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/Lex/PreprocessorOptions.h"
33 #include "clang/Sema/CodeCompleteConsumer.h"
34 #include "clang/Sema/Sema.h"
35 #include "clang/Serialization/ASTReader.h"
36 #include "clang/Serialization/GlobalModuleIndex.h"
37 #include "llvm/ADT/Statistic.h"
38 #include "llvm/Support/CrashRecoveryContext.h"
39 #include "llvm/Support/Errc.h"
40 #include "llvm/Support/FileSystem.h"
41 #include "llvm/Support/Host.h"
42 #include "llvm/Support/LockFileManager.h"
43 #include "llvm/Support/MemoryBuffer.h"
44 #include "llvm/Support/Path.h"
45 #include "llvm/Support/Program.h"
46 #include "llvm/Support/Signals.h"
47 #include "llvm/Support/Timer.h"
48 #include "llvm/Support/raw_ostream.h"
50 #include <system_error>
54 using namespace clang;
56 CompilerInstance::CompilerInstance(
57 std::shared_ptr<PCHContainerOperations> PCHContainerOps,
59 : ModuleLoader(BuildingModule), Invocation(new CompilerInvocation()),
60 ModuleManager(nullptr),
61 ThePCHContainerOperations(std::move(PCHContainerOps)),
62 BuildGlobalModuleIndex(false), HaveFullGlobalModuleIndex(false),
63 ModuleBuildFailed(false) {}
65 CompilerInstance::~CompilerInstance() {
66 assert(OutputFiles.empty() && "Still output files in flight?");
69 void CompilerInstance::setInvocation(
70 std::shared_ptr<CompilerInvocation> Value) {
71 Invocation = std::move(Value);
74 bool CompilerInstance::shouldBuildGlobalModuleIndex() const {
75 return (BuildGlobalModuleIndex ||
76 (ModuleManager && ModuleManager->isGlobalIndexUnavailable() &&
77 getFrontendOpts().GenerateGlobalModuleIndex)) &&
81 void CompilerInstance::setDiagnostics(DiagnosticsEngine *Value) {
85 void CompilerInstance::setTarget(TargetInfo *Value) { Target = Value; }
86 void CompilerInstance::setAuxTarget(TargetInfo *Value) { AuxTarget = Value; }
88 void CompilerInstance::setFileManager(FileManager *Value) {
91 VirtualFileSystem = Value->getVirtualFileSystem();
93 VirtualFileSystem.reset();
96 void CompilerInstance::setSourceManager(SourceManager *Value) {
100 void CompilerInstance::setPreprocessor(std::shared_ptr<Preprocessor> Value) {
101 PP = std::move(Value);
104 void CompilerInstance::setASTContext(ASTContext *Value) {
107 if (Context && Consumer)
108 getASTConsumer().Initialize(getASTContext());
111 void CompilerInstance::setSema(Sema *S) {
115 void CompilerInstance::setASTConsumer(std::unique_ptr<ASTConsumer> Value) {
116 Consumer = std::move(Value);
118 if (Context && Consumer)
119 getASTConsumer().Initialize(getASTContext());
122 void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) {
123 CompletionConsumer.reset(Value);
126 std::unique_ptr<Sema> CompilerInstance::takeSema() {
127 return std::move(TheSema);
130 IntrusiveRefCntPtr<ASTReader> CompilerInstance::getModuleManager() const {
131 return ModuleManager;
133 void CompilerInstance::setModuleManager(IntrusiveRefCntPtr<ASTReader> Reader) {
134 ModuleManager = std::move(Reader);
137 std::shared_ptr<ModuleDependencyCollector>
138 CompilerInstance::getModuleDepCollector() const {
139 return ModuleDepCollector;
142 void CompilerInstance::setModuleDepCollector(
143 std::shared_ptr<ModuleDependencyCollector> Collector) {
144 ModuleDepCollector = std::move(Collector);
147 static void collectHeaderMaps(const HeaderSearch &HS,
148 std::shared_ptr<ModuleDependencyCollector> MDC) {
149 SmallVector<std::string, 4> HeaderMapFileNames;
150 HS.getHeaderMapFileNames(HeaderMapFileNames);
151 for (auto &Name : HeaderMapFileNames)
155 static void collectIncludePCH(CompilerInstance &CI,
156 std::shared_ptr<ModuleDependencyCollector> MDC) {
157 const PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
158 if (PPOpts.ImplicitPCHInclude.empty())
161 StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
162 FileManager &FileMgr = CI.getFileManager();
163 const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude);
165 MDC->addFile(PCHInclude);
170 SmallString<128> DirNative;
171 llvm::sys::path::native(PCHDir->getName(), DirNative);
172 vfs::FileSystem &FS = *FileMgr.getVirtualFileSystem();
173 SimpleASTReaderListener Validator(CI.getPreprocessor());
174 for (vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
175 Dir != DirEnd && !EC; Dir.increment(EC)) {
176 // Check whether this is an AST file. ASTReader::isAcceptableASTFile is not
177 // used here since we're not interested in validating the PCH at this time,
178 // but only to check whether this is a file containing an AST.
179 if (!ASTReader::readASTFileControlBlock(
180 Dir->getName(), FileMgr, CI.getPCHContainerReader(),
181 /*FindModuleFileExtensions=*/false, Validator,
182 /*ValidateDiagnosticOptions=*/false))
183 MDC->addFile(Dir->getName());
187 static void collectVFSEntries(CompilerInstance &CI,
188 std::shared_ptr<ModuleDependencyCollector> MDC) {
189 if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
192 // Collect all VFS found.
193 SmallVector<vfs::YAMLVFSEntry, 16> VFSEntries;
194 for (const std::string &VFSFile : CI.getHeaderSearchOpts().VFSOverlayFiles) {
195 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
196 llvm::MemoryBuffer::getFile(VFSFile);
199 vfs::collectVFSFromYAML(std::move(Buffer.get()), /*DiagHandler*/ nullptr,
200 VFSFile, VFSEntries);
203 for (auto &E : VFSEntries)
204 MDC->addFile(E.VPath, E.RPath);
208 static void SetUpDiagnosticLog(DiagnosticOptions *DiagOpts,
209 const CodeGenOptions *CodeGenOpts,
210 DiagnosticsEngine &Diags) {
212 std::unique_ptr<raw_ostream> StreamOwner;
213 raw_ostream *OS = &llvm::errs();
214 if (DiagOpts->DiagnosticLogFile != "-") {
215 // Create the output stream.
216 auto FileOS = llvm::make_unique<llvm::raw_fd_ostream>(
217 DiagOpts->DiagnosticLogFile, EC,
218 llvm::sys::fs::F_Append | llvm::sys::fs::F_Text);
220 Diags.Report(diag::warn_fe_cc_log_diagnostics_failure)
221 << DiagOpts->DiagnosticLogFile << EC.message();
223 FileOS->SetUnbuffered();
225 StreamOwner = std::move(FileOS);
229 // Chain in the diagnostic client which will log the diagnostics.
230 auto Logger = llvm::make_unique<LogDiagnosticPrinter>(*OS, DiagOpts,
231 std::move(StreamOwner));
233 Logger->setDwarfDebugFlags(CodeGenOpts->DwarfDebugFlags);
234 assert(Diags.ownsClient());
236 new ChainedDiagnosticConsumer(Diags.takeClient(), std::move(Logger)));
239 static void SetupSerializedDiagnostics(DiagnosticOptions *DiagOpts,
240 DiagnosticsEngine &Diags,
241 StringRef OutputFile) {
242 auto SerializedConsumer =
243 clang::serialized_diags::create(OutputFile, DiagOpts);
245 if (Diags.ownsClient()) {
246 Diags.setClient(new ChainedDiagnosticConsumer(
247 Diags.takeClient(), std::move(SerializedConsumer)));
249 Diags.setClient(new ChainedDiagnosticConsumer(
250 Diags.getClient(), std::move(SerializedConsumer)));
254 void CompilerInstance::createDiagnostics(DiagnosticConsumer *Client,
255 bool ShouldOwnClient) {
256 Diagnostics = createDiagnostics(&getDiagnosticOpts(), Client,
257 ShouldOwnClient, &getCodeGenOpts());
260 IntrusiveRefCntPtr<DiagnosticsEngine>
261 CompilerInstance::createDiagnostics(DiagnosticOptions *Opts,
262 DiagnosticConsumer *Client,
263 bool ShouldOwnClient,
264 const CodeGenOptions *CodeGenOpts) {
265 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
266 IntrusiveRefCntPtr<DiagnosticsEngine>
267 Diags(new DiagnosticsEngine(DiagID, Opts));
269 // Create the diagnostic client for reporting errors or for
270 // implementing -verify.
272 Diags->setClient(Client, ShouldOwnClient);
274 Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts));
276 // Chain in -verify checker, if requested.
277 if (Opts->VerifyDiagnostics)
278 Diags->setClient(new VerifyDiagnosticConsumer(*Diags));
280 // Chain in -diagnostic-log-file dumper, if requested.
