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 Verifies behaviour of Unsafe.copyMemory
  27  * @library /test/lib
  28  * @modules java.base/jdk.internal.misc
  29  *          java.management
  30  * @run main CopyMemory
  31  */
  32 
  33 import jdk.internal.misc.Unsafe;
  34 import static jdk.test.lib.Asserts.*;
  35 
  36 public class CopyMemory {
  37     final static int LENGTH = 8;
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Unsafe.getUnsafe();
  40         long src = unsafe.allocateMemory(LENGTH);
  41         long dst = unsafe.allocateMemory(LENGTH);
  42         assertNotEquals(src, 0L);
  43         assertNotEquals(dst, 0L);
  44 
  45         // call copyMemory() with different lengths and verify the contents of
  46         // the destination array
  47         for (int i = 0; i < LENGTH; i++) {
  48             unsafe.putByte(src + i, (byte)i);
  49             unsafe.copyMemory(src, dst, i);
  50             for (int j = 0; j < i; j++) {
  51                 assertEquals(unsafe.getByte(src + j), unsafe.getByte(src + j));
  52             }
  53         }
  54         unsafe.freeMemory(src);
  55         unsafe.freeMemory(dst);
  56     }
  57 }