Mercurial > hg > openjdk > lambda > jdk
view test/java/math/BigInteger/ExtremeShiftingTests.java @ 10542:0734e1584d9d
6910473: java.math.BigInteger.bitLength() may return negative "int" on large numbers
8021203: BigInteger.doubleValue/floatValue returns 0.0 instead of Infinity
8021204: Constructor BigInteger(String val, int radix) doesn't detect overflow
8022780: Incorrect BigInteger division because of MutableBigInteger.bitLength() overflow
Summary: Prevent construction of overflowed BigIntegers.
Reviewed-by: bpb, darcy, psandoz
Contributed-by: Dmitry Nadezhin <dmitry.nadezhin@oracle.com>
author | bpb |
---|---|
date | Wed, 30 Oct 2013 17:45:12 -0700 |
parents | 00cd9dc3c2b5 |
children |
line wrap: on
line source
/* * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @bug 6371401 * @summary Tests of shiftLeft and shiftRight on Integer.MIN_VALUE * @author Joseph D. Darcy */ import java.math.BigInteger; import static java.math.BigInteger.*; public class ExtremeShiftingTests { public static void main(String... args) { BigInteger bi = ONE.shiftLeft(Integer.MIN_VALUE); if (!bi.equals(ZERO)) throw new RuntimeException("1 << " + Integer.MIN_VALUE); bi = ZERO.shiftLeft(Integer.MIN_VALUE); if (!bi.equals(ZERO)) throw new RuntimeException("0 << " + Integer.MIN_VALUE); bi = BigInteger.valueOf(-1); bi = bi.shiftLeft(Integer.MIN_VALUE); if (!bi.equals(BigInteger.valueOf(-1))) throw new RuntimeException("-1 << " + Integer.MIN_VALUE); try { ONE.shiftRight(Integer.MIN_VALUE); throw new RuntimeException("1 >> " + Integer.MIN_VALUE); } catch (ArithmeticException ae) { ; // Expected } bi = ZERO.shiftRight(Integer.MIN_VALUE); if (!bi.equals(ZERO)) throw new RuntimeException("0 >> " + Integer.MIN_VALUE); try { BigInteger.valueOf(-1).shiftRight(Integer.MIN_VALUE); throw new RuntimeException("-1 >> " + Integer.MIN_VALUE); } catch (ArithmeticException ae) { ; // Expected } } }