281 if (!Opts->DiagnosticLogFile.empty())
282 SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags);
284 if (!Opts->DiagnosticSerializationFile.empty())
285 SetupSerializedDiagnostics(Opts, *Diags,
286 Opts->DiagnosticSerializationFile);
288 // Configure our handling of diagnostics.
289 ProcessWarningOptions(*Diags, *Opts);
296 void CompilerInstance::createFileManager() {
297 if (!hasVirtualFileSystem()) {
298 // TODO: choose the virtual file system based on the CompilerInvocation.
299 setVirtualFileSystem(vfs::getRealFileSystem());
301 FileMgr = new FileManager(getFileSystemOpts(), VirtualFileSystem);
306 void CompilerInstance::createSourceManager(FileManager &FileMgr) {
307 SourceMgr = new SourceManager(getDiagnostics(), FileMgr);
310 // Initialize the remapping of files to alternative contents, e.g.,
311 // those specified through other files.
312 static void InitializeFileRemapping(DiagnosticsEngine &Diags,
313 SourceManager &SourceMgr,
314 FileManager &FileMgr,
315 const PreprocessorOptions &InitOpts) {
316 // Remap files in the source manager (with buffers).
317 for (const auto &RB : InitOpts.RemappedFileBuffers) {
318 // Create the file entry for the file that we're mapping from.
319 const FileEntry *FromFile =
320 FileMgr.getVirtualFile(RB.first, RB.second->getBufferSize(), 0);
322 Diags.Report(diag::err_fe_remap_missing_from_file) << RB.first;
323 if (!InitOpts.RetainRemappedFileBuffers)
328 // Override the contents of the "from" file with the contents of
330 SourceMgr.overrideFileContents(FromFile, RB.second,
331 InitOpts.RetainRemappedFileBuffers);
334 // Remap files in the source manager (with other files).
335 for (const auto &RF : InitOpts.RemappedFiles) {
336 // Find the file that we're mapping to.
337 const FileEntry *ToFile = FileMgr.getFile(RF.second);
339 Diags.Report(diag::err_fe_remap_missing_to_file) << RF.first << RF.second;
343 // Create the file entry for the file that we're mapping from.
344 const FileEntry *FromFile =
345 FileMgr.getVirtualFile(RF.first, ToFile->getSize(), 0);
347 Diags.Report(diag::err_fe_remap_missing_from_file) << RF.first;
351 // Override the contents of the "from" file with the contents of
353 SourceMgr.overrideFileContents(FromFile, ToFile);
356 SourceMgr.setOverridenFilesKeepOriginalName(
357 InitOpts.RemappedFilesKeepOriginalName);
362 void CompilerInstance::createPreprocessor(TranslationUnitKind TUKind) {
363 const PreprocessorOptions &PPOpts = getPreprocessorOpts();
365 // Create a PTH manager if we are using some form of a token cache.
366 PTHManager *PTHMgr = nullptr;
367 if (!PPOpts.TokenCache.empty())
368 PTHMgr = PTHManager::Create(PPOpts.TokenCache, getDiagnostics());
370 // Create the Preprocessor.
371 HeaderSearch *HeaderInfo =
372 new HeaderSearch(getHeaderSearchOptsPtr(), getSourceManager(),
373 getDiagnostics(), getLangOpts(), &getTarget());
374 PP = std::make_shared<Preprocessor>(
375 Invocation->getPreprocessorOptsPtr(), getDiagnostics(), getLangOpts(),
376 getSourceManager(), *HeaderInfo, *this, PTHMgr,
377 /*OwnsHeaderSearch=*/true, TUKind);
378 PP->Initialize(getTarget(), getAuxTarget());
380 // Note that this is different then passing PTHMgr to Preprocessor's ctor.
381 // That argument is used as the IdentifierInfoLookup argument to
382 // IdentifierTable's ctor.
384 PTHMgr->setPreprocessor(&*PP);
385 PP->setPTHManager(PTHMgr);
388 if (PPOpts.DetailedRecord)
389 PP->createPreprocessingRecord();
391 // Apply remappings to the source manager.
392 InitializeFileRemapping(PP->getDiagnostics(), PP->getSourceManager(),
393 PP->getFileManager(), PPOpts);
395 // Predefine macros and configure the preprocessor.
396 InitializePreprocessor(*PP, PPOpts, getPCHContainerReader(),
399 // Initialize the header search object. In CUDA compilations, we use the aux
400 // triple (the host triple) to initialize our header search, since we need to
401 // find the host headers in order to compile the CUDA code.
402 const llvm::Triple *HeaderSearchTriple = &PP->getTargetInfo().getTriple();
403 if (PP->getTargetInfo().getTriple().getOS() == llvm::Triple::CUDA &&
404 PP->getAuxTargetInfo())
405 HeaderSearchTriple = &PP->getAuxTargetInfo()->getTriple();
407 ApplyHeaderSearchOptions(PP->getHeaderSearchInfo(), getHeaderSearchOpts(),
408 PP->getLangOpts(), *HeaderSearchTriple);
410 PP->setPreprocessedOutput(getPreprocessorOutputOpts().ShowCPP);
412 if (PP->getLangOpts().Modules && PP->getLangOpts().ImplicitModules)
413 PP->getHeaderSearchInfo().setModuleCachePath(getSpecificModuleCachePath());
415 // Handle generating dependencies, if requested.
416 const DependencyOutputOptions &DepOpts = getDependencyOutputOpts();
417 if (!DepOpts.OutputFile.empty())
418 TheDependencyFileGenerator.reset(
419 DependencyFileGenerator::CreateAndAttachToPreprocessor(*PP, DepOpts));
420 if (!DepOpts.DOTOutputFile.empty())
421 AttachDependencyGraphGen(*PP, DepOpts.DOTOutputFile,
422 getHeaderSearchOpts().Sysroot);
424 // If we don't have a collector, but we are collecting module dependencies,
425 // then we're the top level compiler instance and need to create one.
426 if (!ModuleDepCollector && !DepOpts.ModuleDependencyOutputDir.empty()) {
427 ModuleDepCollector = std::make_shared<ModuleDependencyCollector>(
428 DepOpts.ModuleDependencyOutputDir);
431 // If there is a module dep collector, register with other dep collectors
432 // and also (a) collect header maps and (b) TODO: input vfs overlay files.
433 if (ModuleDepCollector) {
434 addDependencyCollector(ModuleDepCollector);
435 collectHeaderMaps(PP->getHeaderSearchInfo(), ModuleDepCollector);
436 collectIncludePCH(*this, ModuleDepCollector);
437 collectVFSEntries(*this, ModuleDepCollector);
440 for (auto &Listener : DependencyCollectors)
441 Listener->attachToPreprocessor(*PP);
443 // Handle generating header include information, if requested.
444 if (DepOpts.ShowHeaderIncludes)
445 AttachHeaderIncludeGen(*PP, DepOpts);
446 if (!DepOpts.HeaderIncludeOutputFile.empty()) {
447 StringRef OutputPath = DepOpts.HeaderIncludeOutputFile;
448 if (OutputPath == "-")
450 AttachHeaderIncludeGen(*PP, DepOpts,
451 /*ShowAllHeaders=*/true, OutputPath,
452 /*ShowDepth=*/false);
455 if (DepOpts.PrintShowIncludes) {
456 AttachHeaderIncludeGen(*PP, DepOpts,
457 /*ShowAllHeaders=*/true, /*OutputPath=*/"",
458 /*ShowDepth=*/true, /*MSStyle=*/true);
462 std::string CompilerInstance::getSpecificModuleCachePath() {
463 // Set up the module path, including the hash for the
464 // module-creation options.
465 SmallString<256> SpecificModuleCache(getHeaderSearchOpts().ModuleCachePath);
466 if (!SpecificModuleCache.empty() && !getHeaderSearchOpts().DisableModuleHash)
467 llvm::sys::path::append(SpecificModuleCache,
468 getInvocation().getModuleHash());
469 return SpecificModuleCache.str();
474 void CompilerInstance::createASTContext() {
475 Preprocessor &PP = getPreprocessor();
476 auto *Context = new ASTContext(getLangOpts(), PP.getSourceManager(),
477 PP.getIdentifierTable(), PP.getSelectorTable(),
478 PP.getBuiltinInfo());
479 Context->InitBuiltinTypes(getTarget(), getAuxTarget());
480 setASTContext(Context);
485 void CompilerInstance::createPCHExternalASTSource(
486 StringRef Path, bool DisablePCHValidation, bool AllowPCHWithCompilerErrors,
487 void *DeserializationListener, bool OwnDeserializationListener) {
488 bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0;
489 ModuleManager = createPCHExternalASTSource(
490 Path, getHeaderSearchOpts().Sysroot, DisablePCHValidation,
491 AllowPCHWithCompilerErrors, getPreprocessor(), getASTContext(),
492 getPCHContainerReader(),
493 getFrontendOpts().ModuleFileExtensions,
494 DeserializationListener,
495 OwnDeserializationListener, Preamble,
496 getFrontendOpts().UseGlobalModuleIndex);
499 IntrusiveRefCntPtr<ASTReader> CompilerInstance::createPCHExternalASTSource(
500 StringRef Path, StringRef Sysroot, bool DisablePCHValidation,
501 bool AllowPCHWithCompilerErrors, Preprocessor &PP, ASTContext &Context,
502 const PCHContainerReader &PCHContainerRdr,
503 ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
504 void *DeserializationListener, bool OwnDeserializationListener,
505 bool Preamble, bool UseGlobalModuleIndex) {
506 HeaderSearchOptions &HSOpts = PP.getHeaderSearchInfo().getHeaderSearchOpts();
508 IntrusiveRefCntPtr<ASTReader> Reader(new ASTReader(
509 PP, Context, PCHContainerRdr, Extensions,
510 Sysroot.empty() ? "" : Sysroot.data(), DisablePCHValidation,
511 AllowPCHWithCompilerErrors, /*AllowConfigurationMismatch*/ false,
512 HSOpts.ModulesValidateSystemHeaders, UseGlobalModuleIndex));
514 // We need the external source to be set up before we read the AST, because
515 // eagerly-deserialized declarations may use it.
