Re: poll on luac

[Kein-Hong Man <mkh@...>]

Luiz Henrique de Figueiredo wrote:
> [snip]
> I'm convinced that the best route to byte order or cross-compiling is
> third-party dump/undump pairs. The files ldump.c and lundump.c are
> completely replaceable; they export a single, well-defined, entry point.
> The format of precompiled chunks is not sacred at all; you can use any
> format, as long as ldump.c and lundump.c agree about it. (For instance,
> Rici Lake is considering writing a text format for precompiled chunks.)
> For the Lua core, I prefer a simple and fast one. For cross-compiling,
> it should be simple to change ldump.c for instance. We just have to wait
> till someone writes it and makes it available.

It doesn't appear to be that trivial. Here is my list:
(a) change values of some opcodes, operand encoding order, 
encoding of RK
(b) LFIELDS_PER_FLUSH has changed, so I believe table 
initialization code will need fixing
(c) the meaning of OP_SETLIST changed, and OP_SETLISTO's 
functionality has been folded into OP_SETLIST
(d) OP_NEWTABLE's hash operand need to be recalculated
(e) optionally add OP_FORPREP to replace the subtract stuff
(f) take out OP_TFORPREP and warn the user
(g) not sure if I need to do anything with OP_VARARG...
(h) various changes to binary chunk header format (chunk header, 
prototype header), warnings and checks for non-standard sizes

I currently maintain 5.0.2 and 5.1wk binary chunk disassemblers 
separately; good cross compiling between them will definitely need 
a bit of work...

--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia