634 lines
19 KiB
Scheme
634 lines
19 KiB
Scheme
; -*- scheme -*-
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(define Instructions
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(let ((e (table))
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(keys
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[:nop :dup :pop :call :tcall :jmp :brf :brt :jmp.l :brf.l :brt.l :ret
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:eq? :eqv? :equal? :atom? :not :null? :boolean? :symbol?
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:number? :bound? :pair? :builtin? :vector? :fixnum? :function?
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:cons :list :car :cdr :set-car! :set-cdr!
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:apply
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:+ :- :* :/ :div0 := :< :compare
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:vector :aref :aset!
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:loadt :loadf :loadnil :load0 :load1 :loadi8
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:loadv :loadv.l
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:loadg :loadg.l
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:loada :loada.l :loadc :loadc.l
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:setg :setg.l
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:seta :seta.l :setc :setc.l
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:closure :argc :vargc :trycatch :copyenv :let :for :tapply
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:add2 :sub2 :neg :largc :lvargc
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:loada0 :loada1 :loadc00 :loadc01 :call.l :tcall.l
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:brne :brne.l :cadr :brnn :brnn.l :brn :brn.l
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dummy_t dummy_f dummy_nil]))
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(for 0 (1- (length keys))
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(lambda (i)
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(put! e (aref keys i) i)))))
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(define arg-counts
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(table :eq? 2 :eqv? 2
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:equal? 2 :atom? 1
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:not 1 :null? 1
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:boolean? 1 :symbol? 1
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:number? 1 :bound? 1
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:pair? 1 :builtin? 1
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:vector? 1 :fixnum? 1
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:cons 2 :car 1
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:cdr 1 :set-car! 2
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:set-cdr! 2 := 2
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:< 2 :compare 2
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:aref 2 :aset! 3
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:div0 2))
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(define (make-code-emitter) (vector () (table) 0 +inf.0))
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(define (bcode:code b) (aref b 0))
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(define (bcode:ctable b) (aref b 1))
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(define (bcode:nconst b) (aref b 2))
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(define (bcode:cdepth b d) (aset! b 3 (min (aref b 3) d)))
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; get an index for a referenced value in a bytecode object
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(define (bcode:indexfor b v)
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(let ((const-to-idx (bcode:ctable b))
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(nconst (bcode:nconst b)))
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(if (has? const-to-idx v)
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(get const-to-idx v)
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(begin (put! const-to-idx v nconst)
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(prog1 nconst
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(aset! b 2 (+ nconst 1)))))))
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(define (emit e inst . args)
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(if (null? args)
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(if (and (eq? inst :car) (pair? (aref e 0))
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(eq? (car (aref e 0)) :cdr))
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(set-car! (aref e 0) :cadr)
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(aset! e 0 (cons inst (aref e 0))))
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(begin
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(if (memq inst '(:loadv :loadg :setg))
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(set! args (list (bcode:indexfor e (car args)))))
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(let ((longform
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(assq inst '((:loadv :loadv.l) (:loadg :loadg.l) (:setg :setg.l)
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(:loada :loada.l) (:seta :seta.l)))))
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(if (and longform
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(> (car args) 255))
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(set! inst (cadr longform))))
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(let ((longform
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(assq inst '((:loadc :loadc.l) (:setc :setc.l)))))
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(if (and longform
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(or (> (car args) 255)
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(> (cadr args) 255)))
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(set! inst (cadr longform))))
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(if (eq? inst :loada)
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(cond ((equal? args '(0))
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(set! inst :loada0)
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(set! args ()))
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((equal? args '(1))
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(set! inst :loada1)
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(set! args ()))))
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(if (eq? inst :loadc)
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(cond ((equal? args '(0 0))
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(set! inst :loadc00)
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(set! args ()))
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((equal? args '(0 1))
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(set! inst :loadc01)
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(set! args ()))))
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(let ((lasti (if (pair? (aref e 0))
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(car (aref e 0)) ()))
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(bc (aref e 0)))
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(cond ((and (eq? inst :brf) (eq? lasti :not)
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(eq? (cadr bc) :null?))
