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Subject: Re: faster printing of QStrings
From: Ramana Radhakrishnan <ramana.radhakrishnan@celunite.com>
Reply-To: ramana.radhakrishnan@celunite.com
To: Markus.Grunwald@pruftechnik.com
Cc: gdb@sourceware.org
In-Reply-To: <OFF8FB08FC.7E6D07C5-ONC12572A6.004381A6-C12572A6.00448247@pruftechnik.com>
References: 	 <OFF8FB08FC.7E6D07C5-ONC12572A6.004381A6-C12572A6.00448247@pruftechnik.com>
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On Thu, 2007-03-22 at 13:28 +0100, Markus.Grunwald@pruftechnik.com
wrote:
> Hello,
> 
> we are developing Qt applications. kdevelops debugger offers a watch where 
> it can display QStrings. I am more the commandline user and have found a 
> nice function that prints QStrings with gdb:

> 
> define pqs
>     set $i=0
>     set $unicode=$arg0.d->unicode
> 
>     printf "Getting QString...\n"
>     while $i < $arg0.d->len
>         set $c=$unicode[$i++].ucs
>         if $c < 32 
>           printf "\\0%o", $c
>         else
>           if $c <= 127
>             printf "%c", $c
>           else 
>             printf "\\0%o", $c
>           end 
>         end
>     end
>     echo \n
> end
> 
> (gdb) pqs oszPrinterLine
> Getting QString...
> kopierer akzeptiert Anfragen seit Mo 19 Feb 2007 13:27:28 CET
> 
> Works fine - except that it takes ages (25s) ! Kdevelop displays the 
> QStrings in an instant. Now I wonder if there is a faster way of getting 
> this information in gdb - and maybe even to "display oszPrinterLine" which 
> makes sense only if printing is fast... ?

Might it go a bit faster if you used a convenience variable for len
too :) ? 

set $len = $arg0.d->len

while $i < $len 

Getting the actual length is loop invariant. I am no expert in the gdb
scripting areas ... 

cheers
Ramana 

> 
> Mit freundlichen Grüßen
> 
> Markus Grunwald
> Softwareentwicklung
> 
> PRÜFTECHNIK Condition Monitoring GmbH
> Oskar-Messter-Straße 19-21
> 85737 Ismaning
> www.pruftechnik.com
> Tel: +49 (0)89 99616177
> Fax: +49 (0)89 99616200
> 
> PRÜFTECHNIK Condition Monitoring GmbH
> Sitz Ismaning / HRB 145655 München 
> Geschäftsführer: Johann Lösl, Roland Schühle
> 
> Ein Unternehmen der PRÜFTECHNIK-Gruppe

-- 
cheers
Ramana

Ramana Radhakrishnan
IDE & Tools Group
Celunite Inc (www.celunite.com)