9cc C compiler

9cc is a small and educational C compiler designed to demonstrate the internal workings of a compiler while still being capable of compiling meaningful programs. It serves as a continuation of Rui Ueyama’s series of compiler projects, focusing on clarity and incremental development rather than production-level optimization. The compiler implements essential stages such as lexical analysis, parsing, semantic analysis, and code generation, providing a complete pipeline from source code to executable output. It supports a subset of the C language sufficient to understand real-world compilation concepts, making it a valuable learning resource for developers interested in low-level programming. The project emphasizes readability and simplicity, with code structured to be easily understood rather than highly optimized. It also demonstrates key compiler design principles such as abstract syntax trees and symbol tables.