diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/Frontend/FrontendAction.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/Frontend/FrontendAction.cpp | 580 |
1 files changed, 580 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Frontend/FrontendAction.cpp b/contrib/llvm/tools/clang/lib/Frontend/FrontendAction.cpp new file mode 100644 index 0000000..c81c81a --- /dev/null +++ b/contrib/llvm/tools/clang/lib/Frontend/FrontendAction.cpp @@ -0,0 +1,580 @@ +//===--- FrontendAction.cpp -----------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "clang/Frontend/FrontendAction.h" +#include "clang/AST/ASTConsumer.h" +#include "clang/AST/ASTContext.h" +#include "clang/AST/DeclGroup.h" +#include "clang/Frontend/ASTUnit.h" +#include "clang/Frontend/CompilerInstance.h" +#include "clang/Frontend/FrontendDiagnostic.h" +#include "clang/Frontend/FrontendPluginRegistry.h" +#include "clang/Frontend/LayoutOverrideSource.h" +#include "clang/Frontend/MultiplexConsumer.h" +#include "clang/Frontend/Utils.h" +#include "clang/Lex/HeaderSearch.h" +#include "clang/Lex/Preprocessor.h" +#include "clang/Parse/ParseAST.h" +#include "clang/Serialization/ASTDeserializationListener.h" +#include "clang/Serialization/ASTReader.h" +#include "clang/Serialization/GlobalModuleIndex.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/FileSystem.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Timer.h" +#include "llvm/Support/raw_ostream.h" +#include <system_error> +using namespace clang; + +template class llvm::Registry<clang::PluginASTAction>; + +namespace { + +class DelegatingDeserializationListener : public ASTDeserializationListener { + ASTDeserializationListener *Previous; + bool DeletePrevious; + +public: + explicit DelegatingDeserializationListener( + ASTDeserializationListener *Previous, bool DeletePrevious) + : Previous(Previous), DeletePrevious(DeletePrevious) {} + virtual ~DelegatingDeserializationListener() { + if (DeletePrevious) + delete Previous; + } + + void ReaderInitialized(ASTReader *Reader) override { + if (Previous) + Previous->ReaderInitialized(Reader); + } + void IdentifierRead(serialization::IdentID ID, + IdentifierInfo *II) override { + if (Previous) + Previous->IdentifierRead(ID, II); + } + void TypeRead(serialization::TypeIdx Idx, QualType T) override { + if (Previous) + Previous->TypeRead(Idx, T); + } + void DeclRead(serialization::DeclID ID, const Decl *D) override { + if (Previous) + Previous->DeclRead(ID, D); + } + void SelectorRead(serialization::SelectorID ID, Selector Sel) override { + if (Previous) + Previous->SelectorRead(ID, Sel); + } + void MacroDefinitionRead(serialization::PreprocessedEntityID PPID, + MacroDefinition *MD) override { + if (Previous) + Previous->MacroDefinitionRead(PPID, MD); + } +}; + +/// \brief Dumps deserialized declarations. +class DeserializedDeclsDumper : public DelegatingDeserializationListener { +public: + explicit DeserializedDeclsDumper(ASTDeserializationListener *Previous, + bool DeletePrevious) + : DelegatingDeserializationListener(Previous, DeletePrevious) {} + + void DeclRead(serialization::DeclID ID, const Decl *D) override { + llvm::outs() << "PCH DECL: " << D->getDeclKindName(); + if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) + llvm::outs() << " - " << *ND; + llvm::outs() << "\n"; + + DelegatingDeserializationListener::DeclRead(ID, D); + } +}; + +/// \brief Checks deserialized declarations and emits error if a name +/// matches one given in command-line using -error-on-deserialized-decl. +class DeserializedDeclsChecker : public DelegatingDeserializationListener { + ASTContext &Ctx; + std::set<std::string> NamesToCheck; + +public: + DeserializedDeclsChecker(ASTContext &Ctx, + const std::set<std::string> &NamesToCheck, + ASTDeserializationListener *Previous, + bool DeletePrevious) + : DelegatingDeserializationListener(Previous, DeletePrevious), Ctx(Ctx), + NamesToCheck(NamesToCheck) {} + + void DeclRead(serialization::DeclID ID, const Decl *D) override { + if (const NamedDecl *ND = dyn_cast<NamedDecl>(D)) + if (NamesToCheck.find(ND->getNameAsString()) != NamesToCheck.end()) { + unsigned DiagID + = Ctx.