The relation between gtags and gtags-parser

[s g]

Hi,

I didn't find anything in the GNU Global website about the relation between 
gtags and gtags-parser. I know that gtags parses the source files generates the 
database files, and I also that gtags-parser is capable of listing the objects 
in a single source file. It is very logical to think that gtags invokes 
gtags-parser on each of the source files, parses its output and adds it to the 
database. However, from what I saw, gtags-parser can provide much more (or 
different) information than gtags collects in its databases. For example, it 
has some options that gtags does not provide, like "-d" and "-t".

Hence, I'm very interested to know - does gtags use gtags-parser or does it use 
its own independent parser?

Thanks,
Shlomy