Re: [rfc breakpoint] Catch exceptions

[Daniel Jacobowitz <drow at mvista dot com>]

On Tue, Mar 25, 2003 at 03:51:32PM -0800, Jim Ingham wrote:
> One thing we had to worry about at least on Mac OS X is that we don't 
> use a shared libstdc++, rather every shlib that uses C++ get its own 
> copy of all the libsupc++ code.  So there are actually many copies of 
> __cxa__begin_catch hanging around.  To do this properly, you have to 
> search exhaustively for these symbols, not just take the first hit.  
> Moreover, you have to redo it on every shared library load, or you will 
> miss some.  This still might bite you on other systems, for instance if 
> out of paranoia somebody had linked their shlib or executable 
> statically to libstdc++.a (so they wouldn't get bit by changing ABI 
> issues or whatever).
> 
> BTW. The more general problem of a symbol resolving to multiple 
> instances - for instance setting file:line breakpoints in inlined 
> functions or template method defn's - is something we need to address.  
> It really ticks off our C++ friends.  I thought I was going to have 
> time to think about this in the next month or two, but I got 
> sidetracked on other issues.  But I will need to get back to it after 
> our WWDC (in June).

Yes.  Rather than focusing on it with a special hack here, I'd rather
eventually address it properly.  Thanks for pointing this out.

> I thought from some comments in other notes that this was something you 
> were thinking about as well, Daniel.  Is that true?

I'm interested in the problem, but like everyone I have a dreadful
shortage of time :(


-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer