1 //===--- RewriteObjC.cpp - Playground for the code rewriter ---------------===//
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 // Hacks and fun related to the code rewriter.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Rewrite/Frontend/ASTConsumers.h"
15 #include "clang/AST/AST.h"
16 #include "clang/AST/ASTConsumer.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/ParentMap.h"
19 #include "clang/Basic/CharInfo.h"
20 #include "clang/Basic/Diagnostic.h"
21 #include "clang/Basic/IdentifierTable.h"
22 #include "clang/Basic/SourceManager.h"
23 #include "clang/Basic/TargetInfo.h"
24 #include "clang/Lex/Lexer.h"
25 #include "clang/Rewrite/Core/Rewriter.h"
26 #include "llvm/ADT/DenseSet.h"
27 #include "llvm/ADT/SmallPtrSet.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/Support/MemoryBuffer.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include <memory>
32 
33 #ifdef CLANG_ENABLE_OBJC_REWRITER
34 
35 using namespace clang;
36 using llvm::utostr;
37 
38 namespace {
39   class RewriteModernObjC : public ASTConsumer {
40   protected:
41 
42     enum {
43       BLOCK_FIELD_IS_OBJECT   =  3,  /* id, NSObject, __attribute__((NSObject)),
44                                         block, ... */
45       BLOCK_FIELD_IS_BLOCK    =  7,  /* a block variable */
46       BLOCK_FIELD_IS_BYREF    =  8,  /* the on stack structure holding the
47                                         __block variable */
48       BLOCK_FIELD_IS_WEAK     = 16,  /* declared __weak, only used in byref copy
49                                         helpers */
50       BLOCK_BYREF_CALLER      = 128, /* called from __block (byref) copy/dispose
51                                         support routines */
52       BLOCK_BYREF_CURRENT_MAX = 256
53     };
54 
55     enum {
56       BLOCK_NEEDS_FREE =        (1 << 24),
57       BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
58       BLOCK_HAS_CXX_OBJ =       (1 << 26),
59       BLOCK_IS_GC =             (1 << 27),
60       BLOCK_IS_GLOBAL =         (1 << 28),
61       BLOCK_HAS_DESCRIPTOR =    (1 << 29)
62     };
63 
64     Rewriter Rewrite;
65     DiagnosticsEngine &Diags;
66     const LangOptions &LangOpts;
67     ASTContext *Context;
68     SourceManager *SM;
69     TranslationUnitDecl *TUDecl;
70     FileID MainFileID;
71     const char *MainFileStart, *MainFileEnd;
72     Stmt *CurrentBody;
73     ParentMap *PropParentMap; // created lazily.
74     std::string InFileName;
75     raw_ostream* OutFile;
76     std::string Preamble;
77 
78     TypeDecl *ProtocolTypeDecl;
79     VarDecl *GlobalVarDecl;
80     Expr *GlobalConstructionExp;
81     unsigned RewriteFailedDiag;
82     unsigned GlobalBlockRewriteFailedDiag;
83     // ObjC string constant support.
84     unsigned NumObjCStringLiterals;
85     VarDecl *ConstantStringClassReference;
86     RecordDecl *NSStringRecord;
87 
88     // ObjC foreach break/continue generation support.
89     int BcLabelCount;
90 
91     unsigned TryFinallyContainsReturnDiag;
92     // Needed for super.
93     ObjCMethodDecl *CurMethodDef;
94     RecordDecl *SuperStructDecl;
95     RecordDecl *ConstantStringDecl;
96 
97     FunctionDecl *MsgSendFunctionDecl;
98     FunctionDecl *MsgSendSuperFunctionDecl;
99     FunctionDecl *MsgSendStretFunctionDecl;
100     FunctionDecl *MsgSendSuperStretFunctionDecl;
101     FunctionDecl *MsgSendFpretFunctionDecl;
102     FunctionDecl *GetClassFunctionDecl;
103     FunctionDecl *GetMetaClassFunctionDecl;
104     FunctionDecl *GetSuperClassFunctionDecl;
105     FunctionDecl *SelGetUidFunctionDecl;
106     FunctionDecl *CFStringFunctionDecl;
107     FunctionDecl *SuperConstructorFunctionDecl;
108     FunctionDecl *CurFunctionDef;
109 
110     /* Misc. containers needed for meta-data rewrite. */
111     SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
112     SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
113     llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
114     llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
115     llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCWrittenInterfaces;
116     llvm::SmallPtrSet<TagDecl*, 32> GlobalDefinedTags;
117     SmallVector<ObjCInterfaceDecl*, 32> ObjCInterfacesSeen;
118     /// DefinedNonLazyClasses - List of defined "non-lazy" classes.
119     SmallVector<ObjCInterfaceDecl*, 8> DefinedNonLazyClasses;
120 
121     /// DefinedNonLazyCategories - List of defined "non-lazy" categories.
122     SmallVector<ObjCCategoryDecl *, 8> DefinedNonLazyCategories;
123 
124     SmallVector<Stmt *, 32> Stmts;
125     SmallVector<int, 8> ObjCBcLabelNo;
126     // Remember all the @protocol(<expr>) expressions.
127     llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
128 
129     llvm::DenseSet<uint64_t> CopyDestroyCache;
130 
131     // Block expressions.
132     SmallVector<BlockExpr *, 32> Blocks;
133     SmallVector<int, 32> InnerDeclRefsCount;
134     SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
135 
136     SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
137 
138 
139     // Block related declarations.
140     SmallVector<ValueDecl *, 8> BlockByCopyDecls;
141     llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
142     SmallVector<ValueDecl *, 8> BlockByRefDecls;
143     llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
144     llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
145     llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
146     llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
147 
148     llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
149     llvm::DenseMap<ObjCInterfaceDecl *,
150                     llvm::SmallPtrSet<ObjCIvarDecl *, 8> > ReferencedIvars;
151 
152     // ivar bitfield grouping containers
153     llvm::DenseSet<const ObjCInterfaceDecl *> ObjCInterefaceHasBitfieldGroups;
154     llvm::DenseMap<const ObjCIvarDecl* , unsigned> IvarGroupNumber;
155     // This container maps an <class, group number for ivar> tuple to the type
156     // of the struct where the bitfield belongs.
157     llvm::DenseMap<std::pair<const ObjCInterfaceDecl*, unsigned>, QualType> GroupRecordType;
158     SmallVector<FunctionDecl*, 32> FunctionDefinitionsSeen;
159 
160     // This maps an original source AST to it's rewritten form. This allows
161     // us to avoid rewriting the same node twice (which is very uncommon).
162     // This is needed to support some of the exotic property rewriting.
163     llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
164 
165     // Needed for header files being rewritten
166     bool IsHeader;
167     bool SilenceRewriteMacroWarning;
168     bool GenerateLineInfo;
169     bool objc_impl_method;
170 
171     bool DisableReplaceStmt;
172     class DisableReplaceStmtScope {
173       RewriteModernObjC &R;
174       bool SavedValue;
175 
176     public:
177       DisableReplaceStmtScope(RewriteModernObjC &R)
178         : R(R), SavedValue(R.DisableReplaceStmt) {
179         R.DisableReplaceStmt = true;
180       }
181       ~DisableReplaceStmtScope() {
182         R.DisableReplaceStmt = SavedValue;
183       }
184     };
185     void InitializeCommon(ASTContext &context);
186 
187   public:
188     llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
189     // Top Level Driver code.
190     bool HandleTopLevelDecl(DeclGroupRef D) override {
191       for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
192         if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(*I)) {
193           if (!Class->isThisDeclarationADefinition()) {
194             RewriteForwardClassDecl(D);
195             break;
196           } else {
197             // Keep track of all interface declarations seen.
198             ObjCInterfacesSeen.push_back(Class);
199             break;
200           }
201         }
202 
203         if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>(*I)) {
204           if (!Proto->isThisDeclarationADefinition()) {
205             RewriteForwardProtocolDecl(D);
206             break;
207           }
208         }
209 
210         if (FunctionDecl *FDecl = dyn_cast<FunctionDecl>(*I)) {
211           // Under modern abi, we cannot translate body of the function
212           // yet until all class extensions and its implementation is seen.
213           // This is because they may introduce new bitfields which must go
214           // into their grouping struct.
215           if (FDecl->isThisDeclarationADefinition() &&
216               // Not c functions defined inside an objc container.
217               !FDecl->isTopLevelDeclInObjCContainer()) {
218             FunctionDefinitionsSeen.push_back(FDecl);
219             break;
220           }
221         }
222         HandleTopLevelSingleDecl(*I);
223       }
224       return true;
225     }
226 
227     void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override {
228       for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
229         if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(*I)) {
230           if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
231             RewriteBlockPointerDecl(TD);
232           else if (TD->getUnderlyingType()->isFunctionPointerType())
233             CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
234           else
235             RewriteObjCQualifiedInterfaceTypes(TD);
236         }
237       }
238       return;
239     }
240 
241     void HandleTopLevelSingleDecl(Decl *D);
242     void HandleDeclInMainFile(Decl *D);
243     RewriteModernObjC(std::string inFile, raw_ostream *OS,
244                 DiagnosticsEngine &D, const LangOptions &LOpts,
245                 bool silenceMacroWarn, bool LineInfo);
246 
247     ~RewriteModernObjC() {}
248 
249     void HandleTranslationUnit(ASTContext &C) override;
250 
251     void ReplaceStmt(Stmt *Old, Stmt *New) {
252       Stmt *ReplacingStmt = ReplacedNodes[Old];
253 
254       if (ReplacingStmt)
255         return; // We can't rewrite the same node twice.
256 
257       if (DisableReplaceStmt)
258         return;
259 
260       // If replacement succeeded or warning disabled return with no warning.
261       if (!Rewrite.ReplaceStmt(Old, New)) {
262         ReplacedNodes[Old] = New;
263         return;
264       }
265       if (SilenceRewriteMacroWarning)
266         return;
267       Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
268                    << Old->getSourceRange();
269     }
270 
271     void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
272       assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
273       if (DisableReplaceStmt)
274         return;
275 
276       // Measure the old text.
277       int Size = Rewrite.getRangeSize(SrcRange);
278       if (Size == -1) {
279         Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
280                      << Old->getSourceRange();
281         return;
282       }
283       // Get the new text.
284       std::string SStr;
285       llvm::raw_string_ostream S(SStr);
286       New->printPretty(S, nullptr, PrintingPolicy(LangOpts));
287       const std::string &Str = S.str();
288 
289       // If replacement succeeded or warning disabled return with no warning.
290       if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
291         ReplacedNodes[Old] = New;
292         return;
293       }
294       if (SilenceRewriteMacroWarning)
295         return;
296       Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
297                    << Old->getSourceRange();
298     }
299 
300     void InsertText(SourceLocation Loc, StringRef Str,
301                     bool InsertAfter = true) {
302       // If insertion succeeded or warning disabled return with no warning.
303       if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
304           SilenceRewriteMacroWarning)
305         return;
306 
307       Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
308     }
309 
310     void ReplaceText(SourceLocation Start, unsigned OrigLength,
311                      StringRef Str) {
312       // If removal succeeded or warning disabled return with no warning.
313       if (!Rewrite.ReplaceText(Start, OrigLength, Str) ||
314           SilenceRewriteMacroWarning)
315         return;
316 
317       Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
318     }
319 
320     // Syntactic Rewriting.
321     void RewriteRecordBody(RecordDecl *RD);
322     void RewriteInclude();
323     void RewriteLineDirective(const Decl *D);
324     void ConvertSourceLocationToLineDirective(SourceLocation Loc,
325                                               std::string &LineString);
326     void RewriteForwardClassDecl(DeclGroupRef D);
327     void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
328     void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
329                                      const std::string &typedefString);
330     void RewriteImplementations();
331     void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
332                                  ObjCImplementationDecl *IMD,
333                                  ObjCCategoryImplDecl *CID);
334     void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
335     void RewriteImplementationDecl(Decl *Dcl);
336     void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
337                                ObjCMethodDecl *MDecl, std::string &ResultStr);
338     void RewriteTypeIntoString(QualType T, std::string &ResultStr,
339                                const FunctionType *&FPRetType);
340     void RewriteByRefString(std::string &ResultStr, const std::string &Name,
341                             ValueDecl *VD, bool def=false);
342     void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
343     void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
344     void RewriteForwardProtocolDecl(DeclGroupRef D);
345     void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
346     void RewriteMethodDeclaration(ObjCMethodDecl *Method);
347     void RewriteProperty(ObjCPropertyDecl *prop);
348     void RewriteFunctionDecl(FunctionDecl *FD);
349     void RewriteBlockPointerType(std::string& Str, QualType Type);
350     void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
351     void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
352     void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
353     void RewriteTypeOfDecl(VarDecl *VD);
354     void RewriteObjCQualifiedInterfaceTypes(Expr *E);
355 
356     std::string getIvarAccessString(ObjCIvarDecl *D);
357 
358     // Expression Rewriting.
359     Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
360     Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
361     Stmt *RewritePropertyOrImplicitGetter(PseudoObjectExpr *Pseudo);
362     Stmt *RewritePropertyOrImplicitSetter(PseudoObjectExpr *Pseudo);
363     Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
364     Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
365     Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
366     Stmt *RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp);
367     Stmt *RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp);
368     Stmt *RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp);
369     Stmt *RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp);
370     Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
371     Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
372     Stmt *RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt  *S);
373     Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
374     Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
375     Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
376                                        SourceLocation OrigEnd);
377     Stmt *RewriteBreakStmt(BreakStmt *S);
378     Stmt *RewriteContinueStmt(ContinueStmt *S);
379     void RewriteCastExpr(CStyleCastExpr *CE);
380     void RewriteImplicitCastObjCExpr(CastExpr *IE);
381     void RewriteLinkageSpec(LinkageSpecDecl *LSD);
382 
383     // Computes ivar bitfield group no.
384     unsigned ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV);
385     // Names field decl. for ivar bitfield group.
386     void ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV, std::string &Result);
387     // Names struct type for ivar bitfield group.
388     void ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV, std::string &Result);
389     // Names symbol for ivar bitfield group field offset.
390     void ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV, std::string &Result);
391     // Given an ivar bitfield, it builds (or finds) its group record type.
392     QualType GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV);
393     QualType SynthesizeBitfieldGroupStructType(
394                                     ObjCIvarDecl *IV,
395                                     SmallVectorImpl<ObjCIvarDecl *> &IVars);
396 
397     // Block rewriting.
398     void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
399 
400     // Block specific rewrite rules.
401     void RewriteBlockPointerDecl(NamedDecl *VD);
402     void RewriteByRefVar(VarDecl *VD, bool firstDecl, bool lastDecl);
403     Stmt *RewriteBlockDeclRefExpr(DeclRefExpr *VD);
404     Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
405     void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
406 
407     void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
408                                       std::string &Result);
409 
410     void RewriteObjCFieldDecl(FieldDecl *fieldDecl, std::string &Result);
411     bool IsTagDefinedInsideClass(ObjCContainerDecl *IDecl, TagDecl *Tag,
412                                  bool &IsNamedDefinition);
413     void RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
414                                               std::string &Result);
415 
416     bool RewriteObjCFieldDeclType(QualType &Type, std::string &Result);
417 
418     void RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
419                                   std::string &Result);
420 
421     void Initialize(ASTContext &context) override;
422 
423     // Misc. AST transformation routines. Sometimes they end up calling
424     // rewriting routines on the new ASTs.
425     CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
426                                            Expr **args, unsigned nargs,
427                                            SourceLocation StartLoc=SourceLocation(),
428                                            SourceLocation EndLoc=SourceLocation());
429 
430     Expr *SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
431                                         QualType returnType,
432                                         SmallVectorImpl<QualType> &ArgTypes,
433                                         SmallVectorImpl<Expr*> &MsgExprs,
434                                         ObjCMethodDecl *Method);
435 
436     Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
437                            SourceLocation StartLoc=SourceLocation(),
438                            SourceLocation EndLoc=SourceLocation());
439 
440     void SynthCountByEnumWithState(std::string &buf);
441     void SynthMsgSendFunctionDecl();
442     void SynthMsgSendSuperFunctionDecl();
443     void SynthMsgSendStretFunctionDecl();
444     void SynthMsgSendFpretFunctionDecl();
445     void SynthMsgSendSuperStretFunctionDecl();
446     void SynthGetClassFunctionDecl();
447     void SynthGetMetaClassFunctionDecl();
448     void SynthGetSuperClassFunctionDecl();
449     void SynthSelGetUidFunctionDecl();
450     void SynthSuperConstructorFunctionDecl();
451 
452     // Rewriting metadata
453     template<typename MethodIterator>
454     void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
455                                     MethodIterator MethodEnd,
456                                     bool IsInstanceMethod,
457                                     StringRef prefix,
458                                     StringRef ClassName,
459                                     std::string &Result);
460     void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
461                                      std::string &Result);
462     void RewriteObjCProtocolListMetaData(
463                    const ObjCList<ObjCProtocolDecl> &Prots,
464                    StringRef prefix, StringRef ClassName, std::string &Result);
465     void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
466                                           std::string &Result);
467     void RewriteClassSetupInitHook(std::string &Result);
468 
469     void RewriteMetaDataIntoBuffer(std::string &Result);
470     void WriteImageInfo(std::string &Result);
471     void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
472                                              std::string &Result);
473     void RewriteCategorySetupInitHook(std::string &Result);
474 
475     // Rewriting ivar
476     void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
477                                               std::string &Result);
478     Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV);
479 
480 
481     std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
482     std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
483                                       StringRef funcName, std::string Tag);
484     std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
485                                       StringRef funcName, std::string Tag);
486     std::string SynthesizeBlockImpl(BlockExpr *CE,
487                                     std::string Tag, std::string Desc);
488     std::string SynthesizeBlockDescriptor(std::string DescTag,
489                                           std::string ImplTag,
490                                           int i, StringRef funcName,
491                                           unsigned hasCopy);
492     Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
493     void SynthesizeBlockLiterals(SourceLocation FunLocStart,
494                                  StringRef FunName);
495     FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
496     Stmt *SynthBlockInitExpr(BlockExpr *Exp,
497                       const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
498 
499     // Misc. helper routines.
500     QualType getProtocolType();
501     void WarnAboutReturnGotoStmts(Stmt *S);
502     void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
503     void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
504     void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
505 
506     bool IsDeclStmtInForeachHeader(DeclStmt *DS);
507     void CollectBlockDeclRefInfo(BlockExpr *Exp);
508     void GetBlockDeclRefExprs(Stmt *S);
509     void GetInnerBlockDeclRefExprs(Stmt *S,
510                 SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
511                 llvm::SmallPtrSet<const DeclContext *, 8> &InnerContexts);
512 
513     // We avoid calling Type::isBlockPointerType(), since it operates on the
514     // canonical type. We only care if the top-level type is a closure pointer.
515     bool isTopLevelBlockPointerType(QualType T) {
516       return isa<BlockPointerType>(T);
517     }
518 
519     /// convertBlockPointerToFunctionPointer - Converts a block-pointer type
520     /// to a function pointer type and upon success, returns true; false
521     /// otherwise.
522     bool convertBlockPointerToFunctionPointer(QualType &T) {
523       if (isTopLevelBlockPointerType(T)) {
524         const BlockPointerType *BPT = T->getAs<BlockPointerType>();
525         T = Context->getPointerType(BPT->getPointeeType());
526         return true;
527       }
528       return false;
529     }
530 
531     bool convertObjCTypeToCStyleType(QualType &T);
532 
533     bool needToScanForQualifiers(QualType T);
534     QualType getSuperStructType();
535     QualType getConstantStringStructType();
536     QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
537     bool BufferContainsPPDirectives(const char *startBuf, const char *endBuf);
538 
539     void convertToUnqualifiedObjCType(QualType &T) {
540       if (T->isObjCQualifiedIdType()) {
541         bool isConst = T.isConstQualified();
542         T = isConst ? Context->getObjCIdType().withConst()
543                     : Context->getObjCIdType();
544       }
545       else if (T->isObjCQualifiedClassType())
546         T = Context->getObjCClassType();
547       else if (T->isObjCObjectPointerType() &&
548                T->getPointeeType()->isObjCQualifiedInterfaceType()) {
549         if (const ObjCObjectPointerType * OBJPT =
550               T->getAsObjCInterfacePointerType()) {
551           const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
552           T = QualType(IFaceT, 0);
553           T = Context->getPointerType(T);
554         }
555      }
556     }
557 
558     // FIXME: This predicate seems like it would be useful to add to ASTContext.
559     bool isObjCType(QualType T) {
560       if (!LangOpts.ObjC1 && !LangOpts.ObjC2)
561         return false;
562 
563       QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
564 
565       if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
566           OCT == Context->getCanonicalType(Context->getObjCClassType()))
567         return true;
568 
569       if (const PointerType *PT = OCT->getAs<PointerType>()) {
570         if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
571             PT->getPointeeType()->isObjCQualifiedIdType())
572           return true;
573       }
574       return false;
575     }
576     bool PointerTypeTakesAnyBlockArguments(QualType QT);
577     bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
578     void GetExtentOfArgList(const char *Name, const char *&LParen,
579                             const char *&RParen);
580 
581     void QuoteDoublequotes(std::string &From, std::string &To) {
582       for (unsigned i = 0; i < From.length(); i++) {
583         if (From[i] == '"')
584           To += "\\\"";
585         else
586           To += From[i];
587       }
588     }
589 
590     QualType getSimpleFunctionType(QualType result,
591                                    ArrayRef<QualType> args,
592                                    bool variadic = false) {
593       if (result == Context->getObjCInstanceType())
594         result =  Context->getObjCIdType();
595       FunctionProtoType::ExtProtoInfo fpi;
596       fpi.Variadic = variadic;
597       return Context->getFunctionType(result, args, fpi);
598     }
599 
600     // Helper function: create a CStyleCastExpr with trivial type source info.
601     CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
602                                              CastKind Kind, Expr *E) {
603       TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(Ty, SourceLocation());
604       return CStyleCastExpr::Create(*Ctx, Ty, VK_RValue, Kind, E, nullptr,
605                                     TInfo, SourceLocation(), SourceLocation());
606     }
607 
608     bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
609       IdentifierInfo* II = &Context->Idents.get("load");
610       Selector LoadSel = Context->Selectors.getSelector(0, &II);
611       return OD->getClassMethod(LoadSel) != nullptr;
612     }
613 
614     StringLiteral *getStringLiteral(StringRef Str) {
615       QualType StrType = Context->getConstantArrayType(
616           Context->CharTy, llvm::APInt(32, Str.size() + 1), ArrayType::Normal,
617           0);
618       return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
619                                    /*Pascal=*/false, StrType, SourceLocation());
620     }
621   };
622 
623 }
624 
625 void RewriteModernObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
626                                                    NamedDecl *D) {
627   if (const FunctionProtoType *fproto
628       = dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
629     for (const auto &I : fproto->param_types())
630       if (isTopLevelBlockPointerType(I)) {
631         // All the args are checked/rewritten. Don't call twice!
632         RewriteBlockPointerDecl(D);
633         break;
634       }
635   }
636 }
637 
638 void RewriteModernObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
639   const PointerType *PT = funcType->getAs<PointerType>();
640   if (PT && PointerTypeTakesAnyBlockArguments(funcType))
641     RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
642 }
643 
644 static bool IsHeaderFile(const std::string &Filename) {
645   std::string::size_type DotPos = Filename.rfind('.');
646 
647   if (DotPos == std::string::npos) {
648     // no file extension
649     return false;
650   }
651 
652   std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
653   // C header: .h
654   // C++ header: .hh or .H;
655   return Ext == "h" || Ext == "hh" || Ext == "H";
656 }
657 
658 RewriteModernObjC::RewriteModernObjC(std::string inFile, raw_ostream* OS,
659                          DiagnosticsEngine &D, const LangOptions &LOpts,
660                          bool silenceMacroWarn,
661                          bool LineInfo)
662       : Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(OS),
663         SilenceRewriteMacroWarning(silenceMacroWarn), GenerateLineInfo(LineInfo) {
664   IsHeader = IsHeaderFile(inFile);
665   RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
666                "rewriting sub-expression within a macro (may not be correct)");
667   // FIXME. This should be an error. But if block is not called, it is OK. And it
668   // may break including some headers.
669   GlobalBlockRewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
670     "rewriting block literal declared in global scope is not implemented");
671 
672   TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
673                DiagnosticsEngine::Warning,
674                "rewriter doesn't support user-specified control flow semantics "
675                "for @try/@finally (code may not execute properly)");
676 }
677 
678 ASTConsumer *clang::CreateModernObjCRewriter(const std::string& InFile,
679                                        raw_ostream* OS,
680                                        DiagnosticsEngine &Diags,
681                                        const LangOptions &LOpts,
682                                        bool SilenceRewriteMacroWarning,
683                                        bool LineInfo) {
684     return new RewriteModernObjC(InFile, OS, Diags, LOpts,
685                                  SilenceRewriteMacroWarning, LineInfo);
686 }
687 
688 void RewriteModernObjC::InitializeCommon(ASTContext &context) {
689   Context = &context;
690   SM = &Context->getSourceManager();
691   TUDecl = Context->getTranslationUnitDecl();
692   MsgSendFunctionDecl = nullptr;
693   MsgSendSuperFunctionDecl = nullptr;
694   MsgSendStretFunctionDecl = nullptr;
695   MsgSendSuperStretFunctionDecl = nullptr;
696   MsgSendFpretFunctionDecl = nullptr;
697   GetClassFunctionDecl = nullptr;
698   GetMetaClassFunctionDecl = nullptr;
699   GetSuperClassFunctionDecl = nullptr;
700   SelGetUidFunctionDecl = nullptr;
701   CFStringFunctionDecl = nullptr;
702   ConstantStringClassReference = nullptr;
703   NSStringRecord = nullptr;
704   CurMethodDef = nullptr;
705   CurFunctionDef = nullptr;
706   GlobalVarDecl = nullptr;
707   GlobalConstructionExp = nullptr;
708   SuperStructDecl = nullptr;
709   ProtocolTypeDecl = nullptr;
710   ConstantStringDecl = nullptr;
711   BcLabelCount = 0;
712   SuperConstructorFunctionDecl = nullptr;
713   NumObjCStringLiterals = 0;
714   PropParentMap = nullptr;
715   CurrentBody = nullptr;
716   DisableReplaceStmt = false;
717   objc_impl_method = false;
718 
719   // Get the ID and start/end of the main file.
720   MainFileID = SM->getMainFileID();
721   const llvm::MemoryBuffer *MainBuf = SM->getBuffer(MainFileID);
722   MainFileStart = MainBuf->getBufferStart();
723   MainFileEnd = MainBuf->getBufferEnd();
724 
725   Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
726 }
727 
728 //===----------------------------------------------------------------------===//
729 // Top Level Driver Code
730 //===----------------------------------------------------------------------===//
731 
732 void RewriteModernObjC::HandleTopLevelSingleDecl(Decl *D) {
733   if (Diags.hasErrorOccurred())
734     return;
735 
736   // Two cases: either the decl could be in the main file, or it could be in a
737   // #included file.  If the former, rewrite it now.  If the later, check to see
738   // if we rewrote the #include/#import.
739   SourceLocation Loc = D->getLocation();
740   Loc = SM->getExpansionLoc(Loc);
741 
742   // If this is for a builtin, ignore it.
743   if (Loc.isInvalid()) return;
744 
745   // Look for built-in declarations that we need to refer during the rewrite.
746   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
747     RewriteFunctionDecl(FD);
748   } else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
749     // declared in <Foundation/NSString.h>
750     if (FVD->getName() == "_NSConstantStringClassReference") {
751       ConstantStringClassReference = FVD;
752       return;
753     }
754   } else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
755     RewriteCategoryDecl(CD);
756   } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
757     if (PD->isThisDeclarationADefinition())
758       RewriteProtocolDecl(PD);
759   } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
760     // FIXME. This will not work in all situations and leaving it out
761     // is harmless.
762     // RewriteLinkageSpec(LSD);
763 
764     // Recurse into linkage specifications
765     for (DeclContext::decl_iterator DI = LSD->decls_begin(),
766                                  DIEnd = LSD->decls_end();
767          DI != DIEnd; ) {
768       if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>((*DI))) {
769         if (!IFace->isThisDeclarationADefinition()) {
770           SmallVector<Decl *, 8> DG;
771           SourceLocation StartLoc = IFace->getLocStart();
772           do {
773             if (isa<ObjCInterfaceDecl>(*DI) &&
774                 !cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
775                 StartLoc == (*DI)->getLocStart())
776               DG.push_back(*DI);
777             else
778               break;
779 
780             ++DI;
781           } while (DI != DIEnd);
782           RewriteForwardClassDecl(DG);
783           continue;
784         }
785         else {
786           // Keep track of all interface declarations seen.
787           ObjCInterfacesSeen.push_back(IFace);
788           ++DI;
789           continue;
790         }
791       }
792 
793       if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>((*DI))) {
794         if (!Proto->isThisDeclarationADefinition()) {
795           SmallVector<Decl *, 8> DG;
796           SourceLocation StartLoc = Proto->getLocStart();
797           do {
798             if (isa<ObjCProtocolDecl>(*DI) &&
799                 !cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
800                 StartLoc == (*DI)->getLocStart())
801               DG.push_back(*DI);
802             else
803               break;
804 
805             ++DI;
806           } while (DI != DIEnd);
807           RewriteForwardProtocolDecl(DG);
808           continue;
809         }
810       }
811 
812       HandleTopLevelSingleDecl(*DI);
813       ++DI;
814     }
815   }
816   // If we have a decl in the main file, see if we should rewrite it.
817   if (SM->isWrittenInMainFile(Loc))
818     return HandleDeclInMainFile(D);
819 }
820 
821 //===----------------------------------------------------------------------===//
822 // Syntactic (non-AST) Rewriting Code
823 //===----------------------------------------------------------------------===//
824 
825 void RewriteModernObjC::RewriteInclude() {
826   SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
827   StringRef MainBuf = SM->getBufferData(MainFileID);
828   const char *MainBufStart = MainBuf.begin();
829   const char *MainBufEnd = MainBuf.end();
830   size_t ImportLen = strlen("import");
831 
832   // Loop over the whole file, looking for includes.
833   for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
834     if (*BufPtr == '#') {
835       if (++BufPtr == MainBufEnd)
836         return;
837       while (*BufPtr == ' ' || *BufPtr == '\t')
838         if (++BufPtr == MainBufEnd)
839           return;
840       if (!strncmp(BufPtr, "import", ImportLen)) {
841         // replace import with include
842         SourceLocation ImportLoc =
843           LocStart.getLocWithOffset(BufPtr-MainBufStart);
844         ReplaceText(ImportLoc, ImportLen, "include");
845         BufPtr += ImportLen;
846       }
847     }
848   }
849 }
850 
851 static void WriteInternalIvarName(const ObjCInterfaceDecl *IDecl,
852                                   ObjCIvarDecl *IvarDecl, std::string &Result) {
853   Result += "OBJC_IVAR_$_";
854   Result += IDecl->getName();
855   Result += "$";
856   Result += IvarDecl->getName();
857 }
858 
859 std::string
860 RewriteModernObjC::getIvarAccessString(ObjCIvarDecl *D) {
861   const ObjCInterfaceDecl *ClassDecl = D->getContainingInterface();
862 
863   // Build name of symbol holding ivar offset.
864   std::string IvarOffsetName;
865   if (D->isBitField())
866     ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
867   else
868     WriteInternalIvarName(ClassDecl, D, IvarOffsetName);
869 
870 
871   std::string S = "(*(";
872   QualType IvarT = D->getType();
873   if (D->isBitField())
874     IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
875 
876   if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
877     RecordDecl *RD = IvarT->getAs<RecordType>()->getDecl();
878     RD = RD->getDefinition();
879     if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
880       // decltype(((Foo_IMPL*)0)->bar) *
881       ObjCContainerDecl *CDecl =
882       dyn_cast<ObjCContainerDecl>(D->getDeclContext());
883       // ivar in class extensions requires special treatment.
884       if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
885         CDecl = CatDecl->getClassInterface();
886       std::string RecName = CDecl->getName();
887       RecName += "_IMPL";
888       RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
889                                           SourceLocation(), SourceLocation(),
890                                           &Context->Idents.get(RecName.c_str()));
891       QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
892       unsigned UnsignedIntSize =
893       static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
894       Expr *Zero = IntegerLiteral::Create(*Context,
895                                           llvm::APInt(UnsignedIntSize, 0),
896                                           Context->UnsignedIntTy, SourceLocation());
897       Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
898       ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
899                                               Zero);
900       FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
901                                         SourceLocation(),
902                                         &Context->Idents.get(D->getNameAsString()),
903                                         IvarT, nullptr,
904                                         /*BitWidth=*/nullptr, /*Mutable=*/true,
905                                         ICIS_NoInit);
906       MemberExpr *ME = new (Context) MemberExpr(PE, true, FD, SourceLocation(),
907                                                 FD->getType(), VK_LValue,
908                                                 OK_Ordinary);
909       IvarT = Context->getDecltypeType(ME, ME->getType());
910     }
911   }
912   convertObjCTypeToCStyleType(IvarT);
913   QualType castT = Context->getPointerType(IvarT);
914   std::string TypeString(castT.getAsString(Context->getPrintingPolicy()));
915   S += TypeString;
916   S += ")";
917 
918   // ((char *)self + IVAR_OFFSET_SYMBOL_NAME)
919   S += "((char *)self + ";
920   S += IvarOffsetName;
921   S += "))";
922   if (D->isBitField()) {
923     S += ".";
924     S += D->getNameAsString();
925   }
926   ReferencedIvars[const_cast<ObjCInterfaceDecl *>(ClassDecl)].insert(D);
927   return S;
928 }
929 
930 /// mustSynthesizeSetterGetterMethod - returns true if setter or getter has not
931 /// been found in the class implementation. In this case, it must be synthesized.
932 static bool mustSynthesizeSetterGetterMethod(ObjCImplementationDecl *IMP,
933                                              ObjCPropertyDecl *PD,
934                                              bool getter) {
935   return getter ? !IMP->getInstanceMethod(PD->getGetterName())
936                 : !IMP->getInstanceMethod(PD->getSetterName());
937 
938 }
939 
940 void RewriteModernObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
941                                           ObjCImplementationDecl *IMD,
942                                           ObjCCategoryImplDecl *CID) {
943   static bool objcGetPropertyDefined = false;
944   static bool objcSetPropertyDefined = false;
945   SourceLocation startGetterSetterLoc;
946 
947   if (PID->getLocStart().isValid()) {
948     SourceLocation startLoc = PID->getLocStart();
949     InsertText(startLoc, "// ");
950     const char *startBuf = SM->getCharacterData(startLoc);
951     assert((*startBuf == '@') && "bogus @synthesize location");
952     const char *semiBuf = strchr(startBuf, ';');
953     assert((*semiBuf == ';') && "@synthesize: can't find ';'");
954     startGetterSetterLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
955   }
956   else
957     startGetterSetterLoc = IMD ? IMD->getLocEnd() : CID->getLocEnd();
958 
959   if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
960     return; // FIXME: is this correct?
961 
962   // Generate the 'getter' function.
963   ObjCPropertyDecl *PD = PID->getPropertyDecl();
964   ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
965   assert(IMD && OID && "Synthesized ivars must be attached to @implementation");
966 
967   unsigned Attributes = PD->getPropertyAttributes();
968   if (mustSynthesizeSetterGetterMethod(IMD, PD, true /*getter*/)) {
969     bool GenGetProperty = !(Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) &&
970                           (Attributes & (ObjCPropertyDecl::OBJC_PR_retain |
971                                          ObjCPropertyDecl::OBJC_PR_copy));
972     std::string Getr;
973     if (GenGetProperty && !objcGetPropertyDefined) {
974       objcGetPropertyDefined = true;
975       // FIXME. Is this attribute correct in all cases?
976       Getr = "\nextern \"C\" __declspec(dllimport) "
977             "id objc_getProperty(id, SEL, long, bool);\n";
978     }
979     RewriteObjCMethodDecl(OID->getContainingInterface(),
980                           PD->getGetterMethodDecl(), Getr);
981     Getr += "{ ";
982     // Synthesize an explicit cast to gain access to the ivar.
983     // See objc-act.c:objc_synthesize_new_getter() for details.
984     if (GenGetProperty) {
985       // return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
986       Getr += "typedef ";
987       const FunctionType *FPRetType = nullptr;
988       RewriteTypeIntoString(PD->getGetterMethodDecl()->getReturnType(), Getr,
989                             FPRetType);
990       Getr += " _TYPE";
991       if (FPRetType) {
992         Getr += ")"; // close the precedence "scope" for "*".
993 
994         // Now, emit the argument types (if any).
995         if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
996           Getr += "(";
997           for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
998             if (i) Getr += ", ";
999             std::string ParamStr =
1000                 FT->getParamType(i).getAsString(Context->getPrintingPolicy());
1001             Getr += ParamStr;
1002           }
1003           if (FT->isVariadic()) {
1004             if (FT->getNumParams())
1005               Getr += ", ";
1006             Getr += "...";
1007           }
1008           Getr += ")";
1009         } else
1010           Getr += "()";
1011       }
1012       Getr += ";\n";
1013       Getr += "return (_TYPE)";
1014       Getr += "objc_getProperty(self, _cmd, ";
1015       RewriteIvarOffsetComputation(OID, Getr);
1016       Getr += ", 1)";
1017     }
1018     else
1019       Getr += "return " + getIvarAccessString(OID);
1020     Getr += "; }";
1021     InsertText(startGetterSetterLoc, Getr);
1022   }
1023 
1024   if (PD->isReadOnly() ||
1025       !mustSynthesizeSetterGetterMethod(IMD, PD, false /*setter*/))
1026     return;
1027 
1028   // Generate the 'setter' function.
1029   std::string Setr;
1030   bool GenSetProperty = Attributes & (ObjCPropertyDecl::OBJC_PR_retain |
1031                                       ObjCPropertyDecl::OBJC_PR_copy);
1032   if (GenSetProperty && !objcSetPropertyDefined) {
1033     objcSetPropertyDefined = true;
1034     // FIXME. Is this attribute correct in all cases?
