CompilerInstance.cpp revision 69247139f5ce3edf46c48344129792b3a05d090a 
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/AST/ASTConsumer.h"
12#include "clang/AST/ASTContext.h"
13#include "clang/Basic/Diagnostic.h"
14#include "clang/Basic/FileManager.h"
15#include "clang/Basic/SourceManager.h"
16#include "clang/Basic/TargetInfo.h"
17#include "clang/Basic/Version.h"
18#include "clang/Lex/HeaderSearch.h"
19#include "clang/Lex/Preprocessor.h"
20#include "clang/Lex/PTHManager.h"
21#include "clang/Frontend/ChainedDiagnosticClient.h"
22#include "clang/Frontend/FrontendAction.h"
23#include "clang/Frontend/PCHReader.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/Sema/CodeCompleteConsumer.h"
29#include "llvm/LLVMContext.h"
30#include "llvm/Support/MemoryBuffer.h"
31#include "llvm/Support/raw_ostream.h"
32#include "llvm/Support/Timer.h"
33#include "llvm/System/Host.h"
34#include "llvm/System/Path.h"
35#include "llvm/System/Program.h"
36using namespace clang;
37
38CompilerInstance::CompilerInstance()
39  : Invocation(new CompilerInvocation()) {
40}
41
42CompilerInstance::~CompilerInstance() {
43}
44
45void CompilerInstance::setLLVMContext(llvm::LLVMContext *Value) {
46  LLVMContext.reset(Value);
47}
48
49void CompilerInstance::setInvocation(CompilerInvocation *Value) {
50  Invocation.reset(Value);
51}
52
53void CompilerInstance::setDiagnostics(Diagnostic *Value) {
54  Diagnostics.reset(Value);
55}
56
57void CompilerInstance::setDiagnosticClient(DiagnosticClient *Value) {
58  DiagClient.reset(Value);
59}
60
61void CompilerInstance::setTarget(TargetInfo *Value) {
62  Target.reset(Value);
63}
64
65void CompilerInstance::setFileManager(FileManager *Value) {
66  FileMgr.reset(Value);
67}
68
69void CompilerInstance::setSourceManager(SourceManager *Value) {
70  SourceMgr.reset(Value);
71}
72
73void CompilerInstance::setPreprocessor(Preprocessor *Value) {
74  PP.reset(Value);
75}
76
77void CompilerInstance::setASTContext(ASTContext *Value) {
78  Context.reset(Value);
79}
80
81void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
82  Consumer.reset(Value);
83}
84
85void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
86  CompletionConsumer.reset(Value);
87}
88
89// Diagnostics
90namespace {
91  class BinaryDiagnosticSerializer : public DiagnosticClient {
92    llvm::raw_ostream &OS;
93    SourceManager *SourceMgr;
94  public:
95    explicit BinaryDiagnosticSerializer(llvm::raw_ostream &OS)
96      : OS(OS), SourceMgr(0) { }
97
98    virtual void HandleDiagnostic(Diagnostic::Level DiagLevel,
99                                  const DiagnosticInfo &Info);
100  };
101}
102
103void BinaryDiagnosticSerializer::HandleDiagnostic(Diagnostic::Level DiagLevel,
104                                                  const DiagnosticInfo &Info) {
105  StoredDiagnostic(DiagLevel, Info).Serialize(OS);
106}
107
108static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts,
109                              unsigned argc, char **argv,
110                              Diagnostic &Diags) {
111  std::string ErrorInfo;
112  llvm::OwningPtr<llvm::raw_ostream> OS(
113    new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo));
114  if (!ErrorInfo.empty()) {
115    Diags.Report(diag::err_fe_unable_to_open_logfile)
116                 << DiagOpts.DumpBuildInformation << ErrorInfo;
117    return;
118  }
119
120  (*OS) << "clang -cc1 command line arguments: ";
121  for (unsigned i = 0; i != argc; ++i)
122    (*OS) << argv[i] << ' ';
123  (*OS) << '\n';
124
125  // Chain in a diagnostic client which will log the diagnostics.
126  DiagnosticClient *Logger =
127    new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true);
128  Diags.setClient(new ChainedDiagnosticClient(Diags.getClient(), Logger));
129}
130
131void CompilerInstance::createDiagnostics(int Argc, char **Argv) {
132  Diagnostics.reset(createDiagnostics(getDiagnosticOpts(), Argc, Argv));
133
134  if (Diagnostics)
135    DiagClient.reset(Diagnostics->getClient());
136}
137
138Diagnostic *CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts,
139                                                int Argc, char **Argv) {
140  llvm::OwningPtr<Diagnostic> Diags(new Diagnostic());
141
142  // Create the diagnostic client for reporting errors or for
143  // implementing -verify.
