[LispM-Hackers] Error handling

[John Morrison]

Hi;

On Sunday 08 April 2001 05:14, James A. Crippen wrote:
> I'm working out on paper a good method for handling errors after realizing
> that my first attempt isn't going to be very scalable and isn't really in
> the OO spirit.

It will certainly be less trouble to implement upon bare iron than...

> Instantiated objects are exceptions to be thrown.  Exceptions are passed
> upwards until they are caught, perhaps at the top level.

If we use C++ exception-handling, then things will get really, really, really 
hard to port to bare iron.  I *very* briefly looked into using exceptions on 
bare iron for the JOS project, but it seemed to require either a lot of 
house-keeping and/or sucking in a whole bunch of LGPL'ed code and tweaking it 
(hey, we're not running on a POSIX platform any longer) which would've 
tripped the hard GPL.  So, I punted.

Even setjmp/longjmp would be easier.

I know nobody but me seems to care about a bare iron port, and I am willing 
to forego such a port for the nonce, but this is going to create work for me 
(or whoever tries a similar thing).

-jm

-- 
==== John Morrison
==== MAK Technologies Inc.
==== 185 Alewife Brook Parkway, Cambridge, MA 02138
==== http://www.mak.com/
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==== jm@mak.com