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 id=default
27 * @summary Test that null references/referents work fine
28 * @requires vm.gc.Shenandoah
29 *
30 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
31 * -XX:+UseShenandoahGC
32 * -XX:+ShenandoahVerify
33 * TestRefprocSanity
34 *
35 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
36 * -XX:+UseShenandoahGC
37 * TestRefprocSanity
38 *
39 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
40 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
41 * TestRefprocSanity
42 */
43
44 /*
45 * @test id=iu
46 * @summary Test that null references/referents work fine
47 * @requires vm.gc.Shenandoah
48 *
49 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
50 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
51 * -XX:+ShenandoahVerify
52 * TestRefprocSanity
53 *
54 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
55 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
56 * TestRefprocSanity
57 *
58 * @run main/othervm -Xmx128m -Xms128m -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", 1_000); // 1 Gb allocation
68 static final int WINDOW = 1_000;
69
70 static final Reference<MyObject>[] refs = new Reference[WINDOW];
71
72 static Object sink;
73
74 public static void main(String[] args) throws Exception {
75 long count = TARGET_MB * 1024 * 1024 / 128;
76 int rIdx = 0;
77
78 ReferenceQueue rq = new ReferenceQueue();
79
80 for (int c = 0; c < WINDOW; c++) {
81 refs[c] = select(c, new MyObject(c), rq);
82 }
83
84 for (int c = 0; c < count; c++) {
85 verifyRefAt(rIdx);
86 refs[rIdx] = select(c, new MyObject(rIdx), rq);
87
88 rIdx++;
89 if (rIdx >= WINDOW) {
90 rIdx = 0;
91 }
92
93 // Do allocations to force GCs
94 sink = new byte[100];
95
96 // Drain the refqueue
97 while (rq.poll() != null);
98 }
99 }
100
101 static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) {
102 switch (v % 10) {
103 case 0: return new SoftReference<MyObject>(null);
104 case 1: return new SoftReference<MyObject>(null, rq);
105 case 2: return new SoftReference<MyObject>(ext);
106 case 3: return new SoftReference<MyObject>(ext, rq);
107 case 4: return new WeakReference<MyObject>(null);
108 case 5: return new WeakReference<MyObject>(null, rq);
109 case 6: return new WeakReference<MyObject>(ext);
110 case 7: return new WeakReference<MyObject>(ext, rq);
111 case 8: return new PhantomReference<MyObject>(null, rq);
112 case 9: return new PhantomReference<MyObject>(ext, rq);
113 default: throw new IllegalStateException();
114 }
115 }
116
117 static void verifyRefAt(int idx) {
118 Reference<MyObject> ref = refs[idx];
119 MyObject mo = ref.get();
120 if (mo != null && mo.x != idx) {
121 throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx);
122 }
123 }
124
125 static class MyObject {
126 final int x;
127
128 public MyObject(int x) {
129 this.x = x;
130 }
131 }
132
133 }