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(
55 std::shared_ptr<PCHContainerOperations> PCHContainerOps,
57 : ModuleLoader(BuildingModule), Invocation(new CompilerInvocation()),
58 ModuleManager(nullptr), ThePCHContainerOperations(PCHContainerOps),
59 BuildGlobalModuleIndex(false), HaveFullGlobalModuleIndex(false),
60 ModuleBuildFailed(false) {}
62 CompilerInstance::~CompilerInstance() {
63 assert(OutputFiles.empty() && "Still output files in flight?");
66 void CompilerInstance::setInvocation(CompilerInvocation *Value) {
70 bool CompilerInstance::shouldBuildGlobalModuleIndex() const {
71 return (BuildGlobalModuleIndex ||
72 (ModuleManager && ModuleManager->isGlobalIndexUnavailable() &&
73 getFrontendOpts().GenerateGlobalModuleIndex)) &&
77 void CompilerInstance::setDiagnostics(DiagnosticsEngine *Value) {
81 void CompilerInstance::setTarget(TargetInfo *Value) {
85 void CompilerInstance::setFileManager(FileManager *Value) {
88 VirtualFileSystem = Value->getVirtualFileSystem();
90 VirtualFileSystem.reset();
93 void CompilerInstance::setSourceManager(SourceManager *Value) {
97 void CompilerInstance::setPreprocessor(Preprocessor *Value) { PP = Value; }
99 void CompilerInstance::setASTContext(ASTContext *Value) { Context = Value; }
101 void CompilerInstance::setSema(Sema *S) {
105 void CompilerInstance::setASTConsumer(std::unique_ptr<ASTConsumer> Value) {
106 Consumer = std::move(Value);
109 void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
110 CompletionConsumer.reset(Value);
113 std::unique_ptr<Sema> CompilerInstance::takeSema() {
114 return std::move(TheSema);
117 IntrusiveRefCntPtr<ASTReader> CompilerInstance::getModuleManager() const {
118 return ModuleManager;
120 void CompilerInstance::setModuleManager(IntrusiveRefCntPtr<ASTReader> Reader) {
121 ModuleManager = Reader;
124 std::shared_ptr<ModuleDependencyCollector>
125 CompilerInstance::getModuleDepCollector() const {
126 return ModuleDepCollector;
129 void CompilerInstance::setModuleDepCollector(
130 std::shared_ptr<ModuleDependencyCollector> Collector) {
131 ModuleDepCollector = Collector;
135 static void SetUpDiagnosticLog(DiagnosticOptions *DiagOpts,
136 const CodeGenOptions *CodeGenOpts,
137 DiagnosticsEngine &Diags) {
139 std::unique_ptr<raw_ostream> StreamOwner;
140 raw_ostream *OS = &llvm::errs();
141 if (DiagOpts->DiagnosticLogFile != "-") {
142 // Create the output stream.
143 auto FileOS = llvm::make_unique<llvm::raw_fd_ostream>(
144 DiagOpts->DiagnosticLogFile, EC,
145 llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
147 Diags.Report(diag::warn_fe_cc_log_diagnostics_failure)
148 << DiagOpts->DiagnosticLogFile << EC.message();
150 FileOS->SetUnbuffered();
151 FileOS->SetUseAtomicWrites(true);
153 StreamOwner = std::move(FileOS);
157 // Chain in the diagnostic client which will log the diagnostics.
158 auto Logger = llvm::make_unique<LogDiagnosticPrinter>(*OS, DiagOpts,
159 std::move(StreamOwner));
161 Logger->setDwarfDebugFlags(CodeGenOpts->DwarfDebugFlags);
162 assert(Diags.ownsClient());
164 new ChainedDiagnosticConsumer(Diags.takeClient(), std::move(Logger)));
167 static void SetupSerializedDiagnostics(DiagnosticOptions *DiagOpts,
168 DiagnosticsEngine &Diags,
169 StringRef OutputFile) {
170 auto SerializedConsumer =
171 clang::serialized_diags::create(OutputFile, DiagOpts);
173 if (Diags.ownsClient()) {
174 Diags.setClient(new ChainedDiagnosticConsumer(
175 Diags.takeClient(), std::move(SerializedConsumer)));
177 Diags.setClient(new ChainedDiagnosticConsumer(
178 Diags.getClient(), std::move(SerializedConsumer)));
182 void CompilerInstance::createDiagnostics(DiagnosticConsumer *Client,
183 bool ShouldOwnClient) {
184 Diagnostics = createDiagnostics(&getDiagnosticOpts(), Client,
185 ShouldOwnClient, &getCodeGenOpts());
188 IntrusiveRefCntPtr<DiagnosticsEngine>
189 CompilerInstance::createDiagnostics(DiagnosticOptions *Opts,
190 DiagnosticConsumer *Client,
191 bool ShouldOwnClient,
192 const CodeGenOptions *CodeGenOpts) {
193 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
194 IntrusiveRefCntPtr<DiagnosticsEngine>
195 Diags(new DiagnosticsEngine(DiagID, Opts));
197 // Create the diagnostic client for reporting errors or for
198 // implementing -verify.
200 Diags->setClient(Client, ShouldOwnClient);
202 Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
204 // Chain in -verify checker, if requested.
205 if (Opts->VerifyDiagnostics)
206 Diags->setClient(new VerifyDiagnosticConsumer(*Diags));
208 // Chain in -diagnostic-log-file dumper, if requested.
209 if (!Opts->DiagnosticLogFile.empty())
210 SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags);
212 if (!Opts->DiagnosticSerializationFile.empty())
213 SetupSerializedDiagnostics(Opts, *Diags,
214 Opts->DiagnosticSerializationFile);
216 // Configure our handling of diagnostics.
217 ProcessWarningOptions(*Diags, *Opts);
224 void CompilerInstance::createFileManager() {
225 if (!hasVirtualFileSystem()) {
226 // TODO: choose the virtual file system based on the CompilerInvocation.
227 setVirtualFileSystem(vfs::getRealFileSystem());
229 FileMgr = new FileManager(getFileSystemOpts(), VirtualFileSystem);
234 void CompilerInstance::createSourceManager(FileManager &FileMgr) {
235 SourceMgr = new SourceManager(getDiagnostics(), FileMgr);
238 // Initialize the remapping of files to alternative contents, e.g.,
239 // those specified through other files.
240 static void InitializeFileRemapping(DiagnosticsEngine &Diags,
241 SourceManager &SourceMgr,
242 FileManager &FileMgr,
243 const PreprocessorOptions &InitOpts) {
244 // Remap files in the source manager (with buffers).
245 for (const auto &RB : InitOpts.RemappedFileBuffers) {
246 // Create the file entry for the file that we're mapping from.
247 const FileEntry *FromFile =
248 FileMgr.getVirtualFile(RB.first, RB.second->getBufferSize(), 0);
250 Diags.Report(diag::err_fe_remap_missing_from_file) << RB.first;
251 if (!InitOpts.RetainRemappedFileBuffers)
256 // Override the contents of the "from" file with the contents of
258 SourceMgr.overrideFileContents(FromFile, RB.second,
259 InitOpts.RetainRemappedFileBuffers);
262 // Remap files in the source manager (with other files).
263 for (const auto &RF : InitOpts.RemappedFiles) {
264 // Find the file that we're mapping to.
265 const FileEntry *ToFile = FileMgr.getFile(RF.second);
267 Diags.Report(diag::err_fe_remap_missing_to_file) << RF.first << RF.second;
271 // Create the file entry for the file that we're mapping from.
