14. Compiler Design
Learning Objectives
- Explain what a compiler does and why it matters for software development
- Identify and describe each phase of the compilation pipeline
- Distinguish lexical analysis from syntax analysis from semantic analysis
- Trace a token stream through a simple parse tree by hand
- Explain how code generation and optimization improve executable efficiency
- Compare top-down and bottom-up parsing strategies
Quick Answer
A compiler is a program that translates source code written in a high-level language into machine code or another lower-level form. The process happens in stages: first the lexical analyzer breaks source text into tokens, then the parser checks grammatical structure and builds a parse tree, then semantic analysis verifies meaning and types, and finally code generation and optimization produce efficient executable instructions. Each stage feeds the next, making the compiler a production-line processor for programs.
Topics at a Glance
| Topic | What You Will Learn |
|---|---|
| Introduction to Compilers | What compilers are, their components, and why you study them |
| Lexical Analysis | Tokenization, regular expressions, and the scanner phase |
| Syntax Analysis | Parsing, grammars, parse trees, top-down and bottom-up methods |
| Semantic Analysis | Type checking, scope resolution, symbol tables |
| Code Generation and Optimization | IR generation, register allocation, and optimization techniques |
Key Terms
| Term | Definition | Related Concept |
|---|---|---|
| Compiler | A program that translates high-level source code into machine code | Interpreter |
| Token | The smallest meaningful unit of source code identified by the lexer | Lexeme |
| Lexer / Scanner | The compiler phase that converts character sequences into tokens | Regular expressions |
| Parser | The compiler phase that checks grammar and builds parse trees | Grammar rules |
| Parse Tree | A tree representing the grammatical structure of a program | Abstract Syntax Tree |
| Semantic Analysis | Compiler phase that checks meaning, types, and scope | Symbol table |
| Intermediate Representation | A platform-independent internal form between source and machine code | Code generation |
| Code Optimization | Transformations that make generated code faster or smaller | Dead code elimination |
Related Topics
Prerequisites: Programming fundamentals, basic data structures, automata theory
Related Topics: Operating systems, programming language design, formal languages
Next Topics: Advanced compiler optimizations, LLVM architecture, interpreter design