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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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10
Modules/_datetimemodule.c
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@ -1528,8 +1528,8 @@ wrap_strftime(PyObject *object, PyObject *format, PyObject *timetuple,
ntoappend = 1;
}
else if ((ch = *pin++) == '\0') {
/* Null byte follows %, copy only '%'.
*
/* Null byte follows %, copy only '%'.
*
* Back the pin up one char so that we catch the null check
* the next time through the loop.*/
pin--;
@ -1619,7 +1619,7 @@ wrap_strftime(PyObject *object, PyObject *format, PyObject *timetuple,
usednew += ntoappend;
assert(usednew <= totalnew);
} /* end while() */
if (_PyBytes_Resize(&newfmt, usednew) < 0)
goto Done;
{
@ -3607,7 +3607,7 @@ tzinfo_reduce(PyObject *self, PyObject *Py_UNUSED(ignored))
getinitargs = _PyObject_GetAttrId(self, &PyId___getinitargs__);
if (getinitargs != NULL) {
args = _PyObject_CallNoArg(getinitargs);
args = PyObject_CallNoArgs(getinitargs);
Py_DECREF(getinitargs);
if (args == NULL) {
return NULL;
@ -3624,7 +3624,7 @@ tzinfo_reduce(PyObject *self, PyObject *Py_UNUSED(ignored))
getstate = _PyObject_GetAttrId(self, &PyId___getstate__);
if (getstate != NULL) {
state = _PyObject_CallNoArg(getstate);
state = PyObject_CallNoArgs(getstate);
Py_DECREF(getstate);
if (state == NULL) {
Py_DECREF(args);