Cannot type cast @selector expressions.

llvm-svn: 72284

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -1423,6 +1423,8 @@ def err_typecheck_expect_scalar_operand : Error<
   "operand of type %0 where arithmetic or pointer type is required">;
 def err_typecheck_cond_incompatible_operands : Error<
   "incompatible operand types (%0 and %1)">;
+def err_cast_selector_expr : Error<
+  "cannot type cast @selector expression">;
 def warn_typecheck_cond_incompatible_pointers : Warning<
   "pointer type mismatch (%0 and %1)">;
 def warn_typecheck_cond_pointer_integer_mismatch : Warning<

clang/lib/Sema/SemaExpr.cpp

@@ -2820,6 +2820,8 @@ bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) {
                   diag::err_cast_pointer_to_non_pointer_int)
         << castType << castExpr->getSourceRange();
   }
+  if (isa<ObjCSelectorExpr>(castExpr))
+    return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr);
   return false;
 }
 

clang/test/SemaObjC/selector-error.m

@@ -0,0 +1,20 @@
+// RUN: clang-cc  -fsyntax-only -verify %s
+
+@interface Foo
+- (char*) foo;
+- (void) bar;
+@end
+
+@implementation Foo
+- (void) bar
+{
+}
+
+- (char*) foo
+{
+  char* a,b,c;
+  a = (char*)@selector(bar);  // expected-error {{cannot type cast @selector expression}}
+  return (char*)@selector(bar);  // expected-error {{cannot type cast @selector expression}}
+}
+@end
+