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      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/CompilerInstance.h"
     16 #include "clang/Frontend/FrontendDiagnostic.h"
     17 #include "clang/Frontend/FrontendPluginRegistry.h"
     18 #include "clang/Frontend/LayoutOverrideSource.h"
     19 #include "clang/Frontend/MultiplexConsumer.h"
     20 #include "clang/Frontend/Utils.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 <system_error>
     33 using namespace clang;
     34 
     35 template class llvm::Registry<clang::PluginASTAction>;
     36 
     37 namespace {
     38 
     39 class DelegatingDeserializationListener : public ASTDeserializationListener {
     40   ASTDeserializationListener *Previous;
     41   bool DeletePrevious;
     42 
     43 public:
     44   explicit DelegatingDeserializationListener(
     45       ASTDeserializationListener *Previous, bool DeletePrevious)
     46       : Previous(Previous), DeletePrevious(DeletePrevious) {}
     47   ~DelegatingDeserializationListener() override {
     48     if (DeletePrevious)
     49       delete Previous;
     50   }
     51 
     52   void ReaderInitialized(ASTReader *Reader) override {
     53     if (Previous)
     54       Previous->ReaderInitialized(Reader);
     55   }
     56   void IdentifierRead(serialization::IdentID ID,
     57                       IdentifierInfo *II) override {
     58     if (Previous)
     59       Previous->IdentifierRead(ID, II);
     60   }
     61   void TypeRead(serialization::TypeIdx Idx, QualType T) override {
     62     if (Previous)
     63       Previous->TypeRead(Idx, T);
     64   }
     65   void DeclRead(serialization::DeclID ID, const Decl *D) override {
     66     if (Previous)
     67       Previous->DeclRead(ID, D);
     68   }
     69   void SelectorRead(serialization::SelectorID ID, Selector Sel) override {
     70     if (Previous)
     71       Previous->SelectorRead(ID, Sel);
     72   }
     73   void MacroDefinitionRead(serialization::PreprocessedEntityID PPID,
     74                            MacroDefinitionRecord *MD) override {
     75     if (Previous)
     76       Previous->MacroDefinitionRead(PPID, MD);
     77   }
     78 };
     79 
     80 /// \brief Dumps deserialized declarations.
     81 class DeserializedDeclsDumper : public DelegatingDeserializationListener {
     82 public:
     83   explicit DeserializedDeclsDumper(ASTDeserializationListener *Previous,
     84                                    bool DeletePrevious)
     85       : DelegatingDeserializationListener(Previous, DeletePrevious) {}
     86 
     87   void DeclRead(serialization::DeclID ID, const Decl *D) override {
     88     llvm::outs() << "PCH DECL: " << D->getDeclKindName();
     89     if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
     90       llvm::outs() << " - " << *ND;
     91     llvm::outs() << "\n";
     92 
     93     DelegatingDeserializationListener::DeclRead(ID, D);
     94   }
     95 };
     96 
     97 /// \brief Checks deserialized declarations and emits error if a name
     98 /// matches one given in command-line using -error-on-deserialized-decl.
