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Course Code-18CS61
CIE Marks-40
Number of Contact Hours/Week-3:2:0
SEE Marks-60
Total Number of Contact Hours-50
Exam Hours-03

Course Learning Objectives: This course (18CS61) will enable students to:

 Define System Software.
 Familiarize with source file, object file, and executable file structures and libraries
 Describe the front-end and back-end phases of compiler and their importance to students

Module 1

Introduction to System Software, Machine Architecture of SIC and SIC/XE. Assemblers: Basic assembler functions, machine dependent assembler features, machine independent assembler features, assembler design options. Basic Loader Functions
Text book 1: Chapter 1: 1.1,1.2,1.3.1,1.3.2, Chapter2 : 2.1 to 2.4, Chapter 3 ,3.1
RBT: L1, L2, L3

Module 2

Introduction: Language Processors, The structure of a compiler, The evaluation of programming languages, The science of building compiler, Applications of compiler technology.
Lexical Analysis: The role of lexical analyzer, Input buffering, Specifications of token, recognition of tokens.
Text book 2:Chapter 1 1.1-1.5 Chapter 3: 3.1 – 3.4
RBT: L1, L2, L3

Module 3

Syntax Analysis: Introduction, Context Free Grammars, Writing a grammar, Top Down Parsers, Bottom-Up Parsers
Text book 2: Chapter 4 4.1, 4.2 4.3 4.4 4.5
RBT: L1, L2, L3

Module 4

Lex and Yacc –The Simplest Lex Program, Grammars, Parser-Lexer Communication, A YACC Parser, The Rules Section, Running LEX and YACC, LEX and Hand- Written Lexers, Using LEX - Regular Expression, Examples of Regular Expressions, A Word Counting Program,
Using YACC – Grammars, Recursive Rules, Shift/Reduce Parsing, What YACC Cannot Parse, A YACC Parser - The Definition Section, The Rules Section, The LEXER, Compiling and Running a Simple Parser, Arithmetic Expressions and Ambiguity.
Text book 3: Chapter 1,2 and 3.
RBT: L1, L2, L3

Module 5

Syntax Directed Translation, Intermediate code generation, Code generation
Text book 2: Chapter 5.1, 5.2, 5.3, 6.1, 6.2, 8.1, 8.2
RBT: L1, L2, L3

Course Outcomes: The student will be able to :

 Explain system software
 Design and develop lexical analyzers, parsers and code generators
 Utilize lex and yacc tools for implementing different concepts of system software

Question Paper Pattern:

 The question paper will have ten questions.
 Each full Question consisting of 20 marks
 There will be 2 full questions (with a maximum of four sub questions) from each module.
 Each full question will have sub questions covering all the topics under a module.
 The students will have to answer 5 full questions, selecting one full question from each module.


1. System Software by Leland. L. Beck, D Manjula, 3rd edition, 2012
2. Alfred V Aho, Monica S. Lam, Ravi Sethi, Jeffrey D. Ullman , Compilers-Principles, Techniques and Tools, Pearson, 2nd edition, 2007 3. Doug Brown, John Levine, Tony Mason, lex & yacc, O'Reilly Media, October 2012.

Reference Books:

1. Systems programming – Srimanta Pal , Oxford university press, 2016
2. System programming and Compiler Design, K C Louden, Cengage Learning
3. System software and operating system by D. M. Dhamdhere TMG
4. Compiler Design, K Muneeswaran, Oxford University Press 2013.