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 * @library /testlibrary /test/lib 31 * @modules java.base/jdk.internal.misc 32 * @modules java.base/jdk.internal.vm.annotation 33 * 34 * @run main/bootclasspath/othervm -Xcomp -XX:CompileOnly=::testCompile 35 * compiler.stable.TestStableMemoryBarrier 36 * 37 * @author hui.shi@linaro.org 38 */ 39 40 package compiler.stable; 41 42 import jdk.internal.vm.annotation.Stable; 43 44 public class TestStableMemoryBarrier { 45 public static void main(String[] args) throws Exception { 46 for (int i = 0; i < 1000000; i++) { 47 NotDominate.testCompile(i); 48 } 49 } 50 /* ==================================================== 51 * Stable field initialized in method, but its allocation 52 * doesn't dominate MemBar Release at the end of method. 53 */ 54 private static class NotDominate { 55 public @Stable int v; 56 public static int[] array = new int[100]; 57 58 public static NotDominate testCompile(int n) { 59 if ((n % 2) == 0) return null; 60 // add a loop here, trigger PhaseIdealLoop::verify_dominance 61 for (int i = 0; i < 100; i++) { 62 array[i] = n; 63 } 64 NotDominate nm = new NotDominate(); 65 nm.v = n; 66 return nm; 67 } 68 69 70 } 71 } 72