1 //===--- CompilerInstance.cpp ---------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "clang/Frontend/CompilerInstance.h"
11 #include "clang/AST/ASTConsumer.h"
12 #include "clang/AST/ASTContext.h"
13 #include "clang/AST/Decl.h"
14 #include "clang/Basic/Diagnostic.h"
15 #include "clang/Basic/FileManager.h"
16 #include "clang/Basic/SourceManager.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "clang/Basic/Version.h"
19 #include "clang/Config/config.h"
20 #include "clang/Frontend/ChainedDiagnosticConsumer.h"
21 #include "clang/Frontend/FrontendAction.h"
22 #include "clang/Frontend/FrontendActions.h"
23 #include "clang/Frontend/FrontendDiagnostic.h"
24 #include "clang/Frontend/LogDiagnosticPrinter.h"
25 #include "clang/Frontend/SerializedDiagnosticPrinter.h"
26 #include "clang/Frontend/TextDiagnosticPrinter.h"
27 #include "clang/Frontend/Utils.h"
28 #include "clang/Frontend/VerifyDiagnosticConsumer.h"
29 #include "clang/Lex/HeaderSearch.h"
30 #include "clang/Lex/PTHManager.h"
31 #include "clang/Lex/Preprocessor.h"
32 #include "clang/Sema/CodeCompleteConsumer.h"
33 #include "clang/Sema/Sema.h"
34 #include "clang/Serialization/ASTReader.h"
35 #include "clang/Serialization/GlobalModuleIndex.h"
36 #include "llvm/ADT/Statistic.h"
37 #include "llvm/Support/CrashRecoveryContext.h"
38 #include "llvm/Support/Errc.h"
39 #include "llvm/Support/FileSystem.h"
40 #include "llvm/Support/Host.h"
41 #include "llvm/Support/LockFileManager.h"
42 #include "llvm/Support/MemoryBuffer.h"
43 #include "llvm/Support/Path.h"
44 #include "llvm/Support/Program.h"
45 #include "llvm/Support/Signals.h"
46 #include "llvm/Support/Timer.h"
47 #include "llvm/Support/raw_ostream.h"
49 #include <system_error>
52 using namespace clang;
54 CompilerInstance::CompilerInstance(bool BuildingModule)
55 : ModuleLoader(BuildingModule),
56 Invocation(new CompilerInvocation()), ModuleManager(nullptr),
57 BuildGlobalModuleIndex(false), HaveFullGlobalModuleIndex(false),
58 ModuleBuildFailed(false) {
61 CompilerInstance::~CompilerInstance() {
62 assert(OutputFiles.empty() && "Still output files in flight?");
65 void CompilerInstance::setInvocation(CompilerInvocation *Value) {
69 bool CompilerInstance::shouldBuildGlobalModuleIndex() const {
70 return (BuildGlobalModuleIndex ||
71 (ModuleManager && ModuleManager->isGlobalIndexUnavailable() &&
72 getFrontendOpts().GenerateGlobalModuleIndex)) &&
76 void CompilerInstance::setDiagnostics(DiagnosticsEngine *Value) {
80 void CompilerInstance::setTarget(TargetInfo *Value) {
84 void CompilerInstance::setFileManager(FileManager *Value) {
87 VirtualFileSystem = Value->getVirtualFileSystem();
89 VirtualFileSystem.reset();
92 void CompilerInstance::setSourceManager(SourceManager *Value) {
96 void CompilerInstance::setPreprocessor(Preprocessor *Value) { PP = Value; }
98 void CompilerInstance::setASTContext(ASTContext *Value) { Context = Value; }
100 void CompilerInstance::setSema(Sema *S) {
104 void CompilerInstance::setASTConsumer(ASTConsumer *Value) {
105 Consumer.reset(Value);
108 void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
109 CompletionConsumer.reset(Value);
112 IntrusiveRefCntPtr<ASTReader> CompilerInstance::getModuleManager() const {
113 return ModuleManager;
115 void CompilerInstance::setModuleManager(IntrusiveRefCntPtr<ASTReader> Reader) {
116 ModuleManager = Reader;
119 std::shared_ptr<ModuleDependencyCollector>
120 CompilerInstance::getModuleDepCollector() const {
121 return ModuleDepCollector;
124 void CompilerInstance::setModuleDepCollector(
125 std::shared_ptr<ModuleDependencyCollector> Collector) {
126 ModuleDepCollector = Collector;
130 static void SetUpDiagnosticLog(DiagnosticOptions *DiagOpts,
131 const CodeGenOptions *CodeGenOpts,
132 DiagnosticsEngine &Diags) {
133 std::string ErrorInfo;
134 bool OwnsStream = false;
135 raw_ostream *OS = &llvm::errs();
136 if (DiagOpts->DiagnosticLogFile != "-") {
137 // Create the output stream.
138 llvm::raw_fd_ostream *FileOS(new llvm::raw_fd_ostream(
139 DiagOpts->DiagnosticLogFile.c_str(), ErrorInfo,
140 llvm::sys::fs::F_Append | llvm::sys::fs::F_Text));
141 if (!ErrorInfo.empty()) {
142 Diags.Report(diag::warn_fe_cc_log_diagnostics_failure)
143 << DiagOpts->DiagnosticLogFile << ErrorInfo;
145 FileOS->SetUnbuffered();
146 FileOS->SetUseAtomicWrites(true);
152 // Chain in the diagnostic client which will log the diagnostics.
153 LogDiagnosticPrinter *Logger = new LogDiagnosticPrinter(*OS, DiagOpts,
156 Logger->setDwarfDebugFlags(CodeGenOpts->DwarfDebugFlags);
157 Diags.setClient(new ChainedDiagnosticConsumer(Diags.takeClient(), Logger));
160 static void SetupSerializedDiagnostics(DiagnosticOptions *DiagOpts,
161 DiagnosticsEngine &Diags,
162 StringRef OutputFile) {
163 std::string ErrorInfo;
164 std::unique_ptr<llvm::raw_fd_ostream> OS;
165 OS.reset(new llvm::raw_fd_ostream(OutputFile.str().c_str(), ErrorInfo,
166 llvm::sys::fs::F_None));
168 if (!ErrorInfo.empty()) {
169 Diags.Report(diag::warn_fe_serialized_diag_failure)
170 << OutputFile << ErrorInfo;
174 DiagnosticConsumer *SerializedConsumer =
175 clang::serialized_diags::create(OS.release(), DiagOpts);
177 Diags.setClient(new ChainedDiagnosticConsumer(Diags.takeClient(),
178 SerializedConsumer));
181 void CompilerInstance::createDiagnostics(DiagnosticConsumer *Client,
182 bool ShouldOwnClient) {
183 Diagnostics = createDiagnostics(&getDiagnosticOpts(), Client,
184 ShouldOwnClient, &getCodeGenOpts());
187 IntrusiveRefCntPtr<DiagnosticsEngine>
188 CompilerInstance::createDiagnostics(DiagnosticOptions *Opts,
189 DiagnosticConsumer *Client,
190 bool ShouldOwnClient,
191 const CodeGenOptions *CodeGenOpts) {
192 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
193 IntrusiveRefCntPtr<DiagnosticsEngine>
194 Diags(new DiagnosticsEngine(DiagID, Opts));
196 // Create the diagnostic client for reporting errors or for
197 // implementing -verify.