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(aset! e 0 (cons (car args) (cons :brn (cddr bc)))))
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((and (eq? inst :brf) (eq? lasti :not))
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(aset! e 0 (cons (car args) (cons :brt (cdr bc)))))
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((and (eq? inst :brf) (eq? lasti :eq?))
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(aset! e 0 (cons (car args) (cons :brne (cdr bc)))))
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((and (eq? inst :brf) (eq? lasti :null?))
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(aset! e 0 (cons (car args) (cons :brnn (cdr bc)))))
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((and (eq? inst :brt) (eq? lasti :null?))
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(aset! e 0 (cons (car args) (cons :brn (cdr bc)))))
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(else
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(aset! e 0 (nreconc (cons inst args) bc)))))))
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e)
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(define (make-label e) (gensym))
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(define (mark-label e l) (emit e :label l))
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; convert symbolic bytecode representation to a byte array.
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; labels are fixed-up.
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(define (encode-byte-code e)
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(let* ((cl (reverse! e))
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(v (list->vector cl))
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(long? (>= (+ (length v) ; 1 byte for each entry, plus...
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; at most half the entries in this vector can be
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; instructions accepting 32-bit arguments
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(* 3 (div0 (length v) 2))
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#;(* 3 (count (lambda (i)
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(memq i '(:loadv.l :loadg.l :setg.l
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:loada.l :seta.l :loadc.l
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:setc.l :jmp :brt :brf
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:largc :lvargc)))
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cl)))
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65536)))
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(let ((n (length v))
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(i 0)
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(label-to-loc (table))
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(fixup-to-label (table))
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(bcode (buffer))
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(vi #f)
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(nxt #f))
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(io.write bcode #int32(0))
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(while (< i n)
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(begin
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(set! vi (aref v i))
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(if (eq? vi :label)
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(begin (put! label-to-loc (aref v (+ i 1)) (sizeof bcode))
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(set! i (+ i 2)))
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(begin
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(io.write bcode
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(byte
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(get Instructions
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(if long?
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(case vi
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(:jmp :jmp.l)
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(:brt :brt.l)
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(:brf :brf.l)
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(:brne :brne.l)
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(:brnn :brnn.l)
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(:brn :brn.l)
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(else vi))
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vi))))
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(set! i (+ i 1))
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(set! nxt (if (< i n) (aref v i) #f))
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(cond ((memq vi '(:jmp :brf :brt :brne :brnn :brn))
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(put! fixup-to-label (sizeof bcode) nxt)
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(io.write bcode ((if long? int32 int16) 0))
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(set! i (+ i 1)))
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((number? nxt)
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(case vi
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((:loadv.l :loadg.l :setg.l :loada.l :seta.l
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:largc :lvargc :call.l :tcall.l)
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(io.write bcode (int32 nxt))
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(set! i (+ i 1)))
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((:loadc :setc) ; 2 uint8 args
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(io.write bcode (uint8 nxt))
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(set! i (+ i 1))
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(io.write bcode (uint8 (aref v i)))
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(set! i (+ i 1)))
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((:loadc.l :setc.l) ; 2 int32 args
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(io.write bcode (int32 nxt))
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(set! i (+ i 1))
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(io.write bcode (int32 (aref v i)))
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(set! i (+ i 1)))
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(else
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; other number arguments are always uint8
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(io.write bcode (uint8 nxt))
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(set! i (+ i 1)))))
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(else #f))))))
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(table.foreach
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(lambda (addr labl)
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(begin (io.seek bcode addr)
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(io.write bcode ((if long? int32 int16)
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(- (get label-to-loc labl)
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addr)))))
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fixup-to-label)
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(io.tostring! bcode))))
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(define (const-to-idx-vec e)
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(let ((cvec (vector.alloc (bcode:nconst e))))
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(table.foreach (lambda (val idx) (aset! cvec idx val))
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(bcode:ctable e))
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cvec))
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(define (index-of item lst start)
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(cond ((null? lst) #f)
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((eq? item (car lst)) start)
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(else (index-of item (cdr lst) (+ start 1)))))
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(define (in-env? s env) (any (lambda (e) (memq s e)) env))
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(define (lookup-sym s env lev arg?)
