CompilerInstance.cpp revision 392ed2b717d86ebdd202cb9bb58d18d8b3b4cd87
1//===--- CompilerInstance.cpp ---------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10#include "clang/Frontend/CompilerInstance.h" 11#include "clang/Sema/Sema.h" 12#include "clang/AST/ASTConsumer.h" 13#include "clang/AST/ASTContext.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/Lex/HeaderSearch.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/PTHManager.h" 22#include "clang/Frontend/ChainedDiagnosticConsumer.h" 23#include "clang/Frontend/FrontendAction.h" 24#include "clang/Frontend/FrontendActions.h" 25#include "clang/Frontend/FrontendDiagnostic.h" 26#include "clang/Frontend/LogDiagnosticPrinter.h" 27#include "clang/Frontend/SerializedDiagnosticPrinter.h" 28#include "clang/Frontend/TextDiagnosticPrinter.h" 29#include "clang/Frontend/VerifyDiagnosticConsumer.h" 30#include "clang/Frontend/Utils.h" 31#include "clang/Serialization/ASTReader.h" 32#include "clang/Sema/CodeCompleteConsumer.h" 33#include "llvm/Support/FileSystem.h" 34#include "llvm/Support/MemoryBuffer.h" 35#include "llvm/Support/raw_ostream.h" 36#include "llvm/ADT/Statistic.h" 37#include "llvm/Support/Timer.h" 38#include "llvm/Support/Host.h" 39#include "llvm/Support/Path.h" 40#include "llvm/Support/Program.h" 41#include "llvm/Support/Signals.h" 42#include "llvm/Support/system_error.h" 43#include "llvm/Support/CrashRecoveryContext.h" 44#include "llvm/Config/config.h" 45 46// Support for FileLockManager 47#include <fstream> 48#include <sys/types.h> 49#include <sys/stat.h> 50 51#if LLVM_ON_WIN32 52#include <windows.h> 53#endif 54#if LLVM_ON_UNIX 55#include <unistd.h> 56#endif 57 58using namespace clang; 59 60CompilerInstance::CompilerInstance() 61 : Invocation(new CompilerInvocation()), ModuleManager(0) { 62} 63 64CompilerInstance::~CompilerInstance() { 65} 66 67void CompilerInstance::setInvocation(CompilerInvocation *Value) { 68 Invocation = Value; 69} 70 71void CompilerInstance::setDiagnostics(DiagnosticsEngine *Value) { 72 Diagnostics = Value; 73} 74 75void CompilerInstance::setTarget(TargetInfo *Value) { 76 Target = Value; 77} 78 79void CompilerInstance::setFileManager(FileManager *Value) { 80 FileMgr = Value; 81} 82 83void CompilerInstance::setSourceManager(SourceManager *Value) { 84 SourceMgr = Value; 85} 86 87void CompilerInstance::setPreprocessor(Preprocessor *Value) { PP = Value; } 88 89void CompilerInstance::setASTContext(ASTContext *Value) { Context = Value; } 90 91void CompilerInstance::setSema(Sema *S) { 92 TheSema.reset(S); 93} 94 95void CompilerInstance::setASTConsumer(ASTConsumer *Value) { 96 Consumer.reset(Value); 97} 98 99void CompilerInstance::setCodeCompletionConsumer(CodeCompleteConsumer *Value) { 100 CompletionConsumer.reset(Value); 101} 102 103// Diagnostics 104static void SetUpBuildDumpLog(const DiagnosticOptions &DiagOpts, 105 unsigned argc, const char* const *argv, 106 DiagnosticsEngine &Diags) { 107 std::string ErrorInfo; 108 llvm::OwningPtr<raw_ostream> OS( 109 new llvm::raw_fd_ostream(DiagOpts.DumpBuildInformation.c_str(), ErrorInfo)); 110 if (!ErrorInfo.empty()) { 111 Diags.Report(diag::err_fe_unable_to_open_logfile) 112 << DiagOpts.DumpBuildInformation << ErrorInfo; 113 return; 114 } 115 116 (*OS) << "clang -cc1 command line arguments: "; 117 for (unsigned i = 0; i != argc; ++i) 118 (*OS) << argv[i] << ' '; 119 (*OS) << '\n'; 120 121 // Chain in a diagnostic client which will log the diagnostics. 122 DiagnosticConsumer *Logger = 123 new TextDiagnosticPrinter(*OS.take(), DiagOpts, /*OwnsOutputStream=*/true); 124 Diags.setClient(new ChainedDiagnosticConsumer(Diags.takeClient(), Logger)); 125} 126 127static void SetUpDiagnosticLog(const DiagnosticOptions &DiagOpts, 128 const CodeGenOptions *CodeGenOpts, 129 DiagnosticsEngine &Diags) { 130 std::string ErrorInfo; 131 bool OwnsStream = false; 132 raw_ostream *OS = &llvm::errs(); 133 if (DiagOpts.DiagnosticLogFile != "-") { 134 // Create the output stream. 135 llvm::raw_fd_ostream *FileOS( 136 new llvm::raw_fd_ostream(DiagOpts.DiagnosticLogFile.c_str(), 137 ErrorInfo, llvm::raw_fd_ostream::F_Append)); 138 if (!ErrorInfo.empty()) { 139 Diags.Report(diag::warn_fe_cc_log_diagnostics_failure) 140 << DiagOpts.DumpBuildInformation << ErrorInfo; 141 } else { 142 FileOS->SetUnbuffered(); 143 FileOS->SetUseAtomicWrites(true); 144 OS = FileOS; 145 OwnsStream = true; 146 } 147 } 148 149 // Chain in the diagnostic client which will log the diagnostics. 150 LogDiagnosticPrinter *Logger = new LogDiagnosticPrinter(*OS, DiagOpts, 151 OwnsStream); 152 if (CodeGenOpts) 153 Logger->setDwarfDebugFlags(CodeGenOpts->DwarfDebugFlags); 154 Diags.setClient(new ChainedDiagnosticConsumer(Diags.takeClient(), Logger)); 155} 156 157static void SetupSerializedDiagnostics(const DiagnosticOptions &DiagOpts, 158 DiagnosticsEngine &Diags, 159 StringRef OutputFile) { 160 std::string ErrorInfo; 161 llvm::OwningPtr<llvm::raw_fd_ostream> OS; 162 OS.reset(new llvm::raw_fd_ostream(OutputFile.str().c_str(), ErrorInfo, 163 llvm::raw_fd_ostream::F_Binary)); 164 165 if (!ErrorInfo.empty()) { 166 Diags.Report(diag::warn_fe_serialized_diag_failure) 167 << OutputFile << ErrorInfo; 168 return; 169 } 170 171 DiagnosticConsumer *SerializedConsumer = 172 