Move Sema::PropertyIfSetterOrGetter to ObjCMethodDecl::findPropertyDecl.

Then, switch users of PropertyIfSetterOrGetter and LookupPropertyDecl
(the latter by name) over to findPropertyDecl. This actually makes
-Wreceiver-is-weak a bit stronger than it was before.

llvm-svn: 165628

clang/include/clang/AST/DeclObjC.h

@@ -427,7 +427,14 @@ public:
   /// method in the interface or its categories.
   void getOverriddenMethods(
                      SmallVectorImpl<const ObjCMethodDecl *> &Overridden) const;
-  
+
+  /// \brief Returns the property associated with this method's selector.
+  ///
+  /// Note that even if this particular method is not marked as a property
+  /// accessor, it is still possible for it to match a property declared in a
+  /// superclass. Pass \c false if you only want to check the current class.
+  const ObjCPropertyDecl *findPropertyDecl(bool CheckOverrides = true) const;
+
   // Related to protocols declared in  \@protocol
   void setDeclImplementation(ImplementationControl ic) {
     DeclImplementation = ic;

clang/include/clang/Sema/Sema.h

@@ -2308,18 +2308,7 @@ public:
   void CollectImmediateProperties(ObjCContainerDecl *CDecl,
             llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& PropMap,
             llvm::DenseMap<IdentifierInfo *, ObjCPropertyDecl*>& SuperPropMap);
-
-
-  /// LookupPropertyDecl - Looks up a property in the current class and all
-  /// its protocols.
-  ObjCPropertyDecl *LookupPropertyDecl(const ObjCContainerDecl *CDecl,
-                                       IdentifierInfo *II);
   
-  /// PropertyIfSetterOrGetter - Looks up the property if named declaration
-  /// is a setter or getter method backing a property.
-  ObjCPropertyDecl *PropertyIfSetterOrGetter(const NamedDecl *D,
-                                             bool CheckOverrides = true);
-
   /// Called by ActOnProperty to handle \@property declarations in
   /// class extensions.
   Decl *HandlePropertyInClassExtension(Scope *S,

clang/lib/AST/DeclObjC.cpp

@@ -895,6 +895,48 @@ void ObjCMethodDecl::getOverriddenMethods(
   }
 }
 
+const ObjCPropertyDecl *
+ObjCMethodDecl::findPropertyDecl(bool CheckOverrides) const {
+  Selector Sel = getSelector();
+  unsigned NumArgs = Sel.getNumArgs();
+  if (NumArgs > 1)
+    return 0;
+
+  if (getMethodFamily() != OMF_None)
+    return 0;
+  
+  if (isPropertyAccessor()) {
+    const ObjCContainerDecl *Container = cast<ObjCContainerDecl>(getParent());
+    bool IsGetter = (NumArgs == 0);
+
+    for (ObjCContainerDecl::prop_iterator I = Container->prop_begin(),
+                                          E = Container->prop_end();
+         I != E; ++I) {
+      Selector NextSel = IsGetter ? (*I)->getGetterName()
+                                  : (*I)->getSetterName();
+      if (NextSel == Sel)
+        return *I;
+    }
+
+    llvm_unreachable("Marked as a property accessor but no property found!");
+  }
+
+  if (!CheckOverrides)
+    return 0;
+
+  typedef SmallVector<const ObjCMethodDecl *, 8> OverridesTy;
+  OverridesTy Overrides;
+  getOverriddenMethods(Overrides);
+  for (OverridesTy::const_iterator I = Overrides.begin(), E = Overrides.end();
+       I != E; ++I) {
+    if (const ObjCPropertyDecl *Prop = (*I)->findPropertyDecl(false))
+      return Prop;
+  }
+
+  return 0;
+
+}
+
 //===----------------------------------------------------------------------===//
 // ObjCInterfaceDecl
 //===----------------------------------------------------------------------===//

