Re: PHP 5.4: Rewriting of the parser into Lemon

We should probably stick with the bison parser for now, at least until the lemon matches the speed of the existing solution. On Mon, Nov 1, 2010 at 3:41 PM, Etienne Kneuss <colder@php.net> wrote: > 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 >> >> -- >> http://derickrethans.nl | >> http://xdebug.org >> Like Xdebug? Consider a donation: >> http://xdebug.org/donate.php >> twitter: @derickr and @xdebug >> >> -- >> PHP Internals - PHP Runtime Development Mailing List >> To unsubscribe, visit: http://www.php.net/unsub.php >> > > -- > Etienne Kneuss > http://www.colder.ch > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > >