From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Lars Brinkhoff Newsgroups: gmane.emacs.devel Subject: Re: User-reserved element in byte code vectors Date: 02 May 2004 09:59:24 +0200 Organization: nocrew Sender: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Message-ID: <85vfjf9s4j.fsf@junk.nocrew.org> References: <85k7036eqr.fsf@junk.nocrew.org> <85smepfzqo.fsf@junk.nocrew.org> <85ad0wfkms.fsf_-_@junk.nocrew.org> <85oepcdts4.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 1083484888 25470 80.91.224.253 (2 May 2004 08:01:28 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sun, 2 May 2004 08:01:28 +0000 (UTC) Original-X-From: emacs-devel-bounces+emacs-devel=quimby.gnus.org@gnu.org Sun May 02 10:01:22 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 1BKBuc-0002ly-00 for ; Sun, 02 May 2004 10:01:22 +0200 Original-Received: from monty-python.gnu.org ([199.232.76.173]) by quimby.gnus.org with esmtp (Exim 3.35 #1 (Debian)) id 1BKBuc-0003qj-00 for ; Sun, 02 May 2004 10:01:22 +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 1BKBtw-0006t8-VG for emacs-devel@quimby.gnus.org; Sun, 02 May 2004 04:00:40 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.30) id 1BKBtJ-0006oH-8C for emacs-devel@gnu.org; Sun, 02 May 2004 04:00:01 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.30) id 1BKBsm-0006Ws-Og for emacs-devel@gnu.org; Sun, 02 May 2004 04:00:00 -0400 Original-Received: from [80.91.224.249] (helo=main.gmane.org) by monty-python.gnu.org with esmtp (Exim 4.30) id 1BKBsm-0006WD-53 for emacs-devel@gnu.org; Sun, 02 May 2004 03:59:28 -0400 Original-Received: from list by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 1BKBsk-0003N3-00 for ; Sun, 02 May 2004 09:59:27 +0200 Original-Received: from junk.nocrew.org ([213.242.147.30]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 02 May 2004 09:59:26 +0200 Original-Received: from lars by junk.nocrew.org with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 02 May 2004 09:59:26 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-To: emacs-devel@gnu.org Original-Lines: 36 Original-X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: junk.nocrew.org User-Agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 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:22520 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:22520 Stefan Monnier writes: > 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 > clostly, 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 creates, e.g.: (defun make-closure (template env) (let ((args (aref template 0)) (code (aref template 1)) (constants (aref template 2)) (stack-size (aref template 3)) (doc (aref template 4)) (interactive (aref template 5))) (setq constants (copy-sequence constants)) (setq (aref constants 0) env) (make-byte-code args code constants stack-size doc interactive))) Whereas if the environment is located directly in the function, you only have to create a new byte code object: (defun make-closure (template env) (let ((args (aref template 0)) (code (aref template 1)) (constants (aref template 2)) (stack-size (aref template 3)) (doc (aref template 4)) (interactive (aref template 5))) (make-byte-code args code constants stack-size doc interactive env))) -- Lars Brinkhoff, Services for Unix, Linux, GCC, HTTP Brinkhoff Consulting http://www.brinkhoff.se/