//     Copyright 2016, Kay Hayen, mailto:kay.hayen@gmail.com
//
//     Part of "Nuitka", an optimizing Python compiler that is compatible and
//     integrates with CPython, but also works on its own.
//
//     Licensed under the Apache License, Version 2.0 (the "License");
//     you may not use this file except in compliance with the License.
//     You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//     Unless required by applicable law or agreed to in writing, software
//     distributed under the License is distributed on an "AS IS" BASIS,
//     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//     See the License for the specific language governing permissions and
//     limitations under the License.
//

#include "nuitka/prelude.h"

#include "nuitka/compiled_method.h"

// Needed for offsetof
#include <stddef.h>

#define NUITKA_FUNCTION_FREE_LIST 1
#define MAX_FUNCTION_FREE_LIST_COUNT 100


// tp_descr_get slot, bind a function to an object.
static PyObject *Nuitka_Function_descr_get( PyObject *function, PyObject *object, PyObject *klass )
{
    assert( Nuitka_Function_Check( function ) );

#if PYTHON_VERSION >= 300
    if ( object == NULL || object == Py_None )
    {
        return INCREASE_REFCOUNT( function );
    }
#endif

    return Nuitka_Method_New(
        (struct Nuitka_FunctionObject *)function,
        object == Py_None ? NULL : object,
        klass
    );
}

 // tp_repr slot, decide how compiled function shall be output to "repr" built-in
static PyObject *Nuitka_Function_tp_repr( struct Nuitka_FunctionObject *function )
{
#if PYTHON_VERSION < 300
    return PyString_FromFormat(
#else
    return PyUnicode_FromFormat(
#endif
        "<compiled_function %s at %p>",
#if PYTHON_VERSION < 330
        Nuitka_String_AsString( function->m_name ),
#else
        Nuitka_String_AsString( function->m_qualname ),
#endif
        function
    );
}

static PyObject *Nuitka_Function_tp_call( struct Nuitka_FunctionObject *function, PyObject *tuple_args, PyObject *kw )
{
    CHECK_OBJECT( tuple_args );
    assert( PyTuple_CheckExact( tuple_args ) );

    if ( kw == NULL )
    {
        PyObject **args = &PyTuple_GET_ITEM( tuple_args, 0 );
        Py_ssize_t args_size = PyTuple_GET_SIZE( tuple_args );

        if ( function->m_args_simple && args_size == function->m_args_positional_count )
        {
            for( Py_ssize_t i = 0; i < args_size; i++ )
            {
                Py_INCREF( args[ i ] );
            }

            return function->m_c_code( function, args );
        }
        else if ( function->m_args_simple && args_size + function->m_defaults_given == function->m_args_positional_count )
        {
#ifdef _MSC_VER
            PyObject **python_pars = (PyObject **)_alloca( sizeof( PyObject * ) * function->m_args_overall_count );
#else
            PyObject *python_pars[ function->m_args_overall_count ];
#endif
            memcpy( python_pars, args, args_size * sizeof(PyObject *) );
            memcpy( python_pars + args_size, &PyTuple_GET_ITEM( function->m_defaults, 0 ), function->m_defaults_given * sizeof(PyObject *) );

            for( Py_ssize_t i = 0; i < function->m_args_overall_count; i++ )
            {
                Py_INCREF( python_pars[ i ] );
            }

            return function->m_c_code( function, python_pars );
        }
        else
        {
#ifdef _MSC_VER
            PyObject **python_pars = (PyObject **)_alloca( sizeof( PyObject * ) * function->m_args_overall_count );
#else
            PyObject *python_pars[ function->m_args_overall_count ];
#endif
            memset( python_pars, 0, function->m_args_overall_count * sizeof(PyObject *) );

            if ( parseArgumentsPos( function, python_pars, args, args_size ))
            {
                return function->m_c_code( function, python_pars );
            }
            else
            {
                return NULL;
            }
        }
    }
    else
    {
        return Nuitka_CallFunctionPosArgsKwArgs( function, &PyTuple_GET_ITEM( tuple_args, 0 ), PyTuple_GET_SIZE( tuple_args ), kw );
    }
}

static long Nuitka_Function_tp_traverse( struct Nuitka_FunctionObject *function, visitproc visit, void *arg )
{
    // TODO: Identify the impact of not visiting other owned objects. It appears
    // to be mostly harmless, as these are strings.
    Py_VISIT( function->m_dict );

    for( Py_ssize_t i = 0; i < function->m_closure_given; i++ )
    {
        Py_VISIT( function->m_closure[i] );
    }

    return 0;
}

static long Nuitka_Function_tp_hash( struct Nuitka_FunctionObject *function )
{
    return function->m_counter;
}

static PyObject *Nuitka_Function_get_name( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( object->m_name );
}

static int Nuitka_Function_set_name( struct Nuitka_FunctionObject *object, PyObject *value )
{
#if PYTHON_VERSION < 300
    if (unlikely( value == NULL || PyString_Check( value ) == 0 ))
#else
    if (unlikely( value == NULL || PyUnicode_Check( value ) == 0 ))
#endif
    {
        PyErr_Format( PyExc_TypeError, "__name__ must be set to a string object" );
        return -1;
    }

    PyObject *old = object->m_name;
    object->m_name = INCREASE_REFCOUNT( value );
    Py_DECREF( old );

    return 0;
}

#if PYTHON_VERSION >= 330
static PyObject *Nuitka_Function_get_qualname( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( object->m_qualname );
}

static int Nuitka_Function_set_qualname( struct Nuitka_FunctionObject *object, PyObject *value )
{
    if (unlikely( value == NULL || PyUnicode_Check( value ) == 0 ))
    {
        PyErr_Format( PyExc_TypeError, "__qualname__ must be set to a string object" );
        return -1;
    }

    PyObject *old = object->m_qualname;
    object->m_qualname = INCREASE_REFCOUNT( value );
    Py_DECREF( old );

    return 0;
}
#endif

static PyObject *Nuitka_Function_get_doc( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( object->m_doc );
}

static int Nuitka_Function_set_doc( struct Nuitka_FunctionObject *object, PyObject *value )
{
    PyObject *old = object->m_doc;

    if ( value == NULL )
    {
        value = Py_None;
    }

    object->m_doc = value;
    Py_INCREF( value );

    Py_DECREF( old );

    return 0;
}

static PyObject *Nuitka_Function_get_dict( struct Nuitka_FunctionObject *object )
{
    if ( object->m_dict == NULL )
    {
        object->m_dict = PyDict_New();
    }

    return INCREASE_REFCOUNT( object->m_dict );
}

static int Nuitka_Function_set_dict( struct Nuitka_FunctionObject *object, PyObject *value )
{
    if (unlikely( value == NULL ))
    {
        PyErr_Format( PyExc_TypeError, "function's dictionary may not be deleted");
        return -1;
    }

    if (likely( PyDict_Check( value ) ))
    {
        PyObject *old = object->m_dict;
        object->m_dict = INCREASE_REFCOUNT( value );
        Py_XDECREF( old );

        return 0;
    }
    else
    {
        PyErr_SetString( PyExc_TypeError, "setting function's dictionary to a non-dict" );
        return -1;
    }
}

static PyObject *Nuitka_Function_get_code( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( (PyObject *)object->m_code_object );
}

static int Nuitka_Function_set_code( struct Nuitka_FunctionObject *object, PyObject *value )
{
    PyErr_Format( PyExc_RuntimeError, "__code__ is not writable in Nuitka" );
    return -1;
}

static PyObject *Nuitka_Function_get_closure( struct Nuitka_FunctionObject *object )
{
    if ( object->m_closure_given > 0 )
    {
        PyObject *result = PyTuple_New( object->m_closure_given );

        for( Py_ssize_t i = 0; i < object->m_closure_given; i++ )
        {
            PyTuple_SET_ITEM( result, i, (PyObject *)object->m_closure[i] );
            Py_INCREF( (PyObject *)object->m_closure[i] );
        }

        return result;
    }
    else
    {
        Py_INCREF( Py_None );
        return Py_None;
    }
}


static int Nuitka_Function_set_closure( struct Nuitka_FunctionObject *object, PyObject *value )
{
    PyErr_Format(
#if PYTHON_VERSION < 300
        PyExc_TypeError,
#else
        PyExc_AttributeError,
#endif
        "readonly attribute"
    );

    return -1;
}


static PyObject *Nuitka_Function_get_defaults( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( (PyObject *)object->m_defaults );
}

static void onUpdatedDefaultsValue( struct Nuitka_FunctionObject *function )
{
    if ( function->m_defaults == Py_None )
    {
        function->m_defaults_given = 0;
    }
    else
    {
        function->m_defaults_given = PyTuple_GET_SIZE( function->m_defaults );
    }
}

static int Nuitka_Function_set_defaults( struct Nuitka_FunctionObject *object, PyObject *value )
{
    if ( value == NULL )
    {
        value = Py_None;
    }

    if (unlikely( value != Py_None && PyTuple_Check( value ) == false ))
    {
        PyErr_Format( PyExc_TypeError, "__defaults__ must be set to a tuple object" );
        return -1;
    }

    if ( object->m_defaults == Py_None && value != Py_None )
    {
        PyErr_Format( PyExc_TypeError, "Nuitka doesn't support __defaults__ size changes" );
        return -1;
    }

    if ( object->m_defaults != Py_None && ( value == Py_None || PyTuple_Size( object->m_defaults ) != PyTuple_Size( value ) ) )
    {
        PyErr_Format( PyExc_TypeError, "Nuitka doesn't support __defaults__ size changes" );
        return -1;
    }

