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࣮ߦ࣌ʹ͓͚Δ
+7.όΠτίʔυ
࠷దԽٕ๏
todesking@maverick
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୭
w !UPEFTLJOHGSPN.BWFSJDL
JOD
w 7JNͰ4DBMBΛॻ͍͍ͯΔ
w 8FCࠂܥͷࣄΛ͍ͯ͠·͕͢ɺओʹ1%'ͷϨ
ϯμϦϯάΤϯδϯͳͲΛ࡞͍ͬͯΔ
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͋Β͢͡
w 4DBMBߴͳநԽػೳΛ࣋ͭ
w நԽΦʔόϔουΛ͏
w ಛఆͷ݅Ͱɺ͜ͷΦʔόϔου͕க໋త
w ࣮ߦ࣌ʹόΠτίʔυॻ͖͑ͯ͘͢ΔͭΛ
ͭͬͨ͘
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$IBQUFS
4DBMBศར
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4DBMBͷ
͞·͟·ͳநԽػߏ
w Ϋϥε
w USBJUʹΑΔNJYJO
w VOBQQMZʹΑΔΧελϚΠζՄೳͳύλʔϯϚο
ν
w ܕΫϥε
w *NQMJDJUDPOWFSTJPO
w ϑΝʔετΫϥεͳؔ
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4DBMBͷಛੑ
w 001ͱ'1ͷػೳ͕͑Δ
w খ͞ͳ൚༻෦ΛΈ߹Θͤͯ࠶ར༻͢Δͷ͕༰қ
ʹ
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$IBQUFSಈػ
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4DBMB.BUTVSJ
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3FKFDUFE
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ͳͷͰ
͜͜Ͱ
ൃද͠·͢
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ϞδϡϥʔγϯηαΠβʔ
Photo by Nina Richards https://commons.wikimedia.org/wiki/File:Doepfer_A-100.jpg
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ԿΛ͍͔ͨ͠
w ϞδϡϥʔγϯηൃৼثɺϑΟϧλͳͲͷجຊత
ͳϞδϡʔϧΛଟΈ߹ΘͤͯԻΛ࡞Δγϯηα
Πβʔ
w 4DBMBͰϞδϡϥʔͳγϯηΛͭ͘Γ͍ͨ
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දݱ͍ͨ͠ཁૉ
7$0 7$'
-'0
+
z-1
Ϟδϡʔϧؒͷଓ
৴߸ॲཧͷ༰
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දݱ͍ͨ͠ཁૉ
w ͜ΕΒͷجຊཁૉͰදݱͰ͖
Δ
w ଓ
w
w ߹ྲྀ
w ϧʔϓ
w 4DBMBͰͲ͏ॻ͘
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"SSPX
w ܕΫϥεͷͻͱͭ
w 'VODUJPOBM3FBDUJWF1SPHSBNNJOHͰΑ͘
ΘΕͯΔ
https://wiki.haskell.org/Yampa
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"SSPXʹΑΔදݱ
+
z-1
val z_1 = init(0.0)
val plus = arr { case (a, b) => a + b }
val out =
in >>> (z_1 &&& id) >>> plus
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"SSPXʹΑΔදݱ
+
z-1
val z_1 = init(0.0)
val plus = arr { case (a, b) => a + b }
val out =
in >>> (z_1 &&& id) >>>
(plus *** (arr(_._1) >>> z_1)) >>> plus
+
z-1
(´ŋ_ŋ`)???
