Compiler-Design
February 12, 2024Question 9791 – Finite-Automata
February 12, 2024Compiler-Design
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Question 32
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Consider the productions A⟶PQ and A⟶XY. Each of the five non-terminals A, P, Q, X, and Y has two attributes: s is a synthesized attribute, and i is an inherited attribute. Consider the following rules.
Rule 1: P.i = A.i + 2, Q.i = P.i + A.i, and A.s = P.s + Q.s
Rule 2: X.i = A.i + Y.s and Y.i = X.s + A.i
Which one of the following is TRUE?
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Only Rule 2 is L-attributed.
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Neither Rule 1 nor Rule 2 is L-attributed.
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Both Rule 1 and Rule 2 are L-attributed.
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Only Rule 1 is L-attributed.
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Question 32 Explanation:
In rule 2 for production A -> XY the attribute “i” is calculated from the right sibling Y in X.i = A.i + Y.s which is violating the L attribute definition, as in L attribute calculating attribute vale from RHS sibling is not allowed.
Correct Answer: D
Question 32 Explanation:
In rule 2 for production A -> XY the attribute “i” is calculated from the right sibling Y in X.i = A.i + Y.s which is violating the L attribute definition, as in L attribute calculating attribute vale from RHS sibling is not allowed.
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