Which one of the following statements is TRUE?a)LR(1) parsing is suffi...
LR(1) parsing is sufficient for deterministic context-free languages: True, LR(k) grammars (also known as deterministic context-free grammars) allow parsing (string recognition) with deterministic pushdown automata (PDA), they can only define deterministic context-free languages.
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Which one of the following statements is TRUE?a)LR(1) parsing is suffi...
Understanding LR(1) Parsing
LR(1) parsing is a type of bottom-up parsing technique widely used in compiler design. It can parse a larger class of deterministic context-free languages than many other parsing techniques.
Why is Option A True?
- Sufficient for Deterministic Context-Free Languages:
- LR(1) parsers can handle all deterministic context-free languages, meaning they can uniquely parse strings based on grammar with a single lookahead token.
- The "1" in LR(1) indicates that the parser uses one lookahead token to make parsing decisions, making it versatile and powerful.
Analyzing Other Options
- Option B - Data Flow Analysis:
- While useful for optimizing compilers, it is not necessary for run-time memory management. Memory management often involves allocation and deallocation rather than data flow analysis.
- Option C - Symbol Table Access:
- Symbol tables are utilized during various stages of compilation, including syntax analysis and semantic analysis, not just lexical analysis.
- Option D - LALR(1) Parser:
- LALR(1) parsers can have reduce-reduce conflicts even if the LR(1) parser does not. This is because LALR(1) combines states that can lead to ambiguities not present in the LR(1) version.
Conclusion
The correct answer is Option A, as LR(1) parsing is indeed sufficient for all deterministic context-free languages, making it a robust choice for parsing in compiler design.