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From: Hongyi Zhao <hongyi.zhao@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: Too fine design granularity leads to numerous macro/function/command existed in Emacs.
Date: Sat, 14 Aug 2021 14:29:38 +0800	[thread overview]
Message-ID: <CAGP6PO+=Zn2x5upKoykUZKfzokBtjQJR0UyEofSiMh4BR4gNTA@mail.gmail.com> (raw)
In-Reply-To: <83o8a0blby.fsf@gnu.org>

On Sat, Aug 14, 2021 at 2:19 PM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > From: Hongyi Zhao <hongyi.zhao@gmail.com>
> > Date: Sat, 14 Aug 2021 08:46:27 +0800
> > Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> >
> > > Specifically about the one example you provided: directory-files is a
> > > primitive, written in C, so it provides the basic functionality of
> > > fetching file names from a single directory. The
> > > directory-files-recursively function is written in Lisp, it builds on
> > > that primitive and provides extended functionality.
> >
> > Thank you for letting me know this difference, which I really didn't
> > notice before. But there's still one question I don't understand:
> > C is a compiled language, so how does the compilation and invocation
> > of such C primitives work in Emacs? Are they compiled into libraries
> > and called in real time?
>
> The low-level infrastructure of the Lisp machine

IMO, by saying ``Lisp machine'', it always means the operating system
is written in lisp, but this is obviously not the case of Emacs.

> in Emacs is also written in C, and that includes the primitives used to call Lisp
> functions.  Those primitives have a special way of calling other
> primitives written in C.  Basically, a primitive written in C is
> wrapped in a special 'subr' object that tells Emacs about this, and
> then such primitives are called via the normal C mechanisms of calling
> functions.
>
> For more details, I suggest to study the node "Writing Emacs
> Primitives" in the ELisp manual.

Thank you very much for your valuable comments.

Hongyi



  reply	other threads:[~2021-08-14  6:29 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-13  7:12 Too fine design granularity leads to numerous macro/function/command existed in Emacs Hongyi Zhao
2021-08-13  7:25 ` Eli Zaretskii
2021-08-14  0:46   ` Hongyi Zhao
2021-08-14  6:18     ` Eli Zaretskii
2021-08-14  6:29       ` Hongyi Zhao [this message]
2021-08-14  7:18         ` Eli Zaretskii
2021-08-14  7:25           ` Hongyi Zhao
2021-08-14  7:47             ` Eli Zaretskii
2021-08-13  7:57 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13  8:34   ` Hongyi Zhao
2021-08-13  8:56     ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13  9:20       ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13  9:26 ` Arthur Miller
2021-08-13 10:11   ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 13:00     ` [OFF TOPIC] Algorithms (was: Re: Too fine design granularity leads to numerous macro/function/command existed in Emacs.) 2QdxY4RzWzUUiLuE
2021-08-13 13:07       ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 13:17         ` Yuri Khan
2021-08-13 13:26           ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 13:48     ` Too fine design granularity leads to numerous macro/function/command existed in Emacs Arthur Miller
2021-08-13 18:21       ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 20:47         ` Arthur Miller
2021-08-13 23:42           ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-14  0:24             ` Hongyi Zhao
2021-08-14  0:42               ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-14  1:02                 ` Hongyi Zhao
2021-08-14  2:18                   ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-14  1:46             ` Arthur Miller
2021-08-13 23:49         ` Hongyi Zhao
2021-08-13 23:54           ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 14:15   ` Eli Zaretskii
2021-08-13 14:42     ` Arthur Miller
2021-08-13 15:59       ` Eli Zaretskii
2021-08-13 17:09         ` Arthur Miller
2021-08-13 18:16       ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 23:40       ` Hongyi Zhao
2021-08-13 23:45         ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 23:57           ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-13 23:47         ` Emanuel Berg via Users list for the GNU Emacs text editor

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