From: Matthias Puech <puech@cs.unibo.it>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Printexc.register_printer without catch
Date: Fri, 13 Apr 2012 11:43:17 +0200 [thread overview]
Message-ID: <4F87F535.8030705@cs.unibo.it> (raw)
In-Reply-To: <CAPFanBHoRdRH9=pjv3nszA6oiqS4O+0z5bU6BSHhExvHYG5onA@mail.gmail.com>
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Ok so it seems Printexc is not the way to go... Can you make sense out
of this sentence in catch's documentation then?
"This function is deprecated: the runtime system is now able to print
uncaught exceptions as precisely as|Printexc.catch|does"
In the toplevel, exceptions are printed in a sensible way, i.e. their
arguments is printed as far as it can go respecting abstract types:
# type t = A | B;;
# exception Bla of t;;
# raise (Bla A);;
Exception: Bla A.
Also it honors my #install_printer when printing arguments.
If I compile the same code, I get:
Fatal error: exception Exc.Bla(0)
It seems there is a very ad-hoc, type-unaware exception handler in
compiled code (byterun/printexc.c:caml_format_exception?) that can't be
changed and I was hoping Printexc would do that for me. It seems not;
so, no other way to change the global catcher?
Thanks,
-m
Le 04/13/2012 11:18 AM, Gabriel Scherer a écrit :
> It seems Printexc.register_printer affects the other Printexc.*
> functions, not the way the toplevel itself (or the runtime system more
> generally) handles uncaught exceptions.
>
> # Printexc.register_printer begin function Not_found -> Some "hello" |
> _ -> None end;;
> - : unit = ()
> # (fun () -> raise Not_found) ();;
> Exception: Not_found.
> # Printexc.print (fun () -> raise Not_found) ();;
> Uncaught exception: hello
> Exception: Not_found.
>
>
> On Fri, Apr 13, 2012 at 11:12 AM, Matthias Puech<puech@cs.unibo.it> wrote:
>> Hello,
>>
>> Is there a way to change printing of uncaught exceptions in the toplevel and
>> in (native/bytecode, 3.12) compiled code without wrapping the whole code in
>> a try ... with or in Printexc.catch?
>>
>> Printexc.catch's documentation says it is deprecated and that the runtime
>> system should be able to print exceptions the way they were registered with
>> Printexc.register_printer, yet
>>
>> # Printexc.register_printer begin function Not_found -> Some "hello" | _ ->
>> None end;;
>> # raise Not_found;;
>> Exception: Not_found.
>>
>> (* I would expect it to respond [Exception: hello] *)
>>
>> Do I miss something here?
>> Thanks in advance,
>> -m
>>
>> --
>> Caml-list mailing list. Subscription management and archives:
>> https://sympa-roc.inria.fr/wws/info/caml-list
>> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
>> Bug reports: http://caml.inria.fr/bin/caml-bugs
>>
>
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next prev parent reply other threads:[~2012-04-13 9:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-13 9:12 Matthias Puech
2012-04-13 9:18 ` Gabriel Scherer
2012-04-13 9:43 ` Matthias Puech [this message]
2012-04-13 9:52 ` Jérémie Dimino
2012-04-13 14:04 ` Matthias Puech
2012-04-13 9:33 ` Mark Shinwell
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