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* Dynamic modules: MODULE_HANDLE_SIGNALS etc.
@ 2015-11-25 18:39 Eli Zaretskii
  2015-11-25 18:50 ` Philipp Stephani
  2015-11-26 21:29 ` Paul Eggert
  0 siblings, 2 replies; 177+ messages in thread
From: Eli Zaretskii @ 2015-11-25 18:39 UTC (permalink / raw)
  To: dancol, tzz, p.stephani2, aurelien.aptel+emacs; +Cc: emacs-devel

These macros need more extensive documentation wrt when each one is
needed and why.

I tried to "reverse-engineer" that information from its current usage,
and my best hypothesis is that they should be used if a functions
calls some Emacs function that could potentially signal an error or
throw.  For example, module_make_function calls list4, module_funcall
calls Ffuncall, module_copy_string_contents calls ENCODE_UTF_8, etc.

Is that correct?

If it is, then I have a few questions:

  . Why don't some functions use any of these macros, although they do
    call Emacs functions?  Examples include module_make_integer (calls
    make_number), and module_make_user_ptr (calls make_user_ptr).

  . It seems like emacs-module.c assumes something about certain Emacs
    functions, and based on that decides not to use these macros even
    when calling those Emacs functions.  For example, module_vec_get
    calls ASIZE and AREF, but doesn't use the MODULE_HANDLE_* macros.
    Evidently, it assumes that neither ASIZE nor AREF will ever signal
    or throw.  But isn't that a fragile assumption?  The
    implementation of internal Emacs functions is subject to change
    without notice, and it would be a maintenance burden to have to
    analyze upon each such change whether emacs-module.c needs some
    augmentation.

  . How to decide whether to use MODULE_HANDLE_SIGNAL or
    MODULE_HANDLE_THROW (or both)?  Again, it looks like the current
    code simply assumes specific knowledge about certain Emacs
    functions, knowledge which again can become outdated a year or a
    month or a day from now.

So bottom line (again assuming my guesses above are correct), I'd
suggest to use these macros in all the emacs-module.c functions, and
in fact come up with a wrapper around calls to Emacs functions and
macros that will catch signals and throws, and make a point of calling
each such function/macro through that wrapper.

Comments?



^ permalink raw reply	[flat|nested] 177+ messages in thread

end of thread, other threads:[~2017-03-26 20:18 UTC | newest]