    PyObject *old = object->m_defaults;
    object->m_defaults = INCREASE_REFCOUNT( value );
    Py_DECREF( old );

    onUpdatedDefaultsValue( object );

    return 0;
}

#if PYTHON_VERSION >= 300
static PyObject *Nuitka_Function_get_kwdefaults( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( (PyObject *)object->m_kwdefaults );
}

static int Nuitka_Function_set_kwdefaults( struct Nuitka_FunctionObject *object, PyObject *value )
{
    if ( value == NULL )
    {
        value = Py_None;
    }

    if (unlikely( value != Py_None && PyDict_Check( value ) == false ))
    {
        PyErr_Format( PyExc_TypeError, "__kwdefaults__ must be set to a dict object" );
        return -1;
    }

    PyObject *old = object->m_kwdefaults;
    object->m_kwdefaults = INCREASE_REFCOUNT( value );
    Py_DECREF( old );

    return 0;
}
static PyObject *Nuitka_Function_get_annotations( struct Nuitka_FunctionObject *object )
{
    return INCREASE_REFCOUNT( (PyObject *)object->m_annotations );
}

static int Nuitka_Function_set_annotations( struct Nuitka_FunctionObject *object, PyObject *value )
{
    // CPython silently converts None to empty dictionary.
    if ( value == Py_None || value == NULL )
    {
        value = PyDict_New();
    }

    if (unlikely( PyDict_Check( value ) == false ))
    {
        PyErr_Format( PyExc_TypeError, "__annotations__ must be set to a dict object" );
        return -1;
    }

    PyObject *old = object->m_annotations;
    object->m_annotations = INCREASE_REFCOUNT( value );
    Py_XDECREF( old );

    return 0;
}

#endif

static int Nuitka_Function_set_globals( struct Nuitka_FunctionObject *function, PyObject *value )
{
    PyErr_Format( PyExc_TypeError, "readonly attribute" );
    return -1;
}

static PyObject *Nuitka_Function_get_globals( struct Nuitka_FunctionObject *function )
{
    return INCREASE_REFCOUNT( PyModule_GetDict( function->m_module ) );
}

extern PyObject *const_str_plain___module__;

static int Nuitka_Function_set_module( struct Nuitka_FunctionObject *object, PyObject *value )
{
    if ( object->m_dict == NULL )
    {
       object->m_dict = PyDict_New();
    }

    if ( value == NULL )
    {
        value = Py_None;
    }

    return PyDict_SetItem( object->m_dict, const_str_plain___module__, value );
}

static PyObject *Nuitka_Function_get_module( struct Nuitka_FunctionObject *object )
{
    if ( object->m_dict )
    {
        PyObject *result = PyDict_GetItem( object->m_dict, const_str_plain___module__ );

        if ( result != NULL )
        {
            return INCREASE_REFCOUNT( result );
        }
    }

    return INCREASE_REFCOUNT( MODULE_NAME( object->m_module ) );
}


static PyGetSetDef Nuitka_Function_getset[] =
{
#if PYTHON_VERSION >= 330
   { (char *)"__qualname__",    (getter)Nuitka_Function_get_qualname,    (setter)Nuitka_Function_set_qualname, NULL },
#endif
#if PYTHON_VERSION < 300
   { (char *)"func_name",       (getter)Nuitka_Function_get_name,        (setter)Nuitka_Function_set_name, NULL },
#endif
   { (char *)"__name__" ,       (getter)Nuitka_Function_get_name,        (setter)Nuitka_Function_set_name, NULL },
#if PYTHON_VERSION < 300
   { (char *)"func_doc",        (getter)Nuitka_Function_get_doc,         (setter)Nuitka_Function_set_doc, NULL },
#endif
   { (char *)"__doc__" ,        (getter)Nuitka_Function_get_doc,         (setter)Nuitka_Function_set_doc, NULL },
#if PYTHON_VERSION < 300
   { (char *)"func_dict",       (getter)Nuitka_Function_get_dict,        (setter)Nuitka_Function_set_dict, NULL },
#endif
   { (char *)"__dict__",        (getter)Nuitka_Function_get_dict,        (setter)Nuitka_Function_set_dict, NULL },
#if PYTHON_VERSION < 300
   { (char *)"func_code",       (getter)Nuitka_Function_get_code,        (setter)Nuitka_Function_set_code, NULL },
#endif
   { (char *)"__code__",        (getter)Nuitka_Function_get_code,        (setter)Nuitka_Function_set_code, NULL },
#if PYTHON_VERSION < 300
   { (char *)"func_defaults",   (getter)Nuitka_Function_get_defaults,    (setter)Nuitka_Function_set_defaults, NULL },
#endif
   { (char *)"__defaults__",    (getter)Nuitka_Function_get_defaults,    (setter)Nuitka_Function_set_defaults, NULL },
#if PYTHON_VERSION < 300
   { (char *)"func_globals",    (getter)Nuitka_Function_get_globals,     (setter)Nuitka_Function_set_globals, NULL },
#endif
   { (char *)"__closure__",     (getter)Nuitka_Function_get_closure,     (setter)Nuitka_Function_set_closure, NULL },
#if PYTHON_VERSION < 300
   { (char *)"func_closure",    (getter)Nuitka_Function_get_closure,     (setter)Nuitka_Function_set_closure, NULL },
#endif
   { (char *)"__globals__",     (getter)Nuitka_Function_get_globals,     (setter)Nuitka_Function_set_globals, NULL },
   { (char *)"__module__",      (getter)Nuitka_Function_get_module,      (setter)Nuitka_Function_set_module, NULL },
#if PYTHON_VERSION >= 300
   { (char *)"__kwdefaults__",  (getter)Nuitka_Function_get_kwdefaults,  (setter)Nuitka_Function_set_kwdefaults, NULL },
   { (char *)"__annotations__", (getter)Nuitka_Function_get_annotations, (setter)Nuitka_Function_set_annotations, NULL },

#endif
   { NULL }
};

static PyObject *Nuitka_Function_reduce( struct Nuitka_FunctionObject *function )
{
#if PYTHON_VERSION < 330
    return INCREASE_REFCOUNT( function->m_name );
#else
    return INCREASE_REFCOUNT( function->m_qualname );
#endif
}

#if NUITKA_FUNCTION_FREE_LIST
static struct Nuitka_FunctionObject *free_list = NULL;
static int free_list_count = 0;
#endif

static void Nuitka_Function_tp_dealloc( struct Nuitka_FunctionObject *function )
{
#ifndef __NUITKA_NO_ASSERT__
    // Save the current exception, if any, we must to not corrupt it.
    PyObject *save_exception_type, *save_exception_value;
    PyTracebackObject *save_exception_tb;
    FETCH_ERROR_OCCURRED( &save_exception_type, &save_exception_value, &save_exception_tb );
    RESTORE_ERROR_OCCURRED( save_exception_type, save_exception_value, save_exception_tb );
#endif

    Nuitka_GC_UnTrack( function );

    if ( function->m_weakrefs != NULL )
    {
        PyObject_ClearWeakRefs( (PyObject *)function );
    }

    Py_DECREF( function->m_name );
#if PYTHON_VERSION >= 330
    Py_DECREF( function->m_qualname );
#endif

    // These may actually re-surrect the object, not?
    Py_XDECREF( function->m_dict );
    Py_DECREF( function->m_defaults );

    Py_DECREF( function->m_doc );

#if PYTHON_VERSION >= 300
    Py_DECREF( function->m_kwdefaults );
    Py_DECREF( function->m_annotations );
#endif

    for( Py_ssize_t i = 0; i < function->m_closure_given; i++ )
    {
        assert( function->m_closure[i] );
        Py_DECREF( function->m_closure[i] );
    }