272 const FileEntry *FromFile =
273 FileMgr.getVirtualFile(RF.first, ToFile->getSize(), 0);
275 Diags.Report(diag::err_fe_remap_missing_from_file) << RF.first;
279 // Override the contents of the "from" file with the contents of
281 SourceMgr.overrideFileContents(FromFile, ToFile);
284 SourceMgr.setOverridenFilesKeepOriginalName(
285 InitOpts.RemappedFilesKeepOriginalName);
290 void CompilerInstance::createPreprocessor(TranslationUnitKind TUKind) {
291 const PreprocessorOptions &PPOpts = getPreprocessorOpts();
293 // Create a PTH manager if we are using some form of a token cache.
294 PTHManager *PTHMgr = nullptr;
295 if (!PPOpts.TokenCache.empty())
296 PTHMgr = PTHManager::Create(PPOpts.TokenCache, getDiagnostics());
298 // Create the Preprocessor.
299 HeaderSearch *HeaderInfo = new HeaderSearch(&getHeaderSearchOpts(),
304 PP = new Preprocessor(&getPreprocessorOpts(), getDiagnostics(), getLangOpts(),
305 getSourceManager(), *HeaderInfo, *this, PTHMgr,
306 /*OwnsHeaderSearch=*/true, TUKind);
307 PP->Initialize(getTarget());
309 // Note that this is different then passing PTHMgr to Preprocessor's ctor.
310 // That argument is used as the IdentifierInfoLookup argument to
311 // IdentifierTable's ctor.
313 PTHMgr->setPreprocessor(&*PP);
314 PP->setPTHManager(PTHMgr);
317 if (PPOpts.DetailedRecord)
318 PP->createPreprocessingRecord();
320 // Apply remappings to the source manager.
321 InitializeFileRemapping(PP->getDiagnostics(), PP->getSourceManager(),
322 PP->getFileManager(), PPOpts);
324 // Predefine macros and configure the preprocessor.
325 InitializePreprocessor(*PP, PPOpts, getPCHContainerReader(),
328 // Initialize the header search object.
329 ApplyHeaderSearchOptions(PP->getHeaderSearchInfo(), getHeaderSearchOpts(),
330 PP->getLangOpts(), PP->getTargetInfo().getTriple());
332 PP->setPreprocessedOutput(getPreprocessorOutputOpts().ShowCPP);
334 if (PP->getLangOpts().Modules)
335 PP->getHeaderSearchInfo().setModuleCachePath(getSpecificModuleCachePath());
337 // Handle generating dependencies, if requested.
338 const DependencyOutputOptions &DepOpts = getDependencyOutputOpts();
339 if (!DepOpts.OutputFile.empty())
340 TheDependencyFileGenerator.reset(
341 DependencyFileGenerator::CreateAndAttachToPreprocessor(*PP, DepOpts));
342 if (!DepOpts.DOTOutputFile.empty())
343 AttachDependencyGraphGen(*PP, DepOpts.DOTOutputFile,
344 getHeaderSearchOpts().Sysroot);
346 for (auto &Listener : DependencyCollectors)
347 Listener->attachToPreprocessor(*PP);
349 // If we don't have a collector, but we are collecting module dependencies,
350 // then we're the top level compiler instance and need to create one.
351 if (!ModuleDepCollector && !DepOpts.ModuleDependencyOutputDir.empty())
352 ModuleDepCollector = std::make_shared<ModuleDependencyCollector>(
353 DepOpts.ModuleDependencyOutputDir);
355 // Handle generating header include information, if requested.
356 if (DepOpts.ShowHeaderIncludes)
357 AttachHeaderIncludeGen(*PP);
358 if (!DepOpts.HeaderIncludeOutputFile.empty()) {
359 StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
360 if (OutputPath == "-")
362 AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/true, OutputPath,
363 /*ShowDepth=*/false);
366 if (DepOpts.PrintShowIncludes) {
367 AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/false, /*OutputPath=*/"",
368 /*ShowDepth=*/true, /*MSStyle=*/true);
372 std::string CompilerInstance::getSpecificModuleCachePath() {
373 // Set up the module path, including the hash for the
374 // module-creation options.
375 SmallString<256> SpecificModuleCache(
376 getHeaderSearchOpts().ModuleCachePath);
377 if (!getHeaderSearchOpts().DisableModuleHash)
378 llvm::sys::path::append(SpecificModuleCache,
379 getInvocation().getModuleHash());
380 return SpecificModuleCache.str();
385 void CompilerInstance::createASTContext() {
386 Preprocessor &PP = getPreprocessor();
387 Context = new ASTContext(getLangOpts(), PP.getSourceManager(),
388 PP.getIdentifierTable(), PP.getSelectorTable(),
389 PP.getBuiltinInfo());
390 Context->InitBuiltinTypes(getTarget());
395 void CompilerInstance::createPCHExternalASTSource(
396 StringRef Path, bool DisablePCHValidation, bool AllowPCHWithCompilerErrors,
397 void *DeserializationListener, bool OwnDeserializationListener) {
398 bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
399 ModuleManager = createPCHExternalASTSource(
400 Path, getHeaderSearchOpts().Sysroot, DisablePCHValidation,
401 AllowPCHWithCompilerErrors, getPreprocessor(), getASTContext(),
402 getPCHContainerReader(), DeserializationListener,
403 OwnDeserializationListener, Preamble,
404 getFrontendOpts().UseGlobalModuleIndex);
407 IntrusiveRefCntPtr<ASTReader> CompilerInstance::createPCHExternalASTSource(
408 StringRef Path, StringRef Sysroot, bool DisablePCHValidation,
409 bool AllowPCHWithCompilerErrors, Preprocessor &PP, ASTContext &Context,
410 const PCHContainerReader &PCHContainerRdr,
411 void *DeserializationListener, bool OwnDeserializationListener,
412 bool Preamble, bool UseGlobalModuleIndex) {
413 HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
415 IntrusiveRefCntPtr<ASTReader> Reader(new ASTReader(
416 PP, Context, PCHContainerRdr, Sysroot.empty() ? "" : Sysroot.data(),
417 DisablePCHValidation, AllowPCHWithCompilerErrors,
418 /*AllowConfigurationMismatch*/ false, HSOpts.ModulesValidateSystemHeaders,
419 UseGlobalModuleIndex));
421 // We need the external source to be set up before we read the AST, because
422 // eagerly-deserialized declarations may use it.
423 Context.setExternalSource(Reader.get());
425 Reader->setDeserializationListener(
426 static_cast<ASTDeserializationListener *>(DeserializationListener),
427 /*TakeOwnership=*/OwnDeserializationListener);
428 switch (Reader->ReadAST(Path,
429 Preamble ? serialization::MK_Preamble
430 : serialization::MK_PCH,
432 ASTReader::ARR_None)) {
433 case ASTReader::Success:
434 // Set the predefines buffer as suggested by the PCH reader. Typically, the
435 // predefines buffer will be empty.
436 PP.setPredefines(Reader->getSuggestedPredefines());
439 case ASTReader::Failure:
440 // Unrecoverable failure: don't even try to process the input file.
443 case ASTReader::Missing:
444 case ASTReader::OutOfDate:
445 case ASTReader::VersionMismatch:
446 case ASTReader::ConfigurationMismatch:
447 case ASTReader::HadErrors:
448 // No suitable PCH file could be found. Return an error.
452 Context.setExternalSource(nullptr);
458 static bool EnableCodeCompletion(Preprocessor &PP,
459 const std::string &Filename,
462 // Tell the source manager to chop off the given file at a specific
464 const FileEntry *Entry = PP.getFileManager().getFile(Filename);
466 PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
471 // Truncate the named file at the given line/column.
