Ruby へコードをコントリビュート してみた話

第5回 meguro.rb LT で Ruby へ performance improvement の patch を送った話をしました
https://github.com/ruby/ruby/pull/1626
https://megurorb.connpass.com/event/61668/

1. 3VCZ
   ΁ίʔυΛίϯτϦϏϡʔτ
   ͯ͠Έͨ࿩
   
   /BP
   .JOBNJ
   !TPVUI
2. ࣗݾ঺հ
3. /BP
   .JOBNJ
   
   !TPVUI
   !NJOBNJP 4PGUXBSF
   FOHJOFFS
   
   !
   8BOUFEMZ
   *OD
4. 3VCZ
   ʹίʔυΛ
   ίϯτϦϏϡʔτͯ͠Έ͍ͨʂ
5. ͕ɺॳΊͯͩͱෆ҆ɻɻɻ
6. ࣮͸؆୯ͳεςοϓͰ
   ίϯτϦϏϡʔτग़དྷΔ
7. ࣮͸؆୯ͳεςοϓͰ
   ίϯτϦϏϡʔτग़དྷΔ ෆཁͳϋʔυϧΛͳ͘͢
8. w 
   3VCZ
   ΁ίʔυΛίϯτϦϏϡʔτ͢Δํ๏
   w 
   ࣮ࡍʹ13ͱUJDLFUΛ࡞ͬͨ࿩
   w 
   ·ͱΊ ࠓ೔࿩͢಺༰
9. w 
   3VCZ
   ΁ίʔυΛίϯτϦϏϡʔτ͢Δํ๏
   w 
   ࣮ࡍʹ13ͱUJDLFUΛ࡞ͬͨ࿩
   w 
   ·ͱΊ ࠓ೔࿩͢಺༰
10. 
    3VCZ
    ΁ίʔυΛίϯτϦϏϡʔτ͢Δํ๏ w 3VCZ
    ΁ͷίϛϡχέʔγϣϯνϟωϧ͸ଟ਺
    w 
    3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN
    w 
    .BJMJOH
    -JTU
    w 
    *3$
    w 
    (JU)VC
    w 
    $POGFSFODF
    DG
    3VCZ,BJHJ
    w FUDʜ
11. 
    3VCZ
    ΁ίʔυΛίϯτϦϏϡʔτ͢Δํ๏ w 3VCZ
    ΁ͷίϛϡχέʔγϣϯνϟωϧ͸ଟ਺
    w 
    3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN
    w 
    .BJMJOH
    -JTU
    w 
    *3$
    w 
    (JU)VC
    w 
    $POGFSFODF
    DG
    3VCZ,BJHJ
    w FUDʜ ίʔυͷίϯτϦϏϡʔτͳΒ͜ͷͭ
12. 3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN
14. 3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN w #VH
    3FQPSU
    #VH
    'JY
    'FBUVSF
    1SPQPTBM
    ʹར༻
    w #VH
    'FBUVSF
    .JTD
    ͷϥϕϧ
    w QBUDI
    ͳͲ༷ʑͳϑΝΠϧΛఴ෇ w ࣮૷Λ൐͏ఏҊ͸
    QBUDI
    Ͱදݱ
    w DG
    IBTI
    UBCMF
    ͷ಺෦࣮૷ͷมߋ
    'FBUVSF
    
    
15. 3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN w ྑ͍఺
    w QBUDI
    BTTJHO
    ͳͲ
    *TTVF
    5SBDLJOH
    4ZTUFN
    ʹඞཁͳ ػೳ͸උ͑ͯΔ w ܽ఺
    w SFENJOF
    ʹ׳Εͯͳ͍ͱऔͬ෇͖೉͍͔΋ʁ
    w μ΢ϯϩʔυ͠ͳ͍ͱ
    QBUDI
    ͕ݟΕͳ͍ͷ͸໘౗
    
16. (JU)VC
    SVCZSVCZ
18. (JU)VC
    SVCZSVCZ w GPSL
    ͯ͠
    13
    Λ࡞੒
    w ଞͷ
    044
    ͱಉ͡ײ֮Ͱؾܰʹ
    $POUSJCVUFʂ
19. (JU)VC
    SVCZSVCZ ͨͩ͠ɻɻɻ
21. (JU)VC
    SVCZSVCZ w খ͞ͳमਖ਼͸ɺ13
    ͚ͩͰ΋0,
    w ͨͩɺٞ࿦ʹͳΔมߋ͸
    3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFNͰ
    5JDLFU
    ΋࡞ͬͯͶͬͯӡ༻ w *TTVF
    ΋
    (JUIVC
    ʹ͸ଘࡏ͠ͳ͍
    w 3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFNͰ׬શʹ؅ཧ
22. ͡Ό͋ɺίʔυΛίϯτϦϏϡʔτ͍ͨ࣌͠͸
    Ͳͷ΍Γํ͕ྑ͍ͷ͔ʁ
23. ݸਓతʹ͸ɺ(JU)VC
    Ͱ
    13
    Λ࡞ͬͯɺಉ͡಺༰Ͱ
    