clang::serialized_diags::create(OS.take(), Diags); 173 174 175 Diags.setClient(new ChainedDiagnosticConsumer(Diags.takeClient(), 176 SerializedConsumer)); 177} 178 179void CompilerInstance::createDiagnostics(int Argc, const char* const *Argv, 180 DiagnosticConsumer *Client, 181 bool ShouldOwnClient, 182 bool ShouldCloneClient) { 183 Diagnostics = createDiagnostics(getDiagnosticOpts(), Argc, Argv, Client, 184 ShouldOwnClient, ShouldCloneClient, 185 &getCodeGenOpts()); 186} 187 188llvm::IntrusiveRefCntPtr<DiagnosticsEngine> 189CompilerInstance::createDiagnostics(const DiagnosticOptions &Opts, 190 int Argc, const char* const *Argv, 191 DiagnosticConsumer *Client, 192 bool ShouldOwnClient, 193 bool ShouldCloneClient, 194 const CodeGenOptions *CodeGenOpts) { 195 llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs()); 196 llvm::IntrusiveRefCntPtr<DiagnosticsEngine> 197 Diags(new DiagnosticsEngine(DiagID)); 198 199 // Create the diagnostic client for reporting errors or for 200 // implementing -verify. 201 if (Client) { 202 if (ShouldCloneClient) 203 Diags->setClient(Client->clone(*Diags), ShouldOwnClient); 204 else 205 Diags->setClient(Client, ShouldOwnClient); 206 } else 207 Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), Opts)); 208 209 // Chain in -verify checker, if requested. 210 if (Opts.VerifyDiagnostics) 211 Diags->setClient(new VerifyDiagnosticConsumer(*Diags)); 212 213 // Chain in -diagnostic-log-file dumper, if requested. 214 if (!Opts.DiagnosticLogFile.empty()) 215 SetUpDiagnosticLog(Opts, CodeGenOpts, *Diags); 216 217 if (!Opts.DumpBuildInformation.empty()) 218 SetUpBuildDumpLog(Opts, Argc, Argv, *Diags); 219 220 if (!Opts.DiagnosticSerializationFile.empty()) 221 SetupSerializedDiagnostics(Opts, *Diags, 222 Opts.DiagnosticSerializationFile); 223 224 // Configure our handling of diagnostics. 225 ProcessWarningOptions(*Diags, Opts); 226 227 return Diags; 228} 229 230// File Manager 231 232void CompilerInstance::createFileManager() { 233 FileMgr = new FileManager(getFileSystemOpts()); 234} 235 236// Source Manager 237 238void CompilerInstance::createSourceManager(FileManager &FileMgr) { 239 SourceMgr = new SourceManager(getDiagnostics(), FileMgr); 240} 241 242// Preprocessor 243 244void CompilerInstance::createPreprocessor() { 245 const PreprocessorOptions &PPOpts = getPreprocessorOpts(); 246 247 // Create a PTH manager if we are using some form of a token cache. 248 PTHManager *PTHMgr = 0; 249 if (!PPOpts.TokenCache.empty()) 250 PTHMgr = PTHManager::Create(PPOpts.TokenCache, getDiagnostics()); 251 252 // Create the Preprocessor. 253 HeaderSearch *HeaderInfo = new HeaderSearch(getFileManager(), 254 getDiagnostics()); 255 PP = new Preprocessor(getDiagnostics(), getLangOpts(), &getTarget(), 256 getSourceManager(), *HeaderInfo, *this, PTHMgr, 257 /*OwnsHeaderSearch=*/true); 258 259 // Note that this is different then passing PTHMgr to Preprocessor's ctor. 260 // That argument is used as the IdentifierInfoLookup argument to 261 // IdentifierTable's ctor. 262 if (PTHMgr) { 263 PTHMgr->setPreprocessor(&*PP); 264 PP->setPTHManager(PTHMgr); 265 } 266 267 if (PPOpts.DetailedRecord) 268 PP->createPreprocessingRecord( 269 PPOpts.DetailedRecordIncludesNestedMacroExpansions); 270 271 InitializePreprocessor(*PP, PPOpts, getHeaderSearchOpts(), getFrontendOpts()); 272 273 // Set up the module path, including the hash for the 274 // module-creation options. 275 llvm::SmallString<256> SpecificModuleCache( 276 getHeaderSearchOpts().ModuleCachePath); 277 if (!getHeaderSearchOpts().DisableModuleHash) 278 llvm::sys::path::append(SpecificModuleCache, 279 getInvocation().getModuleHash()); 280 PP->getHeaderSearchInfo().configureModules(SpecificModuleCache, 281 getLangOpts().CurrentModule); 282 283 // Handle generating dependencies, if requested. 284 const DependencyOutputOptions &DepOpts = getDependencyOutputOpts(); 285 if (!DepOpts.OutputFile.empty()) 286 AttachDependencyFileGen(*PP, DepOpts); 287 288 // Handle generating header include information, if requested. 289 if (DepOpts.ShowHeaderIncludes) 290 AttachHeaderIncludeGen(*PP); 291 if (!DepOpts.HeaderIncludeOutputFile.empty()) { 292 StringRef OutputPath = DepOpts.HeaderIncludeOutputFile; 293 if (OutputPath == "-") 294 OutputPath = ""; 295 AttachHeaderIncludeGen(*PP, /*ShowAllHeaders=*/true, OutputPath, 296 /*ShowDepth=*/false); 297 } 298} 299 300// ASTContext 301 302void CompilerInstance::createASTContext() { 303 Preprocessor &PP = getPreprocessor(); 304 Context = new ASTContext(getLangOpts(), PP.getSourceManager(), 305 &getTarget(), PP.getIdentifierTable(), 306 PP.getSelectorTable(), PP.getBuiltinInfo(), 307 /*size_reserve=*/ 0); 308} 309 310// ExternalASTSource 311 312void CompilerInstance::createPCHExternalASTSource(StringRef Path, 313 bool DisablePCHValidation, 314 bool DisableStatCache, 315 void *DeserializationListener){ 316 llvm::OwningPtr<ExternalASTSource> Source; 317 bool Preamble = getPreprocessorOpts().PrecompiledPreambleBytes.first != 0; 318 Source.reset(createPCHExternalASTSource(Path, getHeaderSearchOpts().Sysroot, 319 DisablePCHValidation, 320 DisableStatCache, 321 getPreprocessor(), getASTContext(), 322 DeserializationListener, 323 Preamble)); 324 ModuleManager = static_cast<ASTReader*>(Source.get()); 