SemaDeclObjC.cpp revision 717250a2052ea65d95405127d4e5836a564dad18 
1//===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC Declarations -------===//
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 declarations.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Sema.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/DeclObjC.h"
17#include "clang/Parse/Scope.h"
18
19using namespace clang;
20
21/// ObjCActOnStartOfMethodDef - This routine sets up parameters; invisible
22/// and user declared, in the method definition's AST.
23void Sema::ObjCActOnStartOfMethodDef(Scope *FnBodyScope, DeclTy *D) {
24  assert(getCurMethodDecl() == 0 && "Method parsing confused");
25  ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>((Decl *)D);
26
27  // If we don't have a valid method decl, simply return.
28  if (!MDecl)
29    return;
30
31  // Allow the rest of sema to find private method decl implementations.
32  if (MDecl->isInstance())
33    AddInstanceMethodToGlobalPool(MDecl);
34  else
35    AddFactoryMethodToGlobalPool(MDecl);
36
37  // Allow all of Sema to see that we are entering a method definition.
38  PushDeclContext(MDecl);
39
40  // Create Decl objects for each parameter, entrring them in the scope for
41  // binding to their use.
42  struct DeclaratorChunk::ParamInfo PI;
43
44  // Insert the invisible arguments, self and _cmd!
45  PI.Ident = &Context.Idents.get("self");
46  PI.IdentLoc = SourceLocation(); // synthesized vars have a null location.
47  QualType selfTy;
48  if (MDecl->isInstance()) {
49    selfTy = Context.getObjCIdType();
50    if (ObjCInterfaceDecl *OID = MDecl->getClassInterface()) {
51      // There may be no interface context due to error in declaration of the
52      // interface (which has been reported). Recover gracefully
53      selfTy = Context.getObjCInterfaceType(OID);
54      selfTy = Context.getPointerType(selfTy);
55    }
56  } else // we have a factory method.
57    selfTy = Context.getObjCClassType();
58  getCurMethodDecl()->setSelfDecl(CreateImplicitParameter(FnBodyScope,
59        PI.Ident, PI.IdentLoc, selfTy));
60
61  PI.Ident = &Context.Idents.get("_cmd");
62  getCurMethodDecl()->setCmdDecl(CreateImplicitParameter(FnBodyScope,
63        PI.Ident, PI.IdentLoc, Context.getObjCSelType()));
64
65  // Introduce all of the other parameters into this scope.
66  for (unsigned i = 0, e = MDecl->getNumParams(); i != e; ++i) {
67    ParmVarDecl *PDecl = MDecl->getParamDecl(i);
68    IdentifierInfo *II = PDecl->getIdentifier();
69    if (II)
70      PushOnScopeChains(PDecl, FnBodyScope);
71  }
72}
73
74Sema::DeclTy *Sema::
75ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
76                         IdentifierInfo *ClassName, SourceLocation ClassLoc,
77                         IdentifierInfo *SuperName, SourceLocation SuperLoc,
78                         DeclTy * const *ProtoRefs, unsigned NumProtoRefs,
79                         SourceLocation EndProtoLoc, AttributeList *AttrList) {
80  assert(ClassName && "Missing class identifier");
81
82  // Check for another declaration kind with the same name.
83  Decl *PrevDecl = LookupDecl(ClassName, Decl::IDNS_Ordinary, TUScope);
84  if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
85    Diag(ClassLoc, diag::err_redefinition_different_kind,
86         ClassName->getName());
87    Diag(PrevDecl->getLocation(), diag::err_previous_definition);
88  }
89
90  ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
91  if (IDecl) {
92    // Class already seen. Is it a forward declaration?
93    if (!IDecl->isForwardDecl())
94      Diag(AtInterfaceLoc, diag::err_duplicate_class_def, IDecl->getName());
95    else {
96      IDecl->setLocation(AtInterfaceLoc);
97      IDecl->setForwardDecl(false);
98    }
99  } else {
100    IDecl = ObjCInterfaceDecl::Create(Context, AtInterfaceLoc,
101                                      ClassName, ClassLoc);
102
103    ObjCInterfaceDecls[ClassName] = IDecl;
104    // Remember that this needs to be removed when the scope is popped.
105    TUScope->AddDecl(IDecl);
106  }
107
108  if (SuperName) {
109    ObjCInterfaceDecl* SuperClassEntry = 0;
110    // Check if a different kind of symbol declared in this scope.
111    PrevDecl = LookupDecl(SuperName, Decl::IDNS_Ordinary, TUScope);
112    if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
113      Diag(SuperLoc, diag::err_redefinition_different_kind,
114           SuperName->getName());
115      Diag(PrevDecl->getLocation(), diag::err_previous_definition);
116    }
117    else {
118      // Check that super class is previously defined
119      SuperClassEntry = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
120
121      if (!SuperClassEntry || SuperClassEntry->isForwardDecl()) {
122        Diag(SuperLoc, diag::err_undef_superclass,
123             SuperClassEntry ? SuperClassEntry->getName()
124                             : SuperName->getName(),
125             ClassName->getName(), SourceRange(AtInterfaceLoc, ClassLoc));
126      }
127    }
128    IDecl->setSuperClass(SuperClassEntry);
129    IDecl->setSuperClassLoc(SuperLoc);
130    IDecl->setLocEnd(SuperLoc);
131  } else { // we have a root class.
132    IDecl->setLocEnd(ClassLoc);
133  }
134
135  /// Check then save referenced protocols
136  if (NumProtoRefs) {
137    IDecl->addReferencedProtocols((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs);
138    IDecl->setLocEnd(EndProtoLoc);
139  }
140  return IDecl;
141}
142
143/// ActOnCompatiblityAlias - this action is called after complete parsing of
144/// @compaatibility_alias declaration. It sets up the alias relationships.
145Sema::DeclTy *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc,
146                                           IdentifierInfo *AliasName,
147                                           SourceLocation AliasLocation,
148                                           IdentifierInfo *ClassName,
149                                           SourceLocation ClassLocation) {
150  // Look for previous declaration of alias name
151  Decl *ADecl = LookupDecl(AliasName, Decl::IDNS_Ordinary, TUScope);
152  if (ADecl) {
153    if (isa<ObjCCompatibleAliasDecl>(ADecl)) {
154      Diag(AliasLocation, diag::warn_previous_alias_decl);
155      Diag(ADecl->getLocation(), diag::warn_previous_declaration);
156    }
157    else {
158      Diag(AliasLocation, diag::err_conflicting_aliasing_type,
159           AliasName->getName());
160      Diag(ADecl->getLocation(), diag::err_previous_declaration);
161    }
162    return 0;
163  }
164  // Check for class declaration
165  Decl *CDeclU = LookupDecl(ClassName, Decl::IDNS_Ordinary, TUScope);
166  ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU);
167  if (CDecl == 0) {
168    Diag(ClassLocation, diag::warn_undef_interface, ClassName->getName());
169    if (CDeclU)
170      Diag(CDeclU->getLocation(), diag::warn_previous_declaration);
171    return 0;
172  }
173
174  // Everything checked out, instantiate a new alias declaration AST.
