Formal languages

L-attributed grammar

L-attributed grammars are a special type of attribute grammars. They allow the attributes to be evaluated in one depth-first left-to-right traversal of the abstract syntax tree. As a result, attribute evaluation in L-attributed grammars can be incorporated conveniently in top-down parsing. A syntax-directed definition is L-attributed if each inherited attribute of on the right side of depends only on 1. * the attributes of the symbols 2. * the inherited attributes of (but not its synthesized attributes) Every S-attributed syntax-directed definition is also L-attributed. Implementing L-attributed definitions in Bottom-Up parsers requires rewriting L-attributed definitions into translation schemes. Many programming languages are L-attributed. Special types of compilers, the narrow compilers, are based on some form of L-attributed grammar. These are a strict superset of S-attributed grammars. Used for code synthesis. Either "inherited attributes" or "synthesized attributes" associated with the occurrence of symbol . (Wikipedia).

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Related pages

S-attributed grammar | Abstract syntax tree | Top-down parsing | Attribute grammar