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fvm.scm
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fvm.scm
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; (_jif then else test)
; (_jpair then else ob)
; (_jtype_x then else ob)
; (_bind_
;
; (jtrue T E False) -> E
; (jtrue T E _) -> (T _)
; (jbtype-sn T E #[s v1 .. vn]) -> (T v1 .. vn)
; (jbtype-sn T E _) -> (E _)
; (jt-t T E O) -> (T O) | (E O)
;
; object types
; 0 = call, 1 = pair, 2 = symbol
;
(define (op-input node)
(let*
((fd (cdr node))
(char (read-char fd)))
(set-car! node op-i)
(if (eof-object? char)
(begin
(set-cdr! node (list))
(exit 0))
(set-cdr! node
(vector 1
(char->integer char)
(cons op-input fd))))
(cdr node)))
(define (print . args)
(for-each display args)
(newline))
(define-syntax update-cdr!
(syntax-rules ()
((update-cdr! obj val)
(set-cdr! obj (evaluate val)))))
(define (evaluate node)
(if (pair? node)
(if (procedure? (car node))
((car node) node)
(let ((a (evaluate (car node))))
(set-car! node a)
(a node)))
node))
; return an evaluated value
(define (op-ret node) (cdr node))
(define (op-ix node)
(let ((val (cdr node)))
(if (pair? val)
(begin
(update-cdr! node (evaluate val))
(set-car! node op-ret)
(cdr node)
;(evaluate val)
)
(begin
(set-car! node op-ret)
val))))
(define (op-i an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(set-car! an op-ret)
(cdr an))
(define (op-y node)
(set-car! node (evaluate (cdr node)))
(set-cdr! node node)
((car node) node))
;(define (op-y node)
; (let ((x (cdr node)))
; (if (pair? x)
; (set-car! node (evaluate x))
; (set-car! node x))
; ;(set-cdr! node (cons op-y x))
; (set-cdr! node node)
; (evaluate node)))
; ;(set-car! (cdr node))
; ;(set-cdr! node node)
; (C a b c) = pass left only = ((a c) b)
; (B a b c) = pass right only = (a (b c))
(define (op-s an)
(lambda (bn)
(if (pair? (cdr an)) (set-cdr! an (evaluate (cdr an))))
(if (pair? (cdr bn)) (set-cdr! bn (evaluate (cdr bn))))
(lambda (cn)
(let*
((a (cdr an))
(b (cdr bn))
(c (cdr cn))
(new-a (cons a c)))
(set-car! cn new-a)
(set-cdr! cn (cons b c))
; (evaluate cn)
((a new-a) cn)
))))
; (S2 a b c d) = ((a (b d)) (c d))
(define (op-s2 an)
(lambda (bn)
(lambda (cn)
(lambda (dn)
(if (pair? (cdr an)) (set-cdr! an (evaluate (cdr an))))
(let*
((a (cdr an))
(b (cdr bn))
(c (cdr cn))
(d (cdr dn))
(anew (cons a (cons b d))))
(set-car! dn anew)
(set-cdr! dn (cons c d))
;(evaluate dn)
((a anew) dn)
)))))
; (C2 a b c d) = ((a (b d)) c)
(define (op-c2 an)
(lambda (bn)
(lambda (cn)
(lambda (dn)
(if (pair? (cdr an)) (set-cdr! an (evaluate (cdr an))))
(let*
((a (cdr an))
(b (cdr bn))
(c (cdr cn))
(d (cdr dn))
(anew (cons a (cons b d))))
;(set-car! dn (cons a (cons b d)))
;(set-cdr! dn c)
(set-car! dn anew)
(set-cdr! dn c)
;(evaluate dn)
((a anew) dn)
)))))
; (B2 a b c d) = ((a b) (c d))
(define (op-b2 an)
(lambda (bn)
(lambda (cn)
(lambda (dn)
(if (pair? (cdr an)) (set-cdr! an (evaluate (cdr an))))
(let
((a (cdr an))
(b (cdr bn))
(c (cdr cn))
(d (cdr dn)))
(set-car! dn a)
(set-cdr! dn (cons b (cons c d)))
(a dn)
)))))
(define (op-c an)
(lambda (bn)
(lambda (cn)
(if (pair? (cdr an)) (set-cdr! an (evaluate (cdr an))))
(let*
((a (cdr an))
(b (cdr bn))
(c (cdr cn))
(new-a (cons a c)))
(set-car! cn (cons a c))
(set-cdr! cn b)
; (evaluate cn) ==
((a new-a) cn)
))))
(define (op-b an)
(lambda (bn)
(lambda (cn)
(if (pair? (cdr an)) (set-cdr! an (evaluate (cdr an))))