516 Context.setExternalSource(Reader.get());
518 Reader->setDeserializationListener(
519 static_cast<ASTDeserializationListener *>(DeserializationListener),
520 /*TakeOwnership=*/OwnDeserializationListener);
521 switch (Reader->ReadAST(Path,
522 Preamble ? serialization::MK_Preamble
523 : serialization::MK_PCH,
525 ASTReader::ARR_None)) {
526 case ASTReader::Success:
527 // Set the predefines buffer as suggested by the PCH reader. Typically, the
528 // predefines buffer will be empty.
529 PP.setPredefines(Reader->getSuggestedPredefines());
532 case ASTReader::Failure:
533 // Unrecoverable failure: don't even try to process the input file.
536 case ASTReader::Missing:
537 case ASTReader::OutOfDate:
538 case ASTReader::VersionMismatch:
539 case ASTReader::ConfigurationMismatch:
540 case ASTReader::HadErrors:
541 // No suitable PCH file could be found. Return an error.
545 Context.setExternalSource(nullptr);
551 static bool EnableCodeCompletion(Preprocessor &PP,
555 // Tell the source manager to chop off the given file at a specific
557 const FileEntry *Entry = PP.getFileManager().getFile(Filename);
559 PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file)
564 // Truncate the named file at the given line/column.
565 PP.SetCodeCompletionPoint(Entry, Line, Column);
569 void CompilerInstance::createCodeCompletionConsumer() {
570 const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt;
571 if (!CompletionConsumer) {
572 setCodeCompletionConsumer(
573 createCodeCompletionConsumer(getPreprocessor(),
574 Loc.FileName, Loc.Line, Loc.Column,
575 getFrontendOpts().CodeCompleteOpts,
577 if (!CompletionConsumer)
579 } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName,
580 Loc.Line, Loc.Column)) {
581 setCodeCompletionConsumer(nullptr);
585 if (CompletionConsumer->isOutputBinary() &&
586 llvm::sys::ChangeStdoutToBinary()) {
587 getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary);
588 setCodeCompletionConsumer(nullptr);
592 void CompilerInstance::createFrontendTimer() {
593 FrontendTimerGroup.reset(
594 new llvm::TimerGroup("frontend", "Clang front-end time report"));
596 new llvm::Timer("frontend", "Clang front-end timer",
597 *FrontendTimerGroup));
600 CodeCompleteConsumer *
601 CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
605 const CodeCompleteOptions &Opts,
607 if (EnableCodeCompletion(PP, Filename, Line, Column))
610 // Set up the creation routine for code-completion.
611 return new PrintingCodeCompleteConsumer(Opts, OS);
614 void CompilerInstance::createSema(TranslationUnitKind TUKind,
615 CodeCompleteConsumer *CompletionConsumer) {
616 TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(),
617 TUKind, CompletionConsumer));
618 // Attach the external sema source if there is any.
619 if (ExternalSemaSrc) {
620 TheSema->addExternalSource(ExternalSemaSrc.get());
621 ExternalSemaSrc->InitializeSema(*TheSema);
627 void CompilerInstance::addOutputFile(OutputFile &&OutFile) {
628 OutputFiles.push_back(std::move(OutFile));
631 void CompilerInstance::clearOutputFiles(bool EraseFiles) {
632 for (OutputFile &OF : OutputFiles) {
633 if (!OF.TempFilename.empty()) {
635 llvm::sys::fs::remove(OF.TempFilename);
637 SmallString<128> NewOutFile(OF.Filename);
639 // If '-working-directory' was passed, the output filename should be
641 FileMgr->FixupRelativePath(NewOutFile);
642 if (std::error_code ec =
643 llvm::sys::fs::rename(OF.TempFilename, NewOutFile)) {
644 getDiagnostics().Report(diag::err_unable_to_rename_temp)
645 << OF.TempFilename << OF.Filename << ec.message();
647 llvm::sys::fs::remove(OF.TempFilename);
650 } else if (!OF.Filename.empty() && EraseFiles)
651 llvm::sys::fs::remove(OF.Filename);
654 NonSeekStream.reset();
657 std::unique_ptr<raw_pwrite_stream>
658 CompilerInstance::createDefaultOutputFile(bool Binary, StringRef InFile,
659 StringRef Extension) {
660 return createOutputFile(getFrontendOpts().OutputFile, Binary,
661 /*RemoveFileOnSignal=*/true, InFile, Extension,
662 /*UseTemporary=*/true);
665 std::unique_ptr<raw_pwrite_stream> CompilerInstance::createNullOutputFile() {
666 return llvm::make_unique<llvm::raw_null_ostream>();
669 std::unique_ptr<raw_pwrite_stream>
670 CompilerInstance::createOutputFile(StringRef OutputPath, bool Binary,
671 bool RemoveFileOnSignal, StringRef InFile,
672 StringRef Extension, bool UseTemporary,
673 bool CreateMissingDirectories) {
674 std::string OutputPathName, TempPathName;
676 std::unique_ptr<raw_pwrite_stream> OS = createOutputFile(
677 OutputPath, EC, Binary, RemoveFileOnSignal, InFile, Extension,
678 UseTemporary, CreateMissingDirectories, &OutputPathName, &TempPathName);
680 getDiagnostics().Report(diag::err_fe_unable_to_open_output) << OutputPath
685 // Add the output file -- but don't try to remove "-", since this means we are
688 OutputFile((OutputPathName != "-") ? OutputPathName : "", TempPathName));
693 std::unique_ptr<llvm::raw_pwrite_stream> CompilerInstance::createOutputFile(
694 StringRef OutputPath, std::error_code &Error, bool Binary,
695 bool RemoveFileOnSignal, StringRef InFile, StringRef Extension,
696 bool UseTemporary, bool CreateMissingDirectories,
697 std::string *ResultPathName, std::string *TempPathName) {
698 assert((!CreateMissingDirectories || UseTemporary) &&
699 "CreateMissingDirectories is only allowed when using temporary files");
701 std::string OutFile, TempFile;
702 if (!OutputPath.empty()) {
703 OutFile = OutputPath;
704 } else if (InFile == "-") {
706 } else if (!Extension.empty()) {
707 SmallString<128> Path(InFile);
708 llvm::sys::path::replace_extension(Path, Extension);
709 OutFile = Path.str();
714 std::unique_ptr<llvm::raw_fd_ostream> OS;
719 UseTemporary = false;
721 llvm::sys::fs::file_status Status;
722 llvm::sys::fs::status(OutputPath, Status);
723 if (llvm::sys::fs::exists(Status)) {
724 // Fail early if we can't write to the final destination.
725 if (!llvm::sys::fs::can_write(OutputPath)) {
726 Error = make_error_code(llvm::errc::operation_not_permitted);
730 // Don't use a temporary if the output is a special file. This handles
731 // things like '-o /dev/null'
732 if (!llvm::sys::fs::is_regular_file(Status))
733 UseTemporary = false;
739 // Create a temporary file.
740 SmallString<128> TempPath;
742 TempPath += "-%%%%%%%%";
745 llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath);
747 if (CreateMissingDirectories &&
748 EC == llvm::errc::no_such_file_or_directory) {
749 StringRef Parent = llvm::sys::path::parent_path(OutputPath);
750 EC = llvm::sys::fs::create_directories(Parent);
752 EC = llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath);
757 OS.reset(new llvm::raw_fd_ostream(fd, /*shouldClose=*/true));
758 OSFile = TempFile = TempPath.str();
760 // If we failed to create the temporary, fallback to writing to the file
761 // directly. This handles the corner case where we cannot write to the
762 // directory, but can write to the file.
767 OS.reset(new llvm::raw_fd_ostream(
769 (Binary ? llvm::sys::fs::F_None : llvm::sys::fs::F_Text)));
774 // Make sure the out stream file gets removed if we crash.
