Compiler Design
“Master lexical DFA tokenization, LL(1) grammar conditions, LR parsing tables, syntax-directed translations, and control-flow basic block optimizations.”
A rigorous, mathematically formal study notebook covering all phases of compiler construction: lexical scanning and buffer pair dynamics, regular expressions to minimal DFAs, top-down LL(1) predictive parsing with FIRST and FOLLOW sets, bottom-up LR(0), SLR(1), LALR(1), and CLR(1) canonical item collections, core state merging proofs, S-attributed and L-attributed Syntax-Directed Definitions (SDDs), intermediate Three-Address Code (TAC), Static Single Assignment (SSA), basic block partitioning, Control Flow Graphs (CFG), Directed Acyclic Graphs (DAG), and loop optimizations for undergraduate university excellence and top-rank GATE CS/IT performance.
Structured Notes & Exam Lens
A · B.Tech Structured Study Sequence
5 Sections · Full CurriculumLexical Analysis, Tokenization & Finite Automata
Compiler front-end architecture, role of lexical scanner, tokens, patterns, lexemes, buffer pairs with sentinels, regular expressions, and minimal DFA construction.
Tokenization boundaries, buffer pair pointer arithmetic, and scanner error recovery strategies.
Maximal munch rule, Thompson's construction, subset powerset simulation, and minimal state scanning.
Top-Down Syntax Analysis & LL(1) Parsing
Context-free grammars, leftmost derivations, recursive descent, left recursion elimination, left factoring, FIRST and FOLLOW set algorithms, and LL(1) predictive parsing tables.
Recursive set rules, eliminating immediate and indirect left recursion, and left factoring transformations.
Table construction algorithm M[A, a], LL(1) necessary and sufficient conditions, and multi-entry conflicts.
Bottom-Up Syntax Analysis & LR Parsers
Shift-Reduce parsing, handle pruning, augmented grammars, LR(0) canonical items, SLR(1) FOLLOW resolution, CLR(1) exact lookaheads, LALR(1) state merging proofs, and conflict taxonomy.
Handles, viable prefixes, closure and goto operations, and the canonical LR(0) collection.
FOLLOW-set guided reductions, Shift-Reduce (SR) and Reduce-Reduce (RR) conflict diagnosis.
LR(1) item pairs [A -> alpha . beta, a], canonical state splitting, and the LALR(1) core merging theorem.
Syntax-Directed Translation & Intermediate Code Generation
Syntax-Directed Definitions (SDDs), synthesized vs inherited attributes, S-attributed and L-attributed systems, Three-Address Code, Quadruples, Triples, and Static Single Assignment (SSA).
Inherited vs synthesized attributes, dependency graphs, bottom-up semantic stacks, and DFS traversal rules.
Three-Address Code (TAC), Quadruples vs Triples vs Indirect Triples, and Static Single Assignment (SSA) form.
Code Optimization & Runtime Environments
Basic block partitioning algorithm, Control Flow Graphs (CFG), DAG representation of basic blocks, local optimizations, loop-invariant code motion, induction variables, and activation records.
Leader identification algorithm, CFG construction, DAG value numbering, and loop-invariant hoisting.
B · GATE 2027 Syllabus Scope
Official syllabus scope and related lesson coverage; topics outside the syllabus are marked as enrichment.
- •Lexical analysis: Regular expressions, token recognition, finite automata, input buffering
- •Syntax analysis: Context-free grammars, LL(1) predictive parsing, bottom-up LR(0), SLR(1), LALR(1), CLR(1) parsers, conflicts
- •Syntax-directed translation: S-attributed and L-attributed definitions, evaluation orders, translation schemes
- •Intermediate code generation: Three-address code, quadruples, triples, static single assignment (SSA)
- •Code optimization: Basic blocks, control flow graphs, DAG representation of basic blocks, loop optimizations, data flow analysis
- •Runtime environments: Activation records, storage organization, parameter passing mechanisms
Interactive Labs & Verified PYQs
Revision & Rapid Review Sheets
Authoritative Textbooks & Video Lectures
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