test/hotspot/jtreg/vmTestbase/vm/mlvm/indy/func/jvmti/redefineClassInTarget/newclass/INDIFY_Dummy0.java

/*
 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * 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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package vm.mlvm.indy.func.jvmti.redefineClassInTarget;

import java.lang.invoke.CallSite;
import java.lang.invoke.ConstantCallSite;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;

import vm.mlvm.share.MlvmTest;

public class INDIFY_Dummy0 {

    private static MethodType MT_bootstrap() {
        return MethodType.methodType(CallSite.class, MethodHandles.Lookup.class, String.class, MethodType.class);
    }

    private static MethodHandle MH_bootstrap() throws Throwable {
        return MethodHandles.lookup().findStatic(
                INDIFY_Dummy0.class,
                "bootstrap",
                MT_bootstrap());
    }

    public static CallSite bootstrap(MethodHandles.Lookup l, String name, MethodType mt) throws Throwable {
        MlvmTest.getLog().display("Redefined bootstrap(): Lookup " + l + "; method name = " + name + "; method type = " + mt);
        CallSite cs = new ConstantCallSite(l.findStatic(INDIFY_Dummy0.class, "target", mt));
        return cs;
    }

    public static Boolean target(Object o, String s, int i) {
        MlvmTest.getLog().display("Redefined target called! Object = " + o + "; string = " + s + "; int = " + i);
        MlvmTest.getLog().display("The rest of methods are from " + (isRedefinedClass() ? "redefined" : "original") + " class");
        return true;
    }

    public static void redefineNow() {}

    private static MethodHandle INDY_call;
    private static MethodHandle INDY_call() throws Throwable {
        if (INDY_call != null)
            return INDY_call;

        CallSite cs = (CallSite) MH_bootstrap().invokeWithArguments(
                MethodHandles.lookup(),
                "greet",
                MethodType.methodType(Boolean.class, Object.class, String.class, int.class));

        return cs.dynamicInvoker();
    }

    public static boolean invokeTarget() throws Throwable {
        return invokeTarget0();
    }

    private static boolean invokeTarget0() throws Throwable {
        //return (boolean) InvokeDynamic.greet(new Object(), "Redefined", 456);
        Object o = new Object();
        String s = "Redefined";
        int i = 456;
        return (Boolean) INDY_call().invokeExact(o, s, i);
    }

    public static boolean isRedefinedClass() {
        return true;
    }
}