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 /*
  25  * @test
  26  * @summary Verify behaviour of Unsafe.get/putObject
  27  * @library /test/lib
  28  * @modules java.base/jdk.internal.misc
  29  *          java.management
  30  * @run main GetPutObject
  31  */
  32 
  33 import java.lang.reflect.Field;
  34 import jdk.internal.misc.Unsafe;
  35 import static jdk.test.lib.Asserts.*;
  36 
  37 public class GetPutObject {
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Unsafe.getUnsafe();
  40         Test t = new Test();
  41         Object o = new Object();
  42         Field field = Test.class.getField("o");
  43 
  44         long offset = unsafe.objectFieldOffset(field);
  45         assertEquals(t.o, unsafe.getObject(t, offset));
  46 
  47         unsafe.putObject(t, offset, o);
  48         assertEquals(o, unsafe.getObject(t, offset));
  49 
  50         Object arrayObject[] = { unsafe, null, new Object() };
  51         int scale = unsafe.arrayIndexScale(arrayObject.getClass());
  52         offset = unsafe.arrayBaseOffset(arrayObject.getClass());
  53         for (int i = 0; i < arrayObject.length; i++) {
  54             assertEquals(unsafe.getObject(arrayObject, offset), arrayObject[i]);
  55             offset += scale;
  56         }
  57     }
  58 
  59     static class Test {
  60         public Object o = new Object();
  61     }
  62 }