> No 'C' compiler should allow gotos from one function to another. I'd love
to
> here the story of any which does.

I don't see how that's possible in C since all functions are separate.

Pascal, however, has the notion of subordinate routines that only exist
within the scope of a single parent routine.  I know of at least one Pascal
compiler that allows GOTOs back to a parent routine.  I was always a bit
weary of it, and wondered if the compiler would properly unwind the stack if
the subordinate routine had called itself recursively, exactly what the
state of returned arguments were, etc.  I wrote a translator from Pascal to
C once, and finally decided to make such GOTOs illegal.  (Imagine trying to
implement such a feature using only standard C without benefit of stack
diddling.)  I kept nested routines because I felt this was a useful
construct although getting all the details right ended up taking quite a bit
of code.  If I remember right, it does multiple passes looking for
references to variables of any of the parent routines.  It keeps doing this
until nothing changes.  Rather a pain to implement but pretty cool once it
all worked.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@cognivis.com, http://www.cognivis.com

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu