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Expressions

An expression specifies an address or numeric value. Whitespace may precede and/or follow an expression.

See the following documentation for more discussion regarding expressions.

Empty Expressions

Integer Expressions

Arguments

Operators

Prefix Operator

Infix Operators

The result of an expression must be an absolute number, or else an off-set into a particular section. If an expression is not absolute, and there is not enough information when as sees the expression to know its section, a second pass over the source program might be necessary to interpret the expression—but the second pass is currently not implemented. as aborts with an error message in this situation.