Inherited Attributes
An inherited attribute at a node in parse tree is defined using the attribute values at the parent or siblings. Inherited attributes are convenient for expressing the dependence of a programming language construct on the context in which it appears. For example, we can use an inherited attribute to keep track of whether an identifier appears on the left or the right side of an assignment in order to decide whether the address or the value of the identifier is needed.
| Production rule | Semantic rule |
|---|---|
| S → T L | L.in:=T.type |
| T → int | T.type:=integer |
| T → float | T.type:=float |
| T → char | T.type:=char |
| T → double | T.type:=double |
| L → L1, id | L1.in=L.in
enter_type(id.entry, L.in) |
| L → id | enter_type(id.entry, L.in) |
Read more about this topic: Attribute Grammar
Famous quotes containing the words inherited and/or attributes:
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