256 lines
10 KiB
Java
256 lines
10 KiB
Java
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/*
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* Copyright (c) 2004, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @key stress gc
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*
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* @summary converted from VM Testbase gc/gctests/LargeObjects/large001.
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* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, quick]
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* VM Testbase readme:
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* DESCRIPTION
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* The test checks that Garbage Collector correctly does not throw any
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* unexpected exceptions/errors while allocating large objects (classes
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* that have more than 65535 fields and classes that have less than 65535
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* fields). 65535 of fields is a limitation for JVM (see JVM specification
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* Second edition 4.10).
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* Since it is impossible to create one class with about 65535 of fields
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* (javac cannot compile it), a child class extends a parent class, so the
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* fields are devided into two subsets. However, the child class still has
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* about 65535 of fields.
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* The test starts a number of threads. This number is either set in *.cfg
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* file or is calculated by the test itself based on the machine (see
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* nsk.share.gc.Algorithms.getThreadsCount() method). As soon as all threads
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* are started, each thread begins its checking.
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* There are 13 classes to be loaded by each thread. These classes are
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* generated by nsk.share.gc.Generator (see its javadoc for more details).
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* Each class has a huge number of fields, but this number is less than the JVM
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* limitation.
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* The test loads the classes with nsk.share.gc.GCClassUnloader class that
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* extends nsk.share.ClassUnloader and has a bit different algorith of eating
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* heap. As soon as a class is loaded, the test creates an instance of
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* it - allocates an object of that type. Then it drops references to the
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* class and to the instance and tries to unload the class. The test does not
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* expect any exceptions to be thrown.
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*
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* @library /vmTestbase
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* /test/lib
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* @run driver jdk.test.lib.FileInstaller . .
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*
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* @comment generate and compile nsk.share.gc.newclass.* classes
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* @run driver nsk.share.gc.GenClassesBuilder
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*
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* @run main/othervm
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* -XX:-UseGCOverheadLimit
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* -Xlog:gc*
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* gc.gctests.LargeObjects.large001.large001
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* -largeClassesPath classes
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* -isOverLimitFields false
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* -aggregationDepth 0
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* -t 1
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*/
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package gc.gctests.LargeObjects.large001;
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import java.lang.reflect.*;
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import java.lang.ref.WeakReference;
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import java.util.*;
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import nsk.share.TestFailure;
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import nsk.share.gc.*;
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import nsk.share.*;
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public class large001 extends ThreadedGCTest {
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// Package of the classes to be loaded
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final static String PREFIX = "nsk.share.gc.newclass.";
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// A bunch of classes that have number of fields more than JVM limitation
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final static String[] LCLASSES = {PREFIX + "private_int_lchild",
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PREFIX + "protected_short_lchild",
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PREFIX + "public_long_lchild",
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PREFIX + "public_Object_lchild",
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PREFIX + "static_byte_lchild",
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PREFIX + "static_float_lchild",
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PREFIX + "transient_boolean_lchild",
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PREFIX + "volatile_double_lchild",
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PREFIX + "protected_combination_lchild",
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PREFIX + "public_combination_lchild",
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PREFIX + "static_combination_lchild",
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PREFIX + "transient_combination_lchild",
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PREFIX + "volatile_combination_lchild"
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};
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// A bunch of classes that have number of fields less than JVM limitation
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final static String[] SCLASSES = {PREFIX + "private_int_schild",
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PREFIX + "protected_short_schild",
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PREFIX + "public_long_schild",
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PREFIX + "public_Object_schild",
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PREFIX + "static_byte_schild",
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PREFIX + "static_float_schild",
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PREFIX + "transient_boolean_schild",
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PREFIX + "volatile_double_schild",
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PREFIX + "protected_combination_schild",
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PREFIX + "public_combination_schild",
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PREFIX + "static_combination_schild",
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PREFIX + "transient_combination_schild",
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PREFIX + "volatile_combination_schild"
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};
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boolean isOverLimitFields = true;
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int aggregationDepth = 0;
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String largeClassesPath;
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private class Worker implements Runnable {
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int id;
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public Worker(int id) {
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this.id = id;
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}
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public void run() {
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try {
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// Use special ClassUnloader to load/unload classes
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ClassUnloader unloader = new ClassUnloader();
