test/hotspot/jtreg/runtime/RedefineTests/RedefineLeak.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
 * @library /test/lib
 * @summary Test that redefinition reuses metaspace blocks that are freed
 * @modules java.base/jdk.internal.misc
 * @modules java.instrument
 *          jdk.jartool/sun.tools.jar
 * @run main RedefineLeak buildagent
 * @run main/othervm/timeout=6000  RedefineLeak runtest
 */

import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.lang.RuntimeException;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.Instrumentation;
import java.security.ProtectionDomain;
import java.lang.instrument.IllegalClassFormatException;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;

public class RedefineLeak {
    static class Tester {}

    static class LoggingTransformer implements ClassFileTransformer {
        static int transformCount = 0;

        public LoggingTransformer() {}

        public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined,
            ProtectionDomain protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException {

            transformCount++;
            if (transformCount % 1000 == 0) System.out.println("transformCount:" + transformCount);
            return null;
        }
    }

    public static void premain(String agentArgs, Instrumentation inst) throws Exception {
        LoggingTransformer t = new LoggingTransformer();
        inst.addTransformer(t, true);
        {
            Class demoClass = Class.forName("RedefineLeak$Tester");

            for (int i = 0; i < 10000; i++) {
               inst.retransformClasses(demoClass);
            }
        }
        System.gc();
    }
    private static void buildAgent() {
        try {
            ClassFileInstaller.main("RedefineLeak");
        } catch (Exception e) {
            throw new RuntimeException("Could not write agent classfile", e);
        }

        try {
            PrintWriter pw = new PrintWriter("MANIFEST.MF");
            pw.println("Premain-Class: RedefineLeak");
            pw.println("Agent-Class: RedefineLeak");
            pw.println("Can-Redefine-Classes: true");
            pw.println("Can-Retransform-Classes: true");
            pw.close();
        } catch (FileNotFoundException e) {
            throw new RuntimeException("Could not write manifest file for the agent", e);
        }

        sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
        if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineLeak.class" })) {
            throw new RuntimeException("Could not write the agent jar file");
        }
    }
    public static void main(String argv[]) throws Exception {
        if (argv.length == 1 && argv[0].equals("buildagent")) {
            buildAgent();
            return;
        }
        if (argv.length == 1 && argv[0].equals("runtest")) {
            // run outside of jtreg to not OOM on jtreg classes that are loaded after metaspace is full
            String[] javaArgs1 = { "-XX:MetaspaceSize=12m", "-XX:MaxMetaspaceSize=12m",
                                   "-javaagent:redefineagent.jar", "RedefineLeak"};
            ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(javaArgs1);

            OutputAnalyzer output = new OutputAnalyzer(pb.start());
            output.shouldContain("transformCount:10000");
        }
    }
}