CompilerInstance.cpp revision 93c972945bccd1a966b0445f9ed45db433b77bc1 
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/PCHReader.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"
38using namespace clang;
39
40CompilerInstance::CompilerInstance()
41  : Invocation(new CompilerInvocation()) {
42}
43
44CompilerInstance::~CompilerInstance() {
45}
46
47void CompilerInstance::setLLVMContext(llvm::LLVMContext *Value) {
48  LLVMContext.reset(Value);
49}
50
51void CompilerInstance::setInvocation(CompilerInvocation *Value) {
52  Invocation.reset(Value);
53}
54
55void CompilerInstance::setDiagnostics(Diagnostic *Value) {
56  Diagnostics = Value;
57}
58
59void CompilerInstance::setDiagnosticClient(DiagnosticClient *Value) {
60  DiagClient.reset(Value);
61}
62
63void CompilerInstance::setTarget(TargetInfo *Value) {
64  Target.reset(Value);
65}
66
67void CompilerInstance::setFileManager(FileManager *Value) {
68  FileMgr.reset(Value);
69}
70
71void CompilerInstance::setSourceManager(SourceManager *Value) {
72  SourceMgr.reset(Value);
73}
74
75void CompilerInstance::setPreprocessor(Preprocessor *Value) {
76  PP.reset(Value);
77}
78
79void CompilerInstance::setASTContext(ASTContext *Value) {
80  Context.reset(Value);
81}
82
83void CompilerInstance::setSema(Sema *S) {
84  TheSema.reset(S);
85}
86
87void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
88  Consumer.reset(Value);
89}
90
91void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
92  CompletionConsumer.reset(Value);
93}
94
95// Diagnostics
96namespace {
97  class BinaryDiagnosticSerializer : public DiagnosticClient {
98    llvm::raw_ostream &OS;
99    SourceManager *SourceMgr;
100  public:
101    explicit BinaryDiagnosticSerializer(llvm::raw_ostream &OS)
102      : OS(OS), SourceMgr(0) { }
103
104    virtual void HandleDiagnostic(Diagnostic::Level DiagLevel,
105                                  const DiagnosticInfo &Info);
106  };
107}
108
109void BinaryDiagnosticSerializer::HandleDiagnostic(Diagnostic::Level DiagLevel,
110                                                  const DiagnosticInfo &Info) {
111  StoredDiagnostic(DiagLevel, Info).Serialize(OS);
112}
113
114static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
115                              unsigned argc, char **argv,
116                              Diagnostic &Diags) {
117  std::string ErrorInfo;
118  llvm::OwningPtr<llvm::raw_ostream> OS(
119    new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo));
120  if (!ErrorInfo.empty()) {
121    Diags.Report(diag::err_fe_unable_to_open_logfile)
122                 << DiagOpts.DumpBuildInformation << ErrorInfo;
123    return;
124  }
125
126  (*OS) << "clang -cc1 command line arguments: ";
127  for (unsigned i = 0; i != argc; ++i)
128    (*OS) << argv[i] << ' ';
129  (*OS) << '\n';
130
131  // Chain in a diagnostic client which will log the diagnostics.
132  DiagnosticClient *Logger =
133    new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true);
134  Diags.setClient(new ChainedDiagnosticClient(Diags.getClient(), Logger));
135}
136
137void CompilerInstance::createDiagnostics(int Argc, char **Argv) {
138  Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv);
139
140  if (Diagnostics)
141    DiagClient.reset(Diagnostics->getClient());
142}
143
144llvm::IntrusiveRefCntPtr<Diagnostic>
145CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
146                                    int Argc, char **Argv) {
147  llvm::IntrusiveRefCntPtr<Diagnostic> Diags(new Diagnostic());
148
149  // Create the diagnostic client for reporting errors or for
150  // implementing -verify.
151  llvm::OwningPtr<DiagnosticClient> DiagClient;
152  if (Opts.BinaryOutput) {
153    if (llvm::sys::Program::ChangeStderrToBinary()) {
154      // We weren't able to set standard error to binary, which is a
155      // bit of a problem. So, just create a text diagnostic printer
156      // to complain about this problem, and pretend that the user
157      // didn't try to use binary output.
158      DiagClient.reset(new TextDiagnosticPrinter(llvm::errs(), Opts));
159      Diags->setClient(DiagClient.take());
160      Diags->Report(diag::err_fe_stderr_binary);
161      return Diags;
162    } else {
163      DiagClient.reset(new BinaryDiagnosticSerializer(llvm::errs()));
164    }
165  } else {
166    DiagClient.reset(new TextDiagnosticPrinter(llvm::errs(), Opts));
167  }
168
169  // Chain in -verify checker, if requested.