     99 class DeserializedDeclsChecker : public DelegatingDeserializationListener {
    100   ASTContext &Ctx;
    101   std::set<std::string> NamesToCheck;
    102 
    103 public:
    104   DeserializedDeclsChecker(ASTContext &Ctx,
    105                            const std::set<std::string> &NamesToCheck,
    106                            ASTDeserializationListener *Previous,
    107                            bool DeletePrevious)
    108       : DelegatingDeserializationListener(Previous, DeletePrevious), Ctx(Ctx),
    109         NamesToCheck(NamesToCheck) {}
    110 
    111   void DeclRead(serialization::DeclID ID, const Decl *D) override {
    112     if (const NamedDecl *ND = dyn_cast<NamedDecl>(D))
    113       if (NamesToCheck.find(ND->getNameAsString()) != NamesToCheck.end()) {
    114         unsigned DiagID
    115           = Ctx.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Error,
    116                                                  "%0 was deserialized");
    117         Ctx.getDiagnostics().Report(Ctx.getFullLoc(D->getLocation()), DiagID)
    118             << ND->getNameAsString();
    119       }
    120 
    121     DelegatingDeserializationListener::DeclRead(ID, D);
    122   }
    123 };
    124 
    125 } // end anonymous namespace
    126 
    127 FrontendAction::FrontendAction() : Instance(nullptr) {}
    128 
    129 FrontendAction::~FrontendAction() {}
    130 
    131 void FrontendAction::setCurrentInput(const FrontendInputFile &CurrentInput,
    132                                      std::unique_ptr<ASTUnit> AST) {
    133   this->CurrentInput = CurrentInput;
    134   CurrentASTUnit = std::move(AST);
    135 }
    136 
    137 std::unique_ptr<ASTConsumer>
    138 FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI,
    139                                          StringRef InFile) {
    140   std::unique_ptr<ASTConsumer> Consumer = CreateASTConsumer(CI, InFile);
    141   if (!Consumer)
    142     return nullptr;
    143 
    144   // If there are no registered plugins we don't need to wrap the consumer
    145   if (FrontendPluginRegistry::begin() == FrontendPluginRegistry::end())
    146     return Consumer;
    147 
    148   // Collect the list of plugins that go before the main action (in Consumers)
    149   // or after it (in AfterConsumers)
    150   std::vector<std::unique_ptr<ASTConsumer>> Consumers;
    151   std::vector<std::unique_ptr<ASTConsumer>> AfterConsumers;
    152   for (FrontendPluginRegistry::iterator it = FrontendPluginRegistry::begin(),
    153                                         ie = FrontendPluginRegistry::end();
    154        it != ie; ++it) {
    155     std::unique_ptr<PluginASTAction> P = it->instantiate();
    156     PluginASTAction::ActionType ActionType = P->getActionType();
    157     if (ActionType == PluginASTAction::Cmdline) {
    158       // This is O(|plugins| * |add_plugins|), but since both numbers are
    159       // way below 50 in practice, that's ok.
    160       for (size_t i = 0, e = CI.getFrontendOpts().AddPluginActions.size();
    161            i != e; ++i) {
    162         if (it->getName() == CI.getFrontendOpts().AddPluginActions[i]) {
    163           ActionType = PluginASTAction::AddAfterMainAction;
    164           break;
    165         }
    166       }
    167     }
    168     if ((ActionType == PluginASTAction::AddBeforeMainAction ||
    169          ActionType == PluginASTAction::AddAfterMainAction) &&
    170         P->ParseArgs(CI, CI.getFrontendOpts().PluginArgs[it->getName()])) {
    171       std::unique_ptr<ASTConsumer> PluginConsumer = P->CreateASTConsumer(CI, InFile);
    172       if (ActionType == PluginASTAction::AddBeforeMainAction) {
    173         Consumers.push_back(std::move(PluginConsumer));
    174       } else {
    175         AfterConsumers.push_back(std::move(PluginConsumer));
    176       }
    177     }
    178   }
    179 
    180   // Add to Consumers the main consumer, then all the plugins that go after it
    181   Consumers.push_back(std::move(Consumer));
    182   for (auto &C : AfterConsumers) {
    183     Consumers.push_back(std::move(C));
    184   }
    185 
    186   return llvm::make_unique<MultiplexConsumer>(std::move(Consumers));
    187 }
    188 
    189 bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
    190                                      const FrontendInputFile &Input) {
    191   assert(!Instance && "Already processing a source file!");
    192   assert(!Input.isEmpty() && "Unexpected empty filename!");
    193   setCurrentInput(Input);
    194   setCompilerInstance(&CI);
    195 
    196   StringRef InputFile = Input.getFile();
    197   bool HasBegunSourceFile = false;
    198   if (!BeginInvocation(CI))
    199     goto failure;
    200 
    201   // AST files follow a very different path, since they share objects via the
    202   // AST unit.
    203   if (Input.getKind() == IK_AST) {
    204     assert(!usesPreprocessorOnly() &&
    205            "Attempt to pass AST file to preprocessor only action!");
    206     assert(hasASTFileSupport() &&
    207            "This action does not have AST file support!");
    208 
    209     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());
    210 
    211     std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromASTFile(
    212         InputFile, CI.getPCHContainerReader(), Diags, CI.getFileSystemOpts(),
    213         CI.getCodeGenOpts().DebugTypeExtRefs);
    214 
    215     if (!AST)
    216       goto failure;
    217 
    218     // Inform the diagnostic client we are processing a source file.
