The backend phase then takes the IR and executes it. The frontend phase contains Lex and Yacc, which generates the Intermediate Representation in the form of Three Address Code and passes it over to the backend. A short guide on using these tools can be read here. You also need Lex and Yacc installed on your OS. Read what a programming language grammar is on this page and about regular expressions here. Here are a couple of things you should be familiar of:įirst, the general stages of a compiler, namely Lexical Analysis, Syntax Analysis, Semantic Analysis, Code generation, and Optimization. Well, before we get going, let’s make sure we are all on the same page. We will go through implementing function calls, adding native functions printf() and time(), multi-dimensional arrays and floating point numbers.Įxciting? Well, whip up your favourite editor, slap on your playlist and fill your coffee mug. Here is an example program that can be compiled and run: I will try to include all details in the posts, but if something doesn’t work or is mistakenly left out, check the GitHub repository for the full code.īefore building the compiler, let’s establish what the language is. In this series of posts, we will create a small compiler that compiles a subset of C, and then we will build a “virtual machine” that executes the compiled instructions. Have you wondered how a compiler is written? Do you want to learn how to use lex and yacc to write a compiler? Great timing!
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