    /* We abuse m_name for making a list of them. */
#if NUITKA_FUNCTION_FREE_LIST
    if ( free_list != NULL )
    {
        if ( free_list_count > MAX_FUNCTION_FREE_LIST_COUNT )
        {
            PyObject_GC_Del( function );
        }
        else
        {
            function->m_name = (PyObject *)free_list;
            free_list = function;

            free_list_count += 1;
        }
    }
    else
    {
        free_list = function;
        function->m_name = NULL;

        assert( free_list_count == 0 );

        free_list_count += 1;
    }
#else
    PyObject_GC_Del( function );
#endif

#ifndef __NUITKA_NO_ASSERT__
    PyThreadState *tstate = PyThreadState_GET();

    assert( tstate->curexc_type == save_exception_type );
    assert( tstate->curexc_value == save_exception_value );
    assert( (PyTracebackObject *)tstate->curexc_traceback == save_exception_tb );
#endif
}

static PyMethodDef Nuitka_Function_methods[] =
{
    { "__reduce__", (PyCFunction)Nuitka_Function_reduce, METH_NOARGS, NULL },
    { NULL }
};

PyTypeObject Nuitka_Function_Type =
{
    PyVarObject_HEAD_INIT(NULL, 0)
    "compiled_function",                            /* tp_name */
    sizeof(struct Nuitka_FunctionObject),           /* tp_basicsize */
    sizeof(struct Nuitka_CellObject *),             /* tp_itemsize */
    (destructor)Nuitka_Function_tp_dealloc,         /* tp_dealloc */
    0,                                              /* tp_print */
    0,                                              /* tp_getattr */
    0,                                              /* tp_setattr */
    0,                                              /* tp_compare */
    (reprfunc)Nuitka_Function_tp_repr,              /* tp_repr */
    0,                                              /* tp_as_number */
    0,                                              /* tp_as_sequence */
    0,                                              /* tp_as_mapping */
    (hashfunc)Nuitka_Function_tp_hash,              /* tp_hash */
    (ternaryfunc)Nuitka_Function_tp_call,           /* tp_call */
    0,                                              /* tp_str */
    PyObject_GenericGetAttr,                        /* tp_getattro */
    0,                                              /* tp_setattro */
    0,                                              /* tp_as_buffer */
    Py_TPFLAGS_DEFAULT       |
#if PYTHON_VERSION < 300
    Py_TPFLAGS_HAVE_WEAKREFS |
#endif
    Py_TPFLAGS_HAVE_GC,                             /* tp_flags */
    0,                                              /* tp_doc */
    (traverseproc)Nuitka_Function_tp_traverse,      /* tp_traverse */
    0,                                              /* tp_clear */
    0,                                              /* tp_richcompare */
    offsetof( struct Nuitka_FunctionObject, m_weakrefs ),  /* tp_weaklistoffset */
    0,                                              /* tp_iter */
    0,                                              /* tp_iternext */
    Nuitka_Function_methods,                        /* tp_methods */
    0,                                              /* tp_members */
    Nuitka_Function_getset,                         /* tp_getset */
    0,                                              /* tp_base */
    0,                                              /* tp_dict */
    Nuitka_Function_descr_get,                      /* tp_descr_get */
    0,                                              /* tp_descr_set */
    offsetof( struct Nuitka_FunctionObject, m_dict ), /* tp_dictoffset */
    0,                                              /* tp_init */
    0,                                              /* tp_alloc */
    0,                                              /* tp_new */
    0,                                              /* tp_free */
    0,                                              /* tp_is_gc */
    0,                                              /* tp_bases */
    0,                                              /* tp_mro */
    0,                                              /* tp_cache */
    0,                                              /* tp_subclasses */
    0,                                              /* tp_weaklist */
    0,                                              /* tp_del */
    0                                               /* tp_version_tag */
#if PYTHON_VERSION >= 340
    ,0                                              /* tp_finalizer */
#endif
};

void _initCompiledFunctionType( void )
{
    PyType_Ready( &Nuitka_Function_Type );
}


// Make a function with closure.
#if PYTHON_VERSION < 300
struct Nuitka_FunctionObject *Nuitka_Function_New( function_impl_code c_code, PyObject *name, PyCodeObject *code_object, PyObject *defaults, PyObject *module, PyObject *doc, Py_ssize_t closure_given )
#elif PYTHON_VERSION < 330
struct Nuitka_FunctionObject *Nuitka_Function_New( function_impl_code c_code, PyObject *name, PyCodeObject *code_object, PyObject *defaults, PyObject *kwdefaults, PyObject *annotations, PyObject *module, PyObject *doc, Py_ssize_t closure_given )
#else
struct Nuitka_FunctionObject *Nuitka_Function_New( function_impl_code c_code, PyObject *name, PyObject *qualname, PyCodeObject *code_object, PyObject *defaults, PyObject *kwdefaults, PyObject *annotations, PyObject *module, PyObject *doc, Py_ssize_t closure_given )
#endif
{
    struct Nuitka_FunctionObject *result;

#if NUITKA_FUNCTION_FREE_LIST
    if ( free_list != NULL )
    {
        result = free_list;
        free_list = (struct Nuitka_FunctionObject *)free_list->m_name;
        free_list_count -= 1;
        assert( free_list_count >= 0 );

        if ( Py_SIZE( result ) < closure_given + 1 )
        {
            result = PyObject_GC_Resize( struct Nuitka_FunctionObject, result, closure_given + 1 );
            assert( result != NULL );
        }

        _Py_NewReference( (PyObject *)result );
    }
    else
#endif
    {
        result = (struct Nuitka_FunctionObject *)Nuitka_GC_NewVar(
            &Nuitka_Function_Type,
            closure_given + 1         // TODO: This plus 1 seems off.
        );
    }

    CHECK_OBJECT( result );

    /* Closure is set externally */
    result->m_closure_given = closure_given;

    result->m_c_code = c_code;

    result->m_name = INCREASE_REFCOUNT( name );

#if PYTHON_VERSION >= 330
    result->m_qualname = INCREASE_REFCOUNT( qualname ? qualname : name );
#endif

    if ( defaults == NULL )
    {
        defaults = INCREASE_REFCOUNT( Py_None );
    }
    CHECK_OBJECT( defaults );
    assert( defaults == Py_None || ( PyTuple_Check( defaults ) && PyTuple_Size( defaults ) > 0 ) );
    result->m_defaults = defaults;

    onUpdatedDefaultsValue( result );

#if PYTHON_VERSION >= 300
    if ( kwdefaults == NULL )
    {
        kwdefaults = INCREASE_REFCOUNT( Py_None );
    }
    assert( kwdefaults == Py_None || ( PyDict_Check( kwdefaults ) && DICT_SIZE( kwdefaults ) > 0 ) );
    result->m_kwdefaults = kwdefaults;

    assert( annotations == Py_None || PyDict_Check( annotations ) );
    result->m_annotations = INCREASE_REFCOUNT( annotations );
#endif

    result->m_code_object = code_object;
    result->m_args_positional_count = code_object->co_argcount;
    result->m_args_keywords_count = result->m_args_positional_count;
#if PYTHON_VERSION >= 300
    result->m_args_keywords_count += code_object->co_kwonlyargcount;
#endif

    result->m_args_overall_count =
            result->m_args_keywords_count +
        (( code_object->co_flags & CO_VARARGS ) ? 1 : 0) +
        (( code_object->co_flags & CO_VARKEYWORDS ) ? 1 : 0);

    result->m_args_simple =
        ( code_object->co_flags & (CO_VARARGS|CO_VARKEYWORDS) ) == 0;
#if PYTHON_VERSION >= 300
    if ( code_object->co_kwonlyargcount > 0 ) result->m_args_simple = false;
#endif

    if ( ( code_object->co_flags & CO_VARARGS ) != 0 )
    {
        result->m_args_star_list_index = result->m_args_keywords_count;
    }
    else
    {
        result->m_args_star_list_index = -1;
    }

    if ( ( code_object->co_flags & CO_VARKEYWORDS ) != 0 )
    {
        result->m_args_star_dict_index = result->m_args_keywords_count;

        if ( code_object->co_flags & CO_VARARGS )
        {
            result->m_args_star_dict_index += 1;
        }
    }
    else
    {
        result->m_args_star_dict_index = -1;
    }

    result->m_varnames = &PyTuple_GET_ITEM( code_object->co_varnames, 0 );

    result->m_module = module;
    result->m_doc    = INCREASE_REFCOUNT( doc );

    result->m_dict   = NULL;
    result->m_weakrefs = NULL;

    static long Nuitka_Function_counter = 0;
    result->m_counter = Nuitka_Function_counter++;

