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/*
* Copyright (c) 2003, 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.jvmti.ObjectFree;
import java.io.*;
import nsk.share.*;
import nsk.share.jvmti.*;
/**
* This test exercises the JVMTI event <code>ObjectFree</code>.
* <br>It verifies that the JVMTI raw monitor, memory management,
* and environment local storage functions can be used during processing
* this event.<p>
* The test works as follows. The special class <code>objfree001u</code>
* is loaded from directory <code>loadclass</code> by a custom class
* loader. Instance of <code>objfree001u</code> stored in field
* <code>unClsObj</code> is tagged by the agent via SetTag(). Then
* the class is tried to be unloaded. Received <code>ObjectFree</code>
* event is checked to have previously set tag. The JVMTI functions
* mentioned above should be invoked sucessfully during the event callback
* as well. If there are no ObjectFree events, the test passes with
* appropriate message.
*/
public class objfree001 {
/**
* number of dummy object created to provoke a tested instance
* to be GC'ed
*/
private final int OBJ_NUM = 10000;
/**
* class signature to be loaded and then unloaded
*/
private final static String CLS_TO_BE_UNLOADED =
"nsk.jvmti.ObjectFree.objfree001u";
/**
* Object to be tagged in the agent part of the test
*/
Object unClsObj = null;
private Log log;
static {
try {
System.loadLibrary("objfree001");
} catch (UnsatisfiedLinkError ule) {
System.err.println("Could not load \"objfree001\" library");
System.err.println("java.library.path:"
+ System.getProperty("java.library.path"));
throw ule;
}
}
native void setTag(Object objToTag);
native void inform(boolean clsUnloaded);
public static void main(String[] argv) {
argv = nsk.share.jvmti.JVMTITest.commonInit(argv);
// produce JCK-like exit status
System.exit(run(argv, System.out) + Consts.JCK_STATUS_BASE);
}
public static int run(String argv[], PrintStream out) {
return new objfree001().runThis(argv, out);
}
private int runThis(String argv[], PrintStream out) {
ArgumentHandler argHandler = new ArgumentHandler(argv);
log = new Log(out, argHandler);
String args[] = argHandler.getArguments();
if (args.length <= 1)
throw new Failure("TEST BUG: path for class to be loaded and/or number of GC() calls\n"
+ "\tis not specified");
String location = args[0];
String clsDir = location + File.separator + "loadclass";
ClassUnloader clsUnLoader = new ClassUnloader();
try {
int callNum = Integer.parseInt(args[1]);
// load the class
log.display("\nTrying to load class from "
+ clsDir + " ...");
clsUnLoader.loadClass(CLS_TO_BE_UNLOADED, clsDir);
Class unCls = clsUnLoader.getLoadedClass();
log.display("Creating instance of \""
+ unCls + "\" ...");
unClsObj = unCls.newInstance();
log.display("Instance created: " + unClsObj.toString()
+ "\n\tgetClass=" + unClsObj.getClass() + "\n");
// set tag for an instance of the class
setTag(unClsObj);
// unload the class
log.display("Trying to unload \""
+ unCls + "\" ...");
Object obj[] = new Object[OBJ_NUM];
for (int i=0; i<OBJ_NUM; i++) {
obj[i] = new Object();
}
unClsObj = null;
unCls = null;
for (int i=0; i<OBJ_NUM; i++) {
obj[i] = null;
}
boolean clsUnloaded = clsUnLoader.unloadClass();
clsUnLoader = null;
for (int i=0; i<callNum; i++)
System.gc();
log.display("Unloading of the class has"
+ new String((clsUnloaded)? " ":" not ")
+ "been detected"
+ new String((clsUnloaded)? "!\n":"\n"));
inform(clsUnloaded);
return Consts.TEST_PASSED;
} catch(Exception e) {
e.printStackTrace(log.getOutStream());
throw new Failure("TEST FAILURE: caught unexpected "
+ e);
}
}
}
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