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- symbol table is a data structure used by a language translator such as a compiler or interpreter, where each identifier in a program's source code is associated with information relating to its declaration or appearance in the source, such as its type, scope level and sometimes its location.
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A symbol table is an ADT whose values are sets of key-value pairs, with keys all different. Basic symbol-table operations. key: word. Associate a given key with a given value. [If the key is not in the table, add it to the table.] [If the key is in the table, change its value.] Return the value associated with a given key.
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Symbol Table. The data structure that is created and maintained by the compilers for information storing regarding the occurrence of various entities like names of variables, functions, objects, classes. Symbol table is used by both the analysis and the synthesis parts of a compiler.
Symbol Tables, Hash Tables, and String Spaces – 2 Compiler Design – © Muhammed Mudawwar Symbol Table Interface The basic operations defined on a symbol table include: allocate – to allocate a new empty symbol table free – to remove all entries and free the storage of a symbol table
Basic symbol table needs: A function to insert symbols and add attributes to symbols A function to lookup symbols A function to ‘enter’ a new scope A function to ‘exit’ a scope.
The symbol table phase or symbol table management refer to the symbol table’s storage structure, its construction in the analysis phase and its use during the whole compilation.
A compiler maintains two types of symbol tables: a global symbol table which can be accessed by all the procedures and scope symbol tables that are created for each scope in the program. To determine the scope of a name, symbol tables are arranged in hierarchical structure as shown
The symbol table is used to record information about symbols contained in the program. In general the symbol table records variables, complex data types, functions, and procedures. It can also hold keywords, constants, and literals.
