bpo-35582: Argument Clinic: Optimize the "all boring objects" case. (GH-11520)

Use _PyArg_CheckPositional() and inlined code instead of
PyArg_UnpackTuple() and _PyArg_UnpackStack() if all parameters
are positional and use the "object" converter.

1 files changed, 14 insertions, 7 deletions

diff --git a/Python/clinic/context.c.h b/Python/clinic/context.c.h
index 32b1883ebe..bbe19db1bd 100644
--- a/Python/clinic/context.c.h
+++ b/Python/clinic/context.c.h
@@ -25,11 +25,15 @@ _contextvars_Context_get(PyContext *self, PyObject *const *args, Py_ssize_t narg
     PyObject *key;
     PyObject *default_value = Py_None;
 
-    if (!_PyArg_UnpackStack(args, nargs, "get",
-        1, 2,
-        &key, &default_value)) {
+    if (!_PyArg_CheckPositional("get", nargs, 1, 2)) {
         goto exit;
     }
+    key = args[0];
+    if (nargs < 2) {
+        goto skip_optional;
+    }
+    default_value = args[1];
+skip_optional:
     return_value = _contextvars_Context_get_impl(self, key, default_value);
 
 exit:
@@ -134,11 +138,14 @@ _contextvars_ContextVar_get(PyContextVar *self, PyObject *const *args, Py_ssize_
     PyObject *return_value = NULL;
     PyObject *default_value = NULL;
 
-    if (!_PyArg_UnpackStack(args, nargs, "get",
-        0, 1,
-        &default_value)) {
+    if (!_PyArg_CheckPositional("get", nargs, 0, 1)) {
         goto exit;
     }
+    if (nargs < 1) {
+        goto skip_optional;
+    }
+    default_value = args[0];
+skip_optional:
     return_value = _contextvars_ContextVar_get_impl(self, default_value);
 
 exit:
@@ -170,4 +177,4 @@ PyDoc_STRVAR(_contextvars_ContextVar_reset__doc__,
 
 #define _CONTEXTVARS_CONTEXTVAR_RESET_METHODDEF    \
     {"reset", (PyCFunction)_contextvars_ContextVar_reset, METH_O, _contextvars_ContextVar_reset__doc__},
-/*[clinic end generated code: output=9c93e22bcadbaa2b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=67c3a8f76b6cf4e7 input=a9049054013a1b77]*/