175  ObjCCompatibleAliasDecl *AliasDecl =
176    ObjCCompatibleAliasDecl::Create(Context, AtLoc, AliasName, CDecl);
177
178  ObjCAliasDecls[AliasName] = AliasDecl;
179  TUScope->AddDecl(AliasDecl);
180  return AliasDecl;
181}
182
183Sema::DeclTy *
184Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc,
185                                  IdentifierInfo *ProtocolName,
186                                  SourceLocation ProtocolLoc,
187                                  DeclTy * const *ProtoRefs,
188                                  unsigned NumProtoRefs,
189                                  SourceLocation EndProtoLoc) {
190  assert(ProtocolName && "Missing protocol identifier");
191  ObjCProtocolDecl *PDecl = ObjCProtocols[ProtocolName];
192  if (PDecl) {
193    // Protocol already seen. Better be a forward protocol declaration
194    if (!PDecl->isForwardDecl()) {
195      Diag(ProtocolLoc, diag::err_duplicate_protocol_def,
196           ProtocolName->getName());
197      // Just return the protocol we already had.
198      // FIXME: don't leak the objects passed in!
199      return PDecl;
200    }
201
202    PDecl->setForwardDecl(false);
203  } else {
204    PDecl = ObjCProtocolDecl::Create(Context, AtProtoInterfaceLoc,ProtocolName);
205    PDecl->setForwardDecl(false);
206    ObjCProtocols[ProtocolName] = PDecl;
207  }
208
209  if (NumProtoRefs) {
210    /// Check then save referenced protocols.
211    PDecl->addReferencedProtocols((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs);
212    PDecl->setLocEnd(EndProtoLoc);
213  }
214  return PDecl;
215}
216
217/// FindProtocolDeclaration - This routine looks up protocols and
218/// issuer error if they are not declared. It returns list of protocol
219/// declarations in its 'Protocols' argument.
220void
221Sema::FindProtocolDeclaration(bool WarnOnDeclarations,
222                              const IdentifierLocPair *ProtocolId,
223                              unsigned NumProtocols,
224                              llvm::SmallVectorImpl<DeclTy*> &Protocols) {
225  for (unsigned i = 0; i != NumProtocols; ++i) {
226    ObjCProtocolDecl *PDecl = ObjCProtocols[ProtocolId[i].first];
227    if (!PDecl) {
228      Diag(ProtocolId[i].second, diag::err_undeclared_protocol,
229           ProtocolId[i].first->getName());
230      continue;
231    }
232
233    // If this is a forward declaration and we are supposed to warn in this
234    // case, do it.
235    if (WarnOnDeclarations && PDecl->isForwardDecl())
236      Diag(ProtocolId[i].second, diag::warn_undef_protocolref,
237           ProtocolId[i].first->getName());
238    Protocols.push_back(PDecl);
239  }
240}
241
242/// DiagnosePropertyMismatch - Compares two properties for their
243/// attributes and types and warns on a variety of inconsistancies.
244///
245void
246Sema::DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
247                               ObjCPropertyDecl *SuperProperty,
248                               const char *inheritedName) {
249  ObjCPropertyDecl::PropertyAttributeKind CAttr =
250  Property->getPropertyAttributes();
251  ObjCPropertyDecl::PropertyAttributeKind SAttr =
252  SuperProperty->getPropertyAttributes();
253  if ((CAttr & ObjCPropertyDecl::OBJC_PR_readonly)
254      && (SAttr & ObjCPropertyDecl::OBJC_PR_readwrite))
255    Diag(Property->getLocation(), diag::warn_readonly_property,
256               Property->getName(), inheritedName);
257  if ((CAttr & ObjCPropertyDecl::OBJC_PR_copy)
258      != (SAttr & ObjCPropertyDecl::OBJC_PR_copy))
259    Diag(Property->getLocation(), diag::warn_property_attribute,
260         Property->getName(), "copy", inheritedName,
261         SourceRange());
262  else if ((CAttr & ObjCPropertyDecl::OBJC_PR_retain)
263           != (SAttr & ObjCPropertyDecl::OBJC_PR_retain))
264    Diag(Property->getLocation(), diag::warn_property_attribute,
265         Property->getName(), "retain", inheritedName,
266         SourceRange());
267
268  if ((CAttr & ObjCPropertyDecl::OBJC_PR_nonatomic)
269      != (SAttr & ObjCPropertyDecl::OBJC_PR_nonatomic))
270    Diag(Property->getLocation(), diag::warn_property_attribute,
271         Property->getName(), "atomic", inheritedName,
272         SourceRange());
273  if (Property->getSetterName() != SuperProperty->getSetterName())
274    Diag(Property->getLocation(), diag::warn_property_attribute,
275         Property->getName(), "setter", inheritedName,
276         SourceRange());
277  if (Property->getGetterName() != SuperProperty->getGetterName())
278    Diag(Property->getLocation(), diag::warn_property_attribute,
279         Property->getName(), "getter", inheritedName,
280         SourceRange());
281
282  if (Context.getCanonicalType(Property->getType()) !=
283          Context.getCanonicalType(SuperProperty->getType()))
284    Diag(Property->getLocation(), diag::warn_property_type,
285         Property->getType().getAsString(),
286         inheritedName);
287
288}
289
290/// ComparePropertiesInBaseAndSuper - This routine compares property
291/// declarations in base and its super class, if any, and issues
292/// diagnostics in a variety of inconsistant situations.
293///
294void
295Sema::ComparePropertiesInBaseAndSuper(ObjCInterfaceDecl *IDecl) {
296  ObjCInterfaceDecl *SDecl = IDecl->getSuperClass();
297  if (!SDecl)
298    return;
299  for (ObjCInterfaceDecl::classprop_iterator S = SDecl->classprop_begin(),
300       E = SDecl->classprop_end(); S != E; ++S) {
301    ObjCPropertyDecl *SuperPDecl = (*S);
302    // Does property in super class has declaration in current class?
