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 * particular file as subject to the "Classpath" exception as provided

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 * 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

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 * accompanied this code).

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/*

 * @test TestStableMemoryBarrier

 * @bug 8139758

 * @summary tests memory barrier correctly inserted for stable fields

 * @modules java.base/jdk.internal.vm.annotation

 *

 * @run main/bootclasspath/othervm -Xcomp -XX:CompileOnly=::testCompile

 *                                 compiler.stable.TestStableMemoryBarrier

 *

 * @author hui.shi@linaro.org

 */

package compiler.stable;

import jdk.internal.vm.annotation.Stable;

public class TestStableMemoryBarrier {

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

        for (int i = 0; i < 1000000; i++) {

            NotDominate.testCompile(i);

        }

    }

    /* ====================================================

     * Stable field initialized in method, but its allocation

     * doesn't dominate MemBar Release at the end of method.

     */

    private static class NotDominate {

        public @Stable int v;

        public static int[] array = new int[100];

        public static NotDominate testCompile(int n) {

            if ((n % 2) == 0) return null;

            // add a loop here, trigger PhaseIdealLoop::verify_dominance

            for (int i = 0; i < 100; i++) {

                array[i] = n;

            }

            NotDominate nm = new NotDominate();

            nm.v = n;

            return nm;

        }

    }

}