[M3devel] Alpha/OSF exception handling

[Jay K]

I didn't "remove" it, but I did "disable" it. Similar.
I didn't want to have to spend any time debugging it if it didn't work any longer.
I'm sure we have precious few users of this system (2 this month though, quite a surge) and they can probably live with
an equally bad implementation as all the other platforms (except for Solaris/sparc).
  Granted, they have slower than average systems, would benefit more perhaps from the optimization.

We can try it out I guess.

I do hope we can improve this across the aboard.
  Even if we don't use the tree exception handling nodes, we can probably at least use the same runtime support (libunwind in libgcc).
  Even then, Alpha/OSF won't be important.

 - Jay

----------------------------------------
> From: hosking at cs.purdue.edu
> Date: Sun, 18 Jul 2010 14:22:41 -0400
> To: jay.krell at cornell.edu
> CC: m3devel at elegosoft.com
> Subject: Re: [M3devel] Alpha/OSF exception handling
>
> That is a huge shame. Why did you remove it? It used to be there and functional.
>
> On 18 Jul 2010, at 09:35, Jay K wrote:
>
> >
> > Modula-3 for ALPHA_OSF historically had the best exception handling implementation.
> >
> > With Solaris/sparc32 second best.
> >
> > And then everything else equally bad.
> >
> >
> >
> >
> >
> > The current Alpha/osf is now in the "equally bad" category.
> > Because I'm lazy.
> >
> > It might be worth restoring its former glory.
> >
> >
> >
> > Maybe a small project for someone?
> >
> >
> > The code is still in there. I just tweaked the m3makefiles to avoid trying it.
> >
> >
> > jbook2:runtime jay$ pwd
> > /dev2/cm3/m3-libs/m3core/src/runtime
> > jbook2:runtime jay$ find ALPHA_OSF
> > ALPHA_OSF/m3makefile-old
> >
> > Renaming that m3makefile.
> >
> > Fiddling with this:
> >
> > book2:runtime jay$ grep STACK *
> > m3makefile:readonly HAS_STACK_WALKER = {
> > m3makefile:if defined("M3_USE_STACK_WALKER")
> > m3makefile: if M3_USE_STACK_WALKER and HAS_STACK_WALKER contains TARGET
> > m3makefile: if HAS_STACK_WALKER{TARGET}
> >
> >
> > and this:
> >
> >
> > jbook2:src jay$ pwd
> > /dev2/cm3/m3-sys/m3middle/src
> >
> >
> > book2:src jay$ grep -i _stack *m3
> > Target.m3: Has_stack_walker := FALSE;
> > Target.m3: Has_stack_walker := TRUE;
> >
> >
> > - Jay
> >
>