SemaDeclObjC.cpp revision b752f289026ad8e5f44851b20e009a27ed61eefc 
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<ObjCMethodDecl>(static_cast<Decl *>(D));
26  assert(MDecl != 0 && "Not a method declarator!");
27
28  // Allow the rest of sema to find private method decl implementations.
29  if (MDecl->isInstance())
30    AddInstanceMethodToGlobalPool(MDecl);
31  else
32    AddFactoryMethodToGlobalPool(MDecl);
33
34  // Allow all of Sema to see that we are entering a method definition.
35  PushDeclContext(MDecl);
36
37  // Create Decl objects for each parameter, entrring them in the scope for
38  // binding to their use.
39  struct DeclaratorChunk::ParamInfo PI;
40
41  // Insert the invisible arguments, self and _cmd!
42  PI.Ident = &Context.Idents.get("self");
43  PI.IdentLoc = SourceLocation(); // synthesized vars have a null location.
44  QualType selfTy;
45  if (MDecl->isInstance()) {
46    selfTy = Context.getObjCIdType();
47    if (ObjCInterfaceDecl *OID = MDecl->getClassInterface()) {
48      // There may be no interface context due to error in declaration of the
49      // interface (which has been reported). Recover gracefully
50      selfTy = Context.getObjCInterfaceType(OID);
51      selfTy = Context.getPointerType(selfTy);
52    }
53  } else // we have a factory method.
54    selfTy = Context.getObjCClassType();
55  getCurMethodDecl()->setSelfDecl(CreateImplicitParameter(FnBodyScope,
56        PI.Ident, PI.IdentLoc, selfTy));
57
58  PI.Ident = &Context.Idents.get("_cmd");
59  getCurMethodDecl()->setCmdDecl(CreateImplicitParameter(FnBodyScope,
60        PI.Ident, PI.IdentLoc, Context.getObjCSelType()));
61
62  // Introduce all of the other parameters into this scope.
63  for (unsigned i = 0, e = MDecl->getNumParams(); i != e; ++i) {
64    ParmVarDecl *PDecl = MDecl->getParamDecl(i);
65    IdentifierInfo *II = PDecl->getIdentifier();
66    if (II)
67      PushOnScopeChains(PDecl, FnBodyScope);
68  }
69}
70
71Sema::DeclTy *Sema::ActOnStartClassInterface(
72                    SourceLocation AtInterfaceLoc,
73                    IdentifierInfo *ClassName, SourceLocation ClassLoc,
74                    IdentifierInfo *SuperName, SourceLocation SuperLoc,
75                    IdentifierInfo **ProtocolNames, unsigned NumProtocols,
76                    SourceLocation EndProtoLoc, AttributeList *AttrList) {
77  assert(ClassName && "Missing class identifier");
78
79  // Check for another declaration kind with the same name.
80  Decl *PrevDecl = LookupDecl(ClassName, Decl::IDNS_Ordinary, TUScope);
81  if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
82    Diag(ClassLoc, diag::err_redefinition_different_kind,
83         ClassName->getName());
84    Diag(PrevDecl->getLocation(), diag::err_previous_definition);
85  }
86
87  ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
88  if (IDecl) {
89    // Class already seen. Is it a forward declaration?
90    if (!IDecl->isForwardDecl())
91      Diag(AtInterfaceLoc, diag::err_duplicate_class_def, IDecl->getName());
92    else {
93      IDecl->setLocation(AtInterfaceLoc);
94      IDecl->setForwardDecl(false);
95    }
96  } else {
97    IDecl = ObjCInterfaceDecl::Create(Context, AtInterfaceLoc,
98                                      ClassName, ClassLoc);
99
100    ObjCInterfaceDecls[ClassName] = IDecl;
101    // Remember that this needs to be removed when the scope is popped.
102    TUScope->AddDecl(IDecl);
103  }
104
105  if (SuperName) {
106    ObjCInterfaceDecl* SuperClassEntry = 0;
107    // Check if a different kind of symbol declared in this scope.
108    PrevDecl = LookupDecl(SuperName, Decl::IDNS_Ordinary, TUScope);
109    if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
110      Diag(SuperLoc, diag::err_redefinition_different_kind,
111           SuperName->getName());
112      Diag(PrevDecl->getLocation(), diag::err_previous_definition);
113    }
114    else {
115      // Check that super class is previously defined
116      SuperClassEntry = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
117
118      if (!SuperClassEntry || SuperClassEntry->isForwardDecl()) {
119        Diag(SuperLoc, diag::err_undef_superclass,
120             SuperClassEntry ? SuperClassEntry->getName()
121                             : SuperName->getName(),
122             ClassName->getName(), SourceRange(AtInterfaceLoc, ClassLoc));
123      }
124    }
125    IDecl->setSuperClass(SuperClassEntry);
126    IDecl->setSuperClassLoc(SuperLoc);
127    IDecl->setLocEnd(SuperLoc);
128  } else { // we have a root class.
129    IDecl->setLocEnd(ClassLoc);
130  }
131
132  /// Check then save referenced protocols
133  if (NumProtocols) {
134    llvm::SmallVector<ObjCProtocolDecl*, 8> RefProtos;
135    for (unsigned int i = 0; i != NumProtocols; i++) {
136      ObjCProtocolDecl* RefPDecl = ObjCProtocols[ProtocolNames[i]];
137      if (!RefPDecl || RefPDecl->isForwardDecl())
138        Diag(EndProtoLoc, diag::warn_undef_protocolref,
139             ProtocolNames[i]->getName(),
140             ClassName->getName());
141      else
142        RefProtos.push_back(RefPDecl);
143    }
144    if (!RefProtos.empty())
145      IDecl->addReferencedProtocols(&RefProtos[0], RefProtos.size());
146    IDecl->setLocEnd(EndProtoLoc);
147  }
148  return IDecl;
149}
150
151/// ActOnCompatiblityAlias - this action is called after complete parsing of
152/// @compaatibility_alias declaration. It sets up the alias relationships.
153Sema::DeclTy *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc,
154                                           IdentifierInfo *AliasName,
155                                           SourceLocation AliasLocation,
156                                           IdentifierInfo *ClassName,
157                                           SourceLocation ClassLocation) {
158  // Look for previous declaration of alias name
159  Decl *ADecl = LookupDecl(AliasName, Decl::IDNS_Ordinary, TUScope);
160  if (ADecl) {
161    if (isa<ObjCCompatibleAliasDecl>(ADecl)) {
162      Diag(AliasLocation, diag::warn_previous_alias_decl);
163      Diag(ADecl->getLocation(), diag::warn_previous_declaration);
164    }
165    else {
166      Diag(AliasLocation, diag::err_conflicting_aliasing_type,
167           AliasName->getName());
168      Diag(ADecl->getLocation(), diag::err_previous_declaration);
169    }
170    return 0;
171  }
172  // Check for class declaration
173  Decl *CDeclU = LookupDecl(ClassName, Decl::IDNS_Ordinary, TUScope);
174  ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU);
175  if (CDecl == 0) {
176    Diag(ClassLocation, diag::warn_undef_interface, ClassName->getName());
177    if (CDeclU)
178      Diag(CDeclU->getLocation(), diag::warn_previous_declaration);
179    return 0;
180  }
181
182  // Everything checked out, instantiate a new alias declaration AST.