472 PP.SetCodeCompletionPoint(Entry, Line, Column);
476 void CompilerInstance::createCodeCompletionConsumer() {
477 const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
478 if (!CompletionConsumer) {
479 setCodeCompletionConsumer(
480 createCodeCompletionConsumer(getPreprocessor(),
481 Loc.FileName, Loc.Line, Loc.Column,
482 getFrontendOpts().CodeCompleteOpts,
484 if (!CompletionConsumer)
486 } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
487 Loc.Line, Loc.Column)) {
488 setCodeCompletionConsumer(nullptr);
492 if (CompletionConsumer->isOutputBinary() &&
493 llvm::sys::ChangeStdoutToBinary()) {
494 getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
495 setCodeCompletionConsumer(nullptr);
499 void CompilerInstance::createFrontendTimer() {
500 FrontendTimerGroup.reset(new llvm::TimerGroup("Clang front-end time report"));
502 new llvm::Timer("Clang front-end timer", *FrontendTimerGroup));
505 CodeCompleteConsumer *
506 CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
510 const CodeCompleteOptions &Opts,
512 if (EnableCodeCompletion(PP, Filename, Line, Column))
515 // Set up the creation routine for code-completion.
516 return new PrintingCodeCompleteConsumer(Opts, OS);
519 void CompilerInstance::createSema(TranslationUnitKind TUKind,
520 CodeCompleteConsumer *CompletionConsumer) {
521 TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
522 TUKind, CompletionConsumer));
527 void CompilerInstance::addOutputFile(OutputFile &&OutFile) {
528 assert(OutFile.OS && "Attempt to add empty stream to output list!");
529 OutputFiles.push_back(std::move(OutFile));
532 void CompilerInstance::clearOutputFiles(bool EraseFiles) {
533 for (OutputFile &OF : OutputFiles) {
534 // Manually close the stream before we rename it.
537 if (!OF.TempFilename.empty()) {
539 llvm::sys::fs::remove(OF.TempFilename);
541 SmallString<128> NewOutFile(OF.Filename);
543 // If '-working-directory' was passed, the output filename should be
545 FileMgr->FixupRelativePath(NewOutFile);
546 if (std::error_code ec =
547 llvm::sys::fs::rename(OF.TempFilename, NewOutFile)) {
548 getDiagnostics().Report(diag::err_unable_to_rename_temp)
549 << OF.TempFilename << OF.Filename << ec.message();
551 llvm::sys::fs::remove(OF.TempFilename);
554 } else if (!OF.Filename.empty() && EraseFiles)
555 llvm::sys::fs::remove(OF.Filename);
559 NonSeekStream.reset();
563 CompilerInstance::createDefaultOutputFile(bool Binary, StringRef InFile,
564 StringRef Extension) {
565 return createOutputFile(getFrontendOpts().OutputFile, Binary,
566 /*RemoveFileOnSignal=*/true, InFile, Extension,
567 /*UseTemporary=*/true);
570 llvm::raw_null_ostream *CompilerInstance::createNullOutputFile() {
571 auto OS = llvm::make_unique<llvm::raw_null_ostream>();
572 llvm::raw_null_ostream *Ret = OS.get();
573 addOutputFile(OutputFile("", "", std::move(OS)));
578 CompilerInstance::createOutputFile(StringRef OutputPath, bool Binary,
579 bool RemoveFileOnSignal, StringRef InFile,
580 StringRef Extension, bool UseTemporary,
581 bool CreateMissingDirectories) {
582 std::string OutputPathName, TempPathName;
584 std::unique_ptr<raw_pwrite_stream> OS = createOutputFile(
585 OutputPath, EC, Binary, RemoveFileOnSignal, InFile, Extension,
586 UseTemporary, CreateMissingDirectories, &OutputPathName, &TempPathName);
588 getDiagnostics().Report(diag::err_fe_unable_to_open_output) << OutputPath
593 raw_pwrite_stream *Ret = OS.get();
594 // Add the output file -- but don't try to remove "-", since this means we are
596 addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "",
597 TempPathName, std::move(OS)));
602 std::unique_ptr<llvm::raw_pwrite_stream> CompilerInstance::createOutputFile(
603 StringRef OutputPath, std::error_code &Error, bool Binary,
604 bool RemoveFileOnSignal, StringRef InFile, StringRef Extension,
605 bool UseTemporary, bool CreateMissingDirectories,
606 std::string *ResultPathName, std::string *TempPathName) {
607 assert((!CreateMissingDirectories || UseTemporary) &&
608 "CreateMissingDirectories is only allowed when using temporary files");
610 std::string OutFile, TempFile;
611 if (!OutputPath.empty()) {
612 OutFile = OutputPath;
613 } else if (InFile == "-") {
615 } else if (!Extension.empty()) {
616 SmallString<128> Path(InFile);
617 llvm::sys::path::replace_extension(Path, Extension);
618 OutFile = Path.str();
623 std::unique_ptr<llvm::raw_fd_ostream> OS;
628 UseTemporary = false;
630 llvm::sys::fs::file_status Status;
631 llvm::sys::fs::status(OutputPath, Status);
632 if (llvm::sys::fs::exists(Status)) {
633 // Fail early if we can't write to the final destination.
634 if (!llvm::sys::fs::can_write(OutputPath))
637 // Don't use a temporary if the output is a special file. This handles
638 // things like '-o /dev/null'
639 if (!llvm::sys::fs::is_regular_file(Status))
640 UseTemporary = false;
646 // Create a temporary file.
647 SmallString<128> TempPath;
649 TempPath += "-%%%%%%%%";
652 llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath);
654 if (CreateMissingDirectories &&
655 EC == llvm::errc::no_such_file_or_directory) {
656 StringRef Parent = llvm::sys::path::parent_path(OutputPath);
657 EC = llvm::sys::fs::create_directories(Parent);
659 EC = llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath);
664 OS.reset(new llvm::raw_fd_ostream(fd, /*shouldClose=*/true));
665 OSFile = TempFile = TempPath.str();
667 // If we failed to create the temporary, fallback to writing to the file
668 // directly. This handles the corner case where we cannot write to the
669 // directory, but can write to the file.
674 OS.reset(new llvm::raw_fd_ostream(
676 (Binary ? llvm::sys::fs::F_None : llvm::sys::fs::F_Text)));
681 // Make sure the out stream file gets removed if we crash.
682 if (RemoveFileOnSignal)
683 llvm::sys::RemoveFileOnSignal(OSFile);
686 *ResultPathName = OutFile;
688 *TempPathName = TempFile;
690 if (!Binary || OS->supportsSeeking())
691 return std::move(OS);
693 auto B = llvm::make_unique<llvm::buffer_ostream>(*OS);
694 assert(!NonSeekStream);
695 NonSeekStream = std::move(OS);
699 // Initialization Utilities
701 bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input){
702 return InitializeSourceManager(Input, getDiagnostics(),
703 getFileManager(), getSourceManager(),
707 bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input,
708 DiagnosticsEngine &Diags,
709 FileManager &FileMgr,
710 SourceManager &SourceMgr,
711 const FrontendOptions &Opts) {
712 SrcMgr::CharacteristicKind
713 Kind = Input.isSystem() ? SrcMgr::C_System : SrcMgr::C_User;
715 if (Input.isBuffer()) {
716 SourceMgr.setMainFileID(SourceMgr.createFileID(
717 std::unique_ptr<llvm::MemoryBuffer>(Input.getBuffer()), Kind));
718 assert(!SourceMgr.getMainFileID().isInvalid() &&
719 "Couldn't establish MainFileID!");
723 StringRef InputFile = Input.getFile();
725 // Figure out where to get and map in the main file.
