llvm dev - May 2018 - How to analyze a linux kenel system call function's read and write data type?

Hi all,
I want to use llvm to analyze the dependency between the system call
fuction( defined like sys_**() ) by analyze its read and write data type.
I'm a new in using llvm to statically analyze the C souce code. I have
learned how to write Pass and searched some materials for a month, but
didn't know exactly how to do it. I have some troubles, it's very kind
of
you to give me some help, materials or code demo.
1) Is it right firstly to recognize the sys_*() fuction? How to recognize
it?
2) Is it right secondly to use llvm::type class to analyze the data type?
How to do what I want?


Best Regards
Yang Ou
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