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Error, + "%0 was deserialized"); + Ctx.getDiagnostics().Report(Ctx.getFullLoc(D->getLocation()), DiagID) + << ND->getNameAsString(); + } + + DelegatingDeserializationListener::DeclRead(ID, D); + } +}; + +} // end anonymous namespace + +FrontendAction::FrontendAction() : Instance(nullptr) {} + +FrontendAction::~FrontendAction() {} + +void FrontendAction::setCurrentInput(const FrontendInputFile &CurrentInput, + std::unique_ptr<ASTUnit> AST) { + this->CurrentInput = CurrentInput; + CurrentASTUnit = std::move(AST); +} + +std::unique_ptr<ASTConsumer> +FrontendAction::CreateWrappedASTConsumer(CompilerInstance &CI, + StringRef InFile) { + std::unique_ptr<ASTConsumer> Consumer = CreateASTConsumer(CI, InFile); + if (!Consumer) + return nullptr; + + if (CI.getFrontendOpts().AddPluginActions.size() == 0) + return Consumer; + + // Make sure the non-plugin consumer is first, so that plugins can't + // modifiy the AST. + std::vector<std::unique_ptr<ASTConsumer>> Consumers; + Consumers.push_back(std::move(Consumer)); + + for (size_t i = 0, e = CI.getFrontendOpts().AddPluginActions.size(); + i != e; ++i) { + // This is O(|plugins| * |add_plugins|), but since both numbers are + // way below 50 in practice, that's ok. + for (FrontendPluginRegistry::iterator + it = FrontendPluginRegistry::begin(), + ie = FrontendPluginRegistry::end(); + it != ie; ++it) { + if (it->getName() != CI.getFrontendOpts().AddPluginActions[i]) + continue; + std::unique_ptr<PluginASTAction> P = it->instantiate(); + if (P->ParseArgs(CI, CI.getFrontendOpts().AddPluginArgs[i])) + Consumers.push_back(P->CreateASTConsumer(CI, InFile)); + } + } + + return llvm::make_unique<MultiplexConsumer>(std::move(Consumers)); +} + +bool FrontendAction::BeginSourceFile(CompilerInstance &CI, + const FrontendInputFile &Input) { + assert(!Instance && "Already processing a source file!"); + assert(!Input.isEmpty() && "Unexpected empty filename!"); + setCurrentInput(Input); + setCompilerInstance(&CI); + + StringRef InputFile = Input.getFile(); + bool HasBegunSourceFile = false; + if (!BeginInvocation(CI)) + goto failure; + + // AST files follow a very different path, since they share objects via the + // AST unit. + if (Input.getKind() == IK_AST) { + assert(!usesPreprocessorOnly() && + "Attempt to pass AST file to preprocessor only action!"); + assert(hasASTFileSupport() && + "This action does not have AST file support!"); + + IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics()); + + std::unique_ptr<ASTUnit> AST = + ASTUnit::LoadFromASTFile(InputFile, Diags, CI.getFileSystemOpts()); + + if (!AST) + goto failure; + + // Inform the diagnostic client we are processing a source file. + CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr); + HasBegunSourceFile = true; + + // Set the shared objects, these are reset when we finish processing the + // file, otherwise the CompilerInstance will happily destroy them. + CI.setFileManager(&AST->getFileManager()); + CI.setSourceManager(&AST->getSourceManager()); + CI.setPreprocessor(&AST->getPreprocessor()); + CI.setASTContext(&AST->getASTContext()); + + setCurrentInput(Input, std::move(AST)); + + // Initialize the action. + if (!BeginSourceFileAction(CI, InputFile)) + goto failure; + + // Create the AST consumer. + CI.setASTConsumer(CreateWrappedASTConsumer(CI, InputFile)); + if (!CI.hasASTConsumer()) + goto failure; + + return true; + } + + if (!CI.hasVirtualFileSystem()) { + if (IntrusiveRefCntPtr<vfs::FileSystem> VFS = + createVFSFromCompilerInvocation(CI.getInvocation(), + CI.getDiagnostics())) + CI.setVirtualFileSystem(VFS); + else + goto failure; + } + + // Set up the file and source managers, if needed. + if (!CI.hasFileManager()) + CI.createFileManager(); + if (!CI.hasSourceManager()) + CI.createSourceManager(CI.getFileManager()); + + // IR files bypass the rest of initialization. + if (Input.getKind() == IK_LLVM_IR) { + assert(hasIRSupport() && + "This action does not have IR file support!"); + + // Inform the diagnostic client we are processing a source file. + CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr); + HasBegunSourceFile = true; + + // Initialize the action. + if (!BeginSourceFileAction(CI, InputFile)) + goto failure; + + // Initialize the main file entry. + if (!CI.InitializeSourceManager(CurrentInput)) + goto failure; + + return true; + } + + // If the implicit PCH include is actually a directory, rather than + // a single file, search for a suitable PCH file in that directory. + if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) { + FileManager &FileMgr = CI.getFileManager(); + PreprocessorOptions &PPOpts = CI.getPreprocessorOpts(); + StringRef PCHInclude = PPOpts.ImplicitPCHInclude; + if (const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude)) { + std::error_code EC; + SmallString<128> DirNative; + llvm::sys::path::native(PCHDir->getName(), DirNative); + bool Found = false; + for (llvm::sys::fs::directory_iterator Dir(DirNative.str(), EC), DirEnd; + Dir != DirEnd && !EC; Dir.increment(EC)) { + // Check whether this is an acceptable AST file. + if (ASTReader::isAcceptableASTFile(Dir->path(), FileMgr, + CI.getLangOpts(), + CI.getTargetOpts(), + CI.getPreprocessorOpts())) { + PPOpts.ImplicitPCHInclude = Dir->path(); + Found = true; + break; + } + } + + if (!Found) { + CI.getDiagnostics().Report(diag::err_fe_no_pch_in_dir) << PCHInclude; + return true; + } + } + } + + // Set up the preprocessor if needed. When parsing model files the + // preprocessor of the original source is reused. + if (!isModelParsingAction()) + CI.createPreprocessor(getTranslationUnitKind()); + + // Inform the diagnostic client we are processing a source file. + CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), + &CI.getPreprocessor()); + HasBegunSourceFile = true; + + // Initialize the action. + if (!BeginSourceFileAction(CI, InputFile)) + goto failure; + + // Initialize the main file entry. It is important that this occurs after + // BeginSourceFileAction, which may change CurrentInput during module builds. + if (!CI.InitializeSourceManager(CurrentInput)) + goto failure; + + // Create the AST context and consumer unless this is a preprocessor only + // action. + if (!usesPreprocessorOnly()) { + // Parsing a model file should reuse the existing ASTContext. + if (!isModelParsingAction()) + CI.createASTContext(); + + std::unique_ptr<ASTConsumer> Consumer = + CreateWrappedASTConsumer(CI, InputFile); + if (!Consumer) + goto failure; + + // FIXME: should not overwrite ASTMutationListener when parsing model files? + if (!isModelParsingAction()) + CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener()); + + if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) { + // Convert headers to PCH and chain them. + IntrusiveRefCntPtr<ExternalSemaSource> source, FinalReader; + source = createChainedIncludesSource(CI, FinalReader); + if (!source) + goto failure; + CI.setModuleManager(static_cast<ASTReader *>(FinalReader.get())); + CI.getASTContext().setExternalSource(source); + } else if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) { + // Use PCH. + assert(hasPCHSupport() && "This action does not have PCH support!"); + ASTDeserializationListener *DeserialListener = + Consumer->GetASTDeserializationListener(); + bool DeleteDeserialListener = false; + if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls) { + DeserialListener = new