jdk-24/test/hotspot/jtreg/runtime/Nestmates/privateConstructors/TestMethodHandles.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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8046171
 * @summary Test access to private constructors between nestmates and nest-host
 *          using different flavours of named nested types using MethodHandles
 * @run main TestMethodHandles
 */

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

public class TestMethodHandles {

  static final MethodType NOARG_T = MethodType.methodType(void.class);
  static final MethodType INNER_T = MethodType.methodType(void.class, TestMethodHandles.class);

    // All constructors are private to ensure nestmate access checks apply

    // All doConstruct methods are public so they don't involve invoke_special

    private TestMethodHandles() {}

    // The various nestmates

    // Note: No constructor on interfaces so no StaticIface variants

    static interface StaticIface {

        // Methods that will access private constructors of nestmates.
        // The arg is a dummy for overloading purposes

        default void doConstruct(TestMethodHandles o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(TestMethodHandles.class, NOARG_T);
            TestMethodHandles obj = (TestMethodHandles) mh.invoke();
            obj = (TestMethodHandles) mh.invokeExact();
        }
        default void doConstruct(TestMethodHandles outer, InnerNested o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(InnerNested.class, INNER_T);
            InnerNested obj = (InnerNested) mh.invoke(outer);
            obj = (InnerNested) mh.invokeExact(outer);
        }
        default void doConstruct(StaticNested o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(StaticNested.class, NOARG_T);
            StaticNested obj = (StaticNested) mh.invoke();
            obj = (StaticNested) mh.invokeExact();
        }
    }

    static class StaticNested {

        private StaticNested() {}

        // Methods that will access private constructors of nestmates.
        // The arg is a dummy for overloading purposes

        public void doConstruct(TestMethodHandles o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(TestMethodHandles.class, NOARG_T);
            TestMethodHandles obj = (TestMethodHandles) mh.invoke();
            obj = (TestMethodHandles) mh.invokeExact();
        }
        public  void doConstruct(TestMethodHandles outer, InnerNested o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(InnerNested.class, INNER_T);
            InnerNested obj = (InnerNested) mh.invoke(outer);
            obj = (InnerNested) mh.invokeExact(outer);
        }
        public void doConstruct(StaticNested o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(StaticNested.class, NOARG_T);
            StaticNested obj = (StaticNested) mh.invoke();
            obj = (StaticNested) mh.invokeExact();
        }
    }

    class InnerNested {

        private InnerNested() {}

        // Methods that will access private constructors of nestmates.
        // The arg is a dummy for overloading purposes

        public void doConstruct(TestMethodHandles o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(TestMethodHandles.class, NOARG_T);
            TestMethodHandles obj = (TestMethodHandles) mh.invoke();
            obj = (TestMethodHandles) mh.invokeExact();
        }
        public  void doConstruct(TestMethodHandles outer, InnerNested o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(InnerNested.class, INNER_T);
            InnerNested obj = (InnerNested) mh.invoke(outer);
            obj = (InnerNested) mh.invokeExact(outer);
        }
        public void doConstruct(StaticNested o) throws Throwable {
            MethodHandle mh =
              lookup().findConstructor(StaticNested.class, NOARG_T);
            StaticNested obj = (StaticNested) mh.invoke();
            obj = (StaticNested) mh.invokeExact();
        }
    }

    public static void main(String[] args) throws Throwable {
        // These initial constructions test nest-host access
        MethodHandle mh =
          lookup().findConstructor(TestMethodHandles.class, NOARG_T);
        TestMethodHandles o = (TestMethodHandles) mh.invoke();
        o = (TestMethodHandles) mh.invokeExact();

        mh = lookup().findConstructor(StaticNested.class, NOARG_T);
        StaticNested s = (StaticNested) mh.invoke();
        s = (StaticNested) mh.invokeExact();

        mh = lookup().findConstructor(InnerNested.class, INNER_T);
        InnerNested i = (InnerNested) mh.invoke(o);
        i = (InnerNested) mh.invokeExact(o);

        StaticIface intf = new StaticIface() {};

        s.doConstruct(o);
        s.doConstruct(o, i);
        s.doConstruct(s);

        i.doConstruct(o);
        i.doConstruct(o, i);
        i.doConstruct(s);

        intf.doConstruct(o);
        intf.doConstruct(o, i);
        intf.doConstruct(s);
    }
}