    219     CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
    220     HasBegunSourceFile = true;
    221 
    222     // Set the shared objects, these are reset when we finish processing the
    223     // file, otherwise the CompilerInstance will happily destroy them.
    224     CI.setFileManager(&AST->getFileManager());
    225     CI.setSourceManager(&AST->getSourceManager());
    226     CI.setPreprocessor(&AST->getPreprocessor());
    227     CI.setASTContext(&AST->getASTContext());
    228 
    229     setCurrentInput(Input, std::move(AST));
    230 
    231     // Initialize the action.
    232     if (!BeginSourceFileAction(CI, InputFile))
    233       goto failure;
    234 
    235     // Create the AST consumer.
    236     CI.setASTConsumer(CreateWrappedASTConsumer(CI, InputFile));
    237     if (!CI.hasASTConsumer())
    238       goto failure;
    239 
    240     return true;
    241   }
    242 
    243   if (!CI.hasVirtualFileSystem()) {
    244     if (IntrusiveRefCntPtr<vfs::FileSystem> VFS =
    245           createVFSFromCompilerInvocation(CI.getInvocation(),
    246                                           CI.getDiagnostics()))
    247       CI.setVirtualFileSystem(VFS);
    248     else
    249       goto failure;
    250   }
    251 
    252   // Set up the file and source managers, if needed.
    253   if (!CI.hasFileManager())
    254     CI.createFileManager();
    255   if (!CI.hasSourceManager())
    256     CI.createSourceManager(CI.getFileManager());
    257 
    258   // IR files bypass the rest of initialization.
    259   if (Input.getKind() == IK_LLVM_IR) {
    260     assert(hasIRSupport() &&
    261            "This action does not have IR file support!");
    262 
    263     // Inform the diagnostic client we are processing a source file.
    264     CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
    265     HasBegunSourceFile = true;
    266 
    267     // Initialize the action.
    268     if (!BeginSourceFileAction(CI, InputFile))
    269       goto failure;
    270 
    271     // Initialize the main file entry.
    272     if (!CI.InitializeSourceManager(CurrentInput))
    273       goto failure;
    274 
    275     return true;
    276   }
    277 
    278   // If the implicit PCH include is actually a directory, rather than
    279   // a single file, search for a suitable PCH file in that directory.
    280   if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
    281     FileManager &FileMgr = CI.getFileManager();
    282     PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
    283     StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
    284     std::string SpecificModuleCachePath = CI.getSpecificModuleCachePath();
    285     if (const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude)) {
    286       std::error_code EC;
    287       SmallString<128> DirNative;
    288       llvm::sys::path::native(PCHDir->getName(), DirNative);
    289       bool Found = false;
    290       for (llvm::sys::fs::directory_iterator Dir(DirNative, EC), DirEnd;
    291            Dir != DirEnd && !EC; Dir.increment(EC)) {
    292         // Check whether this is an acceptable AST file.
    293         if (ASTReader::isAcceptableASTFile(
    294                 Dir->path(), FileMgr, CI.getPCHContainerReader(),
    295                 CI.getLangOpts(), CI.getTargetOpts(), CI.getPreprocessorOpts(),
    296                 SpecificModuleCachePath)) {
    297           PPOpts.ImplicitPCHInclude = Dir->path();
    298           Found = true;
    299           break;
    300         }
    301       }
    302 
    303       if (!Found) {
    304         CI.getDiagnostics().Report(diag::err_fe_no_pch_in_dir) << PCHInclude;
    305         goto failure;
    306       }
    307     }
    308   }
    309 
    310   // Set up the preprocessor if needed. When parsing model files the
    311   // preprocessor of the original source is reused.
    312   if (!isModelParsingAction())
    313     CI.createPreprocessor(getTranslationUnitKind());
    314 
    315   // Inform the diagnostic client we are processing a source file.
    316   CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
    317                                            &CI.getPreprocessor());
    318   HasBegunSourceFile = true;
    319 
    320   // Initialize the action.
