From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: [Emacs-diffs] emacs-25 3eb93c0: Rely on conservative stack scanning to find "emacs_value"s Date: Tue, 29 Mar 2016 08:59:47 -0400 Message-ID: References: <20151130193446.22218.14685@vcs.savannah.gnu.org> <56892947.80308@dancol.org> <56894233.8010106@cs.ucla.edu> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1459256426 17369 80.91.229.3 (29 Mar 2016 13:00:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 29 Mar 2016 13:00:26 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Mar 29 15:00:18 2016 Return-path: Envelope-to: ged-emacs-devel@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 1aktFp-00089E-3v for ged-emacs-devel@m.gmane.org; Tue, 29 Mar 2016 15:00:17 +0200 Original-Received: from localhost ([::1]:46648 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aktFo-00082l-G0 for ged-emacs-devel@m.gmane.org; Tue, 29 Mar 2016 09:00:16 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48316) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aktFf-0007zL-P9 for emacs-devel@gnu.org; Tue, 29 Mar 2016 09:00:13 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aktFc-0006vf-Jw for emacs-devel@gnu.org; Tue, 29 Mar 2016 09:00:07 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:50472) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aktFc-0006vT-Ef for emacs-devel@gnu.org; Tue, 29 Mar 2016 09:00:04 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1aktFb-000857-7u for emacs-devel@gnu.org; Tue, 29 Mar 2016 15:00:03 +0200 Original-Received: from 23-91-145-163.cpe.pppoe.ca ([23.91.145.163]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 29 Mar 2016 15:00:03 +0200 Original-Received: from monnier by 23-91-145-163.cpe.pppoe.ca with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 29 Mar 2016 15:00:03 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 15 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 23-91-145-163.cpe.pppoe.ca User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) Cancel-Lock: sha1:raREGATag2eR3pi1PA6HWYdASjM= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:202383 Archived-At: > - From a user's perspective, it removes NULL as a sentinel value to signal > an error. In Lisp_Object (and hence in emacs_value) you can have as many sentinel values as you want already (we typically use Qnil or uninterned symbols for that). > - From a developer perspective, it adds low-level complexity, > bit-twiddling, and possibly undefined behavior to a module that should only > contain glue code between two interfaces. I agree, so long as "it" refers to "wide-int". Stefan