726 if (InputFile != "-") {
727 const FileEntry *File = FileMgr.getFile(InputFile, /*OpenFile=*/true);
729 Diags.Report(diag::err_fe_error_reading) << InputFile;
733 // The natural SourceManager infrastructure can't currently handle named
734 // pipes, but we would at least like to accept them for the main
735 // file. Detect them here, read them with the volatile flag so FileMgr will
736 // pick up the correct size, and simply override their contents as we do for
738 if (File->isNamedPipe()) {
739 auto MB = FileMgr.getBufferForFile(File, /*isVolatile=*/true);
741 // Create a new virtual file that will have the correct size.
742 File = FileMgr.getVirtualFile(InputFile, (*MB)->getBufferSize(), 0);
743 SourceMgr.overrideFileContents(File, std::move(*MB));
745 Diags.Report(diag::err_cannot_open_file) << InputFile
746 << MB.getError().message();
751 SourceMgr.setMainFileID(
752 SourceMgr.createFileID(File, SourceLocation(), Kind));
754 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> SBOrErr =
755 llvm::MemoryBuffer::getSTDIN();
756 if (std::error_code EC = SBOrErr.getError()) {
757 Diags.Report(diag::err_fe_error_reading_stdin) << EC.message();
760 std::unique_ptr<llvm::MemoryBuffer> SB = std::move(SBOrErr.get());
762 const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
763 SB->getBufferSize(), 0);
764 SourceMgr.setMainFileID(
765 SourceMgr.createFileID(File, SourceLocation(), Kind));
766 SourceMgr.overrideFileContents(File, std::move(SB));
769 assert(!SourceMgr.getMainFileID().isInvalid() &&
770 "Couldn't establish MainFileID!");
774 // High-Level Operations
776 bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
777 assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
778 assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
779 assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
781 // FIXME: Take this as an argument, once all the APIs we used have moved to
782 // taking it as an input instead of hard-coding llvm::errs.
783 raw_ostream &OS = llvm::errs();
785 // Create the target instance.
786 setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(),
787 getInvocation().TargetOpts));
791 // Inform the target of the language options.
793 // FIXME: We shouldn't need to do this, the target should be immutable once
794 // created. This complexity should be lifted elsewhere.
795 getTarget().adjust(getLangOpts());
797 // rewriter project will change target built-in bool type from its default.
798 if (getFrontendOpts().ProgramAction == frontend::RewriteObjC)
799 getTarget().noSignedCharForObjCBool();
801 // Validate/process some options.
802 if (getHeaderSearchOpts().Verbose)
803 OS << "clang -cc1 version " CLANG_VERSION_STRING
804 << " based upon " << BACKEND_PACKAGE_STRING
805 << " default target " << llvm::sys::getDefaultTargetTriple() << "\n";
807 if (getFrontendOpts().ShowTimers)
808 createFrontendTimer();
810 if (getFrontendOpts().ShowStats)
811 llvm::EnableStatistics();
813 for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) {
814 // Reset the ID tables if we are reusing the SourceManager and parsing
816 if (hasSourceManager() && !Act.isModelParsingAction())
817 getSourceManager().clearIDTables();
819 if (Act.BeginSourceFile(*this, getFrontendOpts().Inputs[i])) {
825 // Notify the diagnostic client that all files were processed.
826 getDiagnostics().getClient()->finish();
828 if (getDiagnosticOpts().ShowCarets) {
829 // We can have multiple diagnostics sharing one diagnostic client.
830 // Get the total number of warnings/errors from the client.
831 unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
832 unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
835 OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
836 if (NumWarnings && NumErrors)
839 OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
840 if (NumWarnings || NumErrors)
841 OS << " generated.\n";
844 if (getFrontendOpts().ShowStats && hasFileManager()) {
845 getFileManager().PrintStats();
849 return !getDiagnostics().getClient()->getNumErrors();
852 /// \brief Determine the appropriate source input kind based on language
854 static InputKind getSourceInputKindFromOptions(const LangOptions &LangOpts) {
860 return LangOpts.CPlusPlus? IK_ObjCXX : IK_ObjC;
861 return LangOpts.CPlusPlus? IK_CXX : IK_C;
864 /// \brief Compile a module file for the given module, using the options
865 /// provided by the importing compiler instance. Returns true if the module
866 /// was built without errors.
867 static bool compileModuleImpl(CompilerInstance &ImportingInstance,
868 SourceLocation ImportLoc,
870 StringRef ModuleFileName) {
872 = ImportingInstance.getPreprocessor().getHeaderSearchInfo().getModuleMap();
874 // Construct a compiler invocation for creating this module.
875 IntrusiveRefCntPtr<CompilerInvocation> Invocation
876 (new CompilerInvocation(ImportingInstance.getInvocation()));
878 PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
880 // For any options that aren't intended to affect how a module is built,
881 // reset them to their default values.
882 Invocation->getLangOpts()->resetNonModularOptions();
883 PPOpts.resetNonModularOptions();
885 // Remove any macro definitions that are explicitly ignored by the module.
886 // They aren't supposed to affect how the module is built anyway.
887 const HeaderSearchOptions &HSOpts = Invocation->getHeaderSearchOpts();
889 std::remove_if(PPOpts.Macros.begin(), PPOpts.Macros.end(),
890 [&HSOpts](const std::pair<std::string, bool> &def) {
891 StringRef MacroDef = def.first;
892 return HSOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first) > 0;
894 PPOpts.Macros.end());
896 // Note the name of the module we're building.
897 Invocation->getLangOpts()->CurrentModule = Module->getTopLevelModuleName();
899 // Make sure that the failed-module structure has been allocated in
900 // the importing instance, and propagate the pointer to the newly-created
902 PreprocessorOptions &ImportingPPOpts
903 = ImportingInstance.getInvocation().getPreprocessorOpts();
904 if (!ImportingPPOpts.FailedModules)
905 ImportingPPOpts.FailedModules = new PreprocessorOptions::FailedModulesSet;
906 PPOpts.FailedModules = ImportingPPOpts.FailedModules;
908 // If there is a module map file, build the module using the module map.
909 // Set up the inputs/outputs so that we build the module from its umbrella
911 FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
912 FrontendOpts.OutputFile = ModuleFileName.str();
913 FrontendOpts.DisableFree = false;
914 FrontendOpts.GenerateGlobalModuleIndex = false;
915 FrontendOpts.Inputs.clear();
916 InputKind IK = getSourceInputKindFromOptions(*Invocation->getLangOpts());
918 // Don't free the remapped file buffers; they are owned by our caller.
919 PPOpts.RetainRemappedFileBuffers = true;
921 Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
922 assert(ImportingInstance.getInvocation().getModuleHash() ==
923 Invocation->getModuleHash() && "Module hash mismatch!");
925 // Construct a compiler instance that will be used to actually create the
927 CompilerInstance Instance(ImportingInstance.getPCHContainerOperations(),
928 /*BuildingModule=*/true);
929 Instance.setInvocation(&*Invocation);
931 Instance.createDiagnostics(new ForwardingDiagnosticConsumer(
932 ImportingInstance.getDiagnosticClient()),
933 /*ShouldOwnClient=*/true);
935 Instance.setVirtualFileSystem(&ImportingInstance.getVirtualFileSystem());
937 // Note that this module is part of the module build stack, so that we
938 // can detect cycles in the module graph.
939 Instance.setFileManager(&ImportingInstance.getFileManager());
940 Instance.createSourceManager(Instance.getFileManager());
941 SourceManager &SourceMgr = Instance.getSourceManager();
942 SourceMgr.setModuleBuildStack(
943 ImportingInstance.getSourceManager().getModuleBuildStack());
944 SourceMgr.pushModuleBuildStack(Module->getTopLevelModuleName(),
945 FullSourceLoc(ImportLoc, ImportingInstance.getSourceManager()));
947 // If we're collecting module dependencies, we need to share a collector
948 // between all of the module CompilerInstances.