199 Diags->setClient(Client, ShouldOwnClient);
201 Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
203 // Chain in -verify checker, if requested.
204 if (Opts->VerifyDiagnostics)
205 Diags->setClient(new VerifyDiagnosticConsumer(*Diags));
207 // Chain in -diagnostic-log-file dumper, if requested.
208 if (!Opts->DiagnosticLogFile.empty())
209 SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags);
211 if (!Opts->DiagnosticSerializationFile.empty())
212 SetupSerializedDiagnostics(Opts, *Diags,
213 Opts->DiagnosticSerializationFile);
215 // Configure our handling of diagnostics.
216 ProcessWarningOptions(*Diags, *Opts);
223 void CompilerInstance::createFileManager() {
224 if (!hasVirtualFileSystem()) {
225 // TODO: choose the virtual file system based on the CompilerInvocation.
226 setVirtualFileSystem(vfs::getRealFileSystem());
228 FileMgr = new FileManager(getFileSystemOpts(), VirtualFileSystem);
233 void CompilerInstance::createSourceManager(FileManager &FileMgr) {
234 SourceMgr = new SourceManager(getDiagnostics(), FileMgr);
237 // Initialize the remapping of files to alternative contents, e.g.,
238 // those specified through other files.
239 static void InitializeFileRemapping(DiagnosticsEngine &Diags,
240 SourceManager &SourceMgr,
241 FileManager &FileMgr,
242 const PreprocessorOptions &InitOpts) {
243 // Remap files in the source manager (with buffers).
244 for (const auto &RB : InitOpts.RemappedFileBuffers) {
245 // Create the file entry for the file that we're mapping from.
246 const FileEntry *FromFile =
247 FileMgr.getVirtualFile(RB.first, RB.second->getBufferSize(), 0);
249 Diags.Report(diag::err_fe_remap_missing_from_file) << RB.first;
250 if (!InitOpts.RetainRemappedFileBuffers)
255 // Override the contents of the "from" file with the contents of
257 SourceMgr.overrideFileContents(FromFile, RB.second,
258 InitOpts.RetainRemappedFileBuffers);
261 // Remap files in the source manager (with other files).
262 for (const auto &RF : InitOpts.RemappedFiles) {
263 // Find the file that we're mapping to.
264 const FileEntry *ToFile = FileMgr.getFile(RF.second);
266 Diags.Report(diag::err_fe_remap_missing_to_file) << RF.first << RF.second;
270 // Create the file entry for the file that we're mapping from.
271 const FileEntry *FromFile =
272 FileMgr.getVirtualFile(RF.first, ToFile->getSize(), 0);
274 Diags.Report(diag::err_fe_remap_missing_from_file) << RF.first;
278 // Override the contents of the "from" file with the contents of
280 SourceMgr.overrideFileContents(FromFile, ToFile);
283 SourceMgr.setOverridenFilesKeepOriginalName(
284 InitOpts.RemappedFilesKeepOriginalName);
289 void CompilerInstance::createPreprocessor(TranslationUnitKind TUKind) {
290 const PreprocessorOptions &PPOpts = getPreprocessorOpts();
292 // Create a PTH manager if we are using some form of a token cache.
293 PTHManager *PTHMgr = nullptr;
294 if (!PPOpts.TokenCache.empty())
295 PTHMgr = PTHManager::Create(PPOpts.TokenCache, getDiagnostics());
297 // Create the Preprocessor.
298 HeaderSearch *HeaderInfo = new HeaderSearch(&getHeaderSearchOpts(),
303 PP = new Preprocessor(&getPreprocessorOpts(), getDiagnostics(), getLangOpts(),
304 getSourceManager(), *HeaderInfo, *this, PTHMgr,
305 /*OwnsHeaderSearch=*/true, TUKind);
306 PP->Initialize(getTarget());
308 // Note that this is different then passing PTHMgr to Preprocessor's ctor.
309 // That argument is used as the IdentifierInfoLookup argument to
310 // IdentifierTable's ctor.
312 PTHMgr->setPreprocessor(&*PP);
313 PP->setPTHManager(PTHMgr);
316 if (PPOpts.DetailedRecord)
317 PP->createPreprocessingRecord();
319 // Apply remappings to the source manager.
320 InitializeFileRemapping(PP->getDiagnostics(), PP->getSourceManager(),
321 PP->getFileManager(), PPOpts);
323 // Predefine macros and configure the preprocessor.
324 InitializePreprocessor(*PP, PPOpts, getFrontendOpts());
326 // Initialize the header search object.
327 ApplyHeaderSearchOptions(PP->getHeaderSearchInfo(), getHeaderSearchOpts(),
328 PP->getLangOpts(), PP->getTargetInfo().getTriple());
330 PP->setPreprocessedOutput(getPreprocessorOutputOpts().ShowCPP);
332 // Set up the module path, including the hash for the
333 // module-creation options.
334 SmallString<256> SpecificModuleCache(
335 getHeaderSearchOpts().ModuleCachePath);
336 if (!getHeaderSearchOpts().DisableModuleHash)
337 llvm::sys::path::append(SpecificModuleCache,
338 getInvocation().getModuleHash());
339 PP->getHeaderSearchInfo().setModuleCachePath(SpecificModuleCache);
341 // Handle generating dependencies, if requested.
342 const DependencyOutputOptions &DepOpts = getDependencyOutputOpts();
343 if (!DepOpts.OutputFile.empty())
344 TheDependencyFileGenerator.reset(
345 DependencyFileGenerator::CreateAndAttachToPreprocessor(*PP, DepOpts));
346 if (!DepOpts.DOTOutputFile.empty())
347 AttachDependencyGraphGen(*PP, DepOpts.DOTOutputFile,
348 getHeaderSearchOpts().Sysroot);
350 for (auto &Listener : DependencyCollectors)
351 Listener->attachToPreprocessor(*PP);
353 // If we don't have a collector, but we are collecting module dependencies,
354 // then we're the top level compiler instance and need to create one.
355 if (!ModuleDepCollector && !DepOpts.ModuleDependencyOutputDir.empty())
356 ModuleDepCollector = std::make_shared<ModuleDependencyCollector>(
357 DepOpts.ModuleDependencyOutputDir);
359 // Handle generating header include information, if requested.
