1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. 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 /**
  25  * @test TestRefArrays
  26  * @key gc
  27  * @requires vm.gc.Epsilon
  28  * @summary Epsilon is able to allocate arrays, and does not corrupt their state
  29  * @library /test/lib
  30  *
  31  * @run main/othervm -Xmx1g                                        -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  32  * @run main/othervm -Xmx1g -Xint                                  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  33  * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  34  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  35  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  36  *
  37  * @run main/othervm -Xmx1g                                        -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  38  * @run main/othervm -Xmx1g -Xint                                  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  39  * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  40  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  41  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestRefArrays
  42  */
  43 
  44 import java.util.Random;
  45 
  46 public class TestRefArrays {
  47 
  48   static long SEED = Long.getLong("seed", System.nanoTime());
  49   static int COUNT = Integer.getInteger("count", 1000); // ~500 MB allocation
  50 
  51   static MyObject[][] arr;
  52 
  53   public static void main(String[] args) throws Exception {
  54     Random r = new Random(SEED);
  55 
  56     arr = new MyObject[COUNT * 100][];
  57     for (int c = 0; c < COUNT; c++) {
  58       arr[c] = new MyObject[c * 100];
  59       for (int v = 0; v < c; v++) {
  60         arr[c][v] = new MyObject(r.nextInt());
  61       }
  62     }
  63 
  64     r = new Random(SEED);
  65     for (int c = 0; c < COUNT; c++) {
  66       MyObject[] b = arr[c];
  67       if (b.length != (c * 100)) {
  68         throw new IllegalStateException("Failure: length = " + b.length + ", need = " + (c*100));
  69       }
  70       for (int v = 0; v < c; v++) {
  71         int actual = b[v].id();
  72         int expected = r.nextInt();
  73         if (actual != expected) {
  74           throw new IllegalStateException("Failure: expected = " + expected + ", actual = " + actual);
  75         }
  76       }
  77     }
  78   }
  79 
  80   public static class MyObject {
  81     int id;
  82     public MyObject(int id) {
  83       this.id = id;
  84     }
  85     public int id() {
  86       return id;
  87     }
  88   }
  89 }