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- Subject: Re: Lua Needs
- From: Tim Hill <drtimhill@...>
- Date: Sat, 1 Dec 2018 11:02:03 -0800
> On Dec 1, 2018, at 7:51 AM, Dirk Laurie <dirk.laurie@gmail.com> wrote:
>
> Op Sa. 1 Des. 2018 om 17:08 het Philippe Verdy <verdy_p@wanadoo.fr> geskryf:
>
>> If there's something to do to the Lua engine is to rework the way upvalues are allocated: they should be on the call stack as much as possible (e.g. for up to ~250 upvalues) and not on the heap.
>
> The way I understand it, upvalues are not on the heap. They are on the
> main execution stack below the bottom of the current function's stack
> frame.
>
My understanding was they start that way, but if the owning function exits they are migrated to a distinct structure to lift them “out” of the stack frame that is being discarded. Something like that Roberto probably winced since its been a while since I looked at his paper in this subject.
—Tim
