From 4909773f8162de49830d65e886747c11fff72934 Mon Sep 17 00:00:00 2001
From: Lars Knoll <lars.knoll@qt.io>
Date: Tue, 20 Mar 2018 12:46:58 +0100
Subject: [PATCH 29/29] Fix calling Qt.binding() on bound functions
Calling Qt.binding() on a bound function object is a valid use
case and used to work until Qt 5.8.
The problem was that we optimized the code in QQmlBinding and
QQmlJavascriptExpression to directly work on a QV4::Function,
so this wouldn't work anymore.
To fix this make sure recursive calls to Function.bind() are
unrolled (so that the BoundFunction's target is never a bound
function itself), then add the bound function as an optional
member to the QQmlBinding and use it's bound arguments if
present.
Task-number: QTBUG-61927
Change-Id: I472214ddd82fc2a1212efd9b769861fc43d2ddaf
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
---
src/qml/jsruntime/qv4qobjectwrapper.cpp | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qml/jsruntime/qv4qobjectwrapper.cpp b/src/qml/jsruntime/qv4qobjectwrapper.cpp
index c1bbe2a33..816c259b9 100644
--- a/src/qml/jsruntime/qv4qobjectwrapper.cpp
+++ b/src/qml/jsruntime/qv4qobjectwrapper.cpp
@@ -460,9 +460,12 @@ void QObjectWrapper::setProperty(ExecutionEngine *engine, QObject *object, QQmlP
QV4::Scoped<QQmlBindingFunction> bindingFunction(scope, (const Value &)f);
+ QV4::ScopedFunctionObject f(scope, bindingFunction->bindingFunction());
QV4::ScopedContext ctx(scope, bindingFunction->scope());
- newBinding = QQmlBinding::create(property, bindingFunction->function(), object, callingQmlContext, ctx);
+ newBinding = QQmlBinding::create(property, f->function(), object, callingQmlContext, ctx);
newBinding->setSourceLocation(bindingFunction->currentLocation());
+ if (f->isBoundFunction())
+ newBinding->setBoundFunction(static_cast<QV4::BoundFunction *>(f.getPointer()));
newBinding->setTarget(object, *property, nullptr);
}
}
--
2.14.3