This is the mail archive of the
gdb@sources.redhat.com
mailing list for the GDB project.
Re: TRY_CATCH()
- From: Kris Warkentin <kewarken at qnx dot com>
- To: Andrew Cagney <ac131313 at redhat dot com>
- Cc: gdb at sources dot redhat dot com
- Date: Thu, 13 Jan 2005 14:52:05 -0500
- Subject: Re: TRY_CATCH()
- References: <41E5BBE0.8000604@redhat.com>
Andrew Cagney wrote:
PS: I recall this being proposed years ago, but the mechanism proposed
at the time had a more cumbersom syntax, from memory something like:
TRY_BEGIN
... do stuff ...
TRY_END;
I saw something similar to this that worked really well but was not
quite as generic. Basically you would have to add a 'TryStack' member
to whatever data structure you were planning to capture exceptions on.
The TryStack was a stack of jmp_bufs. Then you'd do something like
if((error = TRY(mystruct)) == 0){
do_stuff(mystruct);
TRY_END(mystruct->try_stack);
}
else{
CATCH(mystruct, error);
handle_error();
}
The TRY would push a new jmp_buf onto the TryStack and the TRY_END and
CATCH would pop one. The various macros would be like #define TRY(foo)
is try_push(foo->try_stack) and so on. It's actually quite clever: If
something THROWs, it also pops but CATCH only pops if the error value is
zero so that you can have multiple tries and catches on a single block.
Anyway, interesting stuff.
cheers,
Kris