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Date: Mon, 1 Nov 2010 23:41:34 +0100
To: Derick Rethans <derick@php.net>
Cc: PHP Developers Mailing List <internals@lists.php.net>
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Subject: Re: [PHP-DEV] PHP 5.4: Rewriting of the parser into Lemon
From: colder@php.net (Etienne Kneuss)

On Nov 01 15:33:59, Derick Rethans wrote:
> Hi!
> 
> Work has been done on rewriting the PHP parser to Lemon in a specific 
> branch: http://svn.php.net/viewvc/php/php-src/branches/LEMON/
> 
> Right now, the Lemon parser is not actually faster than the current 
> bison parser, so I would suggest not to put this in PHP 5.4 until it 
> performs at least as well as the current parser.
> 
> Are there any possibilities for optimisation so far?

I'd make the guess that it is slower due to the rule decomposition that
we had to do to match bison's "mid-rules" syntax.

We could surely optimize the decomposition but it would require a lot of
rewrite in zend_compile.c, which is quite tricky to do.

> 
> cheers,
> Derick
> 
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-- 
Etienne Kneuss
http://www.colder.ch