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From: Mark H Weaver <mhw@netris.org>
To: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
Cc: guile-devel <guile-devel@gnu.org>
Subject: Re: Special variables to relax boxing
Date: Thu, 21 Mar 2013 15:03:06 -0400	[thread overview]
Message-ID: <87d2usa845.fsf@tines.lan> (raw)
In-Reply-To: <CAGua6m1FzJYMXx3GnkEdiLJB=Y9JZs534MioLb6QZZBmRCj8=Q@mail.gmail.com> (Stefan Israelsson Tampe's message of "Thu, 21 Mar 2013 10:35:44 +0100")

Stefan, you're still describing your proposal in terms of low-level
implementation details such as stacks.  In the general case, we cannot
store environment structures on the stack.  Furthermore, in the general
case *all* variables in scheme are bound to locations, not values.  Only
in special cases can we use stacks, and only in special cases can we
avoid boxing variables.  These are only _optimizations_.

If you're serious about this proposal, please read sections 3.1 and 3.4
of the R5RS carefully.  Explain your proposed _semantics_ (not the
implementation details) in those terms, where *all* variables are bound
to _locations_, and where there is no stack at all (everything is
conceptually stored in a garbage-collected heap).

We need to understand the *semantics* in the simplest possible terms
before we even begin to think about how to implement it.

    Thanks,
      Mark



  parent reply	other threads:[~2013-03-21 19:03 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-19 22:05 Special variables to relax boxing Stefan Israelsson Tampe
2013-03-21  6:00 ` Mark H Weaver
2013-03-21  9:35   ` Stefan Israelsson Tampe
2013-03-21 15:35     ` Noah Lavine
2013-03-21 16:28       ` Stefan Israelsson Tampe
2013-03-21 19:03     ` Mark H Weaver [this message]
2013-03-21 20:15       ` Stefan Israelsson Tampe
2013-03-21 21:11         ` Noah Lavine
2013-03-22 22:33           ` Stefan Israelsson Tampe
2013-03-23  0:18             ` Daniel Hartwig
2013-03-23 15:34       ` Stefan Israelsson Tampe
2013-03-23 18:31         ` Stefan Israelsson Tampe
  -- strict thread matches above, loose matches on Subject: below --
2013-03-23 10:30 Stefan Israelsson Tampe

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