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 */
23package org.graalvm.compiler.jtt.jdk;
24
25import java.lang.reflect.Field;
26
27import org.junit.Test;
28
29import sun.misc.Unsafe;
30
31import org.graalvm.compiler.jtt.JTTTest;
32
33/*
34 */
35public class UnsafeAccess01 extends JTTTest {
36
37    private static int randomValue = 100;
38    private static final Unsafe unsafe;
39    private static final long offset;
40    private static Object staticObject = new TestClass();
41
42    static {
43        unsafe = getUnsafe();
44        Field field = null;
45        try {
46            field = TestClass.class.getDeclaredField("field");
47        } catch (NoSuchFieldException e) {
48        } catch (SecurityException e) {
49        }
50        offset = unsafe.objectFieldOffset(field);
51    }
52
53    private static class TestClass {
54        private int field = 42;
55    }
56
57    public static int test() {
58        final TestClass object = new TestClass();
59        final int value = unsafe.getInt(object, offset);
60        return value;
61    }
62
63    static Unsafe getUnsafe() {
64        try {
65            final Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
66            unsafeField.setAccessible(true);
67            return (Unsafe) unsafeField.get(null);
68        } catch (Exception e) {
69            throw new Error(e);
70        }
71    }
72
73    @Test
74    public void run0() throws Throwable {
75        runTest("test");
76    }
77
78    @Test
79    public void runDiamond() throws Throwable {
80        runTest("testDiamond");
81    }
82
83    public static int testDiamond() {
84
85        final Object object = staticObject;
86        final int oldValue = ((TestClass) object).field;
87
88        if (randomValue == 100) {
89            unsafe.putInt(object, offset, 41);
90        } else {
91            unsafe.putInt(object, offset, 40);
92        }
93        unsafe.putInt(object, offset, 42);
94        return oldValue;
95    }
96}
97