[antlr-interest] Re: updated "antlr 2 bashing list"

[Anthony Youngman]

And no I am not suggesting we add PL/1 support ...

Exceptions are not handled consistently across languages. I think the
PL/1 mechanism is quite good (not that I've ever used PL/1 much), and
when a handler is invoked you basically get three choices - (1) fix the
problem and go back where you came from or (2) abort the program or (3)
"continue to signal" ie rethrow the exception and see if there's another
handler that can cope. That doesn't sound like Java-style to me at
all...

So really, what I'm saying, is that using exceptions is a bad idea. It's
bad enough restricting yourself to languages that support exceptions,
but you're restricting yourself to languages that support your kind of
exceptions. I'm a C / DATABASIC programmer by trade, neither of which
are OO languages, and I don't want to try for a paradigm shift only to
discover that my version of the new paradigm isn't supported :-)

Cheers,
Wol

-----Original Message-----
From: Ric Klaren [mailto:klaren at cs.utwente.nl] 
Sent: 10 March 2004 11:49
To: antlr-interest at yahoogroups.com
Subject: Re: [antlr-interest] Re: updated "antlr 2 bashing list"

On Tue, Mar 09, 2004 at 05:22:25PM -0800, Terence Parr wrote:
> > I hate to say it, but I think that that's a cop out.  Building
> > exception objects and stack frames costs, and there is no point when
> > in guessing mode.

Have to agree with Loring here.

> This never happens unless you fail and is a minor cost compared to the
> cost of nested predicates, right?

Well in C++ you can compile without exception support which gives you a
faster and smaller binary, people in the embedded business might like
that.
I'm not sure though wether I would support two versions of the
runtime...

> Doesn't bother me in Java, but other languages might be a drag.

The argument for retargeting to a exceptionless generated code would
also
make a C codegenerator an (easy) option. (Hmm wonder how far you'd get
with
longjmp and co. talk about ugly...)



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