'Synthesized attributes' presentation slideshows

Syntax Directed Translation

Syntax Directed Translation. Chapter 5. LR(k) ? LR(1). Context-Free Languages. Context-free languages. Deterministic languages (LR(k)). LL(k) languages. Simple precedence languages. Operator precedence languages. LL(1) languages. The inclusion hierarchy for context-free languages.

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Lecture 6: YACC and Syntax Directed Translation

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5. Syntax-Directed Translation

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Topic: Syntax Directed Translations

Topic: Syntax Directed Translations. UNIT IV. Syntax-Directed Translations. Translation of languages guided by CFGs Information associated with programming language constructs Attributes attached to grammar symbols

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Topic #5: Translations

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1 ? Basic idea Guided by context-free grammar (Translating when parsing )

Chapter 5 Syntax-Directed Translation Section 0 Approaches to implement Syntax-Directed Translation. 1 ? Basic idea Guided by context-free grammar (Translating when parsing ) Attaching attributes to the grammar symbols representing the program construction.

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??? cwhsueh@csie.ntu.tw csie.ntu.tw/~cwhsueh/ 96 Spring

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Attribute Grammar Professor Yihjia Tsai Tamkang University

Attribute Grammar Professor Yihjia Tsai Tamkang University. Beyond syntax analysis. An identifier named x has been recognized. Is x a scalar, array or function? How big is x? If x is a function, how many and what type of arguments does it take? Is x declared before being used?

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Beyond syntax analysis

Beyond syntax analysis. An identifier named x has been recognized. Is x a scalar, array or function? How big is x? If x is a function, how many and what type of arguments does it take? Is x declared before being used? Where can x be stored? Is the expression x+y type-consistent?

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L-Attributed Definitions

L-Attributed Definitions. Aggelos Kiayias Computer Science & Engineering Department The University of Connecticut 371 Fairfield Road, Unit 1155 Storrs, CT 06269. aggelos@cse.uconn.edu http://www.cse.uconn.edu/~akiayias. Traversals of Parse-trees.

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Attribute Grammars

Attribute Grammars. Recall the yacc program Parse a given expression Evaluate it. expr : expr '+' expr {$$ = $1 + $3;} | expr '-' expr {$$ = $1 - $3;} | expr '*' expr {$$ = $1 * $3;} | expr '/' expr {$$ = $1 / $3;} | '(' expr ')' {$$ = $2;}

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