[cfe-dev] how VisitBin## methods for binary operators are called

[Rajendra]

Hi, 

Can someone help on how VisitBin## methods are called and how to walk up in
Visit methods? 

I want to understand in case of pre-order DFS traversal by clang, how to
walk up in the tree?
e.g. for expression x + y + z, I am creating an abstract expression whenever
I see an arithmetic operator, how to walk up in tree to get (x+y) as lhs and
z as rhs operand?
I need this for x = x + y + z; to get abstract expression for x+y+z  as rhs
of assignment operator.



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