Re: Lua and Sol2 on Embedded Target?

[Philipp Janda <siffiejoe@...>]

Am 25.10.19 um 04:41 schröbte Russell Haley:
> Hello,

Hi!

> So, now comes the torrent of questions:
> - Has anyone used Lua with Keil?

I haven't, but it seems llvm/clang based with complete c++14 support, so 
you should be fine.

> - Has anyone used Sol2 with Keil? (And would the wise and mysterious
> Phantom Derp Storm support it?)

Same.

However, you can't completely disable exceptions when using Sol2, so you 
should check whether exceptions are already enabled in your code base.

> - With 1 Mb of Ram at my disposal, how much of Lua would be wise to put on
> the target?

1 Mb RAM is plenty. You should go for 32 bit ints and floats though, 
because this will halve your memory needs (pointers are 32 bit, too), 
and you probably don't have 64bit float hardware anyway. Coroutines are 
expensive, btw.

> - Given the prior question, should I bother interpreting on the PC host?
> - The Sol2 single file is 800Kb. Can Sol2 be chopped down? How small? What
> would be wise?

This is templated source code. Most of it won't end up in your image anyway.

> - Has anyone ever shipped byte code across a serial port? How bad an idea
> do you think that is?

You will need a custom luac on the host side (which is a constant source 
of error and confusion if you have native Lua installed as well), and 
you can forget sandboxing on the embedded device. The parser is not that 
big, so I wouldn't bother.

> Cheers,
> Russ


Philipp