(let
((a (cdr an))
(b (cdr bn))
(c (cdr cn)))
(set-car! cn a)
(set-cdr! cn (cons b c))
; (evaluate cn) ==
(a cn)
))))
(define (op-k an)
(lambda (bn)
(let ((val (cdr an)))
(if (pair? val)
(begin
(update-cdr! an val)
(cdr an))
val))
;(evaluate (cdr an))
))
(define (op-if tn)
(lambda (an)
(lambda (bn)
(let ((test (cdr tn)))
(if (pair? test)
(update-cdr! tn test))
(if (cdr tn)
(set-cdr! bn (cdr an)))
(set-car! bn op-i)
(evaluate bn)
))))
(define (op-nilp an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(null? (cdr an)))
(define (op-fixnum? an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(number? (cdr an)))
(define (op-pair? an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(and (vector? (cdr an))
(eq? (vector-ref (cdr an) 0) 1)))
(define (op-eq? an)
(if (pair? (cdr an))
(update-cdr! an (evaluate (cdr an))))
(lambda (bn)
(if (pair? (cdr bn))
(update-cdr! bn (evaluate (cdr bn))))
(eq? (cdr an) (cdr bn))))
; symbol type is 2
(define (op-symbol? an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(and (vector? (cdr an))
(eq? (vector-ref (cdr an) 0) 2)))
(define (op-cons an)
(lambda (bn)
(vector 1 (cdr an) (cdr bn))))
;
; ((mknode Type Size) a0 ... an) -> #(Type a0 ... an)
(define (halt . reason)
(apply print (cons "fvm: " reason))
(exit 1))
(define (op-car an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(let ((ob (cdr an)))
(if (vector? ob)
(let ((val (vector-ref ob 1)))
(if (pair? val)
(let ((val (evaluate val)))
(vector-set! ob 1 val)
val)
val)
;(evaluate val)
)
(halt "Bad car pair: " ob))))
(define (op-cdr an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(let ((ob (cdr an)))
(if (vector? ob)
(let ((val (vector-ref ob 2)))
(if (pair? val)
(let ((val (evaluate val)))
(vector-set! ob 2 val)
val)
val)
;(evaluate val)
)
(halt "Bad cdr pair: " ob))))
(define (num-op op)
(lambda (an)
(if (pair? (cdr an))
(update-cdr! an (cdr an)))
(cond
((number? (cdr an))
(lambda (bn)
(if (pair? (cdr bn))
(update-cdr! bn (cdr bn)))
(cond
((number? (cdr bn))
(set-car! bn op-ret)
(set-cdr! bn (op (cdr an) (cdr bn)))
(cdr bn))
(else
(print "not number in number op")))))
(else
(halt "bad number")))))
(define op-add (num-op +))
(define op-mul (num-op *))
(define op-neq (num-op =))
(define op-sub (num-op -))
(define op-div (num-op (lambda (a b) (floor (/ a b)))))
(define op-mod (num-op modulo))
(define op-< (num-op <))
(define op-> (num-op >))
; (probe b Y) = Y, sending byte X
(define (op-probe an)
(lambda (bn)
(let ((val (evaluate (cdr an))))
(if (and (number? val) (< val 256))
(lvm-emit-err val)
(print val)))
(evaluate (cdr bn))))
(define (op-mksym an)
(set-car! an op-ret)
(set-cdr! an (vector 2 (cdr an)))
(cdr an))
(define (unary-constructor type)
(if (= type 2)
op-mksym
(halt "no such unary constructor: " type)))
(define app-constructor
(lambda (an)
(lambda (bn)
(set-car! bn (cdr an))
(evaluate bn))))
(define (binary-constructor type)
(if (= type 0)
app-constructor
(halt "no such binary constructor: " type)))
(define op-mkapp app-constructor)
(define (make-constructor size type)
(cond
((= size 1)
(unary-constructor type))
((= size 2)
(binary-constructor type))
(else
(error "No this sized constructors yet: " size))))
(define (literal x) x)
(define prims
(vector
; 0 1 2 3 4 5 6 7 8 9
op-s op-k op-i op-b op-c op-s2 op-c2 op-b2 op-y op-y ; 0-9
op-i op-i op-i op-i op-i op-i op-i op-i op-i op-i ; 10-19
