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SemaObjCProperty.cpp
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1 //===--- SemaObjCProperty.cpp - Semantic Analysis for ObjC @property ------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements semantic analysis for Objective C @property and
11 // @synthesize declarations.
12 //
13 //===----------------------------------------------------------------------===//
14 
17 #include "clang/AST/DeclObjC.h"
18 #include "clang/AST/ExprCXX.h"
19 #include "clang/AST/ExprObjC.h"
21 #include "clang/Lex/Lexer.h"
22 #include "clang/Lex/Preprocessor.h"
24 #include "llvm/ADT/DenseSet.h"
25 #include "llvm/ADT/SmallString.h"
26 
27 using namespace clang;
28 
29 //===----------------------------------------------------------------------===//
30 // Grammar actions.
31 //===----------------------------------------------------------------------===//
32 
33 /// getImpliedARCOwnership - Given a set of property attributes and a
34 /// type, infer an expected lifetime. The type's ownership qualification
35 /// is not considered.
36 ///
37 /// Returns OCL_None if the attributes as stated do not imply an ownership.
38 /// Never returns OCL_Autoreleasing.
41  QualType type) {
42  // retain, strong, copy, weak, and unsafe_unretained are only legal
43  // on properties of retainable pointer type.
48  } else if (attrs & ObjCPropertyDecl::OBJC_PR_weak) {
49  return Qualifiers::OCL_Weak;
52  }
53 
54  // assign can appear on other types, so we have to check the
55  // property type.
57  type->isObjCRetainableType()) {
59  }
60 
61  return Qualifiers::OCL_None;
62 }
63 
64 /// Check the internal consistency of a property declaration with
65 /// an explicit ownership qualifier.
67  ObjCPropertyDecl *property) {
68  if (property->isInvalidDecl()) return;
69 
71  = property->getPropertyAttributes();
72  Qualifiers::ObjCLifetime propertyLifetime
73  = property->getType().getObjCLifetime();
74 
75  assert(propertyLifetime != Qualifiers::OCL_None);
76 
77  Qualifiers::ObjCLifetime expectedLifetime
78  = getImpliedARCOwnership(propertyKind, property->getType());
79  if (!expectedLifetime) {
80  // We have a lifetime qualifier but no dominating property
81  // attribute. That's okay, but restore reasonable invariants by
82  // setting the property attribute according to the lifetime
83  // qualifier.
85  if (propertyLifetime == Qualifiers::OCL_Strong) {
87  } else if (propertyLifetime == Qualifiers::OCL_Weak) {
89  } else {
90  assert(propertyLifetime == Qualifiers::OCL_ExplicitNone);
92  }
93  property->setPropertyAttributes(attr);
94  return;
95  }
96 
97  if (propertyLifetime == expectedLifetime) return;
98 
99  property->setInvalidDecl();
100  S.Diag(property->getLocation(),
101  diag::err_arc_inconsistent_property_ownership)
102  << property->getDeclName()
103  << expectedLifetime
104  << propertyLifetime;
105 }
106 
107 /// \brief Check this Objective-C property against a property declared in the
108 /// given protocol.
109 static void
111  ObjCProtocolDecl *Proto,
112  llvm::SmallPtrSetImpl<ObjCProtocolDecl *> &Known) {
113  // Have we seen this protocol before?
114  if (!Known.insert(Proto).second)
115  return;
116 
117  // Look for a property with the same name.
118  DeclContext::lookup_result R = Proto->lookup(Prop->getDeclName());
119  for (unsigned I = 0, N = R.size(); I != N; ++I) {
120  if (ObjCPropertyDecl *ProtoProp = dyn_cast<ObjCPropertyDecl>(R[I])) {
121  S.DiagnosePropertyMismatch(Prop, ProtoProp, Proto->getIdentifier(), true);
122  return;
123  }
124  }
125 
126  // Check this property against any protocols we inherit.
127  for (auto *P : Proto->protocols())
128  CheckPropertyAgainstProtocol(S, Prop, P, Known);
129 }
130 
132  // In GC mode, just look for the __weak qualifier.
133  if (S.getLangOpts().getGC() != LangOptions::NonGC) {
134  if (T.isObjCGCWeak()) return ObjCDeclSpec::DQ_PR_weak;
135 
136  // In ARC/MRC, look for an explicit ownership qualifier.
137  // For some reason, this only applies to __weak.
138  } else if (auto ownership = T.getObjCLifetime()) {
139  switch (ownership) {
148  return 0;
149  }
150  llvm_unreachable("bad qualifier");
151  }
152 
153  return 0;
154 }
155 
156 static const unsigned OwnershipMask =
163 
164 static unsigned getOwnershipRule(unsigned attr) {
165  unsigned result = attr & OwnershipMask;
166 
167  // From an ownership perspective, assign and unsafe_unretained are
168  // identical; make sure one also implies the other.
169  if (result & (ObjCPropertyDecl::OBJC_PR_assign |
173  }
174 
175  return result;
176 }
177 
179  SourceLocation LParenLoc,
180  FieldDeclarator &FD,
181  ObjCDeclSpec &ODS,
182  Selector GetterSel,
183  Selector SetterSel,
184  tok::ObjCKeywordKind MethodImplKind,
185  DeclContext *lexicalDC) {
186  unsigned Attributes = ODS.getPropertyAttributes();
187  FD.D.setObjCWeakProperty((Attributes & ObjCDeclSpec::DQ_PR_weak) != 0);
188  TypeSourceInfo *TSI = GetTypeForDeclarator(FD.D, S);
189  QualType T = TSI->getType();
190  if (!getOwnershipRule(Attributes)) {
191  Attributes |= deducePropertyOwnershipFromType(*this, T);
192  }
193  bool isReadWrite = ((Attributes & ObjCDeclSpec::DQ_PR_readwrite) ||
194  // default is readwrite!
195  !(Attributes & ObjCDeclSpec::DQ_PR_readonly));
196 
197  // Proceed with constructing the ObjCPropertyDecls.
198  ObjCContainerDecl *ClassDecl = cast<ObjCContainerDecl>(CurContext);
199  ObjCPropertyDecl *Res = nullptr;
200  if (ObjCCategoryDecl *CDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
201  if (CDecl->IsClassExtension()) {
202  Res = HandlePropertyInClassExtension(S, AtLoc, LParenLoc,
203  FD, GetterSel, SetterSel,
204  isReadWrite,
205  Attributes,
206  ODS.getPropertyAttributes(),
207  T, TSI, MethodImplKind);
208  if (!Res)
209  return nullptr;
210  }
211  }
212 
213  if (!Res) {
214  Res = CreatePropertyDecl(S, ClassDecl, AtLoc, LParenLoc, FD,
215  GetterSel, SetterSel, isReadWrite,
216  Attributes, ODS.getPropertyAttributes(),
217  T, TSI, MethodImplKind);
218  if (lexicalDC)
219  Res->setLexicalDeclContext(lexicalDC);
220  }
221 
222  // Validate the attributes on the @property.
223  CheckObjCPropertyAttributes(Res, AtLoc, Attributes,
224  (isa<ObjCInterfaceDecl>(ClassDecl) ||
225  isa<ObjCProtocolDecl>(ClassDecl)));
226 
227  // Check consistency if the type has explicit ownership qualification.
228  if (Res->getType().getObjCLifetime())
229  checkPropertyDeclWithOwnership(*this, Res);
230 
231  llvm::SmallPtrSet<ObjCProtocolDecl *, 16> KnownProtos;
232  if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
233  // For a class, compare the property against a property in our superclass.
234  bool FoundInSuper = false;
235  ObjCInterfaceDecl *CurrentInterfaceDecl = IFace;
236  while (ObjCInterfaceDecl *Super = CurrentInterfaceDecl->getSuperClass()) {
237  DeclContext::lookup_result R = Super->lookup(Res->getDeclName());
238  for (unsigned I = 0, N = R.size(); I != N; ++I) {
239  if (ObjCPropertyDecl *SuperProp = dyn_cast<ObjCPropertyDecl>(R[I])) {
240  DiagnosePropertyMismatch(Res, SuperProp, Super->getIdentifier(), false);
241  FoundInSuper = true;
242  break;
243  }
244  }
245  if (FoundInSuper)
246  break;
247  else
248  CurrentInterfaceDecl = Super;
249  }
250 
251  if (FoundInSuper) {
252  // Also compare the property against a property in our protocols.
253  for (auto *P : CurrentInterfaceDecl->protocols()) {
254  CheckPropertyAgainstProtocol(*this, Res, P, KnownProtos);
255  }
256  } else {
257  // Slower path: look in all protocols we referenced.
258  for (auto *P : IFace->all_referenced_protocols()) {
259  CheckPropertyAgainstProtocol(*this, Res, P, KnownProtos);
260  }
261  }
262  } else if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
263  // We don't check if class extension. Because properties in class extension
264  // are meant to override some of the attributes and checking has already done
265  // when property in class extension is constructed.
266  if (!Cat->IsClassExtension())
267  for (auto *P : Cat->protocols())
268  CheckPropertyAgainstProtocol(*this, Res, P, KnownProtos);
269  } else {
270  ObjCProtocolDecl *Proto = cast<ObjCProtocolDecl>(ClassDecl);
271  for (auto *P : Proto->protocols())
272  CheckPropertyAgainstProtocol(*this, Res, P, KnownProtos);
273  }
274 
276  return Res;
277 }
278 
280 makePropertyAttributesAsWritten(unsigned Attributes) {
281  unsigned attributesAsWritten = 0;
282  if (Attributes & ObjCDeclSpec::DQ_PR_readonly)
283  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_readonly;
284  if (Attributes & ObjCDeclSpec::DQ_PR_readwrite)
285  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_readwrite;
286  if (Attributes & ObjCDeclSpec::DQ_PR_getter)
287  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_getter;
288  if (Attributes & ObjCDeclSpec::DQ_PR_setter)
289  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_setter;
290  if (Attributes & ObjCDeclSpec::DQ_PR_assign)
291  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_assign;
292  if (Attributes & ObjCDeclSpec::DQ_PR_retain)
293  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_retain;
294  if (Attributes & ObjCDeclSpec::DQ_PR_strong)
295  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_strong;
296  if (Attributes & ObjCDeclSpec::DQ_PR_weak)
297  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_weak;
298  if (Attributes & ObjCDeclSpec::DQ_PR_copy)
299  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_copy;
300  if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained)
301  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_unsafe_unretained;
302  if (Attributes & ObjCDeclSpec::DQ_PR_nonatomic)
303  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_nonatomic;
304  if (Attributes & ObjCDeclSpec::DQ_PR_atomic)
305  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_atomic;
306  if (Attributes & ObjCDeclSpec::DQ_PR_class)
307  attributesAsWritten |= ObjCPropertyDecl::OBJC_PR_class;
308 
309  return (ObjCPropertyDecl::PropertyAttributeKind)attributesAsWritten;
310 }
311 
312 static bool LocPropertyAttribute( ASTContext &Context, const char *attrName,
313  SourceLocation LParenLoc, SourceLocation &Loc) {
314  if (LParenLoc.isMacroID())
315  return false;
316 
317  SourceManager &SM = Context.getSourceManager();
318  std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(LParenLoc);
319  // Try to load the file buffer.
320  bool invalidTemp = false;
321  StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
322  if (invalidTemp)
323  return false;
324  const char *tokenBegin = file.data() + locInfo.second;
325 
326  // Lex from the start of the given location.
327  Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
328  Context.getLangOpts(),
329  file.begin(), tokenBegin, file.end());
330  Token Tok;
331  do {
332  lexer.LexFromRawLexer(Tok);
333  if (Tok.is(tok::raw_identifier) && Tok.getRawIdentifier() == attrName) {
334  Loc = Tok.getLocation();
335  return true;
336  }
337  } while (Tok.isNot(tok::r_paren));
338  return false;
339 }
340 
341 /// Check for a mismatch in the atomicity of the given properties.
343  ObjCPropertyDecl *OldProperty,
344  ObjCPropertyDecl *NewProperty,
345  bool PropagateAtomicity) {
346  // If the atomicity of both matches, we're done.
347  bool OldIsAtomic =
349  == 0;
350  bool NewIsAtomic =
352  == 0;
353  if (OldIsAtomic == NewIsAtomic) return;
354 
355  // Determine whether the given property is readonly and implicitly
356  // atomic.
357  auto isImplicitlyReadonlyAtomic = [](ObjCPropertyDecl *Property) -> bool {
358  // Is it readonly?
359  auto Attrs = Property->getPropertyAttributes();
360  if ((Attrs & ObjCPropertyDecl::OBJC_PR_readonly) == 0) return false;
361 
362  // Is it nonatomic?
363  if (Attrs & ObjCPropertyDecl::OBJC_PR_nonatomic) return false;
364 
365  // Was 'atomic' specified directly?
366  if (Property->getPropertyAttributesAsWritten() &
368  return false;
369 
370  return true;
371  };
372 
373  // If we're allowed to propagate atomicity, and the new property did
374  // not specify atomicity at all, propagate.
375  const unsigned AtomicityMask =
377  if (PropagateAtomicity &&
378  ((NewProperty->getPropertyAttributesAsWritten() & AtomicityMask) == 0)) {
379  unsigned Attrs = NewProperty->getPropertyAttributes();
380  Attrs = Attrs & ~AtomicityMask;
381  if (OldIsAtomic)
383  else
385 
386  NewProperty->overwritePropertyAttributes(Attrs);
387  return;
388  }
389 
390  // One of the properties is atomic; if it's a readonly property, and
391  // 'atomic' wasn't explicitly specified, we're okay.
392  if ((OldIsAtomic && isImplicitlyReadonlyAtomic(OldProperty)) ||
393  (NewIsAtomic && isImplicitlyReadonlyAtomic(NewProperty)))
394  return;
395 
396  // Diagnose the conflict.
397  const IdentifierInfo *OldContextName;
398  auto *OldDC = OldProperty->getDeclContext();
399  if (auto Category = dyn_cast<ObjCCategoryDecl>(OldDC))
400  OldContextName = Category->getClassInterface()->getIdentifier();
401  else
402  OldContextName = cast<ObjCContainerDecl>(OldDC)->getIdentifier();
403 
404  S.Diag(NewProperty->getLocation(), diag::warn_property_attribute)
405  << NewProperty->getDeclName() << "atomic"
406  << OldContextName;
407  S.Diag(OldProperty->getLocation(), diag::note_property_declare);
408 }
409 
412  SourceLocation AtLoc,
413  SourceLocation LParenLoc,
414  FieldDeclarator &FD,
415  Selector GetterSel, Selector SetterSel,
416  const bool isReadWrite,
417  unsigned &Attributes,
418  const unsigned AttributesAsWritten,
419  QualType T,
420  TypeSourceInfo *TSI,
421  tok::ObjCKeywordKind MethodImplKind) {
422  ObjCCategoryDecl *CDecl = cast<ObjCCategoryDecl>(CurContext);
423  // Diagnose if this property is already in continuation class.
424  DeclContext *DC = CurContext;
425  IdentifierInfo *PropertyId = FD.D.getIdentifier();
426  ObjCInterfaceDecl *CCPrimary = CDecl->getClassInterface();
427 
428  // We need to look in the @interface to see if the @property was
429  // already declared.
430  if (!CCPrimary) {
431  Diag(CDecl->getLocation(), diag::err_continuation_class);
432  return nullptr;
433  }
434 
435  bool isClassProperty = (AttributesAsWritten & ObjCDeclSpec::DQ_PR_class) ||
436  (Attributes & ObjCDeclSpec::DQ_PR_class);
437 
438  // Find the property in the extended class's primary class or
439  // extensions.
441  PropertyId, ObjCPropertyDecl::getQueryKind(isClassProperty));
442 
443  // If we found a property in an extension, complain.
444  if (PIDecl && isa<ObjCCategoryDecl>(PIDecl->getDeclContext())) {
445  Diag(AtLoc, diag::err_duplicate_property);
446  Diag(PIDecl->getLocation(), diag::note_property_declare);
447  return nullptr;
448  }
449 
450  // Check for consistency with the previous declaration, if there is one.
451  if (PIDecl) {
452  // A readonly property declared in the primary class can be refined
453  // by adding a readwrite property within an extension.
454  // Anything else is an error.
455  if (!(PIDecl->isReadOnly() && isReadWrite)) {
456  // Tailor the diagnostics for the common case where a readwrite
457  // property is declared both in the @interface and the continuation.
458  // This is a common error where the user often intended the original
459  // declaration to be readonly.
460  unsigned diag =
461  (Attributes & ObjCDeclSpec::DQ_PR_readwrite) &&
462  (PIDecl->getPropertyAttributesAsWritten() &
464  ? diag::err_use_continuation_class_redeclaration_readwrite
465  : diag::err_use_continuation_class;
466  Diag(AtLoc, diag)
467  << CCPrimary->getDeclName();
468  Diag(PIDecl->getLocation(), diag::note_property_declare);
469  return nullptr;
470  }
471 
472  // Check for consistency of getters.
473  if (PIDecl->getGetterName() != GetterSel) {
474  // If the getter was written explicitly, complain.
475  if (AttributesAsWritten & ObjCDeclSpec::DQ_PR_getter) {
476  Diag(AtLoc, diag::warn_property_redecl_getter_mismatch)
477  << PIDecl->getGetterName() << GetterSel;
478  Diag(PIDecl->getLocation(), diag::note_property_declare);
479  }
480 
481  // Always adopt the getter from the original declaration.