clang/lib/Sema/SemaExpr.cpp

@@ -87,13 +87,17 @@ static AvailabilityResult DiagnoseAvailabilityOfDecl(Sema &S,
       if (const EnumDecl *TheEnumDecl = dyn_cast<EnumDecl>(DC))
         Result = TheEnumDecl->getAvailability(&Message);
     }
+
   const ObjCPropertyDecl *ObjCPDecl = 0;
-  if (Result == AR_Deprecated || Result == AR_Unavailable)
-    if (ObjCPropertyDecl *ND = S.PropertyIfSetterOrGetter(D)) {
-      AvailabilityResult PDeclResult = ND->getAvailability(0);
-      if (PDeclResult == Result)
-        ObjCPDecl = ND;
+  if (Result == AR_Deprecated || Result == AR_Unavailable) {
+    if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
+      if (const ObjCPropertyDecl *PD = MD->findPropertyDecl()) {
+        AvailabilityResult PDeclResult = PD->getAvailability(0);
+        if (PDeclResult == Result)
+          ObjCPDecl = PD;
+      }
     }
+  }
   
   switch (Result) {
     case AR_Available:

clang/lib/Sema/SemaExprObjC.cpp

@@ -1305,8 +1305,8 @@ static void DiagnoseARCUseOfWeakReceiver(Sema &S, Expr *Receiver) {
   Expr *RExpr = Receiver->IgnoreParenImpCasts();
   SourceLocation Loc = RExpr->getLocStart();
   QualType T = RExpr->getType();
-  ObjCPropertyDecl *PDecl = 0;
-  ObjCMethodDecl *GDecl = 0;
+  const ObjCPropertyDecl *PDecl = 0;
+  const ObjCMethodDecl *GDecl = 0;
   if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(RExpr)) {
     RExpr = POE->getSyntacticForm();
     if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(RExpr)) {
@@ -1328,14 +1328,8 @@ static void DiagnoseARCUseOfWeakReceiver(Sema &S, Expr *Receiver) {
     // See if receiver is a method which envokes a synthesized getter
     // backing a 'weak' property.
     ObjCMethodDecl *Method = ME->getMethodDecl();
-    if (Method && Method->isPropertyAccessor()) {
-      Selector Sel = Method->getSelector();
-      if (Sel.getNumArgs() == 0) {
-        const DeclContext *Container = Method->getDeclContext();
-        PDecl = 
-          S.LookupPropertyDecl(cast<ObjCContainerDecl>(Container),
-                               Sel.getIdentifierInfoForSlot(0));
-      }
+    if (Method && Method->getSelector().getNumArgs() == 0) {
+      PDecl = Method->findPropertyDecl();
       if (PDecl)
         T = PDecl->getType();
     }

clang/lib/Sema/SemaObjCProperty.cpp

@@ -1525,97 +1525,6 @@ static void CollectSuperClassPropertyImplementations(ObjCInterfaceDecl *CDecl,
   }
 }
 
