Re: ways to avoid (or speed up) luaL_checkudata() in LuaJIT2?

[Mike Pall <mikelu-1011@...>]

Leo Razoumov wrote:
> On Sat, Nov 6, 2010 at 06:12, Mike Pall <mikelu-1011@mike.de> wrote:
> > [Actually the internal userdata methods in LuaJIT have a much
> > faster check, using a 16 bit udtype field in every userdata. See
> > io_tofilep() in lib_io.c. Alas, this mechanism is not available
> > for external methods and it might change anytime.]
> 
> what happens if 16 bit udtype field overflows?

This is for _internal_ userdata types of the LuaJIT core.
Currently there are exactly _two_ kinds: regular userdata (what
you get with lua_newuserdata) and file handles. I do not
anticipate to need more than a handful of these in the future.

--Mike