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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8164692
 * @summary Redefine previous_versions count goes negative
 * @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 -javaagent:redefineagent.jar -Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace RedefineCount
 */
public class RedefineCount {

    public static String newB =
                "class RedefineCount$B {" +
                "}";

    static class B { }

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

        // 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 count should stay zero and not go negative
        RedefineClassHelper.redefineClass(B.class, newB);

        for (int i = 0; i < 20 ; i++) {
            String s = new String("some garbage");
            System.gc();
        }
    }
}