gh-111666: Speed up `BaseExceptionGroup.{derive,split,subgroup}` (#111667)

2 files changed, 9 insertions, 20 deletions

diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-11-03-01-23-48.gh-issue-111666.l8Q8G5.rst b/Misc/NEWS.d/next/Core and Builtins/2023-11-03-01-23-48.gh-issue-111666.l8Q8G5.rst
new file mode 100644
index 0000000..1d742a7
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2023-11-03-01-23-48.gh-issue-111666.l8Q8G5.rst
@@ -0,0 +1,3 @@
+Speed up :meth:`BaseExceptionGroup.derive`,
+:meth:`BaseExceptionGroup.subgroup`, and :meth:`BaseExceptionGroup.split` by
+changing how they parse passed arguments.
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index e3e8e02..a685ed8 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -876,13 +876,9 @@ BaseExceptionGroup_str(PyBaseExceptionGroupObject *self)
 }
 
 static PyObject *
-BaseExceptionGroup_derive(PyObject *self_, PyObject *args)
+BaseExceptionGroup_derive(PyObject *self_, PyObject *excs)
 {
     PyBaseExceptionGroupObject *self = _PyBaseExceptionGroupObject_cast(self_);
-    PyObject *excs = NULL;
-    if (!PyArg_ParseTuple(args, "O", &excs)) {
-        return NULL;
-    }
     PyObject *init_args = PyTuple_Pack(2, self->msg, excs);
     if (!init_args) {
         return NULL;
@@ -1176,13 +1172,8 @@ done:
 }
 
 static PyObject *
-BaseExceptionGroup_split(PyObject *self, PyObject *args)
+BaseExceptionGroup_split(PyObject *self, PyObject *matcher_value)
 {
-    PyObject *matcher_value = NULL;
-    if (!PyArg_UnpackTuple(args, "split", 1, 1, &matcher_value)) {
-        return NULL;
-    }
-
     _exceptiongroup_split_matcher_type matcher_type;
     if (get_matcher_type(matcher_value, &matcher_type) < 0) {
         return NULL;
@@ -1207,13 +1198,8 @@ BaseExceptionGroup_split(PyObject *self, PyObject *args)
 }
 
 static PyObject *
-BaseExceptionGroup_subgroup(PyObject *self, PyObject *args)
+BaseExceptionGroup_subgroup(PyObject *self, PyObject *matcher_value)
 {
-    PyObject *matcher_value = NULL;
-    if (!PyArg_UnpackTuple(args, "subgroup", 1, 1, &matcher_value)) {
-        return NULL;
-    }
-
     _exceptiongroup_split_matcher_type matcher_type;
     if (get_matcher_type(matcher_value, &matcher_type) < 0) {
         return NULL;
@@ -1488,9 +1474,9 @@ static PyMemberDef BaseExceptionGroup_members[] = {
 static PyMethodDef BaseExceptionGroup_methods[] = {
     {"__class_getitem__", (PyCFunction)Py_GenericAlias,
       METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
-    {"derive", (PyCFunction)BaseExceptionGroup_derive, METH_VARARGS},
-    {"split", (PyCFunction)BaseExceptionGroup_split, METH_VARARGS},
-    {"subgroup", (PyCFunction)BaseExceptionGroup_subgroup, METH_VARARGS},
+    {"derive", (PyCFunction)BaseExceptionGroup_derive, METH_O},
+    {"split", (PyCFunction)BaseExceptionGroup_split, METH_O},
+    {"subgroup", (PyCFunction)BaseExceptionGroup_subgroup, METH_O},
     {NULL}
 };