1 /*
2 * Copyright (c) 2013, 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.
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 * @test
26 *
27 * @summary converted from VM Testbase metaspace/stressDictionary.
28 * VM Testbase keywords: [nonconcurrent, javac]
29 *
30 * @library /vmTestbase /test/lib
31 * @run driver jdk.test.lib.FileInstaller . .
32 * @run main/othervm metaspace.stressDictionary.StressDictionary -stressTime 30
33 */
34
35 package metaspace.stressDictionary;
36
37 import java.util.*;
38 import java.lang.management.ManagementFactory;
39 import java.lang.reflect.InvocationTargetException;
40 import java.lang.reflect.Method;
41 import java.util.concurrent.*;
42 import java.util.concurrent.atomic.AtomicLong;
43
44 import nsk.share.gc.GCTestBase;
45 import nsk.share.test.*;
46 import vm.share.InMemoryJavaCompiler;
47
48 /**
49 * There is a data structure named "dictionary" in class BlockFreelist. It stores
50 * information about free memory blocks for further reusing. Allocation of new block goes
51 * from dictionary only if dictionary is fat enough. (At the moment of test creation this limit is 64K.)
52 * So to stress dictionary we should fill it permanently. The easiest way to fill the dictionary
53 * is to fail class loading. This failed action will return allocated blocks to dictionary.
54 *
55 * There are two type of threads in this test: threads, failing classloading and threads,
56 * loading regular classes and checking they work properly.
57 */
58 public class StressDictionary extends GCTestBase {
59
60 private static byte[] bytecode;
61
62 private class FillingDictionaryWorker implements Callable<Object> {
63 @Override
64 public Object call() throws Exception {
65 while (stresser.continueExecution()) {
66 try {
67 byte[] badBytecode = bytecode.clone();
68 badBytecode[random.nextInt(badBytecode.length)] = (byte) 42;
69 classloader.define(badBytecode);
70 } catch (Throwable e) {
71 // We can get ClassFormatError, ClassNotFoundException or anything else here
72 }
73 }
74 return null;
75 }
76 }
77
78 private class RegularWorker implements Callable<Object> {
79 @Override
80 public Object call() throws Exception {
81 while (stresser.continueExecution()) {
82 Class<?> c = classloader.define(bytecode);
83 testClass(c);
84 }
85 return null;
86 }
87 }
88
89 private static String[] args;
90
91 private static final String methodName = "myMethod";
92
93 private static final int NUMBER_OF_CORRUPTING_THREADS = 10;
94
95 private static final int NUMBER_OF_METHOD_CALLS = 50;
96
97 private static final int NUMBER_OF_NOT_CORRUPTING_THREADS = 10;
98
99 private AtomicLong classesCounter = new AtomicLong(0);
100
101 private volatile ClassloaderUnderTest classloader = new ClassloaderUnderTest();
102
103 private Random random;
104
105 private ExecutionController stresser;
106
107 public static void main(String[] args) {
108 StressDictionary.args = args;
109 Tests.runTest(new StressDictionary(), args);
110 }
111
112 public void run() {
113 random = new Random(runParams.getSeed());
114 stresser = new Stresser(args);
115 stresser.start(1);
116 // Generate some bytecodes.
117 bytecode = generateAndCompile();
118 List<Callable<Object>> tasks = new LinkedList<Callable<Object>>();
119 for (int i = 0; i < NUMBER_OF_CORRUPTING_THREADS; i++) {
120 tasks.add(this.new FillingDictionaryWorker());
121 }
122 for (int i = 0; i < NUMBER_OF_NOT_CORRUPTING_THREADS; i++) {
123 tasks.add(this.new RegularWorker());
124 }
125 ExecutorService executorService = Executors.newCachedThreadPool();
126 try {
127 executorService.invokeAll(tasks);
128 } catch (InterruptedException e) {
129 e.printStackTrace();
130 }
131 }
132
133 private byte[] generateAndCompile() {
134 Map<String, CharSequence> sources = new HashMap<String, CharSequence>();
135 String className = "MyClass" + classesCounter.incrementAndGet();
136 sources.put(className, generateSource(className));
137 return InMemoryJavaCompiler.compile(sources).values().iterator().next();
138 }
139
140 private CharSequence generateSource(String className) {
141 return "public class " + className + " { " +
142 "public static String s1 = \"s1" + random.nextInt() + "\"; " +
143 "public String s2 = \"s2" + random.nextInt() + "\"; " +
144 "public String " + methodName + "() {return s1 + s2; } " +
145 "}";
146 }
147
148 private void testClass(Class<?> clazz) {
149 try {
150 for (Method m : clazz.getMethods()) {
151 if (m.getName().equals(methodName)) {
152 for (int j = 0; j < NUMBER_OF_METHOD_CALLS; j++) {
153 m.invoke(clazz.newInstance());
154 }
155 }
156 }
157 } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
158 log.error("Class check failed: " + e.getMessage());
159 e.printStackTrace();
160 setFailed(true);
161 }
162
163 }
164
165 }