From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: scratch/accurate-warning-pos: Solid progress: the branch now bootstraps. Date: Mon, 26 Nov 2018 09:43:46 -0800 Organization: UCLA Computer Science Department Message-ID: <9e216e61-7d95-94f0-cbee-593b4f32ced2@cs.ucla.edu> References: <20181117124534.GA8831@ACM> <83muq7u9rk.fsf@gnu.org> <20181123130904.GA2916@ACM> <20181125193050.GH27152@ACM> <2c2ae483-3309-f79d-07a5-30af1f49058b@cs.ucla.edu> <20181125212920.GK27152@ACM> <60ac9dfc-b540-89f9-68ea-ec7cceaa8511@cs.ucla.edu> <83in0kijz0.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1543254204 31446 195.159.176.226 (26 Nov 2018 17:43:24 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 26 Nov 2018 17:43:24 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 Cc: michael_heerdegen@web.de, acm@muc.de, cpitclaudel@gmail.com, monnier@IRO.UMontreal.CA, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Nov 26 18:43:20 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gRKul-00081d-Gt for ged-emacs-devel@m.gmane.org; Mon, 26 Nov 2018 18:43:19 +0100 Original-Received: from localhost ([::1]:38039 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gRKwr-000133-Pb for ged-emacs-devel@m.gmane.org; Mon, 26 Nov 2018 12:45:29 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34508) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gRKvL-0008Sb-Qn for emacs-devel@gnu.org; Mon, 26 Nov 2018 12:43:56 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gRKvK-0006r0-6H for emacs-devel@gnu.org; Mon, 26 Nov 2018 12:43:55 -0500 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:36684) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gRKvG-0006os-4P; Mon, 26 Nov 2018 12:43:50 -0500 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 8F7D6160235; Mon, 26 Nov 2018 09:43:47 -0800 (PST) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 83P7T_W2Wnz2; Mon, 26 Nov 2018 09:43:46 -0800 (PST) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id CD8FA160276; Mon, 26 Nov 2018 09:43:46 -0800 (PST) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id nI3kZYUKafzT; Mon, 26 Nov 2018 09:43:46 -0800 (PST) Original-Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id AE177160235; Mon, 26 Nov 2018 09:43:46 -0800 (PST) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: <83in0kijz0.fsf@gnu.org> Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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" Xref: news.gmane.org gmane.emacs.devel:231403 Archived-At: On 11/25/18 7:41 PM, Eli Zaretskii wrote: >> we could have a separate interpreter used only by the byte compiler. > I don't think I like this idea: it will be a maintenance burden to > maintain two interpreters, and we will have subtle long-lived bugs. Yes, the only way it's plausible is if we have just one source-code instance of the interpreter, parameterized by whether it's doing things the slower (byte-compiler-oriented) way or the faster (current) way, and then partially evaluate the interpreter for the two cases. In that case the source code should be not much more complicated than scratch/accurate-warning-pos, and the number of subtle long-lived bugs should be about the same as scratch/accurate-warning-pos has now. As I said, this approach is not for the fainthearted. But it should fix the significant performance problems in scratch/accurate-warning-pos.