Re: CfV: Quotations

From	anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups	comp.lang.forth
Subject	Re: CfV: Quotations
Date	2016-09-03 06:47 +0000
Organization	Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID	<2016Sep3.084717@mips.complang.tuwien.ac.at> (permalink)
References	<2016Aug10.185227@mips.complang.tuwien.ac.at> <nq6opg$h3j$1@dont-email.me> <2016Aug31.172633@mips.complang.tuwien.ac.at> <nqcr7j$kq7$1@dont-email.me>

Show all headers | View raw

Gerry Jackson <gerry@jackson9000.fsnet.co.uk> writes:
>On 31/08/2016 16:26, Anton Ertl wrote:
>> Actually the way it is specified does not make the xt explicit on the
>> stack, so that would not be a problem for your system.
>
>Yes I realised that, I just don't want an xt introduced in the stack 
>diagram of [:. Perhaps just add a few words to say the run-time xt given 
>by ;].

It is not in the stack diagram of "[:".  I'll present your concern if
somebody proposes adding it to the stack diagram of "[:" in the
committee (but I think that is unlikely).

>>> I don't see a good reason why the specification for :NONAME states that
>>> it leaves an xt on the data stack as that constrains an implementation -
>>> it would be better to leave a noname-sys on the control stack. It is not
>>> easy for a user to access the xt during compilation so why not leave it
>>> open for system implementers. I realise it would slightly complicate the
>>> specification of ; because that would have to be changed to leave an xt
>>> at the end of a :NONAME definition.
>>
>> So here you have the answer.
>
>It's not very difficult to change ; to only leave an xt if terminating a 
>:NONAME definition with an optional intervening DOES>

It may not be difficult to change in your private copy, but changing
it in the standard is a bit more involved.  It starts with a proposal,
and nobody has written one yet.  Also, in cases like this where a
feature that programs might rely on would be de-standardized, it takes
one standard period where the feature is still in the standard, but
obsolescent.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2016: http://www.euroforth.org/ef16/

Back to comp.lang.forth | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Re: CfV: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2016-08-31 15:15 +0100
  Re: CfV: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-08-31 15:26 +0000
    Re: CfV: Quotations Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2016-09-02 22:33 +0100
      Re: CfV: Quotations anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-09-03 06:47 +0000

csiph-web