| /* |
| * 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 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; |
| } |
| |
| |
| } |
| } |
| |