clang  13.0.0git
RewriteModernObjC.cpp
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1 //===-- RewriteModernObjC.cpp - Playground for the code rewriter ----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Hacks and fun related to the code rewriter.
10 //
11 //===----------------------------------------------------------------------===//
12 
14 #include "clang/AST/AST.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/Attr.h"
17 #include "clang/AST/ParentMap.h"
18 #include "clang/Basic/CharInfo.h"
19 #include "clang/Basic/Diagnostic.h"
22 #include "clang/Basic/TargetInfo.h"
23 #include "clang/Config/config.h"
24 #include "clang/Lex/Lexer.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 #if 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 */
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 
65  DiagnosticsEngine &Diags;
66  const LangOptions &LangOpts;
67  ASTContext *Context;
69  TranslationUnitDecl *TUDecl;
70  FileID MainFileID;
71  const char *MainFileStart, *MainFileEnd;
72  Stmt *CurrentBody;
73  ParentMap *PropParentMap; // created lazily.
74  std::string InFileName;
75  std::unique_ptr<raw_ostream> OutFile;
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 
125  SmallVector<int, 8> ObjCBcLabelNo;
126  // Remember all the @protocol(<expr>) expressions.
128 
129  llvm::DenseSet<uint64_t> CopyDestroyCache;
130 
131  // Block expressions.
133  SmallVector<int, 32> InnerDeclRefsCount;
134  SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
135 
136  SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
137 
138  // Block related declarations.
139  SmallVector<ValueDecl *, 8> BlockByCopyDecls;
140  llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
141  SmallVector<ValueDecl *, 8> BlockByRefDecls;
142  llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
143  llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
144  llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
145  llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
146 
147  llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
148  llvm::DenseMap<ObjCInterfaceDecl *,
149  llvm::SmallSetVector<ObjCIvarDecl *, 8> > ReferencedIvars;
150 
151  // ivar bitfield grouping containers
152  llvm::DenseSet<const ObjCInterfaceDecl *> ObjCInterefaceHasBitfieldGroups;
153  llvm::DenseMap<const ObjCIvarDecl* , unsigned> IvarGroupNumber;
154  // This container maps an <class, group number for ivar> tuple to the type
155  // of the struct where the bitfield belongs.
156  llvm::DenseMap<std::pair<const ObjCInterfaceDecl*, unsigned>, QualType> GroupRecordType;
157  SmallVector<FunctionDecl*, 32> FunctionDefinitionsSeen;
158 
159  // This maps an original source AST to it's rewritten form. This allows
160  // us to avoid rewriting the same node twice (which is very uncommon).
161  // This is needed to support some of the exotic property rewriting.
162  llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
163 
164  // Needed for header files being rewritten
165  bool IsHeader;
166  bool SilenceRewriteMacroWarning;
167  bool GenerateLineInfo;
168  bool objc_impl_method;
169 
170  bool DisableReplaceStmt;
171  class DisableReplaceStmtScope {
172  RewriteModernObjC &R;
173  bool SavedValue;
174 
175  public:
176  DisableReplaceStmtScope(RewriteModernObjC &R)
177  : R(R), SavedValue(R.DisableReplaceStmt) {
178  R.DisableReplaceStmt = true;
179  }
180  ~DisableReplaceStmtScope() {
181  R.DisableReplaceStmt = SavedValue;
182  }
183  };
184  void InitializeCommon(ASTContext &context);
185 
186  public:
187  llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
188 
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  }
239 
240  void HandleTopLevelSingleDecl(Decl *D);
241  void HandleDeclInMainFile(Decl *D);
242  RewriteModernObjC(std::string inFile, std::unique_ptr<raw_ostream> OS,
243  DiagnosticsEngine &D, const LangOptions &LOpts,
244  bool silenceMacroWarn, bool LineInfo);
245 
246  ~RewriteModernObjC() override {}
247 
248  void HandleTranslationUnit(ASTContext &C) override;
249 
250  void ReplaceStmt(Stmt *Old, Stmt *New) {
251  ReplaceStmtWithRange(Old, New, Old->getSourceRange());
252  }
253 
254  void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
255  assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
256 
257  Stmt *ReplacingStmt = ReplacedNodes[Old];
258  if (ReplacingStmt)
259  return; // We can't rewrite the same node twice.
260 
261  if (DisableReplaceStmt)
262  return;
263 
264  // Measure the old text.
265  int Size = Rewrite.getRangeSize(SrcRange);
266  if (Size == -1) {
267  Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
268  << Old->getSourceRange();
269  return;
270  }
271  // Get the new text.
272  std::string SStr;
273  llvm::raw_string_ostream S(SStr);
274  New->printPretty(S, nullptr, PrintingPolicy(LangOpts));
275  const std::string &Str = S.str();
276 
277  // If replacement succeeded or warning disabled return with no warning.
278  if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
279  ReplacedNodes[Old] = New;
280  return;
281  }
282  if (SilenceRewriteMacroWarning)
283  return;
284  Diags.Report(Context->getFullLoc(Old->getBeginLoc()), RewriteFailedDiag)
285  << Old->getSourceRange();
286  }
287 
288  void InsertText(SourceLocation Loc, StringRef Str,
289  bool InsertAfter = true) {
290  // If insertion succeeded or warning disabled return with no warning.
291  if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
292  SilenceRewriteMacroWarning)
293  return;
294 
295  Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
296  }
297 
298  void ReplaceText(SourceLocation Start, unsigned OrigLength,
299  StringRef Str) {
300  // If removal succeeded or warning disabled return with no warning.
301  if (!Rewrite.ReplaceText(Start, OrigLength, Str) ||
302  SilenceRewriteMacroWarning)
303  return;
304 
305  Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
306  }
307 
308  // Syntactic Rewriting.
309  void RewriteRecordBody(RecordDecl *RD);
310  void RewriteInclude();
311  void RewriteLineDirective(const Decl *D);
312  void ConvertSourceLocationToLineDirective(SourceLocation Loc,
313  std::string &LineString);
314  void RewriteForwardClassDecl(DeclGroupRef D);
315  void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
316  void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
317  const std::string &typedefString);
318  void RewriteImplementations();
319  void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
321  ObjCCategoryImplDecl *CID);
322  void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
323  void RewriteImplementationDecl(Decl *Dcl);
324  void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
325  ObjCMethodDecl *MDecl, std::string &ResultStr);
326  void RewriteTypeIntoString(QualType T, std::string &ResultStr,
327  const FunctionType *&FPRetType);
328  void RewriteByRefString(std::string &ResultStr, const std::string &Name,
329  ValueDecl *VD, bool def=false);
330  void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
331  void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
332  void RewriteForwardProtocolDecl(DeclGroupRef D);
333  void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
334  void RewriteMethodDeclaration(ObjCMethodDecl *Method);
335  void RewriteProperty(ObjCPropertyDecl *prop);
336  void RewriteFunctionDecl(FunctionDecl *FD);
337  void RewriteBlockPointerType(std::string& Str, QualType Type);
338  void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
339  void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
340  void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
341  void RewriteTypeOfDecl(VarDecl *VD);
342  void RewriteObjCQualifiedInterfaceTypes(Expr *E);
343 
345 
346  // Expression Rewriting.
347  Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
348  Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
349  Stmt *RewritePropertyOrImplicitGetter(PseudoObjectExpr *Pseudo);
350  Stmt *RewritePropertyOrImplicitSetter(PseudoObjectExpr *Pseudo);
351  Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
352  Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
353  Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
354  Stmt *RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp);
355  Stmt *RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp);
356  Stmt *RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp);
357  Stmt *RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp);
358  Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
359  Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
360  Stmt *RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S);
361  Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
362  Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
363  Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
364  SourceLocation OrigEnd);
365  Stmt *RewriteBreakStmt(BreakStmt *S);
366  Stmt *RewriteContinueStmt(ContinueStmt *S);
367  void RewriteCastExpr(CStyleCastExpr *CE);
368  void RewriteImplicitCastObjCExpr(CastExpr *IE);
369 
370  // Computes ivar bitfield group no.
371  unsigned ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV);
372  // Names field decl. for ivar bitfield group.
373  void ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV, std::string &Result);
374  // Names struct type for ivar bitfield group.
375  void ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV, std::string &Result);
376  // Names symbol for ivar bitfield group field offset.
377  void ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV, std::string &Result);
378  // Given an ivar bitfield, it builds (or finds) its group record type.
379  QualType GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV);
380  QualType SynthesizeBitfieldGroupStructType(
381  ObjCIvarDecl *IV,
383 
384  // Block rewriting.
385  void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
386 
387  // Block specific rewrite rules.
388  void RewriteBlockPointerDecl(NamedDecl *VD);
389  void RewriteByRefVar(VarDecl *VD, bool firstDecl, bool lastDecl);
390  Stmt *RewriteBlockDeclRefExpr(DeclRefExpr *VD);
391  Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
392  void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
393 
394  void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
395  std::string &Result);
396 
397  void RewriteObjCFieldDecl(FieldDecl *fieldDecl, std::string &Result);
398  bool IsTagDefinedInsideClass(ObjCContainerDecl *IDecl, TagDecl *Tag,
399  bool &IsNamedDefinition);
400  void RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
401  std::string &Result);
402 
403  bool RewriteObjCFieldDeclType(QualType &Type, std::string &Result);
404 
405  void RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
406  std::string &Result);
407 
408  void Initialize(ASTContext &context) override;
409 
410  // Misc. AST transformation routines. Sometimes they end up calling
411  // rewriting routines on the new ASTs.
412  CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
413  ArrayRef<Expr *> Args,
414  SourceLocation StartLoc=SourceLocation(),
415  SourceLocation EndLoc=SourceLocation());
416 
417  Expr *SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
418  QualType returnType,
419  SmallVectorImpl<QualType> &ArgTypes,
420  SmallVectorImpl<Expr*> &MsgExprs,
421  ObjCMethodDecl *Method);
422 
423  Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
424  SourceLocation StartLoc=SourceLocation(),
425  SourceLocation EndLoc=SourceLocation());
426 
427  void SynthCountByEnumWithState(std::string &buf);
428  void SynthMsgSendFunctionDecl();
429  void SynthMsgSendSuperFunctionDecl();
430  void SynthMsgSendStretFunctionDecl();
431  void SynthMsgSendFpretFunctionDecl();
432  void SynthMsgSendSuperStretFunctionDecl();
433  void SynthGetClassFunctionDecl();
434  void SynthGetMetaClassFunctionDecl();
435  void SynthGetSuperClassFunctionDecl();
436  void SynthSelGetUidFunctionDecl();
437  void SynthSuperConstructorFunctionDecl();
438 
439  // Rewriting metadata
440  template<typename MethodIterator>
441  void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
442  MethodIterator MethodEnd,
443  bool IsInstanceMethod,
444  StringRef prefix,
445  StringRef ClassName,
446  std::string &Result);
447  void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
448  std::string &Result);
449  void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
450  std::string &Result);
451  void RewriteClassSetupInitHook(std::string &Result);
452 
453  void RewriteMetaDataIntoBuffer(std::string &Result);
454  void WriteImageInfo(std::string &Result);
455  void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
456  std::string &Result);
457  void RewriteCategorySetupInitHook(std::string &Result);
458 
459  // Rewriting ivar
460  void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
461  std::string &Result);
462  Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV);
463 
464 
465  std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
466  std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
467  StringRef funcName, std::string Tag);
468  std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
469  StringRef funcName, std::string Tag);
470  std::string SynthesizeBlockImpl(BlockExpr *CE,
471  std::string Tag, std::string Desc);
472  std::string SynthesizeBlockDescriptor(std::string DescTag,
473  std::string ImplTag,
474  int i, StringRef funcName,
475  unsigned hasCopy);
476  Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
477  void SynthesizeBlockLiterals(SourceLocation FunLocStart,
478  StringRef FunName);
479  FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
480  Stmt *SynthBlockInitExpr(BlockExpr *Exp,
481  const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
482 
483  // Misc. helper routines.
484  QualType getProtocolType();
485  void WarnAboutReturnGotoStmts(Stmt *S);
486  void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
487  void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
488  void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
489 
490  bool IsDeclStmtInForeachHeader(DeclStmt *DS);
491  void CollectBlockDeclRefInfo(BlockExpr *Exp);
492  void GetBlockDeclRefExprs(Stmt *S);
493  void GetInnerBlockDeclRefExprs(Stmt *S,
494  SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
495  llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts);
496 
497  // We avoid calling Type::isBlockPointerType(), since it operates on the
498  // canonical type. We only care if the top-level type is a closure pointer.
499  bool isTopLevelBlockPointerType(QualType T) {
500  return isa<BlockPointerType>(T);
501  }
502 
503  /// convertBlockPointerToFunctionPointer - Converts a block-pointer type
504  /// to a function pointer type and upon success, returns true; false
505  /// otherwise.
506  bool convertBlockPointerToFunctionPointer(QualType &T) {
507  if (isTopLevelBlockPointerType(T)) {
508  const auto *BPT = T->castAs<BlockPointerType>();
509  T = Context->getPointerType(BPT->getPointeeType());
510  return true;
511  }
512  return false;
513  }
514 
515  bool convertObjCTypeToCStyleType(QualType &T);
516 
517  bool needToScanForQualifiers(QualType T);
518  QualType getSuperStructType();
519  QualType getConstantStringStructType();
520  QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
521 
522  void convertToUnqualifiedObjCType(QualType &T) {
523  if (T->isObjCQualifiedIdType()) {
524  bool isConst = T.isConstQualified();
525  T = isConst ? Context->getObjCIdType().withConst()
526  : Context->getObjCIdType();
527  }
528  else if (T->isObjCQualifiedClassType())
529  T = Context->getObjCClassType();
530  else if (T->isObjCObjectPointerType() &&
532  if (const ObjCObjectPointerType * OBJPT =
534  const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
535  T = QualType(IFaceT, 0);
536  T = Context->getPointerType(T);
537  }
538  }
539  }
540 
541  // FIXME: This predicate seems like it would be useful to add to ASTContext.
542  bool isObjCType(QualType T) {
543  if (!LangOpts.ObjC)
544  return false;
545 
546  QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
547 
548  if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
549  OCT == Context->getCanonicalType(Context->getObjCClassType()))
550  return true;
551 
552  if (const PointerType *PT = OCT->getAs<PointerType>()) {
553  if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
554  PT->getPointeeType()->isObjCQualifiedIdType())
555  return true;
556  }
557  return false;
558  }
559 
560  bool PointerTypeTakesAnyBlockArguments(QualType QT);
561  bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
562  void GetExtentOfArgList(const char *Name, const char *&LParen,
563  const char *&RParen);
564 
565  void QuoteDoublequotes(std::string &From, std::string &To) {
566  for (unsigned i = 0; i < From.length(); i++) {
567  if (From[i] == '"')
568  To += "\\\"";
569  else
570  To += From[i];
571  }
572  }
573 
574  QualType getSimpleFunctionType(QualType result,
575  ArrayRef<QualType> args,
576  bool variadic = false) {
577  if (result == Context->getObjCInstanceType())
578  result = Context->getObjCIdType();
580  fpi.Variadic = variadic;
581  return Context->getFunctionType(result, args, fpi);
582  }
583 
584  // Helper function: create a CStyleCastExpr with trivial type source info.
585  CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
586  CastKind Kind, Expr *E) {
588  return CStyleCastExpr::Create(*Ctx, Ty, VK_RValue, Kind, E, nullptr,
589  FPOptionsOverride(), TInfo,
591  }
592 
593  bool ImplementationIsNonLazy(const ObjCImplDecl *OD) const {
594  IdentifierInfo* II = &Context->Idents.get("load");
595  Selector LoadSel = Context->Selectors.getSelector(0, &II);
596  return OD->getClassMethod(LoadSel) != nullptr;
597  }
598 
599  StringLiteral *getStringLiteral(StringRef Str) {
600  QualType StrType = Context->getConstantArrayType(
601  Context->CharTy, llvm::APInt(32, Str.size() + 1), nullptr,
602  ArrayType::Normal, 0);
603  return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
604  /*Pascal=*/false, StrType, SourceLocation());
605  }
606  };
607 } // end anonymous namespace
608 
609 void RewriteModernObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
610  NamedDecl *D) {
611  if (const FunctionProtoType *fproto
612  = dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
613  for (const auto &I : fproto->param_types())
614  if (isTopLevelBlockPointerType(I)) {
615  // All the args are checked/rewritten. Don't call twice!
616  RewriteBlockPointerDecl(D);
617  break;
618  }
619  }
620 }
621 
622 void RewriteModernObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
623  const PointerType *PT = funcType->getAs<PointerType>();
624  if (PT && PointerTypeTakesAnyBlockArguments(funcType))
625  RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
626 }
627 
628 static bool IsHeaderFile(const std::string &Filename) {
629  std::string::size_type DotPos = Filename.rfind('.');
630 
631  if (DotPos == std::string::npos) {
632  // no file extension
633  return false;
634  }
635 
636  std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
637  // C header: .h
638  // C++ header: .hh or .H;
639  return Ext == "h" || Ext == "hh" || Ext == "H";
640 }
641 
642 RewriteModernObjC::RewriteModernObjC(std::string inFile,
643  std::unique_ptr<raw_ostream> OS,
645  const LangOptions &LOpts,
646  bool silenceMacroWarn, bool LineInfo)
647  : Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(std::move(OS)),
648  SilenceRewriteMacroWarning(silenceMacroWarn), GenerateLineInfo(LineInfo) {
649  IsHeader = IsHeaderFile(inFile);
650  RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
651  "rewriting sub-expression within a macro (may not be correct)");
652  // FIXME. This should be an error. But if block is not called, it is OK. And it
653  // may break including some headers.
654  GlobalBlockRewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
655  "rewriting block literal declared in global scope is not implemented");
656 
657  TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
659  "rewriter doesn't support user-specified control flow semantics "
660  "for @try/@finally (code may not execute properly)");
661 }
662 
663 std::unique_ptr<ASTConsumer> clang::CreateModernObjCRewriter(
664  const std::string &InFile, std::unique_ptr<raw_ostream> OS,
665  DiagnosticsEngine &Diags, const LangOptions &LOpts,
666  bool SilenceRewriteMacroWarning, bool LineInfo) {
667  return std::make_unique<RewriteModernObjC>(InFile, std::move(OS), Diags,
668  LOpts, SilenceRewriteMacroWarning,
669  LineInfo);
670 }
671 
672 void RewriteModernObjC::InitializeCommon(ASTContext &context) {
673  Context = &context;
674  SM = &Context->getSourceManager();
675  TUDecl = Context->getTranslationUnitDecl();
676  MsgSendFunctionDecl = nullptr;
677  MsgSendSuperFunctionDecl = nullptr;
678  MsgSendStretFunctionDecl = nullptr;
679  MsgSendSuperStretFunctionDecl = nullptr;
680  MsgSendFpretFunctionDecl = nullptr;
681  GetClassFunctionDecl = nullptr;
682  GetMetaClassFunctionDecl = nullptr;
683  GetSuperClassFunctionDecl = nullptr;
684  SelGetUidFunctionDecl = nullptr;
685  CFStringFunctionDecl = nullptr;
686  ConstantStringClassReference = nullptr;
687  NSStringRecord = nullptr;
688  CurMethodDef = nullptr;
689  CurFunctionDef = nullptr;
690  GlobalVarDecl = nullptr;
691  GlobalConstructionExp = nullptr;
692  SuperStructDecl = nullptr;
693  ProtocolTypeDecl = nullptr;
694  ConstantStringDecl = nullptr;
695  BcLabelCount = 0;
696  SuperConstructorFunctionDecl = nullptr;
697  NumObjCStringLiterals = 0;
698  PropParentMap = nullptr;
699  CurrentBody = nullptr;
700  DisableReplaceStmt = false;
701  objc_impl_method = false;
702 
703  // Get the ID and start/end of the main file.
704  MainFileID = SM->getMainFileID();
705  llvm::MemoryBufferRef MainBuf = SM->getBufferOrFake(MainFileID);
706  MainFileStart = MainBuf.getBufferStart();
707  MainFileEnd = MainBuf.getBufferEnd();
708 
709  Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
710 }
711 
712 //===----------------------------------------------------------------------===//
713 // Top Level Driver Code
714 //===----------------------------------------------------------------------===//
715 
716 void RewriteModernObjC::HandleTopLevelSingleDecl(Decl *D) {
717  if (Diags.hasErrorOccurred())
718  return;
719 
720  // Two cases: either the decl could be in the main file, or it could be in a
721  // #included file. If the former, rewrite it now. If the later, check to see
722  // if we rewrote the #include/#import.
723  SourceLocation Loc = D->getLocation();
724  Loc = SM->getExpansionLoc(Loc);
725 
726  // If this is for a builtin, ignore it.
727  if (Loc.isInvalid()) return;
728 
729  // Look for built-in declarations that we need to refer during the rewrite.
730  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
731  RewriteFunctionDecl(FD);
732  } else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
733  // declared in <Foundation/NSString.h>
734  if (FVD->getName() == "_NSConstantStringClassReference") {
735  ConstantStringClassReference = FVD;
736  return;
737  }
738  } else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
739  RewriteCategoryDecl(CD);
740  } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
741  if (PD->isThisDeclarationADefinition())
742  RewriteProtocolDecl(PD);
743  } else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
744  // Recurse into linkage specifications
745  for (DeclContext::decl_iterator DI = LSD->decls_begin(),
746  DIEnd = LSD->decls_end();
747  DI != DIEnd; ) {
748  if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>((*DI))) {
749  if (!IFace->isThisDeclarationADefinition()) {
751  SourceLocation StartLoc = IFace->getBeginLoc();
752  do {
753  if (isa<ObjCInterfaceDecl>(*DI) &&
754  !cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
755  StartLoc == (*DI)->getBeginLoc())
756  DG.push_back(*DI);
757  else
758  break;
759 
760  ++DI;
761  } while (DI != DIEnd);
762  RewriteForwardClassDecl(DG);
763  continue;
764  }
765  else {
766  // Keep track of all interface declarations seen.
767  ObjCInterfacesSeen.push_back(IFace);
768  ++DI;
769  continue;
770  }
771  }
772 
773  if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>((*DI))) {
774  if (!Proto->isThisDeclarationADefinition()) {
776  SourceLocation StartLoc = Proto->getBeginLoc();
777  do {
778  if (isa<ObjCProtocolDecl>(*DI) &&
779  !cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
780  StartLoc == (*DI)->getBeginLoc())
781  DG.push_back(*DI);
782  else
783  break;
784 
785  ++DI;
786  } while (DI != DIEnd);
787  RewriteForwardProtocolDecl(DG);
788  continue;
789  }
790  }
791 
792  HandleTopLevelSingleDecl(*DI);
793  ++DI;
794  }
795  }
796  // If we have a decl in the main file, see if we should rewrite it.
797  if (SM->isWrittenInMainFile(Loc))
798  return HandleDeclInMainFile(D);
799 }
800 
801 //===----------------------------------------------------------------------===//
802 // Syntactic (non-AST) Rewriting Code
803 //===----------------------------------------------------------------------===//
804 
805 void RewriteModernObjC::RewriteInclude() {
806  SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
807  StringRef MainBuf = SM->getBufferData(MainFileID);
808  const char *MainBufStart = MainBuf.begin();
809  const char *MainBufEnd = MainBuf.end();
810  size_t ImportLen = strlen("import");
811 
812  // Loop over the whole file, looking for includes.
813  for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
814  if (*BufPtr == '#') {
815  if (++BufPtr == MainBufEnd)
816  return;
817  while (*BufPtr == ' ' || *BufPtr == '\t')
818  if (++BufPtr == MainBufEnd)
819  return;
820  if (!strncmp(BufPtr, "import", ImportLen)) {
821  // replace import with include
822  SourceLocation ImportLoc =
823  LocStart.getLocWithOffset(BufPtr-MainBufStart);
824  ReplaceText(ImportLoc, ImportLen, "include");
825  BufPtr += ImportLen;
826  }
827  }
828  }
829 }
830 
831 static void WriteInternalIvarName(const ObjCInterfaceDecl *IDecl,
832  ObjCIvarDecl *IvarDecl, std::string &Result) {
833  Result += "OBJC_IVAR_$_";
834  Result += IDecl->getName();
835  Result += "$";
836  Result += IvarDecl->getName();
837 }
838 
841  const ObjCInterfaceDecl *ClassDecl = D->getContainingInterface();
842 
843  // Build name of symbol holding ivar offset.
844  std::string IvarOffsetName;
845  if (D->isBitField())
846  ObjCIvarBitfieldGroupOffset(D, IvarOffsetName);
847  else
848  WriteInternalIvarName(ClassDecl, D, IvarOffsetName);
849 
850  std::string S = "(*(";
851  QualType IvarT = D->getType();
852  if (D->isBitField())
853  IvarT = GetGroupRecordTypeForObjCIvarBitfield(D);
854 
855  if (!isa<TypedefType>(IvarT) && IvarT->isRecordType()) {
856  RecordDecl *RD = IvarT->castAs<RecordType>()->getDecl();
857  RD = RD->getDefinition();
858  if (RD && !RD->getDeclName().getAsIdentifierInfo()) {
859  // decltype(((Foo_IMPL*)0)->bar) *
860  auto *CDecl = cast<ObjCContainerDecl>(D->getDeclContext());
861  // ivar in class extensions requires special treatment.
