[issue28870] Refactor PyObject_CallFunctionObjArgs() and like

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> What do you think of using alloca() instead of an "PyObject *small_stack[5];" which has a fixed size?

alloca() is not in POSIX.1. I afraid it would make CPython less portable.

> Note: About your patch, try to avoid _PyObject_CallArg1() if you care of the usage of the C stack, see issue #28858.

I don't understand how can I avoid it.

> How do you check the stack consumption of PyObject_CallFunctionObjArgs()?

Using a script from issue28858.

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