jdk-24/test/hotspot/jtreg/runtime/Nestmates/privateMethods/TestMethodHandlesHierarchy.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8046171
 * @summary Test access to private methods between nestmates where there
 *          is an inheritance hierarchy and we invoke private methods that
 *          exist in specific classes in the hierarchy.
 * @run main TestMethodHandlesHierarchy
 */

import java.lang.invoke.*;
import static java.lang.invoke.MethodHandles.*;
import static java.lang.invoke.MethodType.*;

public class TestMethodHandlesHierarchy {

   static final MethodType M_T = MethodType.methodType(String.class);

    static class NestedA extends ExternalSuper {
        static final String ID =  "NestedA::priv_invoke";
        private String priv_invoke() {
            return ID;
        }
        static void checkA(NestedA a) throws Throwable {
            MethodHandle mh =
                lookup().findSpecial(NestedA.class, "priv_invoke",
                                     M_T,  NestedA.class);
            verifyEquals((String)mh.invoke(a), NestedA.ID);
            verifyEquals((String)mh.invokeExact(a), NestedA.ID);

            mh = lookup().findVirtual(NestedA.class, "priv_invoke", M_T);
            verifyEquals((String)mh.invoke(a), NestedA.ID);
            verifyEquals((String)mh.invokeExact(a), NestedA.ID);
        }
    }

    static class NestedB extends NestedA {
        static final String ID =  "NestedB::priv_invoke";
        private String priv_invoke() {
            return ID;
        }
        static void checkA(NestedA a) throws Throwable {
            MethodHandle mh =
                lookup().findVirtual(NestedA.class, "priv_invoke", M_T);
            verifyEquals((String)mh.invoke(a), NestedA.ID);
            verifyEquals((String)mh.invokeExact(a), NestedA.ID);
        }
    }

    static class NestedC extends NestedB {
        static final String ID =  "NestedC::priv_invoke";
        private String priv_invoke() {
            return ID;
        }
        static void checkA(NestedA a) throws Throwable {
            MethodHandle mh =
                lookup().findVirtual(NestedA.class, "priv_invoke", M_T);
            verifyEquals((String)mh.invoke(a), NestedA.ID);
            verifyEquals((String)mh.invokeExact(a), NestedA.ID);
        }
    }

    static void checkA(NestedA a) throws Throwable {
            MethodHandle mh =
                lookup().findVirtual(NestedA.class, "priv_invoke", M_T);
            verifyEquals((String)mh.invoke(a), NestedA.ID);
            verifyEquals((String)mh.invokeExact(a), NestedA.ID);
    }

    static void checkB(NestedB b) throws Throwable {
            MethodHandle mh =
                lookup().findVirtual(NestedB.class, "priv_invoke", M_T);
            verifyEquals((String)mh.invoke(b), NestedB.ID);
            verifyEquals((String)mh.invokeExact(b), NestedB.ID);
    }

    static void checkC(NestedC c) throws Throwable {
            MethodHandle mh =
                lookup().findVirtual(NestedC.class, "priv_invoke", M_T);
            verifyEquals((String)mh.invoke(c), NestedC.ID);
            verifyEquals((String)mh.invokeExact(c), NestedC.ID);
    }


    // Access to private members of classes outside the nest is
    // not permitted. These tests should throw IllegalAccessException
    // at runtime.

    static void checkExternalSuper(ExternalSuper s) throws Throwable {
        try {
            lookup().findVirtual(ExternalSuper.class, "priv_invoke", M_T);
            throw new Error("Unexpected access to ExternalSuper.priv_invoke");
        }
        catch (IllegalAccessException iae) {
            System.out.println("Got expected exception accessing ExternalSuper.priv_invoke:" + iae);
        }
    }

    static void checkExternalSub(ExternalSub s) throws Throwable {
        try {
            lookup().findVirtual(ExternalSub.class, "priv_invoke", M_T);
            throw new Error("Unexpected access to ExternalSub.priv_invoke");
        }
        catch (IllegalAccessException iae) {
            System.out.println("Got expected exception accessing ExternalSub.priv_invoke:" + iae);
        }
    }

    static void verifyEquals(String actual, String expected) {
        if (!actual.equals(expected)) {
            throw new Error("Expected " + expected + " but got " + actual);
        }
        System.out.println("Check passed for " + expected);
    }

    public static void main(String[] args) throws Throwable {
        NestedA a = new NestedA();
        NestedB b = new NestedB();
        NestedC c = new NestedC();
        ExternalSub sub = new ExternalSub();
        ExternalSuper sup = new ExternalSuper();

        checkExternalSuper(sup);
        checkExternalSuper(a);
        checkExternalSuper(b);
        checkExternalSuper(c);
        checkExternalSuper(sub);

        checkA(a);
        checkA(b);
        checkA(c);
        checkA(sub);

        NestedA.checkA(a);
        NestedA.checkA(b);
        NestedA.checkA(c);
        NestedA.checkA(sub);

        NestedB.checkA(a);
        NestedB.checkA(b);
        NestedB.checkA(c);
        NestedB.checkA(sub);

        NestedC.checkA(a);
        NestedC.checkA(b);
        NestedC.checkA(c);
        NestedC.checkA(sub);

        checkB(b);
        checkB(c);
        checkB(sub);

        checkC(c);
        checkC(sub);

        checkExternalSub(sub);
    }
}

// Classes that are not part of the nest.
// Being non-public allows us to declare them in this file.

class ExternalSuper {
    static final String ID =  "ExternalSuper::priv_invoke";
    private String priv_invoke() {
        return ID;
    }
}


class ExternalSub extends TestMethodHandlesHierarchy.NestedC {
    static final String ID =  "ExternalSub::priv_invoke";
    private String priv_invoke() {
        return ID;
    }
}