--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/vmTestbase/metaspace/stressDictionary/StressDictionary.java Tue May 22 13:05:22 2018 -0700
@@ -0,0 +1,173 @@
+/*
+ * Copyright (c) 2013, 2018, 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
+ *
+ * @summary converted from VM Testbase metaspace/stressDictionary.
+ * VM Testbase keywords: [nonconcurrent, javac]
+ *
+ * @library /vmTestbase /test/lib
+ * @run driver jdk.test.lib.FileInstaller . .
+ * @run main/othervm metaspace.stressDictionary.StressDictionary
+ */
+
+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 vm.share.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 class FillingDictionaryWorker implements Callable<Object> {
+ @Override
+ public Object call() throws Exception {
+ while (stresser.continueExecution()) {
+ try {
+ byte[] bytecode = generateAndCompile();
+ bytecode[random.nextInt(bytecode.length)] = (byte) 42;
+ classloader.define(bytecode);
+ changeClassloaderIfRequired();
+ } 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()) {
+ byte[] bytecode = generateAndCompile();
+ Class<?> c = classloader.define(bytecode);
+ testClass(c);
+ changeClassloaderIfRequired();
+ }
+ return null;
+ }
+ }
+
+ private static String[] args;
+
+ private static final int DROP_CLASSLOADER_LIMIT = 50000;
+
+ 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);
+ List<Callable<Object>> tasks = new LinkedList<Callable<Object>>();
+ for (int i = 0; i < NUMBER_OF_CORRUPTING_THREADS; i++) {
+ tasks.add(this.new FillingDictionaryWorker());
+ }
+ for (int i = 0; i < NUMBER_OF_NOT_CORRUPTING_THREADS; i++) {
+ tasks.add(this.new RegularWorker());
+ }
+ ExecutorService executorService = Executors.newCachedThreadPool();
+ try {
+ executorService.invokeAll(tasks);
+ } catch (InterruptedException e) {
+ e.printStackTrace();
+ }
+ }
+
+ private void changeClassloaderIfRequired() {
+ if (ManagementFactory.getClassLoadingMXBean().getLoadedClassCount() > DROP_CLASSLOADER_LIMIT) {
+ ClassloaderUnderTest newOne = new ClassloaderUnderTest();
+ classloader = newOne;
+ }
+ }
+
+ private byte[] generateAndCompile() {
+ Map<String, CharSequence> sources = new HashMap<String, CharSequence>();
+ String className = "MyClass" + classesCounter.incrementAndGet();
+ sources.put(className, generateSource(className));
+ return InMemoryJavaCompiler.compile(sources).values().iterator().next();
+ }
+
+ 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);
+ }
+
+ }
+
+}