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From: ForthNet@willett.pgh.pa.us (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Linking, Modules, and Overlays
Message-ID: <2452.UUL1.3#5129@willett.pgh.pa.us>
Date: 4 Mar 91 13:19:58 GMT
Organization: (n.) to be organized.  But that's not important right now.
Lines: 58


 Date: 02-27-91 (13:37)              Number: 1349 of 1349
   To: DENNIS RUFFER                 Refer#: 1316
 From: ELLIOTT CHAPIN                  Read: NO
 Subj: LINKING, MODULES, AND OVE     Status: PUBLIC MESSAGE
 Conf: FORTH (58)                 Read Type: GENERAL (+)

 Subj: LINKING, MODULES, AND OVE

 DR>Re: STANLEY SUTTON

  > Are the following two screens a proper use of defining words?

 DR>...code removed...

 DR>Not bad Stan.  The only concern I would have is what happens to the other
 DR>registers.  Forth typically keeps some things in registers like return 
 DR>stack and interpreter pointers. You may need to push and pop them in your
 DR>code routines.  I don't remember which ones F83 uses however, but look at
 DR>the low level words (like docolon) to figure it out.

 F83 data stack ptr = SP
     return           BP
     instruction      SI
     word             BX  - this one only important for recursion

 Dennis,

 I've gotten a little further on my token-threaded Forth since we
 spoke last week:  in fact, a "new class of CFAs" for relatives of
 CREATES/DOES> or IF/THEN, etc.is not needed (as far as I can tell).
 The token table can hold adjusted values of the instruction pointer,
 as well as current CFAs.  This takes care of preserving parent/child
 links easily as long as token-table order is kept the same as
 dictionary order.  There is an obvious catch:  dictionary searches
 by token-table alone won't work in general; all that means
 is that LFAs of some kind would still be needed.

 Regards,

 Elliott

 PS - It's not clear how dependable the CRS Usenet/e-mail
 connection is, so please let me know by mail or phone as well as
 e-mail if/when I get the chance to be one of the GEnie volunteers.

 Elliott Chapin
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