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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Exceptions: Are they GOTOs?
Date: 1996/07/15
Message-ID: <dewar.837404114@schonberg>#1/1
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references: <brad.837052481@ss1> <4s9o6e$ro4@news-e2b.gnn.com>
 <ws9logmtvtp.fsf@schonberg.cs.nyu.edu> <4sc7t2$m5g@news-e2b.gnn.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-07-15T00:00:00+00:00
List-Id: <comp.lang.ada>


Andy says

"This (the string message) sounds useful for debugging purposes, but it
seems to add a level of complexity to exceptions that would hurt
performance in a real time environment."

Not particularly, but then performance of *raising* an exception is not
something that can be counted on to be sparkling, in a real time
environment or otherwise. For example on the RS6000 the ABI specifies
a serial search of the code to find the exception table.

The whole idea of exceptions in Ada is to make them efficient when they
are NOT raised, if necessary at the expense of the behavior when they
*are* raised.