46 lines
842 B
EBNF
46 lines
842 B
EBNF
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COMMENT: /\/\/[^\n]*/
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!opcode: "nop"i
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| "load"i
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| "store"i
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| "add"i
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| "sub"i
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| "and"i
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| "or"i
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| "not"i
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| "xor"i
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| "seth"i
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| "shr"i
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| "cmp"i
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| "mul"i
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| "beq"i
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| "set"i
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| "bneq"i
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!register: REGISTER
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| "sp"i
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| "lr"i
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| "pc"i
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LABEL: /[a-z_]\w*/i
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REGISTER: /[Rr]\d+/
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start: line*
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?line: label | statement | raw_word | symbol_def
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label: LABEL ":"
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statement: opcode [param ("," param)*]
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!label_ref: LABEL
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!immediate: SIGNED_NUMBER | HEX_LITTERAL
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?param: register | label_ref | reg_offset | immediate
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reg_offset: "[" register ("," immediate)? "]"
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raw_word: ".word" immediate
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symbol_def: ".global" label_ref
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HEX_LITTERAL: /0x[a-fA-F0-9]+/
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%import common.WS
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%import common.SIGNED_NUMBER
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%ignore COMMENT
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%ignore WS
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