Mar15 - CSE302: Compiler Design Instructor: Dr. Liang Cheng...

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CSE302: Compiler Design Instructor: Dr. Liang Cheng Department of Computer Science and Engineering P.C. Rossin College of Engineering & Applied Science Lehigh University March 15, 2007
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 03/15/07 Outline ± Recap ± Top-down parsing (Section 4.4) ± Bottom-up parsing (Section 4.5) ± Summary and homework
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 03/15/07 Top-Down Parsing ± Finding a leftmost derivation for an input string ± Recursive-descent parsing ± Predictive parsing for LL(1) grammars ± Non-recursive version
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 03/15/07 LL(1) Parsing: A Schematic View ± Top-down parsing ± Leftmost derivations and left-sentential forms Parsing stack Input buffer Actions $StartSymbol InputString$ lookahead one token, decide A- production ... ... $$a c c e p t
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 03/15/07 LR Parsing: A Schematic View ± Bottom-up parsing ± Rightmost derivations and right-sentential forms Parsing stack Input buffer Actions $ InputString$ lookahead zero or one token, decide S/R ... ... $StartSymbol $ accept
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Instructor: Dr. Liang Cheng CSE302: Compiler Design 03/15/07 An Example ± Balanced parentheses ± S ( S ) S | ε ± Input string: ( ) ± Parsing stack Input buffer Action …… ±
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Mar15 - CSE302: Compiler Design Instructor: Dr. Liang Cheng...

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