360 if (DepOpts.ShowHeaderIncludes)
361 AttachHeaderIncludeGen(*PP);
362 if (!DepOpts.HeaderIncludeOutputFile.empty()) {
363 StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
364 if (OutputPath == "-")
366 AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/true, OutputPath,
367 /*ShowDepth=*/false);
370 if (DepOpts.PrintShowIncludes) {
371 AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/false, /*OutputPath=*/"",
372 /*ShowDepth=*/true, /*MSStyle=*/true);
378 void CompilerInstance::createASTContext() {
379 Preprocessor &PP = getPreprocessor();
380 Context = new ASTContext(getLangOpts(), PP.getSourceManager(),
381 PP.getIdentifierTable(), PP.getSelectorTable(),
382 PP.getBuiltinInfo());
383 Context->InitBuiltinTypes(getTarget());
388 void CompilerInstance::createPCHExternalASTSource(
389 StringRef Path, bool DisablePCHValidation, bool AllowPCHWithCompilerErrors,
390 void *DeserializationListener, bool OwnDeserializationListener) {
391 IntrusiveRefCntPtr<ExternalASTSource> Source;
392 bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
393 Source = createPCHExternalASTSource(
394 Path, getHeaderSearchOpts().Sysroot, DisablePCHValidation,
395 AllowPCHWithCompilerErrors, getPreprocessor(), getASTContext(),
396 DeserializationListener, OwnDeserializationListener, Preamble,
397 getFrontendOpts().UseGlobalModuleIndex);
398 ModuleManager = static_cast<ASTReader*>(Source.get());
399 getASTContext().setExternalSource(Source);
402 ExternalASTSource *CompilerInstance::createPCHExternalASTSource(
403 StringRef Path, const std::string &Sysroot, bool DisablePCHValidation,
404 bool AllowPCHWithCompilerErrors, Preprocessor &PP, ASTContext &Context,
405 void *DeserializationListener, bool OwnDeserializationListener,
406 bool Preamble, bool UseGlobalModuleIndex) {
407 HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
409 std::unique_ptr<ASTReader> Reader;
410 Reader.reset(new ASTReader(PP, Context,
411 Sysroot.empty() ? "" : Sysroot.c_str(),
412 DisablePCHValidation,
413 AllowPCHWithCompilerErrors,
414 /*AllowConfigurationMismatch*/false,
415 HSOpts.ModulesValidateSystemHeaders,
416 UseGlobalModuleIndex));
418 Reader->setDeserializationListener(
419 static_cast<ASTDeserializationListener *>(DeserializationListener),
420 /*TakeOwnership=*/OwnDeserializationListener);
421 switch (Reader->ReadAST(Path,
422 Preamble ? serialization::MK_Preamble
423 : serialization::MK_PCH,
425 ASTReader::ARR_None)) {
426 case ASTReader::Success:
427 // Set the predefines buffer as suggested by the PCH reader. Typically, the
428 // predefines buffer will be empty.
429 PP.setPredefines(Reader->getSuggestedPredefines());
430 return Reader.release();
432 case ASTReader::Failure:
433 // Unrecoverable failure: don't even try to process the input file.
436 case ASTReader::Missing:
437 case ASTReader::OutOfDate:
438 case ASTReader::VersionMismatch:
439 case ASTReader::ConfigurationMismatch:
440 case ASTReader::HadErrors:
441 // No suitable PCH file could be found. Return an error.
450 static bool EnableCodeCompletion(Preprocessor &PP,
451 const std::string &Filename,
454 // Tell the source manager to chop off the given file at a specific
456 const FileEntry *Entry = PP.getFileManager().getFile(Filename);
458 PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
463 // Truncate the named file at the given line/column.
464 PP.SetCodeCompletionPoint(Entry, Line, Column);
468 void CompilerInstance::createCodeCompletionConsumer() {
469 const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
470 if (!CompletionConsumer) {
471 setCodeCompletionConsumer(
472 createCodeCompletionConsumer(getPreprocessor(),
473 Loc.FileName, Loc.Line, Loc.Column,
474 getFrontendOpts().CodeCompleteOpts,
476 if (!CompletionConsumer)
478 } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
479 Loc.Line, Loc.Column)) {
480 setCodeCompletionConsumer(nullptr);
484 if (CompletionConsumer->isOutputBinary() &&
485 llvm::sys::ChangeStdoutToBinary()) {
486 getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
487 setCodeCompletionConsumer(nullptr);
491 void CompilerInstance::createFrontendTimer() {
492 FrontendTimer.reset(new llvm::Timer("Clang front-end timer"));
495 CodeCompleteConsumer *
496 CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
497 const std::string &Filename,
500 const CodeCompleteOptions &Opts,
502 if (EnableCodeCompletion(PP, Filename, Line, Column))
505 // Set up the creation routine for code-completion.
506 return new PrintingCodeCompleteConsumer(Opts, OS);
509 void CompilerInstance::createSema(TranslationUnitKind TUKind,
510 CodeCompleteConsumer *CompletionConsumer) {
511 TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
512 TUKind, CompletionConsumer));
517 void CompilerInstance::addOutputFile(const OutputFile &OutFile) {
518 assert(OutFile.OS && "Attempt to add empty stream to output list!");
519 OutputFiles.push_back(OutFile);
522 void CompilerInstance::clearOutputFiles(bool EraseFiles) {
523 for (std::list<OutputFile>::iterator
524 it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) {
526 if (!it->TempFilename.empty()) {
528 llvm::sys::fs::remove(it->TempFilename);
530 SmallString<128> NewOutFile(it->Filename);
532 // If '-working-directory' was passed, the output filename should be
534 FileMgr->FixupRelativePath(NewOutFile);
535 if (std::error_code ec =
536 llvm::sys::fs::rename(it->TempFilename, NewOutFile.str())) {
537 getDiagnostics().Report(diag::err_unable_to_rename_temp)
538 << it->TempFilename << it->Filename << ec.message();
540 llvm::sys::fs::remove(it->TempFilename);
543 } else if (!it->Filename.empty() && EraseFiles)
544 llvm::sys::fs::remove(it->Filename);
550 llvm::raw_fd_ostream *
551 CompilerInstance::createDefaultOutputFile(bool Binary,
553 StringRef Extension) {
554 return createOutputFile(getFrontendOpts().OutputFile, Binary,
555 /*RemoveFileOnSignal=*/true, InFile, Extension,
556 /*UseTemporary=*/true);
559 llvm::raw_null_ostream *CompilerInstance::createNullOutputFile() {
560 llvm::raw_null_ostream *OS = new llvm::raw_null_ostream();
561 addOutputFile(OutputFile("", "", OS));
565 llvm::raw_fd_ostream *
566 CompilerInstance::createOutputFile(StringRef OutputPath,
567 bool Binary, bool RemoveFileOnSignal,
571 bool CreateMissingDirectories) {
572 std::string Error, OutputPathName, TempPathName;
573 llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary,
577 CreateMissingDirectories,
581 getDiagnostics().Report(diag::err_fe_unable_to_open_output)
582 << OutputPath << Error;
586 // Add the output file -- but don't try to remove "-", since this means we are
588 addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "",
594 llvm::raw_fd_ostream *
595 CompilerInstance::createOutputFile(StringRef OutputPath,
598 bool RemoveFileOnSignal,
602 bool CreateMissingDirectories,
603 std::string *ResultPathName,
604 std::string *TempPathName) {
605 assert((!CreateMissingDirectories || UseTemporary) &&
606 "CreateMissingDirectories is only allowed when using temporary files");
608 std::string OutFile, TempFile;
609 if (!OutputPath.empty()) {
610 OutFile = OutputPath;
611 } else if (InFile == "-") {
613 } else if (!Extension.empty()) {
614 SmallString<128> Path(InFile);
615 llvm::sys::path::replace_extension(Path, Extension);
616 OutFile = Path.str();
621 std::unique_ptr<llvm::raw_fd_ostream> OS;
626 UseTemporary = false;
628 llvm::sys::fs::file_status Status;
629 llvm::sys::fs::status(OutputPath, Status);
630 if (llvm::sys::fs::exists(Status)) {
631 // Fail early if we can't write to the final destination.
