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