Create property cache in case of Component{} root

Change-Id: I36f969d09d8ce5e0b68b657b514586990e88ebe4
Task-number: QTBUG-19354
(cherry picked from commit af1350249ea9de68e1c4b72ed1179948aa28ca19)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/declarative/qml/qdeclarativecompiler.cpp b/src/declarative/qml/qdeclarativecompiler.cpp
index 72010c0ef2..43bb58c88a 100644
--- a/src/declarative/qml/qdeclarativecompiler.cpp
+++ b/src/declarative/qml/qdeclarativecompiler.cpp
@@ -650,6 +650,7 @@ bool QDeclarativeCompiler::compile(QDeclarativeEngine *engine,
             out->dumpInstructions();
         if (compilerStatDump())
             dumpStats();
+        Q_ASSERT(out->rootPropertyCache);
     } else {
         reset(out);
     }
@@ -1230,6 +1231,11 @@ void QDeclarativeCompiler::genComponent(QDeclarativeParser::Object *obj)
         id.setId.index = obj->idIndex;
         output->addInstruction(id);
     }
+
+    if (obj == unitRoot) {
+        output->rootPropertyCache = output->types[obj->type].createPropertyCache(engine);
+        output->rootPropertyCache->addref();
+    }
 }
 
 bool QDeclarativeCompiler::buildComponent(QDeclarativeParser::Object *obj,