Tribhuvan University

Institute of Science and Technology

2076

Bachelor Level / sixth-semester / Science

Computer Science and Information Technology( CSC365 )

Compiler Design and Construction

Full Marks: 60 + 20 + 20

Pass Marks: 24 + 8 + 8

Time: 3 Hours

Candidates are required to give their answers in their own words as far as practicable.

The figures in the margin indicate full marks.

Section A

Attempt all question.

1

Explain briefly about different phases involved in compiler, with a block diagram.

2

Given a regular expression (ε + 0)*10. Construct the DFA recognizing the pattern described by this regular expression using syntax
tree based reduction.

3

What is shift reduce parsing techniques? Show shift reduce parsing action for the string (x+x)*a, given the grammar

4

Construct SLR parsing table for the following grammar.
S -> aAa | bAb | ba

5

Define Syntax directed definition. Construct annotated parse tree for the input expression (5*3+2)*5 according to the following
syntax directed definition.

- Hamro CSIT

6

Write Syntax Directed Definition to carry out type checking for the following expression.
E -> id | E1 op E2 | E1 relop E2 | E1[E2] | E1 ↑

7

Explain with example about different methods of intermediate code representation.

8

What is the purpose of code optimization? Explain different types of loop optimization techniques with example.

9

Discuss about different factors affecting the process of target code generation.

10

Discuss the importance of error handler in compiler. How is it manipulated in the different phases of compilation?