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Remove explicit empty tuple reuse in cpickle. 

PyTuple_New(0) always returns the same empty tuple from its free list anyway,
so we are not saving much here. Plus, the code where this was used is on
uncommon run paths.
This commit is contained in:
Alexandre Vassalotti 2013-11-28 15:17:29 -08:00
parent b13e6bcbd8
commit 6bf41e54a4
1 changed files with 6 additions and 12 deletions
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18
Modules/_pickle.c
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@ -166,9 +166,6 @@ typedef struct {
/* codecs.encode, used for saving bytes in older protocols */
PyObject *codecs_encode;
/* As the name says, an empty tuple. */
PyObject *empty_tuple;
} PickleState;
/* Forward declaration of the _pickle module definition. */
@ -205,7 +202,6 @@ _Pickle_ClearState(PickleState *st)
Py_CLEAR(st->name_mapping_3to2);
Py_CLEAR(st->import_mapping_3to2);
Py_CLEAR(st->codecs_encode);
Py_CLEAR(st->empty_tuple);
}
/* Initialize the given pickle module state. */
@ -321,10 +317,6 @@ _Pickle_InitState(PickleState *st)
}
Py_CLEAR(codecs);
st->empty_tuple = PyTuple_New(0);
if (st->empty_tuple == NULL)
goto error;
return 0;
error:
@ -1137,8 +1129,9 @@ _Unpickler_ReadFromFile(UnpicklerObject *self, Py_ssize_t n)
return -1;
if (n == READ_WHOLE_LINE) {
PickleState *st = _Pickle_GetGlobalState();
data = PyObject_Call(self->readline, st->empty_tuple, NULL);
PyObject *empty_tuple = PyTuple_New(0);
data = PyObject_Call(self->readline, empty_tuple, NULL);
Py_DECREF(empty_tuple);
}
else {
PyObject *len = PyLong_FromSsize_t(n);
@ -3774,8 +3767,10 @@ 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_Call(reduce_func, st->empty_tuple,
PyObject *empty_tuple = PyTuple_New(0);
reduce_value = PyObject_Call(reduce_func, empty_tuple,
NULL);
Py_DECREF(empty_tuple);
}
else {
PyErr_Format(st->PicklingError,
@ -7412,7 +7407,6 @@ pickle_traverse(PyObject *m, visitproc visit, void *arg)
Py_VISIT(st->name_mapping_3to2);
Py_VISIT(st->import_mapping_3to2);
Py_VISIT(st->codecs_encode);
Py_VISIT(st->empty_tuple);
return 0;
}