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Parsing Table Creation for LALR(1), CLR(1) Video Lecture | Compiler Design - Computer Science Engineering (CSE)
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FAQs on Parsing Table Creation for LALR(1), CLR(1) Video Lecture - Compiler Design - Computer Science Engineering (CSE)
| 1. What is an LALR(1) parsing table? |  |
Ans. An LALR(1) parsing table is a data structure used in compiler design to implement the LALR(1) parsing algorithm. It is a two-dimensional table that represents the parsing actions and state transitions of a context-free grammar. Each cell in the table contains either a shift, reduce, or accept action, or a state number indicating the next state to transition to.
| 2. What is a CLR(1) parsing table? | |
Ans. A CLR(1) parsing table is a data structure used in compiler design to implement the CLR(1) parsing algorithm. It is similar to the LALR(1) parsing table but is more powerful in terms of the grammars it can handle. The CLR(1) parsing table contains the parsing actions and state transitions for a context-free grammar, just like the LALR(1) parsing table.
| 3. How is a parsing table created for LALR(1)? | |
Ans. To create a parsing table for LALR(1), we follow these steps:
1. Construct the LR(0) sets of items for the given grammar.
2. Compute the closure and goto operations for the LR(0) sets to generate the LR(1) sets of items.
3. Construct the LALR(1) sets of items by merging compatible LR(1) sets.
4. Compute the parsing actions and state transitions for each LALR(1) set to populate the parsing table.
| 4. What is the purpose of a parsing table in compiler design? | |
Ans. The parsing table in compiler design is a crucial component of the parsing algorithm. It guides the parser during the syntactic analysis phase to determine the next parsing action based on the current state and input symbol. The parsing actions in the table can be shift (move to the next input symbol), reduce (apply a production rule), or accept (successfully parse the input). The parsing table enables efficient and accurate parsing of the input according to the grammar rules.
| 5. How does the construction of a CLR(1) parsing table differ from an LALR(1) parsing table? | |
Ans. The construction of a CLR(1) parsing table differs from an LALR(1) parsing table in the following ways:
1. The CLR(1) parsing table is based on the LR(1) sets of items, which are more comprehensive than the LR(0) sets used in LALR(1).
2. The CLR(1) parsing table handles more complex grammars and can detect more parsing conflicts.
3. The construction of a CLR(1) parsing table involves additional steps, such as computing lookahead sets for each LR(1) item, to determine the parsing actions accurately.
4. Due to the increased complexity, the CLR(1) parsing table construction may result in a larger table compared to the LALR(1) parsing table.
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Nov 19, 2024 Last updated |
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