X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=jars.git;a=blobdiff_plain;f=mars.scm;h=caccfa17c17225a774171547e878c45d1efa7976;hp=66ec04689749457b5c9a9185cb9b6aeea0c0d1fc;hb=80272dcf66d5e333302fa310c4c346d6af5d503c;hpb=bc3e11db08cc62b131771395a1815a1b91c7ac88

diff --git a/mars.scm b/mars.scm
index 66ec046..caccfa1 100644
--- a/mars.scm
+++ b/mars.scm
@@ -6,93 +6,116 @@
         (chicken string)
         (chicken random)
         (chicken condition)
-        matchable)
-
-;;; Constants
-;;
-
-(define core-size 20)
-(define max-steps 10000)
+        (chicken process-context)
+        matchable wish)
 
 
 ;;; 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))
-    (('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) "$")
-     ((indirect-A) "*")
-     ((indirect-B) "@")
-     ((pre-indirect-A) "{")
-     ((pre-indirect-B) "<")
-     ((post-indirect-A) "}")
-     ((post-indirect-B) ">")))
+(define (make-instr opcode modifier A-mode A-num B-mode B-num)
+  (lambda args
+    (match args
+      (('opcode) opcode)
+      (('modifier) modifier)
+      (('A-mode) A-mode)
+      (('A-num) A-num)
+      (('B-mode) B-mode)
+      (('B-num) B-num)
+      (('make-copy) (make-instr opcode modifier A-mode A-num B-mode B-num))
+      (('set! 'opcode x) (set! opcode x))
+      (('set! 'modifier x) (set! modifier x))
+      (('set! 'A-mode x) (set! A-mode x))
+      (('set! 'A-num x) (set! A-num x))
+      (('set! 'B-mode x) (set! B-mode x))
+      (('set! 'B-num x) (set! B-num x))
+      (('set-from! other)
+       (set! opcode (other 'opcode))
+       (set! modifier (other 'modifier))
+       (set! A-mode (other 'A-mode))
+       (set! A-num (other 'A-num))
+       (set! B-mode (other 'B-mode))
+       (set! B-num (other 'B-num)))
+      (('->string)
+       (conc opcode
+             "." modifier
+             " " (mode->string A-mode) A-num
+             " " (mode->string B-mode) B-num))
+      (else
+       (error "Invalid instr arguments" args)))))
+
+(define (mode->string mode)
+  (case mode
+    ((immediate) "#")
+    ((direct) "$")
+    ((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 'F '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)
-      (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)))))
-
-(define (addr+ . args)
-  (foldl (lambda (a b)
-           (modulo (+ a b core-size) core-size))
-         0 args))
-
-;;; Programmes
+(define (make-core core-size initial-instr . set-functions)
+  (let ((core-vec (make-vector core-size '()))
+        (names-vec (make-vector core-size '())))
+    (define (norm-addr i)
+      (if (< i 0)
+          (norm-addr (+ i core-size))
+          (modulo i core-size)))
+    (define (norm-ref v i)
+      (vector-ref v (norm-addr i)))
+    (define (norm-set! v i x)
+      (vector-set! v (norm-addr i)
+                   (if (integer? x)
+                       (norm-addr x)
+                       x)))
+    (define (run-set-functions i n)
+      (let loop ((remaining-fns set-functions))
+        (unless (null? remaining-fns)
+          ((car remaining-fns) i n))))
+    (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)
+         ((norm-ref core-vec i) 'set-from! (norm-ref core-vec j))
+         (norm-set! names-vec i n)
+         (run-set-functions i n))
+        ((i 'set-from-instr! instr n)
+         ((norm-ref core-vec i) 'set-from! instr)
+         (norm-set! names-vec i n)
+         (run-set-functions i n))
+        ((i 'set! v x n)
+         ((norm-ref core-vec i) 'set! v x)
+         (norm-set! names-vec i n)
+         (run-set-functions i n))
+        ((i 'name) (norm-ref names-vec i))
+        (((? integer? i) v) ((norm-ref core-vec i) v))
+        (('->addr (? integer? i)) (norm-addr i))
+        (('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)))))
+        (('size) core-size)))))
+
+
+;;; Programmes and task queues
 ;;
 
