Jonas Devlieghere

@jdevlieghere
152 Followers
122 Following
18 Posts
Compilers & Debuggers
Websitehttps://jonasdevlieghere.com
GitHubhttps://github.com/JDevlieghere
Jonas DevlieghereMar 5
Swift LanguageMar 4
Great language support means nothing without great tooling. Watch @jdevlieghere show how LLDB brings first-class debugging to Swift on WebAssembly. https://fosdem.org/2026/schedule/event/87ZLQV-wasm-debugging-lldb/ #Wasm #fosdem
Show threadJonas DevlieghereFeb 26
@cfallin I posted this before I even saw your demo. I'm very impressed you already got it working. If the code is available somewhere, I'd be more than happy to look into the LLDB crash.
Jonas DevlieghereFeb 26

Super excited to see the Wasm support in LLDB mentioned today by @cfallin at the Bytecode Alliance Plumbers Summit.

https://www.youtube.com/watch?v=Z2xWzc28SIc

Jonas DevlieghereFeb 18
Minsoo Choo Feb 18

My work on LLDB’s FreeBSDKernel plugin:
https://minsoo.io/future-of-the-freebsd-kernel-lldb-plugin/

The name FreeBSDKernel will be changed to FreeBSD-core, since it only provides functionalities to examine core dumps. Traditional live kernel debugging is done through gdb-remote plugin with FreeBSD’s gdb stub.

Future of the FreeBSD Kernel LLDB Plugin

FreeBSD offers several approaches to kernel debugging: DDB, live kernel debugging, and core dump analysis. DDB is an interactive debugger built directly into the FreeBSD kernel, with syntax inspired by GDB — making it immediately familiar to most developers. Live debugging leverages FreeBSD's GDB stub (defined under sys/gdb); on the

Minsoo Choo
Jonas DevlieghereFeb 18
Syntax Highlighting in LLDB with Tree-sitter
https://jonasdevlieghere.com/post/tree-sitter-syntax-highlighting-in-lldb/
Jonas DevlieghereFeb 10
My team at Apple is hiring Debugger Engineer to work on LLDB in London: https://jobs.apple.com/en-gb/details/200643284/debugger-engineer
If you’re interested, please submit your CV through the website. Feel free to get in touch with me if you have any questions!
Debugger Engineer - Jobs at Apple (UK)

Apply for a Debugger Engineer job at Apple. Read about the role and find out if it’s right for you.

Jonas DevlieghereJan 20
LLVM WeeklyJan 19
LLVM Weekly - #629, January 19th 2026. Nominations for area team elections open, LLDB developments in 2025, 22.x branched, "human in the loop" AI contribution policy, advanced symbol resolution for clang-repl, optimising conditional traps on x86-64, and more. https://llvmweekly.org/issue/629
LLVM Weekly - #629, January 19th 2026

Jonas DevlieghereJan 15

I published a new blog post: LLDB in 2025

https://jonasdevlieghere.com/post/lldb-2025/

LLDB in 2025

This post summarizes the major areas of development in LLDB in 2025. I was inspired by Nikita Popov’s “This year in LLVM” and thought it would be interesting to do something similar for LLDB. My goal was to cover the whole project, rather than focusing on my own contributions.1 As the maintainer, I try to look at every single LLDB PR, but my level of engagement varies. I expect there will be a subconscious bias towards the efforts I was involved in.

Jonas DevlieghereJan 11
Nikita PopovJan 11

New blog post: "LLVM: The bad parts"
https://www.npopov.com/2026/01/11/LLVM-The-bad-parts.html

I had some fun writing this :)

LLVM: The bad parts

Jonas DevlieghereJan 10
Swift LanguageJan 9
FOSDEM, the legendary open source gathering in Brussels, is coming soon, and we'd love to see you there! We've got multiple talks on Swift plus a pre-FOSDEM community meetup. Whether you're a longtime attendee or new to the event, come say hi! 👋 https://swiftlang.github.io/event-fosdem/ #FOSDEM
Swift @ FOSDEM 2026