Background : Parser uses a CFG Context-free-Grammer to validate the input string and produce output for next phase of the compiler. Output could be either a parse tree or abstract syntax tree. Now to interleave semantic analysis with syntax analysis phase of the compiler, we use Syntax Directed Translation.
Definition Syntax Directed Translation are augmented rules to the grammar that facilitate semantic analysis. The general approach to Syntax-Directed Translation is to construct a parse tree or syntax tree and compute the values of attributes at the nodes of the tree by visiting them in some order.
In many cases, translation can be done during parsing without building an explicit tree. Now, to carry out semantic analysis we will augment SDT rules to this grammar, in order to pass some information up the parse tree and check for semantic errors, if any. Right hand side of the translation rule corresponds to attribute values of right side nodes of the production rule and vice-versa. Generalizing, SDT are augmented rules to a CFG that associate 1 set of attributes to every node of the grammar and 2 set of translation rules to every production rule using attributes, constants and lexical values.
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