272 lines
8.9 KiB
Common Lisp
272 lines
8.9 KiB
Common Lisp
;; "objet" VM.
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;; Instanciation :
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;; (defvar vm (make-vm 100))
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;; Appels de méthode :
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;; (send vm get-memory 42)
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;; (send vm set-memory 42 5)
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;; (send vm get-register R1)
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;; (send vm set-register R2 (send vm get-register 42))
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(defun make-vm (size)
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(let* ((memory (make-array size :initial-element 0))
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(registers `(;; Registres généraux.
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(R0 . 0)
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(R1 . 0)
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(R2 . 0)
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;; Base de la pile.
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(BP . 0)
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;; Sommet de la pile.
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(SP . 0)
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;; Sommet du cadre de la pile
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(FP . 0)
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;; Pointeur de code : fin de la mémoire.
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(PC . ,(- size 1))
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;; registres booléens = faux (nil).
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(PP . nil)
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(EQ . nil)
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(PG . nil)
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;; Quand HALT passe à t, on arrête la machine.
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(HALT . nil)))
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(actions `((get-memory . ,(lambda (index) (aref memory index)))
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(set-memory . ,(lambda (index value) (setf (aref memory index) value)))
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(get-register-list . ,(lambda () (mapcar #'car registers)))
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(get-register . ,(lambda (reg) (cdr (assoc reg registers))))
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(set-register . ,(lambda (reg value) (setf (cdr (assoc reg registers)) value)))
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(size-memory . ,(lambda () (length memory))))))
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(lambda (message &rest params)
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(apply (cdr (assoc message actions)) params))))
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(defun send (obj &rest params)
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(apply obj params))
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(defun get-memory (vm index) (send vm 'get-memory index))
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(defun set-memory (vm index value) (send vm 'set-memory index value))
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(defun get-register-list (vm) (send vm 'get-register-list))
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(defun get-register (vm register) (send vm 'get-register register))
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(defun set-register (vm register value) (send vm 'set-register register value))
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(defun size-memory (vm) (send vm 'size-memory))
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;;TODO : Rajouter une fonction resolve pour resoudre les differents modes d'adresssage.
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;; TODO : Penser a ajouter une table des opcodes
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(defvar table-operateurs
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'(load store move add sub mult div incr decr push pop
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jmp jsr rtn cmp jeq jpg jpp jpe jge jne nop halt))
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(defvar table-modes-adressage
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'(constant direct registre indexé indirect indirect-registre indirect-indexé))
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;; Fonctions de manipulation de bits :
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;; http://psg.com/~dlamkins/sl/chapter18.html
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;; (integer-length n) ≡ ⎡log₂(n)⎤
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;; (ash n décalage) = décalage binaire à gauche (ou droite si négatif)
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;; (logior a b) = ou binaire de a et b.
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(defun position1 (x l) (+ 1 (position x l)))
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(defun split-bytes (n nb-bytes append)
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"Découpe N en plusieurs valeurs inférieures à 256,
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en renvoyant une liste de longueur NB-BYTES,
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et termine par la liste APPEND."
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(if (<= nb-bytes 0)
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append
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(cons (ldb (byte 8 (* 8 (- nb-bytes 1))) n)
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(split-bytes n (- nb-bytes 1) append))))
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(defvar nb-operateurs (length table-operateurs))
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(defvar nb-modes-adressage (length table-modes-adressage))
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(defvar nb-opcode-bytes
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(ceiling (/ (+ (integer-length (+ 1 nb-operateurs))
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(* 2
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(integer-length (+ 1 nb-modes-adressage))))
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;; On divise par 8 car 8 bits dans un byte.
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8)))
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(defun isn-decode (opcode)
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opcode)
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;; Instruction est une liste
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;; '(operateur mode-adressage-1 valeur-1 mode-adressage-2 valeur-2)
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;; Si l'instruction ne prend qu'un (ou zéro) paramètre, les champs
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;; correspondants sont mis à nil.
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;; TODO : encoder en entier les registres de valeur-1 et valeur-2.
