bpo-36974: implement PEP 590 (GH-13185)

Co-authored-by: Jeroen Demeyer <J.Demeyer@UGent.be>
Co-authored-by: Mark Shannon <mark@hotpy.org>

Modules/_asynciomodule.c

@@ -367,8 +367,7 @@ call_soon(PyObject *loop, PyObject *func, PyObject *arg, PyObject *ctx)
         }
         stack[nargs] = (PyObject *)ctx;
 
-        handle = _PyObject_FastCallKeywords(
-            callable, stack, nargs, context_kwname);
+        handle = _PyObject_Vectorcall(callable, stack, nargs, context_kwname);
         Py_DECREF(callable);
     }
 
@@ -2805,8 +2804,7 @@ set_exception:
         PyObject *stack[2];
         stack[0] = wrapper;
         stack[1] = (PyObject *)task->task_context;
-        res = _PyObject_FastCallKeywords(
-            add_cb, stack, 1, context_kwname);
+        res = _PyObject_Vectorcall(add_cb, stack, 1, context_kwname);
         Py_DECREF(add_cb);
         Py_DECREF(wrapper);
         if (res == NULL) {

Modules/_testcapimodule.c

@@ -4713,7 +4713,7 @@ test_pyobject_fastcalldict(PyObject *self, PyObject *args)
 
 
 static PyObject *
-test_pyobject_fastcallkeywords(PyObject *self, PyObject *args)
+test_pyobject_vectorcall(PyObject *self, PyObject *args)
 {
     PyObject *func, *func_args, *kwnames = NULL;
     PyObject **stack;
@@ -4742,7 +4742,31 @@ test_pyobject_fastcallkeywords(PyObject *self, PyObject *args)
         PyErr_SetString(PyExc_TypeError, "kwnames must be None or a tuple");
         return NULL;
     }
-    return _PyObject_FastCallKeywords(func, stack, nargs, kwnames);
+    return _PyObject_Vectorcall(func, stack, nargs, kwnames);
+}
+
+
+static PyObject *
+test_pyvectorcall_call(PyObject *self, PyObject *args)
+{
+    PyObject *func;
+    PyObject *argstuple;
+    PyObject *kwargs = NULL;
+
+    if (!PyArg_ParseTuple(args, "OO|O", &func, &argstuple, &kwargs)) {
+        return NULL;
+    }
+
+    if (!PyTuple_Check(argstuple)) {
+        PyErr_SetString(PyExc_TypeError, "args must be a tuple");
+        return NULL;
+    }
+    if (kwargs != NULL && !PyDict_Check(kwargs)) {
+        PyErr_SetString(PyExc_TypeError, "kwargs must be a dict");
+        return NULL;
+    }
+
+    return PyVectorcall_Call(func, argstuple, kwargs);
 }
 
 
@@ -5230,7 +5254,8 @@ static PyMethodDef TestMethods[] = {
     {"raise_SIGINT_then_send_None", raise_SIGINT_then_send_None, METH_VARARGS},
     {"pyobject_fastcall", test_pyobject_fastcall, METH_VARARGS},
     {"pyobject_fastcalldict", test_pyobject_fastcalldict, METH_VARARGS},
-    {"pyobject_fastcallkeywords", test_pyobject_fastcallkeywords, METH_VARARGS},
+    {"pyobject_vectorcall", test_pyobject_vectorcall, METH_VARARGS},
+    {"pyvectorcall_call", test_pyvectorcall_call, METH_VARARGS},
     {"stack_pointer", stack_pointer, METH_NOARGS},
 #ifdef W_STOPCODE
     {"W_STOPCODE", py_w_stopcode, METH_VARARGS},