170  if (Opts.VerifyDiagnostics)
171    DiagClient.reset(new VerifyDiagnosticsClient(*Diags, DiagClient.take()));
172
173  Diags->setClient(DiagClient.take());
174  if (!Opts.DumpBuildInformation.empty())
175    SetUpBuildDumpLog(Opts, Argc, Argv, *Diags);
176
177  // Configure our handling of diagnostics.
178  ProcessWarningOptions(*Diags, Opts);
179
180  return Diags;
181}
182
183// File Manager
184
185void CompilerInstance::createFileManager() {
186  FileMgr.reset(new FileManager());
187}
188
189// Source Manager
190
191void CompilerInstance::createSourceManager() {
192  SourceMgr.reset(new SourceManager(getDiagnostics()));
193}
194
195// Preprocessor
196
197void CompilerInstance::createPreprocessor() {
198  PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
199                              getPreprocessorOpts(), getHeaderSearchOpts(),
200                              getDependencyOutputOpts(), getTarget(),
201                              getFrontendOpts(), getSourceManager(),
202                              getFileManager()));
203}
204
205Preprocessor *
206CompilerInstance::createPreprocessor(Diagnostic &Diags,
207                                     const LangOptions &LangInfo,
208                                     const PreprocessorOptions &PPOpts,
209                                     const HeaderSearchOptions &HSOpts,
210                                     const DependencyOutputOptions &DepOpts,
211                                     const TargetInfo &Target,
212                                     const FrontendOptions &FEOpts,
213                                     SourceManager &SourceMgr,
214                                     FileManager &FileMgr) {
215  // Create a PTH manager if we are using some form of a token cache.
216  PTHManager *PTHMgr = 0;
217  if (!PPOpts.TokenCache.empty())
218    PTHMgr = PTHManager::Create(PPOpts.TokenCache, Diags);
219
220  // Create the Preprocessor.
221  HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
222  Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
223                                      SourceMgr, *HeaderInfo, PTHMgr,
224                                      /*OwnsHeaderSearch=*/true);
225
226  // Note that this is different then passing PTHMgr to Preprocessor's ctor.
227  // That argument is used as the IdentifierInfoLookup argument to
228  // IdentifierTable's ctor.
229  if (PTHMgr) {
230    PTHMgr->setPreprocessor(PP);
231    PP->setPTHManager(PTHMgr);
232  }
233
234  if (PPOpts.DetailedRecord)
235    PP->createPreprocessingRecord();
236
237  InitializePreprocessor(*PP, PPOpts, HSOpts, FEOpts);
238
239  // Handle generating dependencies, if requested.
240  if (!DepOpts.OutputFile.empty())
241    AttachDependencyFileGen(*PP, DepOpts);
242
243  return PP;
244}
245
246// ASTContext
247
248void CompilerInstance::createASTContext() {
249  Preprocessor &PP = getPreprocessor();
250  Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
251                               getTarget(), PP.getIdentifierTable(),
252                               PP.getSelectorTable(), PP.getBuiltinInfo(),
253                               /*size_reserve=*/ 0));
254}
255
256// ExternalASTSource
257
258void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
259                                                  bool DisablePCHValidation,
260                                                 void *DeserializationListener){
261  llvm::OwningPtr<ExternalASTSource> Source;
262  Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
263                                          DisablePCHValidation,
264                                          getPreprocessor(), getASTContext(),
265                                          DeserializationListener));
266  getASTContext().setExternalSource(Source);
267}
268
269ExternalASTSource *
270CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
271                                             const std::string &Sysroot,
272                                             bool DisablePCHValidation,
273                                             Preprocessor &PP,
274                                             ASTContext &Context,
275                                             void *DeserializationListener) {
276  llvm::OwningPtr<PCHReader> Reader;
277  Reader.reset(new PCHReader(PP, &Context,
278                             Sysroot.empty() ? 0 : Sysroot.c_str(),
279                             DisablePCHValidation));
280
281  Reader->setDeserializationListener(
282            static_cast<PCHDeserializationListener *>(DeserializationListener));
283  switch (Reader->ReadPCH(Path)) {
284  case PCHReader::Success:
285    // Set the predefines buffer as suggested by the PCH reader. Typically, the
286    // predefines buffer will be empty.
287    PP.setPredefines(Reader->getSuggestedPredefines());
288    return Reader.take();
289
290  case PCHReader::Failure:
291    // Unrecoverable failure: don't even try to process the input file.