144  llvm::OwningPtr<DiagnosticClient> DiagClient;
145  if (Opts.BinaryOutput) {
146    if (llvm::sys::Program::ChangeStderrToBinary()) {
147      // We weren't able to set standard error to binary, which is a
148      // bit of a problem. So, just create a text diagnostic printer
149      // to complain about this problem, and pretend that the user
150      // didn't try to use binary output.
151      DiagClient.reset(new TextDiagnosticPrinter(llvm::errs(), Opts));
152      Diags->setClient(DiagClient.take());
153      Diags->Report(diag::err_fe_stderr_binary);
154      return Diags.take();
155    } else {
156      DiagClient.reset(new BinaryDiagnosticSerializer(llvm::errs()));
157    }
158  } else {
159    DiagClient.reset(new TextDiagnosticPrinter(llvm::errs(), Opts));
160  }
161
162  // Chain in -verify checker, if requested.
163  if (Opts.VerifyDiagnostics)
164    DiagClient.reset(new VerifyDiagnosticsClient(*Diags, DiagClient.take()));
165
166  Diags->setClient(DiagClient.take());
167  if (!Opts.DumpBuildInformation.empty())
168    SetUpBuildDumpLog(Opts, Argc, Argv, *Diags);
169
170  // Configure our handling of diagnostics.
171  ProcessWarningOptions(*Diags, Opts);
172
173  return Diags.take();
174}
175
176// File Manager
177
178void CompilerInstance::createFileManager() {
179  FileMgr.reset(new FileManager());
180}
181
182// Source Manager
183
184void CompilerInstance::createSourceManager() {
185  SourceMgr.reset(new SourceManager(getDiagnostics()));
186}
187
188// Preprocessor
189
190void CompilerInstance::createPreprocessor() {
191  PP.reset(createPreprocessor(getDiagnostics(), getLangOpts(),
192                              getPreprocessorOpts(), getHeaderSearchOpts(),
193                              getDependencyOutputOpts(), getTarget(),
194                              getFrontendOpts(), getSourceManager(),
195                              getFileManager()));
196}
197
198Preprocessor *
199CompilerInstance::createPreprocessor(Diagnostic &Diags,
200                                     const LangOptions &LangInfo,
201                                     const PreprocessorOptions &PPOpts,
202                                     const HeaderSearchOptions &HSOpts,
203                                     const DependencyOutputOptions &DepOpts,
204                                     const TargetInfo &Target,
205                                     const FrontendOptions &FEOpts,
206                                     SourceManager &SourceMgr,
207                                     FileManager &FileMgr) {
208  // Create a PTH manager if we are using some form of a token cache.
209  PTHManager *PTHMgr = 0;
210  if (!PPOpts.TokenCache.empty())
211    PTHMgr = PTHManager::Create(PPOpts.TokenCache, Diags);
212
213  // Create the Preprocessor.
214  HeaderSearch *HeaderInfo = new HeaderSearch(FileMgr);
215  Preprocessor *PP = new Preprocessor(Diags, LangInfo, Target,
216                                      SourceMgr, *HeaderInfo, PTHMgr,
217                                      /*OwnsHeaderSearch=*/true);
218
219  // Note that this is different then passing PTHMgr to Preprocessor's ctor.
220  // That argument is used as the IdentifierInfoLookup argument to
221  // IdentifierTable's ctor.
222  if (PTHMgr) {
223    PTHMgr->setPreprocessor(PP);
224    PP->setPTHManager(PTHMgr);
225  }
226
227  InitializePreprocessor(*PP, PPOpts, HSOpts, FEOpts);
228
229  // Handle generating dependencies, if requested.
230  if (!DepOpts.OutputFile.empty())
231    AttachDependencyFileGen(*PP, DepOpts);
232
233  return PP;
234}
235
236// ASTContext
237
238void CompilerInstance::createASTContext() {
239  Preprocessor &PP = getPreprocessor();
240  Context.reset(new ASTContext(getLangOpts(), PP.getSourceManager(),
241                               getTarget(), PP.getIdentifierTable(),
242                               PP.getSelectorTable(), PP.getBuiltinInfo(),
243                               /*FreeMemory=*/ !getFrontendOpts().DisableFree,
244                               /*size_reserve=*/ 0));
245}
246
247// ExternalASTSource
248
249void CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path) {
250  llvm::OwningPtr<ExternalASTSource> Source;
251  Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot,
252                                          getPreprocessor(), getASTContext()));
253  getASTContext().setExternalSource(Source);
254}
255
256ExternalASTSource *
257CompilerInstance::createPCHExternalASTSource(llvm::StringRef Path,
258                                             const std::string &Sysroot,
259                                             Preprocessor &PP,
260                                             ASTContext &Context) {
261  llvm::OwningPtr<PCHReader> Reader;
262  Reader.reset(new PCHReader(PP, &Context,
263                             Sysroot.empty() ? 0 : Sysroot.c_str()));
264
265  switch (Reader->ReadPCH(Path)) {
266  case PCHReader::Success:
267    // Set the predefines buffer as suggested by the PCH reader. Typically, the
268    // predefines buffer will be empty.