482  GetterSel = PIDecl->getGetterName();
483  Attributes |= ObjCDeclSpec::DQ_PR_getter;
484  }
485 
486  // Check consistency of ownership.
487  unsigned ExistingOwnership
489  unsigned NewOwnership = getOwnershipRule(Attributes);
490  if (ExistingOwnership && NewOwnership != ExistingOwnership) {
491  // If the ownership was written explicitly, complain.
492  if (getOwnershipRule(AttributesAsWritten)) {
493  Diag(AtLoc, diag::warn_property_attr_mismatch);
494  Diag(PIDecl->getLocation(), diag::note_property_declare);
495  }
496 
497  // Take the ownership from the original property.
498  Attributes = (Attributes & ~OwnershipMask) | ExistingOwnership;
499  }
500 
501  // If the redeclaration is 'weak' but the original property is not,
502  if ((Attributes & ObjCPropertyDecl::OBJC_PR_weak) &&
505  PIDecl->getType()->getAs<ObjCObjectPointerType>() &&
507  Diag(AtLoc, diag::warn_property_implicitly_mismatched);
508  Diag(PIDecl->getLocation(), diag::note_property_declare);
509  }
510  }
511 
512  // Create a new ObjCPropertyDecl with the DeclContext being
513  // the class extension.
514  ObjCPropertyDecl *PDecl = CreatePropertyDecl(S, CDecl, AtLoc, LParenLoc,
515  FD, GetterSel, SetterSel,
516  isReadWrite,
517  Attributes, AttributesAsWritten,
518  T, TSI, MethodImplKind, DC);
519 
520  // If there was no declaration of a property with the same name in
521  // the primary class, we're done.
522  if (!PIDecl) {
523  ProcessPropertyDecl(PDecl);
524  return PDecl;
525  }
526 
527  if (!Context.hasSameType(PIDecl->getType(), PDecl->getType())) {
528  bool IncompatibleObjC = false;
529  QualType ConvertedType;
530  // Relax the strict type matching for property type in continuation class.
531  // Allow property object type of continuation class to be different as long
532  // as it narrows the object type in its primary class property. Note that
533  // this conversion is safe only because the wider type is for a 'readonly'
534  // property in primary class and 'narrowed' type for a 'readwrite' property
535  // in continuation class.
536  QualType PrimaryClassPropertyT = Context.getCanonicalType(PIDecl->getType());
537  QualType ClassExtPropertyT = Context.getCanonicalType(PDecl->getType());
538  if (!isa<ObjCObjectPointerType>(PrimaryClassPropertyT) ||
539  !isa<ObjCObjectPointerType>(ClassExtPropertyT) ||
540  (!isObjCPointerConversion(ClassExtPropertyT, PrimaryClassPropertyT,
541  ConvertedType, IncompatibleObjC))
542  || IncompatibleObjC) {
543  Diag(AtLoc,
544  diag::err_type_mismatch_continuation_class) << PDecl->getType();
545  Diag(PIDecl->getLocation(), diag::note_property_declare);
546  return nullptr;
547  }
548  }
549 
550  // Check that atomicity of property in class extension matches the previous
551  // declaration.
552  checkAtomicPropertyMismatch(*this, PIDecl, PDecl, true);
553 
554  // Make sure getter/setter are appropriately synthesized.
555  ProcessPropertyDecl(PDecl);
556  return PDecl;
557 }
558 
560  ObjCContainerDecl *CDecl,
561  SourceLocation AtLoc,
562  SourceLocation LParenLoc,
563  FieldDeclarator &FD,
564  Selector GetterSel,
565  Selector SetterSel,
566  const bool isReadWrite,
567  const unsigned Attributes,
568  const unsigned AttributesAsWritten,
569  QualType T,
570  TypeSourceInfo *TInfo,
571  tok::ObjCKeywordKind MethodImplKind,
572  DeclContext *lexicalDC){
573  IdentifierInfo *PropertyId = FD.D.getIdentifier();
574 
575  // Property defaults to 'assign' if it is readwrite, unless this is ARC
576  // and the type is retainable.
577  bool isAssign;
578  if (Attributes & (ObjCDeclSpec::DQ_PR_assign |
580  isAssign = true;
581  } else if (getOwnershipRule(Attributes) || !isReadWrite) {
582  isAssign = false;
583  } else {
584  isAssign = (!getLangOpts().ObjCAutoRefCount ||
585  !T->isObjCRetainableType());
586  }
587 
588  // Issue a warning if property is 'assign' as default and its
589  // object, which is gc'able conforms to NSCopying protocol
590  if (getLangOpts().getGC() != LangOptions::NonGC &&
591  isAssign && !(Attributes & ObjCDeclSpec::DQ_PR_assign)) {
592  if (const ObjCObjectPointerType *ObjPtrTy =
594  ObjCInterfaceDecl *IDecl = ObjPtrTy->getObjectType()->getInterface();
595  if (IDecl)
596  if (ObjCProtocolDecl* PNSCopying =
597  LookupProtocol(&Context.Idents.get("NSCopying"), AtLoc))
598  if (IDecl->ClassImplementsProtocol(PNSCopying, true))
599  Diag(AtLoc, diag::warn_implements_nscopying) << PropertyId;
600  }
601  }
602 
603  if (T->isObjCObjectType()) {
604  SourceLocation StarLoc = TInfo->getTypeLoc().getLocEnd();
605  StarLoc = getLocForEndOfToken(StarLoc);
606  Diag(FD.D.getIdentifierLoc(), diag::err_statically_allocated_object)
607  << FixItHint::CreateInsertion(StarLoc, "*");
609  SourceLocation TLoc = TInfo->getTypeLoc().getLocStart();
610  TInfo = Context.getTrivialTypeSourceInfo(T, TLoc);
611  }
612 
613  DeclContext *DC = cast<DeclContext>(CDecl);
615  FD.D.getIdentifierLoc(),
616  PropertyId, AtLoc,
617  LParenLoc, T, TInfo);
618 
619  bool isClassProperty = (AttributesAsWritten & ObjCDeclSpec::DQ_PR_class) ||
620  (Attributes & ObjCDeclSpec::DQ_PR_class);
621  // Class property and instance property can have the same name.
623  DC, PropertyId, ObjCPropertyDecl::getQueryKind(isClassProperty))) {
624  Diag(PDecl->getLocation(), diag::err_duplicate_property);
625  Diag(prevDecl->getLocation(), diag::note_property_declare);
626  PDecl->setInvalidDecl();
627  }
628  else {
629  DC->addDecl(PDecl);
630  if (lexicalDC)
631  PDecl->setLexicalDeclContext(lexicalDC);
632  }
633 
634  if (T->isArrayType() || T->isFunctionType()) {
635  Diag(AtLoc, diag::err_property_type) << T;
636  PDecl->setInvalidDecl();
637  }
638 
639  ProcessDeclAttributes(S, PDecl, FD.D);
640 
641  // Regardless of setter/getter attribute, we save the default getter/setter
642  // selector names in anticipation of declaration of setter/getter methods.
643  PDecl->setGetterName(GetterSel);
644  PDecl->setSetterName(SetterSel);
645  PDecl->setPropertyAttributesAsWritten(
646  makePropertyAttributesAsWritten(AttributesAsWritten));
647 
648  if (Attributes & ObjCDeclSpec::DQ_PR_readonly)
649  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readonly);
650 
651  if (Attributes & ObjCDeclSpec::DQ_PR_getter)
652  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_getter);
653 
654  if (Attributes & ObjCDeclSpec::DQ_PR_setter)
655  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_setter);
656 
657  if (isReadWrite)
658  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readwrite);
659 
660  if (Attributes & ObjCDeclSpec::DQ_PR_retain)
661  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain);
662 
663  if (Attributes & ObjCDeclSpec::DQ_PR_strong)
664  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
665 
666  if (Attributes & ObjCDeclSpec::DQ_PR_weak)
667  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_weak);
668 
669  if (Attributes & ObjCDeclSpec::DQ_PR_copy)
670  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy);
671 
672  if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained)
673  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_unsafe_unretained);
674 
675  if (isAssign)
676  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign);
677 
678  // In the semantic attributes, one of nonatomic or atomic is always set.
679  if (Attributes & ObjCDeclSpec::DQ_PR_nonatomic)
680  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_nonatomic);
681  else
682  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_atomic);
683 
684  // 'unsafe_unretained' is alias for 'assign'.
685  if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained)
686  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign);
687  if (isAssign)
688  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_unsafe_unretained);
689 
690  if (MethodImplKind == tok::objc_required)
691  PDecl->setPropertyImplementation(ObjCPropertyDecl::Required);
692  else if (MethodImplKind == tok::objc_optional)
693  PDecl->setPropertyImplementation(ObjCPropertyDecl::Optional);
694 
695  if (Attributes & ObjCDeclSpec::DQ_PR_nullability)
696  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_nullability);
697 
698  if (Attributes & ObjCDeclSpec::DQ_PR_null_resettable)
699  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_null_resettable);
700 
701  if (Attributes & ObjCDeclSpec::DQ_PR_class)
702  PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_class);
703 
704  return PDecl;
705 }
706 
707 static void checkARCPropertyImpl(Sema &S, SourceLocation propertyImplLoc,
708  ObjCPropertyDecl *property,
709  ObjCIvarDecl *ivar) {
710  if (property->isInvalidDecl() || ivar->isInvalidDecl()) return;
711 
712  QualType ivarType = ivar->getType();
713  Qualifiers::ObjCLifetime ivarLifetime = ivarType.getObjCLifetime();
714 
715  // The lifetime implied by the property's attributes.
716  Qualifiers::ObjCLifetime propertyLifetime =
718  property->getType());
719 
720  // We're fine if they match.
721  if (propertyLifetime == ivarLifetime) return;
722 
723  // None isn't a valid lifetime for an object ivar in ARC, and
724  // __autoreleasing is never valid; don't diagnose twice.
725  if ((ivarLifetime == Qualifiers::OCL_None &&
726  S.getLangOpts().ObjCAutoRefCount) ||
727  ivarLifetime == Qualifiers::OCL_Autoreleasing)
728  return;
729 
730  // If the ivar is private, and it's implicitly __unsafe_unretained
731  // becaues of its type, then pretend it was actually implicitly
732  // __strong. This is only sound because we're processing the
733  // property implementation before parsing any method bodies.
734  if (ivarLifetime == Qualifiers::OCL_ExplicitNone &&
735  propertyLifetime == Qualifiers::OCL_Strong &&
737  SplitQualType split = ivarType.split();
738  if (split.Quals.hasObjCLifetime()) {
739  assert(ivarType->isObjCARCImplicitlyUnretainedType());
741  ivarType = S.Context.getQualifiedType(split);
742  ivar->setType(ivarType);
743  return;
744  }
745  }
746 
747  switch (propertyLifetime) {
749  S.Diag(ivar->getLocation(), diag::err_arc_strong_property_ownership)
750  << property->getDeclName()
751  << ivar->getDeclName()
752  << ivarLifetime;
753  break;
754 
756  S.Diag(ivar->getLocation(), diag::error_weak_property)
757  << property->getDeclName()
758  << ivar->getDeclName();
759  break;
760 
762  S.Diag(ivar->getLocation(), diag::err_arc_assign_property_ownership)
763  << property->getDeclName()
764  << ivar->getDeclName()
765  << ((property->getPropertyAttributesAsWritten()
767  break;
768 
770  llvm_unreachable("properties cannot be autoreleasing");
771 
773  // Any other property should be ignored.
774  return;
775  }
776 
777  S.Diag(property->getLocation(), diag::note_property_declare);
778  if (propertyImplLoc.isValid())
779  S.Diag(propertyImplLoc, diag::note_property_synthesize);
780 }
781 
782 /// setImpliedPropertyAttributeForReadOnlyProperty -
783 /// This routine evaludates life-time attributes for a 'readonly'
784 /// property with no known lifetime of its own, using backing
785 /// 'ivar's attribute, if any. If no backing 'ivar', property's
786 /// life-time is assumed 'strong'.
788  ObjCPropertyDecl *property, ObjCIvarDecl *ivar) {
789  Qualifiers::ObjCLifetime propertyLifetime =
791  property->getType());
792  if (propertyLifetime != Qualifiers::OCL_None)
793  return;
794 
795  if (!ivar) {
796  // if no backing ivar, make property 'strong'.
797  property->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
798  return;
799  }
800  // property assumes owenership of backing ivar.
801  QualType ivarType = ivar->getType();
802  Qualifiers::ObjCLifetime ivarLifetime = ivarType.getObjCLifetime();
803  if (ivarLifetime == Qualifiers::OCL_Strong)
804  property->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_strong);
805  else if (ivarLifetime == Qualifiers::OCL_Weak)
806  property->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_weak);
807 }
808 
809 /// DiagnosePropertyMismatchDeclInProtocols - diagnose properties declared
810 /// in inherited protocols with mismatched types. Since any of them can
811 /// be candidate for synthesis.
812 static void
814  ObjCInterfaceDecl *ClassDecl,
817  for (const auto *PI : ClassDecl->all_referenced_protocols()) {
818  if (const ObjCProtocolDecl *PDecl = PI->getDefinition())
819  PDecl->collectInheritedProtocolProperties(Property, PropMap);
820  }
821  if (ObjCInterfaceDecl *SDecl = ClassDecl->getSuperClass())
822  while (SDecl) {
823  for (const auto *PI : SDecl->all_referenced_protocols()) {
824  if (const ObjCProtocolDecl *PDecl = PI->getDefinition())
825  PDecl->collectInheritedProtocolProperties(Property, PropMap);
826  }
827  SDecl = SDecl->getSuperClass();
828  }
829 
830  if (PropMap.empty())
831  return;
832 
833  QualType RHSType = S.Context.getCanonicalType(Property->getType());
834  bool FirsTime = true;
835  for (ObjCInterfaceDecl::ProtocolPropertyMap::iterator
836  I = PropMap.begin(), E = PropMap.end(); I != E; I++) {
837  ObjCPropertyDecl *Prop = I->second;
838  QualType LHSType = S.Context.getCanonicalType(Prop->getType());
839  if (!S.Context.propertyTypesAreCompatible(LHSType, RHSType)) {
840  bool IncompatibleObjC = false;
841  QualType ConvertedType;
842  if (!S.isObjCPointerConversion(RHSType, LHSType, ConvertedType, IncompatibleObjC)
843  || IncompatibleObjC) {
844  if (FirsTime) {
845  S.Diag(Property->getLocation(), diag::warn_protocol_property_mismatch)
846  << Property->getType();
847  FirsTime = false;
848  }
849  S.Diag(Prop->getLocation(), diag::note_protocol_property_declare)
850  << Prop->getType();
851  }
852  }
853  }
854  if (!FirsTime && AtLoc.isValid())
855  S.Diag(AtLoc, diag::note_property_synthesize);
856 }
857 
858 /// Determine whether any storage attributes were written on the property.
860  ObjCPropertyQueryKind QueryKind) {
861  if (Prop->getPropertyAttributesAsWritten() & OwnershipMask) return true;
862 
863  // If this is a readwrite property in a class extension that refines
864  // a readonly property in the original class definition, check it as
865  // well.
866 
867  // If it's a readonly property, we're not interested.
868  if (Prop->isReadOnly()) return false;
869 
870  // Is it declared in an extension?
871  auto Category = dyn_cast<ObjCCategoryDecl>(Prop->getDeclContext());
872  if (!Category || !Category->IsClassExtension()) return false;
873 
874  // Find the corresponding property in the primary class definition.
875  auto OrigClass = Category->getClassInterface();
876  for (auto Found : OrigClass->lookup(Prop->getDeclName())) {
877  if (ObjCPropertyDecl *OrigProp = dyn_cast<ObjCPropertyDecl>(Found))
878  return OrigProp->getPropertyAttributesAsWritten() & OwnershipMask;
879  }
880 
881  // Look through all of the protocols.
882  for (const auto *Proto : OrigClass->all_referenced_protocols()) {
883  if (ObjCPropertyDecl *OrigProp = Proto->FindPropertyDeclaration(
884  Prop->getIdentifier(), QueryKind))
885  return OrigProp->getPropertyAttributesAsWritten() & OwnershipMask;
886  }
887 
888  return false;
889 }
890 
891 /// ActOnPropertyImplDecl - This routine performs semantic checks and
892 /// builds the AST node for a property implementation declaration; declared
893 /// as \@synthesize or \@dynamic.
894 ///
896  SourceLocation AtLoc,
897  SourceLocation PropertyLoc,
898  bool Synthesize,
899  IdentifierInfo *PropertyId,
900  IdentifierInfo *PropertyIvar,
901  SourceLocation PropertyIvarLoc,
902  ObjCPropertyQueryKind QueryKind) {
903  ObjCContainerDecl *ClassImpDecl =
904  dyn_cast<ObjCContainerDecl>(CurContext);
905  // Make sure we have a context for the property implementation declaration.
906  if (!ClassImpDecl) {
907  Diag(AtLoc, diag::error_missing_property_context);
908  return nullptr;
909  }
910  if (PropertyIvarLoc.isInvalid())
911  PropertyIvarLoc = PropertyLoc;
912  SourceLocation PropertyDiagLoc = PropertyLoc;
913  if (PropertyDiagLoc.isInvalid())
914  PropertyDiagLoc = ClassImpDecl->getLocStart();
915  ObjCPropertyDecl *property = nullptr;
916  ObjCInterfaceDecl *IDecl = nullptr;
917  // Find the class or category class where this property must have
918  // a declaration.
