S-attributed Grammar
S-attributed grammars are a class of
attribute grammars
, comparable with
L-attributed grammars
but characterized by having no inherited attributes at all. Inherited attributes, which must be passed down from parent nodes to children nodes of the
abstract syntax tree
during the
semantic analysis
of the
parsing
process, are a problem for
bottom-up parsing
because in bottom-up parsing, the parent nodes of the abstract syntax tree are created
after
creation of all of their children. Attribute evaluation in S-attributed grammars can be incorporated conveniently in both
top-down parsing
and
bottom-up parsing
.
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