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.test.lib.unsafe.UnsafeHelper; 34 import jdk.internal.misc.Unsafe; 35 import static jdk.test.lib.Asserts.*; 36 37 public class CopyMemory { 38 final static int LENGTH = 8; 39 public static void main(String args[]) throws Exception { 40 Unsafe unsafe = UnsafeHelper.getUnsafe(); 41 long src = unsafe.allocateMemory(LENGTH); 42 long dst = unsafe.allocateMemory(LENGTH); 43 assertNotEquals(src, 0L); 44 assertNotEquals(dst, 0L); 45 46 // call copyMemory() with different lengths and verify the contents of 47 // the destination array 48 for (int i = 0; i < LENGTH; i++) { 49 unsafe.putByte(src + i, (byte)i); 50 unsafe.copyMemory(src, dst, i); 51 for (int j = 0; j < i; j++) { 52 assertEquals(unsafe.getByte(src + j), unsafe.getByte(src + j)); 53 } 54 } 55 unsafe.freeMemory(src); 56 unsafe.freeMemory(dst); 57 } 58 }