775 if (RemoveFileOnSignal)
776 llvm::sys::RemoveFileOnSignal(OSFile);
779 *ResultPathName = OutFile;
781 *TempPathName = TempFile;
783 if (!Binary || OS->supportsSeeking())
784 return std::move(OS);
786 auto B = llvm::make_unique<llvm::buffer_ostream>(*OS);
787 assert(!NonSeekStream);
788 NonSeekStream = std::move(OS);
792 // Initialization Utilities
794 bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input){
795 return InitializeSourceManager(
796 Input, getDiagnostics(), getFileManager(), getSourceManager(),
797 hasPreprocessor() ? &getPreprocessor().getHeaderSearchInfo() : nullptr,
798 getDependencyOutputOpts(), getFrontendOpts());
802 bool CompilerInstance::InitializeSourceManager(
803 const FrontendInputFile &Input, DiagnosticsEngine &Diags,
804 FileManager &FileMgr, SourceManager &SourceMgr, HeaderSearch *HS,
805 DependencyOutputOptions &DepOpts, const FrontendOptions &Opts) {
806 SrcMgr::CharacteristicKind
807 Kind = Input.isSystem() ? SrcMgr::C_System : SrcMgr::C_User;
809 if (Input.isBuffer()) {
810 SourceMgr.setMainFileID(SourceMgr.createFileID(
811 std::unique_ptr<llvm::MemoryBuffer>(Input.getBuffer()), Kind));
812 assert(SourceMgr.getMainFileID().isValid() &&
813 "Couldn't establish MainFileID!");
817 StringRef InputFile = Input.getFile();
819 // Figure out where to get and map in the main file.
820 if (InputFile != "-") {
821 const FileEntry *File;
822 if (Opts.FindPchSource.empty()) {
823 File = FileMgr.getFile(InputFile, /*OpenFile=*/true);
825 // When building a pch file in clang-cl mode, the .h file is built as if
826 // it was included by a cc file. Since the driver doesn't know about
827 // all include search directories, the frontend must search the input
828 // file through HeaderSearch here, as if it had been included by the
829 // cc file at Opts.FindPchSource.
830 const FileEntry *FindFile = FileMgr.getFile(Opts.FindPchSource);
832 Diags.Report(diag::err_fe_error_reading) << Opts.FindPchSource;
835 const DirectoryLookup *UnusedCurDir;
836 SmallVector<std::pair<const FileEntry *, const DirectoryEntry *>, 16>
838 Includers.push_back(std::make_pair(FindFile, FindFile->getDir()));
839 File = HS->LookupFile(InputFile, SourceLocation(), /*isAngled=*/false,
841 /*CurDir=*/UnusedCurDir, Includers,
842 /*SearchPath=*/nullptr,
843 /*RelativePath=*/nullptr,
844 /*RequestingModule=*/nullptr,
845 /*SuggestedModule=*/nullptr, /*SkipCache=*/true);
846 // Also add the header to /showIncludes output.
848 DepOpts.ShowIncludesPretendHeader = File->getName();
851 Diags.Report(diag::err_fe_error_reading) << InputFile;
855 // The natural SourceManager infrastructure can't currently handle named
856 // pipes, but we would at least like to accept them for the main
857 // file. Detect them here, read them with the volatile flag so FileMgr will
858 // pick up the correct size, and simply override their contents as we do for
860 if (File->isNamedPipe()) {
861 auto MB = FileMgr.getBufferForFile(File, /*isVolatile=*/true);
863 // Create a new virtual file that will have the correct size.
864 File = FileMgr.getVirtualFile(InputFile, (*MB)->getBufferSize(), 0);
865 SourceMgr.overrideFileContents(File, std::move(*MB));
867 Diags.Report(diag::err_cannot_open_file) << InputFile
868 << MB.getError().message();
873 SourceMgr.setMainFileID(
874 SourceMgr.createFileID(File, SourceLocation(), Kind));
876 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> SBOrErr =
877 llvm::MemoryBuffer::getSTDIN();
878 if (std::error_code EC = SBOrErr.getError()) {
879 Diags.Report(diag::err_fe_error_reading_stdin) << EC.message();
882 std::unique_ptr<llvm::MemoryBuffer> SB = std::move(SBOrErr.get());
884 const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
885 SB->getBufferSize(), 0);
886 SourceMgr.setMainFileID(
887 SourceMgr.createFileID(File, SourceLocation(), Kind));
888 SourceMgr.overrideFileContents(File, std::move(SB));
891 assert(SourceMgr.getMainFileID().isValid() &&
892 "Couldn't establish MainFileID!");
896 // High-Level Operations
898 bool CompilerInstance::ExecuteAction(FrontendAction &Act) {
899 assert(hasDiagnostics() && "Diagnostics engine is not initialized!");
900 assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!");
901 assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!");
903 // FIXME: Take this as an argument, once all the APIs we used have moved to
904 // taking it as an input instead of hard-coding llvm::errs.
905 raw_ostream &OS = llvm::errs();
907 // Create the target instance.
908 setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(),
909 getInvocation().TargetOpts));
913 // Create TargetInfo for the other side of CUDA compilation.
914 if (getLangOpts().CUDA && !getFrontendOpts().AuxTriple.empty()) {
915 auto TO = std::make_shared<TargetOptions>();
916 TO->Triple = getFrontendOpts().AuxTriple;
917 TO->HostTriple = getTarget().getTriple().str();
918 setAuxTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), TO));
921 // Inform the target of the language options.
923 // FIXME: We shouldn't need to do this, the target should be immutable once
924 // created. This complexity should be lifted elsewhere.
925 getTarget().adjust(getLangOpts());
927 // Adjust target options based on codegen options.
928 getTarget().adjustTargetOptions(getCodeGenOpts(), getTargetOpts());
930 // rewriter project will change target built-in bool type from its default.
931 if (getFrontendOpts().ProgramAction == frontend::RewriteObjC)
932 getTarget().noSignedCharForObjCBool();
934 // Validate/process some options.
935 if (getHeaderSearchOpts().Verbose)
936 OS << "clang -cc1 version " CLANG_VERSION_STRING
937 << " based upon " << BACKEND_PACKAGE_STRING
938 << " default target " << llvm::sys::getDefaultTargetTriple() << "\n";
940 if (getFrontendOpts().ShowTimers)
941 createFrontendTimer();
943 if (getFrontendOpts().ShowStats || !getFrontendOpts().StatsFile.empty())
944 llvm::EnableStatistics(false);
946 for (const FrontendInputFile &FIF : getFrontendOpts().Inputs) {
947 // Reset the ID tables if we are reusing the SourceManager and parsing
949 if (hasSourceManager() && !Act.isModelParsingAction())
950 getSourceManager().clearIDTables();
952 if (Act.BeginSourceFile(*this, FIF)) {
958 // Notify the diagnostic client that all files were processed.
959 getDiagnostics().getClient()->finish();
961 if (getDiagnosticOpts().ShowCarets) {
962 // We can have multiple diagnostics sharing one diagnostic client.
963 // Get the total number of warnings/errors from the client.
964 unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings();
965 unsigned NumErrors = getDiagnostics().getClient()->getNumErrors();
968 OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s");
969 if (NumWarnings && NumErrors)
972 OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s");
973 if (NumWarnings || NumErrors)
974 OS << " generated.\n";
977 if (getFrontendOpts().ShowStats) {
978 if (hasFileManager()) {
979 getFileManager().PrintStats();
982 llvm::PrintStatistics(OS);
984 StringRef StatsFile = getFrontendOpts().StatsFile;
985 if (!StatsFile.empty()) {
987 auto StatS = llvm::make_unique<llvm::raw_fd_ostream>(StatsFile, EC,
988 llvm::sys::fs::F_Text);
990 getDiagnostics().Report(diag::warn_fe_unable_to_open_stats_file)
991 << StatsFile << EC.message();
993 llvm::PrintStatisticsJSON(*StatS);
997 return !getDiagnostics().getClient()->getNumErrors();
1000 /// \brief Determine the appropriate source input kind based on language
1002 static InputKind getSourceInputKindFromOptions(const LangOptions &LangOpts) {
1003 if (LangOpts.OpenCL)
1008 return LangOpts.CPlusPlus? IK_ObjCXX : IK_ObjC;
1009 return LangOpts.CPlusPlus? IK_CXX : IK_C;
1012 /// \brief Compile a module file for the given module, using the options
1013 /// provided by the importing compiler instance. Returns true if the module
1014 /// was built without errors.
1015 static bool compileModuleImpl(CompilerInstance &ImportingInstance,
1016 SourceLocation ImportLoc,
1018 StringRef ModuleFileName) {
1020 = ImportingInstance.getPreprocessor().getHeaderSearchInfo().getModuleMap();
1022 // Construct a compiler invocation for creating this module.
1024 std::make_shared<CompilerInvocation>(ImportingInstance.getInvocation());
1026 PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts();
1028 // For any options that aren't intended to affect how a module is built,
1029 // reset them to their default values.
1030 Invocation->getLangOpts()->resetNonModularOptions();
1031 PPOpts.resetNonModularOptions();
1033 // Remove any macro definitions that are explicitly ignored by the module.