303    for (ObjCInterfaceDecl::classprop_iterator I = IDecl->classprop_begin(),
304         E = IDecl->classprop_end(); I != E; ++I) {
305      ObjCPropertyDecl *PDecl = (*I);
306      if (SuperPDecl->getIdentifier() == PDecl->getIdentifier())
307          DiagnosePropertyMismatch(PDecl, SuperPDecl, SDecl->getName());
308    }
309  }
310}
311
312/// MergeOneProtocolPropertiesIntoClass - This routine goes thru the list
313/// of properties declared in a protocol and adds them to the list
314/// of properties for current class if it is not there already.
315void
316Sema::MergeOneProtocolPropertiesIntoClass(ObjCInterfaceDecl *IDecl,
317                                          ObjCProtocolDecl *PDecl)
318{
319  llvm::SmallVector<ObjCPropertyDecl*, 16> mergeProperties;
320  for (ObjCProtocolDecl::classprop_iterator P = PDecl->classprop_begin(),
321       E = PDecl->classprop_end(); P != E; ++P) {
322    ObjCPropertyDecl *Pr = (*P);
323    ObjCInterfaceDecl::classprop_iterator CP, CE;
324    // Is this property already in  class's list of properties?
325    for (CP = IDecl->classprop_begin(), CE = IDecl->classprop_end();
326         CP != CE; ++CP)
327      if ((*CP)->getIdentifier() == Pr->getIdentifier())
328        break;
329    if (CP == CE)
330      // Add this property to list of properties for thie class.
331      mergeProperties.push_back(Pr);
332    else
333      // Property protocol already exist in class. Diagnose any mismatch.
334      DiagnosePropertyMismatch((*CP), Pr, PDecl->getName());
335    }
336  IDecl->mergeProperties(&mergeProperties[0], mergeProperties.size());
337}
338
339/// MergeProtocolPropertiesIntoClass - This routine merges properties
340/// declared in 'MergeItsProtocols' objects (which can be a class or an
341/// inherited protocol into the list of properties for class 'IDecl'
342///
343
344void
345Sema::MergeProtocolPropertiesIntoClass(ObjCInterfaceDecl *IDecl,
346                                       DeclTy *MergeItsProtocols) {
347  Decl *ClassDecl = static_cast<Decl *>(MergeItsProtocols);
348  if (ObjCInterfaceDecl *MDecl = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
349    for (ObjCInterfaceDecl::protocol_iterator P = MDecl->protocol_begin(),
350         E = MDecl->protocol_end(); P != E; ++P)
351      // Merge properties of class (*P) into IDECL's
352      MergeOneProtocolPropertiesIntoClass(IDecl, *P);
353
354    // Go thru the list of protocols for this class and recursively merge
355    // their properties into this class as well.
356    for (ObjCInterfaceDecl::protocol_iterator P = IDecl->protocol_begin(),
357         E = IDecl->protocol_end(); P != E; ++P)
358      MergeProtocolPropertiesIntoClass(IDecl, *P);
359  } else {
360    ObjCProtocolDecl *MD = cast<ObjCProtocolDecl>(ClassDecl);
361    for (ObjCProtocolDecl::protocol_iterator P = MD->protocol_begin(),
362         E = MD->protocol_end(); P != E; ++P)
363      MergeOneProtocolPropertiesIntoClass(IDecl, (*P));
364  }
365}
366
367/// ActOnForwardProtocolDeclaration -
368Action::DeclTy *
369Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc,
370                                      const IdentifierLocPair *IdentList,
371                                      unsigned NumElts) {
372  llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols;
373
374  for (unsigned i = 0; i != NumElts; ++i) {
375    IdentifierInfo *Ident = IdentList[i].first;
376    ObjCProtocolDecl *&PDecl = ObjCProtocols[Ident];
377    if (PDecl == 0) // Not already seen?
378      PDecl = ObjCProtocolDecl::Create(Context, IdentList[i].second, Ident);
379
380    Protocols.push_back(PDecl);
381  }
382  return ObjCForwardProtocolDecl::Create(Context, AtProtocolLoc,
383                                         &Protocols[0], Protocols.size());
384}
385
386Sema::DeclTy *Sema::
387ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
388                            IdentifierInfo *ClassName, SourceLocation ClassLoc,
389                            IdentifierInfo *CategoryName,
390                            SourceLocation CategoryLoc,
391                            DeclTy * const *ProtoRefs,
392                            unsigned NumProtoRefs,
393                            SourceLocation EndProtoLoc) {
394  ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName);
395
396  ObjCCategoryDecl *CDecl =
397    ObjCCategoryDecl::Create(Context, AtInterfaceLoc, CategoryName);
398  CDecl->setClassInterface(IDecl);
399
400  /// Check that class of this category is already completely declared.
401  if (!IDecl || IDecl->isForwardDecl())
402    Diag(ClassLoc, diag::err_undef_interface, ClassName->getName());
403  else {
404    /// Check for duplicate interface declaration for this category
405    ObjCCategoryDecl *CDeclChain;
406    for (CDeclChain = IDecl->getCategoryList(); CDeclChain;
407         CDeclChain = CDeclChain->getNextClassCategory()) {
408      if (CategoryName && CDeclChain->getIdentifier() == CategoryName) {
409        Diag(CategoryLoc, diag::warn_dup_category_def, ClassName->getName(),
410             CategoryName->getName());
411        break;
412      }
413    }
414    if (!CDeclChain)
415      CDecl->insertNextClassCategory();
416  }
417
418  if (NumProtoRefs) {
419    CDecl->addReferencedProtocols((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs);
420    CDecl->setLocEnd(EndProtoLoc);
421  }
422  return CDecl;
423}
424
425/// ActOnStartCategoryImplementation - Perform semantic checks on the
426/// category implementation declaration and build an ObjCCategoryImplDecl
427/// object.
428Sema::DeclTy *Sema::ActOnStartCategoryImplementation(
429                      SourceLocation AtCatImplLoc,
430                      IdentifierInfo *ClassName, SourceLocation ClassLoc,
431                      IdentifierInfo *CatName, SourceLocation CatLoc) {
432  ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName);
433  ObjCCategoryImplDecl *CDecl =
434    ObjCCategoryImplDecl::Create(Context, AtCatImplLoc, CatName, IDecl);
435  /// Check that class of this category is already completely declared.
