PR c++/38030, 38850, 39070

PR c++/38030, 38850, 39070
        * pt.c (type_dependent_expression_p_push): New fn.
        (tsubst_copy_and_build) [CALL_EXPR]: Only do arg-dep lookup when the
        substitution makes the call non-dependent.  Preserve koenig_p.
        * parser.c (cp_parser_postfix_expression): Only do arg-dep lookup
        for non-dependent calls.
        * semantics.c (finish_call_expr): Revert earlier changes.
        * cp-tree.h: Revert change to finish_call_expr prototype.

From-SVN: r145360

gcc/cp/ChangeLog

@@ -1,3 +1,14 @@
+2009-03-30  Jason Merrill  <jason@redhat.com>
+
+	PR c++/38030, 38850, 39070
+	* pt.c (type_dependent_expression_p_push): New fn.
+	(tsubst_copy_and_build) [CALL_EXPR]: Only do arg-dep lookup when the
+	substitution makes the call non-dependent.  Preserve koenig_p.
+	* parser.c (cp_parser_postfix_expression): Only do arg-dep lookup
+	for non-dependent calls.
+	* semantics.c (finish_call_expr): Revert earlier changes.
+	* cp-tree.h: Revert change to finish_call_expr prototype.
+
 2009-03-29  Joseph Myers  <joseph@codesourcery.com>
 
 	PR preprocessor/34695

gcc/cp/cp-tree.h

@@ -4602,6 +4602,7 @@ extern bool dependent_template_p		(tree);
 extern bool dependent_template_id_p		(tree, tree);
 extern bool type_dependent_expression_p		(tree);
 extern bool any_type_dependent_arguments_p      (const_tree);
+extern bool type_dependent_expression_p_push	(tree);
 extern bool value_dependent_expression_p	(tree);
 extern bool any_value_dependent_elements_p      (const_tree);
 extern bool dependent_omp_for_p			(tree, tree, tree, tree);
@@ -4761,7 +4762,7 @@ extern tree finish_stmt_expr_expr		(tree, tree);
 extern tree finish_stmt_expr			(tree, bool);
 extern tree stmt_expr_value_expr		(tree);
 extern tree perform_koenig_lookup		(tree, tree);
-extern tree finish_call_expr			(tree, tree, bool, int, 
+extern tree finish_call_expr			(tree, tree, bool, bool, 
 						 tsubst_flags_t);
 extern tree finish_increment_expr		(tree, enum tree_code);
 extern tree finish_this_expr			(void);

gcc/cp/parser.c

@@ -4738,8 +4738,9 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 		    if (args)
 		      {
 			koenig_p = true;
-			postfix_expression
-			  = perform_koenig_lookup (postfix_expression, args);
+			if (!any_type_dependent_arguments_p (args))
+			  postfix_expression
+			    = perform_koenig_lookup (postfix_expression, args);
 		      }
 		    else
 		      postfix_expression
@@ -4761,8 +4762,9 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p,
 		    if (!DECL_FUNCTION_MEMBER_P (fn))
 		      {
 			koenig_p = true;
-			postfix_expression
-			  = perform_koenig_lookup (postfix_expression, args);
+			if (!any_type_dependent_arguments_p (args))
+			  postfix_expression
+			    = perform_koenig_lookup (postfix_expression, args);
 		      }
 		  }
 	      }

gcc/cp/pt.c

@@ -11450,7 +11450,11 @@ tsubst_copy_and_build (tree t,
 		    not appropriate, even if an unqualified-name was used
 		    to denote the function.  */
 		 && !DECL_FUNCTION_MEMBER_P (get_first_fn (function)))
-		|| TREE_CODE (function) == IDENTIFIER_NODE))
+		|| TREE_CODE (function) == IDENTIFIER_NODE)
+	    /* Only do this when substitution turns a dependent call
+	       into a non-dependent call.  */
+	    && type_dependent_expression_p_push (t)
+	    && !any_type_dependent_arguments_p (call_args))
 	  function = perform_koenig_lookup (function, call_args);
 
 	if (TREE_CODE (function) == IDENTIFIER_NODE)
@@ -11481,12 +11485,9 @@ tsubst_copy_and_build (tree t,
 		       /*fn_p=*/NULL,
 		       complain));
 	  }
-	/* Pass -1 for koenig_p so that build_new_function_call will
-	   allow hidden friends found by arg-dependent lookup at template
-	   parsing time.  */
 	return finish_call_expr (function, call_args,
 				 /*disallow_virtual=*/qualified_p,
-				 /*koenig_p*/-1,
+				 koenig_p,
 				 complain);
       }
 
@@ -16454,6 +16455,19 @@ type_dependent_expression_p (tree expression)
   return (dependent_type_p (TREE_TYPE (expression)));
 }
 
+/* Like type_dependent_expression_p, but it also works while not processing
+   a template definition, i.e. during substitution or mangling.  */
+
+bool
+type_dependent_expression_p_push (tree expr)
+{
+  bool b;
+  ++processing_template_decl;
+  b = type_dependent_expression_p (expr);
+  --processing_template_decl;
+  return b;
+}
+
 /* Returns TRUE if ARGS (a TREE_LIST of arguments to a function call)
    contains a type-dependent expression.  */
 

gcc/cp/semantics.c

@@ -1836,14 +1836,10 @@ perform_koenig_lookup (tree fn, tree args)
    qualified.  For example a call to `X::f' never generates a virtual
    call.)
 
-   KOENIG_P is 1 if we want to perform argument-dependent lookup,
-   -1 if we don't, but we want to accept functions found by previous
-   argument-dependent lookup, and 0 if we want nothing to do with it.
-
    Returns code for the call.  */
 
 tree
-finish_call_expr (tree fn, tree args, bool disallow_virtual, int koenig_p,
+finish_call_expr (tree fn, tree args, bool disallow_virtual, bool koenig_p,
 		  tsubst_flags_t complain)
 {
   tree result;
@@ -1866,7 +1862,7 @@ finish_call_expr (tree fn, tree args, bool disallow_virtual, int koenig_p,
 	  || any_type_dependent_arguments_p (args))
 	{
 	  result = build_nt_call_list (fn, args);
-	  KOENIG_LOOKUP_P (result) = koenig_p > 0;
+	  KOENIG_LOOKUP_P (result) = koenig_p;
 	  if (cfun)
 	    {
 	      do
@@ -1956,7 +1952,7 @@ finish_call_expr (tree fn, tree args, bool disallow_virtual, int koenig_p,
 
       if (!result)
 	/* A call to a namespace-scope function.  */
-	result = build_new_function_call (fn, args, koenig_p != 0, complain);
+	result = build_new_function_call (fn, args, koenig_p, complain);
     }
   else if (TREE_CODE (fn) == PSEUDO_DTOR_EXPR)
     {
@@ -1982,9 +1978,7 @@ finish_call_expr (tree fn, tree args, bool disallow_virtual, int koenig_p,
   if (processing_template_decl)
     {
       result = build_call_list (TREE_TYPE (result), orig_fn, orig_args);
-      /* Don't repeat arg-dependent lookup at instantiation time if this call
-         is not type-dependent.  */
-      KOENIG_LOOKUP_P (result) = 0;
+      KOENIG_LOOKUP_P (result) = koenig_p;
     }
   return result;
 }