re PR middle-end/45854 (ICE in redirect_eh_edge_1, at tree-eh.c:2131)

2010-10-01  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/45854
	* tree-eh.c (cleanup_empty_eh): Avoid degenerate case.

	* g++.dg/torture/pr45854.C: New testcase.

From-SVN: r164881

gcc/ChangeLog

+2010-10-01  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/45854
+	* tree-eh.c (cleanup_empty_eh): Avoid degenerate case.
+
 2010-10-01  Anthony Green  <green@moxielogic.com>
 
 	* config.gcc: Fix moxie-*-rtems* configuration.

gcc/testsuite/ChangeLog

+2010-10-01  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/45854
+	* g++.dg/torture/pr45854.C: New testcase.
+
 2010-09-30  Michael Eager  <eager@eagercon.com>
 
 	* gcc.c-torture/execute/cmpsf-1.c: Rename FLOAT_{MIN,MAX} to

gcc/testsuite/g++.dg/torture/pr45854.C

+// { dg-do compile }
+
+template < typename = void >
+struct X { } ;
+struct Y
+{
+  Y () ;
+} ;
+template < typename = X < > >
+struct T
+{
+  void f ()
+    {
+      f () ;
+    }
+} ;
+struct S
+{
+  S ( X < > = X < > ()) ;
+  ~S ()
+    {
+      T < > () . f () ;
+    }
+} ;
+struct Z
+{
+  S s ;
+  Y y ;
+} a ;
+

gcc/tree-eh.c

@@ -3743,7 +3743,13 @@ cleanup_empty_eh (eh_landing_pad lp)
 
   /* If the block is totally empty, look for more unsplitting cases.  */
   if (gsi_end_p (gsi))
-    return cleanup_empty_eh_unsplit (bb, e_out, lp);
+    {
+      /* For the degenerate case of an infinite loop bail out.  */
+      if (e_out->dest == bb)
+	return false;
+
+      return cleanup_empty_eh_unsplit (bb, e_out, lp);
+    }
 
   /* The block should consist only of a single RESX statement.  */
   resx = gsi_stmt (gsi);