/*

 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 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

 * @summary Verifies the behaviour of Unsafe.allocateInstance

 * @library /test/lib

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main AllocateInstance

 */

import jdk.internal.misc.Unsafe;

import static jdk.test.lib.Asserts.*;

public class AllocateInstance {

    static final Unsafe UNSAFE = Unsafe.getUnsafe();

    class TestClass {

        public boolean calledConstructor = false;

        public TestClass() {

            calledConstructor = true;

        }

    }

    static void testConstructorCall() throws InstantiationException {

        // allocateInstance() should not result in a call to the constructor

        TestClass tc = (TestClass)UNSAFE.allocateInstance(TestClass.class);

        assertFalse(tc.calledConstructor);

    }

    abstract class AbstractClass {

        public AbstractClass() {}

    }

    static void testAbstractClass() {

        try {

            AbstractClass ac = (AbstractClass) UNSAFE.allocateInstance(AbstractClass.class);

            throw new AssertionError("Should throw InstantiationException for an abstract class");

        } catch (InstantiationException e) {

            // Expected

        }

    }

    interface AnInterface {}

    static void testInterface() {

        try {

            AnInterface ai = (AnInterface) UNSAFE.allocateInstance(AnInterface.class);

            throw new AssertionError("Should throw InstantiationException for an interface");

        } catch (InstantiationException e) {

            // Expected

        }

    }

    public static void main(String args[]) throws Exception {

        for (int i = 0; i < 20_000; i++) {

            testConstructorCall();

            testAbstractClass();

            testInterface();

        }

    }

}