op-cons op-car op-cdr op-i op-i op-i op-i op-i op-i op-i ; 20-29
op-add op-sub op-mul op-div op-mod op-neq op-> op-< op-i op-i ; 30-39
op-if op-nilp op-fixnum? op-symbol? op-eq? op-probe op-mksym op-y op-pair? op-mkapp ; 40-49
))
(define (op-prim an)
(let ((val (evaluate (cdr an))))
(if (number? val)
(vector-ref prims val)
(halt "Bad primitive: " val))))
(vector-set! prims 47 op-prim)
(define combinators
`((#\k . ,op-k)
(#\+ . ,op-add)
(#\* . ,op-mul)
(#\- . ,op-sub)
(#\= . ,op-neq)
(#\> . ,op->)
(#\/ . ,op-div)
(#\% . ,op-mod)
(#\< . ,op-<)
(#\i . ,op-i)
(#\s . ,op-s)
(#\c . ,op-c)
(#\b . ,op-b)
(#\y . ,op-y)
(#\o . ,op-s2)
(#\m . ,op-c2)
(#\n . ,op-b2)
(#\I . ,op-if)
(#\C . ,op-cons)
(#\A . ,op-car)
(#\D . ,op-cdr)
(#\2 . ())
(#\3 . #t)
(#\4 . #f)
(#\N . ,op-nilp)
(#\U . ,op-fixnum?)
(#\P . ,op-pair?)
(#\S . ,op-symbol?)
(#\@ . ,op-probe)
(#\E . ,op-eq?)
(#\$ . ,op-prim)
))
; (if-pair T E (cons a b)) = (T a b)
; (if-pair T E _) = (E _)
(define (pair-dispatcher tn)
(lambda (en)
(lambda (on)
(if (pair? (cdr on))
(set-cdr! on (evaluate (cdr on))))
(let ((obj (cdr on)))
(if (and (vector? obj) (= 1 (vector-ref obj 0)))
(begin
(set-cdr! on (vector-ref obj 2))
(set-car! on
(cons (cdr tn) (vector-ref obj 1)))
(evaluate on))
(begin
(set-car! on (cdr en))
(evaluate on)))))))
(define (make-dispatcher type amount)
(if (and (= type 1) (= amount 2))
pair-dispatcher
(halt "fvm: no suitable dispatcher")))
(define magic (string->list "LEAF"))
(define (seek-magic port left)
(if (null? left)
(begin
;(print "fvm: good magic")
port)
(let ((this (read-char port)))
(cond
((eof-object? this)
(halt "fvm: found no magic"))
((eq? this (car left))
(seek-magic port (cdr left)))
(else
(seek-magic port magic))))))
(define (load-code port)
(let ((this (read-char port)))
;(print " got " this)
(cond
((eq? this #\newline)
(load-code port))
((eq? this #\space)
(let*
((rator (load-code port))
(rand (load-code port)))
(cons rator rand)))
((eq? this #\Q) ; mk size type
(let
((size (- (char->integer (read-char port)) 48))
(type (- (char->integer (read-char port)) 48)))
(make-constructor size type)))
((eq? this #\W) ; (dispatch type amount [then else obj])
(let
((type (- (char->integer (read-char port)) 48))
(amount (- (char->integer (read-char port)) 48)))
(make-dispatcher type amount)))
((assq this combinators) =>
(lambda (this) (cdr this)))
((eq? this #\l)
(let ((a (read-char port)))
(char->integer a)))
(else
(print "Error while loading, unknown char: " (char->integer this))))))
(define (lvm-emit byte)
(display (integer->char byte)))
(define (lvm-emit-err byte)
(for-each
(lambda (byte)
(display (integer->char byte)))
(list 27 91 51 49 109 byte 27 91 48 109)))
(define (io-trampoline code)
(set! root code)
(let ((value (evaluate code)))
(if (vector? value)
(let ((head (evaluate (vector-ref value 1))))
(if (and (number? head) (< head 256) (>= head 0))
(begin
; (print "lvm: io trampoline emitting " head)
(lvm-emit head)
(io-trampoline (vector-ref value 2)))
(begin
(print "lvm: io trampoline halting on " value)
value))))))
(define root #f)
(define (run path)
;(print "fvm: " path)
(let*
((port (open-input-file path))
(port (seek-magic port magic))
(code (load-code port)))
(io-trampoline
(cons code
(cons op-input
(current-input-port))))))
(let ((val (run (cadr (command-line-arguments)))))
;(print "fvm: -> " val)
(exit val))