jdk-24/hotspot/test/runtime/jni/PrivateInterfaceMethods/PrivateInterfaceMethods.java

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/* @test
 * @bug 8081800
 * @summary Add JNI invocation tests for private interface methods
 * @run main/native PrivateInterfaceMethods
 */

public class PrivateInterfaceMethods {

    static {
        System.loadLibrary("PrivateInterfaceMethods");
    }

    static native int callIntVoid(Object target, String definingClassName, String methodName, boolean virtual);

    static interface A {
        static final int AmResult = 1;
        private int m() { return AmResult; }
    }

    static interface B extends A {
        // No m() here
    }

    static interface C extends B {
        static final int CmResult = 2;
        private int m() { return CmResult; }  // unrelated to A.m
    }

    public static class Impl implements C {
        static final int ImplmResult = 3;
        private int m() { return ImplmResult; } // unrelated to A.m or C.m
    }

    // We found that itable/vtable construction was affected by whether or not the
    // implementation class declared a method with the same signature as the
    // private interface method, so we test both variants.

    public static class Impl2 implements C {
    }

    public static void main(String[] args) {
        Impl impl = new Impl();

        // Note: JNI doesn't enforce access control so we can make
        //       private calls not possible in Java code.
        //       Also it doesn't check that the receiver is a type that
        //       defines the method!

        // test: ((A)impl).m() - should succeed
        test(impl, A.class.getName(), "m", A.AmResult, true, null);
        test(impl, A.class.getName(), "m", A.AmResult, false, null);

        // test: ((B)impl).m() - should fail: NoSuchMethodError
        test(impl, B.class.getName(), "m", -1, true, NoSuchMethodError.class);
        test(impl, B.class.getName(), "m", -1, false, NoSuchMethodError.class);

        // test: ((C)impl).m() - should succeed
        test(impl, C.class.getName(), "m", C.CmResult, true, null);
        test(impl, C.class.getName(), "m", C.CmResult, false, null);

        // test: impl.m() - should succeed
        test(impl, Impl.class.getName(), "m", Impl.ImplmResult, true, null);
        test(impl, Impl.class.getName(), "m", Impl.ImplmResult, false, null);

        // ---

        Impl2 impl2 = new Impl2();

        // test: ((A)impl2).m() - should succeed
        test(impl2, A.class.getName(), "m", A.AmResult, true, null);
        test(impl2, A.class.getName(), "m", A.AmResult, false, null);

        // test: ((B)impl2).m() - should fail: NoSuchMethodError
        test(impl2, B.class.getName(), "m", -1, true, NoSuchMethodError.class);
        test(impl2, B.class.getName(), "m", -1, false, NoSuchMethodError.class);

        // test: ((C)impl2).m() - should succeed
        test(impl2, C.class.getName(), "m", C.CmResult, true, null);
        test(impl2, C.class.getName(), "m", C.CmResult, false, null);

        // test: impl2.m() - should fail: NoSuchMethodError
        test(impl2, Impl2.class.getName(), "m", -1, true, NoSuchMethodError.class);
        test(impl2, Impl2.class.getName(), "m", -1, false, NoSuchMethodError.class);
    }

    static void test(Object target, String definingClass, String method,
                     int expected, boolean virtual, Class<?> expectedException) {

        String desc = (virtual ? "Virtual" : "Nonvirtual") + " Invocation of " +
                       definingClass + "." + method + " on instance of class " +
                       target.getClass().getName();
        try {
            int res = callIntVoid(target, definingClass, method, virtual);
            if (expectedException != null)
                throw new Error(desc + " succeeded - but expected exception " + expectedException.getSimpleName());
            if (res != expected)
                throw new Error(desc + " got wrong result: " + res + " instead of " + expected);
            System.out.println(desc + " - passed");
        }
        catch (Throwable t) {
           if (t.getClass() != expectedException)
               throw new Error(desc + " failed", t);
           else
              System.out.println(desc + " threw " + expectedException.getSimpleName() + " as expected");
        }
    }
}