From: Eli Zaretskii <eliz@gnu.org>
To: Pip Cet <pipcet@gmail.com>, Stefan Monnier <monnier@iro.umontreal.ca>
Cc: chuntaro@sakura-games.jp, 34757@debbugs.gnu.org
Subject: bug#34757: Invalid bytecode from byte compiler
Date: Fri, 15 Mar 2019 10:08:12 +0200 [thread overview]
Message-ID: <838sxg1rwz.fsf@gnu.org> (raw)
In-Reply-To: <CAOqdjBcTM6Z5KYLeFj=wiX2DvB57wGn1uZL96Gqr=fGtXNAQ=A@mail.gmail.com> (message from Pip Cet on Fri, 8 Mar 2019 21:13:37 +0000)
> From: Pip Cet <pipcet@gmail.com>
> Date: Fri, 8 Mar 2019 21:13:37 +0000
> Cc: 34757@debbugs.gnu.org
>
> On Tue, Mar 5, 2019 at 3:30 PM chuntaro <chuntaro@sakura-games.jp> wrote:
> >
> > Invalid bytecode is output and error occurs when executed.
>
> If I'm looking at this correctly, the problem is that the byte code
> which is generated in an intermediate step:
>
> 0 constant 2
> 1 constant print
> 2 constant 1
> 3 call 1
> 4 discard
> 5 constant 3
> 6 return
>
> is considered a "trivial function" by byte-compile-out-toplevel, which
> assumes that all values on the stack are used by the call.
>
> We could fix byte-compile-out-toplevel to properly analyze how many
> stack arguments the call takes, but this patch simply treats forms
> like this as nontrivial:
>
> diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
> index 0b8f8824b4c..4e54e08ce14 100644
> --- a/lisp/emacs-lisp/bytecomp.el
> +++ b/lisp/emacs-lisp/bytecomp.el
> @@ -3025,6 +3025,7 @@ byte-compile-out-toplevel
> (or (null (cdr rest))
> (and (memq output-type '(file progn t))
> (cdr (cdr rest))
> + (eql (length body) (cdr (car rest)))
> (eq (car (nth 1 rest)) 'byte-discard)
> (progn (setq rest (cdr rest)) t))))
> (setq maycall nil) ; Only allow one real function call.
Stefan, any comments?
next prev parent reply other threads:[~2019-03-15 8:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-05 8:01 bug#34757: Invalid bytecode from byte compiler chuntaro
2019-03-08 13:18 ` Eli Zaretskii
2019-03-08 13:50 ` Michael Heerdegen
2019-03-08 14:36 ` Eli Zaretskii
2019-03-08 21:13 ` Pip Cet
2019-03-15 8:08 ` Eli Zaretskii [this message]
2019-03-15 14:08 ` Stefan Monnier
2019-03-15 19:40 ` Pip Cet
2019-03-15 20:30 ` Stefan Monnier
2019-03-16 16:51 ` Pip Cet
2019-06-13 11:44 ` Pip Cet
2019-07-27 21:30 ` Stefan Monnier
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