1035     Setr = "\nextern \"C\" __declspec(dllimport) "
1036     "void objc_setProperty (id, SEL, long, id, bool, bool);\n";
1037   }
1038 
1039   RewriteObjCMethodDecl(OID->getContainingInterface(),
1040                         PD->getSetterMethodDecl(), Setr);
1041   Setr += "{ ";
1042   // Synthesize an explicit cast to initialize the ivar.
1043   // See objc-act.c:objc_synthesize_new_setter() for details.
1044   if (GenSetProperty) {
1045     Setr += "objc_setProperty (self, _cmd, ";
1046     RewriteIvarOffsetComputation(OID, Setr);
1047     Setr += ", (id)";
1048     Setr += PD->getName();
1049     Setr += ", ";
1050     if (Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic)
1051       Setr += "0, ";
1052     else
1053       Setr += "1, ";
1054     if (Attributes & ObjCPropertyDecl::OBJC_PR_copy)
1055       Setr += "1)";
1056     else
1057       Setr += "0)";
1058   }
1059   else {
1060     Setr += getIvarAccessString(OID) + " = ";
1061     Setr += PD->getName();
1062   }
1063   Setr += "; }\n";
1064   InsertText(startGetterSetterLoc, Setr);
1065 }
1066 
1067 static void RewriteOneForwardClassDecl(ObjCInterfaceDecl *ForwardDecl,
1068                                        std::string &typedefString) {
1069   typedefString += "\n#ifndef _REWRITER_typedef_";
1070   typedefString += ForwardDecl->getNameAsString();
1071   typedefString += "\n";
1072   typedefString += "#define _REWRITER_typedef_";
1073   typedefString += ForwardDecl->getNameAsString();
1074   typedefString += "\n";
1075   typedefString += "typedef struct objc_object ";
1076   typedefString += ForwardDecl->getNameAsString();
1077   // typedef struct { } _objc_exc_Classname;
1078   typedefString += ";\ntypedef struct {} _objc_exc_";
1079   typedefString += ForwardDecl->getNameAsString();
1080   typedefString += ";\n#endif\n";
1081 }
1082 
1083 void RewriteModernObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
1084                                               const std::string &typedefString) {
1085     SourceLocation startLoc = ClassDecl->getLocStart();
1086     const char *startBuf = SM->getCharacterData(startLoc);
1087     const char *semiPtr = strchr(startBuf, ';');
1088     // Replace the @class with typedefs corresponding to the classes.
1089     ReplaceText(startLoc, semiPtr-startBuf+1, typedefString);
1090 }
1091 
1092 void RewriteModernObjC::RewriteForwardClassDecl(DeclGroupRef D) {
1093   std::string typedefString;
1094   for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
1095     if (ObjCInterfaceDecl *ForwardDecl = dyn_cast<ObjCInterfaceDecl>(*I)) {
1096       if (I == D.begin()) {
1097         // Translate to typedef's that forward reference structs with the same name
1098         // as the class. As a convenience, we include the original declaration
1099         // as a comment.
1100         typedefString += "// @class ";
1101         typedefString += ForwardDecl->getNameAsString();
1102         typedefString += ";";
1103       }
1104       RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1105     }
1106     else
1107       HandleTopLevelSingleDecl(*I);
1108   }
1109   DeclGroupRef::iterator I = D.begin();
1110   RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(*I), typedefString);
1111 }
1112 
1113 void RewriteModernObjC::RewriteForwardClassDecl(
1114                                 const SmallVectorImpl<Decl *> &D) {
1115   std::string typedefString;
1116   for (unsigned i = 0; i < D.size(); i++) {
1117     ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(D[i]);
1118     if (i == 0) {
1119       typedefString += "// @class ";
1120       typedefString += ForwardDecl->getNameAsString();
1121       typedefString += ";";
1122     }
1123     RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1124   }
1125   RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(D[0]), typedefString);
1126 }
1127 
1128 void RewriteModernObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
1129   // When method is a synthesized one, such as a getter/setter there is
1130   // nothing to rewrite.
1131   if (Method->isImplicit())
1132     return;
1133   SourceLocation LocStart = Method->getLocStart();
1134   SourceLocation LocEnd = Method->getLocEnd();
1135 
1136   if (SM->getExpansionLineNumber(LocEnd) >
1137       SM->getExpansionLineNumber(LocStart)) {
1138     InsertText(LocStart, "#if 0\n");
1139     ReplaceText(LocEnd, 1, ";\n#endif\n");
1140   } else {
1141     InsertText(LocStart, "// ");
1142   }
1143 }
1144 
1145 void RewriteModernObjC::RewriteProperty(ObjCPropertyDecl *prop) {
1146   SourceLocation Loc = prop->getAtLoc();
1147 
1148   ReplaceText(Loc, 0, "// ");
1149   // FIXME: handle properties that are declared across multiple lines.
1150 }
1151 
1152 void RewriteModernObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
1153   SourceLocation LocStart = CatDecl->getLocStart();
1154 
1155   // FIXME: handle category headers that are declared across multiple lines.
1156   if (CatDecl->getIvarRBraceLoc().isValid()) {
1157     ReplaceText(LocStart, 1, "/** ");
1158     ReplaceText(CatDecl->getIvarRBraceLoc(), 1, "**/ ");
1159   }
1160   else {
1161     ReplaceText(LocStart, 0, "// ");
1162   }
1163 
1164   for (auto *I : CatDecl->properties())
1165     RewriteProperty(I);
1166 
1167   for (auto *I : CatDecl->instance_methods())
1168     RewriteMethodDeclaration(I);
1169   for (auto *I : CatDecl->class_methods())
1170     RewriteMethodDeclaration(I);
1171 
1172   // Lastly, comment out the @end.
1173   ReplaceText(CatDecl->getAtEndRange().getBegin(),
1174               strlen("@end"), "/* @end */\n");
1175 }
1176 
1177 void RewriteModernObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
1178   SourceLocation LocStart = PDecl->getLocStart();
1179   assert(PDecl->isThisDeclarationADefinition());
1180 
1181   // FIXME: handle protocol headers that are declared across multiple lines.
1182   ReplaceText(LocStart, 0, "// ");
1183 
1184   for (auto *I : PDecl->instance_methods())
1185     RewriteMethodDeclaration(I);
1186   for (auto *I : PDecl->class_methods())
1187     RewriteMethodDeclaration(I);
1188   for (auto *I : PDecl->properties())
1189     RewriteProperty(I);
1190 
1191   // Lastly, comment out the @end.
1192   SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
1193   ReplaceText(LocEnd, strlen("@end"), "/* @end */\n");
1194 
1195   // Must comment out @optional/@required
1196   const char *startBuf = SM->getCharacterData(LocStart);
1197   const char *endBuf = SM->getCharacterData(LocEnd);
1198   for (const char *p = startBuf; p < endBuf; p++) {
1199     if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
1200       SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
1201       ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
1202 
1203     }
1204     else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
1205       SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
1206       ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
1207 
1208     }
1209   }
1210 }
1211 
1212 void RewriteModernObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
1213   SourceLocation LocStart = (*D.begin())->getLocStart();
1214   if (LocStart.isInvalid())
1215     llvm_unreachable("Invalid SourceLocation");
1216   // FIXME: handle forward protocol that are declared across multiple lines.
1217   ReplaceText(LocStart, 0, "// ");
1218 }
1219 
1220 void
1221 RewriteModernObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
1222   SourceLocation LocStart = DG[0]->getLocStart();
1223   if (LocStart.isInvalid())
1224     llvm_unreachable("Invalid SourceLocation");
1225   // FIXME: handle forward protocol that are declared across multiple lines.
1226   ReplaceText(LocStart, 0, "// ");
1227 }
1228 
1229 void
1230 RewriteModernObjC::RewriteLinkageSpec(LinkageSpecDecl *LSD) {
1231   SourceLocation LocStart = LSD->getExternLoc();
1232   if (LocStart.isInvalid())
1233     llvm_unreachable("Invalid extern SourceLocation");
1234 
1235   ReplaceText(LocStart, 0, "// ");
1236   if (!LSD->hasBraces())
1237     return;
1238   // FIXME. We don't rewrite well if '{' is not on same line as 'extern'.
1239   SourceLocation LocRBrace = LSD->getRBraceLoc();
1240   if (LocRBrace.isInvalid())
1241     llvm_unreachable("Invalid rbrace SourceLocation");
1242   ReplaceText(LocRBrace, 0, "// ");
1243 }
1244 
1245 void RewriteModernObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
1246                                         const FunctionType *&FPRetType) {
1247   if (T->isObjCQualifiedIdType())
1248     ResultStr += "id";
1249   else if (T->isFunctionPointerType() ||
1250            T->isBlockPointerType()) {
1251     // needs special handling, since pointer-to-functions have special
1252     // syntax (where a decaration models use).
1253     QualType retType = T;
1254     QualType PointeeTy;
1255     if (const PointerType* PT = retType->getAs<PointerType>())
1256       PointeeTy = PT->getPointeeType();
1257     else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
1258       PointeeTy = BPT->getPointeeType();
1259     if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
1260       ResultStr +=
1261           FPRetType->getReturnType().getAsString(Context->getPrintingPolicy());
1262       ResultStr += "(*";
1263     }
1264   } else
1265     ResultStr += T.getAsString(Context->getPrintingPolicy());
1266 }
1267 
1268 void RewriteModernObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
1269                                         ObjCMethodDecl *OMD,
1270                                         std::string &ResultStr) {
1271   //fprintf(stderr,"In RewriteObjCMethodDecl\n");
1272   const FunctionType *FPRetType = nullptr;
1273   ResultStr += "\nstatic ";
1274   RewriteTypeIntoString(OMD->getReturnType(), ResultStr, FPRetType);
1275   ResultStr += " ";
1276 
1277   // Unique method name
1278   std::string NameStr;
1279 
1280   if (OMD->isInstanceMethod())
1281     NameStr += "_I_";
1282   else
1283     NameStr += "_C_";
1284 
1285   NameStr += IDecl->getNameAsString();
1286   NameStr += "_";
1287 
1288   if (ObjCCategoryImplDecl *CID =
1289       dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
1290     NameStr += CID->getNameAsString();
1291     NameStr += "_";
1292   }
1293   // Append selector names, replacing ':' with '_'
1294   {
1295     std::string selString = OMD->getSelector().getAsString();
1296     int len = selString.size();
1297     for (int i = 0; i < len; i++)
1298       if (selString[i] == ':')
1299         selString[i] = '_';
1300     NameStr += selString;
1301   }
1302   // Remember this name for metadata emission
1303   MethodInternalNames[OMD] = NameStr;
1304   ResultStr += NameStr;
1305 
1306   // Rewrite arguments
1307   ResultStr += "(";
1308 
1309   // invisible arguments
1310   if (OMD->isInstanceMethod()) {
1311     QualType selfTy = Context->getObjCInterfaceType(IDecl);
1312     selfTy = Context->getPointerType(selfTy);
1313     if (!LangOpts.MicrosoftExt) {
1314       if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
1315         ResultStr += "struct ";
1316     }
1317     // When rewriting for Microsoft, explicitly omit the structure name.
1318     ResultStr += IDecl->getNameAsString();
1319     ResultStr += " *";
1320   }
1321   else
1322     ResultStr += Context->getObjCClassType().getAsString(
1323       Context->getPrintingPolicy());
1324 
1325   ResultStr += " self, ";
1326   ResultStr += Context->getObjCSelType().getAsString(Context->getPrintingPolicy());
1327   ResultStr += " _cmd";
1328 
1329   // Method arguments.
1330   for (const auto *PDecl : OMD->params()) {
1331     ResultStr += ", ";
1332     if (PDecl->getType()->isObjCQualifiedIdType()) {
1333       ResultStr += "id ";
1334       ResultStr += PDecl->getNameAsString();
1335     } else {
1336       std::string Name = PDecl->getNameAsString();
1337       QualType QT = PDecl->getType();
1338       // Make sure we convert "t (^)(...)" to "t (*)(...)".
1339       (void)convertBlockPointerToFunctionPointer(QT);
1340       QT.getAsStringInternal(Name, Context->getPrintingPolicy());
1341       ResultStr += Name;
1342     }
1343   }
1344   if (OMD->isVariadic())
1345     ResultStr += ", ...";
1346   ResultStr += ") ";
1347 
1348   if (FPRetType) {
1349     ResultStr += ")"; // close the precedence "scope" for "*".
1350 
1351     // Now, emit the argument types (if any).
1352     if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
1353       ResultStr += "(";
1354       for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
1355         if (i) ResultStr += ", ";
1356         std::string ParamStr =
1357             FT->getParamType(i).getAsString(Context->getPrintingPolicy());
1358         ResultStr += ParamStr;
1359       }
1360       if (FT->isVariadic()) {
1361         if (FT->getNumParams())
1362           ResultStr += ", ";
1363         ResultStr += "...";
1364       }
1365       ResultStr += ")";
1366     } else {
1367       ResultStr += "()";
1368     }
1369   }
1370 }
1371 void RewriteModernObjC::RewriteImplementationDecl(Decl *OID) {
1372   ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
1373   ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
1374 
1375   if (IMD) {
1376     if (IMD->getIvarRBraceLoc().isValid()) {
1377       ReplaceText(IMD->getLocStart(), 1, "/** ");
1378       ReplaceText(IMD->getIvarRBraceLoc(), 1, "**/ ");
1379     }
1380     else {
1381       InsertText(IMD->getLocStart(), "// ");
1382     }
1383   }
1384   else
1385     InsertText(CID->getLocStart(), "// ");
1386 
1387   for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
1388     std::string ResultStr;
1389     RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1390     SourceLocation LocStart = OMD->getLocStart();
1391     SourceLocation LocEnd = OMD->getCompoundBody()->getLocStart();
1392 
1393     const char *startBuf = SM->getCharacterData(LocStart);
1394     const char *endBuf = SM->getCharacterData(LocEnd);
1395     ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1396   }
1397 
1398   for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
1399     std::string ResultStr;
1400     RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1401     SourceLocation LocStart = OMD->getLocStart();
1402     SourceLocation LocEnd = OMD->getCompoundBody()->getLocStart();
1403 
1404     const char *startBuf = SM->getCharacterData(LocStart);
1405     const char *endBuf = SM->getCharacterData(LocEnd);
1406     ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1407   }
1408   for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
1409     RewritePropertyImplDecl(I, IMD, CID);
1410 
1411   InsertText(IMD ? IMD->getLocEnd() : CID->getLocEnd(), "// ");
1412 }
1413 
1414 void RewriteModernObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
1415   // Do not synthesize more than once.
1416   if (ObjCSynthesizedStructs.count(ClassDecl))
1417     return;
1418   // Make sure super class's are written before current class is written.
1419   ObjCInterfaceDecl *SuperClass = ClassDecl->getSuperClass();
1420   while (SuperClass) {
1421     RewriteInterfaceDecl(SuperClass);
1422     SuperClass = SuperClass->getSuperClass();
1423   }
1424   std::string ResultStr;
1425   if (!ObjCWrittenInterfaces.count(ClassDecl->getCanonicalDecl())) {
1426     // we haven't seen a forward decl - generate a typedef.
1427     RewriteOneForwardClassDecl(ClassDecl, ResultStr);
1428     RewriteIvarOffsetSymbols(ClassDecl, ResultStr);
1429 
1430     RewriteObjCInternalStruct(ClassDecl, ResultStr);
1431     // Mark this typedef as having been written into its c++ equivalent.
1432     ObjCWrittenInterfaces.insert(ClassDecl->getCanonicalDecl());
1433 
1434     for (auto *I : ClassDecl->properties())
1435       RewriteProperty(I);
1436     for (auto *I : ClassDecl->instance_methods())
1437       RewriteMethodDeclaration(I);
1438     for (auto *I : ClassDecl->class_methods())
1439       RewriteMethodDeclaration(I);
1440 
1441     // Lastly, comment out the @end.
1442     ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
1443                 "/* @end */\n");
1444   }
1445 }
1446 
1447 Stmt *RewriteModernObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
1448   SourceRange OldRange = PseudoOp->getSourceRange();
1449 
1450   // We just magically know some things about the structure of this
1451   // expression.
1452   ObjCMessageExpr *OldMsg =
1453     cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
1454                             PseudoOp->getNumSemanticExprs() - 1));
1455 
1456   // Because the rewriter doesn't allow us to rewrite rewritten code,
1457   // we need to suppress rewriting the sub-statements.
1458   Expr *Base;
1459   SmallVector<Expr*, 2> Args;
1460   {
1461     DisableReplaceStmtScope S(*this);
1462 
1463     // Rebuild the base expression if we have one.
1464     Base = nullptr;
1465     if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1466       Base = OldMsg->getInstanceReceiver();
1467       Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1468       Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1469     }
1470 
1471     unsigned numArgs = OldMsg->getNumArgs();
1472     for (unsigned i = 0; i < numArgs; i++) {
1473       Expr *Arg = OldMsg->getArg(i);
1474       if (isa<OpaqueValueExpr>(Arg))
1475         Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1476       Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1477       Args.push_back(Arg);
1478     }
1479   }
1480 
1481   // TODO: avoid this copy.
1482   SmallVector<SourceLocation, 1> SelLocs;
1483   OldMsg->getSelectorLocs(SelLocs);
1484 
1485   ObjCMessageExpr *NewMsg = nullptr;
1486   switch (OldMsg->getReceiverKind()) {
1487   case ObjCMessageExpr::Class:
1488     NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1489                                      OldMsg->getValueKind(),
1490                                      OldMsg->getLeftLoc(),
1491                                      OldMsg->getClassReceiverTypeInfo(),
1492                                      OldMsg->getSelector(),
1493                                      SelLocs,
1494                                      OldMsg->getMethodDecl(),
1495                                      Args,
1496                                      OldMsg->getRightLoc(),
1497                                      OldMsg->isImplicit());
1498     break;
1499 
1500   case ObjCMessageExpr::Instance:
1501     NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1502                                      OldMsg->getValueKind(),
1503                                      OldMsg->getLeftLoc(),
1504                                      Base,
1505                                      OldMsg->getSelector(),
1506                                      SelLocs,
1507                                      OldMsg->getMethodDecl(),
1508                                      Args,
1509                                      OldMsg->getRightLoc(),
1510                                      OldMsg->isImplicit());
1511     break;
1512 
1513   case ObjCMessageExpr::SuperClass:
1514   case ObjCMessageExpr::SuperInstance:
1515     NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1516                                      OldMsg->getValueKind(),
1517                                      OldMsg->getLeftLoc(),
1518                                      OldMsg->getSuperLoc(),
1519                  OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1520                                      OldMsg->getSuperType(),
1521                                      OldMsg->getSelector(),
1522                                      SelLocs,
1523                                      OldMsg->getMethodDecl(),
1524                                      Args,
1525                                      OldMsg->getRightLoc(),
1526                                      OldMsg->isImplicit());
1527     break;
1528   }
1529 
1530   Stmt *Replacement = SynthMessageExpr(NewMsg);
1531   ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1532   return Replacement;
1533 }
1534 
1535 Stmt *RewriteModernObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
1536   SourceRange OldRange = PseudoOp->getSourceRange();
1537 
1538   // We just magically know some things about the structure of this
1539   // expression.
1540   ObjCMessageExpr *OldMsg =
1541     cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
1542 
1543   // Because the rewriter doesn't allow us to rewrite rewritten code,
1544   // we need to suppress rewriting the sub-statements.
1545   Expr *Base = nullptr;
1546   SmallVector<Expr*, 1> Args;
1547   {
1548     DisableReplaceStmtScope S(*this);
1549     // Rebuild the base expression if we have one.
1550     if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1551       Base = OldMsg->getInstanceReceiver();
1552       Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1553       Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1554     }
1555     unsigned numArgs = OldMsg->getNumArgs();
1556     for (unsigned i = 0; i < numArgs; i++) {
1557       Expr *Arg = OldMsg->getArg(i);
1558       if (isa<OpaqueValueExpr>(Arg))
1559         Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1560       Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1561       Args.push_back(Arg);
1562     }
1563   }
1564 
1565   // Intentionally empty.
1566   SmallVector<SourceLocation, 1> SelLocs;
1567 
1568   ObjCMessageExpr *NewMsg = nullptr;
1569   switch (OldMsg->getReceiverKind()) {
1570   case ObjCMessageExpr::Class:
1571     NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1572                                      OldMsg->getValueKind(),
1573                                      OldMsg->getLeftLoc(),
1574                                      OldMsg->getClassReceiverTypeInfo(),
1575                                      OldMsg->getSelector(),
1576                                      SelLocs,
1577                                      OldMsg->getMethodDecl(),
1578                                      Args,
1579                                      OldMsg->getRightLoc(),
1580                                      OldMsg->isImplicit());
1581     break;
1582 
1583   case ObjCMessageExpr::Instance:
1584     NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1585                                      OldMsg->getValueKind(),
1586                                      OldMsg->getLeftLoc(),
1587                                      Base,
1588                                      OldMsg->getSelector(),
1589                                      SelLocs,
1590                                      OldMsg->getMethodDecl(),
1591                                      Args,
1592                                      OldMsg->getRightLoc(),
1593                                      OldMsg->isImplicit());
1594     break;
1595 
1596   case ObjCMessageExpr::SuperClass:
1597   case ObjCMessageExpr::SuperInstance:
1598     NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1599                                      OldMsg->getValueKind(),
1600                                      OldMsg->getLeftLoc(),
1601                                      OldMsg->getSuperLoc(),
1602                  OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1603                                      OldMsg->getSuperType(),
1604                                      OldMsg->getSelector(),
1605                                      SelLocs,
1606                                      OldMsg->getMethodDecl(),
1607                                      Args,
1608                                      OldMsg->getRightLoc(),
1609                                      OldMsg->isImplicit());
1610     break;
1611   }
1612 
1613   Stmt *Replacement = SynthMessageExpr(NewMsg);
1614   ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1615   return Replacement;
1616 }
1617 
1618 /// SynthCountByEnumWithState - To print:
1619 /// ((NSUInteger (*)
1620 ///  (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1621 ///  (void *)objc_msgSend)((id)l_collection,
1622 ///                        sel_registerName(
1623 ///                          "countByEnumeratingWithState:objects:count:"),
1624 ///                        &enumState,
1625 ///                        (id *)__rw_items, (NSUInteger)16)
1626 ///
1627 void RewriteModernObjC::SynthCountByEnumWithState(std::string &buf) {
1628   buf += "((_WIN_NSUInteger (*) (id, SEL, struct __objcFastEnumerationState *, "
1629   "id *, _WIN_NSUInteger))(void *)objc_msgSend)";
1630   buf += "\n\t\t";
1631   buf += "((id)l_collection,\n\t\t";
1632   buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
1633   buf += "\n\t\t";
1634   buf += "&enumState, "
1635          "(id *)__rw_items, (_WIN_NSUInteger)16)";
1636 }
1637 
1638 /// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
1639 /// statement to exit to its outer synthesized loop.
1640 ///
1641 Stmt *RewriteModernObjC::RewriteBreakStmt(BreakStmt *S) {
1642   if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
1643     return S;
1644   // replace break with goto __break_label
1645   std::string buf;
1646 
1647   SourceLocation startLoc = S->getLocStart();
1648   buf = "goto __break_label_";
1649   buf += utostr(ObjCBcLabelNo.back());
1650   ReplaceText(startLoc, strlen("break"), buf);
1651 
1652   return nullptr;
1653 }
1654 
1655 void RewriteModernObjC::ConvertSourceLocationToLineDirective(
1656                                           SourceLocation Loc,
1657                                           std::string &LineString) {
1658   if (Loc.isFileID() && GenerateLineInfo) {
1659     LineString += "\n#line ";
1660     PresumedLoc PLoc = SM->getPresumedLoc(Loc);
1661     LineString += utostr(PLoc.getLine());
1662     LineString += " \"";
1663     LineString += Lexer::Stringify(PLoc.getFilename());
1664     LineString += "\"\n";
1665   }
1666 }
1667 
1668 /// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
1669 /// statement to continue with its inner synthesized loop.
1670 ///
1671 Stmt *RewriteModernObjC::RewriteContinueStmt(ContinueStmt *S) {
1672   if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
1673     return S;
1674   // replace continue with goto __continue_label
1675   std::string buf;
1676 
1677   SourceLocation startLoc = S->getLocStart();
1678   buf = "goto __continue_label_";
1679   buf += utostr(ObjCBcLabelNo.back());
1680   ReplaceText(startLoc, strlen("continue"), buf);
1681 
1682   return nullptr;
1683 }
1684 
1685 /// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
1686 ///  It rewrites:
1687 /// for ( type elem in collection) { stmts; }
1688 
1689 /// Into:
1690 /// {
1691 ///   type elem;
1692 ///   struct __objcFastEnumerationState enumState = { 0 };
1693 ///   id __rw_items[16];
1694 ///   id l_collection = (id)collection;
1695 ///   NSUInteger limit = [l_collection countByEnumeratingWithState:&enumState
1696 ///                                       objects:__rw_items count:16];
1697 /// if (limit) {
1698 ///   unsigned long startMutations = *enumState.mutationsPtr;
1699 ///   do {
1700 ///        unsigned long counter = 0;
1701 ///        do {
1702 ///             if (startMutations != *enumState.mutationsPtr)
1703 ///               objc_enumerationMutation(l_collection);
1704 ///             elem = (type)enumState.itemsPtr[counter++];
1705 ///             stmts;
1706 ///             __continue_label: ;
1707 ///        } while (counter < limit);
1708 ///   } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1709 ///                                  objects:__rw_items count:16]));
1710 ///   elem = nil;
1711 ///   __break_label: ;
1712 ///  }
1713 ///  else
1714 ///       elem = nil;
1715 ///  }
1716 ///
1717 Stmt *RewriteModernObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
1718                                                 SourceLocation OrigEnd) {
1719   assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
1720   assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
1721          "ObjCForCollectionStmt Statement stack mismatch");
1722   assert(!ObjCBcLabelNo.empty() &&
1723          "ObjCForCollectionStmt - Label No stack empty");
1724 
1725   SourceLocation startLoc = S->getLocStart();
1726   const char *startBuf = SM->getCharacterData(startLoc);
1727   StringRef elementName;
1728   std::string elementTypeAsString;
1729   std::string buf;
1730   // line directive first.
1731   SourceLocation ForEachLoc = S->getForLoc();
1732   ConvertSourceLocationToLineDirective(ForEachLoc, buf);
1733   buf += "{\n\t";
1734   if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
1735     // type elem;
1736     NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
1737     QualType ElementType = cast<ValueDecl>(D)->getType();
1738     if (ElementType->isObjCQualifiedIdType() ||
1739         ElementType->isObjCQualifiedInterfaceType())
1740       // Simply use 'id' for all qualified types.
1741       elementTypeAsString = "id";
1742     else
1743       elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
1744     buf += elementTypeAsString;
1745     buf += " ";
1746     elementName = D->getName();
1747     buf += elementName;
1748     buf += ";\n\t";
1749   }
1750   else {
1751     DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
1752     elementName = DR->getDecl()->getName();
1753     ValueDecl *VD = cast<ValueDecl>(DR->getDecl());
1754     if (VD->getType()->isObjCQualifiedIdType() ||
1755         VD->getType()->isObjCQualifiedInterfaceType())
1756       // Simply use 'id' for all qualified types.
1757       elementTypeAsString = "id";
1758     else
1759       elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
1760   }
1761 
1762   // struct __objcFastEnumerationState enumState = { 0 };
1763   buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
1764   // id __rw_items[16];
1765   buf += "id __rw_items[16];\n\t";
1766   // id l_collection = (id)
1767   buf += "id l_collection = (id)";
1768   // Find start location of 'collection' the hard way!
1769   const char *startCollectionBuf = startBuf;
1770   startCollectionBuf += 3;  // skip 'for'
1771   startCollectionBuf = strchr(startCollectionBuf, '(');
1772   startCollectionBuf++; // skip '('
1773   // find 'in' and skip it.
1774   while (*startCollectionBuf != ' ' ||
1775          *(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
1776          (*(startCollectionBuf+3) != ' ' &&
1777           *(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
1778     startCollectionBuf++;
1779   startCollectionBuf += 3;
1780 
1781   // Replace: "for (type element in" with string constructed thus far.
1782   ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
1783   // Replace ')' in for '(' type elem in collection ')' with ';'
1784   SourceLocation rightParenLoc = S->getRParenLoc();
1785   const char *rparenBuf = SM->getCharacterData(rightParenLoc);
1786   SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
1787   buf = ";\n\t";
1788 
1789   // unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
1790   //                                   objects:__rw_items count:16];
1791   // which is synthesized into:
1792   // NSUInteger limit =
1793   // ((NSUInteger (*)
1794   //  (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1795   //  (void *)objc_msgSend)((id)l_collection,
1796   //                        sel_registerName(
1797   //                          "countByEnumeratingWithState:objects:count:"),
1798   //                        (struct __objcFastEnumerationState *)&state,
1799   //                        (id *)__rw_items, (NSUInteger)16);
1800   buf += "_WIN_NSUInteger limit =\n\t\t";
1801   SynthCountByEnumWithState(buf);
1802   buf += ";\n\t";
1803   /// if (limit) {
1804   ///   unsigned long startMutations = *enumState.mutationsPtr;
1805   ///   do {
1806   ///        unsigned long counter = 0;
1807   ///        do {
1808   ///             if (startMutations != *enumState.mutationsPtr)
1809   ///               objc_enumerationMutation(l_collection);
1810   ///             elem = (type)enumState.itemsPtr[counter++];
1811   buf += "if (limit) {\n\t";
1812   buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
1813   buf += "do {\n\t\t";
1814   buf += "unsigned long counter = 0;\n\t\t";
1815   buf += "do {\n\t\t\t";
1816   buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
1817   buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
1818   buf += elementName;
1819   buf += " = (";
1820   buf += elementTypeAsString;
1821   buf += ")enumState.itemsPtr[counter++];";
1822   // Replace ')' in for '(' type elem in collection ')' with all of these.
1823   ReplaceText(lparenLoc, 1, buf);
1824 
1825   ///            __continue_label: ;
1826   ///        } while (counter < limit);
1827   ///   } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1828   ///                                  objects:__rw_items count:16]));
1829   ///   elem = nil;
1830   ///   __break_label: ;
1831   ///  }
1832   ///  else
1833   ///       elem = nil;
1834   ///  }
1835   ///
1836   buf = ";\n\t";
1837   buf += "__continue_label_";
1838   buf += utostr(ObjCBcLabelNo.back());
1839   buf += ": ;";
1840   buf += "\n\t\t";
1841   buf += "} while (counter < limit);\n\t";
1842   buf += "} while ((limit = ";
1843   SynthCountByEnumWithState(buf);
1844   buf += "));\n\t";
1845   buf += elementName;
1846   buf += " = ((";
1847   buf += elementTypeAsString;
1848   buf += ")0);\n\t";
1849   buf += "__break_label_";
1850   buf += utostr(ObjCBcLabelNo.back());
1851   buf += ": ;\n\t";
1852   buf += "}\n\t";
1853   buf += "else\n\t\t";
1854   buf += elementName;
1855   buf += " = ((";
1856   buf += elementTypeAsString;
1857   buf += ")0);\n\t";
1858   buf += "}\n";
1859 
1860   // Insert all these *after* the statement body.
1861   // FIXME: If this should support Obj-C++, support CXXTryStmt
1862   if (isa<CompoundStmt>(S->getBody())) {
1863     SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
1864     InsertText(endBodyLoc, buf);
1865   } else {
1866     /* Need to treat single statements specially. For example:
1867      *
1868      *     for (A *a in b) if (stuff()) break;
1869      *     for (A *a in b) xxxyy;
1870      *
1871      * The following code simply scans ahead to the semi to find the actual end.
1872      */
1873     const char *stmtBuf = SM->getCharacterData(OrigEnd);
1874     const char *semiBuf = strchr(stmtBuf, ';');
1875     assert(semiBuf && "Can't find ';'");
1876     SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
1877     InsertText(endBodyLoc, buf);
1878   }
1879   Stmts.pop_back();
1880   ObjCBcLabelNo.pop_back();
1881   return nullptr;
1882 }
1883 
1884 static void Write_RethrowObject(std::string &buf) {
1885   buf += "{ struct _FIN { _FIN(id reth) : rethrow(reth) {}\n";
1886   buf += "\t~_FIN() { if (rethrow) objc_exception_throw(rethrow); }\n";
1887   buf += "\tid rethrow;\n";
1888   buf += "\t} _fin_force_rethow(_rethrow);";
1889 }
1890 
1891 /// RewriteObjCSynchronizedStmt -
1892 /// This routine rewrites @synchronized(expr) stmt;
1893 /// into:
1894 /// objc_sync_enter(expr);
1895 /// @try stmt @finally { objc_sync_exit(expr); }
1896 ///
1897 Stmt *RewriteModernObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
1898   // Get the start location and compute the semi location.
1899   SourceLocation startLoc = S->getLocStart();
1900   const char *startBuf = SM->getCharacterData(startLoc);
1901 
1902   assert((*startBuf == '@') && "bogus @synchronized location");
1903 
1904   std::string buf;
1905   SourceLocation SynchLoc = S->getAtSynchronizedLoc();
1906   ConvertSourceLocationToLineDirective(SynchLoc, buf);
1907   buf += "{ id _rethrow = 0; id _sync_obj = (id)";
1908 
1909   const char *lparenBuf = startBuf;
1910   while (*lparenBuf != '(') lparenBuf++;
1911   ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
1912 
1913   buf = "; objc_sync_enter(_sync_obj);\n";
1914   buf += "try {\n\tstruct _SYNC_EXIT { _SYNC_EXIT(id arg) : sync_exit(arg) {}";
1915   buf += "\n\t~_SYNC_EXIT() {objc_sync_exit(sync_exit);}";
1916   buf += "\n\tid sync_exit;";
1917   buf += "\n\t} _sync_exit(_sync_obj);\n";
1918 
1919   // We can't use S->getSynchExpr()->getLocEnd() to find the end location, since
1920   // the sync expression is typically a message expression that's already
1921   // been rewritten! (which implies the SourceLocation's are invalid).
1922   SourceLocation RParenExprLoc = S->getSynchBody()->getLocStart();
1923   const char *RParenExprLocBuf = SM->getCharacterData(RParenExprLoc);
1924   while (*RParenExprLocBuf != ')') RParenExprLocBuf--;
1925   RParenExprLoc = startLoc.getLocWithOffset(RParenExprLocBuf-startBuf);
1926 
1927   SourceLocation LBranceLoc = S->getSynchBody()->getLocStart();
1928   const char *LBraceLocBuf = SM->getCharacterData(LBranceLoc);
1929   assert (*LBraceLocBuf == '{');
1930   ReplaceText(RParenExprLoc, (LBraceLocBuf - SM->getCharacterData(RParenExprLoc) + 1), buf);
1931 
1932   SourceLocation startRBraceLoc = S->getSynchBody()->getLocEnd();
1933   assert((*SM->getCharacterData(startRBraceLoc) == '}') &&
1934          "bogus @synchronized block");
1935 
1936   buf = "} catch (id e) {_rethrow = e;}\n";
1937   Write_RethrowObject(buf);
1938   buf += "}\n";
1939   buf += "}\n";
1940 
1941   ReplaceText(startRBraceLoc, 1, buf);
1942 
1943   return nullptr;
1944 }
1945 
1946 void RewriteModernObjC::WarnAboutReturnGotoStmts(Stmt *S)
1947 {
1948   // Perform a bottom up traversal of all children.
1949   for (Stmt::child_range CI = S->children(); CI; ++CI)
1950     if (*CI)
1951       WarnAboutReturnGotoStmts(*CI);
1952 
1953   if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
1954     Diags.Report(Context->getFullLoc(S->getLocStart()),
1955                  TryFinallyContainsReturnDiag);
1956   }
1957   return;
1958 }
1959 
1960 Stmt *RewriteModernObjC::RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt  *S) {
1961   SourceLocation startLoc = S->getAtLoc();
1962   ReplaceText(startLoc, strlen("@autoreleasepool"), "/* @autoreleasepool */");
1963   ReplaceText(S->getSubStmt()->getLocStart(), 1,
1964               "{ __AtAutoreleasePool __autoreleasepool; ");
1965 
1966   return nullptr;
1967 }
1968 
1969 Stmt *RewriteModernObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
1970   ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt();
1971   bool noCatch = S->getNumCatchStmts() == 0;
1972   std::string buf;
1973   SourceLocation TryLocation = S->getAtTryLoc();
1974   ConvertSourceLocationToLineDirective(TryLocation, buf);
1975 
1976   if (finalStmt) {
1977     if (noCatch)
1978       buf += "{ id volatile _rethrow = 0;\n";
1979     else {
1980       buf += "{ id volatile _rethrow = 0;\ntry {\n";
1981     }
1982   }
1983   // Get the start location and compute the semi location.
1984   SourceLocation startLoc = S->getLocStart();
1985   const char *startBuf = SM->getCharacterData(startLoc);
1986 
1987   assert((*startBuf == '@') && "bogus @try location");
1988   if (finalStmt)
1989     ReplaceText(startLoc, 1, buf);
1990   else
1991     // @try -> try
1992     ReplaceText(startLoc, 1, "");
1993 
1994   for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
1995     ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
1996     VarDecl *catchDecl = Catch->getCatchParamDecl();
1997 
1998     startLoc = Catch->getLocStart();
1999     bool AtRemoved = false;
2000     if (catchDecl) {
2001       QualType t = catchDecl->getType();
2002       if (const ObjCObjectPointerType *Ptr = t->getAs<ObjCObjectPointerType>()) {
2003         // Should be a pointer to a class.
2004         ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
2005         if (IDecl) {
2006           std::string Result;
2007           ConvertSourceLocationToLineDirective(Catch->getLocStart(), Result);
2008 
2009           startBuf = SM->getCharacterData(startLoc);
2010           assert((*startBuf == '@') && "bogus @catch location");
2011           SourceLocation rParenLoc = Catch->getRParenLoc();
2012           const char *rParenBuf = SM->getCharacterData(rParenLoc);
2013 
2014           // _objc_exc_Foo *_e as argument to catch.
