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[3.15] gh-161827: Mark _PyEval_EvalFrameDefault as Py_NO_INLINE (GH-161829) #161833

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[3.15] gh-161827: Mark _PyEval_EvalFrameDefault as Py_NO_INLINE (GH-161829) #161833

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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-11-11-21-52-02.gh-issue-161827.3PD3RK.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
Keep ``_PyEval_EvalFrameDefault`` as a separate frame in the C call stack
when Python is built with the tail-calling interpreter
(:option:`--with-tail-call-interp`), so that stack unwinders, profilers and
other tools that walk the stack can find the interpreter loop.
8 changes: 7 additions & 1 deletion Python/ceval.c
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Expand Up @@ -1238,7 +1238,13 @@ dtrace_function_return(_PyInterpreterFrame *frame)
}
#endif

PyObject* _Py_HOT_FUNCTION DONT_SLP_VECTORIZE
/*
* _PyEval_EvalFrameDefault must remain a separate frame in the C call stack:
* stack unwinders, profilers and other tools that walk the stack use it to
* find the interpreter loop. With the tail-calling interpreter it is small
* enough to be inlined into its callers, e.g. by Clang with PGO.
*/
Py_NO_INLINE PyObject* _Py_HOT_FUNCTION DONT_SLP_VECTORIZE
_PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int throwflag)
{
_Py_EnsureTstateNotNULL(tstate);
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