325 getASTContext().setExternalSource(Source); 326} 327 328ExternalASTSource * 329CompilerInstance::createPCHExternalASTSource(StringRef Path, 330 const std::string &Sysroot, 331 bool DisablePCHValidation, 332 bool DisableStatCache, 333 Preprocessor &PP, 334 ASTContext &Context, 335 void *DeserializationListener, 336 bool Preamble) { 337 llvm::OwningPtr<ASTReader> Reader; 338 Reader.reset(new ASTReader(PP, Context, 339 Sysroot.empty() ? "" : Sysroot.c_str(), 340 DisablePCHValidation, DisableStatCache)); 341 342 Reader->setDeserializationListener( 343 static_cast<ASTDeserializationListener *>(DeserializationListener)); 344 switch (Reader->ReadAST(Path, 345 Preamble ? serialization::MK_Preamble 346 : serialization::MK_PCH)) { 347 case ASTReader::Success: 348 // Set the predefines buffer as suggested by the PCH reader. Typically, the 349 // predefines buffer will be empty. 350 PP.setPredefines(Reader->getSuggestedPredefines()); 351 return Reader.take(); 352 353 case ASTReader::Failure: 354 // Unrecoverable failure: don't even try to process the input file. 355 break; 356 357 case ASTReader::IgnorePCH: 358 // No suitable PCH file could be found. Return an error. 359 break; 360 } 361 362 return 0; 363} 364 365// Code Completion 366 367static bool EnableCodeCompletion(Preprocessor &PP, 368 const std::string &Filename, 369 unsigned Line, 370 unsigned Column) { 371 // Tell the source manager to chop off the given file at a specific 372 // line and column. 373 const FileEntry *Entry = PP.getFileManager().getFile(Filename); 374 if (!Entry) { 375 PP.getDiagnostics().Report(diag::err_fe_invalid_code_complete_file) 376 << Filename; 377 return true; 378 } 379 380 // Truncate the named file at the given line/column. 381 PP.SetCodeCompletionPoint(Entry, Line, Column); 382 return false; 383} 384 385void CompilerInstance::createCodeCompletionConsumer() { 386 const ParsedSourceLocation &Loc = getFrontendOpts().CodeCompletionAt; 387 if (!CompletionConsumer) { 388 CompletionConsumer.reset( 389 createCodeCompletionConsumer(getPreprocessor(), 390 Loc.FileName, Loc.Line, Loc.Column, 391 getFrontendOpts().ShowMacrosInCodeCompletion, 392 getFrontendOpts().ShowCodePatternsInCodeCompletion, 393 getFrontendOpts().ShowGlobalSymbolsInCodeCompletion, 394 llvm::outs())); 395 if (!CompletionConsumer) 396 return; 397 } else if (EnableCodeCompletion(getPreprocessor(), Loc.FileName, 398 Loc.Line, Loc.Column)) { 399 CompletionConsumer.reset(); 400 return; 401 } 402 403 if (CompletionConsumer->isOutputBinary() && 404 llvm::sys::Program::ChangeStdoutToBinary()) { 405 getPreprocessor().getDiagnostics().Report(diag::err_fe_stdout_binary); 406 CompletionConsumer.reset(); 407 } 408} 409 410void CompilerInstance::createFrontendTimer() { 411 FrontendTimer.reset(new llvm::Timer("Clang front-end timer")); 412} 413 414CodeCompleteConsumer * 415CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP, 416 const std::string &Filename, 417 unsigned Line, 418 unsigned Column, 419 bool ShowMacros, 420 bool ShowCodePatterns, 421 bool ShowGlobals, 422 raw_ostream &OS) { 423 if (EnableCodeCompletion(PP, Filename, Line, Column)) 424 return 0; 425 426 // Set up the creation routine for code-completion. 427 return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns, 428 ShowGlobals, OS); 429} 430 431void CompilerInstance::createSema(TranslationUnitKind TUKind, 432 CodeCompleteConsumer *CompletionConsumer) { 433 TheSema.reset(new Sema(getPreprocessor(), getASTContext(), getASTConsumer(), 434 TUKind, CompletionConsumer)); 435} 436 437// Output Files 438 439void CompilerInstance::addOutputFile(const OutputFile &OutFile) { 440 assert(OutFile.OS && "Attempt to add empty stream to output list!"); 441 OutputFiles.push_back(OutFile); 442} 443 444void CompilerInstance::clearOutputFiles(bool EraseFiles) { 445 for (std::list<OutputFile>::iterator 446 it = OutputFiles.begin(), ie = OutputFiles.end(); it != ie; ++it) { 447 delete it->OS; 448 if (!it->TempFilename.empty()) { 449 if (EraseFiles) { 450 bool existed; 451 llvm::sys::fs::remove(it->TempFilename, existed); 452 } else { 453 llvm::SmallString<128> NewOutFile(it->Filename); 454 455 // If '-working-directory' was passed, the output filename should be 456 // relative to that. 457 FileMgr->FixupRelativePath(NewOutFile); 458 if (llvm::error_code ec = llvm::sys::fs::rename(it->TempFilename, 459 NewOutFile.str())) { 460 getDiagnostics().Report(diag::err_fe_unable_to_rename_temp) 461 << it->TempFilename << it->Filename << ec.message(); 462 463 bool existed; 464 llvm::sys::fs::remove(it->TempFilename, existed); 465 } 466 } 467 } else if (!it->Filename.empty() && EraseFiles) 468 llvm::sys::Path(it->Filename).eraseFromDisk(); 469 470 } 471 OutputFiles.clear(); 472} 473 474llvm::raw_fd_ostream * 475CompilerInstance::createDefaultOutputFile(bool Binary, 476 StringRef InFile, 477 StringRef Extension) { 478 return createOutputFile(getFrontendOpts().OutputFile, Binary, 479 /*RemoveFileOnSignal=*/true, InFile, Extension); 480} 481 482llvm::raw_fd_ostream * 483CompilerInstance::createOutputFile(StringRef OutputPath, 484 bool Binary, bool RemoveFileOnSignal, 485 StringRef InFile, 486 StringRef Extension, 487 bool UseTemporary) { 488 std::string Error, OutputPathName, TempPathName; 489 llvm::raw_fd_ostream *OS = createOutputFile(OutputPath, Error, Binary, 490 RemoveFileOnSignal, 491 InFile, Extension, 492 UseTemporary, 493 &OutputPathName, 494 &TempPathName); 495 if (!OS) { 496 getDiagnostics().Report(diag::err_fe_unable_to_open_output) 497 << OutputPath << Error; 498 return 0; 499 } 500 501 // Add the output file -- but don't try to remove "-", since this means we are 502 // using stdin. 