FrontendAction.cpp revision 1f01f7c160c06f8290b4f1c203e36b242074c6b1 
1//===--- FrontendAction.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/FrontendAction.h"
11#include "clang/AST/ASTConsumer.h"
12#include "clang/AST/ASTContext.h"
13#include "clang/AST/DeclGroup.h"
14#include "clang/Frontend/ASTUnit.h"
15#include "clang/Frontend/ChainedIncludesSource.h"
16#include "clang/Frontend/CompilerInstance.h"
17#include "clang/Frontend/FrontendDiagnostic.h"
18#include "clang/Frontend/FrontendPluginRegistry.h"
19#include "clang/Frontend/LayoutOverrideSource.h"
20#include "clang/Frontend/MultiplexConsumer.h"
21#include "clang/Lex/HeaderSearch.h"
22#include "clang/Lex/Preprocessor.h"
23#include "clang/Parse/ParseAST.h"
24#include "clang/Serialization/ASTDeserializationListener.h"
25#include "clang/Serialization/ASTReader.h"
26#include "clang/Serialization/GlobalModuleIndex.h"
27#include "llvm/Support/ErrorHandling.h"
28#include "llvm/Support/FileSystem.h"
29#include "llvm/Support/MemoryBuffer.h"
30#include "llvm/Support/Timer.h"
31#include "llvm/Support/raw_ostream.h"
32#include "llvm/Support/system_error.h"
33using namespace clang;
34
35namespace {
36
37class DelegatingDeserializationListener : public ASTDeserializationListener {
38  ASTDeserializationListener *Previous;
39
40public:
41  explicit DelegatingDeserializationListener(
42                                           ASTDeserializationListener *Previous)
43    : Previous(Previous) { }
44
45  virtual void ReaderInitialized(ASTReader *Reader) {
46    if (Previous)
47      Previous->ReaderInitialized(Reader);
48  }
49  virtual void IdentifierRead(serialization::IdentID ID,
50                              IdentifierInfo *II) {
51    if (Previous)
52      Previous->IdentifierRead(ID, II);
53  }
54  virtual void TypeRead(serialization::TypeIdx Idx, QualType T) {
55    if (Previous)
56      Previous->TypeRead(Idx, T);
57  }
58  virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
59    if (Previous)
60      Previous->DeclRead(ID, D);
61  }
62  virtual void SelectorRead(serialization::SelectorID ID, Selector Sel) {
63    if (Previous)
64      Previous->SelectorRead(ID, Sel);
65  }
66  virtual void MacroDefinitionRead(serialization::PreprocessedEntityID PPID,
67                                   MacroDefinition *MD) {
68    if (Previous)
69      Previous->MacroDefinitionRead(PPID, MD);
70  }
71};
72
73/// \brief Dumps deserialized declarations.
74class DeserializedDeclsDumper : public DelegatingDeserializationListener {
75public:
76  explicit DeserializedDeclsDumper(ASTDeserializationListener *Previous)
77    : DelegatingDeserializationListener(Previous) { }
78
79  virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
80    llvm::outs() << "PCH DECL: " << D->getDeclKindName();
81    if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
82      llvm::outs() << " - " << *ND;
83    llvm::outs() << "\n";
84
85    DelegatingDeserializationListener::DeclRead(ID, D);
86  }
87};
88
89/// \brief Checks deserialized declarations and emits error if a name
90/// matches one given in command-line using -error-on-deserialized-decl.
91class DeserializedDeclsChecker : public DelegatingDeserializationListener {
92  ASTContext &Ctx;
93  std::set<std::string> NamesToCheck;
94
95public:
96  DeserializedDeclsChecker(ASTContext &Ctx,
97                           const std::set<std::string> &NamesToCheck,
98                           ASTDeserializationListener *Previous)
99    : DelegatingDeserializationListener(Previous),
100      Ctx(Ctx), NamesToCheck(NamesToCheck) { }
101
102  virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
103    if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
104      if (NamesToCheck.find(ND->getNameAsString()) != NamesToCheck.end()) {
105        unsigned DiagID
106          = Ctx.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Error,
107                                                 "%0 was deserialized");
108        Ctx.getDiagnostics().Report(Ctx.getFullLoc(D->getLocation()), DiagID)
109            << ND->getNameAsString();
110      }
111
112    DelegatingDeserializationListener::DeclRead(ID, D);
113  }
114};
115
116} // end anonymous namespace
117
118FrontendAction::FrontendAction() : Instance(0) {}
119
120FrontendAction::~FrontendAction() {}
121
122void FrontendAction::setCurrentInput(const FrontendInputFile &CurrentInput,
123                                     ASTUnit *AST) {
124  this->CurrentInput = CurrentInput;
125  CurrentASTUnit.reset(AST);
126}
127
128ASTConsumer* FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI,
129                                                      StringRef InFile) {
130  ASTConsumer* Consumer = CreateASTConsumer(CI, InFile);
131  if (!Consumer)
132    return 0;
133
134  if (CI.getFrontendOpts().AddPluginActions.size() == 0)
135    return Consumer;
136
137  // Make sure the non-plugin consumer is first, so that plugins can't
138  // modifiy the AST.