436  if (!IDecl || IDecl->isForwardDecl())
437    Diag(ClassLoc, diag::err_undef_interface, ClassName->getName());
438
439  /// TODO: Check that CatName, category name, is not used in another
440  // implementation.
441  return CDecl;
442}
443
444Sema::DeclTy *Sema::ActOnStartClassImplementation(
445                      SourceLocation AtClassImplLoc,
446                      IdentifierInfo *ClassName, SourceLocation ClassLoc,
447                      IdentifierInfo *SuperClassname,
448                      SourceLocation SuperClassLoc) {
449  ObjCInterfaceDecl* IDecl = 0;
450  // Check for another declaration kind with the same name.
451  Decl *PrevDecl = LookupDecl(ClassName, Decl::IDNS_Ordinary, TUScope);
452  if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
453    Diag(ClassLoc, diag::err_redefinition_different_kind,
454         ClassName->getName());
455    Diag(PrevDecl->getLocation(), diag::err_previous_definition);
456  }
457  else {
458    // Is there an interface declaration of this class; if not, warn!
459    IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
460    if (!IDecl)
461      Diag(ClassLoc, diag::warn_undef_interface, ClassName->getName());
462  }
463
464  // Check that super class name is valid class name
465  ObjCInterfaceDecl* SDecl = 0;
466  if (SuperClassname) {
467    // Check if a different kind of symbol declared in this scope.
468    PrevDecl = LookupDecl(SuperClassname, Decl::IDNS_Ordinary, TUScope);
469    if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
470      Diag(SuperClassLoc, diag::err_redefinition_different_kind,
471           SuperClassname->getName());
472      Diag(PrevDecl->getLocation(), diag::err_previous_definition);
473    }
474    else {
475      SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
476      if (!SDecl)
477        Diag(SuperClassLoc, diag::err_undef_superclass,
478             SuperClassname->getName(), ClassName->getName());
479      else if (IDecl && IDecl->getSuperClass() != SDecl) {
480        // This implementation and its interface do not have the same
481        // super class.
482        Diag(SuperClassLoc, diag::err_conflicting_super_class,
483             SDecl->getName());
484        Diag(SDecl->getLocation(), diag::err_previous_definition);
485      }
486    }
487  }
488
489  if (!IDecl) {
490    // Legacy case of @implementation with no corresponding @interface.
491    // Build, chain & install the interface decl into the identifier.
492    IDecl = ObjCInterfaceDecl::Create(Context, AtClassImplLoc, ClassName,
493                                      ClassLoc, false, true);
494    ObjCInterfaceDecls[ClassName] = IDecl;
495    IDecl->setSuperClass(SDecl);
496    IDecl->setLocEnd(ClassLoc);
497
498    // Remember that this needs to be removed when the scope is popped.
499    TUScope->AddDecl(IDecl);
500  }
501
502  ObjCImplementationDecl* IMPDecl =
503    ObjCImplementationDecl::Create(Context, AtClassImplLoc, ClassName,
504                                   IDecl, SDecl);
505
506  // Check that there is no duplicate implementation of this class.
507  if (ObjCImplementations[ClassName])
508    // FIXME: Don't leak everything!
509    Diag(ClassLoc, diag::err_dup_implementation_class, ClassName->getName());
510  else // add it to the list.
511    ObjCImplementations[ClassName] = IMPDecl;
512  return IMPDecl;
513}
514
515void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
516                                    ObjCIvarDecl **ivars, unsigned numIvars,
517                                    SourceLocation RBrace) {
518  assert(ImpDecl && "missing implementation decl");
519  ObjCInterfaceDecl* IDecl = getObjCInterfaceDecl(ImpDecl->getIdentifier());
520  if (!IDecl)
521    return;
522  /// Check case of non-existing @interface decl.
523  /// (legacy objective-c @implementation decl without an @interface decl).
524  /// Add implementations's ivar to the synthesize class's ivar list.
525  if (IDecl->ImplicitInterfaceDecl()) {
526    IDecl->addInstanceVariablesToClass(ivars, numIvars, RBrace);
527    return;
528  }
529  // If implementation has empty ivar list, just return.
530  if (numIvars == 0)
531    return;
532
533  assert(ivars && "missing @implementation ivars");
534
535  // Check interface's Ivar list against those in the implementation.
536  // names and types must match.
537  //
538  unsigned j = 0;
539  ObjCInterfaceDecl::ivar_iterator
540    IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end();
541  for (; numIvars > 0 && IVI != IVE; ++IVI) {
542    ObjCIvarDecl* ImplIvar = ivars[j++];
543    ObjCIvarDecl* ClsIvar = *IVI;
544    assert (ImplIvar && "missing implementation ivar");
545    assert (ClsIvar && "missing class ivar");
546    if (ImplIvar->getCanonicalType() != ClsIvar->getCanonicalType()) {
547      Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type,
548           ImplIvar->getIdentifier()->getName());
549      Diag(ClsIvar->getLocation(), diag::err_previous_definition,
550           ClsIvar->getIdentifier()->getName());
551    }
552    // TODO: Two mismatched (unequal width) Ivar bitfields should be diagnosed
553    // as error.
554    else if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) {
555      Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name,
556           ImplIvar->getIdentifier()->getName());
557      Diag(ClsIvar->getLocation(), diag::err_previous_definition,
558           ClsIvar->getIdentifier()->getName());
559      return;
560    }
561    --numIvars;
562  }
563
564  if (numIvars > 0)
565    Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count);
566  else if (IVI != IVE)
567    Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count);
568}
569
570void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method,
571                               bool &IncompleteImpl) {
572  if (!IncompleteImpl) {
573    Diag(ImpLoc, diag::warn_incomplete_impl);
574    IncompleteImpl = true;
575  }
576  Diag(ImpLoc, diag::warn_undef_method_impl, method->getSelector().getName());
577}
578
579/// CheckProtocolMethodDefs - This routine checks unimplemented methods
580/// Declared in protocol, and those referenced by it.
581void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc,
582                                   ObjCProtocolDecl *PDecl,
583                                   bool& IncompleteImpl,
584                                   const llvm::DenseSet<Selector> &InsMap,
585                                   const llvm::DenseSet<Selector> &ClsMap) {
586  // check unimplemented instance methods.
