Don't use empty values anymore to store internal freelists

Simply encode them as integers. That works just as well, and
allows removing the indexed empty values.

This is helpful, to swap the internal representations of undefined
and empty values, which in turn will simplify an implementation of
correct handling of uninitialized variables (through let/const).

Change-Id: I299f975d665309611d1b561f6a0c86b5ca15782a
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/qml/jsruntime/qv4sparsearray_p.h b/src/qml/jsruntime/qv4sparsearray_p.h
index 51869b259f..c1e50c8dcf 100644
--- a/src/qml/jsruntime/qv4sparsearray_p.h
+++ b/src/qml/jsruntime/qv4sparsearray_p.h
@@ -52,6 +52,7 @@
 //
 
 #include "qv4global_p.h"
+#include "qv4value_p.h"
 #include <QtCore/qlist.h>
 
 //#define Q_MAP_DEBUG
@@ -151,7 +152,7 @@ struct Q_QML_EXPORT SparseArray
 
     SparseArray(const SparseArray &other);
 
-    ReturnedValue freeList;
+    Value freeList;
 private:
     SparseArray &operator=(const SparseArray &other);