1 //===--- ObjCMT.cpp - ObjC Migrate Tool -----------------------------------===//
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 "Transforms.h"
11 #include "clang/ARCMigrate/ARCMTActions.h"
12 #include "clang/AST/ASTConsumer.h"
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/NSAPI.h"
15 #include "clang/AST/ParentMap.h"
16 #include "clang/AST/RecursiveASTVisitor.h"
17 #include "clang/Basic/FileManager.h"
18 #include "clang/Edit/Commit.h"
19 #include "clang/Edit/EditedSource.h"
20 #include "clang/Edit/EditsReceiver.h"
21 #include "clang/Edit/Rewriters.h"
22 #include "clang/Frontend/CompilerInstance.h"
23 #include "clang/Frontend/MultiplexConsumer.h"
24 #include "clang/Lex/PPConditionalDirectiveRecord.h"
25 #include "clang/Lex/Preprocessor.h"
26 #include "clang/Rewrite/Core/Rewriter.h"
27 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
28 #include "clang/StaticAnalyzer/Checkers/ObjCRetainCount.h"
29 #include "clang/AST/Attr.h"
30 #include "llvm/ADT/SmallString.h"
31 
32 using namespace clang;
33 using namespace arcmt;
34 using namespace ento::objc_retain;
35 
36 namespace {
37 
38 class ObjCMigrateASTConsumer : public ASTConsumer {
39   enum CF_BRIDGING_KIND {
40     CF_BRIDGING_NONE,
41     CF_BRIDGING_ENABLE,
42     CF_BRIDGING_MAY_INCLUDE
43   };
44 
45   void migrateDecl(Decl *D);
46   void migrateObjCInterfaceDecl(ASTContext &Ctx, ObjCContainerDecl *D);
47   void migrateProtocolConformance(ASTContext &Ctx,
48                                   const ObjCImplementationDecl *ImpDecl);
49   void CacheObjCNSIntegerTypedefed(const TypedefDecl *TypedefDcl);
50   bool migrateNSEnumDecl(ASTContext &Ctx, const EnumDecl *EnumDcl,
51                      const TypedefDecl *TypedefDcl);
52   void migrateAllMethodInstaceType(ASTContext &Ctx, ObjCContainerDecl *CDecl);
53   void migrateMethodInstanceType(ASTContext &Ctx, ObjCContainerDecl *CDecl,
54                                  ObjCMethodDecl *OM);
55   bool migrateProperty(ASTContext &Ctx, ObjCContainerDecl *D, ObjCMethodDecl *OM);
56   void migrateNsReturnsInnerPointer(ASTContext &Ctx, ObjCMethodDecl *OM);
57   void migratePropertyNsReturnsInnerPointer(ASTContext &Ctx, ObjCPropertyDecl *P);
58   void migrateFactoryMethod(ASTContext &Ctx, ObjCContainerDecl *CDecl,
59                             ObjCMethodDecl *OM,
60                             ObjCInstanceTypeFamily OIT_Family = OIT_None);
61 
62   void migrateCFAnnotation(ASTContext &Ctx, const Decl *Decl);
63   void AddCFAnnotations(ASTContext &Ctx, const CallEffects &CE,
64                         const FunctionDecl *FuncDecl, bool ResultAnnotated);
65   void AddCFAnnotations(ASTContext &Ctx, const CallEffects &CE,
66                         const ObjCMethodDecl *MethodDecl, bool ResultAnnotated);
67 
68   void AnnotateImplicitBridging(ASTContext &Ctx);
69 
70   CF_BRIDGING_KIND migrateAddFunctionAnnotation(ASTContext &Ctx,
71                                                 const FunctionDecl *FuncDecl);
72 
73   void migrateARCSafeAnnotation(ASTContext &Ctx, ObjCContainerDecl *CDecl);
74 
75   void migrateAddMethodAnnotation(ASTContext &Ctx,
76                                   const ObjCMethodDecl *MethodDecl);
77 public:
78   std::string MigrateDir;
79   unsigned ASTMigrateActions;
80   unsigned  FileId;
81   const TypedefDecl *NSIntegerTypedefed;
82   const TypedefDecl *NSUIntegerTypedefed;
83   OwningPtr<NSAPI> NSAPIObj;
84   OwningPtr<edit::EditedSource> Editor;
85   FileRemapper &Remapper;
86   FileManager &FileMgr;
87   const PPConditionalDirectiveRecord *PPRec;
88   Preprocessor &PP;
89   bool IsOutputFile;
90   llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ObjCProtocolDecls;
91   llvm::SmallVector<const Decl *, 8> CFFunctionIBCandidates;
92 
93   ObjCMigrateASTConsumer(StringRef migrateDir,
94                          unsigned astMigrateActions,
95                          FileRemapper &remapper,
96                          FileManager &fileMgr,
97                          const PPConditionalDirectiveRecord *PPRec,
98                          Preprocessor &PP,
99                          bool isOutputFile = false)
100   : MigrateDir(migrateDir),
101     ASTMigrateActions(astMigrateActions),
102     FileId(0), NSIntegerTypedefed(0), NSUIntegerTypedefed(0),
103     Remapper(remapper), FileMgr(fileMgr), PPRec(PPRec), PP(PP),
104     IsOutputFile(isOutputFile) { }
105 
106 protected:
107   virtual void Initialize(ASTContext &Context) {
108     NSAPIObj.reset(new NSAPI(Context));
109     Editor.reset(new edit::EditedSource(Context.getSourceManager(),
110                                         Context.getLangOpts(),
111                                         PPRec, false));
112   }
113 
114   virtual bool HandleTopLevelDecl(DeclGroupRef DG) {
115     for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
116       migrateDecl(*I);
117     return true;
118   }
119   virtual void HandleInterestingDecl(DeclGroupRef DG) {
120     // Ignore decls from the PCH.
121   }
122   virtual void HandleTopLevelDeclInObjCContainer(DeclGroupRef DG) {
123     ObjCMigrateASTConsumer::HandleTopLevelDecl(DG);
124   }
125 
126   virtual void HandleTranslationUnit(ASTContext &Ctx);
127 };
128 
129 }
130 
131 ObjCMigrateAction::ObjCMigrateAction(FrontendAction *WrappedAction,
132                                      StringRef migrateDir,
133                                      unsigned migrateAction)
134   : WrapperFrontendAction(WrappedAction), MigrateDir(migrateDir),
135     ObjCMigAction(migrateAction),
136     CompInst(0) {
137   if (MigrateDir.empty())
138     MigrateDir = "."; // user current directory if none is given.
139 }
140 
141 ASTConsumer *ObjCMigrateAction::CreateASTConsumer(CompilerInstance &CI,
142                                                   StringRef InFile) {
143   PPConditionalDirectiveRecord *
144     PPRec = new PPConditionalDirectiveRecord(CompInst->getSourceManager());
145   CompInst->getPreprocessor().addPPCallbacks(PPRec);
146   ASTConsumer *
147     WrappedConsumer = WrapperFrontendAction::CreateASTConsumer(CI, InFile);
148   ASTConsumer *MTConsumer = new ObjCMigrateASTConsumer(MigrateDir,
149                                                        ObjCMigAction,
150                                                        Remapper,
151                                                     CompInst->getFileManager(),
152                                                        PPRec,
153                                                        CompInst->getPreprocessor());
154   ASTConsumer *Consumers[] = { MTConsumer, WrappedConsumer };
155   return new MultiplexConsumer(Consumers);
156 }
157 
158 bool ObjCMigrateAction::BeginInvocation(CompilerInstance &CI) {
159   Remapper.initFromDisk(MigrateDir, CI.getDiagnostics(),
160                         /*ignoreIfFilesChanges=*/true);
161   CompInst = &CI;
162   CI.getDiagnostics().setIgnoreAllWarnings(true);
163   return true;
164 }
165 
166 namespace {
167 class ObjCMigrator : public RecursiveASTVisitor<ObjCMigrator> {
168   ObjCMigrateASTConsumer &Consumer;
169   ParentMap &PMap;
170 
171 public:
172   ObjCMigrator(ObjCMigrateASTConsumer &consumer, ParentMap &PMap)
173     : Consumer(consumer), PMap(PMap) { }
174 
175   bool shouldVisitTemplateInstantiations() const { return false; }
176   bool shouldWalkTypesOfTypeLocs() const { return false; }
177 
178   bool VisitObjCMessageExpr(ObjCMessageExpr *E) {
179     if (Consumer.ASTMigrateActions & FrontendOptions::ObjCMT_Literals) {
180       edit::Commit commit(*Consumer.Editor);
181       edit::rewriteToObjCLiteralSyntax(E, *Consumer.NSAPIObj, commit, &PMap);
182       Consumer.Editor->commit(commit);
183     }
184 
185     if (Consumer.ASTMigrateActions & FrontendOptions::ObjCMT_Subscripting) {
186       edit::Commit commit(*Consumer.Editor);
187       edit::rewriteToObjCSubscriptSyntax(E, *Consumer.NSAPIObj, commit);
188       Consumer.Editor->commit(commit);
189     }
190 
191     return true;
192   }
193 
194   bool TraverseObjCMessageExpr(ObjCMessageExpr *E) {
195     // Do depth first; we want to rewrite the subexpressions first so that if
196     // we have to move expressions we will move them already rewritten.
