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import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.reflect.InvocationTargetException;
import java.util.stream.Stream;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;

import static org.junit.jupiter.api.Assertions.*;

/*
 * @test
 * @bug 8164714
 * @summary Null check for immediate enclosing instance for VM/reflective
 *          invocation of inner classes
 *
 * @clean *
 * @compile OuterThisNullChecks.java
 * @run junit OuterThisNullChecks
 *
 * @clean *
 * @compile --release 17 -XDnullCheckOuterThis=true OuterThisNullChecks.java
 * @run junit OuterThisNullChecks
 */
class OuterThisNullChecks {
    static Stream<Class<?>> testClasses() {
        return Stream.of(NoOuterThis.class, OuterThisField.class);
    }

    @MethodSource("testClasses")
    @ParameterizedTest
    void testNoOuter(Class<?> clz) {
        var ite = assertThrows(InvocationTargetException.class, () -> clz.getDeclaredConstructor(OuterThisNullChecks.class).newInstance((Object) null));
        assertInstanceOf(NullPointerException.class, ite.getCause());

        MethodHandle mh = assertDoesNotThrow(() -> MethodHandles.lookup().findConstructor(clz, MethodType.methodType(void.class, OuterThisNullChecks.class)))
                .asType(MethodType.methodType(Object.class, Object.class));
        assertThrows(NullPointerException.class, () -> {
            Object stub = mh.invokeExact((Object) null);
        });
    }

    class NoOuterThis {}
    class OuterThisField {
        @Override
        public String toString() {
            return "outer this = " + OuterThisNullChecks.this;
        }
    }
}