919  ObjCImplementationDecl *IC = nullptr;
920  ObjCCategoryImplDecl *CatImplClass = nullptr;
921  if ((IC = dyn_cast<ObjCImplementationDecl>(ClassImpDecl))) {
922  IDecl = IC->getClassInterface();
923  // We always synthesize an interface for an implementation
924  // without an interface decl. So, IDecl is always non-zero.
925  assert(IDecl &&
926  "ActOnPropertyImplDecl - @implementation without @interface");
927 
928  // Look for this property declaration in the @implementation's @interface
929  property = IDecl->FindPropertyDeclaration(PropertyId, QueryKind);
930  if (!property) {
931  Diag(PropertyLoc, diag::error_bad_property_decl) << IDecl->getDeclName();
932  return nullptr;
933  }
934  if (property->isClassProperty() && Synthesize) {
935  Diag(PropertyLoc, diag::error_synthesize_on_class_property) << PropertyId;
936  return nullptr;
937  }
938  unsigned PIkind = property->getPropertyAttributesAsWritten();
939  if ((PIkind & (ObjCPropertyDecl::OBJC_PR_atomic |
941  if (AtLoc.isValid())
942  Diag(AtLoc, diag::warn_implicit_atomic_property);
943  else
944  Diag(IC->getLocation(), diag::warn_auto_implicit_atomic_property);
945  Diag(property->getLocation(), diag::note_property_declare);
946  }
947 
948  if (const ObjCCategoryDecl *CD =
949  dyn_cast<ObjCCategoryDecl>(property->getDeclContext())) {
950  if (!CD->IsClassExtension()) {
951  Diag(PropertyLoc, diag::error_category_property) << CD->getDeclName();
952  Diag(property->getLocation(), diag::note_property_declare);
953  return nullptr;
954  }
955  }
956  if (Synthesize&&
958  property->hasAttr<IBOutletAttr>() &&
959  !AtLoc.isValid()) {
960  bool ReadWriteProperty = false;
961  // Search into the class extensions and see if 'readonly property is
962  // redeclared 'readwrite', then no warning is to be issued.
963  for (auto *Ext : IDecl->known_extensions()) {
964  DeclContext::lookup_result R = Ext->lookup(property->getDeclName());
965  if (!R.empty())
966  if (ObjCPropertyDecl *ExtProp = dyn_cast<ObjCPropertyDecl>(R[0])) {
967  PIkind = ExtProp->getPropertyAttributesAsWritten();
969  ReadWriteProperty = true;
970  break;
971  }
972  }
973  }
974 
975  if (!ReadWriteProperty) {
976  Diag(property->getLocation(), diag::warn_auto_readonly_iboutlet_property)
977  << property;
978  SourceLocation readonlyLoc;
979  if (LocPropertyAttribute(Context, "readonly",
980  property->getLParenLoc(), readonlyLoc)) {
981  SourceLocation endLoc =
982  readonlyLoc.getLocWithOffset(strlen("readonly")-1);
983  SourceRange ReadonlySourceRange(readonlyLoc, endLoc);
984  Diag(property->getLocation(),
985  diag::note_auto_readonly_iboutlet_fixup_suggest) <<
986  FixItHint::CreateReplacement(ReadonlySourceRange, "readwrite");
987  }
988  }
989  }
990  if (Synthesize && isa<ObjCProtocolDecl>(property->getDeclContext()))
991  DiagnosePropertyMismatchDeclInProtocols(*this, AtLoc, IDecl, property);
992 
993  } else if ((CatImplClass = dyn_cast<ObjCCategoryImplDecl>(ClassImpDecl))) {
994  if (Synthesize) {
995  Diag(AtLoc, diag::error_synthesize_category_decl);
996  return nullptr;
997  }
998  IDecl = CatImplClass->getClassInterface();
999  if (!IDecl) {
1000  Diag(AtLoc, diag::error_missing_property_interface);
1001  return nullptr;
1002  }
1004  IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier());
1005 
1006  // If category for this implementation not found, it is an error which
1007  // has already been reported eralier.
1008  if (!Category)
1009  return nullptr;
1010  // Look for this property declaration in @implementation's category
1011  property = Category->FindPropertyDeclaration(PropertyId, QueryKind);
1012  if (!property) {
1013  Diag(PropertyLoc, diag::error_bad_category_property_decl)
1014  << Category->getDeclName();
1015  return nullptr;
1016  }
1017  } else {
1018  Diag(AtLoc, diag::error_bad_property_context);
1019  return nullptr;
1020  }
1021  ObjCIvarDecl *Ivar = nullptr;
1022  bool CompleteTypeErr = false;
1023  bool compat = true;
1024  // Check that we have a valid, previously declared ivar for @synthesize
1025  if (Synthesize) {
1026  // @synthesize
1027  if (!PropertyIvar)
1028  PropertyIvar = PropertyId;
1029  // Check that this is a previously declared 'ivar' in 'IDecl' interface
1030  ObjCInterfaceDecl *ClassDeclared;
1031  Ivar = IDecl->lookupInstanceVariable(PropertyIvar, ClassDeclared);
1032  QualType PropType = property->getType();
1033  QualType PropertyIvarType = PropType.getNonReferenceType();
1034 
1035  if (RequireCompleteType(PropertyDiagLoc, PropertyIvarType,
1036  diag::err_incomplete_synthesized_property,
1037  property->getDeclName())) {
1038  Diag(property->getLocation(), diag::note_property_declare);
1039  CompleteTypeErr = true;
1040  }
1041 
1042  if (getLangOpts().ObjCAutoRefCount &&
1043  (property->getPropertyAttributesAsWritten() &
1045  PropertyIvarType->isObjCRetainableType()) {
1047  }
1048 
1050  = property->getPropertyAttributes();
1051 
1052  bool isARCWeak = false;
1053  if (kind & ObjCPropertyDecl::OBJC_PR_weak) {
1054  // Add GC __weak to the ivar type if the property is weak.
1055  if (getLangOpts().getGC() != LangOptions::NonGC) {
1056  assert(!getLangOpts().ObjCAutoRefCount);
1057  if (PropertyIvarType.isObjCGCStrong()) {
1058  Diag(PropertyDiagLoc, diag::err_gc_weak_property_strong_type);
1059  Diag(property->getLocation(), diag::note_property_declare);
1060  } else {
1061  PropertyIvarType =
1062  Context.getObjCGCQualType(PropertyIvarType, Qualifiers::Weak);
1063  }
1064 
1065  // Otherwise, check whether ARC __weak is enabled and works with
1066  // the property type.
1067  } else {
1068  if (!getLangOpts().ObjCWeak) {
1069  // Only complain here when synthesizing an ivar.
1070  if (!Ivar) {
1071  Diag(PropertyDiagLoc,
1072  getLangOpts().ObjCWeakRuntime
1073  ? diag::err_synthesizing_arc_weak_property_disabled
1074  : diag::err_synthesizing_arc_weak_property_no_runtime);
1075  Diag(property->getLocation(), diag::note_property_declare);
1076  }
1077  CompleteTypeErr = true; // suppress later diagnostics about the ivar
1078  } else {
1079  isARCWeak = true;
1080  if (const ObjCObjectPointerType *ObjT =
1081  PropertyIvarType->getAs<ObjCObjectPointerType>()) {
1082  const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl();
1083  if (ObjI && ObjI->isArcWeakrefUnavailable()) {
1084  Diag(property->getLocation(),
1085  diag::err_arc_weak_unavailable_property)
1086  << PropertyIvarType;
1087  Diag(ClassImpDecl->getLocation(), diag::note_implemented_by_class)
1088  << ClassImpDecl->getName();
1089  }
1090  }
1091  }
1092  }
1093  }
1094 
1095  if (AtLoc.isInvalid()) {
1096  // Check when default synthesizing a property that there is
1097  // an ivar matching property name and issue warning; since this
1098  // is the most common case of not using an ivar used for backing
1099  // property in non-default synthesis case.
1100  ObjCInterfaceDecl *ClassDeclared=nullptr;
1101  ObjCIvarDecl *originalIvar =
1102  IDecl->lookupInstanceVariable(property->getIdentifier(),
1103  ClassDeclared);
1104  if (originalIvar) {
1105  Diag(PropertyDiagLoc,
1106  diag::warn_autosynthesis_property_ivar_match)
1107  << PropertyId << (Ivar == nullptr) << PropertyIvar
1108  << originalIvar->getIdentifier();
1109  Diag(property->getLocation(), diag::note_property_declare);
1110  Diag(originalIvar->getLocation(), diag::note_ivar_decl);
1111  }
1112  }
1113 
1114  if (!Ivar) {
1115  // In ARC, give the ivar a lifetime qualifier based on the
1116  // property attributes.
1117  if ((getLangOpts().ObjCAutoRefCount || isARCWeak) &&
1118  !PropertyIvarType.getObjCLifetime() &&
1119  PropertyIvarType->isObjCRetainableType()) {
1120 
1121  // It's an error if we have to do this and the user didn't
1122  // explicitly write an ownership attribute on the property.
1123  if (!hasWrittenStorageAttribute(property, QueryKind) &&
1125  Diag(PropertyDiagLoc,
1126  diag::err_arc_objc_property_default_assign_on_object);
1127  Diag(property->getLocation(), diag::note_property_declare);
1128  } else {
1129  Qualifiers::ObjCLifetime lifetime =
1130  getImpliedARCOwnership(kind, PropertyIvarType);
1131  assert(lifetime && "no lifetime for property?");
1132 
1133  Qualifiers qs;
1134  qs.addObjCLifetime(lifetime);
1135  PropertyIvarType = Context.getQualifiedType(PropertyIvarType, qs);
1136  }
1137  }
1138 
1139  Ivar = ObjCIvarDecl::Create(Context, ClassImpDecl,
1140  PropertyIvarLoc,PropertyIvarLoc, PropertyIvar,
1141  PropertyIvarType, /*Dinfo=*/nullptr,
1143  (Expr *)nullptr, true);
1144  if (RequireNonAbstractType(PropertyIvarLoc,
1145  PropertyIvarType,
1146  diag::err_abstract_type_in_decl,
1148  Diag(property->getLocation(), diag::note_property_declare);
1149  Ivar->setInvalidDecl();
1150  } else if (CompleteTypeErr)
1151  Ivar->setInvalidDecl();
1152  ClassImpDecl->addDecl(Ivar);
1153  IDecl->makeDeclVisibleInContext(Ivar);
1154 
1156  Diag(PropertyDiagLoc, diag::error_missing_property_ivar_decl)
1157  << PropertyId;
1158  // Note! I deliberately want it to fall thru so, we have a
1159  // a property implementation and to avoid future warnings.
1160  } else if (getLangOpts().ObjCRuntime.isNonFragile() &&
1161  !declaresSameEntity(ClassDeclared, IDecl)) {
1162  Diag(PropertyDiagLoc, diag::error_ivar_in_superclass_use)
1163  << property->getDeclName() << Ivar->getDeclName()
1164  << ClassDeclared->getDeclName();
1165  Diag(Ivar->getLocation(), diag::note_previous_access_declaration)
1166  << Ivar << Ivar->getName();
1167  // Note! I deliberately want it to fall thru so more errors are caught.
1168  }
1169  property->setPropertyIvarDecl(Ivar);
1170 
1171  QualType IvarType = Context.getCanonicalType(Ivar->getType());
1172 
1173  // Check that type of property and its ivar are type compatible.
1174  if (!Context.hasSameType(PropertyIvarType, IvarType)) {
1175  if (isa<ObjCObjectPointerType>(PropertyIvarType)
1176  && isa<ObjCObjectPointerType>(IvarType))
1177  compat =
1179  PropertyIvarType->getAs<ObjCObjectPointerType>(),
1180  IvarType->getAs<ObjCObjectPointerType>());
1181  else {
1182  compat = (CheckAssignmentConstraints(PropertyIvarLoc, PropertyIvarType,
1183  IvarType)
1184  == Compatible);
1185  }
1186  if (!compat) {
1187  Diag(PropertyDiagLoc, diag::error_property_ivar_type)
1188  << property->getDeclName() << PropType
1189  << Ivar->getDeclName() << IvarType;
1190  Diag(Ivar->getLocation(), diag::note_ivar_decl);
1191  // Note! I deliberately want it to fall thru so, we have a
1192  // a property implementation and to avoid future warnings.
1193  }
1194  else {
1195  // FIXME! Rules for properties are somewhat different that those
1196  // for assignments. Use a new routine to consolidate all cases;
1197  // specifically for property redeclarations as well as for ivars.
1198  QualType lhsType =Context.getCanonicalType(PropertyIvarType).getUnqualifiedType();
1199  QualType rhsType =Context.getCanonicalType(IvarType).getUnqualifiedType();
1200  if (lhsType != rhsType &&
1201  lhsType->isArithmeticType()) {
1202  Diag(PropertyDiagLoc, diag::error_property_ivar_type)
1203  << property->getDeclName() << PropType
1204  << Ivar->getDeclName() << IvarType;
1205  Diag(Ivar->getLocation(), diag::note_ivar_decl);
1206  // Fall thru - see previous comment
1207  }
1208  }
1209  // __weak is explicit. So it works on Canonical type.
1210  if ((PropType.isObjCGCWeak() && !IvarType.isObjCGCWeak() &&
1211  getLangOpts().getGC() != LangOptions::NonGC)) {
1212  Diag(PropertyDiagLoc, diag::error_weak_property)
1213  << property->getDeclName() << Ivar->getDeclName();
1214  Diag(Ivar->getLocation(), diag::note_ivar_decl);
1215  // Fall thru - see previous comment
1216  }
1217  // Fall thru - see previous comment
1218  if ((property->getType()->isObjCObjectPointerType() ||
1219  PropType.isObjCGCStrong()) && IvarType.isObjCGCWeak() &&
1220  getLangOpts().getGC() != LangOptions::NonGC) {
1221  Diag(PropertyDiagLoc, diag::error_strong_property)
1222  << property->getDeclName() << Ivar->getDeclName();
1223  // Fall thru - see previous comment
1224  }
1225  }
1226  if (getLangOpts().ObjCAutoRefCount || isARCWeak ||
1227  Ivar->getType().getObjCLifetime())
1228  checkARCPropertyImpl(*this, PropertyLoc, property, Ivar);
1229  } else if (PropertyIvar)
1230  // @dynamic
1231  Diag(PropertyDiagLoc, diag::error_dynamic_property_ivar_decl);
1232 
1233  assert (property && "ActOnPropertyImplDecl - property declaration missing");
1234  ObjCPropertyImplDecl *PIDecl =
1235  ObjCPropertyImplDecl::Create(Context, CurContext, AtLoc, PropertyLoc,
1236  property,
1237  (Synthesize ?
1240  Ivar, PropertyIvarLoc);
1241 
1242  if (CompleteTypeErr || !compat)
1243  PIDecl->setInvalidDecl();
1244 
1245  if (ObjCMethodDecl *getterMethod = property->getGetterMethodDecl()) {
1246  getterMethod->createImplicitParams(Context, IDecl);
1247  if (getLangOpts().CPlusPlus && Synthesize && !CompleteTypeErr &&
1248  Ivar->getType()->isRecordType()) {
1249  // For Objective-C++, need to synthesize the AST for the IVAR object to be
1250  // returned by the getter as it must conform to C++'s copy-return rules.
1251  // FIXME. Eventually we want to do this for Objective-C as well.
1252  SynthesizedFunctionScope Scope(*this, getterMethod);
1253  ImplicitParamDecl *SelfDecl = getterMethod->getSelfDecl();
1254  DeclRefExpr *SelfExpr =
1255  new (Context) DeclRefExpr(SelfDecl, false, SelfDecl->getType(),
1256  VK_LValue, PropertyDiagLoc);
1257  MarkDeclRefReferenced(SelfExpr);
1258  Expr *LoadSelfExpr =
1260  CK_LValueToRValue, SelfExpr, nullptr,
1261  VK_RValue);
1262  Expr *IvarRefExpr =
1263  new (Context) ObjCIvarRefExpr(Ivar,
1264  Ivar->getUsageType(SelfDecl->getType()),
1265  PropertyDiagLoc,
1266  Ivar->getLocation(),
1267  LoadSelfExpr, true, true);
1269  InitializedEntity::InitializeResult(PropertyDiagLoc,
1270  getterMethod->getReturnType(),
1271  /*NRVO=*/false),
1272  PropertyDiagLoc, IvarRefExpr);
1273  if (!Res.isInvalid()) {
1274  Expr *ResExpr = Res.getAs<Expr>();
1275  if (ResExpr)
1276  ResExpr = MaybeCreateExprWithCleanups(ResExpr);
1277  PIDecl->setGetterCXXConstructor(ResExpr);
1278  }
1279  }
1280  if (property->hasAttr<NSReturnsNotRetainedAttr>() &&
1281  !getterMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
1282  Diag(getterMethod->getLocation(),
1283  diag::warn_property_getter_owning_mismatch);
1284  Diag(property->getLocation(), diag::note_property_declare);
1285  }
1286  if (getLangOpts().ObjCAutoRefCount && Synthesize)
1287  switch (getterMethod->getMethodFamily()) {
1288  case OMF_retain:
1289  case OMF_retainCount:
1290  case OMF_release:
1291  case OMF_autorelease:
1292  Diag(getterMethod->getLocation(), diag::err_arc_illegal_method_def)
1293  << 1 << getterMethod->getSelector();
1294  break;
1295  default:
1296  break;
1297  }
1298  }
1299  if (ObjCMethodDecl *setterMethod = property->getSetterMethodDecl()) {
1300  setterMethod->createImplicitParams(Context, IDecl);
1301  if (getLangOpts().CPlusPlus && Synthesize && !CompleteTypeErr &&
1302  Ivar->getType()->isRecordType()) {
1303  // FIXME. Eventually we want to do this for Objective-C as well.
