From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 96160 invoked by alias); 9 Sep 2018 02:54:52 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Received: (qmail 96112 invoked by uid 89); 9 Sep 2018 02:54:50 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-3.0 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy= X-HELO: gateway23.websitewelcome.com Received: from gateway23.websitewelcome.com (HELO gateway23.websitewelcome.com) (192.185.50.185) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Sun, 09 Sep 2018 02:54:48 +0000 Received: from cm15.websitewelcome.com (cm15.websitewelcome.com [100.42.49.9]) by gateway23.websitewelcome.com (Postfix) with ESMTP id A87AE8D5F for ; Sat, 8 Sep 2018 21:54:47 -0500 (CDT) Received: from box5379.bluehost.com ([162.241.216.53]) by cmsmtp with SMTP id yps7fFGH0bXuJyps7fYoiO; Sat, 08 Sep 2018 21:54:47 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tromey.com; s=default; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=/X7gf2hMgd7Cgr54gicYx9ZMUS2fzAVZTRxTKQbg/ag=; b=BryYiv44wnzYyD63on8eIR+LZ9 e1asvNex/aNLBtGFOwE9iW4lKUQ+XO0JK8IRWwS7d1kZ42CQ8EBd2MpT7Jm3XPRJPG9RAgXyzQcGQ NJB17BD+AbLlCsKEkbBJwftPE; Received: from 75-166-85-72.hlrn.qwest.net ([75.166.85.72]:42958 helo=bapiya) by box5379.bluehost.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91) (envelope-from ) id 1fyps7-003a5E-DS; Sat, 08 Sep 2018 21:54:47 -0500 From: Tom Tromey To: Simon Marchi Cc: Andrew Burgess , Simon Marchi , gdb-patches@sourceware.org Subject: Re: [PATCHv4] gdb: Add default frame methods to gdbarch References: <20180907212619.27618-1-andrew.burgess@embecosm.com> <77e448ed-d394-88b3-c73a-ab87ec2f8c38@ericsson.com> <20180908231921.GJ22193@embecosm.com> Date: Sun, 09 Sep 2018 02:54:00 -0000 In-Reply-To: (Simon Marchi's message of "Sun, 09 Sep 2018 00:52:43 +0100") Message-ID: <878t4b5qix.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-SW-Source: 2018-09/txt/msg00219.txt.bz2 >>>>> "Simon" == Simon Marchi writes: Simon> Ok, that's interesting. My hypothesis is that when GDB needs to watch Simon> an expression (a + b + c), it probably looks at the all_values chain Simon> to know all the intermediary values (that represent a memory location Simon> or a register) that were read from the target to evaluate that Simon> expression. It then puts some hardware or software watches on these Simon> memory locations or registers. So if the values chain contains a Simon> value representing something we don't really watch to watch (such as Simon> fp or sp, according to the comment), GDB would watch it, even though Simon> it doesn't really affect the result of the expression. That's just my Simon> guess. Yes, that's correct. Simon> I am fine with that (unless someone who really knows this comes up Simon> with a better explanation). Since it just causes the value we don't Simon> need anymore to be deleted immediatly, it should be harmless. I agree. Tom