jdk-24/test/hotspot/jtreg/serviceability/jvmti/RedefineClasses/RedefineRunningMethods.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 *
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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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8055008 8197901 8010319
 * @summary Redefine EMCP and non-EMCP methods that are running in an infinite loop
 * @requires vm.jvmti
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 * @modules java.compiler
 *          java.instrument
 *          jdk.jartool/sun.tools.jar
 * @run main RedefineClassHelper
 * @compile RedefineRunningMethods.java
 * @run main/othervm/timeout=180
 *         -javaagent:redefineagent.jar
 *         -Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace,class+loader+data=debug,safepoint+cleanup,gc+phases=debug:rt.log
 *         RedefineRunningMethods
 */


// package access top-level class to avoid problem with RedefineClassHelper
// and nested types.
class RedefineRunningMethods_B {
    static int count1 = 0;
    static int count2 = 0;
    public static volatile boolean stop = false;
    static void localSleep() {
        try{
            Thread.currentThread().sleep(10);//sleep for 10 ms
        } catch(InterruptedException ie) {
        }
    }

    public static void infinite() {
        while (!stop) { count1++; localSleep(); }
    }
    public static void infinite_emcp() {
        while (!stop) { count2++; localSleep(); }
    }
}

public class RedefineRunningMethods {

    public static String newB = """
                class RedefineRunningMethods_B {
                    static int count1 = 0;
                    static int count2 = 0;
                    public static volatile boolean stop = false;
                    static void localSleep() {
                        try {
                            Thread.currentThread().sleep(10);
                        } catch(InterruptedException ie) {
                        }
                    }
                    public static void infinite() {
                        System.out.println("infinite called");
                    }
                    public static void infinite_emcp() {
                        while (!stop) { count2++; localSleep(); }
                    }
                }
                """;

    public static String evenNewerB = """
                class RedefineRunningMethods_B {
                    static int count1 = 0;
                    static int count2 = 0;
                    public static volatile boolean stop = false;
                    static void localSleep() {
                        try {
                            Thread.currentThread().sleep(1);
                        } catch(InterruptedException ie) {
                        }
                    }
                    public static void infinite() { }
                    public static void infinite_emcp() {
                        System.out.println("infinite_emcp now obsolete called");
                    }
                }
                """;


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

        var t1 = Thread.ofPlatform().start(RedefineRunningMethods_B::infinite);
        var t1v = Thread.ofVirtual().start(RedefineRunningMethods_B::infinite);
        var t2 = Thread.ofPlatform().start(RedefineRunningMethods_B::infinite_emcp);
        var t2v = Thread.ofVirtual().start(RedefineRunningMethods_B::infinite);

        RedefineClassHelper.redefineClass(RedefineRunningMethods_B.class, newB);

        System.gc();

        RedefineRunningMethods_B.infinite();

        // Start a thread with the second version of infinite_emcp running
        var t3 = Thread.ofPlatform().start(RedefineRunningMethods_B::infinite_emcp);
        var t3v = Thread.ofVirtual().start(RedefineRunningMethods_B::infinite_emcp);


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

        RedefineClassHelper.redefineClass(RedefineRunningMethods_B.class, evenNewerB);
        System.gc();

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

        RedefineRunningMethods_B.infinite_emcp();

        // purge should clean everything up.
        RedefineRunningMethods_B.stop = true;

        for (int i = 0; i < 20 ; i++) {
            RedefineRunningMethods_B.infinite();
            String s = new String("some garbage");
            System.gc();
        }
        t1.join();
        t2.join();
        t3.join();
        t1v.join();
        t2v.join();

    }
}