Support gdbjit for CPython

[Zheaoli]

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

[Zheaoli]

Need a topic-jit tag

[Fidget-Spinner]

I think Pablo is proposing something similar here? #126910

[Zheaoli]

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

[pablogsal]

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.