503 addOutputFile(OutputFile((OutputPathName != "-") ? OutputPathName : "", 504 TempPathName, OS)); 505 506 return OS; 507} 508 509llvm::raw_fd_ostream * 510CompilerInstance::createOutputFile(StringRef OutputPath, 511 std::string &Error, 512 bool Binary, 513 bool RemoveFileOnSignal, 514 StringRef InFile, 515 StringRef Extension, 516 bool UseTemporary, 517 std::string *ResultPathName, 518 std::string *TempPathName) { 519 std::string OutFile, TempFile; 520 if (!OutputPath.empty()) { 521 OutFile = OutputPath; 522 } else if (InFile == "-") { 523 OutFile = "-"; 524 } else if (!Extension.empty()) { 525 llvm::sys::Path Path(InFile); 526 Path.eraseSuffix(); 527 Path.appendSuffix(Extension); 528 OutFile = Path.str(); 529 } else { 530 OutFile = "-"; 531 } 532 533 llvm::OwningPtr<llvm::raw_fd_ostream> OS; 534 std::string OSFile; 535 536 if (UseTemporary && OutFile != "-") { 537 llvm::sys::Path OutPath(OutFile); 538 // Only create the temporary if we can actually write to OutPath, otherwise 539 // we want to fail early. 540 bool Exists; 541 if ((llvm::sys::fs::exists(OutPath.str(), Exists) || !Exists) || 542 (OutPath.isRegularFile() && OutPath.canWrite())) { 543 // Create a temporary file. 544 llvm::SmallString<128> TempPath; 545 TempPath = OutFile; 546 TempPath += "-%%%%%%%%"; 547 int fd; 548 if (llvm::sys::fs::unique_file(TempPath.str(), fd, TempPath, 549 /*makeAbsolute=*/false) == llvm::errc::success) { 550 OS.reset(new llvm::raw_fd_ostream(fd, /*shouldClose=*/true)); 551 OSFile = TempFile = TempPath.str(); 552 } 553 } 554 } 555 556 if (!OS) { 557 OSFile = OutFile; 558 OS.reset( 559 new llvm::raw_fd_ostream(OSFile.c_str(), Error, 560 (Binary ? llvm::raw_fd_ostream::F_Binary : 0))); 561 if (!Error.empty()) 562 return 0; 563 } 564 565 // Make sure the out stream file gets removed if we crash. 566 if (RemoveFileOnSignal) 567 llvm::sys::RemoveFileOnSignal(llvm::sys::Path(OSFile)); 568 569 if (ResultPathName) 570 *ResultPathName = OutFile; 571 if (TempPathName) 572 *TempPathName = TempFile; 573 574 return OS.take(); 575} 576 577// Initialization Utilities 578 579bool CompilerInstance::InitializeSourceManager(StringRef InputFile) { 580 return InitializeSourceManager(InputFile, getDiagnostics(), getFileManager(), 581 getSourceManager(), getFrontendOpts()); 582} 583 584bool CompilerInstance::InitializeSourceManager(StringRef InputFile, 585 DiagnosticsEngine &Diags, 586 FileManager &FileMgr, 587 SourceManager &SourceMgr, 588 const FrontendOptions &Opts) { 589 // Figure out where to get and map in the main file. 590 if (InputFile != "-") { 591 const FileEntry *File = FileMgr.getFile(InputFile); 592 if (!File) { 593 Diags.Report(diag::err_fe_error_reading) << InputFile; 594 return false; 595 } 596 SourceMgr.createMainFileID(File); 597 } else { 598 llvm::OwningPtr<llvm::MemoryBuffer> SB; 599 if (llvm::MemoryBuffer::getSTDIN(SB)) { 600 // FIXME: Give ec.message() in this diag. 601 Diags.Report(diag::err_fe_error_reading_stdin); 602 return false; 603 } 604 const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(), 605 SB->getBufferSize(), 0); 606 SourceMgr.createMainFileID(File); 607 SourceMgr.overrideFileContents(File, SB.take()); 608 } 609 610 assert(!SourceMgr.getMainFileID().isInvalid() && 611 "Couldn't establish MainFileID!"); 612 return true; 613} 614 615// High-Level Operations 616 617bool CompilerInstance::ExecuteAction(FrontendAction &Act) { 618 assert(hasDiagnostics() && "Diagnostics engine is not initialized!"); 619 assert(!getFrontendOpts().ShowHelp && "Client must handle '-help'!"); 620 assert(!getFrontendOpts().ShowVersion && "Client must handle '-version'!"); 621 622 // FIXME: Take this as an argument, once all the APIs we used have moved to 623 // taking it as an input instead of hard-coding llvm::errs. 624 raw_ostream &OS = llvm::errs(); 625 626 // Create the target instance. 627 setTarget(TargetInfo::CreateTargetInfo(getDiagnostics(), getTargetOpts())); 628 if (!hasTarget()) 629 return false; 630 631 // Inform the target of the language options. 632 // 633 // FIXME: We shouldn't need to do this, the target should be immutable once 634 // created. This complexity should be lifted elsewhere. 635 getTarget().setForcedLangOptions(getLangOpts()); 636 637 // Validate/process some options. 638 if (getHeaderSearchOpts().Verbose) 639 OS << "clang -cc1 version " CLANG_VERSION_STRING 640 << " based upon " << PACKAGE_STRING 641 << " default target " << llvm::sys::getDefaultTargetTriple() << "\n"; 642 643 if (getFrontendOpts().ShowTimers) 644 createFrontendTimer(); 645 646 if (getFrontendOpts().ShowStats) 647 llvm::EnableStatistics(); 648 649 for (unsigned i = 0, e = getFrontendOpts().Inputs.size(); i != e; ++i) { 650 const std::string &InFile = getFrontendOpts().Inputs[i].second; 651 652 // Reset the ID tables if we are reusing the SourceManager. 