 (define (make-prog name instrs offset)
@@ -102,246 +125,246 @@
 (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)
-      (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))))
+      (core ptr 'set-from-instr! (car instrs) (prog-name prog))
+      (loop (core '->addr (+ ptr 1)) (cdr instrs))))
+  (make-queue (prog-name prog)
+              (core '->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? ((core-get ptr) 'name))
-            (loop (addr+ ptr 1)
+        (if (null? (core ptr 'name))
+            (loop (core '->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
-        (let ((addr (pseudo-random-integer core-size))
+        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-name player) (car player))
-(define (player-ptrs player) (cdr player))
+(define (queue-owner queue) (car queue))
+(define (queue-ptrs queue) (cdr queue))
 
-(define (player-set-ptrs! player ptrs)
-  (set-cdr! player ptrs))
+(define (queue-set-ptrs! queue ptrs)
+  (set-cdr! queue ptrs))
 
 
 ;;; Executive function
 ;;
 
-(define (run players steps-left)
+(define (run core queues steps-left)
   (cond
-   ((<= steps-left 0) 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))
-           (new-ptrs (execute-instr (car ptrs) (player-name player))))
+    (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 other-players (- steps-left 1))
+          (run remaining-queues (- 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)
+            (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-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)))
+           (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 A-ptr B-ptr modifier name addr+)
-       (list (addr+ ptr 1)))
+       (combine-and-store core A-ptr B-ptr modifier name +)
+       (list (core '->addr (+ ptr 1))))
       ((SUB)
-       (combine-and-store A-ptr B-ptr modifier name
-                          (lambda (x y) (addr+ x (- y))))
-       (list (addr+ ptr 1)))
+       (combine-and-store core A-ptr B-ptr modifier name -)
+       (list (core '->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)))
+       (combine-and-store core A-ptr B-ptr modifier name *)
+       (list (core '->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)))
+             (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 A-ptr B-ptr modifier name
-                                (lambda (x y) (remainder (addr x core-size)
-                                                         (addr y core-size))))
-             (list (addr+ ptr 1)))
+             (combine-and-store core A-ptr B-ptr modifier name modulo)
+             (list (core '->addr (+ ptr 1))))
          ((exn arithmetic) '())))
       ((JMP)
-       (list (addr+ ptr ((core-get A-ptr) 'A-num))))
+       (list (core '->addr (+ ptr (core A-ptr 'A-num)))))
       ((JMZ)
-       (list (addr+ ptr (if (instr-zero? B-ptr modifier #f)
-                            ((core-get A-ptr) 'A-num)
-                            1))))
+       (list (core '->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)
-                                 ((core-get A-ptr) 'A-num)
-                                 1)))))
+       (list (core '->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)
-                                 ((core-get A-ptr) 'A-num)
-                                 1)))))
+       (list (core '->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 A-ptr B-ptr modifier =) 2 1))))
+       (list (core '->addr (+ ptr (if (compare-instrs core A-ptr B-ptr modifier =) 2 1)))))
       ((SNE)
-       (list (addr+ ptr (if (compare-instrs A-ptr B-ptr modifier =) 1 2))))
+       (list (core '->addr (+ ptr (if (compare-instrs core A-ptr B-ptr modifier =) 1 2)))))
       ((SLT)
-       (list (addr+ ptr (if (compare-instrs A-ptr B-ptr modifier <) 2 1))))
+       (list (core '->addr (+ ptr (if (compare-instrs core A-ptr B-ptr modifier <) 2 1)))))
       ((SPL)
-       (list (addr+ ptr 1) (addr+ ptr ((core-get A-ptr) 'A-num))))
+       (list (core '->addr (+ ptr 1) (core '->addr (+ ptr (core A-ptr 'A-num))))))
       ((NOP)
-       (list (addr+ ptr 1)))
+       (list (core '->addr (+ ptr 1))))
       (else
        (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)
+(define (compare-instrs core A-ptr B-ptr modifier test)
   (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)))))
+    ((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))))))
+
+;;; Main procedure
+;; 
 
 ;;; 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))
+                   (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 'imp)) 0))
+  (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 '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)))
+                     (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 w (make-wish 640 480))
+(define colours '((imp . "red")
+                  (dwarf . "blue")))
+
+(define core (make-core (* 640 480) (make-instr 'DAT 'F 'immediate 0 'immediate 0)
+                        (lambda (i n)
+                          (set-wish-pixel w
+                                          (remainder i 640)
+                                          (quotient i 640)
+                                          (cdr (assoc n colours))))))
+(define queues (install-progs core (list dwarf imp)))
 
-(dump-core)