From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: 32-bit MinGW build with JIT Date: Thu, 16 Aug 2018 20:35:26 +0300 Message-ID: <83y3d6gqox.fsf@gnu.org> References: <838t56iet0.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1534440877 19378 195.159.176.226 (16 Aug 2018 17:34:37 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 16 Aug 2018 17:34:37 +0000 (UTC) Cc: emacs-devel@gnu.org To: tom@tromey.com Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Aug 16 19:34:33 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 1fqMAK-0004tV-Bl for ged-emacs-devel@m.gmane.org; Thu, 16 Aug 2018 19:34:32 +0200 Original-Received: from localhost ([::1]:57410 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fqMCP-0005zi-3j for ged-emacs-devel@m.gmane.org; Thu, 16 Aug 2018 13:36:41 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:50138) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fqMBT-0005qY-5d for emacs-devel@gnu.org; Thu, 16 Aug 2018 13:35:44 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fqMBP-0001DR-7I for emacs-devel@gnu.org; Thu, 16 Aug 2018 13:35:43 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:47020) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fqMBP-0001DN-3b; Thu, 16 Aug 2018 13:35:39 -0400 Original-Received: from [176.228.60.248] (port=2940 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1fqMBN-0001M1-ME; Thu, 16 Aug 2018 13:35:38 -0400 In-reply-to: <838t56iet0.fsf@gnu.org> (message from Eli Zaretskii on Thu, 16 Aug 2018 17:09:15 +0300) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e 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:228603 Archived-At: > Date: Thu, 16 Aug 2018 17:09:15 +0300 > From: Eli Zaretskii > Cc: emacs-devel@gnu.org > > Anyway, what I wanted to tell is that as of now, it is very hard to > debug these problems. All the libjit types are "incomplete" as far as > GDB is concerned, there are no facilities to display libjit types and > values in human-readable form, C-level backtraces show ?? when a JIT > compiled function is called, etc. I didn't yet succeed in > establishing whether the invalid Lisp arguments for Ffuncall are > already invalid when we compile the function, or get corrupted as part > of compilation. > > I think we need to upgrade our debugging facilities, including adding > commands to .gdbinit, as part of working on this branch. Oh, and one more thing: I think we need a Lisp variable to disable JIT even if it has been compiled in. This should be important for debugging and testing, if nothing else.