949 Instance.setModuleDepCollector(ImportingInstance.getModuleDepCollector());
951 // Get or create the module map that we'll use to build this module.
952 std::string InferredModuleMapContent;
953 if (const FileEntry *ModuleMapFile =
954 ModMap.getContainingModuleMapFile(Module)) {
955 // Use the module map where this module resides.
956 FrontendOpts.Inputs.emplace_back(ModuleMapFile->getName(), IK);
958 SmallString<128> FakeModuleMapFile(Module->Directory->getName());
959 llvm::sys::path::append(FakeModuleMapFile, "__inferred_module.map");
960 FrontendOpts.Inputs.emplace_back(FakeModuleMapFile, IK);
962 llvm::raw_string_ostream OS(InferredModuleMapContent);
966 std::unique_ptr<llvm::MemoryBuffer> ModuleMapBuffer =
967 llvm::MemoryBuffer::getMemBuffer(InferredModuleMapContent);
968 ModuleMapFile = Instance.getFileManager().getVirtualFile(
969 FakeModuleMapFile, InferredModuleMapContent.size(), 0);
970 SourceMgr.overrideFileContents(ModuleMapFile, std::move(ModuleMapBuffer));
973 // Construct a module-generating action. Passing through the module map is
974 // safe because the FileManager is shared between the compiler instances.
975 GenerateModuleAction CreateModuleAction(
976 ModMap.getModuleMapFileForUniquing(Module), Module->IsSystem);
978 ImportingInstance.getDiagnostics().Report(ImportLoc,
979 diag::remark_module_build)
980 << Module->Name << ModuleFileName;
982 // Execute the action to actually build the module in-place. Use a separate
983 // thread so that we get a stack large enough.
984 const unsigned ThreadStackSize = 8 << 20;
985 llvm::CrashRecoveryContext CRC;
986 CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(CreateModuleAction); },
989 ImportingInstance.getDiagnostics().Report(ImportLoc,
990 diag::remark_module_build_done)
993 // Delete the temporary module map file.
994 // FIXME: Even though we're executing under crash protection, it would still
995 // be nice to do this with RemoveFileOnSignal when we can. However, that
996 // doesn't make sense for all clients, so clean this up manually.
997 Instance.clearOutputFiles(/*EraseFiles=*/true);
999 // We've rebuilt a module. If we're allowed to generate or update the global
1000 // module index, record that fact in the importing compiler instance.
1001 if (ImportingInstance.getFrontendOpts().GenerateGlobalModuleIndex) {
1002 ImportingInstance.setBuildGlobalModuleIndex(true);
1005 return !Instance.getDiagnostics().hasErrorOccurred();
1008 static bool compileAndLoadModule(CompilerInstance &ImportingInstance,
1009 SourceLocation ImportLoc,
1010 SourceLocation ModuleNameLoc, Module *Module,
1011 StringRef ModuleFileName) {
1012 DiagnosticsEngine &Diags = ImportingInstance.getDiagnostics();
1014 auto diagnoseBuildFailure = [&] {
1015 Diags.Report(ModuleNameLoc, diag::err_module_not_built)
1016 << Module->Name << SourceRange(ImportLoc, ModuleNameLoc);
1019 // FIXME: have LockFileManager return an error_code so that we can
1020 // avoid the mkdir when the directory already exists.
1021 StringRef Dir = llvm::sys::path::parent_path(ModuleFileName);
1022 llvm::sys::fs::create_directories(Dir);
1025 unsigned ModuleLoadCapabilities = ASTReader::ARR_Missing;
1026 llvm::LockFileManager Locked(ModuleFileName);
1028 case llvm::LockFileManager::LFS_Error:
1029 Diags.Report(ModuleNameLoc, diag::err_module_lock_failure)
1033 case llvm::LockFileManager::LFS_Owned:
1034 // We're responsible for building the module ourselves.
1035 if (!compileModuleImpl(ImportingInstance, ModuleNameLoc, Module,
1037 diagnoseBuildFailure();
1042 case llvm::LockFileManager::LFS_Shared:
1043 // Someone else is responsible for building the module. Wait for them to
1045 switch (Locked.waitForUnlock()) {
1046 case llvm::LockFileManager::Res_Success:
1047 ModuleLoadCapabilities |= ASTReader::ARR_OutOfDate;
1049 case llvm::LockFileManager::Res_OwnerDied:
1050 continue; // try again to get the lock.
1051 case llvm::LockFileManager::Res_Timeout:
1052 Diags.Report(ModuleNameLoc, diag::err_module_lock_timeout)
1054 // Clear the lock file so that future invokations can make progress.
1055 Locked.unsafeRemoveLockFile();
1061 // Try to read the module file, now that we've compiled it.
1062 ASTReader::ASTReadResult ReadResult =
1063 ImportingInstance.getModuleManager()->ReadAST(
1064 ModuleFileName, serialization::MK_ImplicitModule, ImportLoc,
1065 ModuleLoadCapabilities);
1067 if (ReadResult == ASTReader::OutOfDate &&
1068 Locked == llvm::LockFileManager::LFS_Shared) {
1069 // The module may be out of date in the presence of file system races,
1070 // or if one of its imports depends on header search paths that are not
1071 // consistent with this ImportingInstance. Try again...
1073 } else if (ReadResult == ASTReader::Missing) {
1074 diagnoseBuildFailure();
1075 } else if (ReadResult != ASTReader::Success &&
1076 !Diags.hasErrorOccurred()) {
1077 // The ASTReader didn't diagnose the error, so conservatively report it.
1078 diagnoseBuildFailure();
1080 return ReadResult == ASTReader::Success;
1084 /// \brief Diagnose differences between the current definition of the given
1085 /// configuration macro and the definition provided on the command line.
1086 static void checkConfigMacro(Preprocessor &PP, StringRef ConfigMacro,
1087 Module *Mod, SourceLocation ImportLoc) {
1088 IdentifierInfo *Id = PP.getIdentifierInfo(ConfigMacro);
1089 SourceManager &SourceMgr = PP.getSourceManager();
1091 // If this identifier has never had a macro definition, then it could
1092 // not have changed.
1093 if (!Id->hadMacroDefinition())
1095 auto *LatestLocalMD = PP.getLocalMacroDirectiveHistory(Id);
1097 // Find the macro definition from the command line.
1098 MacroInfo *CmdLineDefinition = nullptr;
1099 for (auto *MD = LatestLocalMD; MD; MD = MD->getPrevious()) {
1100 // We only care about the predefines buffer.
1101 FileID FID = SourceMgr.getFileID(MD->getLocation());
1102 if (FID.isInvalid() || FID != PP.getPredefinesFileID())
1104 if (auto *DMD = dyn_cast<DefMacroDirective>(MD))
1105 CmdLineDefinition = DMD->getMacroInfo();
1109 auto *CurrentDefinition = PP.getMacroInfo(Id);
1110 if (CurrentDefinition == CmdLineDefinition) {
1111 // Macro matches. Nothing to do.
1112 } else if (!CurrentDefinition) {
1113 // This macro was defined on the command line, then #undef'd later.
1115 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1116 << true << ConfigMacro << Mod->getFullModuleName();
1117 auto LatestDef = LatestLocalMD->getDefinition();
1118 assert(LatestDef.isUndefined() &&
1119 "predefined macro went away with no #undef?");
1120 PP.Diag(LatestDef.getUndefLocation(), diag::note_module_def_undef_here)
1123 } else if (!CmdLineDefinition) {
1124 // There was no definition for this macro in the predefines buffer,
1125 // but there was a local definition. Complain.
1126 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1127 << false << ConfigMacro << Mod->getFullModuleName();
1128 PP.Diag(CurrentDefinition->getDefinitionLoc(),
1129 diag::note_module_def_undef_here)
1131 } else if (!CurrentDefinition->isIdenticalTo(*CmdLineDefinition, PP,
1132 /*Syntactically=*/true)) {
1133 // The macro definitions differ.
1134 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1135 << false << ConfigMacro << Mod->getFullModuleName();
1136 PP.Diag(CurrentDefinition->getDefinitionLoc(),
1137 diag::note_module_def_undef_here)
1142 /// \brief Write a new timestamp file with the given path.
1143 static void writeTimestampFile(StringRef TimestampFile) {
1145 llvm::raw_fd_ostream Out(TimestampFile.str(), EC, llvm::sys::fs::F_None);
1148 /// \brief Prune the module cache of modules that haven't been accessed in
1150 static void pruneModuleCache(const HeaderSearchOptions &HSOpts) {
1151 struct stat StatBuf;
1152 llvm::SmallString<128> TimestampFile;
1153 TimestampFile = HSOpts.ModuleCachePath;
1154 llvm::sys::path::append(TimestampFile, "modules.timestamp");
1156 // Try to stat() the timestamp file.
1157 if (::stat(TimestampFile.c_str(), &StatBuf)) {
1158 // If the timestamp file wasn't there, create one now.
1159 if (errno == ENOENT) {
1160 writeTimestampFile(TimestampFile);
1165 // Check whether the time stamp is older than our pruning interval.
1166 // If not, do nothing.
1167 time_t TimeStampModTime = StatBuf.st_mtime;
1168 time_t CurrentTime = time(nullptr);
1169 if (CurrentTime - TimeStampModTime <= time_t(HSOpts.ModuleCachePruneInterval))
1172 // Write a new timestamp file so that nobody else attempts to prune.
1173 // There is a benign race condition here, if two Clang instances happen to
1174 // notice at the same time that the timestamp is out-of-date.
1175 writeTimestampFile(TimestampFile);
1177 // Walk the entire module cache, looking for unused module files and module
1180 SmallString<128> ModuleCachePathNative;
1181 llvm::sys::path::native(HSOpts.ModuleCachePath, ModuleCachePathNative);
1182 for (llvm::sys::fs::directory_iterator Dir(ModuleCachePathNative, EC), DirEnd;
1183 Dir != DirEnd && !EC; Dir.increment(EC)) {
1184 // If we don't have a directory, there's nothing to look into.
1185 if (!llvm::sys::fs::is_directory(Dir->path()))
1188 // Walk all of the files within this directory.
1189 for (llvm::sys::fs::directory_iterator File(Dir->path(), EC), FileEnd;
1190 File != FileEnd && !EC; File.increment(EC)) {
1191 // We only care about module and global module index files.
1192 StringRef Extension = llvm::sys::path::extension(File->path());
1193 if (Extension != ".pcm" && Extension != ".timestamp" &&
1194 llvm::sys::path::filename(File->path()) != "modules.idx")
1197 // Look at this file. If we can't stat it, there's nothing interesting
1199 if (::stat(File->path().c_str(), &StatBuf))
1202 // If the file has been used recently enough, leave it there.
1203 time_t FileAccessTime = StatBuf.st_atime;
1204 if (CurrentTime - FileAccessTime <=
1205 time_t(HSOpts.ModuleCachePruneAfter)) {
1210 llvm::sys::fs::remove(File->path());
1212 // Remove the timestamp file.
1213 std::string TimpestampFilename = File->path() + ".timestamp";
1214 llvm::sys::fs::remove(TimpestampFilename);
1217 // If we removed all of the files in the directory, remove the directory
1219 if (llvm::sys::fs::directory_iterator(Dir->path(), EC) ==
1220 llvm::sys::fs::directory_iterator() && !EC)
1221 llvm::sys::fs::remove(Dir->path());
1225 void CompilerInstance::createModuleManager() {
1226 if (!ModuleManager) {
1227 if (!hasASTContext())
1230 // If we're implicitly building modules but not currently recursively
1231 // building a module, check whether we need to prune the module cache.
1232 if (getLangOpts().ImplicitModules &&
1233 getSourceManager().getModuleBuildStack().empty() &&
1234 getHeaderSearchOpts().ModuleCachePruneInterval > 0 &&
1235 getHeaderSearchOpts().ModuleCachePruneAfter > 0) {
1236 pruneModuleCache(getHeaderSearchOpts());
1239 HeaderSearchOptions &HSOpts = getHeaderSearchOpts();
1240 std::string Sysroot = HSOpts.Sysroot;
1241 const PreprocessorOptions &PPOpts = getPreprocessorOpts();
1242 std::unique_ptr<llvm::Timer> ReadTimer;
1243 if (FrontendTimerGroup)
1244 ReadTimer = llvm::make_unique<llvm::Timer>("Reading modules",
1245 *FrontendTimerGroup);
1246 ModuleManager = new ASTReader(
1247 getPreprocessor(), *Context, getPCHContainerReader(),
1248 Sysroot.empty() ? "" : Sysroot.c_str(), PPOpts.DisablePCHValidation,
1249 /*AllowASTWithCompilerErrors=*/false,
1250 /*AllowConfigurationMismatch=*/false,
1251 HSOpts.ModulesValidateSystemHeaders,
1252 getFrontendOpts().UseGlobalModuleIndex,
1253 std::move(ReadTimer));
1254 if (hasASTConsumer()) {
1255 ModuleManager->setDeserializationListener(
1256 getASTConsumer().GetASTDeserializationListener());
1257 getASTContext().setASTMutationListener(
1258 getASTConsumer().GetASTMutationListener());
1260 getASTContext().setExternalSource(ModuleManager);
1262 ModuleManager->InitializeSema(getSema());
1263 if (hasASTConsumer())
1264 ModuleManager->StartTranslationUnit(&getASTConsumer());
1268 bool CompilerInstance::loadModuleFile(StringRef FileName) {
1270 if (FrontendTimerGroup)
1271 Timer.init("Preloading " + FileName.str(), *FrontendTimerGroup);
1272 llvm::TimeRegion TimeLoading(FrontendTimerGroup ? &Timer : nullptr);
1274 // Helper to recursively read the module names for all modules we're adding.
1275 // We mark these as known and redirect any attempt to load that module to
1276 // the files we were handed.
1277 struct ReadModuleNames : ASTReaderListener {
1278 CompilerInstance &CI;
1279 std::vector<StringRef> ModuleFileStack;
1280 std::vector<StringRef> ModuleNameStack;
1282 bool TopFileIsModule;
1284 ReadModuleNames(CompilerInstance &CI)
1285 : CI(CI), Failed(false), TopFileIsModule(false) {}
1287 bool needsImportVisitation() const override { return true; }
1289 void visitImport(StringRef FileName) override {
1290 if (!CI.ExplicitlyLoadedModuleFiles.insert(FileName).second) {
1291 if (ModuleFileStack.size() == 0)
1292 TopFileIsModule = true;
1296 ModuleFileStack.push_back(FileName);
1297 ModuleNameStack.push_back(StringRef());
1298 if (ASTReader::readASTFileControlBlock(FileName, CI.getFileManager(),
1299 CI.getPCHContainerReader(),
1301 CI.getDiagnostics().Report(
1302 SourceLocation(), CI.getFileManager().getBufferForFile(FileName)
1303 ? diag::err_module_file_invalid
1304 : diag::err_module_file_not_found)
1306 for (int I = ModuleFileStack.size() - 2; I >= 0; --I)
1307 CI.getDiagnostics().Report(SourceLocation(),
1308 diag::note_module_file_imported_by)
1309 << ModuleFileStack[I]
1310 << !ModuleNameStack[I].empty() << ModuleNameStack[I];
1313 ModuleNameStack.pop_back();
1314 ModuleFileStack.pop_back();
1317 void ReadModuleName(StringRef ModuleName) override {
1318 if (ModuleFileStack.size() == 1)
1319 TopFileIsModule = true;
1320 ModuleNameStack.back() = ModuleName;
1322 auto &ModuleFile = CI.ModuleFileOverrides[ModuleName];
1323 if (!ModuleFile.empty() &&
1324 CI.getFileManager().getFile(ModuleFile) !=
1325 CI.getFileManager().getFile(ModuleFileStack.back()))
1326 CI.getDiagnostics().Report(SourceLocation(),
1327 diag::err_conflicting_module_files)
1328 << ModuleName << ModuleFile << ModuleFileStack.back();
1329 ModuleFile = ModuleFileStack.back();
1333 // If we don't already have an ASTReader, create one now.
