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Explain the need for the A:B notation on the left-hand sides of productions in a tree grammar. Why isn’t similar notation required for context-free grammars? A potential objection to the tree...
May 19, 2022
Write an attribute grammar based on the CFG of Figure 4.11 that will build a syntax tree with the structure described in Figure 4.14. Augment the attribute grammar of Figure 4.5, Figure 4.6, or...
May 19, 2022
Write an algorithm to determine whether the rules of an arbitrary attribute grammar are noncircular. (Your algorithm will require exponential time in the worst case [JOR75].) Rewrite the attribute...
May 19, 2022
Write an LL(1) grammar with action routines and automatic attribute space management that generates the reverse Polish translation described in Exercise 4.7. (a) Write a context-free grammar for...
May 19, 2022
A CFG-based attribute evaluator capable of handling non-L-attributed attribute flow needs to take a parse tree as input. Explain how to build a parse tree automatically during a top-down or bottom-up...
May 19, 2022
Consider the following attribute grammar for variable declarations, based on the CFG of Exercise 2.11: Show a parse tree for the string A, B : C;. Then, using arrows and textual...
May 19, 2022
Refer back to the context-free grammar of Exercise 2.13. Add attribute rules to the grammar to accumulate into the root of the tree a count of the maximum depth to which parentheses are nested in the...
May 19, 2022
Give two examples of reasonable semantic rules that cannot be checked at reasonable cost, either statically or by compiler-generated code at run time. Write an S-attributed attribute grammar, based on...
May 19, 2022
What sort of information do action routines typically keep in global variables, rather than in attributes? Describe the similarities and differences between context-free grammars and tree grammars....
May 19, 2022
What is the difference between a semantic function and an action routine? Why can’t action routines be placed at arbitrary locations within the righthand side of productions in an LR CFG? What...
May 19, 2022

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