From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: =?UTF-8?Q?Aur=C3=A9lien_Aptel?= Newsgroups: gmane.emacs.help Subject: Re: What does "tag space" mean? Date: Fri, 1 Mar 2013 14:21:45 +0100 Message-ID: References: <20130301203952.bd28e3ed22f0d37bff19518f@gmail.com> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1362144118 18606 80.91.229.3 (1 Mar 2013 13:21:58 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 1 Mar 2013 13:21:58 +0000 (UTC) Cc: help-gnu-emacs@gnu.org To: Xue Fuqiao Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Mar 01 14:22:19 2013 Return-path: Envelope-to: geh-help-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 1UBPul-0006Xs-Ny for geh-help-gnu-emacs@m.gmane.org; Fri, 01 Mar 2013 14:22:19 +0100 Original-Received: from localhost ([::1]:47753 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UBPuQ-0005NO-Ks for geh-help-gnu-emacs@m.gmane.org; Fri, 01 Mar 2013 08:21:58 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:36528) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UBPuF-0005NI-Vt for help-gnu-emacs@gnu.org; Fri, 01 Mar 2013 08:21:48 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UBPuE-0002pz-S9 for help-gnu-emacs@gnu.org; Fri, 01 Mar 2013 08:21:47 -0500 Original-Received: from mail-vc0-f175.google.com ([209.85.220.175]:35766) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UBPuE-0002po-Ni for help-gnu-emacs@gnu.org; Fri, 01 Mar 2013 08:21:46 -0500 Original-Received: by mail-vc0-f175.google.com with SMTP id p1so1358053vcq.6 for ; Fri, 01 Mar 2013 05:21:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=sZziSHw82rtLTVfM8c7U5ZqVLPlWMEYmOqO8vcGudtU=; b=pflOo9LEkgDJB7Ldx8tny+E3JsAxUfjJRwCp0Lk+brlq57/PmkaEiYiF+TrmQQSvTV L+aZOWfgfkzeQ5i7TbCsq+6bOwXieLwX0BPnojMBO92+c0JoSFWms2FOh5U/iJkrPv1I NKFlff9qrwzL+WBFDDsgmIgWzxWdu1rXGDnBlCsZwwHhfo9dnjflZ6Lb/B1zo254eyXk EFNZnIwarFV4fWqWQLYQRvS7eEIMSUd4kVECZDBuUybm0wdfeZgzkmGGeLf5lgqWwkNg 3J3XGNt+n5Ma6XOvqxtEG87R9hVVm3htpq4xCzFid84jMUKdTKQfMSYs6Gl8qT+1P2ZP eq3A== X-Received: by 10.52.22.74 with SMTP id b10mr3526529vdf.96.1362144105969; Fri, 01 Mar 2013 05:21:45 -0800 (PST) Original-Received: by 10.58.161.145 with HTTP; Fri, 1 Mar 2013 05:21:45 -0800 (PST) In-Reply-To: <20130301203952.bd28e3ed22f0d37bff19518f@gmail.com> X-Google-Sender-Auth: shwpfbvfvf8pCNfDxqEJxmG4mxI X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 209.85.220.175 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:89308 Archived-At: On Fri, Mar 1, 2013 at 1:39 PM, Xue Fuqiao wrote: > What does "tag space" mean here? I had searched the manual and web, but I > didn't find anything useful. Can anybody help? Thanks. Lisp_Objet use 3 bits to store types ie. to "tag" a pointer. Thus, tag space can hold 2^3 values. I've started to write a small guide to the C code on emacswiki [1]. Any contribution welcome :) http://www.emacswiki.org/emacs/HackerGuide