1 /*

     2  * Copyright (c) 2013, 2019, 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

    26  * @bug 8021204

    27  * @summary Test constructor BigInteger(String val, int radix) on very long string

    28  * @ignore This test has huge memory requirements

    29  * @run main/othervm -Xshare:off -Xmx8g StringConstructorOverflow

    30  * @author Dmitry Nadezhin

    31  */

    32 import java.math.BigInteger;

    33 

    34 public class StringConstructorOverflow {

    35 

    36     // String with hexadecimal value pow(2,pow(2,34))+1

    37     private static String makeLongHexString() {

    38         StringBuilder sb = new StringBuilder();

    39         sb.append('1');

    40         for (int i = 0; i < (1 << 30) - 1; i++) {

    41             sb.append('0');

    42         }

    43         sb.append('1');

    44         return sb.toString();

    45     }

    46 

    47     public static void main(String[] args) {

    48         try {

    49             BigInteger bi = new BigInteger(makeLongHexString(), 16);

    50             if (bi.compareTo(BigInteger.ONE) <= 0) {

    51                 throw new RuntimeException("Incorrect result " + bi.toString());

    52             }

    53         } catch (ArithmeticException e) {

    54             // expected

    55             System.out.println("Overflow is reported by ArithmeticException, as expected");

    56         } catch (OutOfMemoryError e) {

    57             // possible

    58             System.err.println("StringConstructorOverflow skipped: OutOfMemoryError");

    59             System.err.println("Run jtreg with -javaoption:-Xmx8g");

    60         }

    61     }

    62 }