Re: Implementation of C++ exceptions ?

ssimmons@convex.com (Steve Simmons) writes:


      OK... I am going to take a couple of WAGs. First, exception
      handlers are defined to be active over a region of code (like
      PC=100 to PC=200). When an exception is raised within that region
      or code called within that region, the exception handler must be
      invoked....


      The only real bad costs for exception handling is that you cannot do many
      global/loop/interprocedural optimizations across the boundary of an
      exception region. Usually, that is not a big loss...


I thought the cost of exception handling in C++ was the need to stack
up the code which calls the destructors of automatic variables in all
active blocks when unwinding to the handler. I couldn't figure out if
David Chase's description eliminated this cost.


-- Harley Davis
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