1 /* 2 * Copyright (c) 2015, 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 /testlibrary 28 * @modules java.base/sun.misc 29 * java.management 30 * @run main GetPutAddress 31 */ 32 33 import com.oracle.java.testlibrary.*; 34 import sun.misc.Unsafe; 35 import static com.oracle.java.testlibrary.Asserts.*; 36 37 public class GetPutAddress { 38 public static void main(String args[]) throws Exception { 39 Unsafe unsafe = Utils.getUnsafe(); 40 int addressSize = unsafe.addressSize(); 41 // Ensure the size returned from Unsafe.addressSize is correct 42 assertEquals(unsafe.addressSize(), Platform.is32bit() ? 4 : 8); 43 44 // Write the address, read it back and make sure it's the same value 45 long address = unsafe.allocateMemory(addressSize); 46 unsafe.putAddress(address, address); 47 long readAddress = unsafe.getAddress(address); 48 if (addressSize == 4) { 49 readAddress &= 0x00000000FFFFFFFFL; 50 } 51 assertEquals(address, readAddress); 52 unsafe.freeMemory(address); 53 } 54 }