197     for (Stmt::child_range range = E->children(); range; ++range)
198       if (!TraverseStmt(*range))
199         return false;
200 
201     return WalkUpFromObjCMessageExpr(E);
202   }
203 };
204 
205 class BodyMigrator : public RecursiveASTVisitor<BodyMigrator> {
206   ObjCMigrateASTConsumer &Consumer;
207   OwningPtr<ParentMap> PMap;
208 
209 public:
210   BodyMigrator(ObjCMigrateASTConsumer &consumer) : Consumer(consumer) { }
211 
212   bool shouldVisitTemplateInstantiations() const { return false; }
213   bool shouldWalkTypesOfTypeLocs() const { return false; }
214 
215   bool TraverseStmt(Stmt *S) {
216     PMap.reset(new ParentMap(S));
217     ObjCMigrator(Consumer, *PMap).TraverseStmt(S);
218     return true;
219   }
220 };
221 }
222 
223 void ObjCMigrateASTConsumer::migrateDecl(Decl *D) {
224   if (!D)
225     return;
226   if (isa<ObjCMethodDecl>(D))
227     return; // Wait for the ObjC container declaration.
228 
229   BodyMigrator(*this).TraverseDecl(D);
230 }
231 
232 static void append_attr(std::string &PropertyString, const char *attr,
233                         bool &LParenAdded) {
234   if (!LParenAdded) {
235     PropertyString += "(";
236     LParenAdded = true;
237   }
238   else
239     PropertyString += ", ";
240   PropertyString += attr;
241 }
242 
243 static
244 void MigrateBlockOrFunctionPointerTypeVariable(std::string & PropertyString,
245                                                const std::string& TypeString,
246                                                const char *name) {
247   const char *argPtr = TypeString.c_str();
248   int paren = 0;
249   while (*argPtr) {
250     switch (*argPtr) {
251       case '(':
252         PropertyString += *argPtr;
253         paren++;
254         break;
255       case ')':
256         PropertyString += *argPtr;
257         paren--;
258         break;
259       case '^':
260       case '*':
261         PropertyString += (*argPtr);
262         if (paren == 1) {
263           PropertyString += name;
264           name = "";
265         }
266         break;
267       default:
268         PropertyString += *argPtr;
269         break;
270     }
271     argPtr++;
272   }
273 }
274 
275 
276 static void rewriteToObjCProperty(const ObjCMethodDecl *Getter,
277                                   const ObjCMethodDecl *Setter,
278                                   const NSAPI &NS, edit::Commit &commit,
279                                   unsigned LengthOfPrefix,
280                                   bool Atomic) {
281   ASTContext &Context = NS.getASTContext();
282   bool LParenAdded = false;
283   std::string PropertyString = "@property ";
284   if (!Atomic) {
285     PropertyString += "(nonatomic";
286     LParenAdded = true;
287   }
288 
289   std::string PropertyNameString = Getter->getNameAsString();
290   StringRef PropertyName(PropertyNameString);
291   if (LengthOfPrefix > 0) {
292     if (!LParenAdded) {
293       PropertyString += "(getter=";
294       LParenAdded = true;
295     }
296     else
297       PropertyString += ", getter=";
298     PropertyString += PropertyNameString;
299   }
300   // Property with no setter may be suggested as a 'readonly' property.
301   if (!Setter) {
302     if (!LParenAdded) {
303       PropertyString += "(readonly";
304       LParenAdded = true;
305     }
306     else
307       append_attr(PropertyString, "readonly", LParenAdded);
308   }
309 
310   // Short circuit 'delegate' properties that contain the name "delegate" or
311   // "dataSource", or have exact name "target" to have 'assign' attribute.
312   if (PropertyName.equals("target") ||
313       (PropertyName.find("delegate") != StringRef::npos) ||
314       (PropertyName.find("dataSource") != StringRef::npos)) {
315     QualType QT = Getter->getResultType();
316     if (!QT->isRealType())
317       append_attr(PropertyString, "assign", LParenAdded);
318   }
319   else if (Setter) {
320     const ParmVarDecl *argDecl = *Setter->param_begin();
321     QualType ArgType = Context.getCanonicalType(argDecl->getType());
322     Qualifiers::ObjCLifetime propertyLifetime = ArgType.getObjCLifetime();
323     bool RetainableObject = ArgType->isObjCRetainableType();
324     if (RetainableObject && propertyLifetime == Qualifiers::OCL_Strong) {
325       if (const ObjCObjectPointerType *ObjPtrTy =
326           ArgType->getAs<ObjCObjectPointerType>()) {
327         ObjCInterfaceDecl *IDecl = ObjPtrTy->getObjectType()->getInterface();
328         if (IDecl &&
329             IDecl->lookupNestedProtocol(&Context.Idents.get("NSCopying")))
330           append_attr(PropertyString, "copy", LParenAdded);
331         else
332           append_attr(PropertyString, "retain", LParenAdded);
333       }
334       else if (ArgType->isBlockPointerType())
335         append_attr(PropertyString, "copy", LParenAdded);
336     } else if (propertyLifetime == Qualifiers::OCL_Weak)
337       // TODO. More precise determination of 'weak' attribute requires
338       // looking into setter's implementation for backing weak ivar.
339       append_attr(PropertyString, "weak", LParenAdded);
340     else if (RetainableObject)
341       append_attr(PropertyString,
342                   ArgType->isBlockPointerType() ? "copy" : "retain", LParenAdded);
343   }
344   if (LParenAdded)
345     PropertyString += ')';
346   QualType RT = Getter->getResultType();
347   if (!isa<TypedefType>(RT)) {
348     // strip off any ARC lifetime qualifier.
349     QualType CanResultTy = Context.getCanonicalType(RT);
350     if (CanResultTy.getQualifiers().hasObjCLifetime()) {
351       Qualifiers Qs = CanResultTy.getQualifiers();
352       Qs.removeObjCLifetime();
353       RT = Context.getQualifiedType(CanResultTy.getUnqualifiedType(), Qs);
354     }
355   }
356   PropertyString += " ";
357   PrintingPolicy SubPolicy(Context.getPrintingPolicy());
358   SubPolicy.SuppressStrongLifetime = true;
359   SubPolicy.SuppressLifetimeQualifiers = true;
360   std::string TypeString = RT.getAsString(SubPolicy);
361   if (LengthOfPrefix > 0) {
362     // property name must strip off "is" and lower case the first character
363     // after that; e.g. isContinuous will become continuous.
364     StringRef PropertyNameStringRef(PropertyNameString);
365     PropertyNameStringRef = PropertyNameStringRef.drop_front(LengthOfPrefix);
366     PropertyNameString = PropertyNameStringRef;
367     bool NoLowering = (isUppercase(PropertyNameString[0]) &&
368                        PropertyNameString.size() > 1 &&
369                        isUppercase(PropertyNameString[1]));
370     if (!NoLowering)
371       PropertyNameString[0] = toLowercase(PropertyNameString[0]);
372   }
373   if (RT->isBlockPointerType() || RT->isFunctionPointerType())
374     MigrateBlockOrFunctionPointerTypeVariable(PropertyString,
375                                               TypeString,
376                                               PropertyNameString.c_str());
377   else {
378     char LastChar = TypeString[TypeString.size()-1];
379     PropertyString += TypeString;
380     if (LastChar != '*')
381       PropertyString += ' ';
382     PropertyString += PropertyNameString;
383   }
384   SourceLocation StartGetterSelectorLoc = Getter->getSelectorStartLoc();
385   Selector GetterSelector = Getter->getSelector();
386 
387   SourceLocation EndGetterSelectorLoc =
388     StartGetterSelectorLoc.getLocWithOffset(GetterSelector.getNameForSlot(0).size());
389   commit.replace(CharSourceRange::getCharRange(Getter->getLocStart(),
390                                                EndGetterSelectorLoc),
391                  PropertyString);
392   if (Setter) {
393     SourceLocation EndLoc = Setter->getDeclaratorEndLoc();
394     // Get location past ';'
395     EndLoc = EndLoc.getLocWithOffset(1);
396     SourceLocation BeginOfSetterDclLoc = Setter->getLocStart();
397     // FIXME. This assumes that setter decl; is immediately preceeded by eoln.
398     // It is trying to remove the setter method decl. line entirely.
399     BeginOfSetterDclLoc = BeginOfSetterDclLoc.getLocWithOffset(-1);
400     commit.remove(SourceRange(BeginOfSetterDclLoc, EndLoc));
401   }
402 }
403 
404 void ObjCMigrateASTConsumer::migrateObjCInterfaceDecl(ASTContext &Ctx,
405                                                       ObjCContainerDecl *D) {
406   if (D->isDeprecated())
407     return;
408 
409   for (ObjCContainerDecl::method_iterator M = D->meth_begin(), MEnd = D->meth_end();
410        M != MEnd; ++M) {
411     ObjCMethodDecl *Method = (*M);
412     if (Method->isDeprecated())
413       continue;
414     migrateProperty(Ctx, D, Method);
415     if (ASTMigrateActions & FrontendOptions::ObjCMT_Annotation)
416       migrateNsReturnsInnerPointer(Ctx, Method);
417   }
418   for (ObjCContainerDecl::prop_iterator P = D->prop_begin(),
419        E = D->prop_end(); P != E; ++P) {
420     ObjCPropertyDecl *Prop = *P;
421     if ((ASTMigrateActions & FrontendOptions::ObjCMT_Annotation) &&
422         !P->isDeprecated())
423       migratePropertyNsReturnsInnerPointer(Ctx, Prop);
424   }
425 }
426 
427 static bool
428 ClassImplementsAllMethodsAndProperties(ASTContext &Ctx,
429                                       const ObjCImplementationDecl *ImpDecl,
430                                        const ObjCInterfaceDecl *IDecl,
431                                       ObjCProtocolDecl *Protocol) {
432   // In auto-synthesis, protocol properties are not synthesized. So,
433   // a conforming protocol must have its required properties declared
434   // in class interface.
