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(.module:
[lux (#- Type if let case)
[abstract
[monad (#+ do)]]
[control
["." function]
["ex" exception (#+ exception:)]]
[data
[number
["n" nat]]
[collection
["." list ("#@." fold)]]]
[target
[jvm
["." type (#+ Type)
["." category (#+ Void Value Return Primitive Object Class Array Var Parameter Method)]
["." descriptor (#+ Descriptor)]
["." signature (#+ Signature)]]]]
[tool
[compiler
["." phase ("operation@." monad)]
[meta
[archive (#+ Archive)]]
[language
[lux
["." synthesis (#+ Path Synthesis)]]]]]]
[luxc
[lang
[host
["$" jvm (#+ Label Inst Operation Phase Generator)
["_" inst]]]]]
["." //
["." runtime]])
(def: (pop-altI stack-depth)
(-> Nat Inst)
(.case stack-depth
0 function.identity
1 _.POP
2 _.POP2
_ ## (n.> 2)
(|>> _.POP2
(pop-altI (n.- 2 stack-depth)))))
(def: peekI
Inst
(|>> _.DUP
(_.int +0)
_.AALOAD))
(def: pushI
Inst
(_.INVOKESTATIC //.$Runtime "pm_push" (type.method [(list runtime.$Stack //.$Value) runtime.$Stack (list)])))
(def: popI
(|>> (_.int +1)
_.AALOAD
(_.CHECKCAST runtime.$Stack)))
(def: (left-projection lefts)
(-> Nat Inst)
(.let [accessI (.case lefts
0
_.AALOAD
lefts
(_.INVOKESTATIC //.$Runtime "tuple_left" (type.method [(list //.$Tuple runtime.$Index) //.$Value (list)])))]
(|>> (_.CHECKCAST //.$Tuple)
(_.int (.int lefts))
accessI)))
(def: (right-projection lefts)
(-> Nat Inst)
(|>> (_.CHECKCAST //.$Tuple)
(_.int (.int lefts))
(_.INVOKESTATIC //.$Runtime "tuple_right" (type.method [(list //.$Tuple runtime.$Index) //.$Value (list)]))))
(def: (path' stack-depth @else @end phase archive path)
(-> Nat Label Label Phase Archive Path (Operation Inst))
(.case path
#synthesis.Pop
(operation@wrap ..popI)
(#synthesis.Bind register)
(operation@wrap (|>> peekI
(_.ASTORE register)))
(^ (synthesis.path/bit value))
(operation@wrap (.let [jumpI (.if value _.IFEQ _.IFNE)]
(|>> peekI
(_.unwrap type.boolean)
(jumpI @else))))
(^ (synthesis.path/i64 value))
(operation@wrap (|>> peekI
(_.unwrap type.long)
(_.long (.int value))
_.LCMP
(_.IFNE @else)))
(^ (synthesis.path/f64 value))
(operation@wrap (|>> peekI
(_.unwrap type.double)
(_.double value)
_.DCMPL
(_.IFNE @else)))
(^ (synthesis.path/text value))
(operation@wrap (|>> peekI
(_.string value)
(_.INVOKEVIRTUAL (type.class "java.lang.Object" (list))
"equals"
(type.method [(list //.$Value) type.boolean (list)]))
(_.IFEQ @else)))
(#synthesis.Then bodyS)
(do phase.monad
[bodyI (phase archive bodyS)]
(wrap (|>> (pop-altI stack-depth)
bodyI
(_.GOTO @end))))
(^template [<pattern> <flag> <prepare>]
(^ (<pattern> idx))
(operation@wrap (<| _.with-label (function (_ @success))
_.with-label (function (_ @fail))
(|>> peekI
(_.CHECKCAST //.$Variant)
(_.int (.int (<prepare> idx)))
<flag>
(_.INVOKESTATIC //.$Runtime "pm_variant" (type.method [(list //.$Variant runtime.$Tag runtime.$Flag) runtime.$Value (list)]))
_.DUP
(_.IFNULL @fail)
(_.GOTO @success)
(_.label @fail)
_.POP
(_.GOTO @else)
(_.label @success)
pushI))))
([synthesis.side/left _.NULL function.identity]
[synthesis.side/right (_.string "") .inc])
(^ (synthesis.member/left lefts))
(operation@wrap (|>> peekI
(..left-projection lefts)
pushI))
(^ (synthesis.member/right lefts))
(operation@wrap (|>> peekI
(..right-projection lefts)
pushI))
## Extra optimization
(^ (synthesis.path/seq
(synthesis.member/left 0)
(synthesis.!bind-top register thenP)))
(do phase.monad
[then! (path' stack-depth @else @end phase archive thenP)]
(wrap (|>> peekI
(_.CHECKCAST //.$Tuple)
(_.int +0)
_.AALOAD
(_.ASTORE register)
then!)))
