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