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"SSPXه๏
w 4DBMBʹ͓͍ͯɺϞφυGPS
DPNQSFIFOTJPOͰॻ͚Δ
w "SSPXγϯλΫεγϡΨʔͰॻ͖͍ͨ
w )BTLFMMʹ"SSPX༻ͷγϯλΫεγϡΨʔͰ
͋ΔQSPDه๏͕͋Δ
w 4DBMBͰΓ͍ͨʂΓ·ͨ͠ʂ
w HJUIVCUPEFTLJOHBSSPX@CVJMEFSTDBMB
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"SSPXʹΑΔදݱ
XJUITZOUBYTVHBS
+
z-1
val z_1 = init(0.0)
val plus = arr { case (a, b) => a + b }
val out =
for {
a <- z_1 -< in
b <- plus -< (in, a)
c <- z_1 -< a
d <- plus -< (b, c)
} yield d
+
z-1
ʋ(´ʔʆ)ϊಡΊΔಡΊΔ
a
b
c d
in
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"SSPX࠷ߴ
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͔͠͠ɺ
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"SSPXʹΑΔ
৴߸ॲཧͷ࣮
ؔ߹ͷଟ༻
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"SSPXʹΑΓ
ߏஙͨ͠
৴߸ॲཧϑϩʔͷྫ
w ؙ͍ͷ͕ؔɺ
ҹ͕߹
w ӈҎ্Λ
ΊͯΔͷ͕
جຊతͳϞ
δϡʔϧͷͻ
ͱͭɺ7$'
w Ϟδϡʔϧ;
ͨͭܨ͍ͩͩ
͚Ͱ͜Ε
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Φʔόʔϔου
w ओཁͳॲཧͱൺֱͯؔ͠߹ͱUVQMJOHͷ͕
େ
w ϦΞϧλΠϜͰԻग़ྗ͍ͨ͠ͷͰɺ͜ͷΦϒδΣ
ΫτάϥϑΛLճTFD΄ͲධՁ͢Δඞཁ͕͋
Δ
w ͍͘ΒϝϞϦ֬อؔݺͼग़͠ͷίετ͕͍ͱ
ݴͬͯɺͪΐͬͱ͜Ε
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நԽʹϦεΫ͕͋Δ
w ύϑΥʔϚϯεΦʔόϔου
w ଟ͘ͷ߹ɺ࣮༻্ʹͳΒͳ͍
w ʹͳΔ߹ɺϗοτεϙοτͷΈ࠷దԽ͢Ε
Α͍
w ͔͠͠ɺϗοτεϙοτ͕දݱ͍ͨ͠υϝΠϯͦͷ
ͷͩͬͨ߹ʁ
w நԽΛࣺͯͯϕλॻ͖͢Δ͔͠ͳ͍ͷ͔
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$IBQUFSΦʔό
ϔουͱରࡦ
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ؔ߹Ͱൃੜ͢Δ
Φʔόϔου
w ෆ༻ͳΠϯελϯεͷੜ #PYJOH5VQMJOH
w ෆ༻ͳϝιουݺͼग़͠
w ্هʹΑΔɺ࠷దԽػձͷݮগ
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طଘͷ࠷దԽख๏
w 4DBMBίϯύΠϥ͕͓͜ͳ͏࠷దԽ
w +7.ͷ+*5ίϯύΠϥʹΑΔ࠷దԽ
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#PYJOH5VQMJOH
w (FOFSJDͳؔͷҾ࣮࣭0CKFDU
w ϓϦϛςΟϒܕΛ͍ͨ͠߹#PYJOHൃੜ
• Integer.valueOf(n)
w ෳͷΛฦ͍ͨ͠߹5VQMFΛ࡞Δඞཁ͕͋
Δ
w ϝϞϦ֬อͷίετɺ($ͷίετ͕ൃੜ
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4DBMBίϯύΠϥʹΑΔ
࠷దԽ
w ಛघԽ
w ܕύϥϝʔλʹ@specializedΞϊςʔγϣϯΛ͚ͭΔ͜ͱͰࢦఆ
w ܕύϥϝʔλ͕ϓϦϛςΟϒܕͷ߹ʹରͯ͠ɺઐ༻ͷϝιουΛ
ੜ͢Δ͜ͱͰCPYJOHΛෆཁʹ
w Έ߹Θͤͷ͚ͩϝιουΫϥε͕૿͑Δͱ͍͏σϝϦοτ͋Γ
w Έ߹ΘͤΛݮΒ͢NJOJCPYJOHͱ͍͏ख๏͋Δ ͨͩ͠4DBMB
ຊՈʹೖͬͯͳ͠
trait Function1[
@specialized(scala.Int, scala.Long, scala.Float, scala.Double) -T1,
@specialized(scala.Unit, scala.Boolean, scala.Int, scala.Float, scala.Long, scala.Double) +R
] extends AnyRef { self =>
ྫ: scala.Function1ͷఆٛ
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4DBMBίϯύΠϥʹΑΔ
࠷దԽ
w &MJNJOBUFOPOFTDBQJOHCPYFT
UVQMFT
BOESFGT
w ίϯύΠϧ࣌ʹɺϝιουͰ͍݁ͯ͠Δ
CPYJOHUVQMJOHΛআڈ͢Δ
w ͰೖΔΒ͍͠Ͱ͢
w ϝιουΛ·͍ͨͩ࠷దԽͰͳ͍ͷͰɺޮՌ͔
ͳΓݶఆతͰͱ͍͏ؾ͕͠·͢
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+7.ʹΑΔ࠷దԽ
w ΤεέʔϓղੳʹΑΔΠϯελϯεੜআڈ
w Ұൠతʹ4DBMBSSFQMBDFNFOUͳͲͱ͍͏
Β͍͠
w ϝιου֎ʹ࿐ग़͍ͯ͠ͳ͍ΦϒδΣΫτΛΠϯ
ϥΠϯԽ
w ߴͳϝϞϦ֬อͱ($ॲཧ
w OFX($ͷίετΛۃݶ·ͰݮΒͤͲ͏ͱ͍
͏͜ͱͳ͍
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Ծؔݺͼग़͠
w SFDFJWFSͷΫϥεΛݩʹಈతʹݺͼઌΛม͑Δ
w ༧ଌࠔͳؒذޮ͕ѱ͍
w ԾͰͳͯ͘ɺؔݺͼग़͠ίετ͕͔͔Δ
w ϓϩάϥϜͷෳࡶԽ࠷దԽΛ્͢Δ
class A {
def foo: Int = 10
}
class B extends A {
def foo = 99
}
class X {
def bar(a: A) =
a.foo // 10? 99?
}
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4DBMBίϯύΠϥʹΑΔ
࠷దԽ
w !JOMJOF
w Ξϊςʔγϣϯ͕ࢦఆ͞Εͨϝιουͷݺͼग़͠
ΛίϯύΠϧ࣌ʹΠϯϥΠϯԽ
w ඌ࠶ؼ࠷దԽ!UBJMSFD
w ඌ࠶ؼݺͼग़͠Λϧʔϓʹల։
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+7.ʹΑΔ࠷దԽ
w *OMJOJOH
w Α͘ݺͼग़͞ΕΔখ͍͞ϝιουΛ࣮ߦ࣌ʹΠϯ
ϥΠϯల։͢Δ
w ݺͼग़͞ΕΔϝιουͷީิ͕ݶΒΕ͍ͯΔ߹ɺ
Ծؔݺͼग़͠ΛܕνΣοΫ ݺͼग़͠ʹม
w +*5ίϯύΠϥͷৄࡉʹؔ͢Δࢿྉ͍͠ͷͰɺ
ΘΓͱṖʹแ·Ε͍ͯ·͢ 0QFO+%,ͷίʔυΛ
͕ΜͬͯಡΊ͍͍ΜͰ͕͢ʜʜ
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$IBQUFSطଘͷ
࠷దԽे͔
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"SSPXͷओ
ؔ߹
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ؔ߹ͷ
ύϑΥʔϚϯεΛ
ଌఆͯ͠ΈΔ
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ؔ߹ͷ
ύϑΥʔϚϯε
w YTMPXFS
standardF ௨ৗͷؔ߹ 4515.900 ± 154.250
baseline ߹ͤͣݺͿ 21772.108 ± 154.944
val f1: Int => Int = { x => x + 1 }
val f2: Int => Double = { x => x + 10.0 }
val f3: Double => Int = { x => (x * 100).toInt }
val f4: Int => Double = { x => x + 1.5 }
val f5: Double => Double = { x => x * 0.01 }
val f6: Double => Double = { x => x - 200.0 }
val f7: Double => Int = { x => x.toInt }
val f8: Int => Int = { x => x + 10 }
!
val baseline = {
def F(x: Int) = f8(f7(f6(f5(f4(f3(f2(f1(x))))))))
x: Int => F(F(F(F(x))))
}
!
