[cfe-dev] how can i get du-chain(define-use) in checker

[종모님 via cfe-dev]

I have successfully registered and run a test checker.
Now I want to get the definition of the variable and the use chain.

So while referring to other checkers' sources, I couldn't find a DU-chain.

Q. how can i get du-chain(define-use) in checker implementation?
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