632 if (!llvm::sys::fs::can_write(OutputPath))
635 // Don't use a temporary if the output is a special file. This handles
636 // things like '-o /dev/null'
637 if (!llvm::sys::fs::is_regular_file(Status))
638 UseTemporary = false;
644 // Create a temporary file.
645 SmallString<128> TempPath;
647 TempPath += "-%%%%%%%%";
650 llvm::sys::fs::createUniqueFile(TempPath.str(), fd, TempPath);
652 if (CreateMissingDirectories &&
653 EC == llvm::errc::no_such_file_or_directory) {
654 StringRef Parent = llvm::sys::path::parent_path(OutputPath);
655 EC = llvm::sys::fs::create_directories(Parent);
657 EC = llvm::sys::fs::createUniqueFile(TempPath.str(), fd, TempPath);
662 OS.reset(new llvm::raw_fd_ostream(fd, /*shouldClose=*/true));
663 OSFile = TempFile = TempPath.str();
665 // If we failed to create the temporary, fallback to writing to the file
666 // directly. This handles the corner case where we cannot write to the
667 // directory, but can write to the file.
672 OS.reset(new llvm::raw_fd_ostream(
673 OSFile.c_str(), Error,
674 (Binary ? llvm::sys::fs::F_None : llvm::sys::fs::F_Text)));
679 // Make sure the out stream file gets removed if we crash.
680 if (RemoveFileOnSignal)
681 llvm::sys::RemoveFileOnSignal(OSFile);
684 *ResultPathName = OutFile;
686 *TempPathName = TempFile;
691 // Initialization Utilities
693 bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input){
694 return InitializeSourceManager(Input, getDiagnostics(),
695 getFileManager(), getSourceManager(),
699 bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input,
700 DiagnosticsEngine &Diags,
701 FileManager &FileMgr,
702 SourceManager &SourceMgr,
703 const FrontendOptions &Opts) {
704 SrcMgr::CharacteristicKind
705 Kind = Input.isSystem() ? SrcMgr::C_System : SrcMgr::C_User;
707 if (Input.isBuffer()) {
708 SourceMgr.setMainFileID(SourceMgr.createFileID(Input.getBuffer(), Kind));
709 assert(!SourceMgr.getMainFileID().isInvalid() &&
710 "Couldn't establish MainFileID!");
714 StringRef InputFile = Input.getFile();
716 // Figure out where to get and map in the main file.
717 if (InputFile != "-") {
718 const FileEntry *File = FileMgr.getFile(InputFile, /*OpenFile=*/true);
720 Diags.Report(diag::err_fe_error_reading) << InputFile;
724 // The natural SourceManager infrastructure can't currently handle named
725 // pipes, but we would at least like to accept them for the main
726 // file. Detect them here, read them with the volatile flag so FileMgr will
727 // pick up the correct size, and simply override their contents as we do for
729 if (File->isNamedPipe()) {
730 std::string ErrorStr;
731 if (llvm::MemoryBuffer *MB =
732 FileMgr.getBufferForFile(File, &ErrorStr, /*isVolatile=*/true)) {
733 // Create a new virtual file that will have the correct size.
734 File = FileMgr.getVirtualFile(InputFile, MB->getBufferSize(), 0);
735 SourceMgr.overrideFileContents(File, MB);
737 Diags.Report(diag::err_cannot_open_file) << InputFile << ErrorStr;
742 SourceMgr.setMainFileID(
743 SourceMgr.createFileID(File, SourceLocation(), Kind));
745 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> SBOrErr =
746 llvm::MemoryBuffer::getSTDIN();
747 if (std::error_code EC = SBOrErr.getError()) {
748 Diags.Report(diag::err_fe_error_reading_stdin) << EC.message();
751 std::unique_ptr<llvm::MemoryBuffer> SB = std::move(SBOrErr.get());
753 const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
754 SB->getBufferSize(), 0);
755 SourceMgr.setMainFileID(
756 SourceMgr.createFileID(File, SourceLocation(), Kind));
757 SourceMgr.overrideFileContents(File, SB.release());
760 assert(!SourceMgr.getMainFileID().isInvalid() &&
761 "Couldn't establish MainFileID!");
765 // High-Level Operations
767 bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
768 assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
769 assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
770 assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
772 // FIXME: Take this as an argument, once all the APIs we used have moved to
773 // taking it as an input instead of hard-coding llvm::errs.
774 raw_ostream &OS = llvm::errs();
776 // Create the target instance.
777 setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(),
778 getInvocation().TargetOpts));
782 // Inform the target of the language options.
784 // FIXME: We shouldn't need to do this, the target should be immutable once
785 // created. This complexity should be lifted elsewhere.
786 getTarget().adjust(getLangOpts());
788 // rewriter project will change target built-in bool type from its default.
789 if (getFrontendOpts().ProgramAction == frontend::RewriteObjC)
790 getTarget().noSignedCharForObjCBool();
792 // Validate/process some options.
793 if (getHeaderSearchOpts().Verbose)
794 OS << "clang -cc1 version " CLANG_VERSION_STRING
795 << " based upon " << BACKEND_PACKAGE_STRING
796 << " default target " << llvm::sys::getDefaultTargetTriple() << "\n";
798 if (getFrontendOpts().ShowTimers)
799 createFrontendTimer();
801 if (getFrontendOpts().ShowStats)
802 llvm::EnableStatistics();
804 for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
805 // Reset the ID tables if we are reusing the SourceManager.
806 if (hasSourceManager())
807 getSourceManager().clearIDTables();
809 if (Act.BeginSourceFile(*this, getFrontendOpts().Inputs[i])) {
815 // Notify the diagnostic client that all files were processed.
816 getDiagnostics().getClient()->finish();
818 if (getDiagnosticOpts().ShowCarets) {
819 // We can have multiple diagnostics sharing one diagnostic client.
820 // Get the total number of warnings/errors from the client.
821 unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
822 unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
825 OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
826 if (NumWarnings && NumErrors)
829 OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
830 if (NumWarnings || NumErrors)
831 OS << " generated.\n";
834 if (getFrontendOpts().ShowStats && hasFileManager()) {
835 getFileManager().PrintStats();
839 return !getDiagnostics().getClient()->getNumErrors();
842 /// \brief Determine the appropriate source input kind based on language
844 static InputKind getSourceInputKindFromOptions(const LangOptions &LangOpts) {
850 return LangOpts.CPlusPlus? IK_ObjCXX : IK_ObjC;
851 return LangOpts.CPlusPlus? IK_CXX : IK_C;
854 /// \brief Compile a module file for the given module, using the options
855 /// provided by the importing compiler instance. Returns true if the module
856 /// was built without errors.
857 static bool compileModuleImpl(CompilerInstance &ImportingInstance,
858 SourceLocation ImportLoc,
860 StringRef ModuleFileName) {
862 = ImportingInstance.getPreprocessor().getHeaderSearchInfo().getModuleMap();
864 // Construct a compiler invocation for creating this module.