435   bool HasAtleastOneRequiredProperty = false;
436   if (const ObjCProtocolDecl *PDecl = Protocol->getDefinition())
437     for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
438          E = PDecl->prop_end(); P != E; ++P) {
439       ObjCPropertyDecl *Property = *P;
440       if (Property->getPropertyImplementation() == ObjCPropertyDecl::Optional)
441         continue;
442       HasAtleastOneRequiredProperty = true;
443       DeclContext::lookup_const_result R = IDecl->lookup(Property->getDeclName());
444       if (R.size() == 0) {
445         // Relax the rule and look into class's implementation for a synthesize
446         // or dynamic declaration. Class is implementing a property coming from
447         // another protocol. This still makes the target protocol as conforming.
448         if (!ImpDecl->FindPropertyImplDecl(
449                                   Property->getDeclName().getAsIdentifierInfo()))
450           return false;
451       }
452       else if (ObjCPropertyDecl *ClassProperty = dyn_cast<ObjCPropertyDecl>(R[0])) {
453           if ((ClassProperty->getPropertyAttributes()
454               != Property->getPropertyAttributes()) ||
455               !Ctx.hasSameType(ClassProperty->getType(), Property->getType()))
456             return false;
457       }
458       else
459         return false;
460     }
461 
462   // At this point, all required properties in this protocol conform to those
463   // declared in the class.
464   // Check that class implements the required methods of the protocol too.
465   bool HasAtleastOneRequiredMethod = false;
466   if (const ObjCProtocolDecl *PDecl = Protocol->getDefinition()) {
467     if (PDecl->meth_begin() == PDecl->meth_end())
468       return HasAtleastOneRequiredProperty;
469     for (ObjCContainerDecl::method_iterator M = PDecl->meth_begin(),
470          MEnd = PDecl->meth_end(); M != MEnd; ++M) {
471       ObjCMethodDecl *MD = (*M);
472       if (MD->isImplicit())
473         continue;
474       if (MD->getImplementationControl() == ObjCMethodDecl::Optional)
475         continue;
476       DeclContext::lookup_const_result R = ImpDecl->lookup(MD->getDeclName());
477       if (R.size() == 0)
478         return false;
479       bool match = false;
480       HasAtleastOneRequiredMethod = true;
481       for (unsigned I = 0, N = R.size(); I != N; ++I)
482         if (ObjCMethodDecl *ImpMD = dyn_cast<ObjCMethodDecl>(R[0]))
483           if (Ctx.ObjCMethodsAreEqual(MD, ImpMD)) {
484             match = true;
485             break;
486           }
487       if (!match)
488         return false;
489     }
490   }
491   if (HasAtleastOneRequiredProperty || HasAtleastOneRequiredMethod)
492     return true;
493   return false;
494 }
495 
496 static bool rewriteToObjCInterfaceDecl(const ObjCInterfaceDecl *IDecl,
497                     llvm::SmallVectorImpl<ObjCProtocolDecl*> &ConformingProtocols,
498                     const NSAPI &NS, edit::Commit &commit) {
499   const ObjCList<ObjCProtocolDecl> &Protocols = IDecl->getReferencedProtocols();
500   std::string ClassString;
501   SourceLocation EndLoc =
502   IDecl->getSuperClass() ? IDecl->getSuperClassLoc() : IDecl->getLocation();
503 
504   if (Protocols.empty()) {
505     ClassString = '<';
506     for (unsigned i = 0, e = ConformingProtocols.size(); i != e; i++) {
507       ClassString += ConformingProtocols[i]->getNameAsString();
508       if (i != (e-1))
509         ClassString += ", ";
510     }
511     ClassString += "> ";
512   }
513   else {
514     ClassString = ", ";
515     for (unsigned i = 0, e = ConformingProtocols.size(); i != e; i++) {
516       ClassString += ConformingProtocols[i]->getNameAsString();
517       if (i != (e-1))
518         ClassString += ", ";
519     }
520     ObjCInterfaceDecl::protocol_loc_iterator PL = IDecl->protocol_loc_end() - 1;
521     EndLoc = *PL;
522   }
523 
524   commit.insertAfterToken(EndLoc, ClassString);
525   return true;
526 }
527 
528 static bool rewriteToNSEnumDecl(const EnumDecl *EnumDcl,
529                                 const TypedefDecl *TypedefDcl,
530                                 const NSAPI &NS, edit::Commit &commit,
531                                 bool IsNSIntegerType,
532                                 bool NSOptions) {
533   std::string ClassString;
534   if (NSOptions)
535     ClassString = "typedef NS_OPTIONS(NSUInteger, ";
536   else
537     ClassString =
538       IsNSIntegerType ? "typedef NS_ENUM(NSInteger, "
539                       : "typedef NS_ENUM(NSUInteger, ";
540 
541   ClassString += TypedefDcl->getIdentifier()->getName();
542   ClassString += ')';
543   SourceRange R(EnumDcl->getLocStart(), EnumDcl->getLocStart());
544   commit.replace(R, ClassString);
545   SourceLocation EndOfEnumDclLoc = EnumDcl->getLocEnd();
546   EndOfEnumDclLoc = trans::findSemiAfterLocation(EndOfEnumDclLoc,
547                                                  NS.getASTContext(), /*IsDecl*/true);
548   if (!EndOfEnumDclLoc.isInvalid()) {
549     SourceRange EnumDclRange(EnumDcl->getLocStart(), EndOfEnumDclLoc);
550     commit.insertFromRange(TypedefDcl->getLocStart(), EnumDclRange);
551   }
552   else
553     return false;
554 
555   SourceLocation EndTypedefDclLoc = TypedefDcl->getLocEnd();
556   EndTypedefDclLoc = trans::findSemiAfterLocation(EndTypedefDclLoc,
557                                                  NS.getASTContext(), /*IsDecl*/true);
558   if (!EndTypedefDclLoc.isInvalid()) {
559     SourceRange TDRange(TypedefDcl->getLocStart(), EndTypedefDclLoc);
560     commit.remove(TDRange);
561   }
562   else
563     return false;
564 
565   EndOfEnumDclLoc = trans::findLocationAfterSemi(EnumDcl->getLocEnd(), NS.getASTContext(),
566                                                  /*IsDecl*/true);
567   if (!EndOfEnumDclLoc.isInvalid()) {
568     SourceLocation BeginOfEnumDclLoc = EnumDcl->getLocStart();
569     // FIXME. This assumes that enum decl; is immediately preceeded by eoln.
570     // It is trying to remove the enum decl. lines entirely.
571     BeginOfEnumDclLoc = BeginOfEnumDclLoc.getLocWithOffset(-1);
572     commit.remove(SourceRange(BeginOfEnumDclLoc, EndOfEnumDclLoc));
573     return true;
574   }
575   return false;
576 }
577 
578 static void rewriteToNSMacroDecl(const EnumDecl *EnumDcl,
579                                 const TypedefDecl *TypedefDcl,
580                                 const NSAPI &NS, edit::Commit &commit,
581                                  bool IsNSIntegerType) {
582   std::string ClassString =
583     IsNSIntegerType ? "NS_ENUM(NSInteger, " : "NS_OPTIONS(NSUInteger, ";
584   ClassString += TypedefDcl->getIdentifier()->getName();
585   ClassString += ')';
586   SourceRange R(EnumDcl->getLocStart(), EnumDcl->getLocStart());
587   commit.replace(R, ClassString);
588   SourceLocation TypedefLoc = TypedefDcl->getLocEnd();
589   commit.remove(SourceRange(TypedefLoc, TypedefLoc));
590 }
591 
592 static bool UseNSOptionsMacro(Preprocessor &PP, ASTContext &Ctx,
593                               const EnumDecl *EnumDcl) {
594   bool PowerOfTwo = true;
595   bool AllHexdecimalEnumerator = true;
596   uint64_t MaxPowerOfTwoVal = 0;
597   for (EnumDecl::enumerator_iterator EI = EnumDcl->enumerator_begin(),
598        EE = EnumDcl->enumerator_end(); EI != EE; ++EI) {
599     EnumConstantDecl *Enumerator = (*EI);
600     const Expr *InitExpr = Enumerator->getInitExpr();
601     if (!InitExpr) {
602       PowerOfTwo = false;
603       AllHexdecimalEnumerator = false;
604       continue;
605     }
606     InitExpr = InitExpr->IgnoreParenCasts();
607     if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(InitExpr))
608       if (BO->isShiftOp() || BO->isBitwiseOp())
609         return true;
610 
611     uint64_t EnumVal = Enumerator->getInitVal().getZExtValue();
612     if (PowerOfTwo && EnumVal) {
613       if (!llvm::isPowerOf2_64(EnumVal))
614         PowerOfTwo = false;
615       else if (EnumVal > MaxPowerOfTwoVal)
616         MaxPowerOfTwoVal = EnumVal;
617     }
618     if (AllHexdecimalEnumerator && EnumVal) {
619       bool FoundHexdecimalEnumerator = false;
620       SourceLocation EndLoc = Enumerator->getLocEnd();
621       Token Tok;
622       if (!PP.getRawToken(EndLoc, Tok, /*IgnoreWhiteSpace=*/true))
623         if (Tok.isLiteral() && Tok.getLength() > 2) {
624           if (const char *StringLit = Tok.getLiteralData())
625             FoundHexdecimalEnumerator =
626               (StringLit[0] == '0' && (toLowercase(StringLit[1]) == 'x'));
627         }
628       if (!FoundHexdecimalEnumerator)
629         AllHexdecimalEnumerator = false;
630     }
631   }
632   return AllHexdecimalEnumerator || (PowerOfTwo && (MaxPowerOfTwoVal > 2));
633 }
634 
635 void ObjCMigrateASTConsumer::migrateProtocolConformance(ASTContext &Ctx,
636                                             const ObjCImplementationDecl *ImpDecl) {
637   const ObjCInterfaceDecl *IDecl = ImpDecl->getClassInterface();
638   if (!IDecl || ObjCProtocolDecls.empty() || IDecl->isDeprecated())
639     return;
640   // Find all implicit conforming protocols for this class
641   // and make them explicit.
