(import (chicken io)
(chicken string)
(chicken random)
+ (chicken condition)
+ (chicken process-context)
matchable)
-;;; Constants
-;;
-
-(define core-size 20)
-(define max-steps 10000)
-
;;; Instructions
;;
-(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))
- (('opcode) opcode)
- (('modifier) modifier)
- (('A-mode) A-mode)
- (('A-num) A-num)
- (('B-mode) B-mode)
- (('B-num) B-num)
- (('name) name)
- (('print) (print opcode
- (if (null? modifier) "" (conc "." modifier))
- " " (mode-string A-mode) A-num
- ", " (mode-string B-mode) B-num
- (if (null? name) "" (conc " ; " name))))
- (('set-opcode! x n) (set! opcode x) (set! name n))
- (('set-modifier! x n) (set! modifier x) (set! name n))
- (('set-A-mode! x n) (set! A-mode x) (set! name n))
- (('set-A-num! x n) (set! A-num x) (set! name n))
- (('set-B-mode! x n) (set! B-mode x) (set! name n))
- (('set-B-num! x n) (set! B-num x) (set! name n))))
-
-(define (mode-string mode)
- (case mode
- ((immediate) "#")
- ((direct) "")
- ((indirect-A "*"))
- ((indirect-B "@"))
- ((pre-indirect-A "{"))
- ((pre-indirect-B "<"))
- ((post-indirect-A "}"))
- ((post-indirect-B ">"))))
+(define (make-instr opcode modifier A-mode A-num B-mode B-num)
+ (lambda args
+ (match args
+ (('opcode) opcode)
+ (('modifier) modifier)
+ (('A-mode) A-mode)
+ (('A-num) A-num)
+ (('B-mode) B-mode)
+ (('B-num) B-num)
+ (('make-copy) (make-instr opcode modifier A-mode A-num B-mode B-num))
+ (('set! 'opcode x) (set! opcode x))
+ (('set! 'modifier x) (set! modifier x))
+ (('set! 'A-mode x) (set! A-mode x))
+ (('set! 'A-num x) (set! A-num x))
+ (('set! 'B-mode x) (set! B-mode x))
+ (('set! 'B-num x) (set! B-num x))
+ (('set-from! other)
+ (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)))
+ (('->string)
+ (conc opcode
+ "." modifier
+ " " (mode->string A-mode) A-num
+ " " (mode->string B-mode) B-num))
+ (else
+ (error "Invalid instr arguments" args)))))
+
+(define (mode->string mode)
+ (case mode
+ ((immediate) "#")
+ ((direct) "$")
+ ((indirect-A) "*")
+ ((indirect-B) "@")
+ ((pre-indirect-A) "{")
+ ((pre-indirect-B) "<")
+ ((post-indirect-A) "}")
+ ((post-indirect-B) ">")
+ (else
+ (error "Unknown mode."))))
(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 (initialize-core)
- (let loop ((i 0))
- (unless (>= i core-size)
- (vector-set! core i (initial-instruction 'copy '()))
- (loop (+ i 1)))))
-
-(define (core-dump)
- (let loop ((i 0))
- (unless (>= i core-size)
- ((vector-ref core i) 'print)
- (loop (+ i 1)))))
+(define (make-core core-size initial-instr)
+ (let ((core-vec (make-vector core-size '()))
+ (names-vec (make-vector core-size '())))
+ (let loop ((i 0))
+ (unless (>= i core-size)
+ (vector-set! core-vec i (initial-instr 'make-copy))
+ (loop (+ i 1))))
+ (lambda args
+ (match args
+ ((i 'set-from! j n)
+ ((vector-ref core-vec i) 'set-from! (vector-ref core-vec j))
+ (vector-set! names-vec i n))
+ ((i 'set-from-instr! instr n)
+ ((vector-ref core-vec i) 'set-from! instr)
+ (vector-set! names-vec i n))
+ ((i 'set! v x n)
+ ((vector-ref core-vec i) 'set! v x)
+ (vector-set! names-vec i n))
+ ((i 'name) (vector-ref names-vec i))
+ ((i v) ((vector-ref core-vec i) v))
+ (('dump)
+ (let loop ((i 0))
+ (unless (>= i core-size)
+ (print* i ":\t" ((vector-ref core-vec i) '->string))
+ (let ((n (vector-ref names-vec i)))
+ (unless (null? n)
+ (print* "\t;" n)))
+ (print)
+ (loop (+ i 1)))))))))
(define (addr+ . args)
(foldl (lambda (a b)
(modulo (+ a b core-size) core-size))
0 args))
-;;; Programmes
+;;; Programmes and task queues
;;
(define (make-prog name instrs offset)
(define (prog-instrs prog) (list-ref prog 1))
(define (prog-offset prog) (list-ref prog 2))
-(define (install-prog prog addr)
+(define (install-prog core prog addr)
(let loop ((ptr addr)
(instrs (prog-instrs prog)))
(unless (null? instrs)
- (vector-set! core ptr ((car instrs) 'copy (prog-name prog)))
+ (core ptr 'set-from-instr! (car instrs) (prog-name prog))
(loop (addr+ ptr 1) (cdr instrs))))
- (make-player (prog-name prog)
- (addr+ addr (prog-offset prog))))
+ (make-queue (prog-name prog)
+ (addr+ addr (prog-offset prog))))
-(define (can-install-prog? prog-len addr)
+(define (can-install-prog? core prog-len addr)
(let loop ((ptr addr)
(remaining prog-len))
(if (= remaining 0)
#t
- (if (null? ((vector-ref core ptr) 'name))
+ (if (null? (core ptr 'name))
(loop (addr+ ptr 1)
(- remaining 1))
#f))))
-(define (install-progs progs)
- (let loop ((players '())
+(define (install-progs core progs)
+ (let loop ((queues '())
(progs-left progs))
(if (null? progs-left)
- players
+ queues
(let ((addr (pseudo-random-integer core-size))
(prog (car progs-left)))
- (if (can-install-prog? (length (prog-instrs prog)) addr)
- (loop (cons (install-prog prog addr) players)
+ (if (can-install-prog? core (length (prog-instrs prog)) addr)
+ (loop (cons (install-prog core prog addr) queues)
(cdr progs-left))
- (loop players progs-left))))))
+ (loop queues progs-left))))))
-(define (make-player name ptr)
+(define (make-queue name ptr)
(list name ptr))
-(define (player-set-ptrs! player ptrs)
- (set-cdr! prog-queue ptrs))
+(define (queue-owner queue) (car queue))
+(define (queue-ptrs queue) (cdr queue))
+
+(define (queue-set-ptrs! queue ptrs)
+ (set-cdr! queue ptrs))
;;; Executive function
;;
-(define (run players step)
+(define (run core queues 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) queues) ;Tie between remaining players
+ ;; ((<= (length queues) 1) queues) ;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))
- ((JMN))
- ((DJN))
- ((SEQ CMP))
- ((SNE))
- ((SLT))
- ((SPL))
- ((NOP))
+ (let* ((queue (car queues))
+ (remaining-queues (cdr queues))
+ (ptrs (queue-ptrs queue))
+ (new-ptrs (execute-instr core (car ptrs) (queue-owner queue))))
+ (if (null? new-ptrs)
+ (run remaining-queues (- steps-left 1))
+ (begin