865 IntrusiveRefCntPtr<CompilerInvocation> Invocation
866 (new CompilerInvocation(ImportingInstance.getInvocation()));
868 PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
870 // For any options that aren't intended to affect how a module is built,
871 // reset them to their default values.
872 Invocation->getLangOpts()->resetNonModularOptions();
873 PPOpts.resetNonModularOptions();
875 // Remove any macro definitions that are explicitly ignored by the module.
876 // They aren't supposed to affect how the module is built anyway.
877 const HeaderSearchOptions &HSOpts = Invocation->getHeaderSearchOpts();
879 std::remove_if(PPOpts.Macros.begin(), PPOpts.Macros.end(),
880 [&HSOpts](const std::pair<std::string, bool> &def) {
881 StringRef MacroDef = def.first;
882 return HSOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first) > 0;
884 PPOpts.Macros.end());
886 // Note the name of the module we're building.
887 Invocation->getLangOpts()->CurrentModule = Module->getTopLevelModuleName();
889 // Make sure that the failed-module structure has been allocated in
890 // the importing instance, and propagate the pointer to the newly-created
892 PreprocessorOptions &ImportingPPOpts
893 = ImportingInstance.getInvocation().getPreprocessorOpts();
894 if (!ImportingPPOpts.FailedModules)
895 ImportingPPOpts.FailedModules = new PreprocessorOptions::FailedModulesSet;
896 PPOpts.FailedModules = ImportingPPOpts.FailedModules;
898 // If there is a module map file, build the module using the module map.
899 // Set up the inputs/outputs so that we build the module from its umbrella
901 FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
902 FrontendOpts.OutputFile = ModuleFileName.str();
903 FrontendOpts.DisableFree = false;
904 FrontendOpts.GenerateGlobalModuleIndex = false;
905 FrontendOpts.Inputs.clear();
906 InputKind IK = getSourceInputKindFromOptions(*Invocation->getLangOpts());
908 // Don't free the remapped file buffers; they are owned by our caller.
909 PPOpts.RetainRemappedFileBuffers = true;
911 Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
912 assert(ImportingInstance.getInvocation().getModuleHash() ==
913 Invocation->getModuleHash() && "Module hash mismatch!");
915 // Construct a compiler instance that will be used to actually create the
917 CompilerInstance Instance(/*BuildingModule=*/true);
918 Instance.setInvocation(&*Invocation);
920 Instance.createDiagnostics(new ForwardingDiagnosticConsumer(
921 ImportingInstance.getDiagnosticClient()),
922 /*ShouldOwnClient=*/true);
924 Instance.setVirtualFileSystem(&ImportingInstance.getVirtualFileSystem());
926 // Note that this module is part of the module build stack, so that we
927 // can detect cycles in the module graph.
928 Instance.setFileManager(&ImportingInstance.getFileManager());
929 Instance.createSourceManager(Instance.getFileManager());
930 SourceManager &SourceMgr = Instance.getSourceManager();
931 SourceMgr.setModuleBuildStack(
932 ImportingInstance.getSourceManager().getModuleBuildStack());
933 SourceMgr.pushModuleBuildStack(Module->getTopLevelModuleName(),
934 FullSourceLoc(ImportLoc, ImportingInstance.getSourceManager()));
936 // If we're collecting module dependencies, we need to share a collector
937 // between all of the module CompilerInstances.
938 Instance.setModuleDepCollector(ImportingInstance.getModuleDepCollector());
940 // Get or create the module map that we'll use to build this module.
941 std::string InferredModuleMapContent;
942 if (const FileEntry *ModuleMapFile =
943 ModMap.getContainingModuleMapFile(Module)) {
944 // Use the module map where this module resides.
945 FrontendOpts.Inputs.push_back(
946 FrontendInputFile(ModuleMapFile->getName(), IK));
948 llvm::raw_string_ostream OS(InferredModuleMapContent);
951 FrontendOpts.Inputs.push_back(
952 FrontendInputFile("__inferred_module.map", IK));
954 llvm::MemoryBuffer *ModuleMapBuffer =
955 llvm::MemoryBuffer::getMemBuffer(InferredModuleMapContent);
956 ModuleMapFile = Instance.getFileManager().getVirtualFile(
957 "__inferred_module.map", InferredModuleMapContent.size(), 0);
958 SourceMgr.overrideFileContents(ModuleMapFile, ModuleMapBuffer);
961 // Construct a module-generating action. Passing through Module->ModuleMap is
962 // safe because the FileManager is shared between the compiler instances.
963 GenerateModuleAction CreateModuleAction(Module->ModuleMap, Module->IsSystem);
965 // Execute the action to actually build the module in-place. Use a separate
966 // thread so that we get a stack large enough.
967 const unsigned ThreadStackSize = 8 << 20;
968 llvm::CrashRecoveryContext CRC;
969 CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(CreateModuleAction); },
972 // Delete the temporary module map file.
973 // FIXME: Even though we're executing under crash protection, it would still
974 // be nice to do this with RemoveFileOnSignal when we can. However, that
975 // doesn't make sense for all clients, so clean this up manually.
976 Instance.clearOutputFiles(/*EraseFiles=*/true);
978 // We've rebuilt a module. If we're allowed to generate or update the global
979 // module index, record that fact in the importing compiler instance.
980 if (ImportingInstance.getFrontendOpts().GenerateGlobalModuleIndex) {
981 ImportingInstance.setBuildGlobalModuleIndex(true);
984 return !Instance.getDiagnostics().hasErrorOccurred();
987 static bool compileAndLoadModule(CompilerInstance &ImportingInstance,
988 SourceLocation ImportLoc,
989 SourceLocation ModuleNameLoc, Module *Module,
990 StringRef ModuleFileName) {
991 auto diagnoseBuildFailure = [&] {
992 ImportingInstance.getDiagnostics().Report(ModuleNameLoc,
993 diag::err_module_not_built)
994 << Module->Name << SourceRange(ImportLoc, ModuleNameLoc);
997 // FIXME: have LockFileManager return an error_code so that we can
998 // avoid the mkdir when the directory already exists.
999 StringRef Dir = llvm::sys::path::parent_path(ModuleFileName);
1000 llvm::sys::fs::create_directories(Dir);
1003 unsigned ModuleLoadCapabilities = ASTReader::ARR_Missing;
1004 llvm::LockFileManager Locked(ModuleFileName);
1006 case llvm::LockFileManager::LFS_Error:
1009 case llvm::LockFileManager::LFS_Owned:
1010 // We're responsible for building the module ourselves.
1011 if (!compileModuleImpl(ImportingInstance, ModuleNameLoc, Module,
1013 diagnoseBuildFailure();
1018 case llvm::LockFileManager::LFS_Shared:
1019 // Someone else is responsible for building the module. Wait for them to
1021 if (Locked.waitForUnlock() == llvm::LockFileManager::Res_OwnerDied)
1022 continue; // try again to get the lock.
1023 ModuleLoadCapabilities |= ASTReader::ARR_OutOfDate;
1027 // Try to read the module file, now that we've compiled it.
