diff options
author | Ulf Hermann <ulf.hermann@qt.io> | 2020-03-04 16:46:42 +0100 |
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committer | Ulf Hermann <ulf.hermann@qt.io> | 2020-03-18 16:35:02 +0100 |
commit | 748411fa64412db1650e04ee7b4405b8fbc53d42 (patch) | |
tree | a3c94175c04a8465cb602d4d4deb557a37c1923d /src/qml/jsruntime/qv4qmlcontext.cpp | |
parent | 7230005ef66f22a7ee3addff95b1e8d9060dc5a1 (diff) |
Store a QV4::ReturnedValue in QJSValue
Being careful, we can now save primitive values inline. We use the heap
pointer of QV4::Value as either QString* or QV4::Value* for complex
types. We cannot store persistent managed QV4::Value without the double
indirection as those need to be allocated in a special place.
The generic QVariant case is not supported anymore. The only place where
it was actually needed were the stream operators for QJSValue. Those
were fundamentally broken:
* A managed QJSValue saved and loaded from a stream was converted to a
QVariant-type QJSValue
* QVariant-type QJSValues were not callable, could not be objects or
arrays, or any of the special types.
* Cyclic references were forcibly broken when saving to a data stream.
In general the support for saving and loading of managed types to/from
a data stream was so abysmally bad that we don't lose much by dropping
it.
[ChangeLog][QML][Important Behavior Changes] When saving a QJSValue to a
QDataStream only primitive values or strings will be retained. Support
for objects and arrays was incomplete and unreliable already before. It
cannot work correctly as we don't necessarily have a JavaScript heap
when loading a QJSValue from a stream. Therefore, we don't have a proper
place to keep any managed values. Using QVariant to keep them instead is
a bad idea because QVariant cannot represent everything a QJSValue can
contain.
Fixes: QTBUG-75174
Change-Id: I75697670639bca8d4b1668763d7020c4cf871bda
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Diffstat (limited to 'src/qml/jsruntime/qv4qmlcontext.cpp')
-rw-r--r-- | src/qml/jsruntime/qv4qmlcontext.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/qml/jsruntime/qv4qmlcontext.cpp b/src/qml/jsruntime/qv4qmlcontext.cpp index e2d3b98ff6..4538900d21 100644 --- a/src/qml/jsruntime/qv4qmlcontext.cpp +++ b/src/qml/jsruntime/qv4qmlcontext.cpp @@ -241,7 +241,7 @@ ReturnedValue QQmlContextWrapper::getPropertyAndBase(const QQmlContextWrapper *r ).heapObject()); } else { QJSValue singleton = e->singletonInstance<QJSValue>(r.type); - QV4::ScopedObject o(scope, QJSValuePrivate::convertedToValue(v4, singleton)); + QV4::ScopedObject o(scope, QJSValuePrivate::asReturnedValue(&singleton)); lookup->qmlContextSingletonLookup.singleton = o->d(); } lookup->qmlContextPropertyGetter = QQmlContextWrapper::lookupSingleton; |