1 /* 2 * Copyright (c) 2014, 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 * @bug 6653795 27 * @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems 28 * @run main UnsafeGetAddressTest 29 * 30 */ 31 32 import sun.misc.Unsafe; 33 import java.lang.reflect.*; 34 35 public class UnsafeGetAddressTest { 36 private static Unsafe unsafe; 37 38 public static void main(String[] args) throws Exception { 39 Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("sun.misc.Unsafe"); 40 Field f = c.getDeclaredField("theUnsafe"); 41 f.setAccessible(true); 42 unsafe = (Unsafe)f.get(c); 43 44 long address = unsafe.allocateMemory(unsafe.addressSize()); 45 unsafe.putAddress(address, 0x0000000080000000L); 46 // from sun.misc.Unsafe.getAddress' documentation: 47 // "If the native pointer is less than 64 bits wide, it is 48 // extended as an unsigned number to a Java long." 49 result = unsafe.getAddress(address); 50 System.out.printf("1: was 0x%x, expected 0x%x\n", result, 51 0x0000000080000000L); 52 for (int i = 0; i < 1000000; i++) { 53 result = unsafe.getAddress(address); 54 } 55 56 // The code has got compiled, check the result now 57 System.out.printf("2: was 0x%x, expected 0x%x\n", result, 58 0x0000000080000000L); 59 if (result != 0x0000000080000000L) { 60 System.out.println("Test Failed"); 61 System.exit(97); 62 } else { 63 System.out.println("Test Passed"); 64 } 65 } 66 static volatile long result; 67 } 68