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 * @run main ClassFileInstaller 32 * java/lang/invoke/TestStableMemoryBarrier 33 * java/lang/invoke/TestStableMemoryBarrier$NotDominate 34 * 35 * @run main/othervm/bootclasspath -Xcomp -XX:CompileOnly=::testCompile 36 * java.lang.invoke.TestStableMemoryBarrier 37 * 38 * @author hui.shi@linaro.org 39 */ 40 package java.lang.invoke; 41 42 import java.lang.reflect.InvocationTargetException; 43 44 public class TestStableMemoryBarrier { 45 46 public static void main(String[] args) throws Exception { 47 run(NotDominate.class); 48 49 } 50 51 /* ==================================================== 52 * Stable field initialized in method, but its allocation 53 * doesn't dominate MemBar Release at the end of method. 54 */ 55 56 static class NotDominate{ 57 public @Stable int v; 58 public static int[] array = new int[100]; 59 public static NotDominate testCompile(int n) { 60 if ((n % 2) == 0) return null; 61 // add a loop here, trigger PhaseIdealLoop::verify_dominance 62 for (int i = 0; i < 100; i++) { 63 array[i] = n; 64 } 65 NotDominate nm = new NotDominate(); 66 nm.v = n; 67 return nm; 68 } 69 70 public static void test() throws Exception { 71 for (int i = 0; i < 1000000; i++) 72 testCompile(i); 73 } 74 } 75 76 public static void run(Class<?> test) { 77 Throwable ex = null; 78 System.out.print(test.getName()+": "); 79 try { 80 test.getMethod("test").invoke(null); 81 } catch (InvocationTargetException e) { 82 ex = e.getCause(); 83 } catch (Throwable e) { 84 ex = e; 85 } finally { 86 if (ex == null) { 87 System.out.println("PASSED"); 88 } else { 89 System.out.println("FAILED"); 90 ex.printStackTrace(System.out); 91 } 92 } 93 } 94 }