Thread overview: 177+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-11-25 18:39 Dynamic modules: MODULE_HANDLE_SIGNALS etc Eli Zaretskii
2015-11-25 18:50 ` Philipp Stephani
2015-11-25 19:24   ` Eli Zaretskii
2015-11-26 21:29 ` Paul Eggert
2015-11-27  7:35   ` Eli Zaretskii
2015-11-27 19:19     ` Philipp Stephani
2015-11-28 10:58       ` Philipp Stephani
2015-11-28 12:10         ` Eli Zaretskii
2015-12-19 21:03         ` Philipp Stephani
2015-12-19 22:57           ` Philipp Stephani
2015-12-20 15:47             ` Eli Zaretskii
2015-12-20 18:34               ` Philipp Stephani
2015-12-20 19:11                 ` Eli Zaretskii
2015-12-20 21:40                   ` Paul Eggert
2015-12-21  3:33                     ` Eli Zaretskii
2015-12-21 11:00                       ` Paul Eggert
2015-12-21 11:21                         ` Yuri Khan
2015-12-21 11:34                           ` Paul Eggert
2015-12-21 15:46                         ` Eli Zaretskii
2015-12-21 18:15                           ` Paul Eggert
2015-12-21 18:28                             ` Daniel Colascione
2015-12-21 19:00                               ` Eli Zaretskii
2015-12-21 20:19                                 ` Philipp Stephani
2015-12-21 19:04                               ` Eli Zaretskii
2015-12-22  4:09                               ` Paul Eggert
2015-12-22  4:38                                 ` Daniel Colascione
2015-12-22  4:48                                   ` Paul Eggert
2015-12-22  4:52                                     ` Daniel Colascione
2015-12-22  6:09                                       ` Paul Eggert
2015-12-22  6:14                                         ` Daniel Colascione
2015-12-22  6:33                                           ` Paul Eggert
2015-12-22  6:35                                             ` Daniel Colascione
2015-12-22  6:44                                               ` Paul Eggert
2015-12-22  6:53                                                 ` Daniel Colascione
2015-12-22 16:13                                                   ` Eli Zaretskii
2015-12-22 16:12                                           ` Eli Zaretskii
2015-12-22 17:26                                             ` Philipp Stephani
2015-12-22 17:51                                               ` Eli Zaretskii
2015-12-22 16:03                                     ` Eli Zaretskii
2015-12-22 16:39                                       ` Paul Eggert
2015-12-22 17:46                                         ` Eli Zaretskii
2015-12-22 23:28                                           ` Paul Eggert
2015-12-23 16:10                                             ` Eli Zaretskii
2015-12-23 16:20                                               ` Philipp Stephani
2015-12-23 16:46                                                 ` Eli Zaretskii
2015-12-23 17:09                                                 ` Paul Eggert
2015-12-23 17:18                                                   ` Daniel Colascione
2015-12-24  2:51                                                     ` Paul Eggert
2015-12-24  3:11                                                       ` Daniel Colascione
2015-12-24 16:10                                                       ` Eli Zaretskii
2015-12-24 17:04                                                         ` Daniel Colascione
2015-12-24 17:17                                                           ` John Wiegley
2016-01-03 14:27                                                             ` Daniel Colascione
2016-01-03 15:46                                                               ` Eli Zaretskii
2016-01-03 15:49                                                                 ` Daniel Colascione
2016-01-03 16:40                                                                   ` Eli Zaretskii
2016-01-03 16:50                                                                     ` Daniel Colascione
2016-01-03 17:20                                                                       ` Eli Zaretskii
2016-01-03 16:31                                                               ` Paul Eggert
2016-01-03 16:48                                                                 ` Daniel Colascione
2016-01-03 18:07                                                                   ` Paul Eggert
2016-01-03 18:22                                                                     ` Daniel Colascione
2016-01-03 21:02                                                                       ` Paul Eggert
2016-01-03 21:12                                                                         ` Daniel Colascione
2016-01-03 23:11                                                                           ` Paul Eggert
2016-01-03 23:22                                                                             ` Daniel Colascione
2016-01-03 23:29                                                                               ` John Wiegley
2016-01-04  1:05                                                                               ` Paul Eggert
2016-01-04  1:07                                                                                 ` Daniel Colascione
2016-01-04 15:38                                                                               ` Eli Zaretskii
2016-01-04 15:40                                                                                 ` Daniel Colascione
2016-01-04 16:07                                                                                   ` Eli Zaretskii
2016-01-04 20:32                                                                                     ` John Wiegley
2016-01-04 20:34                                                                                       ` Daniel Colascione
2016-01-04 20:35                                                                                         ` Daniel Colascione
2016-01-04 22:06                                                                                           ` John Wiegley
2016-01-04 15:24                                                                           ` Eli Zaretskii
2016-01-04 15:28                                                                             ` Daniel Colascione
2016-01-04 16:00                                                                               ` Eli Zaretskii
2016-01-03 17:16                                                                 ` Eli Zaretskii
2016-01-03 17:22                                                                   ` Daniel Colascione
2016-01-03 17:39                                                                     ` Eli Zaretskii
2016-01-03 17:49                                                                       ` Daniel Colascione
2016-01-03 18:08                                                                         ` Eli Zaretskii
2016-01-03 18:24                                                                           ` Daniel Colascione
2016-01-03 18:51                                                                             ` Eli Zaretskii
2016-01-03 19:04                                                                               ` Daniel Colascione
2016-01-03 19:15                                                                                 ` Eli Zaretskii
2016-01-03 19:26                                                                                   ` Daniel Colascione
2016-01-03 19:46                                                                                     ` Eli Zaretskii
2016-01-03 19:47                                                                                       ` Daniel Colascione
2016-01-03 19:49                                                                                   ` John Wiegley
2016-01-03 20:14                                                                                     ` Daniel Colascione
2016-01-04  3:17                                                                           ` Richard Stallman
2016-01-03 18:17                                                                         ` Paul Eggert
2016-01-03 17:43                                                                     ` Eli Zaretskii
