From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: User-reserved element in byte code vectors Date: 02 May 2004 12:37:59 -0400 Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: References: <85k7036eqr.fsf@junk.nocrew.org> <85smepfzqo.fsf@junk.nocrew.org> <85ad0wfkms.fsf_-_@junk.nocrew.org> <85oepcdts4.fsf_-_@junk.nocrew.org> <85vfjf9s4j.fsf@junk.nocrew.org> NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1083515983 13594 80.91.224.253 (2 May 2004 16:39:43 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sun, 2 May 2004 16:39:43 +0000 (UTC) Cc: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Sun May 02 18:39:36 2004 Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1BKK08-0002yS-00 for ; Sun, 02 May 2004 18:39:36 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.35 #1 (Debian)) id 1BKK07-0004Ko-00 for ; Sun, 02 May 2004 18:39:35 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.30) id 1BKJzG-00014K-TH for emacs-devel@quimby.gnus.org; Sun, 02 May 2004 12:38:42 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.30) id 1BKJz7-00012L-F6 for emacs-devel@gnu.org; Sun, 02 May 2004 12:38:33 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.30) id 1BKJyb-0000kU-Gc for emacs-devel@gnu.org; Sun, 02 May 2004 12:38:32 -0400 Original-Received: from [206.47.199.141] (helo=simmts12-srv.bellnexxia.net) by monty-python.gnu.org with esmtp (Exim 4.30) id 1BKJyb-0000jf-0T for emacs-devel@gnu.org; Sun, 02 May 2004 12:38:01 -0400 Original-Received: from empanada.local ([67.71.116.192]) by simmts12-srv.bellnexxia.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040502163800.NSBG25455.simmts12-srv.bellnexxia.net@empanada.local>; Sun, 2 May 2004 12:38:00 -0400 Original-Received: by empanada.local (Postfix, from userid 502) id 585E3171671; Sun, 2 May 2004 12:38:00 -0400 (EDT) Original-To: Lars Brinkhoff In-Reply-To: <85vfjf9s4j.fsf@junk.nocrew.org> Original-Lines: 20 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.4 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Xref: main.gmane.org gmane.emacs.devel:22538 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:22538 >> I'd argue that the closure's enviornment should be put as the first >> element in the constants-vector rather than in a separate slot in >> the byte code object: it makes closure construction slower and more >> costly, but it makes the function call faster. > The downside to that is that you would have to create both a new byte > code object, and a new constants vector every time a closure is > created. Yes, as I said above, "it makes closure construction slower and more costly". But it does make calling a closure faster since closures are then plain old normal byte-code objects supported natively whereas in your case you need to do some massaging before doing the actual `funcall'. Furthermore, with your scheme you can't call closures in the same way as built-in functions. How do you deal with that without slowing down function calls or closure construction too much? Stefan