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(if (null? env)
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'(global)
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(let* ((curr (car env))
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(i (index-of s curr 0)))
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(if i
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(if arg?
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`(arg ,i)
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`(closed ,lev ,i))
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(lookup-sym s
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(cdr env)
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(if (or arg? (null? curr)) lev (+ lev 1))
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#f)))))
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; number of non-nulls
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(define (nnn e) (count (lambda (x) (not (null? x))) e))
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(define (printable? x) (not (iostream? x)))
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(define (compile-sym g env s Is)
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(let ((loc (lookup-sym s env 0 #t)))
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(case (car loc)
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(arg (emit g (aref Is 0) (cadr loc)))
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(closed (emit g (aref Is 1) (cadr loc) (caddr loc))
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; update index of most distant captured frame
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(bcode:cdepth g (- (nnn (cdr env)) 1 (cadr loc))))
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(else
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(if (and (constant? s)
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(printable? (top-level-value s)))
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(emit g :loadv (top-level-value s))
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(emit g (aref Is 2) s))))))
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(define (compile-if g env tail? x)
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(let ((elsel (make-label g))
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(endl (make-label g))
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(test (cadr x))
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(then (caddr x))
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(else (if (pair? (cdddr x))
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(cadddr x)
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#f)))
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(cond ((eq? test #t)
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(compile-in g env tail? then))
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((eq? test #f)
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(compile-in g env tail? else))
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(else
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(compile-in g env #f test)
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(emit g :brf elsel)
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(compile-in g env tail? then)
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(if tail?
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(emit g :ret)
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(emit g :jmp endl))
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(mark-label g elsel)
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(compile-in g env tail? else)
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(mark-label g endl)))))
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(define (compile-begin g env tail? forms)
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(cond ((atom? forms) (compile-in g env tail? #f))
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((atom? (cdr forms))
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(compile-in g env tail? (car forms)))
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(else
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(compile-in g env #f (car forms))
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(emit g :pop)
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(compile-begin g env tail? (cdr forms)))))
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(define (compile-prog1 g env x)
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(compile-in g env #f (cadr x))
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(if (pair? (cddr x))
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(begin (compile-begin g env #f (cddr x))
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(emit g :pop))))
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(define (compile-while g env cond body)
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(let ((top (make-label g))
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(end (make-label g)))
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(compile-in g env #f #f)
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(mark-label g top)
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(compile-in g env #f cond)
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(emit g :brf end)
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(emit g :pop)
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(compile-in g env #f body)
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(emit g :jmp top)
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(mark-label g end)))
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(define (1arg-lambda? func)
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(and (pair? func)
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(eq? (car func) 'lambda)
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(pair? (cdr func))
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(pair? (cadr func))
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(length= (cadr func) 1)))
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(define (compile-for g env lo hi func)
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(if (1arg-lambda? func)
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(begin (compile-in g env #f lo)
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(compile-in g env #f hi)
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(compile-in g env #f func)
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(emit g :for))
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(error "for: third form must be a 1-argument lambda")))
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(define (compile-short-circuit g env tail? forms default branch)
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(cond ((atom? forms) (compile-in g env tail? default))
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((atom? (cdr forms)) (compile-in g env tail? (car forms)))
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(else
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(let ((end (make-label g)))
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(compile-in g env #f (car forms))
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(emit g :dup)
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(emit g branch end)
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(emit g :pop)
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(compile-short-circuit g env tail? (cdr forms) default branch)
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(mark-label g end)))))
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(define (compile-and g env tail? forms)
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(compile-short-circuit g env tail? forms #t :brf))
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(define (compile-or g env tail? forms)
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(compile-short-circuit g env tail? forms #f :brt))
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(define (compile-arglist g env lst)
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(for-each (lambda (a)
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(compile-in g env #f a))
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lst)
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(length lst))
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(define (argc-error head count)
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(error (string "compile error: " head " expects " count
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(if (= count 1)
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" argument."
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" arguments."))))
