CompilerInstance.cpp revision e47be3e9682e82da15059006f43c7f3c021e4fff 
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/MemoryBuffer.h"
32#include "llvm/Support/raw_ostream.h"
33#include "llvm/ADT/Statistic.h"
34#include "llvm/Support/Timer.h"
35#include "llvm/System/Host.h"
36#include "llvm/System/Path.h"
37#include "llvm/System/Program.h"
38#include "llvm/System/Signals.h"
39using namespace clang;
40
41CompilerInstance::CompilerInstance()
42  : Invocation(new CompilerInvocation()) {
43}
44
45CompilerInstance::~CompilerInstance() {
46}
47
48void CompilerInstance::setLLVMContext(llvm::LLVMContext *Value) {
49  LLVMContext.reset(Value);
50}
51
52void CompilerInstance::setInvocation(CompilerInvocation *Value) {
53  Invocation.reset(Value);
54}
55
56void CompilerInstance::setDiagnostics(Diagnostic *Value) {
57  Diagnostics = Value;
58}
59
60void CompilerInstance::setTarget(TargetInfo *Value) {
61  Target.reset(Value);
62}
63
64void CompilerInstance::setFileManager(FileManager *Value) {
65  FileMgr.reset(Value);
66}
67
68void CompilerInstance::setSourceManager(SourceManager *Value) {
69  SourceMgr.reset(Value);
70}
71
72void CompilerInstance::setPreprocessor(Preprocessor *Value) {
73  PP.reset(Value);
74}
75
76void CompilerInstance::setASTContext(ASTContext *Value) {
77  Context.reset(Value);
78}
79
80void CompilerInstance::setSema(Sema *S) {
81  TheSema.reset(S);
82}
83
84void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
85  Consumer.reset(Value);
86}
87
88void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
89  CompletionConsumer.reset(Value);
90}
91
92// Diagnostics
93static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
94                              unsigned argc, const char* const *argv,
95                              Diagnostic &Diags) {
96  std::string ErrorInfo;
97  llvm::OwningPtr<llvm::raw_ostream> OS(
98    new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo));
99  if (!ErrorInfo.empty()) {
100    Diags.Report(diag::err_fe_unable_to_open_logfile)
101                 << DiagOpts.DumpBuildInformation << ErrorInfo;
102    return;
103  }
104
105  (*OS) << "clang -cc1 command line arguments: ";
106  for (unsigned i = 0; i != argc; ++i)
107    (*OS) << argv[i] << ' ';
108  (*OS) << '\n';
109
110  // Chain in a diagnostic client which will log the diagnostics.
111  DiagnosticClient *Logger =
112    new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true);
113  Diags.setClient(new ChainedDiagnosticClient(Diags.takeClient(), Logger));
114}
115
116void CompilerInstance::createDiagnostics(int Argc, const char* const *Argv,
117                                         DiagnosticClient *Client) {
118  Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv, Client);
119}
120
121llvm::IntrusiveRefCntPtr<Diagnostic>
122CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
123                                    int Argc, const char* const *Argv,
124                                    DiagnosticClient *Client) {
125  llvm::IntrusiveRefCntPtr<Diagnostic> Diags(new Diagnostic());
126
127  // Create the diagnostic client for reporting errors or for
128  // implementing -verify.
129  if (Client)
130    Diags->setClient(Client);
131  else
132    Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
133
134  // Chain in -verify checker, if requested.
135  if (Opts.VerifyDiagnostics)
136    Diags->setClient(new VerifyDiagnosticsClient(*Diags, Diags->takeClient()));
137
138  if (!Opts.DumpBuildInformation.empty())
139    SetUpBuildDumpLog(Opts, Argc, Argv, *Diags);
140
141  // Configure our handling of diagnostics.
142  ProcessWarningOptions(*Diags, Opts);
143
144  return Diags;
145}
146
147// File Manager
148
149void CompilerInstance::createFileManager() {
150  FileMgr.reset(new FileManager());
151}
152
153// Source Manager
154
155void CompilerInstance::createSourceManager(FileManager &FileMgr,
156                                           const FileSystemOptions &FSOpts) {
157  SourceMgr.reset(new SourceManager(getDiagnostics(), FileMgr, FSOpts));
158}
159
160// Preprocessor
161
162void CompilerInstance::createPreprocessor() {
163  PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
164                              getPreprocessorOpts(), getHeaderSearchOpts(),
165                              getDependencyOutputOpts(), getTarget(),
166                              getFrontendOpts(), getFileSystemOpts(),
167                              getSourceManager(), getFileManager()));
168}
169
170Preprocessor *
171CompilerInstance::createPreprocessor(Diagnostic &Diags,
172                                     const LangOptions &LangInfo,
173                                     const PreprocessorOptions &PPOpts,
174                                     const HeaderSearchOptions &HSOpts,
175                                     const DependencyOutputOptions &DepOpts,
176                                     const TargetInfo &Target,
177                                     const FrontendOptions &FEOpts,
178                                     const FileSystemOptions &FSOpts,
179                                     SourceManager &SourceMgr,
180                                     FileManager &FileMgr) {
181  // Create a PTH manager if we are using some form of a token cache.
