mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-10-17 20:28:43 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 9

bpo-32571: Avoid raising unneeded AttributeError and silencing it in C code (GH-5222)

Browse source 
Add two new private APIs: _PyObject_LookupAttr() and _PyObject_LookupAttrId()
This commit is contained in:
Serhiy Storchaka 2018-01-25 10:49:40 +02:00 • committed by INADA Naoki
parent 2b822a0bb1
commit f320be77ff
22 changed files with 1455 additions and 1442 deletions
Download patch file Download diff file Expand all files Collapse all files

50
Objects/abstract.c
View file

@ -171,16 +171,14 @@ PyObject_GetItem(PyObject *o, PyObject *key)
if (PyType_Check(o)) {
PyObject *meth, *result, *stack[1] = {key};
_Py_IDENTIFIER(__class_getitem__);
meth = _PyObject_GetAttrId(o, &PyId___class_getitem__);
if (_PyObject_LookupAttrId(o, &PyId___class_getitem__, &meth) < 0) {
return NULL;
}
if (meth) {
result = _PyObject_FastCall(meth, stack, 1);
Py_DECREF(meth);
return result;
}
else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
return NULL;
}
PyErr_Clear();
}
return type_error("'%.200s' object is not subscriptable", o);
@ -2268,14 +2266,9 @@ abstract_get_bases(PyObject *cls)
PyObject *bases;
Py_ALLOW_RECURSION
bases = _PyObject_GetAttrId(cls, &PyId___bases__);
(void)_PyObject_LookupAttrId(cls, &PyId___bases__, &bases);
Py_END_ALLOW_RECURSION
if (bases == NULL) {
if (PyErr_ExceptionMatches(PyExc_AttributeError))
PyErr_Clear();
return NULL;
}
if (!PyTuple_Check(bases)) {
if (bases != NULL && !PyTuple_Check(bases)) {
Py_DECREF(bases);
return NULL;
}
@ -2338,26 +2331,23 @@ static int
recursive_isinstance(PyObject *inst, PyObject *cls)
{
PyObject *icls;
int retval = 0;
int retval;
_Py_IDENTIFIER(__class__);
if (PyType_Check(cls)) {
retval = PyObject_TypeCheck(inst, (PyTypeObject *)cls);
if (retval == 0) {
PyObject *c = _PyObject_GetAttrId(inst, &PyId___class__);
if (c == NULL) {
if (PyErr_ExceptionMatches(PyExc_AttributeError))
PyErr_Clear();
else
retval = -1;
}
else {
if (c != (PyObject *)(inst->ob_type) &&
PyType_Check(c))
retval = _PyObject_LookupAttrId(inst, &PyId___class__, &icls);
if (icls != NULL) {
if (icls != (PyObject *)(inst->ob_type) && PyType_Check(icls)) {
retval = PyType_IsSubtype(
(PyTypeObject *)c,
(PyTypeObject *)icls,
(PyTypeObject *)cls);
Py_DECREF(c);
}
else {
retval = 0;
}
Py_DECREF(icls);
}
}
}
@ -2365,14 +2355,8 @@ recursive_isinstance(PyObject *inst, PyObject *cls)
if (!check_class(cls,
"isinstance() arg 2 must be a type or tuple of types"))
return -1;
icls = _PyObject_GetAttrId(inst, &PyId___class__);
if (icls == NULL) {
if (PyErr_ExceptionMatches(PyExc_AttributeError))
PyErr_Clear();
else
retval = -1;
}
else {
retval = _PyObject_LookupAttrId(inst, &PyId___class__, &icls);
if (icls != NULL) {
retval = abstract_issubclass(icls, cls);
Py_DECREF(icls);
}

30
Objects/classobject.c
View file

@ -246,21 +246,14 @@ method_repr(PyMethodObject *a)
{
PyObject *self = a->im_self;
PyObject *func = a->im_func;
PyObject *funcname = NULL, *result = NULL;
PyObject *funcname, *result;
const char *defname = "?";
funcname = _PyObject_GetAttrId(func, &PyId___qualname__);
if (funcname == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return NULL;
PyErr_Clear();
funcname = _PyObject_GetAttrId(func, &PyId___name__);
if (funcname == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return NULL;
PyErr_Clear();
}
if (_PyObject_LookupAttrId(func, &PyId___qualname__, &funcname) < 0 ||
(funcname == NULL &&
_PyObject_LookupAttrId(func, &PyId___name__, &funcname) < 0))
{
return NULL;
}
if (funcname != NULL && !PyUnicode_Check(funcname)) {
@ -542,7 +535,7 @@ static PyObject *
instancemethod_repr(PyObject *self)
{
PyObject *func = PyInstanceMethod_Function(self);
PyObject *funcname = NULL , *result = NULL;
PyObject *funcname, *result;
const char *defname = "?";
if (func == NULL) {
@ -550,13 +543,10 @@ instancemethod_repr(PyObject *self)
return NULL;
}
funcname = _PyObject_GetAttrId(func, &PyId___name__);
if (funcname == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return NULL;
PyErr_Clear();
if (_PyObject_LookupAttrId(func, &PyId___name__, &funcname) < 0) {
return NULL;
}
else if (!PyUnicode_Check(funcname)) {
if (funcname != NULL && !PyUnicode_Check(funcname)) {
Py_DECREF(funcname);
funcname = NULL;
}

