Subj : Re: Enumerating standard class properties & methods
To   : Sterling Bates <sterlingb@bigbangmapsonco.com>
From : Brendan Eich <brendan@meer.net>
Date : Wed Dec 17 2003 11:21 am

Sterling Bates wrote:

> That's cool.  Do you know of a way to obtain the memory address for a given
> class declaration (like Date) so I can check it from outside the engine?

Why do you need that?  Is this related to enumerating the global object 
to include all [[DontEnum]] properties?

If you really need to know the JSClass* for the Date class, you'll have 
to do something like this:

     JSBool ok;
     static const char date_proto_str[] = "Date.prototype";
     jsval rval;
     JSClass *date_class;

     ok = JS_EvaluateScript(cx, global,
                            date_proto_str, sizeof date_proto_str - 1,
                            NULL, 0,
                            &rval);
     if (!ok)
         fail somehow;

     date_class = JS_GET_CLASS(cx, JSVAL_TO_OBJECT(rval));

If you really need a Date API, there are some functions in jsdate.h that 
are marked JS_FRIEND_API, which means they're not frozen as solid as the 
JS_PUBLIC_API functions prototyped in jsapi.h -- but OTOH they haven't 
changed in years.

If you need other class pointers or APIs, let me know.

/be

.