return resourceTable[Conversions.addressToPagesDown(addr)];
int which = Conversions.addressToPagesDown(addr);  if (which >= resourceTable.length)) return null;  return resourceTable[which];
  public static VMResource resourceForPage(VM_Address addr) {    if (resourceTable == null)      VM_Interface.sysFail("resourceForBlock called when resourceTable is null");    return resourceTable[Conversions.addressToPagesDown(addr)];  }