Subj : Re: Reserving another slot for private data
To   : netscape.public.mozilla.jseng
From : Brendan Eich
Date : Thu Apr 22 2004 03:04 pm

Brendan Eich wrote:

>> The problem is that conversion to & from a jsval could drop the 
>> left-most bit in the pointer, which would be problematic. 
> 
> 
> 
> How so?  The jsval is a tagged pointer to the object, string, or double. 
>  The reserved slots you want are in each object's slots array.


Oh, I see what you mean.  You were worrying about tagging a pointer to 
private data.  That's what PRIVATE_TO_JSVAL is for.  It requires that 
the pointer is an even address.

/be

.