contrib/llvm/tools/clang/lib/ARCMigrate/ARCMT.cpp

   1 //===--- ARCMT.cpp - Migration to ARC mode --------------------------------===//
   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 "Internals.h"
  11 #include "clang/AST/ASTConsumer.h"
  12 #include "clang/Basic/DiagnosticCategories.h"
  13 #include "clang/Frontend/ASTUnit.h"
  14 #include "clang/Frontend/CompilerInstance.h"
  15 #include "clang/Frontend/FrontendAction.h"
  16 #include "clang/Frontend/TextDiagnosticPrinter.h"
  17 #include "clang/Frontend/Utils.h"
  18 #include "clang/Lex/Preprocessor.h"
  19 #include "clang/Rewrite/Core/Rewriter.h"
  20 #include "clang/Sema/SemaDiagnostic.h"
  21 #include "clang/Serialization/ASTReader.h"
  22 #include "llvm/ADT/Triple.h"
  23 #include "llvm/Support/MemoryBuffer.h"
  24 using namespace clang;
  25 using namespace arcmt;
  26
  27 bool CapturedDiagList::clearDiagnostic(ArrayRef<unsigned> IDs,
  28                                        SourceRange range) {
  29   if (range.isInvalid())
  30     return false;
  31
  32   bool cleared = false;
  33   ListTy::iterator I = List.begin();
  34   while (I != List.end()) {
  35     FullSourceLoc diagLoc = I->getLocation();
  36     if ((IDs.empty() || // empty means clear all diagnostics in the range.
  37          std::find(IDs.begin(), IDs.end(), I->getID()) != IDs.end()) &&
  38         !diagLoc.isBeforeInTranslationUnitThan(range.getBegin()) &&
  39         (diagLoc == range.getEnd() ||
  40            diagLoc.isBeforeInTranslationUnitThan(range.getEnd()))) {
  41       cleared = true;
  42       ListTy::iterator eraseS = I++;
  43       if (eraseS->getLevel() != DiagnosticsEngine::Note)
  44         while (I != List.end() && I->getLevel() == DiagnosticsEngine::Note)
  45           ++I;
  46       // Clear the diagnostic and any notes following it.
  47       I = List.erase(eraseS, I);
  48       continue;
  49     }
  50
  51     ++I;
  52   }
  53
  54   return cleared;
  55 }
  56
  57 bool CapturedDiagList::hasDiagnostic(ArrayRef<unsigned> IDs,
  58                                      SourceRange range) const {
  59   if (range.isInvalid())
  60     return false;
  61
  62   ListTy::const_iterator I = List.begin();
  63   while (I != List.end()) {
  64     FullSourceLoc diagLoc = I->getLocation();
  65     if ((IDs.empty() || // empty means any diagnostic in the range.
  66          std::find(IDs.begin(), IDs.end(), I->getID()) != IDs.end()) &&
  67         !diagLoc.isBeforeInTranslationUnitThan(range.getBegin()) &&
  68         (diagLoc == range.getEnd() ||
  69            diagLoc.isBeforeInTranslationUnitThan(range.getEnd()))) {
  70       return true;
  71     }
  72
  73     ++I;
  74   }
  75
  76   return false;
  77 }
  78
  79 void CapturedDiagList::reportDiagnostics(DiagnosticsEngine &Diags) const {
  80   for (ListTy::const_iterator I = List.begin(), E = List.end(); I != E; ++I)
  81     Diags.Report(*I);
  82 }
  83
  84 bool CapturedDiagList::hasErrors() const {
  85   for (ListTy::const_iterator I = List.begin(), E = List.end(); I != E; ++I)
  86     if (I->getLevel() >= DiagnosticsEngine::Error)
  87       return true;
  88
  89   return false;
  90 }
  91
  92 namespace {
  93
  94 class CaptureDiagnosticConsumer : public DiagnosticConsumer {
  95   DiagnosticsEngine &Diags;
  96   DiagnosticConsumer &DiagClient;
  97   CapturedDiagList &CapturedDiags;
  98   bool HasBegunSourceFile;
  99 public:
 100   CaptureDiagnosticConsumer(DiagnosticsEngine &diags,
 101                             DiagnosticConsumer &client,
 102                             CapturedDiagList &capturedDiags)
 103     : Diags(diags), DiagClient(client), CapturedDiags(capturedDiags),
 104       HasBegunSourceFile(false) { }
 105
 106   virtual void BeginSourceFile(const LangOptions &Opts,
 107                                const Preprocessor *PP) {
 108     // Pass BeginSourceFile message onto DiagClient on first call.
