fix PR4021, array and functions decay in the receiver position of an objc message send.

llvm-svn: 70373

clang/lib/Sema/SemaExprObjC.cpp

@@ -461,8 +461,12 @@ Sema::ExprResult Sema::ActOnInstanceMessage(ExprTy *receiver, Selector Sel,
   
   Expr **ArgExprs = reinterpret_cast<Expr **>(Args);
   Expr *RExpr = static_cast<Expr *>(receiver);
+  
+  // If necessary, apply function/array conversion to the receiver.
+  // C99 6.7.5.3p[7,8].
+  DefaultFunctionArrayConversion(RExpr);
+  
   QualType returnType;
-
   QualType ReceiverCType =
     Context.getCanonicalType(RExpr->getType()).getUnqualifiedType();
 

clang/test/SemaObjC/message.m

@@ -1,5 +1,10 @@
 // RUN: clang-cc -fsyntax-only -verify %s
 
+typedef struct objc_object {
+  Class isa;
+} *id;
+
+
 @interface foo
 - (void)meth;
 @end
@@ -86,5 +91,10 @@ int test5(int X) {
   int b = [S somemsg];  // expected-error {{bad receiver type 'struct S'}}
 }
 
-
+// PR4021
+void foo4() {
+  struct objc_object X[10];
+  
+  [X rect];
+}