Parser combinator library in C(github.com)

  - a 'recovery' list of (object pointer, old refcount) pairs
  - whenever you allocate something, add (object pointer, 0) to the list
  - when you update a reference count, check whether the object is in the list.
    If it is not, add it to the list, thus remembering the original refcount
  - whenever the code decreases reference count to zero, add the object to a
   'to be deleted' list (this could possibly be a linked list chained through
    the 'refcount' fields; the old refcount will be in the recovery list)
  - when the parser reaches toplevel without longjmp, clear the first list,
    and delete any objects in the 'to be deleted' list.
  - when a longjmp occurs, walk the list and reset reference counts. For
    zero 'old refcounts', delete the object

    parseAddress = 
       let hexStr2Int = Prelude.read . ("0x" ++)
           in do start <- many1 hexDigit
                 char '-'
                 end <- many1 hexDigit
                 return $ Address (hexStr2Int start) (hexStr2Int end)

    parseAddress = Address <$> hexDigits <*> (dash *> hexDigits)
       where
          hexDigits = string "0x" *> takeWhile1 hexadecimal
          dash      = char '-'