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: Re: Correct byte compiler error/warning positions. The solution! Date: Tue, 14 Dec 2021 14:29:31 +0000 Message-ID: References: <838rx4s224.fsf@gnu.org> <834k7ss172.fsf@gnu.org> 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="35933"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Eli Zaretskii , emacs-devel@gnu.org To: Andrea Corallo Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Dec 14 15:30:35 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 1mx8p9-0009A5-EC for ged-emacs-devel@m.gmane-mx.org; Tue, 14 Dec 2021 15:30:35 +0100 Original-Received: from localhost ([::1]:54830 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mx8p8-0001Mq-DM for ged-emacs-devel@m.gmane-mx.org; Tue, 14 Dec 2021 09:30:34 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:40278) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mx8oM-0000bh-6j for emacs-devel@gnu.org; Tue, 14 Dec 2021 09:29:46 -0500 Original-Received: from colin.muc.de ([193.149.48.1]:18865 helo=mail.muc.de) by eggs.gnu.org with smtp (Exim 4.90_1) (envelope-from ) id 1mx8oJ-000503-Ub for emacs-devel@gnu.org; Tue, 14 Dec 2021 09:29:45 -0500 Original-Received: (qmail 15757 invoked by uid 3782); 14 Dec 2021 14:29:32 -0000 Original-Received: from acm.muc.de (p4fe154e3.dip0.t-ipconnect.de [79.225.84.227]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Tue, 14 Dec 2021 15:29:31 +0100 Original-Received: (qmail 32410 invoked by uid 1000); 14 Dec 2021 14:29:31 -0000 Content-Disposition: inline In-Reply-To: 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 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:281904 Archived-At: Hello, Andrea. On Sat, Dec 04, 2021 at 19:22:02 +0000, Andrea Corallo wrote: > Alan Mackenzie writes: [ .... ] > Hi Alan, > > For extending emit_EQ, I've got the following embryonic scheme: > > 1/- Import the C variable symbols_with_pos_enabled: > > gcc_jit_lvalue *syms_with_pos_enabled = > > gcc_jit_context_new_global > > (comp.ctxt, NULL, > > GCC_JIT_GLOBAL_IMPORTED, > > gcc_jit_get_type (comp.ctxt, GCC_JIT_TYPE_BOOL), > > "symbols_with_pos_enabled"); > Yep something like. PS We already have 'comp.bool_type' to use. [ .... ] > > Can you let me know what you think of this approach, please? That is, > > before I put a lot of work into it. Is it broadly a good way of doing > > the job? > I think it could be a good idea but I believe there's no need to use > macros here, we could have just functions return rvalues no? Yes, no macros needed. :-) > I'm not a big fan of C macros and I try not to use them whem possible. [ .... ] I have a problem at the moment, which could be a big problem. How do I refer to a Lisp variable from jit generated code? In particular, I need read-access to symbols-with-pos-enabled, or more precisely to globals.f_symbols_with_pos_enabled. The gcc jit product seems to go out of its way to make such access as difficult as possible. There is a way to get an integer out of "C space" into the jit mechanism, but this cannot be cast to a pointer type, and there is no similar mechanism to get a pointer out of C space. In fact, gcc jit seems to restrict the language it supports to the equivalent of Pascal, and makes pointer arithmetic impossible. I tried declaring "globals" as a global variable to be imported into jit space, but the loader doesn't know about "globals". So, how can I get access to globals.f_symbols_with_pos_enabled? Thanks in advance! > Best Regards > Andrea -- Alan Mackenzie (Nuremberg, Germany).