/** * 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)); }