From: Eli Zaretskii <eliz@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Why do emacs backtraces lack line numbers?
Date: Tue, 20 Dec 2022 21:34:25 +0200 [thread overview]
Message-ID: <83k02lc1j2.fsf@gnu.org> (raw)
In-Reply-To: <CAJnXXohPU9VTCPO4-4Jm7a-kfsaOCheacnFZrQcmCABRz1paow@mail.gmail.com> (message from John Yates on Tue, 20 Dec 2022 11:50:46 -0500)
> From: John Yates <john@yates-sheets.org>
> Date: Tue, 20 Dec 2022 11:50:46 -0500
>
> I am doing my first significant bit of coding in elisp.
>
> Relative to other environments that I have used, something
> that I miss sorely is line numbers in backtraces.
>
> What explains their absence?
The line information needs to be recorded somewhere, before it can be
presented. In compiled programs, for example, the compiler records
the line-number information in the debug info it generates.
None of this is present in Lisp, and moreover, until Emacs 29 the byte
compiler didn't even have a good idea of which line number it is
processing at any given time.
So I guess the simple answer is: because Emacs doesn't know.
prev parent reply other threads:[~2022-12-20 19:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-20 16:50 Why do emacs backtraces lack line numbers? John Yates
2022-12-20 18:56 ` Emanuel Berg
2022-12-20 19:34 ` Eli Zaretskii [this message]
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