    321   if (!BeginSourceFileAction(CI, InputFile))
    322     goto failure;
    323 
    324   // Initialize the main file entry. It is important that this occurs after
    325   // BeginSourceFileAction, which may change CurrentInput during module builds.
    326   if (!CI.InitializeSourceManager(CurrentInput))
    327     goto failure;
    328 
    329   // Create the AST context and consumer unless this is a preprocessor only
    330   // action.
    331   if (!usesPreprocessorOnly()) {
    332     // Parsing a model file should reuse the existing ASTContext.
    333     if (!isModelParsingAction())
    334       CI.createASTContext();
    335 
    336     std::unique_ptr<ASTConsumer> Consumer =
    337         CreateWrappedASTConsumer(CI, InputFile);
    338     if (!Consumer)
    339       goto failure;
    340 
    341     // FIXME: should not overwrite ASTMutationListener when parsing model files?
    342     if (!isModelParsingAction())
    343       CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());
    344 
    345     if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) {
    346       // Convert headers to PCH and chain them.
    347       IntrusiveRefCntPtr<ExternalSemaSource> source, FinalReader;
    348       source = createChainedIncludesSource(CI, FinalReader);
    349       if (!source)
    350         goto failure;
    351       CI.setModuleManager(static_cast<ASTReader *>(FinalReader.get()));
    352       CI.getASTContext().setExternalSource(source);
    353     } else if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
    354       // Use PCH.
    355       assert(hasPCHSupport() && "This action does not have PCH support!");
    356       ASTDeserializationListener *DeserialListener =
    357           Consumer->GetASTDeserializationListener();
    358       bool DeleteDeserialListener = false;
    359       if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls) {
    360         DeserialListener = new DeserializedDeclsDumper(DeserialListener,
    361                                                        DeleteDeserialListener);
    362         DeleteDeserialListener = true;
    363       }
    364       if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty()) {
    365         DeserialListener = new DeserializedDeclsChecker(
    366             CI.getASTContext(),
    367             CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
    368             DeserialListener, DeleteDeserialListener);
    369         DeleteDeserialListener = true;
    370       }
    371       CI.createPCHExternalASTSource(
    372           CI.getPreprocessorOpts().ImplicitPCHInclude,
    373           CI.getPreprocessorOpts().DisablePCHValidation,
    374           CI.getPreprocessorOpts().AllowPCHWithCompilerErrors, DeserialListener,
    375           DeleteDeserialListener);
    376       if (!CI.getASTContext().getExternalSource())
    377         goto failure;
    378     }
    379 
    380     CI.setASTConsumer(std::move(Consumer));
    381     if (!CI.hasASTConsumer())
    382       goto failure;
    383   }
    384 
    385   // Initialize built-in info as long as we aren't using an external AST
    386   // source.
    387   if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) {
    388     Preprocessor &PP = CI.getPreprocessor();
    389 
    390     // If modules are enabled, create the module manager before creating
    391     // any builtins, so that all declarations know that they might be
    392     // extended by an external source.
    393     if (CI.getLangOpts().Modules)
    394       CI.createModuleManager();
    395 
    396     PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
    397                                            PP.getLangOpts());
    398   } else {
    399     // FIXME: If this is a problem, recover from it by creating a multiplex
    400     // source.
    401     assert((!CI.getLangOpts().Modules || CI.getModuleManager()) &&
    402            "modules enabled but created an external source that "
    403            "doesn't support modules");
    404   }
    405 
    406   // If we were asked to load any module map files, do so now.
    407   for (const auto &Filename : CI.getFrontendOpts().ModuleMapFiles) {
    408     if (auto *File = CI.getFileManager().getFile(Filename))
    409       CI.getPreprocessor().getHeaderSearchInfo().loadModuleMapFile(
    410           File, /*IsSystem*/false);
    411     else
    412       CI.getDiagnostics().Report(diag::err_module_map_not_found) << Filename;
    413   }
    414 
    415   // If we were asked to load any module files, do so now.
    416   for (const auto &ModuleFile : CI.getFrontendOpts().ModuleFiles)
    417     if (!CI.loadModuleFile(ModuleFile))
    418       goto failure;
    419 
    420   // If there is a layout overrides file, attach an external AST source that
    421   // provides the layouts from that file.
