/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

 * 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.

 *

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 */

/*

 * @test

 * @bug 8165246 8010319

 * @summary Test has_previous_versions flag and processing during class unloading.

 * @requires vm.opt.final.ClassUnloading

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 * @modules java.compiler

 *          java.instrument

 *          jdk.jartool/sun.tools.jar

 * @run main RedefineClassHelper

 * @run main/othervm RedefinePreviousVersions test

 */

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

// package access top-level classes to avoid problem with RedefineClassHelper

// and nested types.

class RedefinePreviousVersions_B { }

class RedefinePreviousVersions_Running {

    public static volatile boolean stop = false;

    public static volatile boolean running = false;

    static void localSleep() {

        try {

            Thread.sleep(10); // sleep for 10 ms

        } catch(InterruptedException ie) {

        }

    }

    public static void infinite() {

        running = true;

        while (!stop) { localSleep(); }

    }

}

public class RedefinePreviousVersions {

    public static String newB =

                "class RedefinePreviousVersions_B {" +

                "}";

    public static String newRunning =

        "class RedefinePreviousVersions_Running {" +

        "    public static volatile boolean stop = true;" +

        "    public static volatile boolean running = true;" +

        "    static void localSleep() { }" +

        "    public static void infinite() { }" +

        "}";

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

        if (args.length > 0) {

            // java -javaagent:redefineagent.jar -Xlog:stuff RedefinePreviousVersions

            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( "-javaagent:redefineagent.jar",

               "-Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace",

               "RedefinePreviousVersions");

            new OutputAnalyzer(pb.start())

              .shouldContain("Class unloading: has_previous_versions = false")

              .shouldContain("Class unloading: has_previous_versions = true")

              .shouldHaveExitValue(0);

            return;

        }

        // Redefine a class and create some garbage

        // Since there are no methods running, the previous version is never added to the

        // previous_version_list and the flag _has_previous_versions should stay false

        RedefineClassHelper.redefineClass(RedefinePreviousVersions_B.class, newB);

        for (int i = 0; i < 10 ; i++) {

            String s = new String("some garbage");

            System.gc();

        }

        // Start a class that has a method running

        new Thread() {

            public void run() {

                RedefinePreviousVersions_Running.infinite();

            }

        }.start();

        while (!RedefinePreviousVersions_Running.running) {

            Thread.sleep(10); // sleep for 10 ms

        }

        // Since a method of newRunning is running, this class should be added to the previous_version_list

        // of Running, and _has_previous_versions should return true at class unloading.

        RedefineClassHelper.redefineClass(RedefinePreviousVersions_Running.class, newRunning);

        for (int i = 0; i < 10 ; i++) {

            String s = new String("some garbage");

            System.gc();

        }

        // purge should clean everything up, except Xcomp it might not.

        RedefinePreviousVersions_Running.stop = true;

        for (int i = 0; i < 10 ; i++) {

            String s = new String("some garbage");

            System.gc();

        }

    }

}