-/// LookupPropertyDecl - Looks up a property in the current class and all
-/// its protocols.
-ObjCPropertyDecl *Sema::LookupPropertyDecl(const ObjCContainerDecl *CDecl,
-                                     IdentifierInfo *II) {
-  if (const ObjCInterfaceDecl *IDecl =
-        dyn_cast<ObjCInterfaceDecl>(CDecl)) {
-    for (ObjCContainerDecl::prop_iterator P = IDecl->prop_begin(),
-         E = IDecl->prop_end(); P != E; ++P) {
-      ObjCPropertyDecl *Prop = *P;
-      if (Prop->getIdentifier() == II)
-        return Prop;
-    }
-    // scan through class's protocols.
-    for (ObjCInterfaceDecl::all_protocol_iterator
-         PI = IDecl->all_referenced_protocol_begin(),
-         E = IDecl->all_referenced_protocol_end(); PI != E; ++PI) {
-      ObjCPropertyDecl *Prop = LookupPropertyDecl((*PI), II);
-      if (Prop)
-        return Prop;
-    }
-  }
-  else if (const ObjCProtocolDecl *PDecl =
-            dyn_cast<ObjCProtocolDecl>(CDecl)) {
-    for (ObjCProtocolDecl::prop_iterator P = PDecl->prop_begin(),
-         E = PDecl->prop_end(); P != E; ++P) {
-      ObjCPropertyDecl *Prop = *P;
-      if (Prop->getIdentifier() == II)
-        return Prop;
-    }
-    // scan through protocol's protocols.
-    for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
-         E = PDecl->protocol_end(); PI != E; ++PI) {
-      ObjCPropertyDecl *Prop = LookupPropertyDecl((*PI), II);
-      if (Prop)
-        return Prop;
-    }
-  }
-  else if (const ObjCCategoryDecl *CatDecl =
-            dyn_cast<ObjCCategoryDecl>(CDecl)) {
-    for (ObjCContainerDecl::prop_iterator P = CatDecl->prop_begin(),
-         E = CatDecl->prop_end(); P != E; ++P) {
-      ObjCPropertyDecl *Prop = *P;
-      if (Prop->getIdentifier() == II)
-        return Prop;
-    }
-  }
-  return 0;
-}
-
-/// PropertyIfSetterOrGetter - Looks up the property if named declaration
-/// is a setter or getter method backing a property.
-ObjCPropertyDecl *Sema::PropertyIfSetterOrGetter(const NamedDecl *D,
-                                                 bool CheckOverrides) {
-  const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(D);
-  if (!Method)
-    return 0;
-
-  if (Method->isPropertyAccessor()) {
-    const ObjCContainerDecl *Container =
-      cast<ObjCContainerDecl>(Method->getParent());
-
-    Selector Sel = Method->getSelector();
-    bool IsGetter = (Sel.isUnarySelector());
-
-    for (ObjCContainerDecl::prop_iterator I = Container->prop_begin(),
-                                          E = Container->prop_end();
-         I != E; ++I) {
-      Selector NextSel = IsGetter ? (*I)->getGetterName()
-                                  : (*I)->getSetterName();
-      if (NextSel == Sel)
-        return *I;
-    }
-
-    return 0;
-  }
-
-  if (!CheckOverrides)
-    return 0;
-
-  typedef SmallVector<const ObjCMethodDecl *, 8> OverridesTy;
-  OverridesTy Overrides;
-  Method->getOverriddenMethods(Overrides);
-  for (OverridesTy::const_iterator I = Overrides.begin(), E = Overrides.end();
-       I != E; ++I) {
-    if (ObjCPropertyDecl *Prop = PropertyIfSetterOrGetter(*I, false))
-      return Prop;
-  }
-
-  return 0;
-}
-
 /// \brief Default synthesizes all properties which must be synthesized
 /// in class's \@implementation.
 void Sema::DefaultSynthesizeProperties(Scope *S, ObjCImplDecl* IMPDecl,

clang/test/SemaObjC/property-deprecated-warning.m

@@ -5,7 +5,7 @@
 typedef signed char BOOL;
 
 @protocol P
-@property(nonatomic,assign) id ptarget __attribute__((availability(ios,introduced=2.0,deprecated=3.0))); // expected-note {{property 'ptarget' is declared deprecated here}}
+@property(nonatomic,assign) id ptarget __attribute__((availability(ios,introduced=2.0,deprecated=3.0))); // expected-note 2 {{property 'ptarget' is declared deprecated here}}
 @end
 
 @protocol P1<P>
@@ -50,3 +50,15 @@ void testCustomAccessorNames(CustomAccessorNames *obj) {
   if ([obj isEnabled]) // expected-warning {{'isEnabled' is deprecated: first deprecated in iOS 3.0}}
     [obj setNewDelegate:0]; // expected-warning {{'setNewDelegate:' is deprecated: first deprecated in iOS 3.0}}
 }
+
+
+@interface ProtocolInCategory
+@end
+
+@interface ProtocolInCategory (TheCategory) <P1>
+- (id)ptarget; // expected-note {{method 'ptarget' declared here}}
+@end
+
+id useDeprecatedProperty(ProtocolInCategory *obj) {
+  return [obj ptarget]; // expected-warning {{'ptarget' is deprecated: first deprecated in iOS 3.0}}
+}

clang/test/SemaObjC/weak-receiver-warn.m

@@ -52,7 +52,7 @@ void test0(Test0 *x) {
 @interface MyClass {
     __weak MyClass *_parent;
 }
-@property (weak) MyClass *parent; // expected-note 2 {{property declared here}}
+@property (weak) MyClass *parent; // expected-note 4 {{property declared here}}
 @end
 
 @implementation MyClass
@@ -78,3 +78,23 @@ void testProtocol(id <MyProtocol> input) {
   [input.object Meth]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
 }
 
+
+@interface Subclass : MyClass
+// Unnecessarily redeclare -parent.
+- (id)parent;
+@end
+
+@implementation Subclass
+
+- (id)parent {
+  return [super parent];
+}
+
+- (void)doSomethingElse {
+  [[self parent] doSomething]; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
+
+  (void)self.parent.doSomething; // expected-warning {{weak property may be unpredictably set to nil}} expected-note {{assign the value to a strong variable to keep the object alive during use}}
+}
+
+@end
+