In this chapter, you learned how to create simple LLVM IR using rich libraries provided by LLVM. Remember that LLVM IR is an intermediate representation. The high-level programming languages are converted to LLVM IR using the custom parser, which breaks down the code into atomic pieces such as variables, functions, function return type, function arguments, if-else conditions, loops, pointers, array, and so on. These atomic elements can be stored into custom data structures and then those data structures can be used to emit LLVM IR, as demonstrated in this chapter.
In the parser phase, syntactic analysis can be done, while lexical analysis and type checking can be done in an intermediate stage after parsing and before emitting IR.
In practical usage, one would hardly find the IR being emitted in a hard-coded way as demonstrated in this chapter. Instead, a language is parsed and represented in an Abstract Syntax Tree. The tree is then used to emit LLVM IR with the help of the LLVM library...