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: Help sought: Details of byte-compile-make-closure, please. Date: Tue, 17 May 2022 09:15:37 +0000 Message-ID: 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="1410"; mail-complaints-to="usenet@ciao.gmane.io" To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue May 17 11:18:37 2022 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 1nqtLh-0000Gg-DV for ged-emacs-devel@m.gmane-mx.org; Tue, 17 May 2022 11:18:37 +0200 Original-Received: from localhost ([::1]:45778 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nqtLf-0004Y2-Tm for ged-emacs-devel@m.gmane-mx.org; Tue, 17 May 2022 05:18:35 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35180) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nqtIw-0003Nk-2i for emacs-devel@gnu.org; Tue, 17 May 2022 05:15:47 -0400 Original-Received: from colin.muc.de ([193.149.48.1]:57473 helo=mail.muc.de) by eggs.gnu.org with smtp (Exim 4.90_1) (envelope-from ) id 1nqtIt-0001t1-Le for emacs-devel@gnu.org; Tue, 17 May 2022 05:15:45 -0400 Original-Received: (qmail 11600 invoked by uid 3782); 17 May 2022 09:15:38 -0000 Original-Received: from acm.muc.de (p4fe1589c.dip0.t-ipconnect.de [79.225.88.156]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Tue, 17 May 2022 11:15:38 +0200 Original-Received: (qmail 3846 invoked by uid 1000); 17 May 2022 09:15:37 -0000 Content-Disposition: inline X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.1; 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_NONE=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." 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" Xref: news.gmane.io gmane.emacs.devel:289836 Archived-At: Hello, Emacs. Whilst fixing bug #55323, I came across more places in the byte compiler where we might need to strip positions from symbols. In particular, in byte-compile-make-closure (in bytecomp.el), there are two calls to make-byte-code. These calls have (amongst other things) an ARG argument and an &optional INTERACTIVE-SPEC argument. The comments around this part of the code are rather sparse, and I can't find any documentation for internal-make-closure. My questions: (i) Does byte-compile-make-closure get called at all when lexical-binding is nil? (ii) Is the ARG argument to make-byte-code, extracted from the parameter FORM always in the bit-encoded form (7 bits for minimum args, 7 bits for maximum args and 1 bit for &rest), or might it sometimes be an "old fashioned" list of symbols? I need to know this because such a list might need positions stripping from these symbols. (iii) Is there ever a non-null interactive form contained in the parameter FORM? (If so, it comes in in a &rest parameter and is forwarded to make-byte-code in an &optional argument.) Such an interactive form may need positions stripping from its symbols too. Thanks in advance for the help! -- Alan Mackenzie (Nuremberg, Germany).