test/hotspot/jtreg/runtime/Nestmates/privateConstructors/TestReflection.java

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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 core reflection
 * @run main TestReflection
 * @run main/othervm -Dsun.reflect.noInflation=true TestReflection
 */

// The first run will use NativeConstructorAccessor and due to the limited
// number of calls we will not reach the inflation threshold.
// The second run disables inflation so we will use the
// GeneratedConstructorAccessor instead.
// In this way both sets of Reflection classes are tested.

public class TestReflection {

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

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

    private TestReflection() {}

    // The various nestmates

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

    static interface StaticIface {

        // Methods that will access private constructors of nestmates.

        default void doConstruct(TestReflection o) throws Throwable {
          Object obj = o.getClass().getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        }
        default void doConstruct(TestReflection tr, InnerNested o) throws Throwable {
          Object obj = InnerNested.class.getDeclaredConstructor(new Class<?>[] {TestReflection.class}).newInstance(new Object[] { tr });
        }
        default void doConstruct(StaticNested o) throws Throwable {
          Object obj = o.getClass().getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        }
    }

    static class StaticNested {

        private StaticNested() {}

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

        public void doConstruct(TestReflection o) throws Throwable {
          Object obj = o.getClass().getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        }
        public  void doConstruct(TestReflection tr, InnerNested o) throws Throwable {
          Object obj = InnerNested.class.getDeclaredConstructor(new Class<?>[] {TestReflection.class}).newInstance(new Object[] { tr });
        }
        public void doConstruct(StaticNested o) throws Throwable {
          Object obj = o.getClass().getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        }
    }

    class InnerNested {

        private InnerNested() {}

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

        public void doConstruct(TestReflection o) throws Throwable {
          Object obj = o.getClass().getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        }
        public  void doConstruct(TestReflection tr, InnerNested o) throws Throwable {
          Object obj = InnerNested.class.getDeclaredConstructor(new Class<?>[] {TestReflection.class}).newInstance(new Object[] { tr });
        }
        public void doConstruct(StaticNested o) throws Throwable {
          Object obj = o.getClass().getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        }
    }

    public static void main(String[] args) throws Throwable {
        // These initial constructions test nest-host access
        TestReflection o = TestReflection.class.getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        StaticNested s = StaticNested.class.getDeclaredConstructor(new Class<?>[0]).newInstance(new Object[0]);
        InnerNested i = InnerNested.class.getDeclaredConstructor(new Class<?>[] {TestReflection.class}).newInstance(new Object[] { 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);
    }
}