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(.module:
[lux (#- if let case)
[abstract
[monad (#+ do)]]
[control
["." function]
["ex" exception (#+ exception:)]]
[data
[text
format]]
[target
[jvm
["$t" type]]]
[tool
[compiler
["." synthesis (#+ Path Synthesis)]
["." phase ("operation@." monad)]]]]
[luxc
[lang
[host
["$" jvm (#+ Label Inst Operation Phase)
["_" inst]]]]]
["." // (#+ $Object)
["." runtime]])
(def: (pop-altI stack-depth)
(-> Nat Inst)
(.case stack-depth
0 function.identity
1 _.POP
2 _.POP2
_ ## (n/> 2)
(|>> _.POP2
(pop-altI (n/- 2 stack-depth)))))
(def: peekI
Inst
(|>> _.DUP
runtime.peekI))
(def: pushI
Inst
(|>> (_.INVOKESTATIC //.runtime-class
"pm_push"
($t.method (list runtime.$Stack $Object)
(#.Some runtime.$Stack)
(list))
#0)))
(def: (path' phase stack-depth @else @end path)
(-> Phase Nat Label Label Path (Operation Inst))
(.case path
#synthesis.Pop
(operation@wrap runtime.popI)
(#synthesis.Bind register)
(operation@wrap (|>> peekI
(_.ASTORE register)))
(^ (synthesis.path/bit value))
(operation@wrap (.let [jumpI (.if value _.IFEQ _.IFNE)]
(|>> peekI
(_.unwrap #$t.Boolean)
(jumpI @else))))
(^ (synthesis.path/i64 value))
(operation@wrap (|>> peekI
(_.unwrap #$t.Long)
(_.long (.int value))
_.LCMP
(_.IFNE @else)))
(^ (synthesis.path/f64 value))
(operation@wrap (|>> peekI
(_.unwrap #$t.Double)
(_.double value)
_.DCMPL
(_.IFNE @else)))
(^ (synthesis.path/text value))
(operation@wrap (|>> peekI
(_.string value)
(_.INVOKEVIRTUAL "java.lang.Object"
"equals"
($t.method (list $Object)
(#.Some $t.boolean)
(list))
#0)
(_.IFEQ @else)))
(#synthesis.Then bodyS)
(do phase.monad
[bodyI (phase bodyS)]
(wrap (|>> (pop-altI stack-depth)
bodyI
(_.GOTO @end))))
(^template [<pattern> <flag> <prepare>]
(^ (<pattern> idx))
(operation@wrap (<| _.with-label (function (_ @success))
_.with-label (function (_ @fail))
(|>> peekI
(_.CHECKCAST ($t.descriptor runtime.$Variant))
(_.int (.int (<prepare> idx)))
<flag>
(_.INVOKESTATIC //.runtime-class "pm_variant"
($t.method (list runtime.$Variant runtime.$Tag runtime.$Flag)
(#.Some runtime.$Datum)
(list))
#0)
_.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 (.let [accessI (.case lefts
0
_.AALOAD
lefts
(_.INVOKESTATIC //.runtime-class
"tuple_left"
($t.method (list runtime.$Tuple $t.int)
(#.Some $Object)
(list))
#0))]
(|>> peekI
(_.CHECKCAST ($t.descriptor runtime.$Tuple))
(_.int (.int lefts))
accessI
pushI)))
(^ (synthesis.member/right lefts))
(operation@wrap (|>> peekI
(_.CHECKCAST ($t.descriptor runtime.$Tuple))
(_.int (.int lefts))
(_.INVOKESTATIC //.runtime-class
"tuple_right"
($t.method (list runtime.$Tuple $t.int)
(#.Some $Object)
(list))
#0)
pushI))
(#synthesis.Alt leftP rightP)
(do phase.monad
[@alt-else _.make-label
leftI (path' phase (inc stack-depth) @alt-else @end leftP)
rightI (path' phase stack-depth @else @end rightP)]
(wrap (|>> _.DUP
leftI
(_.label @alt-else)
_.POP
rightI)))
(#synthesis.Seq leftP rightP)
(do phase.monad
[leftI (path' phase stack-depth @else @end leftP)
rightI (path' phase stack-depth @else @end rightP)]
(wrap (|>> leftI
rightI)))
))
(def: (path phase path @end)
(-> Phase Path Label (Operation Inst))
(do phase.monad
[@else _.make-label
pathI (..path' phase 1 @else @end path)]
(wrap (|>> pathI
(_.label @else)
_.POP
(_.INVOKESTATIC //.runtime-class
"pm_fail"
($t.method (list) #.None (list))
#0)
_.NULL
(_.GOTO @end)))))
(def: #export (if phase testS thenS elseS)
(-> Phase Synthesis Synthesis Synthesis (Operation Inst))
(do phase.monad
[testI (phase testS)
thenI (phase thenS)
elseI (phase elseS)]
(wrap (<| _.with-label (function (_ @else))
_.with-label (function (_ @end))
(|>> testI
(_.unwrap #$t.Boolean)
(_.IFEQ @else)
thenI
(_.GOTO @end)
(_.label @else)
elseI
(_.label @end))))))
(def: #export (let phase inputS register exprS)
(-> Phase Synthesis Nat Synthesis (Operation Inst))
(do phase.monad
[inputI (phase inputS)
exprI (phase exprS)]
(wrap (|>> inputI
(_.ASTORE register)
exprI))))
(def: #export (case phase valueS path)
(-> Phase Synthesis Path (Operation Inst))
(do phase.monad
[@end _.make-label
valueI (phase valueS)
pathI (..path phase path @end)]
(wrap (|>> _.NULL
valueI
pushI
pathI
(_.label @end)))))
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