FrontendAction.cpp revision 218893 
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 "llvm/Support/MemoryBuffer.h"
24#include "llvm/Support/Timer.h"
25#include "llvm/Support/ErrorHandling.h"
26#include "llvm/Support/raw_ostream.h"
27using namespace clang;
28
29namespace {
30
31/// \brief Dumps deserialized declarations.
32class DeserializedDeclsDumper : public ASTDeserializationListener {
33  ASTDeserializationListener *Previous;
34
35public:
36  DeserializedDeclsDumper(ASTDeserializationListener *Previous)
37    : Previous(Previous) { }
38
39  virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
40    llvm::outs() << "PCH DECL: " << D->getDeclKindName();
41    if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
42      llvm::outs() << " - " << ND->getNameAsString();
43    llvm::outs() << "\n";
44
45    if (Previous)
46      Previous->DeclRead(ID, D);
47  }
48};
49
50  /// \brief Checks deserialized declarations and emits error if a name
51  /// matches one given in command-line using -error-on-deserialized-decl.
52  class DeserializedDeclsChecker : public ASTDeserializationListener {
53    ASTContext &Ctx;
54    std::set<std::string> NamesToCheck;
55    ASTDeserializationListener *Previous;
56
57  public:
58    DeserializedDeclsChecker(ASTContext &Ctx,
59                             const std::set<std::string> &NamesToCheck,
60                             ASTDeserializationListener *Previous)
61      : Ctx(Ctx), NamesToCheck(NamesToCheck), Previous(Previous) { }
62
63    virtual void DeclRead(serialization::DeclID ID, const Decl *D) {
64      if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
65        if (NamesToCheck.find(ND->getNameAsString()) != NamesToCheck.end()) {
66          unsigned DiagID
67            = Ctx.getDiagnostics().getCustomDiagID(Diagnostic::Error,
68                                                   "%0 was deserialized");
69          Ctx.getDiagnostics().Report(Ctx.getFullLoc(D->getLocation()), DiagID)
70              << ND->getNameAsString();
71        }
72
73      if (Previous)
74        Previous->DeclRead(ID, D);
75    }
76};
77
78} // end anonymous namespace
79
80FrontendAction::FrontendAction() : Instance(0) {}
81
82FrontendAction::~FrontendAction() {}
83
84void FrontendAction::setCurrentFile(llvm::StringRef Value, InputKind Kind,
85                                    ASTUnit *AST) {
86  CurrentFile = Value;
87  CurrentFileKind = Kind;
88  CurrentASTUnit.reset(AST);
89}
90
91ASTConsumer* FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI,
92                                                      llvm::StringRef InFile) {
93  ASTConsumer* Consumer = CreateASTConsumer(CI, InFile);
94  if (!Consumer)
95    return 0;
96
97  if (CI.getFrontendOpts().AddPluginActions.size() == 0)
98    return Consumer;
99
100  // Make sure the non-plugin consumer is first, so that plugins can't
101  // modifiy the AST.
102  std::vector<ASTConsumer*> Consumers(1, Consumer);
103
104  for (size_t i = 0, e = CI.getFrontendOpts().AddPluginActions.size();
105       i != e; ++i) {
106    // This is O(|plugins| * |add_plugins|), but since both numbers are
107    // way below 50 in practice, that's ok.
108    for (FrontendPluginRegistry::iterator
109        it = FrontendPluginRegistry::begin(),
110        ie = FrontendPluginRegistry::end();
111        it != ie; ++it) {
112      if (it->getName() == CI.getFrontendOpts().AddPluginActions[i]) {
113        llvm::OwningPtr<PluginASTAction> P(it->instantiate());
114        FrontendAction* c = P.get();
115        if (P->ParseArgs(CI, CI.getFrontendOpts().AddPluginArgs[i]))
116          Consumers.push_back(c->CreateASTConsumer(CI, InFile));
117      }
118    }
119  }
120
121  return new MultiplexConsumer(Consumers);
122}
123
124bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
125                                     llvm::StringRef Filename,
126                                     InputKind InputKind) {
127  assert(!Instance && "Already processing a source file!");
128  assert(!Filename.empty() && "Unexpected empty filename!");
129  setCurrentFile(Filename, InputKind);
130  setCompilerInstance(&CI);
131
132  // AST files follow a very different path, since they share objects via the
133  // AST unit.
