1 /*
2 * Copyright (c) 2018, Oracle and/or its affiliates. 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.jfr.event.oldobject;
27
28 import java.lang.reflect.Array;
29 import java.util.ArrayList;
30 import java.util.HashSet;
31 import java.util.List;
32 import java.util.Set;
33 import java.util.concurrent.Callable;
34
35 import jdk.jfr.Recording;
36 import jdk.jfr.consumer.RecordedEvent;
37 import jdk.jfr.consumer.RecordedObject;
38 import jdk.jfr.internal.test.WhiteBox;
39 import jdk.test.lib.jfr.EventNames;
40 import jdk.test.lib.jfr.Events;
41
42 /*
43 * @test
44 * @key jfr
45 * @requires vm.gc == "null"
46 * @library /test/lib /test/jdk
47 * @modules jdk.jfr/jdk.jfr.internal.test
48 * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestObjectDescription
49 */
50 public class TestObjectDescription {
51
52 private static final int OBJECT_DESCRIPTION_MAX_SIZE = 100;
53 private static final String CLASS_NAME = TestClassLoader.class.getName() + "$TestClass";
54 public static List<?> leaks;
55
56 public final static class MyThreadGroup extends ThreadGroup {
57 public final static String NAME = "My Thread Group";
58
59 public MyThreadGroup(String name) {
60 super(name);
61 }
62
63 // Allocate array to trigger sampling code path for interpreter / c1
64 byte[] bytes = new byte[10];
65 }
66
67 public final static class MyThread extends Thread {
68 public final static String NAME = "My Thread";
69
70 public MyThread() {
71 super(NAME);
72 }
73
74 // Allocate array to trigger sampling code path for interpreter / c1
75 byte[] bytes = new byte[10];
76 }
77
78 public static void main(String[] args) throws Exception {
79 WhiteBox.setWriteAllObjectSamples(true);
80
81 testThreadGroupName();
82 testThreadName();
83 testClassName();
84 testSize();
85 testEllipsis();
86 }
87
88 private static void testThreadName() throws Exception {
89 asseertObjectDescription(() -> {
90 List<MyThread> threads = new ArrayList<>(OldObjects.MIN_SIZE);
91 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
92 threads.add(new MyThread());
93 }
94 return threads;
95 }, "Thread Name: " + MyThread.NAME);
96 }
97
98 private static void testThreadGroupName() throws Exception {
99 asseertObjectDescription(() -> {
100 List<MyThreadGroup> groups = new ArrayList<>(OldObjects.MIN_SIZE);
101 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
102 groups.add(new MyThreadGroup("My Thread Group"));
103 }
104 return groups;
105 }, "Thread Group: " + "My Thread Group");
106 }
107
108 private static void testClassName() throws Exception {
109 asseertObjectDescription(() -> {
110 TestClassLoader testClassLoader = new TestClassLoader();
111 List<Object> classObjects = new ArrayList<>(OldObjects.MIN_SIZE);
112 for (Class<?> clazz : testClassLoader.loadClasses(OldObjects.MIN_SIZE / 20)) {
113 // Allocate array to trigger sampling code path for interpreter / c1
114 for (int i = 0; i < 20; i++) {
115 Object classArray = Array.newInstance(clazz, 20);
116 Array.set(classArray, i, clazz.newInstance());
117 classObjects.add(classArray);
118 }
119 }
120 return classObjects;
121 }, "Class Name: " + CLASS_NAME);
122 }
123
124 private static void testSize() throws Exception {
125 asseertObjectDescription(() -> {
126 List<Object> arrayLists = new ArrayList<>(OldObjects.MIN_SIZE);
127 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
128 List<Object> arrayList = new ArrayList<>();
129 arrayList.add(new Object());
130 arrayList.add(new Object());
131 arrayList.add(new Object());
132 arrayLists.add(arrayList);
133 }
134 return arrayLists;
135 }, "Size: 3");
136 }
137
138 private static void testEllipsis() throws Exception {
139 asseertObjectDescription(() -> {
140 StringBuilder sb = new StringBuilder();
141 for (int i = 0; i < 2 * OBJECT_DESCRIPTION_MAX_SIZE; i++) {
142 sb.append("x");
143 }
144 String threadName = sb.toString();
145 List<Thread> threads = new ArrayList<>();
146 for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
147 threads.add(new Thread(threadName));
148 }
149 return threads;
150 }, "xxx...");
151 }
152
153 private static void asseertObjectDescription(Callable<List<?>> callable, String text) throws Exception {
154 int iteration = 1;
155 while (true) {
156 try (Recording recording = new Recording()) {
157 System.out.println("Iteration: " + iteration);
158 recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");
159 recording.start();
160 leaks = null;
161 System.gc();
162 leaks = callable.call();
163
164 recording.stop();
165
166 List<RecordedEvent> events = Events.fromRecording(recording);
167 Set<String> objectDescriptions = extractObjectDecriptions(events);
168 for (String s : objectDescriptions) {
169 if (s.contains(text)) {
170 printDescriptions(objectDescriptions);
171 return;
172 }
173 }
174 System.out.println("Could not find object description containing text \"" + text + "\"");
175 printDescriptions(objectDescriptions);
176 System.out.println();
177 iteration++;
178 }
179 }
180 }
181
182 private static void printDescriptions(Set<String> objectDescriptions) {
183 System.out.println("Found descriptions:");
184 for (String t : objectDescriptions) {
185 System.out.println(t);
186 }
187 }
188
189 private static Set<String> extractObjectDecriptions(List<RecordedEvent> events) {
190 Set<String> objectDescriptions = new HashSet<>();
191 for (RecordedEvent e : events) {
192 objectDescriptions.addAll(extractObjectDescriptions(e.getValue("object")));
193 }
194 return objectDescriptions;
195 }
196
197 private static Set<String> extractObjectDescriptions(RecordedObject o) {
198 Set<Long> visited = new HashSet<>();
199 Set<String> descriptions = new HashSet<>();
200 while (o != null) {
201 Long memoryAddress = o.getValue("address");
202 if (visited.contains(memoryAddress)) {
203 return descriptions;
204 }
205 visited.add(memoryAddress);
206 String od = o.getValue("description");
207 if (od != null) {
208 descriptions.add(od);
209 }
210 RecordedObject referrer = o.getValue("referrer");
211 o = referrer != null ? referrer.getValue("object") : null;
212 }
213 return descriptions;
214 }
215 }