val standardF = {
def F = f1 andThen f2 andThen f3 andThen f4 andThen f5 andThen f6 andThen f7 andThen f8
F andThen F andThen F andThen F
}
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4DBMBʹ͓͚Δؔ߹
class Comopse[A, B, C](
f: Function1[A, B],
g: Function1[B, C]
) extends Function1[A, B] {
def apply(x: A) = g(f(a))
}
Compose
Function1 Compose
Function1
Compose
Function1 Compose
Function1 Function1
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ؔ߹
ಛघԽ͞Ε͍ͯͳ͍
• unspecialized(´ŋ_ŋ`)
w Έ߹ΘͤരൃΛݮΒͨ͢ΊͷஅͩͱࢥΘΕ·͢
@annotation.unspecialized
def andThen[A](g: R => A): T1 => A =
{ x => g(apply(x)) }
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Fun1[Int,(Int, Int)]
ಛघԽ͞Εͳ͍
w 'VODUJPOͷಛघԽɺҰ෦ͷΈ߹Θͤʹݶఆ
w ҾɾฦΓͷҰ෦͕ࢀরܕͷέʔεɺಛघԽͷରʹ
ͳΒͳ͍
w Ϋϥεɾϝιουͷ૿ՃͱύϑΥʔϚϯε্Λఱṝʹ
͔͚ͨ݁ՌͩͱࢥΘΕΔ
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+*5ίϯύΠϥʹΑΔ
JOMJOJOHແཧ
w 'VODUJPOͷαϒΫϥεେྔʹଘࡏ
w ͭ·Γɺݺͼग़͞ΕΔՄೳੑͷ͋ΔԾؔͷީิ
͕େྔʹ͋Δ
w ࠷దԽ્͕͞Ε͍ͯΔ͓ͦΕ
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+*5ίϯύΠϥ
#PYJOHΛಛʹέΞͯ͠ͳ͍
w ˞ࢿྉ͕͍͠ͷͰਪଌͰ͢
w JOMJOJOH͕ޭ͢Ε ͯ͠ͳ͍
ɺΤεέʔϓղੳ
ͰআڈͰ͖Δ͕ʜʜ
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ίϯύΠϧ࣌ͷ
࠷దԽ
ݶք͕͋Δ
w ϥΠϒϥϦಈతʹϦϯΫ͞ΕΔͷͰɺΫϥεΛ
͑ͨ࠷దԽඇৗʹ͍͠
w ಛघԽɺࣄલʹͯ͢ͷϓϦϛςΟϒܕͷΈ߹
ΘͤΛ४උ͢Δ͜ͱࠔˠޮՌ͕ݶఆ͞ΕΔ
w NJOJCPYJOHΈ͍ͨͳςΫ͋Δ͚Ͳඪ४ϥΠ
ϒϥϦʹಋೖ͞Εͯͳ͍ΜͰʜʜ
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+*5ίϯύΠϧʹ
ݶք͕͋Δ
w ಁաతʹಈ࡞͢Δඞཁ͕͋Δ
w ॲཧ࣌ؒͷ੍
w ͍͔ͳΔ߹ڍಈมߋͯ͠ͳΒͳ͍
w ͋ΒΏΔϓϩάϥϜʹରͯ͠ɺͦΕͳΓʹಈ͘ඞ
ཁ͕͋Δ
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$IBQUFS
!
खܰͳ࣮Ͱ
ؔ߹ͷߴԽ
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4DBMBίϯύΠϥʹ
+7.ʹແཧͳΒɺ
ࣗલͰ࠷దԽ͢Δ͔͠ͳ͍
w ॲཧ࣌ؒͷ੍ͳ͠
w ڍಈΛม͍͍͑ͯ
w ݶఆ͞ΕͨతͷͨΊͷ࠷దԽ͕Ͱ͖Δ
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࣮ߦϑΣʔζͷղ
w తͷΞϓϦέʔγϣϯɺΦϒδΣΫτάϥϑͷ
ߏஙˠ࣮ߦͱ͍͏ߏ
def main() = {
// ΦϒδΣΫτάϥϑͷߏங
val arrow: Long => Double =
buildArrow()
// ࣮ߦ
while(true) {
run(arrow)
}
}
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ΞϓϦέʔγϣϯಛੑʹ
جͮ͘࠷దԽ
w ΦϒδΣΫτάϥϑͷߏங࠷ॳ͚ͩ
w ͜ͷ෦ͷύϑΥʔϚϯεॏཁͰͳ͍
w ߏங͞Εͨάϥϑଟ࣮ߦ͞ΕΔ
w ͖ΘΊͯߴʹ࣮ߦ͍ͨ͠
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࠷దԽϑΣʔζͷಋೖ
def main() = {
// ΦϒδΣΫτάϥϑͷߏங
val arrow: Long => Double =
buildArrow()
// ࠷దԽ
val optimized = optimize(arrow)
// ࣮ߦ
while(true) {
run(optimized)
}
}
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खܰͳ࣮Ͱ
ߴԽͯ͠ΈΔ
w ؔ߹ΛΫϥεʹ·ͱΊɺಛघԽϝιουΛ
͏
w Ծϝιουݺͼग़͠ͱCPYJOH͕
w $PNQPTF/Έ͍ͨͳΫϥε࡞Εղܾ͢Δ
w ࣄલʹશύλʔϯੜݱ࣮తͰͳ͍ͷͰɺ࣮ߦ
࣌ʹΔ
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ΫϥεੜʹΑΔ࣮
w +BWBTTJTUϥΠϒϥϦͰ͜͏͍͏ΫϥεΛಈతʹ
࡞Δ
clas Compose5 extends Function1 {
val f1: Function1
val f2: Function1
// ...