183  ObjCCompatibleAliasDecl *AliasDecl =
184    ObjCCompatibleAliasDecl::Create(Context, AtLoc, AliasName, CDecl);
185
186  ObjCAliasDecls[AliasName] = AliasDecl;
187  TUScope->AddDecl(AliasDecl);
188  return AliasDecl;
189}
190
191Sema::DeclTy *Sema::ActOnStartProtocolInterface(
192                SourceLocation AtProtoInterfaceLoc,
193                IdentifierInfo *ProtocolName, SourceLocation ProtocolLoc,
194                IdentifierInfo **ProtoRefNames, unsigned NumProtoRefs,
195                SourceLocation EndProtoLoc) {
196  assert(ProtocolName && "Missing protocol identifier");
197  ObjCProtocolDecl *PDecl = ObjCProtocols[ProtocolName];
198  if (PDecl) {
199    // Protocol already seen. Better be a forward protocol declaration
200    if (!PDecl->isForwardDecl()) {
201      Diag(ProtocolLoc, diag::err_duplicate_protocol_def,
202           ProtocolName->getName());
203      // Just return the protocol we already had.
204      // FIXME: don't leak the objects passed in!
205      return PDecl;
206    }
207
208    PDecl->setForwardDecl(false);
209    PDecl->AllocReferencedProtocols(NumProtoRefs);
210  } else {
211    PDecl = ObjCProtocolDecl::Create(Context, AtProtoInterfaceLoc, NumProtoRefs,
212                                     ProtocolName);
213    PDecl->setForwardDecl(false);
214    ObjCProtocols[ProtocolName] = PDecl;
215  }
216
217  if (NumProtoRefs) {
218    /// Check then save referenced protocols.
219    for (unsigned int i = 0; i != NumProtoRefs; i++) {
220      ObjCProtocolDecl* RefPDecl = ObjCProtocols[ProtoRefNames[i]];
221      if (!RefPDecl || RefPDecl->isForwardDecl())
222        Diag(ProtocolLoc, diag::warn_undef_protocolref,
223             ProtoRefNames[i]->getName(),
224             ProtocolName->getName());
225      PDecl->setReferencedProtocols(i, RefPDecl);
226    }
227    PDecl->setLocEnd(EndProtoLoc);
228  }
229  return PDecl;
230}
231
232/// FindProtocolDeclaration - This routine looks up protocols and
233/// issuer error if they are not declared. It returns list of protocol
234/// declarations in its 'Protocols' argument.
235void
236Sema::FindProtocolDeclaration(SourceLocation TypeLoc,
237                              IdentifierInfo **ProtocolId,
238                              unsigned NumProtocols,
239                              llvm::SmallVector<DeclTy *,8> &Protocols) {
240  for (unsigned i = 0; i != NumProtocols; ++i) {
241    ObjCProtocolDecl *PDecl = ObjCProtocols[ProtocolId[i]];
242    if (!PDecl)
243      Diag(TypeLoc, diag::err_undeclared_protocol,
244           ProtocolId[i]->getName());
245    else
246      Protocols.push_back(PDecl);
247  }
248}
249
250/// DiagnosePropertyMismatch - Compares two properties for their
251/// attributes and types and warns on a variety of inconsistancies.
252///
253void
254Sema::DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
255                               ObjCPropertyDecl *SuperProperty,
256                               const char *inheritedName) {
257  ObjCPropertyDecl::PropertyAttributeKind CAttr =
258  Property->getPropertyAttributes();
259  ObjCPropertyDecl::PropertyAttributeKind SAttr =
260  SuperProperty->getPropertyAttributes();
261  if ((CAttr & ObjCPropertyDecl::OBJC_PR_readonly)
262      && (SAttr & ObjCPropertyDecl::OBJC_PR_readwrite))
263    Diag(Property->getLocation(), diag::warn_readonly_property,
264               Property->getName(), inheritedName);
265  if ((CAttr & ObjCPropertyDecl::OBJC_PR_copy)
266      != (SAttr & ObjCPropertyDecl::OBJC_PR_copy))
267    Diag(Property->getLocation(), diag::warn_property_attribute,
268         Property->getName(), "copy", inheritedName,
269         SourceRange());
270  else if ((CAttr & ObjCPropertyDecl::OBJC_PR_retain)
271           != (SAttr & ObjCPropertyDecl::OBJC_PR_retain))
272    Diag(Property->getLocation(), diag::warn_property_attribute,
273         Property->getName(), "retain", inheritedName,
274         SourceRange());
275
276  if ((CAttr & ObjCPropertyDecl::OBJC_PR_nonatomic)
277      != (SAttr & ObjCPropertyDecl::OBJC_PR_nonatomic))
278    Diag(Property->getLocation(), diag::warn_property_attribute,
279         Property->getName(), "atomic", inheritedName,
280         SourceRange());
281  if (Property->getSetterName() != SuperProperty->getSetterName())
282    Diag(Property->getLocation(), diag::warn_property_attribute,
283         Property->getName(), "setter", inheritedName,
284         SourceRange());
285  if (Property->getGetterName() != SuperProperty->getGetterName())
286    Diag(Property->getLocation(), diag::warn_property_attribute,
287         Property->getName(), "getter", inheritedName,
288         SourceRange());
289
290  if (Property->getCanonicalType() != SuperProperty->getCanonicalType())
291    Diag(Property->getLocation(), diag::warn_property_type,
292         Property->getType().getAsString(),
293         inheritedName);
294
295}
296
297/// ComparePropertiesInBaseAndSuper - This routine compares property
298/// declarations in base and its super class, if any, and issues
299/// diagnostics in a variety of inconsistant situations.
300///
301void
302Sema::ComparePropertiesInBaseAndSuper(ObjCInterfaceDecl *IDecl) {
303  ObjCInterfaceDecl *SDecl = IDecl->getSuperClass();
304  if (!SDecl)
305    return;
306  for (ObjCInterfaceDecl::classprop_iterator S = SDecl->classprop_begin(),
307       E = SDecl->classprop_end(); S != E; ++S) {
308    ObjCPropertyDecl *SuperPDecl = (*S);
309    // Does property in super class has declaration in current class?