139  std::vector<ASTConsumer*> Consumers(1, Consumer);
140
141  for (size_t i = 0, e = CI.getFrontendOpts().AddPluginActions.size();
142       i != e; ++i) {
143    // This is O(|plugins| * |add_plugins|), but since both numbers are
144    // way below 50 in practice, that's ok.
145    for (FrontendPluginRegistry::iterator
146        it = FrontendPluginRegistry::begin(),
147        ie = FrontendPluginRegistry::end();
148        it != ie; ++it) {
149      if (it->getName() == CI.getFrontendOpts().AddPluginActions[i]) {
150        OwningPtr<PluginASTAction> P(it->instantiate());
151        FrontendAction* c = P.get();
152        if (P->ParseArgs(CI, CI.getFrontendOpts().AddPluginArgs[i]))
153          Consumers.push_back(c->CreateASTConsumer(CI, InFile));
154      }
155    }
156  }
157
158  return new MultiplexConsumer(Consumers);
159}
160
161
162bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
163                                     const FrontendInputFile &Input) {
164  assert(!Instance && "Already processing a source file!");
165  assert(!Input.isEmpty() && "Unexpected empty filename!");
166  setCurrentInput(Input);
167  setCompilerInstance(&CI);
168
169  StringRef InputFile = Input.getFile();
170  bool HasBegunSourceFile = false;
171  if (!BeginInvocation(CI))
172    goto failure;
173
174  // AST files follow a very different path, since they share objects via the
175  // AST unit.
176  if (Input.getKind() == IK_AST) {
177    assert(!usesPreprocessorOnly() &&
178           "Attempt to pass AST file to preprocessor only action!");
179    assert(hasASTFileSupport() &&
180           "This action does not have AST file support!");
181
182    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());
183    std::string Error;
184    ASTUnit *AST = ASTUnit::LoadFromASTFile(InputFile, Diags,
185                                            CI.getFileSystemOpts());
186    if (!AST)
187      goto failure;
188
189    setCurrentInput(Input, AST);
190
191    // Inform the diagnostic client we are processing a source file.
192    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), 0);
193    HasBegunSourceFile = true;
194
195    // Set the shared objects, these are reset when we finish processing the
196    // file, otherwise the CompilerInstance will happily destroy them.
197    CI.setFileManager(&AST->getFileManager());
198    CI.setSourceManager(&AST->getSourceManager());
199    CI.setPreprocessor(&AST->getPreprocessor());
200    CI.setASTContext(&AST->getASTContext());
201
202    // Initialize the action.
203    if (!BeginSourceFileAction(CI, InputFile))
204      goto failure;
205
206    // Create the AST consumer.
207    CI.setASTConsumer(CreateWrappedASTConsumer(CI, InputFile));
208    if (!CI.hasASTConsumer())
209      goto failure;
210
211    return true;
212  }
213
214  // Set up the file and source managers, if needed.
215  if (!CI.hasFileManager())
216    CI.createFileManager();
217  if (!CI.hasSourceManager())
218    CI.createSourceManager(CI.getFileManager());
219
220  // IR files bypass the rest of initialization.
221  if (Input.getKind() == IK_LLVM_IR) {
222    assert(hasIRSupport() &&
223           "This action does not have IR file support!");
224
225    // Inform the diagnostic client we are processing a source file.
226    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), 0);
227    HasBegunSourceFile = true;
228
229    // Initialize the action.
230    if (!BeginSourceFileAction(CI, InputFile))
231      goto failure;
232
233    return true;
234  }
235
236  // If the implicit PCH include is actually a directory, rather than
237  // a single file, search for a suitable PCH file in that directory.
238  if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
239    FileManager &FileMgr = CI.getFileManager();
240    PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
241    StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
242    if (const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude)) {
243      llvm::error_code EC;
244      SmallString<128> DirNative;
245      llvm::sys::path::native(PCHDir->getName(), DirNative);
246      bool Found = false;
247      for (llvm::sys::fs::directory_iterator Dir(DirNative.str(), EC), DirEnd;
248           Dir != DirEnd && !EC; Dir.increment(EC)) {
249        // Check whether this is an acceptable AST file.
250        if (ASTReader::isAcceptableASTFile(Dir->path(), FileMgr,
251                                           CI.getLangOpts(),
252                                           CI.getTargetOpts(),
253                                           CI.getPreprocessorOpts())) {
254          PPOpts.ImplicitPCHInclude = Dir->path();
255          Found = true;
256          break;
257        }
258      }
259
260      if (!Found) {
261        CI.getDiagnostics().Report(diag::err_fe_no_pch_in_dir) << PCHInclude;
262        return true;
263      }
264    }
265  }
266
267  // Set up the preprocessor.