1034 // They aren't supposed to affect how the module is built anyway.
1035 const HeaderSearchOptions &HSOpts = Invocation->getHeaderSearchOpts();
1036 PPOpts.Macros.erase(
1037 std::remove_if(PPOpts.Macros.begin(), PPOpts.Macros.end(),
1038 [&HSOpts](const std::pair<std::string, bool> &def) {
1039 StringRef MacroDef = def.first;
1040 return HSOpts.ModulesIgnoreMacros.count(
1041 llvm::CachedHashString(MacroDef.split('=').first)) > 0;
1043 PPOpts.Macros.end());
1045 // Note the name of the module we're building.
1046 Invocation->getLangOpts()->CurrentModule = Module->getTopLevelModuleName();
1048 // Make sure that the failed-module structure has been allocated in
1049 // the importing instance, and propagate the pointer to the newly-created
1051 PreprocessorOptions &ImportingPPOpts
1052 = ImportingInstance.getInvocation().getPreprocessorOpts();
1053 if (!ImportingPPOpts.FailedModules)
1054 ImportingPPOpts.FailedModules =
1055 std::make_shared<PreprocessorOptions::FailedModulesSet>();
1056 PPOpts.FailedModules = ImportingPPOpts.FailedModules;
1058 // If there is a module map file, build the module using the module map.
1059 // Set up the inputs/outputs so that we build the module from its umbrella
1061 FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
1062 FrontendOpts.OutputFile = ModuleFileName.str();
1063 FrontendOpts.DisableFree = false;
1064 FrontendOpts.GenerateGlobalModuleIndex = false;
1065 FrontendOpts.BuildingImplicitModule = true;
1066 FrontendOpts.Inputs.clear();
1067 InputKind IK = getSourceInputKindFromOptions(*Invocation->getLangOpts());
1069 // Don't free the remapped file buffers; they are owned by our caller.
1070 PPOpts.RetainRemappedFileBuffers = true;
1072 Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
1073 assert(ImportingInstance.getInvocation().getModuleHash() ==
1074 Invocation->getModuleHash() && "Module hash mismatch!");
1076 // Construct a compiler instance that will be used to actually create the
1078 CompilerInstance Instance(ImportingInstance.getPCHContainerOperations(),
1079 /*BuildingModule=*/true);
1080 auto &Inv = *Invocation;
1081 Instance.setInvocation(std::move(Invocation));
1083 Instance.createDiagnostics(new ForwardingDiagnosticConsumer(
1084 ImportingInstance.getDiagnosticClient()),
1085 /*ShouldOwnClient=*/true);
1087 Instance.setVirtualFileSystem(&ImportingInstance.getVirtualFileSystem());
1089 // Note that this module is part of the module build stack, so that we
1090 // can detect cycles in the module graph.
1091 Instance.setFileManager(&ImportingInstance.getFileManager());
1092 Instance.createSourceManager(Instance.getFileManager());
1093 SourceManager &SourceMgr = Instance.getSourceManager();
1094 SourceMgr.setModuleBuildStack(
1095 ImportingInstance.getSourceManager().getModuleBuildStack());
1096 SourceMgr.pushModuleBuildStack(Module->getTopLevelModuleName(),
1097 FullSourceLoc(ImportLoc, ImportingInstance.getSourceManager()));
1099 // If we're collecting module dependencies, we need to share a collector
1100 // between all of the module CompilerInstances. Other than that, we don't
1101 // want to produce any dependency output from the module build.
1102 Instance.setModuleDepCollector(ImportingInstance.getModuleDepCollector());
1103 Inv.getDependencyOutputOpts() = DependencyOutputOptions();
1105 // Get or create the module map that we'll use to build this module.
1106 std::string InferredModuleMapContent;
1107 if (const FileEntry *ModuleMapFile =
1108 ModMap.getContainingModuleMapFile(Module)) {
1109 // Use the module map where this module resides.
1110 FrontendOpts.Inputs.emplace_back(ModuleMapFile->getName(), IK);
1112 SmallString<128> FakeModuleMapFile(Module->Directory->getName());
1113 llvm::sys::path::append(FakeModuleMapFile, "__inferred_module.map");
1114 FrontendOpts.Inputs.emplace_back(FakeModuleMapFile, IK);
1116 llvm::raw_string_ostream OS(InferredModuleMapContent);
1120 std::unique_ptr<llvm::MemoryBuffer> ModuleMapBuffer =
1121 llvm::MemoryBuffer::getMemBuffer(InferredModuleMapContent);
1122 ModuleMapFile = Instance.getFileManager().getVirtualFile(
1123 FakeModuleMapFile, InferredModuleMapContent.size(), 0);
1124 SourceMgr.overrideFileContents(ModuleMapFile, std::move(ModuleMapBuffer));
1127 // Construct a module-generating action. Passing through the module map is
1128 // safe because the FileManager is shared between the compiler instances.
1129 GenerateModuleFromModuleMapAction CreateModuleAction(
1130 ModMap.getModuleMapFileForUniquing(Module), Module->IsSystem);
1132 ImportingInstance.getDiagnostics().Report(ImportLoc,
1133 diag::remark_module_build)
1134 << Module->Name << ModuleFileName;
1136 // Execute the action to actually build the module in-place. Use a separate
1137 // thread so that we get a stack large enough.
1138 const unsigned ThreadStackSize = 8 << 20;
1139 llvm::CrashRecoveryContext CRC;
1140 CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(CreateModuleAction); },
1143 ImportingInstance.getDiagnostics().Report(ImportLoc,
1144 diag::remark_module_build_done)
1147 // Delete the temporary module map file.
1148 // FIXME: Even though we're executing under crash protection, it would still
1149 // be nice to do this with RemoveFileOnSignal when we can. However, that
1150 // doesn't make sense for all clients, so clean this up manually.
1151 Instance.clearOutputFiles(/*EraseFiles=*/true);
1153 // We've rebuilt a module. If we're allowed to generate or update the global
1154 // module index, record that fact in the importing compiler instance.
1155 if (ImportingInstance.getFrontendOpts().GenerateGlobalModuleIndex) {
1156 ImportingInstance.setBuildGlobalModuleIndex(true);
1159 return !Instance.getDiagnostics().hasErrorOccurred();
1162 static bool compileAndLoadModule(CompilerInstance &ImportingInstance,
1163 SourceLocation ImportLoc,
1164 SourceLocation ModuleNameLoc, Module *Module,
1165 StringRef ModuleFileName) {
1166 DiagnosticsEngine &Diags = ImportingInstance.getDiagnostics();
1168 auto diagnoseBuildFailure = [&] {
1169 Diags.Report(ModuleNameLoc, diag::err_module_not_built)
1170 << Module->Name << SourceRange(ImportLoc, ModuleNameLoc);
1173 // FIXME: have LockFileManager return an error_code so that we can
1174 // avoid the mkdir when the directory already exists.
1175 StringRef Dir = llvm::sys::path::parent_path(ModuleFileName);
1176 llvm::sys::fs::create_directories(Dir);
1179 unsigned ModuleLoadCapabilities = ASTReader::ARR_Missing;
1180 llvm::LockFileManager Locked(ModuleFileName);
1182 case llvm::LockFileManager::LFS_Error:
1183 Diags.Report(ModuleNameLoc, diag::err_module_lock_failure)
1184 << Module->Name << Locked.getErrorMessage();
1187 case llvm::LockFileManager::LFS_Owned:
1188 // We're responsible for building the module ourselves.
1189 if (!compileModuleImpl(ImportingInstance, ModuleNameLoc, Module,
1191 diagnoseBuildFailure();
1196 case llvm::LockFileManager::LFS_Shared:
1197 // Someone else is responsible for building the module. Wait for them to
1199 switch (Locked.waitForUnlock()) {
1200 case llvm::LockFileManager::Res_Success:
1201 ModuleLoadCapabilities |= ASTReader::ARR_OutOfDate;
1203 case llvm::LockFileManager::Res_OwnerDied:
1204 continue; // try again to get the lock.
1205 case llvm::LockFileManager::Res_Timeout:
1206 Diags.Report(ModuleNameLoc, diag::err_module_lock_timeout)
1208 // Clear the lock file so that future invokations can make progress.
1209 Locked.unsafeRemoveLockFile();
1215 // Try to read the module file, now that we've compiled it.
1216 ASTReader::ASTReadResult ReadResult =
1217 ImportingInstance.getModuleManager()->ReadAST(
1218 ModuleFileName, serialization::MK_ImplicitModule, ImportLoc,
1219 ModuleLoadCapabilities);
1221 if (ReadResult == ASTReader::OutOfDate &&
1222 Locked == llvm::LockFileManager::LFS_Shared) {
1223 // The module may be out of date in the presence of file system races,
1224 // or if one of its imports depends on header search paths that are not
1225 // consistent with this ImportingInstance. Try again...