## Extra optimization
(^template [<pm> <getter>]
(^ (synthesis.path/seq
(<pm> lefts)
(synthesis.!bind-top register thenP)))
(do phase.monad
[then! (path' stack-depth @else @end phase archive thenP)]
(wrap (|>> peekI
(_.CHECKCAST //.$Tuple)
(_.int (.int lefts))
(_.INVOKESTATIC //.$Runtime <getter> (type.method [(list //.$Tuple runtime.$Index) //.$Value (list)]))
(_.ASTORE register)
then!))))
([synthesis.member/left "tuple_left"]
[synthesis.member/right "tuple_right"])
(#synthesis.Alt leftP rightP)
(do phase.monad
[@alt-else _.make-label
leftI (path' (inc stack-depth) @alt-else @end phase archive leftP)
rightI (path' stack-depth @else @end phase archive rightP)]
(wrap (|>> _.DUP
leftI
(_.label @alt-else)
_.POP
rightI)))
(#synthesis.Seq leftP rightP)
(do phase.monad
[leftI (path' stack-depth @else @end phase archive leftP)
rightI (path' stack-depth @else @end phase archive rightP)]
(wrap (|>> leftI
rightI)))
))
(def: (path @end phase archive path)
(-> Label Phase Archive Path (Operation Inst))
(do phase.monad
[@else _.make-label
pathI (..path' 1 @else @end phase archive path)]
(wrap (|>> pathI
(_.label @else)
_.POP
(_.INVOKESTATIC //.$Runtime "pm_fail" (type.method [(list) type.void (list)]))
_.NULL
(_.GOTO @end)))))
(def: #export (if phase archive [testS thenS elseS])
(Generator [Synthesis Synthesis Synthesis])
(do phase.monad
[testI (phase archive testS)
thenI (phase archive thenS)
elseI (phase archive elseS)]
(wrap (<| _.with-label (function (_ @else))
_.with-label (function (_ @end))
(|>> testI
(_.unwrap type.boolean)
(_.IFEQ @else)
thenI
(_.GOTO @end)
(_.label @else)
elseI
(_.label @end))))))
(def: #export (let phase archive [inputS register exprS])
(Generator [Synthesis Nat Synthesis])
(do phase.monad
[inputI (phase archive inputS)
exprI (phase archive exprS)]
(wrap (|>> inputI
(_.ASTORE register)
exprI))))
(def: #export (get phase archive [path recordS])
(Generator [(List synthesis.Member) Synthesis])
(do phase.monad
[recordG (phase archive recordS)]
(wrap (list@fold (function (_ step so-far)
(.let [next (.case step
(#.Left lefts)
(..left-projection lefts)
(#.Right lefts)
(..right-projection lefts))]
(|>> so-far next)))
recordG
path))))
(def: #export (case phase archive [valueS path])
(Generator [Synthesis Path])
(do phase.monad
[@end _.make-label
valueI (phase archive valueS)
pathI (..path @end phase archive path)]
(wrap (|>> _.NULL
valueI
pushI
pathI
(_.label @end)))))
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