1 /*
   2  * Copyright (c) 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 /*
  26  * @test TestRefprocSanity
  27  * @summary Test that null references/referents work fine
  28  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  29  *
  30  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  31  *      -XX:+UseShenandoahGC
  32  *      -XX:+ShenandoahVerify
  33  *      TestRefprocSanity
  34  *
  35  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  36  *      -XX:+UseShenandoahGC
  37  *      TestRefprocSanity
  38  *
  39  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  40  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  41  *      TestRefprocSanity
  42  */
  43 
  44 /*
  45  * @test TestRefprocSanity
  46  * @summary Test that null references/referents work fine
  47  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  48  *
  49  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  50  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  51  *      -XX:+ShenandoahVerify
  52  *      TestRefprocSanity
  53  *
  54  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  55  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
  56  *      TestRefprocSanity
  57  *
  58  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  59  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
  60  *      TestRefprocSanity
  61  */
  62 
  63 import java.lang.ref.*;
  64 
  65 public class TestRefprocSanity {
  66 
  67     static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation
  68     static final int WINDOW = 10_000;
  69 
  70     static final Reference<MyObject>[] refs = new Reference[WINDOW];
  71 
  72     public static void main(String[] args) throws Exception {
  73         long count = TARGET_MB * 1024 * 1024 / 32;
  74         int rIdx = 0;
  75 
  76         ReferenceQueue rq = new ReferenceQueue();
  77 
  78         for (int c = 0; c < WINDOW; c++) {
  79             refs[c] = select(c, new MyObject(c), rq);
  80         }
  81 
  82         for (int c = 0; c < count; c++) {
  83             verifyRefAt(rIdx);
  84             refs[rIdx] = select(c, new MyObject(rIdx), rq);
  85 
  86             rIdx++;
  87             if (rIdx >= WINDOW) {
  88                 rIdx = 0;
  89             }
  90             while (rq.poll() != null); // drain
  91         }
  92     }
  93 
  94     static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) {
  95         switch (v % 10) {
  96             case 0:  return new SoftReference<MyObject>(null);
  97             case 1:  return new SoftReference<MyObject>(null, rq);
  98             case 2:  return new SoftReference<MyObject>(ext);
  99             case 3:  return new SoftReference<MyObject>(ext, rq);
 100             case 4:  return new WeakReference<MyObject>(null);
 101             case 5:  return new WeakReference<MyObject>(null, rq);
 102             case 6:  return new WeakReference<MyObject>(ext);
 103             case 7:  return new WeakReference<MyObject>(ext, rq);
 104             case 8:  return new PhantomReference<MyObject>(null, rq);
 105             case 9:  return new PhantomReference<MyObject>(ext, rq);
 106             default: throw new IllegalStateException();
 107         }
 108     }
 109 
 110     static void verifyRefAt(int idx) {
 111         Reference<MyObject> ref = refs[idx];
 112         MyObject mo = ref.get();
 113         if (mo != null && mo.x != idx) {
 114             throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx);
 115         }
 116     }
 117 
 118     static class MyObject {
 119         final int x;
 120 
 121         public MyObject(int x) {
 122             this.x = x;
 123         }
 124     }
 125 
 126 }