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(define (compile-app g env tail? x)
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(let ((head (car x)))
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(if (and (pair? head)
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(eq? (car head) 'lambda)
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(list? (cadr head))
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(not (length> (cadr head) 255)))
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(compile-let g env tail? x)
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(compile-call g env tail? x))))
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(define (compile-let g env tail? x)
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(let ((head (car x))
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(args (cdr x)))
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(unless (length= args (length (cadr head)))
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(error (string "apply: incorrect number of arguments to " head)))
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(receive (the-f dept) (compile-f- env head #t)
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(emit g :loadv the-f)
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(bcode:cdepth g dept))
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(let ((nargs (compile-arglist g env args)))
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(emit g :copyenv)
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(emit g (if tail? :tcall :call) (+ 1 nargs)))))
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(define builtin->instruction
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(let ((b2i (table number? :number? cons :cons
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fixnum? :fixnum? equal? :equal?
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eq? :eq? symbol? :symbol?
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div0 :div0 builtin? :builtin?
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aset! :aset! - :- boolean? :boolean? not :not
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apply :apply atom? :atom?
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set-cdr! :set-cdr! / :/
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function? :function? vector :vector
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list :list bound? :bound?
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< :< * :* cdr :cdr null? :null?
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+ :+ eqv? :eqv? compare :compare aref :aref
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set-car! :set-car! car :car
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pair? :pair? = := vector? :vector?)))
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(lambda (b)
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(get b2i b #f))))
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(define (compile-builtin-call g env tail? x head b nargs)
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(let ((count (get arg-counts b #f)))
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(if (and count
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(not (length= (cdr x) count)))
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(argc-error head count))
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(case b ; handle special cases of vararg builtins
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(:list (if (= nargs 0) (emit g :loadnil) (emit g b nargs)))
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(:+ (cond ((= nargs 0) (emit g :load0))
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((= nargs 2) (emit g :add2))
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(else (emit g b nargs))))
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(:- (cond ((= nargs 0) (argc-error head 1))
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((= nargs 1) (emit g :neg))
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((= nargs 2) (emit g :sub2))
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(else (emit g b nargs))))
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(:* (if (= nargs 0) (emit g :load1)
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(emit g b nargs)))
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(:/ (if (= nargs 0)
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(argc-error head 1)
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(emit g b nargs)))
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(:vector (if (= nargs 0)
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(emit g :loadv [])
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(emit g b nargs)))
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(:apply (if (< nargs 2)
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(argc-error head 2)
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(emit g (if tail? :tapply :apply) nargs)))
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(else (emit g b)))))
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(define (compile-call g env tail? x)
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(let ((head (car x)))
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(let ((head
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(if (and (symbol? head)
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(not (in-env? head env))
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(bound? head)
