From: Andy Wingo <wingo@pobox.com>
To: Michael Lucy <MichaelGLucy@Gmail.com>
Cc: guile-devel@gnu.org, No Itisnt <theseaisinhere@gmail.com>
Subject: Re: expression
Date: Thu, 24 Jun 2010 15:01:44 +0200 [thread overview]
Message-ID: <m3pqzg7fev.fsf@pobox.com> (raw)
In-Reply-To: <AANLkTimZDg1mZyS8wj7nVw6uGSaAP1p-zHzzeKOAolsU@mail.gmail.com> (Michael Lucy's message of "Wed, 23 Jun 2010 18:23:45 -0500")
Hi Michael,
On Thu 24 Jun 2010 01:23, Michael Lucy <MichaelGLucy@Gmail.com> writes:
> scheme@(guile-user)> ,c (begin (set! x 1) *unspecified*)
> Disassembly of #<objcode 9a05d08>:
>
> 0 (assert-nargs-ee/locals 0)
> 2 (make-int8:1) ;; 1
> 3 (load-symbol "x") ;; x
> 8 (link-now)
> 9 (variable-set)
> 10 (load-symbol "*unspecified*") ;; *unspecified*
> 27 (link-now)
> 28 (variable-ref)
> 29 (return)
In current Guile, *unspecified* is actually a macro, allowing the
compiler to do its job better:
scheme@(guile-user)> ,c (begin (set! x 1) *unspecified*)
<stdin>:1:10: warning: possibly unbound variable `x'
Disassembly of #<objcode 94a1908>:
0 (assert-nargs-ee/locals 0)
2 (make-int8:1) ;; 1
3 (load-symbol "x") ;; x
8 (link-now)
9 (variable-set)
10 (void)
11 (return)
Andy
--
http://wingolog.org/
next prev parent reply other threads:[~2010-06-24 13:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-23 21:09 expression Michael Lucy
2010-06-23 23:14 ` expression No Itisnt
2010-06-23 23:23 ` expression Michael Lucy
2010-06-24 13:01 ` Andy Wingo [this message]
2010-06-24 6:55 ` expression Ken Raeburn
2010-06-24 7:27 ` expression Thien-Thi Nguyen
2010-06-24 7:52 ` expression Michael Lucy
2010-06-24 13:05 ` expression Andy Wingo
2010-06-24 13:03 ` expression Andy Wingo
2010-06-24 14:40 ` expression Ken Raeburn
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