FrontendAction.cpp revision 7489889dd4e0fb5cd4b4176c59283da3b217f14e 
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/Lex/HeaderSearch.h"
15#include "clang/Lex/Preprocessor.h"
16#include "clang/Frontend/ASTUnit.h"
17#include "clang/Frontend/CompilerInstance.h"
18#include "clang/Frontend/FrontendDiagnostic.h"
19#include "clang/Frontend/FrontendPluginRegistry.h"
20#include "clang/Frontend/MultiplexConsumer.h"
21#include "clang/Parse/ParseAST.h"
22#include "clang/Serialization/ASTDeserializationListener.h"
23#include "clang/Serialization/ASTReader.h"
24#include "clang/Serialization/ChainedIncludesSource.h"
25#include "llvm/Support/MemoryBuffer.h"
26#include "llvm/Support/Timer.h"
27#include "llvm/Support/ErrorHandling.h"
28#include "llvm/Support/raw_ostream.h"
29using namespace clang;
30
31namespace {
32
33/// \brief Dumps deserialized declarations.
34class DeserializedDeclsDumper : public ASTDeserializationListener {
35  ASTDeserializationListener *Previous;
36
37public:
38  DeserializedDeclsDumper(ASTDeserializationListener *Previous)
39    : Previous(Previous) { }
40
41  virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
42    llvm::outs() << "PCH DECL: " << D->getDeclKindName();
43    if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
44      llvm::outs() << " - " << ND->getNameAsString();
45    llvm::outs() << "\n";
46
47    if (Previous)
48      Previous->DeclRead(ID, D);
49  }
50};
51
52  /// \brief Checks deserialized declarations and emits error if a name
53  /// matches one given in command-line using -error-on-deserialized-decl.
54  class DeserializedDeclsChecker : public ASTDeserializationListener {
55    ASTContext &Ctx;
56    std::set<std::string> NamesToCheck;
57    ASTDeserializationListener *Previous;
58
59  public:
60    DeserializedDeclsChecker(ASTContext &Ctx,
61                             const std::set<std::string> &NamesToCheck,
62                             ASTDeserializationListener *Previous)
63      : Ctx(Ctx), NamesToCheck(NamesToCheck), Previous(Previous) { }
64
65    virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
66      if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
67        if (NamesToCheck.find(ND->getNameAsString()) != NamesToCheck.end()) {
68          unsigned DiagID
69            = Ctx.getDiagnostics().getCustomDiagID(Diagnostic::Error,
70                                                   "%0 was deserialized");
71          Ctx.getDiagnostics().Report(Ctx.getFullLoc(D->getLocation()), DiagID)
72              << ND->getNameAsString();
73        }
74
75      if (Previous)
76        Previous->DeclRead(ID, D);
77    }
78};
79
80} // end anonymous namespace
81
82FrontendAction::FrontendAction() : Instance(0) {}
83
84FrontendAction::~FrontendAction() {}
85
86void FrontendAction::setCurrentFile(StringRef Value, InputKind Kind,
87                                    ASTUnit *AST) {
88  CurrentFile = Value;
89  CurrentFileKind = Kind;
90  CurrentASTUnit.reset(AST);
91}
92
93ASTConsumer* FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI,
94                                                      StringRef InFile) {
95  ASTConsumer* Consumer = CreateASTConsumer(CI, InFile);
96  if (!Consumer)
97    return 0;
98
99  if (CI.getFrontendOpts().AddPluginActions.size() == 0)
100    return Consumer;
101
102  // Make sure the non-plugin consumer is first, so that plugins can't
103  // modifiy the AST.
104  std::vector<ASTConsumer*> Consumers(1, Consumer);
105
106  for (size_t i = 0, e = CI.getFrontendOpts().AddPluginActions.size();
107       i != e; ++i) {
108    // This is O(|plugins| * |add_plugins|), but since both numbers are
109    // way below 50 in practice, that's ok.
110    for (FrontendPluginRegistry::iterator
111        it = FrontendPluginRegistry::begin(),
112        ie = FrontendPluginRegistry::end();
113        it != ie; ++it) {
114      if (it->getName() == CI.getFrontendOpts().AddPluginActions[i]) {
115        llvm::OwningPtr<PluginASTAction> P(it->instantiate());
116        FrontendAction* c = P.get();
117        if (P->ParseArgs(CI, CI.getFrontendOpts().AddPluginArgs[i]))
118          Consumers.push_back(c->CreateASTConsumer(CI, InFile));
119      }
120    }
121  }
122
123  return new MultiplexConsumer(Consumers);
124}
125
126bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
127                                     StringRef Filename,
128                                     InputKind InputKind) {
129  assert(!Instance && "Already processing a source file!");
130  assert(!Filename.empty() && "Unexpected empty filename!");
131  setCurrentFile(Filename, InputKind);
132  setCompilerInstance(&CI);
133
134  if (!BeginInvocation(CI))
135    goto failure;
136
137  // AST files follow a very different path, since they share objects via the
138  // AST unit.
