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Thank You David and Mats for the reply, The reason I need to know that main is the entry point is as follows : I have a dead code elimination pass that removes the function call for boo. boo was initially called from the main function , but since the return in the main function has no dependency on boo, boo function call is removed. Now I want to remove the function definition of the functions

If you want to know which functions are (or may be) called from where, in the entire program, then you will need to do some sort of "LLVM-IR Linking" (there are tools that will do that for you, such as "llvm-link"). Of course, even then, there's possible cases where it's impossible to know whether a function is ACTUALLY called until at runtime - function pointers,