Parsing and Modifying LLVM IR code

Question

I want to read (parse) LLVM IR code (which is saved in a text file) and add some of my own code to it. I need some example of doing this, that is, how this is done by using

Answer 1

This is usually done by implementing an LLVM pass/transform. This way you don't have to parse the IR at all because LLVM will do it for you and you will operate on a object-oriented in-memory representation of the IR.

This is the entry point for writing an LLVM pass. Then you can look at any of the already implemented standard passes that come bundled with LLVM (look into lib/Transforms).