1 /*
2 * Copyright (c) 1997, 2012, 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 #include "precompiled.hpp"
26
27 /////////////// Unit tests ///////////////
28
29 #ifndef PRODUCT
30
31 #include "oops/arrayOop.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "utilities/globalDefinitions.hpp"
34
check_max_length_overflow(BasicType type)35 bool arrayOopDesc::check_max_length_overflow(BasicType type) {
36 julong length = max_array_length(type);
37 julong bytes_per_element = type2aelembytes(type);
38 julong bytes = length * bytes_per_element + header_size_in_bytes();
39 return (julong)(size_t)bytes == bytes;
40 }
41
test_max_array_length()42 void arrayOopDesc::test_max_array_length() {
43 assert(check_max_length_overflow(T_BOOLEAN), "size_t overflow for boolean array");
44 assert(check_max_length_overflow(T_CHAR), "size_t overflow for char array");
45 assert(check_max_length_overflow(T_FLOAT), "size_t overflow for float array");
46 assert(check_max_length_overflow(T_DOUBLE), "size_t overflow for double array");
47 assert(check_max_length_overflow(T_BYTE), "size_t overflow for byte array");
48 assert(check_max_length_overflow(T_SHORT), "size_t overflow for short array");
49 assert(check_max_length_overflow(T_INT), "size_t overflow for int array");
50 assert(check_max_length_overflow(T_LONG), "size_t overflow for long array");
51 assert(check_max_length_overflow(T_OBJECT), "size_t overflow for object array");
52 assert(check_max_length_overflow(T_ARRAY), "size_t overflow for array array");
53 assert(check_max_length_overflow(T_NARROWOOP), "size_t overflow for narrowOop array");
54
55 // T_VOID and T_ADDRESS are not supported by max_array_length()
56 }
57
58
59 #endif //PRODUCT
60