1 /*
   2  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "oops/objArrayKlass.hpp"
  27 #include "oops/objArrayOop.hpp"
  28 #include "oops/oop.inline.hpp"
  29 
  30 oop objArrayOopDesc::atomic_compare_exchange_oop(int index, oop exchange_value,
  31                                                  oop compare_value) {
  32   volatile HeapWord* dest;
  33   if (UseCompressedOops) {
  34     dest = (HeapWord*)obj_at_addr<narrowOop>(index);
  35   } else {
  36     dest = (HeapWord*)obj_at_addr<oop>(index);
  37   }
  38   oop res = oopDesc::atomic_compare_exchange_oop(exchange_value, dest, compare_value, true);
  39   // update card mark if success
  40   if (res == compare_value) {
  41     update_barrier_set((void*)dest, exchange_value);
  42   }
  43   return res;
  44 }