"Load story file into memory."
(with-temp-buffer
(insert-file-contents-literally filename)
- (setq ez-memory (encode-coding-string (buffer-string) 'raw-text))))
+ (setq ez-memory (encode-coding-string (buffer-string) 'raw-text)))
+ 'done)
;; Global variables
(defun ez-get-global-var (gvar)
- (ez-mem-ref-word (+ (* 2 gvar) (ez-mem-ref-word ez-globalvartab-addr))))
+ (ez-mem-ref-word (+ (* 2 gvar) ez-globalvartab-addr)))
(defun ez-set-global-var (gvar val)
- (ez-mem-set-word (+ (* 2 gvar) (ez-mem-ref-word ez-globalvartab-addr)) val))
+ (ez-mem-set-word (+ (* 2 gvar) ez-globalvartab-addr) val))
;; Object tree
(ez-get-zstring (+ 1 plist-addr))
nil)))))
+(defun ez-get-prop-default (prop)
+ (ez-mem-ref-word (+ ez-objtab-addr (* 2 (+ 1 prop)))))
+
+(defun ez-get-prop-len (prop-size-byte)
+ (lsh prop-size-byte -5))
+
+(defun ez-get-prop-num (prop-size-byte)
+ (logand #b00011111 prop-size-byte))
+
+(defun ez-get-obj-prop-addr (obj prop)
+ (let* ((plist-addr (ez-get-obj-plist-addr obj))
+ (prop-addr (+ plist-addr 1 (* 2 (ez-mem-ref-byte plist-addr))))
+ (size-byte (ez-mem-ref-byte prop-addr)))
+ (while (not (or (= size-byte 0)
+ (= prop (ez-get-prop-num size-byte))))
+ (setq prop-addr (+ prop-addr (ez-get-prop-len size-byte) 2)
+ size-byte (ez-mem-ref-byte prop-addr)))
+ prop-addr))
+
+(defun ez-get-obj-prop (obj prop)
+ (let* ((prop-addr (ez-get-obj-prop-addr obj prop))
+ (size-byte (ez-mem-ref-byte prop-addr)))
+ (if (= size-byte 0)
+ (ez-get-prop-default prop)
+ (let ((prop-len (ez-get-prop-len size-byte))
+ (data-addr (+ prop-addr 1)))
+ (cond
+ ((= prop-len 0)
+ (ez-mem-ref-byte data-addr))
+ ((>= prop-len 1)
+ (ez-mem-ref-word data-addr)))))))
+
+(defun ez-set-obj-prop (obj prop value)
+ (let* ((prop-addr (ez-get-obj-prop-addr obj prop))
+ (size-byte (ez-mem-ref-byte prop-addr)))
+ (cond
+ ((= size-byte 0)
+ (error "Tried to set non-existant property"))
+ ((= (ez-get-prop-len size-byte) 1)
+ (ez-mem-set-byte (+ prop-addr 1) value))
+ (t
+ (ez-mem-set-word (+ prop-addr 1) value)))))
+
+(defun ez-get-obj-attr (obj attr)
+ (let* ((byte-num (/ attr 8))
+ (bit-num (mod attr 8))
+ (bit-mask (lsh 1 (- 7 bit-num))))
+ (if (> (logand bit-mask (ez-mem-ref-byte (+ (ez-get-obj-addr obj) byte-num))) 0)
+ 1
+ 0)))
+
+(defun ez-set-obj-attr (obj attr val)
+ (let* ((byte-num (/ attr 8))
+ (bit-num (mod attr 8))
+ (bit-mask (lsh 1 (- 7 bit-num)))
+ (byte-addr (+ (ez-get-obj-addr obj) byte-num))
+ (byte (ez-mem-ref-byte byte-addr))
+ (current-set (> (logand bit-mask byte) 0)))
+ (if (or (and current-set (= val 0))
+ (and (not current-set) (> val 0)))
+ (ez-mem-set-byte byte-addr (logxor byte bit-mask)))))
;; Z-strings
operand-types '(w)))
((<= #xB0 opbyte #xBF)
(setq optype '0op
- opcode (- opbyte #xb0)))
+ opcode (- opbyte #xb0)
+ operands '()
+ operand-types '()))
((<= #xC0 opbyte #xDF)
- (error "Unsupported op" opbyte))
+ (error "Unsupported op %x" opbyte))
((<= #xE0 opbyte #xFF)
(setq optype 'var
opcode (- opbyte #xe0))
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))
+ (error "Unsupported op PC:%x Optype:%s Opcode:%x Operands:%s Operand-types:%s"
+ 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))
+ (message "PC:%x Optype:%s Opcode:%x Mnemonic:%s Operands:%s Operand-types:%s"
+ instr-pc optype opcode mnemonic operands operand-types))
