From: pjb@informatimago.com (Pascal J. Bourguignon)
To: help-gnu-emacs@gnu.org
Subject: Re: Problem advising nreverse.
Date: Mon, 14 Dec 2009 14:01:48 +0100 [thread overview]
Message-ID: <87bpi1n1z7.fsf@galatea.local> (raw)
In-Reply-To: mailman.12932.1260788943.2239.help-gnu-emacs@gnu.org
Sergei Organov <osv@javad.com> writes:
> pjb@informatimago.com (Pascal J. Bourguignon) writes:
>> Sergei Organov <osv@javad.com> writes:
>>
>>> Hello,
>>>
>>> It seems that an advice set for `nreverse' function fails to be called
>>> when `nreverse' is called from a byte compiled function:
>
> [...]
>
>>> Is it bug or feature? What's going on here?
>>
>> Indeed, it is a feature.
>>
>> Advices are not available from several call points:
>>
>> 1- when the advised function is called from C code.
>>
>> 2- when the advised function is a an opcode of the virtual machine.
>> You can observe the difference between the two primitives nreverse
>> and buffer-name for example, with:
>>
>> (disassemble (byte-compile (lambda (x) (nreverse x))))
>> vs.:
>> (disassemble (byte-compile (lambda (x) (buffer-name x))))
>>
>> In the former case, nreverse is a byte code, and therefore no
>> advice applies. In the later case, buffer-name is called with the
>> call byte code, which will go thru the advice.
>>
>> Notice that if you really want to advice such a low level primitive
>> function as nreverse, you can replace it with a lisp function (and
>> recompile all the code that uses it).
>
> Thanks a lot for the explanations and suggestion.
>
> Unfortunately this is not an option as intention was to advise
> `nreverse' during calls to a possibly buggy `ewoc-collect' function that
> for a long time errorneously called `nreverse' at the end (fixed since
> 2008).
Redefining nreverse and reloading the ewoc-collect function would help
as indicated...
--
__Pascal Bourguignon__
next prev parent reply other threads:[~2009-12-14 13:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.12764.1260538816.2239.help-gnu-emacs@gnu.org>
2009-12-12 12:18 ` Problem advising nreverse Pascal J. Bourguignon
2009-12-14 11:07 ` Sergei Organov
[not found] ` <mailman.12932.1260788943.2239.help-gnu-emacs@gnu.org>
2009-12-14 13:01 ` Pascal J. Bourguignon [this message]
2009-12-14 15:05 ` Sergei Organov
2009-12-15 8:19 ` Kevin Rodgers
2009-12-15 12:02 ` Sergei Organov
[not found] ` <mailman.12940.1260803316.2239.help-gnu-emacs@gnu.org>
2009-12-14 15:23 ` Pascal J. Bourguignon
2009-12-14 16:01 ` Sergei Organov
[not found] ` <mailman.12941.1260806509.2239.help-gnu-emacs@gnu.org>
2009-12-14 17:56 ` Pascal J. Bourguignon
2009-12-14 19:59 ` Sergei Organov
[not found] ` <mailman.12952.1260820780.2239.help-gnu-emacs@gnu.org>
2009-12-15 1:47 ` Pascal J. Bourguignon
2009-12-15 12:06 ` Sergei Organov
[not found] ` <mailman.13009.1260879016.2239.help-gnu-emacs@gnu.org>
2009-12-15 19:54 ` Pascal J. Bourguignon
2009-12-15 20:38 ` Sergei Organov
[not found] ` <mailman.13027.1260909564.2239.help-gnu-emacs@gnu.org>
2009-12-15 21:12 ` Barry Margolin
2009-12-16 11:27 ` Sergei Organov
[not found] ` <mailman.13051.1260962896.2239.help-gnu-emacs@gnu.org>
2009-12-17 16:52 ` Barry Margolin
2009-12-11 13:22 Sergei Organov
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