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
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  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
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  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.internal.misc.Unsafe;
  34 
  35 public class GetUncompressedObject {
  36 
  37     public static void main(String args[]) throws Exception {
  38         Unsafe unsafe = Unsafe.getUnsafe();
  39 
  40         // Allocate some memory and fill it with non-zero values.
  41         final int size = 32;
  42         final long address = unsafe.allocateMemory(size);
  43         unsafe.setMemory(address, size, (byte) 0x23);
  44 
  45         // The only thing we can do is check for null-ness.
  46         // So, store a null somewhere.
  47         unsafe.putAddress(address + 16, 0);
  48 
  49         Object nullObj = unsafe.getUncompressedObject(address + 16);
  50         if (nullObj != null) {
  51             throw new InternalError("should be null");
  52         }
  53     }
  54 
  55 }