862  if (ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CDecl))
863  CDecl = CatDecl->getClassInterface();
864  std::string RecName = std::string(CDecl->getName());
865  RecName += "_IMPL";
866  RecordDecl *RD =
867  RecordDecl::Create(*Context, TTK_Struct, TUDecl, SourceLocation(),
868  SourceLocation(), &Context->Idents.get(RecName));
869  QualType PtrStructIMPL = Context->getPointerType(Context->getTagDeclType(RD));
870  unsigned UnsignedIntSize =
871  static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
872  Expr *Zero = IntegerLiteral::Create(*Context,
873  llvm::APInt(UnsignedIntSize, 0),
874  Context->UnsignedIntTy, SourceLocation());
875  Zero = NoTypeInfoCStyleCastExpr(Context, PtrStructIMPL, CK_BitCast, Zero);
876  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
877  Zero);
878  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
879  SourceLocation(),
880  &Context->Idents.get(D->getNameAsString()),
881  IvarT, nullptr,
882  /*BitWidth=*/nullptr, /*Mutable=*/true,
883  ICIS_NoInit);
884  MemberExpr *ME = MemberExpr::CreateImplicit(
885  *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
886  IvarT = Context->getDecltypeType(ME, ME->getType());
887  }
888  }
889  convertObjCTypeToCStyleType(IvarT);
890  QualType castT = Context->getPointerType(IvarT);
891  std::string TypeString(castT.getAsString(Context->getPrintingPolicy()));
892  S += TypeString;
893  S += ")";
894 
895  // ((char *)self + IVAR_OFFSET_SYMBOL_NAME)
896  S += "((char *)self + ";
897  S += IvarOffsetName;
898  S += "))";
899  if (D->isBitField()) {
900  S += ".";
901  S += D->getNameAsString();
902  }
903  ReferencedIvars[const_cast<ObjCInterfaceDecl *>(ClassDecl)].insert(D);
904  return S;
905 }
906 
907 /// mustSynthesizeSetterGetterMethod - returns true if setter or getter has not
908 /// been found in the class implementation. In this case, it must be synthesized.
910  ObjCPropertyDecl *PD,
911  bool getter) {
912  auto *OMD = IMP->getInstanceMethod(getter ? PD->getGetterName()
913  : PD->getSetterName());
914  return !OMD || OMD->isSynthesizedAccessorStub();
915 }
916 
917 void RewriteModernObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
919  ObjCCategoryImplDecl *CID) {
920  static bool objcGetPropertyDefined = false;
921  static bool objcSetPropertyDefined = false;
922  SourceLocation startGetterSetterLoc;
923 
924  if (PID->getBeginLoc().isValid()) {
925  SourceLocation startLoc = PID->getBeginLoc();
926  InsertText(startLoc, "// ");
927  const char *startBuf = SM->getCharacterData(startLoc);
928  assert((*startBuf == '@') && "bogus @synthesize location");
929  const char *semiBuf = strchr(startBuf, ';');
930  assert((*semiBuf == ';') && "@synthesize: can't find ';'");
931  startGetterSetterLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
932  } else
933  startGetterSetterLoc = IMD ? IMD->getEndLoc() : CID->getEndLoc();
934 
935  if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
936  return; // FIXME: is this correct?
937 
938  // Generate the 'getter' function.
939  ObjCPropertyDecl *PD = PID->getPropertyDecl();
940  ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
941  assert(IMD && OID && "Synthesized ivars must be attached to @implementation");
942 
943  unsigned Attributes = PD->getPropertyAttributes();
944  if (mustSynthesizeSetterGetterMethod(IMD, PD, true /*getter*/)) {
945  bool GenGetProperty =
946  !(Attributes & ObjCPropertyAttribute::kind_nonatomic) &&
947  (Attributes & (ObjCPropertyAttribute::kind_retain |
949  std::string Getr;
950  if (GenGetProperty && !objcGetPropertyDefined) {
951  objcGetPropertyDefined = true;
952  // FIXME. Is this attribute correct in all cases?
953  Getr = "\nextern \"C\" __declspec(dllimport) "
954  "id objc_getProperty(id, SEL, long, bool);\n";
955  }
956  RewriteObjCMethodDecl(OID->getContainingInterface(),
957  PID->getGetterMethodDecl(), Getr);
958  Getr += "{ ";
959  // Synthesize an explicit cast to gain access to the ivar.
960  // See objc-act.c:objc_synthesize_new_getter() for details.
961  if (GenGetProperty) {
962  // return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
963  Getr += "typedef ";
964  const FunctionType *FPRetType = nullptr;
965  RewriteTypeIntoString(PID->getGetterMethodDecl()->getReturnType(), Getr,
966  FPRetType);
967  Getr += " _TYPE";
968  if (FPRetType) {
969  Getr += ")"; // close the precedence "scope" for "*".
970 
971  // Now, emit the argument types (if any).
972  if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
973  Getr += "(";
974  for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
975  if (i) Getr += ", ";
976  std::string ParamStr =
977  FT->getParamType(i).getAsString(Context->getPrintingPolicy());
978  Getr += ParamStr;
979  }
980  if (FT->isVariadic()) {
981  if (FT->getNumParams())
982  Getr += ", ";
983  Getr += "...";
984  }
985  Getr += ")";
986  } else
987  Getr += "()";
988  }
989  Getr += ";\n";
990  Getr += "return (_TYPE)";
991  Getr += "objc_getProperty(self, _cmd, ";
992  RewriteIvarOffsetComputation(OID, Getr);
993  Getr += ", 1)";
994  }
995  else
996  Getr += "return " + getIvarAccessString(OID);
997  Getr += "; }";
998  InsertText(startGetterSetterLoc, Getr);
999  }
1000 
1001  if (PD->isReadOnly() ||
1002  !mustSynthesizeSetterGetterMethod(IMD, PD, false /*setter*/))
1003  return;
1004 
1005  // Generate the 'setter' function.
1006  std::string Setr;
1007  bool GenSetProperty = Attributes & (ObjCPropertyAttribute::kind_retain |
1009  if (GenSetProperty && !objcSetPropertyDefined) {
1010  objcSetPropertyDefined = true;
1011  // FIXME. Is this attribute correct in all cases?
1012  Setr = "\nextern \"C\" __declspec(dllimport) "
1013  "void objc_setProperty (id, SEL, long, id, bool, bool);\n";
1014  }
1015 
1016  RewriteObjCMethodDecl(OID->getContainingInterface(),
1017  PID->getSetterMethodDecl(), Setr);
1018  Setr += "{ ";
1019  // Synthesize an explicit cast to initialize the ivar.
1020  // See objc-act.c:objc_synthesize_new_setter() for details.
1021  if (GenSetProperty) {
1022  Setr += "objc_setProperty (self, _cmd, ";
1023  RewriteIvarOffsetComputation(OID, Setr);
1024  Setr += ", (id)";
1025  Setr += PD->getName();
1026  Setr += ", ";
1027  if (Attributes & ObjCPropertyAttribute::kind_nonatomic)
1028  Setr += "0, ";
1029  else
1030  Setr += "1, ";
1031  if (Attributes & ObjCPropertyAttribute::kind_copy)
1032  Setr += "1)";
1033  else
1034  Setr += "0)";
1035  }
1036  else {
1037  Setr += getIvarAccessString(OID) + " = ";
1038  Setr += PD->getName();
1039  }
1040  Setr += "; }\n";
1041  InsertText(startGetterSetterLoc, Setr);
1042 }
1043 
1045  std::string &typedefString) {
1046  typedefString += "\n#ifndef _REWRITER_typedef_";
1047  typedefString += ForwardDecl->getNameAsString();
1048  typedefString += "\n";
1049  typedefString += "#define _REWRITER_typedef_";
1050  typedefString += ForwardDecl->getNameAsString();
1051  typedefString += "\n";
1052  typedefString += "typedef struct objc_object ";
1053  typedefString += ForwardDecl->getNameAsString();
1054  // typedef struct { } _objc_exc_Classname;
1055  typedefString += ";\ntypedef struct {} _objc_exc_";
1056  typedefString += ForwardDecl->getNameAsString();
1057  typedefString += ";\n#endif\n";
1058 }
1059 
1060 void RewriteModernObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
1061  const std::string &typedefString) {
1062  SourceLocation startLoc = ClassDecl->getBeginLoc();
1063  const char *startBuf = SM->getCharacterData(startLoc);
1064  const char *semiPtr = strchr(startBuf, ';');
1065  // Replace the @class with typedefs corresponding to the classes.
1066  ReplaceText(startLoc, semiPtr-startBuf+1, typedefString);
1067 }
1068 
1069 void RewriteModernObjC::RewriteForwardClassDecl(DeclGroupRef D) {
1070  std::string typedefString;
1071  for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
1072  if (ObjCInterfaceDecl *ForwardDecl = dyn_cast<ObjCInterfaceDecl>(*I)) {
1073  if (I == D.begin()) {
1074  // Translate to typedef's that forward reference structs with the same name
1075  // as the class. As a convenience, we include the original declaration
1076  // as a comment.
1077  typedefString += "// @class ";
1078  typedefString += ForwardDecl->getNameAsString();
1079  typedefString += ";";
1080  }
1081  RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1082  }
1083  else
1084  HandleTopLevelSingleDecl(*I);
1085  }
1086  DeclGroupRef::iterator I = D.begin();
1087  RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(*I), typedefString);
1088 }
1089 
1090 void RewriteModernObjC::RewriteForwardClassDecl(
1091  const SmallVectorImpl<Decl *> &D) {
1092  std::string typedefString;
1093  for (unsigned i = 0; i < D.size(); i++) {
1094  ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(D[i]);
1095  if (i == 0) {
1096  typedefString += "// @class ";
1097  typedefString += ForwardDecl->getNameAsString();
1098  typedefString += ";";
1099  }
1100  RewriteOneForwardClassDecl(ForwardDecl, typedefString);
1101  }
1102  RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(D[0]), typedefString);
1103 }
1104 
1105 void RewriteModernObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
1106  // When method is a synthesized one, such as a getter/setter there is
1107  // nothing to rewrite.
1108  if (Method->isImplicit())
1109  return;
1110  SourceLocation LocStart = Method->getBeginLoc();
1111  SourceLocation LocEnd = Method->getEndLoc();
1112 
1113  if (SM->getExpansionLineNumber(LocEnd) >
1114  SM->getExpansionLineNumber(LocStart)) {
1115  InsertText(LocStart, "#if 0\n");
1116  ReplaceText(LocEnd, 1, ";\n#endif\n");
1117  } else {
1118  InsertText(LocStart, "// ");
1119  }
1120 }
1121 
1122 void RewriteModernObjC::RewriteProperty(ObjCPropertyDecl *prop) {
1123  SourceLocation Loc = prop->getAtLoc();
1124 
1125  ReplaceText(Loc, 0, "// ");
1126  // FIXME: handle properties that are declared across multiple lines.
1127 }
1128 
1129 void RewriteModernObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
1130  SourceLocation LocStart = CatDecl->getBeginLoc();
1131 
1132  // FIXME: handle category headers that are declared across multiple lines.
1133  if (CatDecl->getIvarRBraceLoc().isValid()) {
1134  ReplaceText(LocStart, 1, "/** ");
1135  ReplaceText(CatDecl->getIvarRBraceLoc(), 1, "**/ ");
1136  }
1137  else {
1138  ReplaceText(LocStart, 0, "// ");
1139  }
1140 
1141  for (auto *I : CatDecl->instance_properties())
1142  RewriteProperty(I);
1143 
1144  for (auto *I : CatDecl->instance_methods())
1145  RewriteMethodDeclaration(I);
1146  for (auto *I : CatDecl->class_methods())
1147  RewriteMethodDeclaration(I);
1148 
1149  // Lastly, comment out the @end.
1150  ReplaceText(CatDecl->getAtEndRange().getBegin(),
1151  strlen("@end"), "/* @end */\n");
1152 }
1153 
1154 void RewriteModernObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
1155  SourceLocation LocStart = PDecl->getBeginLoc();
1156  assert(PDecl->isThisDeclarationADefinition());
1157 
1158  // FIXME: handle protocol headers that are declared across multiple lines.
1159  ReplaceText(LocStart, 0, "// ");
1160 
1161  for (auto *I : PDecl->instance_methods())
1162  RewriteMethodDeclaration(I);
1163  for (auto *I : PDecl->class_methods())
1164  RewriteMethodDeclaration(I);
1165  for (auto *I : PDecl->instance_properties())
1166  RewriteProperty(I);
1167 
1168  // Lastly, comment out the @end.
1169  SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
1170  ReplaceText(LocEnd, strlen("@end"), "/* @end */\n");
1171 
1172  // Must comment out @optional/@required
1173  const char *startBuf = SM->getCharacterData(LocStart);
1174  const char *endBuf = SM->getCharacterData(LocEnd);
1175  for (const char *p = startBuf; p < endBuf; p++) {
1176  if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
1177  SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
1178  ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
1179 
1180  }
1181  else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
1182  SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
1183  ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
1184 
1185  }
1186  }
1187 }
1188 
1189 void RewriteModernObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
1190  SourceLocation LocStart = (*D.begin())->getBeginLoc();
1191  if (LocStart.isInvalid())
1192  llvm_unreachable("Invalid SourceLocation");
1193  // FIXME: handle forward protocol that are declared across multiple lines.
1194  ReplaceText(LocStart, 0, "// ");
1195 }
1196 
1197 void
1198 RewriteModernObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
1199  SourceLocation LocStart = DG[0]->getBeginLoc();
1200  if (LocStart.isInvalid())
1201  llvm_unreachable("Invalid SourceLocation");
1202  // FIXME: handle forward protocol that are declared across multiple lines.
1203  ReplaceText(LocStart, 0, "// ");
1204 }
1205 
1206 void RewriteModernObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
1207  const FunctionType *&FPRetType) {
1208  if (T->isObjCQualifiedIdType())
1209  ResultStr += "id";
1210  else if (T->isFunctionPointerType() ||
1211  T->isBlockPointerType()) {
1212  // needs special handling, since pointer-to-functions have special
1213  // syntax (where a decaration models use).
1214  QualType retType = T;
1215  QualType PointeeTy;
1216  if (const PointerType* PT = retType->getAs<PointerType>())
1217  PointeeTy = PT->getPointeeType();
1218  else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
1219  PointeeTy = BPT->getPointeeType();
1220  if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
1221  ResultStr +=
1222  FPRetType->getReturnType().getAsString(Context->getPrintingPolicy());
1223  ResultStr += "(*";
1224  }
1225  } else
1226  ResultStr += T.getAsString(Context->getPrintingPolicy());
1227 }
1228 
1229 void RewriteModernObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
1230  ObjCMethodDecl *OMD,
1231  std::string &ResultStr) {
1232  //fprintf(stderr,"In RewriteObjCMethodDecl\n");
1233  const FunctionType *FPRetType = nullptr;
1234  ResultStr += "\nstatic ";
1235  RewriteTypeIntoString(OMD->getReturnType(), ResultStr, FPRetType);
1236  ResultStr += " ";
1237 
1238  // Unique method name
1239  std::string NameStr;
1240 
1241  if (OMD->isInstanceMethod())
1242  NameStr += "_I_";
1243  else
1244  NameStr += "_C_";
1245 
1246  NameStr += IDecl->getNameAsString();
1247  NameStr += "_";
1248 
1249  if (ObjCCategoryImplDecl *CID =
1250  dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
1251  NameStr += CID->getNameAsString();
1252  NameStr += "_";
1253  }
1254  // Append selector names, replacing ':' with '_'
1255  {
1256  std::string selString = OMD->getSelector().getAsString();
1257  int len = selString.size();
1258  for (int i = 0; i < len; i++)
1259  if (selString[i] == ':')
1260  selString[i] = '_';
1261  NameStr += selString;
1262  }
1263  // Remember this name for metadata emission
1264  MethodInternalNames[OMD] = NameStr;
1265  ResultStr += NameStr;
1266 
1267  // Rewrite arguments
1268  ResultStr += "(";
1269 
1270  // invisible arguments
1271  if (OMD->isInstanceMethod()) {
1272  QualType selfTy = Context->getObjCInterfaceType(IDecl);
1273  selfTy = Context->getPointerType(selfTy);
1274  if (!LangOpts.MicrosoftExt) {
1275  if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
1276  ResultStr += "struct ";
1277  }
1278  // When rewriting for Microsoft, explicitly omit the structure name.
1279  ResultStr += IDecl->getNameAsString();
1280  ResultStr += " *";
1281  }
1282  else
1283  ResultStr += Context->getObjCClassType().getAsString(
1284  Context->getPrintingPolicy());
1285 
1286  ResultStr += " self, ";
1287  ResultStr += Context->getObjCSelType().getAsString(Context->getPrintingPolicy());
1288  ResultStr += " _cmd";
1289 
1290  // Method arguments.
1291  for (const auto *PDecl : OMD->parameters()) {
1292  ResultStr += ", ";
1293  if (PDecl->getType()->isObjCQualifiedIdType()) {
1294  ResultStr += "id ";
1295  ResultStr += PDecl->getNameAsString();
1296  } else {
1297  std::string Name = PDecl->getNameAsString();
1298  QualType QT = PDecl->getType();
1299  // Make sure we convert "t (^)(...)" to "t (*)(...)".
1300  (void)convertBlockPointerToFunctionPointer(QT);
1301  QT.getAsStringInternal(Name, Context->getPrintingPolicy());
1302  ResultStr += Name;
1303  }
1304  }
1305  if (OMD->isVariadic())
1306  ResultStr += ", ...";
1307  ResultStr += ") ";
1308 
1309  if (FPRetType) {
1310  ResultStr += ")"; // close the precedence "scope" for "*".
1311 
1312  // Now, emit the argument types (if any).
1313  if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
1314  ResultStr += "(";
1315  for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
1316  if (i) ResultStr += ", ";
1317  std::string ParamStr =
1318  FT->getParamType(i).getAsString(Context->getPrintingPolicy());
1319  ResultStr += ParamStr;
1320  }
1321  if (FT->isVariadic()) {
1322  if (FT->getNumParams())
1323  ResultStr += ", ";
1324  ResultStr += "...";
1325  }
1326  ResultStr += ")";
1327  } else {
1328  ResultStr += "()";
1329  }
1330  }
1331 }
1332 
1333 void RewriteModernObjC::RewriteImplementationDecl(Decl *OID) {
1334  ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
1335  ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
1336  assert((IMD || CID) && "Unknown implementation type");
1337 
1338  if (IMD) {
1339  if (IMD->getIvarRBraceLoc().isValid()) {
1340  ReplaceText(IMD->getBeginLoc(), 1, "/** ");
1341  ReplaceText(IMD->getIvarRBraceLoc(), 1, "**/ ");
1342  }
1343  else {
1344  InsertText(IMD->getBeginLoc(), "// ");
1345  }
1346  }
1347  else
1348  InsertText(CID->getBeginLoc(), "// ");
1349 
1350  for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
1351  if (!OMD->getBody())
1352  continue;
1353  std::string ResultStr;
1354  RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1355  SourceLocation LocStart = OMD->getBeginLoc();
1356  SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1357 
1358  const char *startBuf = SM->getCharacterData(LocStart);
1359  const char *endBuf = SM->getCharacterData(LocEnd);
1360  ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1361  }
1362 
1363  for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
1364  if (!OMD->getBody())
1365  continue;
1366  std::string ResultStr;
1367  RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
1368  SourceLocation LocStart = OMD->getBeginLoc();
1369  SourceLocation LocEnd = OMD->getCompoundBody()->getBeginLoc();
1370 
1371  const char *startBuf = SM->getCharacterData(LocStart);
1372  const char *endBuf = SM->getCharacterData(LocEnd);
1373  ReplaceText(LocStart, endBuf-startBuf, ResultStr);
1374  }
1375  for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
1376  RewritePropertyImplDecl(I, IMD, CID);
1377 
1378  InsertText(IMD ? IMD->getEndLoc() : CID->getEndLoc(), "// ");
1379 }
1380 
1381 void RewriteModernObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
1382  // Do not synthesize more than once.
1383  if (ObjCSynthesizedStructs.count(ClassDecl))
1384  return;
1385  // Make sure super class's are written before current class is written.
1386  ObjCInterfaceDecl *SuperClass = ClassDecl->getSuperClass();
1387  while (SuperClass) {
1388  RewriteInterfaceDecl(SuperClass);
1389  SuperClass = SuperClass->getSuperClass();
1390  }
1391  std::string ResultStr;
1392  if (!ObjCWrittenInterfaces.count(ClassDecl->getCanonicalDecl())) {
1393  // we haven't seen a forward decl - generate a typedef.
1394  RewriteOneForwardClassDecl(ClassDecl, ResultStr);
1395  RewriteIvarOffsetSymbols(ClassDecl, ResultStr);
1396 
1397  RewriteObjCInternalStruct(ClassDecl, ResultStr);
1398  // Mark this typedef as having been written into its c++ equivalent.
1399  ObjCWrittenInterfaces.insert(ClassDecl->getCanonicalDecl());
1400 
1401  for (auto *I : ClassDecl->instance_properties())
1402  RewriteProperty(I);
1403  for (auto *I : ClassDecl->instance_methods())
1404  RewriteMethodDeclaration(I);
1405  for (auto *I : ClassDecl->class_methods())
1406  RewriteMethodDeclaration(I);
1407 
1408  // Lastly, comment out the @end.
1409  ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
1410  "/* @end */\n");
1411  }
1412 }
1413 
1414 Stmt *RewriteModernObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
1415  SourceRange OldRange = PseudoOp->getSourceRange();
1416 
1417  // We just magically know some things about the structure of this
1418  // expression.
1419  ObjCMessageExpr *OldMsg =
1420  cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
1421  PseudoOp->getNumSemanticExprs() - 1));
1422 
1423  // Because the rewriter doesn't allow us to rewrite rewritten code,
1424  // we need to suppress rewriting the sub-statements.
1425  Expr *Base;
1426  SmallVector<Expr*, 2> Args;
1427  {
1428  DisableReplaceStmtScope S(*this);
1429 
1430  // Rebuild the base expression if we have one.
1431  Base = nullptr;
1432  if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1433  Base = OldMsg->getInstanceReceiver();
1434  Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1435  Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1436  }
1437 
1438  unsigned numArgs = OldMsg->getNumArgs();
1439  for (unsigned i = 0; i < numArgs; i++) {
1440  Expr *Arg = OldMsg->getArg(i);
1441  if (isa<OpaqueValueExpr>(Arg))
1442  Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1443  Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1444  Args.push_back(Arg);
1445  }
1446  }
1447 
1448  // TODO: avoid this copy.
1450  OldMsg->getSelectorLocs(SelLocs);
1451 
1452  ObjCMessageExpr *NewMsg = nullptr;
1453  switch (OldMsg->getReceiverKind()) {
1454  case ObjCMessageExpr::Class:
1455  NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1456  OldMsg->getValueKind(),
1457  OldMsg->getLeftLoc(),
1458  OldMsg->getClassReceiverTypeInfo(),
1459  OldMsg->getSelector(),
1460  SelLocs,
1461  OldMsg->getMethodDecl(),
1462  Args,
1463  OldMsg->getRightLoc(),
1464  OldMsg->isImplicit());
1465  break;
1466 
1467  case ObjCMessageExpr::Instance:
1468  NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1469  OldMsg->getValueKind(),
1470  OldMsg->getLeftLoc(),
1471  Base,
1472  OldMsg->getSelector(),
1473  SelLocs,
1474  OldMsg->getMethodDecl(),
1475  Args,
1476  OldMsg->getRightLoc(),
1477  OldMsg->isImplicit());
1478  break;
1479 
1480  case ObjCMessageExpr::SuperClass:
1481  case ObjCMessageExpr::SuperInstance:
1482  NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1483  OldMsg->getValueKind(),
1484  OldMsg->getLeftLoc(),
1485  OldMsg->getSuperLoc(),
1486  OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1487  OldMsg->getSuperType(),
1488  OldMsg->getSelector(),
1489  SelLocs,
1490  OldMsg->getMethodDecl(),
1491  Args,
1492  OldMsg->getRightLoc(),
1493  OldMsg->isImplicit());
1494  break;
1495  }
1496 
1497  Stmt *Replacement = SynthMessageExpr(NewMsg);
1498  ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1499  return Replacement;
1500 }
1501 
1502 Stmt *RewriteModernObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
1503  SourceRange OldRange = PseudoOp->getSourceRange();
1504 
1505  // We just magically know some things about the structure of this
1506  // expression.
1507  ObjCMessageExpr *OldMsg =
1508  cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
1509 
1510  // Because the rewriter doesn't allow us to rewrite rewritten code,
1511  // we need to suppress rewriting the sub-statements.
1512  Expr *Base = nullptr;
1513  SmallVector<Expr*, 1> Args;
1514  {
1515  DisableReplaceStmtScope S(*this);
1516  // Rebuild the base expression if we have one.
1517  if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
1518  Base = OldMsg->getInstanceReceiver();
1519  Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
1520  Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
1521  }
1522  unsigned numArgs = OldMsg->getNumArgs();
1523  for (unsigned i = 0; i < numArgs; i++) {
1524  Expr *Arg = OldMsg->getArg(i);
1525  if (isa<OpaqueValueExpr>(Arg))
1526  Arg = cast<OpaqueValueExpr>(Arg)->getSourceExpr();
1527  Arg = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Arg));
1528  Args.push_back(Arg);
1529  }
1530  }
1531 
1532  // Intentionally empty.
1534 
1535  ObjCMessageExpr *NewMsg = nullptr;
1536  switch (OldMsg->getReceiverKind()) {
1537  case ObjCMessageExpr::Class:
1538  NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1539  OldMsg->getValueKind(),
1540  OldMsg->getLeftLoc(),
1541  OldMsg->getClassReceiverTypeInfo(),
1542  OldMsg->getSelector(),
1543  SelLocs,
1544  OldMsg->getMethodDecl(),
1545  Args,
1546  OldMsg->getRightLoc(),
1547  OldMsg->isImplicit());
1548  break;
1549 
1550  case ObjCMessageExpr::Instance:
1551  NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1552  OldMsg->getValueKind(),
1553  OldMsg->getLeftLoc(),
1554  Base,
1555  OldMsg->getSelector(),
1556  SelLocs,
1557  OldMsg->getMethodDecl(),
1558  Args,
1559  OldMsg->getRightLoc(),
1560  OldMsg->isImplicit());
1561  break;
1562 
1563  case ObjCMessageExpr::SuperClass:
1564  case ObjCMessageExpr::SuperInstance:
1565  NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
1566  OldMsg->getValueKind(),
1567  OldMsg->getLeftLoc(),
1568  OldMsg->getSuperLoc(),
1569  OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
1570  OldMsg->getSuperType(),
1571  OldMsg->getSelector(),
1572  SelLocs,
1573  OldMsg->getMethodDecl(),
1574  Args,
1575  OldMsg->getRightLoc(),
1576  OldMsg->isImplicit());
1577  break;
1578  }
1579 
1580  Stmt *Replacement = SynthMessageExpr(NewMsg);
1581  ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
1582  return Replacement;
1583 }
1584 
1585 /// SynthCountByEnumWithState - To print:
1586 /// ((NSUInteger (*)
1587 /// (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1588 /// (void *)objc_msgSend)((id)l_collection,
1589 /// sel_registerName(
1590 /// "countByEnumeratingWithState:objects:count:"),
1591 /// &enumState,
1592 /// (id *)__rw_items, (NSUInteger)16)
1593 ///
1594 void RewriteModernObjC::SynthCountByEnumWithState(std::string &buf) {
1595  buf += "((_WIN_NSUInteger (*) (id, SEL, struct __objcFastEnumerationState *, "
1596  "id *, _WIN_NSUInteger))(void *)objc_msgSend)";
1597  buf += "\n\t\t";
1598  buf += "((id)l_collection,\n\t\t";
1599  buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
1600  buf += "\n\t\t";
1601  buf += "&enumState, "
1602  "(id *)__rw_items, (_WIN_NSUInteger)16)";
1603 }
1604 
1605 /// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
1606 /// statement to exit to its outer synthesized loop.