    Nuitka_GC_Track( result );

    assert( Py_REFCNT( result ) == 1 );

    return result;
}

static void formatErrorNoArgumentAllowed( struct Nuitka_FunctionObject const *function,
#if PYTHON_VERSION >= 330
                                          PyObject *kw,
#endif
                                          Py_ssize_t given )
{
    char const *function_name =
       Nuitka_String_AsString( function->m_name );

#if PYTHON_VERSION < 330
    PyErr_Format(
        PyExc_TypeError,
        "%s() takes no arguments (%zd given)",
        function_name,
        given
    );
#else
    if ( kw == NULL )
    {
        PyErr_Format(
            PyExc_TypeError,
            "%s() takes 0 positional arguments but %zd was given",
            function_name,
            given
         );
    }
    else
    {
       PyObject *tmp_iter = PyObject_GetIter( kw );
       PyObject *tmp_arg_name = PyIter_Next( tmp_iter );
       Py_DECREF( tmp_iter );

       PyErr_Format( PyExc_TypeError,
           "%s() got an unexpected keyword argument '%s'",
           function_name,
           Nuitka_String_AsString( tmp_arg_name )
       );

       Py_DECREF( tmp_arg_name );
    }
#endif
}

static void formatErrorMultipleValuesGiven( struct Nuitka_FunctionObject const *function, Py_ssize_t index )
{
    char const *function_name =
       Nuitka_String_AsString( function->m_name );

    PyErr_Format(
        PyExc_TypeError,
#if PYTHON_VERSION < 330
        "%s() got multiple values for keyword argument '%s'",
#else
        "%s() got multiple values for argument '%s'",
#endif
        function_name,
        Nuitka_String_AsString( function->m_varnames[ index ] )
    );
}

#if PYTHON_VERSION < 330
static void formatErrorTooFewArguments( struct Nuitka_FunctionObject const *function,
#if PYTHON_VERSION < 270
                                        Py_ssize_t kw_size,
#endif
                                        Py_ssize_t given )
{
    Py_ssize_t required_parameter_count = function->m_args_positional_count -
                                          function->m_defaults_given;

    char const *function_name =
       Nuitka_String_AsString( function->m_name );
    char const *violation =
        ( function->m_defaults != Py_None || function->m_args_star_list_index != -1 ) ? "at least" : "exactly";
    char const *plural =
       required_parameter_count == 1 ? "" : "s";

#if PYTHON_VERSION < 270
    if ( kw_size > 0 )
    {
        PyErr_Format(
            PyExc_TypeError,
            "%s() takes %s %zd non-keyword argument%s (%zd given)",
            function_name,
            violation,
            required_parameter_count,
            plural,
            given - function->m_defaults_given
        );
    }
    else
    {
        PyErr_Format(
            PyExc_TypeError,
            "%s() takes %s %zd argument%s (%zd given)",
            function_name,
            violation,
            required_parameter_count,
            plural,
            given
        );
    }
#else
    PyErr_Format(
        PyExc_TypeError,
        "%s() takes %s %zd argument%s (%zd given)",
        function_name,
        violation,
        required_parameter_count,
        plural,
        given
    );
#endif
}
#else
static void formatErrorTooFewArguments( struct Nuitka_FunctionObject const *function,
                                        PyObject **values )
{
    char const *function_name =
       Nuitka_String_AsString( function->m_name );

    Py_ssize_t max_missing = 0;

    for( Py_ssize_t i = function->m_args_positional_count - 1 - function->m_defaults_given; i >= 0; --i )
    {
        if ( values[ i ] == NULL )
        {
            max_missing += 1;
        }
    }

    PyObject *list_str = PyUnicode_FromString( "" );

    PyObject *comma_str = PyUnicode_FromString( ", " );
    PyObject *and_str = PyUnicode_FromString(
        max_missing == 2 ? " and " : ", and "
    );

    Py_ssize_t missing = 0;
    for( Py_ssize_t i = function->m_args_positional_count - 1 - function->m_defaults_given; i >= 0; --i )
    {
        if ( values[ i ] == NULL )
        {
            PyObject *current_str = function->m_varnames[ i ];

            PyObject *current = PyObject_Repr( current_str );

            if ( missing == 0 )
            {
                PyObject *old = list_str;

                list_str = PyUnicode_Concat(
                    list_str,
                    current
                );

                Py_DECREF( old );
            }
            else if ( missing == 1 )
            {
                PyObject *old = list_str;

                list_str = PyUnicode_Concat(
                    and_str,
                    list_str
                );

                Py_DECREF( old );
                old = list_str;

                list_str = PyUnicode_Concat(
                    current,
                    list_str
                );

                Py_DECREF( old );
            }
            else
            {
                PyObject *old = list_str;

                list_str = PyUnicode_Concat(
                    comma_str,
                    list_str
                );

                Py_DECREF( old );
                old = list_str;

                list_str = PyUnicode_Concat(
                    current,
                    list_str
                );

                Py_DECREF( old );
            }

            Py_DECREF( current );

            missing += 1;
        }
    }

    Py_DECREF( comma_str );
    Py_DECREF( and_str );

    PyErr_Format(
        PyExc_TypeError,
        "%s() missing %zd required positional argument%s: %s",
        function_name,
        max_missing,
        max_missing > 1 ? "s" : "",
        Nuitka_String_AsString( list_str )
    );

    Py_DECREF( list_str );
}
#endif

static void formatErrorTooManyArguments( struct Nuitka_FunctionObject const *function,
                                         Py_ssize_t given
#if PYTHON_VERSION < 270
                                       , Py_ssize_t kw_size

#endif
#if PYTHON_VERSION >= 330
                                       , Py_ssize_t kw_only
#endif
)
{
    Py_ssize_t top_level_parameter_count = function->m_args_positional_count;

    char const *function_name =
       Nuitka_String_AsString( function->m_name );
#if PYTHON_VERSION < 330
    char const *violation =
       function->m_defaults != Py_None ? "at most" : "exactly";
#endif
    char const *plural =
       top_level_parameter_count == 1 ? "" : "s";

#if PYTHON_VERSION < 270
    PyErr_Format(
        PyExc_TypeError,
        "%s() takes %s %zd %sargument%s (%zd given)",
        function_name,
        violation,
        top_level_parameter_count,
        kw_size > 0 ? "non-keyword " : "",
        plural,
        given
    );
#elif PYTHON_VERSION < 300
    PyErr_Format(
        PyExc_TypeError,
        "%s() takes %s %zd argument%s (%zd given)",
        function_name,
        violation,
        top_level_parameter_count,
        plural,
        given
    );
#elif PYTHON_VERSION < 330
    PyErr_Format(
        PyExc_TypeError,
        "%s() takes %s %zd positional argument%s (%zd given)",
        function_name,
        violation,
        top_level_parameter_count,
        plural,
        given
    );
#else
    char keyword_only_part[100];

    if ( kw_only > 0 )
    {
        sprintf(
            keyword_only_part,
            " positional argument%s (and %" PY_FORMAT_SIZE_T "d keyword-only argument%s)",
            given != 1 ? "s" : "",
            kw_only,
            kw_only != 1 ? "s" : ""
        );
    }
    else
    {
        keyword_only_part[0] = 0;
    }

    if ( function->m_defaults_given == 0 )
    {
        PyErr_Format(
            PyExc_TypeError,
            "%s() takes %zd positional argument%s but %zd%s were given",
            function_name,
            top_level_parameter_count,
            plural,
            given,
            keyword_only_part
        );
    }
    else
    {
        PyErr_Format(
            PyExc_TypeError,
            "%s() takes from %zd to %zd positional argument%s but %zd%s were given",
            function_name,
            top_level_parameter_count - function->m_defaults_given,
            top_level_parameter_count,
            plural,
            given,
            keyword_only_part
        );
    }
#endif
}

#if PYTHON_VERSION >= 330
static void formatErrorTooFewKwOnlyArguments( struct Nuitka_FunctionObject const *function,
                                              PyObject **kw_vars )
{
    char const *function_name = Nuitka_String_AsString( function->m_name );

    Py_ssize_t kwonlyargcount = function->m_code_object->co_kwonlyargcount;

    Py_ssize_t max_missing = 0;

    for( Py_ssize_t i = kwonlyargcount-1; i >= 0; --i )
    {
        if ( kw_vars[ i ] == NULL )
        {
            max_missing += 1;
        }
    }

    PyObject *list_str = PyUnicode_FromString( "" );

    PyObject *comma_str = PyUnicode_FromString( ", " );
    PyObject *and_str = PyUnicode_FromString(
        max_missing == 2 ? " and " : ", and "
    );

