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