;;; Code:
-;; Character set tables
+;; Utility functions
+
+(defun ez-decode-signed-bits (n nbits)
+ (if (= 0 (lsh n (- 1 nbits)))
+ n
+ (- n (lsh 1 nbits))))
+
+(defun ez-decode-signed-byte (b)
+ (ez-decode-signed-bits b 8))
+
+(defun ez-decode-signed-word (w)
+ (ez-decode-signed-bits w 16))
+
+(defun binformat (n &optional s)
+ (unless s
+ (setq s ""))
+ (let ((d (/ n 2))
+ (new-s (concat (number-to-string (mod n 2)) s)))
+ (if (= d 0)
+ new-s
+ (binformat d new-s))))
;; Memory
;; Object tree
-(defun ez-make-obj (&optional name attribs props parent first-child next-sibling)
- (list name attribs props parent first-child next-sibling))
-
-(defun ez-obj-name (obj) (elt obj 0))
-(defun ez-obj-attribs (obj) (elt obj 1))
-(defun ez-obj-props (obj) (elt obj 2))
-(defun ez-obj-parent (obj) (elt obj 3))
-(defun ez-obj-first-child (obj) (elt obj 4))
-(defun ez-obj-next-sibling (obj) (elt obj 5))
-
(defvar ez-property-defaults nil)
(defun ez-load-property-defaults ()
(dotimes (i 31)
(aset ez-property-defaults i (aref ez-memory (+ ez-objtab-addr (* 2 i))))))
+(defun ez-get-obj-addr (obj-id)
+ (+ ez-objtab-addr (* 2 31) (* 9 (- obj-id 1))))
+
+(defun ez-get-obj-parent (obj-id)
+ (let ((addr (ez-get-obj-addr obj-id)))
+ (ez-mem-ref-byte (+ addr 4))))
+
+(defun ez-get-obj-sibling (obj-id)
+ (let ((addr (ez-get-obj-addr obj-id)))
+ (ez-mem-ref-byte (+ addr 5))))
+
+(defun ez-get-obj-child (obj-id)
+ (let ((addr (ez-get-obj-addr obj-id)))
+ (ez-mem-ref-byte (+ addr 6))))
+
+(defun ez-get-obj-plist-addr (obj-id)
+ (let ((addr (ez-get-obj-addr obj-id)))
+ (ez-mem-ref-word (+ addr 7))))
+
+(defun ez-get-obj-name (obj-id)
+ (let ((plist-addr (ez-get-obj-plist-addr obj-id)))
+ (if (> (ez-mem-ref-byte plist-addr) 0)
+ (ez-get-zstring (+ 1 (ez-get-obj-plist-addr obj-id)))
+ nil)))
+
(defun ez-get-obj (obj-id)
(let ((addr (+ ez-objtab-addr
(* 2 31)
(let ((plist-addr (ez-mem-ref-word (+ addr 7))))
(if (> (ez-mem-ref-byte plist-addr) 0)
(ez-get-zstring (+ 1 plist-addr))
- "")))))
+ nil)))))
;; Z-strings
((memq char '(1 2 3)) ;Abbreviation
(setq abbrev-char char))
((= char 4)
- (setq cur (mod (+ cur 1) 2)))
+ (setq cur (mod (+ cur 1) 3)))
((= char 5)
- (setq cur (mod (+ 2 (- cur 1)) 2)))
+ (setq cur (mod (+ 3 (- cur 1)) 3)))
(t
(setq s (concat s (substring (elt ez-zstring-alphabets cur)
char (+ char 1))))
(defun ez-increment-pc (inc)
(ez-set-pc (+ (ez-get-pc) inc)))
+(defun ez-read-pc-byte-and-inc ()
+ (let ((res (ez-mem-ref-byte (ez-get-pc))))
+ (ez-increment-pc 1)
+ res))
+
+(defun ez-read-pc-word-and-inc ()
+ (let ((res (ez-mem-ref-word (ez-get-pc))))
+ (ez-increment-pc 2)
+ res))
;; Instruction execution
((= var 0)
(ez-routine-stack-pop))
((< var 16)
- (ez-get-local-var (- var 1)))
+ (ez-get-local-var var))
(t
(ez-get-global-var (- var 16)))))