    Py_ssize_t missing = 0;
    for( Py_ssize_t i = kwonlyargcount-1; i >= 0; --i )
    {
        if ( kw_vars[ i ] == NULL )
        {
            PyObject *current_str = function->m_varnames[ function->m_args_positional_count + i ];

            PyObject *current = PyObject_Repr( current_str );

            if ( missing == 0 )
            {
                PyObject *old = list_str;

                list_str = PyUnicode_Concat(
                    list_str,
                    current
                );

                Py_DECREF( old );
            }
            else if ( missing == 1 )
            {
                PyObject *old = list_str;

                list_str = PyUnicode_Concat(
                    and_str,
                    list_str
                );

                Py_DECREF( old );
                old = list_str;

                list_str = PyUnicode_Concat(
                    current,
                    list_str
                );

                Py_DECREF( old );
            }
            else
            {
                PyObject *old = list_str;

                list_str = PyUnicode_Concat(
                    comma_str,
                    list_str
                );

                Py_DECREF( old );
                old = list_str;

                list_str = PyUnicode_Concat(
                    current,
                    list_str
                );

                Py_DECREF( old );
            }

            Py_DECREF( current );

            missing += 1;
        }
    }

    Py_DECREF( comma_str );
    Py_DECREF( and_str );

    PyErr_Format(
        PyExc_TypeError,
        "%s() missing %zd required keyword-only argument%s: %s",
        function_name,
        max_missing,
        max_missing > 1 ? "s" : "",
        Nuitka_String_AsString( list_str )
    );

    Py_DECREF( list_str );
}
#endif


#if PYTHON_VERSION < 300
static Py_ssize_t handleKeywordArgs( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *kw )
#else
static Py_ssize_t handleKeywordArgs( struct Nuitka_FunctionObject const *function, PyObject **python_pars, Py_ssize_t *kw_only_found, PyObject *kw )
#endif
{
    Py_ssize_t keywords_count = function->m_args_keywords_count;

#if PYTHON_VERSION >= 300
    Py_ssize_t keyword_after_index = function->m_args_positional_count;
#endif

    assert( function->m_args_star_dict_index == -1 );

    Py_ssize_t kw_found = 0;
    Py_ssize_t ppos = 0;
    PyObject *key, *value;

    while( PyDict_Next( kw, &ppos, &key, &value ) )
    {
#if PYTHON_VERSION < 300
        if (unlikely( !PyString_Check( key ) && !PyUnicode_Check( key ) ))
#else
        if (unlikely( !PyUnicode_Check( key ) ))
#endif
        {
            PyErr_Format(
                PyExc_TypeError,
                "%s() keywords must be strings",
                Nuitka_String_AsString( function->m_name )
            );
            return -1;
        }

        NUITKA_MAY_BE_UNUSED bool found = false;

        Py_INCREF( key );
        Py_INCREF( value );

        for( Py_ssize_t i = 0; i < keywords_count; i++ )
        {
            if ( function->m_varnames[ i ] == key )
            {
                assert( python_pars[ i ] == NULL );
                python_pars[ i ] = value;

#if PYTHON_VERSION >= 300
                if ( i >= keyword_after_index )
                {
                    *kw_only_found += 1;
                }
#endif

                found = true;
                break;
            }
        }

        if ( found == false )
        {
            PyObject **varnames = function->m_varnames;

            for( Py_ssize_t i = 0; i < keywords_count; i++ )
            {
                if ( RICH_COMPARE_BOOL_EQ_NORECURSE( varnames[ i ], key ) )
                {
                    assert( python_pars[ i ] == NULL );
                    python_pars[ i ] = value;

#if PYTHON_VERSION >= 300
                    if ( i >= keyword_after_index )
                    {
                        *kw_only_found += 1;
                    }
#endif

                    found = true;
                    break;
                }
            }
        }

        if (unlikely( found == false ))
        {
            PyErr_Format(
                PyExc_TypeError,
                "%s() got an unexpected keyword argument '%s'",
                Nuitka_String_AsString( function->m_name ),
                Nuitka_String_Check( key ) ? Nuitka_String_AsString( key ) : "<non-string>"
            );

            Py_DECREF( key );
            Py_DECREF( value );

            return -1;
        }

        Py_DECREF( key );

        kw_found += 1;
    }

    return kw_found;
}


static bool MAKE_STAR_DICT_DICTIONARY_COPY( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *kw )
{
    Py_ssize_t star_dict_index = function->m_args_star_dict_index;
    assert( star_dict_index != -1 );

    if ( kw == NULL )
    {
        python_pars[ star_dict_index ] = PyDict_New();
    }
    else if ( ((PyDictObject *)kw)->ma_used > 0 )
    {
#if PYTHON_VERSION < 330
        python_pars[ star_dict_index ] = _PyDict_NewPresized( ((PyDictObject *)kw)->ma_used );

        for ( int i = 0; i <= ((PyDictObject *)kw)->ma_mask; i++ )
        {
            PyDictEntry *entry = &((PyDictObject *)kw)->ma_table[ i ];

            if ( entry->me_value != NULL )
            {

#if PYTHON_VERSION < 300
                if (unlikely( !PyString_Check( entry->me_key ) && !PyUnicode_Check( entry->me_key ) ))
#else
                if (unlikely( !PyUnicode_Check( entry->me_key ) ))
#endif
                {
                    PyErr_Format(
                        PyExc_TypeError,
                        "%s() keywords must be strings",
                        Nuitka_String_AsString( function->m_name )
                    );

                    return false;
                }

                int res = PyDict_SetItem( python_pars[ star_dict_index ], entry->me_key, entry->me_value );

                if (unlikely( res != 0 ))
                {
                    return false;
                }
            }
        }
#else
        if ( _PyDict_HasSplitTable( (PyDictObject *)kw) )
        {
            PyDictObject *mp = (PyDictObject *)kw;

            PyObject **newvalues = PyMem_NEW( PyObject *, mp->ma_keys->dk_size );
            assert( newvalues != NULL );

            PyDictObject *split_copy = PyObject_GC_New( PyDictObject, &PyDict_Type );
            assert( split_copy != NULL );

            split_copy->ma_values = newvalues;
            split_copy->ma_keys = mp->ma_keys;
            split_copy->ma_used = mp->ma_used;

            mp->ma_keys->dk_refcnt += 1;

            Nuitka_GC_Track( split_copy );

#if PYTHON_VERSION < 360
            Py_ssize_t size = mp->ma_keys->dk_size;
#else
            Py_ssize_t size = DK_USABLE_FRACTION(DK_SIZE(mp->ma_keys));
#endif
            for ( Py_ssize_t i = 0; i < size; i++ )
            {
#if PYTHON_VERSION < 360
                PyDictKeyEntry *entry = &split_copy->ma_keys->dk_entries[ i ];
#else
                PyDictKeyEntry *entry = &DK_ENTRIES( split_copy->ma_keys )[ i ];
#endif
                if ( ( entry->me_key != NULL ) && unlikely( !PyUnicode_Check( entry->me_key ) ))
                {
                    PyErr_Format(
                        PyExc_TypeError,
                        "%s() keywords must be strings",
                        Nuitka_String_AsString( function->m_name )
                    );

                    return false;
                }

                split_copy->ma_values[ i ] = mp->ma_values[ i ];
                Py_XINCREF( split_copy->ma_values[ i ] );
            }

            python_pars[ star_dict_index ] = (PyObject *)split_copy;
        }
        else
        {
            python_pars[ star_dict_index ] = PyDict_New();

            PyDictObject *mp = (PyDictObject *)kw;

#if PYTHON_VERSION < 360
            Py_ssize_t size = mp->ma_keys->dk_size;
#else
            Py_ssize_t size = mp->ma_keys->dk_nentries;
#endif
            for ( Py_ssize_t i = 0; i < size; i++ )
            {
#if PYTHON_VERSION < 360
                PyDictKeyEntry *entry = &mp->ma_keys->dk_entries[ i ];
#else
                PyDictKeyEntry *entry = &DK_ENTRIES( mp->ma_keys )[ i ];
#endif

                PyObject *value = entry->me_value;

                if ( value != NULL )
                {
                    if (unlikely( !PyUnicode_Check( entry->me_key ) ))
                    {
                        PyErr_Format(
                            PyExc_TypeError,
                            "%s() keywords must be strings",
                            Nuitka_String_AsString( function->m_name )
                        );

