GNU bug report logs - #67141
30.0.50; Missing element in the backtrace

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; Missing element in the backtrace
Date: Sun, 12 Nov 2023 17:29:27 -0500

Package: Emacs
Version: 30.0.50


    emacs -Q
    (this is an unquoted list)
    C-j

Gives me:

    Debugger entered--Lisp error: (void-function this)
      (this is an unquoted list)
      (progn (this is an unquoted list))
      elisp--eval-last-sexp(t)
      eval-last-sexp(t)
      eval-print-last-sexp(nil)
      funcall-interactively(eval-print-last-sexp nil)
      command-execute(eval-print-last-sexp)

But `elisp--eval-last-sexp` doesn't directly run that `progn`.
Instead it calls `eval` to do so.  Where did `eval` go?

I see this both in Debian's Emacs-28,2 as well as on `master`.
In both cases, this is using the native compiler.
I have a local Emacs with various patches but without using the native
compiler and the problem doesn't appear there.
So my crystal ball pointed their pointy finger at the native code compiler.


        Stefan


 In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw3d scroll bars) of 2023-11-07 built on pastel
Repository revision: 62182311c1eb8b13a090b528e35f4f54dd9ca7f7
Repository branch: work
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure -C --enable-checking --enable-check-lisp-object-type --with-modules --with-cairo --with-tiff=ifavailable
 'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign'
 PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND
THREADS TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XAW3D XDBE XIM XINPUT2
XPM LUCID ZLIB

Important settings:
  value of $LANG: fr_CH.UTF-8
  locale-coding-system: utf-8-unix

Major mode: InactiveMinibuffer

Minor modes in effect:
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  electric-pair-mode: t
  url-handler-mode: t
  global-reveal-mode: t
  reveal-mode: t
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  type-break-mode: t
  global-compact-docstrings-mode: t
  global-corfu-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  minibuffer-regexp-mode: t
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  auto-compression-mode: t

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/home/monnier/src/emacs/elpa/packages/org/lisp/ox-odt hides /home/monnier/src/emacs/work/lisp/org/ox-odt
/home/monnier/src/emacs/elpa/packages/org/lisp/org-fold hides /home/monnier/src/emacs/work/lisp/org/org-fold
/home/monnier/src/emacs/elpa/packages/org/lisp/org-crypt hides /home/monnier/src/emacs/work/lisp/org/org-crypt
/home/monnier/src/emacs/elpa/packages/org/lisp/ob-org hides /home/monnier/src/emacs/work/lisp/org/ob-org
/home/monnier/src/emacs/elpa/packages/org/lisp/ob-latex hides /home/monnier/src/emacs/work/lisp/org/ob-latex
/home/monnier/src/emacs/elpa/packages/org/lisp/ob-groovy hides /home/monnier/src/emacs/work/lisp/org/ob-groovy
/home/monnier/src/emacs/elpa/packages/org/lisp/ob-sql hides /home/monnier/src/emacs/work/lisp/org/ob-sql
/home/monnier/src/emacs/elpa/packages/org/lisp/org-pcomplete hides /home/monnier/src/emacs/work/lisp/org/org-pcomplete
/home/monnier/src/emacs/elpa/packages/org/lisp/ox-md hides /home/monnier/src/emacs/work/lisp/org/ox-md
/home/monnier/src/emacs/elpa/packages/org/lisp/org-capture hides /home/monnier/src/emacs/work/lisp/org/org-capture
/home/monnier/src/emacs/elpa/packages/org/lisp/org-entities hides /home/monnier/src/emacs/work/lisp/org/org-entities
/home/monnier/src/emacs/elpa/packages/org/lisp/org-goto hides /home/monnier/src/emacs/work/lisp/org/org-goto
/home/monnier/src/emacs/work/lisp/keymap hides /home/monnier/src/emacs/work/lisp/emacs-lisp/keymap
/home/monnier/src/emacs/elpa/packages/landmark/landmark hides /home/monnier/src/emacs/work/lisp/obsolete/landmark
/home/monnier/src/emacs/elpa/packages/crisp/crisp hides /home/monnier/src/emacs/work/lisp/obsolete/crisp

