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| | #REDIRECT[[Bottom-Up_Parsing]] |
| == Exercise 1 ==
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| Consider the following grammar, where S is the initial symbol and { a, b } is the set of terminal symbols:
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| <text>
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| S -> G b b | a a b | b G a
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| G -> a
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| </text>
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| # Compute the set of LALR(1) states for the grammar. Build the corresponding LALR(1) parse table. | |
| # Show the parsing process for input '''baaabb''' (including the actions/gotos and the input and stack states). In case of conflict, assume YACC's behavior.
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| # Is this an SLR(1) grammar? Why?
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| == Exercise 2 ==
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| Consider the following grammar, where E is the initial symbol and { [, ], ;, id } is the set of terminal symbols:
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| <text>
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| E -> [ E ; L ] | id
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| L -> E | E ; L
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| </text>
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| # Compute the set of LALR(1) states for the grammar. Build the corresponding LALR(1) parse table.
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| # Show the parsing process for input '''[id;id;id]''' (including the actions/gotos and the input and stack states). In case of conflict, assume YACC's behavior.
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| # Is this an LL(1) grammar? Why?
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| == Exercise 3 ==
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| Consider the following grammar, where S is the initial symbol and { e, i, x } is the set of terminal symbols:
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| <text>
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| S -> i S | i S e S | x
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| </text>
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| # Compute the set of LALR(1) states for the grammar. Build the corresponding LALR(1) parse table.
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| # Compact the parse table, eliminating and propagating reductions.
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| # Show the parsing process for input '''ixixex''' (including the actions/gotos and the input and stack states). In case of conflict, assume YACC's behavior.
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| # Is this an SLR(1) grammar? Why?
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| == Exercise 4 (test) ==
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| Consider the following grammar, where A is the initial symbol and { x, y, z } is the set of terminal symbols:
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| <text>
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| A -> B y y | z z x | x B x
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| B -> z | ε
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| </text>
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| # Compute the set of LALR(1) states for the grammar. Build the corresponding LALR(1) parse table.
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| # Compact the parse table, eliminating and propagating reductions.
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| # Show the parsing process for input '''xx''' (including the actions/gotos and the input and stack states). In case of conflict, assume YACC's behavior.
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| == Exercise 5 (test) ==
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| Consider the following grammar, where A is the initial symbol and { x, y, z } is the set of terminal symbols:
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| <text>
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| A -> B x y | x y x | x B y
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| B -> z | ε
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| </text>
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| # Compute the set of LALR(1) states for the grammar. Build the corresponding LALR(1) parse table.
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| # Compact the parse table, eliminating and propagating reductions.
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| # Show the parsing process for input '''xzy''' (including the actions/gotos and the input and stack states). In case of conflict, assume YACC's behavior.
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| == Exercise 6 (test) ==
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| Consider the following grammar, where A is the initial symbol and { x, y, z } is the set of terminal symbols:
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| <text>
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| A -> A B A x | A y | z
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| B -> x | z B
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| </text>
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| # Compute the set of LALR(1) states for the grammar. Build the corresponding LALR(1) parse table.
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| # Compact the parse table, eliminating and propagating reductions.
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| # Show the parsing process for input '''zzxzyx''' (including the actions/gotos and the input and stack states). In case of conflict, assume YACC's behavior.
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| == Answers ==
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| * [http://www.l2f.inesc-id.pt/~david/ist/docencia/compiladores/2007-2008/lalr1-ex123.pdf Answers to exercises 1, 2, and 3]
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| * [[Answers to LALR(1) Tests]]
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| [[category:Compilers]]
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| [[category:IST]]
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