Gate Smashers: Compiler Design

Mastering Compiler Design for GATE: The Ultimate Guide to the "Gate Smashers" Methodology

Phase 4: Syntax Directed Translation (SDT)

• LR(0), SLR(1), CLR(1), LALR(1)
• Item sets, closure, goto
• Parsing table (ACTION & GOTO)

• Widening (int → float) – allowed.
• Narrowing (float → int) – may cause warning/error.

Deterministic Finite Automata (DFA)

Arjun smiled. He began to sketch the for the CLR parser.

5. Code Generation & ABI

Parsing Techniques

: Mastery of different types of parsers is critical, specifically: Top-Down Parsers : Including LL(1) parsing. compiler design gate smashers

Semantic Analysis: Attribute grammars, symbol tables, scope rules, type inference. Example: type-checking rules for simple arithmetic with arrays.

Intermediate Code: Three-address code, quadruples, triples. Example: a = b + c * d → temp = c * d; a = b + temp.

Optimization: Common subexpression elimination, loop-invariant code motion, dead code elimination, register allocation via graph coloring (example small CFG).

Code Generation: DAG-based expression codegen, stack vs register machines example.

Runtime: Activation record layout, static vs dynamic scoping, call-by-value/reference examples.