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LANGUAGE PROCESSORS

Presented By: Prof. S.J. Soni, SPCE – Visnagar.

Introduction




Language Processing activities arise due to the differences between the manner in which a software designer describes the ideas concerning the behavior of a software and the manner in which these ideas are implemented in a computer system.
The designer expresses the ideas in terms related to the application domain of the software. To implement these ideas, their description has to be interpreted in terms related to the execution domain.

Semantic Gap
Semantic Gap
Application
Domain



Execution
Domain

Semantic Gap has many consequences
 Large

development time
 Large development effort
 Poor quality of software

Specification and Execution Gaps
Specification Gap

Application
Domain



Execution Gap

PL
Domain

Execution
Domain

The software engineering steps aimed at the use of a
PL can be grouped into
Specification, design and coding steps
 PL implementation steps


Specification and Execution Gaps


Specification Gap
 It

is the semantic gap between two specifications of the same task.



Execution Gap
 It

is the gap between the semantics of programs (that perform the same task) written in different programming languages.

Language Processors






“A language processor is a software which bridges a specification or execution gap”.
The program form input to a language processor as the source program and to its output as the target program. The languages in which these programs are written are called source language and target language, respectively. Types of Language Processors








A language translator bridges an execution gap to the machine language (or assembly language) of a computer system. E.g. Assembler, Compiler.
A detranslator bridges the same execution gap as the language translator, but in the reverse direction.
A preprocessor is a

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