 320                                  unsigned Line,
 321                                  unsigned Column) {
 322   // Tell the source manager to chop off the given file at a specific
 323   // line and column.
 324   const FileEntry *Entry = PP.getFileManager().getFile(Filename);
 325   if (!Entry) {
 326     PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
 327       << Filename;
 328     return true;
 329   }
 330
 331   // Truncate the named file at the given line/column.
 332   PP.SetCodeCompletionPoint(Entry, Line, Column);
 333   return false;
 334 }
 335
 336 void CompilerInstance::createCodeCompletionConsumer() {
 337   const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
 338   if (!CompletionConsumer) {
 339     CompletionConsumer.reset(
 340       createCodeCompletionConsumer(getPreprocessor(),
 341                                    Loc.FileName, Loc.Line, Loc.Column,
 342                                    getFrontendOpts().ShowMacrosInCodeCompletion,
 343                              getFrontendOpts().ShowCodePatternsInCodeCompletion,
 344                            getFrontendOpts().ShowGlobalSymbolsInCodeCompletion,
 345                                    llvm::outs()));
 346     if (!CompletionConsumer)
 347       return;
 348   } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
 349                                   Loc.Line, Loc.Column)) {
 350     CompletionConsumer.reset();
 351     return;
 352   }
 353
 354   if (CompletionConsumer->isOutputBinary() &&
 355       llvm::sys::Program::ChangeStdoutToBinary()) {
 356     getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
 357     CompletionConsumer.reset();
 358   }
 359 }
 360
 361 void CompilerInstance::createFrontendTimer() {
 362   FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
 363 }
 364
 365 CodeCompleteConsumer *
 366 CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
 367                                                const std::string &Filename,
 368                                                unsigned Line,
 369                                                unsigned Column,
 370                                                bool ShowMacros,
 371                                                bool ShowCodePatterns,
 372                                                bool ShowGlobals,
 373                                                llvm::raw_ostream &OS) {
 374   if (EnableCodeCompletion(PP, Filename, Line, Column))
 375     return 0;
 376
 377   // Set up the creation routine for code-completion.
 378   return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
 379                                           ShowGlobals, OS);
 380 }
 381
 382 void CompilerInstance::createSema(bool CompleteTranslationUnit,
 383                                   CodeCompleteConsumer *CompletionConsumer) {
 384   TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
 385                          CompleteTranslationUnit, CompletionConsumer));
 386 }
 387
 388 // Output Files
 389
 390 void CompilerInstance::addOutputFile(const OutputFile &OutFile) {
 391   assert(OutFile.OS && "Attempt to add empty stream to output list!");
 392   OutputFiles.push_back(OutFile);
 393 }
 394
 395 void CompilerInstance::clearOutputFiles(bool EraseFiles) {
 396   for (std::list<OutputFile>::iterator
 397          it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
 398     delete it->OS;
 399     if (!it->TempFilename.empty()) {
 400       if (EraseFiles) {
 401         bool existed;
 402         llvm::sys::fs::remove(it->TempFilename, existed);
 403       } else {
 404         llvm::SmallString<128> NewOutFile(it->Filename);
 405
 406         // If '-working-directory' was passed, the output filename should be
 407         // relative to that.
 408         FileMgr->FixupRelativePath(NewOutFile);
 409         if (llvm::error_code ec = llvm::sys::fs::rename(it->TempFilename,
 410                                                         NewOutFile.str())) {
 411           getDiagnostics().Report(diag::err_fe_unable_to_rename_temp)
 412             << it->TempFilename << it->Filename << ec.message();
 413
 414           bool existed;
 415           llvm::sys::fs::remove(it->TempFilename, existed);
 416         }
 417       }
 418     } else if (!it->Filename.empty() && EraseFiles)
 419       llvm::sys::Path(it->Filename).eraseFromDisk();
 420
 421   }
 422   OutputFiles.clear();
 423 }
 424
 425 llvm::raw_fd_ostream *
 426 CompilerInstance::createDefaultOutputFile(bool Binary,
 427                                           llvm::StringRef InFile,
 428                                           llvm::StringRef Extension) {
 429   return createOutputFile(getFrontendOpts().OutputFile, Binary,
 430                           /*RemoveFileOnSignal=*/true, InFile, Extension);
 431 }
 432
 433 llvm::raw_fd_ostream *
 434 CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
 435                                    bool Binary, bool RemoveFileOnSignal,
 436                                    llvm::StringRef InFile,
 437                                    llvm::StringRef Extension) {
 438   std::string Error, OutputPathName, TempPathName;
 439   llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
 440                                               RemoveFileOnSignal,
 441                                               InFile, Extension,
 442                                               &OutputPathName,
 443                                               &TempPathName);
 444   if (!OS) {
 445     getDiagnostics().Report(diag::err_fe_unable_to_open_output)
 446       << OutputPath << Error;
 447     return 0;
 448   }
 449
 450   // Add the output file -- but don't try to remove "-", since this means we are
 451   // using stdin.
 452   addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "",
 453                 TempPathName, OS));
 454
 455   return OS;
 456 }
 457
 458 llvm::raw_fd_ostream *
 459 CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
 460                                    std::string &Error,
 461                                    bool Binary,
 462                                    bool RemoveFileOnSignal,
 463                                    llvm::StringRef InFile,
 464                                    llvm::StringRef Extension,
 465                                    std::string *ResultPathName,
 466                                    std::string *TempPathName) {
 467   std::string OutFile, TempFile;
 468   if (!OutputPath.empty()) {
 469     OutFile = OutputPath;
 470   } else if (InFile == "-") {
 471     OutFile = "-";
 472   } else if (!Extension.empty()) {
 473     llvm::sys::Path Path(InFile);
 474     Path.eraseSuffix();
 475     Path.appendSuffix(Extension);
 476     OutFile = Path.str();
 477   } else {
 478     OutFile = "-";
 479   }
 480
 481   if (OutFile != "-") {
 482     llvm::sys::Path OutPath(OutFile);
 483     // Only create the temporary if we can actually write to OutPath, otherwise
 484     // we want to fail early.
