ARTのメモリ管理 - Speaker Deck

ARTのメモリ管理

by haru067

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"35ͷϝϞϦ؅ཧ %SPJE,BJHJ!IBSV

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ࣗݾ঺հ ˔ 5XJUUFSΫϥΠΞϯτ  4IPPUJOH4UBSͷ։ൃऀ !IBSV

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ࣗݾ঺հ ˔ 5XJUUFSΫϥΠΞϯτ  4IPPUJOH4UBSͷ։ൃऀ  ʢͨ·ʹ͸ਅ໘໨ͳ࿩Λʣ !IBSV

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"OESPJEͷ($ͷྺ࢙ Y %BMWJL7. "35

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"OESPJEͷ($ͷྺ࢙ 'SPZP ˔ ϚʔΫεΠʔϓ($ ˔ ($த͸ΞϓϦέʔγϣϯ͕ఀࢭͯ͠͠·͏  ʢ458ɼ4UPQ5IF8PSMEʣ Y %BMWJL7. "35

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"OESPJEͷ($ͷྺ࢙ (JOHFSCSFBE ˔ .PTUMZ$PODVSSFOU($ ˔ ϚʔΫεΠʔϓ($ΛΞϓϦέʔγϣϯͱ  ΄΅ฒߦʹ࣮ߦɽఀࢭ࣌ؒ͸େ͖͘վળ Y %BMWJL7. "35

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"OESPJEͷ($ͷྺ࢙ Y*$4 +FMMZ#FBO ˔ େ͖ͳมߋ͸ͳ͠ ˔ .PTUMZ$PODVSSFOU($  ʢฒߦϚʔΫεΠʔϓ($ʣ Y %BMWJL7. "35

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"OESPJEͷ($ͷྺ࢙ ,JULBU ˔ "35ͳΔϥϯλΠϜ͕ग़ݱ ˔ σϑΥϧτ͸·ͩ%BMWJL7. Y %BMWJL7. "35

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"OESPJEͷ($ͷྺ࢙ -PMMJQPQ ˔ "35͕σϑΥϧτʹɼ%BMWJL͸രൃ࢛ࢄ ˔ ϥϯλΠϜ͕ସΘͬͯ($ͱ͔৭ʑͱมΘͬͨ Y %BMWJL7. "35

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Կ͕มΘͬͨͷ͔ʁ

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ฒߦ($ͷఀࢭ࣌ؒ

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%BMWJL7. ˔ ϧʔτεΩϟϯͱ࠶ϚʔΫͰΞϓϦ͕ఀࢭ͢Δ "35 ˔ ϧʔτεΩϟϯͱ࠶ϚʔΫͷҰ෦Λฒߦʹॲཧ ͕͜͜มΘͬͨɿฒߦ($ͷఀࢭՕॴ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ

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%BMWJL7. ˔ ϧʔτεΩϟϯͱ࠶ϚʔΫͰΞϓϦ͕ఀࢭ͢Δ "35 ˔ ϧʔτεΩϟϯͱ࠶ϚʔΫͷҰ෦Λฒߦʹॲཧ ͕͜͜มΘͬͨɿฒߦ($ͷఀࢭՕॴ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ dϛϦඵ͙Β͍

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%BMWJL7. ˔ ϧʔτεΩϟϯͱ࠶ϚʔΫͰΞϓϦ͕ఀࢭ͢Δ "35 ˔ ϧʔτεΩϟϯͱ࠶ϚʔΫͷҰ෦Λฒߦʹॲཧ ͕͜͜มΘͬͨɿฒߦ($ͷఀࢭՕॴ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ ϛϦඵ͙Β͍

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"35ͷฒߦ($εΰΠʂ

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ฒߦ͡Όͳ͍΄͏͸ʁ ˔ 458($ ˔ MPHDBUʹग़ͯ͘Δ($@'03@"--0$͸͜Ε ˔ ϝϞϦྖҬ͕ෆ଍͢Δͱൃੜ ˔ ฏؾͰΞϓϦ͕਺ඵࢭ·ͬͨΓ͢Δ ൃੜ͢Δͱ໌Β͔ʹϠό͍

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ฒߦ͡Όͳ͍΄͏͸ʁ ˔ 458($ ˔ MPHDBUʹग़ͯ͘Δ($@'03@"--0$͸͜Ε ˔ ϝϞϦྖҬ͕ෆ଍͢Δͱൃੜ ˔ ฏؾͰΞϓϦ͕਺ඵࢭ·ͬͨΓ͢Δ ൃੜ͢Δͱ໌Β͔ʹϠό͍

