Improve memory usage of Connections and signal handlers.

Following the pattern of 330152354aed8496ac78d145e14b25ee2d7bf8fb, store
the source as Utf8. Keep one less copy of the source when possible.

Change-Id: Ifa5f5fdc9ea3d48e904489dc262145eff36e710c
Reviewed-by: Chris Adams <christopher.adams@nokia.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/src/qml/qml/qqmlboundsignal_p.h b/src/qml/qml/qqmlboundsignal_p.h
index a81060021c..f9159ee70f 100644
--- a/src/qml/qml/qqmlboundsignal_p.h
+++ b/src/qml/qml/qqmlboundsignal_p.h
@@ -83,7 +83,7 @@ public:
     QString sourceFile() const { return m_fileName; }
     int lineNumber() const { return m_line; }
     int columnNumber() const { return m_column; }
-    QString expression() const { return m_expression; }
+    QString expression() const;
 
     QQmlEngine *engine() const { return context() ? context()->engine : 0; }
 
@@ -93,8 +93,12 @@ private:
     v8::Persistent<v8::Object> m_v8qmlscope;
     v8::Persistent<v8::Function> m_v8function;
 
-    QString m_expression;
-    QString m_functionName; // hint for debugger
+    //either expressionUtf8 or expression will be used (but not both).
+    //once m_v8function is valid, we clear both expressions, and
+    //extract it from m_v8function if needed.
+    QByteArray m_expressionUtf8;
+    QString m_expression;   //only used when expression needs to be rewritten
+
     QString m_fileName;
     int m_line;
     int m_column;