Re: pure parsers and reentrant scanners

Heikki Linnakangas <hlinnaka@iki.fi>

From: Heikki Linnakangas <hlinnaka@iki.fi>

To: Peter Eisentraut <peter@eisentraut.org>, pgsql-hackers <pgsql-hackers@postgresql.org>

Date: 2024-12-16T08:40:57Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Return yyparse() result not via global variable
- 473a575e0597 18.0 landed
Remove flex version checks
- 0869ea43e9c2 18.0 landed
Drop warning-free support for Flex 2.5.35
- 6fdd5d956343 18.0 landed
plpgsql: pure parser and reentrant scanner
- 7b27f5fd36cb 18.0 landed
flex code modernization: Replace YY_EXTRA_TYPE define with flex option
- b1ef48980ddd 18.0 landed
guc: reentrant scanner
- d663f150b5ed 18.0 landed
jsonpath scanner: reentrant scanner
- 2a7425d7eef9 18.0 landed
syncrep parser: pure parser and reentrant scanner
- db6856c9913f 18.0 landed
replication parser: pure parser and reentrant scanner
- e4a8fb8fefb9 18.0 landed
bootstrap: pure parser and reentrant scanner
- 3e4bacb17100 18.0 landed
Small whitespace improvement
- 399d0f1e11b5 18.0 landed
Prevent redeclaration of typedef yyscan_t
- 382092a0cd2c 18.0 landed
seg: pure parser and reentrant scanner
- 1f0de66ea2a5 18.0 landed
cube: pure parser and reentrant scanner
- 802fe923e3cd 18.0 landed

On 16/12/2024 09:39, Peter Eisentraut wrote:
> On 02.12.24 10:46, Peter Eisentraut wrote:
>> This patch series changes several parsers in the backend and contrib 
>> modules to use bison pure parsers and flex reentrant scanners. This is 
>> ultimately toward thread-safety, but I think it's also just nicer in 
>> general, and it might also fix a few possible small memory leaks.
> 
> I did a bit more work on this, so here is an updated patch set.

Looks good to me. There's more work to be done, but this is all good 
steps in the right direction.

-- 
Heikki Linnakangas
Neon (https://neon.tech)