1227 } else if (ReadResult == ASTReader::Missing) {
1228 diagnoseBuildFailure();
1229 } else if (ReadResult != ASTReader::Success &&
1230 !Diags.hasErrorOccurred()) {
1231 // The ASTReader didn't diagnose the error, so conservatively report it.
1232 diagnoseBuildFailure();
1234 return ReadResult == ASTReader::Success;
1238 /// \brief Diagnose differences between the current definition of the given
1239 /// configuration macro and the definition provided on the command line.
1240 static void checkConfigMacro(Preprocessor &PP, StringRef ConfigMacro,
1241 Module *Mod, SourceLocation ImportLoc) {
1242 IdentifierInfo *Id = PP.getIdentifierInfo(ConfigMacro);
1243 SourceManager &SourceMgr = PP.getSourceManager();
1245 // If this identifier has never had a macro definition, then it could
1246 // not have changed.
1247 if (!Id->hadMacroDefinition())
1249 auto *LatestLocalMD = PP.getLocalMacroDirectiveHistory(Id);
1251 // Find the macro definition from the command line.
1252 MacroInfo *CmdLineDefinition = nullptr;
1253 for (auto *MD = LatestLocalMD; MD; MD = MD->getPrevious()) {
1254 // We only care about the predefines buffer.
1255 FileID FID = SourceMgr.getFileID(MD->getLocation());
1256 if (FID.isInvalid() || FID != PP.getPredefinesFileID())
1258 if (auto *DMD = dyn_cast<DefMacroDirective>(MD))
1259 CmdLineDefinition = DMD->getMacroInfo();
1263 auto *CurrentDefinition = PP.getMacroInfo(Id);
1264 if (CurrentDefinition == CmdLineDefinition) {
1265 // Macro matches. Nothing to do.
1266 } else if (!CurrentDefinition) {
1267 // This macro was defined on the command line, then #undef'd later.
1269 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1270 << true << ConfigMacro << Mod->getFullModuleName();
1271 auto LatestDef = LatestLocalMD->getDefinition();
1272 assert(LatestDef.isUndefined() &&
1273 "predefined macro went away with no #undef?");
1274 PP.Diag(LatestDef.getUndefLocation(), diag::note_module_def_undef_here)
1277 } else if (!CmdLineDefinition) {
1278 // There was no definition for this macro in the predefines buffer,
1279 // but there was a local definition. Complain.
1280 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1281 << false << ConfigMacro << Mod->getFullModuleName();
1282 PP.Diag(CurrentDefinition->getDefinitionLoc(),
1283 diag::note_module_def_undef_here)
1285 } else if (!CurrentDefinition->isIdenticalTo(*CmdLineDefinition, PP,
1286 /*Syntactically=*/true)) {
1287 // The macro definitions differ.
1288 PP.Diag(ImportLoc, diag::warn_module_config_macro_undef)
1289 << false << ConfigMacro << Mod->getFullModuleName();
1290 PP.Diag(CurrentDefinition->getDefinitionLoc(),
1291 diag::note_module_def_undef_here)
1296 /// \brief Write a new timestamp file with the given path.
1297 static void writeTimestampFile(StringRef TimestampFile) {
1299 llvm::raw_fd_ostream Out(TimestampFile.str(), EC, llvm::sys::fs::F_None);
1302 /// \brief Prune the module cache of modules that haven't been accessed in
1304 static void pruneModuleCache(const HeaderSearchOptions &HSOpts) {
1305 struct stat StatBuf;
1306 llvm::SmallString<128> TimestampFile;
1307 TimestampFile = HSOpts.ModuleCachePath;
1308 assert(!TimestampFile.empty());
1309 llvm::sys::path::append(TimestampFile, "modules.timestamp");
1311 // Try to stat() the timestamp file.
1312 if (::stat(TimestampFile.c_str(), &StatBuf)) {
1313 // If the timestamp file wasn't there, create one now.
1314 if (errno == ENOENT) {
1315 writeTimestampFile(TimestampFile);
1320 // Check whether the time stamp is older than our pruning interval.
1321 // If not, do nothing.
1322 time_t TimeStampModTime = StatBuf.st_mtime;
1323 time_t CurrentTime = time(nullptr);
1324 if (CurrentTime - TimeStampModTime <= time_t(HSOpts.ModuleCachePruneInterval))
1327 // Write a new timestamp file so that nobody else attempts to prune.
1328 // There is a benign race condition here, if two Clang instances happen to
1329 // notice at the same time that the timestamp is out-of-date.
1330 writeTimestampFile(TimestampFile);
1332 // Walk the entire module cache, looking for unused module files and module
1335 SmallString<128> ModuleCachePathNative;
1336 llvm::sys::path::native(HSOpts.ModuleCachePath, ModuleCachePathNative);
1337 for (llvm::sys::fs::directory_iterator Dir(ModuleCachePathNative, EC), DirEnd;
1338 Dir != DirEnd && !EC; Dir.increment(EC)) {
1339 // If we don't have a directory, there's nothing to look into.
1340 if (!llvm::sys::fs::is_directory(Dir->path()))
1343 // Walk all of the files within this directory.
1344 for (llvm::sys::fs::directory_iterator File(Dir->path(), EC), FileEnd;
1345 File != FileEnd && !EC; File.increment(EC)) {
1346 // We only care about module and global module index files.
1347 StringRef Extension = llvm::sys::path::extension(File->path());
1348 if (Extension != ".pcm" && Extension != ".timestamp" &&
1349 llvm::sys::path::filename(File->path()) != "modules.idx")
1352 // Look at this file. If we can't stat it, there's nothing interesting
1354 if (::stat(File->path().c_str(), &StatBuf))
1357 // If the file has been used recently enough, leave it there.
1358 time_t FileAccessTime = StatBuf.st_atime;
1359 if (CurrentTime - FileAccessTime <=
1360 time_t(HSOpts.ModuleCachePruneAfter)) {
1365 llvm::sys::fs::remove(File->path());
1367 // Remove the timestamp file.
1368 std::string TimpestampFilename = File->path() + ".timestamp";
1369 llvm::sys::fs::remove(TimpestampFilename);
1372 // If we removed all of the files in the directory, remove the directory
1374 if (llvm::sys::fs::directory_iterator(Dir->path(), EC) ==
1375 llvm::sys::fs::directory_iterator() && !EC)
1376 llvm::sys::fs::remove(Dir->path());
1380 void CompilerInstance::createModuleManager() {
1381 if (!ModuleManager) {
1382 if (!hasASTContext())
1385 // If we're implicitly building modules but not currently recursively
1386 // building a module, check whether we need to prune the module cache.
1387 if (getSourceManager().getModuleBuildStack().empty() &&
1388 !getPreprocessor().getHeaderSearchInfo().getModuleCachePath().empty() &&
1389 getHeaderSearchOpts().ModuleCachePruneInterval > 0 &&
1390 getHeaderSearchOpts().ModuleCachePruneAfter > 0) {
1391 pruneModuleCache(getHeaderSearchOpts());
1394 HeaderSearchOptions &HSOpts = getHeaderSearchOpts();
1395 std::string Sysroot = HSOpts.Sysroot;
1396 const PreprocessorOptions &PPOpts = getPreprocessorOpts();
1397 std::unique_ptr<llvm::Timer> ReadTimer;
1398 if (FrontendTimerGroup)
1399 ReadTimer = llvm::make_unique<llvm::Timer>("reading_modules",
1401 *FrontendTimerGroup);
1402 ModuleManager = new ASTReader(
1403 getPreprocessor(), getASTContext(), getPCHContainerReader(),
1404 getFrontendOpts().ModuleFileExtensions,
1405 Sysroot.empty() ? "" : Sysroot.c_str(), PPOpts.DisablePCHValidation,
1406 /*AllowASTWithCompilerErrors=*/false,
1407 /*AllowConfigurationMismatch=*/false,
1408 HSOpts.ModulesValidateSystemHeaders,
1409 getFrontendOpts().UseGlobalModuleIndex,
1410 std::move(ReadTimer));
1411 if (hasASTConsumer()) {
1412 ModuleManager->setDeserializationListener(
1413 getASTConsumer().GetASTDeserializationListener());
1414 getASTContext().setASTMutationListener(
1415 getASTConsumer().GetASTMutationListener());
1417 getASTContext().setExternalSource(ModuleManager);
1419 ModuleManager->InitializeSema(getSema());
1420 if (hasASTConsumer())
1421 ModuleManager->StartTranslationUnit(&getASTConsumer());
1423 if (TheDependencyFileGenerator)
1424 TheDependencyFileGenerator->AttachToASTReader(*ModuleManager);
1425 for (auto &Listener : DependencyCollectors)
1426 Listener->attachToASTReader(*ModuleManager);
1430 bool CompilerInstance::loadModuleFile(StringRef FileName) {
1432 if (FrontendTimerGroup)
1433 Timer.init("preloading." + FileName.str(), "Preloading " + FileName.str(),
1434 *FrontendTimerGroup);
1435 llvm::TimeRegion TimeLoading(FrontendTimerGroup ? &Timer : nullptr);
1437 // Helper to recursively read the module names for all modules we're adding.
