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 /* @test 25 * @bug 8022853 26 * @library /test/lib 27 * @modules java.base/jdk.internal.misc 28 * @run main GetUncompressedObject 29 */ 30 31 import static jdk.test.lib.Asserts.*; 32 33 import jdk.internal.misc.Unsafe; 34 35 public class GetUncompressedObject { 36 37 public static void main(String args[]) throws Exception { 38 Unsafe unsafe = Unsafe.getUnsafe(); 39 40 // Allocate some memory and fill it with non-zero values. 41 final int size = 32; 42 final long address = unsafe.allocateMemory(size); 43 unsafe.setMemory(address, size, (byte) 0x23); 44 45 // The only thing we can do is check for null-ness. 46 // So, store a null somewhere. 47 unsafe.putAddress(address + 16, 0); 48 49 Object nullObj = unsafe.getUncompressedObject(address + 16); 50 if (nullObj != null) { 51 throw new InternalError("should be null"); 52 } 53 } 54 55 }