1 /*
 2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
 3  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
 4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 5  *
 6  * This code is free software; you can redistribute it and/or modify it
 7  * under the terms of the GNU General Public License version 2 only, as
 8  * published by the Free Software Foundation.
 9  *
10  * This code is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13  * version 2 for more details (a copy is included in the LICENSE file that
14  * accompanied this code).
15  *
16  * You should have received a copy of the GNU General Public License version
17  * 2 along with this work; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19  *
20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21  * or visit www.oracle.com if you need additional information or have any
22  * questions.
23  *
24  */
25 
26 import java.util.Random;
27 import jdk.test.lib.Utils;
28 
29 /*
30  * @test id=default
31  * @key randomness
32  * @requires vm.gc.Shenandoah
33  * @library /test/lib
34  *
35  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:TieredStopAtLevel=0 -Xmx16m TestArrayCopyStress
36  */
37 
38 /*
39  * @test id=generational
40  * @key randomness
41  * @requires vm.gc.Shenandoah
42  * @library /test/lib
43  *
44  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational -XX:TieredStopAtLevel=0 -Xmx16m TestArrayCopyStress
45  */
46 public class TestArrayCopyStress {
47 
48     private static final int ARRAY_SIZE = 1000;
49     private static final int ITERATIONS = 10000;
50 
51     static class Foo {
52         int num;
53 
54         Foo(int num) {
55             this.num = num;
56         }
57     }
58 
59     static class Bar {}
60 
61     public static void main(String[] args) throws Exception {
62         for (int i = 0; i < ITERATIONS; i++) {
63             testConjoint();
64         }
65     }
66 
67     private static void testConjoint() {
68         Foo[] array = new Foo[ARRAY_SIZE];
69         for (int i = 0; i < ARRAY_SIZE; i++) {
70             array[i] = new Foo(i);
71         }
72         Random rng = Utils.getRandomInstance();
73         int src_idx = rng.nextInt(ARRAY_SIZE);
74         int dst_idx = rng.nextInt(ARRAY_SIZE);
75         int len = rng.nextInt(Math.min(ARRAY_SIZE - src_idx, ARRAY_SIZE - dst_idx));
76         System.arraycopy(array, src_idx, array, dst_idx, len);
77 
78         for (int i = 0; i < ARRAY_SIZE; i++) {
79             if (i >= dst_idx && i < dst_idx + len) {
80                 assertEquals(array[i].num, i - (dst_idx - src_idx));
81             } else {
82                 assertEquals(array[i].num, i);
83             }
84         }
85     }
86 
87     private static void assertEquals(int a, int b) {
88         if (a != b) throw new RuntimeException("assert failed");
89     }
90 
91 }