((= var 0)
(ez-routine-stack-push val))
((< var 16)
- (ez-set-local-var (- var 1) val))
+ (ez-set-local-var var val))
(t
(ez-set-global-var (- var 16) val))))
+(defun ez-read-pc-var-and-inc ()
+ (ez-get-var (ez-read-pc-byte-and-inc)))
+
(defun ez-execute-instr ()
- (let ((op-byte (ez-mem-ref-byte (ez-get-pc))))
- (ez-inc-pc 1)
+ (let ((instr-pc (ez-get-pc))
+ (opbyte (ez-read-pc-byte-and-inc))
+ (optype)
+ (opcode nil)
+ (operands))
(cond
- ((<= #x0 op-byte #x1f) (list '2op op-byte 'b 'b))
- ((<= #x20 op-byte #x3F) (list '2op (- op-byte #x20) 'b 'v))
- ((<= #x40 op-byte #x5F) (list '2op (- op-byte #x40) 'v 'b))
- ((<= #x60 op-byte #x7F) (list '2op (- op-byte #x60) 'v 'v))
- ((<= #x80 op-byte #x8F) (list '1op (- op-byte #x80) 'w))
- ((<= #x90 op-byte #x9F) (list '1op (- op-byte #x90) 'b))
- ((<= #xA0 op-byte #xAF) (list '1op (- op-byte #xa0) 'v))
- ((<= #xB0 op-byte #xBF) (list '0op (- op-byte #xb0)))
- ((<= #xC0 op-byte #xDF) (list '2op (- op-byte #xc0) 'var-instr-format))
- ((<= #xE0 op-byte #xFF) (list 'var (- op-byte #xe0))
- (let ((opcode (- op-byte #xe0))
- (types (ez-mem-ref-byte (ez-get-pc))))
- ))
- )))
-
-(ez-get-instr ez-start-pc)
-(ez-mem-ref-byte ez-start-pc)
-
-(binformat #xe0)
-(binformat #x03)
-
+ ((<= #x0 opbyte #x1f)
+ (setq optype '2op
+ opcode opbyte
+ operands (list (ez-read-pc-byte-and-inc)
+ (ez-read-pc-byte-and-inc))
+ operand-types '(b b)))
+ ((<= #x20 opbyte #x3F)
+ (setq optype '2op
+ opcode (- opbyte #x20)
+ operands (list (ez-read-pc-byte-and-inc)
+ (ez-read-pc-var-and-inc))
+ operand-types '(b w)))
+ ((<= #x40 opbyte #x5F)
+ (setq optype '2op
+ opcode (- opbyte #x40)
+ operands (list (ez-read-pc-var-and-inc)
+ (ez-read-pc-byte-and-inc))
+ operand-types '(w b)))
+ ((<= #x60 opbyte #x7F)
+ (setq optype '2op
+ opcode (- opbyte #x60)
+ operands (list (ez-read-pc-var-and-inc)
+ (ez-read-pc-var-and-inc))
+ operand-types '(w w)))
+ ((<= #x80 opbyte #x8F)
+ (setq optype '1op
+ opcode (- opbyte #x80)
+ operands (list (ez-read-pc-word-and-inc))
+ operand-types '(w)))
+ ((<= #x90 opbyte #x9F)
+ (setq optype '1op
+ opcode (- opbyte #x90)
+ operands (list (ez-read-pc-byte-and-inc))
+ operand-types '(b)))
+ ((<= #xA0 opbyte #xAF)
+ (setq optype '1op
+ opcode (- opbyte #xa0)
+ operands (list (ez-read-pc-var-and-inc))
+ operand-types '(w)))
+ ((<= #xB0 opbyte #xBF)
+ (setq optype '0op
+ opcode (- opbyte #xb0)))
+ ((<= #xC0 opbyte #xDF)
+ (error "Unsupported op" opbyte))
+ ((<= #xE0 opbyte #xFF)
+ (setq optype 'var
+ opcode (- opbyte #xe0))
+ (let ((operands-and-types (ez-read-var-operands-and-inc)))
+ (setq operands (car operands-and-types)
+ operand-types (cdr operands-and-types)))))
+ (let ((table-row (assoc (list optype opcode) ez-op-table)))
+ (unless table-row
