On 7/30/10, Bogdan Marinescu <
[hidden email]> wrote:
> > I guess I should introduce myself: I'm porting eLua to a new avr32
> > platform with 128KB of flash. The good news is that it *does* still
> > fit in 128KB, just, but only if all BUILD_ options and all ROM modules
> > are disabled, so apart from the porting, I'll be focussing on various
> > ways of reducing the static code size so that I can enable some of the
> > modules we will be needing.
>
> Excellent news. Some ideas:
>
> - do you require the compiler? if no, you can build the image without
> the Lua compiler (which is fine if you just need to execute bytecode).
> There's no explicit support in eLua for this, but look in a standard
> Lua 5.1.4 source distribution at etc/noparser.c for a good starting
> point.
That's a very interesting idea, though we were hoping to allow people
simply to write a Lua program on an SD card, put it in and have it
work.
> - do you need floating point in eLua? If not, you can try to compile
> in integer mode (lualong). Not sure if this will save much space
> though.
It saves 44592 bytes of code and 44 of initialized data.
> - do you feel brave? :) If so, you can start re-writing the C library :)
Thanks! :)
The current low-hanging fruit i see is the large number of strings in
the binary, including 5KB of sys_errlist[], easily dropped by
providing a dummy strerror() function, and lots of verbose syntax
error messages in src/lua/ldebug.c. However, I am reluctant to change
the src/lua section, since that makes it more difficult to follow the
upstream sources. I might try ripping out the debug-hooks interface,
if that is possible without breaking the interpreter.
> And finally, something that I'd like you to check since you're going
> this route: can you please try and see if eLua compiles under AVR32
> without libm (remove -lm from the link options) if you don't include
> the Lua math library?
I can't see where to do that in the source (the only -lm I see is when
linking the native cross-compiler in cross-lua.py) but I just ran the
final "avr32-gcc -l elua-lualong-* ..." command without the -lm and it
links fine giving the same output file - tested with atevk1100 with
its usual selection of modules and ROM libraries.
Thanks again
M
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