Initial support for resolving meta-property access for the scope and context objects at QML compile time

This avoids having to do a string lookup for ids and in the import cache at
run-time, before we can do a string hash lookup in the property cache. Instead
we resolve final properties in the context and scope object at compile time and
look them up at run-time using their index instead. The dependencies to these
properties are also tracked separately and recorded in the compiled data.

This is merely the initial patch. There's a lot left to do, such as having
specialized getter and setters for specific property types. Setters are missing
altogether right now and will fall back to name lookup.

Change-Id: If3cb4e7c9454ef4850a615f0935b311c9395b165
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/qml/compiler/qv4codegen_p.h b/src/qml/compiler/qv4codegen_p.h
index 369df712c5..f5cdd27efa 100644
--- a/src/qml/compiler/qv4codegen_p.h
+++ b/src/qml/compiler/qv4codegen_p.h
@@ -72,7 +72,10 @@ public:
         GlobalCode,
         EvalCode,
         FunctionCode,
-        QmlBinding
+        QmlBinding // This is almost the same as EvalCode, except:
+                   //  * function declarations are moved to the return address when encountered
+                   //  * return statements are allowed everywhere (like in FunctionCode)
+                   //  * variable declarations are treated as true locals (like in FunctionCode)
     };
 
     void generateFromProgram(const QString &fileName,
@@ -324,7 +327,7 @@ protected:
 
     V4IR::Expr *identifier(const QString &name, int line = 0, int col = 0);
     // Hook provided to implement QML lookup semantics
-    virtual V4IR::Expr *fallbackNameLookup(const QString &name, int line, int col) const;
+    virtual V4IR::Expr *fallbackNameLookup(const QString &name, int line, int col);
 
     // nodes
     virtual bool visit(AST::ArgumentList *ast);