@@ -1,5 +1,5 @@
/* Exception handling semantics and decomposition for trees.
- Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GCC.
@@ -3724,6 +3724,42 @@ cleanup_empty_eh_unsplit (basic_block bb
return false;
}
+/* Return true if edge E_FIRST is part of an empty infinite loop
+ or leads to such a loop through a series of single successor
+ empty bbs. */
+
+static bool
+infinite_empty_loop_p (edge e_first)
+{
+ bool inf_loop = false;
+ edge e;
+
+ if (e_first->dest == e_first->src)
+ return true;
+
+ e_first->src->aux = (void *) 1;
+ for (e = e_first; single_succ_p (e->dest); e = single_succ_edge (e->dest))
+ {
+ gimple_stmt_iterator gsi;
+ if (e->dest->aux)
+ {
+ inf_loop = true;
+ break;
+ }
+ e->dest->aux = (void *) 1;
+ gsi = gsi_after_labels (e->dest);
+ if (!gsi_end_p (gsi) && is_gimple_debug (gsi_stmt (gsi)))
+ gsi_next_nondebug (&gsi);
+ if (!gsi_end_p (gsi))
+ break;
+ }
+ e_first->src->aux = NULL;
+ for (e = e_first; e->dest->aux; e = single_succ_edge (e->dest))
+ e->dest->aux = NULL;
+
+ return inf_loop;
+}
+
/* Examine the block associated with LP to determine if it's an empty
handler for its EH region. If so, attempt to redirect EH edges to
an outer region. Return true the CFG was updated in any way. This
@@ -3763,7 +3799,7 @@ cleanup_empty_eh (eh_landing_pad lp)
if (gsi_end_p (gsi))
{
/* For the degenerate case of an infinite loop bail out. */
- if (e_out->dest == bb)
+ if (infinite_empty_loop_p (e_out))
return false;
return cleanup_empty_eh_unsplit (bb, e_out, lp);
@@ -0,0 +1,19 @@
+// PR tree-optimization/47290
+// { dg-do compile }
+
+struct V
+{
+ V (int = 0);
+ ~V ()
+ {
+ for (;;)
+ ;
+ }
+ int size ();
+};
+
+struct S
+{
+ V a, b;
+ S () : b (a.size ()) {}
+} s;