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@ -22,38 +22,37 @@
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(let loop ([ptr 0])
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(define inst (for/list ([c (in-string (~r (reg-ref ptr) #:min-width 5 #:pad-string "0"))])
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(string->number (string c))))
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(match-define (list opcode mode-1 mode-2 mode-3)
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(define-values (opcode resolve)
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(match inst
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[(list d4 d3 d2 d1 d0)
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(cons (+ (* 10 d1) d0)
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(for/list ([mode-val (list d2 d3 d4)]
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[offset '(1 2 3)])
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(λ (ptr)
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(define ptr-adjusted (+ ptr offset))
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(match mode-val
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[0 (reg-ref ptr-adjusted)] ; position
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[1 ptr-adjusted] ; immediate
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[2 (+ relative-base (reg-ref ptr-adjusted))]))))])) ; relative
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(values (+ (* 10 d1) d0)
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(λ (ptr offset)
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(define parameter-value (match offset [1 d2] [2 d3] [3 d4]))
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(define ptr-resolver (match parameter-value
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[0 reg-ref] ; position
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[1 values] ; immediate
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[2 (compose1 (λ (ptr) (+ relative-base ptr)) reg-ref)])); relative
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(ptr-resolver (+ ptr offset))))]))
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(define next-ptr
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(match opcode
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[(or 1 2 7 8) ; 4-arity: add & multiply & compare
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(reg-set! (mode-3 ptr) ((match opcode
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[1 +]
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[2 *]
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[7 (binarize <)]
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[8 (binarize =)]) (reg-ref (mode-1 ptr)) (reg-ref (mode-2 ptr))))
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(reg-set! (resolve ptr 3) ((match opcode
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[1 +]
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[2 *]
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[7 (binarize <)]
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[8 (binarize =)]) (reg-ref (resolve ptr 1)) (reg-ref (resolve ptr 2))))
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(+ ptr 4)]
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[(or 3 4 9) ; 2-arity: input & output
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(match opcode
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[3 (reg-set! (mode-1 ptr) (thread-receive))]
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[4 (thread-send calling-thd (reg-ref (mode-1 ptr)))]
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[9 (set! relative-base (+ relative-base (reg-ref (mode-1 ptr))))])
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[3 (reg-set! (resolve ptr 1) (thread-receive))]
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[4 (thread-send calling-thd (reg-ref (resolve ptr 1)))]
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[9 (set! relative-base (+ relative-base (reg-ref (resolve ptr 1))))])
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(+ ptr 2)]
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[(or 5 6) ; 3-arity: jump
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(if ((match opcode
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[5 not]
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[6 values]) (zero? (reg-ref (mode-1 ptr))))
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(reg-ref (mode-2 ptr))
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[6 values]) (zero? (reg-ref (resolve ptr 1))))
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(reg-ref (resolve ptr 2))
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(+ ptr 3))]
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[99 (thread-send calling-thd 'done) (terminate)]
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[_ (error "unknown opcode" opcode)]))
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