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bpo-42152: Use PyDict_Contains and PyDict_SetDefault if appropriate. (GH-22986) 

If PyDict_GetItemWithError is only used to check whether the key is in dict,
it is better to use PyDict_Contains instead.

And if it is used in combination with PyDict_SetItem, PyDict_SetDefault can
replace the combination.
This commit is contained in:
Serhiy Storchaka 2020-10-26 12:47:57 +02:00 committed by GitHub
parent fb5db7ec58
commit b510e101f8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 137 additions and 165 deletions
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21
Modules/_ctypes/_ctypes.c
View File

@ -492,9 +492,10 @@ StructUnionType_new(PyTypeObject *type, PyObject *args, PyObject *kwds, int isSt
return NULL;
/* keep this for bw compatibility */
if (_PyDict_GetItemIdWithError(result->tp_dict, &PyId__abstract_))
int r = _PyDict_ContainsId(result->tp_dict, &PyId__abstract_);
if (r > 0)
return (PyObject *)result;
if (PyErr_Occurred()) {
if (r < 0) {
Py_DECREF(result);
return NULL;
}
@ -4397,15 +4398,13 @@ _init_pos_args(PyObject *self, PyTypeObject *type,
}
val = PyTuple_GET_ITEM(args, i + index);
if (kwds) {
if (PyDict_GetItemWithError(kwds, name)) {
PyErr_Format(PyExc_TypeError,
"duplicate values for field %R",
name);
Py_DECREF(pair);
Py_DECREF(name);
return -1;
}
else if (PyErr_Occurred()) {
res = PyDict_Contains(kwds, name);
if (res != 0) {
if (res > 0) {
PyErr_Format(PyExc_TypeError,
"duplicate values for field %R",
name);
}
Py_DECREF(pair);
Py_DECREF(name);
return -1;

5
Modules/_ctypes/callbacks.c
View File

@ -109,8 +109,9 @@ TryAddRef(StgDictObject *dict, CDataObject *obj)
IUnknown *punk;
_Py_IDENTIFIER(_needs_com_addref_);
if (!_PyDict_GetItemIdWithError((PyObject *)dict, &PyId__needs_com_addref_)) {
if (PyErr_Occurred()) {
int r = _PyDict_ContainsId((PyObject *)dict, &PyId__needs_com_addref_);
if (r <= 0) {
if (r < 0) {
PrintError("getting _needs_com_addref_");
}
return;

21
Modules/_pickle.c
View File

@ -2004,26 +2004,21 @@ fast_save_enter(PicklerObject *self, PyObject *obj)
self->fast_nesting = -1;
return 0;
}
if (PyDict_GetItemWithError(self->fast_memo, key)) {
Py_DECREF(key);
int r = PyDict_Contains(self->fast_memo, key);
if (r > 0) {
PyErr_Format(PyExc_ValueError,
"fast mode: can't pickle cyclic objects "
"including object type %.200s at %p",
Py_TYPE(obj)->tp_name, obj);
self->fast_nesting = -1;
return 0;
}
if (PyErr_Occurred()) {
Py_DECREF(key);
self->fast_nesting = -1;
return 0;
}
if (PyDict_SetItem(self->fast_memo, key, Py_None) < 0) {
Py_DECREF(key);
self->fast_nesting = -1;
return 0;
else if (r == 0) {
r = PyDict_SetItem(self->fast_memo, key, Py_None);
}
Py_DECREF(key);
if (r != 0) {
self->fast_nesting = -1;
return 0;
}
}
return 1;
}

12
Modules/posixmodule.c
View File

@ -1526,13 +1526,11 @@ convertenviron(void)
Py_DECREF(d);
return NULL;
}
if (PyDict_GetItemWithError(d, k) == NULL) {
if (PyErr_Occurred() || PyDict_SetItem(d, k, v) != 0) {
Py_DECREF(v);
Py_DECREF(k);
Py_DECREF(d);
return NULL;
}
if (PyDict_SetDefault(d, k, v) == NULL) {
Py_DECREF(v);
Py_DECREF(k);
Py_DECREF(d);
return NULL;
}
Py_DECREF(k);
Py_DECREF(v);

