gh-106023: Remove _PY_FASTCALL_SMALL_STACK constant by vstinner · Pull Request #106258 · python/cpython
#include "pycore_pystate.h" // _PyThreadState_GET()
/* Suggested size (number of positional arguments) for arrays of PyObject* allocated on a C stack to avoid allocating memory on the heap memory. Such array is used to pass positional arguments to call functions of the PyObject_Vectorcall() family.
The size is chosen to not abuse the C stack and so limit the risk of stack overflow. The size is also chosen to allow using the small stack for most function calls of the Python standard library. On 64-bit CPU, it allocates 40 bytes on the stack. */ #define _PY_FASTCALL_SMALL_STACK 5
// Export for shared stdlib extensions like the math extension, // function used via inlined _PyObject_VectorcallTstate() function. PyAPI_FUNC(PyObject*) _Py_CheckFunctionResult(