    3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN
    Ͱ
    5JDLFU
    ࡞੒͕Φεεϝʂ
26. ଞͷ
    044
    ΁ͷίϯτϦϏϡʔτͱಉ༷ɺ
    (JU)VC
    ্Ͱ
    13
    Λ࡞੒͢Δ͚ͩͰ΄΅׬݁ʂ
27. w 
    3VCZ
    ΁ίʔυΛίϯτϦϏϡʔτ͢Δํ๏
    w 
    ࣮ࡍʹ13ͱUJDLFUΛ࡞ͬͨ࿩
    w 
    ·ͱΊ ࠓ೔࿩͢಺༰
28. 
    ࣮ࡍʹ
    13
    ͱ
    5JDLFU
    Λ࡞ͬͨ࿩ w ιʔείʔυϦʔσΟϯά͍ͯͯ͠ɺඇޮ཰ͳ ॲཧΛൃݟ
    w 4USJOH
    *OUFSQPMBUJPO
    ͷॲཧ w ྑ͍ػձͳͷͰɺ13
    Λ࡞ͬͯΈͨ [1] pry(main)> world = :world => :world [2] pry(main)> "hello, #{world}!" => "hello, world!"
31. 
    13
    5JDLFU
    ͷݱঢ় w ͪΐ͏Ͳࠓ೔
    FODPEJOH
    ͷ
    #VH
    
    ʹ͍ͭͯίϝϯτ Λ΋ΒͬͨX
    मਖ਼ࡁΈ w ࠓ͸औΓࠐΜͰ΋Β͑ΔͷΛؾ௕ʹ଴͍ͬͯΔ
    w ٞ୊ϦετʹೖͬͯΔͷ͸ݟͨͷͰظ଴ɻɻɻ
32. 
    13
    ͷ಺༰ w 3VCZ
    ͷ
    4USJOH
    ͸಺෦Ͱ
    $
    TUSJOH
    Λอ࣋͢Δ༻ ͷ
    $
    BSSBZ
    Λ࣋ͭ
    w ௕͕͞଍Γͳ͘ͳΔͱɺ΋ͬͱେ͖ͳྖҬΛ ֬อͯ͠ݹ͍஋Λίϐʔ
    3FTJ[JOH w ࣄલʹඞཁͳྖҬͷେ͖͞Λܭࢉ͓͍ͯͯ͠ɺ ෆཁͳ
    3FTJ[JOH
    Λආ͚Δ࠷దԽΛͨ͠
33. 3VCZ
    ͷจࣈྻ H e l l o , MFOHUI
    
    DBQBDJUZ
     ”hello,” ”hello,” + ”world” => ”Hello,world” lXPSMEz
    ͱ݁߹͢Δͱ
    จࣈͳͷͰDBQBDJUZ
    
    Ͱ͸
    ऩ·Βͳ͍ H e l l o , w o r l d Λߟ͑Δ 3VCZ
    ͷ
    4USJOH
    ͷϝϞϦϨΠΞ΢τུ֓
34. 3VCZ
    ͷจࣈྻ H e l l o , H e l l o , w o r l d MFOHUI
     DBQBDJUZ
     H e l l o , MFOHUI
     DBQBDJUZ
     MFOHUI
     DBQBDJUZ
     େ͖ͳϝϞϦΛ֬อ͠ɺͦ͜΁ݹ͍஋Λίϐʔ ௥Ճ͞ΕΔ
    lXPSMEz
    Λॻ͖ࠐΈ
35. 3VCZ
    ͷ
    4USJOH
    *OUFSQPMBUJPO [1] pry(main)> world = :world => :world [2] pry(main)> "hello, #{world}!" => "hello, world!" ্هͷίʔυ͸ɺ಺෦ͰҎԼͱ౳ՁͳॲཧΛ͞ΕΔ
    ʢ࣮ࡍʹ͸
    $
    Ͱॻ͔ΕͯΔʣ "hello, " + :world.to_s + "!" A A
    ͷͨͼʹ
    ίϐʔ͕૸Δͱ஗͘ͳΔ͕ɺ
    ͦΕΛආ͚Δͱૣ͘ͳΔʂ
36. 4USJOH
    *OUFSQPMBUJPO
    Λߴ଎Խʂ
37. w 
    3VCZ
    ΁ίʔυΛίϯτϦϏϡʔτ͢Δํ๏
    w 
    ࣮ࡍʹ13ͱUJDLFUΛ࡞ͬͨ࿩
    w 
    ·ͱΊ ࠓ೔࿩͢಺༰
38. 
    ·ͱΊ w 3VCZ
    ΋ɺଞͷ
    044
    ͱಉ༷ʹ
    13
    Λ࡞ͬͯؾܰʹ ίʔυίϯτϦϏϡʔτͰ͖Δʂ
    w ͨͩ͠ɺ3VCZ
    *TTVF
    5SBDLJOH
    4ZTUFN
    ʹ
    5JDLFU
    Λ࡞Δͷ͸๨Εͣʹ w ΈΜͳͰ
    3VCZ
    Λ΋ͬͱྑ͍΋ͷʹ͍ͯ͜͠͏ʂ
39. ࢀߟ w 3VCZ
    8JLJ
    w IUUQTCVHTSVCZMBOHPSHQSPKFDUTSVCZXJLJ
    w )PX
    5P
    $POUSJCVUF
    w IUUQTCVHTSVCZMBOHPSHQSPKFDUTSVCZXJLJ )PX5P$POUSJCVUF
    w %FWFMPQFS
    )PX
    5P
    w IUUQTCVHTSVCZMBOHPSHQSPKFDUTSVCZXJLJ %FWFMPQFS)PXUP