653 if (hasSourceManager()) 654 getSourceManager().clearIDTables(); 655 656 if (Act.BeginSourceFile(*this, InFile, getFrontendOpts().Inputs[i].first)) { 657 Act.Execute(); 658 Act.EndSourceFile(); 659 } 660 } 661 662 if (getDiagnosticOpts().ShowCarets) { 663 // We can have multiple diagnostics sharing one diagnostic client. 664 // Get the total number of warnings/errors from the client. 665 unsigned NumWarnings = getDiagnostics().getClient()->getNumWarnings(); 666 unsigned NumErrors = getDiagnostics().getClient()->getNumErrors(); 667 668 if (NumWarnings) 669 OS << NumWarnings << " warning" << (NumWarnings == 1 ? "" : "s"); 670 if (NumWarnings && NumErrors) 671 OS << " and "; 672 if (NumErrors) 673 OS << NumErrors << " error" << (NumErrors == 1 ? "" : "s"); 674 if (NumWarnings || NumErrors) 675 OS << " generated.\n"; 676 } 677 678 if (getFrontendOpts().ShowStats && hasFileManager()) { 679 getFileManager().PrintStats(); 680 OS << "\n"; 681 } 682 683 return !getDiagnostics().getClient()->getNumErrors(); 684} 685 686/// \brief Determine the appropriate source input kind based on language 687/// options. 688static InputKind getSourceInputKindFromOptions(const LangOptions &LangOpts) { 689 if (LangOpts.OpenCL) 690 return IK_OpenCL; 691 if (LangOpts.CUDA) 692 return IK_CUDA; 693 if (LangOpts.ObjC1) 694 return LangOpts.CPlusPlus? IK_ObjCXX : IK_ObjC; 695 return LangOpts.CPlusPlus? IK_CXX : IK_C; 696} 697 698namespace { 699 struct CompileModuleMapData { 700 CompilerInstance &Instance; 701 GenerateModuleAction &CreateModuleAction; 702 }; 703} 704 705/// \brief Helper function that executes the module-generating action under 706/// a crash recovery context. 707static void doCompileMapModule(void *UserData) { 708 CompileModuleMapData &Data 709 = *reinterpret_cast<CompileModuleMapData *>(UserData); 710 Data.Instance.ExecuteAction(Data.CreateModuleAction); 711} 712 713namespace { 714 /// \brief Class that manages the creation of a lock file to aid 715 /// implicit coordination between different processes. 716 /// 717 /// The implicit coordination works by creating a ".lock" file alongside 718 /// the file that we're coordinating for, using the atomicity of the file 719 /// system to ensure that only a single process can create that ".lock" file. 720 /// When the lock file is removed, the owning process has finished the 721 /// operation. 722 class LockFileManager { 723 public: 724 /// \brief Describes the state of a lock file. 725 enum LockFileState { 726 /// \brief The lock file has been created and is owned by this instance 727 /// of the object. 728 LFS_Owned, 729 /// \brief The lock file already exists and is owned by some other 730 /// instance. 731 LFS_Shared, 732 /// \brief An error occurred while trying to create or find the lock 733 /// file. 734 LFS_Error 735 }; 736 737 private: 738 llvm::SmallString<128> LockFileName; 739 llvm::SmallString<128> UniqueLockFileName; 740 741 llvm::Optional<std::pair<std::string, int> > Owner; 742 llvm::Optional<llvm::error_code> Error; 743 744 LockFileManager(const LockFileManager &); 745 LockFileManager &operator=(const LockFileManager &); 746 747 static llvm::Optional<std::pair<std::string, int> > 748 readLockFile(StringRef LockFileName); 749 750 static bool processStillExecuting(StringRef Hostname, int PID); 751 752 public: 753 754 LockFileManager(StringRef FileName); 755 ~LockFileManager(); 756 757 /// \brief Determine the state of the lock file. 758 LockFileState getState() const; 759 760 operator LockFileState() const { return getState(); } 761 762 /// \brief For a shared lock, wait until the owner releases the lock. 763 void waitForUnlock(); 764 }; 765} 766 767/// \brief Attempt to read the lock file with the given name, if it exists. 768/// 769/// \param LockFileName The name of the lock file to read. 770/// 771/// \returns The process ID of the process that owns this lock file 772llvm::Optional<std::pair<std::string, int> > 773LockFileManager::readLockFile(StringRef LockFileName) { 774 // Check whether the lock file exists. If not, clearly there's nothing 775 // to read, so we just return. 776 bool Exists = false; 777 if (llvm::sys::fs::exists(LockFileName, Exists) || !Exists) 778 return llvm::Optional<std::pair<std::string, int> >(); 779 780 // Read the owning host and PID out of the lock file. If it appears that the 781 // owning process is dead, the lock file is invalid. 782 int PID = 0; 783 std::string Hostname; 784 std::ifstream Input(LockFileName.str().c_str()); 785 if (Input >> Hostname >> PID && PID > 0 && 786 processStillExecuting(Hostname, PID)) 787 return std::make_pair(Hostname, PID); 788 789 // Delete the lock file. It's invalid anyway. 790 bool Existed; 791 llvm::sys::fs::remove(LockFileName, Existed); 792 return llvm::Optional<std::pair<std::string, int> >(); 793} 794 795bool LockFileManager::processStillExecuting(StringRef Hostname, int PID) { 796#if LLVM_ON_UNIX 797 char MyHostname[256]; 798 MyHostname[255] = 0; 799 MyHostname[0] = 0; 800 gethostname(MyHostname, 255); 801 // Check whether the process is dead. If so, we're done. 802 if (MyHostname == Hostname && getsid(PID) == -1 && errno == ESRCH) 803 return false; 804#endif 805 806 return true; 807} 808 809LockFileManager::LockFileManager(StringRef FileName) 810{ 811 LockFileName = FileName; 812 LockFileName += ".lock"; 813 814 // If the lock file already exists, don't bother to try to create our own 815 // lock file; it won't work anyway. Just figure out who owns this lock file. 816 if ((Owner = readLockFile(LockFileName))) 817 return; 818 819 // Create a lock file that is unique to this instance. 820 UniqueLockFileName = LockFileName; 821 UniqueLockFileName += "-%%%%%%%%"; 822 int UniqueLockFileID; 823 if (llvm::error_code EC 824 = llvm::sys::fs::unique_file(UniqueLockFileName.str(), 825 UniqueLockFileID, 826 UniqueLockFileName, 827 /*makeAbsolute=*/false)) { 828 Error = EC; 829 return; 830 } 831 832 // Write our process ID to our unique lock file. 833 { 834 llvm::raw_fd_ostream Out(UniqueLockFileID, /*shouldClose=*/true); 835 836#if LLVM_ON_UNIX 837 // FIXME: move getpid() call into LLVM 838 char hostname[256]; 839 hostname[255] = 0; 840 hostname[0] = 0; 841 gethostname(hostname, 255); 842 Out << hostname << ' ' << getpid(); 843#else 844 Out << "localhost 1"; 845#endif 846 Out.close(); 847 848 if (Out.has_error()) { 849 // We failed to write out PID, so make up an excuse, remove the 850 // unique lock file, and fail. 851 Error = llvm::make_error_code(llvm::errc::no_space_on_device); 852 bool Existed; 853 llvm::sys::fs::remove(UniqueLockFileName.c_str(), Existed); 854 return; 855 } 856 } 857 858 // Create a hard link from the lock file name. If this succeeds, we're done. 859 llvm::error_code EC 860 = llvm::sys::fs::create_hard_link(UniqueLockFileName.str(), 861 LockFileName.str()); 862 if (EC == llvm::errc::success) 863 return; 864 865 // Creating the hard link failed. 866 867#ifdef LLVM_ON_UNIX 868 // The creation of the hard link may appear to fail, but if stat'ing the 869 // unique file returns a link count of 2, then we can still declare success. 870 struct stat StatBuf; 871 if (stat(UniqueLockFileName.c_str(), &StatBuf) == 0 && 872 StatBuf.st_nlink == 2) 873 return; 874#endif 875 876 // Someone else managed to create the lock file first. Wipe out our unique 877 // lock file (it's useless now) and read the process ID from the lock file. 878 bool Existed; 879 llvm::sys::fs::remove(UniqueLockFileName.str(), Existed); 880 if ((Owner = readLockFile(LockFileName))) 881 return; 882 883 // There is a lock file that nobody owns; try to clean it up and report 884 // an error. 885 llvm::sys::fs::remove(LockFileName.str(), Existed); 886 Error = EC; 887} 888 889LockFileManager::LockFileState LockFileManager::getState() const { 890 if (Owner) 891 return LFS_Shared; 892 893 if (Error) 894 return LFS_Error; 895 896 return LFS_Owned; 897} 898 899LockFileManager::~LockFileManager() { 900 if (getState() != LFS_Owned) 901 return; 902 903 // Since we own the lock, remove the lock file and our own unique lock file. 904 bool Existed; 905 llvm::sys::fs::remove(LockFileName.str(), Existed); 906 llvm::sys::fs::remove(UniqueLockFileName.str(), Existed); 907} 908 909void LockFileManager::waitForUnlock() { 910 if (getState() != LFS_Shared) 911 return; 912 913#if LLVM_ON_WIN32 914 unsigned long Interval = 1; 915#else 916 struct timespec Interval; 917 Interval.tv_sec = 0; 918 Interval.tv_nsec = 1000000; 919#endif 920 // Don't wait more than an hour for the file to appear. 921 const unsigned MaxSeconds = 3600; 922 do { 923 // Sleep for the designated interval, to allow the owning process time to 924 // finish up and 925 // FIXME: Should we hook in to system APIs to get a notification when the 926 // lock file is deleted? 927#if LLVM_ON_WIN32 928 Sleep(Interval); 929#else 930 nanosleep(&Interval, NULL); 931#endif 932 // If the file no longer exists, we're done. 933 bool Exists = false; 934 if (!llvm::sys::fs::exists(LockFileName.str(), Exists) && !Exists) 935 return; 936 937 if (!processStillExecuting((*Owner).first, (*Owner).second)) 938 return; 939 940 // Exponentially increase the time we wait for the lock to be removed. 941#if LLVM_ON_WIN32 942 Interval *= 2; 943#else 944 Interval.tv_sec *= 2; 945 Interval.tv_nsec *= 2; 946 if (Interval.tv_nsec >= 1000000000) { 947 ++Interval.tv_sec; 948 Interval.tv_nsec -= 1000000000; 949 } 950#endif 951 } while ( 952#if LLVM_ON_WIN32 953 Interval < MaxSeconds * 1000 954#else 955 Interval.tv_sec < (time_t)MaxSeconds 956#endif 957 ); 958 959 // Give up. 960} 961 962/// \brief Compile a module file for the given module, using the options 963/// provided by the importing compiler instance. 964static void compileModule(CompilerInstance &ImportingInstance, 965 ModuleMap::Module *Module, 966 StringRef ModuleFileName) { 967 LockFileManager Locked(ModuleFileName); 968 switch (Locked) { 969 case LockFileManager::LFS_Error: 970 return; 971 972 case LockFileManager::LFS_Owned: 973 // We're responsible for building the module ourselves. Do so below. 974 break; 975 976 case LockFileManager::LFS_Shared: 977 // Someone else is responsible for building the module. Wait for them to 978 // finish. 979 Locked.waitForUnlock(); 980 break; 981 } 982 983 ModuleMap &ModMap 984 = ImportingInstance.getPreprocessor().getHeaderSearchInfo().getModuleMap(); 985 986 // Construct a compiler invocation for creating this module. 