From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.bugs Subject: bug#22884: 25.0.92; C/l mode editing takes waaaayy too long Date: Thu, 3 Mar 2016 22:59:49 +0000 Message-ID: <20160303225949.GC3822@acm.fritz.box> References: <56D72C35.4090708@cs.ucla.edu> <20160303124910.GA2852@acm.fritz.box> <56D87A6E.8090202@cs.ucla.edu> <20160303192330.GA3822@acm.fritz.box> <56D8B337.7000302@cs.ucla.edu> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1457045903 1982 80.91.229.3 (3 Mar 2016 22:58:23 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 3 Mar 2016 22:58:23 +0000 (UTC) Cc: 22884@debbugs.gnu.org To: Paul Eggert Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Mar 03 23:58:12 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1abcCA-0000Aw-R2 for geb-bug-gnu-emacs@m.gmane.org; Thu, 03 Mar 2016 23:58:10 +0100 Original-Received: from localhost ([::1]:37775 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abcCA-00057k-Ev for geb-bug-gnu-emacs@m.gmane.org; Thu, 03 Mar 2016 17:58:10 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:42519) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abcC6-00056k-UU for bug-gnu-emacs@gnu.org; Thu, 03 Mar 2016 17:58:07 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1abcC5-0004ar-RO for bug-gnu-emacs@gnu.org; Thu, 03 Mar 2016 17:58:06 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:35220) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abcC2-0004aL-5V; Thu, 03 Mar 2016 17:58:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84) (envelope-from ) id 1abcC1-00053l-Tp; Thu, 03 Mar 2016 17:58:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Alan Mackenzie Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org, bug-cc-mode@gnu.org Resent-Date: Thu, 03 Mar 2016 22:58:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 22884 X-GNU-PR-Package: emacs,cc-mode X-GNU-PR-Keywords: Original-Received: via spool by 22884-submit@debbugs.gnu.org id=B22884.145704584019398 (code B ref 22884); Thu, 03 Mar 2016 22:58:01 +0000 Original-Received: (at 22884) by debbugs.gnu.org; 3 Mar 2016 22:57:20 +0000 Original-Received: from localhost ([127.0.0.1]:60580 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1abcBM-00052o-3E for submit@debbugs.gnu.org; Thu, 03 Mar 2016 17:57:20 -0500 Original-Received: from mail.muc.de ([193.149.48.3]:11349) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1abcBK-00052g-HF for 22884@debbugs.gnu.org; Thu, 03 Mar 2016 17:57:18 -0500 Original-Received: (qmail 32289 invoked by uid 3782); 3 Mar 2016 22:57:17 -0000 Original-Received: from acm.muc.de (p579E89EE.dip0.t-ipconnect.de [87.158.137.238]) by colin.muc.de (tmda-ofmipd) with ESMTP; Thu, 03 Mar 2016 23:57:16 +0100 Original-Received: (qmail 1245 invoked by uid 1000); 3 Mar 2016 22:59:49 -0000 Content-Disposition: inline In-Reply-To: <56D8B337.7000302@cs.ucla.edu> User-Agent: Mutt/1.5.24 (2015-08-30) X-Delivery-Agent: TMDA/1.1.12 (Macallan) X-Primary-Address: acm@muc.de X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:114368 Archived-At: Hello, Paul. On Thu, Mar 03, 2016 at 01:57:11PM -0800, Paul Eggert wrote: > On 03/03/2016 11:23 AM, Alan Mackenzie wrote: > > Why only for the one file? > Because I didn't have time to fix all the source files .... It could > easily be added, at least for files we maintain. Though, as Eli says, > it'd be nicer if cc-mode didn't think lines beginning with '(' were > relevant for function-start in C. This is an Emacs thing rather than a CC Mode one. It's all about how syntax.c goes backwards over a comment. You've just gone back over a comment ender, so you start searching for the comment starter, but when do you stop and give up? Currently the answer is at a paren in column zero (unless open-paren-in-column-0-is-defun-start is nil). It's a difficult problem. In previous versions of CC Mode, open-paren-..-start was bound to nil internally, "solving" the problem, but at an unacceptable cost in performance, particularly when editing later portions of a large file. > > The performance hit comes from the amount of contiguous syntactic > > whitespace following the "failed" comment. Have you checked this is > > the only file with so much SWS? > No. It's easier for me to simply fix all instances of code that have '(' > at line start. I can propose a more-complete patch along those lines. OK. > > OK. Could you give me a clue as to what they mean, please? For > > example, in > > INLINE EMACS_INT > > (XLI) (Lisp_Object o) > > { > > return lisp_h_XLI (o); > > } > > , what does "(XLI)" do? > It defines a function named 'XLI' even though there's also a > function-like macro named 'XLI', without expanding the macro. Ah, thank you! Now you've explained it, it's obvious. -- Alan Mackenzie (Nuremberg, Germany).