587  for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
588       E = PDecl->instmeth_end(); I != E; ++I) {
589    ObjCMethodDecl *method = *I;
590    if (!InsMap.count(method->getSelector()) &&
591        method->getImplementationControl() != ObjCMethodDecl::Optional)
592      WarnUndefinedMethod(ImpLoc, method, IncompleteImpl);
593  }
594  // check unimplemented class methods
595  for (ObjCProtocolDecl::classmeth_iterator I = PDecl->classmeth_begin(),
596       E = PDecl->classmeth_end(); I != E; ++I) {
597    ObjCMethodDecl *method = *I;
598    if (!ClsMap.count(method->getSelector()) &&
599        method->getImplementationControl() != ObjCMethodDecl::Optional)
600      WarnUndefinedMethod(ImpLoc, method, IncompleteImpl);
601  }
602  // Check on this protocols's referenced protocols, recursively.
603  for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
604       E = PDecl->protocol_end(); PI != E; ++PI)
605    CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap);
606}
607
608void Sema::ImplMethodsVsClassMethods(ObjCImplementationDecl* IMPDecl,
609                                     ObjCInterfaceDecl* IDecl) {
610  llvm::DenseSet<Selector> InsMap;
611  // Check and see if instance methods in class interface have been
612  // implemented in the implementation class.
613  for (ObjCImplementationDecl::instmeth_iterator I = IMPDecl->instmeth_begin(),
614       E = IMPDecl->instmeth_end(); I != E; ++I)
615    InsMap.insert((*I)->getSelector());
616
617  bool IncompleteImpl = false;
618  for (ObjCInterfaceDecl::instmeth_iterator I = IDecl->instmeth_begin(),
619       E = IDecl->instmeth_end(); I != E; ++I)
620    if (!(*I)->isSynthesized() && !InsMap.count((*I)->getSelector()))
621      WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl);
622
623  llvm::DenseSet<Selector> ClsMap;
624  // Check and see if class methods in class interface have been
625  // implemented in the implementation class.
626  for (ObjCImplementationDecl::classmeth_iterator I =IMPDecl->classmeth_begin(),
627       E = IMPDecl->classmeth_end(); I != E; ++I)
628    ClsMap.insert((*I)->getSelector());
629
630  for (ObjCInterfaceDecl::classmeth_iterator I = IDecl->classmeth_begin(),
631       E = IDecl->classmeth_end(); I != E; ++I)
632    if (!ClsMap.count((*I)->getSelector()))
633      WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl);
634
635  // Check the protocol list for unimplemented methods in the @implementation
636  // class.
637  const ObjCList<ObjCProtocolDecl> &Protocols =
638    IDecl->getReferencedProtocols();
639  for (ObjCList<ObjCProtocolDecl>::iterator I = Protocols.begin(),
640       E = Protocols.end(); I != E; ++I)
641    CheckProtocolMethodDefs(IMPDecl->getLocation(), *I,
642                            IncompleteImpl, InsMap, ClsMap);
643}
644
645/// ImplCategoryMethodsVsIntfMethods - Checks that methods declared in the
646/// category interface is implemented in the category @implementation.
647void Sema::ImplCategoryMethodsVsIntfMethods(ObjCCategoryImplDecl *CatImplDecl,
648                                            ObjCCategoryDecl *CatClassDecl) {
649  llvm::DenseSet<Selector> InsMap;
650  // Check and see if instance methods in category interface have been
651  // implemented in its implementation class.
652  for (ObjCCategoryImplDecl::instmeth_iterator I =CatImplDecl->instmeth_begin(),
653       E = CatImplDecl->instmeth_end(); I != E; ++I)
654    InsMap.insert((*I)->getSelector());
655
656  bool IncompleteImpl = false;
657  for (ObjCCategoryDecl::instmeth_iterator I = CatClassDecl->instmeth_begin(),
658       E = CatClassDecl->instmeth_end(); I != E; ++I)
659    if (!InsMap.count((*I)->getSelector()))
660      WarnUndefinedMethod(CatImplDecl->getLocation(), *I, IncompleteImpl);
661
662  llvm::DenseSet<Selector> ClsMap;
663  // Check and see if class methods in category interface have been
664  // implemented in its implementation class.
665  for (ObjCCategoryImplDecl::classmeth_iterator
666       I = CatImplDecl->classmeth_begin(), E = CatImplDecl->classmeth_end();
667       I != E; ++I)
668    ClsMap.insert((*I)->getSelector());
669
670  for (ObjCCategoryDecl::classmeth_iterator I = CatClassDecl->classmeth_begin(),
671       E = CatClassDecl->classmeth_end(); I != E; ++I)
672    if (!ClsMap.count((*I)->getSelector()))
673      WarnUndefinedMethod(CatImplDecl->getLocation(), *I, IncompleteImpl);
674
675  // Check the protocol list for unimplemented methods in the @implementation
676  // class.
677  for (ObjCCategoryDecl::protocol_iterator PI = CatClassDecl->protocol_begin(),
678       E = CatClassDecl->protocol_end(); PI != E; ++PI)
679    CheckProtocolMethodDefs(CatImplDecl->getLocation(), *PI, IncompleteImpl,
680                            InsMap, ClsMap);
681}
682
683/// ActOnForwardClassDeclaration -
684Action::DeclTy *
685Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc,
686                                   IdentifierInfo **IdentList, unsigned NumElts)
687{
688  llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces;
689
690  for (unsigned i = 0; i != NumElts; ++i) {
691    // Check for another declaration kind with the same name.
692    Decl *PrevDecl = LookupDecl(IdentList[i], Decl::IDNS_Ordinary, TUScope);
693    if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
694      // GCC apparently allows the following idiom:
695      //
696      // typedef NSObject < XCElementTogglerP > XCElementToggler;
697      // @class XCElementToggler;
698      //
699      // FIXME: Make an extension?
700      TypedefDecl *TDD = dyn_cast<TypedefDecl>(PrevDecl);
701      if (!TDD || !isa<ObjCInterfaceType>(TDD->getUnderlyingType())) {
702        Diag(AtClassLoc, diag::err_redefinition_different_kind,
703             IdentList[i]->getName());
704        Diag(PrevDecl->getLocation(), diag::err_previous_definition);
705      }
706    }
707    ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
708    if (!IDecl) {  // Not already seen?  Make a forward decl.
709      IDecl = ObjCInterfaceDecl::Create(Context, AtClassLoc, IdentList[i],
710                                        SourceLocation(), true);
711      ObjCInterfaceDecls[IdentList[i]] = IDecl;
712
713      // Remember that this needs to be removed when the scope is popped.
