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|
(in-package "ACL2")
(include-book "jvm-model")
(include-book "consistent-state")
;----------------------------------------------------------------------
;
; defensive-JVM
;
;----------------------------------------------------------------------
(defun djvm-check-IFEQ (inst st)
(let* ((target (arg inst))
(pc (get-pc st)))
(and (consistent-state st)
(consp (op-stack st))
(pc-in-range (set-pc (+ 1 pc) st))
(pc-in-range (set-pc target st)))))
(defun djvm-execute-IFEQ (inst st)
(let* ((target (arg inst))
(v (topstack st))
(pc (get-pc st)))
(if (equal v 0)
(set-pc target
(popStack st))
(set-pc (+ 1 pc)
(popStack st)))))
;----------------------------------------------------------------------
(defun djvm-check-PUSH (inst st)
(declare (ignore inst))
(let* ((pc (get-pc st)))
(and (consistent-state st)
(<= (+ 1 (len (op-stack st)))
(g 'max-stack (topx (g 'call-stack st))))
(pc-in-range (set-pc (+ 1 pc) st)))))
(defun djvm-execute-PUSH (inst st)
(let* ((v (arg inst))
(pc (get-pc st)))
(set-pc (+ 1 pc)
(pushStack v st))))
;----------------------------------------------------------------------
(defun djvm-check-INVOKE (inst st)
(let* ((method-name (arg inst))
(method-table (g 'method-table st))
(method (binding method-name method-table))
(nargs (g 'nargs method)))
(and (consistent-state st)
(bound? method-name method-table)
(<= 0 (g 'max-stack (binding method-name method-table)))
(integerp nargs)
(<= 0 nargs)
(<= nargs (len (op-stack st)))
(<= (+ 1 (- (len (op-stack st))
nargs))
(g 'max-stack (topx (g 'call-stack st))))
(pc-in-range (set-pc (+ 1 (get-pc st))
st)))))
;; this however does not guarantee that executing djvm-check will preserve
;; consistent-state
;;
;; because in the consistent-state we require that
;;
;; ;; the following two need to has to be true!!! In the new BCV, we can
;; ;; calculate the signiture at the each PC location!!
;; ;;
;; (bound? pc (get-sig-vector caller method-table))
;; (sig-frame-compatible
;; (sig-frame-push-value (g 'ret callee) sig-frame)
;; record-frame-sig))))
;;
;; However if we don't require this, we will have no way to show that BCV is
;; correct.
;;
;; We know this is true, although djvm-check-INVOKE does not explicitly check
;; it!!
;; .....
;;; Sun Nov 20 19:23:33 2005, we update consistent-state that assert bcv-method
;;; instead of bcv-simple-method!!!
;;;
(defun djvm-execute-INVOKE (inst st)
(let* ((method-name (arg inst))
(method-table (g 'method-table st))
(method (binding method-name method-table))
(nargs (g 'nargs method)))
(pushInitFrame
method-name ;; Thu Nov 3 21:44:09 2005. note.
;; what if the method-table is not well formed,
;; binding method-name does not give a method of the correct name?
(init-locals (op-stack st) nargs)
(set-pc (+ 1 (get-pc st))
;;
;; we could avoid modifying the pc
;; and make the return instruction to modify the pc of caller
;; however we still face the problem that
;; the caller's operand stack does not comply with the signature
;;
(popStack-n st nargs)))))
;----------------------------------------------------------------------
(defun djvm-check-HALT (inst st)
(declare (ignore inst))
(consistent-state st))
(defun djvm-execute-HALT (inst st)
(declare (ignore inst))
st)
;----------------------------------------------------------------------
(defun djvm-check-POP (inst st)
(declare (ignore inst))
(and (consistent-state st)
(consp (op-stack st))
(pc-in-range (set-pc (+ 1 (get-pc st))
st))))
(defun djvm-execute-POP (inst st)
(declare (ignore inst))
(set-pc (+ 1 (get-pc st))
(popStack st)))
;----------------------------------------------------------------------
(defun djvm-check-RETURN (inst st)
(declare (ignore inst))
(and (consistent-state st)
(or (not (consp (popx (g 'call-stack st))))
(and (consp (op-stack st))
(<= (+ 1 (len (g 'op-stack (topx (popx (g 'call-stack st))))))
(g 'max-stack (topx (popx (g 'call-stack st)))))))))
(defun djvm-execute-RETURN (inst st)
(declare (ignore inst))
;; update it to halt, when we know this is the very first frame!! or update
;; our consistent-state predicate!
(if (not (consp (popx (g 'call-stack st))))
st
(pushStack
(topStack st)
(s 'call-stack
(popx (g 'call-stack st))
st))))
;----------------------------------------------------------------------
;----------------------------------------------------------------------
(defun djvm-check-step-g (inst st)
(let* ((opcode (op-code inst)))
(cond ((equal opcode 'INVOKE)
(djvm-check-INVOKE inst st))
((equal opcode 'PUSH)
(djvm-check-PUSH inst st))
((equal opcode 'IFEQ)
(djvm-check-IFEQ inst st))
((equal opcode 'HALT)
(djvm-check-HALT inst st))
((equal opcode 'POP)
(djvm-check-POP inst st))
((equal opcode 'RETURN)
(djvm-check-RETURN inst st))
(t nil))))
(defun djvm-check-step (st)
(let* ((inst (next-inst st))
(opcode (op-code inst)))
(cond ((equal opcode 'INVOKE)
(djvm-check-INVOKE inst st))
((equal opcode 'PUSH)
(djvm-check-PUSH inst st))
((equal opcode 'IFEQ)
(djvm-check-IFEQ inst st))
((equal opcode 'HALT)
(djvm-check-HALT inst st))
((equal opcode 'POP)
(djvm-check-POP inst st))
((equal opcode 'RETURN)
(djvm-check-RETURN inst st))
(t nil))))
(defun djvm-step (st)
(if (not (djvm-check-step st))
st
(let* ((inst (next-inst st))
(opcode (op-code inst)))
(cond ((equal opcode 'INVOKE)
(djvm-execute-INVOKE inst st))
((equal opcode 'PUSH)
(djvm-execute-PUSH inst st))
((equal opcode 'IFEQ)
(djvm-execute-IFEQ inst st))
((equal opcode 'HALT)
(djvm-execute-HALT inst st))
((equal opcode 'POP)
(djvm-execute-POP inst st))
((equal opcode 'RETURN)
(djvm-execute-RETURN inst st))
(t st)))))
;----------------------------------------------------------------------
(defun djvm-run (st n)
(if (zp n) st
(djvm-run (djvm-step st) (- n 1))))
;----------------------------------------------------------------------
;;
;; testing.
;;
|
