X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=jars.git;a=blobdiff_plain;f=mars.scm;h=39133d25cfbf816f13a8b2b2817d83e864052b80;hp=2f4db9de8672d3b44b66020ad03437e68253f1d5;hb=e676d3621cc68b3fab125b320c8c5efeaf892527;hpb=d77eebde986b6bd5e5c25c40523920dfcac96f13

diff --git a/mars.scm b/mars.scm
index 2f4db9d..39133d2 100644
--- a/mars.scm
+++ b/mars.scm
@@ -4,97 +4,288 @@
 
 (import (chicken io)
         (chicken string)
+        (chicken random)
+        (chicken condition)
         matchable)
 
 ;;; 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) . 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)
+    (('A-num) A-num)
+    (('B-mode) B-mode)
+    (('B-num) B-num)
+    (('name) name)
+    (('print) (print opcode
+                     "." 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) ">")))
 
-;;; Instructions
+(define initial-instruction
+  (make-instr 'DAT 'F 'immediate 0 'immediate 0 '()))
+
+
+;;; Memory setup and addressing
 ;;
 
-(define (make-instr opcode modifier A-mode A-num B-mode B-num))
-(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 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)
+      (core-set! i (initial-instruction 'copy '()))
+      (loop (+ i 1)))))
 
+(define (dump-core)
+  (let loop ((i 0))
+    (unless (>= i core-size)
+      (print* i ":\t")
+      ((core-get i) 'print)
+      (loop (+ i 1)))))
 
-;;; Players
+(define (addr+ . args)
+  (foldl (lambda (a b)
+           (modulo (+ a b core-size) core-size))
+         0 args))
+
+;;; Programmes
 ;;
 
-(define (make-player name . ptrs)
-  (cons name ptrs))
+(define (make-prog name instrs offset)
+  (list name instrs offset))
+
+(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 (install-prog prog addr)
+  (let loop ((ptr addr)
+             (instrs (prog-instrs prog)))
+    (unless (null? instrs)
+      (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))))
 
-(define (player-ptrs player)
-  (cdr player))
+(define (can-install-prog? prog-len addr)
+  (let loop ((ptr addr)
+             (remaining prog-len))
+    (if (= remaining 0)
+        #t
+        (if (null? ((core-get ptr) 'name))
+            (loop (addr+ ptr 1)
+                  (- remaining 1))
+            #f))))
 
-(define (player-name player)
-  (car player))
+(define (install-progs 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? (length (prog-instrs prog)) addr)
+              (loop (cons (install-prog 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
-   ((<= (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-operand (eval-operand (instr-A-mode instr) (instr-A-num) ptr))
-         (B-operand (eval-operand (instr-B-mode instr) (instr-B-num) ptr)))
-    (case (instr-opcode instr)
-      ((DAT))
-      ((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)
-  (case mode
-    ((immediate))
-    ((direct))
-    ((indirect-A))
-    ((indirect-B))
-    ((pre-indirect-A))
-    ((pre-indirect-B))
-    ((post-indirect-A))
-    ((post-indirect-B))))
+  (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))))
+              (instr-set-A-num! aux-instr (addr+ -1 (aux-instr 'A-num)))
+              (addr+ num (aux-instr 'A-num))))
+           ((pre-indirect-B)
+            (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 (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 (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)