Implement lookups for qml type wrappers

Task-number: QTBUG-77237
Change-Id: I661dc7a23946520c8ad298c39796cb8d0561d80c
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

3 files changed, 33 insertions, 3 deletions

diff --git a/src/qml/jsruntime/qv4lookup_p.h b/src/qml/jsruntime/qv4lookup_p.h
index 7578de4d14..fb4c5f6864 100644
--- a/src/qml/jsruntime/qv4lookup_p.h
+++ b/src/qml/jsruntime/qv4lookup_p.h
@@ -151,6 +151,10 @@ struct Q_QML_PRIVATE_EXPORT Lookup {
             quintptr reserved3;
             ReturnedValue (*getterTrampoline)(Lookup *l, ExecutionEngine *engine);
         } qmlContextGlobalLookup;
+        struct {
+            Heap::Object *qmlTypeWrapper;
+            quintptr unused2;
+        } qmlTypeLookup;
     };
     uint nameIndex;
 
diff --git a/src/qml/jsruntime/qv4qmlcontext.cpp b/src/qml/jsruntime/qv4qmlcontext.cpp
index c832bff051..e2d3b98ff6 100644
--- a/src/qml/jsruntime/qv4qmlcontext.cpp
+++ b/src/qml/jsruntime/qv4qmlcontext.cpp
@@ -248,11 +248,15 @@ ReturnedValue QQmlContextWrapper::getPropertyAndBase(const QQmlContextWrapper *r
                         return lookup->qmlContextPropertyGetter(lookup, v4, base);
                     }
                 }
-                return QQmlTypeWrapper::create(v4, scopeObject, r.type);
+                result = QQmlTypeWrapper::create(v4, scopeObject, r.type);
             } else if (r.importNamespace) {
-                return QQmlTypeWrapper::create(v4, scopeObject, context->imports, r.importNamespace);
+                result = QQmlTypeWrapper::create(v4, scopeObject, context->imports, r.importNamespace);
             }
-            Q_ASSERT(!"Unreachable");
+            if (lookup) {
+                lookup->qmlTypeLookup.qmlTypeWrapper = static_cast<Heap::Object*>(result->heapObject());
+                lookup->qmlContextPropertyGetter = QQmlContextWrapper::lookupType;
+            }
+            return result->asReturnedValue();
         }
 
         // Fall through
@@ -659,6 +663,27 @@ ReturnedValue QQmlContextWrapper::lookupInParentContextHierarchy(Lookup *l, Exec
     return Encode::undefined();
 }
 
+ReturnedValue QQmlContextWrapper::lookupType(Lookup *l, ExecutionEngine *engine, Value *base)
+{
+    Scope scope(engine);
+    Scoped<QmlContext> qmlContext(scope, engine->qmlContext());
+    if (!qmlContext)
+        return QV4::Encode::undefined();
+
+    QObject *scopeObject = qmlContext->qmlScope();
+    if (scopeObject && QQmlData::wasDeleted(scopeObject))
+        return QV4::Encode::undefined();
+
+    Heap::Object *heapObject = l->qmlTypeLookup.qmlTypeWrapper;
+    if (static_cast<Heap::QQmlTypeWrapper *>(heapObject)->object != scopeObject) {
+        l->qmlTypeLookup.qmlTypeWrapper = nullptr;
+        l->qmlContextPropertyGetter = QQmlContextWrapper::resolveQmlContextPropertyLookupGetter;
+        return QQmlContextWrapper::resolveQmlContextPropertyLookupGetter(l, engine, base);
+    }
+
+    return Value::fromHeapObject(heapObject).asReturnedValue();
+}
+
 void Heap::QmlContext::init(QV4::ExecutionContext *outerContext, QV4::QQmlContextWrapper *qml)
 {
     Heap::ExecutionContext::init(Heap::ExecutionContext::Type_QmlContext);
diff --git a/src/qml/jsruntime/qv4qmlcontext_p.h b/src/qml/jsruntime/qv4qmlcontext_p.h
index 4c8287ef2f..e3e7239fe5 100644
--- a/src/qml/jsruntime/qv4qmlcontext_p.h
+++ b/src/qml/jsruntime/qv4qmlcontext_p.h
@@ -112,6 +112,7 @@ struct Q_QML_EXPORT QQmlContextWrapper : Object
     static ReturnedValue lookupContextObjectProperty(Lookup *l, ExecutionEngine *engine, Value *base);
     static ReturnedValue lookupInGlobalObject(Lookup *l, ExecutionEngine *engine, Value *base);
     static ReturnedValue lookupInParentContextHierarchy(Lookup *l, ExecutionEngine *engine, Value *base);
+    static ReturnedValue lookupType(Lookup *l, ExecutionEngine *engine, Value *base);
 };
 
 struct Q_QML_EXPORT QmlContext : public ExecutionContext