310    for (ObjCInterfaceDecl::classprop_iterator I = IDecl->classprop_begin(),
311         E = IDecl->classprop_end(); I != E; ++I) {
312      ObjCPropertyDecl *PDecl = (*I);
313      if (SuperPDecl->getIdentifier() == PDecl->getIdentifier())
314          DiagnosePropertyMismatch(PDecl, SuperPDecl, SDecl->getName());
315    }
316  }
317}
318
319/// MergeOneProtocolPropertiesIntoClass - This routine goes thru the list
320/// of properties declared in a protocol and adds them to the list
321/// of properties for current class if it is not there already.
322void
323Sema::MergeOneProtocolPropertiesIntoClass(ObjCInterfaceDecl *IDecl,
324                                          ObjCProtocolDecl *PDecl)
325{
326  llvm::SmallVector<ObjCPropertyDecl*, 16> mergeProperties;
327  for (ObjCProtocolDecl::classprop_iterator P = PDecl->classprop_begin(),
328       E = PDecl->classprop_end(); P != E; ++P) {
329    ObjCPropertyDecl *Pr = (*P);
330    ObjCInterfaceDecl::classprop_iterator CP, CE;
331    // Is this property already in  class's list of properties?
332    for (CP = IDecl->classprop_begin(), CE = IDecl->classprop_end();
333         CP != CE; ++CP)
334      if ((*CP)->getIdentifier() == Pr->getIdentifier())
335        break;
336    if (CP == CE)
337      // Add this property to list of properties for thie class.
338      mergeProperties.push_back(Pr);
339    else
340      // Property protocol already exist in class. Diagnose any mismatch.
341      DiagnosePropertyMismatch((*CP), Pr, PDecl->getName());
342    }
343  IDecl->mergeProperties(&mergeProperties[0], mergeProperties.size());
344}
345
346/// MergeProtocolPropertiesIntoClass - This routine merges properties
347/// declared in 'MergeItsProtocols' objects (which can be a class or an
348/// inherited protocol into the list of properties for class 'IDecl'
349///
350
351void
352Sema::MergeProtocolPropertiesIntoClass(ObjCInterfaceDecl *IDecl,
353                                       DeclTy *MergeItsProtocols) {
354  Decl *ClassDecl = static_cast<Decl *>(MergeItsProtocols);
355  if (ObjCInterfaceDecl *MDecl = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
356    for (ObjCInterfaceDecl::protocol_iterator P = MDecl->protocol_begin(),
357         E = MDecl->protocol_end(); P != E; ++P)
358      // Merge properties of class (*P) into IDECL's
359      MergeOneProtocolPropertiesIntoClass(IDecl, *P);
360
361    // Go thru the list of protocols for this class and recursively merge
362    // their properties into this class as well.
363    for (ObjCInterfaceDecl::protocol_iterator P = IDecl->protocol_begin(),
364         E = IDecl->protocol_end(); P != E; ++P)
365      MergeProtocolPropertiesIntoClass(IDecl, *P);
366  } else {
367    ObjCProtocolDecl *MDecl = cast<ObjCProtocolDecl>(ClassDecl);
368    for (ObjCProtocolDecl::protocol_iterator P = MDecl->protocol_begin(),
369         E = MDecl->protocol_end(); P != E; ++P)
370      MergeOneProtocolPropertiesIntoClass(IDecl, (*P));
371  }
372}
373
374/// ActOnForwardProtocolDeclaration -
375Action::DeclTy *
376Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc,
377        IdentifierInfo **IdentList, unsigned NumElts) {
378  llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols;
379
380  for (unsigned i = 0; i != NumElts; ++i) {
381    IdentifierInfo *Ident = IdentList[i];
382    ObjCProtocolDecl *&PDecl = ObjCProtocols[Ident];
383    if (PDecl == 0)  { // Not already seen?
384      // FIXME: Pass in the location of the identifier!
385      PDecl = ObjCProtocolDecl::Create(Context, AtProtocolLoc, 0, Ident);
386    }
387
388    Protocols.push_back(PDecl);
389  }
390  return ObjCForwardProtocolDecl::Create(Context, AtProtocolLoc,
391                                         &Protocols[0], Protocols.size());
392}
393
394Sema::DeclTy *Sema::ActOnStartCategoryInterface(
395                      SourceLocation AtInterfaceLoc,
396                      IdentifierInfo *ClassName, SourceLocation ClassLoc,
397                      IdentifierInfo *CategoryName, SourceLocation CategoryLoc,
398                      IdentifierInfo **ProtoRefNames, unsigned NumProtoRefs,
399                      SourceLocation EndProtoLoc) {
400  ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName);
401
402  ObjCCategoryDecl *CDecl =
403    ObjCCategoryDecl::Create(Context, AtInterfaceLoc, CategoryName);
404  CDecl->setClassInterface(IDecl);
405
406  /// Check that class of this category is already completely declared.
407  if (!IDecl || IDecl->isForwardDecl())
408    Diag(ClassLoc, diag::err_undef_interface, ClassName->getName());
409  else {
410    /// Check for duplicate interface declaration for this category
411    ObjCCategoryDecl *CDeclChain;
412    for (CDeclChain = IDecl->getCategoryList(); CDeclChain;
413         CDeclChain = CDeclChain->getNextClassCategory()) {
414      if (CategoryName && CDeclChain->getIdentifier() == CategoryName) {
415        Diag(CategoryLoc, diag::warn_dup_category_def, ClassName->getName(),
416             CategoryName->getName());
417        break;
418      }
419    }
420    if (!CDeclChain)
421      CDecl->insertNextClassCategory();
422  }
423
424  if (NumProtoRefs) {
425    llvm::SmallVector<ObjCProtocolDecl*, 32> RefProtocols;
426    /// Check and then save the referenced protocols.
427    for (unsigned int i = 0; i != NumProtoRefs; i++) {
428      ObjCProtocolDecl* RefPDecl = ObjCProtocols[ProtoRefNames[i]];
429      if (!RefPDecl || RefPDecl->isForwardDecl()) {
430        Diag(CategoryLoc, diag::warn_undef_protocolref,
431             ProtoRefNames[i]->getName(),
432             CategoryName->getName());
433      }
434      if (RefPDecl)
435        RefProtocols.push_back(RefPDecl);
436    }
437    if (!RefProtocols.empty())
438      CDecl->setReferencedProtocolList(&RefProtocols[0], RefProtocols.size());
439  }
440  CDecl->setLocEnd(EndProtoLoc);
441  return CDecl;
442}
443
444/// ActOnStartCategoryImplementation - Perform semantic checks on the
445/// category implementation declaration and build an ObjCCategoryImplDecl
446/// object.
