Crash in QDeclarativeCompiler::indexOfProperty

In QDeclarativePropertyCache, plain integer bitfield overrideIndex is
initialized with -1 in class constructor. Unfortunately, ARM compiler
treats bitfields as unsigned, unless explicitly defined as signed [1].
Therefore, overrideIndex actually gets initial value of 2147483647,
which causes array operations done with the index to fail.

As a fix, define overrideIndex as signed int bitfield.

[1] http://www.keil.com/support/man/docs/armccref/armccref_Babjddhe.htm
Under bitfields/Note: "A plain bitfield, declared without either
signed or unsigned qualifiers, is treated as unsigned"

Task-number: QT-5285
Reviewed-by: Aaron Kennedy

1 files changed, 1 insertions, 1 deletions

diff --git a/src/declarative/qml/qdeclarativepropertycache_p.h b/src/declarative/qml/qdeclarativepropertycache_p.h
index 581f519..c648d25 100644
--- a/src/declarative/qml/qdeclarativepropertycache_p.h
+++ b/src/declarative/qml/qdeclarativepropertycache_p.h
@@ -111,7 +111,7 @@ public:
             int relatedIndex; // When IsFunction
         };
         uint overrideIndexIsProperty : 1;
-        int overrideIndex : 31;
+        signed int overrideIndex : 31;
         int revision; 
         int metaObjectOffset;