 109     // The corresponding EndSourceFile call will be made from an
 110     // explicit call to FinishCapture.
 111     if (!HasBegunSourceFile) {
 112       DiagClient.BeginSourceFile(Opts, PP);
 113       HasBegunSourceFile = true;
 114     }
 115   }
 116
 117   void FinishCapture() {
 118     // Call EndSourceFile on DiagClient on completion of capture to
 119     // enable VerifyDiagnosticConsumer to check diagnostics *after*
 120     // it has received the diagnostic list.
 121     if (HasBegunSourceFile) {
 122       DiagClient.EndSourceFile();
 123       HasBegunSourceFile = false;
 124     }
 125   }
 126
 127   virtual ~CaptureDiagnosticConsumer() {
 128     assert(!HasBegunSourceFile && "FinishCapture not called!");
 129   }
 130
 131   virtual void HandleDiagnostic(DiagnosticsEngine::Level level,
 132                                 const Diagnostic &Info) {
 133     if (DiagnosticIDs::isARCDiagnostic(Info.getID()) ||
 134         level >= DiagnosticsEngine::Error || level == DiagnosticsEngine::Note) {
 135       if (Info.getLocation().isValid())
 136         CapturedDiags.push_back(StoredDiagnostic(level, Info));
 137       return;
 138     }
 139
 140     // Non-ARC warnings are ignored.
 141     Diags.setLastDiagnosticIgnored();
 142   }
 143 };
 144
 145 } // end anonymous namespace
 146
 147 static bool HasARCRuntime(CompilerInvocation &origCI) {
 148   // This duplicates some functionality from Darwin::AddDeploymentTarget
 149   // but this function is well defined, so keep it decoupled from the driver
 150   // and avoid unrelated complications.
 151   llvm::Triple triple(origCI.getTargetOpts().Triple);
 152
 153   if (triple.isiOS())
 154     return triple.getOSMajorVersion() >= 5;
 155
 156   if (triple.getOS() == llvm::Triple::Darwin)
 157     return triple.getOSMajorVersion() >= 11;
 158
 159   if (triple.getOS() == llvm::Triple::MacOSX) {
 160     unsigned Major, Minor, Micro;
 161     triple.getOSVersion(Major, Minor, Micro);
 162     return Major > 10 || (Major == 10 && Minor >= 7);
 163   }
 164
 165   return false;
 166 }
 167
 168 static CompilerInvocation *
 169 createInvocationForMigration(CompilerInvocation &origCI) {
 170   OwningPtr<CompilerInvocation> CInvok;
 171   CInvok.reset(new CompilerInvocation(origCI));
 172   PreprocessorOptions &PPOpts = CInvok->getPreprocessorOpts();
 173   if (!PPOpts.ImplicitPCHInclude.empty()) {
 174     // We can't use a PCH because it was likely built in non-ARC mode and we
 175     // want to parse in ARC. Include the original header.
 176     FileManager FileMgr(origCI.getFileSystemOpts());
 177     IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 178     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 179         new DiagnosticsEngine(DiagID, &origCI.getDiagnosticOpts(),
 180                               new IgnoringDiagConsumer()));
 181     std::string OriginalFile =
 182         ASTReader::getOriginalSourceFile(PPOpts.ImplicitPCHInclude,
 183                                          FileMgr, *Diags);
 184     if (!OriginalFile.empty())
 185       PPOpts.Includes.insert(PPOpts.Includes.begin(), OriginalFile);
 186     PPOpts.ImplicitPCHInclude.clear();
 187   }
 188   // FIXME: Get the original header of a PTH as well.
