1 /* 2 * Copyright (c) 2008, 2012, 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 package org.graalvm.compiler.jtt.jdk; 24 25 import jdk.vm.ci.meta.ResolvedJavaMethod; 26 27 import org.junit.Test; 28 29 import sun.misc.Unsafe; 30 31 import org.graalvm.compiler.jtt.JTTTest; 32 33 public class Unsafe_compareAndSwap extends JTTTest { 34 35 static final Unsafe unsafe = UnsafeAccess01.getUnsafe(); 36 static final long valueOffset; 37 static { 38 try { 39 valueOffset = unsafe.objectFieldOffset(Unsafe_compareAndSwap.class.getDeclaredField("value")); 40 } catch (Exception ex) { 41 throw new Error(ex); 42 } 43 } 44 45 public static String test(Unsafe_compareAndSwap u, Object o, String expected, String newValue) { 46 // First arg is not an array - can use a field write barrier 47 unsafe.compareAndSwapObject(u, valueOffset, expected, newValue); 48 // Not known if first arg is an array - different write barrier may be used 49 unsafe.compareAndSwapObject(o, valueOffset, expected, newValue); 50 51 return instance.value; 52 } 53 54 private String value; 55 56 private static final Unsafe_compareAndSwap instance = new Unsafe_compareAndSwap(); 57 58 @Override 59 protected void before(ResolvedJavaMethod m) { 60 instance.value = "a"; 61 } 62 63 @Test 64 public void run0() throws Throwable { 65 runTest("test", instance, instance, "a", "b"); 66 } 67 }