An experimental multi-target assembler assembler.
The preparser functions to provide many quality-of-life features that were previously introduced in a single backend. These include:
This feature-set is small to begin with but functions to standardize and consolidate the grammar accross multiple backends, leaving the backend to only handle the mapping to opcodes.
program = ( whitespace | newline )* ( origin | statement )+ ;
statements = statement+ ;
statement = ( whitespace | newline )* ( labeldef | symboldef | expression | instruction | comment ) comment? ( newline | EOF );
instruction = alphabetic ( alphabetic | digit | special | ";"! )+ ;
comment = ";" ( whitespace | character )* ;
referenceid = alphabetic* ;
labeldef = referenceid ":" ;
definition = .define whitespace+ referenceid whitespace+ expression ;
expression = literal | referenceid;
literal = (byte (byte (byte byte?)?)?) ;
origin = ".origin" whitespace+ byte (byte (byte byte?)?)? ;
character = lower|upper|digit|special ;
whitespace = " " | "\t" ;
newline = "\n" ;
alphabetic = (lower|upper) ;
lower = "a"|"b"|"c"|"d"|"e"|"f"|"g"|"h"|"i"|"j"|"k"|"l"|"m"
|"n"|"o"|"p"|"q"|"r"|"s"|"t"|"u"|"v"|"w"|"x"|"y"|"z" ;
upper = "A"|"B"|"C"|"D"|"E"|"F"|"G"|"H"|"I"|"J"|"K"|"L"|"M"
|"N"|"O"|"P"|"Q"|"R"|"S"|"T"|"U"|"V"|"W"|"X"|"Y"|"Z" ;
byte = ( "0x" hex hex ) | digit+ | ( "0b" binarybyte ) | "'" alphabetic "'" ;
hex = "0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"|"a"|"b"|"c"
|"d"|"e"|"f"|"A"|"B"|"C"|"D"|"E"|"F" ;
binarybyte = binary binary binary binary binary binary binary binary ;
binary = "0" | "1" ;
digit = "0"|"1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9" ;
special = "-"|"_"|"\""|"#"|"&"|"’"|"("|")"|"*"|"+"|","|"."|"/"
|":"|";"|"<"|"="|">" ;Please nobody use this. This is entirely an experiment to support insane restrictions I've imposed on myself to build a computer from first principles.
Instead, please use the wonderful vasm project that is better supported, better engineered and WAY more mature... frankly I don't even know why you are even looking at this.