Issue #27830: Revert, remove _PyFunction_FastCallKeywords()

Include/abstract.h

@@ -292,23 +292,6 @@ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
 #define _PyObject_CallArg1(func, arg) \
     _PyObject_FastCall((func), &(arg), 1)
 
-     /* Call the callable object func with the "fast call" calling convention:
-        args is a C array for positional arguments followed by (key, value)
-        pairs for keyword arguments.
-
-        nargs is the number of positional parameters at the beginning of stack.
-        nkwargs is the number of (key, value) pairs at the end of stack.
-
-        If nargs and nkwargs are equal to zero, stack can be NULL.
-
-        Return the result on success. Raise an exception and return NULL on
-        error. */
-     PyAPI_FUNC(PyObject *) _PyObject_FastCallKeywords(
-                                PyObject *func,
-                                PyObject **stack,
-                                Py_ssize_t nargs,
-                                Py_ssize_t nkwargs);
-
     PyAPI_FUNC(PyObject *) _PyObject_Call_Prepend(PyObject *func,
                                                   PyObject *obj, PyObject *args,
                                                   PyObject *kwargs);

Include/funcobject.h

@@ -64,12 +64,6 @@ PyAPI_FUNC(PyObject *) _PyFunction_FastCallDict(
     PyObject **args,
     Py_ssize_t nargs,
     PyObject *kwargs);
-
-PyAPI_FUNC(PyObject *) _PyFunction_FastCallKeywords(
-    PyObject *func,
-    PyObject **stack,
-    Py_ssize_t nargs,
-    Py_ssize_t nkwargs);
 #endif
 
 /* Macros for direct access to these values. Type checks are *not*

Objects/abstract.c

@@ -2343,51 +2343,6 @@ _PyStack_AsDict(PyObject **stack, Py_ssize_t nkwargs, PyObject *func)
     return kwdict;
 }
 
-PyObject *
-_PyObject_FastCallKeywords(PyObject *func, PyObject **stack, Py_ssize_t nargs,
-                           Py_ssize_t nkwargs)
-{
-    PyObject *args, *kwdict, *result;
-
-    /* _PyObject_FastCallKeywords() must not be called with an exception set,
-       because it may clear it (directly or indirectly) and so the
-       caller loses its exception */
-    assert(!PyErr_Occurred());
-
-    assert(func != NULL);
-    assert(nargs >= 0);
-    assert(nkwargs >= 0);
-    assert((nargs == 0 && nkwargs == 0) || stack != NULL);
-
-    if (PyFunction_Check(func)) {
-        /* Fast-path: avoid temporary tuple or dict */
-        return _PyFunction_FastCallKeywords(func, stack, nargs, nkwargs);
-    }
-
-    if (PyCFunction_Check(func) && nkwargs == 0) {
-        return _PyCFunction_FastCallDict(func, stack, nargs, NULL);
-    }
-
-    /* Slow-path: build temporary tuple and/or dict */
-    args = _PyStack_AsTuple(stack, nargs);
-
-    if (nkwargs > 0) {
-        kwdict = _PyStack_AsDict(stack + nargs, nkwargs, func);
-        if (kwdict == NULL) {
-            Py_DECREF(args);
-            return NULL;
-        }
-    }
-    else {
-        kwdict = NULL;
-    }
-
-    result = PyObject_Call(func, args, kwdict);
-    Py_DECREF(args);
-    Py_XDECREF(kwdict);
-    return result;
-}
-
 /* Positional arguments are obj followed args. */
 PyObject *
 _PyObject_Call_Prepend(PyObject *func,

Python/ceval.c

@@ -113,6 +113,7 @@ static PyObject * call_function(PyObject ***, int, uint64*, uint64*);
 #else
 static PyObject * call_function(PyObject ***, int);
 #endif
+static PyObject * fast_function(PyObject *, PyObject **, Py_ssize_t, Py_ssize_t);
 static PyObject * do_call(PyObject *, PyObject ***, Py_ssize_t, Py_ssize_t);
 static PyObject * ext_do_call(PyObject *, PyObject ***, int, Py_ssize_t, Py_ssize_t);
 static PyObject * update_keyword_args(PyObject *, Py_ssize_t, PyObject ***,
@@ -4766,7 +4767,7 @@ call_function(PyObject ***pp_stack, int oparg
         }
         READ_TIMESTAMP(*pintr0);
         if (PyFunction_Check(func)) {
-            x = _PyFunction_FastCallKeywords(func, (*pp_stack) - n, nargs, nkwargs);
+            x = fast_function(func, (*pp_stack) - n, nargs, nkwargs);
         }
         else {
             x = do_call(func, pp_stack, nargs, nkwargs);
@@ -4779,7 +4780,7 @@ call_function(PyObject ***pp_stack, int oparg
 
     /* Clear the stack of the function object.  Also removes
        the arguments in case they weren't consumed already
-       (_PyFunction_FastCallKeywords() and err_args() leave them on the stack).
+       (fast_function() and err_args() leave them on the stack).
      */
     while ((*pp_stack) > pfunc) {
         w = EXT_POP(*pp_stack);
@@ -4791,7 +4792,7 @@ call_function(PyObject ***pp_stack, int oparg
     return x;
 }
 
-/* The _PyFunction_FastCallKeywords() function optimize calls for which no argument
+/* The fast_function() function optimize calls for which no argument
    tuple is necessary; the objects are passed directly from the stack.
    For the simplest case -- a function that takes only positional
    arguments and is called with only positional arguments -- it
@@ -4839,9 +4840,8 @@ _PyFunction_FastCallNoKw(PyCodeObject *co, PyObject **args, Py_ssize_t nargs,
 
 /* Similar to _PyFunction_FastCall() but keywords are passed a (key, value)
    pairs in stack */
-PyObject *
+static PyObject *
-_PyFunction_FastCallKeywords(PyObject *func, PyObject **stack,
+fast_function(PyObject *func, PyObject **stack, Py_ssize_t nargs, Py_ssize_t nkwargs)
-                             Py_ssize_t nargs, Py_ssize_t nkwargs)
 {
     PyCodeObject *co = (PyCodeObject *)PyFunction_GET_CODE(func);
     PyObject *globals = PyFunction_GET_GLOBALS(func);