Personal blog en-us Technology https://www.jviotti.com https://www.jviotti.com/me.webp Mon, 04 May 2026 22:35:58 +0000 Mon, 04 May 2026 22:35:58 +0000 A short guide to studying the assembly code generated by AppleClang for C++ projects using Xcode Instruments Fri, 21 Mar 2025 00:00:00 +0000 https://www.jviotti.com/2025/03/21/studying-cpp-generated-assembly-using-xcode-instruments.html https://www.jviotti.com/2025/03/21/studying-cpp-generated-assembly-using-xcode-instruments.html This article explains how to install and configure the Intel VTune Profiler on Fedora to use advanced analysis such as the Memory Access tool Tue, 08 Oct 2024 00:00:00 +0000 https://www.jviotti.com/2024/10/08/running-the-intel-vtune-profiler-on-fedora.html https://www.jviotti.com/2024/10/08/running-the-intel-vtune-profiler-on-fedora.html A high-level introduction to using the CDB command-line debugger in the context of C++ programs Thu, 09 May 2024 00:00:00 +0000 https://www.jviotti.com/2024/05/09/debugging-msvc-cpp-crashes-from-the-terminal-using-cdb.html https://www.jviotti.com/2024/05/09/debugging-msvc-cpp-crashes-from-the-terminal-using-cdb.html This article is an overview of how to use Xcode Instruments along its `xctrace` command-line tool companion to perform CPU profiling of C++ programs Mon, 29 Jan 2024 00:00:00 +0000 https://www.jviotti.com/2024/01/29/using-xcode-instruments-for-cpp-cpu-profiling.html https://www.jviotti.com/2024/01/29/using-xcode-instruments-for-cpp-cpu-profiling.html This article describes how the Objective-C `BOOL` type is differently defined on Apple platforms, and how these differences are defined in LLVM Fri, 05 Jan 2024 00:00:00 +0000 https://www.jviotti.com/2024/01/05/is-objective-c-bool-a-boolean-type-it-depends.html https://www.jviotti.com/2024/01/05/is-objective-c-bool-a-boolean-type-it-depends.html This article describes how to transpile Objective-C to C++, and use that approach to gain understanding of the Objective-C runtime Fri, 01 Dec 2023 00:00:00 +0000 https://www.jviotti.com/2023/12/01/understanding-objective-c-by-transpiling-it-to-cpp.html https://www.jviotti.com/2023/12/01/understanding-objective-c-by-transpiling-it-to-cpp.html This article describes how LLDB can be used to mutate return values of Objective-C methods and functions Wed, 22 Nov 2023 00:00:00 +0000 https://www.jviotti.com/2023/11/22/spoofing-objective-c-return-values-on-apple-silicon-using-lldb.html https://www.jviotti.com/2023/11/22/spoofing-objective-c-return-values-on-apple-silicon-using-lldb.html This article describes a series of approaches for reverse engineering macOS private frameworks Mon, 20 Nov 2023 00:00:00 +0000 https://www.jviotti.com/2023/11/20/exploring-macos-private-frameworks.html https://www.jviotti.com/2023/11/20/exploring-macos-private-frameworks.html This article describes how to build iOS applications using Objective-C with CMake instead of plain Xcode Wed, 21 Dec 2022 00:00:00 +0000 https://www.jviotti.com/2022/12/21/building-objective-c-ios-apps-with-cmake.html https://www.jviotti.com/2022/12/21/building-objective-c-ios-apps-with-cmake.html This article explores how to write iOS applications with Objective-C without making use of traditional Storyboards Wed, 14 Dec 2022 00:00:00 +0000 https://www.jviotti.com/2022/12/14/writing-objective-c-ios-apps-without-storyboards.html https://www.jviotti.com/2022/12/14/writing-objective-c-ios-apps-without-storyboards.html This article describes in detail how to launch macOS application bundles from the command line Mon, 28 Nov 2022 00:00:00 +0000 https://www.jviotti.com/2022/11/28/launching-macos-applications-from-the-command-line.html https://www.jviotti.com/2022/11/28/launching-macos-applications-from-the-command-line.html This article describes a novel system-independent approach to performance testing using tracing Wed, 07 Sep 2022 00:00:00 +0000 https://www.jviotti.com/2022/09/07/performance-testing-through-proportional-traces.html https://www.jviotti.com/2022/09/07/performance-testing-through-proportional-traces.html This article describes in detail how to symbolicalize Electron.js native crashes on GNU/Linux Mon, 11 Jul 2022 00:00:00 +0000 https://www.jviotti.com/2022/07/11/debugging-electronjs-native-crashes-on-linux.html https://www.jviotti.com/2022/07/11/debugging-electronjs-native-crashes-on-linux.html This article describes how to use LLDB on C++ standard library code on macOS Thu, 05 May 2022 00:00:00 +0000 https://www.jviotti.com/2022/05/05/debugging-the-cxx-standard-library-on-macos.html https://www.jviotti.com/2022/05/05/debugging-the-cxx-standard-library-on-macos.html