1 /*
2 * Copyright (c) 2017, 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 TestStringDedup
27 * @summary Test Shenandoah string deduplication implementation
28 * @key gc
29 * @requires vm.gc.Shenandoah & !vm.graal.enabled
30 * @library /test/lib
31 * @modules java.base/jdk.internal.misc:open
32 * @modules java.base/java.lang:open
33 * java.management
34 *
35 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
36 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
37 * -XX:+ShenandoahDegeneratedGC
38 * TestStringDedup
39 *
40 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
41 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
42 * -XX:-ShenandoahDegeneratedGC
43 * TestStringDedup
44 */
45
46 /*
47 * @test TestStringDedup
48 * @summary Test Shenandoah string deduplication implementation
49 * @key gc
50 * @requires vm.gc.Shenandoah & !vm.graal.enabled
51 * @library /test/lib
52 * @modules java.base/jdk.internal.misc:open
53 * @modules java.base/java.lang:open
54 * java.management
55 *
56 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
57 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
58 * TestStringDedup
59 *
60 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
61 * -XX:+UseShenandoahGC
62 * TestStringDedup
63 *
64 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
65 * -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
66 * TestStringDedup
67 */
68
69 /*
70 * @test TestStringDedup
71 * @summary Test Shenandoah string deduplication implementation
72 * @key gc
73 * @requires vm.gc.Shenandoah & !vm.graal.enabled
74 * @library /test/lib
75 * @modules java.base/jdk.internal.misc:open
76 * @modules java.base/java.lang:open
77 * java.management
78 *
79 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
80 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu
81 * TestStringDedup
82 *
83 * @run main/othervm -Xmx256m -Xlog:gc+stats -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseStringDeduplication
84 * -XX:+UseShenandoahGC -XX:ShenandoahGCMode=iu -XX:ShenandoahGCHeuristics=aggressive
85 * TestStringDedup
86 */
87
88 import java.lang.reflect.*;
89 import java.util.*;
90
91 import sun.misc.*;
92
93 public class TestStringDedup {
94 private static Field valueField;
95 private static Unsafe unsafe;
96
97 private static final int UniqueStrings = 20;
98
99 static {
100 try {
101 Field field = Unsafe.class.getDeclaredField("theUnsafe");
102 field.setAccessible(true);
103 unsafe = (Unsafe) field.get(null);
104
105 valueField = String.class.getDeclaredField("value");
106 valueField.setAccessible(true);
107 } catch (Exception e) {
108 throw new RuntimeException(e);
109 }
110 }
111
112 private static Object getValue(String string) {
113 try {
114 return valueField.get(string);
115 } catch (Exception e) {
116 throw new RuntimeException(e);
117 }
118 }
119
120 static class StringAndId {
121 private String str;
122 private int id;
123
124 public StringAndId(String str, int id) {
125 this.str = str;
126 this.id = id;
127 }
128
129 public String str() {
130 return str;
131 }
132
133 public int id() {
134 return id;
135 }
136 }
137
138 private static void generateStrings(ArrayList<StringAndId> strs, int unique_strs) {
139 Random rn = new Random();
140 for (int u = 0; u < unique_strs; u++) {
141 int n = rn.nextInt() % 10;
142 n = Math.max(n, 2);
143 for (int index = 0; index < n; index++) {
144 strs.add(new StringAndId("Unique String " + u, u));
145 }
146 }
147 }
148
149 private static int verifyDedepString(ArrayList<StringAndId> strs) {
150 HashMap<Object, StringAndId> seen = new HashMap<>();
151 int total = 0;
152 int dedup = 0;
153
154 for (StringAndId item : strs) {
155 total++;
156 StringAndId existing_item = seen.get(getValue(item.str()));
157 if (existing_item == null) {
158 seen.put(getValue(item.str()), item);
159 } else {
160 if (item.id() != existing_item.id() ||
161 !item.str().equals(existing_item.str())) {
162 System.out.println("StringDedup error:");
163 System.out.println("String: " + item.str() + " != " + existing_item.str());
164 throw new RuntimeException("StringDedup Test failed");
165 } else {
166 dedup++;
167 }
168 }
169 }
170 System.out.println("Dedup: " + dedup + "/" + total + " unique: " + (total - dedup));
171 return (total - dedup);
172 }
173
174 public static void main(String[] args) {
175 ArrayList<StringAndId> astrs = new ArrayList<>();
176 generateStrings(astrs, UniqueStrings);
177 System.gc();
178 System.gc();
179 System.gc();
180 System.gc();
181 System.gc();
182
183 if (verifyDedepString(astrs) != UniqueStrings) {
184 // Can not guarantee all strings are deduplicated, there can
185 // still have pending items in queues.
186 System.out.println("Not all strings are deduplicated");
187 }
188 }
189 }