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make-network-process emacs)

Memory information:
((conses 16 720118 577484) (symbols 48 47897 2) (strings 32 230032 32352)
 (string-bytes 1 6576994) (vectors 16 120799)
 (vector-slots 8 3176737 679304) (floats 8 1074 750)
 (intervals 56 38990 2084) (buffers 992 107))

Message #8 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>,
 Andrea Corallo <acorallo <at> gnu.org>
Cc: 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 13 Nov 2023 16:03:45 +0200

> Date: Sun, 12 Nov 2023 17:29:27 -0500
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> Package: Emacs
> Version: 30.0.50
> 
> 
>     emacs -Q
>     (this is an unquoted list)
>     C-j
> 
> Gives me:
> 
>     Debugger entered--Lisp error: (void-function this)
>       (this is an unquoted list)
>       (progn (this is an unquoted list))
>       elisp--eval-last-sexp(t)
>       eval-last-sexp(t)
>       eval-print-last-sexp(nil)
>       funcall-interactively(eval-print-last-sexp nil)
>       command-execute(eval-print-last-sexp)
> 
> But `elisp--eval-last-sexp` doesn't directly run that `progn`.
> Instead it calls `eval` to do so.  Where did `eval` go?
> 
> I see this both in Debian's Emacs-28,2 as well as on `master`.
> In both cases, this is using the native compiler.
> I have a local Emacs with various patches but without using the native
> compiler and the problem doesn't appear there.
> So my crystal ball pointed their pointy finger at the native code compiler.

Adding Andrea.

Message #11 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <acorallo <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 67141 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 13 Nov 2023 11:27:07 -0500

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Sun, 12 Nov 2023 17:29:27 -0500
>> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> 
>> Package: Emacs
>> Version: 30.0.50
>> 
>> 
>>     emacs -Q
>>     (this is an unquoted list)
>>     C-j
>> 
>> Gives me:
>> 
>>     Debugger entered--Lisp error: (void-function this)
>>       (this is an unquoted list)
>>       (progn (this is an unquoted list))
>>       elisp--eval-last-sexp(t)
>>       eval-last-sexp(t)
>>       eval-print-last-sexp(nil)
>>       funcall-interactively(eval-print-last-sexp nil)
>>       command-execute(eval-print-last-sexp)
>> 
>> But `elisp--eval-last-sexp` doesn't directly run that `progn`.
>> Instead it calls `eval` to do so.  Where did `eval` go?
>> 
>> I see this both in Debian's Emacs-28,2 as well as on `master`.
>> In both cases, this is using the native compiler.
>> I have a local Emacs with various patches but without using the native
>> compiler and the problem doesn't appear there.
>> So my crystal ball pointed their pointy finger at the native code compiler.
>
> Adding Andrea.

Thanks,

mmmh, my crystal ball suggests that some (native compiled) code is
calling directly a primitive (eval) without going through funcall, as a
consequence no backtrace is recorded.  AFAIR that's what happen with
byte compiled code with primitves with assigned (byte)op-code as well.

BR

  Andrea

Message #14 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <acorallo <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 67141 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Thu, 16 Nov 2023 04:35:48 -0500

Andrea Corallo <acorallo <at> gnu.org> writes:

> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>>> Date: Sun, 12 Nov 2023 17:29:27 -0500
>>> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>>> 
>>> Package: Emacs
>>> Version: 30.0.50
>>> 
>>> 
>>>     emacs -Q
>>>     (this is an unquoted list)
>>>     C-j
>>> 
>>> Gives me:
>>> 
>>>     Debugger entered--Lisp error: (void-function this)
>>>       (this is an unquoted list)
>>>       (progn (this is an unquoted list))
>>>       elisp--eval-last-sexp(t)
>>>       eval-last-sexp(t)
>>>       eval-print-last-sexp(nil)
>>>       funcall-interactively(eval-print-last-sexp nil)
>>>       command-execute(eval-print-last-sexp)
>>> 
>>> But `elisp--eval-last-sexp` doesn't directly run that `progn`.
>>> Instead it calls `eval` to do so.  Where did `eval` go?
>>> 
>>> I see this both in Debian's Emacs-28,2 as well as on `master`.
>>> In both cases, this is using the native compiler.
>>> I have a local Emacs with various patches but without using the native
>>> compiler and the problem doesn't appear there.
>>> So my crystal ball pointed their pointy finger at the native code compiler.
>>
>> Adding Andrea.
>
> Thanks,
>
> mmmh, my crystal ball suggests that some (native compiled) code is
> calling directly a primitive (eval) without going through funcall, as a
> consequence no backtrace is recorded.  AFAIR that's what happen with
> byte compiled code with primitves with assigned (byte)op-code as well.

PS and indeed similarly what happen calling a primitive from other C
code.

  Andrea

Message #17 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Andrea Corallo <acorallo <at> gnu.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Fri, 17 Nov 2023 14:01:41 -0500

>> mmmh, my crystal ball suggests that some (native compiled) code is
>> calling directly a primitive (eval) without going through funcall, as a
>> consequence no backtrace is recorded.  AFAIR that's what happen with
>> byte compiled code with primitves with assigned (byte)op-code as well.
>
> PS and indeed similarly what happen calling a primitive from other C
> code.

But C code can choose whether it calls `F<foo>` directly or goes through
`Ffuncall`, whereas for ELisp code there is no such control.
It impacts debugging and profiling, in my experience.


        Stefan

Message #20 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <acorallo <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Fri, 17 Nov 2023 15:48:28 -0500

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>>> mmmh, my crystal ball suggests that some (native compiled) code is
>>> calling directly a primitive (eval) without going through funcall, as a
>>> consequence no backtrace is recorded.  AFAIR that's what happen with
>>> byte compiled code with primitves with assigned (byte)op-code as well.
>>
>> PS and indeed similarly what happen calling a primitive from other C
>> code.
>
> But C code can choose whether it calls `F<foo>` directly or goes through
> `Ffuncall`, whereas for ELisp code there is no such control.

Yes, still already with bytecode only in some case in Elisp code it goes
through funcall and in some it doesn't.

> It impacts debugging and profiling, in my experience.

I see, the outcome for me is that we should offer a way for the user to
force the use of funcall.  Unfortunatelly ATM if one writes like
(funcall 'eval ...) it gets optimized.  Maybe even a funcall wrapper
written in Elisp would be sufficient?

  Andrea

Message #23 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Andrea Corallo <acorallo <at> gnu.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Fri, 17 Nov 2023 16:29:27 -0500

>> It impacts debugging and profiling, in my experience.
> I see, the outcome for me is that we should offer a way for the user to
> force the use of funcall.  Unfortunatelly ATM if one writes like
> (funcall 'eval ...) it gets optimized.  Maybe even a funcall wrapper
> written in Elisp would be sufficient?

FWIW, for the specific example in the bug report, I'd argue that we
should never call `Feval` directly because a call to `eval`
is a pretty strong hint that speed is probably not a priority.
Similarly I'd expect that most calls to `mapcar` won't benefit very much
from a direct call because the cost of preparing the call
(constructing a closure to pass to `mapcar`) and running the loop is
probably high enough to dwarf the function call itself.


        Stefan

Message #26 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <acorallo <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 03:55:40 -0500

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>>> It impacts debugging and profiling, in my experience.
>> I see, the outcome for me is that we should offer a way for the user to
>> force the use of funcall.  Unfortunatelly ATM if one writes like
>> (funcall 'eval ...) it gets optimized.  Maybe even a funcall wrapper
>> written in Elisp would be sufficient?
>
> FWIW, for the specific example in the bug report, I'd argue that we
> should never call `Feval` directly because a call to `eval`
> is a pretty strong hint that speed is probably not a priority.
> Similarly I'd expect that most calls to `mapcar` won't benefit very much
> from a direct call because the cost of preparing the call
> (constructing a closure to pass to `mapcar`) and running the loop is
> probably high enough to dwarf the function call itself.