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(defun isn-encode (instruction)
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(let ((operateur (first instruction))
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(mode-adressage-1 (second instruction))
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(valeur-1 (third instruction))
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(mode-adressage-2 (fourth instruction))
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(valeur-2 (fifth instruction)))
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(let* ((opcode (position1 operateur table-operateurs))
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(opcode (ash opcode nb-modes-adressage))
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(opcode (logior opcode (position1 mode-adressage-1 table-modes-adressage)))
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(opcode (ash opcode nb-modes-adressage))
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(opcode (logior opcode (position1 mode-adressage-2 table-modes-adressage))))
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(split-bytes opcode nb-opcode-bytes
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(list (if (eq mode-adressage-1 'registre)
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(position1 valeur1 (get-register-list (make-vm 1)))
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valeur1)
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(if (eq mode-adressage-2 'registre)
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(position1 valeur2 (get-register-list (make-vm 1)))
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valeur2))))))
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;;TODO : Faire les registres
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(defun dump-vm (vm)
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(dotimes (i (size-memory vm))
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(let ((val (get-memory vm i)))
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(format T "~&~8,'0x ~2,'0x ~3d ~a" i val val (isn-decode val))))
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(mapcar (lambda (reg)
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(let ((val (get-register vm reg)))
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(format T "~&~4a ~2,'0x ~3d" (string reg) val val)))
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(get-register-list vm))
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(let ((isn (get-memory vm (get-register vm 'PC))))
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(format T "~&Current instruction : ~2,'0x ~a~&" isn (isn-decode isn))))
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(defun ISN-LOAD (vm address register)
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(set-register vm register (get-memory vm address)))
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(defun ISN-STORE (vm register address)
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(set-memory vm address (get-register vm register)))
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(defun ISN-MOVE (vm reg1 reg2)
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(set-register vm reg2 (get-register vm reg1)))
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(defun ISN--OP- (vm op reg1 reg2)
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(set-register vm reg2 (funcall op
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(get-register vm reg2)
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(get-register vm reg1))))
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(defun ISN-ADD (vm reg1 reg2) (ISN--OP- vm #'+ reg1 reg2))
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(defun ISN-SUB (vm reg1 reg2) (ISN--OP- vm #'- reg1 reg2))
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(defun ISN-MULT (vm reg1 reg2) (ISN--OP- vm #'* reg1 reg2))
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(defun ISN-DIV (vm reg1 reg2) (ISN--OP- vm #'/ reg1 reg2))
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(defun ISN-INCR (vm register)
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(set-register vm register (+ (get-register vm register) 1)))
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(defun ISN-DECR (vm register)
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(set-register vm register (- (get-register vm register) 1)))
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(defun ISN-PUSH (vm register)
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(ISN-INCR vm 'SP)
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(ISN-STORE vm register (get-register vm 'SP)))
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(defun ISN-POP (vm register)
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(ISN-LOAD vm (get-register vm 'SP) register)
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(ISN-DECR vm 'SP))
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(defun ISN-JMP (vm dst)
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(set-register vm 'PC (- dst 1)))
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(defun ISN-JSR (vm dst)
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(ISN-PUSH vm 'PC)
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(ISN-JMP vm dst))
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(defun ISN-RTN (vm)
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(ISN-POP vm 'PC))
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(defun ISN-CMP (vm reg1 reg2)
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(set-register vm 'EQ (= (get-register vm reg1) (get-register vm reg2)))
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(set-register vm 'PP (< (get-register vm reg1) (get-register vm reg2)))
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(set-register vm 'PG (> (get-register vm reg1) (get-register vm reg2))))
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(defun ISN--JCOND- (pp eq pg vm dst)
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(if (or (and eq (get-register vm 'EQ))
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(and pg (get-register vm 'PG))
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(and pp (get-register vm 'PP)))
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(ISN-JMP vm dst)))
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(defun ISN-JEQ (vm dst)
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(ISN--JCOND- nil t nil vm dst))
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(defun ISN-JPG (vm dst)
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(ISN--JCOND- nil nil t vm dst))
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(defun ISN-JPP (vm dst)
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(ISN--JCOND- t nil nil vm dst))
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(defun ISN-JPE (vm dst)
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(ISN--JCOND- t t nil vm dst))
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(defun ISN-JGE (vm dst)
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(ISN--JCOND- nil t t vm dst))
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(defun ISN-JNE (vm dst)
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(ISN--JCOND- t nil t vm dst))
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(defun ISN-NOP (vm)
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vm)
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(defun ISN-HALT (vm)
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(set-register vm 'HALT t))
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;;Test Unitaire
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;; TODO : Faire deftestvar
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;; TODO : Finir le test unitaire
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(load "test-unitaire")
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(erase-tests virtual-machine)
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(deftestvar virtual-machine t-r0-value (+ 1 (random 42))) ;; r0 > 0 pour la division.
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(deftestvar virtual-machine t-r1-value (random 42))
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(deftestvar virtual-machine t-m-value (random 42))
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(deftestvar virtual-machine t-vm-size (+ 10 (random 10)))
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(deftestvar virtual-machine t-adress (random t-vm-size))
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(deftestvar virtual-machine vm
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(progn
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(make-vm t-vm-size)
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(set-register vm 'R0 t-r0-value)
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(set-memory vm t-adress t-m-value)))
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(deftest virtual-machine
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(progn (ISN-LOAD vm t-address 'R0)
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(get-register vm 'R0))
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t-m-value)
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(deftest virtual-machine
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(progn (ISN-STORE vm 'R0 t-address)
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(get-memory vm t-address))
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t-r0-value)
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(deftest virtual-machine
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(progn (ISN-MOVE vm 'R0 'R1)
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(get-register vm 'R1))
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t-r0-value)
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(deftest virtual-machine
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(progn (ISN-ADD vm 'R0 'R1)
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(get-register vm 'R1))
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(+ t-r1-value t-r0-value))
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(deftest virtual-machine
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(progn (ISN-SUB vm 'R0 'R1)
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(get-register vm 'R1))
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(- t-r1-value t-r0-value))
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(deftest virtual-machine
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(progn
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;; Multiplication par un petit nombre (on ne
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;; gère pas d'éventuels overflows pour l'instant).
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(set-register vm 'R0 2)
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(ISN-MULT vm 'R0 'R1)
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(get-register vm 'R1))
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(* 2 t-r0-value))
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(deftest virtual-machine
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(progn (ISN-DIV vm 'R0 'R1) ;; R0 > 0 (voir t-r0-value ci-dessus).
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(get-register vm 'R1))
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(/ t-r1-value t-r0-value))
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(deftest virtual-machine
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(progn (ISN-INCR vm 'R1)
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(get-register vm 'R1))
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(+ t-r1-value 1))
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(deftest virtual-machine
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(progn (ISN-DECR vm 'R0) ;; R0 > 0 (on ne gère pas les négatifs)
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(get-register vm 'R0))
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(- t-r0-value 1))
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(deftest virtual-machine
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(progn (ISN-PUSH vm 'R1)
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(get-memory vm (get-register vm 'SP)))
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(t-r1-value))
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