Kotlin Nativeってandroid向けにもかけるんですよ

1. Kotlin Nativeͬͯandroid޲͚ ʹ΋ॻ͚ΔΜͰ͢Α 2022.07.20 Qiita Night 2022೥ɺAndroidΞϓϦ͸Ͳ͏࡞Δʁ Bunjiro Miyoshi
2. About Me • νʔϜϥϘॴଐ • (ࣗশ)ϚϧνϓϥοτϑΥʔϜܳਓ • ৽ଔͰAndroidΤϯδχΞͱͯ͠σϏϡʔɺAsyncTask͕ຮԆΔݹͷ ίʔυʹ͓ݟ෣͍͞ΕΔɻ࣮͸ͦΜͳʹRxॻ͚ͳ͍(Coroutine͹͔ Γ)ɻ
3. ΤϯδχΞɺ ࠷ऴతʹC͔C++ʹͨͲΓண͘આ
4. Android NDK࢖ͬͯ·͔͢ʁ C++ͩͬͯ೉͍͠ͷʹJNIʹͳΔͱߟ͑Δ͜ͱ૿͑Δɾɾɾɾ
5. ࠷ۙϚϧνϓϥοτϑΥʔϜདྷͯ·͢ ΑͶ
6. Kotlin Native࣮ͬͯ͸android NDK ޲͚ʹ΋ు͖ग़ͤΔ
7. Kotlin Multiplatformͱ͸
8. Kotlin Multiplatformͱ͸ 👈ࠓճ͸ίίʹয఺Λ౰ͯ·͢
9. Kotlin Nativeͱ͸ • αϙʔτ͍ͯ͠ΔPlatform • macOS, tvOS, watchOS • Linux • Windows(MinGW) • Android NDK Ref: https://kotlinlang.org/docs/native-overview.html
10. Kotlin Nativeͱ͸ • Static or DynamicϥΠϒϥϦΛੜ੒Ͱ͖Δ • Static or Dynamic CϥΠϒϥϦΛऔΓࠐΊΔ • (Swift, Objective-CͷϑϨʔϜϫʔΫ΋औΓࠐΊΔ)
11. Kotlin Native࣮ߦ࣌Πϝʔδ ஫ɿ࣮ࡍʹ͸Πϯετʔϧ࣌ͷAOTͱ͔΋བྷΉ
12. Kotlin Native࣮ߦ࣌Πϝʔδ ஫ɿ࣮ࡍʹ͸Πϯετʔϧ࣌ͷAOTͱ͔΋བྷΉ
13. ஫ɿ࣮ࡍʹ͸Πϯετʔϧ࣌ͷAOTͱ͔΋བྷΉ Kotlin Native࣮ߦ࣌Πϝʔδ
14. Kotlin Native࣮ߦ࣌Πϝʔδ ஫ɿ࣮ࡍʹ͸Πϯετʔϧ࣌ͷAOTͱ͔΋བྷΉ
15. Kotlin Native for Android Native • ݱঢ়API21͔Βαϙʔτ͞Ε͍ͯΔωΠςΟϒAPIʹରԠ͞Ε͍ͯΔ(ͬΆ͍) • ҎԼ͸Kotlin NativeΛ༻͍ͯKotlinͰ৮ΕΔ • jniपΓͷ͋Ε͜Ε༻ͷinterface • android native app API(Native ActivityͳͲ) • EGL(GLES1~3.1ؚΉ) • media • OpenMAX AL • posix(linuxίϚϯυྨ) • zlib Android NDKެࣜͷωΠςΟϒAPIҰཡ https://developer.android.com/ndk/guides/stable_apis?hl=ja
16. Kotlin NativeΛNDK޲͚ʹॻ͖ग़͢
17. ઃఆɿSourceSets
18. ઃఆɿSourceSets androidNative༻ʹ༻ҙ͞Ε͍ͯΔϓϦ ηοτ༻ͷؔ਺Λ࢖ͬͯఆٛ
19. ઃఆɿSourceSets ు͖ग़͞ΕΔϥΠϒϥϦ͕੩తͳͷ͔ಈ తͳͷ͔Λఆٛ(ࠨ͸ಈత)
20. ઃఆɿbuild Ϗϧυ࣌ʹandroidϓϩδΣΫτʹ.soϑΝ ΠϧΛίϐʔ͢ΔॲཧΛKotlin Nativeଆͷ ϓϩδΣΫτʹ௥Ճ͢Δ K/NϓϩδΣΫτ͸androidϥΠϒϥϦͱ ͯ͠ೝࣝͰ͖ͳ͍ͨΊखͰϑΝΠϧΛί ϐʔͯ͋͛͠Δඞཁ͕͋Δ
21. Kotlin NativeΛݺͼग़͢
22. ܕͷޓ׵ੑ(Primitive) KBWB KOJ $ $
    PO
    ,/ LPUMJO
    PO
