X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=jars.git;a=blobdiff_plain;f=mars.scm;h=9952774b316837ef878af27bb09830fa49bed687;hp=5ea1fbac5e0a4cbcdf07dc25f5997645664526b9;hb=5ea3ebb09473ba9941d5a3cafdc4cb17d489c3b0;hpb=943e709157da251d669a5a5e59f470a1d6672f79

diff --git a/mars.scm b/mars.scm
index 5ea1fba..9952774 100644
--- a/mars.scm
+++ b/mars.scm
@@ -5,6 +5,8 @@
 (import (chicken io)
         (chicken string)
         (chicken random)
+        (chicken condition)
+        (chicken process context)
         matchable)
 
 ;;; Constants
@@ -17,66 +19,93 @@
 ;;; 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 'opcode))
+       (set! A-mode (other 'A-mode))
+       (set! A-num (other 'A-num))
+       (set! B-mode (other 'B-mode))
+       (set! B-num (other '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 (instr->string instr)
+  (conc opcode
+        "." modifier
+        " " (mode->string A-mode) A-num
+        " " (mode->string B-mode) B-num))
 
 (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 '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 i))
+        ((i v) ((vector-ref core-vec i) v))
+        (('dump)
+         (let loop ((i 0))
+           (unless (>= i core-size)
+             (print* i ":\t")
+             (let ((n (vector-ref names-vec i)))
+               (unless (null? n)
+                 (print* "\t;" n)))
+             (print))))))))
 
 (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)
@@ -86,110 +115,248 @@
 (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))))
 
-(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)
+(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? (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) players)
                     (cdr progs-left))
               (loop players 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 player))
+(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 queues))
+           (new-ptrs (execute-instr core (car ptrs) (queue-owner queue))))
+      (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 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)
+                            ((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 (eval-operand mode num ptr)
+(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 '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)