GC Bug

[Bernd Schmidt]

On Thu, 9 Sep 1999, Richard Earnshaw wrote:

> I'm trying to track down a GC problem on the ARM, which causes a crash.  
> I've found the following fragment in except.c:
> 
> static rtx
> call_get_eh_context ()
> {
>   static tree fn;
>   tree expr;
> 
>   if (fn == NULL_TREE)
>     {
> 
> 
> Note that fn is persistent, but there seems to be no gc root registered 
> for this when it is first allocated.  Hence, the tree can get GCed later 
> and if subsequently recalled can contain garbage.

Try this patch.

Bernd

	* except.c (call_get_eh_context): Add root when allocating static
	tree variable.

Index: except.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/gcc/except.c,v
retrieving revision 1.96
diff -u -p -r1.96 except.c
--- except.c	1999/09/09 07:17:20	1.96
+++ except.c	1999/09/09 13:45:50
@@ -1101,6 +1101,8 @@ call_get_eh_context ()
       make_decl_rtl (fn, NULL_PTR, 1);
       assemble_external (fn);
       pop_obstacks ();
+
+      ggc_add_tree_root (&fn, 1);
     }
 
   expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);