1607 ///
1608 Stmt *RewriteModernObjC::RewriteBreakStmt(BreakStmt *S) {
1609  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
1610  return S;
1611  // replace break with goto __break_label
1612  std::string buf;
1613 
1614  SourceLocation startLoc = S->getBeginLoc();
1615  buf = "goto __break_label_";
1616  buf += utostr(ObjCBcLabelNo.back());
1617  ReplaceText(startLoc, strlen("break"), buf);
1618 
1619  return nullptr;
1620 }
1621 
1622 void RewriteModernObjC::ConvertSourceLocationToLineDirective(
1623  SourceLocation Loc,
1624  std::string &LineString) {
1625  if (Loc.isFileID() && GenerateLineInfo) {
1626  LineString += "\n#line ";
1627  PresumedLoc PLoc = SM->getPresumedLoc(Loc);
1628  LineString += utostr(PLoc.getLine());
1629  LineString += " \"";
1630  LineString += Lexer::Stringify(PLoc.getFilename());
1631  LineString += "\"\n";
1632  }
1633 }
1634 
1635 /// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
1636 /// statement to continue with its inner synthesized loop.
1637 ///
1638 Stmt *RewriteModernObjC::RewriteContinueStmt(ContinueStmt *S) {
1639  if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
1640  return S;
1641  // replace continue with goto __continue_label
1642  std::string buf;
1643 
1644  SourceLocation startLoc = S->getBeginLoc();
1645  buf = "goto __continue_label_";
1646  buf += utostr(ObjCBcLabelNo.back());
1647  ReplaceText(startLoc, strlen("continue"), buf);
1648 
1649  return nullptr;
1650 }
1651 
1652 /// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
1653 /// It rewrites:
1654 /// for ( type elem in collection) { stmts; }
1655 
1656 /// Into:
1657 /// {
1658 /// type elem;
1659 /// struct __objcFastEnumerationState enumState = { 0 };
1660 /// id __rw_items[16];
1661 /// id l_collection = (id)collection;
1662 /// NSUInteger limit = [l_collection countByEnumeratingWithState:&enumState
1663 /// objects:__rw_items count:16];
1664 /// if (limit) {
1665 /// unsigned long startMutations = *enumState.mutationsPtr;
1666 /// do {
1667 /// unsigned long counter = 0;
1668 /// do {
1669 /// if (startMutations != *enumState.mutationsPtr)
1670 /// objc_enumerationMutation(l_collection);
1671 /// elem = (type)enumState.itemsPtr[counter++];
1672 /// stmts;
1673 /// __continue_label: ;
1674 /// } while (counter < limit);
1675 /// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1676 /// objects:__rw_items count:16]));
1677 /// elem = nil;
1678 /// __break_label: ;
1679 /// }
1680 /// else
1681 /// elem = nil;
1682 /// }
1683 ///
1684 Stmt *RewriteModernObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
1685  SourceLocation OrigEnd) {
1686  assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
1687  assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
1688  "ObjCForCollectionStmt Statement stack mismatch");
1689  assert(!ObjCBcLabelNo.empty() &&
1690  "ObjCForCollectionStmt - Label No stack empty");
1691 
1692  SourceLocation startLoc = S->getBeginLoc();
1693  const char *startBuf = SM->getCharacterData(startLoc);
1694  StringRef elementName;
1695  std::string elementTypeAsString;
1696  std::string buf;
1697  // line directive first.
1698  SourceLocation ForEachLoc = S->getForLoc();
1699  ConvertSourceLocationToLineDirective(ForEachLoc, buf);
1700  buf += "{\n\t";
1701  if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
1702  // type elem;
1703  NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
1704  QualType ElementType = cast<ValueDecl>(D)->getType();
1705  if (ElementType->isObjCQualifiedIdType() ||
1706  ElementType->isObjCQualifiedInterfaceType())
1707  // Simply use 'id' for all qualified types.
1708  elementTypeAsString = "id";
1709  else
1710  elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
1711  buf += elementTypeAsString;
1712  buf += " ";
1713  elementName = D->getName();
1714  buf += elementName;
1715  buf += ";\n\t";
1716  }
1717  else {
1718  DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
1719  elementName = DR->getDecl()->getName();
1720  ValueDecl *VD = DR->getDecl();
1721  if (VD->getType()->isObjCQualifiedIdType() ||
1723  // Simply use 'id' for all qualified types.
1724  elementTypeAsString = "id";
1725  else
1726  elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
1727  }
1728 
1729  // struct __objcFastEnumerationState enumState = { 0 };
1730  buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
1731  // id __rw_items[16];
1732  buf += "id __rw_items[16];\n\t";
1733  // id l_collection = (id)
1734  buf += "id l_collection = (id)";
1735  // Find start location of 'collection' the hard way!
1736  const char *startCollectionBuf = startBuf;
1737  startCollectionBuf += 3; // skip 'for'
1738  startCollectionBuf = strchr(startCollectionBuf, '(');
1739  startCollectionBuf++; // skip '('
1740  // find 'in' and skip it.
1741  while (*startCollectionBuf != ' ' ||
1742  *(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
1743  (*(startCollectionBuf+3) != ' ' &&
1744  *(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
1745  startCollectionBuf++;
1746  startCollectionBuf += 3;
1747 
1748  // Replace: "for (type element in" with string constructed thus far.
1749  ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
1750  // Replace ')' in for '(' type elem in collection ')' with ';'
1751  SourceLocation rightParenLoc = S->getRParenLoc();
1752  const char *rparenBuf = SM->getCharacterData(rightParenLoc);
1753  SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
1754  buf = ";\n\t";
1755 
1756  // unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
1757  // objects:__rw_items count:16];
1758  // which is synthesized into:
1759  // NSUInteger limit =
1760  // ((NSUInteger (*)
1761  // (id, SEL, struct __objcFastEnumerationState *, id *, NSUInteger))
1762  // (void *)objc_msgSend)((id)l_collection,
1763  // sel_registerName(
1764  // "countByEnumeratingWithState:objects:count:"),
1765  // (struct __objcFastEnumerationState *)&state,
1766  // (id *)__rw_items, (NSUInteger)16);
1767  buf += "_WIN_NSUInteger limit =\n\t\t";
1768  SynthCountByEnumWithState(buf);
1769  buf += ";\n\t";
1770  /// if (limit) {
1771  /// unsigned long startMutations = *enumState.mutationsPtr;
1772  /// do {
1773  /// unsigned long counter = 0;
1774  /// do {
1775  /// if (startMutations != *enumState.mutationsPtr)
1776  /// objc_enumerationMutation(l_collection);
1777  /// elem = (type)enumState.itemsPtr[counter++];
1778  buf += "if (limit) {\n\t";
1779  buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
1780  buf += "do {\n\t\t";
1781  buf += "unsigned long counter = 0;\n\t\t";
1782  buf += "do {\n\t\t\t";
1783  buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
1784  buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
1785  buf += elementName;
1786  buf += " = (";
1787  buf += elementTypeAsString;
1788  buf += ")enumState.itemsPtr[counter++];";
1789  // Replace ')' in for '(' type elem in collection ')' with all of these.
1790  ReplaceText(lparenLoc, 1, buf);
1791 
1792  /// __continue_label: ;
1793  /// } while (counter < limit);
1794  /// } while ((limit = [l_collection countByEnumeratingWithState:&enumState
1795  /// objects:__rw_items count:16]));
1796  /// elem = nil;
1797  /// __break_label: ;
1798  /// }
1799  /// else
1800  /// elem = nil;
1801  /// }
1802  ///
1803  buf = ";\n\t";
1804  buf += "__continue_label_";
1805  buf += utostr(ObjCBcLabelNo.back());
1806  buf += ": ;";
1807  buf += "\n\t\t";
1808  buf += "} while (counter < limit);\n\t";
1809  buf += "} while ((limit = ";
1810  SynthCountByEnumWithState(buf);
1811  buf += "));\n\t";
1812  buf += elementName;
1813  buf += " = ((";
1814  buf += elementTypeAsString;
1815  buf += ")0);\n\t";
1816  buf += "__break_label_";
1817  buf += utostr(ObjCBcLabelNo.back());
1818  buf += ": ;\n\t";
1819  buf += "}\n\t";
1820  buf += "else\n\t\t";
1821  buf += elementName;
1822  buf += " = ((";
1823  buf += elementTypeAsString;
1824  buf += ")0);\n\t";
1825  buf += "}\n";
1826 
1827  // Insert all these *after* the statement body.
1828  // FIXME: If this should support Obj-C++, support CXXTryStmt
1829  if (isa<CompoundStmt>(S->getBody())) {
1830  SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
1831  InsertText(endBodyLoc, buf);
1832  } else {
1833  /* Need to treat single statements specially. For example:
1834  *
1835  * for (A *a in b) if (stuff()) break;
1836  * for (A *a in b) xxxyy;
1837  *
1838  * The following code simply scans ahead to the semi to find the actual end.
1839  */
1840  const char *stmtBuf = SM->getCharacterData(OrigEnd);
1841  const char *semiBuf = strchr(stmtBuf, ';');
1842  assert(semiBuf && "Can't find ';'");
1843  SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
1844  InsertText(endBodyLoc, buf);
1845  }
1846  Stmts.pop_back();
1847  ObjCBcLabelNo.pop_back();
1848  return nullptr;
1849 }
1850 
1852  buf += "{ struct _FIN { _FIN(id reth) : rethrow(reth) {}\n";
1853  buf += "\t~_FIN() { if (rethrow) objc_exception_throw(rethrow); }\n";
1854  buf += "\tid rethrow;\n";
1855  buf += "\t} _fin_force_rethow(_rethrow);";
1856 }
1857 
1858 /// RewriteObjCSynchronizedStmt -
1859 /// This routine rewrites @synchronized(expr) stmt;
1860 /// into:
1861 /// objc_sync_enter(expr);
1862 /// @try stmt @finally { objc_sync_exit(expr); }
1863 ///
1864 Stmt *RewriteModernObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
1865  // Get the start location and compute the semi location.
1866  SourceLocation startLoc = S->getBeginLoc();
1867  const char *startBuf = SM->getCharacterData(startLoc);
1868 
1869  assert((*startBuf == '@') && "bogus @synchronized location");
1870 
1871  std::string buf;
1872  SourceLocation SynchLoc = S->getAtSynchronizedLoc();
1873  ConvertSourceLocationToLineDirective(SynchLoc, buf);
1874  buf += "{ id _rethrow = 0; id _sync_obj = (id)";
1875 
1876  const char *lparenBuf = startBuf;
1877  while (*lparenBuf != '(') lparenBuf++;
1878  ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
1879 
1880  buf = "; objc_sync_enter(_sync_obj);\n";
1881  buf += "try {\n\tstruct _SYNC_EXIT { _SYNC_EXIT(id arg) : sync_exit(arg) {}";
1882  buf += "\n\t~_SYNC_EXIT() {objc_sync_exit(sync_exit);}";
1883  buf += "\n\tid sync_exit;";
1884  buf += "\n\t} _sync_exit(_sync_obj);\n";
1885 
1886  // We can't use S->getSynchExpr()->getEndLoc() to find the end location, since
1887  // the sync expression is typically a message expression that's already
1888  // been rewritten! (which implies the SourceLocation's are invalid).
1889  SourceLocation RParenExprLoc = S->getSynchBody()->getBeginLoc();
1890  const char *RParenExprLocBuf = SM->getCharacterData(RParenExprLoc);
1891  while (*RParenExprLocBuf != ')') RParenExprLocBuf--;
1892  RParenExprLoc = startLoc.getLocWithOffset(RParenExprLocBuf-startBuf);
1893 
1894  SourceLocation LBranceLoc = S->getSynchBody()->getBeginLoc();
1895  const char *LBraceLocBuf = SM->getCharacterData(LBranceLoc);
1896  assert (*LBraceLocBuf == '{');
1897  ReplaceText(RParenExprLoc, (LBraceLocBuf - SM->getCharacterData(RParenExprLoc) + 1), buf);
1898 
1899  SourceLocation startRBraceLoc = S->getSynchBody()->getEndLoc();
1900  assert((*SM->getCharacterData(startRBraceLoc) == '}') &&
1901  "bogus @synchronized block");
1902 
1903  buf = "} catch (id e) {_rethrow = e;}\n";
1904  Write_RethrowObject(buf);
1905  buf += "}\n";
1906  buf += "}\n";
1907 
1908  ReplaceText(startRBraceLoc, 1, buf);
1909 
1910  return nullptr;
1911 }
1912 
1913 void RewriteModernObjC::WarnAboutReturnGotoStmts(Stmt *S)
1914 {
1915  // Perform a bottom up traversal of all children.
1916  for (Stmt *SubStmt : S->children())
1917  if (SubStmt)
1918  WarnAboutReturnGotoStmts(SubStmt);
1919 
1920  if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
1921  Diags.Report(Context->getFullLoc(S->getBeginLoc()),
1922  TryFinallyContainsReturnDiag);
1923  }
1924 }
1925 
1926 Stmt *RewriteModernObjC::RewriteObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S) {
1927  SourceLocation startLoc = S->getAtLoc();
1928  ReplaceText(startLoc, strlen("@autoreleasepool"), "/* @autoreleasepool */");
1929  ReplaceText(S->getSubStmt()->getBeginLoc(), 1,
1930  "{ __AtAutoreleasePool __autoreleasepool; ");
1931 
1932  return nullptr;
1933 }
1934 
1935 Stmt *RewriteModernObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
1936  ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt();
1937  bool noCatch = S->getNumCatchStmts() == 0;
1938  std::string buf;
1939  SourceLocation TryLocation = S->getAtTryLoc();
1940  ConvertSourceLocationToLineDirective(TryLocation, buf);
1941 
1942  if (finalStmt) {
1943  if (noCatch)
1944  buf += "{ id volatile _rethrow = 0;\n";
1945  else {
1946  buf += "{ id volatile _rethrow = 0;\ntry {\n";
1947  }
1948  }
1949  // Get the start location and compute the semi location.
1950  SourceLocation startLoc = S->getBeginLoc();
1951  const char *startBuf = SM->getCharacterData(startLoc);
1952 
1953  assert((*startBuf == '@') && "bogus @try location");
1954  if (finalStmt)
1955  ReplaceText(startLoc, 1, buf);
1956  else
1957  // @try -> try
1958  ReplaceText(startLoc, 1, "");
1959 
1960  for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
1961  ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
1962  VarDecl *catchDecl = Catch->getCatchParamDecl();
1963 
1964  startLoc = Catch->getBeginLoc();
1965  bool AtRemoved = false;
1966  if (catchDecl) {
1967  QualType t = catchDecl->getType();
1968  if (const ObjCObjectPointerType *Ptr = t->getAs<ObjCObjectPointerType>()) {
1969  // Should be a pointer to a class.
1970  ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
1971  if (IDecl) {
1972  std::string Result;
1973  ConvertSourceLocationToLineDirective(Catch->getBeginLoc(), Result);
1974 
1975  startBuf = SM->getCharacterData(startLoc);
1976  assert((*startBuf == '@') && "bogus @catch location");
1977  SourceLocation rParenLoc = Catch->getRParenLoc();
1978  const char *rParenBuf = SM->getCharacterData(rParenLoc);
1979 
1980  // _objc_exc_Foo *_e as argument to catch.
1981  Result += "catch (_objc_exc_"; Result += IDecl->getNameAsString();
1982  Result += " *_"; Result += catchDecl->getNameAsString();
1983  Result += ")";
1984  ReplaceText(startLoc, rParenBuf-startBuf+1, Result);
1985  // Foo *e = (Foo *)_e;
1986  Result.clear();
1987  Result = "{ ";
1988  Result += IDecl->getNameAsString();
1989  Result += " *"; Result += catchDecl->getNameAsString();
1990  Result += " = ("; Result += IDecl->getNameAsString(); Result += "*)";
1991  Result += "_"; Result += catchDecl->getNameAsString();
1992 
1993  Result += "; ";
1994  SourceLocation lBraceLoc = Catch->getCatchBody()->getBeginLoc();
1995  ReplaceText(lBraceLoc, 1, Result);
1996  AtRemoved = true;
1997  }
1998  }
1999  }
2000  if (!AtRemoved)
2001  // @catch -> catch
2002  ReplaceText(startLoc, 1, "");
2003 
2004  }
2005  if (finalStmt) {
2006  buf.clear();
2007  SourceLocation FinallyLoc = finalStmt->getBeginLoc();
2008 
2009  if (noCatch) {
2010  ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2011  buf += "catch (id e) {_rethrow = e;}\n";
2012  }
2013  else {
2014  buf += "}\n";
2015  ConvertSourceLocationToLineDirective(FinallyLoc, buf);
2016  buf += "catch (id e) {_rethrow = e;}\n";
2017  }
2018 
2019  SourceLocation startFinalLoc = finalStmt->getBeginLoc();
2020  ReplaceText(startFinalLoc, 8, buf);
2021  Stmt *body = finalStmt->getFinallyBody();
2022  SourceLocation startFinalBodyLoc = body->getBeginLoc();
2023  buf.clear();
2024  Write_RethrowObject(buf);
2025  ReplaceText(startFinalBodyLoc, 1, buf);
2026 
2027  SourceLocation endFinalBodyLoc = body->getEndLoc();
2028  ReplaceText(endFinalBodyLoc, 1, "}\n}");
2029  // Now check for any return/continue/go statements within the @try.
2030  WarnAboutReturnGotoStmts(S->getTryBody());
2031  }
2032 
2033  return nullptr;
2034 }
2035 
2036 // This can't be done with ReplaceStmt(S, ThrowExpr), since
2037 // the throw expression is typically a message expression that's already
2038 // been rewritten! (which implies the SourceLocation's are invalid).
2039 Stmt *RewriteModernObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
2040  // Get the start location and compute the semi location.
2041  SourceLocation startLoc = S->getBeginLoc();
2042  const char *startBuf = SM->getCharacterData(startLoc);
2043 
2044  assert((*startBuf == '@') && "bogus @throw location");
2045 
2046  std::string buf;
2047  /* void objc_exception_throw(id) __attribute__((noreturn)); */
2048  if (S->getThrowExpr())
2049  buf = "objc_exception_throw(";
2050  else
2051  buf = "throw";
2052 
2053  // handle "@ throw" correctly.
2054  const char *wBuf = strchr(startBuf, 'w');
2055  assert((*wBuf == 'w') && "@throw: can't find 'w'");
2056  ReplaceText(startLoc, wBuf-startBuf+1, buf);
2057 
2058  SourceLocation endLoc = S->getEndLoc();
2059  const char *endBuf = SM->getCharacterData(endLoc);
2060  const char *semiBuf = strchr(endBuf, ';');
2061  assert((*semiBuf == ';') && "@throw: can't find ';'");
2062  SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
2063  if (S->getThrowExpr())
2064  ReplaceText(semiLoc, 1, ");");
2065  return nullptr;
2066 }
2067 
2068 Stmt *RewriteModernObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
2069  // Create a new string expression.
2070  std::string StrEncoding;
2071  Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
2072  Expr *Replacement = getStringLiteral(StrEncoding);
2073  ReplaceStmt(Exp, Replacement);
2074 
2075  // Replace this subexpr in the parent.
2076  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2077  return Replacement;
2078 }
2079 
2080 Stmt *RewriteModernObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
2081  if (!SelGetUidFunctionDecl)
2082  SynthSelGetUidFunctionDecl();
2083  assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
2084  // Create a call to sel_registerName("selName").
2085  SmallVector<Expr*, 8> SelExprs;
2086  SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
2087  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2088  SelExprs);
2089  ReplaceStmt(Exp, SelExp);
2090  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2091  return SelExp;
2092 }
2093 
2094 CallExpr *
2095 RewriteModernObjC::SynthesizeCallToFunctionDecl(FunctionDecl *FD,
2096  ArrayRef<Expr *> Args,
2097  SourceLocation StartLoc,
2098  SourceLocation EndLoc) {
2099  // Get the type, we will need to reference it in a couple spots.
2100  QualType msgSendType = FD->getType();
2101 
2102  // Create a reference to the objc_msgSend() declaration.
2103  DeclRefExpr *DRE = new (Context) DeclRefExpr(*Context, FD, false, msgSendType,
2105 
2106  // Now, we cast the reference to a pointer to the objc_msgSend type.
2107  QualType pToFunc = Context->getPointerType(msgSendType);
2108  ImplicitCastExpr *ICE =
2109  ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
2110  DRE, nullptr, VK_RValue, FPOptionsOverride());
2111 
2112  const auto *FT = msgSendType->castAs<FunctionType>();
2113  CallExpr *Exp =
2114  CallExpr::Create(*Context, ICE, Args, FT->getCallResultType(*Context),
2115  VK_RValue, EndLoc, FPOptionsOverride());
2116  return Exp;
2117 }
2118 
2119 static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
2120  const char *&startRef, const char *&endRef) {
2121  while (startBuf < endBuf) {
2122  if (*startBuf == '<')
2123  startRef = startBuf; // mark the start.
2124  if (*startBuf == '>') {
2125  if (startRef && *startRef == '<') {
2126  endRef = startBuf; // mark the end.
2127  return true;
2128  }
2129  return false;
2130  }
2131  startBuf++;
2132  }
2133  return false;
2134 }
2135 
2136 static void scanToNextArgument(const char *&argRef) {
2137  int angle = 0;
2138  while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
2139  if (*argRef == '<')
2140  angle++;
2141  else if (*argRef == '>')
2142  angle--;
2143  argRef++;
2144  }
2145  assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
2146 }
2147 
2148 bool RewriteModernObjC::needToScanForQualifiers(QualType T) {
2149  if (T->isObjCQualifiedIdType())
2150  return true;
2151  if (const PointerType *PT = T->getAs<PointerType>()) {
2153  return true;
2154  }
2155  if (T->isObjCObjectPointerType()) {
2156  T = T->getPointeeType();
2157  return T->isObjCQualifiedInterfaceType();
2158  }
2159  if (T->isArrayType()) {
2160  QualType ElemTy = Context->getBaseElementType(T);
2161  return needToScanForQualifiers(ElemTy);
2162  }
2163  return false;
2164 }
2165 
2166 void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
2167  QualType Type = E->getType();
2168  if (needToScanForQualifiers(Type)) {
2169  SourceLocation Loc, EndLoc;
2170 
2171  if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
2172  Loc = ECE->getLParenLoc();
2173  EndLoc = ECE->getRParenLoc();
2174  } else {
2175  Loc = E->getBeginLoc();
2176  EndLoc = E->getEndLoc();
2177  }
2178  // This will defend against trying to rewrite synthesized expressions.
2179  if (Loc.isInvalid() || EndLoc.isInvalid())
2180  return;
2181 
2182  const char *startBuf = SM->getCharacterData(Loc);
2183  const char *endBuf = SM->getCharacterData(EndLoc);
2184  const char *startRef = nullptr, *endRef = nullptr;
2185  if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2186  // Get the locations of the startRef, endRef.
2187  SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
2188  SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
2189  // Comment out the protocol references.
2190  InsertText(LessLoc, "/*");
2191  InsertText(GreaterLoc, "*/");
2192  }
2193  }
2194 }
2195 
2196 void RewriteModernObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
2197  SourceLocation Loc;
2198  QualType Type;
2199  const FunctionProtoType *proto = nullptr;
2200  if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
2201  Loc = VD->getLocation();
2202  Type = VD->getType();
2203  }
2204  else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
2205  Loc = FD->getLocation();
2206  // Check for ObjC 'id' and class types that have been adorned with protocol
2207  // information (id<p>, C<p>*). The protocol references need to be rewritten!
2208  const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2209  assert(funcType && "missing function type");
2210  proto = dyn_cast<FunctionProtoType>(funcType);
2211  if (!proto)
2212  return;
2213  Type = proto->getReturnType();
2214  }
2215  else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
2216  Loc = FD->getLocation();
2217  Type = FD->getType();
2218  }
2219  else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(Dcl)) {
2220  Loc = TD->getLocation();
2221  Type = TD->getUnderlyingType();
2222  }
2223  else
2224  return;
2225 
2226  if (needToScanForQualifiers(Type)) {
2227  // Since types are unique, we need to scan the buffer.
2228 
2229  const char *endBuf = SM->getCharacterData(Loc);
2230  const char *startBuf = endBuf;
2231  while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
2232  startBuf--; // scan backward (from the decl location) for return type.
2233  const char *startRef = nullptr, *endRef = nullptr;
2234  if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2235  // Get the locations of the startRef, endRef.
2236  SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
2237  SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
2238  // Comment out the protocol references.
2239  InsertText(LessLoc, "/*");
2240  InsertText(GreaterLoc, "*/");
2241  }
2242  }
2243  if (!proto)
2244  return; // most likely, was a variable
2245  // Now check arguments.
2246  const char *startBuf = SM->getCharacterData(Loc);
2247  const char *startFuncBuf = startBuf;
2248  for (unsigned i = 0; i < proto->getNumParams(); i++) {
2249  if (needToScanForQualifiers(proto->getParamType(i))) {
2250  // Since types are unique, we need to scan the buffer.
2251 
2252  const char *endBuf = startBuf;
2253  // scan forward (from the decl location) for argument types.
2254  scanToNextArgument(endBuf);
2255  const char *startRef = nullptr, *endRef = nullptr;
2256  if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
2257  // Get the locations of the startRef, endRef.
