/*

 * Copyright (c) 2018, Red Hat, Inc. 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 8215265

 * @summary C2: range check elimination may allow illegal out of bound access

 *

 * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:-UseLoopPredicate RangeCheckEliminationScaleNotOne

 *

 */

import java.util.Arrays;

public class RangeCheckEliminationScaleNotOne {

    public static void main(String[] args) {

        {

            int[] array = new int[199];

            boolean[] flags = new boolean[100];

            Arrays.fill(flags, true);

            flags[0] = false;

            flags[1] = false;

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

                test1(100, array, 0, flags);

            }

            boolean ex = false;

            try {

                test1(100, array, -5, flags);

            } catch (ArrayIndexOutOfBoundsException aie) {

                ex = true;

            }

            if (!ex) {

                throw new RuntimeException("no AIOOB exception");

            }

        }

        {

            int[] array = new int[199];

            boolean[] flags = new boolean[100];

            Arrays.fill(flags, true);

            flags[0] = false;

            flags[1] = false;

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

                test2(100, array, 198, flags);

            }

            boolean ex = false;

            try {

                test2(100, array, 203, flags);

            } catch (ArrayIndexOutOfBoundsException aie) {

                ex = true;

            }

            if (!ex) {

                throw new RuntimeException("no AIOOB exception");

            }

        }

    }

    private static int test1(int stop, int[] array, int offset, boolean[] flags) {

        if (array == null) {}

        int res = 0;

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

            if (flags[i]) {

                res += array[2 * i + offset];

            }

        }

        return res;

    }

    private static int test2(int stop, int[] array, int offset, boolean[] flags) {

        if (array == null) {}

        int res = 0;

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

            if (flags[i]) {

                res += array[-2 * i + offset];

            }

        }

        return res;

    }

}