Java Bytecode Vertical Tasting

by punchdrunker

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7FSUJDBM5BTUJOHਨ௚ࢼҿͱ͸ ಉ͡໏ฑͷϫΠϯΛ೥౓ҧ͍Ͱࢼҿ͢Δख๏ ೥౓͝ͱͷಛ௃Λ೺ѲͰ͖Δ ϙςϯγϟϧͱมԽΛ֬ೝ͢Δࣄ͕Ͱ͖Δ ࠓճ͸ޙ൒ͷσϞͰ೥౓ҧ͍ͷKBWBDΛ࣮ߦ ͠ɺग़དྷ্͕ͬͨDMBTTϑΝΠϧͷಛ௃΍มԽ ΛςΠεςΟϯά͍ͨ͠ͱࢥ͍·͢ɻ

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ຊ೔ఏڙυϦϯΫͷ঺հ 4VOTFU$FMMBSTϫΠϯछ ന੺ 1BVM(JSBVEͿͲ͏δϡʔε ඍ୸ࢎ ʮΤϯδχΞ͚ͩͲถࠃͰϫΠφϦʔΛങͬͨ࿩ʯ ͷϫΠφϦʔͰ͢ ίχϟοΫੜ࢈ऀ͕ຖ೥࡞Δ ͿͲ͏ՌोͷδϡʔεͰ͢ ͓ञͰ͸͋Γ·ͤΜ

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,PUMJO$POGࢀՃ w ϫʔΫγϣοϓࢀՃ w ͋·Γ"OESPJEΆ͘ͳ͍ηογϣϯΛݟΔ w ϏʔϧΛҿΈʹߦ͘ w ಉ͡ళʹଞͷࢀՃऀ΍+BLF΋͍ͨ

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͜ͷτʔΫͷ໨త ͠͹Β͘ಡΉͷΛޙճ͠ʹ͍ͯͨ͠+BLF8IBSUPOͷ࠷ۙͷ CMPH΍ࠓճͷ࿩ΛҰؾʹಡΜͰΈͯɺͱͯ΋໘ന͔ͬͨͰ ͢ɻ IUUQTKBLFXIBSUPODPNCMPH ͨͩɺॳ৺ऀ΍+BWBͷ஌͕ࣝແ͍ͱ͔ͳΓͱ͖ͬͭʹ͍͘಺ ༰ͳͷͰɺཧղʹඞཁͱͳΔલఏ஌ࣝͳͲΛͳΔ΂͘Θ͔Γ ΍͘͢આ໌͠·͢ɻ

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໘ന͔ͬͨτʔΫ w 5IFTIVUUMFDBTF4UFQIFO$BSWFS w LFZOPUFΞʔΧΠϒಈը I ͷ࠷ॳͷηογϣϯ w εϖʔεγϟτϧͷࣄނͱൃలͷྺ࢙Λ঺հ w "TZODISPOPVT%BUB4USFBNTXJUI,PUMJO'MPXCZ3PNBO&MJ[BSPW w ਤղ͕Θ͔Γ΍͍͢$PSPVUJOFͷ࿩ w ,PUMJO3VOT5BYFTJO/PSXBZCZ+BSMF)BOTFO"OEFST.JLLFMTFO w ϊϧ΢Σʔͷࠃ੫γεςϜΛ,PUMJOY4QSJOH#PPUͰӡ༻ͯ͠Δ࿩

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ࠓճ঺հ͢Δͷ͸

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Ͱ΋౰೔ݟ·ͤΜͰͨ͠ w ࠷ۙͷ+BWBͷ࿩ΛΩϟονΞοϓ͍ͯ͠ͳ͔ͬͨ w ࣮ࡍʹ৮ͬͨ͜ͱͷ͋Δ࠷৽ͷ+BWB͸ w ͦ΋ͦ΋࠷৽ͷ"OESPJEͰ΋+BWB·Ͱ͔͠࢖͑ͳ͍ w ࠷ۙͷঢ়گͱ͔Λௐ΂͔ͯΒษڧ͠Α͏ͱࢥͬͨ

