(import (chicken io)
(chicken string)
- matchable)
+ (chicken random)
+ (chicken condition)
+ matchable
+ wish)
;;; Constants
;;
-(define core-size 8000)
+(define core-size 20)
(define max-steps 10000)
-;;; Memory setup
+;;; Instructions
;;
-(define core (make-vector core-size '()))
+(define (make-instr opcode modifier A-mode A-num B-mode B-num name)
+ (list opcode modifier A-mod A-num B-mode B-num name))
+(define (instr-opcode instr) (list-ref instr 0))
+(define (instr-modifier instr) (list-ref instr 1))
+(define (instr-A-mode instr) (list-ref instr 2))
+(define (instr-A-num instr) (list-ref instr 3))
+(define (instr-B-mode instr) (list-ref instr 4))
+(define (instr-B-num instr) (list-ref instr 5))
+(define (instr-name instr) (list-ref instr 6))
-;;; Instructions
+(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 (instr->string opcode modifier A-mode A-num B-mode B-num name)
+ (conc opcode
+ "." modifier
+ " " (mode->string A-mode) A-num
+ " " (mode->string B-mode) B-num
+ " ;" name))
+
+(define initial-instruction
+ (make-instr 'DAT 'F 'immediate 0 'immediate 0 '()))
+
+
+;;; Memory setup and addressing
;;
-(define (make-instr opcode modifier addrA modeA addrB modeB))
+(define (make-core core-size opcode modifier A-mode A-num B-mode B-num)
+ (let ((opcodes (make-vector core-size opcode))
+ (modifiers (make-vector core-size modifier))
+ (A-modes (make-vector core-size A-mode))
+ (A-nums (make-vector core-size A-num))
+ (B-modes (make-vector core-size B-mode))
+ (B-nums (make-vector core-size B-num))
+ (names (make-vector core-size '())))
+ (lambda args
+ (match args
+ ((i 'copy-to j n)
+ (vector-set! opcodes j (vector-ref opcodes i))
+ (vector-set! modifiers j (vector-ref modifiers i))
+ (vector-set! A-modes j (vector-ref A-modes i))
+ (vector-set! A-nums j (vector-ref A-nums i))
+ (vector-set! B-modes j (vector-ref B-modes i))
+ (vector-set! B-nums j (vector-ref B-nums i))
+ (vector-set! names j n))
+ ((i 'copy-from-instr! instr)
+ (vector-set! opcodes i (instr-opcode instr))
+ (vector-set! modifiers i (instr-modifier instr))
+ (vector-set! A-mode i (instr-A-mode instr))
+ (vector-set! A-num i (instr-A-num instr))
+ (vector-set! B-mode i (instr-B-mode instr))
+ (vector-set! B-num i (instr-B-num instr))
+ (vector-set! names i (instr-name instr)))
+ ((i 'opcode) (vector-ref opcodes i))
+ ((i 'modifier) (vector-ref modifiers i))
+ ((i 'A-mode) (vector-ref A-modes i))
+ ((i 'A-num) (vector-ref A-nums i))
+ ((i 'B-mode) (vector-ref B-modes i))
+ ((i 'B-num) (vector-ref B-nums i))
+ ((i 'name) (vector-ref names i))
+ ((i 'set-opcode! x n) (vector-set! opcodes i x) (vector-set! names i n))
+ ((i 'set-modifier! x n) (vector-set! modifiers i x) (vector-set! names i n))
+ ((i 'set-A-mode! x n) (vector-set! A-modes i x) (vector-set! names i n))
+ ((i 'set-A-num! x n) (vector-set! A-nums i x) (vector-set! names i n))
+ ((i 'set-B-mode! x n) (vector-set! B-modes i x) (vector-set! names i n))
+ ((i 'set-B-num! x n) (vector-set! B-nums i x) (vector-set! names i n))
+ (('dump)
+ (let loop ((i 0))
+ (unless (>= i core-size))
+ (print* i ":\t")
+ (instr->string (vector-ref opcodes i)
+ (vector-ref modifiers i)
+ (vector-ref A-modes i)
+ (vector-ref A-nums i)
+ (vector-ref B-modes i)
+ (vector-ref B-nums i)
+ (vector-ref names i))))))))
+(define (addr+ . args)
+ (foldl (lambda (a b)
+ (modulo (+ a b core-size) core-size))
+ 0 args))
-;;; Players
+;;; Programmes
;;
-(define (make-player name . ptrs)
- (cons name ptrs))
+(define (make-prog name instrs offset)
+ (list name instrs offset))
-(define (player-ptrs player)
- (cdr player))
+(define (prog-name prog) (list-ref prog 0))
+(define (prog-instrs prog) (list-ref prog 1))
+(define (prog-offset prog) (list-ref prog 2))
-(define (player-name player)
- (car player))
+(define (install-prog core prog addr)
+ (let loop ((ptr addr)
+ (instrs (prog-instrs prog)))
+ (unless (null? instrs)
+ (core ptr 'copy-from-instr! (car instrs))
+ (loop (addr+ ptr 1) (cdr instrs))))
+ (make-player (prog-name prog)
+ (addr+ addr (prog-offset prog))))
+
+(define (can-install-prog? core prog-len addr)
+ (let loop ((ptr addr)
+ (remaining prog-len))
+ (if (= remaining 0)
+ #t
+ (if (null? (core ptr 'name))
+ (loop (addr+ ptr 1)