139  if (InputKind == IK_AST) {
140    assert(!usesPreprocessorOnly() &&
141           "Attempt to pass AST file to preprocessor only action!");
142    assert(hasASTFileSupport() &&
143           "This action does not have AST file support!");
144
145    llvm::IntrusiveRefCntPtr<Diagnostic> Diags(&CI.getDiagnostics());
146    std::string Error;
147    ASTUnit *AST = ASTUnit::LoadFromASTFile(Filename, Diags,
148                                            CI.getFileSystemOpts());
149    if (!AST)
150      goto failure;
151
152    setCurrentFile(Filename, InputKind, AST);
153
154    // Set the shared objects, these are reset when we finish processing the
155    // file, otherwise the CompilerInstance will happily destroy them.
156    CI.setFileManager(&AST->getFileManager());
157    CI.setSourceManager(&AST->getSourceManager());
158    CI.setPreprocessor(&AST->getPreprocessor());
159    CI.setASTContext(&AST->getASTContext());
160
161    // Initialize the action.
162    if (!BeginSourceFileAction(CI, Filename))
163      goto failure;
164
165    /// Create the AST consumer.
166    CI.setASTConsumer(CreateWrappedASTConsumer(CI, Filename));
167    if (!CI.hasASTConsumer())
168      goto failure;
169
170    return true;
171  }
172
173  // Set up the file and source managers, if needed.
174  if (!CI.hasFileManager())
175    CI.createFileManager();
176  if (!CI.hasSourceManager())
177    CI.createSourceManager(CI.getFileManager());
178
179  // IR files bypass the rest of initialization.
180  if (InputKind == IK_LLVM_IR) {
181    assert(hasIRSupport() &&
182           "This action does not have IR file support!");
183
184    // Inform the diagnostic client we are processing a source file.
185    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), 0);
186
187    // Initialize the action.
188    if (!BeginSourceFileAction(CI, Filename))
189      goto failure;
190
191    return true;
192  }
193
194  // Set up the preprocessor.
195  CI.createPreprocessor();
196
197  // Inform the diagnostic client we are processing a source file.
198  CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
199                                           &CI.getPreprocessor());
200
201  // Initialize the action.
202  if (!BeginSourceFileAction(CI, Filename))
203    goto failure;
204
205  /// Create the AST context and consumer unless this is a preprocessor only
206  /// action.
207  if (!usesPreprocessorOnly()) {
208    CI.createASTContext();
209
210    llvm::OwningPtr<ASTConsumer> Consumer(
211        CreateWrappedASTConsumer(CI, Filename));
212    if (!Consumer)
213      goto failure;
214
215    CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());
216
217    if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) {
218      // Convert headers to PCH and chain them.
219      llvm::OwningPtr<ExternalASTSource> source;
220      source.reset(ChainedIncludesSource::create(CI));
221      if (!source)
222        goto failure;
223      CI.getASTContext().setExternalSource(source);
224
225    } else if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
226      // Use PCH.
227      assert(hasPCHSupport() && "This action does not have PCH support!");
228      ASTDeserializationListener *DeserialListener =
229          Consumer->GetASTDeserializationListener();
230      if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls)
231        DeserialListener = new DeserializedDeclsDumper(DeserialListener);
232      if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty())
233        DeserialListener = new DeserializedDeclsChecker(CI.getASTContext(),
234                         CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
235                                                        DeserialListener);
236      CI.createPCHExternalASTSource(
237                                CI.getPreprocessorOpts().ImplicitPCHInclude,
238                                CI.getPreprocessorOpts().DisablePCHValidation,
239                                CI.getPreprocessorOpts().DisableStatCache,
240                                DeserialListener);
241      if (!CI.getASTContext().getExternalSource())
242        goto failure;
243    }
244
245    CI.setASTConsumer(Consumer.take());
246    if (!CI.hasASTConsumer())
247      goto failure;
248  }
249
250  // Initialize built-in info as long as we aren't using an external AST
251  // source.
252  if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) {
253    Preprocessor &PP = CI.getPreprocessor();
254    PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
255                                           PP.getLangOptions());
256  }
257
258  return true;
259
260  // If we failed, reset state since the client will not end up calling the
261  // matching EndSourceFile().
262  failure:
263  if (isCurrentFileAST()) {
264    CI.setASTContext(0);
265    CI.setPreprocessor(0);
266    CI.setSourceManager(0);
267    CI.setFileManager(0);
268  }
269
270  CI.getDiagnosticClient().EndSourceFile();
271  setCurrentFile("", IK_None);
272  setCompilerInstance(0);
273  return false;
274}
275
276void FrontendAction::Execute() {
277  CompilerInstance &CI = getCompilerInstance();
278
279  // Initialize the main file entry. This needs to be delayed until after PCH
280  // has loaded.
281  if (isCurrentFileAST()) {
282    // Set the main file ID to an empty file.
283    //
284    // FIXME: We probably shouldn't need this, but for now this is the
285    // simplest way to reuse the logic in ParseAST.
