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  1.         cpu     8051
  2.         page    0
  3.  
  4.         ; NOTE: The if construct only works because of short circuit
  5.         ; evaluation of the && operator.  If a symbol is forward-defined,
  6.         ; the lhs will evaluate to false in the first pass, and
  7.         ; the rhs will not be evaluated at all, so no error message
  8.         ; about things having to be defined in pass one:
  9.  
  10. jz      macro   target
  11.         if      (defined(target) || (mompass>1)) && (abs($-(target)) <= 125)
  12.         !jz     target
  13.         elseif
  14.         !jnz    +
  15.         jmp     target
  16.         endif
  17. +
  18.         endm
  19.  
  20. bk2     nop
  21.         db      128 dup (0)
  22. bk1     nop
  23.         jz      bk1
  24.         jz      bk2
  25.         jz      fwd1
  26.         jz      fwd2
  27.         nop
  28.         nop
  29.         nop
  30. fwd1    db      128 dup (0)
  31. fwd2    nop
  32.  
  33.