Difference between s-attributed definition and l-attributed definition
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S-Attributed Grammars are a class of attribute grammars characterized by having no inherited attributes. ... Yacc is based on the S-attributed approach. Any S-attributed grammar is also an L-attributed grammar. In L-attributed grammars attribute evaluation can be performed in left-to-right traversal.
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S-attributed SDT As depicted above, attributes in S-attributed SDTs are evaluated in bottom-up parsing, as the values of the parent nodes depend upon the values of the child nodes. L-attributed SDT This form of SDT uses both synthesized and inherited attributes with restriction of not taking values from right siblings.
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