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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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12
Modules/_asynciomodule.c
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@ -216,7 +216,7 @@ get_future_loop(PyObject *fut)
return NULL;
}
if (getloop != NULL) {
PyObject *res = _PyObject_CallNoArg(getloop);
PyObject *res = PyObject_CallNoArgs(getloop);
Py_DECREF(getloop);
return res;
}
@ -328,7 +328,7 @@ get_event_loop(void)
return loop;
}
policy = _PyObject_CallNoArg(asyncio_get_event_loop_policy);
policy = PyObject_CallNoArgs(asyncio_get_event_loop_policy);
if (policy == NULL) {
return NULL;
}
@ -510,7 +510,7 @@ future_init(FutureObj *fut, PyObject *loop)
method, which is called during the interpreter shutdown and the
traceback module is already unloaded.
*/
fut->fut_source_tb = _PyObject_CallNoArg(traceback_extract_stack);
fut->fut_source_tb = PyObject_CallNoArgs(traceback_extract_stack);
if (fut->fut_source_tb == NULL) {
return -1;
}
@ -553,7 +553,7 @@ future_set_exception(FutureObj *fut, PyObject *exc)
}
if (PyExceptionClass_Check(exc)) {
exc_val = _PyObject_CallNoArg(exc);
exc_val = PyObject_CallNoArgs(exc);
if (exc_val == NULL) {
return NULL;
}
@ -2593,7 +2593,7 @@ task_step_impl(TaskObj *task, PyObject *exc)
if (!exc) {
/* exc was not a CancelledError */
exc = _PyObject_CallNoArg(asyncio_CancelledError);
exc = PyObject_CallNoArgs(asyncio_CancelledError);
if (!exc) {
goto fail;
}
@ -3308,7 +3308,7 @@ module_init(void)
PyObject *weak_set;
WITH_MOD("weakref")
GET_MOD_ATTR(weak_set, "WeakSet");
all_tasks = _PyObject_CallNoArg(weak_set);
all_tasks = PyObject_CallNoArgs(weak_set);
Py_CLEAR(weak_set);
if (all_tasks == NULL) {
goto fail;