internal unsafe override void Visit(UIntPtr *loc)
            {
                UIntPtr  addr     = *loc;
                UIntPtr  page     = PageTable.Page(addr);
                PageType pageType = PageTable.Type(page);

                if (!PageTable.IsZombiePage(pageType))
                {
                    VTable.Assert(PageTable.IsGcPage(pageType) ||
                                  PageTable.IsNonGcPage(pageType) ||
                                  PageTable.IsStackPage(pageType) ||
                                  PageTable.IsSharedPage(pageType));
                    return;
                }
                UIntPtr objectAddr = InteriorPtrTable.Find(addr);

                registerThreadReferenceVisitor.threadPtrQueue.Write(objectAddr);
                registerThreadReferenceVisitor.threadPtrQueue.Write(addr - objectAddr);
                *Allocator.GetObjectVTableAddress(objectAddr) |= (UIntPtr)2U;
            }