13
Objects/dictobject.c
View file

@ -2234,17 +2234,16 @@ dict_update_common(PyObject *self, PyObject *args, PyObject *kwds,
}
else if (arg != NULL) {
_Py_IDENTIFIER(keys);
PyObject *func = _PyObject_GetAttrId(arg, &PyId_keys);
if (func != NULL) {
PyObject *func;
if (_PyObject_LookupAttrId(arg, &PyId_keys, &func) < 0) {
result = -1;
}
else if (func != NULL) {
Py_DECREF(func);
result = PyDict_Merge(self, arg, 1);
}
else if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
result = PyDict_MergeFromSeq2(self, arg, 1);
}
else {
result = -1;
result = PyDict_MergeFromSeq2(self, arg, 1);
}
}

21
Objects/genobject.c
View file

@ -352,13 +352,11 @@ gen_close_iter(PyObject *yf)
return -1;
}
else {
PyObject *meth = _PyObject_GetAttrId(yf, &PyId_close);
if (meth == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
PyErr_WriteUnraisable(yf);
PyErr_Clear();
PyObject *meth;
if (_PyObject_LookupAttrId(yf, &PyId_close, &meth) < 0) {
PyErr_WriteUnraisable(yf);
}
else {
if (meth) {
retval = _PyObject_CallNoArg(meth);
Py_DECREF(meth);
if (retval == NULL)
@ -471,13 +469,12 @@ _gen_throw(PyGenObject *gen, int close_on_genexit,
gen->gi_running = 0;
} else {
/* `yf` is an iterator or a coroutine-like object. */
PyObject *meth = _PyObject_GetAttrId(yf, &PyId_throw);
PyObject *meth;
if (_PyObject_LookupAttrId(yf, &PyId_throw, &meth) < 0) {
Py_DECREF(yf);
return NULL;
}
if (meth == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
Py_DECREF(yf);
return NULL;
}
PyErr_Clear();
Py_DECREF(yf);
goto throw_here;
}

76
Objects/object.c
View file

@ -817,16 +817,11 @@ _PyObject_IsAbstract(PyObject *obj)
if (obj == NULL)
return 0;
isabstract = _PyObject_GetAttrId(obj, &PyId___isabstractmethod__);
if (isabstract == NULL) {
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
return 0;
}
return -1;
res = _PyObject_LookupAttrId(obj, &PyId___isabstractmethod__, &isabstract);
if (res > 0) {
res = PyObject_IsTrue(isabstract);
Py_DECREF(isabstract);
}
res = PyObject_IsTrue(isabstract);
Py_DECREF(isabstract);
return res;
}
@ -888,47 +883,74 @@ PyObject_GetAttr(PyObject *v, PyObject *name)
return NULL;
}
PyObject *
_PyObject_GetAttrWithoutError(PyObject *v, PyObject *name)
int
_PyObject_LookupAttr(PyObject *v, PyObject *name, PyObject **result)
{
PyTypeObject *tp = Py_TYPE(v);
PyObject *ret = NULL;
if (!PyUnicode_Check(name)) {
PyErr_Format(PyExc_TypeError,
"attribute name must be string, not '%.200s'",
name->ob_type->tp_name);
return NULL;
*result = NULL;
return -1;
}
if (tp->tp_getattro == PyObject_GenericGetAttr) {
return _PyObject_GenericGetAttrWithDict(v, name, NULL, 1);
*result = _PyObject_GenericGetAttrWithDict(v, name, NULL, 1);
if (*result != NULL) {
return 1;
}
if (PyErr_Occurred()) {
return -1;
}
return 0;
}
if (tp->tp_getattro != NULL) {
ret = (*tp->tp_getattro)(v, name);
*result = (*tp->tp_getattro)(v, name);
}
else if (tp->tp_getattr != NULL) {
const char *name_str = PyUnicode_AsUTF8(name);
if (name_str == NULL)
return NULL;
ret = (*tp->tp_getattr)(v, (char *)name_str);
if (name_str == NULL) {
*result = NULL;
return -1;
}
*result = (*tp->tp_getattr)(v, (char *)name_str);
}
if (ret == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
if (*result != NULL) {
return 1;
}
return ret;
if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
return -1;
}
PyErr_Clear();
return 0;
}
int
_PyObject_LookupAttrId(PyObject *v, _Py_Identifier *name, PyObject **result)
{
PyObject *oname = _PyUnicode_FromId(name); /* borrowed */
if (!oname) {
*result = NULL;
return -1;
}
return _PyObject_LookupAttr(v, oname, result);
}
int
PyObject_HasAttr(PyObject *v, PyObject *name)
{
PyObject *res = _PyObject_GetAttrWithoutError(v, name);
if (res != NULL) {
Py_DECREF(res);
return 1;
PyObject *res;
if (_PyObject_LookupAttr(v, name, &res) < 0) {
PyErr_Clear();
return 0;
}
PyErr_Clear();
return 0;
if (res == NULL) {
return 0;
}
Py_DECREF(res);
return 1;
}
int