268  CI.createPreprocessor();
269
270  // Inform the diagnostic client we are processing a source file.
271  CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
272                                           &CI.getPreprocessor());
273  HasBegunSourceFile = true;
274
275  // Initialize the action.
276  if (!BeginSourceFileAction(CI, InputFile))
277    goto failure;
278
279  // Create the AST context and consumer unless this is a preprocessor only
280  // action.
281  if (!usesPreprocessorOnly()) {
282    CI.createASTContext();
283
284    OwningPtr<ASTConsumer> Consumer(
285                                   CreateWrappedASTConsumer(CI, InputFile));
286    if (!Consumer)
287      goto failure;
288
289    CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());
290
291    if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) {
292      // Convert headers to PCH and chain them.
293      OwningPtr<ExternalASTSource> source;
294      source.reset(ChainedIncludesSource::create(CI));
295      if (!source)
296        goto failure;
297      CI.setModuleManager(static_cast<ASTReader*>(
298         &static_cast<ChainedIncludesSource*>(source.get())->getFinalReader()));
299      CI.getASTContext().setExternalSource(source);
300
301    } else if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
302      // Use PCH.
303      assert(hasPCHSupport() && "This action does not have PCH support!");
304      ASTDeserializationListener *DeserialListener =
305          Consumer->GetASTDeserializationListener();
306      if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls)
307        DeserialListener = new DeserializedDeclsDumper(DeserialListener);
308      if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty())
309        DeserialListener = new DeserializedDeclsChecker(CI.getASTContext(),
310                         CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
311                                                        DeserialListener);
312      CI.createPCHExternalASTSource(
313                                CI.getPreprocessorOpts().ImplicitPCHInclude,
314                                CI.getPreprocessorOpts().DisablePCHValidation,
315                            CI.getPreprocessorOpts().AllowPCHWithCompilerErrors,
316                                DeserialListener);
317      if (!CI.getASTContext().getExternalSource())
318        goto failure;
319    }
320
321    CI.setASTConsumer(Consumer.take());
322    if (!CI.hasASTConsumer())
323      goto failure;
324  }
325
326  // Initialize built-in info as long as we aren't using an external AST
327  // source.
328  if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) {
329    Preprocessor &PP = CI.getPreprocessor();
330    PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
331                                           PP.getLangOpts());
332  }
333
334  // If there is a layout overrides file, attach an external AST source that
335  // provides the layouts from that file.
336  if (!CI.getFrontendOpts().OverrideRecordLayoutsFile.empty() &&
337      CI.hasASTContext() && !CI.getASTContext().getExternalSource()) {
338    OwningPtr<ExternalASTSource>
339      Override(new LayoutOverrideSource(
340                     CI.getFrontendOpts().OverrideRecordLayoutsFile));
341    CI.getASTContext().setExternalSource(Override);
342  }
343
344  return true;
345
346  // If we failed, reset state since the client will not end up calling the
347  // matching EndSourceFile().
348  failure:
349  if (isCurrentFileAST()) {
350    CI.setASTContext(0);
351    CI.setPreprocessor(0);
352    CI.setSourceManager(0);
353    CI.setFileManager(0);
354  }
355
356  if (HasBegunSourceFile)
357    CI.getDiagnosticClient().EndSourceFile();
358  CI.clearOutputFiles(/*EraseFiles=*/true);
359  setCurrentInput(FrontendInputFile());
360  setCompilerInstance(0);
361  return false;
362}
363
364bool FrontendAction::Execute() {
365  CompilerInstance &CI = getCompilerInstance();
366
367  // Initialize the main file entry. This needs to be delayed until after PCH
368  // has loaded.
369  if (!isCurrentFileAST()) {
370    if (!CI.InitializeSourceManager(getCurrentInput()))
371      return false;
372  }
373
374  if (CI.hasFrontendTimer()) {
375    llvm::TimeRegion Timer(CI.getFrontendTimer());
376    ExecuteAction();
377  }
378  else ExecuteAction();
379
380  // If we are supposed to rebuild the global module index, do so now unless
381  // there were any module-build failures.
382  if (CI.shouldBuildGlobalModuleIndex() && CI.hasFileManager() &&
383      CI.hasPreprocessor()) {
384    GlobalModuleIndex::writeIndex(
385      CI.getFileManager(),
386      CI.getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
387  }
388
389  return true;
390}
391
392void FrontendAction::EndSourceFile() {
393  CompilerInstance &CI = getCompilerInstance();
394
395  // Inform the diagnostic client we are done with this source file.
396  CI.getDiagnosticClient().EndSourceFile();
397
398  // Finalize the action.
