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Compilers

Compilers. B V Sai Aravind (11CS10008). Outlines. Structure of a Compiler Phases of a Compiler Lexical Analysis Syntax Analysis Semantic Analysis. Structure of a Compiler. Any compiler must perform two major tasks. Analysis of the source program.

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Compilers

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  1. Compilers B V Sai Aravind (11CS10008)

  2. Outlines • Structure of a Compiler • Phases of a Compiler • Lexical Analysis • Syntax Analysis • Semantic Analysis

  3. Structure of a Compiler • Any compiler must perform two major tasks. • Analysis of the source program. • Synthesis of a machine-language program. Compiler Analysis Synthesis

  4. Phases of a Compiler

  5. Phases of a Compiler Symbol Table Manager Intermediate Code Generator Source Program Lexical Analyzer Target Program Code Generator Semantic Analyzer Syntax Analyzer Code Optimizer Error Handler

  6. Lexical Analysis • Characters are grouped into tokens. Example: position = initial + rate * 60 • Position <Identifier, 1> • Operator = <=> • initial <Identifier, 2> • Operator + <+> • Rate <Identifier, 3> • Operator * <*> • 60 <number, 60>

  7. Syntax Analysis • Character groups recorded in symbol table. • The tokens grouped into grammatical phrases. • A parser tree constructed specified by the grammar of the source language.

  8. Semantic Analyzer • Type Checking • Consider the array element A[i] • Checks if i is an integer. • Type Casting • int *float; • Casts the int to float.

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