gh-91320: Use _PyCFunction_CAST() (#92251)

Replace "(PyCFunction)(void(*)(void))func" cast with
_PyCFunction_CAST(func).

Change generated by the command:

sed -i -e \
  's!(PyCFunction)(void(\*)(void)) *\([A-Za-z0-9_]\+\)!_PyCFunction_CAST(\1)!g' \
  $(find -name "*.c")

Objects/descrobject.c

@@ -1145,7 +1145,7 @@ mappingproxy_reversed(mappingproxyobject *pp, PyObject *Py_UNUSED(ignored))
             to the underlying mapping */
 
 static PyMethodDef mappingproxy_methods[] = {
-    {"get",       (PyCFunction)(void(*)(void))mappingproxy_get, METH_FASTCALL,
+    {"get",       _PyCFunction_CAST(mappingproxy_get), METH_FASTCALL,
      PyDoc_STR("D.get(k[,d]) -> D[k] if k in D, else d."
                "  d defaults to None.")},
     {"keys",      (PyCFunction)mappingproxy_keys,       METH_NOARGS,

Objects/dictobject.c

@@ -3655,9 +3655,9 @@ PyDoc_STRVAR(values__doc__,
 
 static PyMethodDef mapp_methods[] = {
     DICT___CONTAINS___METHODDEF
-    {"__getitem__", (PyCFunction)(void(*)(void))dict_subscript,        METH_O | METH_COEXIST,
+    {"__getitem__", _PyCFunction_CAST(dict_subscript),        METH_O | METH_COEXIST,
      getitem__doc__},
-    {"__sizeof__",      (PyCFunction)(void(*)(void))dict_sizeof,       METH_NOARGS,
+    {"__sizeof__",      _PyCFunction_CAST(dict_sizeof),       METH_NOARGS,
      sizeof__doc__},
     DICT_GET_METHODDEF
     DICT_SETDEFAULT_METHODDEF
@@ -3669,7 +3669,7 @@ static PyMethodDef mapp_methods[] = {
     items__doc__},
     {"values",          dictvalues_new,                 METH_NOARGS,
     values__doc__},
-    {"update",          (PyCFunction)(void(*)(void))dict_update, METH_VARARGS | METH_KEYWORDS,
+    {"update",          _PyCFunction_CAST(dict_update), METH_VARARGS | METH_KEYWORDS,
      update__doc__},
     DICT_FROMKEYS_METHODDEF
     {"clear",           (PyCFunction)dict_clear,        METH_NOARGS,
@@ -4026,9 +4026,9 @@ dictiter_reduce(dictiterobject *di, PyObject *Py_UNUSED(ignored));
 PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
 
 static PyMethodDef dictiter_methods[] = {
-    {"__length_hint__", (PyCFunction)(void(*)(void))dictiter_len, METH_NOARGS,
+    {"__length_hint__", _PyCFunction_CAST(dictiter_len), METH_NOARGS,
      length_hint_doc},
-     {"__reduce__", (PyCFunction)(void(*)(void))dictiter_reduce, METH_NOARGS,
+     {"__reduce__", _PyCFunction_CAST(dictiter_reduce), METH_NOARGS,
      reduce_doc},
     {NULL,              NULL}           /* sentinel */
 };
@@ -5079,7 +5079,7 @@ PyDoc_STRVAR(reversed_keys_doc,
 static PyMethodDef dictkeys_methods[] = {
     {"isdisjoint",      (PyCFunction)dictviews_isdisjoint,  METH_O,
      isdisjoint_doc},
-    {"__reversed__",    (PyCFunction)(void(*)(void))dictkeys_reversed,    METH_NOARGS,
+    {"__reversed__",    _PyCFunction_CAST(dictkeys_reversed),    METH_NOARGS,
      reversed_keys_doc},
     {NULL,              NULL}           /* sentinel */
 };

Objects/genobject.c

@@ -821,7 +821,7 @@ PyDoc_STRVAR(sizeof__doc__,
 
 static PyMethodDef gen_methods[] = {
     {"send",(PyCFunction)gen_send, METH_O, send_doc},
-    {"throw",(PyCFunction)(void(*)(void))gen_throw, METH_FASTCALL, throw_doc},
+    {"throw",_PyCFunction_CAST(gen_throw), METH_FASTCALL, throw_doc},
     {"close",(PyCFunction)gen_close, METH_NOARGS, close_doc},
     {"__sizeof__", (PyCFunction)gen_sizeof, METH_NOARGS, sizeof__doc__},
     {NULL, NULL}        /* Sentinel */
@@ -1169,7 +1169,7 @@ PyDoc_STRVAR(coro_close_doc,
 
 static PyMethodDef coro_methods[] = {
     {"send",(PyCFunction)gen_send, METH_O, coro_send_doc},
-    {"throw",(PyCFunction)(void(*)(void))gen_throw, METH_FASTCALL, coro_throw_doc},
+    {"throw",_PyCFunction_CAST(gen_throw), METH_FASTCALL, coro_throw_doc},
     {"close",(PyCFunction)gen_close, METH_NOARGS, coro_close_doc},
     {"__sizeof__", (PyCFunction)gen_sizeof, METH_NOARGS, sizeof__doc__},
     {NULL, NULL}        /* Sentinel */
@@ -1276,7 +1276,7 @@ coro_wrapper_traverse(PyCoroWrapper *cw, visitproc visit, void *arg)
 
