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 /*
  25  * @test TestRefprocSanity
  26  * @summary Test that null references/referents work fine
  27  * @key gc
  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  * @key gc
  48  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  49  *
  50  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  51  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal
  52  *      -XX:+ShenandoahVerify
  53  *      TestRefprocSanity
  54  *
  55  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  56  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal
  57  *      TestRefprocSanity
  58  *
  59  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  60  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=traversal -XX:ShenandoahGCHeuristics=aggressive
  61  *      TestRefprocSanity
  62  */
  63 
  64 import java.lang.ref.*;
  65 
  66 public class TestRefprocSanity {
  67 
  68     static final long TARGET_MB = Long.getLong("target", 10_000); // 10 Gb allocation
  69     static final int WINDOW = 10_000;
  70 
  71     static final Reference<MyObject>[] refs = new Reference[WINDOW];
  72 
  73     public static void main(String[] args) throws Exception {
  74         long count = TARGET_MB * 1024 * 1024 / 32;
  75         int rIdx = 0;
  76 
  77         ReferenceQueue rq = new ReferenceQueue();
  78 
  79         for (int c = 0; c < WINDOW; c++) {
  80             refs[c] = select(c, new MyObject(c), rq);
  81         }
  82 
  83         for (int c = 0; c < count; c++) {
  84             verifyRefAt(rIdx);
  85             refs[rIdx] = select(c, new MyObject(rIdx), rq);
  86 
  87             rIdx++;
  88             if (rIdx >= WINDOW) {
  89                 rIdx = 0;
  90             }
  91             while (rq.poll() != null); // drain
  92         }
  93     }
  94 
  95     static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) {
  96         switch (v % 10) {
  97             case 0:  return new SoftReference<MyObject>(null);
  98             case 1:  return new SoftReference<MyObject>(null, rq);
  99             case 2:  return new SoftReference<MyObject>(ext);
 100             case 3:  return new SoftReference<MyObject>(ext, rq);
 101             case 4:  return new WeakReference<MyObject>(null);
 102             case 5:  return new WeakReference<MyObject>(null, rq);
 103             case 6:  return new WeakReference<MyObject>(ext);
 104             case 7:  return new WeakReference<MyObject>(ext, rq);
 105             case 8:  return new PhantomReference<MyObject>(null, rq);
 106             case 9:  return new PhantomReference<MyObject>(ext, rq);
 107             default: throw new IllegalStateException();
 108         }
 109     }
 110 
 111     static void verifyRefAt(int idx) {
 112         Reference<MyObject> ref = refs[idx];
 113         MyObject mo = ref.get();
 114         if (mo != null && mo.x != idx) {
 115             throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx);
 116         }
 117     }
 118 
 119     static class MyObject {
 120         final int x;
 121 
 122         public MyObject(int x) {
 123             this.x = x;
 124         }
 125     }
 126 
 127 }