bug#69952: [PATCH] Support pdumping compiled queries by dumping their source

[Eli Zaretskii]

> Date: Sat, 23 Mar 2024 12:53:37 +0000
> Cc: 69952@debbugs.gnu.org, Daniel Colascione <dancol@dancol.org>,
>  Yuan Fu <casouri@gmail.com>
> From: Sergey Vinokurov <serg.foo@gmail.com>
> 
> On 23/03/2024 07:08, Eli Zaretskii wrote:
> >> Date: Sat, 23 Mar 2024 03:27:18 +0000
> >> From: Sergey Vinokurov <serg.foo@gmail.com>
> >>
> >> This patch aims to allow more things to be dumped. In particular,
> >> compiled treesitter queries can be easily dumped by storing their source
> >> so that they will be recompiled on load.
> >>
> >> I noticed that in my config compiled quires are created somewhere which
> >> prevents me dumping with standard Emacs build. But with this patch I can
> >> dump successfully and not bother finding out who produced the queries.
> >>
> >> It seems like there should be no drawbacks in allowing more things to be
> >> dumped, please correct me if I'm wrong.
> > 
> > Thanks.  I added Daniel and Yuan to the discussion, in case they have
> > comments.
> > 
> > And I have a question: what happens if the pdumper file dumped with
> > tree-sitter available is loaded by an Emacs session in which
> > tree-sitter is not available?  That can happen on Windows, for
> > example, if the tree-sitter library or the grammar library required
> > for recomputing the query is not available.  I think we need some code
> > to prevent Emacs from crashing on startup in that case.
> 
> According to c2ecb08775dc24618de507d2d1ce0f9b0debe17e, treesitter 
> queries are compiled lazily on fist use. When loading dump file in an 
> Emacs with missing grammar library the user should encounter an error on 
> first use of the query.
> 
> Quick testing shows that dump file can be loaded even with grammar 
> definitions removed. Compiled queries are still there in elisp and 
> there's no error during load.

OK, thanks.