From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Dynamic modules: emacs-module.c and signaling errors
Date: Fri, 27 Nov 2015 11:29:31 -0500 [thread overview]
Message-ID: <jwvmvtztnpw.fsf-monnier+Inbox@gnu.org> (raw)
In-Reply-To: <8337vrsae8.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 27 Nov 2015 17:57:19 +0200")
>> So you're saying that if I call a command which internally calls
>> a C module function which turn does "env->funcall" on some Elisp code
>> which then signals an error, I'll be throw into the *Backtrace* buffer
>> (after setting debug-on-error and not debug-on-signal) right at the
>> point where the error is really signaled (i.e. before returning to the
>> module's C code), and not later on when it is rethrown by the module
>> code?
> Yes:
> emacs -Q
> M-x load-file RET modules/mod-test/mod-test.dll
> M-: (mod-test-string-a-to-b (string-match "a" nil) "b") RET
> =>
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
> string-match("a" nil)
> (mod-test-string-a-to-b (string-match "a" nil) "b")
> eval((mod-test-string-a-to-b (string-match "a" nil) "b") nil)
> elisp--eval-last-sexp(nil)
> eval-last-sexp(nil)
> funcall-interactively(eval-last-sexp nil)
> call-interactively(eval-last-sexp nil nil)
> command-execute(eval-last-sexp)
Hmm... that's not the case I'm talking about: here the string-match is
called before even entering the module's code, so the module code is not
involved at all.
>> >> The core provides naturally a plain raw non-catching funcall, but with
>> >> the current design a module author who wants this behavior can't have it
>> > Why would a module author want a non-catching funcall?
>> Why not?
> Sorry, "why not" is not an answer.
Given then 271-vs-15 rather of non-catching funcalls vs catching
funcalls in Emacs's C code, I think it's pretty clear that it can be
very useful. So really the question is the other way around: what makes
you think that the modules's code will be so vastly different that it
won't want a non-catching funcall, contrary to the experience so far?
Stefan
next prev parent reply other threads:[~2015-11-27 16:29 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-24 19:41 Dynamic modules: emacs-module.c and signaling errors Eli Zaretskii
2015-11-24 19:45 ` Eli Zaretskii
2015-11-24 20:12 ` Tom Tromey
2015-11-24 20:49 ` Eli Zaretskii
2015-11-24 21:34 ` Paul Eggert
2015-11-24 21:55 ` Daniel Colascione
2015-11-25 6:52 ` Paul Eggert
2015-11-25 7:03 ` Daniel Colascione
2015-11-25 7:14 ` Paul Eggert
2015-11-25 7:18 ` Daniel Colascione
2015-11-25 7:23 ` Paul Eggert
2015-11-25 7:25 ` Daniel Colascione
2015-11-25 7:49 ` Paul Eggert
2015-11-25 7:52 ` Daniel Colascione
2015-11-25 7:58 ` Paul Eggert
2015-11-25 8:12 ` Daniel Colascione
2015-11-25 8:24 ` Paul Eggert
2015-11-25 8:50 ` Daniel Colascione
2015-11-25 9:11 ` Daniel Colascione
2015-11-25 18:19 ` Eli Zaretskii
2015-11-25 18:26 ` Philipp Stephani
2015-11-25 19:19 ` Eli Zaretskii
2015-11-25 21:52 ` Philipp Stephani
2015-11-25 17:34 ` Paul Eggert
2015-11-24 22:21 ` Tom Tromey
2015-11-25 6:55 ` Paul Eggert
2015-11-25 17:30 ` Eli Zaretskii
2015-11-25 17:34 ` Paul Eggert
2015-11-25 21:23 ` Stefan Monnier
2015-11-26 15:42 ` Eli Zaretskii
2015-11-26 16:36 ` Stefan Monnier
2015-11-26 17:08 ` Eli Zaretskii
2015-11-26 19:28 ` Stefan Monnier
2015-11-26 19:34 ` Eli Zaretskii
2015-11-26 20:11 ` Stefan Monnier
2015-11-26 20:19 ` Eli Zaretskii
2015-11-26 21:20 ` Paul Eggert
2015-11-26 22:29 ` Philipp Stephani
2015-11-26 22:33 ` Philipp Stephani
2015-11-27 1:06 ` Stefan Monnier
2015-11-27 1:10 ` Daniel Colascione
2015-11-27 15:06 ` Stefan Monnier
2015-11-27 8:12 ` Eli Zaretskii
2015-11-27 9:11 ` Eli Zaretskii
2015-11-27 12:25 ` Aurélien Aptel
2015-11-27 14:44 ` Eli Zaretskii
2015-11-28 23:31 ` Paul Eggert
2015-11-27 1:21 ` Stefan Monnier
2015-11-27 8:26 ` Eli Zaretskii
2015-11-27 15:15 ` Stefan Monnier
2015-11-27 15:57 ` Eli Zaretskii
2015-11-27 16:29 ` Stefan Monnier [this message]
2015-11-27 17:38 ` Eli Zaretskii
2015-11-27 17:54 ` Stefan Monnier
2015-11-25 18:10 ` Tom Tromey
2015-11-25 18:15 ` Eli Zaretskii
2015-11-25 18:09 ` Philipp Stephani
2015-11-25 21:19 ` Stefan Monnier
2015-11-26 15:41 ` Eli Zaretskii
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