On Sep 25, 2013, at 10:16 AM, Kyle Sluder <k...@ksluder.com> wrote:

> Please note that the breakpoint traps on exception *throw*. It is perfectly 
> valid—daresay common—for C++ code to throw and catch exceptions as a normal 
> matter of course.

Some of the system code does it, yeah; I know the innards of the Security 
framework do. But it’s widely considered bad design to use exceptions for 
normal flow control. It’s also expensive — modern “zero-overhead” exception 
runtimes make ‘try’ blocks very cheap but at the overhead of making ‘throw’ 
very slow.

Anyway, as you said, the fix is to make your All Exceptions breakpoint 
ObjC-only. I’ve seen almost no system code that throws and internally catches 
Obj-C exceptions, although it might arise in code that uses DO or XPC.

—Jens
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