Date: Mon, 27 Jul 2020 11:27:40 +0200 (CEST) From: Paul FLOYD <pjfloyd@wanadoo.fr> To: toolchain@FreeBSD.org Subject: Getting started with clang debuginfo Message-ID: <1139268534.2282.1595842060133.JavaMail.www@wwinf1m22>
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Hi =C2=A0 I'm investigating some of the remaining issues with Valgrind on FreeBSD. On= e of the two remaining major issues that I'm aware of is with Valgrind read= ing dwarf=C2=A0 debuginfo from clang compiled binaries. The problem isn't t= oo bad with clang 8 on FreeBSD 12.1. On 13-CURRENT with clang 10 things are= noticeably worse. For GCC built binaries I'm not aware of any issues. =C2=A0 I'm not familiar (yet) with the debuginfo code in Valgrind. =C2=A0 To get me going, does anyone have any pointers to - documentation on clang debuginfo - any info on differences wrt GCC (I have seen that GCC does have some debu= ginfo extensions) - any tools that would be useful like ascii dumps =C2=A0 A+ Paul =C2=A0 From owner-freebsd-toolchain@freebsd.org Mon Jul 27 14:38:00 2020 Return-Path: <owner-freebsd-toolchain@freebsd.org> Delivered-To: freebsd-toolchain@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AB4C7364A4A for <freebsd-toolchain@mailman.nyi.freebsd.org>; Mon, 27 Jul 2020 14:38:00 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 4BFj8S2rZLz3b8D for <freebsd-toolchain@freebsd.org>; Mon, 27 Jul 2020 14:38:00 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by mailman.nyi.freebsd.org (Postfix) id 5FCFA364A49; Mon, 27 Jul 2020 14:38:00 +0000 (UTC) Delivered-To: toolchain@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 5F91F364AC8 for <toolchain@mailman.nyi.freebsd.org>; Mon, 27 Jul 2020 14:38:00 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: from mail-il1-x143.google.com (mail-il1-x143.google.com [IPv6:2607:f8b0:4864:20::143]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BFj8R2R6rz3bBc for <toolchain@freebsd.org>; Mon, 27 Jul 2020 14:37:59 +0000 (UTC) (envelope-from markjdb@gmail.com) Received: by mail-il1-x143.google.com with SMTP id y18so4843249ilp.10 for <toolchain@freebsd.org>; Mon, 27 Jul 2020 07:37:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=y0qLWXzFkYkynnzKc6V5N3+Z3bvnqUPvN48kFgF/X8U=; b=CeN1e5J8CkDNA5QMHf+SwSHuQZZ3+06ncKxNltqZ4lloVWXj6J34PD/InXBC8tyoMp DrnNJOBskmSZ0yTdzpFNwOEODY5cRgtshLnni3jWeHRAi8dDox3MisDNikD8anOVqaUy cA0K1hYCJ0jKdd/62+CP6scNYLzedmMgiqkA8tJMnAhipB/SDOhGC2ZDzMCaGYt4h6c/ RG48NthFpwtaxTdBCJY9+PjLxjgZqvgOmz+3fvDwmtExeYGVwa5csy6k/++LxpfXXrVe ICdUqXuquiPaoeCPp+gSWp8Qm5H7GhNx7ioqEbljQG+0wWWX0EQ3We4EGvza+R+995Cj HMig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition :content-transfer-encoding:in-reply-to; bh=y0qLWXzFkYkynnzKc6V5N3+Z3bvnqUPvN48kFgF/X8U=; b=Si1z/BwH7sz1meNAhwFfGpcWmj6wKSE4Mxv5VEoF08sMicCpgGaTtY6qfLx8bsi/Ks G25/2BU33760frDmw0TjldzQ7BlIkYdwHfONBHBiMw9tI2QqDbnOAozdEqua9SXpw2HG crU2XfOJgWKxRQIzHa3DbCrWh8jOYcAdxA87T8OgGeJKXfCeMEQojxV0cXWXsy+C6pP+ A4aekowjlv00X8e9AVItiuDI8aZsSF/OGsMsytuhoIZ3rl6my7vNu1fNxq0GL1+vtwAp L+0gFGRgkVyCveRmWXlYV8sPybWH2W1Q0iSO9bmaE1/2WNe3oM1Zc7c1okRZL4zptiNQ XEmQ== X-Gm-Message-State: AOAM530P1WtEnNYeDoKrEBaFGIfg6JySQgfw7Y2b9HbFnAW2L4FWUMMD tjEE0+VMS03Cc8jC7FZYpl4= X-Google-Smtp-Source: ABdhPJxoB4rQiTdzsQTOhxKzZkbYdHnENs1Xzkf1T9umk1TPgR2qezsThqT66DKyY9dtpflpdhu0ZQ== X-Received: by 2002:a92:aa4b:: with SMTP id j72mr24813057ili.141.1595860678256; Mon, 27 Jul 2020 07:37:58 -0700 (PDT) Received: from raichu (toroon0560w-lp130-08-67-71-176-35.dsl.bell.ca. [67.71.176.35]) by smtp.gmail.com with ESMTPSA id b8sm2689732ilo.55.2020.07.27.07.37.