{
A a = new A();
B b = a.b;
final ArrayList list = new ArrayList();
JVMTIInterface jvmti = new JVMTIInterface();
jvmti.notifyOnReferences("/tmp/tst.refs",new JVMTICallBack(){
int count=0;
public void notifyReference(long referenceHolder, long referencedObject,long classTag, long index, long method, byte referenceType)
{
list.add(new ReferenceDataPoint(referenceHolder, referencedObject,classTag, index, method, referenceType));
}
public void notifyClass(long classTag, Class clazz) {
fail("This shouldn't be called now");
}
public void notifyObject(long classTag, long objectId, long bytes) {
fail("This shouldn't be called now");
}
});
long tag = jvmti.getTagOnObject(a);
Object newObject = jvmti.getObjectOnTag(tag);
assertSame(a,newObject);
int count=0;
Iterator iter = list.iterator();
while (iter.hasNext())
{
ReferenceDataPoint point = (ReferenceDataPoint)iter.next();
//System.out.println("point=" + point);
if (point.getClassTag()!=0 )
{
Object obj = jvmti.getObjectOnTag(point.getClassTag());
if (!(obj instanceof Class))
{
System.out.println("point=" + point);
System.out.println("obj=" + obj);
fail("Object was supposed to be a Class");
}
}
if (point.getReferenceType()==JVMTICallBack.JVMTI_REFERENCE_STATIC_FIELD || point.getReferenceType()==JVMTICallBack.JVMTI_REFERENCE_FIELD)
{
try
{
Object referenced = jvmti.getObjectOnTag(point.getReferencedObject());
Object obj = jvmti.getObjectOnTag(point.getReferenceHolder());
Field field = jvmti.getObjectField(obj .getClass(),(int)point.getIndex());
Class clazz = (Class)jvmti.getObjectOnTag(point.getClassTag());
/*if (field==null)
{
System.out.println(point);
System.out.println(referenced + " couldn't find field " +point.getIndex() + " on " + obj);
Field field2 = jvmti.getObjectField(obj .getClass(),(int)point.getIndex());
}
assertNotNull(field); -- I would like to enforce this, but it seems impossible due to internal classes on JVM */
}
catch (NullPointerException e)
{
}
}
else if (point.getReferenceType()==JVMTICallBack.THREAD_REFERENCE)
{
try
{
Object classTag = jvmti.getObjectOnTag(point.getClassTag());
Object objReferenced = jvmti.getObjectOnTag(point.getReferencedObject());
Object objHolder = jvmti.getObjectOnTag(point.getReferenceHolder());
String methodName= jvmti.getMethodClass(point.getMethod()).getName() + "::" +
jvmti.getMethodName(point.getMethod()) + jvmti.getMethodSignature(point.getMethod());
//System.out.println(objReferenced + " being referenced at "+methodName);
}
catch (NullPointerException e)
{
// this can happen here;
}
}
}
System.out.println();
long tagOnA = jvmti.getTagOnObject(a.b);
iter = list.iterator();
while (iter.hasNext())
{
ReferenceDataPoint point = (ReferenceDataPoint)iter.next();
if (tagOnA == point.getReferencedObject() && (point.getReferenceType()==JVMTICallBack.JVMTI_REFERENCE_FIELD || point.getReferenceType()==JVMTICallBack.JVMTI_REFERENCE_STATIC_FIELD))
{
Object obj = jvmti.getObjectOnTag(point.getReferenceHolder());
Field field = null;
if (point.getReferenceType()==JVMTICallBack.JVMTI_REFERENCE_FIELD)
{
field = jvmti.getObjectField((Class)obj.getClass() ,(int)point.getIndex());
}
else
{
field = jvmti.getObjectField((Class)obj ,(int)point.getIndex());
}
System.out.println(obj + " being referenced at " + field);
}
else if (tagOnA == point.getReferencedObject() && (point.getReferenceType()==JVMTICallBack.THREAD_REFERENCE))
{
Object classTag = jvmti.getObjectOnTag(point.getClassTag());
Object objReferenced = jvmti.getObjectOnTag(point.getReferencedObject());
Object objHolder = jvmti.getObjectOnTag(point.getReferenceHolder());
System.out.println("classTag=" + classTag);
System.out.println("objReferenced=" + objReferenced);
System.out.println("objHolder=" + objHolder);
System.out.println("name=" +jvmti.getMethodClass(point.getMethod()).getName() + "::" +
jvmti.getMethodName(point.getMethod()) + jvmti.getMethodSignature(point.getMethod()));
}
}
try
{
jvmti.getObjectOnTag(0);
fail("Supposed to throw an exception");
}
catch (Throwable e)
{
}
try
{
jvmti.getObjectOnTag(-1);
fail("Supposed to throw an exception");
}
catch (Throwable e)
{
}
jvmti.releaseTags();
assertEquals(0,jvmti.getTagOnObject(a));
}