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Re: Strange memoizing behavior
From: |
Marius Vollmer |
Subject: |
Re: Strange memoizing behavior |
Date: |
24 Jan 2002 21:58:05 +0100 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.1 |
Michael Livshin <address@hidden> writes:
> I think that wanting to be more dynamic than Common Lisp is a Silly
> Idea, overall, but as I said I probably don't see all the usefullness
> of this eval-free macro introspection, so I'll be very grateful if you
> ignore my snottiness and elaborate further.
We can have it both, fixing the bug and keeping the introspection
abilities.
We currently have a setup like this:
symbol -> variable -> value
During memoization, when an expression in the operator position of a
form evaluates to a value that is a macro transformer, that macro is
expanded.
What we need to do is to have something like this
-> variable -> value
symbol -|
-> macro-transformer
That is, when looking up a symbol, we might find a variable OR a macro
transformer. You would not be able to bind a symbol to a
macro-transformer with 'define', we would need a new form, for example
'define-syntax'.
For global bindings, this is straightforward to implement, since
global bindings use 'variable objects' that have their own type and
can be readily identified. For local environments, something similar
can likely be arranged.
Of course, this all needs to be properly integrated with syntax-case.
[ I also think that SCM has recently solved the original problem with
some smallish, elegant change, but I can't remember what it was... ]
- Strange memoizing behavior, Matthias Koeppe, 2002/01/17
- Re: Strange memoizing behavior, Thien-Thi Nguyen, 2002/01/21
- Re: Strange memoizing behavior, Matthias Koeppe, 2002/01/22
- Re: Strange memoizing behavior, Michael Livshin, 2002/01/22
- Re: Strange memoizing behavior, Rob Browning, 2002/01/24
- Re: Strange memoizing behavior, Matthias Koeppe, 2002/01/24
- Re: Strange memoizing behavior, Michael Livshin, 2002/01/24
- Re: Strange memoizing behavior, Matthias Koeppe, 2002/01/24
- Re: Strange memoizing behavior, Michael Livshin, 2002/01/24
- Re: Strange memoizing behavior,
Marius Vollmer <=
- Re: Strange memoizing behavior, Thien-Thi Nguyen, 2002/01/25