 189   CInvok->getPreprocessorOpts().ImplicitPTHInclude.clear();
 190   std::string define = getARCMTMacroName();
 191   define += '=';
 192   CInvok->getPreprocessorOpts().addMacroDef(define);
 193   CInvok->getLangOpts()->ObjCAutoRefCount = true;
 194   CInvok->getLangOpts()->setGC(LangOptions::NonGC);
 195   CInvok->getDiagnosticOpts().ErrorLimit = 0;
 196   CInvok->getDiagnosticOpts().PedanticErrors = 0;
 197
 198   // Ignore -Werror flags when migrating.
 199   std::vector<std::string> WarnOpts;
 200   for (std::vector<std::string>::iterator
 201          I = CInvok->getDiagnosticOpts().Warnings.begin(),
 202          E = CInvok->getDiagnosticOpts().Warnings.end(); I != E; ++I) {
 203     if (!StringRef(*I).startswith("error"))
 204       WarnOpts.push_back(*I);
 205   }
 206   WarnOpts.push_back("error=arc-unsafe-retained-assign");
 207   CInvok->getDiagnosticOpts().Warnings = llvm_move(WarnOpts);
 208
 209   CInvok->getLangOpts()->ObjCARCWeak = HasARCRuntime(origCI);
 210
 211   return CInvok.take();
 212 }
 213
 214 static void emitPremigrationErrors(const CapturedDiagList &arcDiags,
 215                                    DiagnosticOptions *diagOpts,
 216                                    Preprocessor &PP) {
 217   TextDiagnosticPrinter printer(llvm::errs(), diagOpts);
 218   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 219   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 220       new DiagnosticsEngine(DiagID, diagOpts, &printer,
 221                             /*ShouldOwnClient=*/false));
 222   Diags->setSourceManager(&PP.getSourceManager());
 223
 224   printer.BeginSourceFile(PP.getLangOpts(), &PP);
 225   arcDiags.reportDiagnostics(*Diags);
 226   printer.EndSourceFile();
 227 }
 228
 229 //===----------------------------------------------------------------------===//
 230 // checkForManualIssues.
 231 //===----------------------------------------------------------------------===//
 232
 233 bool arcmt::checkForManualIssues(CompilerInvocation &origCI,
 234                                  const FrontendInputFile &Input,
 235                                  DiagnosticConsumer *DiagClient,
 236                                  bool emitPremigrationARCErrors,
 237                                  StringRef plistOut) {
 238   if (!origCI.getLangOpts()->ObjC1)
 239     return false;
 240
 241   LangOptions::GCMode OrigGCMode = origCI.getLangOpts()->getGC();
 242   bool NoNSAllocReallocError = origCI.getMigratorOpts().NoNSAllocReallocError;
 243   bool NoFinalizeRemoval = origCI.getMigratorOpts().NoFinalizeRemoval;
 244
 245   std::vector<TransformFn> transforms = arcmt::getAllTransformations(OrigGCMode,
 246                                                                      NoFinalizeRemoval);
 247   assert(!transforms.empty());
 248
 249   OwningPtr<CompilerInvocation> CInvok;
 250   CInvok.reset(createInvocationForMigration(origCI));
 251   CInvok->getFrontendOpts().Inputs.clear();
 252   CInvok->getFrontendOpts().Inputs.push_back(Input);
 253
 254   CapturedDiagList capturedDiags;
 255
 256   assert(DiagClient);
 257   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 258   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 259       new DiagnosticsEngine(DiagID, &origCI.getDiagnosticOpts(),
 260                             DiagClient, /*ShouldOwnClient=*/false));
 261
 262   // Filter of all diagnostics.
 263   CaptureDiagnosticConsumer errRec(*Diags, *DiagClient, capturedDiags);
 264   Diags->setClient(&errRec, /*ShouldOwnClient=*/false);
 265
 266   OwningPtr<ASTUnit> Unit(
 267       ASTUnit::LoadFromCompilerInvocationAction(CInvok.take(), Diags));
 268   if (!Unit) {
 269     errRec.FinishCapture();
 270     return true;
 271   }
 272
 273   // Don't filter diagnostics anymore.
