gh-90928: Statically Initialize the Keywords Tuple in Clinic-Generated Code (gh-95860)

We only statically initialize for core code and builtin modules.  Extension modules still create
the tuple at runtime.  We'll solve that part of interpreter isolation separately.

This change includes generated code. The non-generated changes are in:

* Tools/clinic/clinic.py
* Python/getargs.c
* Include/cpython/modsupport.h
* Makefile.pre.in (re-generate global strings after running clinic)
* very minor tweaks to Modules/_codecsmodule.c and Python/Python-tokenize.c

All other changes are generated code (clinic, global strings).

1 files changed, 41 insertions, 2 deletions

diff --git a/Objects/clinic/funcobject.c.h b/Objects/clinic/funcobject.c.h
index 17fb13f..4580b3b 100644
--- a/Objects/clinic/funcobject.c.h
+++ b/Objects/clinic/funcobject.c.h
@@ -2,6 +2,12 @@
 preserve
 [clinic start generated code]*/
 
+#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+#  include "pycore_gc.h"            // PyGC_Head
+#  include "pycore_runtime.h"       // _Py_ID()
+#endif
+
+
 PyDoc_STRVAR(func_new__doc__,
 "function(code, globals, name=None, argdefs=None, closure=None)\n"
 "--\n"
@@ -27,8 +33,41 @@ static PyObject *
 func_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 {
     PyObject *return_value = NULL;
+    #define NUM_KEYWORDS 5
+    #if NUM_KEYWORDS == 0
+
+    #  if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+    #    define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
+    #  else
+    #    define KWTUPLE NULL
+    #  endif
+
+    #else  // NUM_KEYWORDS != 0
+    #  if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(code), &_Py_ID(globals), &_Py_ID(name), &_Py_ID(argdefs), &_Py_ID(closure), },
+    };
+    #  define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #  else  // !Py_BUILD_CORE
+    #    define KWTUPLE NULL
+    #  endif  // !Py_BUILD_CORE
+    #endif  // NUM_KEYWORDS != 0
+    #undef NUM_KEYWORDS
+
     static const char * const _keywords[] = {"code", "globals", "name", "argdefs", "closure", NULL};
-    static _PyArg_Parser _parser = {NULL, _keywords, "function", 0};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "function",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
     PyObject *argsbuf[5];
     PyObject * const *fastargs;
     Py_ssize_t nargs = PyTuple_GET_SIZE(args);
@@ -75,4 +114,4 @@ skip_optional_pos:
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=3d96afa3396e5c82 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d1e30fc268fadb6f input=a9049054013a1b77]*/