test/hotspot/jtreg/vmTestbase/nsk/jvmti/RedefineClasses/redefclass016.java

/*
 * Copyright (c) 2003, 2018, 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.
 */

//    THIS TEST IS LINE NUMBER SENSITIVE

package nsk.jvmti.RedefineClasses;

import java.io.*;

public class redefclass016 {

    final static int FAILED = 2;
    final static int JCK_STATUS_BASE = 95;

    static {
        try {
            System.loadLibrary("redefclass016");
        } catch (UnsatisfiedLinkError ule) {
            System.err.println("Could not load redefclass016 library");
            System.err.println("java.library.path:"
                + System.getProperty("java.library.path"));
            throw ule;
        }
    }

    native static void getReady(Class cls, byte bytes[], int magic, int line);
    native static int check();

    public static void main(String args[]) {
        args = nsk.share.jvmti.JVMTITest.commonInit(args);

        // produce JCK-like exit status.
        System.exit(run(args, System.out) + JCK_STATUS_BASE);
    }

    public static int run(String args[], PrintStream out) {
        // Read data from class
        byte[] bytes;
        String fileName =
            redefclass016a.class.getName().replace('.', File.separatorChar) +
            ".class";
        try {
            ClassLoader cl = redefclass016.class.getClassLoader();
            InputStream in = cl.getSystemResourceAsStream(fileName);
            if (in == null) {
                out.println("# Class file \"" + fileName + "\" not found");
                return FAILED;
            }
            bytes = new byte[in.available()];
            in.read(bytes);
            in.close();
        } catch (Exception ex) {
            out.println("# Unexpected exception while reading class file:");
            out.println("# " + ex);
            return FAILED;
        }

        redefclass016a thr = new redefclass016a();
        getReady(redefclass016a.class, bytes, thr.MAGIC_NUMBER, thr.LINE_NUMBER);

        thr.start();
        try {
            thr.join();
        } catch (InterruptedException e) {
            throw new Error("Unexpected " + e);
        }

        return check();
    }
}

class redefclass016a extends Thread {
    final static int LOOP_COUNT = 8;
    final static int MAGIC_NUMBER = 0x12345678;
    final static int LINE_NUMBER = 100;

    public void run() {
        int localVar = 0;
        for (int i = 0; i < LOOP_COUNT; i++) {
            localVar = volatileMethod(); // LINE_NUMBER
        }
    }

    private int volatileMethod() {
        return MAGIC_NUMBER;
    }
}