(import (chicken io)
(chicken string)
(chicken random)
+ (chicken condition)
matchable)
;;; Constants
(define ((make-instr opcode modifier A-mode A-num B-mode B-num name) . args)
(match args
(('copy n) (make-instr opcode modifier A-mode A-num B-mode B-num n))
+ (('copy-from! other n)
+ (set! opcode (other 'opcode))
+ (set! modifier (other 'modifier))
+ (set! A-mode (other 'A-mode))
+ (set! A-num (other 'A-num))
+ (set! B-mode (other 'B-mode))
+ (set! B-num (other 'B-num))
+ (set! name n))
(('opcode) opcode)
(('modifier) modifier)
(('A-mode) A-mode)
(('B-num) B-num)
(('name) name)
(('print) (print opcode
- (if (null? modifier) "" (conc "." modifier))
+ "." modifier
" " (mode-string A-mode) A-num
", " (mode-string B-mode) B-num
(if (null? name) "" (conc " ; " name))))
(define (mode-string mode)
(case mode
((immediate) "#")
- ((direct) "")
- ((indirect-A "*"))
- ((indirect-B "@"))
- ((pre-indirect-A "{"))
- ((pre-indirect-B "<"))
- ((post-indirect-A "}"))
- ((post-indirect-B ">"))))
+ ((direct) "$")
+ ((indirect-A) "*")
+ ((indirect-B) "@")
+ ((pre-indirect-A) "{")
+ ((pre-indirect-B) "<")
+ ((post-indirect-A) "}")
+ ((post-indirect-B) ">")))
(define initial-instruction
- (make-instr 'DAT '() 'immediate 0 'immediate 0 '()))
+ (make-instr 'DAT 'F 'immediate 0 'immediate 0 '()))
;;; Memory setup and addressing
(define core (make-vector core-size '()))
+(define (core-get i)
+ (vector-ref core i))
+
+(define (core-set! i x)
+ (vector-set! core i x))
+
(define (initialize-core)
(let loop ((i 0))
(unless (>= i core-size)
- (vector-set! core i (initial-instruction 'copy '()))
+ (core-set! i (initial-instruction 'copy '()))
(loop (+ i 1)))))
-(define (core-dump)
+(define (dump-core)
(let loop ((i 0))
(unless (>= i core-size)
- ((vector-ref core i) 'print)
+ (print* i ":\t")
+ ((core-get i) 'print)
(loop (+ i 1)))))
(define (addr+ . args)
(let loop ((ptr addr)
(instrs (prog-instrs prog)))
(unless (null? instrs)
- (vector-set! core ptr ((car instrs) 'copy (prog-name prog)))
+ (core-set! ptr ((car instrs) 'copy (prog-name prog)))
(loop (addr+ ptr 1) (cdr instrs))))
(make-player (prog-name prog)
(addr+ addr (prog-offset prog))))
(remaining prog-len))
(if (= remaining 0)
#t
- (if (null? ((vector-ref core ptr) 'name))
+ (if (null? ((core-get ptr) 'name))
(loop (addr+ ptr 1)
(- remaining 1))
#f))))
(define (make-player name ptr)
(list name ptr))
+(define (player-name player) (car player))
+(define (player-ptrs player) (cdr player))
+
(define (player-set-ptrs! player ptrs)
- (set-cdr! prog-queue ptrs))
+ (set-cdr! player ptrs))
;;; Executive function
;;
-(define (run players step)
+(define (run players steps-left)
(cond
- ((> step max-steps) players) ;Tie between remaining players
- ((<= (length players) 1) players) ;There's only one player left who thus wins
+ ((<= steps-left 0) players) ;Tie between remaining players
+ ;; ((<= (length players) 1) players) ;There's only one player left who thus wins
(else
- (let ((player (car players))
- (other-players (cdr players))
- (ptrs (player-ptrs player)))
- (let ((new-ptrs (execute-instr (car ptrs))))
- (if (null? new-ptrs)
- (run other-players (+ step 1))
- (begin
- (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))
+ (let* ((player (car players))
+ (other-players (cdr players))
+ (ptrs (player-ptrs player))
+ (new-ptrs (execute-instr (car ptrs) (player-name player))))
+ (if (null? new-ptrs)
+ (run other-players (- steps-left 1))
+ (begin
+ (player-set-ptrs! player (append (cdr ptrs) new-ptrs))
+ (run (append other-players (list player)) (- steps-left 1))))))))
+
+(define (execute-instr ptr name)
+ (let* ((instr (core-get ptr))
+ (A-ptr (eval-operand (instr 'A-mode) (instr 'A-num) ptr))
+ (B-ptr (eval-operand (instr 'B-mode) (instr 'B-num) ptr))
+ (modifier (instr 'modifier)))
+ (case (instr 'opcode)
+ ((DAT)
+ '()) ;Game over, man, game over!
