- (player-set-ptrs! (append (cdr ptrs) new-ptrs))
- (run (append other-players (list player)) (+ step 1)))))))))
-
-(define (execute-instr ptr)
- (let* ((instr (vector-ref core ptr))
- (A-pointer (eval-operand (instr-A-mode instr) (instr-A-num) ptr))
- (B-pointer (eval-operand (instr-B-mode instr) (instr-B-num) ptr))
- (modifier (instr-modifier instr)))
- (case (instr-opcode instr)
- ((DAT) '()) ;Game over, man, game over!
- ((MOV))
- ((ADD))
- ((SUB))
- ((MUL))
- ((DIV))
- ((MOD))
- ((JMP))
- ((JMN))
- ((DJN))
- ((SEQ CMP))
- ((SNE))
- ((SLT))
- ((SPL))
- ((NOP))
- (else
- (error "Unrecognised opcode" (instr-opcode instr))))))
-
-(define (eval-operand mode num ptr)
- (addr+ ptr
- (case mode
- ((immediate) 0)
- ((direct) num)
- ((indirect-A) (addr+ num (instr-A-num (vector-ref core (addr+ ptr num)))))
- ((indirect-B) (addr+ num (instr-B-num (vector-ref core (addr+ ptr num)))))
- ((pre-indirect-A)
- (let ((aux-instr (vector-ref core (addr+ ptr num))))
- (instr-set-A-num! aux-instr (addr+ -1 (instr-A-num aux-instr)))
- (addr+ num (instr-A-num aux-instr))))
- ((pre-indirect-B)
- (let ((aux-instr (vector-ref core (addr+ ptr num))))
- (instr-set-B-num! aux-instr (addr+ -1 (instr-B-num aux-instr)))
- (addr+ num (instr-B-num aux-instr))))
- ((post-indirect-A)
- (let* ((aux-instr (vector-ref core (addr+ ptr num)))
- (old-A-num (instr-A-num aux-instr)))
- (instr-set-A-num! aux-instr (addr+ 1 (instr-A-num aux-instr)))
- (addr+ num old-A-num)))
- ((post-indirect-B)
- (let* ((aux-instr (vector-ref core (addr+ ptr num)))
- (old-B-num (instr-B-num aux-instr)))
- (instr-set-B-num! aux-instr (addr+ 1 (instr-B-num aux-instr)))
- (addr+ num old-B-num)))
- (else
- (error "Unrecognized mode" mode)))))
+ (queue-set-ptrs! queue (append (cdr ptrs) new-ptrs))
+ (run-mars core (append remaining-queues (list queue)) (- steps-left 1))))))))
+
+ (define (execute-instr core ptr name)
+ (let* ((A-ptr (eval-operand core (core ptr 'A-mode) (core ptr 'A-num) ptr name))
+ (B-ptr (eval-operand core (core ptr 'B-mode) (core ptr 'B-num) ptr name))
+ (modifier (core ptr 'modifier)))
+ (case (core ptr 'opcode)
+ ((DAT)
+ '()) ;Game over, man, game over!
+ ((MOV)
+ (if (eq? modifier 'I)
+ (core B-ptr 'set-from! A-ptr name)
+ (combine-and-store core A-ptr B-ptr modifier name (lambda (x y) y)))
+ (list (core '->addr (+ ptr 1))))
+ ((ADD)
+ (combine-and-store core A-ptr B-ptr modifier name +)
+ (list (core '->addr (+ ptr 1))))
+ ((SUB)
+ (combine-and-store core A-ptr B-ptr modifier name -)
+ (list (core '->addr (+ ptr 1))))
+ ((MUL)
+ (combine-and-store core A-ptr B-ptr modifier name *)
+ (list (core '->addr (+ ptr 1))))
+ ((DIV)
+ (condition-case
+ (begin
+ (combine-and-store core A-ptr B-ptr modifier name quotient)
+
+ (list (core '->addr (+ ptr 1))))
+ ((exn arithmetic) '())))
+ ((MOD)
+ (condition-case
+ (begin
+ (combine-and-store core A-ptr B-ptr modifier name modulo)
+ (list (core '->addr (+ ptr 1))))
+ ((exn arithmetic) '())))
+ ((JMP)
+ (list (core '->addr (+ ptr (core A-ptr 'A-num)))))
+ ((JMZ)
+ (list (core '->addr (+ ptr (if (instr-zero? B-ptr modifier #f name)
+ (core A-ptr 'A-num)
+ 1)))))
+ ((JMN)
+ (list (core '->addr (+ ptr (if (not (instr-zero? B-ptr modifier #f name))
+ (core A-ptr 'A-num)
+ 1)))))
+ ((DJN)
+ (list (core '->addr (+ ptr (if (not (instr-zero? B-ptr modifier #t name))
+ (core A-ptr 'A-num)
+ 1)))))
+ ((SEQ CMP)
+ (list (core '->addr (+ ptr (if (compare-instrs core A-ptr B-ptr modifier =) 2 1)))))