1028 ASTReader::ASTReadResult ReadResult =
1029 ImportingInstance.getModuleManager()->ReadAST(
1030 ModuleFileName, serialization::MK_Module, ImportLoc,
1031 ModuleLoadCapabilities);
1033 if (ReadResult == ASTReader::OutOfDate &&
1034 Locked == llvm::LockFileManager::LFS_Shared) {
1035 // The module may be out of date in the presence of file system races,
1036 // or if one of its imports depends on header search paths that are not
1037 // consistent with this ImportingInstance. Try again...
1039 } else if (ReadResult == ASTReader::Missing) {
1040 diagnoseBuildFailure();
1042 return ReadResult == ASTReader::Success;
1046 /// \brief Diagnose differences between the current definition of the given
1047 /// configuration macro and the definition provided on the command line.
1048 static void checkConfigMacro(Preprocessor &PP, StringRef ConfigMacro,
1049 Module *Mod, SourceLocation ImportLoc) {
1050 IdentifierInfo *Id = PP.getIdentifierInfo(ConfigMacro);
1051 SourceManager &SourceMgr = PP.getSourceManager();
1053 // If this identifier has never had a macro definition, then it could
1054 // not have changed.
1055 if (!Id->hadMacroDefinition())
1058 // If this identifier does not currently have a macro definition,
1059 // check whether it had one on the command line.
1060 if (!Id->hasMacroDefinition()) {
1061 MacroDirective::DefInfo LatestDef =
1062 PP.getMacroDirectiveHistory(Id)->getDefinition();
1063 for (MacroDirective::DefInfo Def = LatestDef; Def;
1064 Def = Def.getPreviousDefinition()) {
1065 FileID FID = SourceMgr.getFileID(Def.getLocation());
1066 if (FID.isInvalid())
1069 // We only care about the predefines buffer.
1070 if (FID != PP.getPredefinesFileID())
1073 // This macro was defined on the command line, then #undef'd later.
1075 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1076 << true << ConfigMacro << Mod->getFullModuleName();
1077 if (LatestDef.isUndefined())
1078 PP.Diag(LatestDef.getUndefLocation(), diag::note_module_def_undef_here)
1083 // Okay: no definition in the predefines buffer.
1087 // This identifier has a macro definition. Check whether we had a definition
1088 // on the command line.
1089 MacroDirective::DefInfo LatestDef =
1090 PP.getMacroDirectiveHistory(Id)->getDefinition();
1091 MacroDirective::DefInfo PredefinedDef;
1092 for (MacroDirective::DefInfo Def = LatestDef; Def;
1093 Def = Def.getPreviousDefinition()) {
1094 FileID FID = SourceMgr.getFileID(Def.getLocation());
1095 if (FID.isInvalid())
1098 // We only care about the predefines buffer.
1099 if (FID != PP.getPredefinesFileID())
1102 PredefinedDef = Def;
1106 // If there was no definition for this macro in the predefines buffer,
1108 if (!PredefinedDef ||
1109 (!PredefinedDef.getLocation().isValid() &&
1110 PredefinedDef.getUndefLocation().isValid())) {
1111 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1112 << false << ConfigMacro << Mod->getFullModuleName();
1113 PP.Diag(LatestDef.getLocation(), diag::note_module_def_undef_here)
1118 // If the current macro definition is the same as the predefined macro
1119 // definition, it's okay.
1120 if (LatestDef.getMacroInfo() == PredefinedDef.getMacroInfo() ||
1121 LatestDef.getMacroInfo()->isIdenticalTo(*PredefinedDef.getMacroInfo(),PP,
1122 /*Syntactically=*/true))
1125 // The macro definitions differ.
1126 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1127 << false << ConfigMacro << Mod->getFullModuleName();
1128 PP.Diag(LatestDef.getLocation(), diag::note_module_def_undef_here)
1132 /// \brief Write a new timestamp file with the given path.
1133 static void writeTimestampFile(StringRef TimestampFile) {
1134 std::string ErrorInfo;
1135 llvm::raw_fd_ostream Out(TimestampFile.str().c_str(), ErrorInfo,
1136 llvm::sys::fs::F_None);
1139 /// \brief Prune the module cache of modules that haven't been accessed in
1141 static void pruneModuleCache(const HeaderSearchOptions &HSOpts) {
1142 struct stat StatBuf;
1143 llvm::SmallString<128> TimestampFile;
1144 TimestampFile = HSOpts.ModuleCachePath;
1145 llvm::sys::path::append(TimestampFile, "modules.timestamp");
1147 // Try to stat() the timestamp file.
1148 if (::stat(TimestampFile.c_str(), &StatBuf)) {
1149 // If the timestamp file wasn't there, create one now.
1150 if (errno == ENOENT) {
1151 writeTimestampFile(TimestampFile);
1156 // Check whether the time stamp is older than our pruning interval.
1157 // If not, do nothing.
1158 time_t TimeStampModTime = StatBuf.st_mtime;
1159 time_t CurrentTime = time(nullptr);
1160 if (CurrentTime - TimeStampModTime <= time_t(HSOpts.ModuleCachePruneInterval))
1163 // Write a new timestamp file so that nobody else attempts to prune.
1164 // There is a benign race condition here, if two Clang instances happen to
1165 // notice at the same time that the timestamp is out-of-date.
1166 writeTimestampFile(TimestampFile);
1168 // Walk the entire module cache, looking for unused module files and module
1171 SmallString<128> ModuleCachePathNative;
1172 llvm::sys::path::native(HSOpts.ModuleCachePath, ModuleCachePathNative);
1173 for (llvm::sys::fs::directory_iterator
1174 Dir(ModuleCachePathNative.str(), EC), DirEnd;
1175 Dir != DirEnd && !EC; Dir.increment(EC)) {
1176 // If we don't have a directory, there's nothing to look into.
1177 if (!llvm::sys::fs::is_directory(Dir->path()))
1180 // Walk all of the files within this directory.
1181 for (llvm::sys::fs::directory_iterator File(Dir->path(), EC), FileEnd;
1182 File != FileEnd && !EC; File.increment(EC)) {
1183 // We only care about module and global module index files.
1184 StringRef Extension = llvm::sys::path::extension(File->path());
1185 if (Extension != ".pcm" && Extension != ".timestamp" &&
1186 llvm::sys::path::filename(File->path()) != "modules.idx")
1189 // Look at this file. If we can't stat it, there's nothing interesting
1191 if (::stat(File->path().c_str(), &StatBuf))
1194 // If the file has been used recently enough, leave it there.
1195 time_t FileAccessTime = StatBuf.st_atime;
1196 if (CurrentTime - FileAccessTime <=
1197 time_t(HSOpts.ModuleCachePruneAfter)) {
1202 llvm::sys::fs::remove(File->path());
1204 // Remove the timestamp file.
1205 std::string TimpestampFilename = File->path() + ".timestamp";
1206 llvm::sys::fs::remove(TimpestampFilename);
1209 // If we removed all of the files in the directory, remove the directory
1211 if (llvm::sys::fs::directory_iterator(Dir->path(), EC) ==
1212 llvm::sys::fs::directory_iterator() && !EC)
1213 llvm::sys::fs::remove(Dir->path());
1217 void CompilerInstance::createModuleManager() {
1218 if (!ModuleManager) {
1219 if (!hasASTContext())
1222 // If we're not recursively building a module, check whether we
1223 // need to prune the module cache.
