From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Andrea Corallo <akrl@sdf.org>
Newsgroups: gmane.emacs.devel
Subject: Re: How does one find out what file a library has been loaded from?
Date: Tue, 19 Jul 2022 15:32:40 +0000
Message-ID: <xjfv8rtnmnb.fsf@ma.sdf.org>
References: <YtaM2N5sIH1YXvPx@ACM> <83bktlnuog.fsf@gnu.org>
 <YtbHOGta+SWoXeaf@ACM>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="4515"; mail-complaints-to="usenet@ciao.gmane.io"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)
Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
To: Alan Mackenzie <acm@muc.de>
Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Jul 19 17:39:32 2022
Return-path: <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Envelope-to: ged-emacs-devel@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1oDpJs-0000wL-S4
	for ged-emacs-devel@m.gmane-mx.org; Tue, 19 Jul 2022 17:39:32 +0200
Original-Received: from localhost ([::1]:60210 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>)
	id 1oDpJq-0004fw-CI
	for ged-emacs-devel@m.gmane-mx.org; Tue, 19 Jul 2022 11:39:30 -0400
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:46658)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <akrl@sdf.org>) id 1oDpGk-0000kQ-Kv
 for emacs-devel@gnu.org; Tue, 19 Jul 2022 11:36:18 -0400
Original-Received: from mx.sdf.org ([205.166.94.24]:59358)
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <akrl@sdf.org>)
 id 1oDpGY-0003k0-UI; Tue, 19 Jul 2022 11:36:18 -0400
Original-Received: from ma.sdf.org (ma.sdf.org [205.166.94.33])
 by mx.sdf.org (8.15.2/8.14.5) with ESMTPS id 26JFWe8f021216
 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits) verified NO);
 Tue, 19 Jul 2022 15:32:40 GMT
In-Reply-To: <YtbHOGta+SWoXeaf@ACM> (Alan Mackenzie's message of "Tue, 19 Jul
 2022 15:01:12 +0000")
Received-SPF: pass client-ip=205.166.94.24; envelope-from=akrl@sdf.org;
 helo=mx.sdf.org
X-Spam_score_int: -18
X-Spam_score: -1.9
X-Spam_bar: -
X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001,
 SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-BeenThere: emacs-devel@gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Emacs development discussions." <emacs-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/emacs-devel>
List-Post: <mailto:emacs-devel@gnu.org>
List-Help: <mailto:emacs-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/emacs-devel>,
 <mailto:emacs-devel-request@gnu.org?subject=subscribe>
Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org
Original-Sender: "Emacs-devel"
 <emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.devel:292276
Archived-At: <http://permalink.gmane.org/gmane.emacs.devel/292276>

Alan Mackenzie <acm@muc.de> writes:

> Hello, Eli.
>
> On Tue, Jul 19, 2022 at 15:39:11 +0300, Eli Zaretskii wrote:
>> > Date: Tue, 19 Jul 2022 10:52:08 +0000
>> > From: Alan Mackenzie <acm@muc.de>
>
>> > Hello, Emacs.
>
>> > Forgive me if I've asked this before, but how does one determine what
>> > file a library has been loaded from?  In particular, whether that file
>> > is a source file, a byte compiled file or a native compiled file.
>
>> > I've tried looking at load-history, and it tells me cc-engine was loaded
>> > from 
>
>> >   "/home/acm/emacs/emacs.git/sub-master-5/lisp/progmodes/cc-engine.elc"
>
>> > ..  I think that's a lie.  I suspect I'm dealing with a native compiled
>> > cc-engine, here.  In fact, the string ".eln" doesn't occur anywhere in
>> > load-history, and I _know_ some of the files are native compiled - my
>> > build was configured with-native-compilation.
>
>> > So, how do I find this out?
>
>> What do you like to find? whether it was loaded from cc-engine.elc or
>> cc-engine-XXXXXX.eln?
>
> Exactly that, yes.
>
>> If so, why does it matter?
>
> It matters a great deal.  There's the purely philosophical point that one
> should be able to control and understand ones own Emacs.  A further point
> is that Emacs should not deceive its users.
>
> There's the point that if you're doing benchmark timings, the results are
> meaningless if you don't know what you're timing.
>
> The reason I asked was I was seeing a bug in what I suspected to be a
> ..eln, but didn't see it in .elc's, and thus suspected a native compiler
> bug.  I've seen other things since, and don't suspect that any more.
>
> But I'd still like to be able to know what file I'm executing.

We coudln't change the `load-history' content as unfortunatelly it was
breaking many packages (tested).

If you have a native compiled function (say `find-file') to get the eln
file containing it one can use.

(native-comp-unit-file (subr-native-comp-unit (symbol-function #'find-file)))

Hope it helps

  Andrea