86 lines
2.8 KiB
Java
86 lines
2.8 KiB
Java
/*
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* Copyright (c) 1998, 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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/* @test
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@bug 4098742
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@summary Test biginteger modpow method
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@author Michael McCloskey
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@run main/othervm ModPowPowersof2
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*/
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import java.math.BigInteger;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.io.File;
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import java.io.IOException;
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/**
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* This class tests to see if using modPow on a power
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* of two crashes the vm
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*
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*/
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public class ModPowPowersof2 {
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public static void main(String args[]) throws Exception {
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// Construct a command that runs the test in other vm
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String[] command = new String[4];
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int n = 0;
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command[n++] = System.getProperty("java.home") + File.separator +
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"bin" + File.separator + "java";
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if (System.getProperty("java.class.path") != null) {
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command[n++] = "-classpath";
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command[n++] = System.getProperty("java.class.path");
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}
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command[n++] = "ModPowPowersof2$ModTester";
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// Exec another vm to run test in
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Process p = null;
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p = Runtime.getRuntime().exec(command);
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// Read the result to determine if test failed
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BufferedReader in = new BufferedReader(new InputStreamReader(
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p.getInputStream()));
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String s;
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s = in.readLine();
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if (s == null)
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throw new RuntimeException("ModPow causes vm crash");
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}
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public static class ModTester {
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public static void main(String [] args) {
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BigInteger two = BigInteger.valueOf(2);
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BigInteger four = BigInteger.valueOf(4);
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two.modPow(two, BigInteger.valueOf(4));
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two.modPow(two, BigInteger.valueOf(8));
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two.modPow(four, BigInteger.valueOf(8));
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System.out.println("success");
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}
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}
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}
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