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ϩάݟΔͱׂͱൃੜͯͨ͠Γ͢Δ

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ʀʅЧʆ

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458($ͷൃੜݪҼͦͷ̍ ˔ அยԽʹΑΔϝϞϦׂ౰ͯͷࣦഊ  ʮۭ͍ͯΔͱ͜Ζ͸νϥϗϥ͋Δ͚ͲೖΒͳ͍ʯ ˔ ΞϓϦέʔγϣϯ͸͝ΈͷճऩΛ଴ͨͳ͍ͱ͍ ͚ͳ͍ ώʔϓ ۭ͖ྖҬ ࢖༻த PCK ʁ

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σϑϥά͢Ε͹͍͍͡ΌΜ ˔ σϑϥάʹ͸ੌ͍͕͔͔࣌ؒΔ ˔ ώʔϓΛԿ౓΋εΩϟϯ͢Δඞཁ͕͋Δ ˔ σϑϥά͍ͯ͠ΔؒΞϓϦέʔγϣϯ͕ఀࢭ ˔ ͱͯ΋ͭΒ͍

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"35͸Ͳ͏ͯ͠Δͷ ˔ େ͖͍ΦϒδΣΫτ͕ॾѱͷࠜݯ ώʔϓ ۭ͖ྖҬ ࢖༻த PCK

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"35͸Ͳ͏ͯ͠Δͷ ˔ େ͖͍ΦϒδΣΫτ͕ॾѱͷࠜݯ  ʮσϒ͸ిंʹ৐Δͳʯ ώʔϓ ۭ͖ྖҬ ࢖༻த PCK

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͕͜͜มΘͬͨɿஅยԽରࡦ ˔ େ͖͍ΦϒδΣΫτΛผͷྖҬͰ؅ཧ  ʮσϒઐ༻ं྆Λͭ͘Ζ͏ʯ ˔ -BSHF0CKFDU4QBDFʢ-04ʣ ௨ৗ༻ ۭ͖ྖҬ ࢖༻த Ͱ͔͍΍ͭΒʢେ͖Ίͷ഑ྻͱ͔ʣ༻

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"35͕Μ͹ͬͯΔ

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ΞϓϦ࣮ߦ

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ฒߦ($ ΞϓϦ࣮ߦ

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ฒߦ($ ΞϓϦ࣮ߦ ΞϓϦ࣮ߦ

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ฒߦ($ ΞϓϦ࣮ߦ ΞϓϦ࣮ߦ ฒߦ($

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ฒߦ($ ΞϓϦ࣮ߦ ΞϓϦ࣮ߦ ฒߦ($ ϝϞϦਚ͖·ͨ͠

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ฒߦ($ ΞϓϦ࣮ߦ ΞϓϦ࣮ߦ ฒߦ($ ϝϞϦਚ͖·ͨ͠ 458($

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458($ͷൃੜݪҼͦͷ̎ ˔ ϝϞϦׂ౰͕ܹͯͯ͘͠ฒߦ($͕௥͍͔ͭͳ͍ ฒߦ($ ΞϓϦ࣮ߦ ΞϓϦ࣮ߦ ฒߦ($ ϝϞϦਚ͖·ͨ͠ 458($

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ฒߦ($ૣΊʹ΍Ε͹͍͍͡ΌΜ ˔ ͍͍ͩͨ͋ͬͯΔ ˔ "35͸%BMWJLΑΓݡ͘ฒߦ($Λ࣮ߦͯ͠Δ ˔ جຊతʹ͸ۭ͖ྖҬ͕Ұఆ஋Λ௒͑ͨΒ($ ˔ "35͸ϝϞϦׂ౰ͯස౓ͱ͔΋ߟྀͭͭ͠($

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"35͕Μ͹ͬͯΔ

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"35ͷఀࢭ࣌ؒ·ͱΊ ˔ ฒߦ($ͰɼΞϓϦΛఀࢭ্ͤͨ͞ͰͷॲཧΛ࡟ݮ ˔ 458($ͷൃੜස౓Λ཈͑Δ޻෉ ˔ -BSHF0CKFDU4QBDFʹΑΔஅยԽରࡦ ˔ ΑΓ͜·໨ʹɼલ΋ͬͯฒߦ($ ฏۉఀࢭ࣌ؒΛ୹͘ ௕࣌ؒͷఀࢭΛ཈͑Δ

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ΊͰͨ͠ʁ

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˔ 458($ͷൃੜ͸཈͑ΒΕΔ ˔ εϧʔϓοτʢ࣮ߦ࣌ؒʣ͸ѱ͘ͳΔ Ή΍Έʹฒߦ($Λ࣮ߦ͍͍ͯ͠ͷ͔ʁ

