Identifiers

Identifiers are used to name labels, constants, variables, and other program objects.

An identifier may contain only the following characters:

• Latin letters (A-Z, a-z);
• digits (0-9);
• the underscore character (_).

The first character of an identifier must be either a Latin letter or an underscore (_). An identifier cannot begin with a digit.

Examples of valid identifiers:

_start
main
message
loop1
_tmp

Examples of invalid identifiers:

1loop
my-variable
hello world

Case Sensitivity

Identifiers in RASM are case-sensitive.

For example, the following identifiers are considered different:

main:
Main:
MAIN:

In contrast, instruction mnemonics and register names are case-insensitive.

The following statements are equivalent:

mov rax, 0
MOV RAX, 0
Mov RaX, 0

Allowed Characters

In the current version of RASM, identifiers support only ASCII characters:

• Latin letters (A-Z, a-z);
• digits (0-9);
• the underscore character (_).

Unicode characters (such as Cyrillic letters, CJK characters, or emoji) are not supported in identifiers.