/*

 * 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.fieldOffset

 * @library /test/lib

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

 *          java.management

 * @run main FieldOffset

 */

import java.lang.reflect.Field;

import jdk.internal.misc.Unsafe;

import java.lang.reflect.*;

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

public class FieldOffset {

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

        Field[] fields = Test.class.getDeclaredFields();

        for (int i = 0; i < fields.length; i++) {

            long offset = unsafe.objectFieldOffset(fields[i]);

            // Ensure we got a valid offset value back

            assertNotEquals(offset, unsafe.INVALID_FIELD_OFFSET);

            // Make sure the field offset is unique

            for (int j = 0; j < i; j++) {

                assertNotEquals(offset, unsafe.objectFieldOffset(fields[j]));

            }

        }

        fields = StaticTest.class.getDeclaredFields();

        for (int i = 0; i < fields.length; i++) {

            long offset = unsafe.staticFieldOffset(fields[i]);

            // Ensure we got a valid offset value back

            assertNotEquals(offset, unsafe.INVALID_FIELD_OFFSET);

            // Make sure the field offset is unique

            for (int j = 0; j < i; j++) {

                assertNotEquals(offset, unsafe.staticFieldOffset(fields[j]));

            }

        }

    }

    class Test {

        boolean booleanField;

        byte byteField;

        char charField;

        double doubleField;

        float floatField;

        int intField;

        long longField;

        Object objectField;

        short shortField;

    }

    static class StaticTest {

        static boolean booleanField;

        static byte byteField;

        static char charField;

        static double doubleField;

        static float floatField;

        static int intField;

        static long longField;

        static Object objectField;

        static short shortField;

    }

}