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/*
* Copyright (c) 2007, 2022, 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.
*/
package nsk.jdi.ObjectReference.referringObjects.referringObjects002;
import nsk.share.ClassUnloader;
import nsk.share.ObjectInstancesManager;
import nsk.share.ReferringObject;
import nsk.share.TestBug;
import nsk.share.jdi.HeapwalkingDebuggee;
import java.io.*;
import java.util.*;
import jdk.test.whitebox.WhiteBox;
/*
* Class create and save given number of class instances
*/
class Instances {
Instances(Class<?> klass, int instanceCount) {
try {
for (int i = 0; i < instanceCount; i++)
instances.add(klass.newInstance());
} catch (Throwable t) {
throw new TestBug("Unexpected error during test class instantiation: " + t);
}
}
private List<Object> instances = new ArrayList<Object>();
}
/*
* Debuggee class handle request for loading classes with custom classloader and creating class instances
*/
public class referringObjects002a extends HeapwalkingDebuggee {
private Map<String, Instances> classesInstances = new HashMap<String, Instances>();
private List<ReferringObject> classReferrers = new ArrayList<ReferringObject>();
final static public String COMMAND_DELETE_CLASS_OBJECT_REFERRERS = "deleteClassObjectReferrers";
private final WhiteBox WB = WhiteBox.getWhiteBox();
public static void main(String args[]) {
new referringObjects002a().doTest(args);
}
// create references of all possible types to class object
public void createClassObjectReferrers(String className, int instanceCount) {
ClassUnloader unloader = loadedClasses.get(className);
if (unloader == null)
throw new TestBug("Unloader is null for class: " + className);
Class<?> klass = unloader.getLoadedClass();
if (klass == null)
throw new TestBug("Unloader return null class object, for classname: " + className);
classesInstances.put(className, new Instances(klass, instanceCount));
for (String referenceType : ObjectInstancesManager.allReferenceTypes)
classReferrers.add(new ReferringObject(klass, referenceType));
// force full GC with WB to ensure that weak refernces are collected
// j.l.i.MethodType has ConcurrentWeakInternSet which might contain references to TestClass1
WB.fullGC();
}
// delete all created references to class object
public void deleteClassObjectReferrers() {
classesInstances = null;
for (ReferringObject referrer : classReferrers)
referrer.delete();
classReferrers.clear();
}
public boolean parseCommand(String command) {
if (super.parseCommand(command)) {
// need do some additional actions for COMMAND_LOAD_CLASS
if (!command.startsWith(COMMAND_LOAD_CLASS))
return true;
}
try {
StreamTokenizer tokenizer = new StreamTokenizer(new StringReader(command));
tokenizer.whitespaceChars(':', ':');
if (command.startsWith(COMMAND_LOAD_CLASS)) {
tokenizer.nextToken();
if (tokenizer.nextToken() != StreamTokenizer.TT_WORD)
throw new IllegalArgumentException("Invalid command format");
String className = tokenizer.sval;
if (tokenizer.nextToken() != StreamTokenizer.TT_NUMBER)
throw new IllegalArgumentException("Invalid command format");
int instanceCount = (int) tokenizer.nval;
createClassObjectReferrers(className, instanceCount);
return true;
} else if (command.equals(COMMAND_DELETE_CLASS_OBJECT_REFERRERS)) {
deleteClassObjectReferrers();
return true;
}
} catch (IOException e) {
throw new TestBug("Invalid command format: " + command);
}
return false;
}
}
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