    422   if (!CI.getFrontendOpts().OverrideRecordLayoutsFile.empty() &&
    423       CI.hasASTContext() && !CI.getASTContext().getExternalSource()) {
    424     IntrusiveRefCntPtr<ExternalASTSource>
    425       Override(new LayoutOverrideSource(
    426                      CI.getFrontendOpts().OverrideRecordLayoutsFile));
    427     CI.getASTContext().setExternalSource(Override);
    428   }
    429 
    430   return true;
    431 
    432   // If we failed, reset state since the client will not end up calling the
    433   // matching EndSourceFile().
    434   failure:
    435   if (isCurrentFileAST()) {
    436     CI.setASTContext(nullptr);
    437     CI.setPreprocessor(nullptr);
    438     CI.setSourceManager(nullptr);
    439     CI.setFileManager(nullptr);
    440   }
    441 
    442   if (HasBegunSourceFile)
    443     CI.getDiagnosticClient().EndSourceFile();
    444   CI.clearOutputFiles(/*EraseFiles=*/true);
    445   setCurrentInput(FrontendInputFile());
    446   setCompilerInstance(nullptr);
    447   return false;
    448 }
    449 
    450 bool FrontendAction::Execute() {
    451   CompilerInstance &CI = getCompilerInstance();
    452 
    453   if (CI.hasFrontendTimer()) {
    454     llvm::TimeRegion Timer(CI.getFrontendTimer());
    455     ExecuteAction();
    456   }
    457   else ExecuteAction();
    458 
    459   // If we are supposed to rebuild the global module index, do so now unless
    460   // there were any module-build failures.
    461   if (CI.shouldBuildGlobalModuleIndex() && CI.hasFileManager() &&
    462       CI.hasPreprocessor()) {
    463     StringRef Cache =
    464         CI.getPreprocessor().getHeaderSearchInfo().getModuleCachePath();
    465     if (!Cache.empty())
    466       GlobalModuleIndex::writeIndex(CI.getFileManager(),
    467                                     CI.getPCHContainerReader(), Cache);
    468   }
    469 
    470   return true;
    471 }
    472 
    473 void FrontendAction::EndSourceFile() {
    474   CompilerInstance &CI = getCompilerInstance();
    475 
    476   // Inform the diagnostic client we are done with this source file.
    477   CI.getDiagnosticClient().EndSourceFile();
    478 
    479   // Inform the preprocessor we are done.
    480   if (CI.hasPreprocessor())
    481     CI.getPreprocessor().EndSourceFile();
    482 
    483   // Finalize the action.
    484   EndSourceFileAction();
    485 
    486   // Sema references the ast consumer, so reset sema first.
    487   //
    488   // FIXME: There is more per-file stuff we could just drop here?
    489   bool DisableFree = CI.getFrontendOpts().DisableFree;
    490   if (DisableFree) {
    491     CI.resetAndLeakSema();
    492     CI.resetAndLeakASTContext();
    493     BuryPointer(CI.takeASTConsumer().get());
    494   } else {
    495     CI.setSema(nullptr);
    496     CI.setASTContext(nullptr);
    497     CI.setASTConsumer(nullptr);
    498   }
    499 
    500   if (CI.getFrontendOpts().ShowStats) {
    501     llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n";
    502     CI.getPreprocessor().PrintStats();
    503     CI.getPreprocessor().getIdentifierTable().PrintStats();
    504     CI.getPreprocessor().getHeaderSearchInfo().PrintStats();
    505     CI.getSourceManager().PrintStats();
    506     llvm::errs() << "\n";
    507   }
    508 
    509   // Cleanup the output streams, and erase the output files if instructed by the
    510   // FrontendAction.
