GetUncompressedObject.java revision 8359:ed6389f70257 
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/* @test
25 * @bug 8022853
26 * @library /testlibrary
27 * @modules java.base/sun.misc
28 * @build jdk.test.lib.*
29 * @run main GetUncompressedObject
30 */
31
32import static jdk.test.lib.Asserts.*;
33
34import jdk.test.lib.*;
35import sun.misc.Unsafe;
36
37public class GetUncompressedObject {
38
39    public static void main(String args[]) throws Exception {
40        Unsafe unsafe = Utils.getUnsafe();
41
42        // Allocate some memory and fill it with non-zero values.
43        final int size = 32;
44        final long address = unsafe.allocateMemory(size);
45        unsafe.setMemory(address, size, (byte) 0x23);
46
47        // The only thing we can do is check for null-ness.
48        // So, store a null somewhere.
49        unsafe.putAddress(address + 16, 0);
50
51        Object nullObj = unsafe.getUncompressedObject(address + 16);
52        if (nullObj != null) {
53            throw new InternalError("should be null");
54        }
55    }
56
57}
58