182  PTHManager *PTHMgr = 0;
183  if (!PPOpts.TokenCache.empty())
184    PTHMgr = PTHManager::Create(PPOpts.TokenCache, FileMgr, FSOpts, Diags);
185
186  // Create the Preprocessor.
187  HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr, FSOpts);
188  Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
189                                      SourceMgr, *HeaderInfo, PTHMgr,
190                                      /*OwnsHeaderSearch=*/true);
191
192  // Note that this is different then passing PTHMgr to Preprocessor's ctor.
193  // That argument is used as the IdentifierInfoLookup argument to
194  // IdentifierTable's ctor.
195  if (PTHMgr) {
196    PTHMgr->setPreprocessor(PP);
197    PP->setPTHManager(PTHMgr);
198  }
199
200  if (PPOpts.DetailedRecord)
201    PP->createPreprocessingRecord();
202
203  InitializePreprocessor(*PP, FSOpts, PPOpts, HSOpts, FEOpts);
204
205  // Handle generating dependencies, if requested.
206  if (!DepOpts.OutputFile.empty())
207    AttachDependencyFileGen(*PP, DepOpts);
208
209  return PP;
210}
211
212// ASTContext
213
214void CompilerInstance::createASTContext() {
215  Preprocessor &PP = getPreprocessor();
216  Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
217                               getTarget(), PP.getIdentifierTable(),
218                               PP.getSelectorTable(), PP.getBuiltinInfo(),
219                               /*size_reserve=*/ 0));
220}
221
222// ExternalASTSource
223
224void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
225                                                  bool DisablePCHValidation,
226                                                 void *DeserializationListener){
227  llvm::OwningPtr<ExternalASTSource> Source;
228  bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
229  Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
230                                          DisablePCHValidation,
231                                          getPreprocessor(), getASTContext(),
232                                          DeserializationListener,
233                                          Preamble));
234  getASTContext().setExternalSource(Source);
235}
236
237ExternalASTSource *
238CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
239                                             const std::string &Sysroot,
240                                             bool DisablePCHValidation,
241                                             Preprocessor &PP,
242                                             ASTContext &Context,
243                                             void *DeserializationListener,
244                                             bool Preamble) {
245  llvm::OwningPtr<ASTReader> Reader;
246  Reader.reset(new ASTReader(PP, &Context,
247                             Sysroot.empty() ? 0 : Sysroot.c_str(),
248                             DisablePCHValidation));
249
250  Reader->setDeserializationListener(
251            static_cast<ASTDeserializationListener *>(DeserializationListener));
252  switch (Reader->ReadAST(Path,
253                          Preamble ? ASTReader::Preamble : ASTReader::PCH)) {
254  case ASTReader::Success:
255    // Set the predefines buffer as suggested by the PCH reader. Typically, the
256    // predefines buffer will be empty.
257    PP.setPredefines(Reader->getSuggestedPredefines());
258    return Reader.take();
259
260  case ASTReader::Failure:
261    // Unrecoverable failure: don't even try to process the input file.
262    break;
263
264  case ASTReader::IgnorePCH:
265    // No suitable PCH file could be found. Return an error.
266    break;
267  }
268
269  return 0;
270}
271
272// Code Completion
273
274static bool EnableCodeCompletion(Preprocessor &PP,
275                                 const std::string &Filename,
276                                 unsigned Line,
277                                 unsigned Column) {
278  // Tell the source manager to chop off the given file at a specific
279  // line and column.
280  const FileEntry *Entry = PP.getFileManager().getFile(Filename,
281                                                       PP.getFileSystemOpts());
282  if (!Entry) {
283    PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
284      << Filename;
285    return true;
286  }
287
288  // Truncate the named file at the given line/column.
