Kotlin/NativeのNew Memory Managerに移行しよう | Kotlin Fest 2022

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,PUMJO.VMUJQMBUGPSN.PCJMF#FUB

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4FQUFNCFS .BZ

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8IZ/FX.FNPSZ.BOBHFS/FFEFE

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,PUMJO.VMUJQMBUGPSNͷڧΈ͸ʁ ɾฒߦॲཧͷ࣮૷ʹؔͯ͠ɺ,PUMJO/BUJWFಛ༗ͷ͓࡞๏͕ඞཁ ɾLPUMJOYDPSPVUJOFTͰϝϞϦϦʔΫ͕ൃੜ͢Δ͜ͱ͕͋Δ چ.FNPSZ.BOBHFSʹΑΔ੍໿ͱ՝୊ ,PUMJO/BUJWFΛߟྀ࣮ͨ͠૷ɾ։ൃऀମݧ͕ѱ͍ ˠ,PUMJO.VMUJQMBUGPSNͷීٴΛ๦͛Δͱ൑அ 8IZ/FX.FNPSZ.BOBHFS/FFEFE

$PODVSSFODZPO0ME.FNPSZ.BOBHFS

$PODVSSFODZPO0ME.FNPSZ.BOBHFS ,PUMJO/BUJWFͷϚϧνεϨουॲཧʹ͓͚Δϧʔϧ Մมͳঢ়ଶγϯάϧεϨου ෆมͳঢ়ଶϚϧνεϨου

$PODVSSFODZPO0ME.FNPSZ.BOBHFS ɾঢ়ଶ͕ՄมͰ͋Δ৔߹͸ෳ਺εϨου͔Βࢀরɾૢ࡞Ͱ͖ͳ͍ ɾ6*ͷߋ৽͕ϝΠϯεϨουҎ֎͔Βߦ͑ͳ੍͍໿ʹࣅ͍ͯΔ Մมͳঢ়ଶγϯάϧεϨου

$PODVSSFODZPO0ME.FNPSZ.BOBHFS ෆมͳঢ়ଶϚϧνεϨου ɾঢ়ଶ͕ෆมͰ͋Ε͹ෳ਺εϨου͔Βࢀরɾૢ࡞Ͱ͖Δ ɾෆมWBM ෆมGSP[FOTUBUF

ɾ,PUMJO/BUJWFͰ͸ϥϯλΠϜͰՄมɾෆมΛධՁ͢Δඞཁ͕͋Δ   ˠϥϯλΠϜͰෆมͰ͋Δ͜ͱΛࣔ͢GSP[FOTUBUF͕ඞཁʹͳΔ ɾ,PUMJO/BUJWFʹ͓͍ͯ͸ɺ͍͔ͳΔΦϒδΣΫτ΋GSFF[FՄೳ data class SomeData(val s: String, val
i: Int) // i is stable data class SomeData(val s: String, val i: SomeInterface) // i is unstable $PODVSSFODZPO0ME.FNPSZ.BOBHFS

'SP[FOTUBUFͷಛ௃ ɾঢ়ଶΛม͑Δ͜ͱ͕Ͱ͖ͳ͍ ɾঢ়ଶΛม͑Α͏ͱ͢Δͱ*OWBMJE.VUBCJMJUZ&YDFQUJPO͕ൃੜ͢Δ ɾ'SP[FOTUBUFͷ఻೻ ɾΦϒδΣΫτΛGSFF[F͢ΔͱɺࢠͷΦϒδΣΫτ΋࠶ىతʹGSFF[F $PODVSSFODZPO0ME.FNPSZ.BOBHFS

data class MoreData(val strData: String, var width: Float) data class
SomeData(val moreData: MoreData, var count: Int) //... val sd = SomeData(MoreData("abc", 10.0), 0) sd.freeze() $PODVSSFODZPO0ME.FNPSZ.BOBHFS

GSFF[F ؔ਺ ɾ,PUMJO/BUJWFͷGSFF[F ؔ਺ʹΑͬͯɺΦϒδΣΫτΛGSFF[FͰ͖Δ ɾ೚ҙͷΦϒδΣΫτʹରͯ͠GSFF[F ͨ࣌͠఺ͰɺͦͷΦϒδΣΫτ͕ ࢀর͍ͯ͠ΔΦϒδΣΫτ΋࠶ىతʹGSFF[F͞ΕΔ ɾGSFF[F ͸ෆՄٯૢ࡞ͳͷͰɺVOGSFF[Fͤ͞Δ͜ͱ͸Ͱ͖ͳ͍ $PODVSSFODZPO0ME.FNPSZ.BOBHFS

άϩʔόϧΦϒδΣΫτ ɾGSFF[F Λݺ͹ͳͯ͘΋GSFF[F͞ΕΔ ɾ͍͔ͳΔεϨου͔Β΋ΞΫηεͰ͖Δ͕ෆมͰͳ͍ͱ͍͚ͳ͍ $PODVSSFODZPO0ME.FNPSZ.BOBHFS object SomeState { var count
= 0 fun add() { count++ //This will throw an exception } }

άϩʔόϧΦϒδΣΫτ ɾ!5ISFBE-PDBMΛ࢖͏͜ͱͰෳ਺εϨουͰͷૢ࡞͕Մೳ ɾεϨου͝ͱʹ஋Λίϐʔ͢ΔͨΊεϨου͝ͱʹ஋͕ҟͳΔՄೳੑ $PODVSSFODZPO0ME.FNPSZ.BOBHFS @ThreadLocal object SomeState{ var count =
0 fun add(){ count++ //👍 } }

άϩʔόϧϓϩύςΟ ɾWBSͰఆٛͰ͖Δ͕ɺϝΠϯεϨου͔ΒͷΈࢀরɾૢ࡞͕Մೳ $PODVSSFODZPO0ME.FNPSZ.BOBHFS @SharedImmutable ϝΠϯεϨουҎ֎͔Β΋ࢀরͰ͖Δ͕GSFF[F͞ΕΔ @ThreadLocal εϨου͝ͱʹ஋ͷίϐʔΛ࡞੒͢ΔͨΊɺෳ਺εϨ ουͰͷࢀরɾૢ࡞͕Մೳ

εϨουηʔϑΛ࣮ݱ͢ΔͨΊʹ $PODVSSFODZPO0ME.FNPSZ.BOBHFS "UPNJDT 5ISFBEJTPMBUFE4UBUF

$PODVSSFODZPO0ME.FNPSZ.BOBHFS "UPNJDT ɾ,PUMJO/BUJWFͰ͸ɺ஋ͷมߋ͕Մೳͳ͕ΒGSFF[FͰ͖Δੑ࣭Λ࣋ͬͨ "UPNJD9YYΫϥεΛఏڙ͍ͯ͠Δ ɾ"UPNJD3FGFSFODF͸ɺϦετͷૢ࡞ͱ͍ͬͨಛఆεϨουͰίετ͔ ͔Δૢ࡞Λߦ͏৔߹ʹεϨουηʔϑʹͳΒͳ͍Մೳੑ͕͋Δ

$PODVSSFODZPO0ME.FNPSZ.BOBHFS 5ISFBEJTPMBUFE4UBUF ɾՄมͳঢ়ଶΛಛఆͷεϨουʹด͡ࠐΊɺผεϨου͔Βͦͷঢ়ଶʹ ରͯ͠΍ΓͱΓΛߦ͏ ɾҟͳΔεϨουͷ΍ΓͱΓΛಉ͡XPSLRVFVF্Ͱߦ͏͜ͱͰɺεϨ ουηʔϑΛ࣮ݱ

"UPNJD3FGFSFODFWT5ISFBEJTPMBUFE4UBUF $PODVSSFODZPO0ME.FNPSZ.BOBHFS ɾγϯϓϧͳ஋΍খ͍͞ΦϒδΣΫτ͸"UPNJD3FGFSFODF͕؆ܿͰѻ͍ ΍͍͢ ɾ஋ͷૢ࡞ʹίετ͕͔͔Δ৔߹΍ϦετͰ͸ɺSBDFDPOEJUJPOΛ๷͙ ͨΊʹ5ISFBEJTPMBUFE4UBUFΛར༻͢Δ