                        return false;
                    }

                    int res = PyDict_SetItem( python_pars[ star_dict_index ], entry->me_key, value );

                    if (unlikely( res != 0 ))
                    {
                        return false;
                    }
                }
            }
        }
#endif
    }
    else
    {
        python_pars[ star_dict_index ] = PyDict_New();
    }

    return true;
}


#if PYTHON_VERSION < 300
static Py_ssize_t handleKeywordArgsWithStarDict( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *kw )
#else
static Py_ssize_t handleKeywordArgsWithStarDict( struct Nuitka_FunctionObject const *function, PyObject **python_pars, Py_ssize_t *kw_only_found, PyObject *kw )
#endif
{
    assert( function->m_args_star_dict_index != -1 );

    if (unlikely( MAKE_STAR_DICT_DICTIONARY_COPY( function, python_pars, kw ) == false ))
    {
        return -1;
    }

    Py_ssize_t kw_found = 0;
    Py_ssize_t keywords_count = function->m_args_keywords_count;
#if PYTHON_VERSION >= 300
    Py_ssize_t keyword_after_index = function->m_args_positional_count;
#endif

    Py_ssize_t dict_star_index = function->m_args_star_dict_index;

    PyObject **varnames = function->m_varnames;

    for( Py_ssize_t i = 0; i < keywords_count; i++ )
    {
        PyObject *arg_name = varnames[ i ];

        PyObject *kw_arg_value = PyDict_GetItem(
            python_pars[ dict_star_index ],
            arg_name
        );

        if ( kw_arg_value != NULL )
        {
            assert( python_pars[ i ] == NULL );

            python_pars[ i ] = kw_arg_value;
            Py_INCREF( kw_arg_value );

            PyDict_DelItem( python_pars[ dict_star_index ], arg_name );

            kw_found += 1;

#if PYTHON_VERSION >= 300
            if ( i >= keyword_after_index )
            {
                *kw_only_found += 1;
            }
#endif
        }
    }

    return kw_found;
}

static void makeStarListTupleCopy( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject **args, Py_ssize_t args_size )
{
    assert( function->m_args_star_list_index != -1 );
    Py_ssize_t list_star_index = function->m_args_star_list_index;

    // Copy left-over argument values to the star list parameter given.
    if ( args_size > function->m_args_positional_count )
    {
        python_pars[ list_star_index ] = PyTuple_New( args_size - function->m_args_positional_count );

        for( Py_ssize_t i = 0; i < args_size - function->m_args_positional_count; i++ )
        {
            PyObject *value = args[ function->m_args_positional_count + i ];

            PyTuple_SET_ITEM( python_pars[ list_star_index ], i, value );
            Py_INCREF( value );
        }
    }
    else
    {
        python_pars[ list_star_index ] = const_tuple_empty;
        Py_INCREF( const_tuple_empty );
    }
}

static void makeStarListTupleCopyMethod( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject **args, Py_ssize_t args_size )
{
    assert( function->m_args_star_list_index != -1 );
    Py_ssize_t list_star_index = function->m_args_star_list_index;

    // Copy left-over argument values to the star list parameter given.
    if ( args_size + 1 > function->m_args_positional_count )
    {
        python_pars[ list_star_index ] = PyTuple_New( args_size + 1 - function->m_args_positional_count );

        for( Py_ssize_t i = 0; i < args_size + 1 - function->m_args_positional_count; i++ )
        {
            PyObject *value = args[ function->m_args_positional_count + i - 1 ];

            PyTuple_SET_ITEM( python_pars[ list_star_index ], i, value );
            Py_INCREF( value );
        }
    }
    else
    {
        python_pars[ list_star_index ] = const_tuple_empty;
        Py_INCREF( const_tuple_empty );
    }
}


static bool _handleArgumentsPlainOnly( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject **args, Py_ssize_t args_size )
{
    Py_ssize_t arg_count = function->m_args_positional_count;

    // Check if too many arguments were given in case of non list star arg.
    // For Python3.3 it's done only later, when more knowledge has
    // been gained. TODO: Could be done this way for improved mode
    // on all versions.
#if PYTHON_VERSION < 330
    if ( function->m_args_star_list_index == -1 )
    {
        if (unlikely( args_size > arg_count ))
        {
#if PYTHON_VERSION < 270
            formatErrorTooManyArguments( function, args_size, 0 );
#else
            formatErrorTooManyArguments( function, args_size );
#endif
            return false;
        }
    }
#endif

#if PYTHON_VERSION >= 330
    bool parameter_error = false;
#endif

    Py_ssize_t defaults_given = function->m_defaults_given;

    if ( args_size + defaults_given < arg_count )
    {
#if PYTHON_VERSION < 270
        formatErrorTooFewArguments( function, 0, args_size );
        return false;
#elif PYTHON_VERSION < 300
        formatErrorTooFewArguments( function, args_size );
        return false;
#elif PYTHON_VERSION < 330
        formatErrorTooFewArguments( function, args_size );
        return false;
#else
        parameter_error = true;
#endif
    }

    for( Py_ssize_t i = 0; i < args_size; i++ )
    {
        if ( i >= arg_count ) break;

        assert( python_pars[ i ] == NULL );

        python_pars[ i ] = args[ i ];
        Py_INCREF( python_pars[ i ] );
    }

#if PYTHON_VERSION >= 330
    if ( parameter_error == false )
    {
#endif
        PyObject **source = &PyTuple_GET_ITEM( function->m_defaults, 0 );

        for( Py_ssize_t i = args_size; i < arg_count; i++ )
        {
            assert( python_pars[ i ] == NULL );
            assert( i + defaults_given >= arg_count );

            python_pars[ i ] = source[ defaults_given + i - arg_count ];
            Py_INCREF( python_pars[ i ] );
        }
#if PYTHON_VERSION >= 330
    }
#endif

#if PYTHON_VERSION >= 330
    if (unlikely( parameter_error ))
    {
        formatErrorTooFewArguments( function, python_pars );
        return false;
    }

    if ( function->m_args_star_list_index == -1 )
    {
        // Check if too many arguments were given in case of non list star arg
        if (unlikely( args_size > arg_count ))
        {
            formatErrorTooManyArguments( function, args_size, 0 );
            return false;
        }
    }
#endif

    if ( function->m_args_star_list_index != -1 )
    {
        makeStarListTupleCopy( function, python_pars, args, args_size );
    }

    return true;
}

static bool handleMethodArgumentsPlainOnly( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *object, PyObject **args, Py_ssize_t args_size )
{
    Py_ssize_t arg_count = function->m_args_positional_count;

    // There may be no self, otherwise we can directly assign it.
    if ( arg_count >= 1 )
    {
        python_pars[ 0 ] = object;
        Py_INCREF( object );
    }
    else
    {
        // Without self, there can only be star list to get the object as its
        // first element. Or we complain about illegal arguments.
        if ( function->m_args_star_list_index == 0 )
        {
            python_pars[ 0 ] = PyTuple_New( args_size+1 );
            PyTuple_SET_ITEM( python_pars[ 0 ], 0, object );
            Py_INCREF( object );

            for( Py_ssize_t i = 0; i < args_size; i++ )
            {
                PyTuple_SET_ITEM( python_pars[ 0 ], i + 1, args[ i ] );
                Py_INCREF( args[ i ]);
            }

            return true;
        }
    }

    // Check if too many arguments were given in case of non list star arg.
    // For Python3.3 it's done only later, when more knowledge has
    // been gained. TODO: Could be done this way for improved mode
    // on all versions.
#if PYTHON_VERSION < 330
    if ( function->m_args_star_list_index == -1 )
    {
        if (unlikely( args_size + 1 > arg_count ))
        {
#if PYTHON_VERSION < 270
            formatErrorTooManyArguments( function, args_size + 1, 0 );
#else
            formatErrorTooManyArguments( function, args_size + 1 );
#endif
            return false;
        }
    }
#endif

#if PYTHON_VERSION >= 330
    bool parameter_error = false;
#endif
    Py_ssize_t defaults_given = function->m_defaults_given;

    if ( args_size + 1 + defaults_given < arg_count )
    {
#if PYTHON_VERSION < 270
        formatErrorTooFewArguments( function, 0, args_size + 1 );
        return false;
#elif PYTHON_VERSION < 300
        formatErrorTooFewArguments( function, args_size + 1 );
        return false;
#elif PYTHON_VERSION < 330
        formatErrorTooFewArguments( function, args_size + 1 );
        return false;
#else
        parameter_error = true;
#endif
    }

    for( Py_ssize_t i = 0; i < args_size; i++ )
    {
        if ( i+1 >= arg_count ) break;

        assert( python_pars[ i+1 ] == NULL );

        python_pars[ i+1 ] = args[ i ];
        Py_INCREF( python_pars[ i+1 ] );
    }

#if PYTHON_VERSION >= 330
    if ( parameter_error == false )
    {
#endif
        PyObject **source = &PyTuple_GET_ITEM( function->m_defaults, 0 );

        for( Py_ssize_t i = args_size + 1; i < arg_count; i++ )
        {
            assert( python_pars[ i ] == NULL );
            assert( i + defaults_given >= arg_count );

            python_pars[ i ] = source[ defaults_given + i - arg_count ];
            Py_INCREF( python_pars[ i ] );
        }
#if PYTHON_VERSION >= 330
    }
#endif

