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 }