def apply(a: Any) = apply$ID(a)
def apply$ID(a: Int): Double = {
f5$ID(f4$II(f3$DI(f2$ID(f1$II(a))))
}
// ...
}
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ΫϥεੜʹΑΔ࣮
w ίʔϧελοΫ͕ઙ͘ͳΔ
w ϝιουݺͼग़͠ίετͷݮ
w +*5ίϯύΠϥͷ༏͠͞
w CPYJOHͷআڈ
w ͕ظͰ͖Δ
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MethodHandleʹΑΔ࣮
w MethodHandle +7.ʹ͓͚ΔؔϙΠϯλ
w +7.͕ಛผѻ͍ͯ͘͠ΕΔͷͰ࠷దԽͷΦϙνϡ
χςΟ͕͓͓͖͍
w +7.༷Ͱϝιουݺͼग़࣌͠ͷಛผѻ͍͕໌
ݴ͞ΕͯΔ
w .)ͷ߹αϙʔτ͍ͯ͠Δ
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MethodHandle API
w MethodHandles.identity(klass)߃ؔ
w MethodHandles.lookup().findVirtual(klass,
name, type).bind(obj):ಛఆͷΠϯελϯεͷ
ԾؔΛද͢.)ΛಘΔ
w MethodHandles.filterReturnValue(mh1, mh2)
.)ͷฦΓʹผͷ.)Λద༻
w ͜ΕΒΛ͑ؔ߹͕දݱՄೳ
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ϕϯνϚʔΫ݁Ռ
w ͪΐͬͱ͘ͳΓ·ͨ͠Ͷ
w .FUIPE)BOEMF͑Ϋϥεੜͳ͠ͰΦʔό
ϔουݮͰ͖ΔͷͰ͓ಘ
w ͔͠͠CBTFMJOF·Ͱԕ͍
standard ௨ৗͷؔ߹ 4515.900 ± 154.250
fast ߹Ϋϥεͷੜ 5499.803 ± 183.904
fastMH MethodHandleʹΑΔ߹ 5476.340 ± 45.937
baseline ߹ͤͣݺͿ 21772.108 ± 154.944
୯Ґ: k ops/sec
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ίʔυެ։ͯ͠·͢
w IUUQTHJUIVCDPNUPEFTLJOH
GBTU@GVODUJPO@DPNQPTFSTDBMB
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$IBQUFS
!
