[PATCH] don't use build_function_type in the Ada FE

[PATCH] don't use build_function_type in the Ada FE

[Nathan Froyd]

As $SUBJECT suggests.  Rather pleasant how easy this was.

Tested on x86_64-unknown-linux-gnu.  OK to commit?

-Nathan

gcc/ada/
	* gcc-interface/utils.c (def_fn_type): Don't call build_function_type;
	call build_function_type_vec or build_varargs_function_type_vec
	instead.
	(create_subprog_type): Likewise.

diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c
index cfa58b9..efeceea 100644
--- a/gcc/ada/gcc-interface/utils.c
+++ b/gcc/ada/gcc-interface/utils.c
@@ -1181,24 +1181,16 @@ create_subprog_type (tree return_type, tree param_decl_list, tree cico_list,
 		     bool return_unconstrained_p, bool return_by_direct_ref_p,
 		     bool return_by_invisi_ref_p)
 {
-  /* A chain of TREE_LIST nodes whose TREE_VALUEs are the data type nodes of
-     the subprogram formal parameters.  This list is generated by traversing
-     the input list of PARM_DECL nodes.  */
-  tree param_type_list = NULL_TREE;
+  /* A list of the data type nodes of the subprogram formal parameters.
+     This list is generated by traversing the input list of PARM_DECL
+     nodes.  */
+  VEC(tree,gc) *param_type_list = NULL;
   tree t, type;
 
   for (t = param_decl_list; t; t = DECL_CHAIN (t))
-    param_type_list = tree_cons (NULL_TREE, TREE_TYPE (t), param_type_list);
+    VEC_safe_push (tree, gc, param_type_list, TREE_TYPE (t));
 
-  /* The list of the function parameter types has to be terminated by the void
-     type to signal to the back-end that we are not dealing with a variable
-     parameter subprogram, but that it has a fixed number of parameters.  */
-  param_type_list = tree_cons (NULL_TREE, void_type_node, param_type_list);
-
-  /* The list of argument types has been created in reverse so reverse it.  */
-  param_type_list = nreverse (param_type_list);
-
-  type = build_function_type (return_type, param_type_list);
+  type = build_function_type_vec (return_type, param_type_list);
 
   /* TYPE may have been shared since GCC hashes types.  If it has a different
      CICO_LIST, make a copy.  Likewise for the various flags.  */
@@ -4959,7 +4951,8 @@ static GTY(()) tree builtin_types[(int) BT_LAST + 1];
 static void
 def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...)
 {
-  tree args = NULL, t;
+  tree t;
+  tree *args = XALLOCAVEC (tree, n);
   va_list list;
   int i;
 
@@ -4970,18 +4963,17 @@ def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...)
       t = builtin_types[a];
       if (t == error_mark_node)
 	goto egress;
-      args = tree_cons (NULL_TREE, t, args);
+      args[i] = t;
     }
   va_end (list);
 
-  args = nreverse (args);
-  if (!var)
-    args = chainon (args, void_list_node);
-
   t = builtin_types[ret];
   if (t == error_mark_node)
     goto egress;
-  t = build_function_type (t, args);
+  if (var)
+    t = build_varargs_function_type_array (t, n, args);
+  else
+    t = build_function_type_array (t, n, args);
 
  egress:
   builtin_types[def] = t;

Re: [PATCH] don't use build_function_type in the Ada FE

[Eric Botcazou]

> gcc/ada/
> 	* gcc-interface/utils.c (def_fn_type): Don't call build_function_type;
> 	call build_function_type_vec or build_varargs_function_type_vec
> 	instead.

build_function_type_array or build_varargs_function_type_array.

> 	(create_subprog_type): Likewise.

Here it's build_function_type_vec.

OK with these changes.

-- 
Eric Botcazou