1335 createModuleManager();
1337 // Tell the module manager about this module file.
1338 if (getModuleManager()->getModuleManager().addKnownModuleFile(FileName)) {
1339 getDiagnostics().Report(SourceLocation(), diag::err_module_file_not_found)
1344 // Build our mapping of module names to module files from this file
1346 RMN.visitImport(FileName);
1351 // If we never found a module name for the top file, then it's not a module,
1352 // it's a PCH or preamble or something.
1353 if (!RMN.TopFileIsModule) {
1354 getDiagnostics().Report(SourceLocation(), diag::err_module_file_not_module)
1363 CompilerInstance::loadModule(SourceLocation ImportLoc,
1365 Module::NameVisibilityKind Visibility,
1366 bool IsInclusionDirective) {
1367 // Determine what file we're searching from.
1368 StringRef ModuleName = Path[0].first->getName();
1369 SourceLocation ModuleNameLoc = Path[0].second;
1371 // If we've already handled this import, just return the cached result.
1372 // This one-element cache is important to eliminate redundant diagnostics
1373 // when both the preprocessor and parser see the same import declaration.
1374 if (!ImportLoc.isInvalid() && LastModuleImportLoc == ImportLoc) {
1375 // Make the named module visible.
1376 if (LastModuleImportResult && ModuleName != getLangOpts().CurrentModule &&
1377 ModuleName != getLangOpts().ImplementationOfModule)
1378 ModuleManager->makeModuleVisible(LastModuleImportResult, Visibility,
1380 return LastModuleImportResult;
1383 clang::Module *Module = nullptr;
1385 // If we don't already have information on this module, load the module now.
1386 llvm::DenseMap<const IdentifierInfo *, clang::Module *>::iterator Known
1387 = KnownModules.find(Path[0].first);
1388 if (Known != KnownModules.end()) {
1389 // Retrieve the cached top-level module.
1390 Module = Known->second;
1391 } else if (ModuleName == getLangOpts().CurrentModule ||
1392 ModuleName == getLangOpts().ImplementationOfModule) {
1393 // This is the module we're building.
1394 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1395 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first;
1397 // Search for a module with the given name.
1398 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1400 getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_found)
1402 << SourceRange(ImportLoc, ModuleNameLoc);
1403 ModuleBuildFailed = true;
1404 return ModuleLoadResult();
1407 auto Override = ModuleFileOverrides.find(ModuleName);
1408 bool Explicit = Override != ModuleFileOverrides.end();
1409 if (!Explicit && !getLangOpts().ImplicitModules) {
1410 getDiagnostics().Report(ModuleNameLoc, diag::err_module_build_disabled)
1412 ModuleBuildFailed = true;
1413 return ModuleLoadResult();
1416 std::string ModuleFileName =
1417 Explicit ? Override->second
1418 : PP->getHeaderSearchInfo().getModuleFileName(Module);
1420 // If we don't already have an ASTReader, create one now.
1422 createModuleManager();
1424 if (TheDependencyFileGenerator)
1425 TheDependencyFileGenerator->AttachToASTReader(*ModuleManager);
1427 if (ModuleDepCollector)
1428 ModuleDepCollector->attachToASTReader(*ModuleManager);
1430 for (auto &Listener : DependencyCollectors)
1431 Listener->attachToASTReader(*ModuleManager);
1434 if (FrontendTimerGroup)
1435 Timer.init("Loading " + ModuleFileName, *FrontendTimerGroup);
1436 llvm::TimeRegion TimeLoading(FrontendTimerGroup ? &Timer : nullptr);
1438 // Try to load the module file.
1440 Explicit ? 0 : ASTReader::ARR_OutOfDate | ASTReader::ARR_Missing;
1441 switch (ModuleManager->ReadAST(ModuleFileName,
1442 Explicit ? serialization::MK_ExplicitModule
1443 : serialization::MK_ImplicitModule,
1444 ImportLoc, ARRFlags)) {
1445 case ASTReader::Success:
1448 case ASTReader::OutOfDate:
1449 case ASTReader::Missing: {
1451 // ReadAST has already complained for us.
1452 ModuleLoader::HadFatalFailure = true;
1453 KnownModules[Path[0].first] = nullptr;
1454 return ModuleLoadResult();
1457 // The module file is missing or out-of-date. Build it.
1458 assert(Module && "missing module file");
1459 // Check whether there is a cycle in the module graph.
1460 ModuleBuildStack ModPath = getSourceManager().getModuleBuildStack();
1461 ModuleBuildStack::iterator Pos = ModPath.begin(), PosEnd = ModPath.end();
1462 for (; Pos != PosEnd; ++Pos) {
1463 if (Pos->first == ModuleName)
1467 if (Pos != PosEnd) {
1468 SmallString<256> CyclePath;
1469 for (; Pos != PosEnd; ++Pos) {
1470 CyclePath += Pos->first;
1471 CyclePath += " -> ";
1473 CyclePath += ModuleName;
1475 getDiagnostics().Report(ModuleNameLoc, diag::err_module_cycle)
1476 << ModuleName << CyclePath;
1477 return ModuleLoadResult();
1480 // Check whether we have already attempted to build this module (but
1482 if (getPreprocessorOpts().FailedModules &&
1483 getPreprocessorOpts().FailedModules->hasAlreadyFailed(ModuleName)) {
1484 getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_built)
1486 << SourceRange(ImportLoc, ModuleNameLoc);
1487 ModuleBuildFailed = true;
1488 return ModuleLoadResult();
1491 // Try to compile and then load the module.
1492 if (!compileAndLoadModule(*this, ImportLoc, ModuleNameLoc, Module,
1494 assert(getDiagnostics().hasErrorOccurred() &&
1495 "undiagnosed error in compileAndLoadModule");
1496 if (getPreprocessorOpts().FailedModules)
1497 getPreprocessorOpts().FailedModules->addFailed(ModuleName);
1498 KnownModules[Path[0].first] = nullptr;
1499 ModuleBuildFailed = true;
1500 return ModuleLoadResult();
1503 // Okay, we've rebuilt and now loaded the module.
1507 case ASTReader::VersionMismatch:
1508 case ASTReader::ConfigurationMismatch:
1509 case ASTReader::HadErrors:
1510 ModuleLoader::HadFatalFailure = true;
1511 // FIXME: The ASTReader will already have complained, but can we showhorn
1512 // that diagnostic information into a more useful form?
1513 KnownModules[Path[0].first] = nullptr;
1514 return ModuleLoadResult();
1516 case ASTReader::Failure:
1517 ModuleLoader::HadFatalFailure = true;
1518 // Already complained, but note now that we failed.
