AST

func name=_fib addr=0xaddr type=int args=int	int fib(int n)
{						{
  addsymbol n=0xaddr type=int			
  if addr=0xaddr					if
    '<' addr=... type=char				    <
      symbol n=... type int					n
      constant 2						2
    '==' label=true0					goto true0 if yes
    '!=' label=false0					goto false0 if no
  label addr=0xaddr				
    symbol true0 addr=...				true0:
  return type int, symbol n addr=... 			return n;

  label addr=...
    symbol false0 addr=...				false0:
  return type int					return (
    '+' addr=... type=int				+
      func_call type=int
        symbol fib addr=... type=int_function			fib(n-1)
        '-'
          symbol n addr=...
          const = 1
      func_call type=int
        symbol fib addr=... type=int_function			fib(n-2)
        '-'
          symbol n addr=....
          const = 2
}
func main, etc..................
................