Hacking into lj_meta_tset
- From: Emil Dotchevski <emildotchevski@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 6 Aug 2013 12:25:51 -0700
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
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