Mercurial > hg > truffle
view test/compiler/intrinsics/unsafe/UnsafeGetAddressTest.java @ 18092:9e2bb00a8191 jdk8u25-b11
Merge
author | coffeys |
---|---|
date | Fri, 01 Aug 2014 10:16:39 +0100 |
parents | 9ab9f254cfe2 |
children |
line wrap: on
line source
/* * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 6653795 * @summary C2 intrinsic for Unsafe.getAddress performs pointer sign extension on 32-bit systems * @run main UnsafeGetAddressTest * */ import sun.misc.Unsafe; import java.lang.reflect.*; public class UnsafeGetAddressTest { private static Unsafe unsafe; public static void main(String[] args) throws Exception { Class c = UnsafeGetAddressTest.class.getClassLoader().loadClass("sun.misc.Unsafe"); Field f = c.getDeclaredField("theUnsafe"); f.setAccessible(true); unsafe = (Unsafe)f.get(c); long address = unsafe.allocateMemory(unsafe.addressSize()); unsafe.putAddress(address, 0x0000000080000000L); // from sun.misc.Unsafe.getAddress' documentation: // "If the native pointer is less than 64 bits wide, it is // extended as an unsigned number to a Java long." result = unsafe.getAddress(address); System.out.printf("1: was 0x%x, expected 0x%x\n", result, 0x0000000080000000L); for (int i = 0; i < 1000000; i++) { result = unsafe.getAddress(address); } // The code has got compiled, check the result now System.out.printf("2: was 0x%x, expected 0x%x\n", result, 0x0000000080000000L); if (result != 0x0000000080000000L) { System.out.println("Test Failed"); System.exit(97); } else { System.out.println("Test Passed"); } } static volatile long result; }