cscope-like tool to find lvalue/rvalue instances

Question

I am looking for something that will parse a body of C code and, like cscope, let me search for symbols. In particular, I want to be able to get a list that says something like "in these places, foobar is used as an lvalue, and in these places, it's used as an rvalue". This seems like a pretty useful tool, and doesn't seem like too much work beyond what tools like cscope and semantic-symref already do, so I would imagine it already exists. Does it?