Literals

Anvil provides built-in literal forms to represent values commonly used in hardware designs.

Numeric Literals

A numeric literal consists of:

1. A bit width (one or more digits),

2. A single quote ',

3. A base specifier (b, d, or h),

4. A value written in that base.

numeric-literal        ::= $binary-literal
                         | $decimal-literal
                         | $hexadecimal-literal

binary-literal         ::= { $digit }+ 'b { 0 | 1 }+
decimal-literal        ::= { $digit }+ 'd { $digit }+
hexadecimal-literal    ::= { $digit }+ 'h { $digit | a...f | A...F }+

Examples:

8'b10101010
16'hFFEE
8'd170

String Literals

String literals are enclosed in double quotes:

string-literal ::= " { $string-char } "

Example:

"Hello, Anvil!"

Note: String literals are just for debug printing and cannot be manipulated as first-class values in Anvil.