DeserializedDeclsDumper(DeserialListener, + DeleteDeserialListener); + DeleteDeserialListener = true; + } + if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty()) { + DeserialListener = new DeserializedDeclsChecker( + CI.getASTContext(), + CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn, + DeserialListener, DeleteDeserialListener); + DeleteDeserialListener = true; + } + CI.createPCHExternalASTSource( + CI.getPreprocessorOpts().ImplicitPCHInclude, + CI.getPreprocessorOpts().DisablePCHValidation, + CI.getPreprocessorOpts().AllowPCHWithCompilerErrors, DeserialListener, + DeleteDeserialListener); + if (!CI.getASTContext().getExternalSource()) + goto failure; + } + + CI.setASTConsumer(std::move(Consumer)); + if (!CI.hasASTConsumer()) + goto failure; + } + + // Initialize built-in info as long as we aren't using an external AST + // source. + if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) { + Preprocessor &PP = CI.getPreprocessor(); + + // If modules are enabled, create the module manager before creating + // any builtins, so that all declarations know that they might be + // extended by an external source. + if (CI.getLangOpts().Modules) + CI.createModuleManager(); + + PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(), + PP.getLangOpts()); + } else { + // FIXME: If this is a problem, recover from it by creating a multiplex + // source. + assert((!CI.getLangOpts().Modules || CI.getModuleManager()) && + "modules enabled but created an external source that " + "doesn't support modules"); + } + + // If we were asked to load any module files, do so now. + for (const auto &ModuleFile : CI.getFrontendOpts().ModuleFiles) + if (!CI.loadModuleFile(ModuleFile)) + goto failure; + + // If there is a layout overrides file, attach an external AST source that + // provides the layouts from that file. + if (!CI.getFrontendOpts().OverrideRecordLayoutsFile.empty() && + CI.hasASTContext() && !CI.getASTContext().getExternalSource()) { + IntrusiveRefCntPtr<ExternalASTSource> + Override(new LayoutOverrideSource( + CI.getFrontendOpts().OverrideRecordLayoutsFile)); + CI.getASTContext().setExternalSource(Override); + } + + return true; + + // If we failed, reset state since the client will not end up calling the + // matching EndSourceFile(). + failure: + if (isCurrentFileAST()) { + CI.setASTContext(nullptr); + CI.setPreprocessor(nullptr); + CI.setSourceManager(nullptr); + CI.setFileManager(nullptr); + } + + if (HasBegunSourceFile) + CI.getDiagnosticClient().EndSourceFile(); + CI.clearOutputFiles(/*EraseFiles=*/true); + setCurrentInput(FrontendInputFile()); + setCompilerInstance(nullptr); + return false; +} + +bool FrontendAction::Execute() { + CompilerInstance &CI = getCompilerInstance(); + + if (CI.hasFrontendTimer()) { + llvm::TimeRegion Timer(CI.getFrontendTimer()); + ExecuteAction(); + } + else ExecuteAction(); + + // If we are supposed to rebuild the global module index, do so now unless + // there were any module-build failures. + if (CI.shouldBuildGlobalModuleIndex() && CI.hasFileManager() && + CI.hasPreprocessor()) { + GlobalModuleIndex::writeIndex( + CI.getFileManager(), + CI.getPreprocessor().getHeaderSearchInfo().getModuleCachePath()); + } + + return true; +} + +void FrontendAction::EndSourceFile() { + CompilerInstance &CI = getCompilerInstance(); + + // Inform the diagnostic client we are done with this source file. + CI.getDiagnosticClient().EndSourceFile(); + + // Inform the preprocessor we are done. + if (CI.hasPreprocessor()) + CI.getPreprocessor().EndSourceFile(); + + // Finalize the action. + EndSourceFileAction(); + + // Sema references the ast consumer, so reset sema first. + // + // FIXME: There is more per-file stuff we could just drop here? + bool DisableFree = CI.getFrontendOpts().DisableFree; + if (DisableFree) { + if (!isCurrentFileAST()) { + CI.resetAndLeakSema(); + CI.resetAndLeakASTContext(); + } + BuryPointer(CI.takeASTConsumer().get()); + } else { + if (!isCurrentFileAST()) { + CI.setSema(nullptr); + CI.setASTContext(nullptr); + } + CI.setASTConsumer(nullptr); + } + + if (CI.getFrontendOpts().ShowStats) { + llvm::errs() << "\nSTATISTICS FOR '" << getCurrentFile() << "':\n"; + CI.getPreprocessor().PrintStats(); + CI.getPreprocessor().getIdentifierTable().PrintStats(); + CI.getPreprocessor().getHeaderSearchInfo().PrintStats(); + CI.getSourceManager().PrintStats(); + llvm::errs() << "\n"; + } + + // Cleanup the output streams, and erase the output files if instructed by the + // FrontendAction. + CI.clearOutputFiles(/*EraseFiles=*/shouldEraseOutputFiles()); + + // FIXME: Only do this if DisableFree is set. + if (isCurrentFileAST()) { + CI.resetAndLeakSema(); + CI.resetAndLeakASTContext(); + CI.resetAndLeakPreprocessor(); + CI.resetAndLeakSourceManager(); + CI.resetAndLeakFileManager(); + } + + setCompilerInstance(nullptr); + setCurrentInput(FrontendInputFile()); +} + +bool FrontendAction::shouldEraseOutputFiles() { + return getCompilerInstance().getDiagnostics().hasErrorOccurred(); +} + +//===----------------------------------------------------------------------===// +// Utility Actions +//===----------------------------------------------------------------------===// + +void ASTFrontendAction::ExecuteAction() { + CompilerInstance &CI = getCompilerInstance(); + if (!CI.hasPreprocessor()) + return; + + // FIXME: Move the truncation aspect of this into Sema, we delayed this till + // here so the source manager would be initialized. + if (hasCodeCompletionSupport() && + !CI.getFrontendOpts().CodeCompletionAt.FileName.empty()) + CI.createCodeCompletionConsumer(); + + // Use a code completion consumer? + CodeCompleteConsumer *CompletionConsumer = nullptr; + if (CI.hasCodeCompletionConsumer()) + CompletionConsumer = &CI.getCodeCompletionConsumer(); + + if (!CI.hasSema()) + CI.createSema(getTranslationUnitKind(), CompletionConsumer); + + ParseAST(CI.getSema(), CI.getFrontendOpts().ShowStats, + CI.getFrontendOpts().SkipFunctionBodies); +} + +void PluginASTAction::anchor() { } + +std::unique_ptr<ASTConsumer> +PreprocessorFrontendAction::CreateASTConsumer(CompilerInstance &CI, + StringRef InFile) { + llvm_unreachable("Invalid CreateASTConsumer on preprocessor action!"); +} + +std::unique_ptr<ASTConsumer> +WrapperFrontendAction::CreateASTConsumer(CompilerInstance &CI, + StringRef InFile) { + return WrappedAction->CreateASTConsumer(CI, InFile); +} +bool WrapperFrontendAction::BeginInvocation(CompilerInstance &CI) { + return WrappedAction->BeginInvocation(CI); +} +bool WrapperFrontendAction::BeginSourceFileAction(CompilerInstance &CI, + StringRef Filename) { + WrappedAction->setCurrentInput(getCurrentInput()); + WrappedAction->setCompilerInstance(&CI); + return WrappedAction->BeginSourceFileAction(CI, Filename); +} +void WrapperFrontendAction::ExecuteAction() { + WrappedAction->ExecuteAction(); +} +void WrapperFrontendAction::EndSourceFileAction() { + WrappedAction->EndSourceFileAction(); +} + +bool WrapperFrontendAction::usesPreprocessorOnly() const { + return WrappedAction->usesPreprocessorOnly(); +} +TranslationUnitKind WrapperFrontendAction::getTranslationUnitKind() { + return WrappedAction->getTranslationUnitKind(); +} +bool WrapperFrontendAction::hasPCHSupport() const { + return WrappedAction->hasPCHSupport(); +} +bool WrapperFrontendAction::hasASTFileSupport() const { + return WrappedAction->hasASTFileSupport(); +} +bool WrapperFrontendAction::hasIRSupport() const { + return WrappedAction->hasIRSupport(); +} +bool WrapperFrontendAction::hasCodeCompletionSupport() const { + return WrappedAction->hasCodeCompletionSupport(); +} + +WrapperFrontendAction::WrapperFrontendAction(FrontendAction *WrappedAction) + : WrappedAction(WrappedAction) {} + |
