From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: Making Emacs Lisp easier to debug Date: Sat, 11 Nov 2023 12:10:33 +0000 Message-ID: References: <838r74ye77.fsf@gnu.org> <83fs1cwnnv.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="16380"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Nov 11 13:11:08 2023 Return-path: 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 ) id 1r1mpQ-00046e-AW for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Nov 2023 13:11:08 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1r1moy-0002Ed-VR; Sat, 11 Nov 2023 07:10:41 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r1mox-0002EN-Dr for emacs-devel@gnu.org; Sat, 11 Nov 2023 07:10:39 -0500 Original-Received: from mail.muc.de ([193.149.48.3]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1r1mov-0007ns-0f for emacs-devel@gnu.org; Sat, 11 Nov 2023 07:10:39 -0500 Original-Received: (qmail 63972 invoked by uid 3782); 11 Nov 2023 13:10:34 +0100 Original-Received: from acm.muc.de (p4fe151aa.dip0.t-ipconnect.de [79.225.81.170]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Sat, 11 Nov 2023 13:10:33 +0100 Original-Received: (qmail 5106 invoked by uid 1000); 11 Nov 2023 12:10:33 -0000 Content-Disposition: inline In-Reply-To: <83fs1cwnnv.fsf@gnu.org> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.3; envelope-from=acm@muc.de; helo=mail.muc.de 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=unavailable 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." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:312546 Archived-At: Hello, Eli. On Sat, Nov 11, 2023 at 13:10:44 +0200, Eli Zaretskii wrote: > > Date: Sat, 11 Nov 2023 11:04:01 +0000 > > Cc: emacs-devel@gnu.org > > From: Alan Mackenzie > > :-) I really meant has anybody looked into making redisplay reentrant. > Good luck with that! > (I also don't understand why you think this will help with font-lock, > nor even how it would work in general, should it be possible. With font lock, or any other Lisp hook called from redisplay, it should be possible, in a recursive-edit loop, to run edebug, displaying on a different frame. That different frame would be running in the inner redisplay while the outer redisplay would be suspended. > Re-entering redisplay in the middle of a redisplay cycle means that > the outer redisplay didn't finish preparing the glyph matrices, and > what do you want the inner redisplay to do in such a case? Work with the glyph matrices belonging to the inner redisplay whilst the outer one is suspended. > ) As I say, it is not clear whether or not this is possible or practicable. If it were, we could enhance edebug such that a function in a font lock pattern, or on, say, window-scroll-functions could be edebugged by doing nothing more than instrumenting it with C-u C-M-x. Thus Lisp called from redisplay would cease to be an awkward special case as far as debugging is concerned. -- Alan Mackenzie (Nuremberg, Germany).