001/*
002 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.jtt.jdk;
024
025import java.lang.reflect.*;
026
027import org.junit.*;
028
029import sun.misc.*;
030
031import com.oracle.graal.jtt.*;
032
033/*
034 */
035public class UnsafeAccess01 extends JTTTest {
036
037    private static int randomValue = 100;
038    private static final Unsafe unsafe;
039    private static final long offset;
040    private static Object staticObject = new TestClass();
041
042    static {
043        unsafe = getUnsafe();
044        Field field = null;
045        try {
046            field = TestClass.class.getDeclaredField("field");
047        } catch (NoSuchFieldException e) {
048        } catch (SecurityException e) {
049        }
050        offset = unsafe.objectFieldOffset(field);
051    }
052
053    private static class TestClass {
054        private int field = 42;
055    }
056
057    public static int test() {
058        final TestClass object = new TestClass();
059        final int value = unsafe.getInt(object, offset);
060        return value;
061    }
062
063    static Unsafe getUnsafe() {
064        try {
065            final Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
066            unsafeField.setAccessible(true);
067            return (Unsafe) unsafeField.get(null);
068        } catch (Exception e) {
069            throw new Error(e);
070        }
071    }
072
073    @Test
074    public void run0() throws Throwable {
075        runTest("test");
076    }
077
078    @Test
079    public void runDiamond() throws Throwable {
080        runTest("testDiamond");
081    }
082
083    public static int testDiamond() {
084
085        final Object object = staticObject;
086        final int oldValue = ((TestClass) object).field;
087
088        if (randomValue == 100) {
089            unsafe.putInt(object, offset, 41);
090        } else {
091            unsafe.putInt(object, offset, 40);
092        }
093        unsafe.putInt(object, offset, 42);
094        return oldValue;
095    }
096}