66 lines
2.4 KiB
Java
66 lines
2.4 KiB
Java
/*
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* Copyright (c) 2013, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6910473 8272541
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* @summary Test that bitLength() is not negative
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* @author Dmitry Nadezhin
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*/
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import java.math.BigInteger;
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import java.util.function.Supplier;
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public class BitLengthOverflow {
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private static void test(Supplier<BigInteger> s) {
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try {
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BigInteger x = s.get();
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System.out.println("Surprisingly passed with correct bitLength() " +
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x.bitLength());
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} catch (ArithmeticException e) {
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// expected
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System.out.println("Overflow reported by ArithmeticException, as expected");
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} catch (OutOfMemoryError e) {
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// possible
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System.err.println("BitLengthOverflow skipped: OutOfMemoryError");
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System.err.println("Run jtreg with -javaoption:-Xmx8g");
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}
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}
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public static void main(String[] args) {
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test(() -> {
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// x = pow(2,Integer.MAX_VALUE)
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BigInteger x = BigInteger.ONE.shiftLeft(Integer.MAX_VALUE);
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if (x.bitLength() != (1L << 31)) {
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throw new RuntimeException("Incorrect bitLength() " +
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x.bitLength());
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}
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return x;
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});
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test(() -> {
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BigInteger a = BigInteger.ONE.shiftLeft(1073742825);
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BigInteger b = BigInteger.ONE.shiftLeft(1073742825);
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return a.multiply(b);
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});
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}
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}
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