Good points,

With ea7a52dbaed I added eval to 'native-comp-never-optimize-functions'
so this should fix the reported issue, for mapcar I think we should
prove it has really no performance impact before deciding to include it
as well.

Thanks

  Andrea

Message #29 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andrea Corallo <acorallo <at> gnu.org>
Cc: 67141 <at> debbugs.gnu.org, monnier <at> iro.umontreal.ca
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 14:12:44 +0200

> From: Andrea Corallo <acorallo <at> gnu.org>
> Cc: Eli Zaretskii <eliz <at> gnu.org>,  67141 <at> debbugs.gnu.org
> Date: Mon, 20 Nov 2023 03:55:40 -0500
> 
> With ea7a52dbaed I added eval to 'native-comp-never-optimize-functions'
> so this should fix the reported issue, for mapcar I think we should
> prove it has really no performance impact before deciding to include it
> as well.

Should this bug be closed now?

Message #32 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Andrea Corallo <acorallo <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 08:41:51 -0500

>> With ea7a52dbaed I added eval to 'native-comp-never-optimize-functions'
>> so this should fix the reported issue,

Thanks.

>> for mapcar I think we should prove it has really no performance
>> impact before deciding to include it as well.

Agreed.  It occurred to me that there are several places where we use
`mapcar` with a lists that's usually empty, and hence where the funcall
overhead is not necessarily negligible.

> Should this bug be closed now?

AFAIK the sample backtrace is only one among many others and the fact
that the missing element in the backtrace happened to be using `eval` is
circumstantial, so the addition of `eval` to
`native-comp-never-optimize-functions` just circumvents the problem for
`eval` but not for all the other C primitives we call directly.

IOW no, I don't think it fixes the bug :-(


        Stefan

Message #35 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <acorallo <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 10:13:47 -0500

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>>> With ea7a52dbaed I added eval to 'native-comp-never-optimize-functions'
>>> so this should fix the reported issue,
>
> Thanks.
>
>>> for mapcar I think we should prove it has really no performance
>>> impact before deciding to include it as well.
>
> Agreed.  It occurred to me that there are several places where we use
> `mapcar` with a lists that's usually empty, and hence where the funcall
> overhead is not necessarily negligible.
>
>> Should this bug be closed now?
>
> AFAIK the sample backtrace is only one among many others and the fact
> that the missing element in the backtrace happened to be using `eval` is
> circumstantial, so the addition of `eval` to
> `native-comp-never-optimize-functions` just circumvents the problem for
> `eval` but not for all the other C primitives we call directly.
>
> IOW no, I don't think it fixes the bug :-(

If you want then I think we should consider this bug not only native
comp related, as I explained we have this issue since long time in other
circumstances.

  Andrea

Message #38 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Andrea Corallo <acorallo <at> gnu.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 12:52:27 -0500

> If you want then I think we should consider this bug not only native
> comp related, as I explained we have this issue since long time in
> other circumstances.

I think it's qualitatively different, but yes, this is not the only
occurrence of the problem.  AFAICT, we have 3 different cases:

A. Native compiled code making a "direct call" to a C primitive.
B. ELisp primitives with their own bytecode.
C. C code calling `Ffoo` instead of `Ffuncall (Qfoo, ...)`.

(B) and (C) have been with us for ever.  They also suffer from being
unaffected by advice.  (A) on the other hand is new, but obeys advice.

I think (C) is qualitatively very different from (A) because
(C) can be fixed by hand whenever we decide that it's a problem,
i.e. whenever we decide that the fact that the code calls exactly
`foo` (as opposed to some other code with similar behavior) shouldn't
be seen as an internal implementation detail.

Similarly B is qualitatively different from (A) because (B) applies only
to a small set of primitives.

(B) is more annoying than (C), admittedly, since it occurs fairly often
in a backtrace that we'd like to have a better idea of where we are
inside a byte-compiled function.  I'd welcome improvement in this area
(maybe by looking at the (bytecode)PC, then disassembling the bytecode
at that position to find the primitive that we're executing).


