'Reduce reduce conflicts' presentation slideshows

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Table-driven parsing

Table-driven parsing. Parsing performed by a finite state machine, augmented by a stack . FSM driven by table (s) generated automatically from grammar. Language generator tables. Input. parser. stack. tables. Pushdown Automata.

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Lecture #8, Feb. 7, 2007

Lecture #8, Feb. 7, 2007. Shift-reduce parsing, Shift-reduce and reduce-reduce conflicts, Precedence parsing, LR parsers, LR parsers and FSAs, LR parsing Tables, Sets of Items construction. Invitation. If you have not handed in a homework.

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Syntax error handling Errors can occur at many levels lexical: unknown operator

Syntax error handling Errors can occur at many levels lexical: unknown operator syntactic: unbalanced parentheses semantic: variable never declared runtime: reference a NULL pointer Goals of error-handling in a parser To detect and report the presence of errors

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Bottom-up parsing

Bottom-up parsing. Synthesize tree from fragments Automaton performs two actions: shift : push next symbol on stack reduce : replace symbols on stack Automaton synthesizes ( reduces ) when end of a production is recognized

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Conflicts in Simple LR parsers

197 views • 10 slides