From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: srfi-18 and the vm Date: Sun, 24 May 2009 00:03:17 +0200 Message-ID: <87r5yfxysa.fsf@gnu.org> References: <878wko16zz.fsf@arudy.ossau.uklinux.net> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1243116237 3477 80.91.229.12 (23 May 2009 22:03:57 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 23 May 2009 22:03:57 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Sun May 24 00:03:50 2009 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1M7zJi-0005AE-3B for guile-devel@m.gmane.org; Sun, 24 May 2009 00:03:46 +0200 Original-Received: from localhost ([127.0.0.1]:51500 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1M7zJh-0005zW-Ie for guile-devel@m.gmane.org; Sat, 23 May 2009 18:03:45 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1M7zJf-0005y5-N2 for guile-devel@gnu.org; Sat, 23 May 2009 18:03:43 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1M7zJa-0005tx-V1 for guile-devel@gnu.org; Sat, 23 May 2009 18:03:43 -0400 Original-Received: from [199.232.76.173] (port=60685 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1M7zJa-0005tu-Rc for guile-devel@gnu.org; Sat, 23 May 2009 18:03:38 -0400 Original-Received: from main.gmane.org ([80.91.229.2]:60723 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1M7zJa-00019W-9r for guile-devel@gnu.org; Sat, 23 May 2009 18:03:38 -0400 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1M7zJR-0005r6-VE for guile-devel@gnu.org; Sat, 23 May 2009 22:03:29 +0000 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 23 May 2009 22:03:29 +0000 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 23 May 2009 22:03:29 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 36 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 4 Prairial an 217 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.90 (gnu/linux) Cancel-Lock: sha1:rXNXtDus58Csvz2J4dSd+O6AO7w= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:8510 Archived-At: Hello! Andy Wingo writes: > On Sat 23 May 2009 11:52, Neil Jerram writes: > >> Andy Wingo writes: >> >>> With psyntax running a pre-analysis phase on all source code, we can do >>> away with lazy memoization entirely -- a neat hack, but it made eval.c >>> buggy and impenetrable. I'll write more about that in the future. >> >> Anticipating your "more in the future", do you mean that the >> pre-analysis does all the memoization in advance? > > It does not now, but it could. [...] > In compile mode, these procedures create tree-il objects. In eval mode, > they create s-expressions, so that the expander can work before modules > are booted. (The mode is the second parameter to sc-expand; it's eval > mode by default, but the compiler sets it to compile mode.) > > One should be able to memoize ilocs in from the result of the output, in > a second pass, given that there are so few forms. Of course some > memoization can happen lazily too, e.g. global lookup; [...] I'm slightly concerned that doing things ahead of time rather than just in time (i.e., lazily) would have a negative impact on the interpreter's start-up time, which may be noticeable for short-lived scripts. What do you think? Thanks, Ludo'.