$PODVSSFODZPO0ME.FNPSZ.BOBHFS ɾOBUJWFNUϒϥϯνͰ੍໿ʹରԠ࣮ͨ͠૷͕։ൃ͞Ε͍ͯΔ ɾGSFF[Fޙ΋஋ͷมߋ͕Մೳͳ"UPNJD9YYͷ࣮૷Λར༻ LPUMJOYDPSPVUJOFT "UPNJDΫϥεͷࢀরΛ௥੻Ͱ͖ͣɺϝϞϦϦʔΫ͢Δέʔε͕ଘࡏ

IUUQTLPUMJOMBOHPSHEPDTOBUJWFJNNVUBCJMJUZIUNM

(BSCBHF$PMMFDUPS"MHPSJUIN

(BSCBHF$PMMFDUPS"MHPSJUIN 3FGFSFODFDPVOUJOH($ ɾΦϒδΣΫτʹࢀর਺ ϙΠϯλͷ਺ Λ෇ਵ͢Δ ɾࢀর਺ʹͳͬͨΦϒδΣΫτΛճऩ͢Δ

SPPU 3FGFSFODFDPVOUJOH($ (BSCBHF$PMMFDUPS"MHPSJUIN

SPPU ౸ୡෆೳˠϝϞϦϦʔΫ 3FGFSFODFDPVOUJOH($ (BSCBHF$PMMFDUPS"MHPSJUIN

5SBDJOH 5SBWFSTJOH ($ ɾϧʔτ͔ΒϙΠϯλΛͨͲΓɺ౸ୡՄೳͳΦϒδΣΫτΛൃݟ ɾ౸ୡͰ͖ͳ͍ΦϒδΣΫτΛճऩ ɾ͞Βʹ͍͔ͭ͘छྨ͕͋Δ .BSL4XFFQ($ $PQZ($ (BSCBHF$PMMFDUPS"MHPSJUIN

SPPU 5SBDJOH 5SBWFSTJOH ($ (BSCBHF$PMMFDUPS"MHPSJUIN

3FGFSFODFDPVOUJOHWT5SBDJOH 5SBDJOH 5SBWFSTJOH ($ 3FGFSFODFDPVOUJOH($ ɾ࣮૷͕༰қͰγϯϓϧ ɾࢀর਺ͷมߋΛτϦΨʔʹͰ͖Δ ɾϝϞϦϦʔΫ͕ى͖΍͍͢ ɾ࣮૷͕೉͍͠ ɾޮ཰తʹ($Λ૸ΒͤΔ͜ͱ͕೉͍͠
ɾϝϞϦϦʔΫΛ๷͗΍͍͢

.FNPSZ.BOBHFS"QQSPBDI

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/FX.FNPSZ.BOBHFS"QQSPBDI ɾ3FGFSFODFDPVOUJOHΑΓ΋ॊೈͰνϡʔχϯά͠΍͍͢ ɾϚϧνεϨουΞϓϦέʔγϣϯʹ͓͚Δཁ݅ʹϑΟοτ͠΍͍͢ ɾϥϯλΠϜͱίϯύΠϥͷ࣮૷͕ඇৗʹ೉͍͠ͷ͕ܽ఺ ɾ͞·͟·ͳΞϧΰϦζϜ΍ͦͷ૊Έ߹Θͤͷ($Λར༻Ͱ͖ΔΑ͏ʹ($Λઃܭ 5SBDJOH 5SBWFSTJOH ($

/FX.FNPSZ.BOBHFS7FSTJPOT

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ɾύϑΥʔϚϯεվળͱ҆ఆੑͷ޲্ ɾ($ͷTXFFQϑΣʔζΛฒߦ࣮ߦՄೳʹ ɾ/FX.FNPSZ.BOBHFS͕༗ޮͳࡍʹGSFF[F͕σϑΥϧτͰແޮʹ IUUQTZPVUSBDLKFUCSBJOTDPNJTTVF,51SPNPUFOFXNFNPSZNBOBHFSUP"MQIB "MQIB ,PUMJO /FX.FNPSZ.BOBHFS7FSTJPOT

ɾߋͳΔύϑΥʔϚϯεվળ ɾ($ͷεέδϡʔϥΛޮ཰ԽɺώʔϓαΠζΛεέʔϥϒϧʹ ɾσόοάϏϧυͷόΠφϦΛ࠷దԽ͠࠷େͰͷ࣮ߦ࣌ؒվળ ɾ/FX.FNPSZ.BOBHFS͕σϑΥϧτͰ༗ޮʹ IUUQTZPVUSBDLKFUCSBJOTDPNJTTVF,51SPNPUFOFXNFNPSZNBOBHFSUP#FUBBOEFOBCMFJUCZEFGBVMU #FUB ,PUMJO /FX.FNPSZ.BOBHFS7FSTJPOT

