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  *
  29  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation
  30  *                   compiler.arraycopy.TestDeadArrayCopyOnMemChain
  31  */
  32 
  33 package compiler.arraycopy;
  34 
  35 public class TestDeadArrayCopyOnMemChain {
  36     static class A {
  37         int f;
  38     }
  39 
  40     static void test_helper(Object o) {
  41     }
  42 
  43     static void test(int src_off, boolean flag) {
  44         // dst is eliminated first. Eliminating dst causes src to be
  45         // eliminated. When working on the safepoint at the uncommon
  46         // trap in the exception handler, the eliminated ArrayCopyNode
  47         // is reached through the exception edges.
  48         Object[] dst = new Object[10];
  49         Object[] src = new Object[10];
  50 
  51         // src_off causes the exception handler to be run sometimes
  52         try {
  53             System.arraycopy(src, src_off, dst, 0, 10);
  54         } catch (IndexOutOfBoundsException ioobe) {
  55             // flag always false so test becomes uncommon trap. Make
  56             // sure src is live at the unc.
  57             if (flag) {
  58                 test_helper(src);
  59             }
  60         }
  61     }
  62 
  63     static public void main(String[] args) {
  64         for (int i = 0; i < 20000; i++) {
  65             test((i%2) == 0 ? 0 : -1, false);
  66         }
  67     }
  68 }