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Jonas Devlieghere

@jdevlieghere.mastodon.social.ap.brid.gy

Compilers & Debuggers 🌉 bridged from ⁂ https://mastodon.social/@jdevlieghere, follow @ap.brid.gy to interact

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Jonas Devlieghere@jdevlieghere.mastodon.social.ap.brid.gy · 3mo ago

I wrote an update about breaking the rev lock between LLDB & Python: https://jonasdevlieghere.com/post/breaking-lldb-python-revlock/

Breaking the LLDB/Python Revlock

Since its inception, scripting has been an integral part of LLDB. At the time, Python was chosen as the primary, and for a long time the only supported, scripting language. Python is used within LLDB to automate things, write custom data formatters, and extend core concepts like Processes and Threads with an implementation written in Python. Another powerful way to use LLDB is as a debugger library in Python, by importing the lldb module.

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Jonas Devlieghere@jdevlieghere.mastodon.social.ap.brid.gy · 5mo ago

New blog post: https://jonasdevlieghere.com/post/dsymutil-parallel-linker/ Thanks @SmileyKeith for getting the ball rolling (again) with this discourse post: https://discourse.llvm.org/t/llvm-dsymutil-performance/89051

Adopting the Parallel DWARF linker in dsymutil

On Apple platforms, the development experience was designed around making the compile-link-debug cycle as fast as possible. For debugging, that means that rather than processing large amounts of DWARF to link it into the final binary, the linker leaves the debug info in the object files and records a debug map that tells the debugger where to find it. When you’re debugging locally, that’s all you need. But if you want to archive the debug info for crash reporting or remote debugging, you need a way to produce a self-contained bundle.

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Jonas Devlieghere@jdevlieghere.mastodon.social.ap.brid.gy · 6mo ago

https://jonasdevlieghere.com/post/lldb-mte-test-suite

Enabling MTE for the LLDB Test Suite

Enhanced Memory Tagging Extension (EMTE) is a hardware-based security technology to protect against memory corruption vulnerabilities. Memory allocations are tagged with a secret key. When memory is accessed, the hardware validates the tag, and if it doesn’t match, stops the process. EMTE is the foundation of Apple’s Memory Integrity Enforcement (MIE). It’s available on A19 and M5 processors or later. Using MTE for Finding Bugs (E)MTE is not just valuable in a security context.

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Jonas Devlieghere@jdevlieghere.mastodon.social.ap.brid.gy · 7mo ago

Syntax Highlighting in LLDB with Tree-sitter https://jonasdevlieghere.com/post/tree-sitter-syntax-highlighting-in-lldb/

Syntax Highlighting in LLDB with Tree-sitter

LLDB comes with built-in syntax highlighting for C-based languages. It does so using the embedded clang compiler. Other languages following this model of embedding the compiler, such as Swift, can take a similar approach. Motivation There are two important use cases where relying on the compiler for syntax highlighting doesn’t work: Some languages, like Rust and Zig, don’t have their own type system and instead reuse the Clang type system. LLDB has the ability to create synthetic stack frames representing any language, including interpreter languages like Python.

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