internal jvmtiError AddGlobalReference(JvmtiEnvironment environment, JniEnvironment nativeEnvironment, jobject obj)
{
long tag;
jvmtiError error = environment.GetTag(obj, out tag);
if (error != jvmtiError.None)
{
return(error);
}
if (tag == 0)
{
return(jvmtiError.IllegalArgument);
}
_globalReferences.AddOrUpdate(tag,
t =>
{
return(Tuple.Create(nativeEnvironment.NewGlobalReference(obj), 1));
},
(t, v) =>
{
if (v.Item2 == 0)
{
return(Tuple.Create(nativeEnvironment.NewGlobalReference(obj), 1));
}
else
{
return(Tuple.Create(v.Item1, v.Item2 + 1));
}
});
return(jvmtiError.None);
}
internal jvmtiError RemoveGlobalReference(JvmtiEnvironment environment, JniEnvironment nativeEnvironment, jobject obj)
{
long tag;
jvmtiError error = environment.GetTag(obj, out tag);
if (error != jvmtiError.None)
{
return(error);
}
if (tag == 0)
{
return(jvmtiError.IllegalArgument);
}
var result = _globalReferences.AddOrUpdate(tag,
t =>
{
return(Tuple.Create(jobject.Null, 0));
},
(t, v) =>
{
if (v.Item2 == 0)
{
return(Tuple.Create(jobject.Null, 0));
}
else if (v.Item2 == 1)
{
nativeEnvironment.DeleteGlobalReference(v.Item1);
return(Tuple.Create(jobject.Null, 0));
}
else
{
return(Tuple.Create(v.Item1, v.Item2 - 1));
}
});
return(jvmtiError.None);
}
internal TaggedObjectId TrackLocalObjectReference(jobject @object, JvmtiEnvironment environment, JniEnvironment nativeEnvironment, bool freeLocalReference)
{
if (@object == jobject.Null)
{
return(new TaggedObjectId(Tag.Object, new ObjectId(0), default(TaggedReferenceTypeId)));
}
long tag;
JvmtiErrorHandler.ThrowOnFailure(environment.GetTag(@object, out tag));
TaggedReferenceTypeId type = default(TaggedReferenceTypeId);
Tag objectKind;
if (tag == 0)
{
long uniqueTag = Interlocked.Increment(ref _nextTag);
/* first figure out what type of object we're dealing with. could be:
* - String
* - Thread
* - ThreadGroup
* - ClassLoader
* - ClassObject
* - Array
* - Object
*/
// check for array
jclass objectClass = nativeEnvironment.GetObjectClass(@object);
try
{
type = TrackLocalClassReference(objectClass, environment, nativeEnvironment, false);
bool isArray = type.TypeTag == TypeTag.Array;
if (isArray)
{
objectKind = Tag.Array;
}
else
{
if (_stringClass != jclass.Null && nativeEnvironment.IsInstanceOf(@object, _stringClass))
{
objectKind = Tag.String;
}
else if (_threadClass != jclass.Null && nativeEnvironment.IsInstanceOf(@object, _threadClass))
{
objectKind = Tag.Thread;
}
else if (_threadGroupClass != jclass.Null && nativeEnvironment.IsInstanceOf(@object, _threadGroupClass))
{
objectKind = Tag.ThreadGroup;
}
else if (_classClass != jclass.Null && nativeEnvironment.IsInstanceOf(@object, _classClass))
{
objectKind = Tag.ClassObject;
}
else if (_classLoaderClass != jclass.Null && nativeEnvironment.IsInstanceOf(@object, _classLoaderClass))
{
objectKind = Tag.ClassLoader;
}
else
{
objectKind = Tag.Object;
}
}
}
finally
{
nativeEnvironment.DeleteLocalReference(objectClass);
}
tag = (uniqueTag << 8) | (uint)objectKind;
JvmtiErrorHandler.ThrowOnFailure(environment.SetTag(@object, tag));
lock (_objects)
{
_objects.Add(new ObjectId(tag), nativeEnvironment.NewWeakGlobalReference(@object));
}
}
else
{
jclass objectClass = nativeEnvironment.GetObjectClass(@object);
type = TrackLocalClassReference(objectClass, environment, nativeEnvironment, true);
}
if (freeLocalReference)
{
nativeEnvironment.DeleteLocalReference(@object);
}
objectKind = (Tag)(tag & 0xFF);
return(new TaggedObjectId(objectKind, new ObjectId(tag), type));
}