[C++ PATCH] Add chain_next GTY markup to struct tinst_level

[Jakub Jelinek]

Hi!

We shouldn't recurse in GC to mark tinst_level chain,
it is IMHO better to iterate through the chain instead.
Bootstrapped/regtested on x86_64-linux and i686-linux,
ok for trunk?

2011-06-08  Jakub Jelinek  <ja...@redhat.com>

        * cp-tree.h (struct tinst_level): Add chain_next GTY
        markup.

--- gcc/cp/cp-tree.h.jj 2011-05-31 08:03:00.000000000 +0200
+++ gcc/cp/cp-tree.h    2011-06-08 16:31:28.000000000 +0200
@@ -4635,7 +4635,7 @@ struct cp_declarator {
 };
 
 /* A level of template instantiation.  */
-struct GTY(()) tinst_level {
+struct GTY((chain_next ("%h.next"))) tinst_level {
   /* The immediately deeper level in the chain.  */
   struct tinst_level *next;
 

        Jakub