1 /*
2 * Copyright (c) 1997, 2025, 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 #include "oops/arrayOop.hpp"
25 #include "oops/oop.inline.hpp"
26 #include "unittest.hpp"
27 #include "utilities/globalDefinitions.hpp"
28
29 static bool check_max_length_overflow(BasicType type) {
30 julong length = arrayOopDesc::max_array_length(type);
31 julong bytes_per_element = type2aelembytes(type);
32 julong bytes = length * bytes_per_element
33 + arrayOopDesc::base_offset_in_bytes(type);
34 return (julong) (size_t) bytes == bytes;
35 }
36
37 TEST_VM(arrayOopDesc, boolean) {
38 ASSERT_PRED1(check_max_length_overflow, T_BOOLEAN);
39 }
40
41 TEST_VM(arrayOopDesc, char) {
42 ASSERT_PRED1(check_max_length_overflow, T_CHAR);
43 }
44
45 TEST_VM(arrayOopDesc, float) {
46 ASSERT_PRED1(check_max_length_overflow, T_FLOAT);
47 }
48
49 TEST_VM(arrayOopDesc, double) {
50 ASSERT_PRED1(check_max_length_overflow, T_DOUBLE);
51 }
52
53 TEST_VM(arrayOopDesc, byte) {
54 ASSERT_PRED1(check_max_length_overflow, T_BYTE);
55 }
56
57 TEST_VM(arrayOopDesc, short) {
58 ASSERT_PRED1(check_max_length_overflow, T_SHORT);
59 }
60
61 TEST_VM(arrayOopDesc, int) {
62 ASSERT_PRED1(check_max_length_overflow, T_INT);
63 }
64
65 TEST_VM(arrayOopDesc, long) {
66 ASSERT_PRED1(check_max_length_overflow, T_LONG);
67 }
68
69 TEST_VM(arrayOopDesc, object) {
70 ASSERT_PRED1(check_max_length_overflow, T_OBJECT);
71 }
72
73 TEST_VM(arrayOopDesc, array) {
74 ASSERT_PRED1(check_max_length_overflow, T_ARRAY);
75 }
76
77 TEST_VM(arrayOopDesc, narrowOop) {
78 ASSERT_PRED1(check_max_length_overflow, T_NARROWOOP);
79 }
80 // T_VOID and T_ADDRESS are not supported by max_array_length()
81
82 TEST_VM(arrayOopDesc, base_offset) {
83 #ifdef _LP64
84 if (UseCompactObjectHeaders) {
85 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BOOLEAN), 8);
86 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BYTE), 8);
87 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_SHORT), 8);
88 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_CHAR), 8);
89 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_INT), 8);
90 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_FLOAT), 8);
91 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_LONG), 8);
92 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_DOUBLE), 8);
93 if (UseCompressedOops) {
94 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_OBJECT), 8);
95 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_ARRAY), 8);
96 } else {
97 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_OBJECT), 8);
98 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_ARRAY), 8);
99 }
100 } else if (UseCompressedClassPointers) {
101 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BOOLEAN), 16);
102 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BYTE), 16);
103 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_SHORT), 16);
104 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_CHAR), 16);
105 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_INT), 16);
106 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_FLOAT), 16);
107 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_LONG), 16);
108 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_DOUBLE), 16);
109 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_OBJECT), 16);
110 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_ARRAY), 16);
111 } else {
112 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BOOLEAN), 20);
113 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BYTE), 20);
114 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_SHORT), 20);
115 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_CHAR), 20);
116 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_INT), 20);
117 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_FLOAT), 20);
118 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_LONG), 24);
119 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_DOUBLE), 24);
120 if (UseCompressedOops) {
121 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_OBJECT), 20);
122 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_ARRAY), 20);
123 } else {
124 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_OBJECT), 24);
125 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_ARRAY), 24);
126 }
127 }
128 #else
129 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BOOLEAN), 12);
130 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_BYTE), 12);
131 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_SHORT), 12);
132 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_CHAR), 12);
133 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_INT), 12);
134 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_FLOAT), 12);
135 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_LONG), 16);
136 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_DOUBLE), 16);
137 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_OBJECT), 12);
138 EXPECT_EQ(arrayOopDesc::base_offset_in_bytes(T_ARRAY), 12);
139 #endif
140 }