134  if (InputKind == IK_AST) {
135    assert(!usesPreprocessorOnly() &&
136           "Attempt to pass AST file to preprocessor only action!");
137    assert(hasASTFileSupport() &&
138           "This action does not have AST file support!");
139
140    llvm::IntrusiveRefCntPtr<Diagnostic> Diags(&CI.getDiagnostics());
141    std::string Error;
142    ASTUnit *AST = ASTUnit::LoadFromASTFile(Filename, Diags,
143                                            CI.getFileSystemOpts());
144    if (!AST)
145      goto failure;
146
147    setCurrentFile(Filename, InputKind, AST);
148
149    // Set the shared objects, these are reset when we finish processing the
150    // file, otherwise the CompilerInstance will happily destroy them.
151    CI.setFileManager(&AST->getFileManager());
152    CI.setSourceManager(&AST->getSourceManager());
153    CI.setPreprocessor(&AST->getPreprocessor());
154    CI.setASTContext(&AST->getASTContext());
155
156    // Initialize the action.
157    if (!BeginSourceFileAction(CI, Filename))
158      goto failure;
159
160    /// Create the AST consumer.
161    CI.setASTConsumer(CreateWrappedASTConsumer(CI, Filename));
162    if (!CI.hasASTConsumer())
163      goto failure;
164
165    return true;
166  }
167
168  // Set up the file and source managers, if needed.
169  if (!CI.hasFileManager())
170    CI.createFileManager();
171  if (!CI.hasSourceManager())
172    CI.createSourceManager(CI.getFileManager());
173
174  // IR files bypass the rest of initialization.
175  if (InputKind == IK_LLVM_IR) {
176    assert(hasIRSupport() &&
177           "This action does not have IR file support!");
178
179    // Inform the diagnostic client we are processing a source file.
180    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), 0);
181
182    // Initialize the action.
183    if (!BeginSourceFileAction(CI, Filename))
184      goto failure;
185
186    return true;
187  }
188
189  // Set up the preprocessor.
190  CI.createPreprocessor();
191
192  // Inform the diagnostic client we are processing a source file.
193  CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
194                                           &CI.getPreprocessor());
195
196  // Initialize the action.
197  if (!BeginSourceFileAction(CI, Filename))
198    goto failure;
199
200  /// Create the AST context and consumer unless this is a preprocessor only
201  /// action.
202  if (!usesPreprocessorOnly()) {
203    CI.createASTContext();
204
205    llvm::OwningPtr<ASTConsumer> Consumer(
206        CreateWrappedASTConsumer(CI, Filename));
207    if (!Consumer)
208      goto failure;
209
210    CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());
211
212    /// Use PCH?
213    if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
214      assert(hasPCHSupport() && "This action does not have PCH support!");
215      ASTDeserializationListener *DeserialListener
216          = CI.getInvocation().getFrontendOpts().ChainedPCH ?
217                  Consumer->GetASTDeserializationListener() : 0;
218      if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls)
219        DeserialListener = new DeserializedDeclsDumper(DeserialListener);
220      if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty())
221        DeserialListener = new DeserializedDeclsChecker(CI.getASTContext(),
222                         CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
223                                                        DeserialListener);
224      CI.createPCHExternalASTSource(
225                                CI.getPreprocessorOpts().ImplicitPCHInclude,
226                                CI.getPreprocessorOpts().DisablePCHValidation,
227                                CI.getPreprocessorOpts().DisableStatCache,
228                                DeserialListener);
229      if (!CI.getASTContext().getExternalSource())
230        goto failure;
231    }
232
233    CI.setASTConsumer(Consumer.take());
234    if (!CI.hasASTConsumer())
235      goto failure;
236  }
237
238  // Initialize builtin info as long as we aren't using an external AST
239  // source.
240  if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) {
241    Preprocessor &PP = CI.getPreprocessor();
242    PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
243                                           PP.getLangOptions());
244  }
245
246  return true;
247
248  // If we failed, reset state since the client will not end up calling the
249  // matching EndSourceFile().
