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 /test/lib
  27  * @modules java.base/jdk.internal.misc
  28  * @run main GetUncompressedObject
  29  */
  30 
  31 import static jdk.test.lib.Asserts.*;
  32 
  33 import jdk.test.lib.Utils;
  34 import jdk.internal.misc.Unsafe;
  35 
  36 public 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 }