Lowering C source code to LLVM assembly (with clang)

To emit LLVM IR from a c file, run :

$ clang -emit-llvm -S myFile.c -o myIR.ll

How does it works ?

The lexer breaks C code into a token stream (token example : identifier, literal, operator, ...)
Feed the token stream to the parser, which builds the Absract Syntax Tree (AST) with the help of Context Free Grammar (CFG) for the language
Semantic analysis
IR generation