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jul 2020 07:37:57 -0700 (PDT) Sender: Mark Johnston <markjdb@gmail.com> Date: Mon, 27 Jul 2020 10:37:53 -0400 From: Mark Johnston <markj@freebsd.org> To: Paul FLOYD <pjfloyd@wanadoo.fr> Cc: toolchain@freebsd.org Subject: Re: Getting started with clang debuginfo Message-ID: <20200727143753.GA59953@raichu> References: <1139268534.2282.1595842060133.JavaMail.www@wwinf1m22> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1139268534.2282.1595842060133.JavaMail.www@wwinf1m22> X-Rspamd-Queue-Id: 4BFj8R2R6rz3bBc X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=CeN1e5J8; dmarc=none; spf=pass (mx1.freebsd.org: domain of markjdb@gmail.com designates 2607:f8b0:4864:20::143 as permitted sender) smtp.mailfrom=markjdb@gmail.com X-Spamd-Result: default: False [-1.93 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; NEURAL_HAM_MEDIUM(-0.97)[-0.972]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; NEURAL_HAM_LONG(-0.96)[-0.960]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[toolchain@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::143:from]; NEURAL_HAM_SHORT(-0.30)[-0.301]; MID_RHS_NOT_FQDN(0.50)[]; FREEMAIL_TO(0.00)[wanadoo.fr]; FORGED_SENDER(0.30)[markj@freebsd.org,markjdb@gmail.com]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[markj@freebsd.org,markjdb@gmail.com]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-toolchain@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain <freebsd-toolchain.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-toolchain>, <mailto:freebsd-toolchain-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-toolchain/>; List-Post: <mailto:freebsd-toolchain@freebsd.org> List-Help: <mailto:freebsd-toolchain-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-toolchain>, <mailto:freebsd-toolchain-request@freebsd.org?subject=subscribe> X-List-Received-Date: Mon, 27 Jul 2020 14:38:00 -0000 On Mon, Jul 27, 2020 at 11:27:40AM +0200, Paul FLOYD wrote: > Hi > > I'm investigating some of the remaining issues with Valgrind on FreeBSD. One of the two remaining major issues that I'm aware of is with Valgrind reading dwarf debuginfo from clang compiled binaries. The problem isn't too bad with clang 8 on FreeBSD 12.1. On 13-CURRENT with clang 10 things are noticeably worse. For GCC built binaries I'm not aware of any issues. > > I'm not familiar (yet) with the debuginfo code in Valgrind. > > To get me going, does anyone have any pointers to > - documentation on clang debuginfo > - any info on differences wrt GCC (I have seen that GCC does have some debuginfo extensions) > - any tools that would be useful like ascii dumps Are you asking about tools to dump DWARF info? I've used dwarfdump (from ports) quite a bit in the past. readelf -w is similar and available in the base system.
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