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 }