compiler construction - How to get the value of MSB bit of a token returned by LEX -


i have lex specification file below; if input of form r[0-7] return token "reg" yacc file. want "rotate right carry" operation in lex , yacc. need know value of r1[7] , r1[0] can use:

         r1[0] = cf          cf = r1[7]

in yacc file, register values stored in regmem. how define number of bits register , how access them?


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