ARCMT.cpp revision 251662 
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.getOS() == llvm::Triple::IOS)
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  // If we are migrating code that gets the '-fobjc-arc' flag, make sure
325  // to remove it so that we don't get errors from normal compilation.
326  origCI.getLangOpts()->ObjCAutoRefCount = false;
327
328  return capturedDiags.hasErrors() || testAct.hasReportedErrors();
329}
330
331//===----------------------------------------------------------------------===//
332// applyTransformations.
333//===----------------------------------------------------------------------===//
334
335static bool applyTransforms(CompilerInvocation &origCI,
336                            const FrontendInputFile &Input,
337                            DiagnosticConsumer *DiagClient,
338                            StringRef outputDir,
339                            bool emitPremigrationARCErrors,
340                            StringRef plistOut) {
341  if (!origCI.getLangOpts()->ObjC1)
342    return false;
343
344  LangOptions::GCMode OrigGCMode = origCI.getLangOpts()->getGC();
345
346  // Make sure checking is successful first.
347  CompilerInvocation CInvokForCheck(origCI);
348  if (arcmt::checkForManualIssues(CInvokForCheck, Input, DiagClient,
349                                  emitPremigrationARCErrors, plistOut))
350    return true;
351
352  CompilerInvocation CInvok(origCI);
353  CInvok.getFrontendOpts().Inputs.clear();
354  CInvok.getFrontendOpts().Inputs.push_back(Input);
355
356  MigrationProcess migration(CInvok, DiagClient, outputDir);
357  bool NoFinalizeRemoval = origCI.getMigratorOpts().NoFinalizeRemoval;
358
359  std::vector<TransformFn> transforms = arcmt::getAllTransformations(OrigGCMode,
360                                                                     NoFinalizeRemoval);
361  assert(!transforms.empty());
362
363  for (unsigned i=0, e = transforms.size(); i != e; ++i) {
364    bool err = migration.applyTransform(transforms[i]);
365    if (err) return true;
366  }
367
368  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
369  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
370      new DiagnosticsEngine(DiagID, &origCI.getDiagnosticOpts(),
371                            DiagClient, /*ShouldOwnClient=*/false));
372
373  if (outputDir.empty()) {
374    origCI.getLangOpts()->ObjCAutoRefCount = true;
375    return migration.getRemapper().overwriteOriginal(*Diags);
376  } else {
377    // If we are migrating code that gets the '-fobjc-arc' flag, make sure
378    // to remove it so that we don't get errors from normal compilation.
379    origCI.getLangOpts()->ObjCAutoRefCount = false;
380    return migration.getRemapper().flushToDisk(outputDir, *Diags);
381  }
382}
383
384bool arcmt::applyTransformations(CompilerInvocation &origCI,
385                                 const FrontendInputFile &Input,
386                                 DiagnosticConsumer *DiagClient) {
387  return applyTransforms(origCI, Input, DiagClient,
388                         StringRef(), false, StringRef());
389}
390
391bool arcmt::migrateWithTemporaryFiles(CompilerInvocation &origCI,
392                                      const FrontendInputFile &Input,
393                                      DiagnosticConsumer *DiagClient,
394                                      StringRef outputDir,
395                                      bool emitPremigrationARCErrors,
396                                      StringRef plistOut) {
397  assert(!outputDir.empty() && "Expected output directory path");
398  return applyTransforms(origCI, Input, DiagClient,
399                         outputDir, emitPremigrationARCErrors, plistOut);
400}
401
402bool arcmt::getFileRemappings(std::vector<std::pair<std::string,std::string> > &
403                                  remap,
404                              StringRef outputDir,
405                              DiagnosticConsumer *DiagClient) {
406  assert(!outputDir.empty());
407
408  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
409  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
410      new DiagnosticsEngine(DiagID, new DiagnosticOptions,
411                            DiagClient, /*ShouldOwnClient=*/false));
412
413  FileRemapper remapper;
414  bool err = remapper.initFromDisk(outputDir, *Diags,
415                                   /*ignoreIfFilesChanged=*/true);