+ (error "Unsupported op" instr-pc optype opcode operands operand-types))
+ (let ((mnemonic (elt table-row 1)))
+ (message "PC:%x Optype:%s Opcode:%x Mnemonic:%s Operands:%s"
+ instr-pc optype opcode mnemonic operands))
+ (funcall (elt table-row 2) operands operand-types))))
+
+(defun ez-read-var-operands-and-inc ()
+ (let* ((type-byte (ez-read-pc-byte-and-inc))
+ (bleh (message (binformat type-byte)))
+ (types (let ((type1 (lsh type-byte -6)))
+ (if (= type1 #b11)
+ nil
+ (cons type1
+ (let ((type2 (lsh (logand #b110000 type-byte) -4)))
+ (if (= type2 #b11)
+ nil
+ (cons type2
+ (let ((type3 (lsh (logand #b1100 type-byte) -2)))
+ (if (= type3 #b11)
+ nil
+ (cons type3
+ (let ((type4 (logand #b11)))
+ (if (= type4 #b11)
+ nil
+ (list type4)))))))))))))
+ (operands nil))
+ (cons
+ (mapcar
+ (lambda (type)
+ (cond
+ ((= type 0) (ez-read-pc-word-and-inc))
+ ((= type 1) (ez-read-pc-byte-and-inc))
+ ((= type 2) (ez-read-pc-var-and-inc))))
+ types)
+ (mapcar
+ (lambda (type)
+ (if (= type 1)
+ 'b
+ 'w))
+ types))))
+
+;; Branches
+
+(defun ez-do-branch (branch)
+ (let* ((branch-byte (ez-read-pc-byte-and-inc))
+ (invert (= 0 (logand branch-byte #b10000000)))
+ (single-byte (= 1 (logand branch-byte #b01000000)))
+ (offset
+ (if single-byte
+ (logand branch-byte #b00111111)
+ (let ((pos (= (logand branch-byte #b00100000) 0))
+ (val (+ (* 256 (logand branch-byte #b00011111))
+ (ez-read-pc-byte-and-inc))))
+ (if pos
+ val
+ (- val 8192))))))
+ (cond
+ ((= offset 0)
+ (ez-op-rfalse))
+ ((= offset 1)
+ (ez-op-rtrue))
+ (t
+ (ez-set-pc (+ (ez-get-pc) offset -2))))))
+
+;; Operations
+
+(defvar ez-op-table
+ '(((0op #x00) rtrue ez-op-rtrue)
+ ((0op #x01) rfalse ez-op-rfalse)
+ ((1op #x00) jz ez-op-jz)
+ ((1op #x0B) ret ez-op-ret)
+ ((1op #x0C) jump ez-op-jump)
+ ((2op #x0D) store ez-op-store)
+ ((1op #x0E) load ez-op-load)
+ ((var #x01) storew ez-op-storew)
+ ((2op #x01) je ez-op-je)
+ ((2op #x08) or ez-op-or)
+ ((2op #x09) and ez-op-and)
+ ((2op #x14) add ez-op-add)
+ ((2op #x15) sub ez-op-sub)
+ ((2op #x16) mul ez-op-mul)
+ ((2op #x17) div ez-op-div)
+ ((2op #x18) mod ez-op-mod)
+ ((var #x00) call_fv ez-op-callf)))
+
+(defun ez-op-ret (operands &optional operand-types)
+ (let ((retval (car operands)))
+ (ez-pop-call-stack-frame)
+ (ez-set-var (ez-read-pc-byte-and-inc) retval))
+ t)
+
+(defun ez-op-rtrue (&optional operands operand-types)
+ (ez-op-ret (list 1)))
+
+(defun ez-op-rfalse (&optional operands operand-types)
+ (ez-op-ret (list 0)))
+
+(defun ez-op-jz (operands operand-types)
+ (ez-do-branch (= (car operands) 0))
+ t)
+
+(defun ez-op-je (operands operand-types)
+ (ez-do-branch (memq (car operands) (cdr operands)))
+ t)
+
+(defun ez-op-jump (operands operand-types)
+ (let ((offset (if (eq (car operand-types) 'b)
+ (ez-decode-signed-byte (car operands))
