1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 /*
27 * @test id=default
28 * @summary Test that null references/referents work fine
29 * @requires vm.gc.Shenandoah
30 *
31 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
32 * -XX:+UseShenandoahGC
33 * -XX:+ShenandoahVerify
34 * TestRefprocSanity
35 *
36 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
37 * -XX:+UseShenandoahGC
38 * TestRefprocSanity
39 *
40 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
41 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
42 * TestRefprocSanity
43 */
44
45 /*
46 * @test id=generational
47 * @summary Test that null references/referents work fine
48 * @requires vm.gc.Shenandoah
49 *
50 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
51 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational
52 * -XX:+ShenandoahVerify
53 * TestRefprocSanity
54 *
55 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
56 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational
57 * TestRefprocSanity
58 */
59
60 /*
61 * @test id=iu
62 * @summary Test that null references/referents work fine
63 * @requires vm.gc.Shenandoah
64 *
65 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
66 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
67 * -XX:+ShenandoahVerify
68 * TestRefprocSanity
69 *
70 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
71 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
72 * TestRefprocSanity
73 *
74 * @run main/othervm -Xmx128m -Xms128m -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
75 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
76 * TestRefprocSanity
77 */
78
79 import java.lang.ref.*;
80
81 public class TestRefprocSanity {
82
83 static final long TARGET_MB = Long.getLong("target", 1_000); // 1 Gb allocation
84 static final int WINDOW = 1_000;
85
86 static final Reference<MyObject>[] refs = new Reference[WINDOW];
87
88 static Object sink;
89
90 public static void main(String[] args) throws Exception {
91 long count = TARGET_MB * 1024 * 1024 / 128;
92 int rIdx = 0;
93
94 ReferenceQueue rq = new ReferenceQueue();
95
96 for (int c = 0; c < WINDOW; c++) {
97 refs[c] = select(c, new MyObject(c), rq);
98 }
99
100 for (int c = 0; c < count; c++) {
101 verifyRefAt(rIdx);
102 refs[rIdx] = select(c, new MyObject(rIdx), rq);
103
104 rIdx++;
105 if (rIdx >= WINDOW) {
106 rIdx = 0;
107 }
108
109 // Do allocations to force GCs
110 sink = new byte[100];
111
112 // Drain the refqueue
113 while (rq.poll() != null);
114 }
115 }
116
117 static Reference<MyObject> select(int v, MyObject ext, ReferenceQueue rq) {
118 switch (v % 10) {
119 case 0: return new SoftReference<MyObject>(null);
120 case 1: return new SoftReference<MyObject>(null, rq);
121 case 2: return new SoftReference<MyObject>(ext);
122 case 3: return new SoftReference<MyObject>(ext, rq);
123 case 4: return new WeakReference<MyObject>(null);
124 case 5: return new WeakReference<MyObject>(null, rq);
125 case 6: return new WeakReference<MyObject>(ext);
126 case 7: return new WeakReference<MyObject>(ext, rq);
127 case 8: return new PhantomReference<MyObject>(null, rq);
128 case 9: return new PhantomReference<MyObject>(ext, rq);
129 default: throw new IllegalStateException();
130 }
131 }
132
133 static void verifyRefAt(int idx) {
134 Reference<MyObject> ref = refs[idx];
135 MyObject mo = ref.get();
136 if (mo != null && mo.x != idx) {
137 throw new IllegalStateException("Referent tag is incorrect: " + mo.x + ", should be " + idx);
138 }
139 }
140
141 static class MyObject {
142 final int x;
143
144 public MyObject(int x) {
145 this.x = x;
146 }
147 }
148
149 }