except.c (reachable_handlers): Handle a region being removed out from under a RESX.

        * except.c (reachable_handlers): Handle a region being removed
        out from under a RESX.

From-SVN: r44363

gcc/ChangeLog

 2001-07-25  Richard Henderson  <rth@redhat.com>
 
+	* except.c (reachable_handlers): Handle a region being removed
+	out from under a RESX.
+
+2001-07-25  Richard Henderson  <rth@redhat.com>
+
 	* config/alpha/alpha.c (alpha_emit_conditional_move): Always
 	swap GE/GT if its an fp comparison.
 

gcc/except.c

@@ -2728,14 +2728,20 @@ reachable_handlers (insn)
   region = cfun->eh->region_array[region_number];
 
   type_thrown = NULL_TREE;
-  if (region->type == ERT_THROW)
+  if (GET_CODE (insn) == JUMP_INSN
+      && GET_CODE (PATTERN (insn)) == RESX)
+    {
+      /* A RESX leaves a region instead of entering it.  Thus the
+	 region itself may have been deleted out from under us.  */
+      if (region == NULL)
+	return NULL;
+      region = region->outer;
+    }
+  else if (region->type == ERT_THROW)
     {
       type_thrown = region->u.throw.type;
       region = region->outer;
     }
-  else if (GET_CODE (insn) == JUMP_INSN
-	   && GET_CODE (PATTERN (insn)) == RESX)
-    region = region->outer;
 
   for (; region; region = region->outer)
     if (reachable_next_level (region, type_thrown, &info) >= RNL_CAUGHT)