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The phase that first creates a symbol table entry for an identifier is usually

  • A.the linker, when references between modules are resolved
  • B.the optimiser, when the name is found to be worth keeping
  • C.the scanner, at the moment the identifier is first recognised
  • D.the code generator, when storage is finally allocated for it

Answer: C

Correct answer: the scanner, at the moment the identifier is first recognised

The scanner recognises the identifier and enters it in the table, returning a pointer to the entry as part of the token. Later phases fill in the attributes as they become known: the parser and semantic analyser supply type and scope, and the code generator the storage.

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