Java example source code file (Test6559156.java)

This example Java source code file (Test6559156.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

failed, n_tests, runtimeexception, test6559156

The Test6559156.java Java example source code

/*
 * Copyright (c) 2011, 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 6559156
 * @summary Server compiler generates bad code for "<= Integer.MAX_VALUE" expression
 *
 * @run main Test6559156
 */

public class Test6559156 {

    static final int N_TESTS = 1000000;

    public static void main(String[] args) throws Exception {

        /*
         * If MAX_VALUE is changed to MAX_VALUE - 1 below, the test passes
         * because (apparently) bad code is only generated when comparing
         * <= MAX_VALUE in the doTest method.
         */
        Test6559156 test = new Test6559156();
        for (int i = 0; i < N_TESTS; i += 1) {
            test.doTest1(10, Integer.MAX_VALUE, i);
            test.doTest2(10, Integer.MAX_VALUE, i);
        }
        System.out.println("No failure");
    }

    void doTest1(int expected, int max, int i) {
        int counted;
        for (counted = 0;
             (counted <= max) && (counted < expected);
             counted += 1) {
        }
        if (counted != expected) {
            throw new RuntimeException("Failed test1 iteration=" + i +
                                       " max=" + max +
                                       " counted=" + counted +
                                       " expected=" + expected);
        }
    }

    void doTest2(int expected, int max, int i) {
        int counted;
        for (counted = 0;
             // change test sequence.
             (counted < expected) && (counted <= max);
             counted += 1) {
        }
        if (counted != expected) {
            throw new RuntimeException("Failed test1 iteration=" + i +
                                       " max=" + max +
                                       " counted=" + counted +
                                       " expected=" + expected);
        }
    }
}