Reduce the amount of malloc calls when instantiating objects

For regular Qt types we currently perform three mallocs, one for the
public class, one for the private and one for the declarative data.
The latter we can fold quite easily into the malloc of the public class.
The plan for the private is a bigger separate one ;-)

Change-Id: I69973652ba70a4a238b491dff3d47a9db9a226f1
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/qml/qml/qqmlobjectcreator.cpp b/src/qml/qml/qqmlobjectcreator.cpp
index 3000f3e695..b354104b6e 100644
--- a/src/qml/qml/qqmlobjectcreator.cpp
+++ b/src/qml/qml/qqmlobjectcreator.cpp
@@ -1039,12 +1039,20 @@ QObject *QQmlObjectCreator::createInstance(int index, QObject *parent, bool isCo
         if (type) {
             Q_QML_OC_PROFILE(sharedState->profiler, profiler.update(
                                  compilationUnit, obj, type->qmlTypeName(), context->url()));
-            instance = type->create();
+
+            void *ddataMemory = 0;
+            type->create(&instance, &ddataMemory, sizeof(QQmlData));
             if (!instance) {
                 recordError(obj->location, tr("Unable to create object of type %1").arg(stringAt(obj->inheritedTypeNameIndex)));
                 return 0;
             }
 
+            {
+                QQmlData *ddata = new (ddataMemory) QQmlData;
+                ddata->ownMemory = false;
+                QObjectPrivate::get(instance)->declarativeData = ddata;
+            }
+
             const int parserStatusCast = type->parserStatusCast();
             if (parserStatusCast != -1)
                 parserStatus = reinterpret_cast<QQmlParserStatus*>(reinterpret_cast<char *>(instance) + parserStatusCast);