 274   Diags->setClient(DiagClient, /*ShouldOwnClient=*/false);
 275
 276   ASTContext &Ctx = Unit->getASTContext();
 277
 278   if (Diags->hasFatalErrorOccurred()) {
 279     Diags->Reset();
 280     DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
 281     capturedDiags.reportDiagnostics(*Diags);
 282     DiagClient->EndSourceFile();
 283     errRec.FinishCapture();
 284     return true;
 285   }
 286
 287   if (emitPremigrationARCErrors)
 288     emitPremigrationErrors(capturedDiags, &origCI.getDiagnosticOpts(),
 289                            Unit->getPreprocessor());
 290   if (!plistOut.empty()) {
 291     SmallVector<StoredDiagnostic, 8> arcDiags;
 292     for (CapturedDiagList::iterator
 293            I = capturedDiags.begin(), E = capturedDiags.end(); I != E; ++I)
 294       arcDiags.push_back(*I);
 295     writeARCDiagsToPlist(plistOut, arcDiags,
 296                          Ctx.getSourceManager(), Ctx.getLangOpts());
 297   }
 298
 299   // After parsing of source files ended, we want to reuse the
 300   // diagnostics objects to emit further diagnostics.
 301   // We call BeginSourceFile because DiagnosticConsumer requires that
 302   // diagnostics with source range information are emitted only in between
 303   // BeginSourceFile() and EndSourceFile().
 304   DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
 305
 306   // No macros will be added since we are just checking and we won't modify
 307   // source code.
 308   std::vector<SourceLocation> ARCMTMacroLocs;
 309
 310   TransformActions testAct(*Diags, capturedDiags, Ctx, Unit->getPreprocessor());
 311   MigrationPass pass(Ctx, OrigGCMode, Unit->getSema(), testAct, capturedDiags,
 312                      ARCMTMacroLocs);
 313   pass.setNSAllocReallocError(NoNSAllocReallocError);
 314   pass.setNoFinalizeRemoval(NoFinalizeRemoval);
 315
 316   for (unsigned i=0, e = transforms.size(); i != e; ++i)
 317     transforms[i](pass);
 318
 319   capturedDiags.reportDiagnostics(*Diags);
 320
 321   DiagClient->EndSourceFile();
 322   errRec.FinishCapture();
 323
 324   return capturedDiags.hasErrors() || testAct.hasReportedErrors();
 325 }
 326
 327 //===----------------------------------------------------------------------===//
 328 // applyTransformations.
 329 //===----------------------------------------------------------------------===//
 330
 331 static bool applyTransforms(CompilerInvocation &origCI,
 332                             const FrontendInputFile &Input,
 333                             DiagnosticConsumer *DiagClient,
 334                             StringRef outputDir,
 335                             bool emitPremigrationARCErrors,
 336                             StringRef plistOut) {
 337   if (!origCI.getLangOpts()->ObjC1)
 338     return false;
 339
 340   LangOptions::GCMode OrigGCMode = origCI.getLangOpts()->getGC();
 341
 342   // Make sure checking is successful first.