447Sema::DeclTy *Sema::ActOnStartCategoryImplementation(
448                      SourceLocation AtCatImplLoc,
449                      IdentifierInfo *ClassName, SourceLocation ClassLoc,
450                      IdentifierInfo *CatName, SourceLocation CatLoc) {
451  ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName);
452  ObjCCategoryImplDecl *CDecl =
453    ObjCCategoryImplDecl::Create(Context, AtCatImplLoc, CatName, IDecl);
454  /// Check that class of this category is already completely declared.
455  if (!IDecl || IDecl->isForwardDecl())
456    Diag(ClassLoc, diag::err_undef_interface, ClassName->getName());
457
458  /// TODO: Check that CatName, category name, is not used in another
459  // implementation.
460  return CDecl;
461}
462
463Sema::DeclTy *Sema::ActOnStartClassImplementation(
464                      SourceLocation AtClassImplLoc,
465                      IdentifierInfo *ClassName, SourceLocation ClassLoc,
466                      IdentifierInfo *SuperClassname,
467                      SourceLocation SuperClassLoc) {
468  ObjCInterfaceDecl* IDecl = 0;
469  // Check for another declaration kind with the same name.
470  Decl *PrevDecl = LookupDecl(ClassName, Decl::IDNS_Ordinary, TUScope);
471  if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
472    Diag(ClassLoc, diag::err_redefinition_different_kind,
473         ClassName->getName());
474    Diag(PrevDecl->getLocation(), diag::err_previous_definition);
475  }
476  else {
477    // Is there an interface declaration of this class; if not, warn!
478    IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
479    if (!IDecl)
480      Diag(ClassLoc, diag::warn_undef_interface, ClassName->getName());
481  }
482
483  // Check that super class name is valid class name
484  ObjCInterfaceDecl* SDecl = 0;
485  if (SuperClassname) {
486    // Check if a different kind of symbol declared in this scope.
487    PrevDecl = LookupDecl(SuperClassname, Decl::IDNS_Ordinary, TUScope);
488    if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
489      Diag(SuperClassLoc, diag::err_redefinition_different_kind,
490           SuperClassname->getName());
491      Diag(PrevDecl->getLocation(), diag::err_previous_definition);
492    }
493    else {
494      SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
495      if (!SDecl)
496        Diag(SuperClassLoc, diag::err_undef_superclass,
497             SuperClassname->getName(), ClassName->getName());
498      else if (IDecl && IDecl->getSuperClass() != SDecl) {
499        // This implementation and its interface do not have the same
500        // super class.
501        Diag(SuperClassLoc, diag::err_conflicting_super_class,
502             SDecl->getName());
503        Diag(SDecl->getLocation(), diag::err_previous_definition);
504      }
505    }
506  }
507
508  if (!IDecl) {
509    // Legacy case of @implementation with no corresponding @interface.
510    // Build, chain & install the interface decl into the identifier.
511    IDecl = ObjCInterfaceDecl::Create(Context, AtClassImplLoc, ClassName,
512                                      ClassLoc, false, true);
513    ObjCInterfaceDecls[ClassName] = IDecl;
514    IDecl->setSuperClass(SDecl);
515    IDecl->setLocEnd(ClassLoc);
516
517    // Remember that this needs to be removed when the scope is popped.
518    TUScope->AddDecl(IDecl);
519  }
520
521  ObjCImplementationDecl* IMPDecl =
522    ObjCImplementationDecl::Create(Context, AtClassImplLoc, ClassName,
523                                   IDecl, SDecl);
524
525  // Check that there is no duplicate implementation of this class.
526  if (ObjCImplementations[ClassName])
527    // FIXME: Don't leak everything!
528    Diag(ClassLoc, diag::err_dup_implementation_class, ClassName->getName());
529  else // add it to the list.
530    ObjCImplementations[ClassName] = IMPDecl;
531  return IMPDecl;
532}
533
534void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
535                                    ObjCIvarDecl **ivars, unsigned numIvars,
536                                    SourceLocation RBrace) {
537  assert(ImpDecl && "missing implementation decl");
538  ObjCInterfaceDecl* IDecl = getObjCInterfaceDecl(ImpDecl->getIdentifier());
539  if (!IDecl)
540    return;
541  /// Check case of non-existing @interface decl.
542  /// (legacy objective-c @implementation decl without an @interface decl).
543  /// Add implementations's ivar to the synthesize class's ivar list.
544  if (IDecl->ImplicitInterfaceDecl()) {
545    IDecl->addInstanceVariablesToClass(ivars, numIvars, RBrace);
546    return;
547  }
548  // If implementation has empty ivar list, just return.
549  if (numIvars == 0)
550    return;
551
552  assert(ivars && "missing @implementation ivars");
553
554  // Check interface's Ivar list against those in the implementation.
555  // names and types must match.
556  //
557  unsigned j = 0;
558  ObjCInterfaceDecl::ivar_iterator
559    IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end();
560  for (; numIvars > 0 && IVI != IVE; ++IVI) {
561    ObjCIvarDecl* ImplIvar = ivars[j++];
562    ObjCIvarDecl* ClsIvar = *IVI;
563    assert (ImplIvar && "missing implementation ivar");
564    assert (ClsIvar && "missing class ivar");
565    if (ImplIvar->getCanonicalType() != ClsIvar->getCanonicalType()) {
566      Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type,
567           ImplIvar->getIdentifier()->getName());
568      Diag(ClsIvar->getLocation(), diag::err_previous_definition,
569           ClsIvar->getIdentifier()->getName());
570    }
571    // TODO: Two mismatched (unequal width) Ivar bitfields should be diagnosed
572    // as error.
573    else if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) {
574      Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name,
575           ImplIvar->getIdentifier()->getName());
576      Diag(ClsIvar->getLocation(), diag::err_previous_definition,
577           ClsIvar->getIdentifier()->getName());
578      return;
579    }
580    --numIvars;
581  }
582
583  if (numIvars > 0)
584    Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count);
585  else if (IVI != IVE)
586    Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count);
587}
588
589void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method,
590                               bool &IncompleteImpl) {
591  if (!IncompleteImpl) {
592    Diag(ImpLoc, diag::warn_incomplete_impl);
593    IncompleteImpl = true;
594  }
595  Diag(ImpLoc, diag::warn_undef_method_impl, method->getSelector().getName());
596}
597
598/// CheckProtocolMethodDefs - This routine checks unimplemented methods
599/// Declared in protocol, and those referenced by it.
