1 /* 2 * Copyright (c) 2015, 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 * 32 * @run main/bootclasspath -Xcomp -XX:CompileOnly=::testCompile 33 * java.lang.invoke.TestStableMemoryBarrier 34 * 35 * @author hui.shi@linaro.org 36 */ 37 package java.lang.invoke; 38 39 import jdk.internal.vm.annotation.Stable; 40 41 import java.lang.reflect.InvocationTargetException; 42 43 public class TestStableMemoryBarrier { 44 45 public static void main(String[] args) throws Exception { 46 run(NotDominate.class); 47 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 55 static class NotDominate{ 56 public @Stable int v; 57 public static int[] array = new int[100]; 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 public static void test() throws Exception { 70 for (int i = 0; i < 1000000; i++) 71 testCompile(i); 72 } 73 } 74 75 public static void run(Class<?> test) { 76 Throwable ex = null; 77 System.out.print(test.getName()+": "); 78 try { 79 test.getMethod("test").invoke(null); 80 } catch (InvocationTargetException e) { 81 ex = e.getCause(); 82 } catch (Throwable e) { 83 ex = e; 84 } finally { 85 if (ex == null) { 86 System.out.println("PASSED"); 87 } else { 88 System.out.println("FAILED"); 89 ex.printStackTrace(System.out); 90 } 91 } 92 } 93 }