2258  SourceLocation LessLoc =
2259  Loc.getLocWithOffset(startRef-startFuncBuf);
2260  SourceLocation GreaterLoc =
2261  Loc.getLocWithOffset(endRef-startFuncBuf+1);
2262  // Comment out the protocol references.
2263  InsertText(LessLoc, "/*");
2264  InsertText(GreaterLoc, "*/");
2265  }
2266  startBuf = ++endBuf;
2267  }
2268  else {
2269  // If the function name is derived from a macro expansion, then the
2270  // argument buffer will not follow the name. Need to speak with Chris.
2271  while (*startBuf && *startBuf != ')' && *startBuf != ',')
2272  startBuf++; // scan forward (from the decl location) for argument types.
2273  startBuf++;
2274  }
2275  }
2276 }
2277 
2278 void RewriteModernObjC::RewriteTypeOfDecl(VarDecl *ND) {
2279  QualType QT = ND->getType();
2280  const Type* TypePtr = QT->getAs<Type>();
2281  if (!isa<TypeOfExprType>(TypePtr))
2282  return;
2283  while (isa<TypeOfExprType>(TypePtr)) {
2284  const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
2285  QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
2286  TypePtr = QT->getAs<Type>();
2287  }
2288  // FIXME. This will not work for multiple declarators; as in:
2289  // __typeof__(a) b,c,d;
2290  std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
2291  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
2292  const char *startBuf = SM->getCharacterData(DeclLoc);
2293  if (ND->getInit()) {
2294  std::string Name(ND->getNameAsString());
2295  TypeAsString += " " + Name + " = ";
2296  Expr *E = ND->getInit();
2297  SourceLocation startLoc;
2298  if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
2299  startLoc = ECE->getLParenLoc();
2300  else
2301  startLoc = E->getBeginLoc();
2302  startLoc = SM->getExpansionLoc(startLoc);
2303  const char *endBuf = SM->getCharacterData(startLoc);
2304  ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2305  }
2306  else {
2307  SourceLocation X = ND->getEndLoc();
2308  X = SM->getExpansionLoc(X);
2309  const char *endBuf = SM->getCharacterData(X);
2310  ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
2311  }
2312 }
2313 
2314 // SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
2315 void RewriteModernObjC::SynthSelGetUidFunctionDecl() {
2316  IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
2318  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2319  QualType getFuncType =
2320  getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
2321  SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2322  SourceLocation(),
2323  SourceLocation(),
2324  SelGetUidIdent, getFuncType,
2325  nullptr, SC_Extern);
2326 }
2327 
2328 void RewriteModernObjC::RewriteFunctionDecl(FunctionDecl *FD) {
2329  // declared in <objc/objc.h>
2330  if (FD->getIdentifier() &&
2331  FD->getName() == "sel_registerName") {
2332  SelGetUidFunctionDecl = FD;
2333  return;
2334  }
2335  RewriteObjCQualifiedInterfaceTypes(FD);
2336 }
2337 
2338 void RewriteModernObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
2339  std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2340  const char *argPtr = TypeString.c_str();
2341  if (!strchr(argPtr, '^')) {
2342  Str += TypeString;
2343  return;
2344  }
2345  while (*argPtr) {
2346  Str += (*argPtr == '^' ? '*' : *argPtr);
2347  argPtr++;
2348  }
2349 }
2350 
2351 // FIXME. Consolidate this routine with RewriteBlockPointerType.
2352 void RewriteModernObjC::RewriteBlockPointerTypeVariable(std::string& Str,
2353  ValueDecl *VD) {
2354  QualType Type = VD->getType();
2355  std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
2356  const char *argPtr = TypeString.c_str();
2357  int paren = 0;
2358  while (*argPtr) {
2359  switch (*argPtr) {
2360  case '(':
2361  Str += *argPtr;
2362  paren++;
2363  break;
2364  case ')':
2365  Str += *argPtr;
2366  paren--;
2367  break;
2368  case '^':
2369  Str += '*';
2370  if (paren == 1)
2371  Str += VD->getNameAsString();
2372  break;
2373  default:
2374  Str += *argPtr;
2375  break;
2376  }
2377  argPtr++;
2378  }
2379 }
2380 
2381 void RewriteModernObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
2382  SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
2383  const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
2384  const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
2385  if (!proto)
2386  return;
2387  QualType Type = proto->getReturnType();
2388  std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
2389  FdStr += " ";
2390  FdStr += FD->getName();
2391  FdStr += "(";
2392  unsigned numArgs = proto->getNumParams();
2393  for (unsigned i = 0; i < numArgs; i++) {
2394  QualType ArgType = proto->getParamType(i);
2395  RewriteBlockPointerType(FdStr, ArgType);
2396  if (i+1 < numArgs)
2397  FdStr += ", ";
2398  }
2399  if (FD->isVariadic()) {
2400  FdStr += (numArgs > 0) ? ", ...);\n" : "...);\n";
2401  }
2402  else
2403  FdStr += ");\n";
2404  InsertText(FunLocStart, FdStr);
2405 }
2406 
2407 // SynthSuperConstructorFunctionDecl - id __rw_objc_super(id obj, id super);
2408 void RewriteModernObjC::SynthSuperConstructorFunctionDecl() {
2409  if (SuperConstructorFunctionDecl)
2410  return;
2411  IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
2413  QualType argT = Context->getObjCIdType();
2414  assert(!argT.isNull() && "Can't find 'id' type");
2415  ArgTys.push_back(argT);
2416  ArgTys.push_back(argT);
2417  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2418  ArgTys);
2419  SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2420  SourceLocation(),
2421  SourceLocation(),
2422  msgSendIdent, msgSendType,
2423  nullptr, SC_Extern);
2424 }
2425 
2426 // SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
2427 void RewriteModernObjC::SynthMsgSendFunctionDecl() {
2428  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
2430  QualType argT = Context->getObjCIdType();
2431  assert(!argT.isNull() && "Can't find 'id' type");
2432  ArgTys.push_back(argT);
2433  argT = Context->getObjCSelType();
2434  assert(!argT.isNull() && "Can't find 'SEL' type");
2435  ArgTys.push_back(argT);
2436  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2437  ArgTys, /*variadic=*/true);
2438  MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2439  SourceLocation(),
2440  SourceLocation(),
2441  msgSendIdent, msgSendType, nullptr,
2442  SC_Extern);
2443 }
2444 
2445 // SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(void);
2446 void RewriteModernObjC::SynthMsgSendSuperFunctionDecl() {
2447  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
2448  SmallVector<QualType, 2> ArgTys;
2449  ArgTys.push_back(Context->VoidTy);
2450  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2451  ArgTys, /*variadic=*/true);
2452  MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2453  SourceLocation(),
2454  SourceLocation(),
2455  msgSendIdent, msgSendType,
2456  nullptr, SC_Extern);
2457 }
2458 
2459 // SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
2460 void RewriteModernObjC::SynthMsgSendStretFunctionDecl() {
2461  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
2463  QualType argT = Context->getObjCIdType();
2464  assert(!argT.isNull() && "Can't find 'id' type");
2465  ArgTys.push_back(argT);
2466  argT = Context->getObjCSelType();
2467  assert(!argT.isNull() && "Can't find 'SEL' type");
2468  ArgTys.push_back(argT);
2469  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2470  ArgTys, /*variadic=*/true);
2471  MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2472  SourceLocation(),
2473  SourceLocation(),
2474  msgSendIdent, msgSendType,
2475  nullptr, SC_Extern);
2476 }
2477 
2478 // SynthMsgSendSuperStretFunctionDecl -
2479 // id objc_msgSendSuper_stret(void);
2480 void RewriteModernObjC::SynthMsgSendSuperStretFunctionDecl() {
2481  IdentifierInfo *msgSendIdent =
2482  &Context->Idents.get("objc_msgSendSuper_stret");
2483  SmallVector<QualType, 2> ArgTys;
2484  ArgTys.push_back(Context->VoidTy);
2485  QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
2486  ArgTys, /*variadic=*/true);
2487  MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2488  SourceLocation(),
2489  SourceLocation(),
2490  msgSendIdent,
2491  msgSendType, nullptr,
2492  SC_Extern);
2493 }
2494 
2495 // SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
2496 void RewriteModernObjC::SynthMsgSendFpretFunctionDecl() {
2497  IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
2499  QualType argT = Context->getObjCIdType();
2500  assert(!argT.isNull() && "Can't find 'id' type");
2501  ArgTys.push_back(argT);
2502  argT = Context->getObjCSelType();
2503  assert(!argT.isNull() && "Can't find 'SEL' type");
2504  ArgTys.push_back(argT);
2505  QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
2506  ArgTys, /*variadic=*/true);
2507  MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2508  SourceLocation(),
2509  SourceLocation(),
2510  msgSendIdent, msgSendType,
2511  nullptr, SC_Extern);
2512 }
2513 
2514 // SynthGetClassFunctionDecl - Class objc_getClass(const char *name);
2515 void RewriteModernObjC::SynthGetClassFunctionDecl() {
2516  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
2518  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2519  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2520  ArgTys);
2521  GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2522  SourceLocation(),
2523  SourceLocation(),
2524  getClassIdent, getClassType,
2525  nullptr, SC_Extern);
2526 }
2527 
2528 // SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
2529 void RewriteModernObjC::SynthGetSuperClassFunctionDecl() {
2530  IdentifierInfo *getSuperClassIdent =
2531  &Context->Idents.get("class_getSuperclass");
2533  ArgTys.push_back(Context->getObjCClassType());
2534  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2535  ArgTys);
2536  GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2537  SourceLocation(),
2538  SourceLocation(),
2539  getSuperClassIdent,
2540  getClassType, nullptr,
2541  SC_Extern);
2542 }
2543 
2544 // SynthGetMetaClassFunctionDecl - Class objc_getMetaClass(const char *name);
2545 void RewriteModernObjC::SynthGetMetaClassFunctionDecl() {
2546  IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
2548  ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
2549  QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
2550  ArgTys);
2551  GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
2552  SourceLocation(),
2553  SourceLocation(),
2554  getClassIdent, getClassType,
2555  nullptr, SC_Extern);
2556 }
2557 
2558 Stmt *RewriteModernObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
2559  assert (Exp != nullptr && "Expected non-null ObjCStringLiteral");
2560  QualType strType = getConstantStringStructType();
2561 
2562  std::string S = "__NSConstantStringImpl_";
2563 
2564  std::string tmpName = InFileName;
2565  unsigned i;
2566  for (i=0; i < tmpName.length(); i++) {
2567  char c = tmpName.at(i);
2568  // replace any non-alphanumeric characters with '_'.
2569  if (!isAlphanumeric(c))
2570  tmpName[i] = '_';
2571  }
2572  S += tmpName;
2573  S += "_";
2574  S += utostr(NumObjCStringLiterals++);
2575 
2576  Preamble += "static __NSConstantStringImpl " + S;
2577  Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
2578  Preamble += "0x000007c8,"; // utf8_str
2579  // The pretty printer for StringLiteral handles escape characters properly.
2580  std::string prettyBufS;
2581  llvm::raw_string_ostream prettyBuf(prettyBufS);
2582  Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
2583  Preamble += prettyBuf.str();
2584  Preamble += ",";
2585  Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
2586 
2587  VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
2588  SourceLocation(), &Context->Idents.get(S),
2589  strType, nullptr, SC_Static);
2590  DeclRefExpr *DRE = new (Context)
2591  DeclRefExpr(*Context, NewVD, false, strType, VK_LValue, SourceLocation());
2592  Expr *Unop = UnaryOperator::Create(
2593  const_cast<ASTContext &>(*Context), DRE, UO_AddrOf,
2594  Context->getPointerType(DRE->getType()), VK_RValue, OK_Ordinary,
2595  SourceLocation(), false, FPOptionsOverride());
2596  // cast to NSConstantString *
2597  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
2598  CK_CPointerToObjCPointerCast, Unop);
2599  ReplaceStmt(Exp, cast);
2600  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
2601  return cast;
2602 }
2603 
2604 Stmt *RewriteModernObjC::RewriteObjCBoolLiteralExpr(ObjCBoolLiteralExpr *Exp) {
2605  unsigned IntSize =
2606  static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
2607 
2608  Expr *FlagExp = IntegerLiteral::Create(*Context,
2609  llvm::APInt(IntSize, Exp->getValue()),
2610  Context->IntTy, Exp->getLocation());
2611  CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Context->ObjCBuiltinBoolTy,
2612  CK_BitCast, FlagExp);
2613  ParenExpr *PE = new (Context) ParenExpr(Exp->getLocation(), Exp->getExprLoc(),
2614  cast);
2615  ReplaceStmt(Exp, PE);
2616  return PE;
2617 }
2618 
2619 Stmt *RewriteModernObjC::RewriteObjCBoxedExpr(ObjCBoxedExpr *Exp) {
2620  // synthesize declaration of helper functions needed in this routine.
2621  if (!SelGetUidFunctionDecl)
2622  SynthSelGetUidFunctionDecl();
2623  // use objc_msgSend() for all.
2624  if (!MsgSendFunctionDecl)
2625  SynthMsgSendFunctionDecl();
2626  if (!GetClassFunctionDecl)
2627  SynthGetClassFunctionDecl();
2628 
2629  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2630  SourceLocation StartLoc = Exp->getBeginLoc();
2631  SourceLocation EndLoc = Exp->getEndLoc();
2632 
2633  // Synthesize a call to objc_msgSend().
2634  SmallVector<Expr*, 4> MsgExprs;
2635  SmallVector<Expr*, 4> ClsExprs;
2636 
2637  // Create a call to objc_getClass("<BoxingClass>"). It will be the 1st argument.
2638  ObjCMethodDecl *BoxingMethod = Exp->getBoxingMethod();
2639  ObjCInterfaceDecl *BoxingClass = BoxingMethod->getClassInterface();
2640 
2641  IdentifierInfo *clsName = BoxingClass->getIdentifier();
2642  ClsExprs.push_back(getStringLiteral(clsName->getName()));
2643  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2644  StartLoc, EndLoc);
2645  MsgExprs.push_back(Cls);
2646 
2647  // Create a call to sel_registerName("<BoxingMethod>:"), etc.
2648  // it will be the 2nd argument.
2649  SmallVector<Expr*, 4> SelExprs;
2650  SelExprs.push_back(
2651  getStringLiteral(BoxingMethod->getSelector().getAsString()));
2652  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2653  SelExprs, StartLoc, EndLoc);
2654  MsgExprs.push_back(SelExp);
2655 
2656  // User provided sub-expression is the 3rd, and last, argument.
2657  Expr *subExpr = Exp->getSubExpr();
2658  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(subExpr)) {
2659  QualType type = ICE->getType();
2660  const Expr *SubExpr = ICE->IgnoreParenImpCasts();
2661  CastKind CK = CK_BitCast;
2662  if (SubExpr->getType()->isIntegralType(*Context) && type->isBooleanType())
2663  CK = CK_IntegralToBoolean;
2664  subExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, subExpr);
2665  }
2666  MsgExprs.push_back(subExpr);
2667 
2668  SmallVector<QualType, 4> ArgTypes;
2669  ArgTypes.push_back(Context->getObjCClassType());
2670  ArgTypes.push_back(Context->getObjCSelType());
2671  for (const auto PI : BoxingMethod->parameters())
2672  ArgTypes.push_back(PI->getType());
2673 
2674  QualType returnType = Exp->getType();
2675  // Get the type, we will need to reference it in a couple spots.
2676  QualType msgSendType = MsgSendFlavor->getType();
2677 
2678  // Create a reference to the objc_msgSend() declaration.
2679  DeclRefExpr *DRE = new (Context) DeclRefExpr(
2680  *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2681 
2682  CastExpr *cast = NoTypeInfoCStyleCastExpr(
2683  Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2684 
2685  // Now do the "normal" pointer to function cast.
2686  QualType castType =
2687  getSimpleFunctionType(returnType, ArgTypes, BoxingMethod->isVariadic());
2688  castType = Context->getPointerType(castType);
2689  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2690  cast);
2691 
2692  // Don't forget the parens to enforce the proper binding.
2693  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2694 
2695  auto *FT = msgSendType->castAs<FunctionType>();
2696  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2697  VK_RValue, EndLoc, FPOptionsOverride());
2698  ReplaceStmt(Exp, CE);
2699  return CE;
2700 }
2701 
2702 Stmt *RewriteModernObjC::RewriteObjCArrayLiteralExpr(ObjCArrayLiteral *Exp) {
2703  // synthesize declaration of helper functions needed in this routine.
2704  if (!SelGetUidFunctionDecl)
2705  SynthSelGetUidFunctionDecl();
2706  // use objc_msgSend() for all.
2707  if (!MsgSendFunctionDecl)
2708  SynthMsgSendFunctionDecl();
2709  if (!GetClassFunctionDecl)
2710  SynthGetClassFunctionDecl();
2711 
2712  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2713  SourceLocation StartLoc = Exp->getBeginLoc();
2714  SourceLocation EndLoc = Exp->getEndLoc();
2715 
2716  // Build the expression: __NSContainer_literal(int, ...).arr
2717  QualType IntQT = Context->IntTy;
2718  QualType NSArrayFType =
2719  getSimpleFunctionType(Context->VoidTy, IntQT, true);
2720  std::string NSArrayFName("__NSContainer_literal");
2721  FunctionDecl *NSArrayFD = SynthBlockInitFunctionDecl(NSArrayFName);
2722  DeclRefExpr *NSArrayDRE = new (Context) DeclRefExpr(
2723  *Context, NSArrayFD, false, NSArrayFType, VK_RValue, SourceLocation());
2724 
2725  SmallVector<Expr*, 16> InitExprs;
2726  unsigned NumElements = Exp->getNumElements();
2727  unsigned UnsignedIntSize =
2728  static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2729  Expr *count = IntegerLiteral::Create(*Context,
2730  llvm::APInt(UnsignedIntSize, NumElements),
2731  Context->UnsignedIntTy, SourceLocation());
2732  InitExprs.push_back(count);
2733  for (unsigned i = 0; i < NumElements; i++)
2734  InitExprs.push_back(Exp->getElement(i));
2735  Expr *NSArrayCallExpr =
2736  CallExpr::Create(*Context, NSArrayDRE, InitExprs, NSArrayFType, VK_LValue,
2738 
2739  FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
2740  SourceLocation(),
2741  &Context->Idents.get("arr"),
2742  Context->getPointerType(Context->VoidPtrTy),
2743  nullptr, /*BitWidth=*/nullptr,
2744  /*Mutable=*/true, ICIS_NoInit);
2745  MemberExpr *ArrayLiteralME =
2746  MemberExpr::CreateImplicit(*Context, NSArrayCallExpr, false, ARRFD,
2747  ARRFD->getType(), VK_LValue, OK_Ordinary);
2748  QualType ConstIdT = Context->getObjCIdType().withConst();
2749  CStyleCastExpr * ArrayLiteralObjects =
2750  NoTypeInfoCStyleCastExpr(Context,
2751  Context->getPointerType(ConstIdT),
2752  CK_BitCast,
2753  ArrayLiteralME);
2754 
2755  // Synthesize a call to objc_msgSend().
2756  SmallVector<Expr*, 32> MsgExprs;
2757  SmallVector<Expr*, 4> ClsExprs;
2758  QualType expType = Exp->getType();
2759 
2760  // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2762  expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
2763 
2764  IdentifierInfo *clsName = Class->getIdentifier();
2765  ClsExprs.push_back(getStringLiteral(clsName->getName()));
2766  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2767  StartLoc, EndLoc);
2768  MsgExprs.push_back(Cls);
2769 
2770  // Create a call to sel_registerName("arrayWithObjects:count:").
2771  // it will be the 2nd argument.
2772  SmallVector<Expr*, 4> SelExprs;
2773  ObjCMethodDecl *ArrayMethod = Exp->getArrayWithObjectsMethod();
2774  SelExprs.push_back(
2775  getStringLiteral(ArrayMethod->getSelector().getAsString()));
2776  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2777  SelExprs, StartLoc, EndLoc);
2778  MsgExprs.push_back(SelExp);
2779 
2780  // (const id [])objects
2781  MsgExprs.push_back(ArrayLiteralObjects);
2782 
2783  // (NSUInteger)cnt
2784  Expr *cnt = IntegerLiteral::Create(*Context,
2785  llvm::APInt(UnsignedIntSize, NumElements),
2786  Context->UnsignedIntTy, SourceLocation());
2787  MsgExprs.push_back(cnt);
2788 
2789  SmallVector<QualType, 4> ArgTypes;
2790  ArgTypes.push_back(Context->getObjCClassType());
2791  ArgTypes.push_back(Context->getObjCSelType());
2792  for (const auto *PI : ArrayMethod->parameters())
2793  ArgTypes.push_back(PI->getType());
2794 
2795  QualType returnType = Exp->getType();
2796  // Get the type, we will need to reference it in a couple spots.
2797  QualType msgSendType = MsgSendFlavor->getType();
2798 
2799  // Create a reference to the objc_msgSend() declaration.
2800  DeclRefExpr *DRE = new (Context) DeclRefExpr(
2801  *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2802 
2803  CastExpr *cast = NoTypeInfoCStyleCastExpr(
2804  Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2805 
2806  // Now do the "normal" pointer to function cast.
2807  QualType castType =
2808  getSimpleFunctionType(returnType, ArgTypes, ArrayMethod->isVariadic());
2809  castType = Context->getPointerType(castType);
2810  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2811  cast);
2812 
2813  // Don't forget the parens to enforce the proper binding.
2814  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2815 
2816  const FunctionType *FT = msgSendType->castAs<FunctionType>();
2817  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2818  VK_RValue, EndLoc, FPOptionsOverride());
2819  ReplaceStmt(Exp, CE);
2820  return CE;
2821 }
2822 
2823 Stmt *RewriteModernObjC::RewriteObjCDictionaryLiteralExpr(ObjCDictionaryLiteral *Exp) {
2824  // synthesize declaration of helper functions needed in this routine.
2825  if (!SelGetUidFunctionDecl)
2826  SynthSelGetUidFunctionDecl();
2827  // use objc_msgSend() for all.
2828  if (!MsgSendFunctionDecl)
2829  SynthMsgSendFunctionDecl();
2830  if (!GetClassFunctionDecl)
2831  SynthGetClassFunctionDecl();
2832 
2833  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
2834  SourceLocation StartLoc = Exp->getBeginLoc();
2835  SourceLocation EndLoc = Exp->getEndLoc();
2836 
2837  // Build the expression: __NSContainer_literal(int, ...).arr
2838  QualType IntQT = Context->IntTy;
2839  QualType NSDictFType =
2840  getSimpleFunctionType(Context->VoidTy, IntQT, true);
2841  std::string NSDictFName("__NSContainer_literal");
2842  FunctionDecl *NSDictFD = SynthBlockInitFunctionDecl(NSDictFName);
2843  DeclRefExpr *NSDictDRE = new (Context) DeclRefExpr(
2844  *Context, NSDictFD, false, NSDictFType, VK_RValue, SourceLocation());
2845 
2846  SmallVector<Expr*, 16> KeyExprs;
2847  SmallVector<Expr*, 16> ValueExprs;
2848 
2849  unsigned NumElements = Exp->getNumElements();
2850  unsigned UnsignedIntSize =
2851  static_cast<unsigned>(Context->getTypeSize(Context->UnsignedIntTy));
2852  Expr *count = IntegerLiteral::Create(*Context,
2853  llvm::APInt(UnsignedIntSize, NumElements),
2854  Context->UnsignedIntTy, SourceLocation());
2855  KeyExprs.push_back(count);
2856  ValueExprs.push_back(count);
2857  for (unsigned i = 0; i < NumElements; i++) {
2858  ObjCDictionaryElement Element = Exp->getKeyValueElement(i);
2859  KeyExprs.push_back(Element.Key);
2860  ValueExprs.push_back(Element.Value);
2861  }
2862 
2863  // (const id [])objects
2864  Expr *NSValueCallExpr =
2865  CallExpr::Create(*Context, NSDictDRE, ValueExprs, NSDictFType, VK_LValue,
2867 
2868  FieldDecl *ARRFD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
2869  SourceLocation(),
2870  &Context->Idents.get("arr"),
2871  Context->getPointerType(Context->VoidPtrTy),
2872  nullptr, /*BitWidth=*/nullptr,
2873  /*Mutable=*/true, ICIS_NoInit);
2874  MemberExpr *DictLiteralValueME =
2875  MemberExpr::CreateImplicit(*Context, NSValueCallExpr, false, ARRFD,
2876  ARRFD->getType(), VK_LValue, OK_Ordinary);
2877  QualType ConstIdT = Context->getObjCIdType().withConst();
2878  CStyleCastExpr * DictValueObjects =
2879  NoTypeInfoCStyleCastExpr(Context,
2880  Context->getPointerType(ConstIdT),
2881  CK_BitCast,
2882  DictLiteralValueME);
2883  // (const id <NSCopying> [])keys
2884  Expr *NSKeyCallExpr =
2885  CallExpr::Create(*Context, NSDictDRE, KeyExprs, NSDictFType, VK_LValue,
2887 
2888  MemberExpr *DictLiteralKeyME =
2889  MemberExpr::CreateImplicit(*Context, NSKeyCallExpr, false, ARRFD,
2890  ARRFD->getType(), VK_LValue, OK_Ordinary);
2891 
2892  CStyleCastExpr * DictKeyObjects =
2893  NoTypeInfoCStyleCastExpr(Context,
2894  Context->getPointerType(ConstIdT),
2895  CK_BitCast,
2896  DictLiteralKeyME);
2897 
2898  // Synthesize a call to objc_msgSend().
2899  SmallVector<Expr*, 32> MsgExprs;
2900  SmallVector<Expr*, 4> ClsExprs;
2901  QualType expType = Exp->getType();
2902 
2903  // Create a call to objc_getClass("NSArray"). It will be th 1st argument.
2905  expType->getPointeeType()->castAs<ObjCObjectType>()->getInterface();
2906 
2907  IdentifierInfo *clsName = Class->getIdentifier();
2908  ClsExprs.push_back(getStringLiteral(clsName->getName()));
2909  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
2910  StartLoc, EndLoc);
2911  MsgExprs.push_back(Cls);
2912 
2913  // Create a call to sel_registerName("arrayWithObjects:count:").
2914  // it will be the 2nd argument.
