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CS606 - Compiler Construction - Lecture Handout 33

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Implementing Ad-Hoc Scheme

The parser needs a mechanism to pass values of attributes from definitions in one snippet to uses in another. We will adopt notation used by YACC for snippets and passing values. Recall that the skeleton LR(1) parser stored two values on the stack 〈symbol,state〉.
We can replace this with triples 〈value,symbol,state〉. On a reduction by A → β, the parser pops 3×|β| items from the stack rather than 2×|β|. It pushes value along with the symbol.