Add METH_FASTCALL calling convention
Issue #27810: Add a new calling convention for C functions:
PyObject* func(PyObject *self, PyObject **args,
Py_ssize_t nargs, PyObject *kwnames);
Where args is a C array of positional arguments followed by values of keyword
arguments. nargs is the number of positional arguments, kwnames are keys of
keyword arguments. kwnames can be NULL.
diff --git a/Objects/methodobject.c b/Objects/methodobject.c
index 0fe3315..487ccd7 100644
--- a/Objects/methodobject.c
+++ b/Objects/methodobject.c
@@ -97,6 +97,11 @@
if (flags == (METH_VARARGS | METH_KEYWORDS)) {
res = (*(PyCFunctionWithKeywords)meth)(self, args, kwds);
}
+ else if (flags == METH_FASTCALL) {
+ PyObject **stack = &PyTuple_GET_ITEM(args, 0);
+ Py_ssize_t nargs = PyTuple_GET_SIZE(args);
+ res = _PyCFunction_FastCallDict(func, stack, nargs, kwds);
+ }
else {
if (kwds != NULL && PyDict_Size(kwds) != 0) {
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
@@ -232,6 +237,25 @@
break;
}
+ case METH_FASTCALL:
+ {
+ PyObject **stack;
+ PyObject *kwnames;
+ _PyCFunctionFast fastmeth = (_PyCFunctionFast)meth;
+
+ stack = _PyStack_UnpackDict(args, nargs, kwargs, &kwnames, func_obj);
+ if (stack == NULL) {
+ return NULL;
+ }
+
+ result = (*fastmeth) (self, stack, nargs, kwnames);
+ if (stack != args) {
+ PyMem_Free(stack);
+ }
+ Py_XDECREF(kwnames);
+ break;
+ }
+
default:
PyErr_SetString(PyExc_SystemError,
"Bad call flags in PyCFunction_Call. "