1304  SynthesizedFunctionScope Scope(*this, setterMethod);
1305  ImplicitParamDecl *SelfDecl = setterMethod->getSelfDecl();
1306  DeclRefExpr *SelfExpr =
1307  new (Context) DeclRefExpr(SelfDecl, false, SelfDecl->getType(),
1308  VK_LValue, PropertyDiagLoc);
1309  MarkDeclRefReferenced(SelfExpr);
1310  Expr *LoadSelfExpr =
1312  CK_LValueToRValue, SelfExpr, nullptr,
1313  VK_RValue);
1314  Expr *lhs =
1315  new (Context) ObjCIvarRefExpr(Ivar,
1316  Ivar->getUsageType(SelfDecl->getType()),
1317  PropertyDiagLoc,
1318  Ivar->getLocation(),
1319  LoadSelfExpr, true, true);
1320  ObjCMethodDecl::param_iterator P = setterMethod->param_begin();
1321  ParmVarDecl *Param = (*P);
1322  QualType T = Param->getType().getNonReferenceType();
1323  DeclRefExpr *rhs = new (Context) DeclRefExpr(Param, false, T,
1324  VK_LValue, PropertyDiagLoc);
1325  MarkDeclRefReferenced(rhs);
1326  ExprResult Res = BuildBinOp(S, PropertyDiagLoc,
1327  BO_Assign, lhs, rhs);
1328  if (property->getPropertyAttributes() &
1330  Expr *callExpr = Res.getAs<Expr>();
1331  if (const CXXOperatorCallExpr *CXXCE =
1332  dyn_cast_or_null<CXXOperatorCallExpr>(callExpr))
1333  if (const FunctionDecl *FuncDecl = CXXCE->getDirectCallee())
1334  if (!FuncDecl->isTrivial())
1335  if (property->getType()->isReferenceType()) {
1336  Diag(PropertyDiagLoc,
1337  diag::err_atomic_property_nontrivial_assign_op)
1338  << property->getType();
1339  Diag(FuncDecl->getLocStart(),
1340  diag::note_callee_decl) << FuncDecl;
1341  }
1342  }
1343  PIDecl->setSetterCXXAssignment(Res.getAs<Expr>());
1344  }
1345  }
1346 
1347  if (IC) {
1348  if (Synthesize)
1349  if (ObjCPropertyImplDecl *PPIDecl =
1350  IC->FindPropertyImplIvarDecl(PropertyIvar)) {
1351  Diag(PropertyLoc, diag::error_duplicate_ivar_use)
1352  << PropertyId << PPIDecl->getPropertyDecl()->getIdentifier()
1353  << PropertyIvar;
1354  Diag(PPIDecl->getLocation(), diag::note_previous_use);
1355  }
1356 
1357  if (ObjCPropertyImplDecl *PPIDecl
1358  = IC->FindPropertyImplDecl(PropertyId, QueryKind)) {
1359  Diag(PropertyLoc, diag::error_property_implemented) << PropertyId;
1360  Diag(PPIDecl->getLocation(), diag::note_previous_declaration);
1361  return nullptr;
1362  }
1363  IC->addPropertyImplementation(PIDecl);
1364  if (getLangOpts().ObjCDefaultSynthProperties &&
1366  !IDecl->isObjCRequiresPropertyDefs()) {
1367  // Diagnose if an ivar was lazily synthesdized due to a previous
1368  // use and if 1) property is @dynamic or 2) property is synthesized
1369  // but it requires an ivar of different name.
1370  ObjCInterfaceDecl *ClassDeclared=nullptr;
1371  ObjCIvarDecl *Ivar = nullptr;
1372  if (!Synthesize)
1373  Ivar = IDecl->lookupInstanceVariable(PropertyId, ClassDeclared);
1374  else {
1375  if (PropertyIvar && PropertyIvar != PropertyId)
1376  Ivar = IDecl->lookupInstanceVariable(PropertyId, ClassDeclared);
1377  }
1378  // Issue diagnostics only if Ivar belongs to current class.
1379  if (Ivar && Ivar->getSynthesize() &&
1380  declaresSameEntity(IC->getClassInterface(), ClassDeclared)) {
1381  Diag(Ivar->getLocation(), diag::err_undeclared_var_use)
1382  << PropertyId;
1383  Ivar->setInvalidDecl();
1384  }
1385  }
1386  } else {
1387  if (Synthesize)
1388  if (ObjCPropertyImplDecl *PPIDecl =
1389  CatImplClass->FindPropertyImplIvarDecl(PropertyIvar)) {
1390  Diag(PropertyDiagLoc, diag::error_duplicate_ivar_use)
1391  << PropertyId << PPIDecl->getPropertyDecl()->getIdentifier()
1392  << PropertyIvar;
1393  Diag(PPIDecl->getLocation(), diag::note_previous_use);
1394  }
1395 
1396  if (ObjCPropertyImplDecl *PPIDecl =
1397  CatImplClass->FindPropertyImplDecl(PropertyId, QueryKind)) {
1398  Diag(PropertyDiagLoc, diag::error_property_implemented) << PropertyId;
1399  Diag(PPIDecl->getLocation(), diag::note_previous_declaration);
1400  return nullptr;
1401  }
1402  CatImplClass->addPropertyImplementation(PIDecl);
1403  }
1404 
1405  return PIDecl;
1406 }
1407 
1408 //===----------------------------------------------------------------------===//
1409 // Helper methods.
1410 //===----------------------------------------------------------------------===//
1411 
1412 /// DiagnosePropertyMismatch - Compares two properties for their
1413 /// attributes and types and warns on a variety of inconsistencies.
1414 ///
1415 void
1417  ObjCPropertyDecl *SuperProperty,
1418  const IdentifierInfo *inheritedName,
1419  bool OverridingProtocolProperty) {
1421  Property->getPropertyAttributes();
1423  SuperProperty->getPropertyAttributes();
1424 
1425  // We allow readonly properties without an explicit ownership
1426  // (assign/unsafe_unretained/weak/retain/strong/copy) in super class
1427  // to be overridden by a property with any explicit ownership in the subclass.
1428  if (!OverridingProtocolProperty &&
1429  !getOwnershipRule(SAttr) && getOwnershipRule(CAttr))
1430  ;
1431  else {
1434  Diag(Property->getLocation(), diag::warn_readonly_property)
1435  << Property->getDeclName() << inheritedName;
1436  if ((CAttr & ObjCPropertyDecl::OBJC_PR_copy)
1437  != (SAttr & ObjCPropertyDecl::OBJC_PR_copy))
1438  Diag(Property->getLocation(), diag::warn_property_attribute)
1439  << Property->getDeclName() << "copy" << inheritedName;
1440  else if (!(SAttr & ObjCPropertyDecl::OBJC_PR_readonly)){
1441  unsigned CAttrRetain =
1442  (CAttr &
1444  unsigned SAttrRetain =
1445  (SAttr &
1447  bool CStrong = (CAttrRetain != 0);
1448  bool SStrong = (SAttrRetain != 0);
1449  if (CStrong != SStrong)
1450  Diag(Property->getLocation(), diag::warn_property_attribute)
1451  << Property->getDeclName() << "retain (or strong)" << inheritedName;
1452  }
1453  }
1454 
1455  // Check for nonatomic; note that nonatomic is effectively
1456  // meaningless for readonly properties, so don't diagnose if the
1457  // atomic property is 'readonly'.
1458  checkAtomicPropertyMismatch(*this, SuperProperty, Property, false);
1459  if (Property->getSetterName() != SuperProperty->getSetterName()) {
1460  Diag(Property->getLocation(), diag::warn_property_attribute)
1461  << Property->getDeclName() << "setter" << inheritedName;
1462  Diag(SuperProperty->getLocation(), diag::note_property_declare);
1463  }
1464  if (Property->getGetterName() != SuperProperty->getGetterName()) {
1465  Diag(Property->getLocation(), diag::warn_property_attribute)
1466  << Property->getDeclName() << "getter" << inheritedName;
1467  Diag(SuperProperty->getLocation(), diag::note_property_declare);
1468  }
1469 
1470  QualType LHSType =
1471  Context.getCanonicalType(SuperProperty->getType());
1472  QualType RHSType =
1473  Context.getCanonicalType(Property->getType());
1474 
1475  if (!Context.propertyTypesAreCompatible(LHSType, RHSType)) {
1476  // Do cases not handled in above.
1477  // FIXME. For future support of covariant property types, revisit this.
1478  bool IncompatibleObjC = false;
1479  QualType ConvertedType;
1480  if (!isObjCPointerConversion(RHSType, LHSType,
1481  ConvertedType, IncompatibleObjC) ||
1482  IncompatibleObjC) {
1483  Diag(Property->getLocation(), diag::warn_property_types_are_incompatible)
1484  << Property->getType() << SuperProperty->getType() << inheritedName;
1485  Diag(SuperProperty->getLocation(), diag::note_property_declare);
1486  }
1487  }
1488 }
1489 
1491  ObjCMethodDecl *GetterMethod,
1492  SourceLocation Loc) {
1493  if (!GetterMethod)
1494  return false;
1495  QualType GetterType = GetterMethod->getReturnType().getNonReferenceType();
1496  QualType PropertyRValueType =
1497  property->getType().getNonReferenceType().getAtomicUnqualifiedType();
1498  bool compat = Context.hasSameType(PropertyRValueType, GetterType);
1499  if (!compat) {
1500  const ObjCObjectPointerType *propertyObjCPtr = nullptr;
1501  const ObjCObjectPointerType *getterObjCPtr = nullptr;
1502  if ((propertyObjCPtr =
1503  PropertyRValueType->getAs<ObjCObjectPointerType>()) &&
1504  (getterObjCPtr = GetterType->getAs<ObjCObjectPointerType>()))
1505  compat = Context.canAssignObjCInterfaces(getterObjCPtr, propertyObjCPtr);
1506  else if (CheckAssignmentConstraints(Loc, GetterType, PropertyRValueType)
1507  != Compatible) {
1508  Diag(Loc, diag::error_property_accessor_type)
1509  << property->getDeclName() << PropertyRValueType
1510  << GetterMethod->getSelector() << GetterType;
1511  Diag(GetterMethod->getLocation(), diag::note_declared_at);
1512  return true;
1513  } else {
1514  compat = true;
1515  QualType lhsType = Context.getCanonicalType(PropertyRValueType);
1516  QualType rhsType =Context.getCanonicalType(GetterType).getUnqualifiedType();
1517  if (lhsType != rhsType && lhsType->isArithmeticType())
1518  compat = false;
1519  }
1520  }
1521 
1522  if (!compat) {
1523  Diag(Loc, diag::warn_accessor_property_type_mismatch)
1524  << property->getDeclName()
1525  << GetterMethod->getSelector();
1526  Diag(GetterMethod->getLocation(), diag::note_declared_at);
1527  return true;
1528  }
1529 
1530  return false;
1531 }
1532 
1533 /// CollectImmediateProperties - This routine collects all properties in
1534 /// the class and its conforming protocols; but not those in its super class.
1535 static void
1538  ObjCContainerDecl::PropertyMap &SuperPropMap,
1539  bool CollectClassPropsOnly = false,
1540  bool IncludeProtocols = true) {
1541  if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl)) {
1542  for (auto *Prop : IDecl->properties()) {
1543  if (CollectClassPropsOnly && !Prop->isClassProperty())
1544  continue;
1545  PropMap[std::make_pair(Prop->getIdentifier(), Prop->isClassProperty())] =
1546  Prop;
1547  }
1548 
1549  // Collect the properties from visible extensions.
1550  for (auto *Ext : IDecl->visible_extensions())
1551  CollectImmediateProperties(Ext, PropMap, SuperPropMap,
1552  CollectClassPropsOnly, IncludeProtocols);
1553 
1554  if (IncludeProtocols) {
1555  // Scan through class's protocols.
1556  for (auto *PI : IDecl->all_referenced_protocols())
1557  CollectImmediateProperties(PI, PropMap, SuperPropMap,
1558  CollectClassPropsOnly);
1559  }
1560  }
1561  if (ObjCCategoryDecl *CATDecl = dyn_cast<ObjCCategoryDecl>(CDecl)) {
1562  for (auto *Prop : CATDecl->properties()) {
1563  if (CollectClassPropsOnly && !Prop->isClassProperty())
1564  continue;
1565  PropMap[std::make_pair(Prop->getIdentifier(), Prop->isClassProperty())] =
1566  Prop;
1567  }
1568  if (IncludeProtocols) {
1569  // Scan through class's protocols.
1570  for (auto *PI : CATDecl->protocols())
1571  CollectImmediateProperties(PI, PropMap, SuperPropMap,
1572  CollectClassPropsOnly);
1573  }
1574  }
1575  else if (ObjCProtocolDecl *PDecl = dyn_cast<ObjCProtocolDecl>(CDecl)) {
1576  for (auto *Prop : PDecl->properties()) {
1577  if (CollectClassPropsOnly && !Prop->isClassProperty())
1578  continue;
1579  ObjCPropertyDecl *PropertyFromSuper =
1580  SuperPropMap[std::make_pair(Prop->getIdentifier(),
1581  Prop->isClassProperty())];
1582  // Exclude property for protocols which conform to class's super-class,
1583  // as super-class has to implement the property.
1584  if (!PropertyFromSuper ||
1585  PropertyFromSuper->getIdentifier() != Prop->getIdentifier()) {
1586  ObjCPropertyDecl *&PropEntry =
1587  PropMap[std::make_pair(Prop->getIdentifier(),
1588  Prop->isClassProperty())];
1589  if (!PropEntry)
1590  PropEntry = Prop;
1591  }
1592  }
1593  // Scan through protocol's protocols.
1594  for (auto *PI : PDecl->protocols())
1595  CollectImmediateProperties(PI, PropMap, SuperPropMap,
1596  CollectClassPropsOnly);
1597  }
1598 }
1599 
1600 /// CollectSuperClassPropertyImplementations - This routine collects list of
1601 /// properties to be implemented in super class(s) and also coming from their
1602 /// conforming protocols.
1604  ObjCInterfaceDecl::PropertyMap &PropMap) {
1605  if (ObjCInterfaceDecl *SDecl = CDecl->getSuperClass()) {
1607  while (SDecl) {
1608  SDecl->collectPropertiesToImplement(PropMap, PO);
1609  SDecl = SDecl->getSuperClass();
1610  }
1611  }
1612 }
1613 
1614 /// IvarBacksCurrentMethodAccessor - This routine returns 'true' if 'IV' is
1615 /// an ivar synthesized for 'Method' and 'Method' is a property accessor
1616 /// declared in class 'IFace'.
1617 bool
1619  ObjCMethodDecl *Method, ObjCIvarDecl *IV) {
1620  if (!IV->getSynthesize())
1621  return false;
1622  ObjCMethodDecl *IMD = IFace->lookupMethod(Method->getSelector(),
1623  Method->isInstanceMethod());
1624  if (!IMD || !IMD->isPropertyAccessor())
1625  return false;
1626 
1627  // look up a property declaration whose one of its accessors is implemented
1628  // by this method.
1629  for (const auto *Property : IFace->instance_properties()) {
1630  if ((Property->getGetterName() == IMD->getSelector() ||
1631  Property->getSetterName() == IMD->getSelector()) &&
1632  (Property->getPropertyIvarDecl() == IV))
1633  return true;
1634  }
1635  // Also look up property declaration in class extension whose one of its
1636  // accessors is implemented by this method.
1637  for (const auto *Ext : IFace->known_extensions())
1638  for (const auto *Property : Ext->instance_properties())
1639  if ((Property->getGetterName() == IMD->getSelector() ||
1640  Property->getSetterName() == IMD->getSelector()) &&
1641  (Property->getPropertyIvarDecl() == IV))
1642  return true;
1643  return false;
1644 }
1645 
1647  ObjCPropertyDecl *Prop) {
1648  bool SuperClassImplementsGetter = false;
1649  bool SuperClassImplementsSetter = false;
1651  SuperClassImplementsSetter = true;
1652 
1653  while (IDecl->getSuperClass()) {
1654  ObjCInterfaceDecl *SDecl = IDecl->getSuperClass();
1655  if (!SuperClassImplementsGetter && SDecl->getInstanceMethod(Prop->getGetterName()))
1656  SuperClassImplementsGetter = true;
1657 
1658  if (!SuperClassImplementsSetter && SDecl->getInstanceMethod(Prop->getSetterName()))
1659  SuperClassImplementsSetter = true;
1660  if (SuperClassImplementsGetter && SuperClassImplementsSetter)
1661  return true;
1662  IDecl = IDecl->getSuperClass();
1663  }
1664  return false;
1665 }
1666 
1667 /// \brief Default synthesizes all properties which must be synthesized
1668 /// in class's \@implementation.