1438 // We mark these as known and redirect any attempt to load that module to
1439 // the files we were handed.
1440 struct ReadModuleNames : ASTReaderListener {
1441 CompilerInstance &CI;
1442 llvm::SmallVector<IdentifierInfo*, 8> LoadedModules;
1444 ReadModuleNames(CompilerInstance &CI) : CI(CI) {}
1446 void ReadModuleName(StringRef ModuleName) override {
1447 LoadedModules.push_back(
1448 CI.getPreprocessor().getIdentifierInfo(ModuleName));
1451 void registerAll() {
1452 for (auto *II : LoadedModules) {
1453 CI.KnownModules[II] = CI.getPreprocessor()
1454 .getHeaderSearchInfo()
1456 .findModule(II->getName());
1458 LoadedModules.clear();
1461 void markAllUnavailable() {
1462 for (auto *II : LoadedModules) {
1463 if (Module *M = CI.getPreprocessor()
1464 .getHeaderSearchInfo()
1466 .findModule(II->getName())) {
1467 M->HasIncompatibleModuleFile = true;
1469 // Mark module as available if the only reason it was unavailable
1470 // was missing headers.
1471 SmallVector<Module *, 2> Stack;
1473 while (!Stack.empty()) {
1474 Module *Current = Stack.pop_back_val();
1475 if (Current->IsMissingRequirement) continue;
1476 Current->IsAvailable = true;
1477 Stack.insert(Stack.end(),
1478 Current->submodule_begin(), Current->submodule_end());
1482 LoadedModules.clear();
1486 // If we don't already have an ASTReader, create one now.
1488 createModuleManager();
1490 auto Listener = llvm::make_unique<ReadModuleNames>(*this);
1491 auto &ListenerRef = *Listener;
1492 ASTReader::ListenerScope ReadModuleNamesListener(*ModuleManager,
1493 std::move(Listener));
1495 // Try to load the module file.
1496 switch (ModuleManager->ReadAST(FileName, serialization::MK_ExplicitModule,
1498 ASTReader::ARR_ConfigurationMismatch)) {
1499 case ASTReader::Success:
1500 // We successfully loaded the module file; remember the set of provided
1501 // modules so that we don't try to load implicit modules for them.
1502 ListenerRef.registerAll();
1505 case ASTReader::ConfigurationMismatch:
1506 // Ignore unusable module files.
1507 getDiagnostics().Report(SourceLocation(), diag::warn_module_config_mismatch)
1509 // All modules provided by any files we tried and failed to load are now
1510 // unavailable; includes of those modules should now be handled textually.
1511 ListenerRef.markAllUnavailable();
1520 CompilerInstance::loadModule(SourceLocation ImportLoc,
1522 Module::NameVisibilityKind Visibility,
1523 bool IsInclusionDirective) {
1524 // Determine what file we're searching from.
1525 StringRef ModuleName = Path[0].first->getName();
1526 SourceLocation ModuleNameLoc = Path[0].second;
1528 // If we've already handled this import, just return the cached result.
1529 // This one-element cache is important to eliminate redundant diagnostics
1530 // when both the preprocessor and parser see the same import declaration.
1531 if (ImportLoc.isValid() && LastModuleImportLoc == ImportLoc) {
1532 // Make the named module visible.
1533 if (LastModuleImportResult && ModuleName != getLangOpts().CurrentModule)
1534 ModuleManager->makeModuleVisible(LastModuleImportResult, Visibility,
1536 return LastModuleImportResult;
1539 clang::Module *Module = nullptr;
1541 // If we don't already have information on this module, load the module now.
1542 llvm::DenseMap<const IdentifierInfo *, clang::Module *>::iterator Known
1543 = KnownModules.find(Path[0].first);
1544 if (Known != KnownModules.end()) {
1545 // Retrieve the cached top-level module.
1546 Module = Known->second;
1547 } else if (ModuleName == getLangOpts().CurrentModule) {
1548 // This is the module we're building.
1549 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1550 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first;
1552 // Search for a module with the given name.
1553 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1554 HeaderSearchOptions &HSOpts =
1555 PP->getHeaderSearchInfo().getHeaderSearchOpts();
1557 std::string ModuleFileName;
1558 bool LoadFromPrebuiltModulePath = false;
1559 // We try to load the module from the prebuilt module paths. If not
1560 // successful, we then try to find it in the module cache.
1561 if (!HSOpts.PrebuiltModulePaths.empty()) {
1562 // Load the module from the prebuilt module path.
1563 ModuleFileName = PP->getHeaderSearchInfo().getModuleFileName(
1564 ModuleName, "", /*UsePrebuiltPath*/ true);
1565 if (!ModuleFileName.empty())
1566 LoadFromPrebuiltModulePath = true;
1568 if (!LoadFromPrebuiltModulePath && Module) {
1569 // Load the module from the module cache.
1570 ModuleFileName = PP->getHeaderSearchInfo().getModuleFileName(Module);
1571 } else if (!LoadFromPrebuiltModulePath) {
1572 // We can't find a module, error out here.
1573 getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_found)
1575 << SourceRange(ImportLoc, ModuleNameLoc);
1576 ModuleBuildFailed = true;
1577 return ModuleLoadResult();
1580 if (ModuleFileName.empty()) {
1581 if (Module && Module->HasIncompatibleModuleFile) {
1582 // We tried and failed to load a module file for this module. Fall
1583 // back to textual inclusion for its headers.
1584 return ModuleLoadResult::ConfigMismatch;
1587 getDiagnostics().Report(ModuleNameLoc, diag::err_module_build_disabled)
1589 ModuleBuildFailed = true;
1590 return ModuleLoadResult();
1593 // If we don't already have an ASTReader, create one now.
1595 createModuleManager();
1598 if (FrontendTimerGroup)
1599 Timer.init("loading." + ModuleFileName, "Loading " + ModuleFileName,
1600 *FrontendTimerGroup);
1601 llvm::TimeRegion TimeLoading(FrontendTimerGroup ? &Timer : nullptr);
1603 // Try to load the module file. If we are trying to load from the prebuilt
1604 // module path, we don't have the module map files and don't know how to
1606 unsigned ARRFlags = LoadFromPrebuiltModulePath ?
1607 ASTReader::ARR_ConfigurationMismatch :
1608 ASTReader::ARR_OutOfDate | ASTReader::ARR_Missing;
1609 switch (ModuleManager->ReadAST(ModuleFileName,
1610 LoadFromPrebuiltModulePath ?
1611 serialization::MK_PrebuiltModule :
1612 serialization::MK_ImplicitModule,
1615 case ASTReader::Success: {
1616 if (LoadFromPrebuiltModulePath && !Module) {
1617 Module = PP->getHeaderSearchInfo().lookupModule(ModuleName);
1618 if (!Module || !Module->getASTFile() ||
1619 FileMgr->getFile(ModuleFileName) != Module->getASTFile()) {
1620 // Error out if Module does not refer to the file in the prebuilt
1622 getDiagnostics().Report(ModuleNameLoc, diag::err_module_prebuilt)
1624 ModuleBuildFailed = true;
1625 KnownModules[Path[0].first] = nullptr;
1626 return ModuleLoadResult();
1632 case ASTReader::OutOfDate:
1633 case ASTReader::Missing: {
1634 if (LoadFromPrebuiltModulePath) {
1635 // We can't rebuild the module without a module map. Since ReadAST
1636 // already produces diagnostics for these two cases, we simply
1638 ModuleBuildFailed = true;
1639 KnownModules[Path[0].first] = nullptr;
1640 return ModuleLoadResult();
1643 // The module file is missing or out-of-date. Build it.
1644 assert(Module && "missing module file");
1645 // Check whether there is a cycle in the module graph.
1646 ModuleBuildStack ModPath = getSourceManager().getModuleBuildStack();
1647 ModuleBuildStack::iterator Pos = ModPath.begin(), PosEnd = ModPath.end();
1648 for (; Pos != PosEnd; ++Pos) {
1649 if (Pos->first == ModuleName)
1653 if (Pos != PosEnd) {
1654 SmallString<256> CyclePath;
1655 for (; Pos != PosEnd; ++Pos) {
1656 CyclePath += Pos->first;
1657 CyclePath += " -> ";
1659 CyclePath += ModuleName;
1661 getDiagnostics().Report(ModuleNameLoc, diag::err_module_cycle)
1662 << ModuleName << CyclePath;
1663 return ModuleLoadResult();
1666 // Check whether we have already attempted to build this module (but
1668 if (getPreprocessorOpts().FailedModules &&
1669 getPreprocessorOpts().FailedModules->hasAlreadyFailed(ModuleName)) {
1670 getDiagnostics().Report(ModuleNameLoc, diag::err_module_not_built)
1672 << SourceRange(ImportLoc, ModuleNameLoc);
1673 ModuleBuildFailed = true;
1674 return ModuleLoadResult();
1677 // Try to compile and then load the module.