2015           Result += "catch (_objc_exc_"; Result += IDecl->getNameAsString();
2016           Result += " *_"; Result += catchDecl->getNameAsString();
2017           Result += ")";
2018           ReplaceText(startLoc, rParenBuf-startBuf+1, Result);
2019           // Foo *e = (Foo *)_e;
2020           Result.clear();
2021           Result = "{ ";
2022           Result += IDecl->getNameAsString();
2023           Result += " *"; Result += catchDecl->getNameAsString();
2024           Result += " = ("; Result += IDecl->getNameAsString(); Result += "*)";
2025           Result += "_"; Result += catchDecl->getNameAsString();
2026 
2027           Result += "; ";
2028           SourceLocation lBraceLoc = Catch->getCatchBody()->getLocStart();
2029           ReplaceText(lBraceLoc, 1, Result);
2030           AtRemoved = true;
2031         }
2032       }
2033     }
2034     if (!AtRemoved)
2035       // @catch -> catch
2036       ReplaceText(startLoc, 1, "");
2037 
2038   }
2039   if (finalStmt) {
2040     buf.clear();
2041     SourceLocation FinallyLoc = finalStmt->getLocStart();
2042 
2043     if (noCatch) {
2044       ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2045       buf += "catch (id e) {_rethrow = e;}\n";
2046     }
2047     else {
2048       buf += "}\n";
2049       ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2050       buf += "catch (id e) {_rethrow = e;}\n";
2051     }
2052 
2053     SourceLocation startFinalLoc = finalStmt->getLocStart();
2054     ReplaceText(startFinalLoc, 8, buf);
2055     Stmt *body = finalStmt->getFinallyBody();
2056     SourceLocation startFinalBodyLoc = body->getLocStart();
2057     buf.clear();
2058     Write_RethrowObject(buf);
2059     ReplaceText(startFinalBodyLoc, 1, buf);
2060 
2061     SourceLocation endFinalBodyLoc = body->getLocEnd();
2062     ReplaceText(endFinalBodyLoc, 1, "}\n}");
2063     // Now check for any return/continue/go statements within the @try.
2064     WarnAboutReturnGotoStmts(S->getTryBody());
2065   }
2066 
2067   return nullptr;
2068 }
2069 
2070 // This can't be done with ReplaceStmt(S, ThrowExpr), since
2071 // the throw expression is typically a message expression that's already
2072 // been rewritten! (which implies the SourceLocation's are invalid).
2073 Stmt *RewriteModernObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
2074   // Get the start location and compute the semi location.
2075   SourceLocation startLoc = S->getLocStart();
2076   const char *startBuf = SM->getCharacterData(startLoc);
2077 
2078   assert((*startBuf == '@') && "bogus @throw location");
2079 
2080   std::string buf;
2081   /* void objc_exception_throw(id) __attribute__((noreturn)); */
2082   if (S->getThrowExpr())
2083     buf = "objc_exception_throw(";
2084   else
2085     buf = "throw";
2086 
2087   // handle "@  throw" correctly.
2088   const char *wBuf = strchr(startBuf, 'w');
2089   assert((*wBuf == 'w') && "@throw: can't find 'w'");
2090   ReplaceText(startLoc, wBuf-startBuf+1, buf);
2091 
2092   SourceLocation endLoc = S->getLocEnd();
2093   const char *endBuf = SM->getCharacterData(endLoc);
2094   const char *semiBuf = strchr(endBuf, ';');
2095   assert((*semiBuf == ';') && "@throw: can't find ';'");
2096   SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
2097   if (S->getThrowExpr())
2098     ReplaceText(semiLoc, 1, ");");
2099   return nullptr;
2100 }
2101 
2102 Stmt *RewriteModernObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
2103   // Create a new string expression.
2104   std::string StrEncoding;
2105   Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
2106   Expr *Replacement = getStringLiteral(StrEncoding);
2107   ReplaceStmt(Exp, Replacement);
2108 
2109   // Replace this subexpr in the parent.
2110   // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2111   return Replacement;
2112 }
2113 
2114 Stmt *RewriteModernObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
2115   if (!SelGetUidFunctionDecl)
2116     SynthSelGetUidFunctionDecl();
2117   assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
2118   // Create a call to sel_registerName("selName").
2119   SmallVector<Expr*, 8> SelExprs;
2120   SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
2121   CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2122                                                  &SelExprs[0], SelExprs.size());
2123   ReplaceStmt(Exp, SelExp);
2124   // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2125   return SelExp;
2126 }
2127 
2128 CallExpr *RewriteModernObjC::SynthesizeCallToFunctionDecl(
2129   FunctionDecl *FD, Expr **args, unsigned nargs, SourceLocation StartLoc,
2130                                                     SourceLocation EndLoc) {
2131   // Get the type, we will need to reference it in a couple spots.
2132   QualType msgSendType = FD->getType();
2133 
2134   // Create a reference to the objc_msgSend() declaration.
2135   DeclRefExpr *DRE =
2136     new (Context) DeclRefExpr(FD, false, msgSendType, VK_LValue, SourceLocation());
2137 
2138   // Now, we cast the reference to a pointer to the objc_msgSend type.
2139   QualType pToFunc = Context->getPointerType(msgSendType);
2140   ImplicitCastExpr *ICE =
2141     ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
2142                              DRE, nullptr, VK_RValue);
2143 
2144   const FunctionType *FT = msgSendType->getAs<FunctionType>();
2145 
2146   CallExpr *Exp =
2147     new (Context) CallExpr(*Context, ICE, llvm::makeArrayRef(args, nargs),
2148                            FT->getCallResultType(*Context),
2149                            VK_RValue, EndLoc);
2150   return Exp;
2151 }
2152 
2153 static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
2154                                 const char *&startRef, const char *&endRef) {
2155   while (startBuf < endBuf) {
2156     if (*startBuf == '<')
2157       startRef = startBuf; // mark the start.
2158     if (*startBuf == '>') {
2159       if (startRef && *startRef == '<') {
2160         endRef = startBuf; // mark the end.
2161         return true;
2162       }
2163       return false;
2164     }
2165     startBuf++;
2166   }
2167   return false;
2168 }
2169 
2170 static void scanToNextArgument(const char *&argRef) {
2171   int angle = 0;
2172   while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
2173     if (*argRef == '<')
2174       angle++;
2175     else if (*argRef == '>')
2176       angle--;
2177     argRef++;
2178   }
2179   assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
2180 }
2181 
2182 bool RewriteModernObjC::needToScanForQualifiers(QualType T) {
2183   if (T->isObjCQualifiedIdType())
2184     return true;
2185   if (const PointerType *PT = T->getAs<PointerType>()) {
2186     if (PT->getPointeeType()->isObjCQualifiedIdType())
2187       return true;
2188   }
2189   if (T->isObjCObjectPointerType()) {
2190     T = T->getPointeeType();
2191     return T->isObjCQualifiedInterfaceType();
2192   }
2193   if (T->isArrayType()) {
2194     QualType ElemTy = Context->getBaseElementType(T);
2195     return needToScanForQualifiers(ElemTy);
2196   }
2197   return false;
2198 }
2199 
2200 void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
2201   QualType Type = E->getType();
2202   if (needToScanForQualifiers(Type)) {
2203     SourceLocation Loc, EndLoc;
2204 
2205     if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
2206       Loc = ECE->getLParenLoc();
2207       EndLoc = ECE->getRParenLoc();
2208     } else {
2209       Loc = E->getLocStart();
2210       EndLoc = E->getLocEnd();
2211     }
2212     // This will defend against trying to rewrite synthesized expressions.
2213     if (Loc.isInvalid() || EndLoc.isInvalid())
2214       return;
2215 
2216     const char *startBuf = SM->getCharacterData(Loc);
2217     const char *endBuf = SM->getCharacterData(EndLoc);
2218     const char *startRef = nullptr, *endRef = nullptr;
2219     if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2220       // Get the locations of the startRef, endRef.
2221       SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
2222       SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
2223       // Comment out the protocol references.
2224       InsertText(LessLoc, "/*");
2225       InsertText(GreaterLoc, "*/");
2226     }
2227   }
2228 }
2229 
2230 void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
2231   SourceLocation Loc;
2232   QualType Type;
2233   const FunctionProtoType *proto = nullptr;
2234   if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
2235     Loc = VD->getLocation();
2236     Type = VD->getType();
2237   }
2238   else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
2239     Loc = FD->getLocation();
2240     // Check for ObjC 'id' and class types that have been adorned with protocol
2241     // information (id<p>, C<p>*). The protocol references need to be rewritten!
2242     const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2243     assert(funcType && "missing function type");
2244     proto = dyn_cast<FunctionProtoType>(funcType);
2245     if (!proto)
2246       return;
2247     Type = proto->getReturnType();
2248   }
2249   else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
2250     Loc = FD->getLocation();
2251     Type = FD->getType();
2252   }
2253   else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Dcl)) {
2254     Loc = TD->getLocation();
2255     Type = TD->getUnderlyingType();
2256   }
2257   else
2258     return;
2259 
2260   if (needToScanForQualifiers(Type)) {
2261     // Since types are unique, we need to scan the buffer.
2262 
2263     const char *endBuf = SM->getCharacterData(Loc);
2264     const char *startBuf = endBuf;
2265     while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
2266       startBuf--; // scan backward (from the decl location) for return type.
2267     const char *startRef = nullptr, *endRef = nullptr;
2268     if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2269       // Get the locations of the startRef, endRef.
2270       SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
2271       SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
2272       // Comment out the protocol references.
2273       InsertText(LessLoc, "/*");
2274       InsertText(GreaterLoc, "*/");
2275     }
2276   }
2277   if (!proto)
2278       return; // most likely, was a variable
2279   // Now check arguments.
2280   const char *startBuf = SM->getCharacterData(Loc);
2281   const char *startFuncBuf = startBuf;
2282   for (unsigned i = 0; i < proto->getNumParams(); i++) {
2283     if (needToScanForQualifiers(proto->getParamType(i))) {
2284       // Since types are unique, we need to scan the buffer.
2285 
2286       const char *endBuf = startBuf;
2287       // scan forward (from the decl location) for argument types.
2288       scanToNextArgument(endBuf);
2289       const char *startRef = nullptr, *endRef = nullptr;
2290       if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2291         // Get the locations of the startRef, endRef.
2292         SourceLocation LessLoc =
2293           Loc.getLocWithOffset(startRef-startFuncBuf);
2294         SourceLocation GreaterLoc =
2295           Loc.getLocWithOffset(endRef-startFuncBuf+1);
2296         // Comment out the protocol references.
2297         InsertText(LessLoc, "/*");
2298         InsertText(GreaterLoc, "*/");
2299       }
2300       startBuf = ++endBuf;
2301     }
2302     else {
2303       // If the function name is derived from a macro expansion, then the
2304       // argument buffer will not follow the name. Need to speak with Chris.
2305       while (*startBuf && *startBuf != ')' && *startBuf != ',')
2306         startBuf++; // scan forward (from the decl location) for argument types.
2307       startBuf++;
2308     }
2309   }
2310 }
2311 
2312 void RewriteModernObjC::RewriteTypeOfDecl(VarDecl *ND) {
2313   QualType QT = ND->getType();
2314   const Type* TypePtr = QT->getAs<Type>();
2315   if (!isa<TypeOfExprType>(TypePtr))
2316     return;
2317   while (isa<TypeOfExprType>(TypePtr)) {
2318     const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
2319     QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
2320     TypePtr = QT->getAs<Type>();
2321   }
2322   // FIXME. This will not work for multiple declarators; as in:
2323   // __typeof__(a) b,c,d;
2324   std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
2325   SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
2326   const char *startBuf = SM->getCharacterData(DeclLoc);
2327   if (ND->getInit()) {
2328     std::string Name(ND->getNameAsString());
2329     TypeAsString += " " + Name + " = ";
2330     Expr *E = ND->getInit();
2331     SourceLocation startLoc;
2332     if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
2333       startLoc = ECE->getLParenLoc();
2334     else
2335       startLoc = E->getLocStart();
2336     startLoc = SM->getExpansionLoc(startLoc);
2337     const char *endBuf = SM->getCharacterData(startLoc);
2338     ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2339   }
2340   else {
2341     SourceLocation X = ND->getLocEnd();
2342     X = SM->getExpansionLoc(X);
2343     const char *endBuf = SM->getCharacterData(X);
2344     ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2345   }
2346 }
2347 
2348 // SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
2349 void RewriteModernObjC::SynthSelGetUidFunctionDecl() {
2350   IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
2351   SmallVector<QualType, 16> ArgTys;
2352   ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2353   QualType getFuncType =
2354     getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
2355   SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2356                                                SourceLocation(),
2357                                                SourceLocation(),
2358                                                SelGetUidIdent, getFuncType,
2359                                                nullptr, SC_Extern);
2360 }
2361 
2362 void RewriteModernObjC::RewriteFunctionDecl(FunctionDecl *FD) {
2363   // declared in <objc/objc.h>
2364   if (FD->getIdentifier() &&
2365       FD->getName() == "sel_registerName") {
2366     SelGetUidFunctionDecl = FD;
2367     return;
2368   }
2369   RewriteObjCQualifiedInterfaceTypes(FD);
2370 }
2371 
2372 void RewriteModernObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
2373   std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2374   const char *argPtr = TypeString.c_str();
2375   if (!strchr(argPtr, '^')) {
2376     Str += TypeString;
2377     return;
2378   }
2379   while (*argPtr) {
2380     Str += (*argPtr == '^' ? '*' : *argPtr);
2381     argPtr++;
2382   }
2383 }
2384 
2385 // FIXME. Consolidate this routine with RewriteBlockPointerType.
2386 void RewriteModernObjC::RewriteBlockPointerTypeVariable(std::string& Str,
2387                                                   ValueDecl *VD) {
2388   QualType Type = VD->getType();
2389   std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2390   const char *argPtr = TypeString.c_str();
2391   int paren = 0;
2392   while (*argPtr) {
2393     switch (*argPtr) {
2394       case '(':
2395         Str += *argPtr;
2396         paren++;
2397         break;
2398       case ')':
2399         Str += *argPtr;
2400         paren--;
2401         break;
2402       case '^':
2403         Str += '*';
2404         if (paren == 1)
2405           Str += VD->getNameAsString();
2406         break;
2407       default:
2408         Str += *argPtr;
2409         break;
2410     }
2411     argPtr++;
2412   }
2413 }
2414 
2415 void RewriteModernObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
2416   SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
2417   const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2418   const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
2419   if (!proto)
2420     return;
2421   QualType Type = proto->getReturnType();
2422   std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
2423   FdStr += " ";
2424   FdStr += FD->getName();
2425   FdStr +=  "(";
2426   unsigned numArgs = proto->getNumParams();
2427   for (unsigned i = 0; i < numArgs; i++) {
2428     QualType ArgType = proto->getParamType(i);
2429   RewriteBlockPointerType(FdStr, ArgType);
2430   if (i+1 < numArgs)
2431     FdStr += ", ";
2432   }
2433   if (FD->isVariadic()) {
2434     FdStr +=  (numArgs > 0) ? ", ...);\n" : "...);\n";
2435   }
2436   else
2437     FdStr +=  ");\n";
2438   InsertText(FunLocStart, FdStr);
2439 }
2440 
2441 // SynthSuperConstructorFunctionDecl - id __rw_objc_super(id obj, id super);
2442 void RewriteModernObjC::SynthSuperConstructorFunctionDecl() {
2443   if (SuperConstructorFunctionDecl)
2444     return;
2445   IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
2446   SmallVector<QualType, 16> ArgTys;
2447   QualType argT = Context->getObjCIdType();
2448   assert(!argT.isNull() && "Can't find 'id' type");
2449   ArgTys.push_back(argT);
2450   ArgTys.push_back(argT);
2451   QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2452                                                ArgTys);
2453   SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2454                                                      SourceLocation(),
2455                                                      SourceLocation(),
2456                                                      msgSendIdent, msgSendType,
2457                                                      nullptr, SC_Extern);
2458 }
2459 
2460 // SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
2461 void RewriteModernObjC::SynthMsgSendFunctionDecl() {
2462   IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
2463   SmallVector<QualType, 16> ArgTys;
2464   QualType argT = Context->getObjCIdType();
2465   assert(!argT.isNull() && "Can't find 'id' type");
2466   ArgTys.push_back(argT);
2467   argT = Context->getObjCSelType();
2468   assert(!argT.isNull() && "Can't find 'SEL' type");
2469   ArgTys.push_back(argT);
2470   QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2471                                                ArgTys, /*isVariadic=*/true);
2472   MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2473                                              SourceLocation(),
2474                                              SourceLocation(),
2475                                              msgSendIdent, msgSendType, nullptr,
2476                                              SC_Extern);
2477 }
2478 
2479 // SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(void);
2480 void RewriteModernObjC::SynthMsgSendSuperFunctionDecl() {
2481   IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
2482   SmallVector<QualType, 2> ArgTys;
2483   ArgTys.push_back(Context->VoidTy);
2484   QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2485                                                ArgTys, /*isVariadic=*/true);
2486   MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2487                                                   SourceLocation(),
2488                                                   SourceLocation(),
2489                                                   msgSendIdent, msgSendType,
2490                                                   nullptr, SC_Extern);
2491 }
2492 
2493 // SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
2494 void RewriteModernObjC::SynthMsgSendStretFunctionDecl() {
2495   IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
2496   SmallVector<QualType, 16> ArgTys;
2497   QualType argT = Context->getObjCIdType();
2498   assert(!argT.isNull() && "Can't find 'id' type");
2499   ArgTys.push_back(argT);
2500   argT = Context->getObjCSelType();
2501   assert(!argT.isNull() && "Can't find 'SEL' type");
2502   ArgTys.push_back(argT);
2503   QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2504                                                ArgTys, /*isVariadic=*/true);
2505   MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2506                                                   SourceLocation(),
2507                                                   SourceLocation(),
2508                                                   msgSendIdent, msgSendType,
2509                                                   nullptr, SC_Extern);
2510 }
2511 
2512 // SynthMsgSendSuperStretFunctionDecl -
2513 // id objc_msgSendSuper_stret(void);
2514 void RewriteModernObjC::SynthMsgSendSuperStretFunctionDecl() {
2515   IdentifierInfo *msgSendIdent =
2516     &Context->Idents.get("objc_msgSendSuper_stret");
2517   SmallVector<QualType, 2> ArgTys;
2518   ArgTys.push_back(Context->VoidTy);
2519   QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2520                                                ArgTys, /*isVariadic=*/true);
2521   MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2522                                                        SourceLocation(),
2523                                                        SourceLocation(),
2524                                                        msgSendIdent,
2525                                                        msgSendType, nullptr,
2526                                                        SC_Extern);
2527 }
2528 
2529 // SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
2530 void RewriteModernObjC::SynthMsgSendFpretFunctionDecl() {
2531   IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
2532   SmallVector<QualType, 16> ArgTys;
2533   QualType argT = Context->getObjCIdType();
2534   assert(!argT.isNull() && "Can't find 'id' type");
2535   ArgTys.push_back(argT);
2536   argT = Context->getObjCSelType();
2537   assert(!argT.isNull() && "Can't find 'SEL' type");
2538   ArgTys.push_back(argT);
2539   QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
2540                                                ArgTys, /*isVariadic=*/true);
2541   MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2542                                                   SourceLocation(),
2543                                                   SourceLocation(),
2544                                                   msgSendIdent, msgSendType,
2545                                                   nullptr, SC_Extern);
2546 }
2547 
2548 // SynthGetClassFunctionDecl - Class objc_getClass(const char *name);
2549 void RewriteModernObjC::SynthGetClassFunctionDecl() {
2550   IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
2551   SmallVector<QualType, 16> ArgTys;
2552   ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2553   QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2554                                                 ArgTys);
2555   GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2556                                               SourceLocation(),
2557                                               SourceLocation(),
2558                                               getClassIdent, getClassType,
2559                                               nullptr, SC_Extern);
2560 }
2561 
2562 // SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
2563 void RewriteModernObjC::SynthGetSuperClassFunctionDecl() {
2564   IdentifierInfo *getSuperClassIdent =
2565     &Context->Idents.get("class_getSuperclass");
2566   SmallVector<QualType, 16> ArgTys;
2567   ArgTys.push_back(Context->getObjCClassType());
2568   QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2569                                                 ArgTys);
2570   GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2571                                                    SourceLocation(),
2572                                                    SourceLocation(),
2573                                                    getSuperClassIdent,
2574                                                    getClassType, nullptr,
2575                                                    SC_Extern);
2576 }
2577 
2578 // SynthGetMetaClassFunctionDecl - Class objc_getMetaClass(const char *name);
2579 void RewriteModernObjC::SynthGetMetaClassFunctionDecl() {
2580   IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
2581   SmallVector<QualType, 16> ArgTys;
2582   ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2583   QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2584                                                 ArgTys);
2585   GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2586                                                   SourceLocation(),
2587                                                   SourceLocation(),
2588                                                   getClassIdent, getClassType,
2589                                                   nullptr, SC_Extern);
2590 }
2591 
2592 Stmt *RewriteModernObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
2593   assert (Exp != nullptr && "Expected non-null ObjCStringLiteral");
2594   QualType strType = getConstantStringStructType();
2595 
2596   std::string S = "__NSConstantStringImpl_";
2597 
2598   std::string tmpName = InFileName;
2599   unsigned i;
2600   for (i=0; i < tmpName.length(); i++) {
2601     char c = tmpName.at(i);
2602     // replace any non-alphanumeric characters with '_'.
2603     if (!isAlphanumeric(c))
2604       tmpName[i] = '_';
2605   }
2606   S += tmpName;
2607   S += "_";
2608   S += utostr(NumObjCStringLiterals++);
2609 
2610   Preamble += "static __NSConstantStringImpl " + S;
2611   Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
2612   Preamble += "0x000007c8,"; // utf8_str
2613   // The pretty printer for StringLiteral handles escape characters properly.
2614   std::string prettyBufS;
2615   llvm::raw_string_ostream prettyBuf(prettyBufS);
2616   Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
2617   Preamble += prettyBuf.str();
2618   Preamble += ",";
2619   Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
2620 
2621   VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
2622                                    SourceLocation(), &Context->Idents.get(S),
2623                                    strType, nullptr, SC_Static);
2624   DeclRefExpr *DRE = new (Context) DeclRefExpr(NewVD, false, strType, VK_LValue,
2625                                                SourceLocation());
2626   Expr *Unop = new (Context) UnaryOperator(DRE, UO_AddrOf,
2627                                  Context->getPointerType(DRE->getType()),
2628                                            VK_RValue, OK_Ordinary,
2629                                            SourceLocation());
2630   // cast to NSConstantString *
2631   CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
2632                                             CK_CPointerToObjCPointerCast, Unop);
2633   ReplaceStmt(Exp, cast);
2634   // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2635   return cast;
2636 }
2637 
2638 Stmt *RewriteModernObjC::RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp) {
2639   unsigned IntSize =
2640     static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
2641 
2642   Expr *FlagExp = IntegerLiteral::Create(*Context,
2643                                          llvm::APInt(IntSize, Exp->getValue()),
2644                                          Context->IntTy, Exp->getLocation());
2645   CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Context->ObjCBuiltinBoolTy,
2646                                             CK_BitCast, FlagExp);
2647   ParenExpr *PE = new (Context) ParenExpr(Exp->getLocation(), Exp->getExprLoc(),
2648                                           cast);
2649   ReplaceStmt(Exp, PE);
2650   return PE;
2651 }
2652 
2653 Stmt *RewriteModernObjC::RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp) {
2654   // synthesize declaration of helper functions needed in this routine.
2655   if (!SelGetUidFunctionDecl)
2656     SynthSelGetUidFunctionDecl();
2657   // use objc_msgSend() for all.
2658   if (!MsgSendFunctionDecl)
2659     SynthMsgSendFunctionDecl();
2660   if (!GetClassFunctionDecl)
2661     SynthGetClassFunctionDecl();
2662 
2663   FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2664   SourceLocation StartLoc = Exp->getLocStart();
2665   SourceLocation EndLoc = Exp->getLocEnd();
2666 
2667   // Synthesize a call to objc_msgSend().
2668   SmallVector<Expr*, 4> MsgExprs;
2669   SmallVector<Expr*, 4> ClsExprs;
2670 
2671   // Create a call to objc_getClass("<BoxingClass>"). It will be the 1st argument.
2672   ObjCMethodDecl *BoxingMethod = Exp->getBoxingMethod();
2673   ObjCInterfaceDecl *BoxingClass = BoxingMethod->getClassInterface();
2674 
2675   IdentifierInfo *clsName = BoxingClass->getIdentifier();
2676   ClsExprs.push_back(getStringLiteral(clsName->getName()));
2677   CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
2678                                                &ClsExprs[0],
2679                                                ClsExprs.size(),
2680                                                StartLoc, EndLoc);
2681   MsgExprs.push_back(Cls);
2682 
2683   // Create a call to sel_registerName("<BoxingMethod>:"), etc.
2684   // it will be the 2nd argument.
2685   SmallVector<Expr*, 4> SelExprs;
2686   SelExprs.push_back(
2687       getStringLiteral(BoxingMethod->getSelector().getAsString()));
2688   CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2689                                                   &SelExprs[0], SelExprs.size(),
2690                                                   StartLoc, EndLoc);
2691   MsgExprs.push_back(SelExp);
2692 
2693   // User provided sub-expression is the 3rd, and last, argument.
2694   Expr *subExpr  = Exp->getSubExpr();
2695   if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(subExpr)) {
2696     QualType type = ICE->getType();
2697     const Expr *SubExpr = ICE->IgnoreParenImpCasts();
2698     CastKind CK = CK_BitCast;
2699     if (SubExpr->getType()->isIntegralType(*Context) && type->isBooleanType())
2700       CK = CK_IntegralToBoolean;
2701     subExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, subExpr);
2702   }
2703   MsgExprs.push_back(subExpr);
2704 
2705   SmallVector<QualType, 4> ArgTypes;
2706   ArgTypes.push_back(Context->getObjCIdType());
2707   ArgTypes.push_back(Context->getObjCSelType());
2708   for (const auto PI : BoxingMethod->parameters())
2709     ArgTypes.push_back(PI->getType());
2710 
2711   QualType returnType = Exp->getType();
2712   // Get the type, we will need to reference it in a couple spots.
2713   QualType msgSendType = MsgSendFlavor->getType();
2714 
2715   // Create a reference to the objc_msgSend() declaration.
2716   DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, false, msgSendType,
2717                                                VK_LValue, SourceLocation());
2718 
2719   CastExpr *cast = NoTypeInfoCStyleCastExpr(Context,
2720                                             Context->getPointerType(Context->VoidTy),
2721                                             CK_BitCast, DRE);
2722 
2723   // Now do the "normal" pointer to function cast.
2724   QualType castType =
2725     getSimpleFunctionType(returnType, ArgTypes, BoxingMethod->isVariadic());
2726   castType = Context->getPointerType(castType);
2727   cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2728                                   cast);
2729 
2730   // Don't forget the parens to enforce the proper binding.
2731   ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2732 
2733   const FunctionType *FT = msgSendType->getAs<FunctionType>();
2734   CallExpr *CE = new (Context)
2735       CallExpr(*Context, PE, MsgExprs, FT->getReturnType(), VK_RValue, EndLoc);
2736   ReplaceStmt(Exp, CE);
2737   return CE;
2738 }
2739 
2740 Stmt *RewriteModernObjC::RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp) {
2741   // synthesize declaration of helper functions needed in this routine.
2742   if (!SelGetUidFunctionDecl)
2743     SynthSelGetUidFunctionDecl();
2744   // use objc_msgSend() for all.
2745   if (!MsgSendFunctionDecl)
2746     SynthMsgSendFunctionDecl();
2747   if (!GetClassFunctionDecl)
2748     SynthGetClassFunctionDecl();
2749 
2750   FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2751   SourceLocation StartLoc = Exp->getLocStart();
2752   SourceLocation EndLoc = Exp->getLocEnd();
2753 
2754   // Build the expression: __NSContainer_literal(int, ...).arr
2755   QualType IntQT = Context->IntTy;
2756   QualType NSArrayFType =
2757     getSimpleFunctionType(Context->VoidTy, IntQT, true);
2758   std::string NSArrayFName("__NSContainer_literal");
2759   FunctionDecl *NSArrayFD = SynthBlockInitFunctionDecl(NSArrayFName);
2760   DeclRefExpr *NSArrayDRE =
2761     new (Context) DeclRefExpr(NSArrayFD, false, NSArrayFType, VK_RValue,
2762                               SourceLocation());
2763 
2764   SmallVector<Expr*, 16> InitExprs;
2765   unsigned NumElements = Exp->getNumElements();
2766   unsigned UnsignedIntSize =
2767     static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2768   Expr *count = IntegerLiteral::Create(*Context,
2769                                        llvm::APInt(UnsignedIntSize, NumElements),
2770                                        Context->UnsignedIntTy, SourceLocation());
2771   InitExprs.push_back(count);
2772   for (unsigned i = 0; i < NumElements; i++)
2773     InitExprs.push_back(Exp->getElement(i));
2774   Expr *NSArrayCallExpr =
2775     new (Context) CallExpr(*Context, NSArrayDRE, InitExprs,
2776                            NSArrayFType, VK_LValue, SourceLocation());
2777 
2778   FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
2779                                     SourceLocation(),
2780                                     &Context->Idents.get("arr"),
2781                                     Context->getPointerType(Context->VoidPtrTy),
2782                                     nullptr, /*BitWidth=*/nullptr,
2783                                     /*Mutable=*/true, ICIS_NoInit);
2784   MemberExpr *ArrayLiteralME =
2785     new (Context) MemberExpr(NSArrayCallExpr, false, ARRFD,
2786                              SourceLocation(),
2787                              ARRFD->getType(), VK_LValue,
2788                              OK_Ordinary);
2789   QualType ConstIdT = Context->getObjCIdType().withConst();
2790   CStyleCastExpr * ArrayLiteralObjects =
2791     NoTypeInfoCStyleCastExpr(Context,
2792                              Context->getPointerType(ConstIdT),
2793                              CK_BitCast,
2794                              ArrayLiteralME);
2795 
2796   // Synthesize a call to objc_msgSend().
2797   SmallVector<Expr*, 32> MsgExprs;
2798   SmallVector<Expr*, 4> ClsExprs;
2799   QualType expType = Exp->getType();
2800 
2801   // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2802   ObjCInterfaceDecl *Class =
2803     expType->getPointeeType()->getAs<ObjCObjectType>()->getInterface();
2804 
2805   IdentifierInfo *clsName = Class->getIdentifier();
2806   ClsExprs.push_back(getStringLiteral(clsName->getName()));
2807   CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
2808                                                &ClsExprs[0],
2809                                                ClsExprs.size(),
2810                                                StartLoc, EndLoc);
2811   MsgExprs.push_back(Cls);
2812 
2813   // Create a call to sel_registerName("arrayWithObjects:count:").
2814   // it will be the 2nd argument.
2815   SmallVector<Expr*, 4> SelExprs;
2816   ObjCMethodDecl *ArrayMethod = Exp->getArrayWithObjectsMethod();
2817   SelExprs.push_back(
2818       getStringLiteral(ArrayMethod->getSelector().getAsString()));
2819   CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2820                                                   &SelExprs[0], SelExprs.size(),
2821                                                   StartLoc, EndLoc);
2822   MsgExprs.push_back(SelExp);
2823 
2824   // (const id [])objects
2825   MsgExprs.push_back(ArrayLiteralObjects);
2826 
2827   // (NSUInteger)cnt
2828   Expr *cnt = IntegerLiteral::Create(*Context,
2829                                      llvm::APInt(UnsignedIntSize, NumElements),
2830                                      Context->UnsignedIntTy, SourceLocation());
2831   MsgExprs.push_back(cnt);
2832 
2833 
2834   SmallVector<QualType, 4> ArgTypes;
2835   ArgTypes.push_back(Context->getObjCIdType());
2836   ArgTypes.push_back(Context->getObjCSelType());
2837   for (const auto *PI : ArrayMethod->params())
2838     ArgTypes.push_back(PI->getType());
2839 
2840   QualType returnType = Exp->getType();
2841   // Get the type, we will need to reference it in a couple spots.
2842   QualType msgSendType = MsgSendFlavor->getType();
2843 
2844   // Create a reference to the objc_msgSend() declaration.
2845   DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, false, msgSendType,
2846                                                VK_LValue, SourceLocation());
2847 
2848   CastExpr *cast = NoTypeInfoCStyleCastExpr(Context,
2849                                             Context->getPointerType(Context->VoidTy),
2850                                             CK_BitCast, DRE);
2851 
2852   // Now do the "normal" pointer to function cast.
2853   QualType castType =
2854   getSimpleFunctionType(returnType, ArgTypes, ArrayMethod->isVariadic());
2855   castType = Context->getPointerType(castType);
2856   cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2857                                   cast);
2858 
2859   // Don't forget the parens to enforce the proper binding.
2860   ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2861 
2862   const FunctionType *FT = msgSendType->getAs<FunctionType>();
2863   CallExpr *CE = new (Context)
2864       CallExpr(*Context, PE, MsgExprs, FT->getReturnType(), VK_RValue, EndLoc);
2865   ReplaceStmt(Exp, CE);
2866   return CE;
2867 }
2868 
2869 Stmt *RewriteModernObjC::RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp) {
2870   // synthesize declaration of helper functions needed in this routine.
2871   if (!SelGetUidFunctionDecl)
2872     SynthSelGetUidFunctionDecl();
2873   // use objc_msgSend() for all.
2874   if (!MsgSendFunctionDecl)
2875     SynthMsgSendFunctionDecl();
2876   if (!GetClassFunctionDecl)
2877     SynthGetClassFunctionDecl();
2878 
2879   FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2880   SourceLocation StartLoc = Exp->getLocStart();
2881   SourceLocation EndLoc = Exp->getLocEnd();
2882 
2883   // Build the expression: __NSContainer_literal(int, ...).arr
2884   QualType IntQT = Context->IntTy;
2885   QualType NSDictFType =
2886     getSimpleFunctionType(Context->VoidTy, IntQT, true);
2887   std::string NSDictFName("__NSContainer_literal");
2888   FunctionDecl *NSDictFD = SynthBlockInitFunctionDecl(NSDictFName);
2889   DeclRefExpr *NSDictDRE =
2890     new (Context) DeclRefExpr(NSDictFD, false, NSDictFType, VK_RValue,
2891                               SourceLocation());
2892 
2893   SmallVector<Expr*, 16> KeyExprs;
2894   SmallVector<Expr*, 16> ValueExprs;
2895 
2896   unsigned NumElements = Exp->getNumElements();
2897   unsigned UnsignedIntSize =
2898     static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2899   Expr *count = IntegerLiteral::Create(*Context,
2900                                        llvm::APInt(UnsignedIntSize, NumElements),
2901                                        Context->UnsignedIntTy, SourceLocation());
2902   KeyExprs.push_back(count);
2903   ValueExprs.push_back(count);
2904   for (unsigned i = 0; i < NumElements; i++) {
2905     ObjCDictionaryElement Element = Exp->getKeyValueElement(i);
2906     KeyExprs.push_back(Element.Key);
2907     ValueExprs.push_back(Element.Value);
2908   }
2909 
2910   // (const id [])objects
2911   Expr *NSValueCallExpr =
2912     new (Context) CallExpr(*Context, NSDictDRE, ValueExprs,
2913                            NSDictFType, VK_LValue, SourceLocation());
2914 
2915   FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
2916                                        SourceLocation(),
2917                                        &Context->Idents.get("arr"),
2918                                        Context->getPointerType(Context->VoidPtrTy),
2919                                        nullptr, /*BitWidth=*/nullptr,
2920                                        /*Mutable=*/true, ICIS_NoInit);
2921   MemberExpr *DictLiteralValueME =
2922     new (Context) MemberExpr(NSValueCallExpr, false, ARRFD,
2923                              SourceLocation(),
2924                              ARRFD->getType(), VK_LValue,
2925                              OK_Ordinary);
2926   QualType ConstIdT = Context->getObjCIdType().withConst();
2927   CStyleCastExpr * DictValueObjects =
2928     NoTypeInfoCStyleCastExpr(Context,
2929                              Context->getPointerType(ConstIdT),
2930                              CK_BitCast,
2931                              DictLiteralValueME);
2932   // (const id <NSCopying> [])keys
2933   Expr *NSKeyCallExpr =
2934     new (Context) CallExpr(*Context, NSDictDRE, KeyExprs,
2935                            NSDictFType, VK_LValue, SourceLocation());
2936 
2937   MemberExpr *DictLiteralKeyME =
2938     new (Context) MemberExpr(NSKeyCallExpr, false, ARRFD,
2939                              SourceLocation(),
2940                              ARRFD->getType(), VK_LValue,
2941                              OK_Ordinary);
2942 
2943   CStyleCastExpr * DictKeyObjects =
2944     NoTypeInfoCStyleCastExpr(Context,
2945                              Context->getPointerType(ConstIdT),
2946                              CK_BitCast,
2947                              DictLiteralKeyME);
2948 
2949 
2950 
2951   // Synthesize a call to objc_msgSend().
2952   SmallVector<Expr*, 32> MsgExprs;
2953   SmallVector<Expr*, 4> ClsExprs;
2954   QualType expType = Exp->getType();
2955 
2956   // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2957   ObjCInterfaceDecl *Class =
2958   expType->getPointeeType()->getAs<ObjCObjectType>()->getInterface();
2959 
2960   IdentifierInfo *clsName = Class->getIdentifier();
2961   ClsExprs.push_back(getStringLiteral(clsName->getName()));
2962   CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
2963                                                &ClsExprs[0],
2964                                                ClsExprs.size(),
2965                                                StartLoc, EndLoc);
2966   MsgExprs.push_back(Cls);
2967 
2968   // Create a call to sel_registerName("arrayWithObjects:count:").
2969   // it will be the 2nd argument.
