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; things that a future assembler will need separate memory for:
; code; types; args channel
(def clear ()
(= types* (obj
integer (obj size 1)
type (obj size 1)
location (obj size 1)
address (obj size 1)
boolean (obj size 1)))
(= memory* (table))
(= function* (table)))
(clear)
; just a convenience until we get an assembler
(= type* (obj integer 0 type 1 location 2 address 3 boolean 4))
(def add-fns (fns)
(each (name . body) fns
(= function*.name body)))
(def run (instrs (o fn-args) (o otypes))
(ret result nil
(let fn-arg-idx 0
;? (prn instrs)
(for pc 0 (< pc len.instrs) (++ pc)
(let instr instrs.pc
;? (prn memory*)
;? (prn pc ": " instr)
(let delim (or (pos '<- instr) -1)
(with (oarg (if (>= delim 0)
(cut instr 0 delim))
op (instr (+ delim 1))
arg (cut instr (+ delim 2)))
;? (prn op " " oarg)
(case op
loadi
(= (memory* oarg.0.1) arg.0)
add
;? (do (prn "add " arg.0.1 arg.1.1)
(= (memory* oarg.0.1)
(+ (memory* arg.0.1) (memory* arg.1.1)))
;? (prn "add2"))
sub
(= (memory* oarg.0.1)
(- (memory* arg.0.1) (memory* arg.1.1)))
mul
(= (memory* oarg.0.1)
(* (memory* arg.0.1) (memory* arg.1.1)))
div
(= (memory* oarg.0.1)
(/ (real (memory* arg.0.1)) (memory* arg.1.1)))
idiv
(= (memory* oarg.0.1)
(trunc:/ (memory* arg.0.1) (memory* arg.1.1))
(memory* oarg.1.1)
(mod (memory* arg.0.1) (memory* arg.1.1)))
and
(= (memory* oarg.0.1)
(and (memory* arg.0.1) (memory* arg.1.1)))
or
(= (memory* oarg.0.1)
(and (memory* arg.0.1) (memory* arg.1.1)))
not
(= (memory* oarg.0.1)
(not (memory* arg.0.1)))
eq
(= (memory* oarg.0.1)
(iso (memory* arg.0.1) (memory* arg.1.1)))
neq
(= (memory* oarg.0.1)
(~iso (memory* arg.0.1) (memory* arg.1.1)))
lt
(= (memory* oarg.0.1)
(< (memory* arg.0.1) (memory* arg.1.1)))
gt
(= (memory* oarg.0.1)
(> (memory* arg.0.1) (memory* arg.1.1)))
le
(= (memory* oarg.0.1)
(<= (memory* arg.0.1) (memory* arg.1.1)))
ge
(= (memory* oarg.0.1)
(>= (memory* arg.0.1) (memory* arg.1.1)))
arg
(let idx (if arg
arg.0
(do1 fn-arg-idx
++.fn-arg-idx))
(= (memory* oarg.0.1)
(memory* fn-args.idx.1)))
otype
(= (memory* oarg.0.1)
(type* (otypes arg.0)))
jmp
(do (= pc (+ pc arg.0.1)) ; relies on continue still incrementing (bug)
;? (prn "jumping to " pc)
(continue))
jif
(when (is t (memory* arg.0.1))
;? (prn "jumping to " arg.1.1)
(= pc (+ pc arg.1.1)) ; relies on continue still incrementing (bug)
(continue))
reply
(do (= result arg)
(break))
; else user-defined function
(let-or new-body function*.op (prn "no definition for " op)
;? (prn "== " memory*)
(let results (run new-body arg (map car oarg))
(each o oarg
;? (prn o)
(= (memory* o.1) (memory* pop.results.1)))))
)))))
;? (prn "return " result)
)))
;? (mac assert (expr)
;? `(if (no ,expr)
;? (err "assertion failed: " ',expr)))
(def convert-braces (instrs)
(let locs () ; list of information on each brace: (open/close pc)
(let pc 0
(loop (instrs instrs)
(each instr instrs
(if (~is 'begin instr.0)
(do
;? (prn pc " " instr)
(++ pc))
; hack: racket replaces curlies with parens, so we need the
; keyword begin to delimit blocks.
; ultimately there'll be no nesting and curlies will just be in a
; line by themselves.
(do
;? (prn `(open ,pc))
(push `(open ,pc) locs)
(recur cdr.instr)
;? (prn `(close ,pc))
(push `(close ,pc) locs))))))
(zap rev locs)
;? (prn locs)
(with (pc 0
stack ()) ; elems are pcs
(accum yield
(loop (instrs instrs)
(each instr instrs
(let delim (or (pos '<- instr) -1)
(with (oarg (if (>= delim 0)
(cut instr 0 delim))
op (instr (+ delim 1))
arg (cut instr (+ delim 2)))
;? (prn op " " oarg)
(case op
begin
(do
(push pc stack)
(assert:is oarg nil)
(recur arg)
(pop stack))
break
(do
(assert:is oarg nil)
(assert:is arg nil)
(yield `(jmp (offset ,(close-offset pc locs)))))
breakif
(do
;? (prn "breakif: " instr)
(assert:is oarg nil)
(yield `(jif ,arg.0 (offset ,(close-offset pc locs)))))
continue
(do
(assert:is oarg nil)
(assert:is arg nil)
(yield `(jmp (offset ,(- stack.0 pc)))))
continueif
(do
;? (prn "continueif: " instr)
(assert:is oarg nil)
(yield `(jif ,arg.0 (offset ,(- stack.0 pc)))))
;else
(yield instr))))
(++ pc)))))))
(def close-offset (pc locs)
(let close 0
(with (stacksize 0
done nil)
(each (state loc) locs
;? (prn " :" close " " state " - " loc)
(if (< loc pc)
nil ; do nothing
(no done)
(do
; first time
(when (and (is 0 stacksize) (~is loc pc))
(++ stacksize))
(if (is 'open state) (++ stacksize) (-- stacksize))
; last time
(when (is 0 stacksize)
(= close loc)
(set done))))))
(- close pc 1)))
(awhen cdr.argv
(each file it
;? (prn file)
(add-fns readfile.file))
;? (prn function*)
(run function*!main)
(prn memory*))
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