Re: C++ exception breaks inside Apple code
Re: C++ exception breaks inside Apple code
- Subject: Re: C++ exception breaks inside Apple code
- From: Jens Alfke <email@hidden>
- Date: Sat, 10 Oct 2009 11:44:43 -0700
On Oct 10, 2009, at 11:12 AM, Michael A. Crawford wrote:
Yeah, when I recompiled some CoreAudio code that worked flawlessly
in Leopard using Snow-Leopard my initial thought was that something
in CoreAudio got broke. Scared the he11 out of me until I realized
what was happening.
I used to file bug reports on this kind of thing, back when I was
still at Apple. Besides just the annoyance to C++ developers using the
framework, it's also bad for performance — the "zero overhead"
exception model assumes exceptions aren't thrown in normal usage, so
it's only 'try' that has zero overhead; when the 'throw' occurs the
runtime has to start loading in symbol tables and parsing its way up
the stack looking for 'catch' blocks, and that's very expensive.
—Jens _______________________________________________
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