From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#65726: 29.1.50; Crash in regexp engine Date: Sun, 17 Sep 2023 23:59:32 -0400 Message-ID: References: <8e1b4e50-0430-3eb3-e486-60def1e4821f@gmx.at> <83fs3u5e7u.fsf@gnu.org> <835y4q5apw.fsf@gnu.org> <776370AB-662F-4C0A-95BF-97DEA4F18F54@gmail.com> <3A0AC9E2-A420-47B6-870A-69C53FCAEF71@gmail.com> <65105BCA-1884-4673-A8F8-03E3C7ABAAEA@gmail.com> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30589"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: martin rudalics , Eli Zaretskii , 65726@debbugs.gnu.org To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Sep 18 06:00:13 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1qi5Qi-0007jT-Fp for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 18 Sep 2023 06:00:12 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qi5QS-0008JF-Uu; Sun, 17 Sep 2023 23:59:56 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qi5QR-0008J0-Mi for bug-gnu-emacs@gnu.org; Sun, 17 Sep 2023 23:59:55 -0400 Original-Received: from debbugs.gnu.org ([2001:470:142:5::43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qi5QR-0000Ak-EW for bug-gnu-emacs@gnu.org; Sun, 17 Sep 2023 23:59:55 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1qi5QZ-000825-1e for bug-gnu-emacs@gnu.org; Mon, 18 Sep 2023 00:00:03 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 18 Sep 2023 04:00:03 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 65726 X-GNU-PR-Package: emacs Original-Received: via spool by 65726-submit@debbugs.gnu.org id=B65726.169500959430797 (code B ref 65726); Mon, 18 Sep 2023 04:00:03 +0000 Original-Received: (at 65726) by debbugs.gnu.org; 18 Sep 2023 03:59:54 +0000 Original-Received: from localhost ([127.0.0.1]:51760 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1qi5QQ-00080e-Gd for submit@debbugs.gnu.org; Sun, 17 Sep 2023 23:59:54 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:32571) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1qi5QO-00080N-81 for 65726@debbugs.gnu.org; Sun, 17 Sep 2023 23:59:53 -0400 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 9F856806AC; Sun, 17 Sep 2023 23:59:38 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1695009573; bh=T2iGOu1J+gGY0aCs0zHs2Ao6zitDJTKDdlla14CTGC4=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=FFIFpgJzoEFVQc9vHpWRtgElrYHI2Twii+5S1fiRRnzVzsAo4jPs3Z1wXxpIaenv8 xg7+J0ovlK205BaCnM1cvixdMhiKS3x3n2+lQWOl/1oV5MWgl/OGxblro60J31YUxV K4N8BsS43QBQxh5Mjeq4Gvk2OlJR049ynkHOMx42twUldFKvwyUx8Z3r5vBURnTwxs VgmEAMzzGBxe7der7Rtb2vWXFBxHykZF0tkcUspDGlqBUbqyvr5Z6WTepLY+gi1SFI fC6xA7lYFbC7EOtq1Its842WgG/cugNZwmJgEXcCwexFUhfz/Q+rx6cagA149VOU80 CSp65kmSJHcKw== Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 598BD803E6; Sun, 17 Sep 2023 23:59:33 -0400 (EDT) Original-Received: from pastel (unknown [45.72.220.249]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 281671203C3; Sun, 17 Sep 2023 23:59:33 -0400 (EDT) In-Reply-To: (Stefan Monnier's message of "Sun, 17 Sep 2023 22:14:37 -0400") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:270737 Archived-At: > So maybe we should `skip_noops` before looking at the destinations to > decide if it's a loop? Nah, just introduces other problems :-( BTW maybe we should replace 31: /on_failure_jump_loop to 37 34: /jump to 9 with 31: /on_failure_dont_jump_loop to 9 It's quite funny actually: with the current bytecodes, every iteration of a backtracking greedy loop runs `jump + on_failure_jump`, whereas for a non-greedy loop every iteration runs just a single `on_failure_jump`. Yet those bytecodes predate the introduction of non-greedy loops :-) [ Of course, there are reasons for it, beside historical ones: it's harder to rewrite a loop that ends with `on_failure_dont_jump_smart` into one using `on_failure_keep_string_jump` :-( ] Stefan