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ઌʹ+BLFͷ݁࿦Λ·ͱΊΔͱ +BWBͷ৽͍͠ػೳ΍7.ͷਐԽ͸,PUMJOʹ΋Ըܙ͕͋ΔɻͳͥͳΒͦΕΒ͸LPUMJOD͔ Β΋ར༻Մೳ͔ͩΒɻ OVMMഇࢭͷಈ͖͸ͳͦ͞͏ͩΑɻڊେͳܕγεςϜʹͱͬͯ͸OVMMͷԸܙ΋͋Δ͔Β Ͷɻ ,PUMJOʹ͸ϚΠάϨʔγϣϯͱ͔ࣗಈͰग़དྷͪΌ͏͍͢͝*%&͕͋Δ͠ɺͦΕ͸+BWB ʹ͸ग़དྷͳ͔ͬͨࣄͩͶɻ NVMUJQMBUGPSNͷ໘Ͱ΋,PUMJO͸͔ͳΓΠέͯΔ͠ɺ,PUMJO΋࢖ΘΕଓ͚Δͱࢥ͏Αɻ ೥ޙ΋Ҿ͖ଓ͖KBWBͱLPUMJO͸੾᛭ୖຏ͍ͯ͠Δͱࢥ͏ɻ

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݁࿦ͷഎܠ ਪଌؚΉ +BWB͸ϦϦʔεαΠΫϧ΋มԽͯ͠ͲΜͲΜਐԽͯ͠ɺ͜ ͷϖʔεͩͱ೥ޙʹ͸$PSPVUJOF૬౰ͷ΋ͷ΋ϦϦʔε ͞ΕΔݟࠐΈɻ 1SPKFDU-PPNͱ͔ ͦ͏ͳΔͱ,PUMJOͬͯଘࡏҙٛͲͷ͘Β͍ͳͷ ͱ͍͍͏ ໰͍ʹର͢ΔΞϯαʔηογϣϯ͕ࠓճͷ͓୊Ͱ͢ɻ

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എܠΛཧղ͢ΔͨΊͷॏཁͳτϐοΫ w +BWBϦϦʔεαΠΫϧ w "OESPJEͰಈ͘+BWBͬͯ w +BLF8IBSUPO#MPHͷ%3TFSJFT ೥݄͘Β͍͔Βͷ࿈࡞ w %ʹΑΔEFTVHBS w +BWBͷ৽ػೳ͍Ζ͍Ζ w +BWBͷόΠτίʔυΛ஌Δ w KBWBDKBWBQͭͷίϚϯυ͕࢖͑Ε͹େৎ෉ େৎ෉͡Όͳ͍

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+BWBͷۙگ w ࠷৽όʔδϣϯ͸ w +BWB͸0SBDMF͕ॴ༗ w େମ+BWBͷ్த͘Β͍Ͱ4VO͕0SBDMFʹങऩ͞ΕͯΔ w େࡶ೺ʹݴ͏ͱ0QFO+%,ͱͦΕʹ঎༻ػೳΛ௥Ճͨ͠0SBDMF+%,͕͋Δ w +BWB͋ͨΓ͔Β৽͍͠ϦϦʔεαΠΫϧʹͳͬͨ w ΊͬͪΌ৽ػೳ͕௥Ճ͞Ε͍ͯͬͯΔ

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8JLJQFEJBΑΓ

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8JLJQFEJBΑΓ

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"OESPJEͱ+BWB w "OESPJE"1*Ҏ߱͸+BWBͷຆͲͷػೳΛ࢖͑Δ w "OESPJE"1*͸+BWB͔͠ಈ͔ͳ͍ w NJO4EL7FSTJPO͕ҎԼͩͱ+BWBͷόΠτίʔυ͕ඞཁ w ͘Θ͘͠͸ެࣜͰˠ+BWBݴޠػೳͷ࢖༻ w IUUQTEFWFMPQFSBOESPJEDPNTUVEJPXSJUFKBWBTVQQPSU

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Ͱ΋+BWBͰ։ൃͰ͖ͯΔ͚Ͳ

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ͦΕɺ%FTVHBS͞Εͯ·͢

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EFTVHBS

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EFTVHBS

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class Java8 { interface Logger { void log(String s); } public static void main(String!!... args) { sayHi(s !-> System.out.println(s)); } private static void sayHi(Logger logger) { logger.log("Hello!"); } } DMBTTDPVOU .FUIPEDPVOU ͨͱ͑͹MBNCEB͸

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͜͏ͳΔ +BWBͰ΋ ಈ͖ͦ͏ class Java8 { interface Logger { void log(String s); } public static void main(String!!... args) { sayHi(Java8$1.INSTANCE); } static void lambda$main$0(String s) { System.out.println(s); } private static void sayHi(Logger logger) { logger.log("Hello!"); } } class Java8$1 implements Java8.Logger { static final Java8$1 INSTANCE = new Java8$1(); @Override public void log(String s) { Java8.lambda$main$0(s); } }

