1 /*
   2  * Copyright (c) 2013, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.io.BufferedReader;
  25 import java.io.InputStreamReader;
  26 import java.lang.Class;
  27 import java.lang.String;
  28 import java.lang.System;
  29 import java.lang.management.ManagementFactory;
  30 import java.lang.management.RuntimeMXBean;
  31 import java.util.ArrayList;
  32 import java.util.List;
  33 import java.util.concurrent.CyclicBarrier;
  34 import java.util.regex.Matcher;
  35 import java.util.regex.Pattern;
  36 import java.lang.reflect.Field;
  37 import java.lang.reflect.Modifier;
  38 import sun.misc.Unsafe;
  39 import jdk.internal.vm.annotation.Contended;
  40 
  41 /*
  42  * @test
  43  * @bug     8015272
  44  * @summary \@Contended within the same group to use the same oop map
  45  *
  46  * @modules java.base/jdk.internal.vm.annotation
  47  * @run main/othervm -XX:-RestrictContended -XX:ContendedPaddingWidth=128 -Xmx128m OopMapsSameGroup
  48  */
  49 public class OopMapsSameGroup {
  50 
  51     public static final int COUNT = 10000;
  52 
  53     public static void main(String[] args) throws Exception {
  54         Object o01 = new Object();
  55         Object o02 = new Object();
  56         Object o03 = new Object();
  57         Object o04 = new Object();
  58 
  59         R[] rs = new R[COUNT];
  60 
  61         for (int i = 0; i < COUNT; i++) {
  62            R r = new R();
  63            r.o01 = o01;
  64            r.o02 = o02;
  65            r.o03 = o03;
  66            r.o04 = o04;
  67            rs[i] = r;
  68         }
  69 
  70         System.gc();
  71 
  72         for (int i = 0; i < COUNT; i++) {
  73            R r = rs[i];
  74            if (r.o01 != o01) throw new Error("Test Error: o01");
  75            if (r.o02 != o02) throw new Error("Test Error: o02");
  76            if (r.o03 != o03) throw new Error("Test Error: o03");
  77            if (r.o04 != o04) throw new Error("Test Error: o04");
  78         }
  79     }
  80 
  81     public static class R {
  82         @Contended("group1")
  83         Object o01;
  84 
  85         @Contended("group1")
  86         Object o02;
  87 
  88         @Contended("group2")
  89         Object o03;
  90 
  91         @Contended("group2")
  92         Object o04;
  93     }
  94 
  95 }
  96