292    break;
293
294  case PCHReader::IgnorePCH:
295    // No suitable PCH file could be found. Return an error.
296    break;
297  }
298
299  return 0;
300}
301
302// Code Completion
303
304static bool EnableCodeCompletion(Preprocessor &PP,
305                                 const std::string &Filename,
306                                 unsigned Line,
307                                 unsigned Column) {
308  // Tell the source manager to chop off the given file at a specific
309  // line and column.
310  const FileEntry *Entry = PP.getFileManager().getFile(Filename);
311  if (!Entry) {
312    PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
313      << Filename;
314    return true;
315  }
316
317  // Truncate the named file at the given line/column.
318  PP.SetCodeCompletionPoint(Entry, Line, Column);
319  return false;
320}
321
322void CompilerInstance::createCodeCompletionConsumer() {
323  const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
324  if (!CompletionConsumer) {
325    CompletionConsumer.reset(
326      createCodeCompletionConsumer(getPreprocessor(),
327                                   Loc.FileName, Loc.Line, Loc.Column,
328                                   getFrontendOpts().DebugCodeCompletionPrinter,
329                                   getFrontendOpts().ShowMacrosInCodeCompletion,
330                             getFrontendOpts().ShowCodePatternsInCodeCompletion,
331                           getFrontendOpts().ShowGlobalSymbolsInCodeCompletion,
332                                   llvm::outs()));
333    if (!CompletionConsumer)
334      return;
335  } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
336                                  Loc.Line, Loc.Column)) {
337    CompletionConsumer.reset();
338    return;
339  }
340
341  if (CompletionConsumer->isOutputBinary() &&
342      llvm::sys::Program::ChangeStdoutToBinary()) {
343    getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
344    CompletionConsumer.reset();
345  }
346}
347
348void CompilerInstance::createFrontendTimer() {
349  FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
350}
351
352CodeCompleteConsumer *
353CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
354                                               const std::string &Filename,
355                                               unsigned Line,
356                                               unsigned Column,
357                                               bool UseDebugPrinter,
358                                               bool ShowMacros,
359                                               bool ShowCodePatterns,
360                                               bool ShowGlobals,
361                                               llvm::raw_ostream &OS) {
362  if (EnableCodeCompletion(PP, Filename, Line, Column))
363    return 0;
364
365  // Set up the creation routine for code-completion.
366  if (UseDebugPrinter)
367    return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
368                                            ShowGlobals, OS);
369  else
370    return new CIndexCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
371                                          ShowGlobals, OS);
372}
373
374void CompilerInstance::createSema(bool CompleteTranslationUnit,
375                                  CodeCompleteConsumer *CompletionConsumer) {
376  TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
377                         CompleteTranslationUnit, CompletionConsumer));
378}
379
380// Output Files
381
382void CompilerInstance::addOutputFile(llvm::StringRef Path,
383                                     llvm::raw_ostream *OS) {
384  assert(OS && "Attempt to add empty stream to output list!");
385  OutputFiles.push_back(std::make_pair(Path, OS));
386}
387
388void CompilerInstance::clearOutputFiles(bool EraseFiles) {
389  for (std::list< std::pair<std::string, llvm::raw_ostream*> >::iterator
390         it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
391    delete it->second;
392    if (EraseFiles && !it->first.empty())
393      llvm::sys::Path(it->first).eraseFromDisk();
394  }
395  OutputFiles.clear();
396}
397
398llvm::raw_fd_ostream *
399CompilerInstance::createDefaultOutputFile(bool Binary,
400                                          llvm::StringRef InFile,
401                                          llvm::StringRef Extension) {
402  return createOutputFile(getFrontendOpts().OutputFile, Binary,
403                          InFile, Extension);
404}
405
406llvm::raw_fd_ostream *
407CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
408                                   bool Binary,
409                                   llvm::StringRef InFile,
410                                   llvm::StringRef Extension) {
411  std::string Error, OutputPathName;
412  llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
413                                              InFile, Extension,
414                                              &OutputPathName);
415  if (!OS) {
416    getDiagnostics().Report(diag::err_fe_unable_to_open_output)
417      << OutputPath << Error;
418    return 0;
419  }
420
421  // Add the output file -- but don't try to remove "-", since this means we are
422  // using stdin.