416  if (err)
417    return true;
418
419  PreprocessorOptions PPOpts;
420  remapper.applyMappings(PPOpts);
421  remap = PPOpts.RemappedFiles;
422
423  return false;
424}
425
426bool arcmt::getFileRemappingsFromFileList(
427                        std::vector<std::pair<std::string,std::string> > &remap,
428                        ArrayRef<StringRef> remapFiles,
429                        DiagnosticConsumer *DiagClient) {
430  bool hasErrorOccurred = false;
431  llvm::StringMap<bool> Uniquer;
432
433  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
434  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
435      new DiagnosticsEngine(DiagID, new DiagnosticOptions,
436                            DiagClient, /*ShouldOwnClient=*/false));
437
438  for (ArrayRef<StringRef>::iterator
439         I = remapFiles.begin(), E = remapFiles.end(); I != E; ++I) {
440    StringRef file = *I;
441
442    FileRemapper remapper;
443    bool err = remapper.initFromFile(file, *Diags,
444                                     /*ignoreIfFilesChanged=*/true);
445    hasErrorOccurred = hasErrorOccurred || err;
446    if (err)
447      continue;
448
449    PreprocessorOptions PPOpts;
450    remapper.applyMappings(PPOpts);
451    for (PreprocessorOptions::remapped_file_iterator
452           RI = PPOpts.remapped_file_begin(), RE = PPOpts.remapped_file_end();
453           RI != RE; ++RI) {
454      bool &inserted = Uniquer[RI->first];
455      if (inserted)
456        continue;
457      inserted = true;
458      remap.push_back(*RI);
459    }
460  }
461
462  return hasErrorOccurred;
463}
464
465//===----------------------------------------------------------------------===//
466// CollectTransformActions.
467//===----------------------------------------------------------------------===//
468
469namespace {
470
471class ARCMTMacroTrackerPPCallbacks : public PPCallbacks {
472  std::vector<SourceLocation> &ARCMTMacroLocs;
473
474public:
475  ARCMTMacroTrackerPPCallbacks(std::vector<SourceLocation> &ARCMTMacroLocs)
476    : ARCMTMacroLocs(ARCMTMacroLocs) { }
477
478  virtual void MacroExpands(const Token &MacroNameTok, const MacroDirective *MD,
479                            SourceRange Range, const MacroArgs *Args) {
480    if (MacroNameTok.getIdentifierInfo()->getName() == getARCMTMacroName())
481      ARCMTMacroLocs.push_back(MacroNameTok.getLocation());
482  }
483};
484
485class ARCMTMacroTrackerAction : public ASTFrontendAction {
486  std::vector<SourceLocation> &ARCMTMacroLocs;
487
488public:
489  ARCMTMacroTrackerAction(std::vector<SourceLocation> &ARCMTMacroLocs)
490    : ARCMTMacroLocs(ARCMTMacroLocs) { }
491
492  virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
493                                         StringRef InFile) {
494    CI.getPreprocessor().addPPCallbacks(
495                              new ARCMTMacroTrackerPPCallbacks(ARCMTMacroLocs));
496    return new ASTConsumer();
497  }
498};
499
500class RewritesApplicator : public TransformActions::RewriteReceiver {
501  Rewriter &rewriter;
502  MigrationProcess::RewriteListener *Listener;
503
504public:
505  RewritesApplicator(Rewriter &rewriter, ASTContext &ctx,
506                     MigrationProcess::RewriteListener *listener)
507    : rewriter(rewriter), Listener(listener) {
508    if (Listener)
509      Listener->start(ctx);
510  }
511  ~RewritesApplicator() {
512    if (Listener)
513      Listener->finish();
514  }
515
516  virtual void insert(SourceLocation loc, StringRef text) {
517    bool err = rewriter.InsertText(loc, text, /*InsertAfter=*/true,
518                                   /*indentNewLines=*/true);
519    if (!err && Listener)
520      Listener->insert(loc, text);
521  }
522
523  virtual void remove(CharSourceRange range) {
524    Rewriter::RewriteOptions removeOpts;
525    removeOpts.IncludeInsertsAtBeginOfRange = false;
526    removeOpts.IncludeInsertsAtEndOfRange = false;
527    removeOpts.RemoveLineIfEmpty = true;
528
529    bool err = rewriter.RemoveText(range, removeOpts);
530    if (!err && Listener)
531      Listener->remove(range);
532  }
533
534  virtual void increaseIndentation(CharSourceRange range,
535                                    SourceLocation parentIndent) {
536    rewriter.IncreaseIndentation(range, parentIndent);
537  }
538};
539
540} // end anonymous namespace.
541
542/// \brief Anchor for VTable.