269    PP.setPredefines(Reader->getSuggestedPredefines());
270    return Reader.take();
271
272  case PCHReader::Failure:
273    // Unrecoverable failure: don't even try to process the input file.
274    break;
275
276  case PCHReader::IgnorePCH:
277    // No suitable PCH file could be found. Return an error.
278    break;
279  }
280
281  return 0;
282}
283
284// Code Completion
285
286void CompilerInstance::createCodeCompletionConsumer() {
287  const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
288  CompletionConsumer.reset(
289    createCodeCompletionConsumer(getPreprocessor(),
290                                 Loc.FileName, Loc.Line, Loc.Column,
291                                 getFrontendOpts().DebugCodeCompletionPrinter,
292                                 getFrontendOpts().ShowMacrosInCodeCompletion,
293                                 llvm::outs()));
294  if (!CompletionConsumer)
295    return;
296
297  if (CompletionConsumer->isOutputBinary() &&
298      llvm::sys::Program::ChangeStdoutToBinary()) {
299    getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
300    CompletionConsumer.reset();
301  }
302}
303
304void CompilerInstance::createFrontendTimer() {
305  FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
306}
307
308CodeCompleteConsumer *
309CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
310                                               const std::string &Filename,
311                                               unsigned Line,
312                                               unsigned Column,
313                                               bool UseDebugPrinter,
314                                               bool ShowMacros,
315                                               llvm::raw_ostream &OS) {
316  // Tell the source manager to chop off the given file at a specific
317  // line and column.
318  const FileEntry *Entry = PP.getFileManager().getFile(Filename);
319  if (!Entry) {
320    PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
321      << Filename;
322    return 0;
323  }
324
325  // Truncate the named file at the given line/column.
326  PP.SetCodeCompletionPoint(Entry, Line, Column);
327
328  // Set up the creation routine for code-completion.
329  if (UseDebugPrinter)
330    return new PrintingCodeCompleteConsumer(ShowMacros, OS);
331  else
332    return new CIndexCodeCompleteConsumer(ShowMacros, OS);
333}
334
335// Output Files
336
337void CompilerInstance::addOutputFile(llvm::StringRef Path,
338                                     llvm::raw_ostream *OS) {
339  assert(OS && "Attempt to add empty stream to output list!");
340  OutputFiles.push_back(std::make_pair(Path, OS));
341}
342
343void CompilerInstance::clearOutputFiles(bool EraseFiles) {
344  for (std::list< std::pair<std::string, llvm::raw_ostream*> >::iterator
345         it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
346    delete it->second;
347    if (EraseFiles && !it->first.empty())
348      llvm::sys::Path(it->first).eraseFromDisk();
349  }
350  OutputFiles.clear();
351}
352
353llvm::raw_fd_ostream *
354CompilerInstance::createDefaultOutputFile(bool Binary,
355                                          llvm::StringRef InFile,
356                                          llvm::StringRef Extension) {
357  return createOutputFile(getFrontendOpts().OutputFile, Binary,
358                          InFile, Extension);
359}
360
361llvm::raw_fd_ostream *
362CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
363                                   bool Binary,
364                                   llvm::StringRef InFile,
365                                   llvm::StringRef Extension) {
366  std::string Error, OutputPathName;
367  llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
368                                              InFile, Extension,
369                                              &OutputPathName);
370  if (!OS) {
371    getDiagnostics().Report(diag::err_fe_unable_to_open_output)
372      << OutputPath << Error;
373    return 0;
374  }
375
376  // Add the output file -- but don't try to remove "-", since this means we are
377  // using stdin.
