Re: [MirageOS-devel] Mirage/ARM plans

[Thomas Leonard <talex5@xxxxxxxxx>]

On 14 May 2014 15:26, Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx> wrote:
>> Note that when I refer to 'libc', I'm really talking about libm (which
>> is essential), a printf implementation, and malloc/calloc.
>
> Do we steel need the printf stuff for ocaml 4.02 with the new printf's GADTs 
> implementation ?

Good point. For now, it's using Mini-OS's printf functions. They
mostly work, but don't recognise %F, for example.

For malloc, Mini-OS provides a malloc that returns contiguous regions
of (guest) physical memory (it just calls _xmalloc(size,
DEFAULT_ALIGN)). If OCaml just grabs more memory whenever the heap is
full, that should be fine. If people are freeing stuff, it could
become a problem due to fragmentation.

For libm, does anyone have an opinion about openlibm?

  https://github.com/JuliaLang/openlibm

"OpenLIBM is an effort to have a high quality standalone LIBM library.
It is meant to be used standalone in applications and programming
language implementations.

OpenLibm builds on Linux, Mac OS X, and Windows, and with little
effort, should build on FreeBSD as well. It builds with both, GCC and
clang.

The OpenLIBM code derives from the FreeBSD msun implementation, which
in turn derives from FDLIBM 5.3. As a result, it has a number of fixes
and updates that have accumulated over the years in msun, and also
optimized assembly versions of many functions."

All the other standard libc functions are currently stubbed out and
either panic or return some suitable default value.


-- 
Dr Thomas Leonard        http://0install.net/
GPG: 9242 9807 C985 3C07 44A6  8B9A AE07 8280 59A5 3CC1
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