 343   CompilerInvocation CInvokForCheck(origCI);
 344   if (arcmt::checkForManualIssues(CInvokForCheck, Input, DiagClient,
 345                                   emitPremigrationARCErrors, plistOut))
 346     return true;
 347
 348   CompilerInvocation CInvok(origCI);
 349   CInvok.getFrontendOpts().Inputs.clear();
 350   CInvok.getFrontendOpts().Inputs.push_back(Input);
 351
 352   MigrationProcess migration(CInvok, DiagClient, outputDir);
 353   bool NoFinalizeRemoval = origCI.getMigratorOpts().NoFinalizeRemoval;
 354
 355   std::vector<TransformFn> transforms = arcmt::getAllTransformations(OrigGCMode,
 356                                                                      NoFinalizeRemoval);
 357   assert(!transforms.empty());
 358
 359   for (unsigned i=0, e = transforms.size(); i != e; ++i) {
 360     bool err = migration.applyTransform(transforms[i]);
 361     if (err) return true;
 362   }
 363
 364   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 365   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 366       new DiagnosticsEngine(DiagID, &origCI.getDiagnosticOpts(),
 367                             DiagClient, /*ShouldOwnClient=*/false));
 368
 369   if (outputDir.empty()) {
 370     origCI.getLangOpts()->ObjCAutoRefCount = true;
 371     return migration.getRemapper().overwriteOriginal(*Diags);
 372   } else {
 373     return migration.getRemapper().flushToDisk(outputDir, *Diags);
 374   }
 375 }
 376
 377 bool arcmt::applyTransformations(CompilerInvocation &origCI,
 378                                  const FrontendInputFile &Input,
 379                                  DiagnosticConsumer *DiagClient) {
 380   return applyTransforms(origCI, Input, DiagClient,
 381                          StringRef(), false, StringRef());
 382 }
 383
 384 bool arcmt::migrateWithTemporaryFiles(CompilerInvocation &origCI,
 385                                       const FrontendInputFile &Input,
 386                                       DiagnosticConsumer *DiagClient,
 387                                       StringRef outputDir,
 388                                       bool emitPremigrationARCErrors,
 389                                       StringRef plistOut) {
 390   assert(!outputDir.empty() && "Expected output directory path");
 391   return applyTransforms(origCI, Input, DiagClient,
 392                          outputDir, emitPremigrationARCErrors, plistOut);
 393 }
 394
 395 bool arcmt::getFileRemappings(std::vector<std::pair<std::string,std::string> > &
 396                                   remap,
 397                               StringRef outputDir,
 398                               DiagnosticConsumer *DiagClient) {
 399   assert(!outputDir.empty());
 400
 401   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 402   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 403       new DiagnosticsEngine(DiagID, new DiagnosticOptions,
 404                             DiagClient, /*ShouldOwnClient=*/false));
 405
 406   FileRemapper remapper;
 407   bool err = remapper.initFromDisk(outputDir, *Diags,
 408                                    /*ignoreIfFilesChanged=*/true);
 409   if (err)
 410     return true;
 411
 412   PreprocessorOptions PPOpts;
 413   remapper.applyMappings(PPOpts);
 414   remap = PPOpts.RemappedFiles;
 415
 416   return false;
 417 }
 418
 419 bool arcmt::getFileRemappingsFromFileList(
 420                         std::vector<std::pair<std::string,std::string> > &remap,
 421                         ArrayRef<StringRef> remapFiles,
 422                         DiagnosticConsumer *DiagClient) {
 423   bool hasErrorOccurred = false;
 424   llvm::StringMap<bool> Uniquer;
 425
 426   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 427   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 428       new DiagnosticsEngine(DiagID, new DiagnosticOptions,
 429                             DiagClient, /*ShouldOwnClient=*/false));
 430
 431   for (ArrayRef<StringRef>::iterator
 432          I = remapFiles.begin(), E = remapFiles.end(); I != E; ++I) {
 433     StringRef file = *I;
 434
 435     FileRemapper remapper;
 436     bool err = remapper.initFromFile(file, *Diags,
 437                                      /*ignoreIfFilesChanged=*/true);
 438     hasErrorOccurred = hasErrorOccurred || err;
 439     if (err)
 440       continue;
 441
 442     PreprocessorOptions PPOpts;
 443     remapper.applyMappings(PPOpts);
 444     for (PreprocessorOptions::remapped_file_iterator
 445            RI = PPOpts.remapped_file_begin(), RE = PPOpts.remapped_file_end();
 446            RI != RE; ++RI) {
 447       bool &inserted = Uniquer[RI->first];
 448       if (inserted)
 449         continue;
 450       inserted = true;
 451       remap.push_back(*RI);
 452     }
 453   }
 454
 455   return hasErrorOccurred;
 456 }
 457
 458 //===----------------------------------------------------------------------===//
 459 // CollectTransformActions.
