/*

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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/**

 * @test

 * @bug 8136473

 * @summary Mismatched stores on same slice possible with Unsafe.Put*Unaligned methods

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

 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestUnsafeUnalignedMismatchedAccesses

 * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:+UnlockDiagnosticVMOptions -XX:-UseUnalignedAccesses TestUnsafeUnalignedMismatchedAccesses

 *

 */

import java.lang.reflect.*;

import jdk.internal.misc.Unsafe;

public class TestUnsafeUnalignedMismatchedAccesses {

    private static final Unsafe UNSAFE;

    static {

        try {

            Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");

            unsafeField.setAccessible(true);

            UNSAFE = (Unsafe) unsafeField.get(null);

        }

        catch (Exception e) {

            throw new AssertionError(e);

        }

    }

    static void test1(byte[] array) {

        array[0] = 0;

        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);

        array[0] = 0;

    }

    static void test2(byte[] array) {

        array[0] = 0;

        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, 0);

        array[0] = 0;

    }

    static void test3(byte[] array) {

        array[0] = 0;

        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+2, 0);

        array[0] = 0;

    }

    static void test4(byte[] array) {

        array[0] = 0;

        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+3, 0);

        array[0] = 0;

    }

    static void test5(byte[] array) {

        array[0] = 0;

        UNSAFE.putInt(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);

        array[0] = 0;

    }

    // unaligned access and non escaping allocation

    static void test6() {

        byte[] array = new byte[10];

        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);

        array[0] = 0;

    }

    // unaligned access and non escaping allocation

    static int test7() {

        byte[] array = new byte[10];

        UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);

        array[0] = 0;

        array[2] = 0;

        return array[0] + array[1] + array[2] + array[3] + array[4];

    }

    // unaligned access with vectorization

    static void test8(int[] src1, int[] src2, int[] dst) {

        for (int i = 0; i < dst.length-1; i++) {

            int res = src1[i] + src2[i];

            UNSAFE.putIntUnaligned(dst, UNSAFE.ARRAY_INT_BASE_OFFSET + i*4+1, res);

        }

    }

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

        byte[] byte_array = new byte[100];

        int[] int_array = new int[100];

        Object[] obj_array = new Object[100];

        TestUnsafeUnalignedMismatchedAccesses test = new TestUnsafeUnalignedMismatchedAccesses();

        for (int i = 0; i < 20000; i++) {

            test1(byte_array);

            test2(byte_array);

            test3(byte_array);

            test4(byte_array);

            test5(byte_array);

            test6();

            test7();

            test8(int_array, int_array, int_array);

        }

    }

}