+ (ez-decode-signed-word (car operands)))))
+ (ez-set-pc (+ (ez-get-pc) offset -2)))
+ t)
+
+(defun ez-op-store (operands operand-types)
+ (let ((var (car operands))
+ (a (cadr operands)))
+ (ez-set-var var a))
+ t)
+
+(defun ez-op-load (operands operand-types)
+ (let ((var (car operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (ez-get-var var)))
+ t)
+
+(defun ez-op-storew (operands operand-types)
+ (let ((baddr (car operands))
+ (n (cadr operands))
+ (a (caddr operands)))
+ (ez-mem-set-word (+ baddr (* 2 n)) a))
+ t)
+
+(defun ez-op-and (operands operand-types)
+ (let ((a (car operands))
+ (b (cadr operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (logand a b)))
+ t)
+
+(defun ez-op-or (operands operand-types)
+ (let ((a (car operands))
+ (b (cadr operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (logior a b)))
+ t)
+
+(defun ez-op-add (operands operand-types)
+ (let ((a (car operands))
+ (b (cadr operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (mod (+ a b) #x10000)))
+ t)
+
+(defun ez-op-sub (operands operand-types)
+ (let ((a (car operands))
+ (b (cadr operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (mod (+ (- a b) #x10000) #x10000)))
+ t)
+
+(defun ez-op-mul (a b)
+ (let ((a (car operands))
+ (b (cadr operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (mod (* a b) #x10000)))
+ t)
+
+(defun ez-op-div (a b)
+ (error "Not implemented"))
+
+(defun ez-op-mod (a b)
+ (error "Not implemented"))
+
+(defun ez-op-callf (operands operand-types)
+ (let* ((raddr (car operands))
+ (call-operands (cdr operands))
+ (r (* 2 raddr))
+ (L (ez-mem-ref-byte r))
+ (n (length call-operands))
+ (new-pc (+ r 1 (* L 2))))
+ (ez-add-call-stack-frame new-pc)
+ (dotimes (i L)
+ (if (< i n)
+ (ez-set-local-var (+ i 1) (elt call-operands i))
+ (ez-set-local-var (+ i 1) (ez-mem-ref-word (+ r 1 (* 2 i)))))))
+ t)
;; Main
(ez-load-file "zork1.z3")
(ez-parse-header)
(setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
+(ez-execute-instr)
+
+(while (ez-execute-instr))
+
+(binformat #x97)
+"10010111"
+(ez-get-obj 208)
+(binformat #x57)
+"01010111"
+
+
+
+ez-call-stack
+((28281 nil [33807 0 180 47872 0 0 0 0 0 0 0 0 ...] nil) (22022 nil [33807 65535 0 0 0 0 0 0 0 0 0 0 ...] nil) (20715 nil [0 0 0 0 0 0 0 0 0 0 0 0 ...] nil))
+
+((22049 nil [33807 0 180 47872 0 0 0 0 0 0 0 0 ...] nil) (22022 nil [33807 65535 0 0 0 0 0 0 0 0 0 0 ...] nil) (20715 nil [0 0 0 0 0 0 0 0 0 0 0 0 ...] nil))
+
+
+
+
+
+
-(ez-get-obj 1)
-(defun binformat (n &optional s)
- (unless s
- (setq s ""))
- (let ((d (/ n 2))
- (new-s (concat (number-to-string (mod n 2)) s)))
- (if (= d 0)
- new-s
- (binformat d new-s))))
-(binformat (ez-mem-ref-byte ez-start-pc))
-"11100000"
;;; ez.el ends here
The Lambda Lab / projects / ez.git / blobdiff