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, 19 insertions, 10 deletions

diff --git a/Modules/cjkcodecs/clinic/multibytecodec.c.h b/Modules/cjkcodecs/clinic/multibytecodec.c.h
index 871bf33..c62a641 100644
--- a/Modules/cjkcodecs/clinic/multibytecodec.c.h
+++ b/Modules/cjkcodecs/clinic/multibytecodec.c.h
@@ -296,11 +296,14 @@ _multibytecodec_MultibyteStreamReader_read(MultibyteStreamReaderObject *self, Py
     PyObject *return_value = NULL;
     PyObject *sizeobj = Py_None;
 
-    if (!_PyArg_UnpackStack(args, nargs, "read",
-        0, 1,
-        &sizeobj)) {
+    if (!_PyArg_CheckPositional("read", nargs, 0, 1)) {
         goto exit;
     }
+    if (nargs < 1) {
+        goto skip_optional;
+    }
+    sizeobj = args[0];
+skip_optional:
     return_value = _multibytecodec_MultibyteStreamReader_read_impl(self, sizeobj);
 
 exit:
@@ -325,11 +328,14 @@ _multibytecodec_MultibyteStreamReader_readline(MultibyteStreamReaderObject *self
     PyObject *return_value = NULL;
     PyObject *sizeobj = Py_None;
 
-    if (!_PyArg_UnpackStack(args, nargs, "readline",
-        0, 1,
-        &sizeobj)) {
+    if (!_PyArg_CheckPositional("readline", nargs, 0, 1)) {
         goto exit;
     }
+    if (nargs < 1) {
+        goto skip_optional;
+    }
+    sizeobj = args[0];
+skip_optional:
     return_value = _multibytecodec_MultibyteStreamReader_readline_impl(self, sizeobj);
 
 exit:
@@ -354,11 +360,14 @@ _multibytecodec_MultibyteStreamReader_readlines(MultibyteStreamReaderObject *sel
     PyObject *return_value = NULL;
     PyObject *sizehintobj = Py_None;
 
-    if (!_PyArg_UnpackStack(args, nargs, "readlines",
-        0, 1,
-        &sizehintobj)) {
+    if (!_PyArg_CheckPositional("readlines", nargs, 0, 1)) {
         goto exit;
     }
+    if (nargs < 1) {
+        goto skip_optional;
+    }
+    sizehintobj = args[0];
+skip_optional:
     return_value = _multibytecodec_MultibyteStreamReader_readlines_impl(self, sizehintobj);
 
 exit:
@@ -422,4 +431,4 @@ PyDoc_STRVAR(_multibytecodec___create_codec__doc__,
 
 #define _MULTIBYTECODEC___CREATE_CODEC_METHODDEF    \
     {"__create_codec", (PyCFunction)_multibytecodec___create_codec, METH_O, _multibytecodec___create_codec__doc__},
-/*[clinic end generated code: output=2ed7030b28a79029 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=bcd6311010557faf input=a9049054013a1b77]*/