2970   SmallVector<Expr*, 4> SelExprs;
2971   ObjCMethodDecl *DictMethod = Exp->getDictWithObjectsMethod();
2972   SelExprs.push_back(getStringLiteral(DictMethod->getSelector().getAsString()));
2973   CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2974                                                   &SelExprs[0], SelExprs.size(),
2975                                                   StartLoc, EndLoc);
2976   MsgExprs.push_back(SelExp);
2977 
2978   // (const id [])objects
2979   MsgExprs.push_back(DictValueObjects);
2980 
2981   // (const id <NSCopying> [])keys
2982   MsgExprs.push_back(DictKeyObjects);
2983 
2984   // (NSUInteger)cnt
2985   Expr *cnt = IntegerLiteral::Create(*Context,
2986                                      llvm::APInt(UnsignedIntSize, NumElements),
2987                                      Context->UnsignedIntTy, SourceLocation());
2988   MsgExprs.push_back(cnt);
2989 
2990 
2991   SmallVector<QualType, 8> ArgTypes;
2992   ArgTypes.push_back(Context->getObjCIdType());
2993   ArgTypes.push_back(Context->getObjCSelType());
2994   for (const auto *PI : DictMethod->params()) {
2995     QualType T = PI->getType();
2996     if (const PointerType* PT = T->getAs<PointerType>()) {
2997       QualType PointeeTy = PT->getPointeeType();
2998       convertToUnqualifiedObjCType(PointeeTy);
2999       T = Context->getPointerType(PointeeTy);
3000     }
3001     ArgTypes.push_back(T);
3002   }
3003 
3004   QualType returnType = Exp->getType();
3005   // Get the type, we will need to reference it in a couple spots.
3006   QualType msgSendType = MsgSendFlavor->getType();
3007 
3008   // Create a reference to the objc_msgSend() declaration.
3009   DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, false, msgSendType,
3010                                                VK_LValue, SourceLocation());
3011 
3012   CastExpr *cast = NoTypeInfoCStyleCastExpr(Context,
3013                                             Context->getPointerType(Context->VoidTy),
3014                                             CK_BitCast, DRE);
3015 
3016   // Now do the "normal" pointer to function cast.
3017   QualType castType =
3018   getSimpleFunctionType(returnType, ArgTypes, DictMethod->isVariadic());
3019   castType = Context->getPointerType(castType);
3020   cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
3021                                   cast);
3022 
3023   // Don't forget the parens to enforce the proper binding.
3024   ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
3025 
3026   const FunctionType *FT = msgSendType->getAs<FunctionType>();
3027   CallExpr *CE = new (Context)
3028       CallExpr(*Context, PE, MsgExprs, FT->getReturnType(), VK_RValue, EndLoc);
3029   ReplaceStmt(Exp, CE);
3030   return CE;
3031 }
3032 
3033 // struct __rw_objc_super {
3034 //   struct objc_object *object; struct objc_object *superClass;
3035 // };
3036 QualType RewriteModernObjC::getSuperStructType() {
3037   if (!SuperStructDecl) {
3038     SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
3039                                          SourceLocation(), SourceLocation(),
3040                                          &Context->Idents.get("__rw_objc_super"));
3041     QualType FieldTypes[2];
3042 
3043     // struct objc_object *object;
3044     FieldTypes[0] = Context->getObjCIdType();
3045     // struct objc_object *superClass;
3046     FieldTypes[1] = Context->getObjCIdType();
3047 
3048     // Create fields
3049     for (unsigned i = 0; i < 2; ++i) {
3050       SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
3051                                                  SourceLocation(),
3052                                                  SourceLocation(), nullptr,
3053                                                  FieldTypes[i], nullptr,
3054                                                  /*BitWidth=*/nullptr,
3055                                                  /*Mutable=*/false,
3056                                                  ICIS_NoInit));
3057     }
3058 
3059     SuperStructDecl->completeDefinition();
3060   }
3061   return Context->getTagDeclType(SuperStructDecl);
3062 }
3063 
3064 QualType RewriteModernObjC::getConstantStringStructType() {
3065   if (!ConstantStringDecl) {
3066     ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
3067                                             SourceLocation(), SourceLocation(),
3068                          &Context->Idents.get("__NSConstantStringImpl"));
3069     QualType FieldTypes[4];
3070 
3071     // struct objc_object *receiver;
3072     FieldTypes[0] = Context->getObjCIdType();
3073     // int flags;
3074     FieldTypes[1] = Context->IntTy;
3075     // char *str;
3076     FieldTypes[2] = Context->getPointerType(Context->CharTy);
3077     // long length;
3078     FieldTypes[3] = Context->LongTy;
3079 
3080     // Create fields
3081     for (unsigned i = 0; i < 4; ++i) {
3082       ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
3083                                                     ConstantStringDecl,
3084                                                     SourceLocation(),
3085                                                     SourceLocation(), nullptr,
3086                                                     FieldTypes[i], nullptr,
3087                                                     /*BitWidth=*/nullptr,
3088                                                     /*Mutable=*/true,
3089                                                     ICIS_NoInit));
3090     }
3091 
3092     ConstantStringDecl->completeDefinition();
3093   }
3094   return Context->getTagDeclType(ConstantStringDecl);
3095 }
3096 
3097 /// getFunctionSourceLocation - returns start location of a function
3098 /// definition. Complication arises when function has declared as
3099 /// extern "C" or extern "C" {...}
3100 static SourceLocation getFunctionSourceLocation (RewriteModernObjC &R,
3101                                                  FunctionDecl *FD) {
3102   if (FD->isExternC()  && !FD->isMain()) {
3103     const DeclContext *DC = FD->getDeclContext();
3104     if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3105       // if it is extern "C" {...}, return function decl's own location.
3106       if (!LSD->getRBraceLoc().isValid())
3107         return LSD->getExternLoc();
3108   }
3109   if (FD->getStorageClass() != SC_None)
3110     R.RewriteBlockLiteralFunctionDecl(FD);
3111   return FD->getTypeSpecStartLoc();
3112 }
3113 
3114 void RewriteModernObjC::RewriteLineDirective(const Decl *D) {
3115 
3116   SourceLocation Location = D->getLocation();
3117 
3118   if (Location.isFileID() && GenerateLineInfo) {
3119     std::string LineString("\n#line ");
3120     PresumedLoc PLoc = SM->getPresumedLoc(Location);
3121     LineString += utostr(PLoc.getLine());
3122     LineString += " \"";
3123     LineString += Lexer::Stringify(PLoc.getFilename());
3124     if (isa<ObjCMethodDecl>(D))
3125       LineString += "\"";
3126     else LineString += "\"\n";
3127 
3128     Location = D->getLocStart();
3129     if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
3130       if (FD->isExternC()  && !FD->isMain()) {
3131         const DeclContext *DC = FD->getDeclContext();
3132         if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3133           // if it is extern "C" {...}, return function decl's own location.
3134           if (!LSD->getRBraceLoc().isValid())
3135             Location = LSD->getExternLoc();
3136       }
3137     }
3138     InsertText(Location, LineString);
3139   }
3140 }
3141 
3142 /// SynthMsgSendStretCallExpr - This routine translates message expression
3143 /// into a call to objc_msgSend_stret() entry point. Tricky part is that
3144 /// nil check on receiver must be performed before calling objc_msgSend_stret.
3145 /// MsgSendStretFlavor - function declaration objc_msgSend_stret(...)
3146 /// msgSendType - function type of objc_msgSend_stret(...)
3147 /// returnType - Result type of the method being synthesized.
3148 /// ArgTypes - type of the arguments passed to objc_msgSend_stret, starting with receiver type.
3149 /// MsgExprs - list of argument expressions being passed to objc_msgSend_stret,
3150 /// starting with receiver.
3151 /// Method - Method being rewritten.
3152 Expr *RewriteModernObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
3153                                                  QualType returnType,
3154                                                  SmallVectorImpl<QualType> &ArgTypes,
3155                                                  SmallVectorImpl<Expr*> &MsgExprs,
3156                                                  ObjCMethodDecl *Method) {
3157   // Now do the "normal" pointer to function cast.
3158   QualType castType = getSimpleFunctionType(returnType, ArgTypes,
3159                                             Method ? Method->isVariadic()
3160                                                    : false);
3161   castType = Context->getPointerType(castType);
3162 
3163   // build type for containing the objc_msgSend_stret object.
3164   static unsigned stretCount=0;
3165   std::string name = "__Stret"; name += utostr(stretCount);
3166   std::string str =
3167     "extern \"C\" void * __cdecl memset(void *_Dst, int _Val, size_t _Size);\n";
3168   str += "namespace {\n";
3169   str += "struct "; str += name;
3170   str += " {\n\t";
3171   str += name;
3172   str += "(id receiver, SEL sel";
3173   for (unsigned i = 2; i < ArgTypes.size(); i++) {
3174     std::string ArgName = "arg"; ArgName += utostr(i);
3175     ArgTypes[i].getAsStringInternal(ArgName, Context->getPrintingPolicy());
3176     str += ", "; str += ArgName;
3177   }
3178   // could be vararg.
3179   for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3180     std::string ArgName = "arg"; ArgName += utostr(i);
3181     MsgExprs[i]->getType().getAsStringInternal(ArgName,
3182                                                Context->getPrintingPolicy());
3183     str += ", "; str += ArgName;
3184   }
3185 
3186   str += ") {\n";
3187   str += "\t  unsigned size = sizeof(";
3188   str += returnType.getAsString(Context->getPrintingPolicy()); str += ");\n";
3189 
3190   str += "\t  if (size == 1 || size == 2 || size == 4 || size == 8)\n";
3191 
3192   str += "\t    s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3193   str += ")(void *)objc_msgSend)(receiver, sel";
3194   for (unsigned i = 2; i < ArgTypes.size(); i++) {
3195     str += ", arg"; str += utostr(i);
3196   }
3197   // could be vararg.
3198   for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3199     str += ", arg"; str += utostr(i);
3200   }
3201   str+= ");\n";
3202 
3203   str += "\t  else if (receiver == 0)\n";
3204   str += "\t    memset((void*)&s, 0, sizeof(s));\n";
3205   str += "\t  else\n";
3206 
3207 
3208   str += "\t    s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3209   str += ")(void *)objc_msgSend_stret)(receiver, sel";
3210   for (unsigned i = 2; i < ArgTypes.size(); i++) {
3211     str += ", arg"; str += utostr(i);
3212   }
3213   // could be vararg.
3214   for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3215     str += ", arg"; str += utostr(i);
3216   }
3217   str += ");\n";
3218 
3219 
3220   str += "\t}\n";
3221   str += "\t"; str += returnType.getAsString(Context->getPrintingPolicy());
3222   str += " s;\n";
3223   str += "};\n};\n\n";
3224   SourceLocation FunLocStart;
3225   if (CurFunctionDef)
3226     FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
3227   else {
3228     assert(CurMethodDef && "SynthMsgSendStretCallExpr - CurMethodDef is null");
3229     FunLocStart = CurMethodDef->getLocStart();
3230   }
3231 
3232   InsertText(FunLocStart, str);
3233   ++stretCount;
3234 
3235   // AST for __Stretn(receiver, args).s;
3236   IdentifierInfo *ID = &Context->Idents.get(name);
3237   FunctionDecl *FD = FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
3238                                           SourceLocation(), ID, castType,
3239                                           nullptr, SC_Extern, false, false);
3240   DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, false, castType, VK_RValue,
3241                                                SourceLocation());
3242   CallExpr *STCE = new (Context) CallExpr(*Context, DRE, MsgExprs,
3243                                           castType, VK_LValue, SourceLocation());
3244 
3245   FieldDecl *FieldD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
3246                                     SourceLocation(),
3247                                     &Context->Idents.get("s"),
3248                                     returnType, nullptr,
3249                                     /*BitWidth=*/nullptr,
3250                                     /*Mutable=*/true, ICIS_NoInit);
3251   MemberExpr *ME = new (Context) MemberExpr(STCE, false, FieldD, SourceLocation(),
3252                                             FieldD->getType(), VK_LValue,
3253                                             OK_Ordinary);
3254 
3255   return ME;
3256 }
3257 
3258 Stmt *RewriteModernObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
3259                                     SourceLocation StartLoc,
3260                                     SourceLocation EndLoc) {
3261   if (!SelGetUidFunctionDecl)
3262     SynthSelGetUidFunctionDecl();
3263   if (!MsgSendFunctionDecl)
3264     SynthMsgSendFunctionDecl();
3265   if (!MsgSendSuperFunctionDecl)
3266     SynthMsgSendSuperFunctionDecl();
3267   if (!MsgSendStretFunctionDecl)
3268     SynthMsgSendStretFunctionDecl();
3269   if (!MsgSendSuperStretFunctionDecl)
3270     SynthMsgSendSuperStretFunctionDecl();
3271   if (!MsgSendFpretFunctionDecl)
3272     SynthMsgSendFpretFunctionDecl();
3273   if (!GetClassFunctionDecl)
3274     SynthGetClassFunctionDecl();
3275   if (!GetSuperClassFunctionDecl)
3276     SynthGetSuperClassFunctionDecl();
3277   if (!GetMetaClassFunctionDecl)
3278     SynthGetMetaClassFunctionDecl();
3279 
3280   // default to objc_msgSend().
3281   FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
3282   // May need to use objc_msgSend_stret() as well.
3283   FunctionDecl *MsgSendStretFlavor = nullptr;
3284   if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
3285     QualType resultType = mDecl->getReturnType();
3286     if (resultType->isRecordType())
3287       MsgSendStretFlavor = MsgSendStretFunctionDecl;
3288     else if (resultType->isRealFloatingType())
3289       MsgSendFlavor = MsgSendFpretFunctionDecl;
3290   }
3291 
3292   // Synthesize a call to objc_msgSend().
3293   SmallVector<Expr*, 8> MsgExprs;
3294   switch (Exp->getReceiverKind()) {
3295   case ObjCMessageExpr::SuperClass: {
3296     MsgSendFlavor = MsgSendSuperFunctionDecl;
3297     if (MsgSendStretFlavor)
3298       MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3299     assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3300 
3301     ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3302 
3303     SmallVector<Expr*, 4> InitExprs;
3304 
3305     // set the receiver to self, the first argument to all methods.
3306     InitExprs.push_back(
3307       NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3308                                CK_BitCast,
3309                    new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
3310                                              false,
3311                                              Context->getObjCIdType(),
3312                                              VK_RValue,
3313                                              SourceLocation()))
3314                         ); // set the 'receiver'.
3315 
3316     // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3317     SmallVector<Expr*, 8> ClsExprs;
3318     ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3319     // (Class)objc_getClass("CurrentClass")
3320     CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
3321                                                  &ClsExprs[0],
3322                                                  ClsExprs.size(),
3323                                                  StartLoc,
3324                                                  EndLoc);
3325     ClsExprs.clear();
3326     ClsExprs.push_back(Cls);
3327     Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl,
3328                                        &ClsExprs[0], ClsExprs.size(),
3329                                        StartLoc, EndLoc);
3330 
3331     // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3332     // To turn off a warning, type-cast to 'id'
3333     InitExprs.push_back( // set 'super class', using class_getSuperclass().
3334                         NoTypeInfoCStyleCastExpr(Context,
3335                                                  Context->getObjCIdType(),
3336                                                  CK_BitCast, Cls));
3337     // struct __rw_objc_super
3338     QualType superType = getSuperStructType();
3339     Expr *SuperRep;
3340 
3341     if (LangOpts.MicrosoftExt) {
3342       SynthSuperConstructorFunctionDecl();
3343       // Simulate a constructor call...
3344       DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperConstructorFunctionDecl,
3345                                                    false, superType, VK_LValue,
3346                                                    SourceLocation());
3347       SuperRep = new (Context) CallExpr(*Context, DRE, InitExprs,
3348                                         superType, VK_LValue,
3349                                         SourceLocation());
3350       // The code for super is a little tricky to prevent collision with
3351       // the structure definition in the header. The rewriter has it's own
3352       // internal definition (__rw_objc_super) that is uses. This is why
3353       // we need the cast below. For example:
3354       // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3355       //
3356       SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
3357                                Context->getPointerType(SuperRep->getType()),
3358                                              VK_RValue, OK_Ordinary,
3359                                              SourceLocation());
3360       SuperRep = NoTypeInfoCStyleCastExpr(Context,
3361                                           Context->getPointerType(superType),
3362                                           CK_BitCast, SuperRep);
3363     } else {
3364       // (struct __rw_objc_super) { <exprs from above> }
3365       InitListExpr *ILE =
3366         new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3367                                    SourceLocation());
3368       TypeSourceInfo *superTInfo
3369         = Context->getTrivialTypeSourceInfo(superType);
3370       SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3371                                                    superType, VK_LValue,
3372                                                    ILE, false);
3373       // struct __rw_objc_super *
3374       SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
3375                                Context->getPointerType(SuperRep->getType()),
3376                                              VK_RValue, OK_Ordinary,
3377                                              SourceLocation());
3378     }
3379     MsgExprs.push_back(SuperRep);
3380     break;
3381   }
3382 
3383   case ObjCMessageExpr::Class: {
3384     SmallVector<Expr*, 8> ClsExprs;
3385     ObjCInterfaceDecl *Class
3386       = Exp->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
3387     IdentifierInfo *clsName = Class->getIdentifier();
3388     ClsExprs.push_back(getStringLiteral(clsName->getName()));
3389     CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
3390                                                  &ClsExprs[0],
3391                                                  ClsExprs.size(),
3392                                                  StartLoc, EndLoc);
3393     CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
3394                                                  Context->getObjCIdType(),
3395                                                  CK_BitCast, Cls);
3396     MsgExprs.push_back(ArgExpr);
3397     break;
3398   }
3399 
3400   case ObjCMessageExpr::SuperInstance:{
3401     MsgSendFlavor = MsgSendSuperFunctionDecl;
3402     if (MsgSendStretFlavor)
3403       MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3404     assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3405     ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3406     SmallVector<Expr*, 4> InitExprs;
3407 
3408     InitExprs.push_back(
3409       NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3410                                CK_BitCast,
3411                    new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
3412                                              false,
3413                                              Context->getObjCIdType(),
3414                                              VK_RValue, SourceLocation()))
3415                         ); // set the 'receiver'.
3416 
3417     // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3418     SmallVector<Expr*, 8> ClsExprs;
3419     ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3420     // (Class)objc_getClass("CurrentClass")
3421     CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
3422                                                  &ClsExprs[0],
3423                                                  ClsExprs.size(),
3424                                                  StartLoc, EndLoc);
3425     ClsExprs.clear();
3426     ClsExprs.push_back(Cls);
3427     Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl,
3428                                        &ClsExprs[0], ClsExprs.size(),
3429                                        StartLoc, EndLoc);
3430 
3431     // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3432     // To turn off a warning, type-cast to 'id'
3433     InitExprs.push_back(
3434       // set 'super class', using class_getSuperclass().
3435       NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3436                                CK_BitCast, Cls));
3437     // struct __rw_objc_super
3438     QualType superType = getSuperStructType();
3439     Expr *SuperRep;
3440 
3441     if (LangOpts.MicrosoftExt) {
3442       SynthSuperConstructorFunctionDecl();
3443       // Simulate a constructor call...
3444       DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperConstructorFunctionDecl,
3445                                                    false, superType, VK_LValue,
3446                                                    SourceLocation());
3447       SuperRep = new (Context) CallExpr(*Context, DRE, InitExprs,
3448                                         superType, VK_LValue, SourceLocation());
3449       // The code for super is a little tricky to prevent collision with
3450       // the structure definition in the header. The rewriter has it's own
3451       // internal definition (__rw_objc_super) that is uses. This is why
3452       // we need the cast below. For example:
3453       // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3454       //
3455       SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
3456                                Context->getPointerType(SuperRep->getType()),
3457                                VK_RValue, OK_Ordinary,
3458                                SourceLocation());
3459       SuperRep = NoTypeInfoCStyleCastExpr(Context,
3460                                Context->getPointerType(superType),
3461                                CK_BitCast, SuperRep);
3462     } else {
3463       // (struct __rw_objc_super) { <exprs from above> }
3464       InitListExpr *ILE =
3465         new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3466                                    SourceLocation());
3467       TypeSourceInfo *superTInfo
3468         = Context->getTrivialTypeSourceInfo(superType);
3469       SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3470                                                    superType, VK_RValue, ILE,
3471                                                    false);
3472     }
3473     MsgExprs.push_back(SuperRep);
3474     break;
3475   }
3476 
3477   case ObjCMessageExpr::Instance: {
3478     // Remove all type-casts because it may contain objc-style types; e.g.
3479     // Foo<Proto> *.
3480     Expr *recExpr = Exp->getInstanceReceiver();
3481     while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
3482       recExpr = CE->getSubExpr();
3483     CastKind CK = recExpr->getType()->isObjCObjectPointerType()
3484                     ? CK_BitCast : recExpr->getType()->isBlockPointerType()
3485                                      ? CK_BlockPointerToObjCPointerCast
3486                                      : CK_CPointerToObjCPointerCast;
3487 
3488     recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3489                                        CK, recExpr);
3490     MsgExprs.push_back(recExpr);
3491     break;
3492   }
3493   }
3494 
3495   // Create a call to sel_registerName("selName"), it will be the 2nd argument.
3496   SmallVector<Expr*, 8> SelExprs;
3497   SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
3498   CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
3499                                                  &SelExprs[0], SelExprs.size(),
3500                                                   StartLoc,
3501                                                   EndLoc);
3502   MsgExprs.push_back(SelExp);
3503 
3504   // Now push any user supplied arguments.
3505   for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
3506     Expr *userExpr = Exp->getArg(i);
3507     // Make all implicit casts explicit...ICE comes in handy:-)
3508     if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
3509       // Reuse the ICE type, it is exactly what the doctor ordered.
3510       QualType type = ICE->getType();
3511       if (needToScanForQualifiers(type))
3512         type = Context->getObjCIdType();
3513       // Make sure we convert "type (^)(...)" to "type (*)(...)".
3514       (void)convertBlockPointerToFunctionPointer(type);
3515       const Expr *SubExpr = ICE->IgnoreParenImpCasts();
3516       CastKind CK;
3517       if (SubExpr->getType()->isIntegralType(*Context) &&
3518           type->isBooleanType()) {
3519         CK = CK_IntegralToBoolean;
3520       } else if (type->isObjCObjectPointerType()) {
3521         if (SubExpr->getType()->isBlockPointerType()) {
3522           CK = CK_BlockPointerToObjCPointerCast;
3523         } else if (SubExpr->getType()->isPointerType()) {
3524           CK = CK_CPointerToObjCPointerCast;
3525         } else {
3526           CK = CK_BitCast;
3527         }
3528       } else {
3529         CK = CK_BitCast;
3530       }
3531 
3532       userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, userExpr);
3533     }
3534     // Make id<P...> cast into an 'id' cast.
3535     else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
3536       if (CE->getType()->isObjCQualifiedIdType()) {
3537         while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
3538           userExpr = CE->getSubExpr();
3539         CastKind CK;
3540         if (userExpr->getType()->isIntegralType(*Context)) {
3541           CK = CK_IntegralToPointer;
3542         } else if (userExpr->getType()->isBlockPointerType()) {
3543           CK = CK_BlockPointerToObjCPointerCast;
3544         } else if (userExpr->getType()->isPointerType()) {
3545           CK = CK_CPointerToObjCPointerCast;
3546         } else {
3547           CK = CK_BitCast;
3548         }
3549         userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3550                                             CK, userExpr);
3551       }
3552     }
3553     MsgExprs.push_back(userExpr);
3554     // We've transferred the ownership to MsgExprs. For now, we *don't* null
3555     // out the argument in the original expression (since we aren't deleting
3556     // the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
3557     //Exp->setArg(i, 0);
3558   }
3559   // Generate the funky cast.
3560   CastExpr *cast;
3561   SmallVector<QualType, 8> ArgTypes;
3562   QualType returnType;
3563 
3564   // Push 'id' and 'SEL', the 2 implicit arguments.
3565   if (MsgSendFlavor == MsgSendSuperFunctionDecl)
3566     ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
3567   else
3568     ArgTypes.push_back(Context->getObjCIdType());
3569   ArgTypes.push_back(Context->getObjCSelType());
3570   if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
3571     // Push any user argument types.
3572     for (const auto *PI : OMD->params()) {
3573       QualType t = PI->getType()->isObjCQualifiedIdType()
3574                      ? Context->getObjCIdType()
3575                      : PI->getType();
3576       // Make sure we convert "t (^)(...)" to "t (*)(...)".
3577       (void)convertBlockPointerToFunctionPointer(t);
3578       ArgTypes.push_back(t);
3579     }
3580     returnType = Exp->getType();
3581     convertToUnqualifiedObjCType(returnType);
3582     (void)convertBlockPointerToFunctionPointer(returnType);
3583   } else {
3584     returnType = Context->getObjCIdType();
3585   }
3586   // Get the type, we will need to reference it in a couple spots.
3587   QualType msgSendType = MsgSendFlavor->getType();
3588 
3589   // Create a reference to the objc_msgSend() declaration.
3590   DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, false, msgSendType,
3591                                                VK_LValue, SourceLocation());
3592 
3593   // Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
3594   // If we don't do this cast, we get the following bizarre warning/note:
3595   // xx.m:13: warning: function called through a non-compatible type
3596   // xx.m:13: note: if this code is reached, the program will abort
3597   cast = NoTypeInfoCStyleCastExpr(Context,
3598                                   Context->getPointerType(Context->VoidTy),
3599                                   CK_BitCast, DRE);
3600 
3601   // Now do the "normal" pointer to function cast.
3602   // If we don't have a method decl, force a variadic cast.
3603   const ObjCMethodDecl *MD = Exp->getMethodDecl();
3604   QualType castType =
3605     getSimpleFunctionType(returnType, ArgTypes, MD ? MD->isVariadic() : true);
3606   castType = Context->getPointerType(castType);
3607   cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
3608                                   cast);
3609 
3610   // Don't forget the parens to enforce the proper binding.
3611   ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
3612 
3613   const FunctionType *FT = msgSendType->getAs<FunctionType>();
3614   CallExpr *CE = new (Context)
3615       CallExpr(*Context, PE, MsgExprs, FT->getReturnType(), VK_RValue, EndLoc);
3616   Stmt *ReplacingStmt = CE;
3617   if (MsgSendStretFlavor) {
3618     // We have the method which returns a struct/union. Must also generate
3619     // call to objc_msgSend_stret and hang both varieties on a conditional
3620     // expression which dictate which one to envoke depending on size of
3621     // method's return type.
3622 
3623     Expr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
3624                                            returnType,
3625                                            ArgTypes, MsgExprs,
3626                                            Exp->getMethodDecl());
3627     ReplacingStmt = STCE;
3628   }
3629   // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3630   return ReplacingStmt;
3631 }
3632 
3633 Stmt *RewriteModernObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
3634   Stmt *ReplacingStmt = SynthMessageExpr(Exp, Exp->getLocStart(),
3635                                          Exp->getLocEnd());
3636 
3637   // Now do the actual rewrite.
3638   ReplaceStmt(Exp, ReplacingStmt);
3639 
3640   // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3641   return ReplacingStmt;
3642 }
3643 
3644 // typedef struct objc_object Protocol;
3645 QualType RewriteModernObjC::getProtocolType() {
3646   if (!ProtocolTypeDecl) {
3647     TypeSourceInfo *TInfo
3648       = Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
3649     ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
3650                                            SourceLocation(), SourceLocation(),
3651                                            &Context->Idents.get("Protocol"),
3652                                            TInfo);
3653   }
3654   return Context->getTypeDeclType(ProtocolTypeDecl);
3655 }
3656 
3657 /// RewriteObjCProtocolExpr - Rewrite a protocol expression into
3658 /// a synthesized/forward data reference (to the protocol's metadata).
3659 /// The forward references (and metadata) are generated in
3660 /// RewriteModernObjC::HandleTranslationUnit().
3661 Stmt *RewriteModernObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
3662   std::string Name = "_OBJC_PROTOCOL_REFERENCE_$_" +
3663                       Exp->getProtocol()->getNameAsString();
3664   IdentifierInfo *ID = &Context->Idents.get(Name);
3665   VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
3666                                 SourceLocation(), ID, getProtocolType(),
3667                                 nullptr, SC_Extern);
3668   DeclRefExpr *DRE = new (Context) DeclRefExpr(VD, false, getProtocolType(),
3669                                                VK_LValue, SourceLocation());
3670   CastExpr *castExpr =
3671     NoTypeInfoCStyleCastExpr(
3672       Context, Context->getPointerType(DRE->getType()), CK_BitCast, DRE);
3673   ReplaceStmt(Exp, castExpr);
3674   ProtocolExprDecls.insert(Exp->getProtocol()->getCanonicalDecl());
3675   // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3676   return castExpr;
3677 
3678 }
3679 
3680 bool RewriteModernObjC::BufferContainsPPDirectives(const char *startBuf,
3681                                              const char *endBuf) {
3682   while (startBuf < endBuf) {
3683     if (*startBuf == '#') {
3684       // Skip whitespace.
3685       for (++startBuf; startBuf[0] == ' ' || startBuf[0] == '\t'; ++startBuf)
3686         ;
3687       if (!strncmp(startBuf, "if", strlen("if")) ||
3688           !strncmp(startBuf, "ifdef", strlen("ifdef")) ||
3689           !strncmp(startBuf, "ifndef", strlen("ifndef")) ||
3690           !strncmp(startBuf, "define", strlen("define")) ||
3691           !strncmp(startBuf, "undef", strlen("undef")) ||
3692           !strncmp(startBuf, "else", strlen("else")) ||
3693           !strncmp(startBuf, "elif", strlen("elif")) ||
3694           !strncmp(startBuf, "endif", strlen("endif")) ||
3695           !strncmp(startBuf, "pragma", strlen("pragma")) ||
3696           !strncmp(startBuf, "include", strlen("include")) ||
3697           !strncmp(startBuf, "import", strlen("import")) ||
3698           !strncmp(startBuf, "include_next", strlen("include_next")))
3699         return true;
3700     }
3701     startBuf++;
3702   }
3703   return false;
3704 }
3705 
3706 /// IsTagDefinedInsideClass - This routine checks that a named tagged type
3707 /// is defined inside an objective-c class. If so, it returns true.
3708 bool RewriteModernObjC::IsTagDefinedInsideClass(ObjCContainerDecl *IDecl,
3709                                                 TagDecl *Tag,
3710                                                 bool &IsNamedDefinition) {
3711   if (!IDecl)
3712     return false;
3713   SourceLocation TagLocation;
3714   if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) {
3715     RD = RD->getDefinition();
3716     if (!RD || !RD->getDeclName().getAsIdentifierInfo())
3717       return false;
3718     IsNamedDefinition = true;
3719     TagLocation = RD->getLocation();
3720     return Context->getSourceManager().isBeforeInTranslationUnit(
3721                                           IDecl->getLocation(), TagLocation);
3722   }
3723   if (EnumDecl *ED = dyn_cast<EnumDecl>(Tag)) {
3724     if (!ED || !ED->getDeclName().getAsIdentifierInfo())
3725       return false;
3726     IsNamedDefinition = true;
3727     TagLocation = ED->getLocation();
3728     return Context->getSourceManager().isBeforeInTranslationUnit(
3729                                           IDecl->getLocation(), TagLocation);
3730 
3731   }
3732   return false;
3733 }
3734 
3735 /// RewriteObjCFieldDeclType - This routine rewrites a type into the buffer.
3736 /// It handles elaborated types, as well as enum types in the process.
3737 bool RewriteModernObjC::RewriteObjCFieldDeclType(QualType &Type,
3738                                                  std::string &Result) {
3739   if (isa<TypedefType>(Type)) {
3740     Result += "\t";
3741     return false;
3742   }
3743 
3744   if (Type->isArrayType()) {
3745     QualType ElemTy = Context->getBaseElementType(Type);
3746     return RewriteObjCFieldDeclType(ElemTy, Result);
3747   }
3748   else if (Type->isRecordType()) {
3749     RecordDecl *RD = Type->getAs<RecordType>()->getDecl();
3750     if (RD->isCompleteDefinition()) {
3751       if (RD->isStruct())
3752         Result += "\n\tstruct ";
3753       else if (RD->isUnion())
3754         Result += "\n\tunion ";
3755       else
3756         assert(false && "class not allowed as an ivar type");
3757 
3758       Result += RD->getName();
3759       if (GlobalDefinedTags.count(RD)) {
3760         // struct/union is defined globally, use it.
3761         Result += " ";
3762         return true;
3763       }
3764       Result += " {\n";
3765       for (auto *FD : RD->fields())
3766         RewriteObjCFieldDecl(FD, Result);
3767       Result += "\t} ";
3768       return true;
3769     }
3770   }
3771   else if (Type->isEnumeralType()) {
3772     EnumDecl *ED = Type->getAs<EnumType>()->getDecl();
3773     if (ED->isCompleteDefinition()) {
3774       Result += "\n\tenum ";
3775       Result += ED->getName();
3776       if (GlobalDefinedTags.count(ED)) {
3777         // Enum is globall defined, use it.
3778         Result += " ";
3779         return true;
3780       }
3781 
3782       Result += " {\n";
3783       for (const auto *EC : ED->enumerators()) {
3784         Result += "\t"; Result += EC->getName(); Result += " = ";
3785         llvm::APSInt Val = EC->getInitVal();
3786         Result += Val.toString(10);
3787         Result += ",\n";
3788       }
3789       Result += "\t} ";
3790       return true;
3791     }
3792   }
3793 
3794   Result += "\t";
3795   convertObjCTypeToCStyleType(Type);
3796   return false;
3797 }
3798 
3799 
3800 /// RewriteObjCFieldDecl - This routine rewrites a field into the buffer.
3801 /// It handles elaborated types, as well as enum types in the process.
3802 void RewriteModernObjC::RewriteObjCFieldDecl(FieldDecl *fieldDecl,
3803                                              std::string &Result) {
3804   QualType Type = fieldDecl->getType();
3805   std::string Name = fieldDecl->getNameAsString();
3806 
3807   bool EleboratedType = RewriteObjCFieldDeclType(Type, Result);
3808   if (!EleboratedType)
3809     Type.getAsStringInternal(Name, Context->getPrintingPolicy());
3810   Result += Name;
3811   if (fieldDecl->isBitField()) {
3812     Result += " : "; Result += utostr(fieldDecl->getBitWidthValue(*Context));
3813   }
3814   else if (EleboratedType && Type->isArrayType()) {
3815     const ArrayType *AT = Context->getAsArrayType(Type);
3816     do {
3817       if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
3818         Result += "[";
3819         llvm::APInt Dim = CAT->getSize();
3820         Result += utostr(Dim.getZExtValue());
3821         Result += "]";
3822       }
3823       AT = Context->getAsArrayType(AT->getElementType());
3824     } while (AT);
3825   }
3826 
3827   Result += ";\n";
3828 }
3829 
3830 /// RewriteLocallyDefinedNamedAggregates - This routine rewrites locally defined
3831 /// named aggregate types into the input buffer.
3832 void RewriteModernObjC::RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
3833                                              std::string &Result) {
3834   QualType Type = fieldDecl->getType();
3835   if (isa<TypedefType>(Type))
3836     return;
3837   if (Type->isArrayType())
3838     Type = Context->getBaseElementType(Type);
3839   ObjCContainerDecl *IDecl =
3840     dyn_cast<ObjCContainerDecl>(fieldDecl->getDeclContext());
3841 
3842   TagDecl *TD = nullptr;
3843   if (Type->isRecordType()) {
3844     TD = Type->getAs<RecordType>()->getDecl();
3845   }
3846   else if (Type->isEnumeralType()) {
3847     TD = Type->getAs<EnumType>()->getDecl();
3848   }
3849 
3850   if (TD) {
3851     if (GlobalDefinedTags.count(TD))
3852       return;
3853 
3854     bool IsNamedDefinition = false;
3855     if (IsTagDefinedInsideClass(IDecl, TD, IsNamedDefinition)) {
3856       RewriteObjCFieldDeclType(Type, Result);
3857       Result += ";";
3858     }
3859     if (IsNamedDefinition)
3860       GlobalDefinedTags.insert(TD);
3861   }
3862 
3863 }
3864 
3865 unsigned RewriteModernObjC::ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV) {
3866   const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3867   if (ObjCInterefaceHasBitfieldGroups.count(CDecl)) {
3868     return IvarGroupNumber[IV];
3869   }
3870   unsigned GroupNo = 0;
3871   SmallVector<const ObjCIvarDecl *, 8> IVars;
3872   for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3873        IVD; IVD = IVD->getNextIvar())
3874     IVars.push_back(IVD);
3875 
3876   for (unsigned i = 0, e = IVars.size(); i < e; i++)
3877     if (IVars[i]->isBitField()) {
3878       IvarGroupNumber[IVars[i++]] = ++GroupNo;
3879       while (i < e && IVars[i]->isBitField())
3880         IvarGroupNumber[IVars[i++]] = GroupNo;
3881       if (i < e)
3882         --i;
3883     }
3884 
3885   ObjCInterefaceHasBitfieldGroups.insert(CDecl);
3886   return IvarGroupNumber[IV];
3887 }
3888 
3889 QualType RewriteModernObjC::SynthesizeBitfieldGroupStructType(
3890                               ObjCIvarDecl *IV,
3891                               SmallVectorImpl<ObjCIvarDecl *> &IVars) {
3892   std::string StructTagName;
3893   ObjCIvarBitfieldGroupType(IV, StructTagName);
3894   RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct,
3895                                       Context->getTranslationUnitDecl(),
3896                                       SourceLocation(), SourceLocation(),
3897                                       &Context->Idents.get(StructTagName));
3898   for (unsigned i=0, e = IVars.size(); i < e; i++) {
3899     ObjCIvarDecl *Ivar = IVars[i];
3900     RD->addDecl(FieldDecl::Create(*Context, RD, SourceLocation(), SourceLocation(),
3901                                   &Context->Idents.get(Ivar->getName()),
3902                                   Ivar->getType(),
3903                                   nullptr, /*Expr *BW */Ivar->getBitWidth(),
3904                                   false, ICIS_NoInit));
3905   }
3906   RD->completeDefinition();
3907   return Context->getTagDeclType(RD);
3908 }
3909 
3910 QualType RewriteModernObjC::GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV) {
3911   const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3912   unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3913   std::pair<const ObjCInterfaceDecl*, unsigned> tuple = std::make_pair(CDecl, GroupNo);
3914   if (GroupRecordType.count(tuple))
3915     return GroupRecordType[tuple];
3916 
3917   SmallVector<ObjCIvarDecl *, 8> IVars;
3918   for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3919        IVD; IVD = IVD->getNextIvar()) {
3920     if (IVD->isBitField())
3921       IVars.push_back(const_cast<ObjCIvarDecl *>(IVD));
3922     else {
3923       if (!IVars.empty()) {
3924         unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3925         // Generate the struct type for this group of bitfield ivars.
