jdk

1
/*
2
 * Copyright (c) 2013, 2020, 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
package gc;
25

26
/**
27
 * @test TestObjectAlignment
28
 * @bug 8021823
29
 * @requires vm.bits == "64"
30
 * @summary G1: Concurrent marking crashes with -XX:ObjectAlignmentInBytes>=32 in 64bit VMs
31
 * @library /test/lib
32
 * @modules java.base/jdk.internal.misc
33
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:+ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=8
34
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:+ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=16
35
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:+ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=32
36
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:+ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=64
37
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:+ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=128
38
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:+ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=256
39
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:-ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=8
40
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:-ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=16
41
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:-ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=32
42
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:-ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=64
43
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:-ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=128
44
 * @run main/othervm gc.TestObjectAlignment -Xmx20M -XX:-ExplicitGCInvokesConcurrent -XX:ObjectAlignmentInBytes=256
45
 */
46

47
public class TestObjectAlignment {
48

49
  public static byte[] garbage;
50

51
  public static void main(String[] args) throws Exception {
52
    for (int i = 0; i < 10; i++) {
53
      garbage = new byte[1000];
54
      System.gc();
55
    }
56
  }
57
}
58