/** Fallback */
public static void fallback(Object object, TransitiveClosure trace) {
ObjectReference objectRef = ObjectReference.fromObject(object);
RVMType type = ObjectModel.getObjectType(objectRef.toObject());
if (type.isClassType()) {
RVMClass klass = type.asClass();
int[] offsets = klass.getReferenceOffsets();
for (int i = 0; i < offsets.length; i++) {
trace.processEdge(objectRef, objectRef.toAddress().plus(offsets[i]));
}
} else if (type.isArrayType() && type.asArray().getElementType().isReferenceType()) {
for (int i = 0; i < ObjectModel.getArrayLength(objectRef.toObject()); i++) {
trace.processEdge(objectRef, objectRef.toAddress().plus(i << LOG_BYTES_IN_ADDRESS));
}
}
}
/**
* Push an address onto the address stack.
*
* @param object the object to be pushed onto the object queue
*/
@Inline
public final void push(ObjectReference object) {
Address addr = object.toAddress();
if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(!addr.isZero());
checkHeadInsert(1);
uncheckedHeadInsert(addr);
}
/**
* Trace a reference during GC. This involves determining which collection policy applies and
* calling the appropriate <code>trace</code> method.
*
* @param target The object the interior edge points within.
* @param slot The location of the interior edge.
* @param root True if this is a root edge.
*/
public final void processInteriorEdge(ObjectReference target, Address slot, boolean root) {
Address interiorRef = slot.loadAddress();
Offset offset = interiorRef.diff(target.toAddress());
ObjectReference newTarget = traceObject(target, root);
if (VM.VERIFY_ASSERTIONS) {
if (offset.sLT(Offset.zero()) || offset.sGT(Offset.fromIntSignExtend(1 << 24))) {
// There is probably no object this large
Log.writeln("ERROR: Suspiciously large delta to interior pointer");
Log.write(" object base = ");
Log.writeln(target);
Log.write(" interior reference = ");
Log.writeln(interiorRef);
Log.write(" delta = ");
Log.writeln(offset);
VM.assertions._assert(false);
}
}
slot.store(newTarget.toAddress().plus(offset));
}
/**
* Return true if the object resides within the nursery
*
* @param obj The object to be tested
* @return true if the object resides within the nursery
*/
@Inline
static boolean inNursery(ObjectReference obj) {
return inNursery(obj.toAddress());
}