642   llvm::SmallPtrSet<ObjCProtocolDecl *, 8> ExplicitProtocols;
643   Ctx.CollectInheritedProtocols(IDecl, ExplicitProtocols);
644   llvm::SmallVector<ObjCProtocolDecl *, 8> PotentialImplicitProtocols;
645 
646   for (llvm::SmallPtrSet<ObjCProtocolDecl*, 32>::iterator I =
647        ObjCProtocolDecls.begin(),
648        E = ObjCProtocolDecls.end(); I != E; ++I)
649     if (!ExplicitProtocols.count(*I))
650       PotentialImplicitProtocols.push_back(*I);
651 
652   if (PotentialImplicitProtocols.empty())
653     return;
654 
655   // go through list of non-optional methods and properties in each protocol
656   // in the PotentialImplicitProtocols list. If class implements every one of the
657   // methods and properties, then this class conforms to this protocol.
658   llvm::SmallVector<ObjCProtocolDecl*, 8> ConformingProtocols;
659   for (unsigned i = 0, e = PotentialImplicitProtocols.size(); i != e; i++)
660     if (ClassImplementsAllMethodsAndProperties(Ctx, ImpDecl, IDecl,
661                                               PotentialImplicitProtocols[i]))
662       ConformingProtocols.push_back(PotentialImplicitProtocols[i]);
663 
664   if (ConformingProtocols.empty())
665     return;
666 
667   // Further reduce number of conforming protocols. If protocol P1 is in the list
668   // protocol P2 (P2<P1>), No need to include P1.
669   llvm::SmallVector<ObjCProtocolDecl*, 8> MinimalConformingProtocols;
670   for (unsigned i = 0, e = ConformingProtocols.size(); i != e; i++) {
671     bool DropIt = false;
672     ObjCProtocolDecl *TargetPDecl = ConformingProtocols[i];
673     for (unsigned i1 = 0, e1 = ConformingProtocols.size(); i1 != e1; i1++) {
674       ObjCProtocolDecl *PDecl = ConformingProtocols[i1];
675       if (PDecl == TargetPDecl)
676         continue;
677       if (PDecl->lookupProtocolNamed(
678             TargetPDecl->getDeclName().getAsIdentifierInfo())) {
679         DropIt = true;
680         break;
681       }
682     }
683     if (!DropIt)
684       MinimalConformingProtocols.push_back(TargetPDecl);
685   }
686   edit::Commit commit(*Editor);
687   rewriteToObjCInterfaceDecl(IDecl, MinimalConformingProtocols,
688                              *NSAPIObj, commit);
689   Editor->commit(commit);
690 }
691 
692 void ObjCMigrateASTConsumer::CacheObjCNSIntegerTypedefed(
693                                           const TypedefDecl *TypedefDcl) {
694 
695   QualType qt = TypedefDcl->getTypeSourceInfo()->getType();
696   if (NSAPIObj->isObjCNSIntegerType(qt))
697     NSIntegerTypedefed = TypedefDcl;
698   else if (NSAPIObj->isObjCNSUIntegerType(qt))
699     NSUIntegerTypedefed = TypedefDcl;
700 }
701 
702 bool ObjCMigrateASTConsumer::migrateNSEnumDecl(ASTContext &Ctx,
703                                            const EnumDecl *EnumDcl,
704                                            const TypedefDecl *TypedefDcl) {
705   if (!EnumDcl->isCompleteDefinition() || EnumDcl->getIdentifier() ||
706       EnumDcl->isDeprecated())
707     return false;
708   if (!TypedefDcl) {
709     if (NSIntegerTypedefed) {
710       TypedefDcl = NSIntegerTypedefed;
711       NSIntegerTypedefed = 0;
712     }
713     else if (NSUIntegerTypedefed) {
714       TypedefDcl = NSUIntegerTypedefed;
715       NSUIntegerTypedefed = 0;
716     }
717     else
718       return false;
719     unsigned FileIdOfTypedefDcl =
720       PP.getSourceManager().getFileID(TypedefDcl->getLocation()).getHashValue();
721     unsigned FileIdOfEnumDcl =
722       PP.getSourceManager().getFileID(EnumDcl->getLocation()).getHashValue();
723     if (FileIdOfTypedefDcl != FileIdOfEnumDcl)
724       return false;
725   }
726   if (TypedefDcl->isDeprecated())
727     return false;
728 
729   QualType qt = TypedefDcl->getTypeSourceInfo()->getType();
730   bool IsNSIntegerType = NSAPIObj->isObjCNSIntegerType(qt);
731   bool IsNSUIntegerType = !IsNSIntegerType && NSAPIObj->isObjCNSUIntegerType(qt);
732 
733   if (!IsNSIntegerType && !IsNSUIntegerType) {
734     // Also check for typedef enum {...} TD;
735     if (const EnumType *EnumTy = qt->getAs<EnumType>()) {
736       if (EnumTy->getDecl() == EnumDcl) {
737         bool NSOptions = UseNSOptionsMacro(PP, Ctx, EnumDcl);
738         if (NSOptions) {
739           if (!Ctx.Idents.get("NS_OPTIONS").hasMacroDefinition())
740             return false;
741         }
742         else if (!Ctx.Idents.get("NS_ENUM").hasMacroDefinition())
743           return false;
744         edit::Commit commit(*Editor);
745         rewriteToNSMacroDecl(EnumDcl, TypedefDcl, *NSAPIObj, commit, !NSOptions);
746         Editor->commit(commit);
747         return true;
748       }
749     }
750     return false;
751   }
752 
753   // We may still use NS_OPTIONS based on what we find in the enumertor list.
754   bool NSOptions = UseNSOptionsMacro(PP, Ctx, EnumDcl);
755   // NS_ENUM must be available.
756   if (IsNSIntegerType && !Ctx.Idents.get("NS_ENUM").hasMacroDefinition())
757     return false;
758   // NS_OPTIONS must be available.
759   if (IsNSUIntegerType && !Ctx.Idents.get("NS_OPTIONS").hasMacroDefinition())
760     return false;
761   edit::Commit commit(*Editor);
762   bool Res = rewriteToNSEnumDecl(EnumDcl, TypedefDcl, *NSAPIObj,
763                                  commit, IsNSIntegerType, NSOptions);
764   Editor->commit(commit);
765   return Res;
766 }
767 
768 static void ReplaceWithInstancetype(const ObjCMigrateASTConsumer &ASTC,
769                                     ObjCMethodDecl *OM) {
770   SourceRange R;
771   std::string ClassString;
772   if (TypeSourceInfo *TSInfo =  OM->getResultTypeSourceInfo()) {
773     TypeLoc TL = TSInfo->getTypeLoc();
774     R = SourceRange(TL.getBeginLoc(), TL.getEndLoc());
775     ClassString = "instancetype";
776   }
777   else {
778     R = SourceRange(OM->getLocStart(), OM->getLocStart());
779     ClassString = OM->isInstanceMethod() ? '-' : '+';
780     ClassString += " (instancetype)";
781   }
782   edit::Commit commit(*ASTC.Editor);
783   commit.replace(R, ClassString);
784   ASTC.Editor->commit(commit);
785 }
786 
787 static void ReplaceWithClasstype(const ObjCMigrateASTConsumer &ASTC,
788                                     ObjCMethodDecl *OM) {
789   ObjCInterfaceDecl *IDecl = OM->getClassInterface();
790   SourceRange R;
791   std::string ClassString;
792   if (TypeSourceInfo *TSInfo =  OM->getResultTypeSourceInfo()) {
793     TypeLoc TL = TSInfo->getTypeLoc();
794     R = SourceRange(TL.getBeginLoc(), TL.getEndLoc()); {
795       ClassString  = IDecl->getName();
796       ClassString += "*";
797     }
798   }
799   else {
800     R = SourceRange(OM->getLocStart(), OM->getLocStart());
801     ClassString = "+ (";
802     ClassString += IDecl->getName(); ClassString += "*)";
803   }
804   edit::Commit commit(*ASTC.Editor);
805   commit.replace(R, ClassString);
806   ASTC.Editor->commit(commit);
807 }
808 
809 void ObjCMigrateASTConsumer::migrateMethodInstanceType(ASTContext &Ctx,
810                                                        ObjCContainerDecl *CDecl,
811                                                        ObjCMethodDecl *OM) {
812   ObjCInstanceTypeFamily OIT_Family =
813     Selector::getInstTypeMethodFamily(OM->getSelector());
814 
815   std::string ClassName;
816   switch (OIT_Family) {
817     case OIT_None:
818       migrateFactoryMethod(Ctx, CDecl, OM);
819       return;
820     case OIT_Array:
821       ClassName = "NSArray";
822       break;
823     case OIT_Dictionary:
824       ClassName = "NSDictionary";
825       break;
826     case OIT_Singleton:
827       migrateFactoryMethod(Ctx, CDecl, OM, OIT_Singleton);
828       return;
829     case OIT_Init:
830       if (OM->getResultType()->isObjCIdType())
831         ReplaceWithInstancetype(*this, OM);
832       return;
833     case OIT_ReturnsSelf:
834       migrateFactoryMethod(Ctx, CDecl, OM, OIT_ReturnsSelf);
835       return;
836   }
837   if (!OM->getResultType()->isObjCIdType())
838     return;
839 
840   ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl);
841   if (!IDecl) {
842     if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
843       IDecl = CatDecl->getClassInterface();
844     else if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(CDecl))
845       IDecl = ImpDecl->getClassInterface();
846   }
847   if (!IDecl ||
848       !IDecl->lookupInheritedClass(&Ctx.Idents.get(ClassName))) {
849     migrateFactoryMethod(Ctx, CDecl, OM);
850     return;
851   }
852   ReplaceWithInstancetype(*this, OM);
853 }
854 
855 static bool TypeIsInnerPointer(QualType T) {
856   if (!T->isAnyPointerType())
857     return false;
858   if (T->isObjCObjectPointerType() || T->isObjCBuiltinType() ||
859       T->isBlockPointerType() || T->isFunctionPointerType() ||
860       ento::coreFoundation::isCFObjectRef(T))
861     return false;
862   // Also, typedef-of-pointer-to-incomplete-struct is something that we assume
863   // is not an innter pointer type.
