Add a QJSManagedValue

A QJSManagedValue is a view on a QJSValue which always knows the engine
the value belongs to. This allows us to implement the JavaScript
semantics of the various QJSValue methods in a much more rigorous way.

[ChangeLog][QtQml] The new QJSManagedValue should be used instead of
QJSValue for manipulating properties and prototypes of JavaScript
values, as well as for calling JavaScript functions.

Change-Id: I9d445ffcf68dfa72dba9bae0818e83c80665ad66
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/qml/jsapi/qjsengine.cpp b/src/qml/jsapi/qjsengine.cpp
index a0e2cb2c3a..f0e3e69fbb 100644
--- a/src/qml/jsapi/qjsengine.cpp
+++ b/src/qml/jsapi/qjsengine.cpp
@@ -728,6 +728,13 @@ QJSValue QJSEngine::globalObject() const
     return QJSValuePrivate::fromReturnedValue(v->asReturnedValue());
 }
 
+QJSManagedValue QJSEngine::createManaged(QMetaType type, const void *ptr)
+{
+    QJSManagedValue result(m_v4Engine);
+    *result.d = m_v4Engine->metaTypeToJS(type.id(), ptr);
+    return result;
+}
+
 /*!
  *  \internal
  * used by QJSEngine::toScriptValue
@@ -739,6 +746,11 @@ QJSValue QJSEngine::create(int type, const void *ptr)
     return QJSValuePrivate::fromReturnedValue(v->asReturnedValue());
 }
 
+bool QJSEngine::convertManaged(const QJSManagedValue &value, int type, void *ptr)
+{
+    return QV4::ExecutionEngine::metaTypeFromJS(*value.d, type, ptr);
+}
+
 /*!
     \internal
     convert \a value to \a type, store the result in \a ptr