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/*
 * @test
 * @summary AOT training run should fail if critical classes have been redefined by JVMTI
 * @bug 8380409
 * @requires vm.cds.supports.aot.class.linking
 * @library /test/lib
 * @run driver RedefineClassHelper
 * @build RedefineCriticalClasses
 * @run driver jdk.test.lib.helpers.ClassFileInstaller -jar app.jar RedefineCriticalClassesApp
 * @run driver RedefineCriticalClasses
 */

import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import jdk.test.lib.cds.CDSTestUtils;
import jdk.test.lib.helpers.ClassFileInstaller;
import jdk.test.lib.process.ProcessTools;

public class RedefineCriticalClasses {
    public static void main(String... args) throws Exception {
        ArrayList<String> processArgs = new ArrayList<>();

        // redefineagent.jar is created by "@run driver RedefineClassHelper"
        processArgs.add("-javaagent:redefineagent.jar");

        processArgs.add("-XX:AOTMode=record");
        processArgs.add("-XX:AOTConfiguration=app.aotconfig");
        processArgs.add("-Xlog:aot,cds");
        processArgs.add("-cp");
        processArgs.add("app.jar");
        processArgs.add("RedefineCriticalClassesApp");

        ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder(processArgs);
        CDSTestUtils.executeAndLog(pb, "train")
            .shouldContain("Redefined: class java.lang.Class")
            .shouldContain("Skipping java/lang/Class: Has been redefined")
            .shouldContain("Critical class java.lang.Class has been excluded. AOT configuration file cannot be written")
            .shouldHaveExitValue(1);
    }
}

class RedefineCriticalClassesApp {
    public static void main(String[] args) throws Exception {
        // Use RedefineClassHelper (loaded from redefineagent.jar into the boot class loader)
        // to redefine java/lang/Class, using the exact same bytecodes as from the JDK.
        // The JVM will mark it as having been redefined by JVMTI and will exclude it from the
        // AOT configuration file.

        URL url = new URL("jrt:/java.base/java/lang/Class.class");
        try (InputStream in = url.openConnection().getInputStream()) {
            byte[] b = in.readAllBytes();
            System.out.println("Length = " + b.length);
            RedefineClassHelper.redefineClass(Class.class, b);
            System.out.println("Redefined: " + Class.class);
        }
    }
}