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/*
* Copyright (c) 2013, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @key randomness
*
* @summary converted from VM Testbase metaspace/stressDictionary.
* VM Testbase keywords: [nonconcurrent, javac]
*
* @library /vmTestbase /test/lib
* @run main/othervm/timeout=600 metaspace.stressDictionary.StressDictionary -stressTime 30
*/
package metaspace.stressDictionary;
import java.util.*;
import java.lang.management.ManagementFactory;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicLong;
import nsk.share.gc.GCTestBase;
import nsk.share.test.*;
import jdk.test.lib.compiler.InMemoryJavaCompiler;
/**
* There is a data structure named "dictionary" in class BlockFreelist. It stores
* information about free memory blocks for further reusing. Allocation of new block goes
* from dictionary only if dictionary is fat enough. (At the moment of test creation this limit is 64K.)
* So to stress dictionary we should fill it permanently. The easiest way to fill the dictionary
* is to fail class loading. This failed action will return allocated blocks to dictionary.
*
* There are two type of threads in this test: threads, failing classloading and threads,
* loading regular classes and checking they work properly.
*/
public class StressDictionary extends GCTestBase {
private static byte[] bytecode;
private class FillingDictionaryWorker implements Callable<Object> {
private final Random random;
public FillingDictionaryWorker(long seed) {
this.random = new Random(seed);
}
@Override
public Object call() throws Exception {
while (stresser.continueExecution()) {
try {
byte[] badBytecode = bytecode.clone();
badBytecode[random.nextInt(badBytecode.length)] = (byte) 42;
classloader.define(badBytecode);
} catch (Throwable e) {
// We can get ClassFormatError, ClassNotFoundException or anything else here
}
}
return null;
}
}
private class RegularWorker implements Callable<Object> {
@Override
public Object call() throws Exception {
while (stresser.continueExecution()) {
Class<?> c = classloader.define(bytecode);
testClass(c);
}
return null;
}
}
private static String[] args;
private static final String methodName = "myMethod";
private static final int NUMBER_OF_CORRUPTING_THREADS = 10;
private static final int NUMBER_OF_METHOD_CALLS = 50;
private static final int NUMBER_OF_NOT_CORRUPTING_THREADS = 10;
private AtomicLong classesCounter = new AtomicLong(0);
private volatile ClassloaderUnderTest classloader = new ClassloaderUnderTest();
private Random random;
private ExecutionController stresser;
public static void main(String[] args) {
StressDictionary.args = args;
Tests.runTest(new StressDictionary(), args);
}
public void run() {
random = new Random(runParams.getSeed());
stresser = new Stresser(args);
stresser.start(1);
// Generate some bytecodes.
bytecode = generateAndCompile();
List<Callable<Object>> tasks = new LinkedList<Callable<Object>>();
for (int i = 0; i < NUMBER_OF_CORRUPTING_THREADS; i++) {
tasks.add(this.new FillingDictionaryWorker(random.nextLong()));
}
for (int i = 0; i < NUMBER_OF_NOT_CORRUPTING_THREADS; i++) {
tasks.add(this.new RegularWorker());
}
ExecutorService executorService = Executors.newCachedThreadPool();
List<Future<Object>> results = null;
try {
results = executorService.invokeAll(tasks);
} catch (InterruptedException e) {
e.printStackTrace();
}
int act_results = results.size();
int exp_results = NUMBER_OF_CORRUPTING_THREADS +
NUMBER_OF_NOT_CORRUPTING_THREADS;
if (act_results == exp_results) {
System.err.println("INFO: There are " + act_results + " results.");
} else {
throw new RuntimeException("Wrong # of results from invokeAll(); "
+ "exp_results=" + exp_results + "; "
+ "act_results=" + act_results + ".");
}
int cancelled_cnt = 0;
int not_done_cnt = 0;
for (int i = 0; i < act_results; i++) {
if (!results.get(i).isDone()) {
not_done_cnt++;
System.err.println("ERROR: task #" + i + " is not done.");
}
if (results.get(i).isCancelled()) {
cancelled_cnt++;
System.err.println("ERROR: task #" + i + " was canceled.");
}
}
if (cancelled_cnt == 0) {
System.err.println("INFO: no tasks were cancelled.");
}
if (not_done_cnt == 0) {
System.err.println("INFO: all tasks are done.");
}
if (cancelled_cnt != 0 && not_done_cnt != 0) {
throw new RuntimeException(cancelled_cnt
+ " tasks were cancelled and "
+ not_done_cnt
+ " tasks are not done.");
} else if (cancelled_cnt != 0) {
throw new RuntimeException(cancelled_cnt
+ " tasks were cancelled.");
} else if (not_done_cnt != 0) {
throw new RuntimeException(not_done_cnt + " tasks are not done.");
}
}
private byte[] generateAndCompile() {
String className = "MyClass" + classesCounter.incrementAndGet();
return InMemoryJavaCompiler.compile(className, generateSource(className));
}
private CharSequence generateSource(String className) {
return "public class " + className + " { " +
"public static String s1 = \"s1" + random.nextInt() + "\"; " +
"public String s2 = \"s2" + random.nextInt() + "\"; " +
"public String " + methodName + "() {return s1 + s2; } " +
"}";
}
private void testClass(Class<?> clazz) {
try {
for (Method m : clazz.getMethods()) {
if (m.getName().equals(methodName)) {
for (int j = 0; j < NUMBER_OF_METHOD_CALLS; j++) {
m.invoke(clazz.newInstance());
}
}
}
} catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
log.error("Class check failed: " + e.getMessage());
e.printStackTrace();
setFailed(true);
}
}
}
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