399  EndSourceFileAction();
400
401  // Release the consumer and the AST, in that order since the consumer may
402  // perform actions in its destructor which require the context.
403  //
404  // FIXME: There is more per-file stuff we could just drop here?
405  if (CI.getFrontendOpts().DisableFree) {
406    CI.takeASTConsumer();
407    if (!isCurrentFileAST()) {
408      CI.takeSema();
409      CI.resetAndLeakASTContext();
410    }
411  } else {
412    if (!isCurrentFileAST()) {
413      CI.setSema(0);
414      CI.setASTContext(0);
415    }
416    CI.setASTConsumer(0);
417  }
418
419  // Inform the preprocessor we are done.
420  if (CI.hasPreprocessor())
421    CI.getPreprocessor().EndSourceFile();
422
423  if (CI.getFrontendOpts().ShowStats) {
424    llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n";
425    CI.getPreprocessor().PrintStats();
426    CI.getPreprocessor().getIdentifierTable().PrintStats();
427    CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
428    CI.getSourceManager().PrintStats();
429    llvm::errs() << "\n";
430  }
431
432  // Cleanup the output streams, and erase the output files if instructed by the
433  // FrontendAction.
434  CI.clearOutputFiles(/*EraseFiles=*/shouldEraseOutputFiles());
435
436  if (isCurrentFileAST()) {
437    CI.takeSema();
438    CI.resetAndLeakASTContext();
439    CI.resetAndLeakPreprocessor();
440    CI.resetAndLeakSourceManager();
441    CI.resetAndLeakFileManager();
442  }
443
444  setCompilerInstance(0);
445  setCurrentInput(FrontendInputFile());
446}
447
448bool FrontendAction::shouldEraseOutputFiles() {
449  return getCompilerInstance().getDiagnostics().hasErrorOccurred();
450}
451
452//===----------------------------------------------------------------------===//
453// Utility Actions
454//===----------------------------------------------------------------------===//
455
456void ASTFrontendAction::ExecuteAction() {
457  CompilerInstance &CI = getCompilerInstance();
458
459  // FIXME: Move the truncation aspect of this into Sema, we delayed this till
460  // here so the source manager would be initialized.
461  if (hasCodeCompletionSupport() &&
462      !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
463    CI.createCodeCompletionConsumer();
464
465  // Use a code completion consumer?
466  CodeCompleteConsumer *CompletionConsumer = 0;
467  if (CI.hasCodeCompletionConsumer())
468    CompletionConsumer = &CI.getCodeCompletionConsumer();
469
470  if (!CI.hasSema())
471    CI.createSema(getTranslationUnitKind(), CompletionConsumer);
472
473  ParseAST(CI.getSema(), CI.getFrontendOpts().ShowStats,
474           CI.getFrontendOpts().SkipFunctionBodies);
475}
476
477void PluginASTAction::anchor() { }
478
479ASTConsumer *
480PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
481                                              StringRef InFile) {
482  llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
483}
484
485ASTConsumer *WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
486                                                      StringRef InFile) {
487  return WrappedAction->CreateASTConsumer(CI, InFile);
488}
489bool WrapperFrontendAction::BeginInvocation(CompilerInstance &CI) {
490  return WrappedAction->BeginInvocation(CI);
491}
492bool WrapperFrontendAction::BeginSourceFileAction(CompilerInstance &CI,
493                                                  StringRef Filename) {
494  WrappedAction->setCurrentInput(getCurrentInput());
495  WrappedAction->setCompilerInstance(&CI);
496  return WrappedAction->BeginSourceFileAction(CI, Filename);
497}
498void WrapperFrontendAction::ExecuteAction() {
499  WrappedAction->ExecuteAction();
500}
501void WrapperFrontendAction::EndSourceFileAction() {
502  WrappedAction->EndSourceFileAction();
503}
504
505bool WrapperFrontendAction::usesPreprocessorOnly() const {
506  return WrappedAction->usesPreprocessorOnly();
507}
508TranslationUnitKind WrapperFrontendAction::getTranslationUnitKind() {
509  return WrappedAction->getTranslationUnitKind();
510}
511bool WrapperFrontendAction::hasPCHSupport() const {
512  return WrappedAction->hasPCHSupport();
513}
514bool WrapperFrontendAction::hasASTFileSupport() const {
515  return WrappedAction->hasASTFileSupport();
516}
517bool WrapperFrontendAction::hasIRSupport() const {
518  return WrappedAction->hasIRSupport();
519}
520bool WrapperFrontendAction::hasCodeCompletionSupport() const {
521  return WrappedAction->hasCodeCompletionSupport();
522}
523
524WrapperFrontendAction::WrapperFrontendAction(FrontendAction *WrappedAction)
525  : WrappedAction(WrappedAction) {}
526
527