1519 KnownModules[Path[0].first] = nullptr;
1520 ModuleBuildFailed = true;
1521 return ModuleLoadResult();
1524 // Cache the result of this top-level module lookup for later.
1525 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first;
1528 // If we never found the module, fail.
1530 return ModuleLoadResult();
1532 // Verify that the rest of the module path actually corresponds to
1534 if (Path.size() > 1) {
1535 for (unsigned I = 1, N = Path.size(); I != N; ++I) {
1536 StringRef Name = Path[I].first->getName();
1537 clang::Module *Sub = Module->findSubmodule(Name);
1540 // Attempt to perform typo correction to find a module name that works.
1541 SmallVector<StringRef, 2> Best;
1542 unsigned BestEditDistance = (std::numeric_limits<unsigned>::max)();
1544 for (clang::Module::submodule_iterator J = Module->submodule_begin(),
1545 JEnd = Module->submodule_end();
1547 unsigned ED = Name.edit_distance((*J)->Name,
1548 /*AllowReplacements=*/true,
1550 if (ED <= BestEditDistance) {
1551 if (ED < BestEditDistance) {
1553 BestEditDistance = ED;
1556 Best.push_back((*J)->Name);
1560 // If there was a clear winner, user it.
1561 if (Best.size() == 1) {
1562 getDiagnostics().Report(Path[I].second,
1563 diag::err_no_submodule_suggest)
1564 << Path[I].first << Module->getFullModuleName() << Best[0]
1565 << SourceRange(Path[0].second, Path[I-1].second)
1566 << FixItHint::CreateReplacement(SourceRange(Path[I].second),
1569 Sub = Module->findSubmodule(Best[0]);
1574 // No submodule by this name. Complain, and don't look for further
1576 getDiagnostics().Report(Path[I].second, diag::err_no_submodule)
1577 << Path[I].first << Module->getFullModuleName()
1578 << SourceRange(Path[0].second, Path[I-1].second);
1586 // Don't make the module visible if we are in the implementation.
1587 if (ModuleName == getLangOpts().ImplementationOfModule)
1588 return ModuleLoadResult(Module, false);
1590 // Make the named module visible, if it's not already part of the module
1592 if (ModuleName != getLangOpts().CurrentModule) {
1593 if (!Module->IsFromModuleFile) {
1594 // We have an umbrella header or directory that doesn't actually include
1595 // all of the headers within the directory it covers. Complain about
1596 // this missing submodule and recover by forgetting that we ever saw
1598 // FIXME: Should we detect this at module load time? It seems fairly
1599 // expensive (and rare).
1600 getDiagnostics().Report(ImportLoc, diag::warn_missing_submodule)
1601 << Module->getFullModuleName()
1602 << SourceRange(Path.front().second, Path.back().second);
1604 return ModuleLoadResult(nullptr, true);
1607 // Check whether this module is available.
1608 clang::Module::Requirement Requirement;
1609 clang::Module::UnresolvedHeaderDirective MissingHeader;
1610 if (!Module->isAvailable(getLangOpts(), getTarget(), Requirement,
1612 if (MissingHeader.FileNameLoc.isValid()) {
1613 getDiagnostics().Report(MissingHeader.FileNameLoc,
1614 diag::err_module_header_missing)
1615 << MissingHeader.IsUmbrella << MissingHeader.FileName;
1617 getDiagnostics().Report(ImportLoc, diag::err_module_unavailable)
1618 << Module->getFullModuleName()
1619 << Requirement.second << Requirement.first
1620 << SourceRange(Path.front().second, Path.back().second);
1622 LastModuleImportLoc = ImportLoc;
1623 LastModuleImportResult = ModuleLoadResult();
1624 return ModuleLoadResult();
1627 ModuleManager->makeModuleVisible(Module, Visibility, ImportLoc);
1630 // Check for any configuration macros that have changed.
1631 clang::Module *TopModule = Module->getTopLevelModule();
1632 for (unsigned I = 0, N = TopModule->ConfigMacros.size(); I != N; ++I) {
1633 checkConfigMacro(getPreprocessor(), TopModule->ConfigMacros[I],
1637 LastModuleImportLoc = ImportLoc;
1638 LastModuleImportResult = ModuleLoadResult(Module, false);
1639 return LastModuleImportResult;
1642 void CompilerInstance::makeModuleVisible(Module *Mod,
1643 Module::NameVisibilityKind Visibility,
1644 SourceLocation ImportLoc) {
1646 createModuleManager();
1650 ModuleManager->makeModuleVisible(Mod, Visibility, ImportLoc);
1653 GlobalModuleIndex *CompilerInstance::loadGlobalModuleIndex(
1654 SourceLocation TriggerLoc) {
1656 createModuleManager();
1657 // Can't do anything if we don't have the module manager.
1660 // Get an existing global index. This loads it if not already
1662 ModuleManager->loadGlobalIndex();
1663 GlobalModuleIndex *GlobalIndex = ModuleManager->getGlobalIndex();
1664 // If the global index doesn't exist, create it.
1665 if (!GlobalIndex && shouldBuildGlobalModuleIndex() && hasFileManager() &&
1666 hasPreprocessor()) {
1667 llvm::sys::fs::create_directories(
1668 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1669 GlobalModuleIndex::writeIndex(
1670 getFileManager(), getPCHContainerReader(),
1671 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1672 ModuleManager->resetForReload();
1673 ModuleManager->loadGlobalIndex();
1674 GlobalIndex = ModuleManager->getGlobalIndex();
1676 // For finding modules needing to be imported for fixit messages,
1677 // we need to make the global index cover all modules, so we do that here.
1678 if (!HaveFullGlobalModuleIndex && GlobalIndex && !buildingModule()) {
1679 ModuleMap &MMap = getPreprocessor().getHeaderSearchInfo().getModuleMap();
1680 bool RecreateIndex = false;
1681 for (ModuleMap::module_iterator I = MMap.module_begin(),
1682 E = MMap.module_end(); I != E; ++I) {
1683 Module *TheModule = I->second;
1684 const FileEntry *Entry = TheModule->getASTFile();
1686 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1687 Path.push_back(std::make_pair(
1688 getPreprocessor().getIdentifierInfo(TheModule->Name), TriggerLoc));
1689 std::reverse(Path.begin(), Path.end());
1690 // Load a module as hidden. This also adds it to the global index.
1691 loadModule(TheModule->DefinitionLoc, Path,
1692 Module::Hidden, false);
1693 RecreateIndex = true;
1696 if (RecreateIndex) {
1697 GlobalModuleIndex::writeIndex(
1698 getFileManager(), getPCHContainerReader(),
1699 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1700 ModuleManager->resetForReload();
1701 ModuleManager->loadGlobalIndex();
1702 GlobalIndex = ModuleManager->getGlobalIndex();
1704 HaveFullGlobalModuleIndex = true;
1709 // Check global module index for missing imports.
1711 CompilerInstance::lookupMissingImports(StringRef Name,
1712 SourceLocation TriggerLoc) {
1713 // Look for the symbol in non-imported modules, but only if an error
1714 // actually occurred.
1715 if (!buildingModule()) {
1716 // Load global module index, or retrieve a previously loaded one.
1717 GlobalModuleIndex *GlobalIndex = loadGlobalModuleIndex(
1720 // Only if we have a global index.
1722 GlobalModuleIndex::HitSet FoundModules;
1724 // Find the modules that reference the identifier.
1725 // Note that this only finds top-level modules.
1726 // We'll let diagnoseTypo find the actual declaration module.
1727 if (GlobalIndex->lookupIdentifier(Name, FoundModules))
1734 void CompilerInstance::resetAndLeakSema() { BuryPointer(takeSema()); }