600void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc,
601                                   ObjCProtocolDecl *PDecl,
602                                   bool& IncompleteImpl,
603                                   const llvm::DenseSet<Selector> &InsMap,
604                                   const llvm::DenseSet<Selector> &ClsMap) {
605  // check unimplemented instance methods.
606  for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
607       E = PDecl->instmeth_end(); I != E; ++I) {
608    ObjCMethodDecl *method = *I;
609    if (!InsMap.count(method->getSelector()) &&
610        method->getImplementationControl() != ObjCMethodDecl::Optional)
611      WarnUndefinedMethod(ImpLoc, method, IncompleteImpl);
612  }
613  // check unimplemented class methods
614  for (ObjCProtocolDecl::classmeth_iterator I = PDecl->classmeth_begin(),
615       E = PDecl->classmeth_end(); I != E; ++I) {
616    ObjCMethodDecl *method = *I;
617    if (!ClsMap.count(method->getSelector()) &&
618        method->getImplementationControl() != ObjCMethodDecl::Optional)
619      WarnUndefinedMethod(ImpLoc, method, IncompleteImpl);
620  }
621  // Check on this protocols's referenced protocols, recursively
622  ObjCProtocolDecl** RefPDecl = PDecl->getReferencedProtocols();
623  for (unsigned i = 0; i < PDecl->getNumReferencedProtocols(); i++)
624    CheckProtocolMethodDefs(ImpLoc, RefPDecl[i], IncompleteImpl, InsMap, ClsMap);
625}
626
627void Sema::ImplMethodsVsClassMethods(ObjCImplementationDecl* IMPDecl,
628                                     ObjCInterfaceDecl* IDecl) {
629  llvm::DenseSet<Selector> InsMap;
630  // Check and see if instance methods in class interface have been
631  // implemented in the implementation class.
632  for (ObjCImplementationDecl::instmeth_iterator I = IMPDecl->instmeth_begin(),
633       E = IMPDecl->instmeth_end(); I != E; ++I)
634    InsMap.insert((*I)->getSelector());
635
636  bool IncompleteImpl = false;
637  for (ObjCInterfaceDecl::instmeth_iterator I = IDecl->instmeth_begin(),
638       E = IDecl->instmeth_end(); I != E; ++I)
639    if (!(*I)->isSynthesized() && !InsMap.count((*I)->getSelector()))
640      WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl);
641
642  llvm::DenseSet<Selector> ClsMap;
643  // Check and see if class methods in class interface have been
644  // implemented in the implementation class.
645  for (ObjCImplementationDecl::classmeth_iterator I =IMPDecl->classmeth_begin(),
646       E = IMPDecl->classmeth_end(); I != E; ++I)
647    ClsMap.insert((*I)->getSelector());
648
649  for (ObjCInterfaceDecl::classmeth_iterator I = IDecl->classmeth_begin(),
650       E = IDecl->classmeth_end(); I != E; ++I)
651    if (!ClsMap.count((*I)->getSelector()))
652      WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl);
653
654  // Check the protocol list for unimplemented methods in the @implementation
655  // class.
656  ObjCProtocolDecl** protocols = IDecl->getReferencedProtocols();
657  for (unsigned i = 0; i < IDecl->getNumIntfRefProtocols(); i++)
658    CheckProtocolMethodDefs(IMPDecl->getLocation(), protocols[i],
659                            IncompleteImpl, InsMap, ClsMap);
660}
661
662/// ImplCategoryMethodsVsIntfMethods - Checks that methods declared in the
663/// category interface is implemented in the category @implementation.
664void Sema::ImplCategoryMethodsVsIntfMethods(ObjCCategoryImplDecl *CatImplDecl,
665                                            ObjCCategoryDecl *CatClassDecl) {
666  llvm::DenseSet<Selector> InsMap;
667  // Check and see if instance methods in category interface have been
668  // implemented in its implementation class.
669  for (ObjCCategoryImplDecl::instmeth_iterator I =CatImplDecl->instmeth_begin(),
670       E = CatImplDecl->instmeth_end(); I != E; ++I)
671    InsMap.insert((*I)->getSelector());
672
673  bool IncompleteImpl = false;
674  for (ObjCCategoryDecl::instmeth_iterator I = CatClassDecl->instmeth_begin(),
675       E = CatClassDecl->instmeth_end(); I != E; ++I)
676    if (!InsMap.count((*I)->getSelector()))
677      WarnUndefinedMethod(CatImplDecl->getLocation(), *I, IncompleteImpl);
678
679  llvm::DenseSet<Selector> ClsMap;
680  // Check and see if class methods in category interface have been
681  // implemented in its implementation class.
682  for (ObjCCategoryImplDecl::classmeth_iterator
683       I = CatImplDecl->classmeth_begin(), E = CatImplDecl->classmeth_end();
684       I != E; ++I)
685    ClsMap.insert((*I)->getSelector());
686
687  for (ObjCCategoryDecl::classmeth_iterator I = CatClassDecl->classmeth_begin(),
688       E = CatClassDecl->classmeth_end(); I != E; ++I)
689    if (!ClsMap.count((*I)->getSelector()))
690      WarnUndefinedMethod(CatImplDecl->getLocation(), *I, IncompleteImpl);
691
692  // Check the protocol list for unimplemented methods in the @implementation
693  // class.
694  ObjCProtocolDecl** protocols = CatClassDecl->getReferencedProtocols();
695  for (unsigned i = 0; i < CatClassDecl->getNumReferencedProtocols(); i++) {
696    ObjCProtocolDecl* PDecl = protocols[i];
697    CheckProtocolMethodDefs(CatImplDecl->getLocation(), PDecl, IncompleteImpl,
698                            InsMap, ClsMap);
699  }
700}
701
702/// ActOnForwardClassDeclaration -
703Action::DeclTy *
704Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc,
705                                   IdentifierInfo **IdentList, unsigned NumElts)
706{
707  llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces;
708
709  for (unsigned i = 0; i != NumElts; ++i) {
710    // Check for another declaration kind with the same name.
711    Decl *PrevDecl = LookupDecl(IdentList[i], Decl::IDNS_Ordinary, TUScope);
712    if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
713      // GCC apparently allows the following idiom:
714      //
715      // typedef NSObject < XCElementTogglerP > XCElementToggler;
716      // @class XCElementToggler;
717      //
718      // FIXME: Make an extension?
719      TypedefDecl *TDD = dyn_cast<TypedefDecl>(PrevDecl);
720      if (!TDD || !isa<ObjCInterfaceType>(TDD->getUnderlyingType())) {
721        Diag(AtClassLoc, diag::err_redefinition_different_kind,
722             IdentList[i]->getName());
723        Diag(PrevDecl->getLocation(), diag::err_previous_definition);
724      }
725    }
726    ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
727    if (!IDecl) {  // Not already seen?  Make a forward decl.