1670  ObjCInterfaceDecl *IDecl) {
1673  IDecl->collectPropertiesToImplement(PropMap, PropertyOrder);
1674  if (PropMap.empty())
1675  return;
1676  ObjCInterfaceDecl::PropertyMap SuperPropMap;
1677  CollectSuperClassPropertyImplementations(IDecl, SuperPropMap);
1678 
1679  for (unsigned i = 0, e = PropertyOrder.size(); i != e; i++) {
1680  ObjCPropertyDecl *Prop = PropertyOrder[i];
1681  // Is there a matching property synthesize/dynamic?
1682  if (Prop->isInvalidDecl() ||
1683  Prop->isClassProperty() ||
1685  continue;
1686  // Property may have been synthesized by user.
1687  if (IMPDecl->FindPropertyImplDecl(
1688  Prop->getIdentifier(), Prop->getQueryKind()))
1689  continue;
1690  if (IMPDecl->getInstanceMethod(Prop->getGetterName())) {
1692  continue;
1693  if (IMPDecl->getInstanceMethod(Prop->getSetterName()))
1694  continue;
1695  }
1696  if (ObjCPropertyImplDecl *PID =
1697  IMPDecl->FindPropertyImplIvarDecl(Prop->getIdentifier())) {
1698  Diag(Prop->getLocation(), diag::warn_no_autosynthesis_shared_ivar_property)
1699  << Prop->getIdentifier();
1700  if (PID->getLocation().isValid())
1701  Diag(PID->getLocation(), diag::note_property_synthesize);
1702  continue;
1703  }
1704  ObjCPropertyDecl *PropInSuperClass =
1705  SuperPropMap[std::make_pair(Prop->getIdentifier(),
1706  Prop->isClassProperty())];
1707  if (ObjCProtocolDecl *Proto =
1708  dyn_cast<ObjCProtocolDecl>(Prop->getDeclContext())) {
1709  // We won't auto-synthesize properties declared in protocols.
1710  // Suppress the warning if class's superclass implements property's
1711  // getter and implements property's setter (if readwrite property).
1712  // Or, if property is going to be implemented in its super class.
1713  if (!SuperClassImplementsProperty(IDecl, Prop) && !PropInSuperClass) {
1714  Diag(IMPDecl->getLocation(),
1715  diag::warn_auto_synthesizing_protocol_property)
1716  << Prop << Proto;
1717  Diag(Prop->getLocation(), diag::note_property_declare);
1718  }
1719  continue;
1720  }
1721  // If property to be implemented in the super class, ignore.
1722  if (PropInSuperClass) {
1724  (PropInSuperClass->getPropertyAttributes() &
1726  !IMPDecl->getInstanceMethod(Prop->getSetterName()) &&
1727  !IDecl->HasUserDeclaredSetterMethod(Prop)) {
1728  Diag(Prop->getLocation(), diag::warn_no_autosynthesis_property)
1729  << Prop->getIdentifier();
1730  Diag(PropInSuperClass->getLocation(), diag::note_property_declare);
1731  }
1732  else {
1733  Diag(Prop->getLocation(), diag::warn_autosynthesis_property_in_superclass)
1734  << Prop->getIdentifier();
1735  Diag(PropInSuperClass->getLocation(), diag::note_property_declare);
1736  Diag(IMPDecl->getLocation(), diag::note_while_in_implementation);
1737  }
1738  continue;
1739  }
1740  // We use invalid SourceLocations for the synthesized ivars since they
1741  // aren't really synthesized at a particular location; they just exist.
1742  // Saying that they are located at the @implementation isn't really going
1743  // to help users.
1744  ObjCPropertyImplDecl *PIDecl = dyn_cast_or_null<ObjCPropertyImplDecl>(
1746  true,
1747  /* property = */ Prop->getIdentifier(),
1748  /* ivar = */ Prop->getDefaultSynthIvarName(Context),
1749  Prop->getLocation(), Prop->getQueryKind()));
1750  if (PIDecl) {
1751  Diag(Prop->getLocation(), diag::warn_missing_explicit_synthesis);
1752  Diag(IMPDecl->getLocation(), diag::note_while_in_implementation);
1753  }
1754  }
1755 }
1756 
1758  if (!LangOpts.ObjCDefaultSynthProperties || LangOpts.ObjCRuntime.isFragile())
1759  return;
1760  ObjCImplementationDecl *IC=dyn_cast_or_null<ObjCImplementationDecl>(D);
1761  if (!IC)
1762  return;
1763  if (ObjCInterfaceDecl* IDecl = IC->getClassInterface())
1764  if (!IDecl->isObjCRequiresPropertyDefs())
1765  DefaultSynthesizeProperties(S, IC, IDecl);
1766 }
1767 
1769  Sema &S, ObjCInterfaceDecl *PrimaryClass, Selector Method,
1770  ObjCImplDecl *IMPDecl, ObjCContainerDecl *CDecl, ObjCCategoryDecl *C,
1771  ObjCPropertyDecl *Prop,
1772  llvm::SmallPtrSet<const ObjCMethodDecl *, 8> &SMap) {
1773  // Check to see if we have a corresponding selector in SMap and with the
1774  // right method type.
1775  auto I = std::find_if(SMap.begin(), SMap.end(),
1776  [&](const ObjCMethodDecl *x) {
1777  return x->getSelector() == Method &&
1778  x->isClassMethod() == Prop->isClassProperty();
1779  });
1780  // When reporting on missing property setter/getter implementation in
1781  // categories, do not report when they are declared in primary class,
1782  // class's protocol, or one of it super classes. This is because,
1783  // the class is going to implement them.
1784  if (I == SMap.end() &&
1785  (PrimaryClass == nullptr ||
1786  !PrimaryClass->lookupPropertyAccessor(Method, C,
1787  Prop->isClassProperty()))) {
1788  unsigned diag =
1789  isa<ObjCCategoryDecl>(CDecl)
1790  ? (Prop->isClassProperty()
1791  ? diag::warn_impl_required_in_category_for_class_property
1792  : diag::warn_setter_getter_impl_required_in_category)
1793  : (Prop->isClassProperty()
1794  ? diag::warn_impl_required_for_class_property
1795  : diag::warn_setter_getter_impl_required);
1796  S.Diag(IMPDecl->getLocation(), diag) << Prop->getDeclName() << Method;
1797  S.Diag(Prop->getLocation(), diag::note_property_declare);
1798  if (S.LangOpts.ObjCDefaultSynthProperties &&
1800  if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CDecl))
1801  if (const ObjCInterfaceDecl *RID = ID->isObjCRequiresPropertyDefs())
1802  S.Diag(RID->getLocation(), diag::note_suppressed_class_declare);
1803  }
1804 }
1805 
1807  ObjCContainerDecl *CDecl,
1808  bool SynthesizeProperties) {
1810  ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl);
1811 
1812  // Since we don't synthesize class properties, we should emit diagnose even
1813  // if SynthesizeProperties is true.
1814  ObjCContainerDecl::PropertyMap NoNeedToImplPropMap;
1815  // Gather properties which need not be implemented in this class
1816  // or category.
1817  if (!IDecl)
1818  if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) {
1819  // For categories, no need to implement properties declared in
1820  // its primary class (and its super classes) if property is
1821  // declared in one of those containers.
1822  if ((IDecl = C->getClassInterface())) {
1824  IDecl->collectPropertiesToImplement(NoNeedToImplPropMap, PO);
1825  }
1826  }
1827  if (IDecl)
1828  CollectSuperClassPropertyImplementations(IDecl, NoNeedToImplPropMap);
1829 
1830  // When SynthesizeProperties is true, we only check class properties.
1831  CollectImmediateProperties(CDecl, PropMap, NoNeedToImplPropMap,
1832  SynthesizeProperties/*CollectClassPropsOnly*/);
1833 
1834  // Scan the @interface to see if any of the protocols it adopts
1835  // require an explicit implementation, via attribute
1836  // 'objc_protocol_requires_explicit_implementation'.
1837  if (IDecl) {
1838  std::unique_ptr<ObjCContainerDecl::PropertyMap> LazyMap;
1839 
1840  for (auto *PDecl : IDecl->all_referenced_protocols()) {
1841  if (!PDecl->hasAttr<ObjCExplicitProtocolImplAttr>())
1842  continue;
1843  // Lazily construct a set of all the properties in the @interface
1844  // of the class, without looking at the superclass. We cannot
1845  // use the call to CollectImmediateProperties() above as that
1846  // utilizes information from the super class's properties as well
1847  // as scans the adopted protocols. This work only triggers for protocols
1848  // with the attribute, which is very rare, and only occurs when
1849  // analyzing the @implementation.
1850  if (!LazyMap) {
1851  ObjCContainerDecl::PropertyMap NoNeedToImplPropMap;
1852  LazyMap.reset(new ObjCContainerDecl::PropertyMap());
1853  CollectImmediateProperties(CDecl, *LazyMap, NoNeedToImplPropMap,
1854  /* CollectClassPropsOnly */ false,
1855  /* IncludeProtocols */ false);
1856  }
1857  // Add the properties of 'PDecl' to the list of properties that
1858  // need to be implemented.
1859  for (auto *PropDecl : PDecl->properties()) {
1860  if ((*LazyMap)[std::make_pair(PropDecl->getIdentifier(),
1861  PropDecl->isClassProperty())])
1862  continue;
1863  PropMap[std::make_pair(PropDecl->getIdentifier(),
1864  PropDecl->isClassProperty())] = PropDecl;
1865  }
1866  }
1867  }
1868 
1869  if (PropMap.empty())
1870  return;
1871 
1873  for (const auto *I : IMPDecl->property_impls())
1874  PropImplMap.insert(I->getPropertyDecl());
1875 
1876  llvm::SmallPtrSet<const ObjCMethodDecl *, 8> InsMap;
1877  // Collect property accessors implemented in current implementation.
1878  for (const auto *I : IMPDecl->methods())
1879  InsMap.insert(I);
1880 
1881  ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl);
1882  ObjCInterfaceDecl *PrimaryClass = nullptr;
1883  if (C && !C->IsClassExtension())
1884  if ((PrimaryClass = C->getClassInterface()))
1885  // Report unimplemented properties in the category as well.
1886  if (ObjCImplDecl *IMP = PrimaryClass->getImplementation()) {
1887  // When reporting on missing setter/getters, do not report when
1888  // setter/getter is implemented in category's primary class
1889  // implementation.
1890  for (const auto *I : IMP->methods())
1891  InsMap.insert(I);
1892  }
1893 
1894  for (ObjCContainerDecl::PropertyMap::iterator
1895  P = PropMap.begin(), E = PropMap.end(); P != E; ++P) {
1896  ObjCPropertyDecl *Prop = P->second;
1897  // Is there a matching property synthesize/dynamic?
1898  if (Prop->isInvalidDecl() ||
1900  PropImplMap.count(Prop) ||
1901  Prop->getAvailability() == AR_Unavailable)
1902  continue;
1903 
1904  // Diagnose unimplemented getters and setters.
1906  PrimaryClass, Prop->getGetterName(), IMPDecl, CDecl, C, Prop, InsMap);
1907  if (!Prop->isReadOnly())
1909  PrimaryClass, Prop->getSetterName(),
1910  IMPDecl, CDecl, C, Prop, InsMap);
1911  }
1912 }
1913 
1915  for (const auto *propertyImpl : impDecl->property_impls()) {
1916  const auto *property = propertyImpl->getPropertyDecl();
1917 
1918  // Warn about null_resettable properties with synthesized setters,
1919  // because the setter won't properly handle nil.
1920  if (propertyImpl->getPropertyImplementation()
1922  (property->getPropertyAttributes() &
1924  property->getGetterMethodDecl() &&
1925  property->getSetterMethodDecl()) {
1926  auto *getterMethod = property->getGetterMethodDecl();
1927  auto *setterMethod = property->getSetterMethodDecl();
1928  if (!impDecl->getInstanceMethod(setterMethod->getSelector()) &&
1929  !impDecl->getInstanceMethod(getterMethod->getSelector())) {
1930  SourceLocation loc = propertyImpl->getLocation();
1931  if (loc.isInvalid())
1932  loc = impDecl->getLocStart();
1933 
1934  Diag(loc, diag::warn_null_resettable_setter)
1935  << setterMethod->getSelector() << property->getDeclName();
1936  }
1937  }
1938  }
1939 }
1940 
1941 void
1943  ObjCInterfaceDecl* IDecl) {
1944  // Rules apply in non-GC mode only
1945  if (getLangOpts().getGC() != LangOptions::NonGC)
1946  return;
1948  for (auto *Prop : IDecl->properties())
1949  PM[std::make_pair(Prop->getIdentifier(), Prop->isClassProperty())] = Prop;
1950  for (const auto *Ext : IDecl->known_extensions())
1951  for (auto *Prop : Ext->properties())
1952  PM[std::make_pair(Prop->getIdentifier(), Prop->isClassProperty())] = Prop;
1953 
1954  for (ObjCContainerDecl::PropertyMap::iterator I = PM.begin(), E = PM.end();
1955  I != E; ++I) {
1956  const ObjCPropertyDecl *Property = I->second;
1957  ObjCMethodDecl *GetterMethod = nullptr;
1958  ObjCMethodDecl *SetterMethod = nullptr;
1959  bool LookedUpGetterSetter = false;
1960 
1961  unsigned Attributes = Property->getPropertyAttributes();
1962  unsigned AttributesAsWritten = Property->getPropertyAttributesAsWritten();
1963 
1964  if (!(AttributesAsWritten & ObjCPropertyDecl::OBJC_PR_atomic) &&
1965  !(AttributesAsWritten & ObjCPropertyDecl::OBJC_PR_nonatomic)) {
1966  GetterMethod = Property->isClassProperty() ?
1967  IMPDecl->getClassMethod(Property->getGetterName()) :
1968  IMPDecl->getInstanceMethod(Property->getGetterName());
1969  SetterMethod = Property->isClassProperty() ?
1970  IMPDecl->getClassMethod(Property->getSetterName()) :
1971  IMPDecl->getInstanceMethod(Property->getSetterName());
1972  LookedUpGetterSetter = true;
1973  if (GetterMethod) {
1974  Diag(GetterMethod->getLocation(),
1975  diag::warn_default_atomic_custom_getter_setter)
1976  << Property->getIdentifier() << 0;
1977  Diag(Property->getLocation(), diag::note_property_declare);
1978  }
1979  if (SetterMethod) {
1980  Diag(SetterMethod->getLocation(),
1981  diag::warn_default_atomic_custom_getter_setter)
1982  << Property->getIdentifier() << 1;
1983  Diag(Property->getLocation(), diag::note_property_declare);
1984  }
1985  }
1986 
1987  // We only care about readwrite atomic property.
1988  if ((Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) ||
1989  !(Attributes & ObjCPropertyDecl::OBJC_PR_readwrite))
1990  continue;
1991  if (const ObjCPropertyImplDecl *PIDecl = IMPDecl->FindPropertyImplDecl(
1992  Property->getIdentifier(), Property->getQueryKind())) {
1993  if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
1994  continue;
1995  if (!LookedUpGetterSetter) {
1996  GetterMethod = Property->isClassProperty() ?
1997  IMPDecl->getClassMethod(Property->getGetterName()) :
1998  IMPDecl->getInstanceMethod(Property->getGetterName());
1999  SetterMethod = Property->isClassProperty() ?
2000  IMPDecl->getClassMethod(Property->getSetterName()) :
2001  IMPDecl->getInstanceMethod(Property->getSetterName());
2002  }
2003  if ((GetterMethod && !SetterMethod) || (!GetterMethod && SetterMethod)) {
2004  SourceLocation MethodLoc =
2005  (GetterMethod ? GetterMethod->getLocation()
2006  : SetterMethod->getLocation());
2007  Diag(MethodLoc, diag::warn_atomic_property_rule)
2008  << Property->getIdentifier() << (GetterMethod != nullptr)
2009  << (SetterMethod != nullptr);
2010  // fixit stuff.
2011  if (Property->getLParenLoc().isValid() &&
2012  !(AttributesAsWritten & ObjCPropertyDecl::OBJC_PR_atomic)) {
2013  // @property () ... case.
2014  SourceLocation AfterLParen =
2015  getLocForEndOfToken(Property->getLParenLoc());
2016  StringRef NonatomicStr = AttributesAsWritten? "nonatomic, "
2017  : "nonatomic";
2018  Diag(Property->getLocation(),
2019  diag::note_atomic_property_fixup_suggest)
2020  << FixItHint::CreateInsertion(AfterLParen, NonatomicStr);
2021  } else if (Property->getLParenLoc().isInvalid()) {
2022  //@property id etc.
2023  SourceLocation startLoc =
2024  Property->getTypeSourceInfo()->getTypeLoc().getBeginLoc();
2025  Diag(Property->getLocation(),
2026  diag::note_atomic_property_fixup_suggest)
2027  << FixItHint::CreateInsertion(startLoc, "(nonatomic) ");
2028  }
2029  else
2030  Diag(MethodLoc, diag::note_atomic_property_fixup_suggest);
2031  Diag(Property->getLocation(), diag::note_property_declare);
2032  }
2033  }
2034  }
2035 }
2036 
2038  if (getLangOpts().getGC() == LangOptions::GCOnly)
2039  return;
2040 
2041  for (const auto *PID : D->property_impls()) {
2042  const ObjCPropertyDecl *PD = PID->getPropertyDecl();
2043  if (PD && !PD->hasAttr<NSReturnsNotRetainedAttr>() &&
2044  !PD->isClassProperty() &&
2045  !D->getInstanceMethod(PD->getGetterName())) {
2046  ObjCMethodDecl *method = PD->getGetterMethodDecl();
2047  if (!method)
2048  continue;
2049  ObjCMethodFamily family = method->getMethodFamily();
2050  if (family == OMF_alloc || family == OMF_copy ||
2051  family == OMF_mutableCopy || family == OMF_new) {
2052  if (getLangOpts().ObjCAutoRefCount)
2053  Diag(PD->getLocation(), diag::err_cocoa_naming_owned_rule);
2054  else
2055  Diag(PD->getLocation(), diag::warn_cocoa_naming_owned_rule);
2056 
2057  // Look for a getter explicitly declared alongside the property.
