semantics.c (finish_decltype_type): Simplify handling of unknown type.

	* semantics.c (finish_decltype_type): Simplify handling of unknown
	type.

From-SVN: r172140

gcc/cp/ChangeLog

 2011-04-07  Jason Merrill  <jason@redhat.com>
 
+	* semantics.c (finish_decltype_type): Simplify handling of unknown
+	type.
+
 	* semantics.c (finish_decltype_type): Add complain parm.
 	* cp-tree.h: Adjust.
 	* parser.c (cp_parser_decltype): Adjust.

gcc/cp/semantics.c

@@ -4788,7 +4788,6 @@ tree
 finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
 		      tsubst_flags_t complain)
 {
-  tree orig_expr = expr;
   tree type = NULL_TREE;
 
   if (!expr || error_operand_p (expr))
@@ -4826,6 +4825,13 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
 
   expr = resolve_nondeduced_context (expr);
 
+  if (type_unknown_p (expr))
+    {
+      if (complain & tf_error)
+	error ("decltype cannot resolve address of overloaded function");
+      return error_mark_node;
+    }
+
   /* To get the size of a static data member declared as an array of
      unknown bound, we need to instantiate it.  */
   if (TREE_CODE (expr) == VAR_DECL
@@ -4855,28 +4861,9 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
         expr = TREE_OPERAND (expr, 1);
 
       if (TREE_CODE (expr) == BASELINK)
-        /* See through BASELINK nodes to the underlying functions.  */
+        /* See through BASELINK nodes to the underlying function.  */
         expr = BASELINK_FUNCTIONS (expr);
 
-      if (TREE_CODE (expr) == TEMPLATE_ID_EXPR)
-	expr = TREE_OPERAND (expr, 0);
-
-      if (TREE_CODE (expr) == OVERLOAD)
-        {
-          if (OVL_CHAIN (expr)
-	      || TREE_CODE (OVL_FUNCTION (expr)) == TEMPLATE_DECL)
-            {
-	      if (complain & tf_error)
-		error ("%qE refers to a set of overloaded functions",
-		       orig_expr);
-              return error_mark_node;
-            }
-          else
-            /* An overload set containing only one function: just look
-               at that function.  */
-            expr = OVL_FUNCTION (expr);
-        }
-
       switch (TREE_CODE (expr))
         {
         case FIELD_DECL:
@@ -4918,10 +4905,7 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
           break;
 
         default:
-	  gcc_assert (TYPE_P (expr) || DECL_P (expr)
-		      || TREE_CODE (expr) == SCOPE_REF);
-	  if (complain & tf_error)
-	    error ("argument to decltype must be an expression");
+	  gcc_unreachable ();
           return error_mark_node;
         }
     }
@@ -4957,13 +4941,6 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
 	}
     }
 
-  if (!type || type == unknown_type_node)
-    {
-      if (complain & tf_error)
-	error ("type of %qE is unknown", expr);
-      return error_mark_node;
-    }
-
   return type;
 }