3926         GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3927           SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3928         IVars.clear();
3929       }
3930     }
3931   }
3932   if (!IVars.empty()) {
3933     // Do the last one.
3934     unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3935     GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3936       SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3937   }
3938   QualType RetQT = GroupRecordType[tuple];
3939   assert(!RetQT.isNull() && "GetGroupRecordTypeForObjCIvarBitfield struct type is NULL");
3940 
3941   return RetQT;
3942 }
3943 
3944 /// ObjCIvarBitfieldGroupDecl - Names field decl. for ivar bitfield group.
3945 /// Name would be: classname__GRBF_n where n is the group number for this ivar.
3946 void RewriteModernObjC::ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV,
3947                                                   std::string &Result) {
3948   const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3949   Result += CDecl->getName();
3950   Result += "__GRBF_";
3951   unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3952   Result += utostr(GroupNo);
3953   return;
3954 }
3955 
3956 /// ObjCIvarBitfieldGroupType - Names struct type for ivar bitfield group.
3957 /// Name of the struct would be: classname__T_n where n is the group number for
3958 /// this ivar.
3959 void RewriteModernObjC::ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV,
3960                                                   std::string &Result) {
3961   const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3962   Result += CDecl->getName();
3963   Result += "__T_";
3964   unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3965   Result += utostr(GroupNo);
3966   return;
3967 }
3968 
3969 /// ObjCIvarBitfieldGroupOffset - Names symbol for ivar bitfield group field offset.
3970 /// Name would be: OBJC_IVAR_$_classname__GRBF_n where n is the group number for
3971 /// this ivar.
3972 void RewriteModernObjC::ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV,
3973                                                     std::string &Result) {
3974   Result += "OBJC_IVAR_$_";
3975   ObjCIvarBitfieldGroupDecl(IV, Result);
3976 }
3977 
3978 #define SKIP_BITFIELDS(IX, ENDIX, VEC) { \
3979       while ((IX < ENDIX) && VEC[IX]->isBitField()) \
3980         ++IX; \
3981       if (IX < ENDIX) \
3982         --IX; \
3983 }
3984 
3985 /// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
3986 /// an objective-c class with ivars.
3987 void RewriteModernObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
3988                                                std::string &Result) {
3989   assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
3990   assert(CDecl->getName() != "" &&
3991          "Name missing in SynthesizeObjCInternalStruct");
3992   ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
3993   SmallVector<ObjCIvarDecl *, 8> IVars;
3994   for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3995        IVD; IVD = IVD->getNextIvar())
3996     IVars.push_back(IVD);
3997 
3998   SourceLocation LocStart = CDecl->getLocStart();
3999   SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
4000 
4001   const char *startBuf = SM->getCharacterData(LocStart);
4002   const char *endBuf = SM->getCharacterData(LocEnd);
4003 
4004   // If no ivars and no root or if its root, directly or indirectly,
4005   // have no ivars (thus not synthesized) then no need to synthesize this class.
4006   if ((!CDecl->isThisDeclarationADefinition() || IVars.size() == 0) &&
4007       (!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
4008     endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
4009     ReplaceText(LocStart, endBuf-startBuf, Result);
4010     return;
4011   }
4012 
4013   // Insert named struct/union definitions inside class to
4014   // outer scope. This follows semantics of locally defined
4015   // struct/unions in objective-c classes.
4016   for (unsigned i = 0, e = IVars.size(); i < e; i++)
4017     RewriteLocallyDefinedNamedAggregates(IVars[i], Result);
4018 
4019   // Insert named structs which are syntheized to group ivar bitfields
4020   // to outer scope as well.
4021   for (unsigned i = 0, e = IVars.size(); i < e; i++)
4022     if (IVars[i]->isBitField()) {
4023       ObjCIvarDecl *IV = IVars[i];
4024       QualType QT = GetGroupRecordTypeForObjCIvarBitfield(IV);
4025       RewriteObjCFieldDeclType(QT, Result);
4026       Result += ";";
4027       // skip over ivar bitfields in this group.
4028       SKIP_BITFIELDS(i , e, IVars);
4029     }
4030 
4031   Result += "\nstruct ";
4032   Result += CDecl->getNameAsString();
4033   Result += "_IMPL {\n";
4034 
4035   if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
4036     Result += "\tstruct "; Result += RCDecl->getNameAsString();
4037     Result += "_IMPL "; Result += RCDecl->getNameAsString();
4038     Result += "_IVARS;\n";
4039   }
4040 
4041   for (unsigned i = 0, e = IVars.size(); i < e; i++) {
4042     if (IVars[i]->isBitField()) {
4043       ObjCIvarDecl *IV = IVars[i];
4044       Result += "\tstruct ";
4045       ObjCIvarBitfieldGroupType(IV, Result); Result += " ";
4046       ObjCIvarBitfieldGroupDecl(IV, Result); Result += ";\n";
4047       // skip over ivar bitfields in this group.
4048       SKIP_BITFIELDS(i , e, IVars);
4049     }
4050     else
4051       RewriteObjCFieldDecl(IVars[i], Result);
4052   }
4053 
4054   Result += "};\n";
4055   endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
4056   ReplaceText(LocStart, endBuf-startBuf, Result);
4057   // Mark this struct as having been generated.
4058   if (!ObjCSynthesizedStructs.insert(CDecl))
4059     llvm_unreachable("struct already synthesize- RewriteObjCInternalStruct");
4060 }
4061 
4062 /// RewriteIvarOffsetSymbols - Rewrite ivar offset symbols of those ivars which
4063 /// have been referenced in an ivar access expression.
4064 void RewriteModernObjC::RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
4065                                                   std::string &Result) {
4066   // write out ivar offset symbols which have been referenced in an ivar
4067   // access expression.
4068   llvm::SmallPtrSet<ObjCIvarDecl *, 8> Ivars = ReferencedIvars[CDecl];
4069   if (Ivars.empty())
4070     return;
4071 
4072   llvm::DenseSet<std::pair<const ObjCInterfaceDecl*, unsigned> > GroupSymbolOutput;
4073   for (llvm::SmallPtrSet<ObjCIvarDecl *, 8>::iterator i = Ivars.begin(),
4074        e = Ivars.end(); i != e; i++) {
4075     ObjCIvarDecl *IvarDecl = (*i);
4076     const ObjCInterfaceDecl *IDecl = IvarDecl->getContainingInterface();
4077     unsigned GroupNo = 0;
4078     if (IvarDecl->isBitField()) {
4079       GroupNo = ObjCIvarBitfieldGroupNo(IvarDecl);
4080       if (GroupSymbolOutput.count(std::make_pair(IDecl, GroupNo)))
4081         continue;
4082     }
4083     Result += "\n";
4084     if (LangOpts.MicrosoftExt)
4085       Result += "__declspec(allocate(\".objc_ivar$B\")) ";
4086     Result += "extern \"C\" ";
4087     if (LangOpts.MicrosoftExt &&
4088         IvarDecl->getAccessControl() != ObjCIvarDecl::Private &&
4089         IvarDecl->getAccessControl() != ObjCIvarDecl::Package)
4090         Result += "__declspec(dllimport) ";
4091 
4092     Result += "unsigned long ";
4093     if (IvarDecl->isBitField()) {
4094       ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
4095       GroupSymbolOutput.insert(std::make_pair(IDecl, GroupNo));
4096     }
4097     else
4098       WriteInternalIvarName(CDecl, IvarDecl, Result);
4099     Result += ";";
4100   }
4101 }
4102 
4103 //===----------------------------------------------------------------------===//
4104 // Meta Data Emission
4105 //===----------------------------------------------------------------------===//
4106 
4107 
4108 /// RewriteImplementations - This routine rewrites all method implementations
4109 /// and emits meta-data.
4110 
4111 void RewriteModernObjC::RewriteImplementations() {
4112   int ClsDefCount = ClassImplementation.size();
4113   int CatDefCount = CategoryImplementation.size();
4114 
4115   // Rewrite implemented methods
4116   for (int i = 0; i < ClsDefCount; i++) {
4117     ObjCImplementationDecl *OIMP = ClassImplementation[i];
4118     ObjCInterfaceDecl *CDecl = OIMP->getClassInterface();
4119     if (CDecl->isImplicitInterfaceDecl())
4120       assert(false &&
4121              "Legacy implicit interface rewriting not supported in moder abi");
4122     RewriteImplementationDecl(OIMP);
4123   }
4124 
4125   for (int i = 0; i < CatDefCount; i++) {
4126     ObjCCategoryImplDecl *CIMP = CategoryImplementation[i];
4127     ObjCInterfaceDecl *CDecl = CIMP->getClassInterface();
4128     if (CDecl->isImplicitInterfaceDecl())
4129       assert(false &&
4130              "Legacy implicit interface rewriting not supported in moder abi");
4131     RewriteImplementationDecl(CIMP);
4132   }
4133 }
4134 
4135 void RewriteModernObjC::RewriteByRefString(std::string &ResultStr,
4136                                      const std::string &Name,
4137                                      ValueDecl *VD, bool def) {
4138   assert(BlockByRefDeclNo.count(VD) &&
4139          "RewriteByRefString: ByRef decl missing");
4140   if (def)
4141     ResultStr += "struct ";
4142   ResultStr += "__Block_byref_" + Name +
4143     "_" + utostr(BlockByRefDeclNo[VD]) ;
4144 }
4145 
4146 static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
4147   if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4148     return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
4149   return false;
4150 }
4151 
4152 std::string RewriteModernObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
4153                                                    StringRef funcName,
4154                                                    std::string Tag) {
4155   const FunctionType *AFT = CE->getFunctionType();
4156   QualType RT = AFT->getReturnType();
4157   std::string StructRef = "struct " + Tag;
4158   SourceLocation BlockLoc = CE->getExprLoc();
4159   std::string S;
4160   ConvertSourceLocationToLineDirective(BlockLoc, S);
4161 
4162   S += "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
4163          funcName.str() + "_block_func_" + utostr(i);
4164 
4165   BlockDecl *BD = CE->getBlockDecl();
4166 
4167   if (isa<FunctionNoProtoType>(AFT)) {
4168     // No user-supplied arguments. Still need to pass in a pointer to the
4169     // block (to reference imported block decl refs).
4170     S += "(" + StructRef + " *__cself)";
4171   } else if (BD->param_empty()) {
4172     S += "(" + StructRef + " *__cself)";
4173   } else {
4174     const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
4175     assert(FT && "SynthesizeBlockFunc: No function proto");
4176     S += '(';
4177     // first add the implicit argument.
4178     S += StructRef + " *__cself, ";
4179     std::string ParamStr;
4180     for (BlockDecl::param_iterator AI = BD->param_begin(),
4181          E = BD->param_end(); AI != E; ++AI) {
4182       if (AI != BD->param_begin()) S += ", ";
4183       ParamStr = (*AI)->getNameAsString();
4184       QualType QT = (*AI)->getType();
4185       (void)convertBlockPointerToFunctionPointer(QT);
4186       QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
4187       S += ParamStr;
4188     }
4189     if (FT->isVariadic()) {
4190       if (!BD->param_empty()) S += ", ";
4191       S += "...";
4192     }
4193     S += ')';
4194   }
4195   S += " {\n";
4196 
4197   // Create local declarations to avoid rewriting all closure decl ref exprs.
4198   // First, emit a declaration for all "by ref" decls.
4199   for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4200        E = BlockByRefDecls.end(); I != E; ++I) {
4201     S += "  ";
4202     std::string Name = (*I)->getNameAsString();
4203     std::string TypeString;
4204     RewriteByRefString(TypeString, Name, (*I));
4205     TypeString += " *";
4206     Name = TypeString + Name;
4207     S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
4208   }
4209   // Next, emit a declaration for all "by copy" declarations.
4210   for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4211        E = BlockByCopyDecls.end(); I != E; ++I) {
4212     S += "  ";
4213     // Handle nested closure invocation. For example:
4214     //
4215     //   void (^myImportedClosure)(void);
4216     //   myImportedClosure  = ^(void) { setGlobalInt(x + y); };
4217     //
4218     //   void (^anotherClosure)(void);
4219     //   anotherClosure = ^(void) {
4220     //     myImportedClosure(); // import and invoke the closure
4221     //   };
4222     //
4223     if (isTopLevelBlockPointerType((*I)->getType())) {
4224       RewriteBlockPointerTypeVariable(S, (*I));
4225       S += " = (";
4226       RewriteBlockPointerType(S, (*I)->getType());
4227       S += ")";
4228       S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
4229     }
4230     else {
4231       std::string Name = (*I)->getNameAsString();
4232       QualType QT = (*I)->getType();
4233       if (HasLocalVariableExternalStorage(*I))
4234         QT = Context->getPointerType(QT);
4235       QT.getAsStringInternal(Name, Context->getPrintingPolicy());
4236       S += Name + " = __cself->" +
4237                               (*I)->getNameAsString() + "; // bound by copy\n";
4238     }
4239   }
4240   std::string RewrittenStr = RewrittenBlockExprs[CE];
4241   const char *cstr = RewrittenStr.c_str();
4242   while (*cstr++ != '{') ;
4243   S += cstr;
4244   S += "\n";
4245   return S;
4246 }
4247 
4248 std::string RewriteModernObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
4249                                                    StringRef funcName,
4250                                                    std::string Tag) {
4251   std::string StructRef = "struct " + Tag;
4252   std::string S = "static void __";
4253 
4254   S += funcName;
4255   S += "_block_copy_" + utostr(i);
4256   S += "(" + StructRef;
4257   S += "*dst, " + StructRef;
4258   S += "*src) {";
4259   for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = ImportedBlockDecls.begin(),
4260       E = ImportedBlockDecls.end(); I != E; ++I) {
4261     ValueDecl *VD = (*I);
4262     S += "_Block_object_assign((void*)&dst->";
4263     S += (*I)->getNameAsString();
4264     S += ", (void*)src->";
4265     S += (*I)->getNameAsString();
4266     if (BlockByRefDeclsPtrSet.count((*I)))
4267       S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4268     else if (VD->getType()->isBlockPointerType())
4269       S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4270     else
4271       S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4272   }
4273   S += "}\n";
4274 
4275   S += "\nstatic void __";
4276   S += funcName;
4277   S += "_block_dispose_" + utostr(i);
4278   S += "(" + StructRef;
4279   S += "*src) {";
4280   for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = ImportedBlockDecls.begin(),
4281       E = ImportedBlockDecls.end(); I != E; ++I) {
4282     ValueDecl *VD = (*I);
4283     S += "_Block_object_dispose((void*)src->";
4284     S += (*I)->getNameAsString();
4285     if (BlockByRefDeclsPtrSet.count((*I)))
4286       S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4287     else if (VD->getType()->isBlockPointerType())
4288       S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4289     else
4290       S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4291   }
4292   S += "}\n";
4293   return S;
4294 }
4295 
4296 std::string RewriteModernObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
4297                                              std::string Desc) {
4298   std::string S = "\nstruct " + Tag;
4299   std::string Constructor = "  " + Tag;
4300 
4301   S += " {\n  struct __block_impl impl;\n";
4302   S += "  struct " + Desc;
4303   S += "* Desc;\n";
4304 
4305   Constructor += "(void *fp, "; // Invoke function pointer.
4306   Constructor += "struct " + Desc; // Descriptor pointer.
4307   Constructor += " *desc";
4308 
4309   if (BlockDeclRefs.size()) {
4310     // Output all "by copy" declarations.
4311     for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4312          E = BlockByCopyDecls.end(); I != E; ++I) {
4313       S += "  ";
4314       std::string FieldName = (*I)->getNameAsString();
4315       std::string ArgName = "_" + FieldName;
4316       // Handle nested closure invocation. For example:
4317       //
4318       //   void (^myImportedBlock)(void);
4319       //   myImportedBlock  = ^(void) { setGlobalInt(x + y); };
4320       //
4321       //   void (^anotherBlock)(void);
4322       //   anotherBlock = ^(void) {
4323       //     myImportedBlock(); // import and invoke the closure
4324       //   };
4325       //
4326       if (isTopLevelBlockPointerType((*I)->getType())) {
4327         S += "struct __block_impl *";
4328         Constructor += ", void *" + ArgName;
4329       } else {
4330         QualType QT = (*I)->getType();
4331         if (HasLocalVariableExternalStorage(*I))
4332           QT = Context->getPointerType(QT);
4333         QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
4334         QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
4335         Constructor += ", " + ArgName;
4336       }
4337       S += FieldName + ";\n";
4338     }
4339     // Output all "by ref" declarations.
4340     for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4341          E = BlockByRefDecls.end(); I != E; ++I) {
4342       S += "  ";
4343       std::string FieldName = (*I)->getNameAsString();
4344       std::string ArgName = "_" + FieldName;
4345       {
4346         std::string TypeString;
4347         RewriteByRefString(TypeString, FieldName, (*I));
4348         TypeString += " *";
4349         FieldName = TypeString + FieldName;
4350         ArgName = TypeString + ArgName;
4351         Constructor += ", " + ArgName;
4352       }
4353       S += FieldName + "; // by ref\n";
4354     }
4355     // Finish writing the constructor.
4356     Constructor += ", int flags=0)";
4357     // Initialize all "by copy" arguments.
4358     bool firsTime = true;
4359     for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4360          E = BlockByCopyDecls.end(); I != E; ++I) {
4361       std::string Name = (*I)->getNameAsString();
4362         if (firsTime) {
4363           Constructor += " : ";
4364           firsTime = false;
4365         }
4366         else
4367           Constructor += ", ";
4368         if (isTopLevelBlockPointerType((*I)->getType()))
4369           Constructor += Name + "((struct __block_impl *)_" + Name + ")";
4370         else
4371           Constructor += Name + "(_" + Name + ")";
4372     }
4373     // Initialize all "by ref" arguments.
4374     for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4375          E = BlockByRefDecls.end(); I != E; ++I) {
4376       std::string Name = (*I)->getNameAsString();
4377       if (firsTime) {
4378         Constructor += " : ";
4379         firsTime = false;
4380       }
4381       else
4382         Constructor += ", ";
4383       Constructor += Name + "(_" + Name + "->__forwarding)";
4384     }
4385 
4386     Constructor += " {\n";
4387     if (GlobalVarDecl)
4388       Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
4389     else
4390       Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
4391     Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
4392 
4393     Constructor += "    Desc = desc;\n";
4394   } else {
4395     // Finish writing the constructor.
4396     Constructor += ", int flags=0) {\n";
4397     if (GlobalVarDecl)
4398       Constructor += "    impl.isa = &_NSConcreteGlobalBlock;\n";
4399     else
4400       Constructor += "    impl.isa = &_NSConcreteStackBlock;\n";
4401     Constructor += "    impl.Flags = flags;\n    impl.FuncPtr = fp;\n";
4402     Constructor += "    Desc = desc;\n";
4403   }
4404   Constructor += "  ";
4405   Constructor += "}\n";
4406   S += Constructor;
4407   S += "};\n";
4408   return S;
4409 }
4410 
4411 std::string RewriteModernObjC::SynthesizeBlockDescriptor(std::string DescTag,
4412                                                    std::string ImplTag, int i,
4413                                                    StringRef FunName,
4414                                                    unsigned hasCopy) {
4415   std::string S = "\nstatic struct " + DescTag;
4416 
4417   S += " {\n  size_t reserved;\n";
4418   S += "  size_t Block_size;\n";
4419   if (hasCopy) {
4420     S += "  void (*copy)(struct ";
4421     S += ImplTag; S += "*, struct ";
4422     S += ImplTag; S += "*);\n";
4423 
4424     S += "  void (*dispose)(struct ";
4425     S += ImplTag; S += "*);\n";
4426   }
4427   S += "} ";
4428 
4429   S += DescTag + "_DATA = { 0, sizeof(struct ";
4430   S += ImplTag + ")";
4431   if (hasCopy) {
4432     S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
4433     S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
4434   }
4435   S += "};\n";
4436   return S;
4437 }
4438 
4439 void RewriteModernObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
4440                                           StringRef FunName) {
4441   bool RewriteSC = (GlobalVarDecl &&
4442                     !Blocks.empty() &&
4443                     GlobalVarDecl->getStorageClass() == SC_Static &&
4444                     GlobalVarDecl->getType().getCVRQualifiers());
4445   if (RewriteSC) {
4446     std::string SC(" void __");
4447     SC += GlobalVarDecl->getNameAsString();
4448     SC += "() {}";
4449     InsertText(FunLocStart, SC);
4450   }
4451 
4452   // Insert closures that were part of the function.
4453   for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
4454     CollectBlockDeclRefInfo(Blocks[i]);
4455     // Need to copy-in the inner copied-in variables not actually used in this
4456     // block.
4457     for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
4458       DeclRefExpr *Exp = InnerDeclRefs[count++];
4459       ValueDecl *VD = Exp->getDecl();
4460       BlockDeclRefs.push_back(Exp);
4461       if (!VD->hasAttr<BlocksAttr>()) {
4462         if (!BlockByCopyDeclsPtrSet.count(VD)) {
4463           BlockByCopyDeclsPtrSet.insert(VD);
4464           BlockByCopyDecls.push_back(VD);
4465         }
4466         continue;
4467       }
4468 
4469       if (!BlockByRefDeclsPtrSet.count(VD)) {
4470         BlockByRefDeclsPtrSet.insert(VD);
4471         BlockByRefDecls.push_back(VD);
4472       }
4473 
4474       // imported objects in the inner blocks not used in the outer
4475       // blocks must be copied/disposed in the outer block as well.
4476       if (VD->getType()->isObjCObjectPointerType() ||
4477           VD->getType()->isBlockPointerType())
4478         ImportedBlockDecls.insert(VD);
4479     }
4480 
4481     std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
4482     std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
4483 
4484     std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
4485 
4486     InsertText(FunLocStart, CI);
4487 
4488     std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
4489 
4490     InsertText(FunLocStart, CF);
4491 
4492     if (ImportedBlockDecls.size()) {
4493       std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
4494       InsertText(FunLocStart, HF);
4495     }
4496     std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
4497                                                ImportedBlockDecls.size() > 0);
4498     InsertText(FunLocStart, BD);
4499 
4500     BlockDeclRefs.clear();
4501     BlockByRefDecls.clear();
4502     BlockByRefDeclsPtrSet.clear();
4503     BlockByCopyDecls.clear();
4504     BlockByCopyDeclsPtrSet.clear();
4505     ImportedBlockDecls.clear();
4506   }
4507   if (RewriteSC) {
4508     // Must insert any 'const/volatile/static here. Since it has been
4509     // removed as result of rewriting of block literals.
4510     std::string SC;
4511     if (GlobalVarDecl->getStorageClass() == SC_Static)
4512       SC = "static ";
4513     if (GlobalVarDecl->getType().isConstQualified())
4514       SC += "const ";
4515     if (GlobalVarDecl->getType().isVolatileQualified())
4516       SC += "volatile ";
4517     if (GlobalVarDecl->getType().isRestrictQualified())
4518       SC += "restrict ";
4519     InsertText(FunLocStart, SC);
4520   }
4521   if (GlobalConstructionExp) {
4522     // extra fancy dance for global literal expression.
4523 
4524     // Always the latest block expression on the block stack.
4525     std::string Tag = "__";
4526     Tag += FunName;
4527     Tag += "_block_impl_";
4528     Tag += utostr(Blocks.size()-1);
4529     std::string globalBuf = "static ";
4530     globalBuf += Tag; globalBuf += " ";
4531     std::string SStr;
4532 
4533     llvm::raw_string_ostream constructorExprBuf(SStr);
4534     GlobalConstructionExp->printPretty(constructorExprBuf, nullptr,
4535                                        PrintingPolicy(LangOpts));
4536     globalBuf += constructorExprBuf.str();
4537     globalBuf += ";\n";
4538     InsertText(FunLocStart, globalBuf);
4539     GlobalConstructionExp = nullptr;
4540   }
4541 
4542   Blocks.clear();
4543   InnerDeclRefsCount.clear();
4544   InnerDeclRefs.clear();
4545   RewrittenBlockExprs.clear();
4546 }
4547 
4548 void RewriteModernObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
4549   SourceLocation FunLocStart =
4550     (!Blocks.empty()) ? getFunctionSourceLocation(*this, FD)
4551                       : FD->getTypeSpecStartLoc();
4552   StringRef FuncName = FD->getName();
4553 
4554   SynthesizeBlockLiterals(FunLocStart, FuncName);
4555 }
4556 
4557 static void BuildUniqueMethodName(std::string &Name,
4558                                   ObjCMethodDecl *MD) {
4559   ObjCInterfaceDecl *IFace = MD->getClassInterface();
4560   Name = IFace->getName();
4561   Name += "__" + MD->getSelector().getAsString();
4562   // Convert colons to underscores.
4563   std::string::size_type loc = 0;
4564   while ((loc = Name.find(":", loc)) != std::string::npos)
4565     Name.replace(loc, 1, "_");
4566 }
4567 
4568 void RewriteModernObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
4569   //fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
4570   //SourceLocation FunLocStart = MD->getLocStart();
4571   SourceLocation FunLocStart = MD->getLocStart();
4572   std::string FuncName;
4573   BuildUniqueMethodName(FuncName, MD);
4574   SynthesizeBlockLiterals(FunLocStart, FuncName);
4575 }
4576 
4577 void RewriteModernObjC::GetBlockDeclRefExprs(Stmt *S) {
4578   for (Stmt::child_range CI = S->children(); CI; ++CI)
4579     if (*CI) {
4580       if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI))
4581         GetBlockDeclRefExprs(CBE->getBody());
4582       else
4583         GetBlockDeclRefExprs(*CI);
4584     }
4585   // Handle specific things.
4586   if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
4587     if (DRE->refersToEnclosingLocal()) {
4588       // FIXME: Handle enums.
4589       if (!isa<FunctionDecl>(DRE->getDecl()))
4590         BlockDeclRefs.push_back(DRE);
4591       if (HasLocalVariableExternalStorage(DRE->getDecl()))
4592         BlockDeclRefs.push_back(DRE);
4593     }
4594   }
4595 
4596   return;
4597 }
4598 
4599 void RewriteModernObjC::GetInnerBlockDeclRefExprs(Stmt *S,
4600                 SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
4601                 llvm::SmallPtrSet<const DeclContext *, 8> &InnerContexts) {
4602   for (Stmt::child_range CI = S->children(); CI; ++CI)
4603     if (*CI) {
4604       if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI)) {
4605         InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
4606         GetInnerBlockDeclRefExprs(CBE->getBody(),
4607                                   InnerBlockDeclRefs,
4608                                   InnerContexts);
4609       }
4610       else
4611         GetInnerBlockDeclRefExprs(*CI,
4612                                   InnerBlockDeclRefs,
4613                                   InnerContexts);
4614 
4615     }
4616   // Handle specific things.
4617   if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
4618     if (DRE->refersToEnclosingLocal()) {
4619       if (!isa<FunctionDecl>(DRE->getDecl()) &&
4620           !InnerContexts.count(DRE->getDecl()->getDeclContext()))
4621         InnerBlockDeclRefs.push_back(DRE);
4622       if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl()))
4623         if (Var->isFunctionOrMethodVarDecl())
4624           ImportedLocalExternalDecls.insert(Var);
4625     }
4626   }
4627 
4628   return;
4629 }
4630 
4631 /// convertObjCTypeToCStyleType - This routine converts such objc types
4632 /// as qualified objects, and blocks to their closest c/c++ types that
4633 /// it can. It returns true if input type was modified.
4634 bool RewriteModernObjC::convertObjCTypeToCStyleType(QualType &T) {
4635   QualType oldT = T;
4636   convertBlockPointerToFunctionPointer(T);
4637   if (T->isFunctionPointerType()) {
4638     QualType PointeeTy;
4639     if (const PointerType* PT = T->getAs<PointerType>()) {
4640       PointeeTy = PT->getPointeeType();
4641       if (const FunctionType *FT = PointeeTy->getAs<FunctionType>()) {
4642         T = convertFunctionTypeOfBlocks(FT);
4643         T = Context->getPointerType(T);
4644       }
4645     }
4646   }
4647 
4648   convertToUnqualifiedObjCType(T);
4649   return T != oldT;
4650 }
4651 
4652 /// convertFunctionTypeOfBlocks - This routine converts a function type
4653 /// whose result type may be a block pointer or whose argument type(s)
4654 /// might be block pointers to an equivalent function type replacing
4655 /// all block pointers to function pointers.
4656 QualType RewriteModernObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
4657   const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4658   // FTP will be null for closures that don't take arguments.
4659   // Generate a funky cast.
4660   SmallVector<QualType, 8> ArgTypes;
4661   QualType Res = FT->getReturnType();
4662   bool modified = convertObjCTypeToCStyleType(Res);
4663 
4664   if (FTP) {
4665     for (auto &I : FTP->param_types()) {
4666       QualType t = I;
4667       // Make sure we convert "t (^)(...)" to "t (*)(...)".
4668       if (convertObjCTypeToCStyleType(t))
4669         modified = true;
4670       ArgTypes.push_back(t);
4671     }
4672   }
4673   QualType FuncType;
4674   if (modified)
4675     FuncType = getSimpleFunctionType(Res, ArgTypes);
4676   else FuncType = QualType(FT, 0);
4677   return FuncType;
4678 }
4679 
4680 Stmt *RewriteModernObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
4681   // Navigate to relevant type information.
4682   const BlockPointerType *CPT = nullptr;
4683 
4684   if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
4685     CPT = DRE->getType()->getAs<BlockPointerType>();
4686   } else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
4687     CPT = MExpr->getType()->getAs<BlockPointerType>();
4688   }
4689   else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
4690     return SynthesizeBlockCall(Exp, PRE->getSubExpr());
4691   }
4692   else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
4693     CPT = IEXPR->getType()->getAs<BlockPointerType>();
4694   else if (const ConditionalOperator *CEXPR =
4695             dyn_cast<ConditionalOperator>(BlockExp)) {
4696     Expr *LHSExp = CEXPR->getLHS();
4697     Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
4698     Expr *RHSExp = CEXPR->getRHS();
4699     Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
4700     Expr *CONDExp = CEXPR->getCond();
4701     ConditionalOperator *CondExpr =
4702       new (Context) ConditionalOperator(CONDExp,
4703                                       SourceLocation(), cast<Expr>(LHSStmt),
4704                                       SourceLocation(), cast<Expr>(RHSStmt),
4705                                       Exp->getType(), VK_RValue, OK_Ordinary);
4706     return CondExpr;
4707   } else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
4708     CPT = IRE->getType()->getAs<BlockPointerType>();
4709   } else if (const PseudoObjectExpr *POE
4710                = dyn_cast<PseudoObjectExpr>(BlockExp)) {
4711     CPT = POE->getType()->castAs<BlockPointerType>();
4712   } else {
4713     assert(1 && "RewriteBlockClass: Bad type");
4714   }
4715   assert(CPT && "RewriteBlockClass: Bad type");
4716   const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
4717   assert(FT && "RewriteBlockClass: Bad type");
4718   const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4719   // FTP will be null for closures that don't take arguments.
4720 
4721   RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
4722                                       SourceLocation(), SourceLocation(),
4723                                       &Context->Idents.get("__block_impl"));
4724   QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
4725 
4726   // Generate a funky cast.
4727   SmallVector<QualType, 8> ArgTypes;
4728 
4729   // Push the block argument type.
4730   ArgTypes.push_back(PtrBlock);
4731   if (FTP) {
4732     for (auto &I : FTP->param_types()) {
4733       QualType t = I;
4734       // Make sure we convert "t (^)(...)" to "t (*)(...)".
4735       if (!convertBlockPointerToFunctionPointer(t))
4736         convertToUnqualifiedObjCType(t);
4737       ArgTypes.push_back(t);
4738     }
4739   }
4740   // Now do the pointer to function cast.
4741   QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
4742 
4743   PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
4744 
4745   CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
4746                                                CK_BitCast,
4747                                                const_cast<Expr*>(BlockExp));
4748   // Don't forget the parens to enforce the proper binding.
4749   ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4750                                           BlkCast);
4751   //PE->dump();
4752 
4753   FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
4754                                     SourceLocation(),
4755                                     &Context->Idents.get("FuncPtr"),
4756                                     Context->VoidPtrTy, nullptr,
4757                                     /*BitWidth=*/nullptr, /*Mutable=*/true,
4758                                     ICIS_NoInit);
4759   MemberExpr *ME = new (Context) MemberExpr(PE, true, FD, SourceLocation(),
4760                                             FD->getType(), VK_LValue,
4761                                             OK_Ordinary);
4762 
4763 
4764   CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
4765                                                 CK_BitCast, ME);
4766   PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
4767 
4768   SmallVector<Expr*, 8> BlkExprs;
4769   // Add the implicit argument.
4770   BlkExprs.push_back(BlkCast);
4771   // Add the user arguments.
4772   for (CallExpr::arg_iterator I = Exp->arg_begin(),
4773        E = Exp->arg_end(); I != E; ++I) {
4774     BlkExprs.push_back(*I);
4775   }
4776   CallExpr *CE = new (Context) CallExpr(*Context, PE, BlkExprs,
4777                                         Exp->getType(), VK_RValue,
4778                                         SourceLocation());
4779   return CE;
4780 }
4781 
4782 // We need to return the rewritten expression to handle cases where the
4783 // DeclRefExpr is embedded in another expression being rewritten.
4784 // For example:
4785 //
4786 // int main() {
4787 //    __block Foo *f;
4788 //    __block int i;
4789 //
4790 //    void (^myblock)() = ^() {
4791 //        [f test]; // f is a DeclRefExpr embedded in a message (which is being rewritten).
4792 //        i = 77;
4793 //    };
4794 //}
4795 Stmt *RewriteModernObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
4796   // Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
4797   // for each DeclRefExp where BYREFVAR is name of the variable.
4798   ValueDecl *VD = DeclRefExp->getDecl();
4799   bool isArrow = DeclRefExp->refersToEnclosingLocal();
4800 
4801   FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
4802                                     SourceLocation(),
4803                                     &Context->Idents.get("__forwarding"),
4804                                     Context->VoidPtrTy, nullptr,
4805                                     /*BitWidth=*/nullptr, /*Mutable=*/true,
4806                                     ICIS_NoInit);
4807   MemberExpr *ME = new (Context) MemberExpr(DeclRefExp, isArrow,
4808                                             FD, SourceLocation(),
4809                                             FD->getType(), VK_LValue,
4810                                             OK_Ordinary);
4811 
4812   StringRef Name = VD->getName();
4813   FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
4814                          &Context->Idents.get(Name),
4815                          Context->VoidPtrTy, nullptr,
4816                          /*BitWidth=*/nullptr, /*Mutable=*/true,
4817                          ICIS_NoInit);
4818   ME = new (Context) MemberExpr(ME, true, FD, SourceLocation(),
4819                                 DeclRefExp->getType(), VK_LValue, OK_Ordinary);
4820 
4821 
4822 
4823   // Need parens to enforce precedence.
4824   ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
4825                                           DeclRefExp->getExprLoc(),
4826                                           ME);
4827   ReplaceStmt(DeclRefExp, PE);
4828   return PE;
4829 }
4830 
4831 // Rewrites the imported local variable V with external storage
4832 // (static, extern, etc.) as *V
4833 //
4834 Stmt *RewriteModernObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
4835   ValueDecl *VD = DRE->getDecl();
4836   if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4837     if (!ImportedLocalExternalDecls.count(Var))
4838       return DRE;
4839   Expr *Exp = new (Context) UnaryOperator(DRE, UO_Deref, DRE->getType(),
4840                                           VK_LValue, OK_Ordinary,
4841                                           DRE->getLocation());
4842   // Need parens to enforce precedence.
4843   ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4844                                           Exp);
4845   ReplaceStmt(DRE, PE);
4846   return PE;
4847 }
4848 
4849 void RewriteModernObjC::RewriteCastExpr(CStyleCastExpr *CE) {
4850   SourceLocation LocStart = CE->getLParenLoc();
4851   SourceLocation LocEnd = CE->getRParenLoc();
4852 
4853   // Need to avoid trying to rewrite synthesized casts.
4854   if (LocStart.isInvalid())
4855     return;
4856   // Need to avoid trying to rewrite casts contained in macros.
4857   if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
4858     return;
4859 
4860   const char *startBuf = SM->getCharacterData(LocStart);
4861   const char *endBuf = SM->getCharacterData(LocEnd);
4862   QualType QT = CE->getType();
4863   const Type* TypePtr = QT->getAs<Type>();
4864   if (isa<TypeOfExprType>(TypePtr)) {
4865     const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
4866     QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
4867     std::string TypeAsString = "(";
4868     RewriteBlockPointerType(TypeAsString, QT);
4869     TypeAsString += ")";
4870     ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
4871     return;
4872   }
4873   // advance the location to startArgList.
4874   const char *argPtr = startBuf;
4875 
4876   while (*argPtr++ && (argPtr < endBuf)) {
4877     switch (*argPtr) {
4878     case '^':
4879       // Replace the '^' with '*'.
4880       LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
4881       ReplaceText(LocStart, 1, "*");
4882       break;
4883     }
4884   }
4885   return;
4886 }
4887 
4888 void RewriteModernObjC::RewriteImplicitCastObjCExpr(CastExpr *IC) {
4889   CastKind CastKind = IC->getCastKind();
4890   if (CastKind != CK_BlockPointerToObjCPointerCast &&
4891       CastKind != CK_AnyPointerToBlockPointerCast)
4892     return;
4893 
4894   QualType QT = IC->getType();
4895   (void)convertBlockPointerToFunctionPointer(QT);
4896   std::string TypeString(QT.getAsString(Context->getPrintingPolicy()));
4897   std::string Str = "(";
4898   Str += TypeString;
4899   Str += ")";
4900   InsertText(IC->getSubExpr()->getLocStart(), &Str[0], Str.size());
4901 
4902   return;
4903 }
4904 
4905 void RewriteModernObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
4906   SourceLocation DeclLoc = FD->getLocation();
4907   unsigned parenCount = 0;
4908 
4909   // We have 1 or more arguments that have closure pointers.
4910   const char *startBuf = SM->getCharacterData(DeclLoc);
4911   const char *startArgList = strchr(startBuf, '(');
4912 
4913   assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
4914 
4915   parenCount++;
4916   // advance the location to startArgList.
