1 /*
2 * Copyright (c) 2022, 2026, 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=with-coops
26 * @library /test/lib /
27 * @requires vm.bits == "64"
28 * @modules java.base/jdk.internal.misc
29 * java.management
30 * @build jdk.test.whitebox.WhiteBox
31 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
32 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseCompressedOops -XX:-UseCompactObjectHeaders BaseOffsets
33 */
34
35 /*
36 * @test id=no-coops
37 * @library /test/lib /
38 * @requires vm.bits == "64"
39 * @modules java.base/jdk.internal.misc
40 * java.management
41 * @build jdk.test.whitebox.WhiteBox
42 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
43 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedOops -XX:-UseCompactObjectHeaders BaseOffsets
44 */
45
46 /*
47 * @test id=with-coop-with-coh
48 * @library /test/lib /
49 * @requires vm.bits == "64"
50 * @modules java.base/jdk.internal.misc
51 * java.management
52 * @build jdk.test.whitebox.WhiteBox
53 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
54 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseCompressedOops -XX:+UseCompactObjectHeaders BaseOffsets
55 */
56
57 /*
58 * @test id=no-coops-with-coh
59 * @library /test/lib /
60 * @requires vm.bits == "64"
61 * @modules java.base/jdk.internal.misc
62 * java.management
63 * @build jdk.test.whitebox.WhiteBox
64 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
65 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedOops -XX:+UseCompactObjectHeaders BaseOffsets
66 */
67
68 /*
69 * @test id=32bit
70 * @library /test/lib /
71 * @requires vm.bits == "32"
72 * @modules java.base/jdk.internal.misc
73 * java.management
74 * @build jdk.test.whitebox.WhiteBox
75 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
76 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI BaseOffsets
77 */
78
79 import java.lang.reflect.Field;
80 import java.util.Arrays;
81 import java.util.Comparator;
82 import jdk.internal.misc.Unsafe;
83
84 import jdk.test.lib.Asserts;
85 import jdk.test.lib.Platform;
86 import jdk.test.whitebox.WhiteBox;
87
88 public class BaseOffsets {
89
90 static class LIClass {
91 public int i;
92 }
93
94 public static final WhiteBox WB = WhiteBox.getWhiteBox();
95
96 static final long INT_OFFSET;
97 static final long INT_ARRAY_OFFSET;
98 static final long LONG_ARRAY_OFFSET;
99 static {
100 if (!Platform.is64bit() || WB.getBooleanVMFlag("UseCompactObjectHeaders")) {
101 INT_OFFSET = 4;
102 INT_ARRAY_OFFSET = 8;
103 LONG_ARRAY_OFFSET = 8;
104 } else {
105 INT_OFFSET = 12;
106 INT_ARRAY_OFFSET = 16;
107 LONG_ARRAY_OFFSET = 16;
108 }
109 }
110
111 static public void main(String[] args) {
112 Unsafe unsafe = Unsafe.getUnsafe();
113 Class c = LIClass.class;
114 Field[] fields = c.getFields();
115 for (int i = 0; i < fields.length; i++) {
116 long offset = unsafe.objectFieldOffset(fields[i]);
117 if (fields[i].getType() == int.class) {
118 Asserts.assertEquals(offset, INT_OFFSET, "Misplaced int field");
119 } else {
120 Asserts.fail("Unexpected field type");
121 }
122 }
123
124 Asserts.assertEquals(unsafe.arrayBaseOffset(boolean[].class), INT_ARRAY_OFFSET, "Misplaced boolean array base");
125 Asserts.assertEquals(unsafe.arrayBaseOffset(byte[].class), INT_ARRAY_OFFSET, "Misplaced byte array base");
126 Asserts.assertEquals(unsafe.arrayBaseOffset(char[].class), INT_ARRAY_OFFSET, "Misplaced char array base");
127 Asserts.assertEquals(unsafe.arrayBaseOffset(short[].class), INT_ARRAY_OFFSET, "Misplaced short array base");
128 Asserts.assertEquals(unsafe.arrayBaseOffset(int[].class), INT_ARRAY_OFFSET, "Misplaced int array base");
129 Asserts.assertEquals(unsafe.arrayBaseOffset(long[].class), LONG_ARRAY_OFFSET, "Misplaced long array base");
130 Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class), INT_ARRAY_OFFSET, "Misplaced float array base");
131 Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class), LONG_ARRAY_OFFSET, "Misplaced double array base");
132 boolean narrowOops = System.getProperty("java.vm.compressedOopsMode") != null ||
133 !Platform.is64bit();
134 long expected_objary_offset = narrowOops ? INT_ARRAY_OFFSET : LONG_ARRAY_OFFSET;
135 Asserts.assertEquals(unsafe.arrayBaseOffset(Object[].class), expected_objary_offset, "Misplaced object array base");
136 }
137 }