 460 //===----------------------------------------------------------------------===//
 461
 462 namespace {
 463
 464 class ARCMTMacroTrackerPPCallbacks : public PPCallbacks {
 465   std::vector<SourceLocation> &ARCMTMacroLocs;
 466
 467 public:
 468   ARCMTMacroTrackerPPCallbacks(std::vector<SourceLocation> &ARCMTMacroLocs)
 469     : ARCMTMacroLocs(ARCMTMacroLocs) { }
 470
 471   virtual void MacroExpands(const Token &MacroNameTok, const MacroDirective *MD,
 472                             SourceRange Range, const MacroArgs *Args) {
 473     if (MacroNameTok.getIdentifierInfo()->getName() == getARCMTMacroName())
 474       ARCMTMacroLocs.push_back(MacroNameTok.getLocation());
 475   }
 476 };
 477
 478 class ARCMTMacroTrackerAction : public ASTFrontendAction {
 479   std::vector<SourceLocation> &ARCMTMacroLocs;
 480
 481 public:
 482   ARCMTMacroTrackerAction(std::vector<SourceLocation> &ARCMTMacroLocs)
 483     : ARCMTMacroLocs(ARCMTMacroLocs) { }
 484
 485   virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
 486                                          StringRef InFile) {
 487     CI.getPreprocessor().addPPCallbacks(
 488                               new ARCMTMacroTrackerPPCallbacks(ARCMTMacroLocs));
 489     return new ASTConsumer();
 490   }
 491 };
 492
 493 class RewritesApplicator : public TransformActions::RewriteReceiver {
 494   Rewriter &rewriter;
 495   MigrationProcess::RewriteListener *Listener;
 496
 497 public:
 498   RewritesApplicator(Rewriter &rewriter, ASTContext &ctx,
 499                      MigrationProcess::RewriteListener *listener)
 500     : rewriter(rewriter), Listener(listener) {
 501     if (Listener)
 502       Listener->start(ctx);
 503   }
 504   ~RewritesApplicator() {
 505     if (Listener)
 506       Listener->finish();
 507   }
 508
 509   virtual void insert(SourceLocation loc, StringRef text) {
 510     bool err = rewriter.InsertText(loc, text, /*InsertAfter=*/true,
 511                                    /*indentNewLines=*/true);
 512     if (!err && Listener)
 513       Listener->insert(loc, text);
 514   }
 515
 516   virtual void remove(CharSourceRange range) {
 517     Rewriter::RewriteOptions removeOpts;
 518     removeOpts.IncludeInsertsAtBeginOfRange = false;
 519     removeOpts.IncludeInsertsAtEndOfRange = false;
 520     removeOpts.RemoveLineIfEmpty = true;
 521
 522     bool err = rewriter.RemoveText(range, removeOpts);
 523     if (!err && Listener)
 524       Listener->remove(range);
 525   }
 526
 527   virtual void increaseIndentation(CharSourceRange range,
 528                                     SourceLocation parentIndent) {
 529     rewriter.IncreaseIndentation(range, parentIndent);
 530   }
 531 };
 532
 533 } // end anonymous namespace.
 534
 535 /// \brief Anchor for VTable.
 536 MigrationProcess::RewriteListener::~RewriteListener() { }
 537
 538 MigrationProcess::MigrationProcess(const CompilerInvocation &CI,
 539                                    DiagnosticConsumer *diagClient,
 540                                    StringRef outputDir)
 541   : OrigCI(CI), DiagClient(diagClient), HadARCErrors(false) {
 542   if (!outputDir.empty()) {
 543     IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 544     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 545       new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(),
 546                             DiagClient, /*ShouldOwnClient=*/false));
 547     Remapper.initFromDisk(outputDir, *Diags, /*ignoreIfFilesChanges=*/true);
 548   }
 549 }
 550
 551 bool MigrationProcess::applyTransform(TransformFn trans,
 552                                       RewriteListener *listener) {
 553   OwningPtr<CompilerInvocation> CInvok;
 554   CInvok.reset(createInvocationForMigration(OrigCI));
 555   CInvok->getDiagnosticOpts().IgnoreWarnings = true;
 556
 557   Remapper.applyMappings(CInvok->getPreprocessorOpts());
 558
 559   CapturedDiagList capturedDiags;
 560   std::vector<SourceLocation> ARCMTMacroLocs;
 561
 562   assert(DiagClient);
 563   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 564   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
 565       new DiagnosticsEngine(DiagID, new DiagnosticOptions,
 566                             DiagClient, /*ShouldOwnClient=*/false));
 567
 568   // Filter of all diagnostics.
