shiboken6: Generate Python override code for added virtuals

Introduce "Python override" as a special type of user-added function
which will cause a function calling a Python override into the native
wrapper. This can then be called from a virtual that has a signature
which cannot be handled in Python.

Fixes: PYSIDE-2602
Pick-to: 6.7
Change-Id: I5fc44ebe3f585078e87d3230d5e6f4faa67a4ee1
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

2 files changed, 24 insertions, 0 deletions

diff --git a/sources/shiboken6/tests/samplebinding/derived_test.py b/sources/shiboken6/tests/samplebinding/derived_test.py
index 418c990d3..346f29136 100644
--- a/sources/shiboken6/tests/samplebinding/derived_test.py
+++ b/sources/shiboken6/tests/samplebinding/derived_test.py
@@ -33,6 +33,15 @@ class Deviant(Derived):
         return 'Deviant'
 
 
+class ImplementVirtualWithOutParameter(Derived):
+    def __init__(self, value):
+        super().__init__()
+        self._value = value
+
+    def virtualWithOutParameter(self):
+        return self._value
+
+
 class DerivedTest(unittest.TestCase):
     '''Test case for Derived class'''
 
@@ -122,6 +131,13 @@ class DerivedTest(unittest.TestCase):
         obj = DerivedUsingCt(42)
         self.assertEqual(obj.value(), 42)
 
+    def testVirtualWithOutParameter(self):
+        d = Derived()
+        self.assertEqual(d.callVirtualWithOutParameter(), 42)
+
+        d = ImplementVirtualWithOutParameter(1)
+        self.assertEqual(d.callVirtualWithOutParameter(), 1)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/sources/shiboken6/tests/samplebinding/typesystem_sample.xml b/sources/shiboken6/tests/samplebinding/typesystem_sample.xml
index 36134e649..e315e599e 100644
--- a/sources/shiboken6/tests/samplebinding/typesystem_sample.xml
+++ b/sources/shiboken6/tests/samplebinding/typesystem_sample.xml
@@ -571,6 +571,14 @@
         <modify-function signature="hideFunction(HideType*)" remove="all"/>
         <modify-field name="toBeRenamedField" rename="renamedField"/>
         <modify-field name="readOnlyField" write="false"/>
+        <modify-function signature="virtualWithOutParameter(int&amp;)const">
+            <inject-code class="shell" position="override">
+            x = virtualWithOutParameterPyOverride(gil, pyOverride.object());
+            return;
+            </inject-code>
+        </modify-function>
+        <add-function signature="virtualWithOutParameterPyOverride()"
+                      return-type="int" python-override="true"/>
     </object-type>
 
     <object-type name="Derived" polymorphic-id-expression="%1->type() == Derived::TpDerived">