1 /* 2 * Copyright (c) 1997, 2011, 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 "utilities/globalDefinitions.hpp" 33 // Unit tests 34 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 (bytes - header_size_in_bytes()) / bytes_per_element == length; 40 } 41 42 bool arrayOopDesc::test_max_array_length() { 43 tty->print_cr("test_max_array_length"); 44 45 assert(check_max_length_overflow(T_BOOLEAN), "size_t overflow for boolean array"); 46 assert(check_max_length_overflow(T_CHAR), "size_t overflow for char array"); 47 assert(check_max_length_overflow(T_FLOAT), "size_t overflow for float array"); 48 assert(check_max_length_overflow(T_DOUBLE), "size_t overflow for double array"); 49 assert(check_max_length_overflow(T_BYTE), "size_t overflow for byte array"); 50 assert(check_max_length_overflow(T_SHORT), "size_t overflow for short array"); 51 assert(check_max_length_overflow(T_INT), "size_t overflow for int array"); 52 assert(check_max_length_overflow(T_LONG), "size_t overflow for long array"); 53 assert(check_max_length_overflow(T_OBJECT), "size_t overflow for object array"); 54 assert(check_max_length_overflow(T_ARRAY), "size_t overflow for array array"); 55 assert(check_max_length_overflow(T_NARROWOOP), "size_t overflow for narrowOop array"); 56 57 // T_VOID and T_ADDRESS are not supported by max_array_length() 58 59 return true; 60 } 61 62 63 #endif //PRODUCT