University Of Pune Question Paper
T.E. (Information Technology) (Semester – II) Examination, 2010
SYSTEM SOFTWARE (2003 Course)
Time : 3 Hours Max. Marks : 100
Instructions : 1) Answer any three questions from each Section.
2) Answers to the two Sections should be written in separate
answer books.
3) Neat diagrams must be drawn wherever necessary.
4) Figures to the right indicate full marks.
5) Assume suitable data, if necessary.
SECTION – I
1. a) List the system programs which reside in the system permanently. Briefly
explain each one of these stating the reason why they must reside permanently
in system. 8
b) Explain the following language processor tools : 6
i) LEX ii) YACC
c) Write the significance of debug monitor. 4
OR
2. a) Explain the pass structure of a typical language processor. 8
b) Define the terms : 6
i) Language processor ii) Linker
iii) Macro iv) Interpreter
c) Compare the following : 4
i) Compiler and an Interpreter.
ii) System program and application program.
3. a) What feature of assembler makes it mandatory to design a two pass assembler ?
Explain with the help of an example. 6
b) For the following sample code show the output of PASS-I of two PASS
assembler. Also show the entries of base register table.
SIMPLE START 100
BALR 15, 0
USING *, 15
LOOP L R1, TWO
A R1
, FOUR
ST R1
, FOUR
CLI FOUR +3, 4
BNE LOOP
BR 14
R1 EQU 1
TWO DC F’2’
FOUR DS F
END
Assume : BALR and BR are of two bytes. L,A,ST,CLI,BNE are of four byte
instructions. 10
OR
4. a) For the following input source, show the contents of various Macro definition
table and Macro name table and Argument list array.
START
SR 2, 2
L 1, DATA1
MACRO
ADD_MAIN &ARG1
L 1, &ARG1
A 1, =F’10’
SR 3, 3
ST 1, &ARG1
MEND
AR 2, 2
MACRO
ADD_SECOND &A1,&A2,&A3
ADD_MAIN &A1
ADD_MAIN &A2
ADD_MAIN &A3
MEND
ADD_MAIN DATA1
ADD_SECOND X1, X2, X3
ADD_SECOND X2, X1, X3
DATA1 DC F’20’
X1 DC F’25’
X2 DC F’30’
X1 DC F’35’
END 12
b) Comment on the statement: “Programs with macros require more space at run
time than program with functions”. 4
5. a) With the help of examples, explain top-down parsing scheme. 8
b) Enlist the various databases/data structures used in lexical analyzer. Give the
format of each of these. 8
OR
6. a) Consider the following grammar :
A → aB
B → Ab
B → b.
Show stepwise procedure for recognizing the input string “aabb” using bottom
up parsing technique. 6
b) Enlist the bottlenecks in topdown parsing. Briefly describe them. 8
c) What is lexical analysis ? 2
SECTION – II
7. a) For the statement given below generate intermediate code in the format
i) Quadruple ii) Triple iii) Parse Tree iv) Postfix Notation
A = – P*(– Q + R) 8
b) Explain with the help of suitable examples.
i) Common sub expression elimination
ii) Dead code elimination. 8
c) With respect to the phases of compiler, state TRUE or FALSE :
i) Memory allocation for an identifier is done by lexical analysis phase
ii) Code generation phase can update Identifier table entries. 2
OR
8. a) Explain in brief machine dependent optimization techniques. 4
b) Explain the term activation record and explain its use in storage allocation. 6
c) Write an algorithm for code generation for ‘+’ operator. Clearly mention the
assumptions made. 8
9. a) In the default loading schemes, binding takes place at various points during
the life of a process. Define the term “bind” and give example. 4
b) What point in time do each of the following loading schemes perform binding
i) Absolute loader ii) Dynamic linking loader. 4
c) Explain with the help of flowchart, the design of an absolute loader. 8
OR
10. a) What information must be supplied by an assembler to direct linking loader ?
Explain the significance of this information with respect to the design of direct
linking loader. 8
b) Enlist two advantages and disadvantages of binding at load time over binding
at assembly time. 4
c) Briefly explain : Self relocating programs. 4
11. a) Comment on the statements :
i) “Printer drivers are all dynamic link libraries”
ii) “Few dynamic link libraries are termed as resource only”
iii) “Library files are used by the linker to resolve function calls in the source
code”
iv) “Call back functions are essentially address timer message” 8
b) Explain the term Dynamic Data Exchange. 8
OR
12. a) What are the advantages and disadvantages of dynamic linking with import ? 4
b) Write short note on :
i) Different methods of specifying link ii) Class Libraries 12
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