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bpo-37194: Add a new public PyObject_CallNoArgs() function (GH-13890)

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Add a new public PyObject_CallNoArgs() function to the C API: call a
callable Python object without any arguments.

It is the most efficient way to call a callback without any argument.
On x86-64, for example, PyObject_CallFunctionObjArgs(func, NULL)
allocates 960 bytes on the stack per call, whereas
PyObject_CallNoArgs(func) only allocates 624 bytes per call.

It is excluded from stable ABI 3.8.

Replace private _PyObject_CallNoArg() with public
PyObject_CallNoArgs() in C extensions: _asyncio, _datetime,
_elementtree, _pickle, _tkinter and readline.
This commit is contained in:
Victor Stinner 2019-06-17 14:27:23 +02:00 • committed by GitHub
parent 8bf08ee45b
commit 2ff58a24e8
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12 changed files with 51 additions and 17 deletions
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6
Include/abstract.h
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@ -141,6 +141,12 @@ extern "C" {
#endif
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03090000
/* Call a callable Python object without any arguments */
PyAPI_FUNC(PyObject *) PyObject_CallNoArgs(PyObject *func);
#endif
/* Call a callable Python object 'callable' with arguments given by the
tuple 'args' and keywords arguments given by the dictionary 'kwargs'.