714      TUScope->AddDecl(IDecl);
715    }
716
717    Interfaces.push_back(IDecl);
718  }
719
720  return ObjCClassDecl::Create(Context, AtClassLoc,
721                               &Interfaces[0], Interfaces.size());
722}
723
724
725/// MatchTwoMethodDeclarations - Checks that two methods have matching type and
726/// returns true, or false, accordingly.
727/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons
728bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
729                                      const ObjCMethodDecl *PrevMethod) {
730  if (Method->getResultType().getCanonicalType() !=
731      PrevMethod->getResultType().getCanonicalType())
732    return false;
733  for (unsigned i = 0, e = Method->getNumParams(); i != e; ++i) {
734    ParmVarDecl *ParamDecl = Method->getParamDecl(i);
735    ParmVarDecl *PrevParamDecl = PrevMethod->getParamDecl(i);
736    if (Context.getCanonicalType(ParamDecl->getType()) !=
737        Context.getCanonicalType(PrevParamDecl->getType()))
738      return false;
739  }
740  return true;
741}
742
743void Sema::AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method) {
744  ObjCMethodList &FirstMethod = InstanceMethodPool[Method->getSelector()];
745  if (!FirstMethod.Method) {
746    // Haven't seen a method with this selector name yet - add it.
747    FirstMethod.Method = Method;
748    FirstMethod.Next = 0;
749  } else {
750    // We've seen a method with this name, now check the type signature(s).
751    bool match = MatchTwoMethodDeclarations(Method, FirstMethod.Method);
752
753    for (ObjCMethodList *Next = FirstMethod.Next; !match && Next;
754         Next = Next->Next)
755      match = MatchTwoMethodDeclarations(Method, Next->Method);
756
757    if (!match) {
758      // We have a new signature for an existing method - add it.
759      // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
760      struct ObjCMethodList *OMI = new ObjCMethodList(Method, FirstMethod.Next);
761      FirstMethod.Next = OMI;
762    }
763  }
764}
765
766void Sema::AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method) {
767  ObjCMethodList &FirstMethod = FactoryMethodPool[Method->getSelector()];
768  if (!FirstMethod.Method) {
769    // Haven't seen a method with this selector name yet - add it.
770    FirstMethod.Method = Method;
771    FirstMethod.Next = 0;
772  } else {
773    // We've seen a method with this name, now check the type signature(s).
774    bool match = MatchTwoMethodDeclarations(Method, FirstMethod.Method);
775
776    for (ObjCMethodList *Next = FirstMethod.Next; !match && Next;
777         Next = Next->Next)
778      match = MatchTwoMethodDeclarations(Method, Next->Method);
779
780    if (!match) {
781      // We have a new signature for an existing method - add it.
782      // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
783      struct ObjCMethodList *OMI = new ObjCMethodList(Method, FirstMethod.Next);
784      FirstMethod.Next = OMI;
785    }
786  }
787}
788
789// Note: For class/category implemenations, allMethods/allProperties is
790// always null.
791void Sema::ActOnAtEnd(SourceLocation AtEndLoc, DeclTy *classDecl,
792                      DeclTy **allMethods, unsigned allNum,
793                      DeclTy **allProperties, unsigned pNum) {
794  Decl *ClassDecl = static_cast<Decl *>(classDecl);
795
796  // FIXME: If we don't have a ClassDecl, we have an error. We should consider
797  // always passing in a decl. If the decl has an error, isInvalidDecl()
798  // should be true.
799  if (!ClassDecl)
800    return;
801
802  llvm::SmallVector<ObjCMethodDecl*, 32> insMethods;
803  llvm::SmallVector<ObjCMethodDecl*, 16> clsMethods;
804
805  llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap;
806  llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap;
807
808  bool isInterfaceDeclKind =
809        isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl)
810         || isa<ObjCProtocolDecl>(ClassDecl);
811  bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl);
812
813  if (pNum != 0) {
814    if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(ClassDecl))
815      IDecl->addProperties((ObjCPropertyDecl**)allProperties, pNum);
816    else if (ObjCCategoryDecl *CDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl))
817      CDecl->addProperties((ObjCPropertyDecl**)allProperties, pNum);
818    else if (ObjCProtocolDecl *PDecl = dyn_cast<ObjCProtocolDecl>(ClassDecl))
819          PDecl->addProperties((ObjCPropertyDecl**)allProperties, pNum);
820    else
821      assert(false && "ActOnAtEnd - property declaration misplaced");
822  }
823
824  for (unsigned i = 0; i < allNum; i++ ) {
825    ObjCMethodDecl *Method =
826      cast_or_null<ObjCMethodDecl>(static_cast<Decl*>(allMethods[i]));
827
828    if (!Method) continue;  // Already issued a diagnostic.
829    if (Method->isInstance()) {
830      /// Check for instance method of the same name with incompatible types
831      const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()];
832      bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
833                              : false;
834      if (isInterfaceDeclKind && PrevMethod && !match
835          || checkIdenticalMethods && match) {
836          Diag(Method->getLocation(), diag::error_duplicate_method_decl,
837               Method->getSelector().getName());
838          Diag(PrevMethod->getLocation(), diag::err_previous_declaration);
839      } else {
840        insMethods.push_back(Method);
841        InsMap[Method->getSelector()] = Method;
842        /// The following allows us to typecheck messages to "id".
843        AddInstanceMethodToGlobalPool(Method);
844      }
845    }
846    else {
847      /// Check for class method of the same name with incompatible types
848      const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()];
849      bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
850                              : false;
851      if (isInterfaceDeclKind && PrevMethod && !match
852          || checkIdenticalMethods && match) {
853        Diag(Method->getLocation(), diag::error_duplicate_method_decl,
854             Method->getSelector().getName());
855        Diag(PrevMethod->getLocation(), diag::err_previous_declaration);
856      } else {
857        clsMethods.push_back(Method);
858        ClsMap[Method->getSelector()] = Method;
859        /// The following allows us to typecheck messages to "Class".
860        AddFactoryMethodToGlobalPool(Method);
861      }
862    }
863  }
864
865  if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
866    // Compares properties declaraed in this class to those of its
867    // super class.
868    ComparePropertiesInBaseAndSuper(I);
869    MergeProtocolPropertiesIntoClass(I, I);
870    for (ObjCInterfaceDecl::classprop_iterator P = I->classprop_begin(),
871         E = I->classprop_end(); P != E; ++P) {
872      // FIXME: It would be really nice if we could avoid this. Injecting
873      // methods into the interface makes it hard to distinguish "real" methods
874      // from synthesized "property" methods (that aren't in the source).
