Where does GDB handle user command?

Fei Ding <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <CAGmPkf+LQg+qbiT_63viirX_jT0gG0yu5-ShJ3+uZ4g2uyjAdQ@mail.gmail.com> 
Hi

I'm looking for the source code of handling user command, for example,
I want to know which function(or functions) will work after a user
input command "set architecture i386", I've traced a long time but may
miss something, any suggestion?

And I just want to know the process BEFORE GDB create an event
according to user input, not after creating an event.

Thanks a lot
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