GetUncompressedObject.java revision 11833:1cbffa2beba6 
1/*
2 * Copyright (c) 2015, 2016, 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/* @test
25 * @bug 8022853
26 * @library /test/lib
27 * @modules java.base/jdk.internal.misc
28 * @run main GetUncompressedObject
29 */
30
31import static jdk.test.lib.Asserts.*;
32
33import jdk.test.lib.Utils;
34import jdk.internal.misc.Unsafe;
35
36public class GetUncompressedObject {
37
38    public static void main(String args[]) throws Exception {
39        Unsafe unsafe = Utils.getUnsafe();
40
41        // Allocate some memory and fill it with non-zero values.
42        final int size = 32;
43        final long address = unsafe.allocateMemory(size);
44        unsafe.setMemory(address, size, (byte) 0x23);
45
46        // The only thing we can do is check for null-ness.
47        // So, store a null somewhere.
48        unsafe.putAddress(address + 16, 0);
49
50        Object nullObj = unsafe.getUncompressedObject(address + 16);
51        if (nullObj != null) {
52            throw new InternalError("should be null");
53        }
54    }
55
56}
57