 569   CaptureDiagnosticConsumer errRec(*Diags, *DiagClient, capturedDiags);
 570   Diags->setClient(&errRec, /*ShouldOwnClient=*/false);
 571
 572   OwningPtr<ARCMTMacroTrackerAction> ASTAction;
 573   ASTAction.reset(new ARCMTMacroTrackerAction(ARCMTMacroLocs));
 574
 575   OwningPtr<ASTUnit> Unit(
 576       ASTUnit::LoadFromCompilerInvocationAction(CInvok.take(), Diags,
 577                                                 ASTAction.get()));
 578   if (!Unit) {
 579     errRec.FinishCapture();
 580     return true;
 581   }
 582   Unit->setOwnsRemappedFileBuffers(false); // FileRemapper manages that.
 583
 584   HadARCErrors = HadARCErrors || capturedDiags.hasErrors();
 585
 586   // Don't filter diagnostics anymore.
 587   Diags->setClient(DiagClient, /*ShouldOwnClient=*/false);
 588
 589   ASTContext &Ctx = Unit->getASTContext();
 590
 591   if (Diags->hasFatalErrorOccurred()) {
 592     Diags->Reset();
 593     DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
 594     capturedDiags.reportDiagnostics(*Diags);
 595     DiagClient->EndSourceFile();
 596     errRec.FinishCapture();
 597     return true;
 598   }
 599
 600   // After parsing of source files ended, we want to reuse the
 601   // diagnostics objects to emit further diagnostics.
 602   // We call BeginSourceFile because DiagnosticConsumer requires that
 603   // diagnostics with source range information are emitted only in between
 604   // BeginSourceFile() and EndSourceFile().
 605   DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
 606
 607   Rewriter rewriter(Ctx.getSourceManager(), Ctx.getLangOpts());
 608   TransformActions TA(*Diags, capturedDiags, Ctx, Unit->getPreprocessor());
 609   MigrationPass pass(Ctx, OrigCI.getLangOpts()->getGC(),
 610                      Unit->getSema(), TA, capturedDiags, ARCMTMacroLocs);
 611
 612   trans(pass);
 613
 614   {
 615     RewritesApplicator applicator(rewriter, Ctx, listener);
 616     TA.applyRewrites(applicator);
 617   }
 618
 619   DiagClient->EndSourceFile();
 620   errRec.FinishCapture();
 621
 622   if (DiagClient->getNumErrors())
 623     return true;
 624
 625   for (Rewriter::buffer_iterator
 626         I = rewriter.buffer_begin(), E = rewriter.buffer_end(); I != E; ++I) {
 627     FileID FID = I->first;
 628     RewriteBuffer &buf = I->second;
 629     const FileEntry *file = Ctx.getSourceManager().getFileEntryForID(FID);
 630     assert(file);
 631     std::string newFname = file->getName();
 632     newFname += "-trans";
 633     SmallString<512> newText;
 634     llvm::raw_svector_ostream vecOS(newText);
 635     buf.write(vecOS);
 636     vecOS.flush();
 637     llvm::MemoryBuffer *memBuf = llvm::MemoryBuffer::getMemBufferCopy(
 638                    StringRef(newText.data(), newText.size()), newFname);
 639     SmallString<64> filePath(file->getName());
 640     Unit->getFileManager().FixupRelativePath(filePath);
 641     Remapper.remap(filePath.str(), memBuf);
 642   }
 643
 644   return false;
 645 }