728      IDecl = ObjCInterfaceDecl::Create(Context, AtClassLoc, IdentList[i],
729                                        SourceLocation(), true);
730      ObjCInterfaceDecls[IdentList[i]] = IDecl;
731
732      // Remember that this needs to be removed when the scope is popped.
733      TUScope->AddDecl(IDecl);
734    }
735
736    Interfaces.push_back(IDecl);
737  }
738
739  return ObjCClassDecl::Create(Context, AtClassLoc,
740                               &Interfaces[0], Interfaces.size());
741}
742
743
744/// MatchTwoMethodDeclarations - Checks that two methods have matching type and
745/// returns true, or false, accordingly.
746/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons
747bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method,
748                                      const ObjCMethodDecl *PrevMethod) {
749  if (Method->getResultType().getCanonicalType() !=
750      PrevMethod->getResultType().getCanonicalType())
751    return false;
752  for (unsigned i = 0, e = Method->getNumParams(); i != e; ++i) {
753    ParmVarDecl *ParamDecl = Method->getParamDecl(i);
754    ParmVarDecl *PrevParamDecl = PrevMethod->getParamDecl(i);
755    if (Context.getCanonicalType(ParamDecl->getType()) !=
756        Context.getCanonicalType(PrevParamDecl->getType()))
757      return false;
758  }
759  return true;
760}
761
762void Sema::AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method) {
763  ObjCMethodList &FirstMethod = InstanceMethodPool[Method->getSelector()];
764  if (!FirstMethod.Method) {
765    // Haven't seen a method with this selector name yet - add it.
766    FirstMethod.Method = Method;
767    FirstMethod.Next = 0;
768  } else {
769    // We've seen a method with this name, now check the type signature(s).
770    bool match = MatchTwoMethodDeclarations(Method, FirstMethod.Method);
771
772    for (ObjCMethodList *Next = FirstMethod.Next; !match && Next;
773         Next = Next->Next)
774      match = MatchTwoMethodDeclarations(Method, Next->Method);
775
776    if (!match) {
777      // We have a new signature for an existing method - add it.
778      // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
779      struct ObjCMethodList *OMI = new ObjCMethodList(Method, FirstMethod.Next);
780      FirstMethod.Next = OMI;
781    }
782  }
783}
784
785void Sema::AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method) {
786  ObjCMethodList &FirstMethod = FactoryMethodPool[Method->getSelector()];
787  if (!FirstMethod.Method) {
788    // Haven't seen a method with this selector name yet - add it.
789    FirstMethod.Method = Method;
790    FirstMethod.Next = 0;
791  } else {
792    // We've seen a method with this name, now check the type signature(s).
793    bool match = MatchTwoMethodDeclarations(Method, FirstMethod.Method);
794
795    for (ObjCMethodList *Next = FirstMethod.Next; !match && Next;
796         Next = Next->Next)
797      match = MatchTwoMethodDeclarations(Method, Next->Method);
798
799    if (!match) {
800      // We have a new signature for an existing method - add it.
801      // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
802      struct ObjCMethodList *OMI = new ObjCMethodList(Method, FirstMethod.Next);
803      FirstMethod.Next = OMI;
804    }
805  }
806}
807
808// Note: For class/category implemenations, allMethods/allProperties is
809// always null.
810void Sema::ActOnAtEnd(SourceLocation AtEndLoc, DeclTy *classDecl,
811                      DeclTy **allMethods, unsigned allNum,
812                      DeclTy **allProperties, unsigned pNum) {
813  Decl *ClassDecl = static_cast<Decl *>(classDecl);
814
815  // FIXME: If we don't have a ClassDecl, we have an error. We should consider
816  // always passing in a decl. If the decl has an error, isInvalidDecl()
817  // should be true.
818  if (!ClassDecl)
819    return;
820
821  llvm::SmallVector<ObjCMethodDecl*, 32> insMethods;
822  llvm::SmallVector<ObjCMethodDecl*, 16> clsMethods;
823
824  llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap;
825  llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap;
826
827  bool isInterfaceDeclKind =
828        isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl)
829         || isa<ObjCProtocolDecl>(ClassDecl);
830  bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl);
831
832  if (pNum != 0) {
833    if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(ClassDecl))
834      IDecl->addProperties((ObjCPropertyDecl**)allProperties, pNum);
835    else if (ObjCCategoryDecl *CDecl = dyn_cast<ObjCCategoryDecl>(ClassDecl))
836      CDecl->addProperties((ObjCPropertyDecl**)allProperties, pNum);
837    else if (ObjCProtocolDecl *PDecl = dyn_cast<ObjCProtocolDecl>(ClassDecl))
838          PDecl->addProperties((ObjCPropertyDecl**)allProperties, pNum);
839    else
840      assert(false && "ActOnAtEnd - property declaration misplaced");
841  }
842
843  for (unsigned i = 0; i < allNum; i++ ) {
844    ObjCMethodDecl *Method =
845      cast_or_null<ObjCMethodDecl>(static_cast<Decl*>(allMethods[i]));
846
847    if (!Method) continue;  // Already issued a diagnostic.
848    if (Method->isInstance()) {
849      /// Check for instance method of the same name with incompatible types
850      const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()];
851      bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
852                              : false;
853      if (isInterfaceDeclKind && PrevMethod && !match
854          || checkIdenticalMethods && match) {
855          Diag(Method->getLocation(), diag::error_duplicate_method_decl,
856               Method->getSelector().getName());
857          Diag(PrevMethod->getLocation(), diag::err_previous_declaration);
858      } else {
859        insMethods.push_back(Method);
860        InsMap[Method->getSelector()] = Method;
861        /// The following allows us to typecheck messages to "id".
862        AddInstanceMethodToGlobalPool(Method);
863      }
864    }
865    else {
866      /// Check for class method of the same name with incompatible types
867      const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()];
868      bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
869                              : false;
870      if (isInterfaceDeclKind && PrevMethod && !match
871          || checkIdenticalMethods && match) {
872        Diag(Method->getLocation(), diag::error_duplicate_method_decl,
873             Method->getSelector().getName());
874        Diag(PrevMethod->getLocation(), diag::err_previous_declaration);
875      } else {
876        clsMethods.push_back(Method);
877        ClsMap[Method->getSelector()] = Method;
878        /// The following allows us to typecheck messages to "Class".
879        AddFactoryMethodToGlobalPool(Method);
880      }
881    }
882  }
883
884  if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
885    // Compares properties declaraed in this class to those of its
886    // super class.
