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  * @run main GetUncompressedObject

    29  */

    30 

    31 import static com.oracle.java.testlibrary.Asserts.*;

    32 

    33 import com.oracle.java.testlibrary.*;

    34 import sun.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 }