This article describes how to use LLDB to debug production builds of Electron.js on macOS Thu, 24 Feb 2022 00:00:00 +0000 https://www.jviotti.com/2022/02/24/attaching-lldb-to-production-electron-builds-on-macos.html https://www.jviotti.com/2022/02/24/attaching-lldb-to-production-electron-builds-on-macos.html This article describes how to use the macOS Signposts API from C++ applications Mon, 21 Feb 2022 00:00:00 +0000 https://www.jviotti.com/2022/02/21/emitting-signposts-to-instruments-on-macos-using-cpp.html https://www.jviotti.com/2022/02/21/emitting-signposts-to-instruments-on-macos-using-cpp.html This article describes in detail how to symbolicalize Electron.js native crashes on macOS Wed, 08 Dec 2021 00:00:00 +0000 https://www.jviotti.com/2021/12/08/debugging-electronjs-native-crashes-on-macos.html https://www.jviotti.com/2021/12/08/debugging-electronjs-native-crashes-on-macos.html This article makes a case on why employers should not attempt to own the IP of the contributions of their employees Fri, 26 Nov 2021 00:00:00 +0000 https://www.jviotti.com/2021/11/26/employers-should-not-own-open-source-contributions.html https://www.jviotti.com/2021/11/26/employers-should-not-own-open-source-contributions.html This article describes in detail how Mach-O universal binaries work Fri, 23 Jul 2021 00:00:00 +0000 https://www.jviotti.com/2021/07/23/a-deep-dive-on-macos-universal-binaries.html https://www.jviotti.com/2021/07/23/a-deep-dive-on-macos-universal-binaries.html This article describes the back story behind a Chromium CL to restore SCCACHE support on Windows Wed, 07 Jul 2021 00:00:00 +0000 https://www.jviotti.com/2021/07/07/speeding-up-windows-electron-builds-with-sccache.html https://www.jviotti.com/2021/07/07/speeding-up-windows-electron-builds-with-sccache.html This article describes how to build Electron.js on Windows using only the Visual Studio Build Tools offering Mon, 05 Jul 2021 00:00:00 +0000 https://www.jviotti.com/2021/07/05/building-electron-on-windows-using-the-visual-studio-build-tools.html https://www.jviotti.com/2021/07/05/building-electron-on-windows-using-the-visual-studio-build-tools.html This article describes an experimental approach to describing HTTP API integration tests Tue, 30 Oct 2018 00:00:00 +0000 https://www.jviotti.com/2018/10/30/evolutive-integration-testing-of-http-apis-with-openapi.html https://www.jviotti.com/2018/10/30/evolutive-integration-testing-of-http-apis-with-openapi.html This article describes a trick for easily switching between multiple NPM accounts on the terminal Wed, 28 Mar 2018 00:00:00 +0000 https://www.jviotti.com/2018/03/28/easily-switch-between-many-npm-accounts.html https://www.jviotti.com/2018/03/28/easily-switch-between-many-npm-accounts.html This article introduces the numeric types available in Ada 2012 Tue, 05 Dec 2017 00:00:00 +0000 https://www.jviotti.com/2017/12/05/an-introduction-to-adas-simple-numeric-types.html https://www.jviotti.com/2017/12/05/an-introduction-to-adas-simple-numeric-types.html This article is an overview of array types in Ada 2012 Sat, 18 Nov 2017 00:00:00 +0000 https://www.jviotti.com/2017/11/18/an-overview-of-arrays-in-ada-2012.html https://www.jviotti.com/2017/11/18/an-overview-of-arrays-in-ada-2012.html This article describes how to package an Electron application for Windows without additional tooling Fri, 09 Dec 2016 00:00:00 +0000 https://www.jviotti.com/2016/12/09/how-to-manually-package-an-electron-app-for-windows.html https://www.jviotti.com/2016/12/09/how-to-manually-package-an-electron-app-for-windows.html This article discusses how to code-sign OS X Electron apps using Travis CI Wed, 16 Mar 2016 00:00:00 +0000 https://www.jviotti.com/2016/03/16/how-to-code-sign-os-x-electron-apps-in-travis-ci.html https://www.jviotti.com/2016/03/16/how-to-code-sign-os-x-electron-apps-in-travis-ci.html This article discusses a Chromium sandboxing permission error when executing an Electron application as root on GNU/Linux Fri, 19 Feb 2016 00:00:00 +0000 https://www.jviotti.com/2016/02/19/fixing-a-baffling-issue-when-running-electron-as-root-in-gnu-linux.html https://www.jviotti.com/2016/02/19/fixing-a-baffling-issue-when-running-electron-as-root-in-gnu-linux.html This article discusses a file permissions error on Electron that can affect spawning, and an upstream fix for it Wed, 17 Feb 2016 00:00:00 +0000 https://www.jviotti.com/2016/02/17/debugging-electron-to-run-shell-scripts-in-a-packaged-application.html https://www.jviotti.com/2016/02/17/debugging-electron-to-run-shell-scripts-in-a-packaged-application.html