        Stefan

Message #41 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <acorallo <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 13:16:39 -0500

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> If you want then I think we should consider this bug not only native
>> comp related, as I explained we have this issue since long time in
>> other circumstances.
>
> I think it's qualitatively different, but yes, this is not the only
> occurrence of the problem.  AFAICT, we have 3 different cases:
>
> A. Native compiled code making a "direct call" to a C primitive.
> B. ELisp primitives with their own bytecode.
> C. C code calling `Ffoo` instead of `Ffuncall (Qfoo, ...)`.
>
> (B) and (C) have been with us for ever.  They also suffer from being
> unaffected by advice.  (A) on the other hand is new, but obeys advice.
>
> I think (C) is qualitatively very different from (A) because
> (C) can be fixed by hand whenever we decide that it's a problem,

Well ATM we can fix A by hand as well with a (declare (speed 0)) in the
calling function.  Admittedly would be nice to have a more narrowed way
to handle this at call site.  I'd e in favor of adding it.  Do you think
this would be sufficient?

  Andrea

Message #44 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Andrea Corallo <acorallo <at> gnu.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: Re: bug#67141: 30.0.50; Missing element in the backtrace
Date: Mon, 20 Nov 2023 13:47:59 -0500

>>> If you want then I think we should consider this bug not only native
>>> comp related, as I explained we have this issue since long time in
>>> other circumstances.
>> I think it's qualitatively different, but yes, this is not the only
>> occurrence of the problem.  AFAICT, we have 3 different cases:
>>
>> A. Native compiled code making a "direct call" to a C primitive.
>> B. ELisp primitives with their own bytecode.
>> C. C code calling `Ffoo` instead of `Ffuncall (Qfoo, ...)`.
>>
>> (B) and (C) have been with us for ever.  They also suffer from being
>> unaffected by advice.  (A) on the other hand is new, but obeys advice.
>>
>> I think (C) is qualitatively very different from (A) because
>> (C) can be fixed by hand whenever we decide that it's a problem,
>
> Well ATM we can fix A by hand as well with a (declare (speed 0)) in the
> calling function.  Admittedly would be nice to have a more narrowed way
> to handle this at call site.  I'd e in favor of adding it.  Do you think
> this would be sufficient?

Don't know if it would be sufficient, nor if it would be useful.
I don't yet have enough experience with it to get a good intuition about
when we need that info and how we use it.  So far, most of the cases
where I noticed the absence of a function in the backtrace:

- I wasn't sure whether it was an occurrence of the current problem,
  or simply some misunderstanding on my part.
- I wouldn't have known which function call to annotate (I needed the
  backtrace info specifically to find that out :-(
- I de-optimized the function by redefining it (i.e. non-compiled) in
  order to solve the immediate lack of info.  It'd be good to reduce our
  reliance on interpreted ELisp code for debugging purposes, but so far,
  that's still our go-to tool, AFAICT.

I suspect that for the non-expert ELisp coder the above are serious problems.


        Stefan

Message #47 received at 67141 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Andrea Corallo <acorallo <at> gnu.org>, 67141 <at> debbugs.gnu.org
Subject: bug#67141: 30.0.50; Missing element in the backtrace 
Date: Mon, 20 Nov 2023 22:01:49 +0100

> B. ELisp primitives with their own bytecode.

Some time ago I made a feeble attempt to remedy this problem but only got as far as dealing with a few byte ops that open-coded their respective Lisp operations (car, aref, and a few more).

The straightforward solution would be to access the PC and SP from a bytecode frame when a backtrace is required but it will be a bit messy and I feared there might be performance consequences, and it's possible that the stack frame format would need changing as well. Still worth a try, though.

(Actually I'd like the option to include a byte code offset to source location map in the compiled bytecode as well. It would be the next logical step. Not sure how best to store it but a byte string is probably what I'd use, possibly loaded dynamically like doc strings.)

Not sure if the native compiler would prefer building on that kind of source location structure but why not.

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