10
Modules/pyexpat.c
View File

@ -1614,15 +1614,7 @@ static int init_handler_descrs(void)
if (descr == NULL)
return -1;
if (PyDict_GetItemWithError(Xmlparsetype.tp_dict, PyDescr_NAME(descr))) {
Py_DECREF(descr);
continue;
}
else if (PyErr_Occurred()) {
Py_DECREF(descr);
return -1;
}
if (PyDict_SetItem(Xmlparsetype.tp_dict, PyDescr_NAME(descr), descr) < 0) {
if (PyDict_SetDefault(Xmlparsetype.tp_dict, PyDescr_NAME(descr), descr) == NULL) {
Py_DECREF(descr);
return -1;
}

13
Modules/selectmodule.c
View File

@ -499,11 +499,14 @@ select_poll_modify_impl(pollObject *self, int fd, unsigned short eventmask)
key = PyLong_FromLong(fd);
if (key == NULL)
return NULL;
if (PyDict_GetItemWithError(self->dict, key) == NULL) {
if (!PyErr_Occurred()) {
errno = ENOENT;
PyErr_SetFromErrno(PyExc_OSError);
}
err = PyDict_Contains(self->dict, key);
if (err < 0) {
Py_DECREF(key);
return NULL;
}
if (err == 0) {
errno = ENOENT;
PyErr_SetFromErrno(PyExc_OSError);
Py_DECREF(key);
return NULL;
}

45
Objects/dictobject.c
View File

@ -2544,8 +2544,8 @@ PyDict_MergeFromSeq2(PyObject *d, PyObject *seq2, int override)
goto Fail;
}
}
else if (PyDict_GetItemWithError(d, key) == NULL) {
if (PyErr_Occurred() || PyDict_SetItem(d, key, value) < 0) {
else {
if (PyDict_SetDefault(d, key, value) == NULL) {
Py_DECREF(key);
Py_DECREF(value);
goto Fail;
@ -2660,19 +2660,20 @@ dict_merge(PyObject *a, PyObject *b, int override)
Py_INCREF(value);
if (override == 1)
err = insertdict(mp, key, hash, value);
else if (_PyDict_GetItem_KnownHash(a, key, hash) == NULL) {
if (PyErr_Occurred()) {
Py_DECREF(value);
Py_DECREF(key);
return -1;
else {
err = _PyDict_Contains_KnownHash(a, key, hash);
if (err == 0) {
err = insertdict(mp, key, hash, value);
}
else if (err > 0) {
if (override != 0) {
_PyErr_SetKeyError(key);
Py_DECREF(value);
Py_DECREF(key);
return -1;
}
err = 0;
}
err = insertdict(mp, key, hash, value);
}
else if (override != 0) {
_PyErr_SetKeyError(key);
Py_DECREF(value);
Py_DECREF(key);
return -1;
}
Py_DECREF(value);
Py_DECREF(key);
@ -2709,17 +2710,15 @@ dict_merge(PyObject *a, PyObject *b, int override)
for (key = PyIter_Next(iter); key; key = PyIter_Next(iter)) {
if (override != 1) {
if (PyDict_GetItemWithError(a, key) != NULL) {
if (override != 0) {
status = PyDict_Contains(a, key);
if (status != 0) {
if (status > 0) {
if (override == 0) {
Py_DECREF(key);
continue;
}
_PyErr_SetKeyError(key);
Py_DECREF(key);
Py_DECREF(iter);
return -1;
}
Py_DECREF(key);
continue;
}
else if (PyErr_Occurred()) {
Py_DECREF(key);
Py_DECREF(iter);
return -1;

