Fix <rdar://problem/6497242> Inherited overridden protocol declared objects don't work.

Change Sema::DiagnosePropertyMismatch() to check for type compatibility (rather than type equivalence, which is too strict).

llvm-svn: 65949

clang/include/clang/Basic/DiagnosticSemaKinds.def

@@ -144,8 +144,8 @@ DIAG(warn_readonly_property, WARNING,
      "'readwrite' of property inherited from %1")
 DIAG(warn_property_attribute, WARNING,
      "property %0 '%1' attribute does not match the property inherited from %2")
-DIAG(warn_property_type, WARNING,
-     "property type %0 does not match property type inherited from %1")
+DIAG(warn_property_types_are_incompatible, WARNING,
+     "property type %0 is incompatible with type %1 inherited from %2")
 DIAG(err_undef_interface, ERROR,
      "cannot find interface declaration for %0")
 DIAG(warn_dup_category_def, WARNING,

clang/lib/Sema/SemaDeclObjC.cpp

@@ -320,12 +320,20 @@ Sema::DiagnosePropertyMismatch(ObjCPropertyDecl *Property,
   if (Property->getGetterName() != SuperProperty->getGetterName())
     Diag(Property->getLocation(), diag::warn_property_attribute)
       << Property->getDeclName() << "getter" << inheritedName;
-  
-  if (Context.getCanonicalType(Property->getType()) != 
-          Context.getCanonicalType(SuperProperty->getType()))
-    Diag(Property->getLocation(), diag::warn_property_type)
-      << Property->getType() << inheritedName;
-  
+
+  QualType LHSType = 
+    Context.getCanonicalType(SuperProperty->getType());
+  QualType RHSType = 
+    Context.getCanonicalType(Property->getType());
+    
+  if (!Context.typesAreCompatible(LHSType, RHSType)) {
+    // FIXME: Incorporate this test with typesAreCompatible.
+    if (LHSType->isObjCQualifiedIdType() && RHSType->isObjCQualifiedIdType())
+      if (ObjCQualifiedIdTypesAreCompatible(LHSType, RHSType, false))
+        return;
+    Diag(Property->getLocation(), diag::warn_property_types_are_incompatible)
+      << Property->getType() << SuperProperty->getType() << inheritedName;
+  }
 }
 
 /// ComparePropertiesInBaseAndSuper - This routine compares property

clang/lib/Sema/SemaExprObjC.cpp

@@ -540,6 +540,7 @@ static bool ClassImplementsProtocol(ObjCProtocolDecl *lProto,
 
 /// ObjCQualifiedIdTypesAreCompatible - We know that one of lhs/rhs is an
 /// ObjCQualifiedIDType.
+/// FIXME: Move to ASTContext::typesAreCompatible() and friends.
 bool Sema::ObjCQualifiedIdTypesAreCompatible(QualType lhs, QualType rhs,
                                              bool compare) {
   // Allow id<P..> and an 'id' or void* type in all cases.

clang/test/SemaObjC/property-inherited.m

@@ -0,0 +1,44 @@
+// RUN: clang %s -fsyntax-only -verify 
+
+// <rdar://problem/6497242> Inherited overridden protocol declared objects don't work
+
+@protocol NSObject @end
+@interface NSObject @end
+
+@protocol FooDelegate<NSObject>
+@optional
+- (void)fooTask;
+@end
+
+@protocol BarDelegate<NSObject, FooDelegate>
+@optional
+- (void)barTask;
+@end
+
+@interface Foo : NSObject {
+  id _delegate;
+}
+@property(nonatomic, assign) id<FooDelegate> delegate;
+@property(nonatomic, assign) id<BarDelegate> delegate2;
+@end
+@interface Bar : Foo {
+}
+@property(nonatomic, assign) id<BarDelegate> delegate;
+@property(nonatomic, assign) id<FooDelegate> delegate2; // expected-warning{{property type 'id<FooDelegate>' is incompatible with type 'id<BarDelegate>' inherited from 'Foo'}}
+@end
+
+@interface NSData @end
+
+@interface NSMutableData : NSData @end
+
+@interface Base : NSData 
+@property(assign) id ref;
+@property(assign) Base *p_base;
+@property(assign) NSMutableData *p_data;	
+@end
+
+@interface Data : Base 
+@property(assign) NSData *ref;	
+@property(assign) Data *p_base;	
+@property(assign) NSData *p_data;	// expected-warning{{property type 'NSData *' is incompatible with type 'NSMutableData *' inherited from 'Base'}}
+@end