1 files changed, 67 insertions, 0 deletions
diff --git a/sources/pyside6/libpysideqml/pysideqmlmetacallerror.cpp b/sources/pyside6/libpysideqml/pysideqmlmetacallerror.cpp
new file mode 100644
index 000000000..63cefedb5
--- /dev/null
+++ b/sources/pyside6/libpysideqml/pysideqmlmetacallerror.cpp
@@ -0,0 +1,67 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "pysideqmlmetacallerror_p.h"
+
+#include <sbkpython.h>
+#include <sbkstring.h>
+#include <autodecref.h>
+
+// Remove deprecated MACRO of copysign for MSVC #86286
+// https://github.com/python/cpython/issues/86286
+#ifdef copysign
+#  undef copysign
+#endif
+
+#include <QtCore/QObject>
+#include <QtCore/QString>
+
+#include <QtQml/QQmlEngine>
+#include <QtQml/QQmlListProperty>
+
+#if __has_include (<private/qv4engine_p.h>)
+#  define QML_PRIVATE_API_SUPPORT
+#  include <private/qv4engine_p.h>
+#  include <private/qv4context_p.h>
+#  include <private/qqmldata_p.h>
+#endif
+
+namespace PySide::Qml {
+
+std::optional<int> qmlMetaCallErrorHandler(QObject *object)
+{
+#ifdef QML_PRIVATE_API_SUPPORT
+    // This JS engine grabber based off of Qt 5.5's `qjsEngine` function
+    QQmlData *data = QQmlData::get(object, false);
+    if (!data || data->jsWrapper.isNullOrUndefined())
+        return {};
+
+    QV4::ExecutionEngine *engine = data->jsWrapper.engine();
+    if (engine->currentStackFrame == nullptr)
+        return {};
+
+    PyObject *errType, *errValue, *errTraceback;
+    PyErr_Fetch(&errType, &errValue, &errTraceback);
+    // PYSIDE-464: The error is only valid before PyErr_Restore,
+    // PYSIDE-464: therefore we take local copies.
+    Shiboken::AutoDecRef objStr(PyObject_Str(errValue));
+    const QString errString = QString::fromUtf8(Shiboken::String::toCString(objStr));
+    const bool isSyntaxError = errType == PyExc_SyntaxError;
+    const bool isTypeError = errType == PyExc_TypeError;
+    PyErr_Restore(errType, errValue, errTraceback);
+
+    PyErr_Print();    // Note: PyErr_Print clears the error.
+
+    if (isSyntaxError)
+        return engine->throwSyntaxError(errString);
+    if (isTypeError)
+        return engine->throwTypeError(errString);
+    return engine->throwError(errString);
+#else
+    Q_UNUSED(object);
+    qWarning("libpyside6qml was built without QML private API support, error handling will not work.");
+    return {};
+#endif //  QML_PRIVATE_API_SUPPORT
+}
+
+} // namespace PySide::Qml