compiler design

The provided document is a comprehensive set of academic notes on Compiler Design, structured across four primary units. It details the complete process of translating high-level programming languages into machine code, covering both the analysis (front-end) and synthesis (back-end) phases of compilation.

Here is a breakdown of the document's contents by unit:

• Unit 1: Introduction and Lexical Analysis

  • This section introduces language processors and the fundamental structure of a compiler, outlining its various phases.

  • It delves heavily into lexical analysis, explaining tokenization, input buffering, and regular expressions.

  • It also covers the construction and minimization of finite automata, specifically Deterministic Finite Automata (DFA) and Non-Deterministic Finite Automata (NFA).

• Unit 2: Syntax Analysis and Parsing

  • This unit focuses on the role of parsers in verifying grammatical structures using Context Free Grammar (CFG).

  • It explores derivation techniques (Left-Most and Right-Most), parse tree construction, and the identification of ambiguous grammar.

  • It details specific parsing strategies, dividing them into top-down techniques (Recursive Descent, Predictive/LL(1) parsing) and bottom-up techniques (Shift-Reduce, Operator Precedence, LR parsers).

• Unit 3: Syntax Directed Translation (SDT) and Intermediate Code

  • This segment explains how semantic rules are associated with grammar productions using SDT and Syntax Directed Definitions (SDD) to evaluate attributes.

  • It covers the construction of Abstract Syntax Trees (AST) and distinguishes them from concrete parse trees.

  • The unit concludes with the generation of intermediate code, focusing on Three Address Code (TAC) and Postfix/Polish notations.

• Unit 4: Symbol Tables, Optimization, and Code Generation

  • The final unit discusses the organization, purpose, and data structures (such as hash tables, trees, and linked lists) used for maintaining symbol tables throughout the compilation process.

  • It outlines different types of compilation errors (lexical, syntax, and semantic) alongside various error recovery strategies like panic mode and phrase-level recovery.

  • Finally, it details both machine-independent and machine-dependent code optimization techniques (such as dead code elimination, code motion, and strength reduction) and the target code generation process, which includes instruction selection, register allocation, and the use of Directed Acyclic Graphs (DAGs).