864   QualType OrigT = T;
865   while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr()))
866     T = TD->getDecl()->getUnderlyingType();
867   if (OrigT == T || !T->isPointerType())
868     return true;
869   const PointerType* PT = T->getAs<PointerType>();
870   QualType UPointeeT = PT->getPointeeType().getUnqualifiedType();
871   if (UPointeeT->isRecordType()) {
872     const RecordType *RecordTy = UPointeeT->getAs<RecordType>();
873     if (!RecordTy->getDecl()->isCompleteDefinition())
874       return false;
875   }
876   return true;
877 }
878 
879 static bool AttributesMatch(const Decl *Decl1, const Decl *Decl2) {
880   if (Decl1->hasAttrs() != Decl2->hasAttrs())
881     return false;
882 
883   if (!Decl1->hasAttrs())
884     return true;
885 
886   const AttrVec &Attrs1 = Decl1->getAttrs();
887   const AttrVec &Attrs2 = Decl2->getAttrs();
888   // This list is very small, so this need not be optimized.
889   for (unsigned i = 0, e = Attrs1.size(); i != e; i++) {
890     bool match = false;
891     for (unsigned j = 0, f = Attrs2.size(); j != f; j++) {
892       // Matching attribute kind only. We are not getting into
893       // details of the attributes. For all practical purposes
894       // this is sufficient.
895       if (Attrs1[i]->getKind() == Attrs2[j]->getKind()) {
896         match = true;
897         break;
898       }
899     }
900     if (!match)
901       return false;
902   }
903   return true;
904 }
905 
906 static bool IsValidIdentifier(ASTContext &Ctx,
907                               const char *Name) {
908   if (!isIdentifierHead(Name[0]))
909     return false;
910   std::string NameString = Name;
911   NameString[0] = toLowercase(NameString[0]);
912   IdentifierInfo *II = &Ctx.Idents.get(NameString);
913   return II->getTokenID() ==  tok::identifier;
914 }
915 
916 bool ObjCMigrateASTConsumer::migrateProperty(ASTContext &Ctx,
917                              ObjCContainerDecl *D,
918                              ObjCMethodDecl *Method) {
919   if (Method->isPropertyAccessor() || !Method->isInstanceMethod() ||
920       Method->param_size() != 0)
921     return false;
922   // Is this method candidate to be a getter?
923   QualType GRT = Method->getResultType();
924   if (GRT->isVoidType())
925     return false;
926 
927   Selector GetterSelector = Method->getSelector();
928   ObjCInstanceTypeFamily OIT_Family =
929     Selector::getInstTypeMethodFamily(GetterSelector);
930 
931   if (OIT_Family != OIT_None)
932     return false;
933 
934   IdentifierInfo *getterName = GetterSelector.getIdentifierInfoForSlot(0);
935   Selector SetterSelector =
936   SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
937                                          PP.getSelectorTable(),
938                                          getterName);
939   ObjCMethodDecl *SetterMethod = D->getInstanceMethod(SetterSelector);
940   unsigned LengthOfPrefix = 0;
941   if (!SetterMethod) {
942     // try a different naming convention for getter: isXxxxx
943     StringRef getterNameString = getterName->getName();
944     bool IsPrefix = getterNameString.startswith("is");
945     // Note that we don't want to change an isXXX method of retainable object
946     // type to property (readonly or otherwise).
947     if (IsPrefix && GRT->isObjCRetainableType())
948       return false;
949     if (IsPrefix || getterNameString.startswith("get")) {
950       LengthOfPrefix = (IsPrefix ? 2 : 3);
951       const char *CGetterName = getterNameString.data() + LengthOfPrefix;
952       // Make sure that first character after "is" or "get" prefix can
953       // start an identifier.
954       if (!IsValidIdentifier(Ctx, CGetterName))
955         return false;
956       if (CGetterName[0] && isUppercase(CGetterName[0])) {
957         getterName = &Ctx.Idents.get(CGetterName);
958         SetterSelector =
959         SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
960                                                PP.getSelectorTable(),
961                                                getterName);
962         SetterMethod = D->getInstanceMethod(SetterSelector);
963       }
964     }
965   }
966 
967   if (SetterMethod) {
968     if ((ASTMigrateActions & FrontendOptions::ObjCMT_ReadwriteProperty) == 0)
969       return false;
970     if (SetterMethod->isDeprecated() ||
971         !AttributesMatch(Method, SetterMethod))
972       return false;
973 
974     // Is this a valid setter, matching the target getter?
975     QualType SRT = SetterMethod->getResultType();
976     if (!SRT->isVoidType())
977       return false;
978     const ParmVarDecl *argDecl = *SetterMethod->param_begin();
979     QualType ArgType = argDecl->getType();
980     if (!Ctx.hasSameUnqualifiedType(ArgType, GRT))
981       return false;
982     edit::Commit commit(*Editor);
983     rewriteToObjCProperty(Method, SetterMethod, *NSAPIObj, commit,
984                           LengthOfPrefix,
985                           (ASTMigrateActions &
986                            FrontendOptions::ObjCMT_AtomicProperty) != 0);
987     Editor->commit(commit);
988     return true;
989   }
990   else if (ASTMigrateActions & FrontendOptions::ObjCMT_ReadonlyProperty) {
991     // Try a non-void method with no argument (and no setter or property of same name
992     // as a 'readonly' property.
993     edit::Commit commit(*Editor);
994     rewriteToObjCProperty(Method, 0 /*SetterMethod*/, *NSAPIObj, commit,
995                           LengthOfPrefix,
996                           (ASTMigrateActions &
997                            FrontendOptions::ObjCMT_AtomicProperty) != 0);
998     Editor->commit(commit);
999     return true;
1000   }
1001   return false;
1002 }
1003 
1004 void ObjCMigrateASTConsumer::migrateNsReturnsInnerPointer(ASTContext &Ctx,
1005                                                           ObjCMethodDecl *OM) {
1006   if (OM->isImplicit() ||
1007       !OM->isInstanceMethod() ||
1008       OM->hasAttr<ObjCReturnsInnerPointerAttr>())
1009     return;
1010 
1011   QualType RT = OM->getResultType();
1012   if (!TypeIsInnerPointer(RT) ||
1013       !Ctx.Idents.get("NS_RETURNS_INNER_POINTER").hasMacroDefinition())
1014     return;
1015 
1016   edit::Commit commit(*Editor);
1017   commit.insertBefore(OM->getLocEnd(), " NS_RETURNS_INNER_POINTER");
1018   Editor->commit(commit);
1019 }
1020 
1021 void ObjCMigrateASTConsumer::migratePropertyNsReturnsInnerPointer(ASTContext &Ctx,
1022                                                                   ObjCPropertyDecl *P) {
1023   QualType T = P->getType();
1024 
1025   if (!TypeIsInnerPointer(T) ||
1026       !Ctx.Idents.get("NS_RETURNS_INNER_POINTER").hasMacroDefinition())
1027     return;
1028   edit::Commit commit(*Editor);
1029   commit.insertBefore(P->getLocEnd(), " NS_RETURNS_INNER_POINTER ");
1030   Editor->commit(commit);
1031 }
1032 
1033 void ObjCMigrateASTConsumer::migrateAllMethodInstaceType(ASTContext &Ctx,
1034                                                  ObjCContainerDecl *CDecl) {
1035   if (CDecl->isDeprecated())
1036     return;
1037 
1038   // migrate methods which can have instancetype as their result type.