2915  SmallVector<Expr*, 4> SelExprs;
2916  ObjCMethodDecl *DictMethod = Exp->getDictWithObjectsMethod();
2917  SelExprs.push_back(getStringLiteral(DictMethod->getSelector().getAsString()));
2918  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
2919  SelExprs, StartLoc, EndLoc);
2920  MsgExprs.push_back(SelExp);
2921 
2922  // (const id [])objects
2923  MsgExprs.push_back(DictValueObjects);
2924 
2925  // (const id <NSCopying> [])keys
2926  MsgExprs.push_back(DictKeyObjects);
2927 
2928  // (NSUInteger)cnt
2929  Expr *cnt = IntegerLiteral::Create(*Context,
2930  llvm::APInt(UnsignedIntSize, NumElements),
2931  Context->UnsignedIntTy, SourceLocation());
2932  MsgExprs.push_back(cnt);
2933 
2934  SmallVector<QualType, 8> ArgTypes;
2935  ArgTypes.push_back(Context->getObjCClassType());
2936  ArgTypes.push_back(Context->getObjCSelType());
2937  for (const auto *PI : DictMethod->parameters()) {
2938  QualType T = PI->getType();
2939  if (const PointerType* PT = T->getAs<PointerType>()) {
2940  QualType PointeeTy = PT->getPointeeType();
2941  convertToUnqualifiedObjCType(PointeeTy);
2942  T = Context->getPointerType(PointeeTy);
2943  }
2944  ArgTypes.push_back(T);
2945  }
2946 
2947  QualType returnType = Exp->getType();
2948  // Get the type, we will need to reference it in a couple spots.
2949  QualType msgSendType = MsgSendFlavor->getType();
2950 
2951  // Create a reference to the objc_msgSend() declaration.
2952  DeclRefExpr *DRE = new (Context) DeclRefExpr(
2953  *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
2954 
2955  CastExpr *cast = NoTypeInfoCStyleCastExpr(
2956  Context, Context->getPointerType(Context->VoidTy), CK_BitCast, DRE);
2957 
2958  // Now do the "normal" pointer to function cast.
2959  QualType castType =
2960  getSimpleFunctionType(returnType, ArgTypes, DictMethod->isVariadic());
2961  castType = Context->getPointerType(castType);
2962  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
2963  cast);
2964 
2965  // Don't forget the parens to enforce the proper binding.
2966  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
2967 
2968  const FunctionType *FT = msgSendType->castAs<FunctionType>();
2969  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
2970  VK_RValue, EndLoc, FPOptionsOverride());
2971  ReplaceStmt(Exp, CE);
2972  return CE;
2973 }
2974 
2975 // struct __rw_objc_super {
2976 // struct objc_object *object; struct objc_object *superClass;
2977 // };
2978 QualType RewriteModernObjC::getSuperStructType() {
2979  if (!SuperStructDecl) {
2980  SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
2982  &Context->Idents.get("__rw_objc_super"));
2983  QualType FieldTypes[2];
2984 
2985  // struct objc_object *object;
2986  FieldTypes[0] = Context->getObjCIdType();
2987  // struct objc_object *superClass;
2988  FieldTypes[1] = Context->getObjCIdType();
2989 
2990  // Create fields
2991  for (unsigned i = 0; i < 2; ++i) {
2992  SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
2993  SourceLocation(),
2994  SourceLocation(), nullptr,
2995  FieldTypes[i], nullptr,
2996  /*BitWidth=*/nullptr,
2997  /*Mutable=*/false,
2998  ICIS_NoInit));
2999  }
3000 
3001  SuperStructDecl->completeDefinition();
3002  }
3003  return Context->getTagDeclType(SuperStructDecl);
3004 }
3005 
3006 QualType RewriteModernObjC::getConstantStringStructType() {
3007  if (!ConstantStringDecl) {
3008  ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
3010  &Context->Idents.get("__NSConstantStringImpl"));
3011  QualType FieldTypes[4];
3012 
3013  // struct objc_object *receiver;
3014  FieldTypes[0] = Context->getObjCIdType();
3015  // int flags;
3016  FieldTypes[1] = Context->IntTy;
3017  // char *str;
3018  FieldTypes[2] = Context->getPointerType(Context->CharTy);
3019  // long length;
3020  FieldTypes[3] = Context->LongTy;
3021 
3022  // Create fields
3023  for (unsigned i = 0; i < 4; ++i) {
3024  ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
3025  ConstantStringDecl,
3026  SourceLocation(),
3027  SourceLocation(), nullptr,
3028  FieldTypes[i], nullptr,
3029  /*BitWidth=*/nullptr,
3030  /*Mutable=*/true,
3031  ICIS_NoInit));
3032  }
3033 
3034  ConstantStringDecl->completeDefinition();
3035  }
3036  return Context->getTagDeclType(ConstantStringDecl);
3037 }
3038 
3039 /// getFunctionSourceLocation - returns start location of a function
3040 /// definition. Complication arises when function has declared as
3041 /// extern "C" or extern "C" {...}
3042 static SourceLocation getFunctionSourceLocation (RewriteModernObjC &R,
3043  FunctionDecl *FD) {
3044  if (FD->isExternC() && !FD->isMain()) {
3045  const DeclContext *DC = FD->getDeclContext();
3046  if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3047  // if it is extern "C" {...}, return function decl's own location.
3048  if (!LSD->getRBraceLoc().isValid())
3049  return LSD->getExternLoc();
3050  }
3051  if (FD->getStorageClass() != SC_None)
3052  R.RewriteBlockLiteralFunctionDecl(FD);
3053  return FD->getTypeSpecStartLoc();
3054 }
3055 
3056 void RewriteModernObjC::RewriteLineDirective(const Decl *D) {
3057 
3058  SourceLocation Location = D->getLocation();
3059 
3060  if (Location.isFileID() && GenerateLineInfo) {
3061  std::string LineString("\n#line ");
3062  PresumedLoc PLoc = SM->getPresumedLoc(Location);
3063  LineString += utostr(PLoc.getLine());
3064  LineString += " \"";
3065  LineString += Lexer::Stringify(PLoc.getFilename());
3066  if (isa<ObjCMethodDecl>(D))
3067  LineString += "\"";
3068  else LineString += "\"\n";
3069 
3070  Location = D->getBeginLoc();
3071  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
3072  if (FD->isExternC() && !FD->isMain()) {
3073  const DeclContext *DC = FD->getDeclContext();
3074  if (const LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(DC))
3075  // if it is extern "C" {...}, return function decl's own location.
3076  if (!LSD->getRBraceLoc().isValid())
3077  Location = LSD->getExternLoc();
3078  }
3079  }
3080  InsertText(Location, LineString);
3081  }
3082 }
3083 
3084 /// SynthMsgSendStretCallExpr - This routine translates message expression
3085 /// into a call to objc_msgSend_stret() entry point. Tricky part is that
3086 /// nil check on receiver must be performed before calling objc_msgSend_stret.
3087 /// MsgSendStretFlavor - function declaration objc_msgSend_stret(...)
3088 /// msgSendType - function type of objc_msgSend_stret(...)
3089 /// returnType - Result type of the method being synthesized.
3090 /// ArgTypes - type of the arguments passed to objc_msgSend_stret, starting with receiver type.
3091 /// MsgExprs - list of argument expressions being passed to objc_msgSend_stret,
3092 /// starting with receiver.
3093 /// Method - Method being rewritten.
3094 Expr *RewriteModernObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
3095  QualType returnType,
3096  SmallVectorImpl<QualType> &ArgTypes,
3097  SmallVectorImpl<Expr*> &MsgExprs,
3098  ObjCMethodDecl *Method) {
3099  // Now do the "normal" pointer to function cast.
3100  QualType FuncType = getSimpleFunctionType(
3101  returnType, ArgTypes, Method ? Method->isVariadic() : false);
3102  QualType castType = Context->getPointerType(FuncType);
3103 
3104  // build type for containing the objc_msgSend_stret object.
3105  static unsigned stretCount=0;
3106  std::string name = "__Stret"; name += utostr(stretCount);
3107  std::string str =
3108  "extern \"C\" void * __cdecl memset(void *_Dst, int _Val, size_t _Size);\n";
3109  str += "namespace {\n";
3110  str += "struct "; str += name;
3111  str += " {\n\t";
3112  str += name;
3113  str += "(id receiver, SEL sel";
3114  for (unsigned i = 2; i < ArgTypes.size(); i++) {
3115  std::string ArgName = "arg"; ArgName += utostr(i);
3116  ArgTypes[i].getAsStringInternal(ArgName, Context->getPrintingPolicy());
3117  str += ", "; str += ArgName;
3118  }
3119  // could be vararg.
3120  for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3121  std::string ArgName = "arg"; ArgName += utostr(i);
3122  MsgExprs[i]->getType().getAsStringInternal(ArgName,
3123  Context->getPrintingPolicy());
3124  str += ", "; str += ArgName;
3125  }
3126 
3127  str += ") {\n";
3128  str += "\t unsigned size = sizeof(";
3129  str += returnType.getAsString(Context->getPrintingPolicy()); str += ");\n";
3130 
3131  str += "\t if (size == 1 || size == 2 || size == 4 || size == 8)\n";
3132 
3133  str += "\t s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3134  str += ")(void *)objc_msgSend)(receiver, sel";
3135  for (unsigned i = 2; i < ArgTypes.size(); i++) {
3136  str += ", arg"; str += utostr(i);
3137  }
3138  // could be vararg.
3139  for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3140  str += ", arg"; str += utostr(i);
3141  }
3142  str+= ");\n";
3143 
3144  str += "\t else if (receiver == 0)\n";
3145  str += "\t memset((void*)&s, 0, sizeof(s));\n";
3146  str += "\t else\n";
3147 
3148  str += "\t s = (("; str += castType.getAsString(Context->getPrintingPolicy());
3149  str += ")(void *)objc_msgSend_stret)(receiver, sel";
3150  for (unsigned i = 2; i < ArgTypes.size(); i++) {
3151  str += ", arg"; str += utostr(i);
3152  }
3153  // could be vararg.
3154  for (unsigned i = ArgTypes.size(); i < MsgExprs.size(); i++) {
3155  str += ", arg"; str += utostr(i);
3156  }
3157  str += ");\n";
3158 
3159  str += "\t}\n";
3160  str += "\t"; str += returnType.getAsString(Context->getPrintingPolicy());
3161  str += " s;\n";
3162  str += "};\n};\n\n";
3163  SourceLocation FunLocStart;
3164  if (CurFunctionDef)
3165  FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
3166  else {
3167  assert(CurMethodDef && "SynthMsgSendStretCallExpr - CurMethodDef is null");
3168  FunLocStart = CurMethodDef->getBeginLoc();
3169  }
3170 
3171  InsertText(FunLocStart, str);
3172  ++stretCount;
3173 
3174  // AST for __Stretn(receiver, args).s;
3175  IdentifierInfo *ID = &Context->Idents.get(name);
3176  FunctionDecl *FD =
3177  FunctionDecl::Create(*Context, TUDecl, SourceLocation(), SourceLocation(),
3178  ID, FuncType, nullptr, SC_Extern, false, false);
3179  DeclRefExpr *DRE = new (Context)
3180  DeclRefExpr(*Context, FD, false, castType, VK_RValue, SourceLocation());
3181  CallExpr *STCE =
3182  CallExpr::Create(*Context, DRE, MsgExprs, castType, VK_LValue,
3184 
3185  FieldDecl *FieldD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
3186  SourceLocation(),
3187  &Context->Idents.get("s"),
3188  returnType, nullptr,
3189  /*BitWidth=*/nullptr,
3190  /*Mutable=*/true, ICIS_NoInit);
3191  MemberExpr *ME = MemberExpr::CreateImplicit(
3192  *Context, STCE, false, FieldD, FieldD->getType(), VK_LValue, OK_Ordinary);
3193 
3194  return ME;
3195 }
3196 
3197 Stmt *RewriteModernObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
3198  SourceLocation StartLoc,
3199  SourceLocation EndLoc) {
3200  if (!SelGetUidFunctionDecl)
3201  SynthSelGetUidFunctionDecl();
3202  if (!MsgSendFunctionDecl)
3203  SynthMsgSendFunctionDecl();
3204  if (!MsgSendSuperFunctionDecl)
3205  SynthMsgSendSuperFunctionDecl();
3206  if (!MsgSendStretFunctionDecl)
3207  SynthMsgSendStretFunctionDecl();
3208  if (!MsgSendSuperStretFunctionDecl)
3209  SynthMsgSendSuperStretFunctionDecl();
3210  if (!MsgSendFpretFunctionDecl)
3211  SynthMsgSendFpretFunctionDecl();
3212  if (!GetClassFunctionDecl)
3213  SynthGetClassFunctionDecl();
3214  if (!GetSuperClassFunctionDecl)
3215  SynthGetSuperClassFunctionDecl();
3216  if (!GetMetaClassFunctionDecl)
3217  SynthGetMetaClassFunctionDecl();
3218 
3219  // default to objc_msgSend().
3220  FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
3221  // May need to use objc_msgSend_stret() as well.
3222  FunctionDecl *MsgSendStretFlavor = nullptr;
3223  if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
3224  QualType resultType = mDecl->getReturnType();
3225  if (resultType->isRecordType())
3226  MsgSendStretFlavor = MsgSendStretFunctionDecl;
3227  else if (resultType->isRealFloatingType())
3228  MsgSendFlavor = MsgSendFpretFunctionDecl;
3229  }
3230 
3231  // Synthesize a call to objc_msgSend().
3232  SmallVector<Expr*, 8> MsgExprs;
3233  switch (Exp->getReceiverKind()) {
3234  case ObjCMessageExpr::SuperClass: {
3235  MsgSendFlavor = MsgSendSuperFunctionDecl;
3236  if (MsgSendStretFlavor)
3237  MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3238  assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3239 
3240  ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3241 
3242  SmallVector<Expr*, 4> InitExprs;
3243 
3244  // set the receiver to self, the first argument to all methods.
3245  InitExprs.push_back(
3246  NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3247  CK_BitCast,
3248  new (Context) DeclRefExpr(*Context,
3249  CurMethodDef->getSelfDecl(),
3250  false,
3251  Context->getObjCIdType(),
3252  VK_RValue,
3253  SourceLocation()))
3254  ); // set the 'receiver'.
3255 
3256  // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3257  SmallVector<Expr*, 8> ClsExprs;
3258  ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3259  // (Class)objc_getClass("CurrentClass")
3260  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
3261  ClsExprs, StartLoc, EndLoc);
3262  ClsExprs.clear();
3263  ClsExprs.push_back(Cls);
3264  Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
3265  StartLoc, EndLoc);
3266 
3267  // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3268  // To turn off a warning, type-cast to 'id'
3269  InitExprs.push_back( // set 'super class', using class_getSuperclass().
3270  NoTypeInfoCStyleCastExpr(Context,
3271  Context->getObjCIdType(),
3272  CK_BitCast, Cls));
3273  // struct __rw_objc_super
3274  QualType superType = getSuperStructType();
3275  Expr *SuperRep;
3276 
3277  if (LangOpts.MicrosoftExt) {
3278  SynthSuperConstructorFunctionDecl();
3279  // Simulate a constructor call...
3280  DeclRefExpr *DRE = new (Context)
3281  DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3283  SuperRep =
3284  CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
3286  // The code for super is a little tricky to prevent collision with
3287  // the structure definition in the header. The rewriter has it's own
3288  // internal definition (__rw_objc_super) that is uses. This is why
3289  // we need the cast below. For example:
3290  // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3291  //
3292  SuperRep = UnaryOperator::Create(
3293  const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
3294  Context->getPointerType(SuperRep->getType()), VK_RValue, OK_Ordinary,
3295  SourceLocation(), false, FPOptionsOverride());
3296  SuperRep = NoTypeInfoCStyleCastExpr(Context,
3297  Context->getPointerType(superType),
3298  CK_BitCast, SuperRep);
3299  } else {
3300  // (struct __rw_objc_super) { <exprs from above> }
3301  InitListExpr *ILE =
3302  new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3303  SourceLocation());
3304  TypeSourceInfo *superTInfo
3305  = Context->getTrivialTypeSourceInfo(superType);
3306  SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3307  superType, VK_LValue,
3308  ILE, false);
3309  // struct __rw_objc_super *
3310  SuperRep = UnaryOperator::Create(
3311  const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
3312  Context->getPointerType(SuperRep->getType()), VK_RValue, OK_Ordinary,
3313  SourceLocation(), false, FPOptionsOverride());
3314  }
3315  MsgExprs.push_back(SuperRep);
3316  break;
3317  }
3318 
3319  case ObjCMessageExpr::Class: {
3320  SmallVector<Expr*, 8> ClsExprs;
3322  = Exp->getClassReceiver()->castAs<ObjCObjectType>()->getInterface();
3323  IdentifierInfo *clsName = Class->getIdentifier();
3324  ClsExprs.push_back(getStringLiteral(clsName->getName()));
3325  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
3326  StartLoc, EndLoc);
3327  CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
3328  Context->getObjCIdType(),
3329  CK_BitCast, Cls);
3330  MsgExprs.push_back(ArgExpr);
3331  break;
3332  }
3333 
3334  case ObjCMessageExpr::SuperInstance:{
3335  MsgSendFlavor = MsgSendSuperFunctionDecl;
3336  if (MsgSendStretFlavor)
3337  MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
3338  assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
3339  ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
3340  SmallVector<Expr*, 4> InitExprs;
3341 
3342  InitExprs.push_back(
3343  NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3344  CK_BitCast,
3345  new (Context) DeclRefExpr(*Context,
3346  CurMethodDef->getSelfDecl(),
3347  false,
3348  Context->getObjCIdType(),
3350  ); // set the 'receiver'.
3351 
3352  // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3353  SmallVector<Expr*, 8> ClsExprs;
3354  ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
3355  // (Class)objc_getClass("CurrentClass")
3356  CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl, ClsExprs,
3357  StartLoc, EndLoc);
3358  ClsExprs.clear();
3359  ClsExprs.push_back(Cls);
3360  Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl, ClsExprs,
3361  StartLoc, EndLoc);
3362 
3363  // (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
3364  // To turn off a warning, type-cast to 'id'
3365  InitExprs.push_back(
3366  // set 'super class', using class_getSuperclass().
3367  NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3368  CK_BitCast, Cls));
3369  // struct __rw_objc_super
3370  QualType superType = getSuperStructType();
3371  Expr *SuperRep;
3372 
3373  if (LangOpts.MicrosoftExt) {
3374  SynthSuperConstructorFunctionDecl();
3375  // Simulate a constructor call...
3376  DeclRefExpr *DRE = new (Context)
3377  DeclRefExpr(*Context, SuperConstructorFunctionDecl, false, superType,
3379  SuperRep =
3380  CallExpr::Create(*Context, DRE, InitExprs, superType, VK_LValue,
3382  // The code for super is a little tricky to prevent collision with
3383  // the structure definition in the header. The rewriter has it's own
3384  // internal definition (__rw_objc_super) that is uses. This is why
3385  // we need the cast below. For example:
3386  // (struct __rw_objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
3387  //
3388  SuperRep = UnaryOperator::Create(
3389  const_cast<ASTContext &>(*Context), SuperRep, UO_AddrOf,
3390  Context->getPointerType(SuperRep->getType()), VK_RValue, OK_Ordinary,
3391  SourceLocation(), false, FPOptionsOverride());
3392  SuperRep = NoTypeInfoCStyleCastExpr(Context,
3393  Context->getPointerType(superType),
3394  CK_BitCast, SuperRep);
3395  } else {
3396  // (struct __rw_objc_super) { <exprs from above> }
3397  InitListExpr *ILE =
3398  new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
3399  SourceLocation());
3400  TypeSourceInfo *superTInfo
3401  = Context->getTrivialTypeSourceInfo(superType);
3402  SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
3403  superType, VK_RValue, ILE,
3404  false);
3405  }
3406  MsgExprs.push_back(SuperRep);
3407  break;
3408  }
3409 
3410  case ObjCMessageExpr::Instance: {
3411  // Remove all type-casts because it may contain objc-style types; e.g.
3412  // Foo<Proto> *.
3413  Expr *recExpr = Exp->getInstanceReceiver();
3414  while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
3415  recExpr = CE->getSubExpr();
3416  CastKind CK = recExpr->getType()->isObjCObjectPointerType()
3417  ? CK_BitCast : recExpr->getType()->isBlockPointerType()
3418  ? CK_BlockPointerToObjCPointerCast
3419  : CK_CPointerToObjCPointerCast;
3420 
3421  recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3422  CK, recExpr);
3423  MsgExprs.push_back(recExpr);
3424  break;
3425  }
3426  }
3427 
3428  // Create a call to sel_registerName("selName"), it will be the 2nd argument.
3429  SmallVector<Expr*, 8> SelExprs;
3430  SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
3431  CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
3432  SelExprs, StartLoc, EndLoc);
3433  MsgExprs.push_back(SelExp);
3434 
3435  // Now push any user supplied arguments.
3436  for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
3437  Expr *userExpr = Exp->getArg(i);
3438  // Make all implicit casts explicit...ICE comes in handy:-)
3439  if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
3440  // Reuse the ICE type, it is exactly what the doctor ordered.
3441  QualType type = ICE->getType();
3442  if (needToScanForQualifiers(type))
3443  type = Context->getObjCIdType();
3444  // Make sure we convert "type (^)(...)" to "type (*)(...)".
3445  (void)convertBlockPointerToFunctionPointer(type);
3446  const Expr *SubExpr = ICE->IgnoreParenImpCasts();
3447  CastKind CK;
3448  if (SubExpr->getType()->isIntegralType(*Context) &&
3449  type->isBooleanType()) {
3450  CK = CK_IntegralToBoolean;
3451  } else if (type->isObjCObjectPointerType()) {
3452  if (SubExpr->getType()->isBlockPointerType()) {
3453  CK = CK_BlockPointerToObjCPointerCast;
3454  } else if (SubExpr->getType()->isPointerType()) {
3455  CK = CK_CPointerToObjCPointerCast;
3456  } else {
3457  CK = CK_BitCast;
3458  }
3459  } else {
3460  CK = CK_BitCast;
3461  }
3462 
3463  userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, userExpr);
3464  }
3465  // Make id<P...> cast into an 'id' cast.
3466  else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
3467  if (CE->getType()->isObjCQualifiedIdType()) {
3468  while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
3469  userExpr = CE->getSubExpr();
3470  CastKind CK;
3471  if (userExpr->getType()->isIntegralType(*Context)) {
3472  CK = CK_IntegralToPointer;
3473  } else if (userExpr->getType()->isBlockPointerType()) {
3474  CK = CK_BlockPointerToObjCPointerCast;
3475  } else if (userExpr->getType()->isPointerType()) {
3476  CK = CK_CPointerToObjCPointerCast;
3477  } else {
3478  CK = CK_BitCast;
3479  }
3480  userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
3481  CK, userExpr);
3482  }
3483  }
3484  MsgExprs.push_back(userExpr);
3485  // We've transferred the ownership to MsgExprs. For now, we *don't* null
3486  // out the argument in the original expression (since we aren't deleting
3487  // the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
3488  //Exp->setArg(i, 0);
3489  }
3490  // Generate the funky cast.
3491  CastExpr *cast;
3492  SmallVector<QualType, 8> ArgTypes;
3493  QualType returnType;
3494 
3495  // Push 'id' and 'SEL', the 2 implicit arguments.
3496  if (MsgSendFlavor == MsgSendSuperFunctionDecl)
3497  ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
3498  else
3499  ArgTypes.push_back(Context->getObjCIdType());
3500  ArgTypes.push_back(Context->getObjCSelType());
3501  if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
3502  // Push any user argument types.
3503  for (const auto *PI : OMD->parameters()) {
3504  QualType t = PI->getType()->isObjCQualifiedIdType()
3505  ? Context->getObjCIdType()
3506  : PI->getType();
3507  // Make sure we convert "t (^)(...)" to "t (*)(...)".
3508  (void)convertBlockPointerToFunctionPointer(t);
3509  ArgTypes.push_back(t);
3510  }
3511  returnType = Exp->getType();
3512  convertToUnqualifiedObjCType(returnType);
3513  (void)convertBlockPointerToFunctionPointer(returnType);
3514  } else {
3515  returnType = Context->getObjCIdType();
3516  }
3517  // Get the type, we will need to reference it in a couple spots.
3518  QualType msgSendType = MsgSendFlavor->getType();
3519 
3520  // Create a reference to the objc_msgSend() declaration.
3521  DeclRefExpr *DRE = new (Context) DeclRefExpr(
3522  *Context, MsgSendFlavor, false, msgSendType, VK_LValue, SourceLocation());
3523 
3524  // Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
3525  // If we don't do this cast, we get the following bizarre warning/note:
3526  // xx.m:13: warning: function called through a non-compatible type
3527  // xx.m:13: note: if this code is reached, the program will abort
3528  cast = NoTypeInfoCStyleCastExpr(Context,
3529  Context->getPointerType(Context->VoidTy),
3530  CK_BitCast, DRE);
3531 
3532  // Now do the "normal" pointer to function cast.
3533  // If we don't have a method decl, force a variadic cast.
3534  const ObjCMethodDecl *MD = Exp->getMethodDecl();
3535  QualType castType =
3536  getSimpleFunctionType(returnType, ArgTypes, MD ? MD->isVariadic() : true);
3537  castType = Context->getPointerType(castType);
3538  cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
3539  cast);
3540 
3541  // Don't forget the parens to enforce the proper binding.
3542  ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
3543 
3544  const FunctionType *FT = msgSendType->castAs<FunctionType>();
3545  CallExpr *CE = CallExpr::Create(*Context, PE, MsgExprs, FT->getReturnType(),
3546  VK_RValue, EndLoc, FPOptionsOverride());
3547  Stmt *ReplacingStmt = CE;
3548  if (MsgSendStretFlavor) {
3549  // We have the method which returns a struct/union. Must also generate
3550  // call to objc_msgSend_stret and hang both varieties on a conditional
3551  // expression which dictate which one to envoke depending on size of
3552  // method's return type.
