1 /*
2 * Copyright (c) 2022, 2023, 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 * @build jdk.test.whitebox.WhiteBox
30 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
31 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI BaseOffsets
32 */
33 /*
34 * @test id=no-coops
35 * @library /test/lib /
36 * @requires vm.bits == "64"
37 * @modules java.base/jdk.internal.misc
38 * java.management
39 * @build jdk.test.whitebox.WhiteBox
40 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
41 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedOops BaseOffsets
42 */
43 /*
44 * @test id=no-ccp
45 * @library /test/lib /
46 * @requires vm.bits == "64"
47 * @modules java.base/jdk.internal.misc
48 * java.management
49 * @build jdk.test.whitebox.WhiteBox
50 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
51 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedClassPointers BaseOffsets
52 */
53 /*
54 * @test id=no-compact-headers
55 * @library /test/lib /
56 * @requires vm.bits == "64"
57 * @modules java.base/jdk.internal.misc
58 * java.management
59 * @build jdk.test.whitebox.WhiteBox
60 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
61 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders BaseOffsets
62 */
63
64 import java.lang.reflect.Field;
65 import java.util.Arrays;
66 import java.util.Comparator;
67 import jdk.internal.misc.Unsafe;
68
69 import jdk.test.lib.Asserts;
70 import jdk.test.lib.Platform;
71 import jdk.test.whitebox.WhiteBox;
72
73 public class BaseOffsets {
74
75 static class LIClass {
76 public int i;
77 }
78
79 public static final WhiteBox WB = WhiteBox.getWhiteBox();
80
81 static final long INT_OFFSET;
82 static final int INT_ARRAY_OFFSET;
83 static final int LONG_ARRAY_OFFSET;
84 static {
85 if (!Platform.is64bit()) {
86 INT_OFFSET = 8;
87 INT_ARRAY_OFFSET = 12;
88 LONG_ARRAY_OFFSET = 16;
89 } else if (WB.getBooleanVMFlag("UseCompactObjectHeaders")) {
90 INT_OFFSET = 8;
91 INT_ARRAY_OFFSET = 12;
92 LONG_ARRAY_OFFSET = 16;
93 } else if (WB.getBooleanVMFlag("UseCompressedClassPointers")) {
94 INT_OFFSET = 12;
95 INT_ARRAY_OFFSET = 16;
96 LONG_ARRAY_OFFSET = 16;
97 } else {
98 INT_OFFSET = 16;
99 INT_ARRAY_OFFSET = 20;
100 LONG_ARRAY_OFFSET = 24;
101 }
102 }
103
104 static public void main(String[] args) {
105 Unsafe unsafe = Unsafe.getUnsafe();
106 Class c = LIClass.class;
107 Field[] fields = c.getFields();
108 for (int i = 0; i < fields.length; i++) {
109 long offset = unsafe.objectFieldOffset(fields[i]);
110 if (fields[i].getType() == int.class) {
111 Asserts.assertEquals(offset, INT_OFFSET, "Misplaced int field");
112 } else {
113 Asserts.fail("Unexpected field type");
114 }
115 }
116
117 Asserts.assertEquals(unsafe.arrayBaseOffset(boolean[].class), INT_ARRAY_OFFSET, "Misplaced boolean array base");
118 Asserts.assertEquals(unsafe.arrayBaseOffset(byte[].class), INT_ARRAY_OFFSET, "Misplaced byte array base");
119 Asserts.assertEquals(unsafe.arrayBaseOffset(char[].class), INT_ARRAY_OFFSET, "Misplaced char array base");
120 Asserts.assertEquals(unsafe.arrayBaseOffset(short[].class), INT_ARRAY_OFFSET, "Misplaced short array base");
121 Asserts.assertEquals(unsafe.arrayBaseOffset(int[].class), INT_ARRAY_OFFSET, "Misplaced int array base");
122 Asserts.assertEquals(unsafe.arrayBaseOffset(long[].class), LONG_ARRAY_OFFSET, "Misplaced long array base");
123 Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class), INT_ARRAY_OFFSET, "Misplaced float array base");
124 Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class), LONG_ARRAY_OFFSET, "Misplaced double array base");
125 boolean narrowOops = System.getProperty("java.vm.compressedOopsMode") != null ||
126 !Platform.is64bit();
127 int expected_objary_offset = narrowOops ? INT_ARRAY_OFFSET : LONG_ARRAY_OFFSET;
128 Asserts.assertEquals(unsafe.arrayBaseOffset(Object[].class), expected_objary_offset, "Misplaced object array base");
129 }
130 }