From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14468 invoked by alias); 7 Oct 2003 21:48:45 -0000 Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sources.redhat.com Received: (qmail 14461 invoked from network); 7 Oct 2003 21:48:44 -0000 Received: from unknown (HELO nevyn.them.org) (66.93.172.17) by sources.redhat.com with SMTP; 7 Oct 2003 21:48:44 -0000 Received: from drow by nevyn.them.org with local (Exim 4.22 #1 (Debian)) id 1A6zh2-00034Z-Kc; Tue, 07 Oct 2003 17:48:32 -0400 Date: Tue, 07 Oct 2003 21:48:00 -0000 From: Daniel Jacobowitz To: Daniel Berlin , Josef Zlomek Cc: Richard Henderson , gdb@sources.redhat.com Subject: Re: Problem with location lists and variables on stack Message-ID: <20031007214832.GA11708@nevyn.them.org> Mail-Followup-To: Daniel Berlin , Josef Zlomek , Richard Henderson , gdb@sources.redhat.com References: <20031001154415.GA15387@artax.karlin.mff.cuni.cz> <20031001155417.GA13942@nevyn.them.org> <20031001160318.GA17042@artax.karlin.mff.cuni.cz> <20031001162255.GA25428@nevyn.them.org> <20031001174142.GA21499@artax.karlin.mff.cuni.cz> <20031001174427.GA13387@nevyn.them.org> <20031006062216.GB26462@redhat.com> <20031006064016.GA13046@artax.karlin.mff.cuni.cz> <20031006134604.GA31005@nevyn.them.org> <1BEF617C-F80C-11D7-8E4F-000A95AF1FAE@dberlin.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1BEF617C-F80C-11D7-8E4F-000A95AF1FAE@dberlin.org> User-Agent: Mutt/1.5.1i X-SW-Source: 2003-10/txt/msg00126.txt.bz2 On Mon, Oct 06, 2003 at 10:48:12AM -0400, Daniel Berlin wrote: > >>Daniel Berlin has already written support for GCC to generate location > >>list for DW_AT_frame_base. > >>DW_AT_frame_base is a location list as any other (actually only the > >>offsets relatively to original stack pointer at function start are > >>needed). > >>GDB then uses this location list to adjust offsets of other variables > >>addressed using stack pointer. > >>With Daniel Jacobowitz's fix for GDB it works :-) > >>i.e. you can see correct values for variables located on stack > >>even when stack pointer changes because of push, pop, etc. > >> > >>Current GCC patch can be downloaded from: > >>http://artax.karlin.mff.cuni.cz/~zlomj9am/download/vt-main.patch > >> > >>(because currently GCC is in stage 2 it has to wait until GCC is in > >>stage 1) > > > >I suppose this is true, but it's really unfortunate. > > I'm not so sure it's true. > > This isn't a major change, really and it's only going to make things > better (We didn't use to support -O2 -g at all, really, and now we can. > There can't be any regressions from an unsupported state to a > supported one). It's also not an optimization pass, so the risk is > relatively low. Well, FWIW I'd like to see this included. Josef, do you have any interest in submiting it for 3.4, to see what reaction it gets at least? -- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer