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diff --git a/sources/pyside2/libpyside/pysideslot.cpp b/sources/pyside2/libpyside/pysideslot.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of PySide2.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "dynamicqmetaobject_p.h"
+#include "pysidesignal_p.h"
+#include "pysideslot_p.h"
+
+#include <shiboken.h>
+#include <QString>
+#include <QMetaObject>
+
+#define SLOT_DEC_NAME "Slot"
+
+typedef struct
+{
+ PyObject_HEAD
+ char* slotName;
+ char* args;
+ char* resultType;
+} PySideSlot;
+
+extern "C"
+{
+
+static int slotTpInit(PyObject*, PyObject*, PyObject*);
+static PyObject* slotCall(PyObject*, PyObject*, PyObject*);
+
+// Class Definition -----------------------------------------------
+static PyTypeObject PySideSlotType = {
+ PyVarObject_HEAD_INIT(0, 0)
+ "PySide2.QtCore." SLOT_DEC_NAME, /*tp_name*/
+ sizeof(PySideSlot), /*tp_basicsize*/
+ 0, /*tp_itemsize*/
+ 0, /*tp_dealloc*/
+ 0, /*tp_print*/
+ 0, /*tp_getattr*/
+ 0, /*tp_setattr*/
+ 0, /*tp_compare*/
+ 0, /*tp_repr*/
+ 0, /*tp_as_number*/
+ 0, /*tp_as_sequence*/
+ 0, /*tp_as_mapping*/
+ 0, /*tp_hash */
+ slotCall, /*tp_call*/
+ 0, /*tp_str*/
+ 0, /*tp_getattro*/
+ 0, /*tp_setattro*/
+ 0, /*tp_as_buffer*/
+ Py_TPFLAGS_DEFAULT, /*tp_flags*/
+ SLOT_DEC_NAME, /*tp_doc */
+ 0, /*tp_traverse */
+ 0, /*tp_clear */
+ 0, /*tp_richcompare */
+ 0, /*tp_weaklistoffset */
+ 0, /*tp_iter */
+ 0, /*tp_iternext */
+ 0, /*tp_methods */
+ 0, /*tp_members */
+ 0, /*tp_getset */
+ 0, /*tp_base */
+ 0, /*tp_dict */
+ 0, /*tp_descr_get */
+ 0, /*tp_descr_set */
+ 0, /*tp_dictoffset */
+ slotTpInit, /*tp_init */
+ 0, /*tp_alloc */
+ PyType_GenericNew, /*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*/
+};
+
+int slotTpInit(PyObject *self, PyObject *args, PyObject *kw)
+{
+ static PyObject *emptyTuple = 0;
+ static const char *kwlist[] = {"name", "result", 0};
+ char* argName = 0;
+ PyObject* argResult = 0;
+
+ if (emptyTuple == 0)
+ emptyTuple = PyTuple_New(0);
+
+ if (!PyArg_ParseTupleAndKeywords(emptyTuple, kw, "|sO:QtCore." SLOT_DEC_NAME, (char**) kwlist, &argName, &argResult))
+ return 0;
+
+ PySideSlot *data = reinterpret_cast<PySideSlot*>(self);
+ for(Py_ssize_t i = 0, i_max = PyTuple_Size(args); i < i_max; i++) {
+ PyObject *argType = PyTuple_GET_ITEM(args, i);
+ char *typeName = PySide::Signal::getTypeName(argType);
+ if (typeName) {
+ if (data->args) {
+ data->args = reinterpret_cast<char*>(realloc(data->args, (strlen(data->args) + 1 + strlen(typeName)) * sizeof(char*)));
+ data->args = strcat(data->args, ",");
+ data->args = strcat(data->args, typeName);
+ free(typeName);
+ } else {
+ data->args = typeName;
+ }
+ } else {
+ PyErr_Format(PyExc_TypeError, "Unknown signal argument type: %s", argType->ob_type->tp_name);
+ return -1;
+ }
+ }
+
+ if (argName)
+ data->slotName = strdup(argName);
+
+ if (argResult)
+ data->resultType = PySide::Signal::getTypeName(argResult);
+ else
+ data->resultType = strdup("void");
+
+ return 1;
+}
+
+PyObject *slotCall(PyObject *self, PyObject *args, PyObject * /* kw */)
+{
+ static PyObject* pySlotName = 0;
+ PyObject* callback;
+ callback = PyTuple_GetItem(args, 0);
+ Py_INCREF(callback);
+
+ if (PyFunction_Check(callback)) {
+ PySideSlot *data = reinterpret_cast<PySideSlot*>(self);
+
+ if (!data->slotName) {
+ PyObject *funcName = reinterpret_cast<PyFunctionObject*>(callback)->func_name;
+ data->slotName = strdup(Shiboken::String::toCString(funcName));
+ }
+
+
+ QByteArray returnType = QMetaObject::normalizedType(data->resultType);
+ QByteArray signature = QString().sprintf("%s(%s)", data->slotName, data->args).toUtf8();
+ signature = returnType + " " + signature;
+
+ if (!pySlotName)
+ pySlotName = Shiboken::String::fromCString(PYSIDE_SLOT_LIST_ATTR);
+
+ PyObject *pySignature = Shiboken::String::fromCString(signature);
+ PyObject *signatureList = 0;
+ if (PyObject_HasAttr(callback, pySlotName)) {
+ signatureList = PyObject_GetAttr(callback, pySlotName);
+ } else {
+ signatureList = PyList_New(0);
+ PyObject_SetAttr(callback, pySlotName, signatureList);
+ Py_DECREF(signatureList);
+ }
+
+ PyList_Append(signatureList, pySignature);
+ Py_DECREF(pySignature);
+
+ //clear data
+ free(data->slotName);
+ data->slotName = 0;
+ free(data->resultType);
+ data->resultType = 0;
+ free(data->args);
+ data->args = 0;
+ return callback;
+ }
+ return callback;
+}
+
+} // extern "C"
+
+namespace PySide { namespace Slot {
+
+void init(PyObject* module)
+{
+ if (PyType_Ready(&PySideSlotType) < 0)
+ return;
+
+ Py_INCREF(&PySideSlotType);
+ PyModule_AddObject(module, SLOT_DEC_NAME, reinterpret_cast<PyObject *>(&PySideSlotType));
+}
+
+} // namespace Slot
+} // namespace PySide