| /* |
| * Copyright (c) 2013, 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 6910473 |
| * @summary Test that bitLength() is not negative |
| * @author Dmitry Nadezhin |
| */ |
| import java.math.BigInteger; |
| |
| public class BitLengthOverflow { |
| |
| public static void main(String[] args) { |
| try { |
| BigInteger x = BigInteger.ONE.shiftLeft(Integer.MAX_VALUE); // x = pow(2,Integer.MAX_VALUE) |
| if (x.bitLength() != (1L << 31)) { |
| throw new RuntimeException("Incorrect bitLength() " + x.bitLength()); |
| } |
| System.out.println("Surprisingly passed with correct bitLength() " + x.bitLength()); |
| } catch (ArithmeticException e) { |
| // expected |
| System.out.println("Overflow is reported by ArithmeticException, as expected"); |
| } catch (OutOfMemoryError e) { |
| // possible |
| System.err.println("BitLengthOverflow skipped: OutOfMemoryError"); |
| System.err.println("Run jtreg with -javaoption:-Xmx8g"); |
| } |
| } |
| } |