where to find a real example on flex and bison ?

Question

i need a n example on flex and bison , so i can learn how to build ast tree and symbol table and do semantic analysis

Answer 1

This link: Using Flex and Bison is really good. It describes how they work and afterwards explains step-by-step how to build a small programming language.

Answer 2

PostgreSQL: http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/