1039   for (ObjCContainerDecl::method_iterator M = CDecl->meth_begin(),
1040        MEnd = CDecl->meth_end();
1041        M != MEnd; ++M) {
1042     ObjCMethodDecl *Method = (*M);
1043     if (Method->isDeprecated())
1044       continue;
1045     migrateMethodInstanceType(Ctx, CDecl, Method);
1046   }
1047 }
1048 
1049 void ObjCMigrateASTConsumer::migrateFactoryMethod(ASTContext &Ctx,
1050                                                   ObjCContainerDecl *CDecl,
1051                                                   ObjCMethodDecl *OM,
1052                                                   ObjCInstanceTypeFamily OIT_Family) {
1053   if (OM->isInstanceMethod() ||
1054       OM->getResultType() == Ctx.getObjCInstanceType() ||
1055       !OM->getResultType()->isObjCIdType())
1056     return;
1057 
1058   // Candidate factory methods are + (id) NaMeXXX : ... which belong to a class
1059   // NSYYYNamE with matching names be at least 3 characters long.
1060   ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl);
1061   if (!IDecl) {
1062     if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
1063       IDecl = CatDecl->getClassInterface();
1064     else if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(CDecl))
1065       IDecl = ImpDecl->getClassInterface();
1066   }
1067   if (!IDecl)
1068     return;
1069 
1070   std::string StringClassName = IDecl->getName();
1071   StringRef LoweredClassName(StringClassName);
1072   std::string StringLoweredClassName = LoweredClassName.lower();
1073   LoweredClassName = StringLoweredClassName;
1074 
1075   IdentifierInfo *MethodIdName = OM->getSelector().getIdentifierInfoForSlot(0);
1076   // Handle method with no name at its first selector slot; e.g. + (id):(int)x.
1077   if (!MethodIdName)
1078     return;
1079 
1080   std::string MethodName = MethodIdName->getName();
1081   if (OIT_Family == OIT_Singleton || OIT_Family == OIT_ReturnsSelf) {
1082     StringRef STRefMethodName(MethodName);
1083     size_t len = 0;
1084     if (STRefMethodName.startswith("standard"))
1085       len = strlen("standard");
1086     else if (STRefMethodName.startswith("shared"))
1087       len = strlen("shared");
1088     else if (STRefMethodName.startswith("default"))
1089       len = strlen("default");
1090     else
1091       return;
1092     MethodName = STRefMethodName.substr(len);
1093   }
1094   std::string MethodNameSubStr = MethodName.substr(0, 3);
1095   StringRef MethodNamePrefix(MethodNameSubStr);
1096   std::string StringLoweredMethodNamePrefix = MethodNamePrefix.lower();
1097   MethodNamePrefix = StringLoweredMethodNamePrefix;
1098   size_t Ix = LoweredClassName.rfind(MethodNamePrefix);
1099   if (Ix == StringRef::npos)
1100     return;
1101   std::string ClassNamePostfix = LoweredClassName.substr(Ix);
1102   StringRef LoweredMethodName(MethodName);
1103   std::string StringLoweredMethodName = LoweredMethodName.lower();
1104   LoweredMethodName = StringLoweredMethodName;
1105   if (!LoweredMethodName.startswith(ClassNamePostfix))
1106     return;
1107   if (OIT_Family == OIT_ReturnsSelf)
1108     ReplaceWithClasstype(*this, OM);
1109   else
1110     ReplaceWithInstancetype(*this, OM);
1111 }
1112 
1113 static bool IsVoidStarType(QualType Ty) {
1114   if (!Ty->isPointerType())
1115     return false;
1116 
1117   while (const TypedefType *TD = dyn_cast<TypedefType>(Ty.getTypePtr()))
1118     Ty = TD->getDecl()->getUnderlyingType();
1119 
1120   // Is the type void*?
1121   const PointerType* PT = Ty->getAs<PointerType>();
1122   if (PT->getPointeeType().getUnqualifiedType()->isVoidType())
1123     return true;
1124   return IsVoidStarType(PT->getPointeeType());
1125 }
1126 
1127 /// AuditedType - This routine audits the type AT and returns false if it is one of known
1128 /// CF object types or of the "void *" variety. It returns true if we don't care about the type
1129 /// such as a non-pointer or pointers which have no ownership issues (such as "int *").
1130 static bool AuditedType (QualType AT) {
1131   if (!AT->isAnyPointerType() && !AT->isBlockPointerType())
1132     return true;
1133   // FIXME. There isn't much we can say about CF pointer type; or is there?
1134   if (ento::coreFoundation::isCFObjectRef(AT) ||
1135       IsVoidStarType(AT) ||
1136       // If an ObjC object is type, assuming that it is not a CF function and
1137       // that it is an un-audited function.
1138       AT->isObjCObjectPointerType() || AT->isObjCBuiltinType())
1139     return false;
1140   // All other pointers are assumed audited as harmless.
1141   return true;
1142 }
1143 
1144 void ObjCMigrateASTConsumer::AnnotateImplicitBridging(ASTContext &Ctx) {
1145   if (CFFunctionIBCandidates.empty())
1146     return;
1147   if (!Ctx.Idents.get("CF_IMPLICIT_BRIDGING_ENABLED").hasMacroDefinition()) {
1148     CFFunctionIBCandidates.clear();
1149     FileId = 0;
1150     return;
1151   }
1152   // Insert CF_IMPLICIT_BRIDGING_ENABLE/CF_IMPLICIT_BRIDGING_DISABLED
1153   const Decl *FirstFD = CFFunctionIBCandidates[0];
1154   const Decl *LastFD  =
1155     CFFunctionIBCandidates[CFFunctionIBCandidates.size()-1];
1156   const char *PragmaString = "\nCF_IMPLICIT_BRIDGING_ENABLED\n\n";
1157   edit::Commit commit(*Editor);
1158   commit.insertBefore(FirstFD->getLocStart(), PragmaString);
1159   PragmaString = "\n\nCF_IMPLICIT_BRIDGING_DISABLED\n";
1160   SourceLocation EndLoc = LastFD->getLocEnd();
1161   // get location just past end of function location.
1162   EndLoc = PP.getLocForEndOfToken(EndLoc);
1163   if (isa<FunctionDecl>(LastFD)) {
1164     // For Methods, EndLoc points to the ending semcolon. So,
1165     // not of these extra work is needed.
1166     Token Tok;
1167     // get locaiton of token that comes after end of function.
1168     bool Failed = PP.getRawToken(EndLoc, Tok, /*IgnoreWhiteSpace=*/true);
1169     if (!Failed)
1170       EndLoc = Tok.getLocation();
1171   }
1172   commit.insertAfterToken(EndLoc, PragmaString);
1173   Editor->commit(commit);
1174   FileId = 0;
1175   CFFunctionIBCandidates.clear();
1176 }
1177 
1178 void ObjCMigrateASTConsumer::migrateCFAnnotation(ASTContext &Ctx, const Decl *Decl) {
1179   if (Decl->isDeprecated())
1180     return;
1181 
1182   if (Decl->hasAttr<CFAuditedTransferAttr>()) {
1183     assert(CFFunctionIBCandidates.empty() &&
1184            "Cannot have audited functions/methods inside user "
1185            "provided CF_IMPLICIT_BRIDGING_ENABLE");
1186     return;
1187   }
1188 
1189   // Finction must be annotated first.
1190   if (const FunctionDecl *FuncDecl = dyn_cast<FunctionDecl>(Decl)) {
1191     CF_BRIDGING_KIND AuditKind = migrateAddFunctionAnnotation(Ctx, FuncDecl);
1192     if (AuditKind == CF_BRIDGING_ENABLE) {
1193       CFFunctionIBCandidates.push_back(Decl);
1194       if (!FileId)
1195         FileId = PP.getSourceManager().getFileID(Decl->getLocation()).getHashValue();
1196     }
1197     else if (AuditKind == CF_BRIDGING_MAY_INCLUDE) {
1198       if (!CFFunctionIBCandidates.empty()) {
1199         CFFunctionIBCandidates.push_back(Decl);
1200         if (!FileId)
1201           FileId = PP.getSourceManager().getFileID(Decl->getLocation()).getHashValue();
1202       }
1203     }
1204     else
1205       AnnotateImplicitBridging(Ctx);
1206   }
1207   else {
1208     migrateAddMethodAnnotation(Ctx, cast<ObjCMethodDecl>(Decl));
1209     AnnotateImplicitBridging(Ctx);
1210   }
1211 }
1212 
1213 void ObjCMigrateASTConsumer::AddCFAnnotations(ASTContext &Ctx,
1214                                               const CallEffects &CE,
1215                                               const FunctionDecl *FuncDecl,
1216                                               bool ResultAnnotated) {
1217   // Annotate function.