887    ComparePropertiesInBaseAndSuper(I);
888    MergeProtocolPropertiesIntoClass(I, I);
889    for (ObjCInterfaceDecl::classprop_iterator P = I->classprop_begin(),
890         E = I->classprop_end(); P != E; ++P) {
891      // FIXME: It would be really nice if we could avoid this. Injecting
892      // methods into the interface makes it hard to distinguish "real" methods
893      // from synthesized "property" methods (that aren't in the source).
894      // This complicicates the rewriter's life.
895      I->addPropertyMethods(Context, *P, insMethods);
896    }
897    I->addMethods(&insMethods[0], insMethods.size(),
898                  &clsMethods[0], clsMethods.size(), AtEndLoc);
899
900  } else if (ObjCProtocolDecl *P = dyn_cast<ObjCProtocolDecl>(ClassDecl)) {
901    P->addMethods(&insMethods[0], insMethods.size(),
902                  &clsMethods[0], clsMethods.size(), AtEndLoc);
903  }
904  else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
905    C->addMethods(&insMethods[0], insMethods.size(),
906                  &clsMethods[0], clsMethods.size(), AtEndLoc);
907  }
908  else if (ObjCImplementationDecl *IC =
909                dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
910    IC->setLocEnd(AtEndLoc);
911    if (ObjCInterfaceDecl* IDecl = getObjCInterfaceDecl(IC->getIdentifier()))
912      ImplMethodsVsClassMethods(IC, IDecl);
913  } else {
914    ObjCCategoryImplDecl* CatImplClass = cast<ObjCCategoryImplDecl>(ClassDecl);
915    CatImplClass->setLocEnd(AtEndLoc);
916    ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface();
917    // Find category interface decl and then check that all methods declared
918    // in this interface is implemented in the category @implementation.
919    if (IDecl) {
920      for (ObjCCategoryDecl *Categories = IDecl->getCategoryList();
921           Categories; Categories = Categories->getNextClassCategory()) {
922        if (Categories->getIdentifier() == CatImplClass->getIdentifier()) {
923          ImplCategoryMethodsVsIntfMethods(CatImplClass, Categories);
924          break;
925        }
926      }
927    }
928  }
929}
930
931
932/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for
933/// objective-c's type qualifier from the parser version of the same info.
934static Decl::ObjCDeclQualifier
935CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) {
936  Decl::ObjCDeclQualifier ret = Decl::OBJC_TQ_None;
937  if (PQTVal & ObjCDeclSpec::DQ_In)
938    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_In);
939  if (PQTVal & ObjCDeclSpec::DQ_Inout)
940    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Inout);
941  if (PQTVal & ObjCDeclSpec::DQ_Out)
942    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Out);
943  if (PQTVal & ObjCDeclSpec::DQ_Bycopy)
944    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Bycopy);
945  if (PQTVal & ObjCDeclSpec::DQ_Byref)
946    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Byref);
947  if (PQTVal & ObjCDeclSpec::DQ_Oneway)
948    ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Oneway);
949
950  return ret;
951}
952
953Sema::DeclTy *Sema::ActOnMethodDeclaration(
954    SourceLocation MethodLoc, SourceLocation EndLoc,
955    tok::TokenKind MethodType, DeclTy *classDecl,
956    ObjCDeclSpec &ReturnQT, TypeTy *ReturnType,
957    Selector Sel,
958    // optional arguments. The number of types/arguments is obtained
959    // from the Sel.getNumArgs().
960    ObjCDeclSpec *ArgQT, TypeTy **ArgTypes, IdentifierInfo **ArgNames,
961    AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind,
962    bool isVariadic) {
963  Decl *ClassDecl = static_cast<Decl*>(classDecl);
964
965  // Make sure we can establish a context for the method.
966  if (!ClassDecl) {
967    Diag(MethodLoc, diag::error_missing_method_context);
968    return 0;
969  }
970  QualType resultDeclType;
971
972  if (ReturnType)
973    resultDeclType = QualType::getFromOpaquePtr(ReturnType);
974  else // get the type for "id".
975    resultDeclType = Context.getObjCIdType();
976
977  ObjCMethodDecl* ObjCMethod =
978    ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType,
979                           ClassDecl, AttrList,
980                           MethodType == tok::minus, isVariadic,
981                           false,
982                           MethodDeclKind == tok::objc_optional ?
983                           ObjCMethodDecl::Optional :
984                           ObjCMethodDecl::Required);
985
986  llvm::SmallVector<ParmVarDecl*, 16> Params;
987
988  for (unsigned i = 0; i < Sel.getNumArgs(); i++) {
989    // FIXME: arg->AttrList must be stored too!
990    QualType argType;
991
992    if (ArgTypes[i])
993      argType = QualType::getFromOpaquePtr(ArgTypes[i]);
994    else
995      argType = Context.getObjCIdType();
996    ParmVarDecl* Param = ParmVarDecl::Create(Context, ObjCMethod,
997                                             SourceLocation(/*FIXME*/),
998                                             ArgNames[i], argType,
999                                             VarDecl::None, 0, 0);
1000    Param->setObjCDeclQualifier(
1001      CvtQTToAstBitMask(ArgQT[i].getObjCDeclQualifier()));
1002    Params.push_back(Param);
1003  }
1004
1005  ObjCMethod->setMethodParams(&Params[0], Sel.getNumArgs());
1006  ObjCMethod->setObjCDeclQualifier(
1007    CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier()));
1008  const ObjCMethodDecl *PrevMethod = 0;
1009
1010  // For implementations (which can be very "coarse grain"), we add the
1011  // method now. This allows the AST to implement lookup methods that work
1012  // incrementally (without waiting until we parse the @end). It also allows
1013  // us to flag multiple declaration errors as they occur.
1014  if (ObjCImplementationDecl *ImpDecl =
1015        dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
1016    if (MethodType == tok::minus) {
1017      PrevMethod = ImpDecl->getInstanceMethod(Sel);
1018      ImpDecl->addInstanceMethod(ObjCMethod);
1019    } else {
1020      PrevMethod = ImpDecl->getClassMethod(Sel);
1021      ImpDecl->addClassMethod(ObjCMethod);
1022    }
1023  }
1024  else if (ObjCCategoryImplDecl *CatImpDecl =
1025            dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) {
1026    if (MethodType == tok::minus) {
1027      PrevMethod = CatImpDecl->getInstanceMethod(Sel);
1028      CatImpDecl->addInstanceMethod(ObjCMethod);
1029    } else {
1030      PrevMethod = CatImpDecl->getClassMethod(Sel);
1031      CatImpDecl->addClassMethod(ObjCMethod);
1032    }
1033  }
1034  if (PrevMethod) {
1035    // You can never have two method definitions with the same name.
