--- a/hotspot/src/share/vm/utilities/array.hpp	Fri Nov 09 08:36:17 2012 -0800
+++ b/hotspot/src/share/vm/utilities/array.hpp	Mon Nov 12 14:03:53 2012 -0800
@@ -353,9 +353,9 @@
   // sort the array.
   bool contains(const T& x) const      { return index_of(x) >= 0; }
 
-  T    at(int i) const                 { return _data[i]; }
-  void at_put(const int i, const T& x) { _data[i] = x; }
-  T*   adr_at(const int i)             { return &_data[i]; }
+  T    at(int i) const                 { assert(i >= 0 && i< _length, err_msg_res("oob: 0 <= %d < %d", i, _length)); return _data[i]; }
+  void at_put(const int i, const T& x) { assert(i >= 0 && i< _length, err_msg_res("oob: 0 <= %d < %d", i, _length)); _data[i] = x; }
+  T*   adr_at(const int i)             { assert(i >= 0 && i< _length, err_msg_res("oob: 0 <= %d < %d", i, _length)); return &_data[i]; }
   int  find(const T& x)                { return index_of(x); }
 
   T at_acquire(const int which)              { return OrderAccess::load_acquire(adr_at(which)); }