GATE (Graduate Aptitude Test in Engineering) Computer Science & IT (CS) Compiler Design-Basics of Code Optimization Study Material (Page 4 of 5)

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Semantic Analysis: Dependency Graph

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Dependency Graph

Dependency Graphs refers to implementing a Syntax Directed Definition and consists of primarily in finding an order for the evaluation of attributes. Each attribute value must be available when a computation is performed.

Dependency Graphs are the most general technique used to evaluate syntax directed definitions with both synthesized and inherited attributes. A…

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Semantic Analysis: Evaluation Order

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Evaluation Order

Semantic rules in a S-Attributed Definition can be evaluated by a bottom-up, or Post Order, traversal of the parse-tree. Example, the above arithmetic grammar is an example of an S-Attribute Definition. The annotated parse-tree for the input is,

Image Shows Semantic Rules

Evaluation Order: Inherited attributes cannot be evaluated by a simple Pre-Order traversal of the parse-tree. Unlike synthesized a…

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