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bpo-34573: Simplify __reduce__() of set and dict iterators. (GH-9050)

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Simplify the pickling of set and dictionary objects iterators by consuming
the iterator into a list with PySequence_List.
This commit is contained in:
Sergey Fedoseev 2018-10-20 05:43:33 +05:00 committed by Pablo Galindo
parent 027664a3d5
commit 6395844e6a
2 changed files with 7 additions and 59 deletions
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38
Objects/dictobject.c
View File

@ -3663,44 +3663,14 @@ PyTypeObject PyDictIterItem_Type = {
static PyObject *
dictiter_reduce(dictiterobject *di, PyObject *Py_UNUSED(ignored))
{
PyObject *list;
dictiterobject tmp;
list = PyList_New(0);
if (!list)
return NULL;
/* copy the itertor state */
tmp = *di;
/* copy the iterator state */
dictiterobject tmp = *di;
Py_XINCREF(tmp.di_dict);
/* iterate the temporary into a list */
for(;;) {
PyObject *element = 0;
if (Py_TYPE(di) == &PyDictIterItem_Type)
element = dictiter_iternextitem(&tmp);
else if (Py_TYPE(di) == &PyDictIterKey_Type)
element = dictiter_iternextkey(&tmp);
else if (Py_TYPE(di) == &PyDictIterValue_Type)
element = dictiter_iternextvalue(&tmp);
else
Py_UNREACHABLE();
if (element) {
if (PyList_Append(list, element)) {
Py_DECREF(element);
Py_DECREF(list);
Py_XDECREF(tmp.di_dict);
return NULL;
}
Py_DECREF(element);
} else
break;
}
PyObject *list = PySequence_List((PyObject*)&tmp);
Py_XDECREF(tmp.di_dict);
/* check for error */
if (tmp.di_dict != NULL) {
/* we have an error */
Py_DECREF(list);
if (list == NULL) {
return NULL;
}
return Py_BuildValue("N(N)", _PyObject_GetBuiltin("iter"), list);

28
Objects/setobject.c
View File

@ -843,36 +843,14 @@ static PyObject *setiter_iternext(setiterobject *si);
static PyObject *
setiter_reduce(setiterobject *si, PyObject *Py_UNUSED(ignored))
{
PyObject *list;
setiterobject tmp;
list = PyList_New(0);
if (!list)
return NULL;
/* copy the iterator state */
tmp = *si;
setiterobject tmp = *si;
Py_XINCREF(tmp.si_set);
/* iterate the temporary into a list */
for(;;) {
PyObject *element = setiter_iternext(&tmp);
if (element) {
if (PyList_Append(list, element)) {
Py_DECREF(element);
Py_DECREF(list);
Py_XDECREF(tmp.si_set);
return NULL;
}
Py_DECREF(element);
} else
break;
}
PyObject *list = PySequence_List((PyObject*)&tmp);
Py_XDECREF(tmp.si_set);
/* check for error */
if (tmp.si_set != NULL) {
/* we have an error */
Py_DECREF(list);
if (list == NULL) {
return NULL;
}
return Py_BuildValue("N(N)", _PyObject_GetBuiltin("iter"), list);