bpo-42195: Ensure consistency of Callable's __args__ in collections.abc and typing (GH-23060)
diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
index 51a1237..756a7ce 100644
--- a/Objects/genericaliasobject.c
+++ b/Objects/genericaliasobject.c
@@ -429,8 +429,8 @@ ga_getattro(PyObject *self, PyObject *name)
static PyObject *
ga_richcompare(PyObject *a, PyObject *b, int op)
{
- if (!Py_IS_TYPE(a, &Py_GenericAliasType) ||
- !Py_IS_TYPE(b, &Py_GenericAliasType) ||
+ if (!PyObject_TypeCheck(a, &Py_GenericAliasType) ||
+ !PyObject_TypeCheck(b, &Py_GenericAliasType) ||
(op != Py_EQ && op != Py_NE))
{
Py_RETURN_NOTIMPLEMENTED;
@@ -564,6 +564,29 @@ static PyGetSetDef ga_properties[] = {
{0}
};
+/* A helper function to create GenericAlias' args tuple and set its attributes.
+ * Returns 1 on success, 0 on failure.
+ */
+static inline int
+setup_ga(gaobject *alias, PyObject *origin, PyObject *args) {
+ if (!PyTuple_Check(args)) {
+ args = PyTuple_Pack(1, args);
+ if (args == NULL) {
+ return 0;
+ }
+ }
+ else {
+ Py_INCREF(args);
+ }
+
+ Py_INCREF(origin);
+ alias->origin = origin;
+ alias->args = args;
+ alias->parameters = NULL;
+ alias->weakreflist = NULL;
+ return 1;
+}
+
static PyObject *
ga_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
@@ -575,7 +598,15 @@ ga_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
}
PyObject *origin = PyTuple_GET_ITEM(args, 0);
PyObject *arguments = PyTuple_GET_ITEM(args, 1);
- return Py_GenericAlias(origin, arguments);
+ gaobject *self = (gaobject *)type->tp_alloc(type, 0);
+ if (self == NULL) {
+ return NULL;
+ }
+ if (!setup_ga(self, origin, arguments)) {
+ type->tp_free((PyObject *)self);
+ return NULL;
+ }
+ return (PyObject *)self;
}
static PyNumberMethods ga_as_number = {
@@ -600,7 +631,7 @@ PyTypeObject Py_GenericAliasType = {
.tp_hash = ga_hash,
.tp_call = ga_call,
.tp_getattro = ga_getattro,
- .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+ .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE,
.tp_traverse = ga_traverse,
.tp_richcompare = ga_richcompare,
.tp_weaklistoffset = offsetof(gaobject, weakreflist),
@@ -615,27 +646,14 @@ PyTypeObject Py_GenericAliasType = {
PyObject *
Py_GenericAlias(PyObject *origin, PyObject *args)
{
- if (!PyTuple_Check(args)) {
- args = PyTuple_Pack(1, args);
- if (args == NULL) {
- return NULL;
- }
- }
- else {
- Py_INCREF(args);
- }
-
gaobject *alias = PyObject_GC_New(gaobject, &Py_GenericAliasType);
if (alias == NULL) {
- Py_DECREF(args);
return NULL;
}
-
- Py_INCREF(origin);
- alias->origin = origin;
- alias->args = args;
- alias->parameters = NULL;
- alias->weakreflist = NULL;
+ if (!setup_ga(alias, origin, args)) {
+ PyObject_GC_Del((PyObject *)alias);
+ return NULL;
+ }
_PyObject_GC_TRACK(alias);
return (PyObject *)alias;
}