GetPutInt.java revision 8013:f4b8d39bd2a7 
1/*
2 * Copyright (c) 2015, 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
24/*
25 * @test
26 * @library /testlibrary
27 * @modules java.base/sun.misc
28 *          java.management
29 * @run main GetPutInt
30 */
31
32import java.lang.reflect.Field;
33import com.oracle.java.testlibrary.*;
34import sun.misc.Unsafe;
35import static com.oracle.java.testlibrary.Asserts.*;
36
37public class GetPutInt {
38    public static void main(String args[]) throws Exception {
39        Unsafe unsafe = Utils.getUnsafe();
40        Test t = new Test();
41        Field field = Test.class.getField("i");
42
43        long offset = unsafe.objectFieldOffset(field);
44        assertEquals(-1, unsafe.getInt(t, offset));
45        unsafe.putInt(t, offset, 0);
46        assertEquals(0, unsafe.getInt(t, offset));
47
48        long address = unsafe.allocateMemory(8);
49        unsafe.putInt(address, 1);
50        assertEquals(1, unsafe.getInt(address));
51        unsafe.freeMemory(address);
52
53        int arrayInt[] = { -1, 0, 1, 2 };
54        int scale = unsafe.arrayIndexScale(arrayInt.getClass());
55        offset = unsafe.arrayBaseOffset(arrayInt.getClass());
56        for (int i = 0; i < arrayInt.length; i++) {
57            assertEquals(unsafe.getInt(arrayInt, offset), arrayInt[i]);
58            offset += scale;
59        }
60    }
61
62    static class Test {
63        public int i = -1;
64    }
65}
66