1036    Diag(ObjCMethod->getLocation(), diag::error_duplicate_method_decl,
1037        ObjCMethod->getSelector().getName());
1038    Diag(PrevMethod->getLocation(), diag::err_previous_declaration);
1039  }
1040  return ObjCMethod;
1041}
1042
1043Sema::DeclTy *Sema::ActOnProperty(Scope *S, SourceLocation AtLoc,
1044                                  FieldDeclarator &FD,
1045                                  ObjCDeclSpec &ODS,
1046                                  Selector GetterSel,
1047                                  Selector SetterSel,
1048                                  tok::ObjCKeywordKind MethodImplKind) {
1049  QualType T = GetTypeForDeclarator(FD.D, S);
1050  ObjCPropertyDecl *PDecl = ObjCPropertyDecl::Create(Context, AtLoc,
1051                                                     FD.D.getIdentifier(), T);
1052  // Regardless of setter/getter attribute, we save the default getter/setter
1053  // selector names in anticipation of declaration of setter/getter methods.
1054  PDecl->setGetterName(GetterSel);
1055  PDecl->setSetterName(SetterSel);
1056
1057  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_readonly)
1058    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readonly);
1059
1060  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_getter)
1061    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_getter);
1062
1063  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_setter)
1064    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_setter);
1065
1066  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_assign)
1067    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_assign);
1068
1069  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_readwrite)
1070    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_readwrite);
1071
1072  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_retain)
1073    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_retain);
1074
1075  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_copy)
1076    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_copy);
1077
1078  if (ODS.getPropertyAttributes() & ObjCDeclSpec::DQ_PR_nonatomic)
1079    PDecl->setPropertyAttributes(ObjCPropertyDecl::OBJC_PR_nonatomic);
1080
1081  if (MethodImplKind == tok::objc_required)
1082    PDecl->setPropertyImplementation(ObjCPropertyDecl::Required);
1083  else if (MethodImplKind == tok::objc_optional)
1084    PDecl->setPropertyImplementation(ObjCPropertyDecl::Optional);
1085
1086  return PDecl;
1087}
1088
1089/// ActOnPropertyImplDecl - This routine performs semantic checks and
1090/// builds the AST node for a property implementation declaration; declared
1091/// as @synthesize or @dynamic.
1092///
1093Sema::DeclTy *Sema::ActOnPropertyImplDecl(SourceLocation AtLoc,
1094                                          SourceLocation PropertyLoc,
1095                                          bool Synthesize,
1096                                          DeclTy *ClassCatImpDecl,
1097                                          IdentifierInfo *PropertyId,
1098                                          IdentifierInfo *PropertyIvar) {
1099  Decl *ClassImpDecl = static_cast<Decl*>(ClassCatImpDecl);
1100  // Make sure we have a context for the property implementation declaration.
1101  if (!ClassImpDecl) {
1102    Diag(AtLoc, diag::error_missing_property_context);
1103    return 0;
1104  }
1105  ObjCPropertyDecl *property = 0;
1106  ObjCInterfaceDecl* IDecl = 0;
1107  // Find the class or category class where this property must have
1108  // a declaration.
1109  ObjCImplementationDecl *IC = 0;
1110  ObjCCategoryImplDecl* CatImplClass = 0;
1111  if ((IC = dyn_cast<ObjCImplementationDecl>(ClassImpDecl))) {
1112    IDecl = getObjCInterfaceDecl(IC->getIdentifier());
1113    // We always synthesize an interface for an implementation
1114    // without an interface decl. So, IDecl is always non-zero.
1115    assert(IDecl &&
1116           "ActOnPropertyImplDecl - @implementation without @interface");
1117
1118    // Look for this property declaration in the @implementation's @interface
1119    property = IDecl->FindPropertyDeclaration(PropertyId);
1120    if (!property) {
1121       Diag(PropertyLoc, diag::error_bad_property_decl, IDecl->getName());
1122      return 0;
1123    }
1124  }
1125  else if ((CatImplClass = dyn_cast<ObjCCategoryImplDecl>(ClassImpDecl))) {
1126    if (Synthesize) {
1127      Diag(AtLoc, diag::error_synthesize_category_decl);
1128      return 0;
1129    }
1130    IDecl = CatImplClass->getClassInterface();
1131    if (!IDecl) {
1132      Diag(AtLoc, diag::error_missing_property_interface);
1133      return 0;
1134    }
1135    ObjCCategoryDecl *Category =
1136      IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier());
1137
1138    // If category for this implementation not found, it is an error which
1139    // has already been reported eralier.
1140    if (!Category)
1141      return 0;
1142    // Look for this property declaration in @implementation's category
1143    property = Category->FindPropertyDeclaration(PropertyId);
1144    if (!property) {
1145      Diag(PropertyLoc, diag::error_bad_category_property_decl,
1146           Category->getName());
1147      return 0;
1148    }
1149  }
1150  else {
1151    Diag(AtLoc, diag::error_bad_property_context);
1152    return 0;
1153  }
1154  ObjCIvarDecl *Ivar = 0;
1155  // Check that we have a valid, previously declared ivar for @synthesize
1156  if (Synthesize) {
1157    // @synthesize
1158    if (!PropertyIvar)
1159      PropertyIvar = PropertyId;
1160    // Check that this is a previously declared 'ivar' in 'IDecl' interface
1161    Ivar = IDecl->FindIvarDeclaration(PropertyIvar);
1162    if (!Ivar) {
1163      Diag(PropertyLoc, diag::error_missing_property_ivar_decl,
1164           PropertyId->getName());
1165      return 0;
1166    }
1167    // Check that type of property and its ivar match.
1168    if (Ivar->getCanonicalType() != property->getCanonicalType()) {
1169      Diag(PropertyLoc, diag::error_property_ivar_type, property->getName(),
1170           Ivar->getName());
1171      return 0;
1172    }
1173
1174  } else if (PropertyIvar) {
1175    // @dynamic
1176    Diag(PropertyLoc, diag::error_dynamic_property_ivar_decl);
1177    return 0;
1178  }
1179  assert (property && "ActOnPropertyImplDecl - property declaration missing");
1180  ObjCPropertyImplDecl *PIDecl =
1181    ObjCPropertyImplDecl::Create(Context, AtLoc, PropertyLoc, property,
1182                                 (Synthesize ?
1183                                  ObjCPropertyImplDecl::OBJC_PR_IMPL_SYNTHSIZE
1184                                  : ObjCPropertyImplDecl::OBJC_PR_IMPL_DYNAMIC),
1185                                  Ivar);
1186  if (IC)
1187    IC->addPropertyImplementation(PIDecl);
1188  else
1189    CatImplClass->addPropertyImplementation(PIDecl);
1190
1191  return PIDecl;
1192}
1193