(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
(let ((type4 (logand #b11)))
(if (= type4 #b11)
nil
- (list type4)))))))))))))
- (operands nil))
+ (list type4))))))))))))))
(cons
(mapcar
(lambda (type)
(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)))
+ (single-byte (> (logand branch-byte #b01000000) 0))
(offset
(if single-byte
(logand branch-byte #b00111111)
(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))))))
+ (if (or (and branch (not invert))
+ (and (not branch) invert))
+ (cond
+ ((= offset 0)
+ (ez-op-rfalse))
+ ((= offset 1)
+ (ez-op-rtrue))
+ (t
+ (ez-set-pc (+ (ez-get-pc) offset -2)))))))
;; Operations
((2op #x0D) store ez-op-store)
((1op #x0E) load ez-op-load)
((var #x01) storew ez-op-storew)
+ ((2op #x0F) loadw ez-op-loadw)
((2op #x01) je ez-op-je)
((2op #x08) or ez-op-or)
((2op #x09) and ez-op-and)
((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)))
+ ((var #x00) call_fv ez-op-callf)
+ ((1op #x01) get_sibling ez-op-get-sibling)
+ ((1op #x02) get_child ez-op-get-child)
+ ((1op #x03) get_parent ez-op-get-parent)
+ ((2op #x0A) test_attr ez-op-test-attr)
+ ((var #x03) put_prop ez-op-put-prop)))
(defun ez-op-ret (operands &optional operand-types)
(let ((retval (car operands)))
t)
(defun ez-op-rtrue (&optional operands operand-types)
- (ez-op-ret (list 1)))
+ (ez-op-ret (list 1))
+ t)
(defun ez-op-rfalse (&optional operands operand-types)
- (ez-op-ret (list 0)))
+ (ez-op-ret (list 0))
+ t)
(defun ez-op-jz (operands operand-types)
(ez-do-branch (= (car operands) 0))
(ez-mem-set-word (+ baddr (* 2 n)) a))
t)
+(defun ez-op-loadw (operands operand-types)
+ (let ((baddr (car operands))
+ (n (cadr operands)))
+ (ez-set-var (ez-read-pc-byte-and-inc) (ez-mem-ref-word (+ baddr (* 2 n)))))
+ t)
+
(defun ez-op-and (operands operand-types)
(let ((a (car operands))
(b (cadr operands)))
(ez-set-local-var (+ i 1) (ez-mem-ref-word (+ r 1 (* 2 i)))))))
t)
+(defun ez-op-test-attr (operands operand-types)
+ (let ((obj (car operands))
+ (attr (cadr operands)))
+ (ez-do-branch (= 1 (ez-get-obj-attr obj attr)))
+ t))
+
+(defun ez-op-get-sibling (operands operand-types)
+ (let ((sib (ez-get-obj-sibling (car operands))))
+ (ez-set-var (ez-read-pc-byte-and-inc) sib)
+ (ez-do-branch (> sib 0))
+ t))
+
+(defun ez-op-get-child (operands operand-types)
+ (let ((child (ez-get-obj-child (car operands))))
+ (ez-set-var (ez-read-pc-byte-and-inc) child)
+ (ez-do-branch (> child 0))
+ t))
+
+(defun ez-op-get-parent (operands operand-types)
+ (let ((parent (ez-get-obj-parent (car operands))))
+ (ez-set-var (ez-read-pc-byte-and-inc) parent)
+ (ez-do-branch (> parent 0))
+ t))
+
+(defun ez-op-put-prop (operands operand-types)
+ (let* ((obj (car operands))
+ (prop (cadr operands))
+ (a (caddr operands)))
+ (ez-set-obj-prop obj prop a)
+ t))
+
;; Main
(defun ez-run (filename)
(ez-parse-header)
(setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
- (while (ez-execute-inst)))
+ (while (ez-execute-instr)))
;; Scratch
-(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-load-file "zork1.z3")
+;; (ez-parse-header)
+;; (setq ez-call-stack (list (ez-make-call-stack-frame ez-start-pc)))
+;; (while (ez-execute-instr))
+(ez-run "zork1.z3")
;;; ez.el ends here
The Lambda Lab / projects / ez.git / blobdiff