289  PP.SetCodeCompletionPoint(Entry, Line, Column);
290  return false;
291}
292
293void CompilerInstance::createCodeCompletionConsumer() {
294  const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
295  if (!CompletionConsumer) {
296    CompletionConsumer.reset(
297      createCodeCompletionConsumer(getPreprocessor(),
298                                   Loc.FileName, Loc.Line, Loc.Column,
299                                   getFrontendOpts().ShowMacrosInCodeCompletion,
300                             getFrontendOpts().ShowCodePatternsInCodeCompletion,
301                           getFrontendOpts().ShowGlobalSymbolsInCodeCompletion,
302                                   llvm::outs()));
303    if (!CompletionConsumer)
304      return;
305  } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
306                                  Loc.Line, Loc.Column)) {
307    CompletionConsumer.reset();
308    return;
309  }
310
311  if (CompletionConsumer->isOutputBinary() &&
312      llvm::sys::Program::ChangeStdoutToBinary()) {
313    getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
314    CompletionConsumer.reset();
315  }
316}
317
318void CompilerInstance::createFrontendTimer() {
319  FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
320}
321
322CodeCompleteConsumer *
323CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
324                                               const std::string &Filename,
325                                               unsigned Line,
326                                               unsigned Column,
327                                               bool ShowMacros,
328                                               bool ShowCodePatterns,
329                                               bool ShowGlobals,
330                                               llvm::raw_ostream &OS) {
331  if (EnableCodeCompletion(PP, Filename, Line, Column))
332    return 0;
333
334  // Set up the creation routine for code-completion.
335  return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
336                                          ShowGlobals, OS);
337}
338
339void CompilerInstance::createSema(bool CompleteTranslationUnit,
340                                  CodeCompleteConsumer *CompletionConsumer) {
341  TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
342                         CompleteTranslationUnit, CompletionConsumer));
343}
344
345// Output Files
346
347void CompilerInstance::addOutputFile(const OutputFile &OutFile) {
348  assert(OutFile.OS && "Attempt to add empty stream to output list!");
349  OutputFiles.push_back(OutFile);
350}
351
352void CompilerInstance::clearOutputFiles(bool EraseFiles) {
353  for (std::list<OutputFile>::iterator
354         it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
355    delete it->OS;
356    if (!it->TempFilename.empty()) {
357      llvm::sys::Path TempPath(it->TempFilename);
358      if (EraseFiles)
359        TempPath.eraseFromDisk();
360      else {
361        std::string Error;
362        llvm::sys::Path NewOutFile(it->Filename);
363        // If '-working-directory' was passed, the output filename should be
364        // relative to that.
365        FileManager::FixupRelativePath(NewOutFile, getFileSystemOpts());
366        if (TempPath.renamePathOnDisk(NewOutFile, &Error)) {
367          getDiagnostics().Report(diag::err_fe_unable_to_rename_temp)
368            << it->TempFilename << it->Filename << Error;
369          TempPath.eraseFromDisk();
370        }
371      }
372    } else if (!it->Filename.empty() && EraseFiles)
373      llvm::sys::Path(it->Filename).eraseFromDisk();
374
375  }
376  OutputFiles.clear();
377}
378
379llvm::raw_fd_ostream *
380CompilerInstance::createDefaultOutputFile(bool Binary,
381                                          llvm::StringRef InFile,
382                                          llvm::StringRef Extension) {
383  return createOutputFile(getFrontendOpts().OutputFile, Binary,
384                          InFile, Extension);
385}
386
387llvm::raw_fd_ostream *
388CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
389                                   bool Binary,
390                                   llvm::StringRef InFile,
391                                   llvm::StringRef Extension) {
392  std::string Error, OutputPathName, TempPathName;
393  llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
394                                              InFile, Extension,
395                                              &OutputPathName,
396                                              &TempPathName);
397  if (!OS) {
398    getDiagnostics().Report(diag::err_fe_unable_to_open_output)
399      << OutputPath << Error;
400    return 0;
401  }
402
403  // Add the output file -- but don't try to remove "-", since this means we are
404  // using stdin.
405  addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "",
406                TempPathName, OS));
407
408  return OS;
409}
410
411llvm::raw_fd_ostream *
412CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
413                                   std::string &Error,
414                                   bool Binary,
415                                   llvm::StringRef InFile,
416                                   llvm::StringRef Extension,
417                                   std::string *ResultPathName,
418                                   std::string *TempPathName) {
419  std::string OutFile, TempFile;
420  if (!OutputPath.empty()) {
421    OutFile = OutputPath;
422  } else if (InFile == "-") {
423    OutFile = "-";
424  } else if (!Extension.empty()) {
425    llvm::sys::Path Path(InFile);
426    Path.eraseSuffix();
427    Path.appendSuffix(Extension);
428    OutFile = Path.str();
429  } else {
430    OutFile = "-";
431  }
432
433  if (OutFile != "-") {
434    llvm::sys::Path OutPath(OutFile);
435    // Only create the temporary if we can actually write to OutPath, otherwise
436    // we want to fail early.
437    if (!OutPath.exists() ||
438        (OutPath.isRegularFile() && OutPath.canWrite())) {
439      // Create a temporary file.
440      llvm::sys::Path TempPath(OutFile);
441      if (!TempPath.createTemporaryFileOnDisk())
442        TempFile = TempPath.str();
443    }
444  }
445
446  std::string OSFile = OutFile;
447  if (!TempFile.empty())
448    OSFile = TempFile;
449
450  llvm::OwningPtr<llvm::raw_fd_ostream> OS(
451    new llvm::raw_fd_ostream(OSFile.c_str(), Error,
452                             (Binary ? llvm::raw_fd_ostream::F_Binary : 0)));
453  if (!Error.empty())
454    return 0;
455
456  // Make sure the out stream file gets removed if we crash.
457  llvm::sys::RemoveFileOnSignal(llvm::sys::Path(OSFile));
458
459  if (ResultPathName)
460    *ResultPathName = OutFile;
461  if (TempPathName)
462    *TempPathName = TempFile;
463
464  return OS.take();
465}
466
467// Initialization Utilities
468
469bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
470  return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
471                                 getFileSystemOpts(),
472                                 getSourceManager(), getFrontendOpts());
473}
474
475bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
476                                               Diagnostic &Diags,
477                                               FileManager &FileMgr,
478                                               const FileSystemOptions &FSOpts,
479                                               SourceManager &SourceMgr,
480                                               const FrontendOptions &Opts) {
481  // Figure out where to get and map in the main file.
482  if (InputFile != "-") {
483    const FileEntry *File = FileMgr.getFile(InputFile, FSOpts);
484    if (!File) {
485      Diags.Report(diag::err_fe_error_reading) << InputFile;
486      return false;
487    }
488    SourceMgr.createMainFileID(File);
489  } else {
490    llvm::MemoryBuffer *SB = llvm::MemoryBuffer::getSTDIN();
491    if (!SB) {
492      Diags.Report(diag::err_fe_error_reading_stdin);
493      return false;
494    }
495    const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
496                                                   SB->getBufferSize(), 0,
497                                                   FSOpts);
498    SourceMgr.createMainFileID(File);
499    SourceMgr.overrideFileContents(File, SB);
500  }
501
502  assert(!SourceMgr.getMainFileID().isInvalid() &&
503         "Couldn't establish MainFileID!");
504  return true;
505}
506
507// High-Level Operations
508
509bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
510  assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
511  assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
512  assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
513
514  // FIXME: Take this as an argument, once all the APIs we used have moved to
515  // taking it as an input instead of hard-coding llvm::errs.
516  llvm::raw_ostream &OS = llvm::errs();
517
518  // Create the target instance.
519  setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts()));
520  if (!hasTarget())
521    return false;
522
523  // Inform the target of the language options.
524  //
525  // FIXME: We shouldn't need to do this, the target should be immutable once
526  // created. This complexity should be lifted elsewhere.
527  getTarget().setForcedLangOptions(getLangOpts());
528
529  // Validate/process some options.
530  if (getHeaderSearchOpts().Verbose)
531    OS << "clang -cc1 version " CLANG_VERSION_STRING
532       << " based upon " << PACKAGE_STRING
533       << " hosted on " << llvm::sys::getHostTriple() << "\n";
534
535  if (getFrontendOpts().ShowTimers)
536    createFrontendTimer();
537
538  if (getFrontendOpts().ShowStats)
539    llvm::EnableStatistics();
540
541  for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
542    const std::string &InFile = getFrontendOpts().Inputs[i].second;
543
544    // Reset the ID tables if we are reusing the SourceManager.
545    if (hasSourceManager())
546      getSourceManager().clearIDTables();
547
548    if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) {
549      Act.Execute();
550      Act.EndSourceFile();
551    }
552  }
553
554  if (getDiagnosticOpts().ShowCarets) {
555    unsigned NumWarnings = getDiagnostics().getNumWarnings();
556    unsigned NumErrors = getDiagnostics().getNumErrors() -
557                               getDiagnostics().getNumErrorsSuppressed();
558
559    if (NumWarnings)
560      OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
561    if (NumWarnings && NumErrors)
562      OS << " and ";
563    if (NumErrors)
564      OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
565    if (NumWarnings || NumErrors)
566      OS << " generated.\n";
567  }
568
569  if (getFrontendOpts().ShowStats && hasFileManager()) {
570    getFileManager().PrintStats();
571    OS << "\n";
572  }
573
574  // Return the appropriate status when verifying diagnostics.
575  //
576  // FIXME: If we could make getNumErrors() do the right thing, we wouldn't need
577  // this.
578  if (getDiagnosticOpts().VerifyDiagnostics)
579    return !static_cast<VerifyDiagnosticsClient&>(
580      getDiagnosticClient()).HadErrors();
581
582  return !getDiagnostics().getNumErrors();
583}
584
585
586