3553 
3554  Expr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
3555  returnType,
3556  ArgTypes, MsgExprs,
3557  Exp->getMethodDecl());
3558  ReplacingStmt = STCE;
3559  }
3560  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3561  return ReplacingStmt;
3562 }
3563 
3564 Stmt *RewriteModernObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
3565  Stmt *ReplacingStmt =
3566  SynthMessageExpr(Exp, Exp->getBeginLoc(), Exp->getEndLoc());
3567 
3568  // Now do the actual rewrite.
3569  ReplaceStmt(Exp, ReplacingStmt);
3570 
3571  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3572  return ReplacingStmt;
3573 }
3574 
3575 // typedef struct objc_object Protocol;
3576 QualType RewriteModernObjC::getProtocolType() {
3577  if (!ProtocolTypeDecl) {
3578  TypeSourceInfo *TInfo
3579  = Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
3580  ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
3582  &Context->Idents.get("Protocol"),
3583  TInfo);
3584  }
3585  return Context->getTypeDeclType(ProtocolTypeDecl);
3586 }
3587 
3588 /// RewriteObjCProtocolExpr - Rewrite a protocol expression into
3589 /// a synthesized/forward data reference (to the protocol's metadata).
3590 /// The forward references (and metadata) are generated in
3591 /// RewriteModernObjC::HandleTranslationUnit().
3592 Stmt *RewriteModernObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
3593  std::string Name = "_OBJC_PROTOCOL_REFERENCE_$_" +
3594  Exp->getProtocol()->getNameAsString();
3595  IdentifierInfo *ID = &Context->Idents.get(Name);
3596  VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
3597  SourceLocation(), ID, getProtocolType(),
3598  nullptr, SC_Extern);
3599  DeclRefExpr *DRE = new (Context) DeclRefExpr(
3600  *Context, VD, false, getProtocolType(), VK_LValue, SourceLocation());
3601  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(
3602  Context, Context->getPointerType(DRE->getType()), CK_BitCast, DRE);
3603  ReplaceStmt(Exp, castExpr);
3604  ProtocolExprDecls.insert(Exp->getProtocol()->getCanonicalDecl());
3605  // delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
3606  return castExpr;
3607 }
3608 
3609 /// IsTagDefinedInsideClass - This routine checks that a named tagged type
3610 /// is defined inside an objective-c class. If so, it returns true.
3611 bool RewriteModernObjC::IsTagDefinedInsideClass(ObjCContainerDecl *IDecl,
3612  TagDecl *Tag,
3613  bool &IsNamedDefinition) {
3614  if (!IDecl)
3615  return false;
3616  SourceLocation TagLocation;
3617  if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag)) {
3618  RD = RD->getDefinition();
3619  if (!RD || !RD->getDeclName().getAsIdentifierInfo())
3620  return false;
3621  IsNamedDefinition = true;
3622  TagLocation = RD->getLocation();
3623  return Context->getSourceManager().isBeforeInTranslationUnit(
3624  IDecl->getLocation(), TagLocation);
3625  }
3626  if (EnumDecl *ED = dyn_cast<EnumDecl>(Tag)) {
3627  if (!ED || !ED->getDeclName().getAsIdentifierInfo())
3628  return false;
3629  IsNamedDefinition = true;
3630  TagLocation = ED->getLocation();
3631  return Context->getSourceManager().isBeforeInTranslationUnit(
3632  IDecl->getLocation(), TagLocation);
3633  }
3634  return false;
3635 }
3636 
3637 /// RewriteObjCFieldDeclType - This routine rewrites a type into the buffer.
3638 /// It handles elaborated types, as well as enum types in the process.
3639 bool RewriteModernObjC::RewriteObjCFieldDeclType(QualType &Type,
3640  std::string &Result) {
3641  if (isa<TypedefType>(Type)) {
3642  Result += "\t";
3643  return false;
3644  }
3645 
3646  if (Type->isArrayType()) {
3647  QualType ElemTy = Context->getBaseElementType(Type);
3648  return RewriteObjCFieldDeclType(ElemTy, Result);
3649  }
3650  else if (Type->isRecordType()) {
3651  RecordDecl *RD = Type->castAs<RecordType>()->getDecl();
3652  if (RD->isCompleteDefinition()) {
3653  if (RD->isStruct())
3654  Result += "\n\tstruct ";
3655  else if (RD->isUnion())
3656  Result += "\n\tunion ";
3657  else
3658  assert(false && "class not allowed as an ivar type");
3659 
3660  Result += RD->getName();
3661  if (GlobalDefinedTags.count(RD)) {
3662  // struct/union is defined globally, use it.
3663  Result += " ";
3664  return true;
3665  }
3666  Result += " {\n";
3667  for (auto *FD : RD->fields())
3668  RewriteObjCFieldDecl(FD, Result);
3669  Result += "\t} ";
3670  return true;
3671  }
3672  }
3673  else if (Type->isEnumeralType()) {
3674  EnumDecl *ED = Type->castAs<EnumType>()->getDecl();
3675  if (ED->isCompleteDefinition()) {
3676  Result += "\n\tenum ";
3677  Result += ED->getName();
3678  if (GlobalDefinedTags.count(ED)) {
3679  // Enum is globall defined, use it.
3680  Result += " ";
3681  return true;
3682  }
3683 
3684  Result += " {\n";
3685  for (const auto *EC : ED->enumerators()) {
3686  Result += "\t"; Result += EC->getName(); Result += " = ";
3687  llvm::APSInt Val = EC->getInitVal();
3688  Result += Val.toString(10);
3689  Result += ",\n";
3690  }
3691  Result += "\t} ";
3692  return true;
3693  }
3694  }
3695 
3696  Result += "\t";
3697  convertObjCTypeToCStyleType(Type);
3698  return false;
3699 }
3700 
3701 
3702 /// RewriteObjCFieldDecl - This routine rewrites a field into the buffer.
3703 /// It handles elaborated types, as well as enum types in the process.
3704 void RewriteModernObjC::RewriteObjCFieldDecl(FieldDecl *fieldDecl,
3705  std::string &Result) {
3706  QualType Type = fieldDecl->getType();
3707  std::string Name = fieldDecl->getNameAsString();
3708 
3709  bool EleboratedType = RewriteObjCFieldDeclType(Type, Result);
3710  if (!EleboratedType)
3711  Type.getAsStringInternal(Name, Context->getPrintingPolicy());
3712  Result += Name;
3713  if (fieldDecl->isBitField()) {
3714  Result += " : "; Result += utostr(fieldDecl->getBitWidthValue(*Context));
3715  }
3716  else if (EleboratedType && Type->isArrayType()) {
3717  const ArrayType *AT = Context->getAsArrayType(Type);
3718  do {
3719  if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(AT)) {
3720  Result += "[";
3721  llvm::APInt Dim = CAT->getSize();
3722  Result += utostr(Dim.getZExtValue());
3723  Result += "]";
3724  }
3725  AT = Context->getAsArrayType(AT->getElementType());
3726  } while (AT);
3727  }
3728 
3729  Result += ";\n";
3730 }
3731 
3732 /// RewriteLocallyDefinedNamedAggregates - This routine rewrites locally defined
3733 /// named aggregate types into the input buffer.
3734 void RewriteModernObjC::RewriteLocallyDefinedNamedAggregates(FieldDecl *fieldDecl,
3735  std::string &Result) {
3736  QualType Type = fieldDecl->getType();
3737  if (isa<TypedefType>(Type))
3738  return;
3739  if (Type->isArrayType())
3740  Type = Context->getBaseElementType(Type);
3741 
3742  auto *IDecl = dyn_cast<ObjCContainerDecl>(fieldDecl->getDeclContext());
3743 
3744  TagDecl *TD = nullptr;
3745  if (Type->isRecordType()) {
3746  TD = Type->castAs<RecordType>()->getDecl();
3747  }
3748  else if (Type->isEnumeralType()) {
3749  TD = Type->castAs<EnumType>()->getDecl();
3750  }
3751 
3752  if (TD) {
3753  if (GlobalDefinedTags.count(TD))
3754  return;
3755 
3756  bool IsNamedDefinition = false;
3757  if (IsTagDefinedInsideClass(IDecl, TD, IsNamedDefinition)) {
3758  RewriteObjCFieldDeclType(Type, Result);
3759  Result += ";";
3760  }
3761  if (IsNamedDefinition)
3762  GlobalDefinedTags.insert(TD);
3763  }
3764 }
3765 
3766 unsigned RewriteModernObjC::ObjCIvarBitfieldGroupNo(ObjCIvarDecl *IV) {
3767  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3768  if (ObjCInterefaceHasBitfieldGroups.count(CDecl)) {
3769  return IvarGroupNumber[IV];
3770  }
3771  unsigned GroupNo = 0;
3773  for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3774  IVD; IVD = IVD->getNextIvar())
3775  IVars.push_back(IVD);
3776 
3777  for (unsigned i = 0, e = IVars.size(); i < e; i++)
3778  if (IVars[i]->isBitField()) {
3779  IvarGroupNumber[IVars[i++]] = ++GroupNo;
3780  while (i < e && IVars[i]->isBitField())
3781  IvarGroupNumber[IVars[i++]] = GroupNo;
3782  if (i < e)
3783  --i;
3784  }
3785 
3786  ObjCInterefaceHasBitfieldGroups.insert(CDecl);
3787  return IvarGroupNumber[IV];
3788 }
3789 
3790 QualType RewriteModernObjC::SynthesizeBitfieldGroupStructType(
3791  ObjCIvarDecl *IV,
3793  std::string StructTagName;
3794  ObjCIvarBitfieldGroupType(IV, StructTagName);
3795  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct,
3796  Context->getTranslationUnitDecl(),
3798  &Context->Idents.get(StructTagName));
3799  for (unsigned i=0, e = IVars.size(); i < e; i++) {
3800  ObjCIvarDecl *Ivar = IVars[i];
3801  RD->addDecl(FieldDecl::Create(*Context, RD, SourceLocation(), SourceLocation(),
3802  &Context->Idents.get(Ivar->getName()),
3803  Ivar->getType(),
3804  nullptr, /*Expr *BW */Ivar->getBitWidth(),
3805  false, ICIS_NoInit));
3806  }
3807  RD->completeDefinition();
3808  return Context->getTagDeclType(RD);
3809 }
3810 
3811 QualType RewriteModernObjC::GetGroupRecordTypeForObjCIvarBitfield(ObjCIvarDecl *IV) {
3812  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3813  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3814  std::pair<const ObjCInterfaceDecl*, unsigned> tuple = std::make_pair(CDecl, GroupNo);
3815  if (GroupRecordType.count(tuple))
3816  return GroupRecordType[tuple];
3817 
3819  for (const ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3820  IVD; IVD = IVD->getNextIvar()) {
3821  if (IVD->isBitField())
3822  IVars.push_back(const_cast<ObjCIvarDecl *>(IVD));
3823  else {
3824  if (!IVars.empty()) {
3825  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3826  // Generate the struct type for this group of bitfield ivars.
3827  GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3828  SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3829  IVars.clear();
3830  }
3831  }
3832  }
3833  if (!IVars.empty()) {
3834  // Do the last one.
3835  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IVars[0]);
3836  GroupRecordType[std::make_pair(CDecl, GroupNo)] =
3837  SynthesizeBitfieldGroupStructType(IVars[0], IVars);
3838  }
3839  QualType RetQT = GroupRecordType[tuple];
3840  assert(!RetQT.isNull() && "GetGroupRecordTypeForObjCIvarBitfield struct type is NULL");
3841 
3842  return RetQT;
3843 }
3844 
3845 /// ObjCIvarBitfieldGroupDecl - Names field decl. for ivar bitfield group.
3846 /// Name would be: classname__GRBF_n where n is the group number for this ivar.
3847 void RewriteModernObjC::ObjCIvarBitfieldGroupDecl(ObjCIvarDecl *IV,
3848  std::string &Result) {
3849  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3850  Result += CDecl->getName();
3851  Result += "__GRBF_";
3852  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3853  Result += utostr(GroupNo);
3854 }
3855 
3856 /// ObjCIvarBitfieldGroupType - Names struct type for ivar bitfield group.
3857 /// Name of the struct would be: classname__T_n where n is the group number for
3858 /// this ivar.
3859 void RewriteModernObjC::ObjCIvarBitfieldGroupType(ObjCIvarDecl *IV,
3860  std::string &Result) {
3861  const ObjCInterfaceDecl *CDecl = IV->getContainingInterface();
3862  Result += CDecl->getName();
3863  Result += "__T_";
3864  unsigned GroupNo = ObjCIvarBitfieldGroupNo(IV);
3865  Result += utostr(GroupNo);
3866 }
3867 
3868 /// ObjCIvarBitfieldGroupOffset - Names symbol for ivar bitfield group field offset.
3869 /// Name would be: OBJC_IVAR_$_classname__GRBF_n where n is the group number for
3870 /// this ivar.
3871 void RewriteModernObjC::ObjCIvarBitfieldGroupOffset(ObjCIvarDecl *IV,
3872  std::string &Result) {
3873  Result += "OBJC_IVAR_$_";
3874  ObjCIvarBitfieldGroupDecl(IV, Result);
3875 }
3876 
3877 #define SKIP_BITFIELDS(IX, ENDIX, VEC) { \
3878  while ((IX < ENDIX) && VEC[IX]->isBitField()) \
3879  ++IX; \
3880  if (IX < ENDIX) \
3881  --IX; \
3882 }
3883 
3884 /// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
3885 /// an objective-c class with ivars.
3886 void RewriteModernObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
3887  std::string &Result) {
3888  assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
3889  assert(CDecl->getName() != "" &&
3890  "Name missing in SynthesizeObjCInternalStruct");
3891  ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
3893  for (ObjCIvarDecl *IVD = CDecl->all_declared_ivar_begin();
3894  IVD; IVD = IVD->getNextIvar())
3895  IVars.push_back(IVD);
3896 
3897  SourceLocation LocStart = CDecl->getBeginLoc();
3898  SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
3899 
3900  const char *startBuf = SM->getCharacterData(LocStart);
3901  const char *endBuf = SM->getCharacterData(LocEnd);
3902 
3903  // If no ivars and no root or if its root, directly or indirectly,
3904  // have no ivars (thus not synthesized) then no need to synthesize this class.
3905  if ((!CDecl->isThisDeclarationADefinition() || IVars.size() == 0) &&
3906  (!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
3907  endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
3908  ReplaceText(LocStart, endBuf-startBuf, Result);
3909  return;
3910  }
3911 
3912  // Insert named struct/union definitions inside class to
3913  // outer scope. This follows semantics of locally defined
3914  // struct/unions in objective-c classes.
3915  for (unsigned i = 0, e = IVars.size(); i < e; i++)
3916  RewriteLocallyDefinedNamedAggregates(IVars[i], Result);
3917 
3918  // Insert named structs which are syntheized to group ivar bitfields
3919  // to outer scope as well.
3920  for (unsigned i = 0, e = IVars.size(); i < e; i++)
3921  if (IVars[i]->isBitField()) {
3922  ObjCIvarDecl *IV = IVars[i];
3923  QualType QT = GetGroupRecordTypeForObjCIvarBitfield(IV);
3924  RewriteObjCFieldDeclType(QT, Result);
3925  Result += ";";
3926  // skip over ivar bitfields in this group.
3927  SKIP_BITFIELDS(i , e, IVars);
3928  }
3929 
3930  Result += "\nstruct ";
3931  Result += CDecl->getNameAsString();
3932  Result += "_IMPL {\n";
3933 
3934  if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
3935  Result += "\tstruct "; Result += RCDecl->getNameAsString();
3936  Result += "_IMPL "; Result += RCDecl->getNameAsString();
3937  Result += "_IVARS;\n";
3938  }
3939 
3940  for (unsigned i = 0, e = IVars.size(); i < e; i++) {
3941  if (IVars[i]->isBitField()) {
3942  ObjCIvarDecl *IV = IVars[i];
3943  Result += "\tstruct ";
3944  ObjCIvarBitfieldGroupType(IV, Result); Result += " ";
3945  ObjCIvarBitfieldGroupDecl(IV, Result); Result += ";\n";
3946  // skip over ivar bitfields in this group.
3947  SKIP_BITFIELDS(i , e, IVars);
3948  }
3949  else
3950  RewriteObjCFieldDecl(IVars[i], Result);
3951  }
3952 
3953  Result += "};\n";
3954  endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
3955  ReplaceText(LocStart, endBuf-startBuf, Result);
3956  // Mark this struct as having been generated.
3957  if (!ObjCSynthesizedStructs.insert(CDecl).second)
3958  llvm_unreachable("struct already synthesize- RewriteObjCInternalStruct");
3959 }
3960 
3961 /// RewriteIvarOffsetSymbols - Rewrite ivar offset symbols of those ivars which
3962 /// have been referenced in an ivar access expression.
3963 void RewriteModernObjC::RewriteIvarOffsetSymbols(ObjCInterfaceDecl *CDecl,
3964  std::string &Result) {
3965  // write out ivar offset symbols which have been referenced in an ivar
3966  // access expression.
3967  llvm::SmallSetVector<ObjCIvarDecl *, 8> Ivars = ReferencedIvars[CDecl];
3968 
3969  if (Ivars.empty())
3970  return;
3971 
3973  for (ObjCIvarDecl *IvarDecl : Ivars) {
3974  const ObjCInterfaceDecl *IDecl = IvarDecl->getContainingInterface();
3975  unsigned GroupNo = 0;
3976  if (IvarDecl->isBitField()) {
3977  GroupNo = ObjCIvarBitfieldGroupNo(IvarDecl);
3978  if (GroupSymbolOutput.count(std::make_pair(IDecl, GroupNo)))
3979  continue;
3980  }
3981  Result += "\n";
3982  if (LangOpts.MicrosoftExt)
3983  Result += "__declspec(allocate(\".objc_ivar$B\")) ";
3984  Result += "extern \"C\" ";
3985  if (LangOpts.MicrosoftExt &&
3986  IvarDecl->getAccessControl() != ObjCIvarDecl::Private &&
3987  IvarDecl->getAccessControl() != ObjCIvarDecl::Package)
3988  Result += "__declspec(dllimport) ";
3989 
3990  Result += "unsigned long ";
3991  if (IvarDecl->isBitField()) {
3992  ObjCIvarBitfieldGroupOffset(IvarDecl, Result);
3993  GroupSymbolOutput.insert(std::make_pair(IDecl, GroupNo));
3994  }
3995  else
3996  WriteInternalIvarName(CDecl, IvarDecl, Result);
3997  Result += ";";
3998  }
3999 }
4000 
4001 //===----------------------------------------------------------------------===//
4002 // Meta Data Emission
4003 //===----------------------------------------------------------------------===//
4004 
4005 /// RewriteImplementations - This routine rewrites all method implementations
4006 /// and emits meta-data.
4007 
4008 void RewriteModernObjC::RewriteImplementations() {
4009  int ClsDefCount = ClassImplementation.size();
4010  int CatDefCount = CategoryImplementation.size();
4011 
4012  // Rewrite implemented methods
4013  for (int i = 0; i < ClsDefCount; i++) {
4014  ObjCImplementationDecl *OIMP = ClassImplementation[i];
4015  ObjCInterfaceDecl *CDecl = OIMP->getClassInterface();
4016  if (CDecl->isImplicitInterfaceDecl())
4017  assert(false &&
4018  "Legacy implicit interface rewriting not supported in moder abi");
4019  RewriteImplementationDecl(OIMP);
4020  }
4021 
4022  for (int i = 0; i < CatDefCount; i++) {
4023  ObjCCategoryImplDecl *CIMP = CategoryImplementation[i];
4024  ObjCInterfaceDecl *CDecl = CIMP->getClassInterface();
4025  if (CDecl->isImplicitInterfaceDecl())
4026  assert(false &&
4027  "Legacy implicit interface rewriting not supported in moder abi");
4028  RewriteImplementationDecl(CIMP);
4029  }
4030 }
4031 
4032 void RewriteModernObjC::RewriteByRefString(std::string &ResultStr,
4033  const std::string &Name,
4034  ValueDecl *VD, bool def) {
4035  assert(BlockByRefDeclNo.count(VD) &&
4036  "RewriteByRefString: ByRef decl missing");
4037  if (def)
4038  ResultStr += "struct ";
4039  ResultStr += "__Block_byref_" + Name +
4040  "_" + utostr(BlockByRefDeclNo[VD]) ;
4041 }
4042 
4044  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4045  return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
4046  return false;
4047 }
4048 
4049 std::string RewriteModernObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
4050  StringRef funcName,
4051  std::string Tag) {
4052  const FunctionType *AFT = CE->getFunctionType();
4053  QualType RT = AFT->getReturnType();
4054  std::string StructRef = "struct " + Tag;
4055  SourceLocation BlockLoc = CE->getExprLoc();
4056  std::string S;
4057  ConvertSourceLocationToLineDirective(BlockLoc, S);
4058 
4059  S += "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
4060  funcName.str() + "_block_func_" + utostr(i);
4061 
4062  BlockDecl *BD = CE->getBlockDecl();
4063 
4064  if (isa<FunctionNoProtoType>(AFT)) {
4065  // No user-supplied arguments. Still need to pass in a pointer to the
4066  // block (to reference imported block decl refs).
4067  S += "(" + StructRef + " *__cself)";
4068  } else if (BD->param_empty()) {
4069  S += "(" + StructRef + " *__cself)";
4070  } else {
4071  const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
4072  assert(FT && "SynthesizeBlockFunc: No function proto");
4073  S += '(';
4074  // first add the implicit argument.
4075  S += StructRef + " *__cself, ";
4076  std::string ParamStr;
4077  for (BlockDecl::param_iterator AI = BD->param_begin(),
4078  E = BD->param_end(); AI != E; ++AI) {
4079  if (AI != BD->param_begin()) S += ", ";
4080  ParamStr = (*AI)->getNameAsString();
4081  QualType QT = (*AI)->getType();
4082  (void)convertBlockPointerToFunctionPointer(QT);
4083  QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
4084  S += ParamStr;
4085  }
4086  if (FT->isVariadic()) {
4087  if (!BD->param_empty()) S += ", ";
4088  S += "...";
4089  }
4090  S += ')';
4091  }
4092  S += " {\n";
4093 
4094  // Create local declarations to avoid rewriting all closure decl ref exprs.
4095  // First, emit a declaration for all "by ref" decls.
4096  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4097  E = BlockByRefDecls.end(); I != E; ++I) {
4098  S += " ";
4099  std::string Name = (*I)->getNameAsString();
4100  std::string TypeString;
4101  RewriteByRefString(TypeString, Name, (*I));
4102  TypeString += " *";
4103  Name = TypeString + Name;
4104  S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
4105  }
4106  // Next, emit a declaration for all "by copy" declarations.
4107  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4108  E = BlockByCopyDecls.end(); I != E; ++I) {
4109  S += " ";
4110  // Handle nested closure invocation. For example:
4111  //
4112  // void (^myImportedClosure)(void);
4113  // myImportedClosure = ^(void) { setGlobalInt(x + y); };
4114  //
4115  // void (^anotherClosure)(void);
4116  // anotherClosure = ^(void) {
4117  // myImportedClosure(); // import and invoke the closure
4118  // };
4119  //
4120  if (isTopLevelBlockPointerType((*I)->getType())) {
4121  RewriteBlockPointerTypeVariable(S, (*I));
4122  S += " = (";
4123  RewriteBlockPointerType(S, (*I)->getType());
4124  S += ")";
4125  S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
4126  }
4127  else {
4128  std::string Name = (*I)->getNameAsString();
4129  QualType QT = (*I)->getType();
4131  QT = Context->getPointerType(QT);
4132  QT.getAsStringInternal(Name, Context->getPrintingPolicy());
4133  S += Name + " = __cself->" +
4134  (*I)->getNameAsString() + "; // bound by copy\n";
4135  }
4136  }
4137  std::string RewrittenStr = RewrittenBlockExprs[CE];
4138  const char *cstr = RewrittenStr.c_str();
4139  while (*cstr++ != '{') ;
4140  S += cstr;
4141  S += "\n";
4142  return S;
4143 }
4144 
4145 std::string RewriteModernObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
4146  StringRef funcName,
4147  std::string Tag) {
4148  std::string StructRef = "struct " + Tag;
4149  std::string S = "static void __";
4150 
4151  S += funcName;
4152  S += "_block_copy_" + utostr(i);
4153  S += "(" + StructRef;
4154  S += "*dst, " + StructRef;
4155  S += "*src) {";
4156  for (ValueDecl *VD : ImportedBlockDecls) {
4157  S += "_Block_object_assign((void*)&dst->";
4158  S += VD->getNameAsString();
4159  S += ", (void*)src->";
4160  S += VD->getNameAsString();
4161  if (BlockByRefDeclsPtrSet.count(VD))
4162  S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4163  else if (VD->getType()->isBlockPointerType())
4164  S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4165  else
4166  S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4167  }
4168  S += "}\n";
4169 
4170  S += "\nstatic void __";
4171  S += funcName;
4172  S += "_block_dispose_" + utostr(i);
4173  S += "(" + StructRef;
4174  S += "*src) {";
4175  for (ValueDecl *VD : ImportedBlockDecls) {
4176  S += "_Block_object_dispose((void*)src->";
4177  S += VD->getNameAsString();
4178  if (BlockByRefDeclsPtrSet.count(VD))
4179  S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
4180  else if (VD->getType()->isBlockPointerType())
4181  S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
4182  else
4183  S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
4184  }
4185  S += "}\n";
4186  return S;
4187 }
4188 
4189 std::string RewriteModernObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
4190  std::string Desc) {
4191  std::string S = "\nstruct " + Tag;
4192  std::string Constructor = " " + Tag;
4193 
4194  S += " {\n struct __block_impl impl;\n";
4195  S += " struct " + Desc;
4196  S += "* Desc;\n";
4197 
4198  Constructor += "(void *fp, "; // Invoke function pointer.
4199  Constructor += "struct " + Desc; // Descriptor pointer.
4200  Constructor += " *desc";
4201 
4202  if (BlockDeclRefs.size()) {
4203  // Output all "by copy" declarations.
