魅せるデバッグ技術

iOSDC Reject Conference days2

Transcript

1. 2016/08/31
   iOSDC Reject Conference days2
   @dealforest
   Toshihiro Morimoto
   ັͤΔσόοάٕज़
   

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2. ࣗݾ঺հ
   

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3. Works
   

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5. (ͭд⊂)ŠƄŢŠƄŢ
   

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7. ʢʀƅЧƅʣ …ʂʁ
   

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8. ొஃऀ͕ޙ൒Λ઎ΊΔͱ͍͏๫ڍw
   

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9. ັͤΔσόοάٕज़
   

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11. ͯ͞ɺօ͞Μ
    ͜͏͍͏৔߹Ͳ͏͠·͔͢ʁʁ
    

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14. ౰વ͜Εʹؾ͍ͮͨҙࣝͷߴ͍
    ͋ͳͨ͸σόοάΛ։࢝͠·͢
    

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15. ϩάΛ࢓ࠐΜͰ…
    

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16. ࠶ىಈʂ
    

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18. (ͭд⊂)ŠƄŢŠƄŢ
    

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20. ※ ຊਓͷڐՄ͸ಘ͍ͯ·͢
    

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21. Α͠ɺ࣍ʹ࠶ݱͨ͠Βௐ΂Α͏…
    

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22. ϓϦϯτσόοά͋Δ͋ΔͰ͢Ͷ
    

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23. ࢓ํͳ͍ͷͰ೴಺σόοά։࢝
    

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24. ݪҼީิ
    • େݩͷը૾͋Δʁ
    • ௨৴Τϥʔʁ
    • cache ͯͨ͠ը૾͕͓͔͍͠ʁ
    • SDWebImage, Kingfisher ͳͲͷ͍ͤʁ
    

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25. શવΘ͔Γ·ͤΜͶ
    

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26. ͦΜͳ࣌ͦ͜ LLDB ͷग़൪Ͱ͢
    

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27. LLDB ͳΒͦͷλΠϛϯάͰͷ
    ৘ใΛऔಘ͢Δ͜ͱ͕Ͱ͖·͢
    

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28. େݩͷը૾͋Δ?
    ϒϥ΢βͰ௚઀ͦͷ URL Λ։͍͍ͯͩ͘͞w
    

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29. ௨৴Τϥʔʁ
    ΤϥʔϋϯυϦϯάͯ͠ΔՕॴʹ Breakpoint Λઃఆ͢Δ
    ΤϥʔϋϯυϦϯά͍ͯ͠ͳ͍ͳΒɺϥΠϒϥϦͷதͰ
    ֘౰ՕॴΛؤுͬͯݟ͚͍ͭͯͩ͘͞ɻ
    (͔ͬͯɺ΍ͬͯͳ͍ਓͳΜ͍ͯͳ͍ͱࢥ͏͚Ͳ)
    

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30. cache ͯͨ͠ը૾͕͓͔͍͠ʁ
    (lldb) po let $URL = NSURL(string: “http://~”)
    (lldb) po let $request = NSURLRequest(URL: $URL)
    (lldb) po let $data = NSURLCache.sharedURLCache().
    cachedResponseForRequest(request)!.
    data
    (lldb) po let $path = “/Users/dealforest/cache.png”
    (lldb) po $data.writeToFile($path, atomically: true)
    

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31. SDWebImage, Kingfisher ͳͲͷ͍ͤʁ
    // Kingfisher ͷ৔߹
    (lldb) po let $URL = NSURL(string: “http://~”)
    (lldb) po let $resource = Resource(downloadURL: $URL)
    (lldb) po let $cache = KingfisherManager.sharedManager.cache
    // memory
    (lldb) po let $image =
    $cache.retrieveImageInMemoryCacheForKey($resource.cacheKey)
    // disk
    (lldb) po let $image =
    $cache.retrieveImageInDiskCacheForKey($resource.cacheKey)
    (lldb) po let $data = UIImagePNGRepresentation($image)!
    (lldb) po $data.writeToFile(, atomically: true)
    

