41 lines
931 B
Markdown
41 lines
931 B
Markdown
# Design
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## Parsing
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- First we tokenize the input (syntax check)
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- Then we interpret the input (semantics check)
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- Then we execute the input
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## Notation
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- `[operation][number type]`, e.g. `divi` for divide (div) integer
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- `%[register]` for addressing registers
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- `$[value]` for using literals/immediate values
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- `;` for end of statement (mandatory)
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- `[label]:` for labels
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- Elements must be separated by whitespace character
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- Good: `add $2 $5 %A;`
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- Bad: `add $2$5%A;`
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## Examples
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Divide register A by 5 and store the result in register A:
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`divi %A $5 %A;`
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## Reserved symbols
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The following whitespace characters are used to separate symbols:
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- space (' ')
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- tab ('\t')
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- return carriage ('\r')
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- newline ('\n')
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The following characters are used as identifiers:
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- dollar ('$')
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- percentage ('%')
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- colon (':')
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- semicolon (';')
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- hash ('#')
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All operands are reserved keywords and can therefore NOT be used as labels.
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