GATE CS 2024 Set 2 — Question 29
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Compiler Design → Semantic Analysis → Attribute Grammars
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Question
Which of the following statements is/are FALSE?
Correct answer
(B) The attributes in a L-attributed definition cannot always be evaluated in a depth-first order; (D) All L-attributed definitions based on LR(1) grammar can be evaluated using a bottom-up parsing strategy
Solution
Statement (A) is true; it is the standard definition of an attribute grammar. Statement (B) is FALSE because L-attributed definitions are specifically defined such that their attributes can be evaluated in a single depth-first (left-to-right) traversal. Statement (C) is true because synthesized attributes depend only on children nodes, which are available during a bottom-up (post-order) traversal. Statement (D) is FALSE because not all L-attributed definitions can be evaluated during a single bottom-up pass; while techniques like marker non-terminals exist to handle inherited attributes, they can transform an grammar into one that is no longer .
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