987 llvm::IntrusiveRefCntPtr<CompilerInvocation> Invocation 988 (new CompilerInvocation(ImportingInstance.getInvocation())); 989 990 PreprocessorOptions &PPOpts = Invocation->getPreprocessorOpts(); 991 992 // For any options that aren't intended to affect how a module is built, 993 // reset them to their default values. 994 Invocation->getLangOpts()->resetNonModularOptions(); 995 PPOpts.resetNonModularOptions(); 996 997 // Note the name of the module we're building. 998 Invocation->getLangOpts()->CurrentModule = Module->getTopLevelModuleName(); 999 1000 // Note that this module is part of the module build path, so that we 1001 // can detect cycles in the module graph. 1002 PPOpts.ModuleBuildPath.push_back(Module->getTopLevelModuleName()); 1003 1004 // If there is a module map file, build the module using the module map. 1005 // Set up the inputs/outputs so that we build the module from its umbrella 1006 // header. 1007 FrontendOptions &FrontendOpts = Invocation->getFrontendOpts(); 1008 FrontendOpts.OutputFile = ModuleFileName.str(); 1009 FrontendOpts.DisableFree = false; 1010 FrontendOpts.Inputs.clear(); 1011 InputKind IK = getSourceInputKindFromOptions(*Invocation->getLangOpts()); 1012 1013 // Get or create the module map that we'll use to build this module. 1014 llvm::SmallString<128> TempModuleMapFileName; 1015 if (const FileEntry *ModuleMapFile 1016 = ModMap.getContainingModuleMapFile(Module)) { 1017 // Use the module map where this module resides. 1018 FrontendOpts.Inputs.push_back(std::make_pair(IK, ModuleMapFile->getName())); 1019 } else { 1020 // Create a temporary module map file. 1021 TempModuleMapFileName = Module->Name; 1022 TempModuleMapFileName += "-%%%%%%%%.map"; 1023 int FD; 1024 if (llvm::sys::fs::unique_file(TempModuleMapFileName.str(), FD, 1025 TempModuleMapFileName, 1026 /*makeAbsolute=*/false) 1027 != llvm::errc::success) 1028 return; 1029 1030 // Print the module map to this file. 1031 llvm::raw_fd_ostream OS(FD, /*shouldClose=*/true); 1032 Module->print(OS); 1033 FrontendOpts.Inputs.push_back( 1034 std::make_pair(IK, TempModuleMapFileName.str().str())); 1035 } 1036 1037 // Don't free the remapped file buffers; they are owned by our caller. 1038 PPOpts.RetainRemappedFileBuffers = true; 1039 1040 Invocation->getDiagnosticOpts().VerifyDiagnostics = 0; 1041 assert(ImportingInstance.getInvocation().getModuleHash() == 1042 Invocation->getModuleHash() && "Module hash mismatch!"); 1043 1044 // Construct a compiler instance that will be used to actually create the 1045 // module. 1046 CompilerInstance Instance; 1047 Instance.setInvocation(&*Invocation); 1048 Instance.createDiagnostics(/*argc=*/0, /*argv=*/0, 1049 &ImportingInstance.getDiagnosticClient(), 1050 /*ShouldOwnClient=*/true, 1051 /*ShouldCloneClient=*/true); 1052 1053 // Construct a module-generating action. 1054 GenerateModuleAction CreateModuleAction; 1055 1056 // Execute the action to actually build the module in-place. Use a separate 1057 // thread so that we get a stack large enough. 1058 const unsigned ThreadStackSize = 8 << 20; 1059 llvm::CrashRecoveryContext CRC; 1060 CompileModuleMapData Data = { Instance, CreateModuleAction }; 1061 CRC.RunSafelyOnThread(&doCompileMapModule, &Data, ThreadStackSize); 1062 1063 // Delete the temporary module map file. 1064 // FIXME: Even though we're executing under crash protection, it would still 1065 // be nice to do this with RemoveFileOnSignal when we can. However, that 1066 // doesn't make sense for all clients, so clean this up manually. 1067 if (!TempModuleMapFileName.empty()) 1068 llvm::sys::Path(TempModuleMapFileName).eraseFromDisk(); 1069} 1070 1071ModuleKey CompilerInstance::loadModule(SourceLocation ImportLoc, 1072 ModuleIdPath Path) { 1073 // If we've already handled this import, just return the cached result. 1074 // This one-element cache is important to eliminate redundant diagnostics 1075 // when both the preprocessor and parser see the same import declaration. 1076 if (!ImportLoc.isInvalid() && LastModuleImportLoc == ImportLoc) 1077 return LastModuleImportResult; 1078 1079 // Determine what file we're searching from. 1080 SourceManager &SourceMgr = getSourceManager(); 1081 SourceLocation ExpandedImportLoc = SourceMgr.getExpansionLoc(ImportLoc); 1082 const FileEntry *CurFile 1083 = SourceMgr.getFileEntryForID(SourceMgr.getFileID(ExpandedImportLoc)); 1084 if (!CurFile) 1085 CurFile = SourceMgr.getFileEntryForID(SourceMgr.getMainFileID()); 1086 1087 StringRef ModuleName = Path[0].first->getName(); 1088 SourceLocation ModuleNameLoc = Path[0].second; 1089 1090 ModuleMap::Module *Module = 0; 1091 const FileEntry *ModuleFile = 0; 1092 1093 // If we don't already have information on this module, load the module now. 1094 llvm::DenseMap<const IdentifierInfo *, ModuleMap::Module *>::iterator Known 1095 = KnownModules.find(Path[0].first); 1096 if (Known == KnownModules.end()) { 1097 // Search for a module with the given name. 1098 std::string ModuleFileName; 1099 ModuleFile 1100 = PP->getHeaderSearchInfo().lookupModule(ModuleName, Module, 1101 &ModuleFileName); 1102 1103 bool BuildingModule = false; 1104 if (!ModuleFile && Module) { 1105 // The module is not cached, but we have a module map from which we can 1106 // build the module. 