/**
* Trace a reference to an object under a mark sweep collection policy. If the object header is
* not already marked, mark the object in either the bitmap or by moving it off the treadmill, and
* enqueue the object for subsequent processing. The object is marked as (an atomic) side-effect
* of checking whether already marked.
*
* @param trace The trace being conducted.
* @param object The object to be traced.
* @return The object (there is no object forwarding in this collector, so we always return the
* same object: this could be a void method but for compliance to a more general interface).
*/
@Inline
public ObjectReference traceObject(TransitiveClosure trace, ObjectReference object) {
boolean nurseryObject = isInNursery(object);
if (!inNurseryGC || nurseryObject) {
if (testAndMark(object, markState)) {
internalMarkObject(object, nurseryObject);
trace.processNode(object);
}
}
return object;
}