543MigrationProcess::RewriteListener::~RewriteListener() { }
544
545MigrationProcess::MigrationProcess(const CompilerInvocation &CI,
546                                   DiagnosticConsumer *diagClient,
547                                   StringRef outputDir)
548  : OrigCI(CI), DiagClient(diagClient) {
549  if (!outputDir.empty()) {
550    IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
551    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
552      new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(),
553                            DiagClient, /*ShouldOwnClient=*/false));
554    Remapper.initFromDisk(outputDir, *Diags, /*ignoreIfFilesChanges=*/true);
555  }
556}
557
558bool MigrationProcess::applyTransform(TransformFn trans,
559                                      RewriteListener *listener) {
560  OwningPtr<CompilerInvocation> CInvok;
561  CInvok.reset(createInvocationForMigration(OrigCI));
562  CInvok->getDiagnosticOpts().IgnoreWarnings = true;
563
564  Remapper.applyMappings(CInvok->getPreprocessorOpts());
565
566  CapturedDiagList capturedDiags;
567  std::vector<SourceLocation> ARCMTMacroLocs;
568
569  assert(DiagClient);
570  IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
571  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
572      new DiagnosticsEngine(DiagID, new DiagnosticOptions,
573                            DiagClient, /*ShouldOwnClient=*/false));
574
575  // Filter of all diagnostics.
576  CaptureDiagnosticConsumer errRec(*Diags, *DiagClient, capturedDiags);
577  Diags->setClient(&errRec, /*ShouldOwnClient=*/false);
578
579  OwningPtr<ARCMTMacroTrackerAction> ASTAction;
580  ASTAction.reset(new ARCMTMacroTrackerAction(ARCMTMacroLocs));
581
582  OwningPtr<ASTUnit> Unit(
583      ASTUnit::LoadFromCompilerInvocationAction(CInvok.take(), Diags,
584                                                ASTAction.get()));
585  if (!Unit) {
586    errRec.FinishCapture();
587    return true;
588  }
589  Unit->setOwnsRemappedFileBuffers(false); // FileRemapper manages that.
590
591  // Don't filter diagnostics anymore.
592  Diags->setClient(DiagClient, /*ShouldOwnClient=*/false);
593
594  ASTContext &Ctx = Unit->getASTContext();
595
596  if (Diags->hasFatalErrorOccurred()) {
597    Diags->Reset();
598    DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
599    capturedDiags.reportDiagnostics(*Diags);
600    DiagClient->EndSourceFile();
601    errRec.FinishCapture();
602    return true;
603  }
604
605  // After parsing of source files ended, we want to reuse the
606  // diagnostics objects to emit further diagnostics.
607  // We call BeginSourceFile because DiagnosticConsumer requires that
608  // diagnostics with source range information are emitted only in between
609  // BeginSourceFile() and EndSourceFile().
610  DiagClient->BeginSourceFile(Ctx.getLangOpts(), &Unit->getPreprocessor());
611
612  Rewriter rewriter(Ctx.getSourceManager(), Ctx.getLangOpts());
613  TransformActions TA(*Diags, capturedDiags, Ctx, Unit->getPreprocessor());
614  MigrationPass pass(Ctx, OrigCI.getLangOpts()->getGC(),
615                     Unit->getSema(), TA, capturedDiags, ARCMTMacroLocs);
616
617  trans(pass);
618
619  {
620    RewritesApplicator applicator(rewriter, Ctx, listener);
621    TA.applyRewrites(applicator);
622  }
623
624  DiagClient->EndSourceFile();
625  errRec.FinishCapture();
626
627  if (DiagClient->getNumErrors())
628    return true;
629
630  for (Rewriter::buffer_iterator
631        I = rewriter.buffer_begin(), E = rewriter.buffer_end(); I != E; ++I) {
632    FileID FID = I->first;
633    RewriteBuffer &buf = I->second;
634    const FileEntry *file = Ctx.getSourceManager().getFileEntryForID(FID);
635    assert(file);
636    std::string newFname = file->getName();
637    newFname += "-trans";
638    SmallString<512> newText;
639    llvm::raw_svector_ostream vecOS(newText);
640    buf.write(vecOS);
641    vecOS.flush();
642    llvm::MemoryBuffer *memBuf = llvm::MemoryBuffer::getMemBufferCopy(
643                   StringRef(newText.data(), newText.size()), newFname);
644    SmallString<64> filePath(file->getName());
645    Unit->getFileManager().FixupRelativePath(filePath);
646    Remapper.remap(filePath.str(), memBuf);
647  }
648
649  return false;
650}
651