1 /* 2 * Copyright (c) 2014, 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 * @bug 6653795 27 * @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems 28 * @modules java.base/jdk.internal.misc 29 * @run main UnsafeGetAddressTest 30 * 31 */ 32 33 import jdk.internal.misc.Unsafe; 34 import java.lang.reflect.*; 35 36 public class UnsafeGetAddressTest { 37 private static Unsafe unsafe; 38 39 public static void main(String[] args) throws Exception { 40 Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("jdk.internal.misc.Unsafe"); 41 Field f = c.getDeclaredField("theUnsafe"); 42 f.setAccessible(true); 43 unsafe = (Unsafe)f.get(c); 44 45 long address = unsafe.allocateMemory(unsafe.addressSize()); 46 unsafe.putAddress(address, 0x0000000080000000L); 47 // from jdk.internal.misc.Unsafe.getAddress' documentation: 48 // "If the native pointer is less than 64 bits wide, it is 49 // extended as an unsigned number to a Java long." 50 result = unsafe.getAddress(address); 51 System.out.printf("1: was 0x%x, expected 0x%x\n", result, 52 0x0000000080000000L); 53 for (int i = 0; i < 1000000; i++) { 54 result = unsafe.getAddress(address); 55 } 56 57 // The code has got compiled, check the result now 58 System.out.printf("2: was 0x%x, expected 0x%x\n", result, 59 0x0000000080000000L); 60 if (result != 0x0000000080000000L) { 61 System.out.println("Test Failed"); 62 System.exit(97); 63 } else { 64 System.out.println("Test Passed"); 65 } 66 } 67 static volatile long result; 68 } 69