4204  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4205  E = BlockByCopyDecls.end(); I != E; ++I) {
4206  S += " ";
4207  std::string FieldName = (*I)->getNameAsString();
4208  std::string ArgName = "_" + FieldName;
4209  // Handle nested closure invocation. For example:
4210  //
4211  // void (^myImportedBlock)(void);
4212  // myImportedBlock = ^(void) { setGlobalInt(x + y); };
4213  //
4214  // void (^anotherBlock)(void);
4215  // anotherBlock = ^(void) {
4216  // myImportedBlock(); // import and invoke the closure
4217  // };
4218  //
4219  if (isTopLevelBlockPointerType((*I)->getType())) {
4220  S += "struct __block_impl *";
4221  Constructor += ", void *" + ArgName;
4222  } else {
4223  QualType QT = (*I)->getType();
4225  QT = Context->getPointerType(QT);
4226  QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
4227  QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
4228  Constructor += ", " + ArgName;
4229  }
4230  S += FieldName + ";\n";
4231  }
4232  // Output all "by ref" declarations.
4233  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4234  E = BlockByRefDecls.end(); I != E; ++I) {
4235  S += " ";
4236  std::string FieldName = (*I)->getNameAsString();
4237  std::string ArgName = "_" + FieldName;
4238  {
4239  std::string TypeString;
4240  RewriteByRefString(TypeString, FieldName, (*I));
4241  TypeString += " *";
4242  FieldName = TypeString + FieldName;
4243  ArgName = TypeString + ArgName;
4244  Constructor += ", " + ArgName;
4245  }
4246  S += FieldName + "; // by ref\n";
4247  }
4248  // Finish writing the constructor.
4249  Constructor += ", int flags=0)";
4250  // Initialize all "by copy" arguments.
4251  bool firsTime = true;
4252  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
4253  E = BlockByCopyDecls.end(); I != E; ++I) {
4254  std::string Name = (*I)->getNameAsString();
4255  if (firsTime) {
4256  Constructor += " : ";
4257  firsTime = false;
4258  }
4259  else
4260  Constructor += ", ";
4261  if (isTopLevelBlockPointerType((*I)->getType()))
4262  Constructor += Name + "((struct __block_impl *)_" + Name + ")";
4263  else
4264  Constructor += Name + "(_" + Name + ")";
4265  }
4266  // Initialize all "by ref" arguments.
4267  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
4268  E = BlockByRefDecls.end(); I != E; ++I) {
4269  std::string Name = (*I)->getNameAsString();
4270  if (firsTime) {
4271  Constructor += " : ";
4272  firsTime = false;
4273  }
4274  else
4275  Constructor += ", ";
4276  Constructor += Name + "(_" + Name + "->__forwarding)";
4277  }
4278 
4279  Constructor += " {\n";
4280  if (GlobalVarDecl)
4281  Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4282  else
4283  Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4284  Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4285 
4286  Constructor += " Desc = desc;\n";
4287  } else {
4288  // Finish writing the constructor.
4289  Constructor += ", int flags=0) {\n";
4290  if (GlobalVarDecl)
4291  Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
4292  else
4293  Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
4294  Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
4295  Constructor += " Desc = desc;\n";
4296  }
4297  Constructor += " ";
4298  Constructor += "}\n";
4299  S += Constructor;
4300  S += "};\n";
4301  return S;
4302 }
4303 
4304 std::string RewriteModernObjC::SynthesizeBlockDescriptor(std::string DescTag,
4305  std::string ImplTag, int i,
4306  StringRef FunName,
4307  unsigned hasCopy) {
4308  std::string S = "\nstatic struct " + DescTag;
4309 
4310  S += " {\n size_t reserved;\n";
4311  S += " size_t Block_size;\n";
4312  if (hasCopy) {
4313  S += " void (*copy)(struct ";
4314  S += ImplTag; S += "*, struct ";
4315  S += ImplTag; S += "*);\n";
4316 
4317  S += " void (*dispose)(struct ";
4318  S += ImplTag; S += "*);\n";
4319  }
4320  S += "} ";
4321 
4322  S += DescTag + "_DATA = { 0, sizeof(struct ";
4323  S += ImplTag + ")";
4324  if (hasCopy) {
4325  S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
4326  S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
4327  }
4328  S += "};\n";
4329  return S;
4330 }
4331 
4332 void RewriteModernObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
4333  StringRef FunName) {
4334  bool RewriteSC = (GlobalVarDecl &&
4335  !Blocks.empty() &&
4336  GlobalVarDecl->getStorageClass() == SC_Static &&
4337  GlobalVarDecl->getType().getCVRQualifiers());
4338  if (RewriteSC) {
4339  std::string SC(" void __");
4340  SC += GlobalVarDecl->getNameAsString();
4341  SC += "() {}";
4342  InsertText(FunLocStart, SC);
4343  }
4344 
4345  // Insert closures that were part of the function.
4346  for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
4347  CollectBlockDeclRefInfo(Blocks[i]);
4348  // Need to copy-in the inner copied-in variables not actually used in this
4349  // block.
4350  for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
4351  DeclRefExpr *Exp = InnerDeclRefs[count++];
4352  ValueDecl *VD = Exp->getDecl();
4353  BlockDeclRefs.push_back(Exp);
4354  if (!VD->hasAttr<BlocksAttr>()) {
4355  if (!BlockByCopyDeclsPtrSet.count(VD)) {
4356  BlockByCopyDeclsPtrSet.insert(VD);
4357  BlockByCopyDecls.push_back(VD);
4358  }
4359  continue;
4360  }
4361 
4362  if (!BlockByRefDeclsPtrSet.count(VD)) {
4363  BlockByRefDeclsPtrSet.insert(VD);
4364  BlockByRefDecls.push_back(VD);
4365  }
4366 
4367  // imported objects in the inner blocks not used in the outer
4368  // blocks must be copied/disposed in the outer block as well.
4369  if (VD->getType()->isObjCObjectPointerType() ||
4370  VD->getType()->isBlockPointerType())
4371  ImportedBlockDecls.insert(VD);
4372  }
4373 
4374  std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
4375  std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
4376 
4377  std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
4378 
4379  InsertText(FunLocStart, CI);
4380 
4381  std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
4382 
4383  InsertText(FunLocStart, CF);
4384 
4385  if (ImportedBlockDecls.size()) {
4386  std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
4387  InsertText(FunLocStart, HF);
4388  }
4389  std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
4390  ImportedBlockDecls.size() > 0);
4391  InsertText(FunLocStart, BD);
4392 
4393  BlockDeclRefs.clear();
4394  BlockByRefDecls.clear();
4395  BlockByRefDeclsPtrSet.clear();
4396  BlockByCopyDecls.clear();
4397  BlockByCopyDeclsPtrSet.clear();
4398  ImportedBlockDecls.clear();
4399  }
4400  if (RewriteSC) {
4401  // Must insert any 'const/volatile/static here. Since it has been
4402  // removed as result of rewriting of block literals.
4403  std::string SC;
4404  if (GlobalVarDecl->getStorageClass() == SC_Static)
4405  SC = "static ";
4406  if (GlobalVarDecl->getType().isConstQualified())
4407  SC += "const ";
4408  if (GlobalVarDecl->getType().isVolatileQualified())
4409  SC += "volatile ";
4410  if (GlobalVarDecl->getType().isRestrictQualified())
4411  SC += "restrict ";
4412  InsertText(FunLocStart, SC);
4413  }
4414  if (GlobalConstructionExp) {
4415  // extra fancy dance for global literal expression.
4416 
4417  // Always the latest block expression on the block stack.
4418  std::string Tag = "__";
4419  Tag += FunName;
4420  Tag += "_block_impl_";
4421  Tag += utostr(Blocks.size()-1);
4422  std::string globalBuf = "static ";
4423  globalBuf += Tag; globalBuf += " ";
4424  std::string SStr;
4425 
4426  llvm::raw_string_ostream constructorExprBuf(SStr);
4427  GlobalConstructionExp->printPretty(constructorExprBuf, nullptr,
4428  PrintingPolicy(LangOpts));
4429  globalBuf += constructorExprBuf.str();
4430  globalBuf += ";\n";
4431  InsertText(FunLocStart, globalBuf);
4432  GlobalConstructionExp = nullptr;
4433  }
4434 
4435  Blocks.clear();
4436  InnerDeclRefsCount.clear();
4437  InnerDeclRefs.clear();
4438  RewrittenBlockExprs.clear();
4439 }
4440 
4441 void RewriteModernObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
4442  SourceLocation FunLocStart =
4443  (!Blocks.empty()) ? getFunctionSourceLocation(*this, FD)
4444  : FD->getTypeSpecStartLoc();
4445  StringRef FuncName = FD->getName();
4446 
4447  SynthesizeBlockLiterals(FunLocStart, FuncName);
4448 }
4449 
4451  ObjCMethodDecl *MD) {
4452  ObjCInterfaceDecl *IFace = MD->getClassInterface();
4453  Name = std::string(IFace->getName());
4454  Name += "__" + MD->getSelector().getAsString();
4455  // Convert colons to underscores.
4456  std::string::size_type loc = 0;
4457  while ((loc = Name.find(':', loc)) != std::string::npos)
4458  Name.replace(loc, 1, "_");
4459 }
4460 
4461 void RewriteModernObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
4462  // fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
4463  // SourceLocation FunLocStart = MD->getBeginLoc();
4464  SourceLocation FunLocStart = MD->getBeginLoc();
4465  std::string FuncName;
4466  BuildUniqueMethodName(FuncName, MD);
4467  SynthesizeBlockLiterals(FunLocStart, FuncName);
4468 }
4469 
4470 void RewriteModernObjC::GetBlockDeclRefExprs(Stmt *S) {
4471  for (Stmt *SubStmt : S->children())
4472  if (SubStmt) {
4473  if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt))
4474  GetBlockDeclRefExprs(CBE->getBody());
4475  else
4476  GetBlockDeclRefExprs(SubStmt);
4477  }
4478  // Handle specific things.
4479  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
4482  // FIXME: Handle enums.
4483  BlockDeclRefs.push_back(DRE);
4484 }
4485 
4486 void RewriteModernObjC::GetInnerBlockDeclRefExprs(Stmt *S,
4487  SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
4488  llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
4489  for (Stmt *SubStmt : S->children())
4490  if (SubStmt) {
4491  if (BlockExpr *CBE = dyn_cast<BlockExpr>(SubStmt)) {
4492  InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
4493  GetInnerBlockDeclRefExprs(CBE->getBody(),
4494  InnerBlockDeclRefs,
4495  InnerContexts);
4496  }
4497  else
4498  GetInnerBlockDeclRefExprs(SubStmt, InnerBlockDeclRefs, InnerContexts);
4499  }
4500  // Handle specific things.
4501  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
4504  if (!InnerContexts.count(DRE->getDecl()->getDeclContext()))
4505  InnerBlockDeclRefs.push_back(DRE);
4506  if (VarDecl *Var = cast<VarDecl>(DRE->getDecl()))
4507  if (Var->isFunctionOrMethodVarDecl())
4508  ImportedLocalExternalDecls.insert(Var);
4509  }
4510  }
4511 }
4512 
4513 /// convertObjCTypeToCStyleType - This routine converts such objc types
4514 /// as qualified objects, and blocks to their closest c/c++ types that
4515 /// it can. It returns true if input type was modified.
4516 bool RewriteModernObjC::convertObjCTypeToCStyleType(QualType &T) {
4517  QualType oldT = T;
4518  convertBlockPointerToFunctionPointer(T);
4519  if (T->isFunctionPointerType()) {
4520  QualType PointeeTy;
4521  if (const PointerType* PT = T->getAs<PointerType>()) {
4522  PointeeTy = PT->getPointeeType();
4523  if (const FunctionType *FT = PointeeTy->getAs<FunctionType>()) {
4524  T = convertFunctionTypeOfBlocks(FT);
4525  T = Context->getPointerType(T);
4526  }
4527  }
4528  }
4529 
4530  convertToUnqualifiedObjCType(T);
4531  return T != oldT;
4532 }
4533 
4534 /// convertFunctionTypeOfBlocks - This routine converts a function type
4535 /// whose result type may be a block pointer or whose argument type(s)
4536 /// might be block pointers to an equivalent function type replacing
4537 /// all block pointers to function pointers.
4538 QualType RewriteModernObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
4539  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4540  // FTP will be null for closures that don't take arguments.
4541  // Generate a funky cast.
4542  SmallVector<QualType, 8> ArgTypes;
4543  QualType Res = FT->getReturnType();
4544  bool modified = convertObjCTypeToCStyleType(Res);
4545 
4546  if (FTP) {
4547  for (auto &I : FTP->param_types()) {
4548  QualType t = I;
4549  // Make sure we convert "t (^)(...)" to "t (*)(...)".
4550  if (convertObjCTypeToCStyleType(t))
4551  modified = true;
4552  ArgTypes.push_back(t);
4553  }
4554  }
4555  QualType FuncType;
4556  if (modified)
4557  FuncType = getSimpleFunctionType(Res, ArgTypes);
4558  else FuncType = QualType(FT, 0);
4559  return FuncType;
4560 }
4561 
4562 Stmt *RewriteModernObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
4563  // Navigate to relevant type information.
4564  const BlockPointerType *CPT = nullptr;
4565 
4566  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
4567  CPT = DRE->getType()->getAs<BlockPointerType>();
4568  } else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
4569  CPT = MExpr->getType()->getAs<BlockPointerType>();
4570  }
4571  else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
4572  return SynthesizeBlockCall(Exp, PRE->getSubExpr());
4573  }
4574  else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
4575  CPT = IEXPR->getType()->getAs<BlockPointerType>();
4576  else if (const ConditionalOperator *CEXPR =
4577  dyn_cast<ConditionalOperator>(BlockExp)) {
4578  Expr *LHSExp = CEXPR->getLHS();
4579  Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
4580  Expr *RHSExp = CEXPR->getRHS();
4581  Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
4582  Expr *CONDExp = CEXPR->getCond();
4583  ConditionalOperator *CondExpr =
4584  new (Context) ConditionalOperator(CONDExp,
4585  SourceLocation(), cast<Expr>(LHSStmt),
4586  SourceLocation(), cast<Expr>(RHSStmt),
4587  Exp->getType(), VK_RValue, OK_Ordinary);
4588  return CondExpr;
4589  } else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
4590  CPT = IRE->getType()->getAs<BlockPointerType>();
4591  } else if (const PseudoObjectExpr *POE
4592  = dyn_cast<PseudoObjectExpr>(BlockExp)) {
4593  CPT = POE->getType()->castAs<BlockPointerType>();
4594  } else {
4595  assert(false && "RewriteBlockClass: Bad type");
4596  }
4597  assert(CPT && "RewriteBlockClass: Bad type");
4598  const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
4599  assert(FT && "RewriteBlockClass: Bad type");
4600  const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
4601  // FTP will be null for closures that don't take arguments.
4602 
4603  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
4605  &Context->Idents.get("__block_impl"));
4606  QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
4607 
4608  // Generate a funky cast.
4609  SmallVector<QualType, 8> ArgTypes;
4610 
4611  // Push the block argument type.
4612  ArgTypes.push_back(PtrBlock);
4613  if (FTP) {
4614  for (auto &I : FTP->param_types()) {
4615  QualType t = I;
4616  // Make sure we convert "t (^)(...)" to "t (*)(...)".
4617  if (!convertBlockPointerToFunctionPointer(t))
4618  convertToUnqualifiedObjCType(t);
4619  ArgTypes.push_back(t);
4620  }
4621  }
4622  // Now do the pointer to function cast.
4623  QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
4624 
4625  PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
4626 
4627  CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
4628  CK_BitCast,
4629  const_cast<Expr*>(BlockExp));
4630  // Don't forget the parens to enforce the proper binding.
4631  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4632  BlkCast);
4633  //PE->dump();
4634 
4635  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
4636  SourceLocation(),
4637  &Context->Idents.get("FuncPtr"),
4638  Context->VoidPtrTy, nullptr,
4639  /*BitWidth=*/nullptr, /*Mutable=*/true,
4640  ICIS_NoInit);
4641  MemberExpr *ME = MemberExpr::CreateImplicit(
4642  *Context, PE, true, FD, FD->getType(), VK_LValue, OK_Ordinary);
4643 
4644  CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
4645  CK_BitCast, ME);
4646  PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
4647 
4648  SmallVector<Expr*, 8> BlkExprs;
4649  // Add the implicit argument.
4650  BlkExprs.push_back(BlkCast);
4651  // Add the user arguments.
4652  for (CallExpr::arg_iterator I = Exp->arg_begin(),
4653  E = Exp->arg_end(); I != E; ++I) {
4654  BlkExprs.push_back(*I);
4655  }
4656  CallExpr *CE =
4657  CallExpr::Create(*Context, PE, BlkExprs, Exp->getType(), VK_RValue,
4659  return CE;
4660 }
4661 
4662 // We need to return the rewritten expression to handle cases where the
4663 // DeclRefExpr is embedded in another expression being rewritten.
4664 // For example:
4665 //
4666 // int main() {
4667 // __block Foo *f;
4668 // __block int i;
4669 //
4670 // void (^myblock)() = ^() {
4671 // [f test]; // f is a DeclRefExpr embedded in a message (which is being rewritten).
4672 // i = 77;
4673 // };
4674 //}
4675 Stmt *RewriteModernObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
4676  // Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
4677  // for each DeclRefExp where BYREFVAR is name of the variable.
4678  ValueDecl *VD = DeclRefExp->getDecl();
4679  bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() ||
4681 
4682  FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
4683  SourceLocation(),
4684  &Context->Idents.get("__forwarding"),
4685  Context->VoidPtrTy, nullptr,
4686  /*BitWidth=*/nullptr, /*Mutable=*/true,
4687  ICIS_NoInit);
4688  MemberExpr *ME = MemberExpr::CreateImplicit(
4689  *Context, DeclRefExp, isArrow, FD, FD->getType(), VK_LValue, OK_Ordinary);
4690 
4691  StringRef Name = VD->getName();
4692  FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
4693  &Context->Idents.get(Name),
4694  Context->VoidPtrTy, nullptr,
4695  /*BitWidth=*/nullptr, /*Mutable=*/true,
4696  ICIS_NoInit);
4697  ME = MemberExpr::CreateImplicit(*Context, ME, true, FD, DeclRefExp->getType(),
4699 
4700  // Need parens to enforce precedence.
4701  ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
4702  DeclRefExp->getExprLoc(),
4703  ME);
4704  ReplaceStmt(DeclRefExp, PE);
4705  return PE;
4706 }
4707 
4708 // Rewrites the imported local variable V with external storage
4709 // (static, extern, etc.) as *V
4710 //
4711 Stmt *RewriteModernObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
4712  ValueDecl *VD = DRE->getDecl();
4713  if (VarDecl *Var = dyn_cast<VarDecl>(VD))
4714  if (!ImportedLocalExternalDecls.count(Var))
4715  return DRE;
4716  Expr *Exp = UnaryOperator::Create(
4717  const_cast<ASTContext &>(*Context), DRE, UO_Deref, DRE->getType(),
4718  VK_LValue, OK_Ordinary, DRE->getLocation(), false, FPOptionsOverride());
4719  // Need parens to enforce precedence.
4720  ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
4721  Exp);
4722  ReplaceStmt(DRE, PE);
4723  return PE;
4724 }
4725 
4726 void RewriteModernObjC::RewriteCastExpr(CStyleCastExpr *CE) {
4727  SourceLocation LocStart = CE->getLParenLoc();
4728  SourceLocation LocEnd = CE->getRParenLoc();
4729 
4730  // Need to avoid trying to rewrite synthesized casts.
4731  if (LocStart.isInvalid())
4732  return;
4733  // Need to avoid trying to rewrite casts contained in macros.
4734  if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
4735  return;
4736 
4737  const char *startBuf = SM->getCharacterData(LocStart);
4738  const char *endBuf = SM->getCharacterData(LocEnd);
4739  QualType QT = CE->getType();
4740  const Type* TypePtr = QT->getAs<Type>();
4741  if (isa<TypeOfExprType>(TypePtr)) {
4742  const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
4743  QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
4744  std::string TypeAsString = "(";
4745  RewriteBlockPointerType(TypeAsString, QT);
4746  TypeAsString += ")";
4747  ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
4748  return;
4749  }
4750  // advance the location to startArgList.
4751  const char *argPtr = startBuf;
4752 
4753  while (*argPtr++ && (argPtr < endBuf)) {
4754  switch (*argPtr) {
4755  case '^':
4756  // Replace the '^' with '*'.
4757  LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
4758  ReplaceText(LocStart, 1, "*");
4759  break;
4760  }
4761  }
4762 }
4763 
4764 void RewriteModernObjC::RewriteImplicitCastObjCExpr(CastExpr *IC) {
4765  CastKind CastKind = IC->getCastKind();
4766  if (CastKind != CK_BlockPointerToObjCPointerCast &&
4767  CastKind != CK_AnyPointerToBlockPointerCast)
4768  return;
4769 
4770  QualType QT = IC->getType();
4771  (void)convertBlockPointerToFunctionPointer(QT);
4772  std::string TypeString(QT.getAsString(Context->getPrintingPolicy()));
4773  std::string Str = "(";
4774  Str += TypeString;
4775  Str += ")";
4776  InsertText(IC->getSubExpr()->getBeginLoc(), Str);
4777 }
4778 
4779 void RewriteModernObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
4780  SourceLocation DeclLoc = FD->getLocation();
4781  unsigned parenCount = 0;
4782 
4783  // We have 1 or more arguments that have closure pointers.
4784  const char *startBuf = SM->getCharacterData(DeclLoc);
4785  const char *startArgList = strchr(startBuf, '(');
4786 
4787  assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
4788 
4789  parenCount++;
4790  // advance the location to startArgList.
4791  DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
4792  assert((DeclLoc.isValid()) && "Invalid DeclLoc");
4793 
4794  const char *argPtr = startArgList;
4795 
4796  while (*argPtr++ && parenCount) {
4797  switch (*argPtr) {
4798  case '^':
4799  // Replace the '^' with '*'.
4800  DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
4801  ReplaceText(DeclLoc, 1, "*");
4802  break;
4803  case '(':
4804  parenCount++;
4805  break;
4806  case ')':
4807  parenCount--;
4808  break;
4809  }
4810  }
4811 }
4812 
4813 bool RewriteModernObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
4814  const FunctionProtoType *FTP;
4815  const PointerType *PT = QT->getAs<PointerType>();
4816  if (PT) {
4817  FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4818  } else {
4819  const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4820  assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4821  FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4822  }
4823  if (FTP) {
4824  for (const auto &I : FTP->param_types())
4825  if (isTopLevelBlockPointerType(I))
4826  return true;
4827  }
4828  return false;
4829 }
4830 
4831 bool RewriteModernObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
4832  const FunctionProtoType *FTP;
4833  const PointerType *PT = QT->getAs<PointerType>();
4834  if (PT) {
4835  FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
4836  } else {
4837  const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
4838  assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
4839  FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
4840  }
4841  if (FTP) {
4842  for (const auto &I : FTP->param_types()) {
4843  if (I->isObjCQualifiedIdType())
4844  return true;
4845  if (I->isObjCObjectPointerType() &&
4846  I->getPointeeType()->isObjCQualifiedInterfaceType())
4847  return true;
4848  }
4849 
4850  }
4851  return false;
4852 }
4853 
4854 void RewriteModernObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
4855  const char *&RParen) {
4856  const char *argPtr = strchr(Name, '(');
4857  assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
4858 
4859  LParen = argPtr; // output the start.
4860  argPtr++; // skip past the left paren.
4861  unsigned parenCount = 1;
4862 
4863  while (*argPtr && parenCount) {
4864  switch (*argPtr) {
4865  case '(': parenCount++; break;
4866  case ')': parenCount--; break;
4867  default: break;
4868  }
4869  if (parenCount) argPtr++;
4870  }
4871  assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
4872  RParen = argPtr; // output the end
4873 }
4874 
4875 void RewriteModernObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
4876  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
4877  RewriteBlockPointerFunctionArgs(FD);
4878  return;
4879  }
4880  // Handle Variables and Typedefs.
4881  SourceLocation DeclLoc = ND->getLocation();
4882  QualType DeclT;
4883  if (VarDecl *VD = dyn_cast<VarDecl>(ND))
4884  DeclT = VD->getType();
4885  else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
4886  DeclT = TDD->getUnderlyingType();
4887  else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
4888  DeclT = FD->getType();
4889  else
4890  llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
4891 
4892  const char *startBuf = SM->getCharacterData(DeclLoc);
4893  const char *endBuf = startBuf;
4894  // scan backward (from the decl location) for the end of the previous decl.
4895  while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
4896  startBuf--;
4897  SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
4898  std::string buf;
4899  unsigned OrigLength=0;
4900  // *startBuf != '^' if we are dealing with a pointer to function that
4901  // may take block argument types (which will be handled below).
4902  if (*startBuf == '^') {
4903  // Replace the '^' with '*', computing a negative offset.
4904  buf = '*';
4905  startBuf++;
4906  OrigLength++;
4907  }
4908  while (*startBuf != ')') {
4909  buf += *startBuf;
4910  startBuf++;
4911  OrigLength++;
4912  }
4913  buf += ')';
4914  OrigLength++;
4915 
4916  if (PointerTypeTakesAnyBlockArguments(DeclT) ||
4917  PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
4918  // Replace the '^' with '*' for arguments.
