1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /* @test
  25  * @summary Test that garbage in the pinned region does not crash VM
  26  *
  27  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC PinnedGarbage
  28  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC PinnedGarbage
  29  *
  30  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m                       -XX:ShenandoahGCHeuristics=aggressive PinnedGarbage
  31  *
  32  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify                                       PinnedGarbage
  33  */
  34 
  35 import java.util.Arrays;
  36 import java.util.concurrent.*;
  37 
  38 public class PinnedGarbage {
  39     static {
  40         System.loadLibrary("PinnedGarbage");
  41     }
  42 
  43     private static final int NUM_RUNS      = 1_000;
  44     private static final int OBJS_COUNT    = 1_000;
  45     private static final int GARBAGE_COUNT = 1_000_000;
  46 
  47     private static native void pin(int[] a);
  48     private static native void unpin(int[] a);
  49 
  50     public static void main(String[] args) {
  51         for (int i = 0; i < NUM_RUNS; i++) {
  52             test();
  53         }
  54     }
  55 
  56     private static void test() {
  57         Object[] objs = new Object[OBJS_COUNT];
  58         for (int i = 0; i < OBJS_COUNT; i++) {
  59             objs[i] = new MyClass();
  60         }
  61 
  62         int[] cog = new int[10];
  63         int cogIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);
  64         objs[cogIdx] = cog;
  65         pin(cog);
  66 
  67         for (int i = 0; i < GARBAGE_COUNT; i++) {
  68             int rIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);
  69             if (rIdx != cogIdx) {
  70                 objs[rIdx] = new MyClass();
  71             }
  72         }
  73 
  74         unpin(cog);
  75     }
  76 
  77     public static class MyClass {
  78        public Object ref = new Object();
  79     }
  80 
  81 }