൚༻ੑͷ͋Δ
࣮ߦ࣌
όΠτίʔυ࠷దԽ
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ߟ͑ํ
w ϑΟʔϧυΛ༥߹ͤͯ͞Ծؔݺͼग़͠Λݮ
w ϑΟʔϧυͰϝιουͷΠϯϥΠϯԽ
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ϑΟʔϧυͷ༥߹
w Ծؔݺͼग़͠Λ࣮ؔݺͼग़͠ʹมͰ͖Δ
w +*5ίϯύΠϧͰͷ࠷దԽ͖͖͘͢ͳΔ͔
class A(b: B) {
def foo = b.bar + 1
}
class B(c: C) {
def bar = 99 + c.baz
}
class C {
def baz = 111
}
class A_opt(b: B) extends A{
def foo = b_bar + 1
def b_bar = 99 + b_c_baz
def b_c_baz = 111
}
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ϝιουͷΠϯϥΠϯԽ
w ϑΟʔϧυ༥߹ޙɺಉҰΠϯελϯεͰͷϝιο
υΠϯϥΠϯԽΛߦ͏
class A_opt(b: B) extends A{
def foo = b_bar + 1
def b_bar = 99 + b_c_baz
def b_c_baz = 111
}
class A_opt2(b: B) extends A{
def foo =
99 + 111 + 1
}
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ϕϯν݁Ռ
w ر͕ݟ͖͑ͯ·ͨ͠Ͷ
w ؔݺͼग़͠ίετͷపఈͨ͠ݮͱɺ+*5ίϯύΠϧʹΑΔ
࠷దԽ͕ޮ͖͍͢ܗࣜʹͳͬͨ͜ͱ͕ʹͭͳ͕ͬͨͱݟ
͍ͯ·͢
w CBTFMJOFͱͷࠩɺCPYJOH͕ফͤͯͳ͍ͷ͕ؔͯͦ͠͏
standard ௨ৗͷؔ߹ 4640.914 ± 77.983
fused Field fusionద༻ 7187.380 ± 321.257
fuseInlined Field Fusion + Method Inlining 12924.076 ± 207.785
baseline ߹ͤͣݺͿ 21841.596 ± 223.906
୯Ґ: k ops/sec
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൚༻ੑ͕͋Δ
w ؔ߹ʹݶఆ͞Εͳ͍ɺ൚༻తͳΦϒδΣΫτά
ϥϑͷ࠷దԽ͕ՄೳͱͳΔ
w ͔͍͍ͬ͜͠ɺ࣮༻ੑ͕͋Δ<ཁग़య>
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࣮ͷৄࡉ
w ΫϥεϑΝΠϧૢ࡞ʹ+BWBTTJTUΛ༻
w όΠτίʔυղੳͳͲαϙʔτ͕ͳ͍ͷͰࣗલ
Ͱͬͯ·͢
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࣮ͷৄࡉ
'JFMEGVTJPO
w ༻͞Ε͍ͯΔϝιουͷಛఆ
w ͦΕΒͷϝιου͕ґଘ͍ͯ͠Δϝιουͷಛఆ
w ͦΕΒͷϝιου͕༻͍ͯ͠ΔϑΟʔϧυΛ߹
w ϝιουࢀরͷॻ͖͑
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όΠτίʔυղੳ
w UIJTʹର͢Δૢ࡞Λॻ͖͍͑ͨ
w ಛఆͷϑΟʔϧυʹର͢Δؔݺͼग़͠Λॻ͖͑
͍ͨ
w ͳͲͷधཁ͕͋ΓɺόΠτίʔυΛղੳͯͦ͠ΕΒ
ͷใΛಘΔඞཁ͕͋Γ·͢
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#ZUFDPEF
w +7.ελοΫϚγϯ
w ϝιουϩʔΧϧͷελοΫͱϩʔΧϧมʹ
อଘ͞ΕΔ
w ʹܕ͕͋Δ
w Ϋϥε༻࣌ʹܕ͕߹͍ͬͯΔ͔+7.͕ݕূ
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σʔλϑϩʔղੳ
w +7.4Ͱݴٴ͞ΕͯΔͭͱ͍͍͓ͩͨͳ͡Ͱ͢
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Ϋϥεͷมܗ͍͠
w ϝϯόʹΞΫηεݖ͕͋Δ
w QSJWBUFϑΟʔϧυΛࢀর͍ͯ͠ΔQVCMJDϝιο
υΛॻ͖͑ΔʹɺͦͷϑΟʔϧυҰॹʹ࣋ͬ
ͯ͘Δඞཁ͕͋Δ
w ύϑΥʔϚϯεతͳཧ༝͔ΒɺϦϑϨΫγϣϯ
͍·ͤΜ
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Ϋϥεੜ
w ϑΟʔϧυʹదͳΛηοτ͢Δඞཁ͕͋Δ
w ΫϥεͷpOBMϑΟʔϧυʹ
w ΫϥεͷίϯετϥΫλʹదͳΛ͞Ͷ
ͳΒͳ͍
w ͷίϯετϥΫλΛղੳͯ͠ҾͱϑΟʔϧυͷ
ؔΛϚοϐϯά͠ɺͦΕΛݩʹίϯετϥΫλ࣮
ͱҾΛٻΊΔ
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Ϋϥεੜ
ίϯετϥΫλղੳ
w $ͷαϒΫϥεΛఆ͍ٛͨ͠
w "Yͷ"ίϯετϥΫλͷୈҰҾ͕ΘΕΔ
w #Zͷ#ίϯετϥΫλͷୈҰҐҾ͕ΘΕΔ
w #ίϯετϥΫλ"
ΛݺͿ
w $ίϯετϥΫλͷҾͰ͋Δ͖
w ͱ͍͏͜ͱΛɺϑΟʔϧυͷͱ֤Ϋϥεఆ͔ٛΒٻΊΔ
class A(val x: Int)
class B(val y: Int) extends A(1)
class C(val x: Int) extends B(x)
!
