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d09 (stuck)

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Matthew Butterick 4 years ago
parent a370c48b18
commit df4dacafa3
2 changed files with 98 additions and 0 deletions
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97
2019/09.rkt
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#lang br
(require racket/file rackunit)
(define (string->ints str) (map string->number (string-split str #px",\\s*")))
(define (string->regs str) (list->vector (string->ints str)))
(define ((binarize proc) x y) (if (proc x y) 1 0))
(define (make-runner program [calling-thd (current-thread)])
(thread (λ ()
(define regs (string->regs program))
(define (grow-regs! len)
(define newvec (make-vector (add1 len) 0))
(vector-copy! newvec 0 regs)
(set! regs newvec))
(define (reg-ref ptr)
(cond
[(< ptr (vector-length regs)) (vector-ref regs ptr)]
[else
(grow-regs! (add1 ptr))
(reg-ref ptr)]))
(define (reg-set! ptr val)
(cond
[(< (reg-ref ptr) (vector-length regs)) (vector-set! regs (reg-ref ptr) val)]
[else
(grow-regs! (add1 (reg-ref ptr)))
(reg-set! ptr val)]))
(define relative-base 0)
(let/ec terminate
(let loop ([ptr 0])
(define inst (for/list ([c (in-string (~r (reg-ref ptr) #:min-width 5 #:pad-string "0"))])
(string->number (string c))))
(match-define (list opcode mode-1 mode-2 mode-3)
(match #R inst
[(list d4 d3 d2 d1 d0)
(cons (+ (* 10 d1) d0)
(for/list ([mode-val (list d2 d3 d4)]
[offset '(1 2 3)])
(match mode-val
;; position
[0 (λ (ptr) (reg-ref (reg-ref (+ ptr offset))))]
;; immediate
[1 (λ (ptr) (reg-ref (+ ptr offset)))]
;; relative
[2 (λ (ptr) (reg-ref (+ relative-base (reg-ref (+ ptr offset)))))])))]))
(define next-ptr
(match #R opcode
[(or 1 2 7 8) ; 4-arity: add & multiply & compare
(reg-set! (+ ptr 3) ((match opcode
[1 +]
[2 *]
[7 (binarize <)]
[8 (binarize =)]) (mode-1 ptr) (mode-2 ptr)))
(+ ptr 4)]
[(or 3 4 9) ; 2-arity: input & output
(match opcode
[3 (reg-set! (mode-1 ptr) (thread-receive))]
[4 (thread-send calling-thd (mode-1 ptr))]
[9 (set! relative-base (+ relative-base (mode-1 ptr)))])
(+ ptr 2)]
[(or 5 6) ; 3-arity: jump
(if ((match opcode
[5 not]
[6 values]) (zero? (mode-1 ptr)))
(mode-2 ptr)
(+ ptr 3))]
[99 (thread-send calling-thd 'done) (terminate)]
[_ (error "unknown-opcode" opcode)]))
(loop next-ptr))))))
(define (run program-or-thread)
(define thd (match program-or-thread
[(? thread? thd) thd]
[program (make-runner program)]))
(let loop ([acc null])
(match (thread-receive)
['done (reverse acc)]
[msg (loop (cons msg acc))])))
(check-equal?
(run "109,1,204,-1,1001,100,1,100,1008,100,16,101,1006,101,0,99")
'(109 1 204 -1 1001 100 1 100 1008 100 16 101 1006 101 0 99))
(check-equal?
(run "1102,34915192,34915192,7,4,7,99,0")
'(1219070632396864))
(check-equal?
(run "104,1125899906842624,99")
'(1125899906842624))
(define t1 (make-runner (file->string "09.rktd")))
(thread-send t1 1)
(run t1)

1
2019/09.rktd
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