From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: How to add pseudo vector types Date: Wed, 14 Jul 2021 20:44:21 +0300 Message-ID: <83r1g07pu2.fsf@gnu.org> References: <84B70E9B-E1E5-40D3-AFBE-033CACF15914@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33810"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Yuan Fu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jul 14 19:49:34 2021 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 1m3j0n-0008cw-NS for ged-emacs-devel@m.gmane-mx.org; Wed, 14 Jul 2021 19:49:33 +0200 Original-Received: from localhost ([::1]:37042 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m3j0m-0005EU-NH for ged-emacs-devel@m.gmane-mx.org; Wed, 14 Jul 2021 13:49:32 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56642) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3ivp-00049r-Cy for emacs-devel@gnu.org; Wed, 14 Jul 2021 13:44:25 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:48836) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m3ivp-0002Fn-4x; Wed, 14 Jul 2021 13:44:25 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4322 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3ivo-0002dx-81; Wed, 14 Jul 2021 13:44:25 -0400 In-Reply-To: <84B70E9B-E1E5-40D3-AFBE-033CACF15914@gmail.com> (message from Yuan Fu on Wed, 14 Jul 2021 13:37:47 -0400) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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:271222 Archived-At: > From: Yuan Fu > Date: Wed, 14 Jul 2021 13:37:47 -0400 > > Say I want to expose tree-sitter’s parser to lisp, and I define it as a new pseudo vector. > > struct Lisp_TS_Parser > { > union vectorlike_header header; > Lisp_Object buffer; > TSParser *parser; > TSTree *tree; > TSInput input; > }; Inside Emacs, or in a module? I assume the former. > Now if I want to return a Lisp_Object, do I initialize this struct and cast it into a Lisp_Object and return it? Like: > > Lisp_TS_parser lisp_parser; > ... > return (Lisp_Object)lisp_parser; No, you need to define a proper Lisp_Object, and then define functions/macros to make a Lisp_Object that represents the struct, and vice versa. > And how do I use a USER_PTR? Do I cast it into (struct Lisp_User_Ptr) and use it normally, or is there some helper function that I should use? Look in lisp.h, you will find some infrastructure there. > Are there examples of using pseudo vectors? Every buffer, window, frame, and overlay is a pseudo vector. Look how these are handled in lisp.h and in the rest of the code, and you will find a lot of examples.