INADA Naoki added the comment:
I think basic idea is "wrap unknown function call at least once, and preferably
only once".
_PyEval_EvalFrameDefault() calls Py_EnterRecursiveCall("").
So wrapping PyFunction_(Fast)Call* with Py_EnterRecursiveCall() seems redundant.
On the other hand, PyCFunction may calls method of extension module,
and it can cause recursive call.
So I think PyCFunction_*Call* methods calling function pointer it has
(e.g. _PyCFunction_FastCallKeywords) should call Py_EnterRecursiveCall().
And caller of them can skip Py_EnterRecursiveCall().
For example, _PyObject_FastCallDict() may call _PyFunction_FastCallDict() or
_PyCFunction_FastCallDict(), or tp_fastcall (via _Py_RawFastCallDict) or
tp_call.
It can wrap all, but wrapping only tp_fastcall and tp_call is better.
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<http://bugs.python.org/issue29306>
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