Re: Beta10: some issues on Efika/ARM
- From: Ignacio Burgueño <iburgueno@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Thu, 10 May 2012 13:24:02 -0300
On Thu, May 10, 2012 at 12:03 PM, Mike Pall <mike-1205@xxxxxxxxxx> wrote:
> Ignacio Burgueño wrote:
> > On a similar note, that same code on Win x64 gives an error message may
> be
> > a bit misleading.
> >
> > LuaJIT 2.0.0-beta10 -- Copyright (C) 2005-2012 Mike Pall.
> http://luajit.org/
> > JIT: ON CMOV SSE2 SSE3 SSE4.1 fold cse dce fwd dse narrow loop abc fuse
> >
> > stdin:1: attempt to call global 'tostring' (a string value)
> > stack traceback:
> > stdin:1: in main chunk
> > [C]: ?
>
> Well, yes. That's a consequence of tostring() tail-calling the
> __tostring metamethod (i.e. the string value). The variable name
> derived by the error handler points to tostring as the culprit. In
> general, you may get strange errors when tail calls come into play.
Ah, I see. Thanks for the clarification.
It seems that not only tail calls but metamethods may give strange errors.
I wasn't aware of the following in plain Lua:
> t = setmetatable({}, { __add = "not a function" })
> print(type(t))
table
> print(t + 1)
attempt to call a string value
stack traceback:
stdin:1: in main chunk
[C]: ?
Regards,
Ignacio
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