.JHSBUFUP/FX.FNPSZ.BOBHFS

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPCWLPUMJOOBUJWF/&8@..NE ,PUMJO.d kotlin.native.binary.memoryModel=experimental kotlin.targets.withType(KotlinNativeTarget::class.java) { binaries.all { binaryOptions["memoryModel"] =
"experimental" } } ɾ/FX.FNPSZ.BOBHFSΛ༗ޮʹ͢ΔͨΊʹͲͪΒ͔ͷઃఆ͕ඞཁ HSBEMFQSPQFSUJFT CVJMEHSBEMFLUT

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPCWLPUMJOOBUJWF/&8@..NE ɾOBUJWFNUͷόʔδϣϯΛ࢖Θͳ͍͍ͯ͘ LPUMJOYDPSPVUJOFT LUPS OFXNNFBQ ɾσϑΥϧτͷFOHJOFͩͱྫ֎͕ൃੜ͢ΔͷͰɺ*PT͔ͦͷଞͷFOHJOFΛ࢖͏ ,PUMJO.d

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPCWLPUMJOOBUJWF/&8@..NE ɾγϯάϧεϨου͔ͭTUPQUIFXPSMEͷNBSLTXFFQΞϧΰϦζϜΛ ࠾༻͍ͯ͠ΔͨΊɺύϑΥʔϚϯεʹӨڹ͕ग़Δ ɾίϯύΠϥΩϟογϡ͕αϙʔτ͞Εͯͳ͍ͨΊɺEFCVHόΠφϦͷί ϯύΠϧʹ͕͔͔࣌ؒΔ ,PUMJO.d ஫ҙࣄ߲

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTLPUMJOMBOHPSHEPDTOBUJWFNJHSBUJPOHVJEFIUNM ɾ/FX.FNPSZ.BOBHFS͸σϑΥϧτͰ༗ޮ ɾ0ME.FNPSZ.BOBHFSΛ࢖͏͜ͱ΋Ͱ͖Δ͕ɺίϯύΠϥΩϟογϡ ͕ޮ͔ͳ͍ͷͰίϯύΠϧ͕࣌ؒ௕͘ͳΔͷͰ஫ҙ HSBEMFQSPQFSUJFT kotlin.native.binary.memoryModel=strict ,PUMJOd

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTLPUMJOMBOHPSHEPDTOBUJWFNJHSBUJPOHVJEFIUNM ɾGSFF[Fͤͣͱ΋͍͔ͳΔεϨου͔Β΋ΦϒδΣΫτͷ ࢀরɺૢ࡞͕Մೳ ɾ"UPNJD3FGFSFODFΛؚΜͩ॥؀ࢀরͰ͋ͬͯ΋   ϝϞϦϦʔΫ͠ͳ͘ͳͬͨ ɾάϩʔόϧม਺͸஗ԆॳظԽ͞ΕΔΑ͏ʹ   !&BHFS*OJUJBMJ[BUJPOͰ஗ԆॳظԽ͞Εͳ͍Α͏ʹͰ͖Δ
@SharedImmutable freeze() isFrozen ensureNeverFrozen() ,PUMJOd

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTLPUMJOMBOHPSHEPDTOBUJWFNJHSBUJPOHVJEFIUNM ɾಛʹϚΠάϨʔγϣϯ͸ෆཁ ɾ͔Β,PUMJOʹґଘ ɾ/FX.FNPSZ.BOBHFSʹؔ͢ΔϚΠάϨʔγϣϯ͸ෆཁ ,PUMJOd LPUMJOYDPSPVUJOFT d LUPS d