1224 if (getSourceManager().getModuleBuildStack().empty() &&
1225 getHeaderSearchOpts().ModuleCachePruneInterval > 0 &&
1226 getHeaderSearchOpts().ModuleCachePruneAfter > 0) {
1227 pruneModuleCache(getHeaderSearchOpts());
1230 HeaderSearchOptions &HSOpts = getHeaderSearchOpts();
1231 std::string Sysroot = HSOpts.Sysroot;
1232 const PreprocessorOptions &PPOpts = getPreprocessorOpts();
1233 ModuleManager = new ASTReader(getPreprocessor(), *Context,
1234 Sysroot.empty() ? "" : Sysroot.c_str(),
1235 PPOpts.DisablePCHValidation,
1236 /*AllowASTWithCompilerErrors=*/false,
1237 /*AllowConfigurationMismatch=*/false,
1238 HSOpts.ModulesValidateSystemHeaders,
1239 getFrontendOpts().UseGlobalModuleIndex);
1240 if (hasASTConsumer()) {
1241 ModuleManager->setDeserializationListener(
1242 getASTConsumer().GetASTDeserializationListener());
1243 getASTContext().setASTMutationListener(
1244 getASTConsumer().GetASTMutationListener());
1246 getASTContext().setExternalSource(ModuleManager);
1248 ModuleManager->InitializeSema(getSema());
1249 if (hasASTConsumer())
1250 ModuleManager->StartTranslationUnit(&getASTConsumer());
1255 CompilerInstance::loadModule(SourceLocation ImportLoc,
1257 Module::NameVisibilityKind Visibility,
1258 bool IsInclusionDirective) {
1259 // Determine what file we're searching from.
1260 StringRef ModuleName = Path[0].first->getName();
1261 SourceLocation ModuleNameLoc = Path[0].second;
1263 // If we've already handled this import, just return the cached result.
1264 // This one-element cache is important to eliminate redundant diagnostics
1265 // when both the preprocessor and parser see the same import declaration.
1266 if (!ImportLoc.isInvalid() && LastModuleImportLoc == ImportLoc) {
1267 // Make the named module visible.
1268 if (LastModuleImportResult && ModuleName != getLangOpts().CurrentModule)
1269 ModuleManager->makeModuleVisible(LastModuleImportResult, Visibility,
1270 ImportLoc, /*Complain=*/false);
1271 return LastModuleImportResult;
1274 clang::Module *Module = nullptr;
1276 // If we don't already have information on this module, load the module now.
1277 llvm::DenseMap<const IdentifierInfo *, clang::Module *>::iterator Known
1278 = KnownModules.find(Path[0].first);
1279 if (Known != KnownModules.end()) {
1280 // Retrieve the cached top-level module.
1281 Module = Known->second;
1282 } else if (ModuleName == getLangOpts().CurrentModule) {
1283 // This is the module we're building.
1284 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1285 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first;
1287 // Search for a module with the given name.
1288 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1290 getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_found)
1292 << SourceRange(ImportLoc, ModuleNameLoc);
1293 ModuleBuildFailed = true;
1294 return ModuleLoadResult();
1297 std::string ModuleFileName =
1298 PP->getHeaderSearchInfo().getModuleFileName(Module);
1300 // If we don't already have an ASTReader, create one now.
1302 createModuleManager();
1304 if (TheDependencyFileGenerator)
1305 TheDependencyFileGenerator->AttachToASTReader(*ModuleManager);
1307 if (ModuleDepCollector)
1308 ModuleDepCollector->attachToASTReader(*ModuleManager);
1310 for (auto &Listener : DependencyCollectors)
1311 Listener->attachToASTReader(*ModuleManager);
1313 // Try to load the module file.
1314 unsigned ARRFlags = ASTReader::ARR_OutOfDate | ASTReader::ARR_Missing;
1315 switch (ModuleManager->ReadAST(ModuleFileName, serialization::MK_Module,
1316 ImportLoc, ARRFlags)) {
1317 case ASTReader::Success:
1320 case ASTReader::OutOfDate:
1321 case ASTReader::Missing: {
1322 // The module file is missing or out-of-date. Build it.
1323 assert(Module && "missing module file");
1324 // Check whether there is a cycle in the module graph.
1325 ModuleBuildStack ModPath = getSourceManager().getModuleBuildStack();
1326 ModuleBuildStack::iterator Pos = ModPath.begin(), PosEnd = ModPath.end();
1327 for (; Pos != PosEnd; ++Pos) {
1328 if (Pos->first == ModuleName)
1332 if (Pos != PosEnd) {
1333 SmallString<256> CyclePath;
1334 for (; Pos != PosEnd; ++Pos) {
1335 CyclePath += Pos->first;
1336 CyclePath += " -> ";
1338 CyclePath += ModuleName;
1340 getDiagnostics().Report(ModuleNameLoc, diag::err_module_cycle)
1341 << ModuleName << CyclePath;
1342 return ModuleLoadResult();
1345 getDiagnostics().Report(ImportLoc, diag::remark_module_build)
1346 << ModuleName << ModuleFileName;
1348 // Check whether we have already attempted to build this module (but
1350 if (getPreprocessorOpts().FailedModules &&
1351 getPreprocessorOpts().FailedModules->hasAlreadyFailed(ModuleName)) {
1352 getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_built)
1354 << SourceRange(ImportLoc, ModuleNameLoc);
1355 ModuleBuildFailed = true;
1356 return ModuleLoadResult();
1359 // Try to compile and then load the module.
1360 if (!compileAndLoadModule(*this, ImportLoc, ModuleNameLoc, Module,
1362 if (getPreprocessorOpts().FailedModules)
1363 getPreprocessorOpts().FailedModules->addFailed(ModuleName);
1364 KnownModules[Path[0].first] = nullptr;
1365 ModuleBuildFailed = true;
1366 return ModuleLoadResult();
1369 // Okay, we've rebuilt and now loaded the module.
1373 case ASTReader::VersionMismatch:
1374 case ASTReader::ConfigurationMismatch:
1375 case ASTReader::HadErrors:
1376 ModuleLoader::HadFatalFailure = true;
1377 // FIXME: The ASTReader will already have complained, but can we showhorn
1378 // that diagnostic information into a more useful form?
1379 KnownModules[Path[0].first] = nullptr;
1380 return ModuleLoadResult();
1382 case ASTReader::Failure:
1383 ModuleLoader::HadFatalFailure = true;
1384 // Already complained, but note now that we failed.
1385 KnownModules[Path[0].first] = nullptr;
1386 ModuleBuildFailed = true;
1387 return ModuleLoadResult();
1390 // Cache the result of this top-level module lookup for later.
1391 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first;
1394 // If we never found the module, fail.
1396 return ModuleLoadResult();
1398 // Verify that the rest of the module path actually corresponds to
1400 if (Path.size() > 1) {
1401 for (unsigned I = 1, N = Path.size(); I != N; ++I) {
1402 StringRef Name = Path[I].first->getName();
1403 clang::Module *Sub = Module->findSubmodule(Name);
1406 // Attempt to perform typo correction to find a module name that works.
