Create property cache in case of Component{} root

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

4 files changed, 23 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,
diff --git a/tests/auto/declarative/qdeclarativelanguage/data/NestedComponentRoot.qml b/tests/auto/declarative/qdeclarativelanguage/data/NestedComponentRoot.qml
new file mode 100644
index 0000000000..785a27dd79
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativelanguage/data/NestedComponentRoot.qml
@@ -0,0 +1,6 @@
+import QtQuick 1.0
+
+Component {
+    Item {
+    }
+}
diff --git a/tests/auto/declarative/qdeclarativelanguage/data/nestedComponentRoots.qml b/tests/auto/declarative/qdeclarativelanguage/data/nestedComponentRoots.qml
new file mode 100644
index 0000000000..361bcbcb56
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativelanguage/data/nestedComponentRoots.qml
@@ -0,0 +1,4 @@
+import QtQuick 1.0
+
+NestedComponentRoot {
+}
diff --git a/tests/auto/declarative/qdeclarativelanguage/tst_qdeclarativelanguage.cpp b/tests/auto/declarative/qdeclarativelanguage/tst_qdeclarativelanguage.cpp
index 132c947d93..3c6ce9da6d 100644
--- a/tests/auto/declarative/qdeclarativelanguage/tst_qdeclarativelanguage.cpp
+++ b/tests/auto/declarative/qdeclarativelanguage/tst_qdeclarativelanguage.cpp
@@ -135,6 +135,7 @@ private slots:
     void reservedWords_data();
     void reservedWords();
     void inlineAssignmentsOverrideBindings();
+    void nestedComponentRoots();
 
     void basicRemote_data();
     void basicRemote();
@@ -1428,6 +1429,12 @@ void tst_qdeclarativelanguage::inlineAssignmentsOverrideBindings()
     delete o;
 }
 
+// QTBUG-19354
+void tst_qdeclarativelanguage::nestedComponentRoots()
+{
+    QDeclarativeComponent component(&engine, TEST_FILE("nestedComponentRoots.qml"));
+}
+
 // Import tests (QT-558)
 void tst_qdeclarativelanguage::importsBuiltin_data()
 {