#if PYTHON_VERSION >= 330
    if (unlikely( parameter_error ))
    {
        formatErrorTooFewArguments( function, python_pars );
        return false;
    }

    if ( function->m_args_star_list_index == -1 )
    {
        // Check if too many arguments were given in case of non list star arg
        if (unlikely( args_size + 1 > arg_count ))
        {
            formatErrorTooManyArguments( function, args_size + 1, 0 );
            return false;
        }
    }
#endif

    if ( function->m_args_star_list_index != -1 )
    {
        makeStarListTupleCopyMethod( function, python_pars, args, args_size );
    }

    return true;
}


#if PYTHON_VERSION < 270
static bool handleArgumentsPlain( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *kw, PyObject **args, Py_ssize_t args_size, Py_ssize_t kw_found, Py_ssize_t kw_size )
#elif PYTHON_VERSION < 300
static bool handleArgumentsPlain( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *kw, PyObject **args, Py_ssize_t args_size, Py_ssize_t kw_found )
#else
static bool handleArgumentsPlain( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *kw, PyObject **args, Py_ssize_t args_size, Py_ssize_t kw_found, Py_ssize_t kw_only_found )
#endif
{
    Py_ssize_t arg_count = function->m_args_positional_count;

    // Check if too many arguments were given in case of non list star arg.
    // For Python3.3 it's done only later, when more knowledge has
    // been gained. TODO: Could be done this way for improved mode
    // on all versions.
#if PYTHON_VERSION < 330
    if ( function->m_args_star_list_index == -1 )
    {
        if (unlikely( args_size > arg_count ))
        {
#if PYTHON_VERSION < 270
            formatErrorTooManyArguments( function, args_size, kw_size );
#else
            formatErrorTooManyArguments( function, args_size + kw_found );
#endif
            return false;
        }
    }
#endif

#if PYTHON_VERSION >= 330
    bool parameter_error = false;
#endif

    if ( kw_found > 0 )
    {
        Py_ssize_t i;
        for( i = 0; i < (args_size < arg_count ? args_size : arg_count); i++ )
        {
            if (unlikely( python_pars[ i ] != NULL ))
            {
                formatErrorMultipleValuesGiven( function, i );
                return false;
            }

            python_pars[ i ] = args[ i ];
            Py_INCREF( python_pars[ i ] );
        }

        Py_ssize_t defaults_given = function->m_defaults_given;

        for( ; i < arg_count; i++ )
        {
            if ( python_pars[ i ] == NULL )
            {

                if ( i + defaults_given >= arg_count )
                {
                    python_pars[ i ] = PyTuple_GET_ITEM( function->m_defaults, defaults_given + i - arg_count );
                    Py_INCREF( python_pars[ i ] );
                }
                else
                {
#if PYTHON_VERSION < 270
                    formatErrorTooFewArguments( function, kw_size, args_size + kw_found );
                    return false;
#elif PYTHON_VERSION < 300
                    formatErrorTooFewArguments( function, args_size + kw_found );
                    return false;
#elif PYTHON_VERSION < 330
                    formatErrorTooFewArguments( function, args_size + kw_found - kw_only_found );
                    return false;
#else
                    parameter_error = true;
#endif
                }
            }
        }
    }
    else
    {
        Py_ssize_t usable = (args_size < arg_count ? args_size : arg_count);
        Py_ssize_t defaults_given = function->m_defaults_given;

        if ( defaults_given < arg_count - usable )
        {
#if PYTHON_VERSION < 270
            formatErrorTooFewArguments( function, kw_size, args_size + kw_found );
            return false;
#elif PYTHON_VERSION < 300
            formatErrorTooFewArguments( function, args_size + kw_found );
            return false;
#elif PYTHON_VERSION < 330
            formatErrorTooFewArguments( function, args_size + kw_found - kw_only_found );
            return false;
#else
            parameter_error = true;
#endif
        }

        for( Py_ssize_t i = 0; i < usable; i++ )
        {
            assert( python_pars[ i ] == NULL );

            python_pars[ i ] = args[ i ];
            Py_INCREF( python_pars[ i ] );
        }

#if PYTHON_VERSION >= 330
        if ( parameter_error == false )
        {
#endif
            PyObject **source = &PyTuple_GET_ITEM( function->m_defaults, 0 );

            for( Py_ssize_t i = usable; i < arg_count; i++ )
            {
                assert( python_pars[ i ] == NULL );
                assert( i + defaults_given >= arg_count );

                python_pars[ i ] = source[ defaults_given + i - arg_count ];
                Py_INCREF( python_pars[ i ] );
            }
#if PYTHON_VERSION >= 330
        }
#endif
    }

#if PYTHON_VERSION >= 330
    if (unlikely( parameter_error ))
    {
        formatErrorTooFewArguments( function, python_pars );
        return false;
    }

    if ( function->m_args_star_list_index == -1 )
    {
        // Check if too many arguments were given in case of non list star arg
        if (unlikely( args_size > arg_count ))
        {
            formatErrorTooManyArguments( function, args_size, kw_only_found );
            return false;
        }
    }
#endif

    if ( function->m_args_star_list_index != -1 )
    {
        makeStarListTupleCopy( function, python_pars, args, args_size );
    }

    return true;
}


// Release them all in case of an error.
static void releaseParameters( struct Nuitka_FunctionObject const *function, PyObject **python_pars )
{
    Py_ssize_t arg_count = function->m_args_overall_count;

    for ( Py_ssize_t i = 0; i < arg_count; i++ )
    {
        Py_XDECREF( python_pars[ i ] );
    }
}

bool parseArgumentsPos( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject **args, Py_ssize_t args_size )
{
    bool result;

    Py_ssize_t arg_count = function->m_args_positional_count;

#if PYTHON_VERSION >= 330
    bool kw_only_error;
#endif

    if (unlikely( arg_count == 0 && function->m_args_simple && args_size != 0 ))
    {
#if PYTHON_VERSION < 330
        formatErrorNoArgumentAllowed(
            function,
            args_size
        );
#else
        formatErrorNoArgumentAllowed(
            function,
            NULL,
            args_size
        );
#endif

        goto error_exit;
    }

    result = _handleArgumentsPlainOnly( function, python_pars, args, args_size );

    if ( result == false ) goto error_exit;

#if PYTHON_VERSION >= 300

    // For Python3.3 the keyword only errors are all reported at once.
#if PYTHON_VERSION >= 330
    kw_only_error = false;
#endif

    for( Py_ssize_t i = function->m_args_positional_count; i < function->m_args_keywords_count; i++ )
    {
        if ( python_pars[ i ] == NULL )
        {
            PyObject *arg_name = function->m_varnames[ i ];

            python_pars[ i ] = PyDict_GetItem( function->m_kwdefaults, arg_name );

#if PYTHON_VERSION < 330
            if (unlikely( python_pars[ i ] == NULL ))
            {
                PyErr_Format(
                    PyExc_TypeError,
                    "%s() needs keyword-only argument %s",
                    Nuitka_String_AsString( function->m_name ),
                    Nuitka_String_AsString( arg_name )
                );

                goto error_exit;
            }

            Py_INCREF( python_pars[ i ] );
#else
            if ( python_pars[ i ] == NULL )
            {
                kw_only_error = true;
            }
            else
            {
                Py_INCREF( python_pars[ i ] );
            }
#endif
        }
    }

#if PYTHON_VERSION >= 330
    if (unlikely( kw_only_error ))
    {
        formatErrorTooFewKwOnlyArguments( function, &python_pars[ function->m_args_positional_count ] );

        goto error_exit;
    }
#endif

#endif

    if ( function->m_args_star_dict_index != -1 )
    {
        python_pars[ function->m_args_star_dict_index ] = PyDict_New();
    }

    return true;

error_exit:

    releaseParameters( function, python_pars );
    return false;
}


bool parseArgumentsMethodPos( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject *object, PyObject **args, Py_ssize_t args_size )
{
    bool result;

#if PYTHON_VERSION >= 330
    bool kw_only_error;
#endif

    result = handleMethodArgumentsPlainOnly( function, python_pars, object, args, args_size );

    if ( result == false ) goto error_exit;

#if PYTHON_VERSION >= 300

    // For Python3.3 the keyword only errors are all reported at once.
#if PYTHON_VERSION >= 330
    kw_only_error = false;
#endif

    for( Py_ssize_t i = function->m_args_positional_count; i < function->m_args_keywords_count; i++ )
    {
        if ( python_pars[ i ] == NULL )
        {
            PyObject *arg_name = function->m_varnames[ i ];

            python_pars[ i ] = PyDict_GetItem( function->m_kwdefaults, arg_name );

