1 files changed, 40 insertions, 1 deletions
diff --git a/src/declarative/qml/qmlengine.cpp b/src/declarative/qml/qmlengine.cpp
index 4be5230..2ea1bee 100644
--- a/src/declarative/qml/qmlengine.cpp
+++ b/src/declarative/qml/qmlengine.cpp
@@ -700,7 +700,8 @@ QObject *qmlAttachedPropertiesObjectById(int id, const QObject *object, bool cre
 }
 
 QmlDeclarativeData::QmlDeclarativeData(QmlContext *ctxt)
-: context(ctxt), bindings(0), outerContext(0), lineNumber(0), columnNumber(0), deferredComponent(0),
+: context(ctxt), bindings(0), bindingBitsSize(0), bindingBits(0), 
+  outerContext(0), lineNumber(0), columnNumber(0), deferredComponent(0), 
   deferredIdx(0), attachedProperties(0)
 {
 }
@@ -723,9 +724,47 @@ void QmlDeclarativeData::destroyed(QObject *object)
         binding = next;
     }
 
+    if (bindingBits)
+        free(bindingBits);
+
     delete this;
 }
 
+bool QmlDeclarativeData::hasBindingBit(int bit) const
+{
+    if (bindingBitsSize >= bit) 
+        return bindingBits[bit / 32] & (1 << (bit % 32));
+    else
+        return false;
+}
+
+void QmlDeclarativeData::clearBindingBit(int bit)
+{
+    if (bindingBitsSize >= bit) 
+        bindingBits[bit / 32] &= ~(1 << (bit % 32));
+}
+
+void QmlDeclarativeData::setBindingBit(QObject *obj, int bit)
+{
+    if (bindingBitsSize < bit) {
+        int props = obj->metaObject()->propertyCount();
+        Q_ASSERT(bit < props);
+
+        int arraySize = (props + 31) / 32;
+        int oldArraySize = bindingBitsSize / 32;
+
+        bindingBits = (quint32 *)realloc(bindingBits, 
+                                         arraySize * sizeof(quint32));
+        memset(bindingBits + oldArraySize, 
+               sizeof(quint32) * (arraySize - oldArraySize),
+               0x00);
+
+        bindingBitsSize = arraySize * 32;
+    }
+
+    bindingBits[bit / 32] |= (1 << (bit % 32));
+}
+
 /*!
     Creates a QScriptValue allowing you to use \a object in QML script.
     \a engine is the QmlEngine it is to be created in.