Описание тега symbol-table
A `symbol table` is a data structure that maps each identifier in a program's source code to information relating to its declaration or appearance in the source.
A symbol table is used by a language translator (compiler, interpreter...) for associating each identifier in a program's source code with information relating to its declaration or appearance in the source (type, scope level, sometimes location...).
A common implementation technique is to use a hash table implementation. A compiler may use one large symbol table for all symbols or use separated, hierarchical symbol tables for different scopes.