4917   DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
4918   assert((DeclLoc.isValid()) && "Invalid DeclLoc");
4919 
4920   const char *argPtr = startArgList;
4921 
4922   while (*argPtr++ && parenCount) {
4923     switch (*argPtr) {
4924     case '^':
4925       // Replace the '^' with '*'.
4926       DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
4927       ReplaceText(DeclLoc, 1, "*");
4928       break;
4929     case '(':
4930       parenCount++;
4931       break;
4932     case ')':
4933       parenCount--;
4934       break;
4935     }
4936   }
4937   return;
4938 }
4939 
4940 bool RewriteModernObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
4941   const FunctionProtoType *FTP;
4942   const PointerType *PT = QT->getAs<PointerType>();
4943   if (PT) {
4944     FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4945   } else {
4946     const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4947     assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4948     FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4949   }
4950   if (FTP) {
4951     for (const auto &I : FTP->param_types())
4952       if (isTopLevelBlockPointerType(I))
4953         return true;
4954   }
4955   return false;
4956 }
4957 
4958 bool RewriteModernObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
4959   const FunctionProtoType *FTP;
4960   const PointerType *PT = QT->getAs<PointerType>();
4961   if (PT) {
4962     FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4963   } else {
4964     const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4965     assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4966     FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4967   }
4968   if (FTP) {
4969     for (const auto &I : FTP->param_types()) {
4970       if (I->isObjCQualifiedIdType())
4971         return true;
4972       if (I->isObjCObjectPointerType() &&
4973           I->getPointeeType()->isObjCQualifiedInterfaceType())
4974         return true;
4975     }
4976 
4977   }
4978   return false;
4979 }
4980 
4981 void RewriteModernObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
4982                                      const char *&RParen) {
4983   const char *argPtr = strchr(Name, '(');
4984   assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
4985 
4986   LParen = argPtr; // output the start.
4987   argPtr++; // skip past the left paren.
4988   unsigned parenCount = 1;
4989 
4990   while (*argPtr && parenCount) {
4991     switch (*argPtr) {
4992     case '(': parenCount++; break;
4993     case ')': parenCount--; break;
4994     default: break;
4995     }
4996     if (parenCount) argPtr++;
4997   }
4998   assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
4999   RParen = argPtr; // output the end
5000 }
5001 
5002 void RewriteModernObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
5003   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
5004     RewriteBlockPointerFunctionArgs(FD);
5005     return;
5006   }
5007   // Handle Variables and Typedefs.
5008   SourceLocation DeclLoc = ND->getLocation();
5009   QualType DeclT;
5010   if (VarDecl *VD = dyn_cast<VarDecl>(ND))
5011     DeclT = VD->getType();
5012   else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
5013     DeclT = TDD->getUnderlyingType();
5014   else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
5015     DeclT = FD->getType();
5016   else
5017     llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
5018 
5019   const char *startBuf = SM->getCharacterData(DeclLoc);
5020   const char *endBuf = startBuf;
5021   // scan backward (from the decl location) for the end of the previous decl.
5022   while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
5023     startBuf--;
5024   SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
5025   std::string buf;
5026   unsigned OrigLength=0;
5027   // *startBuf != '^' if we are dealing with a pointer to function that
5028   // may take block argument types (which will be handled below).
5029   if (*startBuf == '^') {
5030     // Replace the '^' with '*', computing a negative offset.
5031     buf = '*';
5032     startBuf++;
5033     OrigLength++;
5034   }
5035   while (*startBuf != ')') {
5036     buf += *startBuf;
5037     startBuf++;
5038     OrigLength++;
5039   }
5040   buf += ')';
5041   OrigLength++;
5042 
5043   if (PointerTypeTakesAnyBlockArguments(DeclT) ||
5044       PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
5045     // Replace the '^' with '*' for arguments.
5046     // Replace id<P> with id/*<>*/
5047     DeclLoc = ND->getLocation();
5048     startBuf = SM->getCharacterData(DeclLoc);
5049     const char *argListBegin, *argListEnd;
5050     GetExtentOfArgList(startBuf, argListBegin, argListEnd);
5051     while (argListBegin < argListEnd) {
5052       if (*argListBegin == '^')
5053         buf += '*';
5054       else if (*argListBegin ==  '<') {
5055         buf += "/*";
5056         buf += *argListBegin++;
5057         OrigLength++;
5058         while (*argListBegin != '>') {
5059           buf += *argListBegin++;
5060           OrigLength++;
5061         }
5062         buf += *argListBegin;
5063         buf += "*/";
5064       }
5065       else
5066         buf += *argListBegin;
5067       argListBegin++;
5068       OrigLength++;
5069     }
5070     buf += ')';
5071     OrigLength++;
5072   }
5073   ReplaceText(Start, OrigLength, buf);
5074 
5075   return;
5076 }
5077 
5078 
5079 /// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
5080 /// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
5081 ///                    struct Block_byref_id_object *src) {
5082 ///  _Block_object_assign (&_dest->object, _src->object,
5083 ///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
5084 ///                        [|BLOCK_FIELD_IS_WEAK]) // object
5085 ///  _Block_object_assign(&_dest->object, _src->object,
5086 ///                       BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
5087 ///                       [|BLOCK_FIELD_IS_WEAK]) // block
5088 /// }
5089 /// And:
5090 /// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
5091 ///  _Block_object_dispose(_src->object,
5092 ///                        BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
5093 ///                        [|BLOCK_FIELD_IS_WEAK]) // object
5094 ///  _Block_object_dispose(_src->object,
5095 ///                         BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
5096 ///                         [|BLOCK_FIELD_IS_WEAK]) // block
5097 /// }
5098 
5099 std::string RewriteModernObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
5100                                                           int flag) {
5101   std::string S;
5102   if (CopyDestroyCache.count(flag))
5103     return S;
5104   CopyDestroyCache.insert(flag);
5105   S = "static void __Block_byref_id_object_copy_";
5106   S += utostr(flag);
5107   S += "(void *dst, void *src) {\n";
5108 
5109   // offset into the object pointer is computed as:
5110   // void * + void* + int + int + void* + void *
5111   unsigned IntSize =
5112   static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
5113   unsigned VoidPtrSize =
5114   static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
5115 
5116   unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
5117   S += " _Block_object_assign((char*)dst + ";
5118   S += utostr(offset);
5119   S += ", *(void * *) ((char*)src + ";
5120   S += utostr(offset);
5121   S += "), ";
5122   S += utostr(flag);
5123   S += ");\n}\n";
5124 
5125   S += "static void __Block_byref_id_object_dispose_";
5126   S += utostr(flag);
5127   S += "(void *src) {\n";
5128   S += " _Block_object_dispose(*(void * *) ((char*)src + ";
5129   S += utostr(offset);
5130   S += "), ";
5131   S += utostr(flag);
5132   S += ");\n}\n";
5133   return S;
5134 }
5135 
5136 /// RewriteByRefVar - For each __block typex ND variable this routine transforms
5137 /// the declaration into:
5138 /// struct __Block_byref_ND {
5139 /// void *__isa;                  // NULL for everything except __weak pointers
5140 /// struct __Block_byref_ND *__forwarding;
5141 /// int32_t __flags;
5142 /// int32_t __size;
5143 /// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
5144 /// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
5145 /// typex ND;
5146 /// };
5147 ///
5148 /// It then replaces declaration of ND variable with:
5149 /// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
5150 ///                               __size=sizeof(struct __Block_byref_ND),
5151 ///                               ND=initializer-if-any};
5152 ///
5153 ///
5154 void RewriteModernObjC::RewriteByRefVar(VarDecl *ND, bool firstDecl,
5155                                         bool lastDecl) {
5156   int flag = 0;
5157   int isa = 0;
5158   SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
5159   if (DeclLoc.isInvalid())
5160     // If type location is missing, it is because of missing type (a warning).
5161     // Use variable's location which is good for this case.
5162     DeclLoc = ND->getLocation();
5163   const char *startBuf = SM->getCharacterData(DeclLoc);
5164   SourceLocation X = ND->getLocEnd();
5165   X = SM->getExpansionLoc(X);
5166   const char *endBuf = SM->getCharacterData(X);
5167   std::string Name(ND->getNameAsString());
5168   std::string ByrefType;
5169   RewriteByRefString(ByrefType, Name, ND, true);
5170   ByrefType += " {\n";
5171   ByrefType += "  void *__isa;\n";
5172   RewriteByRefString(ByrefType, Name, ND);
5173   ByrefType += " *__forwarding;\n";
5174   ByrefType += " int __flags;\n";
5175   ByrefType += " int __size;\n";
5176   // Add void *__Block_byref_id_object_copy;
5177   // void *__Block_byref_id_object_dispose; if needed.
5178   QualType Ty = ND->getType();
5179   bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
5180   if (HasCopyAndDispose) {
5181     ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
5182     ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
5183   }
5184 
5185   QualType T = Ty;
5186   (void)convertBlockPointerToFunctionPointer(T);
5187   T.getAsStringInternal(Name, Context->getPrintingPolicy());
5188 
5189   ByrefType += " " + Name + ";\n";
5190   ByrefType += "};\n";
5191   // Insert this type in global scope. It is needed by helper function.
5192   SourceLocation FunLocStart;
5193   if (CurFunctionDef)
5194      FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
5195   else {
5196     assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
5197     FunLocStart = CurMethodDef->getLocStart();
5198   }
5199   InsertText(FunLocStart, ByrefType);
5200 
5201   if (Ty.isObjCGCWeak()) {
5202     flag |= BLOCK_FIELD_IS_WEAK;
5203     isa = 1;
5204   }
5205   if (HasCopyAndDispose) {
5206     flag = BLOCK_BYREF_CALLER;
5207     QualType Ty = ND->getType();
5208     // FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
5209     if (Ty->isBlockPointerType())
5210       flag |= BLOCK_FIELD_IS_BLOCK;
5211     else
5212       flag |= BLOCK_FIELD_IS_OBJECT;
5213     std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
5214     if (!HF.empty())
5215       Preamble += HF;
5216   }
5217 
5218   // struct __Block_byref_ND ND =
5219   // {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
5220   //  initializer-if-any};
5221   bool hasInit = (ND->getInit() != nullptr);
5222   // FIXME. rewriter does not support __block c++ objects which
5223   // require construction.
5224   if (hasInit)
5225     if (CXXConstructExpr *CExp = dyn_cast<CXXConstructExpr>(ND->getInit())) {
5226       CXXConstructorDecl *CXXDecl = CExp->getConstructor();
5227       if (CXXDecl && CXXDecl->isDefaultConstructor())
5228         hasInit = false;
5229     }
5230 
5231   unsigned flags = 0;
5232   if (HasCopyAndDispose)
5233     flags |= BLOCK_HAS_COPY_DISPOSE;
5234   Name = ND->getNameAsString();
5235   ByrefType.clear();
5236   RewriteByRefString(ByrefType, Name, ND);
5237   std::string ForwardingCastType("(");
5238   ForwardingCastType += ByrefType + " *)";
5239   ByrefType += " " + Name + " = {(void*)";
5240   ByrefType += utostr(isa);
5241   ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
5242   ByrefType += utostr(flags);
5243   ByrefType += ", ";
5244   ByrefType += "sizeof(";
5245   RewriteByRefString(ByrefType, Name, ND);
5246   ByrefType += ")";
5247   if (HasCopyAndDispose) {
5248     ByrefType += ", __Block_byref_id_object_copy_";
5249     ByrefType += utostr(flag);
5250     ByrefType += ", __Block_byref_id_object_dispose_";
5251     ByrefType += utostr(flag);
5252   }
5253 
5254   if (!firstDecl) {
5255     // In multiple __block declarations, and for all but 1st declaration,
5256     // find location of the separating comma. This would be start location
5257     // where new text is to be inserted.
5258     DeclLoc = ND->getLocation();
5259     const char *startDeclBuf = SM->getCharacterData(DeclLoc);
5260     const char *commaBuf = startDeclBuf;
5261     while (*commaBuf != ',')
5262       commaBuf--;
5263     assert((*commaBuf == ',') && "RewriteByRefVar: can't find ','");
5264     DeclLoc = DeclLoc.getLocWithOffset(commaBuf - startDeclBuf);
5265     startBuf = commaBuf;
5266   }
5267 
5268   if (!hasInit) {
5269     ByrefType += "};\n";
5270     unsigned nameSize = Name.size();
5271     // for block or function pointer declaration. Name is aleady
5272     // part of the declaration.
5273     if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
5274       nameSize = 1;
5275     ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
5276   }
5277   else {
5278     ByrefType += ", ";
5279     SourceLocation startLoc;
5280     Expr *E = ND->getInit();
5281     if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
5282       startLoc = ECE->getLParenLoc();
5283     else
5284       startLoc = E->getLocStart();
5285     startLoc = SM->getExpansionLoc(startLoc);
5286     endBuf = SM->getCharacterData(startLoc);
5287     ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
5288 
5289     const char separator = lastDecl ? ';' : ',';
5290     const char *startInitializerBuf = SM->getCharacterData(startLoc);
5291     const char *separatorBuf = strchr(startInitializerBuf, separator);
5292     assert((*separatorBuf == separator) &&
5293            "RewriteByRefVar: can't find ';' or ','");
5294     SourceLocation separatorLoc =
5295       startLoc.getLocWithOffset(separatorBuf-startInitializerBuf);
5296 
5297     InsertText(separatorLoc, lastDecl ? "}" : "};\n");
5298   }
5299   return;
5300 }
5301 
5302 void RewriteModernObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
5303   // Add initializers for any closure decl refs.
5304   GetBlockDeclRefExprs(Exp->getBody());
5305   if (BlockDeclRefs.size()) {
5306     // Unique all "by copy" declarations.
5307     for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5308       if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5309         if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5310           BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5311           BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
5312         }
5313       }
5314     // Unique all "by ref" declarations.
5315     for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5316       if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5317         if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5318           BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5319           BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
5320         }
5321       }
5322     // Find any imported blocks...they will need special attention.
5323     for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5324       if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5325           BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5326           BlockDeclRefs[i]->getType()->isBlockPointerType())
5327         ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
5328   }
5329 }
5330 
5331 FunctionDecl *RewriteModernObjC::SynthBlockInitFunctionDecl(StringRef name) {
5332   IdentifierInfo *ID = &Context->Idents.get(name);
5333   QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
5334   return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
5335                               SourceLocation(), ID, FType, nullptr, SC_Extern,
5336                               false, false);
5337 }
5338 
5339 Stmt *RewriteModernObjC::SynthBlockInitExpr(BlockExpr *Exp,
5340                      const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
5341 
5342   const BlockDecl *block = Exp->getBlockDecl();
5343 
5344   Blocks.push_back(Exp);
5345 
5346   CollectBlockDeclRefInfo(Exp);
5347 
5348   // Add inner imported variables now used in current block.
5349  int countOfInnerDecls = 0;
5350   if (!InnerBlockDeclRefs.empty()) {
5351     for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
5352       DeclRefExpr *Exp = InnerBlockDeclRefs[i];
5353       ValueDecl *VD = Exp->getDecl();
5354       if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
5355       // We need to save the copied-in variables in nested
5356       // blocks because it is needed at the end for some of the API generations.
5357       // See SynthesizeBlockLiterals routine.
5358         InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5359         BlockDeclRefs.push_back(Exp);
5360         BlockByCopyDeclsPtrSet.insert(VD);
5361         BlockByCopyDecls.push_back(VD);
5362       }
5363       if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
5364         InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5365         BlockDeclRefs.push_back(Exp);
5366         BlockByRefDeclsPtrSet.insert(VD);
5367         BlockByRefDecls.push_back(VD);
5368       }
5369     }
5370     // Find any imported blocks...they will need special attention.
5371     for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
5372       if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5373           InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5374           InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
5375         ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
5376   }
5377   InnerDeclRefsCount.push_back(countOfInnerDecls);
5378 
5379   std::string FuncName;
5380 
5381   if (CurFunctionDef)
5382     FuncName = CurFunctionDef->getNameAsString();
5383   else if (CurMethodDef)
5384     BuildUniqueMethodName(FuncName, CurMethodDef);
5385   else if (GlobalVarDecl)
5386     FuncName = std::string(GlobalVarDecl->getNameAsString());
5387 
5388   bool GlobalBlockExpr =
5389     block->getDeclContext()->getRedeclContext()->isFileContext();
5390 
5391   if (GlobalBlockExpr && !GlobalVarDecl) {
5392     Diags.Report(block->getLocation(), GlobalBlockRewriteFailedDiag);
5393     GlobalBlockExpr = false;
5394   }
5395 
5396   std::string BlockNumber = utostr(Blocks.size()-1);
5397 
5398   std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
5399 
5400   // Get a pointer to the function type so we can cast appropriately.
5401   QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
5402   QualType FType = Context->getPointerType(BFT);
5403 
5404   FunctionDecl *FD;
5405   Expr *NewRep;
5406 
5407   // Simulate a constructor call...
5408   std::string Tag;
5409 
5410   if (GlobalBlockExpr)
5411     Tag = "__global_";
5412   else
5413     Tag = "__";
5414   Tag += FuncName + "_block_impl_" + BlockNumber;
5415 
5416   FD = SynthBlockInitFunctionDecl(Tag);
5417   DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, false, FType, VK_RValue,
5418                                                SourceLocation());
5419 
5420   SmallVector<Expr*, 4> InitExprs;
5421 
5422   // Initialize the block function.
5423   FD = SynthBlockInitFunctionDecl(Func);
5424   DeclRefExpr *Arg = new (Context) DeclRefExpr(FD, false, FD->getType(),
5425                                                VK_LValue, SourceLocation());
5426   CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5427                                                 CK_BitCast, Arg);
5428   InitExprs.push_back(castExpr);
5429 
5430   // Initialize the block descriptor.
5431   std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
5432 
5433   VarDecl *NewVD = VarDecl::Create(*Context, TUDecl,
5434                                    SourceLocation(), SourceLocation(),
5435                                    &Context->Idents.get(DescData.c_str()),
5436                                    Context->VoidPtrTy, nullptr,
5437                                    SC_Static);
5438   UnaryOperator *DescRefExpr =
5439     new (Context) UnaryOperator(new (Context) DeclRefExpr(NewVD, false,
5440                                                           Context->VoidPtrTy,
5441                                                           VK_LValue,
5442                                                           SourceLocation()),
5443                                 UO_AddrOf,
5444                                 Context->getPointerType(Context->VoidPtrTy),
5445                                 VK_RValue, OK_Ordinary,
5446                                 SourceLocation());
5447   InitExprs.push_back(DescRefExpr);
5448 
5449   // Add initializers for any closure decl refs.
5450   if (BlockDeclRefs.size()) {
5451     Expr *Exp;
5452     // Output all "by copy" declarations.
5453     for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
5454          E = BlockByCopyDecls.end(); I != E; ++I) {
5455       if (isObjCType((*I)->getType())) {
5456         // FIXME: Conform to ABI ([[obj retain] autorelease]).
5457         FD = SynthBlockInitFunctionDecl((*I)->getName());
5458         Exp = new (Context) DeclRefExpr(FD, false, FD->getType(),
5459                                         VK_LValue, SourceLocation());
5460         if (HasLocalVariableExternalStorage(*I)) {
5461           QualType QT = (*I)->getType();
5462           QT = Context->getPointerType(QT);
5463           Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
5464                                             OK_Ordinary, SourceLocation());
5465         }
5466       } else if (isTopLevelBlockPointerType((*I)->getType())) {
5467         FD = SynthBlockInitFunctionDecl((*I)->getName());
5468         Arg = new (Context) DeclRefExpr(FD, false, FD->getType(),
5469                                         VK_LValue, SourceLocation());
5470         Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5471                                        CK_BitCast, Arg);
5472       } else {
5473         FD = SynthBlockInitFunctionDecl((*I)->getName());
5474         Exp = new (Context) DeclRefExpr(FD, false, FD->getType(),
5475                                         VK_LValue, SourceLocation());
5476         if (HasLocalVariableExternalStorage(*I)) {
5477           QualType QT = (*I)->getType();
5478           QT = Context->getPointerType(QT);
5479           Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
5480                                             OK_Ordinary, SourceLocation());
5481         }
5482 
5483       }
5484       InitExprs.push_back(Exp);
5485     }
5486     // Output all "by ref" declarations.
5487     for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
5488          E = BlockByRefDecls.end(); I != E; ++I) {
5489       ValueDecl *ND = (*I);
5490       std::string Name(ND->getNameAsString());
5491       std::string RecName;
5492       RewriteByRefString(RecName, Name, ND, true);
5493       IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
5494                                                 + sizeof("struct"));
5495       RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
5496                                           SourceLocation(), SourceLocation(),
5497                                           II);
5498       assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
5499       QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
5500 
5501       FD = SynthBlockInitFunctionDecl((*I)->getName());
5502       Exp = new (Context) DeclRefExpr(FD, false, FD->getType(), VK_LValue,
5503                                       SourceLocation());
5504       bool isNestedCapturedVar = false;
5505       if (block)
5506         for (const auto &CI : block->captures()) {
5507           const VarDecl *variable = CI.getVariable();
5508           if (variable == ND && CI.isNested()) {
5509             assert (CI.isByRef() &&
5510                     "SynthBlockInitExpr - captured block variable is not byref");
5511             isNestedCapturedVar = true;
5512             break;
5513           }
5514         }
5515       // captured nested byref variable has its address passed. Do not take
5516       // its address again.
5517       if (!isNestedCapturedVar)
5518           Exp = new (Context) UnaryOperator(Exp, UO_AddrOf,
5519                                      Context->getPointerType(Exp->getType()),
5520                                      VK_RValue, OK_Ordinary, SourceLocation());
5521       Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
5522       InitExprs.push_back(Exp);
5523     }
5524   }
5525   if (ImportedBlockDecls.size()) {
5526     // generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
5527     int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
5528     unsigned IntSize =
5529       static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
5530     Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
5531                                            Context->IntTy, SourceLocation());
5532     InitExprs.push_back(FlagExp);
5533   }
5534   NewRep = new (Context) CallExpr(*Context, DRE, InitExprs,
5535                                   FType, VK_LValue, SourceLocation());
5536 
5537   if (GlobalBlockExpr) {
5538     assert (!GlobalConstructionExp &&
5539             "SynthBlockInitExpr - GlobalConstructionExp must be null");
5540     GlobalConstructionExp = NewRep;
5541     NewRep = DRE;
5542   }
5543 
5544   NewRep = new (Context) UnaryOperator(NewRep, UO_AddrOf,
5545                              Context->getPointerType(NewRep->getType()),
5546                              VK_RValue, OK_Ordinary, SourceLocation());
5547   NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
5548                                     NewRep);
5549   BlockDeclRefs.clear();
5550   BlockByRefDecls.clear();
5551   BlockByRefDeclsPtrSet.clear();
5552   BlockByCopyDecls.clear();
5553   BlockByCopyDeclsPtrSet.clear();
5554   ImportedBlockDecls.clear();
5555   return NewRep;
5556 }
5557 
5558 bool RewriteModernObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
5559   if (const ObjCForCollectionStmt * CS =
5560       dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
5561         return CS->getElement() == DS;
5562   return false;
5563 }
5564 
5565 //===----------------------------------------------------------------------===//
5566 // Function Body / Expression rewriting
5567 //===----------------------------------------------------------------------===//
5568 
5569 Stmt *RewriteModernObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
5570   if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
5571       isa<DoStmt>(S) || isa<ForStmt>(S))
5572     Stmts.push_back(S);
5573   else if (isa<ObjCForCollectionStmt>(S)) {
5574     Stmts.push_back(S);
5575     ObjCBcLabelNo.push_back(++BcLabelCount);
5576   }
5577 
5578   // Pseudo-object operations and ivar references need special
5579   // treatment because we're going to recursively rewrite them.
5580   if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
5581     if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
5582       return RewritePropertyOrImplicitSetter(PseudoOp);
5583     } else {
5584       return RewritePropertyOrImplicitGetter(PseudoOp);
5585     }
5586   } else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
5587     return RewriteObjCIvarRefExpr(IvarRefExpr);
5588   }
5589   else if (isa<OpaqueValueExpr>(S))
5590     S = cast<OpaqueValueExpr>(S)->getSourceExpr();
5591 
5592   SourceRange OrigStmtRange = S->getSourceRange();
5593 
5594   // Perform a bottom up rewrite of all children.
5595   for (Stmt::child_range CI = S->children(); CI; ++CI)
5596     if (*CI) {
5597       Stmt *childStmt = (*CI);
5598       Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
5599       if (newStmt) {
5600         *CI = newStmt;
5601       }
5602     }
5603 
5604   if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
5605     SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
5606     llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
5607     InnerContexts.insert(BE->getBlockDecl());
5608     ImportedLocalExternalDecls.clear();
5609     GetInnerBlockDeclRefExprs(BE->getBody(),
5610                               InnerBlockDeclRefs, InnerContexts);
5611     // Rewrite the block body in place.
5612     Stmt *SaveCurrentBody = CurrentBody;
5613     CurrentBody = BE->getBody();
5614     PropParentMap = nullptr;
5615     // block literal on rhs of a property-dot-sytax assignment
5616     // must be replaced by its synthesize ast so getRewrittenText
5617     // works as expected. In this case, what actually ends up on RHS
5618     // is the blockTranscribed which is the helper function for the
5619     // block literal; as in: self.c = ^() {[ace ARR];};
5620     bool saveDisableReplaceStmt = DisableReplaceStmt;
5621     DisableReplaceStmt = false;
5622     RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
5623     DisableReplaceStmt = saveDisableReplaceStmt;
5624     CurrentBody = SaveCurrentBody;
5625     PropParentMap = nullptr;
5626     ImportedLocalExternalDecls.clear();
5627     // Now we snarf the rewritten text and stash it away for later use.
5628     std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
5629     RewrittenBlockExprs[BE] = Str;
5630 
5631     Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
5632 
5633     //blockTranscribed->dump();
5634     ReplaceStmt(S, blockTranscribed);
5635     return blockTranscribed;
5636   }
5637   // Handle specific things.
5638   if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
5639     return RewriteAtEncode(AtEncode);
5640 
5641   if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
5642     return RewriteAtSelector(AtSelector);
5643 
5644   if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
5645     return RewriteObjCStringLiteral(AtString);
5646 
5647   if (ObjCBoolLiteralExpr *BoolLitExpr = dyn_cast<ObjCBoolLiteralExpr>(S))
5648     return RewriteObjCBoolLiteralExpr(BoolLitExpr);
5649 
5650   if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(S))
5651     return RewriteObjCBoxedExpr(BoxedExpr);
5652 
5653   if (ObjCArrayLiteral *ArrayLitExpr = dyn_cast<ObjCArrayLiteral>(S))
5654     return RewriteObjCArrayLiteralExpr(ArrayLitExpr);
5655 
5656   if (ObjCDictionaryLiteral *DictionaryLitExpr =
5657         dyn_cast<ObjCDictionaryLiteral>(S))
5658     return RewriteObjCDictionaryLiteralExpr(DictionaryLitExpr);
5659 
5660   if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
5661 #if 0
5662     // Before we rewrite it, put the original message expression in a comment.
5663     SourceLocation startLoc = MessExpr->getLocStart();
5664     SourceLocation endLoc = MessExpr->getLocEnd();
5665 
5666     const char *startBuf = SM->getCharacterData(startLoc);
5667     const char *endBuf = SM->getCharacterData(endLoc);
5668 
5669     std::string messString;
5670     messString += "// ";
5671     messString.append(startBuf, endBuf-startBuf+1);
5672     messString += "\n";
5673 
5674     // FIXME: Missing definition of
5675     // InsertText(clang::SourceLocation, char const*, unsigned int).
5676     // InsertText(startLoc, messString.c_str(), messString.size());
5677     // Tried this, but it didn't work either...
5678     // ReplaceText(startLoc, 0, messString.c_str(), messString.size());
5679 #endif
5680     return RewriteMessageExpr(MessExpr);
5681   }
5682 
5683   if (ObjCAutoreleasePoolStmt *StmtAutoRelease =
5684         dyn_cast<ObjCAutoreleasePoolStmt>(S)) {
5685     return RewriteObjCAutoreleasePoolStmt(StmtAutoRelease);
5686   }
5687 
5688   if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
5689     return RewriteObjCTryStmt(StmtTry);
5690 
5691   if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
5692     return RewriteObjCSynchronizedStmt(StmtTry);
5693 
5694   if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
5695     return RewriteObjCThrowStmt(StmtThrow);
5696 
5697   if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
5698     return RewriteObjCProtocolExpr(ProtocolExp);
5699 
5700   if (ObjCForCollectionStmt *StmtForCollection =
5701         dyn_cast<ObjCForCollectionStmt>(S))
5702     return RewriteObjCForCollectionStmt(StmtForCollection,
5703                                         OrigStmtRange.getEnd());
5704   if (BreakStmt *StmtBreakStmt =
5705       dyn_cast<BreakStmt>(S))
5706     return RewriteBreakStmt(StmtBreakStmt);
5707   if (ContinueStmt *StmtContinueStmt =
5708       dyn_cast<ContinueStmt>(S))
5709     return RewriteContinueStmt(StmtContinueStmt);
5710 
5711   // Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
5712   // and cast exprs.
5713   if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
5714     // FIXME: What we're doing here is modifying the type-specifier that
5715     // precedes the first Decl.  In the future the DeclGroup should have
5716     // a separate type-specifier that we can rewrite.
5717     // NOTE: We need to avoid rewriting the DeclStmt if it is within
5718     // the context of an ObjCForCollectionStmt. For example:
5719     //   NSArray *someArray;
5720     //   for (id <FooProtocol> index in someArray) ;
5721     // This is because RewriteObjCForCollectionStmt() does textual rewriting
5722     // and it depends on the original text locations/positions.
5723     if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
5724       RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
5725 
5726     // Blocks rewrite rules.
5727     for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
5728          DI != DE; ++DI) {
5729       Decl *SD = *DI;
5730       if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
5731         if (isTopLevelBlockPointerType(ND->getType()))
5732           RewriteBlockPointerDecl(ND);
5733         else if (ND->getType()->isFunctionPointerType())
5734           CheckFunctionPointerDecl(ND->getType(), ND);
5735         if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
5736           if (VD->hasAttr<BlocksAttr>()) {
5737             static unsigned uniqueByrefDeclCount = 0;
5738             assert(!BlockByRefDeclNo.count(ND) &&
5739               "RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
5740             BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
5741             RewriteByRefVar(VD, (DI == DS->decl_begin()), ((DI+1) == DE));
5742           }
5743           else
5744             RewriteTypeOfDecl(VD);
5745         }
5746       }
5747       if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
5748         if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5749           RewriteBlockPointerDecl(TD);
5750         else if (TD->getUnderlyingType()->isFunctionPointerType())
5751           CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5752       }
5753     }
5754   }
5755 
5756   if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
5757     RewriteObjCQualifiedInterfaceTypes(CE);
5758 
5759   if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
5760       isa<DoStmt>(S) || isa<ForStmt>(S)) {
5761     assert(!Stmts.empty() && "Statement stack is empty");
5762     assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
5763              isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
5764             && "Statement stack mismatch");
5765     Stmts.pop_back();
5766   }
5767   // Handle blocks rewriting.
5768   if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
5769     ValueDecl *VD = DRE->getDecl();
5770     if (VD->hasAttr<BlocksAttr>())
5771       return RewriteBlockDeclRefExpr(DRE);
5772     if (HasLocalVariableExternalStorage(VD))
5773       return RewriteLocalVariableExternalStorage(DRE);
5774   }
5775 
5776   if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
5777     if (CE->getCallee()->getType()->isBlockPointerType()) {
5778       Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
5779       ReplaceStmt(S, BlockCall);
5780       return BlockCall;
5781     }
5782   }
5783   if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
5784     RewriteCastExpr(CE);
5785   }
5786   if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5787     RewriteImplicitCastObjCExpr(ICE);
5788   }
5789 #if 0
5790 
5791   if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
5792     CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
5793                                                    ICE->getSubExpr(),
5794                                                    SourceLocation());
5795     // Get the new text.
5796     std::string SStr;
5797     llvm::raw_string_ostream Buf(SStr);
5798     Replacement->printPretty(Buf);
5799     const std::string &Str = Buf.str();
5800 
5801     printf("CAST = %s\n", &Str[0]);
5802     InsertText(ICE->getSubExpr()->getLocStart(), &Str[0], Str.size());
5803     delete S;
5804     return Replacement;
5805   }
5806 #endif
5807   // Return this stmt unmodified.
5808   return S;
5809 }
5810 
5811 void RewriteModernObjC::RewriteRecordBody(RecordDecl *RD) {
5812   for (auto *FD : RD->fields()) {
5813     if (isTopLevelBlockPointerType(FD->getType()))
5814       RewriteBlockPointerDecl(FD);
5815     if (FD->getType()->isObjCQualifiedIdType() ||
5816         FD->getType()->isObjCQualifiedInterfaceType())
5817       RewriteObjCQualifiedInterfaceTypes(FD);
5818   }
5819 }
5820 
5821 /// HandleDeclInMainFile - This is called for each top-level decl defined in the
5822 /// main file of the input.
5823 void RewriteModernObjC::HandleDeclInMainFile(Decl *D) {
5824   switch (D->getKind()) {
5825     case Decl::Function: {
5826       FunctionDecl *FD = cast<FunctionDecl>(D);
5827       if (FD->isOverloadedOperator())
5828         return;
5829 
5830       // Since function prototypes don't have ParmDecl's, we check the function
5831       // prototype. This enables us to rewrite function declarations and
5832       // definitions using the same code.
5833       RewriteBlocksInFunctionProtoType(FD->getType(), FD);
5834 
5835       if (!FD->isThisDeclarationADefinition())
5836         break;
5837 
5838       // FIXME: If this should support Obj-C++, support CXXTryStmt
5839       if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
5840         CurFunctionDef = FD;
5841         CurrentBody = Body;
5842         Body =
5843         cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
5844         FD->setBody(Body);
5845         CurrentBody = nullptr;
5846         if (PropParentMap) {
5847           delete PropParentMap;
5848           PropParentMap = nullptr;
5849         }
5850         // This synthesizes and inserts the block "impl" struct, invoke function,
5851         // and any copy/dispose helper functions.
5852         InsertBlockLiteralsWithinFunction(FD);
5853         RewriteLineDirective(D);
5854         CurFunctionDef = nullptr;
5855       }
5856       break;
5857     }
5858     case Decl::ObjCMethod: {
5859       ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
5860       if (CompoundStmt *Body = MD->getCompoundBody()) {
5861         CurMethodDef = MD;
5862         CurrentBody = Body;
5863         Body =
5864           cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
5865         MD->setBody(Body);
5866         CurrentBody = nullptr;
5867         if (PropParentMap) {
5868           delete PropParentMap;
5869           PropParentMap = nullptr;
5870         }
5871         InsertBlockLiteralsWithinMethod(MD);
5872         RewriteLineDirective(D);
5873         CurMethodDef = nullptr;
5874       }
5875       break;
5876     }
5877     case Decl::ObjCImplementation: {
5878       ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(D);
5879       ClassImplementation.push_back(CI);
5880       break;
5881     }
5882     case Decl::ObjCCategoryImpl: {
5883       ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(D);
5884       CategoryImplementation.push_back(CI);
5885       break;
5886     }
5887     case Decl::Var: {
5888       VarDecl *VD = cast<VarDecl>(D);
5889       RewriteObjCQualifiedInterfaceTypes(VD);
5890       if (isTopLevelBlockPointerType(VD->getType()))
5891         RewriteBlockPointerDecl(VD);
5892       else if (VD->getType()->isFunctionPointerType()) {
5893         CheckFunctionPointerDecl(VD->getType(), VD);
5894         if (VD->getInit()) {
5895           if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
5896             RewriteCastExpr(CE);
5897           }
5898         }
5899       } else if (VD->getType()->isRecordType()) {
5900         RecordDecl *RD = VD->getType()->getAs<RecordType>()->getDecl();
5901         if (RD->isCompleteDefinition())
5902           RewriteRecordBody(RD);
5903       }
5904       if (VD->getInit()) {
5905         GlobalVarDecl = VD;
5906         CurrentBody = VD->getInit();
5907         RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
5908         CurrentBody = nullptr;
5909         if (PropParentMap) {
5910           delete PropParentMap;
5911           PropParentMap = nullptr;
5912         }
5913         SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(), VD->getName());
5914         GlobalVarDecl = nullptr;
5915 
5916         // This is needed for blocks.
5917         if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
5918             RewriteCastExpr(CE);
5919         }
5920       }
5921       break;
5922     }
5923     case Decl::TypeAlias:
5924     case Decl::Typedef: {
5925       if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
5926         if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5927           RewriteBlockPointerDecl(TD);
5928         else if (TD->getUnderlyingType()->isFunctionPointerType())
5929           CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5930         else
5931           RewriteObjCQualifiedInterfaceTypes(TD);
5932       }
5933       break;
5934     }
5935     case Decl::CXXRecord:
5936     case Decl::Record: {
5937       RecordDecl *RD = cast<RecordDecl>(D);
5938       if (RD->isCompleteDefinition())
5939         RewriteRecordBody(RD);
5940       break;
5941     }
5942     default:
5943       break;
5944   }
5945   // Nothing yet.
5946 }
5947 
5948 /// Write_ProtocolExprReferencedMetadata - This routine writer out the
5949 /// protocol reference symbols in the for of:
5950 /// struct _protocol_t *PROTOCOL_REF = &PROTOCOL_METADATA.
5951 static void Write_ProtocolExprReferencedMetadata(ASTContext *Context,
5952                                                  ObjCProtocolDecl *PDecl,
5953                                                  std::string &Result) {
5954   // Also output .objc_protorefs$B section and its meta-data.
5955   if (Context->getLangOpts().MicrosoftExt)
5956     Result += "static ";
5957   Result += "struct _protocol_t *";
5958   Result += "_OBJC_PROTOCOL_REFERENCE_$_";
5959   Result += PDecl->getNameAsString();
5960   Result += " = &";
5961   Result += "_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
5962   Result += ";\n";
5963 }
5964 
5965 void RewriteModernObjC::HandleTranslationUnit(ASTContext &C) {
5966   if (Diags.hasErrorOccurred())
5967     return;
5968 
5969   RewriteInclude();
5970 
5971   for (unsigned i = 0, e = FunctionDefinitionsSeen.size(); i < e; i++) {
5972     // translation of function bodies were postponed until all class and
5973     // their extensions and implementations are seen. This is because, we
5974     // cannot build grouping structs for bitfields until they are all seen.
