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(.module:
[lux (#- Type if let case int)
[abstract
["." monad (#+ do)]]
[control
["." function]]
[data
[number
["." i32]
["n" nat]]]
[target
[jvm
["_" bytecode (#+ Label Bytecode) ("#@." monad)]
["." type (#+ Type)
[category (#+ Method)]]]]]
["." // #_
["#." type]
["#." runtime (#+ Operation Phase)]
["#." value]
[////
[reference (#+ Register)]
["." synthesis (#+ Path Synthesis)]
["." generation]
["." phase ("operation@." monad)]]])
(def: equals-name
"equals")
(def: equals-type
(type.method [(list //type.value) type.boolean (list)]))
(def: (pop-alt stack-depth)
(-> Nat (Bytecode Any))
(.case stack-depth
0 (_@wrap [])
1 _.pop
2 _.pop2
_ ## (n.> 2)
($_ _.compose
_.pop2
(pop-alt (n.- 2 stack-depth)))))
(def: int
(-> (I64 Any) (Bytecode Any))
(|>> .i64 i32.i32 _.int))
(def: long
(-> (I64 Any) (Bytecode Any))
(|>> .int _.long))
(def: double
(-> Frac (Bytecode Any))
(|>> _.double))
(def: peek
(Bytecode Any)
($_ _.compose
_.dup
(//runtime.get //runtime.stack-head)))
(def: pop
(Bytecode Any)
($_ _.compose
(//runtime.get //runtime.stack-tail)
(_.checkcast //type.stack)))
(def: (path' phase stack-depth @else @end path)
(-> Phase Nat Label Label Path (Operation (Bytecode Any)))
(.case path
#synthesis.Pop
(operation@wrap ..pop)
(#synthesis.Bind register)
(operation@wrap ($_ _.compose
..peek
(_.astore register)))
(^ (synthesis.path/bit value))
(operation@wrap (.let [jump (.if value _.ifeq _.ifne)]
($_ _.compose
..peek
(//value.unwrap type.boolean)
(jump @else))))
(^ (synthesis.path/i64 value))
(operation@wrap ($_ _.compose
..peek
(//value.unwrap type.long)
(..long value)
_.lcmp
(_.ifne @else)))
(^ (synthesis.path/f64 value))
(operation@wrap ($_ _.compose
..peek
(//value.unwrap type.double)
(..double value)
_.dcmpl
(_.ifne @else)))
(^ (synthesis.path/text value))
(operation@wrap ($_ _.compose
..peek
(_.string value)
(_.invokevirtual //type.text ..equals-name ..equals-type)
(_.ifeq @else)))
(#synthesis.Then bodyS)
(do phase.monad
[bodyG (phase bodyS)]
(wrap ($_ _.compose
(..pop-alt stack-depth)
bodyG
(_.goto @end))))
(^template [<pattern> <flag> <prepare>]
(^ (<pattern> idx))
(operation@wrap
(do _.monad
[@success _.new-label
@fail _.new-label]
($_ _.compose
..peek
(_.checkcast //type.variant)
(..int (<prepare> idx))
<flag>
//runtime.case
_.dup
(_.ifnull @fail)
(_.goto @success)
(_.set-label @fail)
_.pop
(_.goto @else)
(_.set-label @success)
//runtime.push))))
([synthesis.side/left //runtime.left-flag function.identity]
[synthesis.side/right //runtime.right-flag .inc])
(^ (synthesis.member/left lefts))
(operation@wrap (.let [optimized-projection (.case lefts
0
_.aaload
lefts
//runtime.left-projection)]
($_ _.compose
..peek
(_.checkcast //type.tuple)
(..int lefts)
optimized-projection
//runtime.push)))
(^ (synthesis.member/right lefts))
(operation@wrap ($_ _.compose
..peek
(_.checkcast //type.tuple)
(..int lefts)
//runtime.right-projection
//runtime.push))
## Extra optimization
(^ (synthesis.path/seq
(synthesis.member/left 0)
(synthesis.!bind-top register thenP)))
(do phase.monad
[thenG (path' phase stack-depth @else @end thenP)]
(wrap ($_ _.compose
..peek
(_.checkcast //type.tuple)
_.iconst-0
_.aaload
(_.astore register)
thenG)))
## Extra optimization
(^template [<pm> <projection>]
(^ (synthesis.path/seq
(<pm> lefts)
(synthesis.!bind-top register thenP)))
(do phase.monad
[then! (path' phase stack-depth @else @end thenP)]
(wrap ($_ _.compose
..peek
(_.checkcast //type.tuple)
(..int lefts)
<projection>
(_.astore register)
then!))))
([synthesis.member/left //runtime.left-projection]
[synthesis.member/right //runtime.right-projection])
(#synthesis.Alt leftP rightP)
(do phase.monad
[@alt-else //runtime.forge-label
left! (path' phase (inc stack-depth) @alt-else @end leftP)
right! (path' phase stack-depth @else @end rightP)]
(wrap ($_ _.compose
_.dup
left!
(_.set-label @alt-else)
_.pop
right!)))
(#synthesis.Seq leftP rightP)
(do phase.monad
[left! (path' phase stack-depth @else @end leftP)
right! (path' phase stack-depth @else @end rightP)]
(wrap ($_ _.compose
left!
right!)))
))
(def: (path phase path @end)
(-> Phase Path Label (Operation (Bytecode Any)))
(do phase.monad
[@else //runtime.forge-label
pathG (..path' phase 1 @else @end path)]
(wrap ($_ _.compose
pathG
(_.set-label @else)
_.pop
//runtime.pm-failure
_.aconst-null
(_.goto @end)))))
(def: #export (if phase conditionS thenS elseS)
(-> Phase Synthesis Synthesis Synthesis (Operation (Bytecode Any)))
(do phase.monad
[conditionG (phase conditionS)
thenG (phase thenS)
elseG (phase elseS)]
(wrap (do _.monad
[@else _.new-label
@end _.new-label]
($_ _.compose
conditionG
(//value.unwrap type.boolean)
(_.ifeq @else)
thenG
(_.goto @end)
(_.set-label @else)
elseG
(_.set-label @end))))))
(def: #export (let phase inputS register bodyS)
(-> Phase Synthesis Register Synthesis (Operation (Bytecode Any)))
(do phase.monad
[inputG (phase inputS)
bodyG (phase bodyS)]
(wrap ($_ _.compose
inputG
(_.astore register)
bodyG))))
(def: #export (case phase valueS path)
(-> Phase Synthesis Path (Operation (Bytecode Any)))
(do phase.monad
[@end //runtime.forge-label
valueG (phase valueS)
pathG (..path phase path @end)]
(wrap ($_ _.compose
_.aconst-null
valueG
//runtime.push
pathG
(_.set-label @end)))))
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