Attribute Grammar ● So,a semantic rule b-fc.c.c indicates that the attribute b depends on attributes cc2...c In a syntax-directed definition,a semantic rule may just evaluate a value of an attribute or it may have some side effects such as printing values. An attribute grammar is a syntax-directed definition in which the functions in the semantic rules cannot have side effects (they can only evaluate values of attributes) CS308 Compiler Theory 7Attribute Grammar • So, a semantic rule b=f(c 1,c 2,…,c n) indicates that the attribute b d d epen ds o n attributes c 1,c 2,…,c n. • In a syntax-directed definition, a semantic rule may just evaluate a val f tt ib t it h id ff t h lue o f an att rib u te or it may have some side effec ts suc h as printing values. • An attribute grammar is a syntax-directed definition in which the functions in the semantic rules cannot have side effects (they can functions in the semantic rules cannot have side effects (they can only evaluate values of attributes). CS308 Compiler Theory 7