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gh-119786: Remove mention of `_PyThreadState_BumpFramePointer` from `InternalDocs/interpreter.md` by efimov-mikhail · Pull Request #141816 · python/cpython · GitHub

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gh-119786: Remove mention of _PyThreadState_BumpFramePointer from InternalDocs/interpreter.md #141816

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Merged
hugovk merged 2 commits into from
Dec 16, 2025
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gh-119786: Remove mention of _PyThreadState_BumpFramePointer from InternalDocs/interpreter.md #141816

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bbe6b3d
Remove mention of _PyThreadState_BumpFramePointer
efimov-mikhail Nov 21, 2025
7c78bb1
Update InternalDocs/interpreter.md
efimov-mikhail Nov 21, 2025
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9 changes: 5 additions & 4 deletions InternalDocs/interpreter.md
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Original file line number Diff line number Diff line change
Expand Up @@ -226,10 +226,11 @@ Up through 3.10, the call stack was implemented as a singly-linked list of
heap allocation for the stack frame.

Since 3.11, frames are no longer fully-fledged objects. Instead, a leaner internal
`_PyInterpreterFrame` structure is used, which is allocated using a custom allocator
function (`_PyThreadState_BumpFramePointer()`), which allocates and initializes a
frame structure. Usually a frame allocation is just a pointer bump, which improves
memory locality.
`_PyInterpreterFrame` structure is used. Most frames are allocated contiguously in a
per-thread stack (see `_PyThreadState_PushFrame` in [Python/pystate.c](../Python/pystate.c)),
which improves memory locality and reduces overhead.
If the current `datastack_chunk` has enough space (`_PyThreadState_HasStackSpace`)
then the lightweight `_PyFrame_PushUnchecked` can be used instead of `_PyThreadState_PushFrame`.

Sometimes an actual `PyFrameObject` is needed, such as when Python code calls
`sys._getframe()` or an extension module calls
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