1 /*
   2  * Copyright (c) 2015, 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  * @test
  26  * @bug 8080699
  27  * @summary eliminated arraycopy node still reachable through exception edges
  28  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestDeadArrayCopyOnMemChain
  29  *
  30  */
  31 
  32 public class TestDeadArrayCopyOnMemChain {
  33     static class A {
  34         int f;
  35     }
  36 
  37     static void test_helper(Object o) {
  38     }
  39 
  40     static void test(int src_off, boolean flag) {
  41         // dst is eliminated first. Eliminating dst causes src to be
  42         // eliminated. When working on the safepoint at the uncommon
  43         // trap in the exception handler, the eliminated ArrayCopyNode
  44         // is reached through the exception edges.
  45         Object[] dst = new Object[10];
  46         Object[] src = new Object[10];
  47 
  48         // src_off causes the exception handler to be run sometimes
  49         try {
  50             System.arraycopy(src, src_off, dst, 0, 10);
  51         } catch (IndexOutOfBoundsException ioobe) {
  52             // flag always false so test becomes uncommon trap. Make
  53             // sure src is live at the unc.
  54             if (flag) {
  55                 test_helper(src);
  56             }
  57         }
  58     }
  59 
  60     static public void main(String[] args) {
  61         for (int i = 0; i < 20000; i++) {
  62             test((i%2) == 0 ? 0 : -1, false);
  63         }
  64     }
  65 }