Re: Ada: A beginners experience

[Simon Wright <simon@pushface.org>]

Jere <jhb.chat@gmail.com> writes:

> However, there are definitely things in Ada that are costly.  Tasks
> and Protected objects are a big one.  Full exception handling
> capability is another.  I haven't been able to get Finalization
> working (haven't tried hard honestly), so I cannot comment on that
> one.

Tasking and POs were my main problem in Cortex GNAT RTS[1], not so much
the actual tasking/sychronization, which I delegate to FreeRTOS, so much
as the interface between the compiler and the RTS, and the way it
changes between different releases, see [2].

Exception handling is something I haven't even attempted (after one look
at the work GNAT has to do). See [3], espectially the Robert Dewar quote
at the end - "exceptions are a huge pain in the neck to implement".

Finalization is something I've actually implemented, but it's still in a
branch because of binder problems, now nearly resolved in GCC8/GNAT CE
2018 (the binder generates incorrect code if your code doesn't use the
secondary stack!! [4])

[1] https://github.com/simonjwright/cortex-gnat-rts
[2]
https://github.com/simonjwright/cortex-gnat-rts/blob/master/INSTALL.md
[3]
https://github.com/simonjwright/cortex-gnat-rts/wiki/ExceptionHandling
[4] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85380