Syntax Directed Definition
A syntax directed definition is a context-free grammar in which
- Each grammar symbol X is associated with two finite sets of values: the synthesized attributes of X
and the inherited attributes of X. - Each productions A → α is associated with a finite set of expressions of the form
b!=f(C1, ….., Ck)
Called semantic rules where f is a function and
-
- either b is a synthesized attribute of A and the values C1, ….., Ck are attributes of the grammar
symbols of α or A. - or b is inherited attributes of a grammar symbol of α and the values C1, ….., Ck are attributes of
the grammar symbols of α or A.
- either b is a synthesized attribute of A and the values C1, ….., Ck are attributes of the grammar
- Each terminal symbol has no inherited attributes
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