Compilers B V Sai Aravind (11CS10008).

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Presentation transcript:

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. Synthesis of a machine-language program. Compiler Analysis Synthesis

Phases of a Compiler

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

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>

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.

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