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(constant? head)
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(builtin? (top-level-value head)))
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(top-level-value head)
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head)))
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(if (length> (cdr x) 255)
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; more than 255 arguments, need long versions of instructions
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(begin (compile-in g env #f head)
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(let ((nargs (compile-arglist g env (cdr x))))
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(emit g (if tail? :tcall.l :call.l) nargs)))
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(let ((b (and (builtin? head)
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(builtin->instruction head))))
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(if (and (eq? head 'cadr)
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(not (in-env? head env))
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(equal? (top-level-value 'cadr) cadr)
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(length= x 2))
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(begin (compile-in g env #f (cadr x))
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(emit g :cadr))
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(begin
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(if (not b)
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(compile-in g env #f head))
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(let ((nargs (compile-arglist g env (cdr x))))
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(if b
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(compile-builtin-call g env tail? x head b nargs)
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(emit g (if tail? :tcall :call) nargs))))))))))
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(define (expand-define form body)
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(if (symbol? form)
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`(set! ,form ,(car body))
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`(set! ,(car form)
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(lambda ,(cdr form) ,@body . ,(car form)))))
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(define (fits-i8 x) (and (fixnum? x) (>= x -128) (<= x 127)))
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(define (compile-in g env tail? x)
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(cond ((symbol? x) (compile-sym g env x [:loada :loadc :loadg]))
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((atom? x)
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(cond ((eq? x 0) (emit g :load0))
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((eq? x 1) (emit g :load1))
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((eq? x #t) (emit g :loadt))
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((eq? x #f) (emit g :loadf))
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((eq? x ()) (emit g :loadnil))
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((fits-i8 x) (emit g :loadi8 x))
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(else (emit g :loadv x))))
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(else
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(case (car x)
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(quote (emit g :loadv (cadr x)))
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(if (compile-if g env tail? x))
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(begin (compile-begin g env tail? (cdr x)))
|
|
(prog1 (compile-prog1 g env x))
|
|
(lambda (receive (the-f dept) (compile-f- env x)
|
|
(begin (emit g :loadv the-f)
|
|
(bcode:cdepth g dept)
|
|
(if (< dept (nnn env))
|
|
(emit g :closure)))))
|
|
(and (compile-and g env tail? (cdr x)))
|
|
(or (compile-or g env tail? (cdr x)))
|
|
(while (compile-while g env (cadr x) (cons 'begin (cddr x))))
|
|
(for (compile-for g env (cadr x) (caddr x) (cadddr x)))
|
|
(return (compile-in g env #t (cadr x))
|
|
(emit g :ret))
|
|
(set! (compile-in g env #f (caddr x))
|
|
(compile-sym g env (cadr x) [:seta :setc :setg]))
|
|
(define (compile-in g env tail?
|
|
(expand-define (cadr x) (cddr x))))
|
|
(trycatch (compile-in g env #f `(lambda () ,(cadr x)))
|
|
(unless (1arg-lambda? (caddr x))
|
|
(error "trycatch: second form must be a 1-argument lambda"))
|
|
(compile-in g env #f (caddr x))
|
|
(emit g :trycatch))
|
|
(else (compile-app g env tail? x))))))
|
|
|
|
(define (compile-f env f . let?)
|
|
(receive (ff ignore)
|
|
(apply compile-f- env f let?)
|
|
ff))
|
|
|
|
(define get-defined-vars
|
|
(letrec ((get-defined-vars-
|
|
(lambda (expr)
|
|
(cond ((atom? expr) ())
|
|
((and (eq? (car expr) 'define)
|
|
(pair? (cdr expr)))
|
|
(or (and (symbol? (cadr expr))
|
|
(list (cadr expr)))
|
|
(and (pair? (cadr expr))
|
|
(symbol? (caadr expr))
|
|
(list (caadr expr)))
|
|
()))
|
|
((eq? (car expr) 'begin)
|
|
(apply append (map get-defined-vars- (cdr expr))))
|
|
(else ())))))
|
|
(lambda (expr) (delete-duplicates (get-defined-vars- expr)))))
|
|
|
|
(define compile-f-
|
|
(let ((*defines-processed-token* (gensym)))
|
|
; to eval a top-level expression we need to avoid internal define
|
|
(set-top-level-value!
|
|
'compile-thunk
|
|
(lambda (expr)
|
|
(compile `(lambda () ,expr . ,*defines-processed-token*))))
|
|
|
|
(lambda (env f . let?)
