Re: Hacking into lj_meta_tset
- From: Coda Highland <chighland@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 6 Aug 2013 12:33:57 -0700
On Tue, Aug 6, 2013 at 12:25 PM, Emil Dotchevski
<emildotchevski@xxxxxxxxx> wrote:
> Hello,
>
> I need to modify Luajit to detect certain types of tables for which a C
> callback is called with the value rather than the value being stored into
> the table. In the original Lua, luaV_settable is given the value to store in
> the table. In Luajit, lj_meta_tset isn't, instead it returns a TValue
> pointer for the caller to copy the value into.
>
> I tried to add one more parameter to lj_meta_tset, to take in the value so
> it can pass it to the C function if it needs to, and in that case return
> &G(L)->tmptv so that the caller has a dummy place to copy the value into
> (ideally it should indicate to the caller that it doesn't have to do
> anything, but if I read the code correctly, returning NULL has different
> semantics).
>
> Luajit builds successfully but I get a NULL pointer passed as the cTValue*
> parameter I added to lj_meta_tset, which I'm reasonably sure is wrong. Is
> this because the assembly that calls lj_meta_tset doesn't know about the
> extra parameter I added? Is there a better way to achieve this?
>
> (Note again that this is a XBOX 360 project and JIT compilation is
> disabled.)
>
> Thanks,
> Emil
Why can't you do this Lua-side by assigning a cfunction to __index/__newindex?
/s/ Adam
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