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Compiler Set2

This document contains a comprehensive examination for a Compiler Design course. It is divided into three sections. Section A contains short answer questions about the differences between syntax trees and parse trees, conflicts in bottom-up parsing, representing an expression as a DAG, and the purpose of a symbol table. Section B contains longer answer questions about LR and operator precedence parsers, generating triples and quadruples from an expression, grammar properties, and FIRST and FOLLOW sets. Section C contains even longer answer questions about code optimization techniques, designing an SDD to create a parse tree, constructing an LR(1) parsing table, and identifying loops using basic blocks and program flow analysis.

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50 views2 pages

Compiler Set2

This document contains a comprehensive examination for a Compiler Design course. It is divided into three sections. Section A contains short answer questions about the differences between syntax trees and parse trees, conflicts in bottom-up parsing, representing an expression as a DAG, and the purpose of a symbol table. Section B contains longer answer questions about LR and operator precedence parsers, generating triples and quadruples from an expression, grammar properties, and FIRST and FOLLOW sets. Section C contains even longer answer questions about code optimization techniques, designing an SDD to create a parse tree, constructing an LR(1) parsing table, and identifying loops using basic blocks and program flow analysis.

Uploaded by

techstudio
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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THE ICFAI UNIVERSITY TRIPURA

EXAMINATION DEPARTMENT
COMPREHENSIVE EXAMINATION, SEM II, AY-2022-23

PROGRAM: 3rd YR B.Tech CSE FULL MARKS: 50


COURSE TITLE: Compiler Design COURSE CODE: CSE326T
*******************************************************************************************************
SECTION- A
Answer the following:

1. Write the difference between syntax tree and parse tree.


2. What are the conflicts may occur in bottom up parsing?
3. Represent the following expression using DAG
z + z * (x – y) + (x – y) * p
4. Write a regular expression for a language containing strings which end with “xyy”
over Ʃ= {x,y}.
5. What is the function of symbol table?

SECTION-B
Answer Any Four of the following:

6. Discuss the advantages and disadvantages of LR parser and operator precedence


parser.
7. Write the quadruples and triples for the expression
X= (a+b)/(a*b)*(g+h)-d
8. Find the Leading and Trailing for the following grammar with details
A A+B/B
BB*C/C
C (A)/id
9. Give the rules for computation of FIRST(X) and FOLLOW(X). Construct FIRST
and FOLLOW sets for the following grammar.
S → aBDh
B → cC
C → bC / ∈
D → EF
E→g/∈
F→f/∈

10. Explain S-attributed and L-attributed SDD

SECTION-C

Answer Any Two of the following:


11. What is code optimization? Explain machine dependent and independent code
optimization with proper example. [2 +8]
12. a. Design a SDD to create a parse tree. [4]
b. Construct the LR(1) parsing table for the following grammar [6]

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E –> E + T | T
T –> (E) | id

13. Write the rules to identify loop using Basic Block and program flow analysis. Find
the basic block for the following three address code [4+6]

1) i=1
2) j=1
3) t1 = 10 * i
4) t2 = t1 + j
5) t3 = 8 * t2
6) t4 = t3 - 88
7) a[t4] = 0.0
8) j = j + 1
9) if j <= goto (3)
10) i = i + 1
11) if i <= 10 goto (2)
12) i = 1
13) t5 = i - 1
14) t6 = 88 * t5
15) a[t6] = 1.0
16) i = i + 1
17) if i <= 10 goto (13)

*****

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