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      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   void BeginSourceFile(const LangOptions &Opts,
    107                        const Preprocessor *PP) override {
    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   void HandleDiagnostic(DiagnosticsEngine::Level level,
    132                         const Diagnostic &Info) override {
    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   std::unique_ptr<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 = std::move(WarnOpts);
    208 
    209   CInvok->getLangOpts()->ObjCARCWeak = HasARCRuntime(origCI);
    210 
    211   return CInvok.release();
    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   std::unique_ptr<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   std::unique_ptr<ASTUnit> Unit(
    267       ASTUnit::LoadFromCompilerInvocationAction(CInvok.release(), 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.setNoFinalizeRemoval(NoFinalizeRemoval);
    314   if (!NoNSAllocReallocError)
    315     Diags->setSeverity(diag::warn_arcmt_nsalloc_realloc, diag::Severity::Error,
    316                        SourceLocation());
    317 
    318   for (unsigned i=0, e = transforms.size(); i != e; ++i)
    319     transforms[i](pass);
    320 
    321   capturedDiags.reportDiagnostics(*Diags);
    322 
    323   DiagClient->EndSourceFile();
    324   errRec.FinishCapture();
    325 
    326   return capturedDiags.hasErrors() || testAct.hasReportedErrors();
    327 }
    328 
    329 //===----------------------------------------------------------------------===//
    330 // applyTransformations.
    331 //===----------------------------------------------------------------------===//
    332 
    333 static bool applyTransforms(CompilerInvocation &origCI,
    334                             const FrontendInputFile &Input,
    335                             DiagnosticConsumer *DiagClient,
    336                             StringRef outputDir,
    337                             bool emitPremigrationARCErrors,
    338                             StringRef plistOut) {
    339   if (!origCI.getLangOpts()->ObjC1)
    340     return false;
    341 
    342   LangOptions::GCMode OrigGCMode = origCI.getLangOpts()->getGC();
    343 
    344   // Make sure checking is successful first.
    345   CompilerInvocation CInvokForCheck(origCI);
    346   if (arcmt::checkForManualIssues(CInvokForCheck, Input, DiagClient,
    347                                   emitPremigrationARCErrors, plistOut))
    348     return true;
    349 
    350   CompilerInvocation CInvok(origCI);
    351   CInvok.getFrontendOpts().Inputs.clear();
    352   CInvok.getFrontendOpts().Inputs.push_back(Input);
    353 
    354   MigrationProcess migration(CInvok, DiagClient, outputDir);
    355   bool NoFinalizeRemoval = origCI.getMigratorOpts().NoFinalizeRemoval;
    356 
    357   std::vector<TransformFn> transforms = arcmt::getAllTransformations(OrigGCMode,
    358                                                                      NoFinalizeRemoval);
    359   assert(!transforms.empty());
    360 
    361   for (unsigned i=0, e = transforms.size(); i != e; ++i) {
    362     bool err = migration.applyTransform(transforms[i]);
    363     if (err) return true;
    364   }
    365 
    366   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
    367   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
    368       new DiagnosticsEngine(DiagID, &origCI.getDiagnosticOpts(),
    369                             DiagClient, /*ShouldOwnClient=*/false));
    370 
    371   if (outputDir.empty()) {
    372     origCI.getLangOpts()->ObjCAutoRefCount = true;
    373     return migration.getRemapper().overwriteOriginal(*Diags);
    374   } else {
    375     return migration.getRemapper().flushToDisk(outputDir, *Diags);
    376   }
    377 }
    378 
    379 bool arcmt::applyTransformations(CompilerInvocation &origCI,
    380                                  const FrontendInputFile &Input,
    381                                  DiagnosticConsumer *DiagClient) {
    382   return applyTransforms(origCI, Input, DiagClient,
    383                          StringRef(), false, StringRef());
    384 }
    385 
    386 bool arcmt::migrateWithTemporaryFiles(CompilerInvocation &origCI,
    387                                       const FrontendInputFile &Input,
    388                                       DiagnosticConsumer *DiagClient,
    389                                       StringRef outputDir,
    390                                       bool emitPremigrationARCErrors,
    391                                       StringRef plistOut) {
    392   assert(!outputDir.empty() && "Expected output directory path");
    393   return applyTransforms(origCI, Input, DiagClient,
    394                          outputDir, emitPremigrationARCErrors, plistOut);
    395 }
    396 
    397 bool arcmt::getFileRemappings(std::vector<std::pair<std::string,std::string> > &
    398                                   remap,
    399                               StringRef outputDir,
    400                               DiagnosticConsumer *DiagClient) {
    401   assert(!outputDir.empty());
    402 
    403   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
    404   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
    405       new DiagnosticsEngine(DiagID, new DiagnosticOptions,
    406                             DiagClient, /*ShouldOwnClient=*/false));
    407 
    408   FileRemapper remapper;
    409   bool err = remapper.initFromDisk(outputDir, *Diags,
    410                                    /*ignoreIfFilesChanged=*/true);
    411   if (err)
    412     return true;
    413 
    414   PreprocessorOptions PPOpts;
    415   remapper.applyMappings(PPOpts);
    416   remap = PPOpts.RemappedFiles;
    417 
    418   return false;
    419 }
    420 
    421 
    422 //===----------------------------------------------------------------------===//
    423 // CollectTransformActions.
