Re: exceptions ( static analysis possible? )

"steve (s.s.) simmons" <simmons@bnr.ca>
Mon, 31 Jul 1995 13:30:15 GMT

          From comp.compilers

Related articles
Implementation and Optimization of exceptions ( static analysis possi sdm7g@elvis.med.virginia.edu (Steven D. Majewski) (1995-07-21)
Re: Implementation and Optimization of exceptions ( static analysis p bobduff@world.std.com (1995-07-26)
Re: exceptions ( static analysis possible? ) simmons@bnr.ca (steve (s.s.) simmons) (1995-07-31)
Re: exceptions ( static analysis possible? ) bill@amber.ssd.hcsc.com (1995-08-13)
| List of all articles for this month |

Newsgroups: comp.compilers
From: "steve (s.s.) simmons" <simmons@bnr.ca>
Keywords: errors, optimize
Organization: Bell-Northern Research Ltd.
References: 95-07-142 95-07-161
Date: Mon, 31 Jul 1995 13:30:15 GMT

> The usual technique in Ada compilers has near-zero overhead for entering
> a procedure/block with a handler, and lots of overhead for actually
> raising an exception. This is good if exceptions are used for truly
> exceptional situations. The technique is to keep a static table for
> each procedure, which maps ranges of code addresses to the corresponding
> exception handler.


Certainly, you are right in the case with no optimizations. However,
Ada's exception blocks do have a subtle. That is, you can't optimize
across a exception block boundary in Ada when doing any global
optimizations. It is a subtle, but important issue...


Thank you.


Steve Simmons


--


Post a followup to this message

Return to the comp.compilers page.
Search the comp.compilers archives again.