423  addOutputFile((OutputPathName != "-") ? OutputPathName : "", OS);
424
425  return OS;
426}
427
428llvm::raw_fd_ostream *
429CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
430                                   std::string &Error,
431                                   bool Binary,
432                                   llvm::StringRef InFile,
433                                   llvm::StringRef Extension,
434                                   std::string *ResultPathName) {
435  std::string OutFile;
436  if (!OutputPath.empty()) {
437    OutFile = OutputPath;
438  } else if (InFile == "-") {
439    OutFile = "-";
440  } else if (!Extension.empty()) {
441    llvm::sys::Path Path(InFile);
442    Path.eraseSuffix();
443    Path.appendSuffix(Extension);
444    OutFile = Path.str();
445  } else {
446    OutFile = "-";
447  }
448
449  llvm::OwningPtr<llvm::raw_fd_ostream> OS(
450    new llvm::raw_fd_ostream(OutFile.c_str(), Error,
451                             (Binary ? llvm::raw_fd_ostream::F_Binary : 0)));
452  if (!Error.empty())
453    return 0;
454
455  if (ResultPathName)
456    *ResultPathName = OutFile;
457
458  return OS.take();
459}
460
461// Initialization Utilities
462
463bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
464  return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
465                                 getSourceManager(), getFrontendOpts());
466}
467
468bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
469                                               Diagnostic &Diags,
470                                               FileManager &FileMgr,
471                                               SourceManager &SourceMgr,
472                                               const FrontendOptions &Opts) {
473  // Figure out where to get and map in the main file.
474  if (InputFile != "-") {
475    const FileEntry *File = FileMgr.getFile(InputFile);
476    if (File) SourceMgr.createMainFileID(File, SourceLocation());
477    if (SourceMgr.getMainFileID().isInvalid()) {
478      Diags.Report(diag::err_fe_error_reading) << InputFile;
479      return false;
480    }
481  } else {
482    llvm::MemoryBuffer *SB = llvm::MemoryBuffer::getSTDIN();
483    if (SB) SourceMgr.createMainFileIDForMemBuffer(SB);
484    if (SourceMgr.getMainFileID().isInvalid()) {
485      Diags.Report(diag::err_fe_error_reading_stdin);
486      return false;
487    }
488  }
489
490  return true;
491}
492
493// High-Level Operations
494
495bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
496  assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
497  assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
498  assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
499
500  // FIXME: Take this as an argument, once all the APIs we used have moved to
501  // taking it as an input instead of hard-coding llvm::errs.
502  llvm::raw_ostream &OS = llvm::errs();
503
504  // Create the target instance.
505  setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts()));
506  if (!hasTarget())
507    return false;
508
509  // Inform the target of the language options.
510  //
511  // FIXME: We shouldn't need to do this, the target should be immutable once
512  // created. This complexity should be lifted elsewhere.
513  getTarget().setForcedLangOptions(getLangOpts());
514
515  // Validate/process some options.
516  if (getHeaderSearchOpts().Verbose)
517    OS << "clang -cc1 version " CLANG_VERSION_STRING
518       << " based upon " << PACKAGE_STRING
519       << " hosted on " << llvm::sys::getHostTriple() << "\n";
520
521  if (getFrontendOpts().ShowTimers)
522    createFrontendTimer();
523
524  if (getFrontendOpts().ShowStats)
525    llvm::EnableStatistics();
526
527  for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
528    const std::string &InFile = getFrontendOpts().Inputs[i].second;
529
530    // Reset the ID tables if we are reusing the SourceManager.
531    if (hasSourceManager())
532      getSourceManager().clearIDTables();
533
534    if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) {
535      Act.Execute();
536      Act.EndSourceFile();
537    }
538  }
539
540  if (getDiagnosticOpts().ShowCarets) {
541    unsigned NumWarnings = getDiagnostics().getNumWarnings();
542    unsigned NumErrors = getDiagnostics().getNumErrors() -
543                               getDiagnostics().getNumErrorsSuppressed();
544
545    if (NumWarnings)
546      OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
547    if (NumWarnings && NumErrors)
548      OS << " and ";
549    if (NumErrors)
550      OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
551    if (NumWarnings || NumErrors)
552      OS << " generated.\n";
553  }
554
555  if (getFrontendOpts().ShowStats && hasFileManager()) {
556    getFileManager().PrintStats();
557    OS << "\n";
558  }
559
560  // Return the appropriate status when verifying diagnostics.
561  //
562  // FIXME: If we could make getNumErrors() do the right thing, we wouldn't need
563  // this.
564  if (getDiagnosticOpts().VerifyDiagnostics)
565    return !static_cast<VerifyDiagnosticsClient&>(
566      getDiagnosticClient()).HadErrors();
567
568  return !getDiagnostics().getNumErrors();
569}
570
571
572