QML: Allow as-casting to value types

If the "Addressable" option to ValueTypeBehavior is set, you can use the
"as" operator to cast a previously unknown type into either undefined
or the given type. We can use this in qmlcachegen to generate efficient
code for further operations on the same type.

In the generated C++ it in fact only works for GetLookup because:
a, We generally don't do SetLookup on value types, yet.
b, We generally don't call methods on value types, yet.
c, We cannot store a union of undefined and a sequence type, yet.

However, getting properties of value types is the most important
application of the new casts so this is well worth it.

As a side effect we can also look up things in potentially undefined
results of other operations now. For example list lookups.

Task-number: QTBUG-94807
Change-Id: Ifdf34f1f3f67b7a0a8953b9ed0e947b74638a28c
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/qml/jsruntime/qv4qmlcontext.cpp b/src/qml/jsruntime/qv4qmlcontext.cpp
index 1cabf7c6c2..e585adfa5b 100644
--- a/src/qml/jsruntime/qv4qmlcontext.cpp
+++ b/src/qml/jsruntime/qv4qmlcontext.cpp
@@ -196,7 +196,7 @@ ReturnedValue QQmlContextWrapper::getPropertyAndBase(const QQmlContextWrapper *r
             return result->asReturnedValue();
     }
 
-    if (context->imports() && name->startsWithUpper()) {
+    if (context->imports() && (name->startsWithUpper() || context->valueTypesAreAddressable())) {
         // Search for attached properties, enums and imported scripts
         QQmlTypeNameCache::Result r = context->imports()->query<QQmlImport::AllowRecursion>(name);