LLVM - How AST can be transformed to IR
llvm, llvm-clang, llvm-gcc, llvm-ir
Solution
Emitting `LLVM IR from Clang ASTs` happens in Clang's `code gen` stage. The code for this stage lives in `lib/CodeGen/` (relative to Clang's source root). There's no need to parse the AST since Clang has the AST in an in-memory data structure. Code generation is essentially a recursive walk of the AST that emits IR into a `Module`. If there's any specific step of it that interests you, the best way to examine it would be to look in the code.
Problem
I know that an `AST` generated by the parser is used to generate IR in the frontend. I am wondering how AST to be parsed and then transformed to IR (prob assembly or bitcode), AST is a tree, what are the steps involved in the transformation from AST to IR.