re PR c++/56701 ([C++11] The *this* pointer fails to bind to rvalue reference to pointer type)

	PR c++/56701
	* semantics.c (finish_this_expr): 'this' is an rvalue.
	* typeck.c (cp_build_indirect_ref): Handle NOP_EXPR of 'this'.

From-SVN: r197212

gcc/cp/ChangeLog

 2013-03-28  Jason Merrill  <jason@redhat.com>
 
+	PR c++/56701
+	* semantics.c (finish_this_expr): 'this' is an rvalue.
+	* typeck.c (cp_build_indirect_ref): Handle NOP_EXPR of 'this'.
+
 	PR c++/56710
 	* semantics.c (finish_member_declaration): Don't push closure
 	members.

gcc/cp/semantics.c

@@ -2297,7 +2297,6 @@ finish_this_expr (void)
         result = lambda_expr_this_capture (CLASSTYPE_LAMBDA_EXPR (type));
       else
         result = current_class_ptr;
-
     }
   else if (current_function_decl
 	   && DECL_STATIC_FUNCTION_P (current_function_decl))
@@ -2314,6 +2313,9 @@ finish_this_expr (void)
       result = error_mark_node;
     }
 
+  /* The keyword 'this' is a prvalue expression.  */
+  result = rvalue (result);
+
   return result;
 }
 

gcc/cp/typeck.c

@@ -2843,7 +2843,11 @@ cp_build_indirect_ref (tree ptr, ref_operator errorstring,
 {
   tree pointer, type;
 
-  if (ptr == current_class_ptr)
+  if (ptr == current_class_ptr
+      || (TREE_CODE (ptr) == NOP_EXPR
+	  && TREE_OPERAND (ptr, 0) == current_class_ptr
+	  && (same_type_ignoring_top_level_qualifiers_p
+	      (TREE_TYPE (ptr), TREE_TYPE (current_class_ptr)))))
     return current_class_ref;
 
   pointer = (TREE_CODE (TREE_TYPE (ptr)) == REFERENCE_TYPE

gcc/testsuite/g++.dg/cpp0x/rv-this.C

+// PR c++/56701
+// { dg-require-effective-target c++11 }
+
+struct A
+{
+  void f(){ A*&& a = this; }
+};