 485     bool Exists;
 486     if ((llvm::sys::fs::exists(OutPath.str(), Exists) || !Exists) ||
 487         (OutPath.isRegularFile() && OutPath.canWrite())) {
 488       // Create a temporary file.
 489       llvm::sys::Path TempPath(OutFile);
 490       if (!TempPath.createTemporaryFileOnDisk())
 491         TempFile = TempPath.str();
 492     }
 493   }
 494
 495   std::string OSFile = OutFile;
 496   if (!TempFile.empty())
 497     OSFile = TempFile;
 498
 499   llvm::OwningPtr<llvm::raw_fd_ostream> OS(
 500     new llvm::raw_fd_ostream(OSFile.c_str(), Error,
 501                              (Binary ? llvm::raw_fd_ostream::F_Binary : 0)));
 502   if (!Error.empty())
 503     return 0;
 504
 505   // Make sure the out stream file gets removed if we crash.
 506   if (RemoveFileOnSignal)
 507     llvm::sys::RemoveFileOnSignal(llvm::sys::Path(OSFile));
 508
 509   if (ResultPathName)
 510     *ResultPathName = OutFile;
 511   if (TempPathName)
 512     *TempPathName = TempFile;
 513
 514   return OS.take();
 515 }
 516
 517 // Initialization Utilities
 518
 519 bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
 520   return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
 521                                  getSourceManager(), getFrontendOpts());
 522 }
 523
 524 bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
 525                                                Diagnostic &Diags,
 526                                                FileManager &FileMgr,
 527                                                SourceManager &SourceMgr,
 528                                                const FrontendOptions &Opts) {
 529   // Figure out where to get and map in the main file, unless it's already
 530   // been created (e.g., by a precompiled preamble).
 531   if (!SourceMgr.getMainFileID().isInvalid()) {
 532     // Do nothing: the main file has already been set.
 533   } else if (InputFile != "-") {
 534     const FileEntry *File = FileMgr.getFile(InputFile);
 535     if (!File) {
 536       Diags.Report(diag::err_fe_error_reading) << InputFile;
 537       return false;
 538     }
 539     SourceMgr.createMainFileID(File);
 540   } else {
 541     llvm::OwningPtr<llvm::MemoryBuffer> SB;
 542     if (llvm::MemoryBuffer::getSTDIN(SB)) {
 543       // FIXME: Give ec.message() in this diag.
 544       Diags.Report(diag::err_fe_error_reading_stdin);
 545       return false;
 546     }
 547     const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
 548                                                    SB->getBufferSize(), 0);
 549     SourceMgr.createMainFileID(File);
 550     SourceMgr.overrideFileContents(File, SB.take());
 551   }
 552
 553   assert(!SourceMgr.getMainFileID().isInvalid() &&
 554          "Couldn't establish MainFileID!");
 555   return true;
 556 }
 557
 558 // High-Level Operations
 559
 560 bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
 561   assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
 562   assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
 563   assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
 564
 565   // FIXME: Take this as an argument, once all the APIs we used have moved to
 566   // taking it as an input instead of hard-coding llvm::errs.
 567   llvm::raw_ostream &OS = llvm::errs();
 568
 569   // Create the target instance.
 570   setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts()));
 571   if (!hasTarget())
 572     return false;
 573
 574   // Inform the target of the language options.
 575   //
 576   // FIXME: We shouldn't need to do this, the target should be immutable once
 577   // created. This complexity should be lifted elsewhere.
 578   getTarget().setForcedLangOptions(getLangOpts());
 579
 580   // Validate/process some options.
 581   if (getHeaderSearchOpts().Verbose)
 582     OS << "clang -cc1 version " CLANG_VERSION_STRING
 583        << " based upon " << PACKAGE_STRING
 584        << " hosted on " << llvm::sys::getHostTriple() << "\n";
 585
 586   if (getFrontendOpts().ShowTimers)
 587     createFrontendTimer();
 588
 589   if (getFrontendOpts().ShowStats)
 590     llvm::EnableStatistics();
 591
 592   for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
 593     const std::string &InFile = getFrontendOpts().Inputs[i].second;
 594
 595     // Reset the ID tables if we are reusing the SourceManager.
 596     if (hasSourceManager())
 597       getSourceManager().clearIDTables();
 598
 599     if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) {
 600       Act.Execute();
 601       Act.EndSourceFile();
 602     }
 603   }
 604
 605   if (getDiagnosticOpts().ShowCarets) {
 606     // We can have multiple diagnostics sharing one diagnostic client.
 607     // Get the total number of warnings/errors from the client.
 608     unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
 609     unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
 610
 611     if (NumWarnings)
 612       OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
 613     if (NumWarnings && NumErrors)
 614       OS << " and ";
 615     if (NumErrors)
 616       OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
 617     if (NumWarnings || NumErrors)
 618       OS << " generated.\n";
 619   }
 620
 621   if (getFrontendOpts().ShowStats && hasFileManager()) {
 622     getFileManager().PrintStats();
 623     OS << "\n";
 624   }
 625
 626   return !getDiagnostics().getClient()->getNumErrors();
 627 }
 628
 629