Compiler — Design Gate Smashers

Manages memory allocation and scope during program execution. Key Parsing Techniques

for FIRST and FOLLOW sets with a sample grammar.

Parsing is the most heavily weighted topic in the GATE compiler design syllabus. Parsers are broadly categorized into and Bottom-Up Parsers .

A compiler is a specialized software system that translates high-level source code into low-level machine language. This translation happens in two primary parts: the , which understands the source code, and the Synthesis Phase (Back-End) , which constructs the target program.

[ Source Code ] │ ▼ 1. Lexical Analyzer ──► (Token Stream) │ ▼ 2. Syntax Analyzer ──► (Parse Tree) │ ▼ 3. Semantic Analyzer ──► (Annotated Tree) │ ▼ 4. Intermediate Code ──► (Three-Address Code) │ ▼ 5. Code Optimizer ──► (Optimized IR) │ ▼ 6. Code Generator ──► [ Target Machine Code ] compiler design gate smashers

Then there was the , which Arjun used to call the ‘Brain of the Operation.’ It kept track of everything—scope, type, memory location. If a variable wasn't in the table, it didn't exist. It was the gatekeeper. He moved to the next question: Code Optimization .

A compiler operates through analysis (front-end) and synthesis (back-end) phases.

Don't confuse optimization phases. Peephole optimization looks at few adjacent lines; Global optimization looks at whole basic blocks.

Neso Academy: Excellent for deeper theoretical foundational knowledge. Manages memory allocation and scope during program execution

Tokenization, Regular Expressions, Finite Automata.

Do not start Compiler Design without a solid grasp of Regular Expressions and Context-Free Grammars from the Theory of Computation syllabus.

This is the first phase of a compiler. Gate Smashers explains that the Lexical Analyzer reads the stream of characters making up the source program and groups them into meaningful sequences called . It identifies keywords, identifiers, operators, and constants, stripping away comments and whitespace in the process. Understanding tokenization is the first step in mastering how a compiler "reads" your code.

A standard compiler creates a branch (a gate): Parsers are broadly categorized into and Bottom-Up Parsers

Briefly explain the six phases of a compiler and their primary functions. Left Recursion:

The lexical analyzer reads the high-line source code as a stream of characters and groups them into meaningful sequences called . For each lexeme, the scanner outputs a Token to send to the syntax analyzer. Token Format:

Heavy emphasis on parsing table construction (LL, LR, SLR, CLR, LALR) and optimization algorithms.

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