5975     FunctionDecl *FDecl = FunctionDefinitionsSeen[i];
5976     HandleTopLevelSingleDecl(FDecl);
5977   }
5978 
5979   // Here's a great place to add any extra declarations that may be needed.
5980   // Write out meta data for each @protocol(<expr>).
5981   for (llvm::SmallPtrSet<ObjCProtocolDecl *,8>::iterator I = ProtocolExprDecls.begin(),
5982        E = ProtocolExprDecls.end(); I != E; ++I) {
5983     RewriteObjCProtocolMetaData(*I, Preamble);
5984     Write_ProtocolExprReferencedMetadata(Context, (*I), Preamble);
5985   }
5986 
5987   InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
5988 
5989   if (ClassImplementation.size() || CategoryImplementation.size())
5990     RewriteImplementations();
5991 
5992   for (unsigned i = 0, e = ObjCInterfacesSeen.size(); i < e; i++) {
5993     ObjCInterfaceDecl *CDecl = ObjCInterfacesSeen[i];
5994     // Write struct declaration for the class matching its ivar declarations.
5995     // Note that for modern abi, this is postponed until the end of TU
5996     // because class extensions and the implementation might declare their own
5997     // private ivars.
5998     RewriteInterfaceDecl(CDecl);
5999   }
6000 
6001   // Get the buffer corresponding to MainFileID.  If we haven't changed it, then
6002   // we are done.
6003   if (const RewriteBuffer *RewriteBuf =
6004       Rewrite.getRewriteBufferFor(MainFileID)) {
6005     //printf("Changed:\n");
6006     *OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
6007   } else {
6008     llvm::errs() << "No changes\n";
6009   }
6010 
6011   if (ClassImplementation.size() || CategoryImplementation.size() ||
6012       ProtocolExprDecls.size()) {
6013     // Rewrite Objective-c meta data*
6014     std::string ResultStr;
6015     RewriteMetaDataIntoBuffer(ResultStr);
6016     // Emit metadata.
6017     *OutFile << ResultStr;
6018   }
6019   // Emit ImageInfo;
6020   {
6021     std::string ResultStr;
6022     WriteImageInfo(ResultStr);
6023     *OutFile << ResultStr;
6024   }
6025   OutFile->flush();
6026 }
6027 
6028 void RewriteModernObjC::Initialize(ASTContext &context) {
6029   InitializeCommon(context);
6030 
6031   Preamble += "#ifndef __OBJC2__\n";
6032   Preamble += "#define __OBJC2__\n";
6033   Preamble += "#endif\n";
6034 
6035   // declaring objc_selector outside the parameter list removes a silly
6036   // scope related warning...
6037   if (IsHeader)
6038     Preamble = "#pragma once\n";
6039   Preamble += "struct objc_selector; struct objc_class;\n";
6040   Preamble += "struct __rw_objc_super { \n\tstruct objc_object *object; ";
6041   Preamble += "\n\tstruct objc_object *superClass; ";
6042   // Add a constructor for creating temporary objects.
6043   Preamble += "\n\t__rw_objc_super(struct objc_object *o, struct objc_object *s) ";
6044   Preamble += ": object(o), superClass(s) {} ";
6045   Preamble += "\n};\n";
6046 
6047   if (LangOpts.MicrosoftExt) {
6048     // Define all sections using syntax that makes sense.
6049     // These are currently generated.
6050     Preamble += "\n#pragma section(\".objc_classlist$B\", long, read, write)\n";
6051     Preamble += "#pragma section(\".objc_catlist$B\", long, read, write)\n";
6052     Preamble += "#pragma section(\".objc_imageinfo$B\", long, read, write)\n";
6053     Preamble += "#pragma section(\".objc_nlclslist$B\", long, read, write)\n";
6054     Preamble += "#pragma section(\".objc_nlcatlist$B\", long, read, write)\n";
6055     // These are generated but not necessary for functionality.
6056     Preamble += "#pragma section(\".cat_cls_meth$B\", long, read, write)\n";
6057     Preamble += "#pragma section(\".inst_meth$B\", long, read, write)\n";
6058     Preamble += "#pragma section(\".cls_meth$B\", long, read, write)\n";
6059     Preamble += "#pragma section(\".objc_ivar$B\", long, read, write)\n";
6060 
6061     // These need be generated for performance. Currently they are not,
6062     // using API calls instead.
6063     Preamble += "#pragma section(\".objc_selrefs$B\", long, read, write)\n";
6064     Preamble += "#pragma section(\".objc_classrefs$B\", long, read, write)\n";
6065     Preamble += "#pragma section(\".objc_superrefs$B\", long, read, write)\n";
6066 
6067   }
6068   Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
6069   Preamble += "typedef struct objc_object Protocol;\n";
6070   Preamble += "#define _REWRITER_typedef_Protocol\n";
6071   Preamble += "#endif\n";
6072   if (LangOpts.MicrosoftExt) {
6073     Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
6074     Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
6075   }
6076   else
6077     Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
6078 
6079   Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend(void);\n";
6080   Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper(void);\n";
6081   Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_stret(void);\n";
6082   Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSendSuper_stret(void);\n";
6083   Preamble += "__OBJC_RW_DLLIMPORT void objc_msgSend_fpret(void);\n";
6084 
6085   Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getClass";
6086   Preamble += "(const char *);\n";
6087   Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
6088   Preamble += "(struct objc_class *);\n";
6089   Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *objc_getMetaClass";
6090   Preamble += "(const char *);\n";
6091   Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw( struct objc_object *);\n";
6092   // @synchronized hooks.
6093   Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter( struct objc_object *);\n";
6094   Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit( struct objc_object *);\n";
6095   Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
6096   Preamble += "#ifdef _WIN64\n";
6097   Preamble += "typedef unsigned long long  _WIN_NSUInteger;\n";
6098   Preamble += "#else\n";
6099   Preamble += "typedef unsigned int _WIN_NSUInteger;\n";
6100   Preamble += "#endif\n";
6101   Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
6102   Preamble += "struct __objcFastEnumerationState {\n\t";
6103   Preamble += "unsigned long state;\n\t";
6104   Preamble += "void **itemsPtr;\n\t";
6105   Preamble += "unsigned long *mutationsPtr;\n\t";
6106   Preamble += "unsigned long extra[5];\n};\n";
6107   Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
6108   Preamble += "#define __FASTENUMERATIONSTATE\n";
6109   Preamble += "#endif\n";
6110   Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
6111   Preamble += "struct __NSConstantStringImpl {\n";
6112   Preamble += "  int *isa;\n";
6113   Preamble += "  int flags;\n";
6114   Preamble += "  char *str;\n";
6115   Preamble += "#if _WIN64\n";
6116   Preamble += "  long long length;\n";
6117   Preamble += "#else\n";
6118   Preamble += "  long length;\n";
6119   Preamble += "#endif\n";
6120   Preamble += "};\n";
6121   Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
6122   Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
6123   Preamble += "#else\n";
6124   Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
6125   Preamble += "#endif\n";
6126   Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
6127   Preamble += "#endif\n";
6128   // Blocks preamble.
6129   Preamble += "#ifndef BLOCK_IMPL\n";
6130   Preamble += "#define BLOCK_IMPL\n";
6131   Preamble += "struct __block_impl {\n";
6132   Preamble += "  void *isa;\n";
6133   Preamble += "  int Flags;\n";
6134   Preamble += "  int Reserved;\n";
6135   Preamble += "  void *FuncPtr;\n";
6136   Preamble += "};\n";
6137   Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
6138   Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
6139   Preamble += "extern \"C\" __declspec(dllexport) "
6140   "void _Block_object_assign(void *, const void *, const int);\n";
6141   Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
6142   Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
6143   Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
6144   Preamble += "#else\n";
6145   Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
6146   Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
6147   Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
6148   Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
6149   Preamble += "#endif\n";
6150   Preamble += "#endif\n";
6151   if (LangOpts.MicrosoftExt) {
6152     Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
6153     Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
6154     Preamble += "#ifndef KEEP_ATTRIBUTES\n";  // We use this for clang tests.
6155     Preamble += "#define __attribute__(X)\n";
6156     Preamble += "#endif\n";
6157     Preamble += "#ifndef __weak\n";
6158     Preamble += "#define __weak\n";
6159     Preamble += "#endif\n";
6160     Preamble += "#ifndef __block\n";
6161     Preamble += "#define __block\n";
6162     Preamble += "#endif\n";
6163   }
6164   else {
6165     Preamble += "#define __block\n";
6166     Preamble += "#define __weak\n";
6167   }
6168 
6169   // Declarations required for modern objective-c array and dictionary literals.
6170   Preamble += "\n#include <stdarg.h>\n";
6171   Preamble += "struct __NSContainer_literal {\n";
6172   Preamble += "  void * *arr;\n";
6173   Preamble += "  __NSContainer_literal (unsigned int count, ...) {\n";
6174   Preamble += "\tva_list marker;\n";
6175   Preamble += "\tva_start(marker, count);\n";
6176   Preamble += "\tarr = new void *[count];\n";
6177   Preamble += "\tfor (unsigned i = 0; i < count; i++)\n";
6178   Preamble += "\t  arr[i] = va_arg(marker, void *);\n";
6179   Preamble += "\tva_end( marker );\n";
6180   Preamble += "  };\n";
6181   Preamble += "  ~__NSContainer_literal() {\n";
6182   Preamble += "\tdelete[] arr;\n";
6183   Preamble += "  }\n";
6184   Preamble += "};\n";
6185 
6186   // Declaration required for implementation of @autoreleasepool statement.
6187   Preamble += "extern \"C\" __declspec(dllimport) void * objc_autoreleasePoolPush(void);\n";
6188   Preamble += "extern \"C\" __declspec(dllimport) void objc_autoreleasePoolPop(void *);\n\n";
6189   Preamble += "struct __AtAutoreleasePool {\n";
6190   Preamble += "  __AtAutoreleasePool() {atautoreleasepoolobj = objc_autoreleasePoolPush();}\n";
6191   Preamble += "  ~__AtAutoreleasePool() {objc_autoreleasePoolPop(atautoreleasepoolobj);}\n";
6192   Preamble += "  void * atautoreleasepoolobj;\n";
6193   Preamble += "};\n";
6194 
6195   // NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
6196   // as this avoids warning in any 64bit/32bit compilation model.
6197   Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
6198 }
6199 
6200 /// RewriteIvarOffsetComputation - This rutine synthesizes computation of
6201 /// ivar offset.
6202 void RewriteModernObjC::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
6203                                                          std::string &Result) {
6204   Result += "__OFFSETOFIVAR__(struct ";
6205   Result += ivar->getContainingInterface()->getNameAsString();
6206   if (LangOpts.MicrosoftExt)
6207     Result += "_IMPL";
6208   Result += ", ";
6209   if (ivar->isBitField())
6210     ObjCIvarBitfieldGroupDecl(ivar, Result);
6211   else
6212     Result += ivar->getNameAsString();
6213   Result += ")";
6214 }
6215 
6216 /// WriteModernMetadataDeclarations - Writes out metadata declarations for modern ABI.
6217 /// struct _prop_t {
6218 ///   const char *name;
6219 ///   char *attributes;
6220 /// }
6221 
6222 /// struct _prop_list_t {
6223 ///   uint32_t entsize;      // sizeof(struct _prop_t)
6224 ///   uint32_t count_of_properties;
6225 ///   struct _prop_t prop_list[count_of_properties];
6226 /// }
6227 
6228 /// struct _protocol_t;
6229 
6230 /// struct _protocol_list_t {
6231 ///   long protocol_count;   // Note, this is 32/64 bit
6232 ///   struct _protocol_t * protocol_list[protocol_count];
6233 /// }
6234 
6235 /// struct _objc_method {
6236 ///   SEL _cmd;
6237 ///   const char *method_type;
6238 ///   char *_imp;
6239 /// }
6240 
6241 /// struct _method_list_t {
6242 ///   uint32_t entsize;  // sizeof(struct _objc_method)
6243 ///   uint32_t method_count;
6244 ///   struct _objc_method method_list[method_count];
6245 /// }
6246 
6247 /// struct _protocol_t {
6248 ///   id isa;  // NULL
6249 ///   const char *protocol_name;
6250 ///   const struct _protocol_list_t * protocol_list; // super protocols
6251 ///   const struct method_list_t *instance_methods;
6252 ///   const struct method_list_t *class_methods;
6253 ///   const struct method_list_t *optionalInstanceMethods;
6254 ///   const struct method_list_t *optionalClassMethods;
6255 ///   const struct _prop_list_t * properties;
6256 ///   const uint32_t size;  // sizeof(struct _protocol_t)
6257 ///   const uint32_t flags;  // = 0
6258 ///   const char ** extendedMethodTypes;
6259 /// }
6260 
6261 /// struct _ivar_t {
6262 ///   unsigned long int *offset;  // pointer to ivar offset location
6263 ///   const char *name;
6264 ///   const char *type;
6265 ///   uint32_t alignment;
6266 ///   uint32_t size;
6267 /// }
6268 
6269 /// struct _ivar_list_t {
6270 ///   uint32 entsize;  // sizeof(struct _ivar_t)
6271 ///   uint32 count;
6272 ///   struct _ivar_t list[count];
6273 /// }
6274 
6275 /// struct _class_ro_t {
6276 ///   uint32_t flags;
6277 ///   uint32_t instanceStart;
6278 ///   uint32_t instanceSize;
6279 ///   uint32_t reserved;  // only when building for 64bit targets
6280 ///   const uint8_t *ivarLayout;
6281 ///   const char *name;
6282 ///   const struct _method_list_t *baseMethods;
6283 ///   const struct _protocol_list_t *baseProtocols;
6284 ///   const struct _ivar_list_t *ivars;
6285 ///   const uint8_t *weakIvarLayout;
6286 ///   const struct _prop_list_t *properties;
6287 /// }
6288 
6289 /// struct _class_t {
6290 ///   struct _class_t *isa;
6291 ///   struct _class_t *superclass;
6292 ///   void *cache;
6293 ///   IMP *vtable;
6294 ///   struct _class_ro_t *ro;
6295 /// }
6296 
6297 /// struct _category_t {
6298 ///   const char *name;
6299 ///   struct _class_t *cls;
6300 ///   const struct _method_list_t *instance_methods;
6301 ///   const struct _method_list_t *class_methods;
6302 ///   const struct _protocol_list_t *protocols;
6303 ///   const struct _prop_list_t *properties;
6304 /// }
6305 
6306 /// MessageRefTy - LLVM for:
6307 /// struct _message_ref_t {
6308 ///   IMP messenger;
6309 ///   SEL name;
6310 /// };
6311 
6312 /// SuperMessageRefTy - LLVM for:
6313 /// struct _super_message_ref_t {
6314 ///   SUPER_IMP messenger;
6315 ///   SEL name;
6316 /// };
6317 
6318 static void WriteModernMetadataDeclarations(ASTContext *Context, std::string &Result) {
6319   static bool meta_data_declared = false;
6320   if (meta_data_declared)
6321     return;
6322 
6323   Result += "\nstruct _prop_t {\n";
6324   Result += "\tconst char *name;\n";
6325   Result += "\tconst char *attributes;\n";
6326   Result += "};\n";
6327 
6328   Result += "\nstruct _protocol_t;\n";
6329 
6330   Result += "\nstruct _objc_method {\n";
6331   Result += "\tstruct objc_selector * _cmd;\n";
6332   Result += "\tconst char *method_type;\n";
6333   Result += "\tvoid  *_imp;\n";
6334   Result += "};\n";
6335 
6336   Result += "\nstruct _protocol_t {\n";
6337   Result += "\tvoid * isa;  // NULL\n";
6338   Result += "\tconst char *protocol_name;\n";
6339   Result += "\tconst struct _protocol_list_t * protocol_list; // super protocols\n";
6340   Result += "\tconst struct method_list_t *instance_methods;\n";
6341   Result += "\tconst struct method_list_t *class_methods;\n";
6342   Result += "\tconst struct method_list_t *optionalInstanceMethods;\n";
6343   Result += "\tconst struct method_list_t *optionalClassMethods;\n";
6344   Result += "\tconst struct _prop_list_t * properties;\n";
6345   Result += "\tconst unsigned int size;  // sizeof(struct _protocol_t)\n";
6346   Result += "\tconst unsigned int flags;  // = 0\n";
6347   Result += "\tconst char ** extendedMethodTypes;\n";
6348   Result += "};\n";
6349 
6350   Result += "\nstruct _ivar_t {\n";
6351   Result += "\tunsigned long int *offset;  // pointer to ivar offset location\n";
6352   Result += "\tconst char *name;\n";
6353   Result += "\tconst char *type;\n";
6354   Result += "\tunsigned int alignment;\n";
6355   Result += "\tunsigned int  size;\n";
6356   Result += "};\n";
6357 
6358   Result += "\nstruct _class_ro_t {\n";
6359   Result += "\tunsigned int flags;\n";
6360   Result += "\tunsigned int instanceStart;\n";
6361   Result += "\tunsigned int instanceSize;\n";
6362   const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
6363   if (Triple.getArch() == llvm::Triple::x86_64)
6364     Result += "\tunsigned int reserved;\n";
6365   Result += "\tconst unsigned char *ivarLayout;\n";
6366   Result += "\tconst char *name;\n";
6367   Result += "\tconst struct _method_list_t *baseMethods;\n";
6368   Result += "\tconst struct _objc_protocol_list *baseProtocols;\n";
6369   Result += "\tconst struct _ivar_list_t *ivars;\n";
6370   Result += "\tconst unsigned char *weakIvarLayout;\n";
6371   Result += "\tconst struct _prop_list_t *properties;\n";
6372   Result += "};\n";
6373 
6374   Result += "\nstruct _class_t {\n";
6375   Result += "\tstruct _class_t *isa;\n";
6376   Result += "\tstruct _class_t *superclass;\n";
6377   Result += "\tvoid *cache;\n";
6378   Result += "\tvoid *vtable;\n";
6379   Result += "\tstruct _class_ro_t *ro;\n";
6380   Result += "};\n";
6381 
6382   Result += "\nstruct _category_t {\n";
6383   Result += "\tconst char *name;\n";
6384   Result += "\tstruct _class_t *cls;\n";
6385   Result += "\tconst struct _method_list_t *instance_methods;\n";
6386   Result += "\tconst struct _method_list_t *class_methods;\n";
6387   Result += "\tconst struct _protocol_list_t *protocols;\n";
6388   Result += "\tconst struct _prop_list_t *properties;\n";
6389   Result += "};\n";
6390 
6391   Result += "extern \"C\" __declspec(dllimport) struct objc_cache _objc_empty_cache;\n";
6392   Result += "#pragma warning(disable:4273)\n";
6393   meta_data_declared = true;
6394 }
6395 
6396 static void Write_protocol_list_t_TypeDecl(std::string &Result,
6397                                            long super_protocol_count) {
6398   Result += "struct /*_protocol_list_t*/"; Result += " {\n";
6399   Result += "\tlong protocol_count;  // Note, this is 32/64 bit\n";
6400   Result += "\tstruct _protocol_t *super_protocols[";
6401   Result += utostr(super_protocol_count); Result += "];\n";
6402   Result += "}";
6403 }
6404 
6405 static void Write_method_list_t_TypeDecl(std::string &Result,
6406                                          unsigned int method_count) {
6407   Result += "struct /*_method_list_t*/"; Result += " {\n";
6408   Result += "\tunsigned int entsize;  // sizeof(struct _objc_method)\n";
6409   Result += "\tunsigned int method_count;\n";
6410   Result += "\tstruct _objc_method method_list[";
6411   Result += utostr(method_count); Result += "];\n";
6412   Result += "}";
6413 }
6414 
6415 static void Write__prop_list_t_TypeDecl(std::string &Result,
6416                                         unsigned int property_count) {
6417   Result += "struct /*_prop_list_t*/"; Result += " {\n";
6418   Result += "\tunsigned int entsize;  // sizeof(struct _prop_t)\n";
6419   Result += "\tunsigned int count_of_properties;\n";
6420   Result += "\tstruct _prop_t prop_list[";
6421   Result += utostr(property_count); Result += "];\n";
6422   Result += "}";
6423 }
6424 
6425 static void Write__ivar_list_t_TypeDecl(std::string &Result,
6426                                         unsigned int ivar_count) {
6427   Result += "struct /*_ivar_list_t*/"; Result += " {\n";
6428   Result += "\tunsigned int entsize;  // sizeof(struct _prop_t)\n";
6429   Result += "\tunsigned int count;\n";
6430   Result += "\tstruct _ivar_t ivar_list[";
6431   Result += utostr(ivar_count); Result += "];\n";
6432   Result += "}";
6433 }
6434 
6435 static void Write_protocol_list_initializer(ASTContext *Context, std::string &Result,
6436                                             ArrayRef<ObjCProtocolDecl *> SuperProtocols,
6437                                             StringRef VarName,
6438                                             StringRef ProtocolName) {
6439   if (SuperProtocols.size() > 0) {
6440     Result += "\nstatic ";
6441     Write_protocol_list_t_TypeDecl(Result, SuperProtocols.size());
6442     Result += " "; Result += VarName;
6443     Result += ProtocolName;
6444     Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6445     Result += "\t"; Result += utostr(SuperProtocols.size()); Result += ",\n";
6446     for (unsigned i = 0, e = SuperProtocols.size(); i < e; i++) {
6447       ObjCProtocolDecl *SuperPD = SuperProtocols[i];
6448       Result += "\t&"; Result += "_OBJC_PROTOCOL_";
6449       Result += SuperPD->getNameAsString();
6450       if (i == e-1)
6451         Result += "\n};\n";
6452       else
6453         Result += ",\n";
6454     }
6455   }
6456 }
6457 
6458 static void Write_method_list_t_initializer(RewriteModernObjC &RewriteObj,
6459                                             ASTContext *Context, std::string &Result,
6460                                             ArrayRef<ObjCMethodDecl *> Methods,
6461                                             StringRef VarName,
6462                                             StringRef TopLevelDeclName,
6463                                             bool MethodImpl) {
6464   if (Methods.size() > 0) {
6465     Result += "\nstatic ";
6466     Write_method_list_t_TypeDecl(Result, Methods.size());
6467     Result += " "; Result += VarName;
6468     Result += TopLevelDeclName;
6469     Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6470     Result += "\t"; Result += "sizeof(_objc_method)"; Result += ",\n";
6471     Result += "\t"; Result += utostr(Methods.size()); Result += ",\n";
6472     for (unsigned i = 0, e = Methods.size(); i < e; i++) {
6473       ObjCMethodDecl *MD = Methods[i];
6474       if (i == 0)
6475         Result += "\t{{(struct objc_selector *)\"";
6476       else
6477         Result += "\t{(struct objc_selector *)\"";
6478       Result += (MD)->getSelector().getAsString(); Result += "\"";
6479       Result += ", ";
6480       std::string MethodTypeString;
6481       Context->getObjCEncodingForMethodDecl(MD, MethodTypeString);
6482       Result += "\""; Result += MethodTypeString; Result += "\"";
6483       Result += ", ";
6484       if (!MethodImpl)
6485         Result += "0";
6486       else {
6487         Result += "(void *)";
6488         Result += RewriteObj.MethodInternalNames[MD];
6489       }
6490       if (i  == e-1)
6491         Result += "}}\n";
6492       else
6493         Result += "},\n";
6494     }
6495     Result += "};\n";
6496   }
6497 }
6498 
6499 static void Write_prop_list_t_initializer(RewriteModernObjC &RewriteObj,
6500                                            ASTContext *Context, std::string &Result,
6501                                            ArrayRef<ObjCPropertyDecl *> Properties,
6502                                            const Decl *Container,
6503                                            StringRef VarName,
6504                                            StringRef ProtocolName) {
6505   if (Properties.size() > 0) {
6506     Result += "\nstatic ";
6507     Write__prop_list_t_TypeDecl(Result, Properties.size());
6508     Result += " "; Result += VarName;
6509     Result += ProtocolName;
6510     Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6511     Result += "\t"; Result += "sizeof(_prop_t)"; Result += ",\n";
6512     Result += "\t"; Result += utostr(Properties.size()); Result += ",\n";
6513     for (unsigned i = 0, e = Properties.size(); i < e; i++) {
6514       ObjCPropertyDecl *PropDecl = Properties[i];
6515       if (i == 0)
6516         Result += "\t{{\"";
6517       else
6518         Result += "\t{\"";
6519       Result += PropDecl->getName(); Result += "\",";
6520       std::string PropertyTypeString, QuotePropertyTypeString;
6521       Context->getObjCEncodingForPropertyDecl(PropDecl, Container, PropertyTypeString);
6522       RewriteObj.QuoteDoublequotes(PropertyTypeString, QuotePropertyTypeString);
6523       Result += "\""; Result += QuotePropertyTypeString; Result += "\"";
6524       if (i  == e-1)
6525         Result += "}}\n";
6526       else
6527         Result += "},\n";
6528     }
6529     Result += "};\n";
6530   }
6531 }
6532 
6533 // Metadata flags
6534 enum MetaDataDlags {
6535   CLS = 0x0,
6536   CLS_META = 0x1,
6537   CLS_ROOT = 0x2,
6538   OBJC2_CLS_HIDDEN = 0x10,
6539   CLS_EXCEPTION = 0x20,
6540 
6541   /// (Obsolete) ARC-specific: this class has a .release_ivars method
6542   CLS_HAS_IVAR_RELEASER = 0x40,
6543   /// class was compiled with -fobjc-arr
6544   CLS_COMPILED_BY_ARC = 0x80  // (1<<7)
6545 };
6546 
6547 static void Write__class_ro_t_initializer(ASTContext *Context, std::string &Result,
6548                                           unsigned int flags,
6549                                           const std::string &InstanceStart,
6550                                           const std::string &InstanceSize,
6551                                           ArrayRef<ObjCMethodDecl *>baseMethods,
6552                                           ArrayRef<ObjCProtocolDecl *>baseProtocols,
6553                                           ArrayRef<ObjCIvarDecl *>ivars,
6554                                           ArrayRef<ObjCPropertyDecl *>Properties,
6555                                           StringRef VarName,
6556                                           StringRef ClassName) {
6557   Result += "\nstatic struct _class_ro_t ";
6558   Result += VarName; Result += ClassName;
6559   Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6560   Result += "\t";
6561   Result += llvm::utostr(flags); Result += ", ";
6562   Result += InstanceStart; Result += ", ";
6563   Result += InstanceSize; Result += ", \n";
6564   Result += "\t";
6565   const llvm::Triple &Triple(Context->getTargetInfo().getTriple());
6566   if (Triple.getArch() == llvm::Triple::x86_64)
6567     // uint32_t const reserved; // only when building for 64bit targets
6568     Result += "(unsigned int)0, \n\t";
6569   // const uint8_t * const ivarLayout;
6570   Result += "0, \n\t";
6571   Result += "\""; Result += ClassName; Result += "\",\n\t";
6572   bool metaclass = ((flags & CLS_META) != 0);
6573   if (baseMethods.size() > 0) {
6574     Result += "(const struct _method_list_t *)&";
6575     if (metaclass)
6576       Result += "_OBJC_$_CLASS_METHODS_";
6577     else
6578       Result += "_OBJC_$_INSTANCE_METHODS_";
6579     Result += ClassName;
6580     Result += ",\n\t";
6581   }
6582   else
6583     Result += "0, \n\t";
6584 
6585   if (!metaclass && baseProtocols.size() > 0) {
6586     Result += "(const struct _objc_protocol_list *)&";
6587     Result += "_OBJC_CLASS_PROTOCOLS_$_"; Result += ClassName;
6588     Result += ",\n\t";
6589   }
6590   else
6591     Result += "0, \n\t";
6592 
6593   if (!metaclass && ivars.size() > 0) {
6594     Result += "(const struct _ivar_list_t *)&";
6595     Result += "_OBJC_$_INSTANCE_VARIABLES_"; Result += ClassName;
6596     Result += ",\n\t";
6597   }
6598   else
6599     Result += "0, \n\t";
6600 
6601   // weakIvarLayout
6602   Result += "0, \n\t";
6603   if (!metaclass && Properties.size() > 0) {
6604     Result += "(const struct _prop_list_t *)&";
6605     Result += "_OBJC_$_PROP_LIST_"; Result += ClassName;
6606     Result += ",\n";
6607   }
6608   else
6609     Result += "0, \n";
6610 
6611   Result += "};\n";
6612 }
6613 
6614 static void Write_class_t(ASTContext *Context, std::string &Result,
6615                           StringRef VarName,
6616                           const ObjCInterfaceDecl *CDecl, bool metaclass) {
6617   bool rootClass = (!CDecl->getSuperClass());
6618   const ObjCInterfaceDecl *RootClass = CDecl;
6619 
6620   if (!rootClass) {
6621     // Find the Root class
6622     RootClass = CDecl->getSuperClass();
6623     while (RootClass->getSuperClass()) {
6624       RootClass = RootClass->getSuperClass();
6625     }
6626   }
6627 
6628   if (metaclass && rootClass) {
6629     // Need to handle a case of use of forward declaration.
6630     Result += "\n";
6631     Result += "extern \"C\" ";
6632     if (CDecl->getImplementation())
6633       Result += "__declspec(dllexport) ";
6634     else
6635       Result += "__declspec(dllimport) ";
6636 
6637     Result += "struct _class_t OBJC_CLASS_$_";
6638     Result += CDecl->getNameAsString();
6639     Result += ";\n";
6640   }
6641   // Also, for possibility of 'super' metadata class not having been defined yet.
6642   if (!rootClass) {
6643     ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
6644     Result += "\n";
6645     Result += "extern \"C\" ";
6646     if (SuperClass->getImplementation())
6647       Result += "__declspec(dllexport) ";
6648     else
6649       Result += "__declspec(dllimport) ";
6650 
6651     Result += "struct _class_t ";
6652     Result += VarName;
6653     Result += SuperClass->getNameAsString();
6654     Result += ";\n";
6655 
6656     if (metaclass && RootClass != SuperClass) {
6657       Result += "extern \"C\" ";
6658       if (RootClass->getImplementation())
6659         Result += "__declspec(dllexport) ";
6660       else
6661         Result += "__declspec(dllimport) ";
6662 
6663       Result += "struct _class_t ";
6664       Result += VarName;
6665       Result += RootClass->getNameAsString();
6666       Result += ";\n";
6667     }
6668   }
6669 
6670   Result += "\nextern \"C\" __declspec(dllexport) struct _class_t ";
6671   Result += VarName; Result += CDecl->getNameAsString();
6672   Result += " __attribute__ ((used, section (\"__DATA,__objc_data\"))) = {\n";
6673   Result += "\t";
6674   if (metaclass) {
6675     if (!rootClass) {
6676       Result += "0, // &"; Result += VarName;
6677       Result += RootClass->getNameAsString();
6678       Result += ",\n\t";
6679       Result += "0, // &"; Result += VarName;
6680       Result += CDecl->getSuperClass()->getNameAsString();
6681       Result += ",\n\t";
6682     }
6683     else {
6684       Result += "0, // &"; Result += VarName;
6685       Result += CDecl->getNameAsString();
6686       Result += ",\n\t";
6687       Result += "0, // &OBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6688       Result += ",\n\t";
6689     }
6690   }
6691   else {
6692     Result += "0, // &OBJC_METACLASS_$_";
6693     Result += CDecl->getNameAsString();
6694     Result += ",\n\t";
6695     if (!rootClass) {
6696       Result += "0, // &"; Result += VarName;
6697       Result += CDecl->getSuperClass()->getNameAsString();
6698       Result += ",\n\t";
6699     }
6700     else
6701       Result += "0,\n\t";
6702   }
6703   Result += "0, // (void *)&_objc_empty_cache,\n\t";
6704   Result += "0, // unused, was (void *)&_objc_empty_vtable,\n\t";
6705   if (metaclass)
6706     Result += "&_OBJC_METACLASS_RO_$_";
6707   else
6708     Result += "&_OBJC_CLASS_RO_$_";
6709   Result += CDecl->getNameAsString();
6710   Result += ",\n};\n";
6711 
6712   // Add static function to initialize some of the meta-data fields.
6713   // avoid doing it twice.
6714   if (metaclass)
6715     return;
6716 
6717   const ObjCInterfaceDecl *SuperClass =
6718     rootClass ? CDecl : CDecl->getSuperClass();
6719 
6720   Result += "static void OBJC_CLASS_SETUP_$_";
6721   Result += CDecl->getNameAsString();
6722   Result += "(void ) {\n";
6723   Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6724   Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
6725   Result += RootClass->getNameAsString(); Result += ";\n";
6726 
6727   Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6728   Result += ".superclass = ";
6729   if (rootClass)
6730     Result += "&OBJC_CLASS_$_";
6731   else
6732      Result += "&OBJC_METACLASS_$_";
6733 
6734   Result += SuperClass->getNameAsString(); Result += ";\n";
6735 
6736   Result += "\tOBJC_METACLASS_$_"; Result += CDecl->getNameAsString();
6737   Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
6738 
6739   Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6740   Result += ".isa = "; Result += "&OBJC_METACLASS_$_";
6741   Result += CDecl->getNameAsString(); Result += ";\n";
6742 
6743   if (!rootClass) {
6744     Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6745     Result += ".superclass = "; Result += "&OBJC_CLASS_$_";
6746     Result += SuperClass->getNameAsString(); Result += ";\n";
6747   }
6748 
6749   Result += "\tOBJC_CLASS_$_"; Result += CDecl->getNameAsString();
6750   Result += ".cache = "; Result += "&_objc_empty_cache"; Result += ";\n";
6751   Result += "}\n";
6752 }
6753 
6754 static void Write_category_t(RewriteModernObjC &RewriteObj, ASTContext *Context,
6755                              std::string &Result,
6756                              ObjCCategoryDecl *CatDecl,
6757                              ObjCInterfaceDecl *ClassDecl,
6758                              ArrayRef<ObjCMethodDecl *> InstanceMethods,
6759                              ArrayRef<ObjCMethodDecl *> ClassMethods,
6760                              ArrayRef<ObjCProtocolDecl *> RefedProtocols,
6761                              ArrayRef<ObjCPropertyDecl *> ClassProperties) {
6762   StringRef CatName = CatDecl->getName();
6763   StringRef ClassName = ClassDecl->getName();
6764   // must declare an extern class object in case this class is not implemented
6765   // in this TU.
6766   Result += "\n";
6767   Result += "extern \"C\" ";
6768   if (ClassDecl->getImplementation())
6769     Result += "__declspec(dllexport) ";
6770   else
6771     Result += "__declspec(dllimport) ";
6772 
6773   Result += "struct _class_t ";
6774   Result += "OBJC_CLASS_$_"; Result += ClassName;
6775   Result += ";\n";
6776 
6777   Result += "\nstatic struct _category_t ";
6778   Result += "_OBJC_$_CATEGORY_";
6779   Result += ClassName; Result += "_$_"; Result += CatName;
6780   Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
6781   Result += "{\n";
6782   Result += "\t\""; Result += ClassName; Result += "\",\n";
6783   Result += "\t0, // &"; Result += "OBJC_CLASS_$_"; Result += ClassName;
6784   Result += ",\n";
6785   if (InstanceMethods.size() > 0) {
6786     Result += "\t(const struct _method_list_t *)&";
6787     Result += "_OBJC_$_CATEGORY_INSTANCE_METHODS_";
6788     Result += ClassName; Result += "_$_"; Result += CatName;
6789     Result += ",\n";
6790   }
6791   else
6792     Result += "\t0,\n";
6793 
6794   if (ClassMethods.size() > 0) {
6795     Result += "\t(const struct _method_list_t *)&";
6796     Result += "_OBJC_$_CATEGORY_CLASS_METHODS_";
6797     Result += ClassName; Result += "_$_"; Result += CatName;
6798     Result += ",\n";
6799   }
6800   else
6801     Result += "\t0,\n";
6802 
6803   if (RefedProtocols.size() > 0) {
6804     Result += "\t(const struct _protocol_list_t *)&";
6805     Result += "_OBJC_CATEGORY_PROTOCOLS_$_";
6806     Result += ClassName; Result += "_$_"; Result += CatName;
6807     Result += ",\n";
6808   }
6809   else
6810     Result += "\t0,\n";
6811 
6812   if (ClassProperties.size() > 0) {
6813     Result += "\t(const struct _prop_list_t *)&";  Result += "_OBJC_$_PROP_LIST_";
6814     Result += ClassName; Result += "_$_"; Result += CatName;
6815     Result += ",\n";
6816   }
6817   else
6818     Result += "\t0,\n";
6819 
6820   Result += "};\n";
6821 
6822   // Add static function to initialize the class pointer in the category structure.