2016-01-03 20:25                                                               ` John Wiegley
2016-01-03 20:47                                                                 ` Daniel Colascione
2016-01-03 21:07                                                                   ` John Wiegley
2016-01-03 21:28                                                                     ` Daniel Colascione
2016-01-03 21:31                                                                       ` Daniel Colascione
2016-01-04 15:27                                                                         ` Eli Zaretskii
2016-01-04 15:29                                                                           ` Daniel Colascione
2016-01-04 16:01                                                                             ` Eli Zaretskii
2016-01-03 21:45                                                                       ` John Wiegley
2016-01-03 22:20                                                                         ` Daniel Colascione
2016-01-03 22:43                                                                           ` Crash recovery strategies (was: Dynamic modules: MODULE_HANDLE_SIGNALS etc.) John Wiegley
2016-01-03 22:55                                                                             ` Crash recovery strategies Daniel Colascione
2016-01-03 22:59                                                                               ` John Wiegley
2016-01-03 23:04                                                                                 ` Daniel Colascione
2016-01-03 23:20                                                                                   ` John Wiegley
2016-01-03 23:47                                                                               ` John Wiegley
2016-01-03 23:51                                                                                 ` Daniel Colascione
2016-01-04  0:12                                                                                   ` John Wiegley
2016-01-04 15:40                                                                                   ` Eli Zaretskii
2016-01-04 15:44                                                                                     ` Daniel Colascione
2016-01-04 15:33                                                                               ` Eli Zaretskii
2016-01-04 15:34                                                                                 ` Daniel Colascione
2016-01-04 16:02                                                                                   ` Eli Zaretskii
2016-01-03 23:21                                                                             ` Paul Eggert
2016-01-03 23:24                                                                               ` Daniel Colascione
2016-01-03 23:28                                                                                 ` John Wiegley
2016-01-04  0:51                                                                                 ` Paul Eggert
2016-01-03 23:27                                                                               ` John Wiegley
2016-01-03 23:29                                                                                 ` Daniel Colascione
2016-01-03 23:33                                                                                   ` Sending automatic crash reports to the FSF (was: Crash recovery strategies) John Wiegley
2016-01-03 23:36                                                                                     ` Sending automatic crash reports to the FSF Daniel Colascione
2016-01-03 23:39                                                                                       ` John Wiegley
2016-01-03 23:48                                                                                         ` Daniel Colascione
2016-01-04  1:34                                                                                   ` Crash recovery strategies Drew Adams
2016-01-04 15:32                                                                             ` Crash recovery strategies (was: Dynamic modules: MODULE_HANDLE_SIGNALS etc.) Eli Zaretskii
2016-01-04 15:35                                                                               ` Crash recovery strategies Daniel Colascione
2016-01-04 16:04                                                                                 ` Eli Zaretskii
2016-01-05  4:48                                                                                 ` Richard Stallman
2016-01-05 15:52                                                                                   ` Eli Zaretskii
2016-01-05 16:37                                                                                     ` Clément Pit--Claudel
2016-01-05 17:08                                                                                       ` Eli Zaretskii
2016-01-05 17:38                                                                                         ` Clément Pit--Claudel
2016-01-04 15:31                                                                           ` Dynamic modules: MODULE_HANDLE_SIGNALS etc Eli Zaretskii
2016-01-04 15:41                                                                             ` Daniel Colascione
2016-01-04 16:13                                                                               ` Eli Zaretskii
2016-01-04 15:29                                                                         ` Eli Zaretskii
2016-01-04 15:26                                                                       ` Eli Zaretskii
2015-12-24 17:36                                                           ` Eli Zaretskii
2015-12-24 18:06                                                             ` Daniel Colascione
2015-12-24 19:15                                                               ` Eli Zaretskii
2015-12-22 16:01                                   ` Eli Zaretskii
2015-12-22 16:32                                     ` John Wiegley
2015-12-22 20:31                                     ` Daniel Colascione
2015-12-22 20:46                                       ` Eli Zaretskii
2015-12-22 20:52                                         ` Daniel Colascione
2015-12-22 21:08                                           ` Eli Zaretskii
2015-12-22 21:18                                             ` Daniel Colascione
2015-12-23 16:07                                               ` Eli Zaretskii
2015-12-23 16:25                                                 ` Crash robustness (Was: Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc.) Daniel Colascione
2015-12-23 17:30                                                   ` Eli Zaretskii
2015-12-23 17:41                                                     ` Daniel Colascione
2015-12-23 17:55                                                       ` Eli Zaretskii
2015-12-23 17:56                                                         ` Daniel Colascione
2015-12-23 18:09                                                           ` Eli Zaretskii
2015-12-23 18:19                                                             ` Daniel Colascione
2015-12-23 18:45                                                               ` Eli Zaretskii
2015-12-24  3:26                                                                 ` Daniel Colascione
2015-12-21 18:57                             ` Dynamic modules: MODULE_HANDLE_SIGNALS etc Eli Zaretskii
2015-12-21 20:15                             ` Philipp Stephani
2015-12-20 15:48           ` Eli Zaretskii
2015-12-20 18:27             ` Philipp Stephani
2015-12-20 19:00               ` Eli Zaretskii
2015-12-20 21:00                 ` Philipp Stephani
2017-03-26 20:18                   ` Philipp Stephani
2016-02-29 22:48           ` Philipp Stephani
2016-03-01 16:41             ` Paul Eggert
2016-03-01 21:43               ` Philipp Stephani
2016-03-02 18:54                 ` Paul Eggert
2016-03-31 18:44                   ` Philipp Stephani
2016-04-01  8:29                     ` Paul Eggert
2015-11-28 23:20     ` Paul Eggert

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