1678 if (!compileAndLoadModule(*this, ImportLoc, ModuleNameLoc, Module,
1680 assert(getDiagnostics().hasErrorOccurred() &&
1681 "undiagnosed error in compileAndLoadModule");
1682 if (getPreprocessorOpts().FailedModules)
1683 getPreprocessorOpts().FailedModules->addFailed(ModuleName);
1684 KnownModules[Path[0].first] = nullptr;
1685 ModuleBuildFailed = true;
1686 return ModuleLoadResult();
1689 // Okay, we've rebuilt and now loaded the module.
1693 case ASTReader::ConfigurationMismatch:
1694 if (LoadFromPrebuiltModulePath)
1695 getDiagnostics().Report(SourceLocation(),
1696 diag::warn_module_config_mismatch)
1698 // Fall through to error out.
1699 case ASTReader::VersionMismatch:
1700 case ASTReader::HadErrors:
1701 ModuleLoader::HadFatalFailure = true;
1702 // FIXME: The ASTReader will already have complained, but can we shoehorn
1703 // that diagnostic information into a more useful form?
1704 KnownModules[Path[0].first] = nullptr;
1705 return ModuleLoadResult();
1707 case ASTReader::Failure:
1708 ModuleLoader::HadFatalFailure = true;
1709 // Already complained, but note now that we failed.
1710 KnownModules[Path[0].first] = nullptr;
1711 ModuleBuildFailed = true;
1712 return ModuleLoadResult();
1715 // Cache the result of this top-level module lookup for later.
1716 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first;
1719 // If we never found the module, fail.
1721 return ModuleLoadResult();
1723 // Verify that the rest of the module path actually corresponds to
1725 if (Path.size() > 1) {
1726 for (unsigned I = 1, N = Path.size(); I != N; ++I) {
1727 StringRef Name = Path[I].first->getName();
1728 clang::Module *Sub = Module->findSubmodule(Name);
1731 // Attempt to perform typo correction to find a module name that works.
1732 SmallVector<StringRef, 2> Best;
1733 unsigned BestEditDistance = (std::numeric_limits<unsigned>::max)();
1735 for (clang::Module::submodule_iterator J = Module->submodule_begin(),
1736 JEnd = Module->submodule_end();
1738 unsigned ED = Name.edit_distance((*J)->Name,
1739 /*AllowReplacements=*/true,
1741 if (ED <= BestEditDistance) {
1742 if (ED < BestEditDistance) {
1744 BestEditDistance = ED;
1747 Best.push_back((*J)->Name);
1751 // If there was a clear winner, user it.
1752 if (Best.size() == 1) {
1753 getDiagnostics().Report(Path[I].second,
1754 diag::err_no_submodule_suggest)
1755 << Path[I].first << Module->getFullModuleName() << Best[0]
1756 << SourceRange(Path[0].second, Path[I-1].second)
1757 << FixItHint::CreateReplacement(SourceRange(Path[I].second),
1760 Sub = Module->findSubmodule(Best[0]);
1765 // No submodule by this name. Complain, and don't look for further
1767 getDiagnostics().Report(Path[I].second, diag::err_no_submodule)
1768 << Path[I].first << Module->getFullModuleName()
1769 << SourceRange(Path[0].second, Path[I-1].second);
1777 // Make the named module visible, if it's not already part of the module
1779 if (ModuleName != getLangOpts().CurrentModule) {
1780 if (!Module->IsFromModuleFile) {
1781 // We have an umbrella header or directory that doesn't actually include
1782 // all of the headers within the directory it covers. Complain about
1783 // this missing submodule and recover by forgetting that we ever saw
1785 // FIXME: Should we detect this at module load time? It seems fairly
1786 // expensive (and rare).
1787 getDiagnostics().Report(ImportLoc, diag::warn_missing_submodule)
1788 << Module->getFullModuleName()
1789 << SourceRange(Path.front().second, Path.back().second);
1791 return ModuleLoadResult::MissingExpected;
1794 // Check whether this module is available.
1795 clang::Module::Requirement Requirement;
1796 clang::Module::UnresolvedHeaderDirective MissingHeader;
1797 if (!Module->isAvailable(getLangOpts(), getTarget(), Requirement,
1799 if (MissingHeader.FileNameLoc.isValid()) {
1800 getDiagnostics().Report(MissingHeader.FileNameLoc,
1801 diag::err_module_header_missing)
1802 << MissingHeader.IsUmbrella << MissingHeader.FileName;
1804 getDiagnostics().Report(ImportLoc, diag::err_module_unavailable)
1805 << Module->getFullModuleName()
1806 << Requirement.second << Requirement.first
1807 << SourceRange(Path.front().second, Path.back().second);
1809 LastModuleImportLoc = ImportLoc;
1810 LastModuleImportResult = ModuleLoadResult();
1811 return ModuleLoadResult();
1814 ModuleManager->makeModuleVisible(Module, Visibility, ImportLoc);
1817 // Check for any configuration macros that have changed.
1818 clang::Module *TopModule = Module->getTopLevelModule();
1819 for (unsigned I = 0, N = TopModule->ConfigMacros.size(); I != N; ++I) {
1820 checkConfigMacro(getPreprocessor(), TopModule->ConfigMacros[I],
1824 LastModuleImportLoc = ImportLoc;
1825 LastModuleImportResult = ModuleLoadResult(Module);
1826 return LastModuleImportResult;
1829 void CompilerInstance::makeModuleVisible(Module *Mod,
1830 Module::NameVisibilityKind Visibility,
1831 SourceLocation ImportLoc) {
1833 createModuleManager();
1837 ModuleManager->makeModuleVisible(Mod, Visibility, ImportLoc);
1840 GlobalModuleIndex *CompilerInstance::loadGlobalModuleIndex(
1841 SourceLocation TriggerLoc) {
1842 if (getPreprocessor().getHeaderSearchInfo().getModuleCachePath().empty())
1845 createModuleManager();
1846 // Can't do anything if we don't have the module manager.
1849 // Get an existing global index. This loads it if not already
1851 ModuleManager->loadGlobalIndex();
1852 GlobalModuleIndex *GlobalIndex = ModuleManager->getGlobalIndex();
1853 // If the global index doesn't exist, create it.
1854 if (!GlobalIndex && shouldBuildGlobalModuleIndex() && hasFileManager() &&
1855 hasPreprocessor()) {
1856 llvm::sys::fs::create_directories(
1857 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1858 GlobalModuleIndex::writeIndex(
1859 getFileManager(), getPCHContainerReader(),
1860 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1861 ModuleManager->resetForReload();
1862 ModuleManager->loadGlobalIndex();
1863 GlobalIndex = ModuleManager->getGlobalIndex();
1865 // For finding modules needing to be imported for fixit messages,
1866 // we need to make the global index cover all modules, so we do that here.
1867 if (!HaveFullGlobalModuleIndex && GlobalIndex && !buildingModule()) {
1868 ModuleMap &MMap = getPreprocessor().getHeaderSearchInfo().getModuleMap();
1869 bool RecreateIndex = false;
1870 for (ModuleMap::module_iterator I = MMap.module_begin(),
1871 E = MMap.module_end(); I != E; ++I) {
1872 Module *TheModule = I->second;
1873 const FileEntry *Entry = TheModule->getASTFile();
1875 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
1876 Path.push_back(std::make_pair(
1877 getPreprocessor().getIdentifierInfo(TheModule->Name), TriggerLoc));
1878 std::reverse(Path.begin(), Path.end());
1879 // Load a module as hidden. This also adds it to the global index.
1880 loadModule(TheModule->DefinitionLoc, Path, Module::Hidden, false);
1881 RecreateIndex = true;
1884 if (RecreateIndex) {
1885 GlobalModuleIndex::writeIndex(
1886 getFileManager(), getPCHContainerReader(),
1887 getPreprocessor().getHeaderSearchInfo().getModuleCachePath());
1888 ModuleManager->resetForReload();
1889 ModuleManager->loadGlobalIndex();
1890 GlobalIndex = ModuleManager->getGlobalIndex();
1892 HaveFullGlobalModuleIndex = true;
1897 // Check global module index for missing imports.
1899 CompilerInstance::lookupMissingImports(StringRef Name,
1900 SourceLocation TriggerLoc) {
1901 // Look for the symbol in non-imported modules, but only if an error
1902 // actually occurred.
1903 if (!buildingModule()) {
1904 // Load global module index, or retrieve a previously loaded one.
1905 GlobalModuleIndex *GlobalIndex = loadGlobalModuleIndex(
1908 // Only if we have a global index.
1910 GlobalModuleIndex::HitSet FoundModules;
1912 // Find the modules that reference the identifier.
1913 // Note that this only finds top-level modules.
1914 // We'll let diagnoseTypo find the actual declaration module.
1915 if (GlobalIndex->lookupIdentifier(Name, FoundModules))
1922 void CompilerInstance::resetAndLeakSema() { BuryPointer(takeSema()); }
1924 void CompilerInstance::setExternalSemaSource(
1925 IntrusiveRefCntPtr<ExternalSemaSource> ESS) {
1926 ExternalSemaSrc = std::move(ESS);