122
Objects/typeobject.c
View File

@ -2388,7 +2388,7 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
PyHeapTypeObject *et;
PyMemberDef *mp;
Py_ssize_t i, nbases, nslots, slotoffset, name_size;
int j, may_add_dict, may_add_weak, add_dict, add_weak;
int j, r, may_add_dict, may_add_weak, add_dict, add_weak;
_Py_IDENTIFIER(__qualname__);
_Py_IDENTIFIER(__slots__);
_Py_IDENTIFIER(__classcell__);
@ -2542,7 +2542,12 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
goto error;
}
PyList_SET_ITEM(newslots, j, tmp);
if (PyDict_GetItemWithError(dict, tmp)) {
r = PyDict_Contains(dict, tmp);
if (r < 0) {
Py_DECREF(newslots);
goto error;
}
if (r > 0) {
/* CPython inserts __qualname__ and __classcell__ (when needed)
into the namespace when creating a class. They will be deleted
below so won't act as class variables. */
@ -2555,10 +2560,6 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
goto error;
}
}
else if (PyErr_Occurred()) {
Py_DECREF(newslots);
goto error;
}
j++;
}
assert(j == nslots - add_dict - add_weak);
@ -2643,10 +2644,11 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
type->tp_dict = dict;
/* Set __module__ in the dict */
if (_PyDict_GetItemIdWithError(dict, &PyId___module__) == NULL) {
if (PyErr_Occurred()) {
goto error;
}
r = _PyDict_ContainsId(dict, &PyId___module__);
if (r < 0) {
goto error;
}
if (r == 0) {
tmp = PyEval_GetGlobals();
if (tmp != NULL) {
tmp = _PyDict_GetItemIdWithError(tmp, &PyId___name__);
@ -2885,6 +2887,7 @@ PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
PyHeapTypeObject *res;
PyObject *modname;
PyTypeObject *type, *base;
int r;
const PyType_Slot *slot;
Py_ssize_t nmembers, weaklistoffset, dictoffset, vectorcalloffset;
@ -3052,9 +3055,9 @@ PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
PyObject *__doc__ = PyUnicode_FromString(_PyType_DocWithoutSignature(type->tp_name, type->tp_doc));
if (!__doc__)
goto fail;
int ret = _PyDict_SetItemId(type->tp_dict, &PyId___doc__, __doc__);
r = _PyDict_SetItemId(type->tp_dict, &PyId___doc__, __doc__);
Py_DECREF(__doc__);
if (ret < 0)
if (r < 0)
goto fail;
}
@ -3070,21 +3073,21 @@ PyType_FromModuleAndSpec(PyObject *module, PyType_Spec *spec, PyObject *bases)
}
/* Set type.__module__ */
if (_PyDict_GetItemIdWithError(type->tp_dict, &PyId___module__) == NULL) {
if (PyErr_Occurred()) {
goto fail;
}
r = _PyDict_ContainsId(type->tp_dict, &PyId___module__);
if (r < 0) {
goto fail;
}
if (r == 0) {
s = strrchr(spec->name, '.');
if (s != NULL) {
int err;
modname = PyUnicode_FromStringAndSize(
spec->name, (Py_ssize_t)(s - spec->name));
if (modname == NULL) {
goto fail;
}
err = _PyDict_SetItemId(type->tp_dict, &PyId___module__, modname);
r = _PyDict_SetItemId(type->tp_dict, &PyId___module__, modname);
Py_DECREF(modname);
if (err != 0)
if (r != 0)
goto fail;
} else {
if (PyErr_WarnFormat(PyExc_DeprecationWarning, 1,
@ -5035,26 +5038,16 @@ add_methods(PyTypeObject *type, PyMethodDef *meth)
}
if (!(meth->ml_flags & METH_COEXIST)) {
if (PyDict_GetItemWithError(dict, name)) {
if (!isdescr) {
Py_DECREF(name);
}
Py_DECREF(descr);
continue;
}
else if (PyErr_Occurred()) {
if (!isdescr) {
Py_DECREF(name);
}
return -1;
}
err = PyDict_SetDefault(dict, name, descr) == NULL;
}
else {
err = PyDict_SetItem(dict, name, descr) < 0;
}
