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 }