'Inherited attributes' diaporamas de présentation

Compiler Principle and Technology

Compiler Principle and Technology. Prof. Dongming LU Apr. 2nd, 2014. 6. Semantic Analysis. PART TWO. Semantic Analysis Phase Purpose : compute additional information needed for compilation that is beyond the capabilities of Context-Free Grammars and Standard Parsing Algorithms

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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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L-Attributed Definitions

L-Attributed Definitions. Dewan Tanvir Ahmed Assistant Professor, CSE BUET. Traversals of Parse-trees. Identify a natural traversal that will allow the systematic evaluation of attributes. procedure dfsvisit(n:node) { for each child m of n from left to right do {

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Semantic Analysis

Semantic Analysis. COMP3190: Principle of Programming Languages. Compilation in a Nutshell 1. Source code (character stream). if (b == 0) a = b;. Lexical analysis. if. (. b. ==. 0. ). a. =. b. ;. Token stream. Parsing. if. ;. ==. =. Abstract syntax tree (AST). b. 0. a.

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Honors Compilers

Honors Compilers. Semantic Analysis and Attribute Grammars Mar 5th 2002. Semantic analysis. Enforce context-dependent language rules that are not reflected in the BNF, e.g. a function must have a return statement.

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Semantic analysis

Semantic analysis. Enforce context-dependent language rules that are not reflected in the BNF, e.g. a function must have a return statement. Decorate AST with semantic information for subsequent code generation, e.g. determine types of all expressions

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Semantic analysis

Semantic analysis. Enforce context-dependent language rules that are not reflected in the BNF, e.g. a function must have a return statement. Decorate AST with semantic information for subsequent code generation, e.g. determine types of all expressions

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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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SDTs used to implement SDDs

SDTs used to implement SDDs. A non-cyclic SDD (having definitions of attributes) can always be implemented by a SDT (having actions that assign values to attributes) by arranging that the parser first builds a tree, ignoring the actions of the SDT

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