.JHSBUFUP/FX.FNPSZ.BOBHFS IUUQTLUPSJPEPDTNJHSBUJOHIUNM ,PUMJOd

/FX.FNPSZ.BOBHFS'FBUVSFT

/FX.FNPSZ.BOBHFS'FBUVSFT IUUQTLPUMJOMBOHPSHEPDTOBUJWFNFNPSZNBOBHFSIUN !4IBSFE*NNVUBCMFͷάϩʔόϧม਺͸GSFF[F͞Εͳ͍͕ɺ GSFF[F ΛݺͿͱGSFF[F͞ΕΔ kotlin.native.binary.freezing=disabled // explicitOnly kotlin.targets.withType(KotlinNativeTarget::class.java) {
binaries.all { binaryOptions["freezing"] = “disabled" // “explicitOnly” } } HSBEMFQSPQFSUJFT CVJMEHSBEMFLUT ґଘ͍ͯ͠ΔϥΠϒϥϦ͕GSFF[F͢Δέʔε ,PUMJO.d disabled explicitOnly GSFF[F ΛݺΜͰ΋Կ΋͠ͳ͍

IUUQTLPUMJOMBOHPSHEPDTOBUJWFNFNPSZNBOBHFSIUN ɾLPUMJOOBUJWFJOUFSOBM($DPMMFDU Ͱڧ੍తʹಈ࡞ͤ͞Δ͜ͱ͕Ͱ͖Δ ,PUMJOd ($Λ໌ࣔతʹૢ࡞͢Δ ($Λແޮʹ͢Δ ɾςετͳͲ($Λಈ͔ͨ͘͠ͳ͍৔߹͸(SBEMFͷϑϥά 9HDOPPQ Λઃఆ /FX.FNPSZ.BOBHFS'FBUVSFT

IUUQTHJUIVCDPNNJDSPTPGUNJNBMMPD ɾ.FNPSZ.BOBHFSͷύϑΥʔϚϯε͸ઈ͑ͣվળ͍ͯ͠ΔͷͰɺ,PUMJOͷό ʔδϣϯΛ্͛ͯվળ͢Δ͔֬ೝ͢Δ ɾͦΕͰ΋վળ͠ͳ͍έʔεͰ͸NJNBMMPDΛར༻ͯ͠ΈΔ HSBEMFQSPQFSUJFT ,PUMJO#FUBҎ߱ ύϑΥʔϚϯε͸͍͍͕৴པੑ͕௿Լ͢ΔՄೳੑ͋Γ kotlin.native.binary.mimallocUseCompaction=true (SBEMFͷίϯύϧΦϓγϣϯ
-Xallocator=std ,PUMJOd ($ͷύϑΥʔϚϯεΛௐࠪ͢Δ /FX.FNPSZ.BOBHFS'FBUVSFT

IUUQTLPUMJOMBOHPSHEPDTOBUJWFNFNPSZNBOBHFSIUN ɾ(SBEMFͷϑϥά 9SVOUJNFMPHTHDJOGP Ͱ($ͷϩάΛग़͢͜ͱ͕Ͱ͖Δ ɾύϑΥʔϚϯεௐࠪʹಛԽͨ͠ϩάͰ͸ͳ͍ ,PUMJOd ($ͷύϑΥʔϚϯεΛௐࠪ͢Δ /FX.FNPSZ.BOBHFS'FBUVSFT

IUUQTLPUMJOMBOHPSHEPDTOBUJWFJPTJOUFHSBUJPOIUNMTVQQPSUGPSCBDLHSPVOETUBUFBOEBQQFYUFOTJPOT ɾσϑΥϧτͰ͸ΞϓϦέʔγϣϯͷঢ়ଶʹґͬͯɺ.FNPSZ.BOBHFSͷৼΔ ෣͍͸มΘΒͳ͍ ɾසൟʹ($Λಈ͔ͨ͘͠ͳ͍έʔεͰɺϝϞϦ࢖༻ྔ͕ඇৗʹଟ͍͚࣌ͩ($͕ ಈ͘Α͏ʹͰ͖Δ HSBEMFQSPQFSUJFT kotlin.native.binary.appStateTracking=enabled ,PUMJOd J04ͷόοΫάϥ΢ϯυঢ়ଶͱ"QQ&YUFOTJPOTͱͷ࿈ܞ /FX.FNPSZ.BOBHFS'FBUVSFT

IUUQTLPUMJOMBOHPSHEPDTOBUJWFNFNPSZNBOBHFSIUNM

)BWFBOJDF,PUMJO

Kotlin/NativeのNew Memory Managerに移行しよう | Kotlin Fest 2022

Kotlin/NativeのNew Memory Managerに移行しよう | Kotlin Fest 2022

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