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 * @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 import java.lang.reflect.Field;
45 import java.util.Arrays;
46 import java.util.Comparator;
47 import jdk.internal.misc.Unsafe;
48
49 import jdk.test.lib.Asserts;
50 import jdk.test.lib.Platform;
51 import jdk.test.whitebox.WhiteBox;
52
53 public class BaseOffsets {
54
55 static class LIClass {
56 public int i;
57 }
58
59 static final long INT_OFFSET;
60 static final int INT_ARRAY_OFFSET;
61 static final int LONG_ARRAY_OFFSET;
62 static {
63 WhiteBox WB = WhiteBox.getWhiteBox();
64 if (!Platform.is64bit() || WB.getBooleanVMFlag("UseCompactObjectHeaders")) {
65 INT_OFFSET = 8;
66 INT_ARRAY_OFFSET = 12;
67 LONG_ARRAY_OFFSET = 16;
68 } else if (WB.getBooleanVMFlag("UseCompressedClassPointers")) {
69 INT_OFFSET = 12;
70 INT_ARRAY_OFFSET = 16;
71 LONG_ARRAY_OFFSET = 16;
72 } else {
73 INT_OFFSET = 16;
74 INT_ARRAY_OFFSET = 20;
75 LONG_ARRAY_OFFSET = 24;
76 }
77 }
78
79 static public void main(String[] args) {
80 Unsafe unsafe = Unsafe.getUnsafe();
81 Class c = LIClass.class;
82 Field[] fields = c.getFields();
83 for (int i = 0; i < fields.length; i++) {
84 long offset = unsafe.objectFieldOffset(fields[i]);
85 if (fields[i].getType() == int.class) {
86 Asserts.assertEquals(offset, INT_OFFSET, "Misplaced int field");
87 } else {
88 Asserts.fail("Unexpected field type");
89 }
90 }
91
92 Asserts.assertEquals(unsafe.arrayBaseOffset(boolean[].class), INT_ARRAY_OFFSET, "Misplaced boolean array base");
93 Asserts.assertEquals(unsafe.arrayBaseOffset(byte[].class), INT_ARRAY_OFFSET, "Misplaced byte array base");
94 Asserts.assertEquals(unsafe.arrayBaseOffset(char[].class), INT_ARRAY_OFFSET, "Misplaced char array base");
95 Asserts.assertEquals(unsafe.arrayBaseOffset(short[].class), INT_ARRAY_OFFSET, "Misplaced short array base");
96 Asserts.assertEquals(unsafe.arrayBaseOffset(int[].class), INT_ARRAY_OFFSET, "Misplaced int array base");
97 Asserts.assertEquals(unsafe.arrayBaseOffset(long[].class), LONG_ARRAY_OFFSET, "Misplaced long array base");
98 Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class), INT_ARRAY_OFFSET, "Misplaced float array base");
99 Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class), LONG_ARRAY_OFFSET, "Misplaced double array base");
100 boolean narrowOops = System.getProperty("java.vm.compressedOopsMode") != null ||
101 !Platform.is64bit();
102 int expected_objary_offset = narrowOops ? INT_ARRAY_OFFSET : LONG_ARRAY_OFFSET;
103 Asserts.assertEquals(unsafe.arrayBaseOffset(Object[].class), expected_objary_offset, "Misplaced object array base");
104 }
105 }