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Sh Raj
Sh Raj

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Demystifying Compiler Design: From Source Code to Executable (Course Overview)

#compiler #course #compsci #softwareengineering

Why Care About Compiler Design?

Most developers treat compilers like a black box: write high-level code, hit build, and machine instructions come out. Understanding what happens inside that black box fundamentally changes how you write code, debug runtime failures, optimize performance, and design custom domain-specific languages (DSLs) or developer tools.

This course breaks down the end-to-end architecture of modern compilers into practical, digestible concepts—spanning lexical analysis, parsing, semantic verification, intermediate code generation, runtime environments, and low-level code optimization.

What We Will Build & Learn

The series is structured across five core milestones:

[ Source Code ] 
       │
       ▼
 [ Lexical Analysis (Tokens) ] ─────────► (DFA & Regex)
       │
       ▼
 [ Syntax Analysis (AST/CST) ] ─────────► (LL & LR Parsers)
       │
       ▼
 [ Semantic Analysis & SDTS ]  ─────────► (Type Checking & TAC)
       │
       ▼
 [ Intermediate Code & Runtime ] ───────► (Control Flow & Activation Records)
       │
       ▼
 [ Optimization & Assembly ]   ─────────► (CFG, Dead Code, Constant Folding)
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Course Roadmap

1. Lexical Analysis (Scanning)

  • Anatomy of compilers and compilation phases.

  • Tokenization, lexemes, and input buffering techniques.

  • Direct conversion of Regular Expressions to Deterministic Finite Automata (DFA).

2. Syntax Analysis (Parsing)

  • Context-Free Grammars (CFG) and ambiguity elimination.

  • Top-down parsing strategies: Recursive Descent and predictive $LL(1)$ tables.

  • Bottom-up parsing: Shift-reduce mechanisms, $LR(0)$, $SLR(1)$, $LALR(1)$, and canonical $LR(1)$.

  • Practical error detection and recovery routines.

3. Semantic Analysis & Intermediate Code Generation

  • Syntax-Directed Definitions (SDD) and Syntax-Directed Translation Schemes (SDTS).

  • Synthesized vs. Inherited attribute evaluation.

  • Static type checking and symbol table operations.

  • Generating Three-Address Code (TAC) and translating complex array references.

4. Control Flow & Runtime Environments

  • Evaluating boolean logic (short-circuit vs. complete evaluation).

  • Resolving forward and backward branching in intermediate code.

  • Runtime stack organization, activation records, and function calls/returns.

5. Optimization & Code Generation

  • Constructing Basic Blocks and Control Flow Graphs (CFGs).

  • Machine-independent local and global optimizations.

  • Implementing Constant Folding, Dead Code Elimination, Common Subexpression Elimination, and Loop-Invariant Code Motion.

  • Emitting targeted machine instructions.

Who This Series Is For

  • CS Students: Preparing for core systems courses and technical interviews.

  • Software Engineers: Wanting to build custom linters, transpilers, AST analyzers, or programming languages.

  • Curious Builders: Wanting to demystify low-level systems and execution runtimes.

Follow along for **Part 1: The Anatomy of a Compiler & Building a Fast Lexical Scanner.

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