FunctionObject: Mark name/length property configurable

In ES5, these were not configurable, but ES6 changed the behavior.

For length, refer to:
    9.2.4 (FunctionInitialize)
    17 (ECMAScript Standard Built-in Objects):
        Unless otherwise specified, the length property of a built-in Function
        object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
        [[Configurable]]: true }.
    19.2.2.1 Function.length
    19.2.3.2 (Function.prototype.bind)
    19.2.4.1 (Function instances, length)

For name, refer to:
    9.2.11 (SetFunctionName)

This does regress test262 for ES5 for me a little, but improves our es6 test
coverage a bit (~682 more tests pass, +1.5%).

Change-Id: Icda7c9068dc3e6e4e4aebbb0d359868a30343013
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4object_p.h b/src/qml/jsruntime/qv4object_p.h
index 6a543ae1a8..a54e09cdb2 100644
--- a/src/qml/jsruntime/qv4object_p.h
+++ b/src/qml/jsruntime/qv4object_p.h
@@ -253,6 +253,10 @@ struct Q_QML_EXPORT Object: Managed {
     void defineReadonlyProperty(const QString &name, const Value &value);
     void defineReadonlyProperty(String *name, const Value &value);
 
+    /* Fixed: Writable: false, Enumerable: false, Configurable: true */
+    void defineReadonlyConfigurableProperty(const QString &name, const Value &value);
+    void defineReadonlyConfigurableProperty(String *name, const Value &value);
+
     void insertMember(String *s, const Value &v, PropertyAttributes attributes = Attr_Data) {
         Scope scope(engine());
         ScopedProperty p(scope);