1107 1108 // Check whether there is a cycle in the module graph. 1109 SmallVectorImpl<std::string> &ModuleBuildPath 1110 = getPreprocessorOpts().ModuleBuildPath; 1111 SmallVectorImpl<std::string>::iterator Pos 1112 = std::find(ModuleBuildPath.begin(), ModuleBuildPath.end(), ModuleName); 1113 if (Pos != ModuleBuildPath.end()) { 1114 llvm::SmallString<256> CyclePath; 1115 for (; Pos != ModuleBuildPath.end(); ++Pos) { 1116 CyclePath += *Pos; 1117 CyclePath += " -> "; 1118 } 1119 CyclePath += ModuleName; 1120 1121 getDiagnostics().Report(ModuleNameLoc, diag::err_module_cycle) 1122 << ModuleName << CyclePath; 1123 return 0; 1124 } 1125 1126 getDiagnostics().Report(ModuleNameLoc, diag::warn_module_build) 1127 << ModuleName; 1128 BuildingModule = true; 1129 compileModule(*this, Module, ModuleFileName); 1130 ModuleFile = FileMgr->getFile(ModuleFileName); 1131 } 1132 1133 if (!ModuleFile) { 1134 getDiagnostics().Report(ModuleNameLoc, 1135 BuildingModule? diag::err_module_not_built 1136 : diag::err_module_not_found) 1137 << ModuleName 1138 << SourceRange(ImportLoc, ModuleNameLoc); 1139 return 0; 1140 } 1141 1142 // If we don't already have an ASTReader, create one now. 1143 if (!ModuleManager) { 1144 if (!hasASTContext()) 1145 createASTContext(); 1146 1147 std::string Sysroot = getHeaderSearchOpts().Sysroot; 1148 const PreprocessorOptions &PPOpts = getPreprocessorOpts(); 1149 ModuleManager = new ASTReader(getPreprocessor(), *Context, 1150 Sysroot.empty() ? "" : Sysroot.c_str(), 1151 PPOpts.DisablePCHValidation, 1152 PPOpts.DisableStatCache); 1153 if (hasASTConsumer()) { 1154 ModuleManager->setDeserializationListener( 1155 getASTConsumer().GetASTDeserializationListener()); 1156 getASTContext().setASTMutationListener( 1157 getASTConsumer().GetASTMutationListener()); 1158 } 1159 llvm::OwningPtr<ExternalASTSource> Source; 1160 Source.reset(ModuleManager); 1161 getASTContext().setExternalSource(Source); 1162 if (hasSema()) 1163 ModuleManager->InitializeSema(getSema()); 1164 if (hasASTConsumer()) 1165 ModuleManager->StartTranslationUnit(&getASTConsumer()); 1166 } 1167 1168 // Try to load the module we found. 1169 switch (ModuleManager->ReadAST(ModuleFile->getName(), 1170 serialization::MK_Module)) { 1171 case ASTReader::Success: 1172 break; 1173 1174 case ASTReader::IgnorePCH: 1175 // FIXME: The ASTReader will already have complained, but can we showhorn 1176 // that diagnostic information into a more useful form? 1177 KnownModules[Path[0].first] = 0; 1178 return 0; 1179 1180 case ASTReader::Failure: 1181 // Already complained, but note now that we failed. 1182 KnownModules[Path[0].first] = 0; 1183 return 0; 1184 } 1185 1186 if (!Module) { 1187 // If we loaded the module directly, without finding a module map first, 1188 // we'll have loaded the module's information from the module itself. 1189 Module = PP->getHeaderSearchInfo().getModuleMap() 1190 .findModule((Path[0].first->getName())); 1191 } 1192 1193 // Cache the result of this top-level module lookup for later. 1194 Known = KnownModules.insert(std::make_pair(Path[0].first, Module)).first; 1195 } else { 1196 // Retrieve the cached top-level module. 1197 Module = Known->second; 1198 } 1199 1200 // If we never found the module, fail. 1201 if (!Module) 1202 return 0; 1203 1204 // Verify that the rest of the module path actually corresponds to 1205 // a submodule. 1206 if (Path.size() > 1) { 1207 for (unsigned I = 1, N = Path.size(); I != N; ++I) { 1208 StringRef Name = Path[I].first->getName(); 1209 llvm::StringMap<ModuleMap::Module *>::iterator Pos 1210 = Module->SubModules.find(Name); 1211 1212 if (Pos == Module->SubModules.end()) { 1213 // Attempt to perform typo correction to find a module name that works. 1214 llvm::SmallVector<StringRef, 2> Best; 1215 unsigned BestEditDistance = (std::numeric_limits<unsigned>::max)(); 1216 1217 for (llvm::StringMap<ModuleMap::Module *>::iterator 1218 I = Module->SubModules.begin(), 1219 IEnd = Module->SubModules.end(); 1220 I != IEnd; ++I) { 1221 unsigned ED = Name.edit_distance(I->getValue()->Name, 1222 /*AllowReplacements=*/true, 1223 BestEditDistance); 1224 if (ED <= BestEditDistance) { 1225 if (ED < BestEditDistance) 1226 Best.clear(); 1227 Best.push_back(I->getValue()->Name); 1228 } 1229 } 1230 1231 // If there was a clear winner, user it. 1232 if (Best.size() == 1) { 1233 getDiagnostics().Report(Path[I].second, 1234 diag::err_no_submodule_suggest) 1235 << Path[I].first << Module->getFullModuleName() << Best[0] 1236 << SourceRange(Path[0].second, Path[I-1].second) 1237 << FixItHint::CreateReplacement(SourceRange(Path[I].second), 1238 Best[0]); 1239 Pos = Module->SubModules.find(Best[0]); 1240 } 1241 } 1242 1243 if (Pos == Module->SubModules.end()) { 1244 // No submodule by this name. Complain, and don't look for further 1245 // submodules. 1246 getDiagnostics().Report(Path[I].second, diag::err_no_submodule) 1247 << Path[I].first << Module->getFullModuleName() 1248 << SourceRange(Path[0].second, Path[I-1].second); 1249 break; 1250 } 1251 1252 Module = Pos->getValue(); 1253 } 1254 } 1255 1256 // FIXME: Tell the AST reader to make the named submodule visible. 1257 1258 LastModuleImportLoc = ImportLoc; 1259 LastModuleImportResult = Module; 1260 return Module; 1261} 1262 1263