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String[] classes = isOverLimitFields ? LCLASSES : SCLASSES;
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for (String name : classes) {
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// Load the class
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log.debug(id + ": Loading class: " + name);
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unloader.loadClass(name, largeClassesPath);
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log.debug(id + ": Class loaded: " + name);
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Class loadedClass = unloader.getLoadedClass();
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Object loadedClassInstance = loadedClass.newInstance();
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log.debug(id + ": Instance of the class: " + loadedClassInstance);
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int depth = aggregationDepth;
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List<WeakReference> refs = new ArrayList<WeakReference>(depth);
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addObjRef(loadedClassInstance, loadedClass, depth, refs);
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// Drop all references to the class and try to unload it
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Algorithms.eatMemory(getExecutionController());
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log.debug(id + ": Testing non-null after GC force for: " + name);
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if (loadedClass == null || loadedClassInstance == null) {
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throw new Exception("Null class");
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}
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verifyObjRef(loadedClassInstance, depth);
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for (WeakReference ref : refs) {
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if (ref.get() == null) {
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throw new Exception("Unexpected null reference");
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}
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}
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refs = null;
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loadedClass = null;
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loadedClassInstance = null;
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log.debug(id + ": Unloading class: "
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+ name);
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boolean result = unloader.unloadClass(getExecutionController());
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log.debug(id + ": Result of uloading "
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+ "class " + name + ": " + result);
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}
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} catch (OutOfMemoryError oome) {
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// just skip if we eat memory in several threads...
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// rethrow in the case of one thread
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if (runParams.getNumberOfThreads() == 1) {
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throw oome;
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}
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} catch (Throwable t) {
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throw new TestFailure("Unexpected exception: ", t);
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}
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}
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// This method recursively create chain of aggregated objects for given object
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public void addObjRef(Object object, Class clazz, int count, List<WeakReference> list) throws Throwable {
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if (count == 0) {
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return;
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}
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Field[] fields = object.getClass().getFields();
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for (Field field : fields) {
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if (field.getName().startsWith("obj")) {
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Object addedObject = clazz.newInstance();
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field.set(object, addedObject);
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System.out.println("Added field " + field.getName() + " .... " + count);
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addObjRef(addedObject, clazz, count - 1, list);
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list.add(new WeakReference<Object>(addedObject));
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}
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}
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}
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// This method recursively verfiy chain of aggregated objects for given object.
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// Throws null pointer exception of objP/C field is null
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public void verifyObjRef(Object object, int count) throws Throwable {
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if (count == 0) {
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return;
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}
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Field[] fields = object.getClass().getFields();
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for (Field field : fields) {
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if (field.getName().startsWith("obj")) {
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Object obj = field.get(object);
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verifyObjRef(obj, count - 1);
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}
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}
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}
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}
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public large001(String[] args) {
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for (int i = 0; i < args.length; i++) {
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if (args[i].equals("-largeClassesPath")) {
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largeClassesPath = args[++i];
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} else if (args[i].equals("-isOverLimitFields")) {
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isOverLimitFields = Boolean.getBoolean(args[++i]);
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} else if (args[i].equals("-aggregationDepth")) {
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aggregationDepth = Integer.parseInt(args[++i]);
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}
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}
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if (largeClassesPath == null || largeClassesPath.length() == 0) {
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throw new TestFailure("No classpath for large classes is given");
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}
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}
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@Override
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protected Runnable createRunnable(int i) {
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return new Worker(i);
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}
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@Override
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public void run() {
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if (isOverLimitFields) {
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log.debug("Loading classes that have number "
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+ "of fields over limitation (more "
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+ "than 65535)");
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} else {
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log.debug("Loading classes that have number "
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+ "of fields under limitation (less "
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+ "than 65535)");
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}
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super.run();
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}
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public static void main(String args[]) {
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GC.runTest(new large001(args), args);
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}
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}
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