Re: GC and stack marking

[Paul Eggert]

On 05/19/2014 09:31 AM, Eli Zaretskii wrote:
> is it possible that a Lisp object which is no longer referenced by anything 
> won't be GC'ed because it is marked by mark_stack due to some kind of 
> coincidence?

Yes.  Normally Emacs uses a conservative approach, which means it 
occasionally does not collect something that is in fact garbage.  See, 
for example, 
<https://www.gnu.org/software/guile/manual/html_node/Conservative-GC.html>.

> how can we make sure this hash-table indeed gets GC'd before we dump Emacs?

We could have the garbage collector treat purify-flag specially, I suppose.