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 * Verify behaviour of Unsafe.get/putAddress and Unsafe.addressSize 27 * @library /test/lib 28 * @modules java.base/jdk.internal.misc 29 * java.management 30 * @run main GetPutAddress 31 */ 32 33 import jdk.test.lib.Platform; 34 import jdk.test.lib.unsafe.UnsafeHelper; 35 import jdk.internal.misc.Unsafe; 36 import static jdk.test.lib.Asserts.*; 37 38 public class GetPutAddress { 39 public static void main(String args[]) throws Exception { 40 Unsafe unsafe = UnsafeHelper.getUnsafe(); 41 int addressSize = unsafe.addressSize(); 42 // Ensure the size returned from Unsafe.addressSize is correct 43 assertEquals(unsafe.addressSize(), Platform.is32bit() ? 4 : 8); 44 45 // Write the address, read it back and make sure it's the same value 46 long address = unsafe.allocateMemory(addressSize); 47 unsafe.putAddress(address, address); 48 long readAddress = unsafe.getAddress(address); 49 if (addressSize == 4) { 50 readAddress &= 0x00000000FFFFFFFFL; 51 } 52 assertEquals(address, readAddress); 53 unsafe.freeMemory(address); 54 } 55 }