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Syntax Directed Definition and Translations MCQs | Page 5 of 12
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N = {S , C , S}, terminals T = {a, b , i , t, e}, with S as the start symbol, and the following of rules
S -> iCtSS1 | a
S1 -> eS | Ξ΅
C -> b
The grammar is NOTLL(1) because:
P: Every regular grammar is LL(1)
Q: Every regular set has LR(1) grammar
Which of the following is TRUE?
OP R j , Ri β Performs Rj OP Ri and stores the result in register Ri
OP m, Ri β Performs val OP Ri abd stores the result in Ri. value
denotes the content of memory location m.
MCVm, Ri βMoves the content off memory loction m to register Ri .
MCVm, Ri , m βMoves the content of register Ri to memory location m.
The computer has only two registers, and OP is either ADD or SUB. Consider the following basic block:
t1 = a + b
t2 = c + d
t 3 = e β t2
t 4 = t 1 β t2
Assume that all operands are initially in memory. The final value of the computation should be in memory. What is the minimum number of MOV instructions in the code generated for this basic block?
A->a B->b
A->aS B->bS
A->bAA B->aBB
Which of the following strings is generated by the grammar?
A->a B->b
A->aS B->bS
A->bAA B->aBB
how many derivation trees are there?
(i) A programming language option does not permit global variables of any king and has no nesting of procedures/functions, but permits recursion can be implemented with static storage allocation
(ii) Multi-level access link (or display) arrangement is needed to arrange activation records-only if the programming language being implemented has nesting of procedures/function
(iii) Recursion in programming languages cannot be implemented with dynamic storage allocation
(iv) Nesting of procedures/functions and recursion require a dynamic heap allocation scheme and cannot be implemented with a stack-based allocation scheme for activation records
(v) Languages which permit a function to return a function as its result cannot be implemented with a stack-based storage allocation scheme for activation records
I There exist parsing algorithms for some programming languages hose complex are less than ΞΈ(n 3 )
II A programming language which allows recursion can be implemented with static storage allocation
III No L-attributed definition can be evaluated in the framework of bottom-up parsing
IV Code improving transformations can be performed at both source language and intermediate code level
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