    511   CI.clearOutputFiles(/*EraseFiles=*/shouldEraseOutputFiles());
    512 
    513   if (isCurrentFileAST()) {
    514     if (DisableFree) {
    515       CI.resetAndLeakPreprocessor();
    516       CI.resetAndLeakSourceManager();
    517       CI.resetAndLeakFileManager();
    518     } else {
    519       CI.setPreprocessor(nullptr);
    520       CI.setSourceManager(nullptr);
    521       CI.setFileManager(nullptr);
    522     }
    523   }
    524 
    525   setCompilerInstance(nullptr);
    526   setCurrentInput(FrontendInputFile());
    527 }
    528 
    529 bool FrontendAction::shouldEraseOutputFiles() {
    530   return getCompilerInstance().getDiagnostics().hasErrorOccurred();
    531 }
    532 
    533 //===----------------------------------------------------------------------===//
    534 // Utility Actions
    535 //===----------------------------------------------------------------------===//
    536 
    537 void ASTFrontendAction::ExecuteAction() {
    538   CompilerInstance &CI = getCompilerInstance();
    539   if (!CI.hasPreprocessor())
    540     return;
    541 
    542   // FIXME: Move the truncation aspect of this into Sema, we delayed this till
    543   // here so the source manager would be initialized.
    544   if (hasCodeCompletionSupport() &&
    545       !CI.getFrontendOpts().CodeCompletionAt.FileName.empty())
    546     CI.createCodeCompletionConsumer();
    547 
    548   // Use a code completion consumer?
    549   CodeCompleteConsumer *CompletionConsumer = nullptr;
    550   if (CI.hasCodeCompletionConsumer())
    551     CompletionConsumer = &CI.getCodeCompletionConsumer();
    552 
    553   if (!CI.hasSema())
    554     CI.createSema(getTranslationUnitKind(), CompletionConsumer);
    555 
    556   ParseAST(CI.getSema(), CI.getFrontendOpts().ShowStats,
    557            CI.getFrontendOpts().SkipFunctionBodies);
    558 }
    559 
    560 void PluginASTAction::anchor() { }
    561 
    562 std::unique_ptr<ASTConsumer>
    563 PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI,
    564                                               StringRef InFile) {
    565   llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!");
    566 }
    567 
    568 std::unique_ptr<ASTConsumer>
    569 WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI,
    570                                          StringRef InFile) {
    571   return WrappedAction->CreateASTConsumer(CI, InFile);
    572 }
    573 bool WrapperFrontendAction::BeginInvocation(CompilerInstance &CI) {
    574   return WrappedAction->BeginInvocation(CI);
    575 }
    576 bool WrapperFrontendAction::BeginSourceFileAction(CompilerInstance &CI,
    577                                                   StringRef Filename) {
    578   WrappedAction->setCurrentInput(getCurrentInput());
    579   WrappedAction->setCompilerInstance(&CI);
    580   auto Ret = WrappedAction->BeginSourceFileAction(CI, Filename);
    581   // BeginSourceFileAction may change CurrentInput, e.g. during module builds.
    582   setCurrentInput(WrappedAction->getCurrentInput());
    583   return Ret;
    584 }
    585 void WrapperFrontendAction::ExecuteAction() {
    586   WrappedAction->ExecuteAction();
    587 }
    588 void WrapperFrontendAction::EndSourceFileAction() {
    589   WrappedAction->EndSourceFileAction();
    590 }
    591 
    592 bool WrapperFrontendAction::usesPreprocessorOnly() const {
    593   return WrappedAction->usesPreprocessorOnly();
    594 }
    595 TranslationUnitKind WrapperFrontendAction::getTranslationUnitKind() {
    596   return WrappedAction->getTranslationUnitKind();
    597 }
    598 bool WrapperFrontendAction::hasPCHSupport() const {
    599   return WrappedAction->hasPCHSupport();
    600 }
    601 bool WrapperFrontendAction::hasASTFileSupport() const {
    602   return WrappedAction->hasASTFileSupport();
    603 }
    604 bool WrapperFrontendAction::hasIRSupport() const {
    605   return WrappedAction->hasIRSupport();
    606 }
    607 bool WrapperFrontendAction::hasCodeCompletionSupport() const {
    608   return WrappedAction->hasCodeCompletionSupport();
    609 }
    610 
    611 WrapperFrontendAction::WrapperFrontendAction(
    612     std::unique_ptr<FrontendAction> WrappedAction)
    613   : WrappedAction(std::move(WrappedAction)) {}
    614 
    615