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"
24using namespace clang;
25using namespace arcmt;
26
27bool 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
57bool 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
79void 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
84bool 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
92namespace {
93
94class CaptureDiagnosticConsumer : public DiagnosticConsumer {
95  DiagnosticsEngine &Diags;
96  DiagnosticConsumer &DiagClient;
97  CapturedDiagList &CapturedDiags;
98  bool HasBegunSourceFile;
99public:
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
147static 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
168static CompilerInvocation *
169createInvocationForMigration(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
214static 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
233bool 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
331static 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
377bool arcmt::applyTransformations(CompilerInvocation &origCI,
378                                 const FrontendInputFile &Input,
379                                 DiagnosticConsumer *DiagClient) {
380  return applyTransforms(origCI, Input, DiagClient,
381                         StringRef(), false, StringRef());
382}
383
384bool 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
395bool 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
419bool 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
462namespace {
463
464class ARCMTMacroTrackerPPCallbacks : public PPCallbacks {
465  std::vector<SourceLocation> &ARCMTMacroLocs;
466
467public:
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
478class ARCMTMacroTrackerAction : public ASTFrontendAction {
479  std::vector<SourceLocation> &ARCMTMacroLocs;
480
481public:
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
493class RewritesApplicator : public TransformActions::RewriteReceiver {
494  Rewriter &rewriter;
495  MigrationProcess::RewriteListener *Listener;
496
497public:
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.
536MigrationProcess::RewriteListener::~RewriteListener() { }
537
538MigrationProcess::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
551bool 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}
646