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˔ 458($ͷൃੜ͸཈͑ΒΕΔ ˔ εϧʔϓοτʢ࣮ߦ࣌ؒʣ͸ѱ͘ͳΔ Ή΍Έʹฒߦ($Λ࣮ߦ͍͍ͯ͠ͷ͔ʁ ࣮ߦ࣌ؒ͸ͬͪ͜ͷ΄͏͕୹͍

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εϧʔϓοτ

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͕͜͜มΘͬͨɿฒྻ($ ˔ ($ͷॲཧΛฒྻ࣮ߦͯ͠ߴ଎Խ ˔ ϚϧνίΞ$16౥ࡌ୺຤͕૿͑ͯΔ͜ͱͩ͠ ˔ ౓ͷ($ʹ͔͔Δ࣌ؒΛ୹ॖ ˔ ࠶ϚʔΫͷఀࢭ͢Δॲཧ΋୹͘ͳͬͯخ͍͠ ϧʔτ  εΩϟϯ ϚʔΫ ࠶ϚʔΫ εΠʔϓ

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͕͜͜มΘͬͨɿฒྻ($ ˔ ($ͷॲཧΛฒྻ࣮ߦͯ͠ߴ଎Խ ˔ ϚϧνίΞ$16౥ࡌ୺຤͕૿͑ͯΔ͜ͱͩ͠ ˔ ౓ͷ($ʹ͔͔Δ࣌ؒΛ୹ॖ ˔ ࠶ϚʔΫͷఀࢭ͢Δॲཧ΋୹͘ͳͬͯخ͍͠

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͕͜͜มΘͬͨɿੈ୅ผ($ ˔ ଟ͘ͷΦϒδΣΫτ͸୹໋Ͱ͋Δɼͱ͍͏ԾઆΛ ར༻ͨ͠($ ˔ 4UJDLZNBSLCJUT($ ˔ લճͷ($Ҏ߱ʹ࡞ΒΕͨ͝Έ͚ͩճऩ ($ ($

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͕͜͜มΘͬͨɿੈ୅ผ($ ˔ ଟ͘ͷΦϒδΣΫτ͸୹໋Ͱ͋Δɼͱ͍͏ԾઆΛ ར༻ͨ͠($ ˔ 4UJDLZNBSLCJUT($ ˔ લճͷ($Ҏ߱ʹ࡞ΒΕͨ͝Έ͚ͩճऩ ($ ($ ($ର৅ ($ର৅֎

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͕͜͜มΘͬͨɿੈ୅ผ($ ˔ ଟ͘ͷΦϒδΣΫτ͸୹໋Ͱ͋Δɼͱ͍͏ԾઆΛ ར༻ͨ͠($ ˔ 4UJDLZNBSLCJUT($ ˔ લճͷ($Ҏ߱ʹ࡞ΒΕͨ͝Έ͚ͩճऩ ($ ($ ($ର৅ ($ର৅֎ ϐϯϙΠϯτͰ͝ΈΛճऩ

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͕͜͜มΘͬͨɿΞϩέʔλ ˔ %BMWJL7.ɿEMNBMMPD ˔ HMJCDͷNBMMPDʢͷେݩʹͳͬͨΞϩέʔλʣ ˔ ฒߦϝϞϦׂ౰ͯ͸ϩοΫͰഉଞ੍ޚ ˔ "35ɿ3PT"MMPD ˔ "35ಠࣗͷϝϞϦΞϩέʔλ ˔ 4FHSFHBUFEGSFFMJTU ˔ ฒߦϝϞϦׂ౰ͯʹରԠ

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ฒߦϝϞϦׂ౰ͯ ώʔϓ ۭ͖ྖҬ ࢖༻த εϨου εϨου

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ฒߦϝϞϦׂ౰ͯ ώʔϓ ۭ͖ྖҬ ࢖༻த εϨου new Object(); εϨου new Object();

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·ͱΊ ˔ "35͕Μ͹ͬͯΔ

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·ͱΊ ˔ "35͕Μ͹ͬͯΔ ˔ ͱ͍͏ΑΓ͸%BMWJL7.͕ΨόΨόͩͬͨʁ ˔ ͱʹ͔͘ؤுͬͯΔɼࠓޙʹ΋ظ଴

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·ͱΊ ˔ ฒߦ($ͷఀࢭՕॴ͕ΑΓ୹͘ͳͬͨ ˔ 458($ͷൃੜස౓͕௿͘ͳͬͨ ˔ -BSHF0CKFDU4QBDFʹΑΔஅยԽରࡦ ˔ ͜·໨ʹฒߦ($ ˔ εϧʔϓοτ΋վળ ˔ ฒߦ($ɼੈ୅ผ($ ˔ ϝϞϦׂ౰ͯͷฒߦॲཧʹରԠ ˔ 3PT"MMPD