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+10 votes

Write syntax directed definitions (semantic rules) for the following grammar to add the type of each identifier to its entry in the symbol table during semantic analysis. Rewriting the grammar is not permitted and semantic rules are to be added to the ends of productions only.

  • $D \rightarrow TL;$
  • $T \rightarrow \text{int}$
  • $T \rightarrow \text{real}$
  • $L \rightarrow L,id$
  • $L \rightarrow id$
in Compiler Design by Veteran (52.1k points)
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$$\begin{array}{|l|l|} \hline \textbf{PRODUCTION RULE} & \textbf{SEMANTIC ACTIONS} \\\hline  D \rightarrow TL  &  \\\hline  T  \rightarrow int & T.type:=integer \\\hline T \rightarrow  real & T.type:=real \\\hline  L \rightarrow L,id & \\&Enter\_type(id.entry,  \\\hline L  \rightarrow  id & Enter\_type(id.entry,  \\\hline \end{array}$$
by (433 points)
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What is

Why two times Enter_Type(id.entry,

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