Stack Machine

commands: push <int|label> - push <1> on stack pop - take arg from stack, save to <1> dup - take arg from stack, push S[0] and S[0] on stack add - take 2 args from stack, push S[0]+S[1] on stack sub - take 2 args from stack, push S[0]-S[1] on stack div - take 2 args from stack, push floor(S[0]/S[1]) on stack mul - take 2 args from stack, push S[0]*S[1] on stack goto <int|label> - jump to <1> ifeq <int|label> - take 2 args from stack, compare them, if 1==2, jump to <1> ifgr <int|label> - take 2 args from stack, compare them, if 1>2, jump to <1> call <int|name|label> - call predefined procedure or go to function - define label <1>