1 /* 2 * Copyright (c) 2014, 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 * @summary tests memory barrier correctly inserted for stable fields 29 * @library /testlibrary /../../test/lib 30 * @build TestStableMemoryBarrier 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 java.lang.reflect.InvocationTargetException; 40 41 public class TestStableMemoryBarrier { 42 43 public static void main(String[] args) throws Exception { 44 run(NotDominate.class); 45 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 53 static class NotDominate{ 54 public @Stable int v; 55 public static int[] array = new int[100]; 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 public static void test() throws Exception { 68 for (int i = 0; i < 1000000; i++) 69 testCompile(i); 70 } 71 } 72 73 public static void run(Class<?> test) { 74 Throwable ex = null; 75 System.out.print(test.getName()+": "); 76 try { 77 test.getMethod("test").invoke(null); 78 } catch (InvocationTargetException e) { 79 ex = e.getCause(); 80 } catch (Throwable e) { 81 ex = e; 82 } finally { 83 if (ex == null) { 84 System.out.println("PASSED"); 85 } else { 86 System.out.println("FAILED"); 87 ex.printStackTrace(System.out); 88 } 89 } 90 } 91 }