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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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GPG key ID: 4AEE18F83AFDEB23
12 changed files with 51 additions and 17 deletions
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4
Modules/_pickle.c
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@ -1274,7 +1274,7 @@ _Unpickler_ReadFromFile(UnpicklerObject *self, Py_ssize_t n)
return -1;
if (n == READ_WHOLE_LINE) {
data = _PyObject_CallNoArg(self->readline);
data = PyObject_CallNoArgs(self->readline);
}
else {
PyObject *len;
@ -4411,7 +4411,7 @@ save(PicklerObject *self, PyObject *obj, int pers_save)
/* Check for a __reduce__ method. */
reduce_func = _PyObject_GetAttrId(obj, &PyId___reduce__);
if (reduce_func != NULL) {
reduce_value = _PyObject_CallNoArg(reduce_func);
reduce_value = PyObject_CallNoArgs(reduce_func);
}
else {
PyErr_Format(st->PicklingError,