wassembly/design.md

Design

Parsing

• First we tokenize the input (syntax check)
• Then we interpret the input (semantics check)
• Then we execute the input

Notation

• [operation][number type], e.g. divi for divide (div) integer
• %[register] for addressing registers
• $[value] for using literals/immediate values
• ; for end of statement (mandatory)
• [label]: for labels
• Elements must be separated by whitespace character
  • Good: add $2 $5 %A;
  • Bad: add $2$5%A;

Examples

Divide register A by 5 and store the result in register A: divi %A $5 %A;

Reserved symbols

The following whitespace characters are used to separate symbols:

• space (' ')
• tab ('\t')
• return carriage ('\r')
• newline ('\n')

The following characters are used as identifiers:

• dollar ('$')
• percentage ('%')
• colon (':')
• semicolon (';')
• hash ('#')

All operands are reserved keywords and can therefore NOT be used as labels.