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bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilat
From: |
Eli Zaretskii |
Subject: |
bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation |
Date: |
Tue, 19 Jul 2022 19:49:23 +0300 |
> Date: Tue, 19 Jul 2022 13:45:19 +0000
> From: defun.foo--- via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>
> 1. Ensure that native compilation is enabled by running M-x
> native-comp-available-p
> 2. Run M-x describe-function {{any-function}} and move to the resulting
> *Help* buffer
> 3. Create a bookmark with C-x r m
> 4. Without quitting Emacs, kill the *Help* buffer, then run C-x r b to jump
> back to the bookmark (this works as expected)
> 5. Quit Emacs (C-x C-c), and restart
> 6. Attempt to jump to the same bookmark again (running C-x r b), and observe
> that the bookmark list fails to load and throws an "Invalid read syntax: '#'"
> error
>
> Here is an example of a help bookmark as it was serialized to the bookmarks
> file (note the "help-fn" value):
>
> ("native-comp-bookmark"
> (position . 1)
> (last-modified 25301 49750 590832 312000)
> (help-fn . #<subr F616e6f6e796d6f75732d6c616d626461_anonymous_lambda_9>)
> (help-args switch-to-buffer "*scratch*")
> (position . 1)
> (handler . help-bookmark-jump))
>
> For comparison, I compiled Emacs without the native compilation flag (and
> verified that native-comp-available-p returned nil), and went through the
> same steps above, creating a new bookmark. Jumping back to the bookmark after
> restarting works as expected, and here is an example of that bookmark
> serialized without native comp:
>
> ("vanilla-bookmark"
> (position . 1)
> (last-modified 25301 49238 861856 736000)
> (help-fn .
> #[514 "\301!\205\0\211\302!)\207"
> [describe-function-orig-buffer buffer-live-p
> describe-function]
> 4 "\n\n(fn FUNCTION BUFFER)"])
> (help-args switch-to-buffer "*scratch*")
> (position . 1)
> (handler . help-bookmark-jump))
Thanks.
I started looking into this, but gave up when I got to help-mode.el
(which is where the bookmark support for *Help* lives, and which is
where we signal an error trying to read an unreadable object.)
We basically have no usable documentation for what bookmark support in
help-mode does. Someone who knows what that code does will have to
see how to process a help-fn that is a natively-compiled function.
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, defun . foo, 2022/07/19
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation,
Eli Zaretskii <=
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, defun . foo, 2022/07/19
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Andrea Corallo, 2022/07/20
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Andrea Corallo, 2022/07/20
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Eli Zaretskii, 2022/07/20
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Andrea Corallo, 2022/07/20
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Eli Zaretskii, 2022/07/20
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Michael Heerdegen, 2022/07/20
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Eli Zaretskii, 2022/07/21
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, defun . foo, 2022/07/21
- bug#56643: 29.0.50; Help-mode bookmarks not loading with native compilation, Eli Zaretskii, 2022/07/21