CompilerInstance.cpp revision dca8ee8b7bc86076916a3a80f553f7a4e98c14af 
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"
41using namespace clang;
42
43CompilerInstance::CompilerInstance()
44  : Invocation(new CompilerInvocation()) {
45}
46
47CompilerInstance::~CompilerInstance() {
48}
49
50void CompilerInstance::setInvocation(CompilerInvocation *Value) {
51  Invocation = Value;
52}
53
54void CompilerInstance::setDiagnostics(Diagnostic *Value) {
55  Diagnostics = Value;
56}
57
58void CompilerInstance::setTarget(TargetInfo *Value) {
59  Target = Value;
60}
61
62void CompilerInstance::setFileManager(FileManager *Value) {
63  FileMgr = Value;
64}
65
66void CompilerInstance::setSourceManager(SourceManager *Value) {
67  SourceMgr = Value;
68}
69
70void CompilerInstance::setPreprocessor(Preprocessor *Value) { PP = Value; }
71
72void CompilerInstance::setASTContext(ASTContext *Value) { Context = Value; }
73
74void CompilerInstance::setSema(Sema *S) {
75  TheSema.reset(S);
76}
77
78void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
79  Consumer.reset(Value);
80}
81
82void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
83  CompletionConsumer.reset(Value);
84}
85
86// Diagnostics
87static 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
110static 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
140void CompilerInstance::createDiagnostics(int Argc, const char* const *Argv,
141                                         DiagnosticClient *Client) {
142  Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv, Client,
143                                  &getCodeGenOpts());
144}
145
146llvm::IntrusiveRefCntPtr<Diagnostic>
147CompilerInstance::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
180void CompilerInstance::createFileManager() {
181  FileMgr = new FileManager(getFileSystemOpts());
182}
183
184// Source Manager
185
186void CompilerInstance::createSourceManager(FileManager &FileMgr) {
187  SourceMgr = new SourceManager(getDiagnostics(), FileMgr);
188}
189
190// Preprocessor
191
192void CompilerInstance::createPreprocessor() {
193  PP = createPreprocessor(getDiagnostics(), getLangOpts(),
194                          getPreprocessorOpts(), getHeaderSearchOpts(),
195                          getDependencyOutputOpts(), getTarget(),
196                          getFrontendOpts(), getSourceManager(),
197                          getFileManager());
198}
199
200Preprocessor *
201CompilerInstance::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
255void 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
265void 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
280ExternalASTSource *
281CompilerInstance::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
318static 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
336void 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
361void CompilerInstance::createFrontendTimer() {
362  FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
363}
364
365CodeCompleteConsumer *
366CompilerInstance::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
382void CompilerInstance::createSema(bool CompleteTranslationUnit,
383                                  CodeCompleteConsumer *CompletionConsumer) {
384  TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
385                         CompleteTranslationUnit, CompletionConsumer));
386}
387
388// Output Files
389
390void CompilerInstance::addOutputFile(const OutputFile &OutFile) {
391  assert(OutFile.OS && "Attempt to add empty stream to output list!");
392  OutputFiles.push_back(OutFile);
393}
394
395void 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
425llvm::raw_fd_ostream *
426CompilerInstance::createDefaultOutputFile(bool Binary,
427                                          llvm::StringRef InFile,
428                                          llvm::StringRef Extension) {
429  return createOutputFile(getFrontendOpts().OutputFile, Binary,
430                          /*RemoveFileOnSignal=*/true, InFile, Extension);
431}
432
433llvm::raw_fd_ostream *
434CompilerInstance::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
458llvm::raw_fd_ostream *
459CompilerInstance::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
519bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
520  return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
521                                 getSourceManager(), getFrontendOpts());
522}
523
524bool 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
560bool 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
630