optimize(new C(1))
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࣮ࡍͷมܗ
w ΦϒδΣΫτͷωετ͕ਂ͗ͯ͢ϑΟʔϧυ໊͕͍͢͜͝ͱʹ
w ΫϥεϑΝΠϧͷϝϯό੍ݶҾɺόΠτίʔυͷ੍ݶ
ͳͲߟྀ͠ͳ͍ͱ·ͣͦ͏ͳ༧ײ͕͠·͢
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ίʔυެ։ͯ͠·͢
w IUUQTHJUIVCDPNUPEFTLJOH6OWFJM
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$IBQUFS·ͱΊ
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·ͱΊ
w ࣮ߦ࣌ʹόΠτίʔυΛ࠷దԽͯ͠ΦʔόϔουΛ
ݮΒͨ͢Ίͷख๏Λఏࣔ͠·ͨ͠
w நԽΛอͪͳ͕Β࣮ߦ࣌ͷΛ্ͤ͞ΒΕΔ
ر͕ݟ͖͑ͯͨ
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ͲΜͳͱ͖ʹ༗ޮͳͷ
͔
w খ͞ͳΦϒδΣΫτ͕ଟ߹͞Ε͍ͯΔ
w ΦϒδΣΫτͷੜճ ࣮ߦճ
w ຊʹύϑΥʔϚϯεϨΠςϯγ͕ॏཁ
w நԽΛࣺͯͨ͘ͳ͍
w ৴߸ॲཧҎ֎ͩͱ
w ݴޠॲཧܥ
w Ҩతϓϩάϥϛϯά
w +BWBͷ1BUUFSOΫϥεʹద༻Ͱ͖Δ͔
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ࠓޙͷల
w ·ͩαϙʔτͯ͠ͳ͍ཁૉ͕ଟ͍
w OFXͱ͔ྫ֎ϋϯυϥͱ͔
w ΠϯλϑΣʔεͷσϑΥϧτ࣮*O%Z
w 4DBMBͰͬͯͳ͍͍͍͔͠ͱࢥͬͨΒɺ࠾༻
ͷಈ͖͕
w ҆શͳॻ͖͑ͷอো
w ͜ͷॻ͖͑Ͳ͏͍ͬͨ݅ͷͱͰ҆શͳͷ
͔ ͱ͍͏ͷΛ։ൃऀͷצʹཔ͍ͬͯΔ
w ܗࣜతख๏ɺಋೖ͍ͨ͠Ͱ͢Ͷʜʜ
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ؔ࿈ࢿྉ
w 4PPU
w όΠτίʔυղੳ࠷దԽϥΠϒϥϦͷฮ
w ͪ͜Β੩తͳมΛલఏͱ͍ͯ͠ΔΑ͏Ͱ͢
w 4USFBN+*5
w $PNNFOTBM$PNQJMFS֓೦
w .FUIPE)BOEMFͷݩωλ
w ੴ࡚Ұ໌ࢯͷ֤छࢿྉ
w +7.͕࠾༻͍ͯ͠Δ࠷దԽख๏ʹ͍ͭͯͷوॏͳࢿྉ
w લʹॻ͔ΕͨͷͰ͕͢ɺ+*5ίϯύΠϥͷॲཧʹͭ
͍ͯॻ͔Εͨࢿྉຊʹগͳ͍ͷͰوॏ
w (JPSHJE[F
(FPSHF.PEVMBS4ZOUIFTJ[FS1SPHSBNNJOHJO)BTLFMM%JTT.4D%JTTFSUBUJPO
%FQBSUNFOUPG$PNQVUFS4DJFODFBOE&OHJOFFSJOH
%JWJTJPOPG$PNQVUJOH4DJFODF
$IBMNFST
6OJWFSTJUZPG5FDIOPMPHZBOE5IF6OJWFSTJUZPG(PUIFOCVSH
(PUIFOCVSH
4XFEFO
w )BLFMM :BNQBͰϞδϡϥʔγϯη࡞Δ