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class Java8 { interface Logger { void log(String s); } public static void main(String!!... args) { sayHi(Java8$1.INSTANCE); } static void lambda$main$0(String s) { System.out.println(s); } private static void sayHi(Logger logger) { logger.log("Hello!"); } } class Java8$1 implements Java8.Logger { static final Java8$1 INSTANCE = new Java8$1(); @Override public void log(String s) { Java8.lambda$main$0(s); } } Ͱ΋ ͍Ζ͍Ζ૿͑ͯΔ $MBTTDPVOU .FUIPEDPVOU

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ϝιου਺͕૿͑Δͱ MULTIDEX

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MBNCEB͸Ͳ͜ʹߦͬͨͷ NJO4EL7FSTJPOʹ͢Ε͹ /BUJWF-BNCEBΛ࢖͑ΔΆ͍Ͱ͢ɻ ૣͯ͘೥ޙ͘Β͍ େମ+BWBͷ࣌ظ

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+BWB·Ͱͷ৽ػೳ·ͱΊ w +BWB w MBNCEB w NFUIPESFGFSFODF w TUBUJDBOEEFGBVMUNFUIPETJOJOUFSGBDFT w +BWB w $PODJTF5SZ8JUI3FTPVSDFT w "OPOZNPVT%JBNPOE w 1SJWBUF*OUFSGBDF.FUIPET w TUSJOHDPODBUXJUIPVU4USJOH#VJMEFS w +BWB w 7BSGPSMPDBMWBSJBCMF XIFOUIFUZQFDBOCFJOGFSSFE w +BWB w WBSPOMBNCEBWBSJBCMFT w /FTUNBUFT w KBWB w TXJUDIFYQSFTTJPOT OPU੍ޚจ w KBWB w NVMUJMJOFTUSJOH USJQMFRVPUFT

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+BWBҎ߱༧ఆ͍ͯ͠Δ৽ػೳ w KBWB w SFDPSET EFTUSVDUVSJOH w TFBMFEJOUFSGBDF w UZQFNBUDIJOH w QBUUFSONBUDIJOHPGJOTUBODF w KBWB w MPDBMGVODUJPO w 7JSUVBM5ISFBET -PPN w KBWB w JOMJOFDMBTT

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͔͜͜Β͕ຊ୊

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+BWBͱ+BWBͰϏϧυͯ͠Έ·͢ public class Outer { private String name = "Jake"; class Inner { String sayHi() { return "Hi " + name + "!"; } } } w

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࢖͏ίϚϯυ w YYE w όΠφϦΛਐ਺Ͱදࣔͯ͘͠ΕΔίϚϯυ w KBWBD w +BWBͷίʔυΛίϯύΠϧͯ͘͠ΕΔίϚϯυ w KBWBQ w ίϯύΠϧͨ͠੒Ռ෺ΛٯΞηϯϒϧͯ͘͠ΕΔίϚϯυ

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+BWB

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+BWB

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,PUMJO

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ࠓճ֬ೝͰ͖ͨ఺ w *OOFSDMBTT͔ΒQSJWBUFpFME΁ΞΫηεͨ࣌͠ʹൃੜ͢Δ߹੒ΞΫηα͕ ࣗಈੜ੒͞ΕΔ ϝιου͕૿͑ͯ͠·͏ ໰୊͕ղফ͞Εͨ /FTUNBUFT w จࣈྻ࿈͕݁಺෦తʹ͸4USJOH#VJMEFSͷBQQFOEͰ͸ͳ͘ɺίΞϥΠϒϥ Ϧͷ໋ྩͰॲཧ͞ΕΔΑ͏ʹͳͬͨɻ w ,PUMJOͰॻ͍ͯ΋ੜ੒͞ΕΔόΠτίʔυ͸มΘΒͳ͍

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·ͱΊ w ,PUMJO͸4UZMJTI4IJOZ͕ͩɺੜ੒͞ΕΔCZUFDPEF͸ࠜຊతʹ͸+BWBͰ ॻ͍ͯ΋Ұॹͷ΋ͷ͕ग़དྷΔɻ w ,PUMJO΋+BWBͱڞʹ੒௕͍ͯ͘͠ɻ w "OESPJEͰ+BWB΍͕ಈ͘Α͏ʹͳͬͨͱͯ͠΋͠͹Β͘͸ैདྷͷ "OESPJE +BWBPS ͱޓ׵ੑΛอͭҝʹEFTVHBS͠ଓ͚Δඞཁ͕͋Δɻ w ΑΓྑ͍όΠτίʔυͰΞϓϦΛ഑৴͢ΔͨΊʹ͸௕͍͕͔͔࣌ؒΔ w ͍͢͝ൃ໌ͰҰؾʹϏϧυपΓͷվળ͕Ճ଎͢ΔࣄΛظ଴ ଞྗຊئ

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