From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25223 invoked by alias); 4 Apr 2017 08:25:11 -0000 Mailing-List: contact elfutils-devel-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Post: List-Help: List-Subscribe: Sender: elfutils-devel-owner@sourceware.org Received: (qmail 25204 invoked by uid 89); 4 Apr 2017 08:25:10 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Checked: by ClamAV 0.99.2 on sourceware.org X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.5 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2 spammy=Hx-languages-length:1562, products, shipped, excel X-Spam-Status: No, score=-2.5 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on sourceware.org X-Spam-Level: X-HELO: EUR01-VE1-obe.outbound.protection.outlook.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qtcompany.onmicrosoft.com; s=selector1-qt-io; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=T2UvqgFYJ8kZY83GKo+syWeHT5Ky4xS60TW8h6I1WP4=; b=Gxej8Tar67SF76igvh2Oko9SnMQaReWs9Ny8gUDPS2OnNKTnD5tv0MFQ3B64yetjK0Ejq1Ju1oaEkQfsd6AKuMWn0uWNjZIFlJnmScI11GqwW/POYmMvOr3vTksA6pTQzp3aocpTyp9ZUVwGpwiC9FjJJ1pn30UP7djcnrGAnx0= Authentication-Results: klomp.org; dkim=none (message not signed) header.d=none;klomp.org; dmarc=none action=none header.from=qt.io; Subject: Re: frame unwinding patches To: Jan Kratochvil , Milian Wolff References: <1487201610-8381-1-git-send-email-mark@klomp.org> <3915502.JGE1jdPxOT@milian-kdab2> <20170403212325.GA21599@host1.jankratochvil.net> <2050042.dvQtNuZMzI@milian-kdab2> <20170404075532.GA11810@host1.jankratochvil.net> CC: , Mark Wielaard From: Ulf Hermann Message-ID: <069f0297-7c48-faf3-694f-dee2919f4edc@qt.io> Date: Tue, 04 Apr 2017 08:25:00 -0000 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20170404075532.GA11810@host1.jankratochvil.net> Content-Type: text/plain; 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When you only got a binary blob and have to make do with it, you cannot >> tell people to "just fix the compiler invocation". > > This is their problem they support a vendor who cripples usage of their > products. There is also Intel and AMD. Sorry, but I cannot tell everybody with binary-only graphics drivers that they cannot use perfparser. That's probably the majority of embedded devices and a large number of desktops. >> - Some JIT compilers, like QV4, actually embed frame pointers into their >> dynamic code, but do not go the extra mile for generating DWARF data or >> asynchronous unwind tables. That is another case where the patches by Ulf >> excel and make elfutils much more useful. > > In such case elfutils could provide some workaround with a new eu-stack option: > --please-workaround-a-completely-broken-compiler-i-still-have-not-fixed Frame pointers are the easiest way to include unwinding information into a binary and they require less work from the compiler than other methods. With JIT compilers, compile time matters much more than with ahead of time compilers. Also, adding extra code to the compiler has to be justified in that case as the compiler is shipped inside the libQt5Qml binary and loaded into memory whenever you run some QML. So, I think frame pointers are a perfectly valid option for unwinding and should be supported.