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 package gc.epsilon;
  25 
  26 /**
  27  * @test TestByteArrays
  28  * @key randomness
  29  * @requires vm.gc.Epsilon
  30  * @summary Epsilon is able to allocate arrays, and does not corrupt their state
  31  * @library /test/lib
  32  *
  33  * @run main/othervm -Xmx1g                                        -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  34  * @run main/othervm -Xmx1g -Xint                                  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  35  * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  36  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  37  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  38  *
  39  * @run main/othervm -Xmx1g                                        -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  40  * @run main/othervm -Xmx1g -Xint                                  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  41  * @run main/othervm -Xmx1g -Xbatch -Xcomp                         -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  42  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  43  * @run main/othervm -Xmx1g -Xbatch -Xcomp -XX:-TieredCompilation  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC gc.epsilon.TestByteArrays
  44  */
  45 
  46 import java.util.Random;
  47 import jdk.test.lib.Utils;
  48 
  49 public class TestByteArrays {
  50   static int COUNT = Integer.getInteger("count", 3000); // ~500 MB allocation
  51 
  52   static byte[][] arr;
  53 
  54   public static void main(String[] args) throws Exception {
  55     Random r = Utils.getRandomInstance();
  56 
  57     arr = new byte[COUNT * 100][];
  58     for (int c = 0; c < COUNT; c++) {
  59       arr[c] = new byte[c * 100];
  60       for (int v = 0; v < c; v++) {
  61         arr[c][v] = (byte)(r.nextInt(255) & 0xFF);
  62       }
  63     }
  64 
  65     r = new Random(Utils.SEED);
  66     for (int c = 0; c < COUNT; c++) {
  67       byte[] b = arr[c];
  68       if (b.length != (c * 100)) {
  69         throw new IllegalStateException("Failure: length = " + b.length + ", need = " + (c*100));
  70       }
  71       for (int v = 0; v < c; v++) {
  72         byte actual = b[v];
  73         byte expected = (byte)(r.nextInt(255) & 0xFF);
  74         if (actual != expected) {
  75           throw new IllegalStateException("Failure: expected = " + expected + ", actual = " + actual);
  76         }
  77       }
  78     }
  79   }
  80 }