2058  // If we find one, use its location for the note.
2059  SourceLocation noteLoc = PD->getLocation();
2060  SourceLocation fixItLoc;
2061  for (auto *getterRedecl : method->redecls()) {
2062  if (getterRedecl->isImplicit())
2063  continue;
2064  if (getterRedecl->getDeclContext() != PD->getDeclContext())
2065  continue;
2066  noteLoc = getterRedecl->getLocation();
2067  fixItLoc = getterRedecl->getLocEnd();
2068  }
2069 
2071  TokenValue tokens[] = {
2072  tok::kw___attribute, tok::l_paren, tok::l_paren,
2073  PP.getIdentifierInfo("objc_method_family"), tok::l_paren,
2074  PP.getIdentifierInfo("none"), tok::r_paren,
2075  tok::r_paren, tok::r_paren
2076  };
2077  StringRef spelling = "__attribute__((objc_method_family(none)))";
2078  StringRef macroName = PP.getLastMacroWithSpelling(noteLoc, tokens);
2079  if (!macroName.empty())
2080  spelling = macroName;
2081 
2082  auto noteDiag = Diag(noteLoc, diag::note_cocoa_naming_declare_family)
2083  << method->getDeclName() << spelling;
2084  if (fixItLoc.isValid()) {
2085  SmallString<64> fixItText(" ");
2086  fixItText += spelling;
2087  noteDiag << FixItHint::CreateInsertion(fixItLoc, fixItText);
2088  }
2089  }
2090  }
2091  }
2092 }
2093 
2095  const ObjCImplementationDecl *ImplD,
2096  const ObjCInterfaceDecl *IFD) {
2097  assert(IFD->hasDesignatedInitializers());
2098  const ObjCInterfaceDecl *SuperD = IFD->getSuperClass();
2099  if (!SuperD)
2100  return;
2101 
2102  SelectorSet InitSelSet;
2103  for (const auto *I : ImplD->instance_methods())
2104  if (I->getMethodFamily() == OMF_init)
2105  InitSelSet.insert(I->getSelector());
2106 
2108  SuperD->getDesignatedInitializers(DesignatedInits);
2110  I = DesignatedInits.begin(), E = DesignatedInits.end(); I != E; ++I) {
2111  const ObjCMethodDecl *MD = *I;
2112  if (!InitSelSet.count(MD->getSelector())) {
2113  bool Ignore = false;
2114  if (auto *IMD = IFD->getInstanceMethod(MD->getSelector())) {
2115  Ignore = IMD->isUnavailable();
2116  }
2117  if (!Ignore) {
2118  Diag(ImplD->getLocation(),
2119  diag::warn_objc_implementation_missing_designated_init_override)
2120  << MD->getSelector();
2121  Diag(MD->getLocation(), diag::note_objc_designated_init_marked_here);
2122  }
2123  }
2124  }
2125 }
2126 
2127 /// AddPropertyAttrs - Propagates attributes from a property to the
2128 /// implicitly-declared getter or setter for that property.
2129 static void AddPropertyAttrs(Sema &S, ObjCMethodDecl *PropertyMethod,
2131  // Should we just clone all attributes over?
2132  for (const auto *A : Property->attrs()) {
2133  if (isa<DeprecatedAttr>(A) ||
2134  isa<UnavailableAttr>(A) ||
2135  isa<AvailabilityAttr>(A))
2136  PropertyMethod->addAttr(A->clone(S.Context));
2137  }
2138 }
2139 
2140 /// ProcessPropertyDecl - Make sure that any user-defined setter/getter methods
2141 /// have the property type and issue diagnostics if they don't.
2142 /// Also synthesize a getter/setter method if none exist (and update the
2143 /// appropriate lookup tables.
2145  ObjCMethodDecl *GetterMethod, *SetterMethod;
2146  ObjCContainerDecl *CD = cast<ObjCContainerDecl>(property->getDeclContext());
2147  if (CD->isInvalidDecl())
2148  return;
2149 
2150  bool IsClassProperty = property->isClassProperty();
2151  GetterMethod = IsClassProperty ?
2152  CD->getClassMethod(property->getGetterName()) :
2153  CD->getInstanceMethod(property->getGetterName());
2154 
2155  // if setter or getter is not found in class extension, it might be
2156  // in the primary class.
2157  if (!GetterMethod)
2158  if (const ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CD))
2159  if (CatDecl->IsClassExtension())
2160  GetterMethod = IsClassProperty ? CatDecl->getClassInterface()->
2161  getClassMethod(property->getGetterName()) :
2162  CatDecl->getClassInterface()->
2163  getInstanceMethod(property->getGetterName());
2164 
2165  SetterMethod = IsClassProperty ?
2166  CD->getClassMethod(property->getSetterName()) :
2167  CD->getInstanceMethod(property->getSetterName());
2168  if (!SetterMethod)
2169  if (const ObjCCategoryDecl *CatDecl = dyn_cast<ObjCCategoryDecl>(CD))
2170  if (CatDecl->IsClassExtension())
2171  SetterMethod = IsClassProperty ? CatDecl->getClassInterface()->
2172  getClassMethod(property->getSetterName()) :
2173  CatDecl->getClassInterface()->
2174  getInstanceMethod(property->getSetterName());
2175  DiagnosePropertyAccessorMismatch(property, GetterMethod,
2176  property->getLocation());
2177 
2178  if (SetterMethod) {
2180  property->getPropertyAttributes();
2181  if ((!(CAttr & ObjCPropertyDecl::OBJC_PR_readonly)) &&
2182  Context.getCanonicalType(SetterMethod->getReturnType()) !=
2183  Context.VoidTy)
2184  Diag(SetterMethod->getLocation(), diag::err_setter_type_void);
2185  if (SetterMethod->param_size() != 1 ||
2187  (*SetterMethod->param_begin())->getType().getNonReferenceType(),
2188  property->getType().getNonReferenceType())) {
2189  Diag(property->getLocation(),
2190  diag::warn_accessor_property_type_mismatch)
2191  << property->getDeclName()
2192  << SetterMethod->getSelector();
2193  Diag(SetterMethod->getLocation(), diag::note_declared_at);
2194  }
2195  }
2196 
2197  // Synthesize getter/setter methods if none exist.
2198  // Find the default getter and if one not found, add one.
2199  // FIXME: The synthesized property we set here is misleading. We almost always
2200  // synthesize these methods unless the user explicitly provided prototypes
2201  // (which is odd, but allowed). Sema should be typechecking that the
2202  // declarations jive in that situation (which it is not currently).
2203  if (!GetterMethod) {
2204  // No instance/class method of same name as property getter name was found.
2205  // Declare a getter method and add it to the list of methods
2206  // for this class.
2207  SourceLocation Loc = property->getLocation();
2208 
2209  // The getter returns the declared property type with all qualifiers
2210  // removed.
2211  QualType resultTy = property->getType().getAtomicUnqualifiedType();
2212 
2213  // If the property is null_resettable, the getter returns nonnull.
2214  if (property->getPropertyAttributes() &
2216  QualType modifiedTy = resultTy;
2217  if (auto nullability = AttributedType::stripOuterNullability(modifiedTy)) {
2218  if (*nullability == NullabilityKind::Unspecified)
2220  modifiedTy, modifiedTy);
2221  }
2222  }
2223 
2224  GetterMethod = ObjCMethodDecl::Create(Context, Loc, Loc,
2225  property->getGetterName(),
2226  resultTy, nullptr, CD,
2227  !IsClassProperty, /*isVariadic=*/false,
2228  /*isPropertyAccessor=*/true,
2229  /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
2230  (property->getPropertyImplementation() ==
2234  CD->addDecl(GetterMethod);
2235 
2236  AddPropertyAttrs(*this, GetterMethod, property);
2237 
2238  if (property->hasAttr<NSReturnsNotRetainedAttr>())
2239  GetterMethod->addAttr(NSReturnsNotRetainedAttr::CreateImplicit(Context,
2240  Loc));
2241 
2242  if (property->hasAttr<ObjCReturnsInnerPointerAttr>())
2243  GetterMethod->addAttr(
2244  ObjCReturnsInnerPointerAttr::CreateImplicit(Context, Loc));
2245 
2246  if (const SectionAttr *SA = property->getAttr<SectionAttr>())
2247  GetterMethod->addAttr(
2248  SectionAttr::CreateImplicit(Context, SectionAttr::GNU_section,
2249  SA->getName(), Loc));
2250 
2251  if (getLangOpts().ObjCAutoRefCount)
2252  CheckARCMethodDecl(GetterMethod);
2253  } else
2254  // A user declared getter will be synthesize when @synthesize of
2255  // the property with the same name is seen in the @implementation
2256  GetterMethod->setPropertyAccessor(true);
2257  property->setGetterMethodDecl(GetterMethod);
2258 
2259  // Skip setter if property is read-only.
2260  if (!property->isReadOnly()) {
2261  // Find the default setter and if one not found, add one.
2262  if (!SetterMethod) {
2263  // No instance/class method of same name as property setter name was
2264  // found.
2265  // Declare a setter method and add it to the list of methods
2266  // for this class.
2267  SourceLocation Loc = property->getLocation();
2268 
2269  SetterMethod =
2270  ObjCMethodDecl::Create(Context, Loc, Loc,
2271  property->getSetterName(), Context.VoidTy,
2272  nullptr, CD, !IsClassProperty,
2273  /*isVariadic=*/false,
2274  /*isPropertyAccessor=*/true,
2275  /*isImplicitlyDeclared=*/true,
2276  /*isDefined=*/false,
2277  (property->getPropertyImplementation() ==
2281 
2282  // Remove all qualifiers from the setter's parameter type.
2283  QualType paramTy =
2284  property->getType().getUnqualifiedType().getAtomicUnqualifiedType();
2285 
2286  // If the property is null_resettable, the setter accepts a
2287  // nullable value.
2288  if (property->getPropertyAttributes() &
2290  QualType modifiedTy = paramTy;
2291  if (auto nullability = AttributedType::stripOuterNullability(modifiedTy)){
2292  if (*nullability == NullabilityKind::Unspecified)
2294  modifiedTy, modifiedTy);
2295  }
2296  }
2297 
2298  // Invent the arguments for the setter. We don't bother making a
2299  // nice name for the argument.
2300  ParmVarDecl *Argument = ParmVarDecl::Create(Context, SetterMethod,
2301  Loc, Loc,
2302  property->getIdentifier(),
2303  paramTy,
2304  /*TInfo=*/nullptr,
2305  SC_None,
2306  nullptr);
2307  SetterMethod->setMethodParams(Context, Argument, None);
2308 
2309  AddPropertyAttrs(*this, SetterMethod, property);
2310 
2311  CD->addDecl(SetterMethod);
2312  if (const SectionAttr *SA = property->getAttr<SectionAttr>())
2313  SetterMethod->addAttr(
2314  SectionAttr::CreateImplicit(Context, SectionAttr::GNU_section,
2315  SA->getName(), Loc));
2316  // It's possible for the user to have set a very odd custom
2317  // setter selector that causes it to have a method family.
2318  if (getLangOpts().ObjCAutoRefCount)
2319  CheckARCMethodDecl(SetterMethod);
2320  } else
2321  // A user declared setter will be synthesize when @synthesize of
2322  // the property with the same name is seen in the @implementation
2323  SetterMethod->setPropertyAccessor(true);
2324  property->setSetterMethodDecl(SetterMethod);
2325  }
2326  // Add any synthesized methods to the global pool. This allows us to
2327  // handle the following, which is supported by GCC (and part of the design).
2328  //
2329  // @interface Foo
2330  // @property double bar;
2331  // @end
2332  //
2333  // void thisIsUnfortunate() {
2334  // id foo;
2335  // double bar = [foo bar];
2336  // }
2337  //
2338  if (!IsClassProperty) {
2339  if (GetterMethod)
2340  AddInstanceMethodToGlobalPool(GetterMethod);
2341  if (SetterMethod)
2342  AddInstanceMethodToGlobalPool(SetterMethod);
2343  } else {
2344  if (GetterMethod)
2345  AddFactoryMethodToGlobalPool(GetterMethod);
2346  if (SetterMethod)
2347  AddFactoryMethodToGlobalPool(SetterMethod);
2348  }
2349 
2350  ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(CD);
2351  if (!CurrentClass) {
2352  if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(CD))
2353  CurrentClass = Cat->getClassInterface();
2354  else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(CD))
2355  CurrentClass = Impl->getClassInterface();
2356  }
2357  if (GetterMethod)
2358  CheckObjCMethodOverrides(GetterMethod, CurrentClass, Sema::RTC_Unknown);
2359  if (SetterMethod)
2360  CheckObjCMethodOverrides(SetterMethod, CurrentClass, Sema::RTC_Unknown);
2361 }
2362 
2364  SourceLocation Loc,
2365  unsigned &Attributes,
2366  bool propertyInPrimaryClass) {
2367  // FIXME: Improve the reported location.
2368  if (!PDecl || PDecl->isInvalidDecl())
2369  return;
2370 
2371  if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
2372  (Attributes & ObjCDeclSpec::DQ_PR_readwrite))
2373  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2374  << "readonly" << "readwrite";
2375 
2376  ObjCPropertyDecl *PropertyDecl = cast<ObjCPropertyDecl>(PDecl);
2377  QualType PropertyTy = PropertyDecl->getType();
2378 
2379  // Check for copy or retain on non-object types.
2380  if ((Attributes & (ObjCDeclSpec::DQ_PR_weak | ObjCDeclSpec::DQ_PR_copy |
2382  !PropertyTy->isObjCRetainableType() &&
2383  !PropertyDecl->hasAttr<ObjCNSObjectAttr>()) {
2384  Diag(Loc, diag::err_objc_property_requires_object)
2385  << (Attributes & ObjCDeclSpec::DQ_PR_weak ? "weak" :
2386  Attributes & ObjCDeclSpec::DQ_PR_copy ? "copy" : "retain (or strong)");
2389  PropertyDecl->setInvalidDecl();
2390  }
2391 
2392  // Check for more than one of { assign, copy, retain }.
2393  if (Attributes & ObjCDeclSpec::DQ_PR_assign) {
2394  if (Attributes & ObjCDeclSpec::DQ_PR_copy) {
2395  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2396  << "assign" << "copy";
2397  Attributes &= ~ObjCDeclSpec::DQ_PR_copy;
2398  }
2399  if (Attributes & ObjCDeclSpec::DQ_PR_retain) {
2400  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2401  << "assign" << "retain";
2402  Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
2403  }
2404  if (Attributes & ObjCDeclSpec::DQ_PR_strong) {
2405  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2406  << "assign" << "strong";
2407  Attributes &= ~ObjCDeclSpec::DQ_PR_strong;
2408  }
2409  if (getLangOpts().ObjCAutoRefCount &&
2410  (Attributes & ObjCDeclSpec::DQ_PR_weak)) {
2411  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2412  << "assign" << "weak";
2413  Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
2414  }
2415  if (PropertyDecl->hasAttr<IBOutletCollectionAttr>())
2416  Diag(Loc, diag::warn_iboutletcollection_property_assign);
2417  } else if (Attributes & ObjCDeclSpec::DQ_PR_unsafe_unretained) {
2418  if (Attributes & ObjCDeclSpec::DQ_PR_copy) {
2419  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2420  << "unsafe_unretained" << "copy";
2421  Attributes &= ~ObjCDeclSpec::DQ_PR_copy;
2422  }
2423  if (Attributes & ObjCDeclSpec::DQ_PR_retain) {
2424  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2425  << "unsafe_unretained" << "retain";
2426  Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
2427  }
2428  if (Attributes & ObjCDeclSpec::DQ_PR_strong) {
2429  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2430  << "unsafe_unretained" << "strong";
2431  Attributes &= ~ObjCDeclSpec::DQ_PR_strong;
2432  }
2433  if (getLangOpts().ObjCAutoRefCount &&
2434  (Attributes & ObjCDeclSpec::DQ_PR_weak)) {
2435  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2436  << "unsafe_unretained" << "weak";
2437  Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
2438  }
2439  } else if (Attributes & ObjCDeclSpec::DQ_PR_copy) {
2440  if (Attributes & ObjCDeclSpec::DQ_PR_retain) {
2441  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2442  << "copy" << "retain";
2443  Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
2444  }
2445  if (Attributes & ObjCDeclSpec::DQ_PR_strong) {
2446  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2447  << "copy" << "strong";
2448  Attributes &= ~ObjCDeclSpec::DQ_PR_strong;
2449  }
2450  if (Attributes & ObjCDeclSpec::DQ_PR_weak) {
2451  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2452  << "copy" << "weak";
2453  Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
2454  }
2455  }
2456  else if ((Attributes & ObjCDeclSpec::DQ_PR_retain) &&
2457  (Attributes & ObjCDeclSpec::DQ_PR_weak)) {
2458  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2459  << "retain" << "weak";
2460  Attributes &= ~ObjCDeclSpec::DQ_PR_retain;
2461  }
2462  else if ((Attributes & ObjCDeclSpec::DQ_PR_strong) &&
2463  (Attributes & ObjCDeclSpec::DQ_PR_weak)) {
2464  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2465  << "strong" << "weak";
2466  Attributes &= ~ObjCDeclSpec::DQ_PR_weak;
2467  }
2468 
2469  if (Attributes & ObjCDeclSpec::DQ_PR_weak) {
2470  // 'weak' and 'nonnull' are mutually exclusive.
