1 /*
2 * Copyright (c) 2022, 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 id=default
26 * @library /test/lib
27 * @modules java.base/jdk.internal.misc
28 * java.management
29 * @run main/othervm BaseOffsets
30 */
31 /*
32 * @test id=no-coops
33 * @library /test/lib
34 * @requires vm.bits == "64"
35 * @modules java.base/jdk.internal.misc
36 * java.management
37 * @run main/othervm -XX:-UseCompressedOops BaseOffsets
38 */
39
40 import java.lang.reflect.Field;
41 import java.util.Arrays;
42 import java.util.Comparator;
43 import jdk.internal.misc.Unsafe;
44
45 import jdk.test.lib.Asserts;
46 import jdk.test.lib.Platform;
47
48 public class BaseOffsets {
49
50 static class LIClass {
51 public int i;
52 }
53
54 // @0: 8 byte header, @8: int field
55 static final long INT_OFFSET = 8L;
56
57 static public void main(String[] args) {
58 Unsafe unsafe = Unsafe.getUnsafe();
59 Class c = LIClass.class;
60 Field[] fields = c.getFields();
61 for (int i = 0; i < fields.length; i++) {
62 long offset = unsafe.objectFieldOffset(fields[i]);
63 if (fields[i].getType() == int.class) {
64 Asserts.assertEquals(offset, INT_OFFSET, "Misplaced int field");
65 } else {
66 Asserts.fail("Unexpected field type");
67 }
68 }
69
70 Asserts.assertEquals(unsafe.arrayBaseOffset(boolean[].class), 12, "Misplaced boolean array base");
71 Asserts.assertEquals(unsafe.arrayBaseOffset(byte[].class), 12, "Misplaced byte array base");
72 Asserts.assertEquals(unsafe.arrayBaseOffset(char[].class), 12, "Misplaced char array base");
73 Asserts.assertEquals(unsafe.arrayBaseOffset(short[].class), 12, "Misplaced short array base");
74 Asserts.assertEquals(unsafe.arrayBaseOffset(int[].class), 12, "Misplaced int array base");
75 Asserts.assertEquals(unsafe.arrayBaseOffset(long[].class), 16, "Misplaced long array base");
76 Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class), 12, "Misplaced float array base");
77 Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class), 16, "Misplaced double array base");
78 boolean narrowOops = System.getProperty("java.vm.compressedOopsMode") != null ||
79 !Platform.is64bit();
80 int expected_objary_offset = narrowOops ? 12 : 16;
81 Asserts.assertEquals(unsafe.arrayBaseOffset(Object[].class), expected_objary_offset, "Misplaced object array base");
82 }
83 }