6823   Result += "static void OBJC_CATEGORY_SETUP_$_";
6824   Result += ClassDecl->getNameAsString();
6825   Result += "_$_";
6826   Result += CatName;
6827   Result += "(void ) {\n";
6828   Result += "\t_OBJC_$_CATEGORY_";
6829   Result += ClassDecl->getNameAsString();
6830   Result += "_$_";
6831   Result += CatName;
6832   Result += ".cls = "; Result += "&OBJC_CLASS_$_"; Result += ClassName;
6833   Result += ";\n}\n";
6834 }
6835 
6836 static void Write__extendedMethodTypes_initializer(RewriteModernObjC &RewriteObj,
6837                                            ASTContext *Context, std::string &Result,
6838                                            ArrayRef<ObjCMethodDecl *> Methods,
6839                                            StringRef VarName,
6840                                            StringRef ProtocolName) {
6841   if (Methods.size() == 0)
6842     return;
6843 
6844   Result += "\nstatic const char *";
6845   Result += VarName; Result += ProtocolName;
6846   Result += " [] __attribute__ ((used, section (\"__DATA,__objc_const\"))) = \n";
6847   Result += "{\n";
6848   for (unsigned i = 0, e = Methods.size(); i < e; i++) {
6849     ObjCMethodDecl *MD = Methods[i];
6850     std::string MethodTypeString, QuoteMethodTypeString;
6851     Context->getObjCEncodingForMethodDecl(MD, MethodTypeString, true);
6852     RewriteObj.QuoteDoublequotes(MethodTypeString, QuoteMethodTypeString);
6853     Result += "\t\""; Result += QuoteMethodTypeString; Result += "\"";
6854     if (i == e-1)
6855       Result += "\n};\n";
6856     else {
6857       Result += ",\n";
6858     }
6859   }
6860 }
6861 
6862 static void Write_IvarOffsetVar(RewriteModernObjC &RewriteObj,
6863                                 ASTContext *Context,
6864                                 std::string &Result,
6865                                 ArrayRef<ObjCIvarDecl *> Ivars,
6866                                 ObjCInterfaceDecl *CDecl) {
6867   // FIXME. visibilty of offset symbols may have to be set; for Darwin
6868   // this is what happens:
6869   /**
6870    if (Ivar->getAccessControl() == ObjCIvarDecl::Private ||
6871        Ivar->getAccessControl() == ObjCIvarDecl::Package ||
6872        Class->getVisibility() == HiddenVisibility)
6873      Visibility shoud be: HiddenVisibility;
6874    else
6875      Visibility shoud be: DefaultVisibility;
6876   */
6877 
6878   Result += "\n";
6879   for (unsigned i =0, e = Ivars.size(); i < e; i++) {
6880     ObjCIvarDecl *IvarDecl = Ivars[i];
6881     if (Context->getLangOpts().MicrosoftExt)
6882       Result += "__declspec(allocate(\".objc_ivar$B\")) ";
6883 
6884     if (!Context->getLangOpts().MicrosoftExt ||
6885         IvarDecl->getAccessControl() == ObjCIvarDecl::Private ||
6886         IvarDecl->getAccessControl() == ObjCIvarDecl::Package)
6887       Result += "extern \"C\" unsigned long int ";
6888     else
6889       Result += "extern \"C\" __declspec(dllexport) unsigned long int ";
6890     if (Ivars[i]->isBitField())
6891       RewriteObj.ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
6892     else
6893       WriteInternalIvarName(CDecl, IvarDecl, Result);
6894     Result += " __attribute__ ((used, section (\"__DATA,__objc_ivar\")))";
6895     Result += " = ";
6896     RewriteObj.RewriteIvarOffsetComputation(IvarDecl, Result);
6897     Result += ";\n";
6898     if (Ivars[i]->isBitField()) {
6899       // skip over rest of the ivar bitfields.
6900       SKIP_BITFIELDS(i , e, Ivars);
6901     }
6902   }
6903 }
6904 
6905 static void Write__ivar_list_t_initializer(RewriteModernObjC &RewriteObj,
6906                                            ASTContext *Context, std::string &Result,
6907                                            ArrayRef<ObjCIvarDecl *> OriginalIvars,
6908                                            StringRef VarName,
6909                                            ObjCInterfaceDecl *CDecl) {
6910   if (OriginalIvars.size() > 0) {
6911     Write_IvarOffsetVar(RewriteObj, Context, Result, OriginalIvars, CDecl);
6912     SmallVector<ObjCIvarDecl *, 8> Ivars;
6913     // strip off all but the first ivar bitfield from each group of ivars.
6914     // Such ivars in the ivar list table will be replaced by their grouping struct
6915     // 'ivar'.
6916     for (unsigned i = 0, e = OriginalIvars.size(); i < e; i++) {
6917       if (OriginalIvars[i]->isBitField()) {
6918         Ivars.push_back(OriginalIvars[i]);
6919         // skip over rest of the ivar bitfields.
6920         SKIP_BITFIELDS(i , e, OriginalIvars);
6921       }
6922       else
6923         Ivars.push_back(OriginalIvars[i]);
6924     }
6925 
6926     Result += "\nstatic ";
6927     Write__ivar_list_t_TypeDecl(Result, Ivars.size());
6928     Result += " "; Result += VarName;
6929     Result += CDecl->getNameAsString();
6930     Result += " __attribute__ ((used, section (\"__DATA,__objc_const\"))) = {\n";
6931     Result += "\t"; Result += "sizeof(_ivar_t)"; Result += ",\n";
6932     Result += "\t"; Result += utostr(Ivars.size()); Result += ",\n";
6933     for (unsigned i =0, e = Ivars.size(); i < e; i++) {
6934       ObjCIvarDecl *IvarDecl = Ivars[i];
6935       if (i == 0)
6936         Result += "\t{{";
6937       else
6938         Result += "\t {";
6939       Result += "(unsigned long int *)&";
6940       if (Ivars[i]->isBitField())
6941         RewriteObj.ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
6942       else
6943         WriteInternalIvarName(CDecl, IvarDecl, Result);
6944       Result += ", ";
6945 
6946       Result += "\"";
6947       if (Ivars[i]->isBitField())
6948         RewriteObj.ObjCIvarBitfieldGroupDecl(Ivars[i], Result);
6949       else
6950         Result += IvarDecl->getName();
6951       Result += "\", ";
6952 
6953       QualType IVQT = IvarDecl->getType();
6954       if (IvarDecl->isBitField())
6955         IVQT = RewriteObj.GetGroupRecordTypeForObjCIvarBitfield(IvarDecl);
6956 
6957       std::string IvarTypeString, QuoteIvarTypeString;
6958       Context->getObjCEncodingForType(IVQT, IvarTypeString,
6959                                       IvarDecl);
6960       RewriteObj.QuoteDoublequotes(IvarTypeString, QuoteIvarTypeString);
6961       Result += "\""; Result += QuoteIvarTypeString; Result += "\", ";
6962 
6963       // FIXME. this alignment represents the host alignment and need be changed to
6964       // represent the target alignment.
6965       unsigned Align = Context->getTypeAlign(IVQT)/8;
6966       Align = llvm::Log2_32(Align);
6967       Result += llvm::utostr(Align); Result += ", ";
6968       CharUnits Size = Context->getTypeSizeInChars(IVQT);
6969       Result += llvm::utostr(Size.getQuantity());
6970       if (i  == e-1)
6971         Result += "}}\n";
6972       else
6973         Result += "},\n";
6974     }
6975     Result += "};\n";
6976   }
6977 }
6978 
6979 /// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
6980 void RewriteModernObjC::RewriteObjCProtocolMetaData(ObjCProtocolDecl *PDecl,
6981                                                     std::string &Result) {
6982 
6983   // Do not synthesize the protocol more than once.
6984   if (ObjCSynthesizedProtocols.count(PDecl->getCanonicalDecl()))
6985     return;
6986   WriteModernMetadataDeclarations(Context, Result);
6987 
6988   if (ObjCProtocolDecl *Def = PDecl->getDefinition())
6989     PDecl = Def;
6990   // Must write out all protocol definitions in current qualifier list,
6991   // and in their nested qualifiers before writing out current definition.
6992   for (auto *I : PDecl->protocols())
6993     RewriteObjCProtocolMetaData(I, Result);
6994 
6995   // Construct method lists.
6996   std::vector<ObjCMethodDecl *> InstanceMethods, ClassMethods;
6997   std::vector<ObjCMethodDecl *> OptInstanceMethods, OptClassMethods;
6998   for (auto *MD : PDecl->instance_methods()) {
6999     if (MD->getImplementationControl() == ObjCMethodDecl::Optional) {
7000       OptInstanceMethods.push_back(MD);
7001     } else {
7002       InstanceMethods.push_back(MD);
7003     }
7004   }
7005 
7006   for (auto *MD : PDecl->class_methods()) {
7007     if (MD->getImplementationControl() == ObjCMethodDecl::Optional) {
7008       OptClassMethods.push_back(MD);
7009     } else {
7010       ClassMethods.push_back(MD);
7011     }
7012   }
7013   std::vector<ObjCMethodDecl *> AllMethods;
7014   for (unsigned i = 0, e = InstanceMethods.size(); i < e; i++)
7015     AllMethods.push_back(InstanceMethods[i]);
7016   for (unsigned i = 0, e = ClassMethods.size(); i < e; i++)
7017     AllMethods.push_back(ClassMethods[i]);
7018   for (unsigned i = 0, e = OptInstanceMethods.size(); i < e; i++)
7019     AllMethods.push_back(OptInstanceMethods[i]);
7020   for (unsigned i = 0, e = OptClassMethods.size(); i < e; i++)
7021     AllMethods.push_back(OptClassMethods[i]);
7022 
7023   Write__extendedMethodTypes_initializer(*this, Context, Result,
7024                                          AllMethods,
7025                                          "_OBJC_PROTOCOL_METHOD_TYPES_",
7026                                          PDecl->getNameAsString());
7027   // Protocol's super protocol list
7028   SmallVector<ObjCProtocolDecl *, 8> SuperProtocols(PDecl->protocols());
7029   Write_protocol_list_initializer(Context, Result, SuperProtocols,
7030                                   "_OBJC_PROTOCOL_REFS_",
7031                                   PDecl->getNameAsString());
7032 
7033   Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
7034                                   "_OBJC_PROTOCOL_INSTANCE_METHODS_",
7035                                   PDecl->getNameAsString(), false);
7036 
7037   Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
7038                                   "_OBJC_PROTOCOL_CLASS_METHODS_",
7039                                   PDecl->getNameAsString(), false);
7040 
7041   Write_method_list_t_initializer(*this, Context, Result, OptInstanceMethods,
7042                                   "_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_",
7043                                   PDecl->getNameAsString(), false);
7044 
7045   Write_method_list_t_initializer(*this, Context, Result, OptClassMethods,
7046                                   "_OBJC_PROTOCOL_OPT_CLASS_METHODS_",
7047                                   PDecl->getNameAsString(), false);
7048 
7049   // Protocol's property metadata.
7050   SmallVector<ObjCPropertyDecl *, 8> ProtocolProperties(PDecl->properties());
7051   Write_prop_list_t_initializer(*this, Context, Result, ProtocolProperties,
7052                                  /* Container */nullptr,
7053                                  "_OBJC_PROTOCOL_PROPERTIES_",
7054                                  PDecl->getNameAsString());
7055 
7056   // Writer out root metadata for current protocol: struct _protocol_t
7057   Result += "\n";
7058   if (LangOpts.MicrosoftExt)
7059     Result += "static ";
7060   Result += "struct _protocol_t _OBJC_PROTOCOL_";
7061   Result += PDecl->getNameAsString();
7062   Result += " __attribute__ ((used, section (\"__DATA,__datacoal_nt,coalesced\"))) = {\n";
7063   Result += "\t0,\n"; // id is; is null
7064   Result += "\t\""; Result += PDecl->getNameAsString(); Result += "\",\n";
7065   if (SuperProtocols.size() > 0) {
7066     Result += "\t(const struct _protocol_list_t *)&"; Result += "_OBJC_PROTOCOL_REFS_";
7067     Result += PDecl->getNameAsString(); Result += ",\n";
7068   }
7069   else
7070     Result += "\t0,\n";
7071   if (InstanceMethods.size() > 0) {
7072     Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
7073     Result += PDecl->getNameAsString(); Result += ",\n";
7074   }
7075   else
7076     Result += "\t0,\n";
7077 
7078   if (ClassMethods.size() > 0) {
7079     Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_CLASS_METHODS_";
7080     Result += PDecl->getNameAsString(); Result += ",\n";
7081   }
7082   else
7083     Result += "\t0,\n";
7084 
7085   if (OptInstanceMethods.size() > 0) {
7086     Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_INSTANCE_METHODS_";
7087     Result += PDecl->getNameAsString(); Result += ",\n";
7088   }
7089   else
7090     Result += "\t0,\n";
7091 
7092   if (OptClassMethods.size() > 0) {
7093     Result += "\t(const struct method_list_t *)&_OBJC_PROTOCOL_OPT_CLASS_METHODS_";
7094     Result += PDecl->getNameAsString(); Result += ",\n";
7095   }
7096   else
7097     Result += "\t0,\n";
7098 
7099   if (ProtocolProperties.size() > 0) {
7100     Result += "\t(const struct _prop_list_t *)&_OBJC_PROTOCOL_PROPERTIES_";
7101     Result += PDecl->getNameAsString(); Result += ",\n";
7102   }
7103   else
7104     Result += "\t0,\n";
7105 
7106   Result += "\t"; Result += "sizeof(_protocol_t)"; Result += ",\n";
7107   Result += "\t0,\n";
7108 
7109   if (AllMethods.size() > 0) {
7110     Result += "\t(const char **)&"; Result += "_OBJC_PROTOCOL_METHOD_TYPES_";
7111     Result += PDecl->getNameAsString();
7112     Result += "\n};\n";
7113   }
7114   else
7115     Result += "\t0\n};\n";
7116 
7117   if (LangOpts.MicrosoftExt)
7118     Result += "static ";
7119   Result += "struct _protocol_t *";
7120   Result += "_OBJC_LABEL_PROTOCOL_$_"; Result += PDecl->getNameAsString();
7121   Result += " = &_OBJC_PROTOCOL_"; Result += PDecl->getNameAsString();
7122   Result += ";\n";
7123 
7124   // Mark this protocol as having been generated.
7125   if (!ObjCSynthesizedProtocols.insert(PDecl->getCanonicalDecl()))
7126     llvm_unreachable("protocol already synthesized");
7127 
7128 }
7129 
7130 void RewriteModernObjC::RewriteObjCProtocolListMetaData(
7131                                 const ObjCList<ObjCProtocolDecl> &Protocols,
7132                                 StringRef prefix, StringRef ClassName,
7133                                 std::string &Result) {
7134   if (Protocols.empty()) return;
7135 
7136   for (unsigned i = 0; i != Protocols.size(); i++)
7137     RewriteObjCProtocolMetaData(Protocols[i], Result);
7138 
7139   // Output the top lovel protocol meta-data for the class.
7140   /* struct _objc_protocol_list {
7141    struct _objc_protocol_list *next;
7142    int    protocol_count;
7143    struct _objc_protocol *class_protocols[];
7144    }
7145    */
7146   Result += "\n";
7147   if (LangOpts.MicrosoftExt)
7148     Result += "__declspec(allocate(\".cat_cls_meth$B\")) ";
7149   Result += "static struct {\n";
7150   Result += "\tstruct _objc_protocol_list *next;\n";
7151   Result += "\tint    protocol_count;\n";
7152   Result += "\tstruct _objc_protocol *class_protocols[";
7153   Result += utostr(Protocols.size());
7154   Result += "];\n} _OBJC_";
7155   Result += prefix;
7156   Result += "_PROTOCOLS_";
7157   Result += ClassName;
7158   Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
7159   "{\n\t0, ";
7160   Result += utostr(Protocols.size());
7161   Result += "\n";
7162 
7163   Result += "\t,{&_OBJC_PROTOCOL_";
7164   Result += Protocols[0]->getNameAsString();
7165   Result += " \n";
7166 
7167   for (unsigned i = 1; i != Protocols.size(); i++) {
7168     Result += "\t ,&_OBJC_PROTOCOL_";
7169     Result += Protocols[i]->getNameAsString();
7170     Result += "\n";
7171   }
7172   Result += "\t }\n};\n";
7173 }
7174 
7175 /// hasObjCExceptionAttribute - Return true if this class or any super
7176 /// class has the __objc_exception__ attribute.
7177 /// FIXME. Move this to ASTContext.cpp as it is also used for IRGen.
7178 static bool hasObjCExceptionAttribute(ASTContext &Context,
7179                                       const ObjCInterfaceDecl *OID) {
7180   if (OID->hasAttr<ObjCExceptionAttr>())
7181     return true;
7182   if (const ObjCInterfaceDecl *Super = OID->getSuperClass())
7183     return hasObjCExceptionAttribute(Context, Super);
7184   return false;
7185 }
7186 
7187 void RewriteModernObjC::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
7188                                            std::string &Result) {
7189   ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
7190 
7191   // Explicitly declared @interface's are already synthesized.
7192   if (CDecl->isImplicitInterfaceDecl())
7193     assert(false &&
7194            "Legacy implicit interface rewriting not supported in moder abi");
7195 
7196   WriteModernMetadataDeclarations(Context, Result);
7197   SmallVector<ObjCIvarDecl *, 8> IVars;
7198 
7199   for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
7200       IVD; IVD = IVD->getNextIvar()) {
7201     // Ignore unnamed bit-fields.
7202     if (!IVD->getDeclName())
7203       continue;
7204     IVars.push_back(IVD);
7205   }
7206 
7207   Write__ivar_list_t_initializer(*this, Context, Result, IVars,
7208                                  "_OBJC_$_INSTANCE_VARIABLES_",
7209                                  CDecl);
7210 
7211   // Build _objc_method_list for class's instance methods if needed
7212   SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
7213 
7214   // If any of our property implementations have associated getters or
7215   // setters, produce metadata for them as well.
7216   for (const auto *Prop : IDecl->property_impls()) {
7217     if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
7218       continue;
7219     if (!Prop->getPropertyIvarDecl())
7220       continue;
7221     ObjCPropertyDecl *PD = Prop->getPropertyDecl();
7222     if (!PD)
7223       continue;
7224     if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
7225       if (mustSynthesizeSetterGetterMethod(IDecl, PD, true /*getter*/))
7226         InstanceMethods.push_back(Getter);
7227     if (PD->isReadOnly())
7228       continue;
7229     if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
7230       if (mustSynthesizeSetterGetterMethod(IDecl, PD, false /*setter*/))
7231         InstanceMethods.push_back(Setter);
7232   }
7233 
7234   Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
7235                                   "_OBJC_$_INSTANCE_METHODS_",
7236                                   IDecl->getNameAsString(), true);
7237 
7238   SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
7239 
7240   Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
7241                                   "_OBJC_$_CLASS_METHODS_",
7242                                   IDecl->getNameAsString(), true);
7243 
7244   // Protocols referenced in class declaration?
7245   // Protocol's super protocol list
7246   std::vector<ObjCProtocolDecl *> RefedProtocols;
7247   const ObjCList<ObjCProtocolDecl> &Protocols = CDecl->getReferencedProtocols();
7248   for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
7249        E = Protocols.end();
7250        I != E; ++I) {
7251     RefedProtocols.push_back(*I);
7252     // Must write out all protocol definitions in current qualifier list,
7253     // and in their nested qualifiers before writing out current definition.
7254     RewriteObjCProtocolMetaData(*I, Result);
7255   }
7256 
7257   Write_protocol_list_initializer(Context, Result,
7258                                   RefedProtocols,
7259                                   "_OBJC_CLASS_PROTOCOLS_$_",
7260                                   IDecl->getNameAsString());
7261 
7262   // Protocol's property metadata.
7263   SmallVector<ObjCPropertyDecl *, 8> ClassProperties(CDecl->properties());
7264   Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
7265                                  /* Container */IDecl,
7266                                  "_OBJC_$_PROP_LIST_",
7267                                  CDecl->getNameAsString());
7268 
7269 
7270   // Data for initializing _class_ro_t  metaclass meta-data
7271   uint32_t flags = CLS_META;
7272   std::string InstanceSize;
7273   std::string InstanceStart;
7274 
7275 
7276   bool classIsHidden = CDecl->getVisibility() == HiddenVisibility;
7277   if (classIsHidden)
7278     flags |= OBJC2_CLS_HIDDEN;
7279 
7280   if (!CDecl->getSuperClass())
7281     // class is root
7282     flags |= CLS_ROOT;
7283   InstanceSize = "sizeof(struct _class_t)";
7284   InstanceStart = InstanceSize;
7285   Write__class_ro_t_initializer(Context, Result, flags,
7286                                 InstanceStart, InstanceSize,
7287                                 ClassMethods,
7288                                 nullptr,
7289                                 nullptr,
7290                                 nullptr,
7291                                 "_OBJC_METACLASS_RO_$_",
7292                                 CDecl->getNameAsString());
7293 
7294   // Data for initializing _class_ro_t meta-data
7295   flags = CLS;
7296   if (classIsHidden)
7297     flags |= OBJC2_CLS_HIDDEN;
7298 
7299   if (hasObjCExceptionAttribute(*Context, CDecl))
7300     flags |= CLS_EXCEPTION;
7301 
7302   if (!CDecl->getSuperClass())
7303     // class is root
7304     flags |= CLS_ROOT;
7305 
7306   InstanceSize.clear();
7307   InstanceStart.clear();
7308   if (!ObjCSynthesizedStructs.count(CDecl)) {
7309     InstanceSize = "0";
7310     InstanceStart = "0";
7311   }
7312   else {
7313     InstanceSize = "sizeof(struct ";
7314     InstanceSize += CDecl->getNameAsString();
7315     InstanceSize += "_IMPL)";
7316 
7317     ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
7318     if (IVD) {
7319       RewriteIvarOffsetComputation(IVD, InstanceStart);
7320     }
7321     else
7322       InstanceStart = InstanceSize;
7323   }
7324   Write__class_ro_t_initializer(Context, Result, flags,
7325                                 InstanceStart, InstanceSize,
7326                                 InstanceMethods,
7327                                 RefedProtocols,
7328                                 IVars,
7329                                 ClassProperties,
7330                                 "_OBJC_CLASS_RO_$_",
7331                                 CDecl->getNameAsString());
7332 
7333   Write_class_t(Context, Result,
7334                 "OBJC_METACLASS_$_",
7335                 CDecl, /*metaclass*/true);
7336 
7337   Write_class_t(Context, Result,
7338                 "OBJC_CLASS_$_",
7339                 CDecl, /*metaclass*/false);
7340 
7341   if (ImplementationIsNonLazy(IDecl))
7342     DefinedNonLazyClasses.push_back(CDecl);
7343 
7344 }
7345 
7346 void RewriteModernObjC::RewriteClassSetupInitHook(std::string &Result) {
7347   int ClsDefCount = ClassImplementation.size();
7348   if (!ClsDefCount)
7349     return;
7350   Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
7351   Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
7352   Result += "static void *OBJC_CLASS_SETUP[] = {\n";
7353   for (int i = 0; i < ClsDefCount; i++) {
7354     ObjCImplementationDecl *IDecl = ClassImplementation[i];
7355     ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
7356     Result += "\t(void *)&OBJC_CLASS_SETUP_$_";
7357     Result  += CDecl->getName(); Result += ",\n";
7358   }
7359   Result += "};\n";
7360 }
7361 
7362 void RewriteModernObjC::RewriteMetaDataIntoBuffer(std::string &Result) {
7363   int ClsDefCount = ClassImplementation.size();
7364   int CatDefCount = CategoryImplementation.size();
7365 
7366   // For each implemented class, write out all its meta data.
7367   for (int i = 0; i < ClsDefCount; i++)
7368     RewriteObjCClassMetaData(ClassImplementation[i], Result);
7369 
7370   RewriteClassSetupInitHook(Result);
7371 
7372   // For each implemented category, write out all its meta data.
7373   for (int i = 0; i < CatDefCount; i++)
7374     RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
7375 
7376   RewriteCategorySetupInitHook(Result);
7377 
7378   if (ClsDefCount > 0) {
7379     if (LangOpts.MicrosoftExt)
7380       Result += "__declspec(allocate(\".objc_classlist$B\")) ";
7381     Result += "static struct _class_t *L_OBJC_LABEL_CLASS_$ [";
7382     Result += llvm::utostr(ClsDefCount); Result += "]";
7383     Result +=
7384       " __attribute__((used, section (\"__DATA, __objc_classlist,"
7385       "regular,no_dead_strip\")))= {\n";
7386     for (int i = 0; i < ClsDefCount; i++) {
7387       Result += "\t&OBJC_CLASS_$_";
7388       Result += ClassImplementation[i]->getNameAsString();
7389       Result += ",\n";
7390     }
7391     Result += "};\n";
7392 
7393     if (!DefinedNonLazyClasses.empty()) {
7394       if (LangOpts.MicrosoftExt)
7395         Result += "__declspec(allocate(\".objc_nlclslist$B\")) \n";
7396       Result += "static struct _class_t *_OBJC_LABEL_NONLAZY_CLASS_$[] = {\n\t";
7397       for (unsigned i = 0, e = DefinedNonLazyClasses.size(); i < e; i++) {
7398         Result += "\t&OBJC_CLASS_$_"; Result += DefinedNonLazyClasses[i]->getNameAsString();
7399         Result += ",\n";
7400       }
7401       Result += "};\n";
7402     }
7403   }
7404 
7405   if (CatDefCount > 0) {
7406     if (LangOpts.MicrosoftExt)
7407       Result += "__declspec(allocate(\".objc_catlist$B\")) ";
7408     Result += "static struct _category_t *L_OBJC_LABEL_CATEGORY_$ [";
7409     Result += llvm::utostr(CatDefCount); Result += "]";
7410     Result +=
7411     " __attribute__((used, section (\"__DATA, __objc_catlist,"
7412     "regular,no_dead_strip\")))= {\n";
7413     for (int i = 0; i < CatDefCount; i++) {
7414       Result += "\t&_OBJC_$_CATEGORY_";
7415       Result +=
7416         CategoryImplementation[i]->getClassInterface()->getNameAsString();
7417       Result += "_$_";
7418       Result += CategoryImplementation[i]->getNameAsString();
7419       Result += ",\n";
7420     }
7421     Result += "};\n";
7422   }
7423 
7424   if (!DefinedNonLazyCategories.empty()) {
7425     if (LangOpts.MicrosoftExt)
7426       Result += "__declspec(allocate(\".objc_nlcatlist$B\")) \n";
7427     Result += "static struct _category_t *_OBJC_LABEL_NONLAZY_CATEGORY_$[] = {\n\t";
7428     for (unsigned i = 0, e = DefinedNonLazyCategories.size(); i < e; i++) {
7429       Result += "\t&_OBJC_$_CATEGORY_";
7430       Result +=
7431         DefinedNonLazyCategories[i]->getClassInterface()->getNameAsString();
7432       Result += "_$_";
7433       Result += DefinedNonLazyCategories[i]->getNameAsString();
7434       Result += ",\n";
7435     }
7436     Result += "};\n";
7437   }
7438 }
7439 
7440 void RewriteModernObjC::WriteImageInfo(std::string &Result) {
7441   if (LangOpts.MicrosoftExt)
7442     Result += "__declspec(allocate(\".objc_imageinfo$B\")) \n";
7443 
7444   Result += "static struct IMAGE_INFO { unsigned version; unsigned flag; } ";
7445   // version 0, ObjCABI is 2
7446   Result += "_OBJC_IMAGE_INFO = { 0, 2 };\n";
7447 }
7448 
7449 /// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
7450 /// implementation.
7451 void RewriteModernObjC::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
7452                                               std::string &Result) {
7453   WriteModernMetadataDeclarations(Context, Result);
7454   ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
7455   // Find category declaration for this implementation.
7456   ObjCCategoryDecl *CDecl
7457     = ClassDecl->FindCategoryDeclaration(IDecl->getIdentifier());
7458 
7459   std::string FullCategoryName = ClassDecl->getNameAsString();
7460   FullCategoryName += "_$_";
7461   FullCategoryName += CDecl->getNameAsString();
7462 
7463   // Build _objc_method_list for class's instance methods if needed
7464   SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
7465 
7466   // If any of our property implementations have associated getters or
7467   // setters, produce metadata for them as well.
7468   for (const auto *Prop : IDecl->property_impls()) {
7469     if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
7470       continue;
7471     if (!Prop->getPropertyIvarDecl())
7472       continue;
7473     ObjCPropertyDecl *PD = Prop->getPropertyDecl();
7474     if (!PD)
7475       continue;
7476     if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
7477       InstanceMethods.push_back(Getter);
7478     if (PD->isReadOnly())
7479       continue;
7480     if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
7481       InstanceMethods.push_back(Setter);
7482   }
7483 
7484   Write_method_list_t_initializer(*this, Context, Result, InstanceMethods,
7485                                   "_OBJC_$_CATEGORY_INSTANCE_METHODS_",
7486                                   FullCategoryName, true);
7487 
7488   SmallVector<ObjCMethodDecl *, 32> ClassMethods(IDecl->class_methods());
7489 
7490   Write_method_list_t_initializer(*this, Context, Result, ClassMethods,
7491                                   "_OBJC_$_CATEGORY_CLASS_METHODS_",
7492                                   FullCategoryName, true);
7493 
7494   // Protocols referenced in class declaration?
7495   // Protocol's super protocol list
7496   SmallVector<ObjCProtocolDecl *, 8> RefedProtocols(CDecl->protocols());
7497   for (auto *I : CDecl->protocols())
7498     // Must write out all protocol definitions in current qualifier list,
7499     // and in their nested qualifiers before writing out current definition.
7500     RewriteObjCProtocolMetaData(I, Result);
7501 
7502   Write_protocol_list_initializer(Context, Result,
7503                                   RefedProtocols,
7504                                   "_OBJC_CATEGORY_PROTOCOLS_$_",
7505                                   FullCategoryName);
7506 
7507   // Protocol's property metadata.
7508   SmallVector<ObjCPropertyDecl *, 8> ClassProperties(CDecl->properties());
7509   Write_prop_list_t_initializer(*this, Context, Result, ClassProperties,
7510                                 /* Container */IDecl,
7511                                 "_OBJC_$_PROP_LIST_",
7512                                 FullCategoryName);
7513 
7514   Write_category_t(*this, Context, Result,
7515                    CDecl,
7516                    ClassDecl,
7517                    InstanceMethods,
7518                    ClassMethods,
7519                    RefedProtocols,
7520                    ClassProperties);
7521 
7522   // Determine if this category is also "non-lazy".
7523   if (ImplementationIsNonLazy(IDecl))
7524     DefinedNonLazyCategories.push_back(CDecl);
7525 
7526 }
7527 
7528 void RewriteModernObjC::RewriteCategorySetupInitHook(std::string &Result) {
7529   int CatDefCount = CategoryImplementation.size();
7530   if (!CatDefCount)
7531     return;
7532   Result += "#pragma section(\".objc_inithooks$B\", long, read, write)\n";
7533   Result += "__declspec(allocate(\".objc_inithooks$B\")) ";
7534   Result += "static void *OBJC_CATEGORY_SETUP[] = {\n";
7535   for (int i = 0; i < CatDefCount; i++) {
7536     ObjCCategoryImplDecl *IDecl = CategoryImplementation[i];
7537     ObjCCategoryDecl *CatDecl= IDecl->getCategoryDecl();
7538     ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
7539     Result += "\t(void *)&OBJC_CATEGORY_SETUP_$_";
7540     Result += ClassDecl->getName();
7541     Result += "_$_";
7542     Result += CatDecl->getName();
7543     Result += ",\n";
7544   }
7545   Result += "};\n";
7546 }
7547 
7548 // RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
7549 /// class methods.
7550 template<typename MethodIterator>
7551 void RewriteModernObjC::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
7552                                              MethodIterator MethodEnd,
7553                                              bool IsInstanceMethod,
7554                                              StringRef prefix,
7555                                              StringRef ClassName,
7556                                              std::string &Result) {
7557   if (MethodBegin == MethodEnd) return;
7558 
7559   if (!objc_impl_method) {
7560     /* struct _objc_method {
7561      SEL _cmd;
7562      char *method_types;
7563      void *_imp;
7564      }
7565      */
7566     Result += "\nstruct _objc_method {\n";
7567     Result += "\tSEL _cmd;\n";
7568     Result += "\tchar *method_types;\n";
7569     Result += "\tvoid *_imp;\n";
7570     Result += "};\n";
7571 
7572     objc_impl_method = true;
7573   }
7574 
7575   // Build _objc_method_list for class's methods if needed
7576 
7577   /* struct  {
7578    struct _objc_method_list *next_method;
7579    int method_count;
7580    struct _objc_method method_list[];
7581    }
7582    */
7583   unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
7584   Result += "\n";
7585   if (LangOpts.MicrosoftExt) {
7586     if (IsInstanceMethod)
7587       Result += "__declspec(allocate(\".inst_meth$B\")) ";
7588     else
7589       Result += "__declspec(allocate(\".cls_meth$B\")) ";
7590   }
7591   Result += "static struct {\n";
7592   Result += "\tstruct _objc_method_list *next_method;\n";
7593   Result += "\tint method_count;\n";
7594   Result += "\tstruct _objc_method method_list[";
7595   Result += utostr(NumMethods);
7596   Result += "];\n} _OBJC_";
7597   Result += prefix;
7598   Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
7599   Result += "_METHODS_";
7600   Result += ClassName;
7601   Result += " __attribute__ ((used, section (\"__OBJC, __";
7602   Result += IsInstanceMethod ? "inst" : "cls";
7603   Result += "_meth\")))= ";
7604   Result += "{\n\t0, " + utostr(NumMethods) + "\n";
7605 
7606   Result += "\t,{{(SEL)\"";
7607   Result += (*MethodBegin)->getSelector().getAsString().c_str();
7608   std::string MethodTypeString;
7609   Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
7610   Result += "\", \"";
7611   Result += MethodTypeString;
7612   Result += "\", (void *)";
7613   Result += MethodInternalNames[*MethodBegin];
7614   Result += "}\n";
7615   for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
7616     Result += "\t  ,{(SEL)\"";
7617     Result += (*MethodBegin)->getSelector().getAsString().c_str();
7618     std::string MethodTypeString;
7619     Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
7620     Result += "\", \"";
7621     Result += MethodTypeString;
7622     Result += "\", (void *)";
7623     Result += MethodInternalNames[*MethodBegin];
7624     Result += "}\n";
7625   }
7626   Result += "\t }\n};\n";
7627 }
7628 
7629 Stmt *RewriteModernObjC::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) {
7630   SourceRange OldRange = IV->getSourceRange();
7631   Expr *BaseExpr = IV->getBase();
7632 
7633   // Rewrite the base, but without actually doing replaces.
7634   {
7635     DisableReplaceStmtScope S(*this);
7636     BaseExpr = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(BaseExpr));
7637     IV->setBase(BaseExpr);
7638   }
7639 
7640   ObjCIvarDecl *D = IV->getDecl();
7641 
7642   Expr *Replacement = IV;
7643 
7644     if (BaseExpr->getType()->isObjCObjectPointerType()) {
7645       const ObjCInterfaceType *iFaceDecl =
7646         dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
7647       assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
7648       // lookup which class implements the instance variable.
7649       ObjCInterfaceDecl *clsDeclared = nullptr;
7650       iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
7651                                                    clsDeclared);
7652       assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
7653 
7654       // Build name of symbol holding ivar offset.
7655       std::string IvarOffsetName;
7656       if (D->isBitField())
7657         ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
7658       else
7659         WriteInternalIvarName(clsDeclared, D, IvarOffsetName);
7660 
7661       ReferencedIvars[clsDeclared].insert(D);
7662 
7663       // cast offset to "char *".
7664       CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context,
7665                                                     Context->getPointerType(Context->CharTy),
7666                                                     CK_BitCast,
7667                                                     BaseExpr);
7668       VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
7669                                        SourceLocation(), &Context->Idents.get(IvarOffsetName),
7670                                        Context->UnsignedLongTy, nullptr,
7671                                        SC_Extern);
7672       DeclRefExpr *DRE = new (Context) DeclRefExpr(NewVD, false,
7673                                                    Context->UnsignedLongTy, VK_LValue,
7674                                                    SourceLocation());
7675       BinaryOperator *addExpr =
7676         new (Context) BinaryOperator(castExpr, DRE, BO_Add,
7677                                      Context->getPointerType(Context->CharTy),
7678                                      VK_RValue, OK_Ordinary, SourceLocation(), false);
7679       // Don't forget the parens to enforce the proper binding.
7680       ParenExpr *PE = new (Context) ParenExpr(SourceLocation(),
7681                                               SourceLocation(),
7682                                               addExpr);
7683       QualType IvarT = D->getType();
7684       if (D->isBitField())
7685         IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
7686 
7687       if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
7688         RecordDecl *RD = IvarT->getAs<RecordType>()->getDecl();
7689         RD = RD->getDefinition();
7690         if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
7691           // decltype(((Foo_IMPL*)0)->bar) *
7692           ObjCContainerDecl *CDecl =
7693             dyn_cast<ObjCContainerDecl>(D->getDeclContext());
7694           // ivar in class extensions requires special treatment.
7695           if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
7696             CDecl = CatDecl->getClassInterface();
7697           std::string RecName = CDecl->getName();
7698           RecName += "_IMPL";
7699           RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
7700                                               SourceLocation(), SourceLocation(),
7701                                               &Context->Idents.get(RecName.c_str()));
7702           QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
7703           unsigned UnsignedIntSize =
7704             static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
7705           Expr *Zero = IntegerLiteral::Create(*Context,
7706                                               llvm::APInt(UnsignedIntSize, 0),
7707                                               Context->UnsignedIntTy, SourceLocation());
7708           Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
7709           ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
7710                                                   Zero);
7711           FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
7712                                             SourceLocation(),
7713                                             &Context->Idents.get(D->getNameAsString()),
7714                                             IvarT, nullptr,
7715                                             /*BitWidth=*/nullptr,
7716                                             /*Mutable=*/true, ICIS_NoInit);
7717           MemberExpr *ME = new (Context) MemberExpr(PE, true, FD, SourceLocation(),
7718                                                     FD->getType(), VK_LValue,
7719                                                     OK_Ordinary);
7720           IvarT = Context->getDecltypeType(ME, ME->getType());
7721         }
7722       }
7723       convertObjCTypeToCStyleType(IvarT);
7724       QualType castT = Context->getPointerType(IvarT);
7725 
7726       castExpr = NoTypeInfoCStyleCastExpr(Context,
7727                                           castT,
7728                                           CK_BitCast,
7729                                           PE);
7730 
7731 
7732       Expr *Exp = new (Context) UnaryOperator(castExpr, UO_Deref, IvarT,
7733                                               VK_LValue, OK_Ordinary,
7734                                               SourceLocation());
7735       PE = new (Context) ParenExpr(OldRange.getBegin(),
7736                                    OldRange.getEnd(),
7737                                    Exp);
7738 
7739       if (D->isBitField()) {
7740         FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
7741                                           SourceLocation(),
7742                                           &Context->Idents.get(D->getNameAsString()),
7743                                           D->getType(), nullptr,
7744                                           /*BitWidth=*/D->getBitWidth(),
7745                                           /*Mutable=*/true, ICIS_NoInit);
7746         MemberExpr *ME = new (Context) MemberExpr(PE, /*isArrow*/false, FD, SourceLocation(),
7747                                                   FD->getType(), VK_LValue,
7748                                                   OK_Ordinary);
7749         Replacement = ME;
7750 
7751       }
7752       else
7753         Replacement = PE;
7754     }
7755 
7756     ReplaceStmtWithRange(IV, Replacement, OldRange);
7757     return Replacement;
7758 }
7759 
7760 #endif
7761