875      // This complicicates the rewriter's life.
876      I->addPropertyMethods(Context, *P, insMethods);
877    }
878    I->addMethods(&insMethods[0], insMethods.size(),
879                  &clsMethods[0], clsMethods.size(), AtEndLoc);
880
881  } else if (ObjCProtocolDecl *P = dyn_cast<ObjCProtocolDecl>(ClassDecl)) {
882    P->addMethods(&insMethods[0], insMethods.size(),
883                  &clsMethods[0], clsMethods.size(), AtEndLoc);
884  }
885  else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
886    C->addMethods(&insMethods[0], insMethods.size(),
887                  &clsMethods[0], clsMethods.size(), AtEndLoc);
888  }
889  else if (ObjCImplementationDecl *IC =
890                dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
891    IC->setLocEnd(AtEndLoc);
892    if (ObjCInterfaceDecl* IDecl = getObjCInterfaceDecl(IC->getIdentifier()))
893      ImplMethodsVsClassMethods(IC, IDecl);
894  } else {
895    ObjCCategoryImplDecl* CatImplClass = cast<ObjCCategoryImplDecl>(ClassDecl);
896    CatImplClass->setLocEnd(AtEndLoc);
897    ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface();
898    // Find category interface decl and then check that all methods declared
899    // in this interface is implemented in the category @implementation.
900    if (IDecl) {
901      for (ObjCCategoryDecl *Categories = IDecl->getCategoryList();
902           Categories; Categories = Categories->getNextClassCategory()) {
903        if (Categories->getIdentifier() == CatImplClass->getIdentifier()) {
904          ImplCategoryMethodsVsIntfMethods(CatImplClass, Categories);
905          break;
906        }
907      }
908    }
909  }
910}
911
912
913/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for
914/// objective-c's type qualifier from the parser version of the same info.
915static Decl::ObjCDeclQualifier
916CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) {
917  Decl::ObjCDeclQualifier ret = Decl::OBJC_TQ_None;
918  if (PQTVal & ObjCDeclSpec::DQ_In)
919    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_In);
920  if (PQTVal & ObjCDeclSpec::DQ_Inout)
921    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Inout);
922  if (PQTVal & ObjCDeclSpec::DQ_Out)
923    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Out);
924  if (PQTVal & ObjCDeclSpec::DQ_Bycopy)
925    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Bycopy);
926  if (PQTVal & ObjCDeclSpec::DQ_Byref)
927    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Byref);
928  if (PQTVal & ObjCDeclSpec::DQ_Oneway)
929    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Oneway);
930
931  return ret;
932}
933
934Sema::DeclTy *Sema::ActOnMethodDeclaration(
935    SourceLocation MethodLoc, SourceLocation EndLoc,
936    tok::TokenKind MethodType, DeclTy *classDecl,
937    ObjCDeclSpec &ReturnQT, TypeTy *ReturnType,
938    Selector Sel,
939    // optional arguments. The number of types/arguments is obtained
940    // from the Sel.getNumArgs().
941    ObjCDeclSpec *ArgQT, TypeTy **ArgTypes, IdentifierInfo **ArgNames,
942    AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind,
943    bool isVariadic) {
944  Decl *ClassDecl = static_cast<Decl*>(classDecl);
945
946  // Make sure we can establish a context for the method.
947  if (!ClassDecl) {
948    Diag(MethodLoc, diag::error_missing_method_context);
949    return 0;
950  }
951  QualType resultDeclType;
952
953  if (ReturnType)
954    resultDeclType = QualType::getFromOpaquePtr(ReturnType);
955  else // get the type for "id".
956    resultDeclType = Context.getObjCIdType();
957
958  ObjCMethodDecl* ObjCMethod =
959    ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType,
960                           ClassDecl, AttrList,
961                           MethodType == tok::minus, isVariadic,
962                           false,
963                           MethodDeclKind == tok::objc_optional ?
964                           ObjCMethodDecl::Optional :
965                           ObjCMethodDecl::Required);
966
967  llvm::SmallVector<ParmVarDecl*, 16> Params;
968
969  for (unsigned i = 0; i < Sel.getNumArgs(); i++) {
970    // FIXME: arg->AttrList must be stored too!
971    QualType argType;
972
973    if (ArgTypes[i])
974      argType = QualType::getFromOpaquePtr(ArgTypes[i]);
975    else
976      argType = Context.getObjCIdType();
977    ParmVarDecl* Param = ParmVarDecl::Create(Context, ObjCMethod,
978                                             SourceLocation(/*FIXME*/),
979                                             ArgNames[i], argType,
980                                             VarDecl::None, 0, 0);
981    Param->setObjCDeclQualifier(
982      CvtQTToAstBitMask(ArgQT[i].getObjCDeclQualifier()));
983    Params.push_back(Param);
984  }
985
986  ObjCMethod->setMethodParams(&Params[0], Sel.getNumArgs());
987  ObjCMethod->setObjCDeclQualifier(
988    CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier()));
989  const ObjCMethodDecl *PrevMethod = 0;
990
991  // For implementations (which can be very "coarse grain"), we add the
992  // method now. This allows the AST to implement lookup methods that work
993  // incrementally (without waiting until we parse the @end). It also allows
994  // us to flag multiple declaration errors as they occur.
995  if (ObjCImplementationDecl *ImpDecl =
996        dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
997    if (MethodType == tok::minus) {
998      PrevMethod = ImpDecl->getInstanceMethod(Sel);
999      ImpDecl->addInstanceMethod(ObjCMethod);
1000    } else {
1001      PrevMethod = ImpDecl->getClassMethod(Sel);
1002      ImpDecl->addClassMethod(ObjCMethod);
1003    }
1004  }
1005  else if (ObjCCategoryImplDecl *CatImpDecl =
1006            dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) {
1007    if (MethodType == tok::minus) {
1008      PrevMethod = CatImpDecl->getInstanceMethod(Sel);
1009      CatImpDecl->addInstanceMethod(ObjCMethod);
1010    } else {
1011      PrevMethod = CatImpDecl->getClassMethod(Sel);
1012      CatImpDecl->addClassMethod(ObjCMethod);
1013    }
1014  }
1015  if (PrevMethod) {
1016    // You can never have two method definitions with the same name.
