I have a question for gcc front-end

["하태준"]

I am making a back-end compiler to use a gcc front-end

I want to translate gcc intermediate representation to our IR

gcc's IR is tree 

so i want to view gcc IR

but i can't find view gcc IR option

-fdump-translation-unit-all make a .tu file , Is this gcc's IR?

but .tu file doesn't have date token and so on

what is the option about gcc IR ?