#if PYTHON_VERSION < 330
            if (unlikely( python_pars[ i ] == NULL ))
            {
                PyErr_Format(
                    PyExc_TypeError,
                    "%s() needs keyword-only argument %s",
                    Nuitka_String_AsString( function->m_name ),
                    Nuitka_String_AsString( arg_name )
                );

                goto error_exit;
            }

            Py_INCREF( python_pars[ i ] );
#else
            if ( python_pars[ i ] == NULL )
            {
                kw_only_error = true;
            }
            else
            {
                Py_INCREF( python_pars[ i ] );
            }
#endif
        }
    }

#if PYTHON_VERSION >= 330
    if (unlikely( kw_only_error ))
    {
        formatErrorTooFewKwOnlyArguments( function, &python_pars[ function->m_args_positional_count ] );

        goto error_exit;
    }
#endif

#endif

    if ( function->m_args_star_dict_index != -1 )
    {
        python_pars[ function->m_args_star_dict_index ] = PyDict_New();
    }

    return true;

error_exit:

    releaseParameters( function, python_pars );
    return false;
}


static bool parseArgumentsFull( struct Nuitka_FunctionObject const *function, PyObject **python_pars, PyObject **args, Py_ssize_t args_size, PyObject *kw )
{
    Py_ssize_t kw_size = kw ? DICT_SIZE( kw ) : 0;
    Py_ssize_t kw_found;
    bool result;
#if PYTHON_VERSION >= 300
    Py_ssize_t kw_only_found;
#endif
#if PYTHON_VERSION >= 330
    bool kw_only_error;
#endif

    Py_ssize_t arg_count = function->m_args_keywords_count;

    assert( kw == NULL || PyDict_CheckExact( kw ) );

    if (unlikely( arg_count == 0 && function->m_args_simple && args_size + kw_size > 0 ))
    {
#if PYTHON_VERSION < 330
        formatErrorNoArgumentAllowed(
            function,
            args_size + kw_size
        );
#else
        formatErrorNoArgumentAllowed(
            function,
            kw_size > 0 ? kw : NULL,
            args_size
        );
#endif

        goto error_exit;
    }

#if PYTHON_VERSION >= 300
        kw_only_found = 0;
#endif
    if ( function->m_args_star_dict_index != -1 )
    {
#if PYTHON_VERSION < 300
        kw_found = handleKeywordArgsWithStarDict( function, python_pars, kw );
#else
        kw_found = handleKeywordArgsWithStarDict( function, python_pars, &kw_only_found, kw );
#endif
        if ( kw_found == -1 ) goto error_exit;
    }
    else if ( kw == NULL || DICT_SIZE( kw ) == 0 )
    {
        kw_found = 0;
    }
    else
    {
#if PYTHON_VERSION < 300
        kw_found = handleKeywordArgs( function, python_pars, kw );
#else
        kw_found = handleKeywordArgs( function, python_pars, &kw_only_found, kw );
#endif
        if ( kw_found == -1 ) goto error_exit;
    }

#if PYTHON_VERSION < 270
    result = handleArgumentsPlain( function, python_pars, kw, args, args_size, kw_found, kw_size );
#elif PYTHON_VERSION < 300
    result = handleArgumentsPlain( function, python_pars, kw, args, args_size, kw_found );
#else
    result = handleArgumentsPlain( function, python_pars, kw, args, args_size, kw_found, kw_only_found );
#endif

    if ( result == false ) goto error_exit;

#if PYTHON_VERSION >= 300

    // For Python3.3 the keyword only errors are all reported at once.
#if PYTHON_VERSION >= 330
    kw_only_error = false;
#endif

    for( Py_ssize_t i = function->m_args_positional_count; i < function->m_args_keywords_count; i++ )
    {
        if ( python_pars[ i ] == NULL )
        {
            PyObject *arg_name = function->m_varnames[ i ];

            python_pars[ i ] = PyDict_GetItem( function->m_kwdefaults, arg_name );

#if PYTHON_VERSION < 330
            if (unlikely( python_pars[ i ] == NULL ))
            {
                PyErr_Format(
                    PyExc_TypeError,
                    "%s() needs keyword-only argument %s",
                    Nuitka_String_AsString( function->m_name ),
                    Nuitka_String_AsString( arg_name )
                );

                goto error_exit;
            }

            Py_INCREF( python_pars[ i ] );
#else
            if ( python_pars[ i ] == NULL )
            {
                kw_only_error = true;
            }
            else
            {
                Py_INCREF( python_pars[ i ] );
            }
#endif
        }
    }

#if PYTHON_VERSION >= 330
    if (unlikely( kw_only_error ))
    {
        formatErrorTooFewKwOnlyArguments( function, &python_pars[ function->m_args_positional_count ] );

        goto error_exit;
    }
#endif

#endif

    return true;

error_exit:

    releaseParameters( function, python_pars );
    return false;
}

PyObject *Nuitka_CallFunctionPosArgsKwArgs( struct Nuitka_FunctionObject const *function, PyObject **args, Py_ssize_t args_size, PyObject *kw )
{
#ifdef _MSC_VER
    PyObject **python_pars = (PyObject **)_alloca( sizeof( PyObject * ) * function->m_args_overall_count );
#else
    PyObject *python_pars[ function->m_args_overall_count ];
#endif
    memset( python_pars, 0, function->m_args_overall_count * sizeof(PyObject *) );

    if (!parseArgumentsFull( function, python_pars, args, args_size, kw )) return NULL;
    return function->m_c_code( function, python_pars );
}

PyObject *Nuitka_CallMethodFunctionNoArgs( struct Nuitka_FunctionObject const *function, PyObject *object )
{
#ifdef _MSC_VER
    PyObject **python_pars = (PyObject **)_alloca( sizeof( PyObject * ) * function->m_args_overall_count );
#else
    PyObject *python_pars[ function->m_args_overall_count ];
#endif
    memset( python_pars, 0, function->m_args_overall_count * sizeof(PyObject *) );


    bool result;

#if PYTHON_VERSION >= 330
    bool kw_only_error;
#endif

    result = handleMethodArgumentsPlainOnly( function, python_pars, object, NULL, 0 );

    if ( result == false ) goto error_exit;

#if PYTHON_VERSION >= 300

    // For Python3.3 the keyword only errors are all reported at once.
#if PYTHON_VERSION >= 330
    kw_only_error = false;
#endif

    for( Py_ssize_t i = function->m_args_positional_count; i < function->m_args_keywords_count; i++ )
    {
        if ( python_pars[ i ] == NULL )
        {
            PyObject *arg_name = function->m_varnames[ i ];

            python_pars[ i ] = PyDict_GetItem( function->m_kwdefaults, arg_name );

#if PYTHON_VERSION < 330
            if (unlikely( python_pars[ i ] == NULL ))
            {
                PyErr_Format(
                    PyExc_TypeError,
                    "%s() needs keyword-only argument %s",
                    Nuitka_String_AsString( function->m_name ),
                    Nuitka_String_AsString( arg_name )
                );

                goto error_exit;
            }

            Py_INCREF( python_pars[ i ] );
#else
            if ( python_pars[ i ] == NULL )
            {
                kw_only_error = true;
            }
            else
            {
                Py_INCREF( python_pars[ i ] );
            }
#endif
        }
    }

#if PYTHON_VERSION >= 330
    if (unlikely( kw_only_error ))
    {
        formatErrorTooFewKwOnlyArguments( function, &python_pars[ function->m_args_positional_count ] );

        goto error_exit;
    }
#endif

#endif

    if ( function->m_args_star_dict_index != -1 )
    {
        python_pars[ function->m_args_star_dict_index ] = PyDict_New();
    }

    return function->m_c_code( function, python_pars );

error_exit:

    releaseParameters( function, python_pars );
    return NULL;

}

PyObject *Nuitka_CallMethodFunctionPosArgsKwArgs( struct Nuitka_FunctionObject const *function, PyObject *object, PyObject **args, Py_ssize_t args_size, PyObject *kw )
{
#ifdef _MSC_VER
    PyObject **new_args = (PyObject **)_alloca( sizeof( PyObject * ) *( args_size + 1 ) );
#else
    PyObject *new_args[ args_size + 1 ];
#endif
    new_args[ 0 ] = object;
    memcpy( new_args + 1, args, args_size * sizeof( PyObject *) );

    // TODO: Specialize implementation for massive gains.
    return Nuitka_CallFunctionPosArgsKwArgs( function, new_args, args_size + 1, kw );
}