4919  // Replace id<P> with id/*<>*/
4920  DeclLoc = ND->getLocation();
4921  startBuf = SM->getCharacterData(DeclLoc);
4922  const char *argListBegin, *argListEnd;
4923  GetExtentOfArgList(startBuf, argListBegin, argListEnd);
4924  while (argListBegin < argListEnd) {
4925  if (*argListBegin == '^')
4926  buf += '*';
4927  else if (*argListBegin == '<') {
4928  buf += "/*";
4929  buf += *argListBegin++;
4930  OrigLength++;
4931  while (*argListBegin != '>') {
4932  buf += *argListBegin++;
4933  OrigLength++;
4934  }
4935  buf += *argListBegin;
4936  buf += "*/";
4937  }
4938  else
4939  buf += *argListBegin;
4940  argListBegin++;
4941  OrigLength++;
4942  }
4943  buf += ')';
4944  OrigLength++;
4945  }
4946  ReplaceText(Start, OrigLength, buf);
4947 }
4948 
4949 /// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
4950 /// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
4951 /// struct Block_byref_id_object *src) {
4952 /// _Block_object_assign (&_dest->object, _src->object,
4953 /// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
4954 /// [|BLOCK_FIELD_IS_WEAK]) // object
4955 /// _Block_object_assign(&_dest->object, _src->object,
4956 /// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
4957 /// [|BLOCK_FIELD_IS_WEAK]) // block
4958 /// }
4959 /// And:
4960 /// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
4961 /// _Block_object_dispose(_src->object,
4962 /// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
4963 /// [|BLOCK_FIELD_IS_WEAK]) // object
4964 /// _Block_object_dispose(_src->object,
4965 /// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
4966 /// [|BLOCK_FIELD_IS_WEAK]) // block
4967 /// }
4968 
4969 std::string RewriteModernObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
4970  int flag) {
4971  std::string S;
4972  if (CopyDestroyCache.count(flag))
4973  return S;
4974  CopyDestroyCache.insert(flag);
4975  S = "static void __Block_byref_id_object_copy_";
4976  S += utostr(flag);
4977  S += "(void *dst, void *src) {\n";
4978 
4979  // offset into the object pointer is computed as:
4980  // void * + void* + int + int + void* + void *
4981  unsigned IntSize =
4982  static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
4983  unsigned VoidPtrSize =
4984  static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
4985 
4986  unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
4987  S += " _Block_object_assign((char*)dst + ";
4988  S += utostr(offset);
4989  S += ", *(void * *) ((char*)src + ";
4990  S += utostr(offset);
4991  S += "), ";
4992  S += utostr(flag);
4993  S += ");\n}\n";
4994 
4995  S += "static void __Block_byref_id_object_dispose_";
4996  S += utostr(flag);
4997  S += "(void *src) {\n";
4998  S += " _Block_object_dispose(*(void * *) ((char*)src + ";
4999  S += utostr(offset);
5000  S += "), ";
5001  S += utostr(flag);
5002  S += ");\n}\n";
5003  return S;
5004 }
5005 
5006 /// RewriteByRefVar - For each __block typex ND variable this routine transforms
5007 /// the declaration into:
5008 /// struct __Block_byref_ND {
5009 /// void *__isa; // NULL for everything except __weak pointers
5010 /// struct __Block_byref_ND *__forwarding;
5011 /// int32_t __flags;
5012 /// int32_t __size;
5013 /// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
5014 /// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
5015 /// typex ND;
5016 /// };
5017 ///
5018 /// It then replaces declaration of ND variable with:
5019 /// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
5020 /// __size=sizeof(struct __Block_byref_ND),
5021 /// ND=initializer-if-any};
5022 ///
5023 ///
5024 void RewriteModernObjC::RewriteByRefVar(VarDecl *ND, bool firstDecl,
5025  bool lastDecl) {
5026  int flag = 0;
5027  int isa = 0;
5028  SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
5029  if (DeclLoc.isInvalid())
5030  // If type location is missing, it is because of missing type (a warning).
5031  // Use variable's location which is good for this case.
5032  DeclLoc = ND->getLocation();
5033  const char *startBuf = SM->getCharacterData(DeclLoc);
5034  SourceLocation X = ND->getEndLoc();
5035  X = SM->getExpansionLoc(X);
5036  const char *endBuf = SM->getCharacterData(X);
5037  std::string Name(ND->getNameAsString());
5038  std::string ByrefType;
5039  RewriteByRefString(ByrefType, Name, ND, true);
5040  ByrefType += " {\n";
5041  ByrefType += " void *__isa;\n";
5042  RewriteByRefString(ByrefType, Name, ND);
5043  ByrefType += " *__forwarding;\n";
5044  ByrefType += " int __flags;\n";
5045  ByrefType += " int __size;\n";
5046  // Add void *__Block_byref_id_object_copy;
5047  // void *__Block_byref_id_object_dispose; if needed.
5048  QualType Ty = ND->getType();
5049  bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
5050  if (HasCopyAndDispose) {
5051  ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
5052  ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
5053  }
5054 
5055  QualType T = Ty;
5056  (void)convertBlockPointerToFunctionPointer(T);
5057  T.getAsStringInternal(Name, Context->getPrintingPolicy());
5058 
5059  ByrefType += " " + Name + ";\n";
5060  ByrefType += "};\n";
5061  // Insert this type in global scope. It is needed by helper function.
5062  SourceLocation FunLocStart;
5063  if (CurFunctionDef)
5064  FunLocStart = getFunctionSourceLocation(*this, CurFunctionDef);
5065  else {
5066  assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
5067  FunLocStart = CurMethodDef->getBeginLoc();
5068  }
5069  InsertText(FunLocStart, ByrefType);
5070 
5071  if (Ty.isObjCGCWeak()) {
5072  flag |= BLOCK_FIELD_IS_WEAK;
5073  isa = 1;
5074  }
5075  if (HasCopyAndDispose) {
5076  flag = BLOCK_BYREF_CALLER;
5077  QualType Ty = ND->getType();
5078  // FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
5079  if (Ty->isBlockPointerType())
5080  flag |= BLOCK_FIELD_IS_BLOCK;
5081  else
5082  flag |= BLOCK_FIELD_IS_OBJECT;
5083  std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
5084  if (!HF.empty())
5085  Preamble += HF;
5086  }
5087 
5088  // struct __Block_byref_ND ND =
5089  // {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
5090  // initializer-if-any};
5091  bool hasInit = (ND->getInit() != nullptr);
5092  // FIXME. rewriter does not support __block c++ objects which
5093  // require construction.
5094  if (hasInit)
5095  if (CXXConstructExpr *CExp = dyn_cast<CXXConstructExpr>(ND->getInit())) {
5096  CXXConstructorDecl *CXXDecl = CExp->getConstructor();
5097  if (CXXDecl && CXXDecl->isDefaultConstructor())
5098  hasInit = false;
5099  }
5100 
5101  unsigned flags = 0;
5102  if (HasCopyAndDispose)
5103  flags |= BLOCK_HAS_COPY_DISPOSE;
5104  Name = ND->getNameAsString();
5105  ByrefType.clear();
5106  RewriteByRefString(ByrefType, Name, ND);
5107  std::string ForwardingCastType("(");
5108  ForwardingCastType += ByrefType + " *)";
5109  ByrefType += " " + Name + " = {(void*)";
5110  ByrefType += utostr(isa);
5111  ByrefType += "," + ForwardingCastType + "&" + Name + ", ";
5112  ByrefType += utostr(flags);
5113  ByrefType += ", ";
5114  ByrefType += "sizeof(";
5115  RewriteByRefString(ByrefType, Name, ND);
5116  ByrefType += ")";
5117  if (HasCopyAndDispose) {
5118  ByrefType += ", __Block_byref_id_object_copy_";
5119  ByrefType += utostr(flag);
5120  ByrefType += ", __Block_byref_id_object_dispose_";
5121  ByrefType += utostr(flag);
5122  }
5123 
5124  if (!firstDecl) {
5125  // In multiple __block declarations, and for all but 1st declaration,
5126  // find location of the separating comma. This would be start location
5127  // where new text is to be inserted.
5128  DeclLoc = ND->getLocation();
5129  const char *startDeclBuf = SM->getCharacterData(DeclLoc);
5130  const char *commaBuf = startDeclBuf;
5131  while (*commaBuf != ',')
5132  commaBuf--;
5133  assert((*commaBuf == ',') && "RewriteByRefVar: can't find ','");
5134  DeclLoc = DeclLoc.getLocWithOffset(commaBuf - startDeclBuf);
5135  startBuf = commaBuf;
5136  }
5137 
5138  if (!hasInit) {
5139  ByrefType += "};\n";
5140  unsigned nameSize = Name.size();
5141  // for block or function pointer declaration. Name is already
5142  // part of the declaration.
5143  if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
5144  nameSize = 1;
5145  ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
5146  }
5147  else {
5148  ByrefType += ", ";
5149  SourceLocation startLoc;
5150  Expr *E = ND->getInit();
5151  if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
5152  startLoc = ECE->getLParenLoc();
5153  else
5154  startLoc = E->getBeginLoc();
5155  startLoc = SM->getExpansionLoc(startLoc);
5156  endBuf = SM->getCharacterData(startLoc);
5157  ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
5158 
5159  const char separator = lastDecl ? ';' : ',';
5160  const char *startInitializerBuf = SM->getCharacterData(startLoc);
5161  const char *separatorBuf = strchr(startInitializerBuf, separator);
5162  assert((*separatorBuf == separator) &&
5163  "RewriteByRefVar: can't find ';' or ','");
5164  SourceLocation separatorLoc =
5165  startLoc.getLocWithOffset(separatorBuf-startInitializerBuf);
5166 
5167  InsertText(separatorLoc, lastDecl ? "}" : "};\n");
5168  }
5169 }
5170 
5171 void RewriteModernObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
5172  // Add initializers for any closure decl refs.
5173  GetBlockDeclRefExprs(Exp->getBody());
5174  if (BlockDeclRefs.size()) {
5175  // Unique all "by copy" declarations.
5176  for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5177  if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5178  if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5179  BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5180  BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
5181  }
5182  }
5183  // Unique all "by ref" declarations.
5184  for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5185  if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
5186  if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
5187  BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
5188  BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
5189  }
5190  }
5191  // Find any imported blocks...they will need special attention.
5192  for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
5193  if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5194  BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5195  BlockDeclRefs[i]->getType()->isBlockPointerType())
5196  ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
5197  }
5198 }
5199 
5200 FunctionDecl *RewriteModernObjC::SynthBlockInitFunctionDecl(StringRef name) {
5201  IdentifierInfo *ID = &Context->Idents.get(name);
5202  QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
5203  return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
5204  SourceLocation(), ID, FType, nullptr, SC_Extern,
5205  false, false);
5206 }
5207 
5208 Stmt *RewriteModernObjC::SynthBlockInitExpr(BlockExpr *Exp,
5209  const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
5210  const BlockDecl *block = Exp->getBlockDecl();
5211 
5212  Blocks.push_back(Exp);
5213 
5214  CollectBlockDeclRefInfo(Exp);
5215 
5216  // Add inner imported variables now used in current block.
5217  int countOfInnerDecls = 0;
5218  if (!InnerBlockDeclRefs.empty()) {
5219  for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
5220  DeclRefExpr *Exp = InnerBlockDeclRefs[i];
5221  ValueDecl *VD = Exp->getDecl();
5222  if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
5223  // We need to save the copied-in variables in nested
5224  // blocks because it is needed at the end for some of the API generations.
5225  // See SynthesizeBlockLiterals routine.
5226  InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5227  BlockDeclRefs.push_back(Exp);
5228  BlockByCopyDeclsPtrSet.insert(VD);
5229  BlockByCopyDecls.push_back(VD);
5230  }
5231  if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
5232  InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
5233  BlockDeclRefs.push_back(Exp);
5234  BlockByRefDeclsPtrSet.insert(VD);
5235  BlockByRefDecls.push_back(VD);
5236  }
5237  }
5238  // Find any imported blocks...they will need special attention.
5239  for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
5240  if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
5241  InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
5242  InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
5243  ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
5244  }
5245  InnerDeclRefsCount.push_back(countOfInnerDecls);
5246 
5247  std::string FuncName;
5248 
5249  if (CurFunctionDef)
5250  FuncName = CurFunctionDef->getNameAsString();
5251  else if (CurMethodDef)
5252  BuildUniqueMethodName(FuncName, CurMethodDef);
5253  else if (GlobalVarDecl)
5254  FuncName = std::string(GlobalVarDecl->getNameAsString());
5255 
5256  bool GlobalBlockExpr =
5258 
5259  if (GlobalBlockExpr && !GlobalVarDecl) {
5260  Diags.Report(block->getLocation(), GlobalBlockRewriteFailedDiag);
5261  GlobalBlockExpr = false;
5262  }
5263 
5264  std::string BlockNumber = utostr(Blocks.size()-1);
5265 
5266  std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
5267 
5268  // Get a pointer to the function type so we can cast appropriately.
5269  QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
5270  QualType FType = Context->getPointerType(BFT);
5271 
5272  FunctionDecl *FD;
5273  Expr *NewRep;
5274 
5275  // Simulate a constructor call...
5276  std::string Tag;
5277 
5278  if (GlobalBlockExpr)
5279  Tag = "__global_";
5280  else
5281  Tag = "__";
5282  Tag += FuncName + "_block_impl_" + BlockNumber;
5283 
5284  FD = SynthBlockInitFunctionDecl(Tag);
5285  DeclRefExpr *DRE = new (Context)
5286  DeclRefExpr(*Context, FD, false, FType, VK_RValue, SourceLocation());
5287 
5288  SmallVector<Expr*, 4> InitExprs;
5289 
5290  // Initialize the block function.
5291  FD = SynthBlockInitFunctionDecl(Func);
5292  DeclRefExpr *Arg = new (Context) DeclRefExpr(
5293  *Context, FD, false, FD->getType(), VK_LValue, SourceLocation());
5294  CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5295  CK_BitCast, Arg);
5296  InitExprs.push_back(castExpr);
5297 
5298  // Initialize the block descriptor.
5299  std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
5300 
5301  VarDecl *NewVD = VarDecl::Create(
5302  *Context, TUDecl, SourceLocation(), SourceLocation(),
5303  &Context->Idents.get(DescData), Context->VoidPtrTy, nullptr, SC_Static);
5304  UnaryOperator *DescRefExpr = UnaryOperator::Create(
5305  const_cast<ASTContext &>(*Context),
5306  new (Context) DeclRefExpr(*Context, NewVD, false, Context->VoidPtrTy,
5308  UO_AddrOf, Context->getPointerType(Context->VoidPtrTy), VK_RValue,
5310  InitExprs.push_back(DescRefExpr);
5311 
5312  // Add initializers for any closure decl refs.
5313  if (BlockDeclRefs.size()) {
5314  Expr *Exp;
5315  // Output all "by copy" declarations.
5316  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
5317  E = BlockByCopyDecls.end(); I != E; ++I) {
5318  if (isObjCType((*I)->getType())) {
5319  // FIXME: Conform to ABI ([[obj retain] autorelease]).
5320  FD = SynthBlockInitFunctionDecl((*I)->getName());
5321  Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5324  QualType QT = (*I)->getType();
5325  QT = Context->getPointerType(QT);
5326  Exp = UnaryOperator::Create(
5327  const_cast<ASTContext &>(*Context), Exp, UO_AddrOf, QT, VK_RValue,
5329  }
5330  } else if (isTopLevelBlockPointerType((*I)->getType())) {
5331  FD = SynthBlockInitFunctionDecl((*I)->getName());
5332  Arg = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5334  Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
5335  CK_BitCast, Arg);
5336  } else {
5337  FD = SynthBlockInitFunctionDecl((*I)->getName());
5338  Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5341  QualType QT = (*I)->getType();
5342  QT = Context->getPointerType(QT);
5343  Exp = UnaryOperator::Create(
5344  const_cast<ASTContext &>(*Context), Exp, UO_AddrOf, QT, VK_RValue,
5346  }
5347 
5348  }
5349  InitExprs.push_back(Exp);
5350  }
5351  // Output all "by ref" declarations.
5352  for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
5353  E = BlockByRefDecls.end(); I != E; ++I) {
5354  ValueDecl *ND = (*I);
5355  std::string Name(ND->getNameAsString());
5356  std::string RecName;
5357  RewriteByRefString(RecName, Name, ND, true);
5358  IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
5359  + sizeof("struct"));
5360  RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
5362  II);
5363  assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
5364  QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
5365 
5366  FD = SynthBlockInitFunctionDecl((*I)->getName());
5367  Exp = new (Context) DeclRefExpr(*Context, FD, false, FD->getType(),
5369  bool isNestedCapturedVar = false;
5370  if (block)
5371  for (const auto &CI : block->captures()) {
5372  const VarDecl *variable = CI.getVariable();
5373  if (variable == ND && CI.isNested()) {
5374  assert (CI.isByRef() &&
5375  "SynthBlockInitExpr - captured block variable is not byref");
5376  isNestedCapturedVar = true;
5377  break;
5378  }
5379  }
5380  // captured nested byref variable has its address passed. Do not take
5381  // its address again.
5382  if (!isNestedCapturedVar)
5383  Exp = UnaryOperator::Create(
5384  const_cast<ASTContext &>(*Context), Exp, UO_AddrOf,
5385  Context->getPointerType(Exp->getType()), VK_RValue, OK_Ordinary,
5386  SourceLocation(), false, FPOptionsOverride());
5387  Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
5388  InitExprs.push_back(Exp);
5389  }
5390  }
5391  if (ImportedBlockDecls.size()) {
5392  // generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
5393  int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
5394  unsigned IntSize =
5395  static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
5396  Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
5397  Context->IntTy, SourceLocation());
5398  InitExprs.push_back(FlagExp);
5399  }
5400  NewRep = CallExpr::Create(*Context, DRE, InitExprs, FType, VK_LValue,
5402 
5403  if (GlobalBlockExpr) {
5404  assert (!GlobalConstructionExp &&
5405  "SynthBlockInitExpr - GlobalConstructionExp must be null");
5406  GlobalConstructionExp = NewRep;
5407  NewRep = DRE;
5408  }
5409 
5410  NewRep = UnaryOperator::Create(
5411  const_cast<ASTContext &>(*Context), NewRep, UO_AddrOf,
5412  Context->getPointerType(NewRep->getType()), VK_RValue, OK_Ordinary,
5413  SourceLocation(), false, FPOptionsOverride());
5414  NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
5415  NewRep);
5416  // Put Paren around the call.
5417  NewRep = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
5418  NewRep);
5419 
5420  BlockDeclRefs.clear();
5421  BlockByRefDecls.clear();
5422  BlockByRefDeclsPtrSet.clear();
5423  BlockByCopyDecls.clear();
5424  BlockByCopyDeclsPtrSet.clear();
5425  ImportedBlockDecls.clear();
5426  return NewRep;
5427 }
5428 
5429 bool RewriteModernObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
5430  if (const ObjCForCollectionStmt * CS =
5431  dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
5432  return CS->getElement() == DS;
5433  return false;
5434 }
5435 
5436 //===----------------------------------------------------------------------===//
5437 // Function Body / Expression rewriting
5438 //===----------------------------------------------------------------------===//
5439 
5440 Stmt *RewriteModernObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
5441  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
5442  isa<DoStmt>(S) || isa<ForStmt>(S))
5443  Stmts.push_back(S);
5444  else if (isa<ObjCForCollectionStmt>(S)) {
5445  Stmts.push_back(S);
5446  ObjCBcLabelNo.push_back(++BcLabelCount);
5447  }
5448 
5449  // Pseudo-object operations and ivar references need special
5450  // treatment because we're going to recursively rewrite them.
5451  if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
5452  if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
5453  return RewritePropertyOrImplicitSetter(PseudoOp);
5454  } else {
5455  return RewritePropertyOrImplicitGetter(PseudoOp);
5456  }
5457  } else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
5458  return RewriteObjCIvarRefExpr(IvarRefExpr);
5459  }
5460  else if (isa<OpaqueValueExpr>(S))
5461  S = cast<OpaqueValueExpr>(S)->getSourceExpr();
5462 
5463  SourceRange OrigStmtRange = S->getSourceRange();
5464 
5465  // Perform a bottom up rewrite of all children.
5466  for (Stmt *&childStmt : S->children())
5467  if (childStmt) {
5468  Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
5469  if (newStmt) {
5470  childStmt = newStmt;
5471  }
5472  }
5473 
5474  if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
5475  SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
5477  InnerContexts.insert(BE->getBlockDecl());
5478  ImportedLocalExternalDecls.clear();
5479  GetInnerBlockDeclRefExprs(BE->getBody(),
5480  InnerBlockDeclRefs, InnerContexts);
5481  // Rewrite the block body in place.
5482  Stmt *SaveCurrentBody = CurrentBody;
5483  CurrentBody = BE->getBody();
5484  PropParentMap = nullptr;
5485  // block literal on rhs of a property-dot-sytax assignment
5486  // must be replaced by its synthesize ast so getRewrittenText
5487  // works as expected. In this case, what actually ends up on RHS
5488  // is the blockTranscribed which is the helper function for the
5489  // block literal; as in: self.c = ^() {[ace ARR];};
5490  bool saveDisableReplaceStmt = DisableReplaceStmt;
5491  DisableReplaceStmt = false;
5492  RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
5493  DisableReplaceStmt = saveDisableReplaceStmt;
5494  CurrentBody = SaveCurrentBody;
5495  PropParentMap = nullptr;
5496  ImportedLocalExternalDecls.clear();
5497  // Now we snarf the rewritten text and stash it away for later use.
5498  std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
5499  RewrittenBlockExprs[BE] = Str;
5500 
5501  Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
5502 
5503  //blockTranscribed->dump();
5504  ReplaceStmt(S, blockTranscribed);
5505  return blockTranscribed;
5506  }
5507  // Handle specific things.
5508  if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
5509  return RewriteAtEncode(AtEncode);
5510 
5511  if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
5512  return RewriteAtSelector(AtSelector);
5513 
5514  if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
5515  return RewriteObjCStringLiteral(AtString);
5516 
5517  if (ObjCBoolLiteralExpr *BoolLitExpr = dyn_cast<ObjCBoolLiteralExpr>(S))
5518  return RewriteObjCBoolLiteralExpr(BoolLitExpr);
5519 
5520  if (ObjCBoxedExpr *BoxedExpr = dyn_cast<ObjCBoxedExpr>(S))
5521  return RewriteObjCBoxedExpr(BoxedExpr);
5522 
5523  if (ObjCArrayLiteral *ArrayLitExpr = dyn_cast<ObjCArrayLiteral>(S))
5524  return RewriteObjCArrayLiteralExpr(ArrayLitExpr);
5525 
5526  if (ObjCDictionaryLiteral *DictionaryLitExpr =
5527  dyn_cast<ObjCDictionaryLiteral>(S))
5528  return RewriteObjCDictionaryLiteralExpr(DictionaryLitExpr);
5529 
5530  if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
5531 #if 0
5532  // Before we rewrite it, put the original message expression in a comment.
5533  SourceLocation startLoc = MessExpr->getBeginLoc();
5534  SourceLocation endLoc = MessExpr->getEndLoc();
5535 
5536  const char *startBuf = SM->getCharacterData(startLoc);
5537  const char *endBuf = SM->getCharacterData(endLoc);
5538 
5539  std::string messString;
5540  messString += "// ";
5541  messString.append(startBuf, endBuf-startBuf+1);
5542  messString += "\n";
5543 
5544  // FIXME: Missing definition of
5545  // InsertText(clang::SourceLocation, char const*, unsigned int).
5546  // InsertText(startLoc, messString);
5547  // Tried this, but it didn't work either...
5548  // ReplaceText(startLoc, 0, messString.c_str(), messString.size());
5549 #endif
5550  return RewriteMessageExpr(MessExpr);
5551  }
5552 
5553  if (ObjCAutoreleasePoolStmt *StmtAutoRelease =
5554  dyn_cast<ObjCAutoreleasePoolStmt>(S)) {
5555  return RewriteObjCAutoreleasePoolStmt(StmtAutoRelease);
5556  }
5557 
5558  if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
5559  return RewriteObjCTryStmt(StmtTry);
5560 
5561  if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
5562  return RewriteObjCSynchronizedStmt(StmtTry);
5563 
5564  if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
5565  return RewriteObjCThrowStmt(StmtThrow);
5566 
5567  if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
5568  return RewriteObjCProtocolExpr(ProtocolExp);
5569 
5570  if (ObjCForCollectionStmt *StmtForCollection =
5571  dyn_cast<ObjCForCollectionStmt>(S))
5572  return RewriteObjCForCollectionStmt(StmtForCollection,
5573  OrigStmtRange.getEnd());
5574  if (BreakStmt *StmtBreakStmt =
5575  dyn_cast<BreakStmt>(S))
5576  return RewriteBreakStmt(StmtBreakStmt);
5577  if (ContinueStmt *StmtContinueStmt =
5578  dyn_cast<ContinueStmt>(S))
5579  return RewriteContinueStmt(StmtContinueStmt);
5580 
5581  // Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
5582  // and cast exprs.
5583  if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
5584  // FIXME: What we're doing here is modifying the type-specifier that
5585  // precedes the first Decl. In the future the DeclGroup should have
5586  // a separate type-specifier that we can rewrite.
5587  // NOTE: We need to avoid rewriting the DeclStmt if it is within
5588  // the context of an ObjCForCollectionStmt. For example:
5589  // NSArray *someArray;
5590  // for (id <FooProtocol> index in someArray) ;
5591  // This is because RewriteObjCForCollectionStmt() does textual rewriting
5592  // and it depends on the original text locations/positions.
5593  if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
5594  RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
5595 
5596  // Blocks rewrite rules.
5597  for (DeclStmt::decl_iterator DI = DS->decl_begin(), DE = DS->decl_end();
5598  DI != DE; ++DI) {
5599  Decl *SD = *DI;
5600  if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
5601  if (isTopLevelBlockPointerType(ND->getType()))
5602  RewriteBlockPointerDecl(ND);
5603  else if (ND->getType()->isFunctionPointerType())
5604  CheckFunctionPointerDecl(ND->getType(), ND);
5605  if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
5606  if (VD->hasAttr<BlocksAttr>()) {
5607  static unsigned uniqueByrefDeclCount = 0;
5608  assert(!BlockByRefDeclNo.count(ND) &&
5609  "RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
5610  BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
5611  RewriteByRefVar(VD, (DI == DS->decl_begin()), ((DI+1) == DE));
5612  }
5613  else
5614  RewriteTypeOfDecl(VD);
5615  }
5616  }
5617  if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
5618  if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
5619  RewriteBlockPointerDecl(TD);
5620  else if (TD->getUnderlyingType()->isFunctionPointerType())
5621  CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
5622  }
5623  }
5624  }
5625 
5626  if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
5627  RewriteObjCQualifiedInterfaceTypes(CE);
5628 
5629  if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
5630  isa<DoStmt>(S) || isa<ForStmt>(S)) {
5631  assert(!Stmts.empty() && "Statement stack is empty");
5632  assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
5633  isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
5634  && "Statement stack mismatch");
5635  Stmts.pop_back();
5636  }
5637  // Handle blocks rewriting.
5638  if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
5639  ValueDecl *VD = DRE->getDecl();
5640  if (VD->hasAttr<BlocksAttr>())
5641  return RewriteBlockDeclRefExpr(DRE);
5642  if (HasLocalVariableEx