err = PyDict_SetItem(dict, name, descr);
if (!isdescr) {
Py_DECREF(name);
}
Py_DECREF(descr);
if (err < 0)
if (err)
return -1;
}
return 0;
@ -5070,15 +5063,7 @@ add_members(PyTypeObject *type, PyMemberDef *memb)
if (descr == NULL)
return -1;
if (PyDict_GetItemWithError(dict, PyDescr_NAME(descr))) {
Py_DECREF(descr);
continue;
}
else if (PyErr_Occurred()) {
Py_DECREF(descr);
return -1;
}
if (PyDict_SetItem(dict, PyDescr_NAME(descr), descr) < 0) {
if (PyDict_SetDefault(dict, PyDescr_NAME(descr), descr) == NULL) {
Py_DECREF(descr);
return -1;
}
@ -5097,15 +5082,7 @@ add_getset(PyTypeObject *type, PyGetSetDef *gsp)
if (descr == NULL)
return -1;
if (PyDict_GetItemWithError(dict, PyDescr_NAME(descr))) {
Py_DECREF(descr);
continue;
}
else if (PyErr_Occurred()) {
Py_DECREF(descr);
return -1;
}
if (PyDict_SetItem(dict, PyDescr_NAME(descr), descr) < 0) {
if (PyDict_SetDefault(dict, PyDescr_NAME(descr), descr) == NULL) {
Py_DECREF(descr);
return -1;
}
@ -5553,10 +5530,11 @@ PyType_Ready(PyTypeObject *type)
/* if the type dictionary doesn't contain a __doc__, set it from
the tp_doc slot.
*/
if (_PyDict_GetItemIdWithError(type->tp_dict, &PyId___doc__) == NULL) {
if (PyErr_Occurred()) {
goto error;
}
int r = _PyDict_ContainsId(type->tp_dict, &PyId___doc__);
if (r < 0) {
goto error;
}
if (r == 0) {
if (type->tp_doc != NULL) {
const char *old_doc = _PyType_DocWithoutSignature(type->tp_name,
type->tp_doc);
@ -5582,10 +5560,12 @@ PyType_Ready(PyTypeObject *type)
This signals that __hash__ is not inherited.
*/
if (type->tp_hash == NULL) {
if (_PyDict_GetItemIdWithError(type->tp_dict, &PyId___hash__) == NULL) {
if (PyErr_Occurred() ||
_PyDict_SetItemId(type->tp_dict, &PyId___hash__, Py_None) < 0)
{
r = _PyDict_ContainsId(type->tp_dict, &PyId___hash__);
if (r < 0) {
goto error;
}
if (r == 0) {
if (_PyDict_SetItemId(type->tp_dict, &PyId___hash__, Py_None) < 0) {
goto error;
}
type->tp_hash = PyObject_HashNotImplemented;
@ -6270,19 +6250,17 @@ add_tp_new_wrapper(PyTypeObject *type)
{
PyObject *func;
if (_PyDict_GetItemIdWithError(type->tp_dict, &PyId___new__) != NULL)
int r = _PyDict_ContainsId(type->tp_dict, &PyId___new__);
if (r > 0)
return 0;
if (PyErr_Occurred())
if (r < 0)
return -1;
func = PyCFunction_NewEx(tp_new_methoddef, (PyObject *)type, NULL);
if (func == NULL)
return -1;
if (_PyDict_SetItemId(type->tp_dict, &PyId___new__, func)) {
Py_DECREF(func);
return -1;
}
r = _PyDict_SetItemId(type->tp_dict, &PyId___new__, func);
Py_DECREF(func);
return 0;
return r;
}
/* Slot wrappers that call the corresponding __foo__ slot. See comments
@ -7795,10 +7773,11 @@ recurse_down_subclasses(PyTypeObject *type, PyObject *name,
/* Avoid recursing down into unaffected classes */
dict = subclass->tp_dict;
if (dict != NULL && PyDict_Check(dict)) {
if (PyDict_GetItemWithError(dict, name) != NULL) {
int r = PyDict_Contains(dict, name);
if (r > 0) {
continue;
}
if (PyErr_Occurred()) {
if (r < 0) {
return -1;
}
}
@ -7853,9 +7832,10 @@ add_operators(PyTypeObject *type)
ptr = slotptr(type, p->offset);
if (!ptr || !*ptr)
continue;
if (PyDict_GetItemWithError(dict, p->name_strobj))
int r = PyDict_Contains(dict, p->name_strobj);
if (r > 0)
continue;
if (PyErr_Occurred()) {
if (r < 0) {
return -1;
}
if (*ptr == (void *)PyObject_HashNotImplemented) {

