1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. 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 import java.util.Random;
  26 import jdk.test.lib.Utils;
  27 
  28 /*
  29  * @test TestArrayCopyStress
  30  * @key randomness
  31  * @requires vm.gc.Shenandoah
  32  * @library /test/lib
  33  *
  34  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:TieredStopAtLevel=0 -Xmx16m TestArrayCopyStress
  35  */
  36 public class TestArrayCopyStress {
  37 
  38     private static final int ARRAY_SIZE = 1000;
  39     private static final int ITERATIONS = 10000;
  40 
  41     static class Foo {
  42         int num;
  43 
  44         Foo(int num) {
  45             this.num = num;
  46         }
  47     }
  48 
  49     static class Bar {}
  50 
  51     public static void main(String[] args) throws Exception {
  52         for (int i = 0; i < ITERATIONS; i++) {
  53             testConjoint();
  54         }
  55     }
  56 
  57     private static void testConjoint() {
  58         Foo[] array = new Foo[ARRAY_SIZE];
  59         for (int i = 0; i < ARRAY_SIZE; i++) {
  60             array[i] = new Foo(i);
  61         }
  62         Random rng = Utils.getRandomInstance();
  63         int src_idx = rng.nextInt(ARRAY_SIZE);
  64         int dst_idx = rng.nextInt(ARRAY_SIZE);
  65         int len = rng.nextInt(Math.min(ARRAY_SIZE - src_idx, ARRAY_SIZE - dst_idx));
  66         System.arraycopy(array, src_idx, array, dst_idx, len);
  67 
  68         for (int i = 0; i < ARRAY_SIZE; i++) {
  69             if (i >= dst_idx && i < dst_idx + len) {
  70                 assertEquals(array[i].num, i - (dst_idx - src_idx));
  71             } else {
  72                 assertEquals(array[i].num, i);
  73             }
  74         }
  75     }
  76 
  77     private static void assertEquals(int a, int b) {
  78         if (a != b) throw new RuntimeException("assert failed");
  79     }
  80 
  81 }