/** {@inheritDoc} */
@Override
public boolean isLive(ObjectReference object) {
if (object.isNull()) return false;
if (Space.isInSpace(SS.SS0, object)) return SS.hi ? SS.copySpace0.isLive(object) : true;
if (Space.isInSpace(SS.SS1, object)) return SS.hi ? true : SS.copySpace1.isLive(object);
return super.isLive(object);
}
/**
* This method is the core method during the trace of the object graph. The role of this method is
* to:
*
* <p>1. Ensure the traced object is not collected. 2. If this is the first visit to the object
* enqueue it to be scanned. 3. Return the forwarded reference to the object.
*
* <p>In this instance, we refer objects in the mark-sweep space to the immixSpace for tracing,
* and defer to the superclass for all others.
*
* @param object The object to be traced.
* @return The new reference to the same object instance.
*/
@Inline
public ObjectReference traceObject(ObjectReference object) {
if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(Immix.immixSpace.inImmixDefragCollection());
if (object.isNull()) return object;
if (Space.isInSpace(Immix.IMMIX, object))
return Immix.immixSpace.traceObject(this, object, Plan.ALLOC_DEFAULT);
return super.traceObject(object);
}
/**
* Given a slot (ie the address of an ObjectReference), ensure that the referent will not move for
* the rest of the GC. This is achieved by calling the precopyObject method.
*
* @param slot The slot to check
*/
@Inline
public final void processPrecopyEdge(Address slot) {
ObjectReference child = slot.loadObjectReference();
if (!child.isNull()) {
child = precopyObject(child);
slot.store(child);
}
}
/**
* Is the specified object live?
*
* @param object The object.
* @return True if the object is live.
*/
public boolean isLive(ObjectReference object) {
if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(Immix.immixSpace.inImmixDefragCollection());
if (object.isNull()) return false;
if (Space.isInSpace(Immix.IMMIX, object)) {
return Immix.immixSpace.isLive(object);
}
return super.isLive(object);
}
@Override
@Inline
public ObjectReference traceObject(ObjectReference object) {
if (object.isNull()) return object;
if (Space.isInSpace(SS.SS0, object))
return SS.copySpace0.traceObject(this, object, SS.ALLOC_SS);
if (Space.isInSpace(SS.SS1, object))
return SS.copySpace1.traceObject(this, object, SS.ALLOC_SS);
return super.traceObject(object);
}