286    const char *EmptyStr = "";
287    llvm::MemoryBuffer *SB =
288      llvm::MemoryBuffer::getMemBuffer(EmptyStr, "<dummy input>");
289    CI.getSourceManager().createMainFileIDForMemBuffer(SB);
290  } else {
291    if (!CI.InitializeSourceManager(getCurrentFile()))
292      return;
293  }
294
295  if (CI.hasFrontendTimer()) {
296    llvm::TimeRegion Timer(CI.getFrontendTimer());
297    ExecuteAction();
298  }
299  else ExecuteAction();
300}
301
302void FrontendAction::EndSourceFile() {
303  CompilerInstance &CI = getCompilerInstance();
304
305  // Inform the diagnostic client we are done with this source file.
306  CI.getDiagnosticClient().EndSourceFile();
307
308  // Finalize the action.
309  EndSourceFileAction();
310
311  // Release the consumer and the AST, in that order since the consumer may
312  // perform actions in its destructor which require the context.
313  //
314  // FIXME: There is more per-file stuff we could just drop here?
315  if (CI.getFrontendOpts().DisableFree) {
316    CI.takeASTConsumer();
317    if (!isCurrentFileAST()) {
318      CI.takeSema();
319      CI.resetAndLeakASTContext();
320    }
321  } else {
322    if (!isCurrentFileAST()) {
323      CI.setSema(0);
324      CI.setASTContext(0);
325    }
326    CI.setASTConsumer(0);
327  }
328
329  // Inform the preprocessor we are done.
330  if (CI.hasPreprocessor())
331    CI.getPreprocessor().EndSourceFile();
332
333  if (CI.getFrontendOpts().ShowStats) {
334    llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n";
335    CI.getPreprocessor().PrintStats();
336    CI.getPreprocessor().getIdentifierTable().PrintStats();
337    CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
338    CI.getSourceManager().PrintStats();
339    llvm::errs() << "\n";
340  }
341
342  // Cleanup the output streams, and erase the output files if we encountered
343  // an error.
344  CI.clearOutputFiles(/*EraseFiles=*/CI.getDiagnostics().hasErrorOccurred());
345
346  if (isCurrentFileAST()) {
347    CI.takeSema();
348    CI.resetAndLeakASTContext();
349    CI.resetAndLeakPreprocessor();
350    CI.resetAndLeakSourceManager();
351    CI.resetAndLeakFileManager();
352  }
353
354  setCompilerInstance(0);
355  setCurrentFile("", IK_None);
356}
357
358//===----------------------------------------------------------------------===//
359// Utility Actions
360//===----------------------------------------------------------------------===//
361
362void ASTFrontendAction::ExecuteAction() {
363  CompilerInstance &CI = getCompilerInstance();
364
365  // FIXME: Move the truncation aspect of this into Sema, we delayed this till
366  // here so the source manager would be initialized.
367  if (hasCodeCompletionSupport() &&
368      !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
369    CI.createCodeCompletionConsumer();
370
371  // Use a code completion consumer?
372  CodeCompleteConsumer *CompletionConsumer = 0;
373  if (CI.hasCodeCompletionConsumer())
374    CompletionConsumer = &CI.getCodeCompletionConsumer();
375
376  if (!CI.hasSema())
377    CI.createSema(getTranslationUnitKind(), CompletionConsumer);
378
379  ParseAST(CI.getSema(), CI.getFrontendOpts().ShowStats);
380}
381
382ASTConsumer *
383PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
384                                              StringRef InFile) {
385  llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
386}
387
388ASTConsumer *WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
389                                                      StringRef InFile) {
390  return WrappedAction->CreateASTConsumer(CI, InFile);
391}
392bool WrapperFrontendAction::BeginInvocation(CompilerInstance &CI) {
393  return WrappedAction->BeginInvocation(CI);
394}
395bool WrapperFrontendAction::BeginSourceFileAction(CompilerInstance &CI,
396                                                  StringRef Filename) {
397  WrappedAction->setCurrentFile(getCurrentFile(), getCurrentFileKind());
398  WrappedAction->setCompilerInstance(&CI);
399  return WrappedAction->BeginSourceFileAction(CI, Filename);
400}
401void WrapperFrontendAction::ExecuteAction() {
402  WrappedAction->ExecuteAction();
403}
404void WrapperFrontendAction::EndSourceFileAction() {
405  WrappedAction->EndSourceFileAction();
406}
407
408bool WrapperFrontendAction::usesPreprocessorOnly() const {
409  return WrappedAction->usesPreprocessorOnly();
410}
411TranslationUnitKind WrapperFrontendAction::getTranslationUnitKind() {
412  return WrappedAction->getTranslationUnitKind();
413}
414bool WrapperFrontendAction::hasPCHSupport() const {
415  return WrappedAction->hasPCHSupport();
416}
417bool WrapperFrontendAction::hasASTFileSupport() const {
418  return WrappedAction->hasASTFileSupport();
419}
420bool WrapperFrontendAction::hasIRSupport() const {
421  return WrappedAction->hasIRSupport();
422}
423bool WrapperFrontendAction::hasCodeCompletionSupport() const {
424  return WrappedAction->hasCodeCompletionSupport();
425}
426
427WrapperFrontendAction::WrapperFrontendAction(FrontendAction *WrappedAction)
428  : WrappedAction(WrappedAction) {}
429
430