Subj : Re: Notification when leaving a scope, and attaching custom data
To   : Benjamin D. Smedberg
From : Brendan Eich
Date : Sat Jun 26 2004 07:59 pm

Benjamin D. Smedberg wrote:
> I have been looking at the 
> netscape.security.PrivilegeManager.enablePrivilege() functionality, and 
> I'm trying to figure out how it is implemented within spidermonkey. This 
> function must keep "state" information about the currently active script 
> context, and presumably is notified when a script reaches the end of the 
> current block/function. Is this correct? What API does it use?


Excellent question.  In the 4.x codebase and JIT'ed JVMs, we had hooks 
to downgrade privileges on return from a Java method that had enabled. 
It used jsdbgapi.h, in particular JS_SetFrameAnnotation etc. 
(http://lxr.mozilla.org/mozilla/search?string=FrameAnnotation).

See also 
http://lxr.mozilla.org/mozilla/source/caps/src/nsPrincipal.cpp#418 and 
http://lxr.mozilla.org/mozilla/search?string=mAnnotations.

Cc'ing caillon.

/be

.