[tree-ssa] GGC friendly function save/restore

[Richard Henderson]

On Fri, Nov 28, 2003 at 11:18:16PM +0100, Jan Hubicka wrote:
>     /* Nonzero if the rtl inliner has saved the function for inlining.  */
>     unsigned int saved_for_inline : 1;
> + 
> +   /* Saved tree and arguments during tree optimization.  Used later for
> +      inlining */
> +   tree GTY(()) saved_tree;
> +   tree GTY(()) saved_args;

Not ok.

(1) No need for GTY markings on individual fields.
(2) You didn't put these at the correct place.  Read the comments.

> +   if (cfun->saved_tree)
> +     {
> +       /* We might need the body of this function so that we can expand
> +          it inline somewhere else.  */
> +       DECL_SAVED_TREE (fndecl) = cfun->saved_tree;
> +       DECL_ARGUMENTS (fndecl) = cfun->saved_args;
> +     }
> +   cfun = 0;

(3) What do you think this is doing?
cfun == DECL_SAVED_INSNS (current_function_decl), so this is still
reachable.  You definitely beed to zap saved_tree/saved_args here.
Which also means that the zapping of saved_tree earlier should have
been useless.

(4) I also don't see that you've replaced the ggc_collect call that
you removed.  The intent is to get rid of all the rtl that is now
most definitely garbage.


r~