Re: Re : gcc analyze tools

[Jeff Kenton <jkenton at tilera dot com>]

On 07/25/2011 11:10 AM, Andi Hellmund wrote:
> Hey Asma,
>
> > However, have you any idea why gcc uses now hand
> > written lexer and parsers ?
> > what's wrong with lexer/ parser generated from
> > flex/ bison ?
> This is just a wild guess from my side because I was not involved in this change:
>
> I think there is generally nothing wrong with flex/bison but you would possibly switch to hand-written code to get better performance and to have better control on the code of the lexer/parser (though not depending on externals tools whose generated code might change). By using hand-written code you could then specifically tune some parts of your code.
>
> But maybe, you'll also get an answer from someone being involved in that change ;-)
>
> Best regards,
> Andi

Another guess:  it's really tough to parse C++ with tools like flex and 
bison, and you don't always get exactly what you need.  There's just too 
much magic in the language.

--jeff