+ (queue-set-ptrs! queue (append (cdr ptrs) new-ptrs))
+ (run 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 (addr+ ptr 1)))
+ ((ADD)
+ (combine-and-store core A-ptr B-ptr modifier name addr+)
+ (list (addr+ ptr 1)))
+ ((SUB)
+ (combine-and-store core A-ptr B-ptr modifier name
+ (lambda (x y) (addr+ x (- y))))
+ (list (addr+ ptr 1)))
+ ((MUL)
+ (combine-and-store core 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 core 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 core 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 A-ptr 'A-num))))
+ ((JMZ)
+ (list (addr+ ptr (if (instr-zero? B-ptr modifier #f name)
+ (core A-ptr 'A-num)
+ 1))))
+ ((JMN)
+ (list (addr+ ptr (if (not (instr-zero? B-ptr modifier #f name))
+ (core A-ptr 'A-num)
+ 1))))
+ ((DJN)
+ (list (addr+ ptr (if (not (instr-zero? B-ptr modifier #t name))
+ (core A-ptr 'A-num)
+ 1))))
+ ((SEQ CMP)
+ (list (addr+ ptr (if (compare-instrs core A-ptr B-ptr modifier =) 2 1))))
+ ((SNE)
+ (list (addr+ ptr (if (compare-instrs core A-ptr B-ptr modifier =) 1 2))))
+ ((SLT)
+ (list (addr+ ptr (if (compare-instrs core A-ptr B-ptr modifier <) 2 1))))
+ ((SPL)
+ (list (addr+ ptr 1) (addr+ ptr (core A-ptr 'A-num))))
+ ((NOP)
+ (list (addr+ ptr 1)))
(else
- (error "Unrecognised opcode" (instr-opcode instr))))))
+ (error "Unrecognised opcode" (instr 'opcode))))))
-(define (eval-operand mode num ptr)
+(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 (addr+ (core ptr 'A-num) -1) name))
+ (= 0 (core ptr 'A-num)))
+ ((A AB)
+ (if decrement (core ptr 'set! 'B-num (addr+ (core ptr 'B-num) -1) name))
+ (= 0 (core ptr 'B-num)))
+ ((X I F)
+ (if decrement
+ (begin
+ (core ptr 'set! 'A-num (addr+ (core ptr 'A-num) -1) name)
+ (core ptr 'set! 'B-num (addr+ (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)
(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 (addr+ ptr num) 'A-num)))
+ ((indirect-B) (addr+ num (core (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-ptr (addr+ ptr num)))
+ (core aux-ptr 'set! 'A-num (addr+ -1 (core aux-ptr 'A-num)) name)
+ (addr+ num (core aux-ptr '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-ptr (addr+ ptr num)))
+ (core aux-ptr 'set! 'B-num (addr+ -1 (core aux-ptr 'B-num)) name)
+ (addr+ num (core aux-ptr '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-ptr (addr+ ptr num))
+ (old-A-num (core aux-ptr 'A-num)))
+ (core aux-ptr 'set! 'A-num (addr+ 1 (core aux-ptr 'A-num)) name)
(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-ptr (addr+ ptr num))
+ (old-B-num (core aux-ptr 'B-num)))
+ (core aux-ptr 'set! 'B-num (addr+ 1 (core aux-ptr 'B-num)) name)
(addr+ num old-B-num)))
(else
(error "Unrecognized mode" mode)))))
+
+;;; Main procedure
+;;
+
+;;; TEST CODE
+
+(define addressing-test
+ (make-prog 'at (list
+ (make-instr 'DAT 'F 'immediate 42 'immediate 53)
+ (make-instr 'DAT 'F 'immediate 123 'immediate 256)
+ (make-instr 'MOV 'A 'indirect-B 4 'direct 7)
+ (make-instr 'NOP 'I 'immediate 0 'immediate 0)
+ (make-instr 'NOP 'I 'immediate 0 'immediate 0)
+ (make-instr 'NOP 'I 'immediate 0 'immediate 0)
+ (make-instr 'DAT 'F 'immediate -5 'immediate -6)) 2))
+
+(define imp
+ (make-prog 'imp (list (make-instr 'MOV 'I 'direct 0 'direct 1)) 0))
+
+(define dwarf
+ (make-prog 'dwarf (list
+ (make-instr 'DAT 'F 'immediate 0 'immediate -1)
+ (make-instr 'ADD 'AB 'immediate 5 'direct -1)
+ (make-instr 'MOV 'I 'direct -2 'indirect-B -2)
+ (make-instr 'JMP 'I 'immediate -2 'immediate 0)) 1))
+
+(define core (make-core 20 (make-instr 'DAT 'F 'immediate 0 'immediate 0)))
+(define queues (install-progs core (list dwarf imp)))
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