    424 //===----------------------------------------------------------------------===//
    425 
    426 namespace {
    427 
    428 class ARCMTMacroTrackerPPCallbacks : public PPCallbacks {
    429   std::vector<SourceLocation> &ARCMTMacroLocs;
    430 
    431 public:
    432   ARCMTMacroTrackerPPCallbacks(std::vector<SourceLocation> &ARCMTMacroLocs)
    433     : ARCMTMacroLocs(ARCMTMacroLocs) { }
    434 
    435   void MacroExpands(const Token &MacroNameTok, const MacroDirective *MD,
    436                     SourceRange Range, const MacroArgs *Args) override {
    437     if (MacroNameTok.getIdentifierInfo()->getName() == getARCMTMacroName())
    438       ARCMTMacroLocs.push_back(MacroNameTok.getLocation());
    439   }
    440 };
    441 
    442 class ARCMTMacroTrackerAction : public ASTFrontendAction {
    443   std::vector<SourceLocation> &ARCMTMacroLocs;
    444 
    445 public:
    446   ARCMTMacroTrackerAction(std::vector<SourceLocation> &ARCMTMacroLocs)
    447     : ARCMTMacroLocs(ARCMTMacroLocs) { }
    448 
    449   ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
    450                                  StringRef InFile) override {
    451     CI.getPreprocessor().addPPCallbacks(
    452                               new ARCMTMacroTrackerPPCallbacks(ARCMTMacroLocs));
    453     return new ASTConsumer();
    454   }
    455 };
    456 
    457 class RewritesApplicator : public TransformActions::RewriteReceiver {
    458   Rewriter &rewriter;
    459   MigrationProcess::RewriteListener *Listener;
    460 
    461 public:
    462   RewritesApplicator(Rewriter &rewriter, ASTContext &ctx,
    463                      MigrationProcess::RewriteListener *listener)
    464     : rewriter(rewriter), Listener(listener) {
    465     if (Listener)
    466       Listener->start(ctx);
    467   }
    468   ~RewritesApplicator() {
    469     if (Listener)
    470       Listener->finish();
    471   }
    472 
    473   void insert(SourceLocation loc, StringRef text) override {
    474     bool err = rewriter.InsertText(loc, text, /*InsertAfter=*/true,
    475                                    /*indentNewLines=*/true);
    476     if (!err && Listener)
    477       Listener->insert(loc, text);
    478   }
    479 
    480   void remove(CharSourceRange range) override {
    481     Rewriter::RewriteOptions removeOpts;
    482     removeOpts.IncludeInsertsAtBeginOfRange = false;
    483     removeOpts.IncludeInsertsAtEndOfRange = false;
    484     removeOpts.RemoveLineIfEmpty = true;
    485 
    486     bool err = rewriter.RemoveText(range, removeOpts);
    487     if (!err && Listener)
    488       Listener->remove(range);
    489   }
    490 
    491   void increaseIndentation(CharSourceRange range,
    492                             SourceLocation parentIndent) override {
    493     rewriter.IncreaseIndentation(range, parentIndent);
    494   }
    495 };
    496 
    497 } // end anonymous namespace.
    498 
    499 /// \brief Anchor for VTable.