250  failure:
251  if (isCurrentFileAST()) {
252    CI.takeASTContext();
253    CI.takePreprocessor();
254    CI.takeSourceManager();
255    CI.takeFileManager();
256  }
257
258  CI.getDiagnosticClient().EndSourceFile();
259  setCurrentFile("", IK_None);
260  setCompilerInstance(0);
261  return false;
262}
263
264void FrontendAction::Execute() {
265  CompilerInstance &CI = getCompilerInstance();
266
267  // Initialize the main file entry. This needs to be delayed until after PCH
268  // has loaded.
269  if (isCurrentFileAST()) {
270    // Set the main file ID to an empty file.
271    //
272    // FIXME: We probably shouldn't need this, but for now this is the
273    // simplest way to reuse the logic in ParseAST.
274    const char *EmptyStr = "";
275    llvm::MemoryBuffer *SB =
276      llvm::MemoryBuffer::getMemBuffer(EmptyStr, "<dummy input>");
277    CI.getSourceManager().createMainFileIDForMemBuffer(SB);
278  } else {
279    if (!CI.InitializeSourceManager(getCurrentFile()))
280      return;
281  }
282
283  if (CI.hasFrontendTimer()) {
284    llvm::TimeRegion Timer(CI.getFrontendTimer());
285    ExecuteAction();
286  }
287  else ExecuteAction();
288}
289
290void FrontendAction::EndSourceFile() {
291  CompilerInstance &CI = getCompilerInstance();
292
293  // Inform the diagnostic client we are done with this source file.
294  CI.getDiagnosticClient().EndSourceFile();
295
296  // Finalize the action.
297  EndSourceFileAction();
298
299  // Release the consumer and the AST, in that order since the consumer may
300  // perform actions in its destructor which require the context.
301  //
302  // FIXME: There is more per-file stuff we could just drop here?
303  if (CI.getFrontendOpts().DisableFree) {
304    CI.takeASTConsumer();
305    if (!isCurrentFileAST()) {
306      CI.takeSema();
307      CI.takeASTContext();
308    }
309  } else {
310    if (!isCurrentFileAST()) {
311      CI.setSema(0);
312      CI.setASTContext(0);
313    }
314    CI.setASTConsumer(0);
315  }
316
317  // Inform the preprocessor we are done.
318  if (CI.hasPreprocessor())
319    CI.getPreprocessor().EndSourceFile();
320
321  if (CI.getFrontendOpts().ShowStats) {
322    llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n";
323    CI.getPreprocessor().PrintStats();
324    CI.getPreprocessor().getIdentifierTable().PrintStats();
325    CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
326    CI.getSourceManager().PrintStats();
327    llvm::errs() << "\n";
328  }
329
330  // Cleanup the output streams, and erase the output files if we encountered
331  // an error.
332  CI.clearOutputFiles(/*EraseFiles=*/CI.getDiagnostics().hasErrorOccurred());
333
334  if (isCurrentFileAST()) {
335    CI.takeSema();
336    CI.takeASTContext();
337    CI.takePreprocessor();
338    CI.takeSourceManager();
339    CI.takeFileManager();
340  }
341
342  setCompilerInstance(0);
343  setCurrentFile("", IK_None);
344}
345
346//===----------------------------------------------------------------------===//
347// Utility Actions
348//===----------------------------------------------------------------------===//
349
350void ASTFrontendAction::ExecuteAction() {
351  CompilerInstance &CI = getCompilerInstance();
352
353  // FIXME: Move the truncation aspect of this into Sema, we delayed this till
354  // here so the source manager would be initialized.
355  if (hasCodeCompletionSupport() &&
356      !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
357    CI.createCodeCompletionConsumer();
358
359  // Use a code completion consumer?
360  CodeCompleteConsumer *CompletionConsumer = 0;
361  if (CI.hasCodeCompletionConsumer())
362    CompletionConsumer = &CI.getCodeCompletionConsumer();
363
364  if (!CI.hasSema())
365    CI.createSema(usesCompleteTranslationUnit(), CompletionConsumer);
366
367  ParseAST(CI.getSema(), CI.getFrontendOpts().ShowStats);
368}
369
370ASTConsumer *
371PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
372                                              llvm::StringRef InFile) {
373  llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
374}
375