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