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From: ForthNet@willett.UUCP (ForthNet articles from GEnie)
Newsgroups: comp.lang.forth
Subject: Linking, Modules, and Overlays
Message-ID: <499.UUL1.3#5129@willett.UUCP>
Date: 18 Feb 90 23:41:57 GMT
Organization: Latest link in the ForthNet chain.  (Pgh, PA)
Lines: 42

Category 3,  Topic 11
Message 47        Sat Feb 17, 1990
R.BERKEY [Robert]            at 19:00 PST
 
   To: David Albert
   Re: Libraries (vocabularies)

 > Due to the interpretive nature of TILs, I seem to be having some
 > trouble implementing libraries.  I would like to allow several
 > libraries (vocabularies) which can be manipulated independently and
 > linked into my final application.  I have read some of the solutions
 > on late binding, but none I've seen have been satisfactory.  Does
 > anyone have any ideas, hints, etc.  Do you know how
 > anyone else does it?  Any advice would be appreciated.

As with TIL's, I'm not familiar with what the books have to say on late
binding.

You might take a look at token threading.  For more details, Terry Holmes has
reported in a 1983 or 1984 issue of the Journal of Forth Applications and
Research (JFAR) on variations, although his code examples are for the 68000. 
John Bumgarner, mentioned recently on ForthNet, could also provide some
information.

LIB-FORTH from Mountain View Press (MVP) in Mt. View, CA, has something along
the lines of modular vocabularies/libraries, allowing vocabularies such as the
assembler in alternate segments.  I'm recalling that the access to a word in
the vocabulary is done with 4 bytes, and the vocabulary/segment duplicates
essential code words.

The 1983(?) FORML proceedings has a paper by Glen Haydon on virtual
vocabularies.

Modular Forth, a commercial system from Microprocessor Engineering (MPE) in
Southampton, England, has some fairly advanced solutions.  They have a US
contact in Rochester, NY, and an interesting product brochure.

Robert

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