FACULTY OF ENGINEERING B.E. 3/4 (IT) II – Semester (New) (Main) Examination, April / May 2013 Subject: Compiler Construction Time: 3 Hours
Max.Marks: 75
Note: Answer all questions from Part – A and any five questions from Part – B. PART – A (25 Marks) 1. 2. 3. 4. 5. 6. 7.
List the major data structures used in a compiler. What is the role of a lexical analyzer in a compiler? Write the regular definition for the language of C identifiers. Write the types of errors that occur in programming. Remove the left recursion from E E+n/n Define synthesized and inherited attributes. Draw DAG for the following expression
(2) (2) (3) (2) (2) (3)
8. 9. 10.
a + a∗(b-c) + (b-c)∗d What is short circuit code? Write the design goals of a garbage collector. List the techniques used for semantic preserving transformation.
(3) (2) (3) (3)
PART – B (5x10 = 50 Marks) 11.(a) Explain the translation process with a neat diagram. (b) Give a brief description about lex.
(5) (5)
12.(a) Compute FIRST and FOLLOW sets for the following grammar S iEtSS’/a S’ eS/E E b. (b) Write the algorithm for the construction of predictive parsing table.
(5)
13.
(5)
Explain the process of shift-reduce parsing on the i/p string id1∗id2 for the following grammar. (10) E E + T / T T T∗F / F F (E) / id
14.(a) Translate the assignment statement a[i]= b∗c - b∗d into quadruples and triples. (b) Using goto-avoiding translation scheme translate the expression if(a = = b & & c = = d"" e = = f) x = 1.
(5) (5)
15.(a) Discuss the issues in the design of a code generator. (5) (b) Generate code for the following sequence assuming x,y,z are in memory locations. (5) if x < y go to 1 z=0 go to L2 L1 : z = 1 16.(a) Explain the data-flow analysis framework. (b) Explain the design of absolute loader. 17.
Write short notes on: a) Parser generator YACC b) Conflicts in shift-reduce parsing. c) Rules for type checking.
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b) Conflicts in shift-reduce parsing. (3). c) Rules for type checking. (3) ****. Page 1 of 1. Vasavai CE B.E IT 3rd Year Apr 2013 Compiler Construction.pdf. Vasavai ...
Write LR(0) items for the following grammar (3). E E + n / n. 5. Define shift â reduce conflict and Reduce â reduce conflict. (3). 6. Writ the Attribute grammar from ...
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8. Write about Document processing operations. (3). 9. What are the steps of searching algorithm on an Inverted Index? (2). 10. Write about structural queries. (2).
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5. Does perception requires supervised learning ? Justify the answer. (2). 6. What is linear separability? (2). 7. What is meant by continuous Hopfield Net? (2). 8.
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... and bottom-up parse of the sentence "The Odd man cried". 13.What is transition Network? Explain ATN with example. 14.(a) Explain shift reduce parser.
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