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|
(.module:
[lux #*
["." function]
[control
["." monad (#+ do)]]
[data
["." text
format]
[collection
["." list ("#/." functor monoid)]]]
[tool
[compiler
[reference (#+ Register)]
["." synthesis (#+ Synthesis)]
["." phase
["." translation]]]]]
[luxc
[lang
[host
[jvm (#+ Inst Operation Phase)
["_" inst]]]]]
["." //])
(def: (constant? register changeS)
(-> Register Synthesis Bit)
(case changeS
(^ (synthesis.variable/local var))
(n/= register var)
_
#0))
(def: #export (recur translate argsS)
(-> Phase (List Synthesis) (Operation Inst))
(do phase.monad
[[@begin start] translation.anchor
#let [end (|> argsS list.size dec (n/+ start))
pairs (list.zip2 (list.n/range start end)
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
## should be the case.
valuesI+ (monad.map @ (function (_ [register argS])
(: (Operation Inst)
(if (constant? register argS)
(wrap function.identity)
(translate argS))))
pairs)
#let [storesI+ (list/map (function (_ [register argS])
(: Inst
(if (constant? register argS)
function.identity
(_.ASTORE register))))
(list.reverse pairs))]]
(wrap (|>> (_.fuse valuesI+)
(_.fuse storesI+)
(_.GOTO @begin)))))
(def: #export (scope translate [start initsS+ iterationS])
(-> Phase [Nat (List Synthesis) Synthesis] (Operation Inst))
(do phase.monad
[@begin _.make-label
initsI+ (monad.map @ translate initsS+)
iterationI (translation.with-anchor [@begin start]
(translate iterationS))
#let [initializationI (|> (list.enumerate initsI+)
(list/map (function (_ [register initI])
(|>> initI
(_.ASTORE (n/+ start register)))))
_.fuse)]]
(wrap (|>> initializationI
(_.label @begin)
iterationI))))
|
