Symbols

A symbol is a group of characters that represents a value, such as an address, numeric constant, string constant, or character constant. There is no length limit to symbols.

The syntax of a symbol is:

  symbol ::= label | equate

  

In general, symbols have file-wide scope. This means:

1. You can access the symbol from anywhere in the file that includes the symbol definition.
2. You cannot access the symbol from another file.

However, it is possible for symbols to have a different scope, as described in the following sub-sections.

• Labels
  A label is a symbol that represents an address.
• Non-Local Labels
  A non-local label is a symbol that represents an address and has file-wide scope.
• Local Labels
  A local label is a symbol that represents an address and has local scope.
• Relocatable Labels
  Relocatable label expressions.
• Equates
  An equate is a symbol that represents any value.
• Case-Sensitive Identifiers
  Control case-sensitivity for symbols.