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

 *

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 * 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).

 *

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 * 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

 * @bug 8229016 8231055

 * @summary Test correct elimination of array allocation with arraycopy to itself.

 * @library /test/lib

 * @run main/othervm -Xbatch -XX:CompileCommand=compileonly,compiler.escapeAnalysis.TestSelfArrayCopy::test*

 *                   compiler.escapeAnalysis.TestSelfArrayCopy

 */

package compiler.escapeAnalysis;

import jdk.test.lib.Utils;

public class TestSelfArrayCopy {

    private static boolean b = false;

    private static final int rI1 = Utils.getRandomInstance().nextInt();

    private static final int rI2 = Utils.getRandomInstance().nextInt();

    private static int test1() {

        // Non-escaping allocation

        Integer[] array = {rI1, rI2};

        // Arraycopy with src == dst

        System.arraycopy(array, 0, array, 0, array.length - 1);

        if (b) {

            // Uncommon trap

            System.out.println(array[0]);

        }

        return array[0] + array[1];

    }

    private static int test2() {

        // Non-escaping allocation

        Integer[] array = {rI1, rI2};

        // Arraycopy with src == dst

        System.arraycopy(array, 0, array, 1, 1);

        if (b) {

            // Uncommon trap

            System.out.println(array[0]);

        }

        return array[0] + array[1];

    }

    public static void main(String[] args) {

        int expected1 = rI1 + rI2;

        int expected2 = rI1 + rI1;

        // Trigger compilation

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

            int result = test1();

            if (result != expected1) {

                throw new RuntimeException("Incorrect result: " + result + " != " + expected1);

            }

            result = test2();

            if (result != expected2) {

                throw new RuntimeException("Incorrect result: " + result + " != " + expected2);

            }

        }

        b = true;

        int result = test1();

        if (result != expected1) {

            throw new RuntimeException("Incorrect result: " + result + " != " + expected1);

        }

        result = test2();

        if (result != expected2) {

            throw new RuntimeException("Incorrect result: " + result + " != " + expected2);

        }

    }

}