20
Objects/odictobject.c
View file

@ -2359,7 +2359,10 @@ mutablemapping_update(PyObject *self, PyObject *args, PyObject *kwargs)
goto handle_kwargs;
}
func = _PyObject_GetAttrId(other, &PyId_keys);
if (_PyObject_LookupAttrId(other, &PyId_keys, &func) < 0) {
Py_DECREF(other);
return NULL;
}
if (func != NULL) {
PyObject *keys, *iterator, *key;
keys = _PyObject_CallNoArg(func);
@ -2391,15 +2394,11 @@ mutablemapping_update(PyObject *self, PyObject *args, PyObject *kwargs)
return NULL;
goto handle_kwargs;
}
else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
if (_PyObject_LookupAttrId(other, &PyId_items, &func) < 0) {
Py_DECREF(other);
return NULL;
}
else {
PyErr_Clear();
}
func = _PyObject_GetAttrId(other, &PyId_items);
if (func != NULL) {
PyObject *items;
Py_DECREF(other);
@ -2413,13 +2412,6 @@ mutablemapping_update(PyObject *self, PyObject *args, PyObject *kwargs)
return NULL;
goto handle_kwargs;
}
else if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
Py_DECREF(other);
return NULL;
}
else {
PyErr_Clear();
}
res = mutablemapping_add_pairs(self, other);
Py_DECREF(other);

27
Objects/typeobject.c
View file

@ -2403,7 +2403,9 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
if (PyType_Check(tmp)) {
continue;
}
tmp = _PyObject_GetAttrId(tmp, &PyId___mro_entries__);
if (_PyObject_LookupAttrId(tmp, &PyId___mro_entries__, &tmp) < 0) {
return NULL;
}
if (tmp != NULL) {
PyErr_SetString(PyExc_TypeError,
"type() doesn't support MRO entry resolution; "
@ -2411,12 +2413,6 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
Py_DECREF(tmp);
return NULL;
}
else if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
}
else {
return NULL;
}
}
/* Search the bases for the proper metatype to deal with this: */
winner = _PyType_CalculateMetaclass(metatype, bases);
@ -4099,15 +4095,12 @@ _PyObject_GetState(PyObject *obj, int required)
PyObject *getstate;
_Py_IDENTIFIER(__getstate__);
getstate = _PyObject_GetAttrId(obj, &PyId___getstate__);
if (_PyObject_LookupAttrId(obj, &PyId___getstate__, &getstate) < 0) {
return NULL;
}
if (getstate == NULL) {
PyObject *slotnames;
if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
return NULL;
}
PyErr_Clear();
if (required && obj->ob_type->tp_itemsize) {
PyErr_Format(PyExc_TypeError,
"can't pickle %.200s objects",
@ -4174,14 +4167,12 @@ _PyObject_GetState(PyObject *obj, int required)
name = PyList_GET_ITEM(slotnames, i);
Py_INCREF(name);
value = PyObject_GetAttr(obj, name);
if (_PyObject_LookupAttr(obj, name, &value) < 0) {
goto error;
}
if (value == NULL) {
Py_DECREF(name);
if (!PyErr_ExceptionMatches(PyExc_AttributeError)) {
goto error;
}
/* It is not an error if the attribute is not present. */
PyErr_Clear();
}
else {
int err = PyDict_SetItem(slots, name, value);