how can i get du-chain(define-use) in checker

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how can i get du-chain(define-use) in checker

Hans Wennborg 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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