    ,/ CPPMFBO KCPPMFBO VJOU@U \MJCSBZ^@,#PPMFBO #PPMFBO CZUF KCZUF JOU@U \MJCSBZ^@,#ZUF #ZUF DIBS KDIBS VJOU@U \MJCSBZ^@,$IBS $IBS TIPSU KTIPSU JOU@U \MJCSBZ^@,4IPSU 4IPSU JOU KJOU JOU@U \MJCSBZ^@,*OU *OU MPOH KMPOH JOU@U \MJCSBZ^@,-POH -POH fl PBU K fl PBU fl PBU \MJCSBZ^@,'MPBU 'MPBU EPVCMF KEPVCMF EPVCMF \MJCSBZ^@,%PVCMF %PVCMF WPJE WPJE  \MJCSBZ^@,/BUJWF1US 
23. JNI on K/NΛ͏·͘΍ΔTips Primitiveฤ • Primitiveͳܕ͸ͦͷ··K/N্Ͱ΋KotlinΫϥεͰड͚औΕΔ • instanceΛੜ੒͢Δࡍ͸allocΛࣗಈͰ΍ͬͯ͘ΕΔmemScopedؔ ਺Λ༻͍ͯϝϞϦ൪஍͕Scope಺ͰෆมʹͳΔΑ͏ʹ͢Δ RefrectionฤɺStructฤ͸Ͳ͔͜Ͱ࿩ͤͨΒɾɾɾɾ
24. JNI on K/NΛ͏·͘΍ΔTips Primitiveฤ
25. JNI on K/NΛ͏·͘΍ΔTips Primitiveฤ instanceੜ੒͢Δͱallocͯ͘͠ΕΔ
26. JNI on K/NΛ͏·͘΍ΔTips Primitiveฤ ͳʹ͔ॲཧ͢Δ
27. JNI on K/NΛ͏·͘΍ΔTips Primitiveฤ ࠷ޙʹϝϞϦղ์ͯ͘͠ΕΔ Ұ൪࢖͏ྫͱͯ͠memScopedΛऔΓ্͕͛ͨଞʹ΋৭ʑศརؔ਺ ͕kotlinx.cinteropʹఆٛ͞Ε͍ͯΔ
28. ు͖ग़ͨ͠.so ϑΝΠϧΛNDKʹಡΈࠐ·ͤΔ • Kotlin Nativeʹ͸ύοέʔδͷ֓೦͕ଘࡏ͍ͯ͠Δ • τοϓϨϕϧؔ਺ͳͲͷ໊લۭ͕ؒͿ͔ͭΒͳ͍ͷ͸͜Εͷ͓͔ ͛ • ex.)cଆ͔ΒΈΔͱprintؔ਺͸Kotlin_io_Console_printʹͳͬͯͨ Γ͢Δ • ݺͼग़͠ํ͕ಠಛ(৑௕)ʹͳΔ
29. ు͖ग़ͨ͠.so ϑΝΠϧΛNDKʹಡΈࠐ·ͤΔ ·ͣK/Nͷexported symbolsΛऔΓग़͢
30. ు͖ग़ͨ͠.so ϑΝΠϧΛNDKʹಡΈࠐ·ͤΔ ໨తͷTop Levelؔ਺ɺΫϥεΛݺͼग़͢ K/N RuntimeΛੜ੒ͯ͠ɺ͓໨౰ͯͷΫϥε΍ؔ਺Λݺͼग़͢Πϝʔδ
31. ύϑΥʔϚϯεͲ͏ͳͷΑ
32. ܭଌɿલఏ • Kotlin Nativeͷnew mm͸ෆ࢖༻ • Kotlin NativeͰ.soΛు͖ग़ͯͦ͠ΕΛndkʹऔΓࠐΜͰॲཧΛݺͼग़͢ • ࠓճ͸ΈΜͳେ޷͖ϑΟϘφονؔ਺Ͱܭଌ(Ұ൪Order਺ͷଟ͍࠶ؼ ύλʔϯ) • CoroutineͳͲΛ༻͍ͯॲཧதͷ࣮ߦεϨουͷมߋͳͲ͸ߦΘͳ͍ • tailrecΛ࢖ͬͨݴޠϨϕϧͷ࠷దԽ͸ߦΘͳ͍
33. ܭଌɿ݁Ռ ߲਺a࣮૷
    NT LPUMJO $ ,/                                    
34. ܭଌɿ·ͱΊ • ࠓճͷܭଌͰ͸ૉͷωΠςΟϒ࣮૷Λ্ճΕΔ݁Ռ͕ग़ͨ • ͜ͷ෦෼͸ڪΒ͘NDKͷ஌ࣝෆ଍Ͱ࠷దԽෆ଍ͳ෦෼͕͋Δ͸ͣ • K/N͸debug symbol͕ॏΊͳͷͰ͔ͬ͠ΓReleaseϏϧυΛ࢖ͬͨ ΄͏͕Α͍
35. ·ͱΊᶃ • ૉఢͳͱ͜Ζ • IDEࢧԉΛ͞Βʹड͚΍͍͢(CLion࣋ͬͯͳ͍ਓͰ΋Ϧονͳࢧԉ͕΋Β͑Δ) • ڧྗͳstdlibपΓΛઃఆͳ͠Ͱ࢖͑Δ • ίΞϩδοΫʹؔͯ͠͸׳ΕͯΔKotlinΛ࢖ͬͯهड़͢Δ͜ͱ͕Ͱ͖Δ • ͋ͱҰาͷͱ͜Ζ • Kotlin࢖ͬͯΔͷʹPointerΛҙ࣮ࣝͨ͠૷͕ՕॴՕॴͰൃੜ͢Δ • coroutine, atomicfu͕ରԠ͞Εͯͳ͍ରԠ͞ΕΔݟࠐΈ΋ͳ͍(͕ճආࡦࣗମ͸͋Δ) • ύϑΥʔϚϯεͦΜͳʹΑ͘ͳ͍ ૉͷ࣮૷ΑΓૣͯ͘ϏοΫϦ
36. ·ͱΊᶄ • ωΠςΟϒϥΠϒϥϦ͔͠ͳ͍͚ͲͲ͏ͯ͠΋C++ͷΩϟονΞο ϓ΋͢Δ༨༟͕ͳ͍ɺͱ͍͏৔߹ʹͲ͏Ͱ͠ΐ͏͔
37. ߏ଄ମޓ׵ฤ, CInteropฤʹଓ͘ to be continued….