Description

Zheaoli

opened on May 4, 2025

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Feature or enhancement

Proposal:

The GDB support a special interface for JIT. The developer can inject some debug info into the JITed code. Both of the LuaJIT and V8 are support GDBJIT

FYI:

1. https://sourceware.org/gdb/current/onlinedocs/gdb.html/JIT-Interface.html
2. https://v8.dev/docs/gdb-jit
3. https://github.com/v8/v8/blob/main/src/diagnostics/gdb-jit.cc
4. https://github.com/LuaJIT/LuaJIT/blob/v2.1/src/lj_gdbjit.c

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Reacted by Yao Zi, Wulian233 and Abduaziz

Activity

1. Zheaoli

   added

   type-featureA feature request or enhancementA feature request or enhancement

   on May 4, 2025
2. Zheaoli commented on May 4, 2025

   

   Zheaoli

   on May 4, 2025

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   Need a topic-jit tag
3. picnixz

   added

   triagedThe issue has been accepted as valid by a triager.The issue has been accepted as valid by a triager.

   topic-JIT

   on May 4, 2025
4. Fidget-Spinner commented on May 4, 2025

   

   Fidget-Spinner

   on May 4, 2025

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   I think Pablo is proposing something similar here? #126910
5. Zheaoli commented on May 4, 2025

   

   Zheaoli

   on May 4, 2025

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   I think Pablo is proposing something similar here? #126910

   I think this is a liitle bit different with @pablogsal idea in #126910. I will explain this below.

   In #126910, @pablogsal proposes to compile the template code with a frame pointer. So we can debug the JIT code itself more easy.

   But for the gdbjit, the main target is that we can indicate the Python code with the JIT code in gdb.

   For example, the following this a demo in luajit with gdbjit

   

   Reacted by Ken Jin
6. pablogsal commented on May 5, 2025

   

   pablogsal

   on May 5, 2025

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   I also have a PR that implements precisely this but that was partially turned down because adding the ELF metadata to make gdb understand jit frames was deemed too slow when I discussed with @brandtbucher.

   If there is consensus I can resurrect that code and make it opt in.

   Reacted by Nadeshiko Manju

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