1218   if (!ResultAnnotated) {
1219     RetEffect Ret = CE.getReturnValue();
1220     const char *AnnotationString = 0;
1221     if (Ret.getObjKind() == RetEffect::CF) {
1222       if (Ret.isOwned() &&
1223           Ctx.Idents.get("CF_RETURNS_RETAINED").hasMacroDefinition())
1224         AnnotationString = " CF_RETURNS_RETAINED";
1225       else if (Ret.notOwned() &&
1226                Ctx.Idents.get("CF_RETURNS_NOT_RETAINED").hasMacroDefinition())
1227         AnnotationString = " CF_RETURNS_NOT_RETAINED";
1228     }
1229     else if (Ret.getObjKind() == RetEffect::ObjC) {
1230       if (Ret.isOwned() &&
1231           Ctx.Idents.get("NS_RETURNS_RETAINED").hasMacroDefinition())
1232         AnnotationString = " NS_RETURNS_RETAINED";
1233     }
1234 
1235     if (AnnotationString) {
1236       edit::Commit commit(*Editor);
1237       commit.insertAfterToken(FuncDecl->getLocEnd(), AnnotationString);
1238       Editor->commit(commit);
1239     }
1240   }
1241   llvm::ArrayRef<ArgEffect> AEArgs = CE.getArgs();
1242   unsigned i = 0;
1243   for (FunctionDecl::param_const_iterator pi = FuncDecl->param_begin(),
1244        pe = FuncDecl->param_end(); pi != pe; ++pi, ++i) {
1245     const ParmVarDecl *pd = *pi;
1246     ArgEffect AE = AEArgs[i];
1247     if (AE == DecRef && !pd->getAttr<CFConsumedAttr>() &&
1248         Ctx.Idents.get("CF_CONSUMED").hasMacroDefinition()) {
1249       edit::Commit commit(*Editor);
1250       commit.insertBefore(pd->getLocation(), "CF_CONSUMED ");
1251       Editor->commit(commit);
1252     }
1253     else if (AE == DecRefMsg && !pd->getAttr<NSConsumedAttr>() &&
1254              Ctx.Idents.get("NS_CONSUMED").hasMacroDefinition()) {
1255       edit::Commit commit(*Editor);
1256       commit.insertBefore(pd->getLocation(), "NS_CONSUMED ");
1257       Editor->commit(commit);
1258     }
1259   }
1260 }
1261 
1262 
1263 ObjCMigrateASTConsumer::CF_BRIDGING_KIND
1264   ObjCMigrateASTConsumer::migrateAddFunctionAnnotation(
1265                                                   ASTContext &Ctx,
1266                                                   const FunctionDecl *FuncDecl) {
1267   if (FuncDecl->hasBody())
1268     return CF_BRIDGING_NONE;
1269 
1270   CallEffects CE  = CallEffects::getEffect(FuncDecl);
1271   bool FuncIsReturnAnnotated = (FuncDecl->getAttr<CFReturnsRetainedAttr>() ||
1272                                 FuncDecl->getAttr<CFReturnsNotRetainedAttr>() ||
1273                                 FuncDecl->getAttr<NSReturnsRetainedAttr>() ||
1274                                 FuncDecl->getAttr<NSReturnsNotRetainedAttr>() ||
1275                                 FuncDecl->getAttr<NSReturnsAutoreleasedAttr>());
1276 
1277   // Trivial case of when funciton is annotated and has no argument.
1278   if (FuncIsReturnAnnotated && FuncDecl->getNumParams() == 0)
1279     return CF_BRIDGING_NONE;
1280 
1281   bool ReturnCFAudited = false;
1282   if (!FuncIsReturnAnnotated) {
1283     RetEffect Ret = CE.getReturnValue();
1284     if (Ret.getObjKind() == RetEffect::CF &&
1285         (Ret.isOwned() || Ret.notOwned()))
1286       ReturnCFAudited = true;
1287     else if (!AuditedType(FuncDecl->getResultType()))
1288       return CF_BRIDGING_NONE;
1289   }
1290 
1291   // At this point result type is audited for potential inclusion.
1292   // Now, how about argument types.
1293   llvm::ArrayRef<ArgEffect> AEArgs = CE.getArgs();
1294   unsigned i = 0;
1295   bool ArgCFAudited = false;
1296   for (FunctionDecl::param_const_iterator pi = FuncDecl->param_begin(),
1297        pe = FuncDecl->param_end(); pi != pe; ++pi, ++i) {
1298     const ParmVarDecl *pd = *pi;
1299     ArgEffect AE = AEArgs[i];
1300     if (AE == DecRef /*CFConsumed annotated*/ || AE == IncRef) {
1301       if (AE == DecRef && !pd->getAttr<CFConsumedAttr>())
1302         ArgCFAudited = true;
1303       else if (AE == IncRef)
1304         ArgCFAudited = true;
1305     }
1306     else {
1307       QualType AT = pd->getType();
1308       if (!AuditedType(AT)) {
1309         AddCFAnnotations(Ctx, CE, FuncDecl, FuncIsReturnAnnotated);
1310         return CF_BRIDGING_NONE;
1311       }
1312     }
1313   }
1314   if (ReturnCFAudited || ArgCFAudited)
1315     return CF_BRIDGING_ENABLE;
1316 
1317   return CF_BRIDGING_MAY_INCLUDE;
1318 }
1319 
1320 void ObjCMigrateASTConsumer::migrateARCSafeAnnotation(ASTContext &Ctx,
1321                                                  ObjCContainerDecl *CDecl) {
1322   if (!isa<ObjCInterfaceDecl>(CDecl) || CDecl->isDeprecated())
1323     return;
1324 
1325   // migrate methods which can have instancetype as their result type.
1326   for (ObjCContainerDecl::method_iterator M = CDecl->meth_begin(),
1327        MEnd = CDecl->meth_end();
1328        M != MEnd; ++M) {
1329     ObjCMethodDecl *Method = (*M);
1330     migrateCFAnnotation(Ctx, Method);
1331   }
1332 }
1333 
1334 void ObjCMigrateASTConsumer::AddCFAnnotations(ASTContext &Ctx,
1335                                               const CallEffects &CE,
1336                                               const ObjCMethodDecl *MethodDecl,
1337                                               bool ResultAnnotated) {
1338   // Annotate function.
1339   if (!ResultAnnotated) {
1340     RetEffect Ret = CE.getReturnValue();
1341     const char *AnnotationString = 0;
1342     if (Ret.getObjKind() == RetEffect::CF) {
1343       if (Ret.isOwned() &&
1344           Ctx.Idents.get("CF_RETURNS_RETAINED").hasMacroDefinition())
1345         AnnotationString = " CF_RETURNS_RETAINED";
1346       else if (Ret.notOwned() &&
1347                Ctx.Idents.get("CF_RETURNS_NOT_RETAINED").hasMacroDefinition())
1348         AnnotationString = " CF_RETURNS_NOT_RETAINED";
1349     }
1350     else if (Ret.getObjKind() == RetEffect::ObjC) {
1351       ObjCMethodFamily OMF = MethodDecl->getMethodFamily();
1352       switch (OMF) {
1353         case clang::OMF_alloc:
1354         case clang::OMF_new:
1355         case clang::OMF_copy:
1356         case clang::OMF_init:
1357         case clang::OMF_mutableCopy:
1358           break;
1359 
1360         default:
1361           if (Ret.isOwned() &&
1362               Ctx.Idents.get("NS_RETURNS_RETAINED").hasMacroDefinition())
1363             AnnotationString = " NS_RETURNS_RETAINED";
1364           break;
1365       }
1366     }
1367 
1368     if (AnnotationString) {
1369       edit::Commit commit(*Editor);
1370       commit.insertBefore(MethodDecl->getLocEnd(), AnnotationString);
1371       Editor->commit(commit);
1372     }
1373   }
1374   llvm::ArrayRef<ArgEffect> AEArgs = CE.getArgs();
1375   unsigned i = 0;
1376   for (ObjCMethodDecl::param_const_iterator pi = MethodDecl->param_begin(),
1377        pe = MethodDecl->param_end(); pi != pe; ++pi, ++i) {
1378     const ParmVarDecl *pd = *pi;
1379     ArgEffect AE = AEArgs[i];
1380     if (AE == DecRef && !pd->getAttr<CFConsumedAttr>() &&
1381         Ctx.Idents.get("CF_CONSUMED").hasMacroDefinition()) {
1382       edit::Commit commit(*Editor);
1383       commit.insertBefore(pd->getLocation(), "CF_CONSUMED ");
1384       Editor->commit(commit);
1385     }
1386   }
1387 }
1388 
1389 void ObjCMigrateASTConsumer::migrateAddMethodAnnotation(
1390                                             ASTContext &Ctx,
1391                                             const ObjCMethodDecl *MethodDecl) {
1392   if (MethodDecl->hasBody() || MethodDecl->isImplicit())
1393     return;
1394 
1395   CallEffects CE  = CallEffects::getEffect(MethodDecl);
1396   bool MethodIsReturnAnnotated = (MethodDecl->getAttr<CFReturnsRetainedAttr>() ||
1397                                   MethodDecl->getAttr<CFReturnsNotRetainedAttr>() ||
1398                                   MethodDecl->getAttr<NSReturnsRetainedAttr>() ||
1399                                   MethodDecl->getAttr<NSReturnsNotRetainedAttr>() ||
1400                                   MethodDecl->getAttr<NSReturnsAutoreleasedAttr>());
1401 
1402   if (CE.getReceiver() ==  DecRefMsg &&
1403       !MethodDecl->getAttr<NSConsumesSelfAttr>() &&
1404       MethodDecl->getMethodFamily() != OMF_init &&
1405       MethodDecl->getMethodFamily() != OMF_release &&
1406       Ctx.Idents.get("NS_CONSUMES_SELF").hasMacroDefinition()) {
1407     edit::Commit commit(*Editor);
1408     commit.insertBefore(MethodDecl->getLocEnd(), " NS_CONSUMES_SELF");
1409     Editor->commit(commit);
1410   }
1411 
1412   // Trivial case of when funciton is annotated and has no argument.
1413   if (MethodIsReturnAnnotated &&
1414       (MethodDecl->param_begin() == MethodDecl->param_end()))
1415     return;
1416 
1417   if (!MethodIsReturnAnnotated) {
1418     RetEffect Ret = CE.getReturnValue();
1419     if ((Ret.getObjKind() == RetEffect::CF ||
1420          Ret.getObjKind() == RetEffect::ObjC) &&
1421         (Ret.isOwned() || Ret.notOwned())) {
1422       AddCFAnnotations(Ctx, CE, MethodDecl, false);
1423       return;
1424     }
1425     else if (!AuditedType(MethodDecl->getResultType()))
1426       return;
1427   }
1428 
1429   // At this point result type is either annotated or audited.
