bug#71012: 30.0.50; tree-sitter crash

[Yuan Fu <casouri@gmail.com>]

> On Aug 3, 2024, at 8:01 PM, Yuan Fu <casouri@gmail.com> wrote:
> 
> 
> 
>> On Jul 25, 2024, at 3:40 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> 
>>> From: Yuan Fu <casouri@gmail.com>
>>> Date: Thu, 25 Jul 2024 00:26:30 -0700
>>> Cc: "Basil L. Contovounesios" <basil@contovou.net>,
>>> 71012@debbugs.gnu.org,
>>> Helmut Eller <eller.helmut@gmail.com>
>>> 
>>>> On Jul 24, 2024, at 10:27 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>>>> 
>>>>> From: "Basil L. Contovounesios" <basil@contovou.net>
>>>>> Cc: casouri@gmail.com,  71012@debbugs.gnu.org,  eller.helmut@gmail.com
>>>>> Date: Thu, 25 Jul 2024 01:32:01 +0200
>>>>> 
>>>>> Eli Zaretskii [2024-07-24 19:31 +0300] wrote:
>>>>> 
>>>>>>> Cc: 71012@debbugs.gnu.org, eller.helmut@gmail.com
>>>>>>> From: "Basil L. Contovounesios" <basil@contovou.net>
>>>>>>> Date: Wed, 24 Jul 2024 16:57:53 +0200
>>>>>>> 
>>>>>>> Ping: thoughts on whether this is an issue?
>>>>>> 
>>>>>> Thoughts about what? what is deemed to be a problem in this case?
>>>>> 
>>>>> That each call to treesit-parse-string now allocates a new internal
>>>>> buffer which is not automatically GCed.
>>>>> 
>>>>> If this cannot be avoided, I think the docs should at least warn that
>>>>> it's the caller's responsibility to kill the return node's buffer when
>>>>> finished with it.
>>>> 
>>>> If the buffers aren't killed by the code, it's indeed an issue that
>>>> needs to be solved.  At the time I suggested that the node's buffer is
>>>> killed when the node is GC'ed or deleted -- have this not been done?
>>> 
>>> No. I think it’s best to implement treesit-parse-string in C with ts_parse_string now. That way we don’t need to worry about the temp buffer.
>> 
>> That'd be fine as well, yes.
> 
> Just to update that this is taking longer than I expected. I need to change many things so the parsed tree ends up properly gc’ed. Now I remember why I used with-temp-buffer at the first place :-)
> 
> Yuan
> 

Ok, after much struggle I settled with the easier option, which is to still use a temp buffer, but make sure Emacs garbage collects the temp buffer. I detailed the reasoning in the comment above Ftreesit_parse_string. I verified that the buffer gets collected when the nodes are collected, and pushed it to master.

Yuan