+ (- remaining 1))
+ #f))))
+
+(define (install-progs core progs)
+ (let loop ((players '())
+ (progs-left progs))
+ (if (null? progs-left)
+ players
+ (let ((addr (pseudo-random-integer core-size))
+ (prog (car progs-left)))
+ (if (can-install-prog? core (length (prog-instrs prog)) addr)
+ (loop (cons (install-prog core prog addr) players)
+ (cdr progs-left))
+ (loop players progs-left))))))
+
+(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! player ptrs))
-;;; Main loop
+;;; Executive function
;;
-(define (run players step)
+(define (run players steps-left)
(cond
- ((> step max-steps) players) ;Tie between remaining players
- ((null? players) '()) ;Somehow we have no players remaining
+ ((<= 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)))
- (if (null? ptrs)
- (run other-players (+ step 1)) ;Player is out
- (let* ((ptrs (player-ptrs player))
- (new-ptrs (execute-instr (car ptrs))))
- (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)))
- (case (instr-opcode instr)
- ((DAT))
- ((MOV))
- ((ADD))
- ((SUB))
- ((MUL))
- ((DIV))
- ((MOD))
- ((JMP))
- ((JMN))
- ((DJN))
- ((SEQ CMP))
- ((SNE))
- ((SLT))
- ((SPL))
- ((NOP))
+ (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)
+ (list (addr+ ptr (if (instr-zero? B-ptr modifier #f)
+ ((core-get A-ptr) 'A-num)
+ 1))))
+ ((JMN)
+ (list (addr+ ptr (if (not (instr-zero? B-ptr modifier #f))
+ ((core-get A-ptr) 'A-num)
+ 1))))
+ ((DJN)
+ (list (addr+ ptr (if (not (instr-zero? B-ptr modifier #t))
+ ((core-get A-ptr) 'A-num)
+ 1))))
+ ((SEQ CMP)
+ (list (addr+ ptr (if (compare-instrs A-ptr B-ptr modifier =) 2 1))))
+ ((SNE)
+ (list (addr+ ptr (if (compare-instrs A-ptr B-ptr modifier =) 1 2))))
+ ((SLT)
+ (list (addr+ ptr (if (compare-instrs A-ptr B-ptr modifier <) 2 1))))
+ ((SPL)
+ (list (addr+ ptr 1) (addr+ ptr ((core-get A-ptr) 'A-num))))
+ ((NOP)
+ (list (addr+ ptr 1)))
(else
- (error "Unrecognised opcode" (instr-opcode instr))))))
-
+ (error "Unrecognised opcode" (instr 'opcode))))))
+
+(define (compare-instrs A-ptr B-ptr modifier test)
+ (let ((A-instr (core-get A-ptr))
+ (B-instr (core-get B-ptr)))
+ (case modifier
+ ((A) (test (A-instr 'A-num) (B-instr 'A-num)))
+ ((B) (test (A-instr 'B-num) (B-instr 'B-num)))
+ ((AB) (test (A-instr 'A-num) (B-instr 'B-num)))
+ ((BA) (test (A-instr 'B-num) (B-instr 'A-num)))
+ ((F) (and
+ (test (A-instr 'A-num) (B-instr 'A-num))
+ (test (A-instr 'B-num) (B-instr 'B-num))))
+ ((X) (and
+ (test (A-instr 'A-num) (B-instr 'B-num))
+ (test (A-instr 'B-num) (B-instr 'A-num))))
+ ((I) (and
+ (if (eq? test =)
+ (and
+ (eq? (A-instr 'opcode) (B-instr 'opcode))
+ (eq? (A-instr 'modifier) (B-instr 'modifier))
+ (eq? (A-instr 'A-mode) (B-instr 'B-mode))
+ (eq? (A-instr 'B-mode) (B-instr 'A-mode)))
+ #t)
+ (test (A-instr 'A-num) (B-instr 'B-num))
+ (test (A-instr 'B-num) (B-instr 'A-num)))))))
+
+(define (instr-zero? ptr modifier decrement)
+ (let ((instr (core-get ptr)))
+ (case modifier
+ ((A AB)
+ (if decrement (instr 'set-A-num! (addr+ (instr 'A-num) -1)))
+ (= 0 (instr 'A-num)))
+ ((A AB)
+ (if decrement (instr 'set-B-num! (addr+ (instr 'B-num) -1)))
+ (= 0 (instr 'B-num)))
+ ((X I F)
+ (if decrement
+ (begin
+ (instr 'set-A-num! (addr+ (instr 'A-num) -1))
+ (instr 'set-B-num! (addr+ (instr 'B-num) -1))))
+ (and (= 0 (instr 'A-num))
+ (= 0 (instr 'B-num)))))))
+
+(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 ((core-get (addr+ ptr num)) 'A-num)))
+ ((indirect-B) (addr+ num ((core-get (addr+ ptr num)) 'B-num)))
+ ((pre-indirect-A)
+ (let ((aux-instr (core-get (addr+ ptr num))))
+ ((aux-instr set-A-num! (addr+ -1 (aux-instr 'A-num))))
+ (addr+ num (aux-instr 'A-num))))
+ ((pre-indirect-B)
+ (let ((aux-instr (core-get (addr+ ptr num))))
+ (aux-instr set-B-num!(addr+ -1 (aux-instr 'B-num)))
+ (addr+ num (aux-instr 'B-num))))
+ ((post-indirect-A)
+ (let* ((aux-instr (core-get (addr+ ptr num)))
+ (old-A-num (aux-instr 'A-num)))
+ (aux-instr set-A-num! (addr+ 1 (aux-instr 'A-num)))
+ (addr+ num old-A-num)))
+ ((post-indirect-B)
+ (let* ((aux-instr (core-get (addr+ ptr num)))
+ (old-B-num (aux-instr 'B-num)))
+ (aux-instr set-B-num! (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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