1430   // Now, how about argument types.
1431   llvm::ArrayRef<ArgEffect> AEArgs = CE.getArgs();
1432   unsigned i = 0;
1433   for (ObjCMethodDecl::param_const_iterator pi = MethodDecl->param_begin(),
1434        pe = MethodDecl->param_end(); pi != pe; ++pi, ++i) {
1435     const ParmVarDecl *pd = *pi;
1436     ArgEffect AE = AEArgs[i];
1437     if ((AE == DecRef && !pd->getAttr<CFConsumedAttr>()) || AE == IncRef ||
1438         !AuditedType(pd->getType())) {
1439       AddCFAnnotations(Ctx, CE, MethodDecl, MethodIsReturnAnnotated);
1440       return;
1441     }
1442   }
1443   return;
1444 }
1445 
1446 namespace {
1447 
1448 class RewritesReceiver : public edit::EditsReceiver {
1449   Rewriter &Rewrite;
1450 
1451 public:
1452   RewritesReceiver(Rewriter &Rewrite) : Rewrite(Rewrite) { }
1453 
1454   virtual void insert(SourceLocation loc, StringRef text) {
1455     Rewrite.InsertText(loc, text);
1456   }
1457   virtual void replace(CharSourceRange range, StringRef text) {
1458     Rewrite.ReplaceText(range.getBegin(), Rewrite.getRangeSize(range), text);
1459   }
1460 };
1461 
1462 }
1463 
1464 static bool
1465 IsReallyASystemHeader(ASTContext &Ctx, const FileEntry *file, FileID FID) {
1466   bool Invalid = false;
1467   const SrcMgr::SLocEntry &SEntry =
1468   Ctx.getSourceManager().getSLocEntry(FID, &Invalid);
1469   if (!Invalid && SEntry.isFile()) {
1470     const SrcMgr::FileInfo &FI = SEntry.getFile();
1471     if (!FI.hasLineDirectives()) {
1472       if (FI.getFileCharacteristic() == SrcMgr::C_ExternCSystem)
1473         return true;
1474       if (FI.getFileCharacteristic() == SrcMgr::C_System) {
1475         // This file is in a system header directory. Continue with commiting change
1476         // only if it is a user specified system directory because user put a
1477         // .system_framework file in the framework directory.
1478         StringRef Directory(file->getDir()->getName());
1479         size_t Ix = Directory.rfind(".framework");
1480         if (Ix == StringRef::npos)
1481           return true;
1482         std::string PatchToSystemFramework = Directory.slice(0, Ix+sizeof(".framework"));
1483         PatchToSystemFramework += ".system_framework";
1484         if (!llvm::sys::fs::exists(PatchToSystemFramework.data()))
1485           return true;
1486       }
1487     }
1488   }
1489   return false;
1490 }
1491 
1492 void ObjCMigrateASTConsumer::HandleTranslationUnit(ASTContext &Ctx) {
1493 
1494   TranslationUnitDecl *TU = Ctx.getTranslationUnitDecl();
1495   if (ASTMigrateActions & FrontendOptions::ObjCMT_MigrateDecls) {
1496     for (DeclContext::decl_iterator D = TU->decls_begin(), DEnd = TU->decls_end();
1497          D != DEnd; ++D) {
1498       if (unsigned FID =
1499             PP.getSourceManager().getFileID((*D)->getLocation()).getHashValue())
1500         if (FileId && FileId != FID) {
1501           if (ASTMigrateActions & FrontendOptions::ObjCMT_Annotation)
1502             AnnotateImplicitBridging(Ctx);
1503         }
1504 
1505       if (ObjCInterfaceDecl *CDecl = dyn_cast<ObjCInterfaceDecl>(*D))
1506         migrateObjCInterfaceDecl(Ctx, CDecl);
1507       if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(*D))
1508         migrateObjCInterfaceDecl(Ctx, CatDecl);
1509       else if (ObjCProtocolDecl *PDecl = dyn_cast<ObjCProtocolDecl>(*D))
1510         ObjCProtocolDecls.insert(PDecl);
1511       else if (const ObjCImplementationDecl *ImpDecl =
1512                dyn_cast<ObjCImplementationDecl>(*D)) {
1513         if (ASTMigrateActions & FrontendOptions::ObjCMT_ProtocolConformance)
1514           migrateProtocolConformance(Ctx, ImpDecl);
1515       }
1516       else if (const EnumDecl *ED = dyn_cast<EnumDecl>(*D)) {
1517         if (!(ASTMigrateActions & FrontendOptions::ObjCMT_NsMacros))
1518           continue;
1519         DeclContext::decl_iterator N = D;
1520         if (++N != DEnd) {
1521           const TypedefDecl *TD = dyn_cast<TypedefDecl>(*N);
1522           if (migrateNSEnumDecl(Ctx, ED, TD) && TD)
1523             D++;
1524         }
1525         else
1526           migrateNSEnumDecl(Ctx, ED, /*TypedefDecl */0);
1527       }
1528       else if (const TypedefDecl *TD = dyn_cast<TypedefDecl>(*D)) {
1529         if (!(ASTMigrateActions & FrontendOptions::ObjCMT_NsMacros))
1530           continue;
1531         DeclContext::decl_iterator N = D;
1532         if (++N == DEnd)
1533           continue;
1534         if (const EnumDecl *ED = dyn_cast<EnumDecl>(*N)) {
1535           if (++N != DEnd)
1536             if (const TypedefDecl *TDF = dyn_cast<TypedefDecl>(*N)) {
1537               // prefer typedef-follows-enum to enum-follows-typedef pattern.
1538               if (migrateNSEnumDecl(Ctx, ED, TDF)) {
1539                 ++D; ++D;
1540                 CacheObjCNSIntegerTypedefed(TD);
1541                 continue;
1542               }
1543             }
1544           if (migrateNSEnumDecl(Ctx, ED, TD)) {
1545             ++D;
1546             continue;
1547           }
1548         }
1549         CacheObjCNSIntegerTypedefed(TD);
1550       }
1551       else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*D)) {
1552         if (ASTMigrateActions & FrontendOptions::ObjCMT_Annotation)
1553           migrateCFAnnotation(Ctx, FD);
1554       }
1555 
1556       if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(*D)) {
1557         // migrate methods which can have instancetype as their result type.
1558         if (ASTMigrateActions & FrontendOptions::ObjCMT_Instancetype)
1559           migrateAllMethodInstaceType(Ctx, CDecl);
1560         // annotate methods with CF annotations.
1561         if (ASTMigrateActions & FrontendOptions::ObjCMT_Annotation)
1562           migrateARCSafeAnnotation(Ctx, CDecl);
1563       }
1564     }
1565     if (ASTMigrateActions & FrontendOptions::ObjCMT_Annotation)
1566       AnnotateImplicitBridging(Ctx);
1567   }
1568 
1569   Rewriter rewriter(Ctx.getSourceManager(), Ctx.getLangOpts());
1570   RewritesReceiver Rec(rewriter);
1571   Editor->applyRewrites(Rec);
1572 
1573   for (Rewriter::buffer_iterator
1574         I = rewriter.buffer_begin(), E = rewriter.buffer_end(); I != E; ++I) {
1575     FileID FID = I->first;
1576     RewriteBuffer &buf = I->second;
1577     const FileEntry *file = Ctx.getSourceManager().getFileEntryForID(FID);
1578     assert(file);
1579     if (IsReallyASystemHeader(Ctx, file, FID))
1580       continue;
1581     SmallString<512> newText;
1582     llvm::raw_svector_ostream vecOS(newText);
1583     buf.write(vecOS);
1584     vecOS.flush();
1585     llvm::MemoryBuffer *memBuf = llvm::MemoryBuffer::getMemBufferCopy(
1586                    StringRef(newText.data(), newText.size()), file->getName());
1587     SmallString<64> filePath(file->getName());
1588     FileMgr.FixupRelativePath(filePath);
1589     Remapper.remap(filePath.str(), memBuf);
1590   }
1591 
1592   if (IsOutputFile) {
1593     Remapper.flushToFile(MigrateDir, Ctx.getDiagnostics());
1594   } else {
1595     Remapper.flushToDisk(MigrateDir, Ctx.getDiagnostics());
1596   }
1597 }
1598 
1599 bool MigrateSourceAction::BeginInvocation(CompilerInstance &CI) {
1600   CI.getDiagnostics().setIgnoreAllWarnings(true);
1601   return true;
1602 }
1603 
1604 ASTConsumer *MigrateSourceAction::CreateASTConsumer(CompilerInstance &CI,
1605                                                   StringRef InFile) {
1606   PPConditionalDirectiveRecord *
1607     PPRec = new PPConditionalDirectiveRecord(CI.getSourceManager());
1608   CI.getPreprocessor().addPPCallbacks(PPRec);
1609   return new ObjCMigrateASTConsumer(CI.getFrontendOpts().OutputFile,
1610                                     FrontendOptions::ObjCMT_MigrateAll,
1611                                     Remapper,
1612                                     CI.getFileManager(),
1613                                     PPRec,
1614                                     CI.getPreprocessor(),
1615                                     /*isOutputFile=*/true);
1616 }
1617