tree.c (save_tree_status): Revert 10 Sep change.

        * tree.c (save_tree_status): Revert 10 Sep change.
        (restore_tree_status): Likewise.  Call obstack_free with NULL
        before freeing the obstack proper.

From-SVN: r29355

gcc/ChangeLog

+Sat Sep 11 23:28:33 1999  Richard Henderson  <rth@cygnus.com>
+
+	* tree.c (save_tree_status): Revert 10 Sep change.
+	(restore_tree_status): Likewise.  Call obstack_free with NULL 
+	before freeing the obstack proper.
+
 Sat Sep 11 23:23:46 1999  Richard Henderson  <rth@cygnus.com>
 
 	* cse.c (cse_main): If gc'ing, collect around cse_basic_block.

gcc/tree.c

@@ -365,7 +365,8 @@ save_tree_status (p)
   function_maybepermanent_obstack
     = (struct obstack *) xmalloc (sizeof (struct obstack));
   gcc_obstack_init (function_maybepermanent_obstack);
-  maybepermanent_firstobj = NULL;
+  maybepermanent_firstobj
+    = (char *) obstack_finish (function_maybepermanent_obstack);
 
   function_obstack = (struct obstack *) xmalloc (sizeof (struct obstack));
   gcc_obstack_init (function_obstack);
@@ -394,14 +395,16 @@ restore_tree_status (p)
   /* Free saveable storage used by the function just compiled and not
      saved.  */
   obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj);
+  if (obstack_empty_p (function_maybepermanent_obstack))
+    {
+      obstack_free (function_maybepermanent_obstack, NULL);
+      free (function_maybepermanent_obstack);
+    }
 
   obstack_free (&temporary_obstack, temporary_firstobj);
   obstack_free (&momentary_obstack, momentary_function_firstobj);
 
   obstack_free (function_obstack, NULL);
-
-  if (maybepermanent_firstobj == NULL)
-    free (function_maybepermanent_obstack);
   free (function_obstack);
 
   temporary_firstobj = p->temporary_firstobj;