378  addOutputFile((OutputPathName != "-") ? OutputPathName : "", OS);
379
380  return OS;
381}
382
383llvm::raw_fd_ostream *
384CompilerInstance::createOutputFile(llvm::StringRef OutputPath,
385                                   std::string &Error,
386                                   bool Binary,
387                                   llvm::StringRef InFile,
388                                   llvm::StringRef Extension,
389                                   std::string *ResultPathName) {
390  std::string OutFile;
391  if (!OutputPath.empty()) {
392    OutFile = OutputPath;
393  } else if (InFile == "-") {
394    OutFile = "-";
395  } else if (!Extension.empty()) {
396    llvm::sys::Path Path(InFile);
397    Path.eraseSuffix();
398    Path.appendSuffix(Extension);
399    OutFile = Path.str();
400  } else {
401    OutFile = "-";
402  }
403
404  llvm::OwningPtr<llvm::raw_fd_ostream> OS(
405    new llvm::raw_fd_ostream(OutFile.c_str(), Error,
406                             (Binary ? llvm::raw_fd_ostream::F_Binary : 0)));
407  if (!Error.empty())
408    return 0;
409
410  if (ResultPathName)
411    *ResultPathName = OutFile;
412
413  return OS.take();
414}
415
416// Initialization Utilities
417
418bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile) {
419  return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(),
420                                 getSourceManager(), getFrontendOpts());
421}
422
423bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
424                                               Diagnostic &Diags,
425                                               FileManager &FileMgr,
426                                               SourceManager &SourceMgr,
427                                               const FrontendOptions &Opts) {
428  // Figure out where to get and map in the main file.
429  if (Opts.EmptyInputOnly) {
430    const char *EmptyStr = "";
431    llvm::MemoryBuffer *SB =
432      llvm::MemoryBuffer::getMemBuffer(EmptyStr, EmptyStr, "<empty input>");
433    SourceMgr.createMainFileIDForMemBuffer(SB);
434  } else if (InputFile != "-") {
435    const FileEntry *File = FileMgr.getFile(InputFile);
436    if (File) SourceMgr.createMainFileID(File, SourceLocation());
437    if (SourceMgr.getMainFileID().isInvalid()) {
438      Diags.Report(diag::err_fe_error_reading) << InputFile;
439      return false;
440    }
441  } else {
442    llvm::MemoryBuffer *SB = llvm::MemoryBuffer::getSTDIN();
443    SourceMgr.createMainFileIDForMemBuffer(SB);
444    if (SourceMgr.getMainFileID().isInvalid()) {
445      Diags.Report(diag::err_fe_error_reading_stdin);
446      return false;
447    }
448  }
449
450  return true;
451}
452
453// High-Level Operations
454
455bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
456  assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
457  assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
458  assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
459
460  // FIXME: Take this as an argument, once all the APIs we used have moved to
461  // taking it as an input instead of hard-coding llvm::errs.
462  llvm::raw_ostream &OS = llvm::errs();
463
464  // Create the target instance.
465  setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts()));
466  if (!hasTarget())
467    return false;
468
469  // Inform the target of the language options.
470  //
471  // FIXME: We shouldn't need to do this, the target should be immutable once
472  // created. This complexity should be lifted elsewhere.
473  getTarget().setForcedLangOptions(getLangOpts());
474
475  // Validate/process some options.
476  if (getHeaderSearchOpts().Verbose)
477    OS << "clang -cc1 version " CLANG_VERSION_STRING
478       << " based upon " << PACKAGE_STRING
479       << " hosted on " << llvm::sys::getHostTriple() << "\n";
480
481  if (getFrontendOpts().ShowTimers)
482    createFrontendTimer();
483
484  for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
485    const std::string &InFile = getFrontendOpts().Inputs[i].second;
486
487    // If we aren't using an AST file, setup the file and source managers and
488    // the preprocessor.
489    bool IsAST = getFrontendOpts().Inputs[i].first == FrontendOptions::IK_AST;
490    if (!IsAST) {
491      if (!i) {
492        // Create a file manager object to provide access to and cache the
493        // filesystem.
494        createFileManager();
495
496        // Create the source manager.
497        createSourceManager();
498      } else {
499        // Reset the ID tables if we are reusing the SourceManager.
500        getSourceManager().clearIDTables();
501      }
502
503      // Create the preprocessor.
504      createPreprocessor();
505    }
506
507    if (Act.BeginSourceFile(*this, InFile, IsAST)) {
508      Act.Execute();
509      Act.EndSourceFile();
510    }
511  }
512
513  if (getDiagnosticOpts().ShowCarets)
514    if (unsigned NumDiagnostics = getDiagnostics().getNumDiagnostics())
515      OS << NumDiagnostics << " diagnostic"
516         << (NumDiagnostics == 1 ? "" : "s")
517         << " generated.\n";
518
519  if (getFrontendOpts().ShowStats) {
520    getFileManager().PrintStats();
521    OS << "\n";
522  }
523
524  // Return the appropriate status when verifying diagnostics.
525  //
526  // FIXME: If we could make getNumErrors() do the right thing, we wouldn't need
527  // this.
528  if (getDiagnosticOpts().VerifyDiagnostics)
529    return !static_cast<VerifyDiagnosticsClient&>(
530      getDiagnosticClient()).HadErrors();
531
532  return !getDiagnostics().getNumErrors();
533}
534
535
536