    500 MigrationProcess::RewriteListener::~RewriteListener() { }
    501 
    502 MigrationProcess::MigrationProcess(const CompilerInvocation &CI,
    503                                    DiagnosticConsumer *diagClient,
    504                                    StringRef outputDir)
    505   : OrigCI(CI), DiagClient(diagClient), HadARCErrors(false) {
    506   if (!outputDir.empty()) {
    507     IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
    508     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
    509       new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(),
    510                             DiagClient, /*ShouldOwnClient=*/false));
    511     Remapper.initFromDisk(outputDir, *Diags, /*ignoreIfFilesChanges=*/true);
    512   }
    513 }
    514 
    515 bool MigrationProcess::applyTransform(TransformFn trans,
    516                                       RewriteListener *listener) {
    517   std::unique_ptr<CompilerInvocation> CInvok;
    518   CInvok.reset(createInvocationForMigration(OrigCI));
    519   CInvok->getDiagnosticOpts().IgnoreWarnings = true;
    520 
    521   Remapper.applyMappings(CInvok->getPreprocessorOpts());
    522 
    523   CapturedDiagList capturedDiags;
    524   std::vector<SourceLocation> ARCMTMacroLocs;
    525 
    526   assert(DiagClient);
    527   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
    528   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
    529       new DiagnosticsEngine(DiagID, new DiagnosticOptions,
    530                             DiagClient, /*ShouldOwnClient=*/false));
    531 
    532   // Filter of all diagnostics.
    533   CaptureDiagnosticConsumer errRec(*Diags, *DiagClient, capturedDiags);
    534   Diags->setClient(&errRec, /*ShouldOwnClient=*/false);
    535 
    536   std::unique_ptr<ARCMTMacroTrackerAction> ASTAction;
    537   ASTAction.reset(new ARCMTMacroTrackerAction(ARCMTMacroLocs));
    538 
    539   std::unique_ptr<ASTUnit> Unit(ASTUnit::LoadFromCompilerInvocationAction(
    540       CInvok.release(), Diags, ASTAction.get()));
    541   if (!Unit) {
    542     errRec.FinishCapture();
    543     return true;
    544   }
    545   Unit->setOwnsRemappedFileBuffers(false); // FileRemapper manages that.
    546 
    547   HadARCErrors = HadARCErrors || capturedDiags.hasErrors();
    548 
    549   // Don't filter diagnostics anymore.
    550   Diags->setClient(DiagClient, /*ShouldOwnClient=*/false);
    551 
    552   ASTContext &Ctx = Unit->getASTContext();
    553 
    554   if (Diags->hasFatalErrorOccurred()) {
    555     Diags->Reset();
    556     DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
    557     capturedDiags.reportDiagnostics(*Diags);
    558     DiagClient->EndSourceFile();
    559     errRec.FinishCapture();
    560     return true;
    561   }
    562 
    563   // After parsing of source files ended, we want to reuse the
    564   // diagnostics objects to emit further diagnostics.
    565   // We call BeginSourceFile because DiagnosticConsumer requires that
    566   // diagnostics with source range information are emitted only in between
    567   // BeginSourceFile() and EndSourceFile().
    568   DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
    569 
    570   Rewriter rewriter(Ctx.getSourceManager(), Ctx.getLangOpts());
    571   TransformActions TA(*Diags, capturedDiags, Ctx, Unit->getPreprocessor());
    572   MigrationPass pass(Ctx, OrigCI.getLangOpts()->getGC(),
    573                      Unit->getSema(), TA, capturedDiags, ARCMTMacroLocs);
    574 
    575   trans(pass);
    576 
    577   {
    578     RewritesApplicator applicator(rewriter, Ctx, listener);
    579     TA.applyRewrites(applicator);
    580   }
    581 
    582   DiagClient->EndSourceFile();
    583   errRec.FinishCapture();
    584 
    585   if (DiagClient->getNumErrors())
    586     return true;
    587 
    588   for (Rewriter::buffer_iterator
    589         I = rewriter.buffer_begin(), E = rewriter.buffer_end(); I != E; ++I) {
    590     FileID FID = I->first;
    591     RewriteBuffer &buf = I->second;
    592     const FileEntry *file = Ctx.getSourceManager().getFileEntryForID(FID);
    593     assert(file);
    594     std::string newFname = file->getName();
    595     newFname += "-trans";
    596     SmallString<512> newText;
    597     llvm::raw_svector_ostream vecOS(newText);
    598     buf.write(vecOS);
    599     vecOS.flush();
    600     llvm::MemoryBuffer *memBuf = llvm::MemoryBuffer::getMemBufferCopy(
    601                    StringRef(newText.data(), newText.size()), newFname);
    602     SmallString<64> filePath(file->getName());
    603     Unit->getFileManager().FixupRelativePath(filePath);
    604     Remapper.remap(filePath.str(), memBuf);
    605   }
    606 
    607   return false;
    608 }
    609