+ ((SNE)
+ (list (core '->addr (+ ptr (if (compare-instrs core A-ptr B-ptr modifier =) 1 2)))))
+ ((SLT)
+ (list (core '->addr (+ ptr (if (compare-instrs core A-ptr B-ptr modifier <) 2 1)))))
+ ((SPL)
+ (list (core '->addr (+ ptr 1) (core '->addr (+ ptr (core A-ptr 'A-num))))))
+ ((NOP)
+ (list (core '->addr (+ ptr 1))))
+ (else
+ (error "Unrecognised opcode" (core ptr 'opcode))))))
+
+ (define (compare-instrs core A-ptr B-ptr modifier test)
+ (case modifier
+ ((A) (test (core A-ptr 'A-num) (core B-ptr 'A-num)))
+ ((B) (test (core A-ptr 'B-num) (core B-ptr 'B-num)))
+ ((AB) (test (core A-ptr 'A-num) (core B-ptr 'B-num)))
+ ((BA) (test (core A-ptr 'B-num) (core B-ptr 'A-num)))
+ ((F) (and
+ (test (core A-ptr 'A-num) (core B-ptr 'A-num))
+ (test (core A-ptr 'B-num) (core B-ptr 'B-num))))
+ ((X) (and
+ (test (core A-ptr 'A-num) (core B-ptr 'B-num))
+ (test (core A-ptr 'B-num) (core B-ptr 'A-num))))
+ ((I) (and
+ (if (eq? test =)
+ (and
+ (eq? (core A-ptr 'opcode) (core B-ptr 'opcode))
+ (eq? (core A-ptr 'modifier) (core B-ptr 'modifier))
+ (eq? (core A-ptr 'A-mode) (core B-ptr 'B-mode))
+ (eq? (core A-ptr 'B-mode) (core B-ptr 'A-mode)))
+ #t)
+ (test (core A-ptr 'A-num) (core B-ptr 'B-num))
+ (test (core A-ptr 'B-num) (core B-ptr 'A-num))))))
+
+ (define (instr-zero? core ptr modifier decrement name)
+ (case modifier
+ ((A AB)
+ (if decrement (core ptr 'set! 'A-num (- (core ptr 'A-num) 1) name))
+ (= 0 (core ptr 'A-num)))
+ ((A AB)
+ (if decrement (core ptr 'set! 'B-num (- (core ptr 'B-num) 1) name))
+ (= 0 (core ptr 'B-num)))
+ ((X I F)
+ (if decrement
+ (begin
+ (core ptr 'set! 'A-num (- (core ptr 'A-num) 1) name)
+ (core ptr 'set! 'B-num (- (core ptr 'B-num) 1) name)))
+ (and (= 0 (core ptr 'A-num))
+ (= 0 (core ptr 'B-num))))))
+
+ (define (combine-and-store core A-ptr B-ptr modifier name f)
+ (case modifier
+ ((A) (core B-ptr 'set! 'A-num
+ (f (core B-ptr 'A-num) (core A-ptr 'A-num)) name))
+ ((B) (core B-ptr 'set! 'B-num
+ (f (core B-ptr 'B-num) (core A-ptr 'B-num)) name))
+ ((AB) (core B-ptr 'set! 'B-num
+ (f (core B-ptr 'B-num) (core A-ptr 'A-num)) name))
+ ((BA) (core B-ptr 'set! 'A-num
+ (f (core B-ptr 'A-num) (core A-ptr 'B-num)) name))
+ ((F I) (core B-ptr 'set! 'A-num
+ (f (core B-ptr 'A-num) (core A-ptr 'A-num)) name)
+ (core B-ptr 'set! 'B-num
+ (f (core B-ptr 'B-num) (core A-ptr 'B-num)) name))
+ ((X) (core B-ptr 'set! 'A-num
+ (f (core B-ptr 'A-num) (core A-ptr 'B-num)) name)
+ (core B-ptr 'set! 'B-num
+ (f (core B-ptr 'B-num) (core A-ptr 'A-num)) name))))
+
+ (define (eval-operand core mode num ptr name)
+ (core '->addr (+ ptr
+ (case mode
+ ((immediate) 0)
+ ((direct) num)
+ ((indirect-A) (+ num (core (+ ptr num) 'A-num)))
+ ((indirect-B) (+ num (core (+ ptr num) 'B-num)))
+ ((pre-indirect-A)
+ (let ((aux-ptr (+ ptr num)))
+ (core aux-ptr 'set! 'A-num (- (core aux-ptr 'A-num) 1) name)
+ (+ num (core aux-ptr 'A-num))))
+ ((pre-indirect-B)
+ (let ((aux-ptr (+ ptr num)))
+ (core aux-ptr 'set! 'B-num (- (core aux-ptr 'B-num) 1) name)
+ (+ num (core aux-ptr 'B-num))))
+ ((post-indirect-A)
+ (let* ((aux-ptr (+ ptr num))
+ (old-A-num (core aux-ptr 'A-num)))
+ (core aux-ptr 'set! 'A-num (+ (core aux-ptr 'A-num) 1) name)
+ (+ num old-A-num)))
+ ((post-indirect-B)
+ (let* ((aux-ptr (+ ptr num))
+ (old-B-num (core aux-ptr 'B-num)))
+ (core aux-ptr 'set! 'B-num (+ (core aux-ptr 'B-num) 1) name)
+ (+ num old-B-num)))
+ (else
+ (error "Unrecognized mode" mode)))))))
+