|
|
; convert lambda to one body expression and process internal defines
|
|
(define (lambda-body e)
|
|
(let ((B (if (pair? (cddr e))
|
|
(if (pair? (cdddr e))
|
|
(cons 'begin (cddr e))
|
|
(caddr e))
|
|
#f)))
|
|
(let ((V (get-defined-vars B)))
|
|
(if (null? V)
|
|
B
|
|
(cons (list* 'lambda V B *defines-processed-token*)
|
|
(map (lambda (x) #f) V))))))
|
|
|
|
(let ((g (make-code-emitter))
|
|
(args (cadr f))
|
|
(name (if (eq? (lastcdr f) *defines-processed-token*)
|
|
'lambda
|
|
(lastcdr f))))
|
|
(cond ((not (null? let?)) (emit g :let))
|
|
((length> args 255) (emit g (if (null? (lastcdr args))
|
|
:largc :lvargc)
|
|
(length args)))
|
|
((null? (lastcdr args)) (emit g :argc (length args)))
|
|
(else (emit g :vargc (if (atom? args) 0 (length args)))))
|
|
(compile-in g (cons (to-proper args) env) #t
|
|
(if (eq? (lastcdr f) *defines-processed-token*)
|
|
(caddr f)
|
|
(lambda-body f)))
|
|
(emit g :ret)
|
|
(values (function (encode-byte-code (bcode:code g))
|
|
(const-to-idx-vec g) name)
|
|
(aref g 3))))))
|
|
|
|
(define (compile f) (compile-f () f))
|
|
|
|
(define (ref-int32-LE a i)
|
|
(int32 (+ (ash (aref a (+ i 0)) 0)
|
|
(ash (aref a (+ i 1)) 8)
|
|
(ash (aref a (+ i 2)) 16)
|
|
(ash (aref a (+ i 3)) 24))))
|
|
|
|
(define (ref-int16-LE a i)
|
|
(int16 (+ (ash (aref a (+ i 0)) 0)
|
|
(ash (aref a (+ i 1)) 8))))
|
|
|
|
(define (hex5 n)
|
|
(string.lpad (number->string n 16) 5 #\0))
|
|
|
|
(define (disassemble f . lev?)
|
|
(if (null? lev?)
|
|
(begin (disassemble f 0)
|
|
(newline)
|
|
(return #t)))
|
|
(let ((lev (car lev?))
|
|
(code (function:code f))
|
|
(vals (function:vals f)))
|
|
(define (print-val v)
|
|
(if (and (function? v) (not (builtin? v)))
|
|
(begin (princ "\n")
|
|
(disassemble v (+ lev 1)))
|
|
(print v)))
|
|
(dotimes (xx lev) (princ "\t"))
|
|
(princ "maxstack " (ref-int32-LE code 0) "\n")
|
|
(let ((i 4)
|
|
(N (length code)))
|
|
(while (< i N)
|
|
; find key whose value matches the current byte
|
|
(let ((inst (table.foldl (lambda (k v z)
|
|
(or z (and (eq? v (aref code i))
|
|
k)))
|
|
#f Instructions)))
|
|
(if (> i 4) (newline))
|
|
(dotimes (xx lev) (princ "\t"))
|
|
(princ (hex5 (- i 4)) ": "
|
|
(string.tail (string inst) 1) "\t")
|
|
(set! i (+ i 1))
|
|
(case inst
|
|
((:loadv.l :loadg.l :setg.l)
|
|
(print-val (aref vals (ref-int32-LE code i)))
|
|
(set! i (+ i 4)))
|
|
|
|
((:loadv :loadg :setg)
|
|
(print-val (aref vals (aref code i)))
|
|
(set! i (+ i 1)))
|
|
|
|
((:loada :seta :call :tcall :list :+ :- :* :/ :vector
|
|
:argc :vargc :loadi8 :apply :tapply)
|
|
(princ (number->string (aref code i)))
|
|
(set! i (+ i 1)))
|
|
|
|
((:loada.l :seta.l :largc :lvargc :call.l :tcall.l)
|
|
(princ (number->string (ref-int32-LE code i)))
|
|
(set! i (+ i 4)))
|
|
|
|
((:loadc :setc)
|
|
(princ (number->string (aref code i)) " ")
|
|
(set! i (+ i 1))
|
|
(princ (number->string (aref code i)))
|
|
(set! i (+ i 1)))
|
|
|
|
((:loadc.l :setc.l)
|
|
(princ (number->string (ref-int32-LE code i)) " ")
|
|
(set! i (+ i 4))
|
|
(princ (number->string (ref-int32-LE code i)))
|
|
(set! i (+ i 4)))
|
|
|
|
((:jmp :brf :brt :brne :brnn :brn)
|
|
(princ "@" (hex5 (+ i -4 (ref-int16-LE code i))))
|
|
(set! i (+ i 2)))
|
|
|
|
((:jmp.l :brf.l :brt.l :brne.l :brnn.l :brn.l)
|
|
(princ "@" (hex5 (+ i -4 (ref-int32-LE code i))))
|
|
(set! i (+ i 4)))
|
|
|
|
(else #f)))))))
|
|
|
|
#t
|