1407 SmallVector<StringRef, 2> Best;
1408 unsigned BestEditDistance = (std::numeric_limits<unsigned>::max)();
1410 for (clang::Module::submodule_iterator J = Module->submodule_begin(),
1411 JEnd = Module->submodule_end();
1413 unsigned ED = Name.edit_distance((*J)->Name,
1414 /*AllowReplacements=*/true,
1416 if (ED <= BestEditDistance) {
1417 if (ED < BestEditDistance) {
1419 BestEditDistance = ED;
1422 Best.push_back((*J)->Name);
1426 // If there was a clear winner, user it.
1427 if (Best.size() == 1) {
1428 getDiagnostics().Report(Path[I].second,
1429 diag::err_no_submodule_suggest)
1430 << Path[I].first << Module->getFullModuleName() << Best[0]
1431 << SourceRange(Path[0].second, Path[I-1].second)
1432 << FixItHint::CreateReplacement(SourceRange(Path[I].second),
1435 Sub = Module->findSubmodule(Best[0]);
1440 // No submodule by this name. Complain, and don't look for further
1442 getDiagnostics().Report(Path[I].second, diag::err_no_submodule)
1443 << Path[I].first << Module->getFullModuleName()
1444 << SourceRange(Path[0].second, Path[I-1].second);
1452 // Make the named module visible, if it's not already part of the module
1454 if (ModuleName != getLangOpts().CurrentModule) {
1455 if (!Module->IsFromModuleFile) {
1456 // We have an umbrella header or directory that doesn't actually include
1457 // all of the headers within the directory it covers. Complain about
1458 // this missing submodule and recover by forgetting that we ever saw
1460 // FIXME: Should we detect this at module load time? It seems fairly
1461 // expensive (and rare).
1462 getDiagnostics().Report(ImportLoc, diag::warn_missing_submodule)
1463 << Module->getFullModuleName()
1464 << SourceRange(Path.front().second, Path.back().second);
1466 return ModuleLoadResult(nullptr, true);
1469 // Check whether this module is available.
1470 clang::Module::Requirement Requirement;
1471 clang::Module::HeaderDirective MissingHeader;
1472 if (!Module->isAvailable(getLangOpts(), getTarget(), Requirement,
1474 if (MissingHeader.FileNameLoc.isValid()) {
1475 getDiagnostics().Report(MissingHeader.FileNameLoc,
1476 diag::err_module_header_missing)
1477 << MissingHeader.IsUmbrella << MissingHeader.FileName;
1479 getDiagnostics().Report(ImportLoc, diag::err_module_unavailable)
1480 << Module->getFullModuleName()
1481 << Requirement.second << Requirement.first
1482 << SourceRange(Path.front().second, Path.back().second);
1484 LastModuleImportLoc = ImportLoc;
1485 LastModuleImportResult = ModuleLoadResult();
1486 return ModuleLoadResult();
1489 ModuleManager->makeModuleVisible(Module, Visibility, ImportLoc,
1493 // Check for any configuration macros that have changed.
1494 clang::Module *TopModule = Module->getTopLevelModule();
1495 for (unsigned I = 0, N = TopModule->ConfigMacros.size(); I != N; ++I) {
1496 checkConfigMacro(getPreprocessor(), TopModule->ConfigMacros[I],
1500 // If this module import was due to an inclusion directive, create an
1501 // implicit import declaration to capture it in the AST.
1502 if (IsInclusionDirective && hasASTContext()) {
1503 TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
1504 ImportDecl *ImportD = ImportDecl::CreateImplicit(getASTContext(), TU,
1506 Path.back().second);
1507 TU->addDecl(ImportD);
1509 Consumer->HandleImplicitImportDecl(ImportD);
1512 LastModuleImportLoc = ImportLoc;
1513 LastModuleImportResult = ModuleLoadResult(Module, false);
1514 return LastModuleImportResult;
1517 void CompilerInstance::makeModuleVisible(Module *Mod,
1518 Module::NameVisibilityKind Visibility,
1519 SourceLocation ImportLoc,
1521 ModuleManager->makeModuleVisible(Mod, Visibility, ImportLoc, Complain);
1524 GlobalModuleIndex *CompilerInstance::loadGlobalModuleIndex(
1525 SourceLocation TriggerLoc) {
1527 createModuleManager();
1528 // Can't do anything if we don't have the module manager.
1531 // Get an existing global index. This loads it if not already
1533 ModuleManager->loadGlobalIndex();
1534 GlobalModuleIndex *GlobalIndex = ModuleManager->getGlobalIndex();
1535 // If the global index doesn't exist, create it.
1536 if (!GlobalIndex && shouldBuildGlobalModuleIndex() && hasFileManager() &&
1537 hasPreprocessor()) {
1538 llvm::sys::fs::create_directories(
1539 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1540 GlobalModuleIndex::writeIndex(
1542 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1543 ModuleManager->resetForReload();
1544 ModuleManager->loadGlobalIndex();
1545 GlobalIndex = ModuleManager->getGlobalIndex();
1547 // For finding modules needing to be imported for fixit messages,
1548 // we need to make the global index cover all modules, so we do that here.
1549 if (!HaveFullGlobalModuleIndex && GlobalIndex && !buildingModule()) {
1550 ModuleMap &MMap = getPreprocessor().getHeaderSearchInfo().getModuleMap();
1551 bool RecreateIndex = false;
1552 for (ModuleMap::module_iterator I = MMap.module_begin(),
1553 E = MMap.module_end(); I != E; ++I) {
1554 Module *TheModule = I->second;
1555 const FileEntry *Entry = TheModule->getASTFile();
1557 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1558 Path.push_back(std::make_pair(
1559 getPreprocessor().getIdentifierInfo(TheModule->Name), TriggerLoc));
1560 std::reverse(Path.begin(), Path.end());
1561 // Load a module as hidden. This also adds it to the global index.
1562 loadModule(TheModule->DefinitionLoc, Path,
1563 Module::Hidden, false);
1564 RecreateIndex = true;
1567 if (RecreateIndex) {
1568 GlobalModuleIndex::writeIndex(
1570 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1571 ModuleManager->resetForReload();
1572 ModuleManager->loadGlobalIndex();
1573 GlobalIndex = ModuleManager->getGlobalIndex();
1575 HaveFullGlobalModuleIndex = true;
1580 // Check global module index for missing imports.
1582 CompilerInstance::lookupMissingImports(StringRef Name,
1583 SourceLocation TriggerLoc) {
1584 // Look for the symbol in non-imported modules, but only if an error
1585 // actually occurred.
1586 if (!buildingModule()) {
1587 // Load global module index, or retrieve a previously loaded one.
1588 GlobalModuleIndex *GlobalIndex = loadGlobalModuleIndex(
1591 // Only if we have a global index.
1593 GlobalModuleIndex::HitSet FoundModules;
1595 // Find the modules that reference the identifier.
1596 // Note that this only finds top-level modules.
1597 // We'll let diagnoseTypo find the actual declaration module.
1598 if (GlobalIndex->lookupIdentifier(Name, FoundModules))