libpyside: Add a debug operator for PyObjectWrapperHEADdev

This useful for debugging QML issues.

Task-number: PYSIDE-2193
Pick-to: 6.9
Change-Id: Iecbfb1d9508ac89c8b213a2f2ee8d4f7f1de4fc8
Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io>

2 files changed, 26 insertions, 1 deletions

diff --git a/sources/pyside6/libpyside/signalmanager.cpp b/sources/pyside6/libpyside/signalmanager.cpp
index e5f069c86..8b7b45546 100644
--- a/sources/pyside6/libpyside/signalmanager.cpp
+++ b/sources/pyside6/libpyside/signalmanager.cpp
@@ -26,6 +26,7 @@
 #include <QtCore/qhash.h>
 #include <QtCore/qscopedpointer.h>
 
+#include <climits>
 #include <memory>
 #include <utility>
 
@@ -233,7 +234,29 @@ QDataStream &operator>>(QDataStream &in, PyObjectWrapper &myObj)
     return in;
 }
 
-};
+PYSIDE_API QDebug operator<<(QDebug debug, const PyObjectWrapper &myObj)
+{
+    QDebugStateSaver saver(debug);
+    debug.noquote();
+    debug.nospace();
+    // Do not repeat the type name as it is typically called from the QVariant debug
+    // operator, which outputs the type.
+    debug << '<';
+    if (PyObject *ob = myObj) {
+        const auto refs = Py_REFCNT(ob);
+        debug << Py_TYPE(ob)->tp_name << " at " << ob;
+        if (refs == UINT_MAX) // _Py_IMMORTAL_REFCNT
+            debug << ", immortal";
+        else
+            debug << ", refs=" << refs;
+    } else {
+        debug << '0';
+    }
+    debug << '>';
+    return debug;
+}
+
+} // namespace PySide
 
 using namespace PySide;
 
diff --git a/sources/pyside6/libpyside/signalmanager.h b/sources/pyside6/libpyside/signalmanager.h
index 52bb5f1d1..7c2977239 100644
--- a/sources/pyside6/libpyside/signalmanager.h
+++ b/sources/pyside6/libpyside/signalmanager.h
@@ -14,6 +14,7 @@
 #include <optional>
 
 QT_FORWARD_DECLARE_CLASS(QDataStream)
+QT_FORWARD_DECLARE_CLASS(QDebug)
 
 namespace PySide
 {
@@ -49,6 +50,7 @@ private:
 
 PYSIDE_API QDataStream &operator<<(QDataStream& out, const PyObjectWrapper& myObj);
 PYSIDE_API QDataStream &operator>>(QDataStream& in, PyObjectWrapper& myObj);
+PYSIDE_API QDebug operator<<(QDebug debug, const PyObjectWrapper &myObj);
 
 class PYSIDE_API SignalManager
 {