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import java.lang.reflect.Array;
import jdk.test.lib.Asserts;

/**
 * @test
 * @bug 8348631
 * @summary Test folding of array guards used by intrinsics.
 * @library /test/lib
 * @run main/othervm -Xcomp -XX:-TieredCompilation
 *                   -XX:CompileCommand=compileonly,TestArrayGuardWithInterfaces::test*
 *                   TestArrayGuardWithInterfaces
 */
public class TestArrayGuardWithInterfaces {

    public static interface MyInterface { }

    public static int test1(Object obj) {
        // Should be folded, arrays can never imlement 'MyInterface'
        return Array.getLength((MyInterface)obj);
    }

    public static int test2(Object obj) {
        // Should not be folded, arrays implement 'Cloneable'
        return Array.getLength((Cloneable)obj);
    }

    public static void main(String[] args) {
        // Warmup
        Class c = MyInterface.class;
        Array.getLength(args);

        try {
            test1(null);
            throw new RuntimeException("No exception thrown");
        } catch (Exception e) {
            // Expected
        }
        Asserts.assertEQ(test2(new int[1]), 1);
    }
}