please help about garbage collector.

[alin soare]

/* When scanning the C stack for live Lisp objects, Emacs keeps track
   of what memory allocated via lisp_malloc is intended for what
   purpose.  This enumeration specifies the type of memory.  */

Could you explain me what kind of Lisp Objects are keps on the stack ? What kind
of Lisp objects are kept on the stack ?

Where and why such objects are allocated ?

Thanks.


Alin.