2471  if (auto nullability = PropertyTy->getNullability(Context)) {
2472  if (*nullability == NullabilityKind::NonNull)
2473  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2474  << "nonnull" << "weak";
2475  }
2476  }
2477 
2478  if ((Attributes & ObjCDeclSpec::DQ_PR_atomic) &&
2479  (Attributes & ObjCDeclSpec::DQ_PR_nonatomic)) {
2480  Diag(Loc, diag::err_objc_property_attr_mutually_exclusive)
2481  << "atomic" << "nonatomic";
2482  Attributes &= ~ObjCDeclSpec::DQ_PR_atomic;
2483  }
2484 
2485  // Warn if user supplied no assignment attribute, property is
2486  // readwrite, and this is an object type.
2487  if (!getOwnershipRule(Attributes) && PropertyTy->isObjCRetainableType()) {
2488  if (Attributes & ObjCDeclSpec::DQ_PR_readonly) {
2489  // do nothing
2490  } else if (getLangOpts().ObjCAutoRefCount) {
2491  // With arc, @property definitions should default to strong when
2492  // not specified.
2494  } else if (PropertyTy->isObjCObjectPointerType()) {
2495  bool isAnyClassTy =
2496  (PropertyTy->isObjCClassType() ||
2497  PropertyTy->isObjCQualifiedClassType());
2498  // In non-gc, non-arc mode, 'Class' is treated as a 'void *' no need to
2499  // issue any warning.
2500  if (isAnyClassTy && getLangOpts().getGC() == LangOptions::NonGC)
2501  ;
2502  else if (propertyInPrimaryClass) {
2503  // Don't issue warning on property with no life time in class
2504  // extension as it is inherited from property in primary class.
2505  // Skip this warning in gc-only mode.
2506  if (getLangOpts().getGC() != LangOptions::GCOnly)
2507  Diag(Loc, diag::warn_objc_property_no_assignment_attribute);
2508 
2509  // If non-gc code warn that this is likely inappropriate.
2510  if (getLangOpts().getGC() == LangOptions::NonGC)
2511  Diag(Loc, diag::warn_objc_property_default_assign_on_object);
2512  }
2513  }
2514 
2515  // FIXME: Implement warning dependent on NSCopying being
2516  // implemented. See also:
2517  // <rdar://5168496&4855821&5607453&5096644&4947311&5698469&4947014&5168496>
2518  // (please trim this list while you are at it).
2519  }
2520 
2521  if (!(Attributes & ObjCDeclSpec::DQ_PR_copy)
2522  &&!(Attributes & ObjCDeclSpec::DQ_PR_readonly)
2523  && getLangOpts().getGC() == LangOptions::GCOnly
2524  && PropertyTy->isBlockPointerType())
2525  Diag(Loc, diag::warn_objc_property_copy_missing_on_block);
2526  else if ((Attributes & ObjCDeclSpec::DQ_PR_retain) &&
2527  !(Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
2528  !(Attributes & ObjCDeclSpec::DQ_PR_strong) &&
2529  PropertyTy->isBlockPointerType())
2530  Diag(Loc, diag::warn_objc_property_retain_of_block);
2531 
2532  if ((Attributes & ObjCDeclSpec::DQ_PR_readonly) &&
2533  (Attributes & ObjCDeclSpec::DQ_PR_setter))
2534  Diag(Loc, diag::warn_objc_readonly_property_has_setter);
2535 }
StringRef getLastMacroWithSpelling(SourceLocation Loc, ArrayRef< TokenValue > Tokens) const
Return the name of the macro defined before Loc that has spelling Tokens.
A call to an overloaded operator written using operator syntax.
Definition: ExprCXX.h:52
bool RequireNonAbstractType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1561
StringRef getName() const
getName - Get the name of identifier for this declaration as a StringRef.
Definition: Decl.h:237
protocol_range protocols() const
Definition: DeclObjC.h:2025
Lexer - This provides a simple interface that turns a text buffer into a stream of tokens...
Definition: Lexer.h:46
Smart pointer class that efficiently represents Objective-C method names.
A (possibly-)qualified type.
Definition: Type.h:599
bool isInvalid() const
Definition: Ownership.h:159
bool isMacroID() const
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.h:2214
const ObjCInterfaceDecl * isObjCRequiresPropertyDefs() const
isObjCRequiresPropertyDefs - Checks that a class or one of its super classes must not be auto-synthes...
Definition: DeclObjC.cpp:400
ObjCInterfaceDecl * getClassInterface()
Definition: DeclObjC.cpp:1071
bool IvarBacksCurrentMethodAccessor(ObjCInterfaceDecl *IFace, ObjCMethodDecl *Method, ObjCIvarDecl *IV)
IvarBacksCurrentMethodAccessor - This routine returns &#39;true&#39; if &#39;IV&#39; is an ivar synthesized for &#39;Meth...
IdentifierInfo * getIdentifier() const
getIdentifier - Get the identifier that names this declaration, if there is one.
Definition: Decl.h:232
bool isObjCPointerConversion(QualType FromType, QualType ToType, QualType &ConvertedType, bool &IncompatibleObjC)
isObjCPointerConversion - Determines whether this is an Objective-C pointer conversion.
PropertyControl getPropertyImplementation() const
Definition: DeclObjC.h:870
QualType getQualifiedType(SplitQualType split) const
Un-split a SplitQualType.
Definition: ASTContext.h:1740
const LangOptions & getLangOpts() const
Definition: Sema.h:1064
bool isClassProperty() const
Definition: DeclObjC.h:829
CanQual< T > getUnqualifiedType() const
Retrieve the unqualified form of this type.
llvm::DenseMap< std::pair< IdentifierInfo *, unsigned >, ObjCPropertyDecl * > PropertyMap
Definition: DeclObjC.h:1023
Decl * ActOnProperty(Scope *S, SourceLocation AtLoc, SourceLocation LParenLoc, FieldDeclarator &FD, ObjCDeclSpec &ODS, Selector GetterSel, Selector SetterSel, tok::ObjCKeywordKind MethodImplKind, DeclContext *lexicalDC=nullptr)
Defines the SourceManager interface.
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Definition: Preprocessor.h:944
void ActOnDocumentableDecl(Decl *D)
Should be called on all declarations that might have attached documentation comments.
Definition: SemaDecl.cpp:10906
void setObjCLifetime(ObjCLifetime type)
Definition: Type.h:312
static void CollectSuperClassPropertyImplementations(ObjCInterfaceDecl *CDecl, ObjCInterfaceDecl::PropertyMap &PropMap)
CollectSuperClassPropertyImplementations - This routine collects list of properties to be implemented...
bool isRecordType() const
Definition: Type.h:5626
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Emit a diagnostic.
Definition: Sema.h:1141
void DiagnoseMissingDesignatedInitOverrides(const ObjCImplementationDecl *ImplD, const ObjCInterfaceDecl *IFD)
void CheckObjCPropertyAttributes(Decl *PropertyPtrTy, SourceLocation Loc, unsigned &Attributes, bool propertyInPrimaryClass)
Ensure attributes are consistent with type.
Captures information about "declaration specifiers" specific to Objective-C.
Definition: DeclSpec.h:776
StringRef P
static ObjCPropertyDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation L, IdentifierInfo *Id, SourceLocation AtLocation, SourceLocation LParenLocation, QualType T, TypeSourceInfo *TSI, PropertyControl propControl=None)
Definition: DeclObjC.cpp:2164
void AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false)
AddFactoryMethodToGlobalPool - Same as above, but for factory methods.
Definition: Sema.h:3297
void MarkDeclRefReferenced(DeclRefExpr *E)
Perform reference-marking and odr-use handling for a DeclRefExpr.
Definition: SemaExpr.cpp:14160
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Calls Lexer::getLocForEndOfToken()
Definition: Sema.cpp:45
A container of type source information.
Definition: Decl.h:62
void ProcessPropertyDecl(ObjCPropertyDecl *property)
Process the specified property declaration and create decls for the setters and getters as needed...
bool isArcWeakrefUnavailable() const
isArcWeakrefUnavailable - Checks for a class or one of its super classes to be incompatible with __we...
Definition: DeclObjC.cpp:390
void setPropertyAccessor(bool isAccessor)
Definition: DeclObjC.h:422
Decl * ActOnPropertyImplDecl(Scope *S, SourceLocation AtLoc, SourceLocation PropertyLoc, bool ImplKind, IdentifierInfo *PropertyId, IdentifierInfo *PropertyIvar, SourceLocation PropertyIvarLoc, ObjCPropertyQueryKind QueryKind)
ActOnPropertyImplDecl - This routine performs semantic checks and builds the AST node for a property ...
RAII object to handle the state changes required to synthesize a function body.
Definition: Sema.h:670
QualType getUsageType(QualType objectType) const
Retrieve the type of this instance variable when viewed as a member of a specific object type...
Definition: DeclObjC.cpp:1747
llvm::DenseMap< const ObjCProtocolDecl *, ObjCPropertyDecl * > ProtocolPropertyMap
Definition: DeclObjC.h:1026
static unsigned getOwnershipRule(unsigned attr)
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:113
bool ClassImplementsProtocol(ObjCProtocolDecl *lProto, bool lookupCategory, bool RHSIsQualifiedID=false)
ClassImplementsProtocol - Checks that &#39;lProto&#39; protocol has been implemented in IDecl class...
Definition: DeclObjC.cpp:1636
static InitializedEntity InitializeResult(SourceLocation ReturnLoc, QualType Type, bool NRVO)
Create the initialization entity for the result of a function.
static ObjCPropertyDecl * findPropertyDecl(const DeclContext *DC, const IdentifierInfo *propertyID, ObjCPropertyQueryKind queryKind)
Lookup a property by name in the specified DeclContext.
Definition: DeclObjC.cpp:154
ParmVarDecl - Represents a parameter to a function.
Definition: Decl.h:1377
bool isObjCRetainableType() const
Definition: Type.cpp:3741
Defines the clang::Expr interface and subclasses for C++ expressions.
IdentifierInfo * getIdentifier() const
getIdentifier - Get the identifier that names the category interface associated with this implementat...
Definition: DeclObjC.h:2412
QualType getType() const
Definition: DeclObjC.h:781
The collection of all-type qualifiers we support.
Definition: Type.h:118
TypeSourceInfo * getTypeSourceInfo() const
Definition: DeclObjC.h:779
static void CollectImmediateProperties(ObjCContainerDecl *CDecl, ObjCContainerDecl::PropertyMap &PropMap, ObjCContainerDecl::PropertyMap &SuperPropMap, bool CollectClassPropsOnly=false, bool IncludeProtocols=true)
CollectImmediateProperties - This routine collects all properties in the class and its conforming pro...
One of these records is kept for each identifier that is lexed.
StringRef getBufferData(FileID FID, bool *Invalid=nullptr) const
Return a StringRef to the source buffer data for the specified FileID.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:92
The results of name lookup within a DeclContext.
Definition: DeclBase.h:1078
bool isObjCARCImplicitlyUnretainedType() const
Determines if this type, which must satisfy isObjCLifetimeType(), is implicitly __unsafe_unretained r...
Definition: Type.cpp:3703
ObjCMethodFamily
A family of Objective-C methods.
ObjCPropertyDecl * FindPropertyVisibleInPrimaryClass(IdentifierInfo *PropertyId, ObjCPropertyQueryKind QueryKind) const
FindPropertyVisibleInPrimaryClass - Finds declaration of the property with name &#39;PropertyId&#39; in the p...
Definition: DeclObjC.cpp:346
all_protocol_range all_referenced_protocols() const
Definition: DeclObjC.h:1333
ObjCMethodDecl * getClassMethod(Selector Sel, bool AllowHidden=false) const
Definition: DeclObjC.h:1011
bool hasSameType(QualType T1, QualType T2) const
Determine whether the given types T1 and T2 are equivalent.
Definition: ASTContext.h:2029
Token - This structure provides full information about a lexed token.
Definition: Token.h:35
method_range methods() const
Definition: DeclObjC.h:964
int Category
Definition: Format.cpp:1219
bool hasSameUnqualifiedType(QualType T1, QualType T2) const
Determine whether the given types are equivalent after cvr-qualifiers have been removed.
Definition: ASTContext.h:2054
IdentifierTable & Idents
Definition: ASTContext.h:478
This little struct is used to capture information about structure field declarators, which is basically just a bitfield size.
Definition: DeclSpec.h:2388
An r-value expression (a pr-value in the C++11 taxonomy) produces a temporary value.
Definition: Specifiers.h:105
SourceLocation getBeginLoc() const
Get the begin source location.
Definition: TypeLoc.cpp:169
bool IsClassExtension() const
Definition: DeclObjC.h:2274
void setObjCWeakProperty(bool Val=true)
Definition: DeclSpec.h:2338
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
ObjCContainerDecl - Represents a container for method declarations.
Definition: DeclObjC.h:901
const LangOptions & getLangOpts() const
Definition: ASTContext.h:628
ObjCMethodFamily getMethodFamily() const
Determines the family of this method.
Definition: DeclObjC.cpp:913
static ObjCPropertyImplDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation atLoc, SourceLocation L, ObjCPropertyDecl *property, Kind PK, ObjCIvarDecl *ivarDecl, SourceLocation ivarLoc)
Definition: DeclObjC.cpp:2192
AssignConvertType CheckAssignmentConstraints(SourceLocation Loc, QualType LHSType, QualType RHSType)
CheckAssignmentConstraints - Perform type checking for assignment, argument passing, variable initialization, and function return values.
Definition: SemaExpr.cpp:7399
Whether values of this type can be null is (explicitly) unspecified.
ObjCPropertyImplDecl * FindPropertyImplIvarDecl(IdentifierInfo *ivarId) const
FindPropertyImplIvarDecl - This method lookup the ivar in the list of properties implemented in this ...
Definition: DeclObjC.cpp:2041
bool hasDesignatedInitializers() const
Returns true if this interface decl contains at least one initializer marked with the &#39;objc_designate...
Definition: DeclObjC.cpp:1458
static void DiagnoseUnimplementedAccessor(Sema &S, ObjCInterfaceDecl *PrimaryClass, Selector Method, ObjCImplDecl *IMPDecl, ObjCContainerDecl *CDecl, ObjCCategoryDecl *C, ObjCPropertyDecl *Prop, llvm::SmallPtrSet< const ObjCMethodDecl *, 8 > &SMap)
Selector getSetterName() const
Definition: DeclObjC.h:857
Values of this type can never be null.
ObjCProtocolDecl * getDefinition()
Retrieve the definition of this protocol, if any.
Definition: DeclObjC.h:2098
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:39
bool declaresSameEntity(const Decl *D1, const Decl *D2)
Determine whether two declarations declare the same entity.
Definition: DeclBase.h:1050
Represents an Objective-C protocol declaration.
Definition: DeclObjC.h:1968
Preprocessor & PP
Definition: Sema.h:300
Represents an ObjC class declaration.
Definition: DeclObjC.h:1091
propimpl_range property_impls() const
Definition: DeclObjC.h:2351
PropertyAttributeKind getPropertyAttributes() const
Definition: DeclObjC.h:792
QualType getType() const
Definition: Decl.h:599
bool isInvalid() const
const LangOptions & LangOpts
Definition: Sema.h:299
This object can be modified without requiring retains or releases.
Definition: Type.h:139
void AtomicPropertySetterGetterRules(ObjCImplDecl *IMPDecl, ObjCInterfaceDecl *IDecl)
AtomicPropertySetterGetterRules - This routine enforces the rule (via warning) when atomic property h...
void setGetterCXXConstructor(Expr *getterCXXConstructor)
Definition: DeclObjC.h:2746
void AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method, bool impl=false)
AddInstanceMethodToGlobalPool - All instance methods in a translation unit are added to a global pool...
Definition: Sema.h:3292
void CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod, ObjCInterfaceDecl *CurrentClass, ResultTypeCompatibilityKind RTC)
static void CheckPropertyAgainstProtocol(Sema &S, ObjCPropertyDecl *Prop, ObjCProtocolDecl *Proto, llvm::SmallPtrSetImpl< ObjCProtocolDecl * > &Known)
Check this Objective-C property against a property declared in the given protocol.
ObjCPropertyImplDecl - Represents implementation declaration of a property in a class or category imp...
Definition: DeclObjC.h:2655
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:265
static void AddPropertyAttrs(Sema &S, ObjCMethodDecl *PropertyMethod, ObjCPropertyDecl *Property)
AddPropertyAttrs - Propagates attributes from a property to the implicitly-declared getter or setter ...
Qualifiers::ObjCLifetime getObjCLifetime() const
Returns lifetime attribute of this type.
Definition: Type.h:1010
ObjCPropertyAttributeKind getPropertyAttributes() const
Definition: DeclSpec.h:828
llvm::SmallPtrSet< Selector, 8 > SelectorSet
Definition: Sema.h:3114
ObjCPropertyImplDecl * FindPropertyImplDecl(IdentifierInfo *propertyId, ObjCPropertyQueryKind queryKind) const
FindPropertyImplDecl - This method looks up a previous ObjCPropertyImplDecl added to the list of thos...