+ ((MOV)
+ (if (eq? modifier 'I)
+ ((core-get B-ptr) 'copy-from! (core-get A-ptr) name)
+ (combine A-ptr B-ptr modifier name (lambda (x y) y)))
+ (list (addr+ ptr 1)))
+ ((ADD)
+ (combine-and-store A-ptr B-ptr modifier name addr+)
+ (list (addr+ ptr 1)))
+ ((SUB)
+ (combine-and-store A-ptr B-ptr modifier name
+ (lambda (x y) (addr+ x (- y))))
+ (list (addr+ ptr 1)))
+ ((MUL)
+ (combine-and-store A-ptr B-ptr modifier name
+ (lambda (x y) (modulo (* (addr+ x core-size)
+ (addr+ y core-size))
+ core-size)))
+ (list (addr+ ptr 1)))
+ ((DIV)
+ (condition-case
+ (begin
+ (combine-and-store A-ptr B-ptr modifier name
+ (lambda (x y) (quotient (addr x core-size)
+ (addr y core-size))))
+ (list (addr+ ptr 1)))
+ ((exn arithmetic) '())))
+ ((MOD)
+ (condition-case
+ (begin
+ (combine-and-store A-ptr B-ptr modifier name
+ (lambda (x y) (remainder (addr x core-size)
+ (addr y core-size))))
+ (list (addr+ ptr 1)))
+ ((exn arithmetic) '())))
+ ((JMP)
+ (list (addr+ ptr ((core-get A-ptr) 'A-num))))
+ ((JMZ))
((JMN))
((DJN))
((SEQ CMP))
((SNE))
((SLT))
((SPL))
- ((NOP))
+ ((NOP) (list (addr+ ptr 1)))
(else
- (error "Unrecognised opcode" (instr-opcode instr))))))
+ (error "Unrecognised opcode" (instr 'opcode))))))
+
+(define (combine-and-store A-ptr B-ptr modifier name f)
+ (case modifier
+ ((A) ((core-get B-ptr) 'set-A-num!
+ (f ((core-get B-ptr) 'A-num) ((core-get A-ptr) 'A-num)) name))
+ ((B) ((core-get B-ptr) 'set-B-num!
+ (f ((core-get B-ptr) 'B-num) ((core-get A-ptr) 'B-num)) name))
+ ((AB) ((core-get B-ptr) 'set-B-num!
+ (f ((core-get B-ptr) 'B-num) ((core-get A-ptr) 'A-num)) name))
+ ((BA) ((core-get B-ptr) 'set-A-num!
+ (f ((core-get B-ptr) 'A-num) ((core-get A-ptr) 'B-num)) name))
+ ((F I) ((core-get B-ptr) 'set-A-num!
+ (f ((core-get B-ptr) 'A-num) ((core-get A-ptr) 'A-num))) name
+ ((core-get B-ptr) 'set-B-num!
+ (f ((core-get B-ptr) 'B-num) ((core-get A-ptr) 'B-num)) name))
+ ((X) ((core-get B-ptr) 'set-A-num!
+ (f ((core-get B-ptr) 'A-num) ((core-get A-ptr) 'B-num)) name)
+ ((core-get B-ptr) 'set-B-num!
+ (f ((core-get B-ptr) 'B-num) ((core-get A-ptr) 'A-num)) name))))
(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)))))
+ ((indirect-A) (addr+ num ((core-get (addr+ ptr num)) 'A-num)))
+ ((indirect-B) (addr+ num ((core-get (addr+ ptr num)) 'B-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))))
+ (let ((aux-instr (core-get (addr+ ptr num))))
+ (instr-set-A-num! aux-instr (addr+ -1 (aux-instr 'A-num)))
+ (addr+ num (aux-instr 'A-num))))
((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))))
+ (let ((aux-instr (core-get (addr+ ptr num))))
+ (instr-set-B-num! aux-instr (addr+ -1 (aux-instr 'B-num)))
+ (addr+ num (aux-instr 'B-num))))
((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)))
+ (let* ((aux-instr (core-get (addr+ ptr num)))
+ (old-A-num (aux-instr 'A-num)))
+ (instr-set-A-num! aux-instr (addr+ 1 (aux-instr 'A-num)))
(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)))
+ (let* ((aux-instr (core-get (addr+ ptr num)))
+ (old-B-num (aux-instr 'B-num)))
+ (instr-set-B-num! aux-instr (addr+ 1 (aux-instr 'B-num)))
(addr+ num old-B-num)))
(else
(error "Unrecognized mode" mode)))))
+
+;;; TEST CODE
+
+(define addressing-test
+ (make-prog 'at (list
+ (make-instr 'DAT 'F 'immediate 42 'immediate 53 'at)
+ (make-instr 'DAT 'F 'immediate 123 'immediate 256 'at)
+ (make-instr 'MOV 'A 'indirect-B 4 'direct 7 'at)
+ (make-instr 'NOP 'I 'immediate 0 'immediate 0 'at)
+ (make-instr 'NOP 'I 'immediate 0 'immediate 0 'at)
+ (make-instr 'NOP 'I 'immediate 0 'immediate 0 'at)
+ (make-instr 'DAT 'F 'immediate -5 'immediate -6 'at)) 2))
+
+(define imp
+ (make-prog 'imp (list (make-instr 'MOV 'I 'direct 0 'direct 1 'imp)) 0))
+
+(define dwarf
+ (make-prog 'dwarf (list
+ (make-instr 'DAT 'F 'immediate 0 'immediate -1 'dwarf)
+ (make-instr 'ADD 'AB 'immediate 5 'direct -1 'dwarf)
+ (make-instr 'MOV 'I 'direct -2 'indirect-B -2 'dwarf)
+ (make-instr 'JMP 'I 'immediate -2 'immediate 0 'dwarf)) 1))
+
+(initialize-core)
+(define players (install-progs (list dwarf imp)))
+
+(dump-core)
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