1 /* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * @test TestStableMemoryBarrier 28 * @bug 8139758 29 * @summary tests memory barrier correctly inserted for stable fields 30 * @modules java.base/jdk.internal.vm.annotation 31 * 32 * @run main/bootclasspath/othervm -Xcomp -XX:CompileOnly=::testCompile 33 * compiler.stable.TestStableMemoryBarrier 34 * 35 * @author hui.shi@linaro.org 36 */ 37 38 package compiler.stable; 39 40 import jdk.internal.vm.annotation.Stable; 41 42 public class TestStableMemoryBarrier { 43 public static void main(String[] args) throws Exception { 44 for (int i = 0; i < 1000000; i++) { 45 NotDominate.testCompile(i); 46 } 47 } 48 /* ==================================================== 49 * Stable field initialized in method, but its allocation 50 * doesn't dominate MemBar Release at the end of method. 51 */ 52 private static class NotDominate { 53 public @Stable int v; 54 public static int[] array = new int[100]; 55 56 public static NotDominate testCompile(int n) { 57 if ((n % 2) == 0) return null; 58 // add a loop here, trigger PhaseIdealLoop::verify_dominance 59 for (int i = 0; i < 100; i++) { 60 array[i] = n; 61 } 62 NotDominate nm = new NotDominate(); 63 nm.v = n; 64 return nm; 65 } 66 67 68 } 69 } 70