Definition: DeclObjC.cpp:2054
static ImplicitCastExpr * Create(const ASTContext &Context, QualType T, CastKind Kind, Expr *Operand, const CXXCastPath *BasePath, ExprValueKind Cat)
Definition: Expr.cpp:1652
ObjCPropertyDecl * FindPropertyDeclaration(const IdentifierInfo *PropertyId, ObjCPropertyQueryKind QueryKind) const
FindPropertyDeclaration - Finds declaration of the property given its name in &#39;PropertyId&#39; and return...
Definition: DeclObjC.cpp:213
void addObjCLifetime(ObjCLifetime type)
Definition: Type.h:316
ID
Defines the set of possible language-specific address spaces.
Definition: AddressSpaces.h:27
SplitQualType split() const
Divides a QualType into its unqualified type and a set of local qualifiers.
Definition: Type.h:5354
Expr - This represents one expression.
Definition: Expr.h:105
static ObjCMethodDecl * Create(ASTContext &C, SourceLocation beginLoc, SourceLocation endLoc, Selector SelInfo, QualType T, TypeSourceInfo *ReturnTInfo, DeclContext *contextDecl, bool isInstance=true, bool isVariadic=false, bool isPropertyAccessor=false, bool isImplicitlyDeclared=false, bool isDefined=false, ImplementationControl impControl=None, bool HasRelatedResultType=false)
Definition: DeclObjC.cpp:750
static ObjCPropertyDecl::PropertyAttributeKind makePropertyAttributesAsWritten(unsigned Attributes)
bool isObjCGCWeak() const
true when Type is objc&#39;s weak.
Definition: Type.h:1000
static bool hasWrittenStorageAttribute(ObjCPropertyDecl *Prop, ObjCPropertyQueryKind QueryKind)
Determine whether any storage attributes were written on the property.
Defines the clang::Preprocessor interface.
ParmVarDecl *const * param_iterator
Definition: DeclObjC.h:350
Stores token information for comparing actual tokens with predefined values.
Definition: Preprocessor.h:65
bool RequireCompleteType(SourceLocation Loc, QualType T, TypeDiagnoser &Diagnoser)
Ensure that the type T is a complete type.
Definition: SemaType.cpp:6843
A std::pair-like structure for storing a qualified type split into its local qualifiers and its local...
Definition: Type.h:542
static Optional< NullabilityKind > stripOuterNullability(QualType &T)
Strip off the top-level nullability annotation on the given type, if it&#39;s there.
Definition: Type.cpp:3653
ObjCIvarDecl * lookupInstanceVariable(IdentifierInfo *IVarName, ObjCInterfaceDecl *&ClassDeclared)
Definition: DeclObjC.cpp:591
bool isInstanceMethod() const
Definition: DeclObjC.h:414
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:99
Qualifiers Quals
The local qualifiers.
Definition: Type.h:547
ObjCPropertyDecl * HandlePropertyInClassExtension(Scope *S, SourceLocation AtLoc, SourceLocation LParenLoc, FieldDeclarator &FD, Selector GetterSel, Selector SetterSel, const bool isReadWrite, unsigned &Attributes, const unsigned AttributesAsWritten, QualType T, TypeSourceInfo *TSI, tok::ObjCKeywordKind MethodImplKind)
Called by ActOnProperty to handle @property declarations in class extensions.
DeclarationName getDeclName() const
getDeclName - Get the actual, stored name of the declaration, which may be a special name...
Definition: Decl.h:258
SourceLocation getLocEnd() const LLVM_READONLY
Definition: TypeLoc.h:131
ObjCMethodDecl * lookupPropertyAccessor(const Selector Sel, const ObjCCategoryDecl *Cat, bool IsClassProperty) const
Lookup a setter or getter in the class hierarchy, including in all categories except for category pas...
Definition: DeclObjC.h:1770
const SourceManager & SM
Definition: Format.cpp:1206
ObjCKeywordKind
Provides a namespace for Objective-C keywords which start with an &#39;@&#39;.
Definition: TokenKinds.h:41
void DefaultSynthesizeProperties(Scope *S, ObjCImplDecl *IMPDecl, ObjCInterfaceDecl *IDecl)
DefaultSynthesizeProperties - This routine default synthesizes all properties which must be synthesiz...
bool hasObjCLifetime() const
Definition: Type.h:308
There is no lifetime qualification on this type.
Definition: Type.h:135
TypeLoc getTypeLoc() const
Return the TypeLoc wrapper for the type source info.
Definition: TypeLoc.h:215
void makeDeclVisibleInContext(NamedDecl *D)
Makes a declaration visible within this context.
Definition: DeclBase.cpp:1600
bool isNonFragile() const
Does this runtime follow the set of implied behaviors for a "non-fragile" ABI?
Definition: ObjCRuntime.h:80
Assigning into this object requires the old value to be released and the new value to be retained...
Definition: Type.h:146
Encodes a location in the source.
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
ObjCPropertyQueryKind
Definition: DeclObjC.h:687
bool isValid() const
Return true if this is a valid SourceLocation object.
TypeSourceInfo * getTrivialTypeSourceInfo(QualType T, SourceLocation Loc=SourceLocation()) const
Allocate a TypeSourceInfo where all locations have been initialized to a given location, which defaults to the empty location.
bool getSynthesize() const
Definition: DeclObjC.h:1895
static Qualifiers::ObjCLifetime getImpliedARCOwnership(ObjCPropertyDecl::PropertyAttributeKind attrs, QualType type)
getImpliedARCOwnership - Given a set of property attributes and a type, infer an expected lifetime...
ObjCCategoryDecl - Represents a category declaration.
Definition: DeclObjC.h:2171
const ObjCInterfaceDecl * getClassInterface() const
Definition: DeclObjC.h:2325
QualType getObjCGCQualType(QualType T, Qualifiers::GC gcAttr) const
Return the uniqued reference to the type for an Objective-C gc-qualified type.
ObjCPropertyDecl * CreatePropertyDecl(Scope *S, ObjCContainerDecl *CDecl, SourceLocation AtLoc, SourceLocation LParenLoc, FieldDeclarator &FD, Selector GetterSel, Selector SetterSel, const bool isReadWrite, const unsigned Attributes, const unsigned AttributesAsWritten, QualType T, TypeSourceInfo *TSI, tok::ObjCKeywordKind MethodImplKind, DeclContext *lexicalDC=nullptr)
Called by ActOnProperty and HandlePropertyInClassExtension to handle creating the ObjcPropertyDecl fo...
CanQualType VoidTy
Definition: ASTContext.h:928
bool isPropertyAccessor() const
Definition: DeclObjC.h:421
void DiagnoseUnimplementedProperties(Scope *S, ObjCImplDecl *IMPDecl, ObjCContainerDecl *CDecl, bool SynthesizeProperties)
DiagnoseUnimplementedProperties - This routine warns on those properties which must be implemented by...
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:699
ObjCProtocolDecl * LookupProtocol(IdentifierInfo *II, SourceLocation IdLoc, RedeclarationKind Redecl=NotForRedeclaration)
Find the protocol with the given name, if any.
QualType getReturnType() const
Definition: DeclObjC.h:330
lookup_result lookup(DeclarationName Name) const
lookup - Find the declarations (if any) with the given Name in this context.
Definition: DeclBase.cpp:1428
QualType getAttributedType(AttributedType::Kind attrKind, QualType modifiedType, QualType equivalentType)
Indicates that the nullability of the type was spelled with a property attribute rather than a type q...
Definition: DeclObjC.h:718
Assigning into this object requires a lifetime extension.
Definition: Type.h:152
QualType getType() const
Return the type wrapped by this type source info.
Definition: Decl.h:70
SourceLocation getLParenLoc() const
Definition: DeclObjC.h:776
void DiagnoseOwningPropertyGetterSynthesis(const ObjCImplementationDecl *D)
llvm::SmallVector< ObjCPropertyDecl *, 8 > PropertyDeclOrder
Definition: DeclObjC.h:1028
void setSetterCXXAssignment(Expr *setterCXXAssignment)
Definition: DeclObjC.h:2753
static void checkARCPropertyImpl(Sema &S, SourceLocation propertyImplLoc, ObjCPropertyDecl *property, ObjCIvarDecl *ivar)
bool propertyTypesAreCompatible(QualType, QualType)
ExprResult PerformCopyInitialization(const InitializedEntity &Entity, SourceLocation EqualLoc, ExprResult Init, bool TopLevelOfInitList=false, bool AllowExplicit=false)
Definition: SemaInit.cpp:7916
instmeth_range instance_methods() const
Definition: DeclObjC.h:979
ObjCCategoryDecl * FindCategoryDeclaration(IdentifierInfo *CategoryId) const
FindCategoryDeclaration - Finds category declaration in the list of categories for this class and ret...
Definition: DeclObjC.cpp:1597
static ParmVarDecl * Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg)
Definition: Decl.cpp:2332
static void setImpliedPropertyAttributeForReadOnlyProperty(ObjCPropertyDecl *property, ObjCIvarDecl *ivar)
setImpliedPropertyAttributeForReadOnlyProperty - This routine evaludates life-time attributes for a &#39;...
bool HasUserDeclaredSetterMethod(const ObjCPropertyDecl *P) const
This routine returns &#39;true&#39; if a user declared setter method was found in the class, its protocols, its super classes or categories.
Definition: DeclObjC.cpp:101
/file This file defines classes for searching and anlyzing source code clones.
void diagnoseNullResettableSynthesizedSetters(const ObjCImplDecl *impDecl)
Diagnose any null-resettable synthesized setters.
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1147
static bool SuperClassImplementsProperty(ObjCInterfaceDecl *IDecl, ObjCPropertyDecl *Prop)
prop_range properties() const
Definition: DeclObjC.h:921
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
Definition: ASTMatchers.h:2029
ObjCMethodDecl * getInstanceMethod(Selector Sel, bool AllowHidden=false) const
Definition: DeclObjC.h:1007
The basic abstraction for the target Objective-C runtime.
Definition: ObjCRuntime.h:25
SourceLocation getLocStart() const LLVM_READONLY
Definition: TypeLoc.h:130
bool CheckARCMethodDecl(ObjCMethodDecl *method)
Check a method declaration for compatibility with the Objective-C ARC conventions.
Selector getGetterName() const
Definition: DeclObjC.h:854
QualType getObjCObjectPointerType(QualType OIT) const
Return a ObjCObjectPointerType type for the given ObjCObjectType.
Selector getSelector() const
Definition: DeclObjC.h:328
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2013
static void DiagnosePropertyMismatchDeclInProtocols(Sema &S, SourceLocation AtLoc, ObjCInterfaceDecl *ClassDecl, ObjCPropertyDecl *Property)
DiagnosePropertyMismatchDeclInProtocols - diagnose properties declared in inherited protocols with mi...
known_extensions_range known_extensions() const
Definition: DeclObjC.h:1663
QualType getNonReferenceType() const
If Type is a reference type (e.g., const int&), returns the type that the reference refers to ("const...
Definition: Type.h:5519
Represents a pointer to an Objective C object.
Definition: Type.h:5078
static ObjCIvarDecl * Create(ASTContext &C, ObjCContainerDecl *DC, SourceLocation StartLoc, SourceLocation IdLoc, IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, AccessControl ac, Expr *BW=nullptr, bool synthesized=false)
Definition: DeclObjC.cpp:1681
bool isObjCObjectType() const
Definition: Type.h:5644
ObjCImplementationDecl - Represents a class definition - this is where method definitions are specifi...
Definition: DeclObjC.h:2461
ObjCMethodDecl * getGetterMethodDecl() const
Definition: DeclObjC.h:860
ObjCMethodDecl * lookupMethod(Selector Sel, bool isInstance, bool shallowCategoryLookup=false, bool followSuper=true, const ObjCCategoryDecl *C=nullptr) const
lookupMethod - This method returns an instance/class method by looking in the class, its categories, and its super classes (using a linear search).
Definition: DeclObjC.cpp:653
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:5905
void overwritePropertyAttributes(unsigned PRVal)
Definition: DeclObjC.h:798
instprop_range instance_properties() const
Definition: DeclObjC.h:934
const internal::VariadicDynCastAllOfMatcher< Stmt, CallExpr > callExpr
Matches call expressions.
Definition: ASTMatchers.h:1066
protocol_range protocols() const
Definition: DeclObjC.h:1278
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:78
void addDecl(Decl *D)
Add the declaration D into this context.
Definition: DeclBase.cpp:1317
bool canAssignObjCInterfaces(const ObjCObjectPointerType *LHSOPT, const ObjCObjectPointerType *RHSOPT)
canAssignObjCInterfaces - Return true if the two interface types are compatible for assignment from R...
static void checkAtomicPropertyMismatch(Sema &S, ObjCPropertyDecl *OldProperty, ObjCPropertyDecl *NewProperty, bool PropagateAtomicity)
Check for a mismatch in the atomicity of the given properties.
ObjCIvarRefExpr - A reference to an ObjC instance variable.
Definition: ExprObjC.h:479
SourceManager & getSourceManager()
Definition: ASTContext.h:580
IdentifierInfo * getIdentifier() const
Definition: DeclSpec.h:2086
bool isObjCGCStrong() const
true when Type is objc&#39;s strong.
Definition: Type.h:1005
AccessControl getAccessControl() const
Definition: DeclObjC.h:1888
static bool LocPropertyAttribute(ASTContext &Context, const char *attrName, SourceLocation LParenLoc, SourceLocation &Loc)
Reading or writing from this object requires a barrier call.
Definition: Type.h:149
Expr * MaybeCreateExprWithCleanups(Expr *SubExpr)
MaybeCreateExprWithCleanups - If the current full-expression requires any cleanups, surround it with a ExprWithCleanups node.
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2092
void ProcessDeclAttributes(Scope *S, Decl *D, const Declarator &PD)
ProcessDeclAttributes - Given a declarator (PD) with attributes indicated in it, apply them to D...
Compatible - the types are compatible according to the standard.
Definition: Sema.h:8712
bool isReadOnly() const
isReadOnly - Return true iff the property has a setter.
Definition: DeclObjC.h:813
ObjCIvarDecl - Represents an ObjC instance variable.
Definition: DeclObjC.h:1849
static unsigned deducePropertyOwnershipFromType(Sema &S, QualType T)
ObjCPropertyQueryKind getQueryKind() const
Definition: DeclObjC.h:830
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:313
unsigned kind
All of the diagnostics that can be emitted by the frontend.
Definition: DiagnosticIDs.h:43
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:115
void setPropertyAttributes(PropertyAttributeKind PRVal)
Definition: DeclObjC.h:795
void DiagnosePropertyMismatch(ObjCPropertyDecl *Property, ObjCPropertyDecl *SuperProperty, const IdentifierInfo *Name, bool OverridingProtocolProperty)
DiagnosePropertyMismatch - Compares two properties for their attributes and types and warns on a vari...
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:314
PropertyAttributeKind getPropertyAttributesAsWritten() const
Definition: DeclObjC.h:802
bool DiagnosePropertyAccessorMismatch(ObjCPropertyDecl *PD, ObjCMethodDecl *Getter, SourceLocation Loc)
bool isFragile() const
The inverse of isNonFragile(): does this runtime follow the set of implied behaviors for a "fragile" ...
Definition: ObjCRuntime.h:95
void collectPropertiesToImplement(PropertyMap &PM, PropertyDeclOrder &PO) const override
This routine collects list of properties to be implemented in the class.
Definition: DeclObjC.cpp:370
static const unsigned OwnershipMask
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:932
IRgen optimization opportunities The common pattern of short x
SourceLocation getLocForStartOfFile(FileID FID) const
Return the source location corresponding to the first byte of the specified file. ...
void addPropertyImplementation(ObjCPropertyImplDecl *property)
Definition: DeclObjC.cpp:2013
An l-value expression is a reference to an object with independent storage.
Definition: Specifiers.h:109
A trivial tuple used to represent a source range.
ASTContext & Context
Definition: Sema.h:301
bool isArithmeticType() const
Definition: Type.cpp:1834
std::pair< FileID, unsigned > getDecomposedLoc(SourceLocation Loc) const
Decompose the specified location into a raw FileID + Offset pair.
ExprResult BuildBinOp(Scope *S, SourceLocation OpLoc, BinaryOperatorKind Opc, Expr *LHSExpr, Expr *RHSExpr)
Definition: SemaExpr.cpp:11360
llvm::DenseMap< const Stmt *, CFGBlock * > SMap
Definition: CFGStmtMap.cpp:22
IdentifierInfo * getDefaultSynthIvarName(ASTContext &Ctx) const
Get the default name of the synthesized ivar.
Definition: DeclObjC.cpp:202
void setType(QualType newType)
Definition: Decl.h:600
ObjCCategoryImplDecl - An object of this class encapsulates a category @implementation declaration...
Definition: DeclObjC.h:2380
This class handles loading and caching of source files into memory.
Preprocessor & getPreprocessor() const
Definition: Sema.h:1070
static void checkPropertyDeclWithOwnership(Sema &S, ObjCPropertyDecl *property)
Check the internal consistency of a property declaration with an explicit ownership qualifier...
TypeSourceInfo * GetTypeForDeclarator(Declarator &D, Scope *S)
GetTypeForDeclarator - Convert the type for the specified declarator to Type instances.
Definition: SemaType.cpp:4592
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:97