1017    Diag(ObjCMethod->getLocation(), diag::error_duplicate_method_decl,
1018        ObjCMethod->getSelector().getName());
1019    Diag(PrevMethod->getLocation(), diag::err_previous_declaration);
1020  }
1021  return ObjCMethod;
1022}
1023
1024Sema::DeclTy *Sema::ActOnProperty(Scope *S, SourceLocation AtLoc,
1025                                  FieldDeclarator &FD,
1026                                  ObjCDeclSpec &ODS,
1027                                  Selector GetterSel,
1028                                  Selector SetterSel,
1029                                  tok::ObjCKeywordKind MethodImplKind) {
1030  QualType T = GetTypeForDeclarator(FD.D, S);
1031  ObjCPropertyDecl *PDecl = ObjCPropertyDecl::Create(Context, AtLoc,
1032                                                     FD.D.getIdentifier(), T);
1033  // Regardless of setter/getter attribute, we save the default getter/setter
1034  // selector names in anticipation of declaration of setter/getter methods.
1035  PDecl->setGetterName(GetterSel);
1036  PDecl->setSetterName(SetterSel);
1037
1038  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_readonly)
1039    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readonly);
1040
1041  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_getter)
1042    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_getter);
1043
1044  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_setter)
1045    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_setter);
1046
1047  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_assign)
1048    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign);
1049
1050  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_readwrite)
1051    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readwrite);
1052
1053  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_retain)
1054    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain);
1055
1056  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_copy)
1057    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy);
1058
1059  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_nonatomic)
1060    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_nonatomic);
1061
1062  if (MethodImplKind == tok::objc_required)
1063    PDecl->setPropertyImplementation(ObjCPropertyDecl::Required);
1064  else if (MethodImplKind == tok::objc_optional)
1065    PDecl->setPropertyImplementation(ObjCPropertyDecl::Optional);
1066
1067  return PDecl;
1068}
1069
1070/// ActOnPropertyImplDecl - This routine performs semantic checks and
1071/// builds the AST node for a property implementation declaration; declared
1072/// as @synthesize or @dynamic.
1073///
1074Sema::DeclTy *Sema::ActOnPropertyImplDecl(SourceLocation AtLoc,
1075                                          SourceLocation PropertyLoc,
1076                                          bool Synthesize,
1077                                          DeclTy *ClassCatImpDecl,
1078                                          IdentifierInfo *PropertyId,
1079                                          IdentifierInfo *PropertyIvar) {
1080  Decl *ClassImpDecl = static_cast<Decl*>(ClassCatImpDecl);
1081  // Make sure we have a context for the property implementation declaration.
1082  if (!ClassImpDecl) {
1083    Diag(AtLoc, diag::error_missing_property_context);
1084    return 0;
1085  }
1086  ObjCPropertyDecl *property = 0;
1087  ObjCInterfaceDecl* IDecl = 0;
1088  // Find the class or category class where this property must have
1089  // a declaration.
1090  ObjCImplementationDecl *IC = 0;
1091  ObjCCategoryImplDecl* CatImplClass = 0;
1092  if ((IC = dyn_cast<ObjCImplementationDecl>(ClassImpDecl))) {
1093    IDecl = getObjCInterfaceDecl(IC->getIdentifier());
1094    // We always synthesize an interface for an implementation
1095    // without an interface decl. So, IDecl is always non-zero.
1096    assert(IDecl &&
1097           "ActOnPropertyImplDecl - @implementation without @interface");
1098
1099    // Look for this property declaration in the @implementation's @interface
1100    property = IDecl->FindPropertyDeclaration(PropertyId);
1101    if (!property) {
1102       Diag(PropertyLoc, diag::error_bad_property_decl, IDecl->getName());
1103      return 0;
1104    }
1105  }
1106  else if ((CatImplClass = dyn_cast<ObjCCategoryImplDecl>(ClassImpDecl))) {
1107    if (Synthesize) {
1108      Diag(AtLoc, diag::error_synthesize_category_decl);
1109      return 0;
1110    }
1111    IDecl = CatImplClass->getClassInterface();
1112    if (!IDecl) {
1113      Diag(AtLoc, diag::error_missing_property_interface);
1114      return 0;
1115    }
1116    ObjCCategoryDecl *Category =
1117      IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier());
1118
1119    // If category for this implementation not found, it is an error which
1120    // has already been reported eralier.
1121    if (!Category)
1122      return 0;
1123    // Look for this property declaration in @implementation's category
1124    property = Category->FindPropertyDeclaration(PropertyId);
1125    if (!property) {
1126      Diag(PropertyLoc, diag::error_bad_category_property_decl,
1127           Category->getName());
1128      return 0;
1129    }
1130  }
1131  else {
1132    Diag(AtLoc, diag::error_bad_property_context);
1133    return 0;
1134  }
1135  ObjCIvarDecl *Ivar = 0;
1136  // Check that we have a valid, previously declared ivar for @synthesize
1137  if (Synthesize) {
1138    // @synthesize
1139    if (!PropertyIvar)
1140      PropertyIvar = PropertyId;
1141    // Check that this is a previously declared 'ivar' in 'IDecl' interface
1142    Ivar = IDecl->FindIvarDeclaration(PropertyIvar);
1143    if (!Ivar) {
1144      Diag(PropertyLoc, diag::error_missing_property_ivar_decl,
1145           PropertyId->getName());
1146      return 0;
1147    }
1148    // Check that type of property and its ivar match.
1149    if (Context.getCanonicalType(Ivar->getType()) !=
1150        Context.getCanonicalType(property->getType())) {
1151      Diag(PropertyLoc, diag::error_property_ivar_type, property->getName(),
1152           Ivar->getName());
1153      return 0;
1154    }
1155
1156  } else if (PropertyIvar) {
1157    // @dynamic
1158    Diag(PropertyLoc, diag::error_dynamic_property_ivar_decl);
1159    return 0;
1160  }
1161  assert (property && "ActOnPropertyImplDecl - property declaration missing");
1162  ObjCPropertyImplDecl *PIDecl =
1163    ObjCPropertyImplDecl::Create(Context, AtLoc, PropertyLoc, property,
1164                                 (Synthesize ?
1165                                  ObjCPropertyImplDecl::OBJC_PR_IMPL_SYNTHSIZE
1166                                  : ObjCPropertyImplDecl::OBJC_PR_IMPL_DYNAMIC),
1167                                  Ivar);
1168  if (IC)
1169    IC->addPropertyImplementation(PIDecl);
1170  else
1171    CatImplClass->addPropertyImplementation(PIDecl);
1172
1173  return PIDecl;
1174}
1175