20
Python/bltinmodule.c
View File

@ -924,12 +924,12 @@ builtin_eval_impl(PyObject *module, PyObject *source, PyObject *globals,
return NULL;
}
if (_PyDict_GetItemIdWithError(globals, &PyId___builtins__) == NULL) {
if (_PyDict_SetItemId(globals, &PyId___builtins__,
PyEval_GetBuiltins()) != 0)
return NULL;
int r = _PyDict_ContainsId(globals, &PyId___builtins__);
if (r == 0) {
r = _PyDict_SetItemId(globals, &PyId___builtins__,
PyEval_GetBuiltins());
}
else if (PyErr_Occurred()) {
if (r < 0) {
return NULL;
}
@ -1012,12 +1012,12 @@ builtin_exec_impl(PyObject *module, PyObject *source, PyObject *globals,
Py_TYPE(locals)->tp_name);
return NULL;
}
if (_PyDict_GetItemIdWithError(globals, &PyId___builtins__) == NULL) {
if (_PyDict_SetItemId(globals, &PyId___builtins__,
PyEval_GetBuiltins()) != 0)
return NULL;
int r = _PyDict_ContainsId(globals, &PyId___builtins__);
if (r == 0) {
r = _PyDict_SetItemId(globals, &PyId___builtins__,
PyEval_GetBuiltins());
}
else if (PyErr_Occurred()) {
if (r < 0) {
return NULL;
}

9
Python/errors.c
View File

@ -1098,10 +1098,11 @@ PyErr_NewException(const char *name, PyObject *base, PyObject *dict)
goto failure;
}
if (_PyDict_GetItemIdWithError(dict, &PyId___module__) == NULL) {
if (_PyErr_Occurred(tstate)) {
goto failure;
}
int r = _PyDict_ContainsId(dict, &PyId___module__);
if (r < 0) {
goto failure;
}
if (r == 0) {
modulename = PyUnicode_FromStringAndSize(name,
(Py_ssize_t)(dot-name));
if (modulename == NULL)

24
Python/import.c
View File

@ -1018,14 +1018,14 @@ module_dict_for_exec(PyThreadState *tstate, PyObject *name)
/* If the module is being reloaded, we get the old module back
and re-use its dict to exec the new code. */
d = PyModule_GetDict(m);
if (_PyDict_GetItemIdWithError(d, &PyId___builtins__) == NULL) {
if (_PyErr_Occurred(tstate) ||
_PyDict_SetItemId(d, &PyId___builtins__,
PyEval_GetBuiltins()) != 0)
{
remove_module(tstate, name);
return NULL;
}
int r = _PyDict_ContainsId(d, &PyId___builtins__);
if (r == 0) {
r = _PyDict_SetItemId(d, &PyId___builtins__,
PyEval_GetBuiltins());
}
if (r < 0) {
remove_module(tstate, name);
return NULL;
}
return d; /* Return a borrowed reference. */
@ -1660,10 +1660,14 @@ resolve_name(PyThreadState *tstate, PyObject *name, PyObject *globals, int level
goto error;
}
if (_PyDict_GetItemIdWithError(globals, &PyId___path__) == NULL) {
int haspath = _PyDict_ContainsId(globals, &PyId___path__);
if (haspath < 0) {
goto error;
}
if (!haspath) {
Py_ssize_t dot;
if (_PyErr_Occurred(tstate) || PyUnicode_READY(package) < 0) {
if (PyUnicode_READY(package) < 0) {
goto error;
}