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(bits 16)
; local labels via brute force renaming
(! (begin (define my-gensym ; assuming eval allows non-expressions (eg define)
(let ((count 1))
(lambda ()
(let ((new (string->symbol (string-append
"_label"
(number->string count)))))
(set! count (+ count 1))
new))))
'void))
(macro my-local (lambda (name . body)
(define new-sym (my-gensym))
; do the substitution manually,
; instead of relying on a macro to do it,
; because 'direcs' is a directive
; and we want to be able use this in a nested context
(define (deep-replace new old lst)
(cond ((pair? lst) (map (lambda (x)
(deep-replace new old x))
lst))
((eqv? old lst) new)
(else lst)))
`(label ,new-sym ,@(deep-replace new-sym name body))))
(text
(label foo (ret))
(seq (= cx "DO")
(my-local foo
(pop ax)
(cmp ax 0)
(jnz foo)))
(nop)
(jmp foo))
; 00000000 C3 ret
; 00000001 81F9444F cmp cx,0x4f44
; 00000005 7508 jnz 0xf
; 00000007 58 pop ax
; 00000008 3D0000 cmp ax,0x0
; 0000000B 0F85F8FF jnz near 0x7
; 0000000F 90 nop
; 00000010 E9EDFF jmp 0x0
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