Re: Lua reference re-use

[Nagaev Boris <bnagaev@...>]

On Thu, Jul 30, 2015 at 5:19 PM, Tim Perkins <tprk77@gmail.com> wrote:
> I've also struggled with luaL_ref and luaL_unref in the past. So I will try
> to help.
>
> These functions create a sort of linked list of free indexes, always
> starting at the zeroth element of the table.
>
> I would recommend writing your own functions, to meet your specific needs.
> The original functions are not too complicated, and you can find the source
> in "lauxlib.c". In your case it should be pretty easy because you can just
> use a monotonically increasing integer.

Good idea! This simple solution allows not only to detect
use-after-free bugs but also memory leaks (ref without unref).

Why the standard implementation reuses old references? To keep the
table in array form (rather than hash)?




-- 


Best regards,
Boris Nagaev