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Title: GH-126910: Allow native profilers and debuggers to unwind through JIT frames by brandtbucher · Pull Request #143548 · python/cpython · GitHub

Open Graph Title: GH-126910: Allow native profilers and debuggers to unwind through JIT frames by brandtbucher · Pull Request #143548 · python/cpython

X Title: GH-126910: Allow native profilers and debuggers to unwind through JIT frames by brandtbucher · Pull Request #143548 · python/cpython

Description: Most unwinders will optimistically fall back to frame pointers if DWARF unwind info isn't present for a given frame. This patch enables frame pointers in JIT code on x86-64 Linux, by setting them in the "shim" frame and reserving the frame pointer register in the rest of the JIT code. @Fidget-Spinner can confirm that this works for the unwinders in https://github.com/pablogsal/cpython-unwind. Perf impact is neutral. Issue: gh-126910

Open Graph Description: Most unwinders will optimistically fall back to frame pointers if DWARF unwind info isn't present for a given frame. This patch enables frame pointers in JIT code on x86-64 Linux, by setting th...

X Description: Most unwinders will optimistically fall back to frame pointers if DWARF unwind info isn't present for a given frame. This patch enables frame pointers in JIT code on x86-64 Linux, by settin...

Opengraph URL: https://github.com/python/cpython/pull/143548

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d76d264 Reserve the frame pointer in JIT code brandtbucher Nov 27, 2025 https://github.com/python/cpython/pull/143548/commits/d76d264bc68994e539efc2aa638947363886b056
c214c07 shim -> trampoline brandtbucher Nov 28, 2025 https://github.com/python/cpython/pull/143548/commits/c214c070e414dea0686696fe2c86cb46a56429ed
8cfff6f trampoline -> shim brandtbucher Jan 8, 2026 https://github.com/python/cpython/pull/143548/commits/8cfff6f47cb4aaf437c7180a1a8b5c7adcd7b30e
766d404 Clean up brandtbucher Jan 8, 2026 https://github.com/python/cpython/pull/143548/commits/766d40435208756a61f282e56afb40120e9d0b43
ae8649f blurb add brandtbucher Jan 8, 2026 https://github.com/python/cpython/pull/143548/commits/ae8649fba3a7d5cfde726dc89ddec2e1940fbc57
8c038c8 Merge branch 'main' into jit-unwind brandtbucher Mar 21, 2026 https://github.com/python/cpython/pull/143548/commits/8c038c8cf8283081a9d30c8ed6dea429d42a5c28
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