 static PyMethodDef coro_wrapper_methods[] = {
     {"send",(PyCFunction)coro_wrapper_send, METH_O, coro_send_doc},
-    {"throw",(PyCFunction)(void(*)(void))coro_wrapper_throw,
+    {"throw",_PyCFunction_CAST(coro_wrapper_throw),
     METH_FASTCALL, coro_throw_doc},
     {"close",(PyCFunction)coro_wrapper_close, METH_NOARGS, coro_close_doc},
     {NULL, NULL}        /* Sentinel */
@@ -1831,7 +1831,7 @@ async_gen_asend_close(PyAsyncGenASend *o, PyObject *args)
 
 static PyMethodDef async_gen_asend_methods[] = {
     {"send", (PyCFunction)async_gen_asend_send, METH_O, send_doc},
-    {"throw", (PyCFunction)(void(*)(void))async_gen_asend_throw, METH_FASTCALL, throw_doc},
+    {"throw", _PyCFunction_CAST(async_gen_asend_throw), METH_FASTCALL, throw_doc},
     {"close", (PyCFunction)async_gen_asend_close, METH_NOARGS, close_doc},
     {NULL, NULL}        /* Sentinel */
 };
@@ -2248,7 +2248,7 @@ async_gen_athrow_close(PyAsyncGenAThrow *o, PyObject *args)
 
 static PyMethodDef async_gen_athrow_methods[] = {
     {"send", (PyCFunction)async_gen_athrow_send, METH_O, send_doc},
-    {"throw", (PyCFunction)(void(*)(void))async_gen_athrow_throw,
+    {"throw", _PyCFunction_CAST(async_gen_athrow_throw),
     METH_FASTCALL, throw_doc},
     {"close", (PyCFunction)async_gen_athrow_close, METH_NOARGS, close_doc},
     {NULL, NULL}        /* Sentinel */

Objects/odictobject.c

@@ -1317,7 +1317,7 @@ static PyMethodDef odict_methods[] = {
      odict_values__doc__},
     {"items",           odictitems_new,                 METH_NOARGS,
      odict_items__doc__},
-    {"update",          (PyCFunction)(void(*)(void))odict_update, METH_VARARGS | METH_KEYWORDS,
+    {"update",          _PyCFunction_CAST(odict_update), METH_VARARGS | METH_KEYWORDS,
      odict_update__doc__},
     {"clear",           (PyCFunction)odict_clear,       METH_NOARGS,
      odict_clear__doc__},

Objects/typeobject.c

@@ -4289,7 +4289,7 @@ type___sizeof___impl(PyTypeObject *self)
 static PyMethodDef type_methods[] = {
     TYPE_MRO_METHODDEF
     TYPE___SUBCLASSES___METHODDEF
-    {"__prepare__", (PyCFunction)(void(*)(void))type_prepare,
+    {"__prepare__", _PyCFunction_CAST(type_prepare),
      METH_FASTCALL | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("__prepare__() -> dict\n"
                "used to create the namespace for the class statement")},
@@ -7141,7 +7141,7 @@ tp_new_wrapper(PyObject *self, PyObject *args, PyObject *kwds)
 }
 
 static struct PyMethodDef tp_new_methoddef[] = {
-    {"__new__", (PyCFunction)(void(*)(void))tp_new_wrapper, METH_VARARGS|METH_KEYWORDS,
+    {"__new__", _PyCFunction_CAST(tp_new_wrapper), METH_VARARGS|METH_KEYWORDS,
      PyDoc_STR("__new__($type, *args, **kwargs)\n--\n\n"
                "Create and return a new object.  "
                "See help(type) for accurate signature.")},
@@ -8390,7 +8390,7 @@ update_one_slot(PyTypeObject *type, slotdef *p)
         }
         else if (Py_IS_TYPE(descr, &PyCFunction_Type) &&
                  PyCFunction_GET_FUNCTION(descr) ==
-                 (PyCFunction)(void(*)(void))tp_new_wrapper &&
+                 _PyCFunction_CAST(tp_new_wrapper) &&
                  ptr == (void**)&type->tp_new)
         {
             /* The __new__ wrapper is not a wrapper descriptor,

Objects/unicodeobject.c

@@ -14214,7 +14214,7 @@ static PyMethodDef unicode_methods[] = {
     UNICODE_ISIDENTIFIER_METHODDEF
     UNICODE_ISPRINTABLE_METHODDEF
     UNICODE_ZFILL_METHODDEF
-    {"format", (PyCFunction)(void(*)(void)) do_string_format, METH_VARARGS | METH_KEYWORDS, format__doc__},
+    {"format", _PyCFunction_CAST(do_string_format), METH_VARARGS | METH_KEYWORDS, format__doc__},
     {"format_map", (PyCFunction) do_string_format_map, METH_O, format_map__doc__},
     UNICODE___FORMAT___METHODDEF
     UNICODE_MAKETRANS_METHODDEF