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(.module:
lux
(lux (control [monad #+ do])
(data [text]
text/format
(coll [list "list/" Functor<List> Monoid<List>]))
[macro])
(luxc ["&" lang]
(lang [".L" host]
(host ["$" jvm]
(jvm ["$t" type]
["$d" def]
["$i" inst]))
["la" analysis]
["ls" synthesis]
(translation [".T" common]
[".T" runtime]
[".T" reference])
[".L" variable #+ Variable Register])))
(def: (constant? register changeS)
(-> Register ls.Synthesis Bool)
(case changeS
(^multi (^code ((~ [_ (#.Int var)])))
(i/= (variableL.local register)
var))
true
_
false))
(def: #export (translate-recur translate argsS)
(-> (-> ls.Synthesis (Meta $.Inst))
(List ls.Synthesis)
(Meta $.Inst))
(do macro.Monad<Meta>
[[@begin offset] hostL.anchor
#let [pairs (list.zip2 (list.n/range offset (|> (list.size argsS) n/dec (n/+ offset)))
argsS)]
## It may look weird that first I compile the values separately,
## and then I compile the stores/allocations.
## It must be done that way in order to avoid a potential bug.
## Let's say that you'll recur with 2 expressions: X and Y.
## If Y depends on the value of X, and you don't compile values
## and stores separately, then by the time Y is evaluated, it
## will refer to the new value of X, instead of the old value, as
## must be the case.
valuesI+ (monad.map @ (function [[register argS]]
(: (Meta $.Inst)
(if (constant? register argS)
(wrap id)
(translate argS))))
pairs)
#let [storesI+ (list/map (function [[register argS]]
(: $.Inst
(if (constant? register argS)
id
($i.ASTORE register))))
(list.reverse pairs))]]
(wrap (|>> ($i.fuse valuesI+)
($i.fuse storesI+)
($i.GOTO @begin)))))
(def: #export (translate-loop translate offset initsS+ bodyS)
(-> (-> ls.Synthesis (Meta $.Inst))
Nat (List ls.Synthesis) ls.Synthesis
(Meta $.Inst))
(do macro.Monad<Meta>
[@begin $i.make-label
initsI+ (monad.map @ translate initsS+)
bodyI (hostL.with-anchor [@begin offset]
(translate bodyS))
#let [initializationI (|> (list.enumerate initsI+)
(list/map (function [[register initI]]
(|>> initI
($i.ASTORE (n/+ offset register)))))
$i.fuse)]]
(wrap (|>> initializationI
($i.label @begin)
bodyI))))
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