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32. ͍͔͕Ͱ͔͢ʁʁ
    

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33. গ͠͸ঢ়گ͕೺ѲͰ͖ͨ͸ͣͰ͢
    

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34. Ұ౓͚ͩͳΒ·ͩ͠΋
    ͳΜͲ΋ಉ͜͡ͱ͢ΔͱͳΔͱ…
    

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35. ϥΠϒϥϦʹ͢Δͷ΋ͳ…
    

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36. ࢓ํͳ͍
    ͦ͏͍͏Ϋϥε࡞Δ͔
    

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37. ଞͷϓϩδΣΫτͰ΋࢖͍͍ͨͳ
    

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38. ίϐϖ
    

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39. ͦ͏͢Δͱ
    ϓϩμΫτͱؔ܎͕ͳ͍ίʔυ͕
    ૿͍͖͑ͯ·͢
    

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40. ͔͠΋ϓϩδΣΫτຖʹ
    มΘͬͯΓ͢Δͱ…
    

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41. Φϫλ ʘ(^o^)ʗ
    

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42. LLDB ͷ Plugin ʹ͢Ε͹͍͍Μͩʂ
    

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43. analyse_image
    // ΦϦδφϧը૾Λϒϥ΢βͰ։͖
    // ֤ cache ͷը૾Λग़ྗ͠ Preview Ͱදࣔ͢ΔίϚϯυ
    (lldb) analyse_image “http://~”
    [original] browser open
    [request] ok
    [cache] ok -> “/cache.png”
    [Kingfisher] memory ok -> “/kingfisher_memory.png”
    [Kingfisher] disk ok -> “/kingfisher_disk.png”
    

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44. Ͳ͏Ͱ͔͢ʁʁ
    ͜ΜͳͷϖΞϓϩͰ͞ΕͨΒ
    

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45. ͓͓͓͓͓͓͓ʂʂʂʂʂ
    Έ͍ͨʹͳͬͪΌ͍·ͤΜ͔ʁʁ
    

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46. ͳΓ·͢ΑͶʁʁ
    

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47. Ͷʁʁ
    

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48. …
    

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49. LLDB ίϚϯυʹ͢ΔϝϦοτΛ
    ز͔ͭڍ͓͖͛ͯ·͢
    

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50. LLDB Plugin ʹ͢ΔϝϦοτ
    • σόοά࣌ʹ debug, release Ϗϧυ͕Ͳ͏͔͸ɹɹ
    ؔ܎ͳ͍ (#ifdef DEBUG ϚΫϩͷढ͍)
    • ϓϩδΣΫτ͕มΘͬͯ΋ಉ͡؀ڥͰσόοάͰ͖Δ
    • debug ༻ͷίʔυΛຒΊࠐΉඞཁ͕ͳ͍
    • debug ͷҝʹ private method Λݺͼग़͍ͯ͠ΔͷΛ
    ϦϦʔεϏϧυʹؚΉ৺഑͕ͳ͍
    

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51. ͜Μͳ Plugin ͭ͘Ε͹ศརͰ͢
    • ҰఆִؒͰදࣔ͞Ε͍ͯΔ view શͯʹରͯ͠
    exerciseAmbiguityInLayout Λ࣮ߦ͢ΔίϚϯυɹɹ
    (ambigurous layout ରࡦ)
    • ࣮ػͷϑΝΠϧΛ slack ʹૹ৴͢ΔίϚϯυɹɹɹɹ
    https://gist.github.com/dealforest/702a848ba0a7a64b139985f5cad885f0
    • ݱࡏͷ୺຤ͷঢ়گΛදࣔ͢ΔίϚϯυɹɹɹɹɹɹɹɹɹ
    free diskɺfree memory, ωοτϫʔΫ઀ଓઌ, ɹɹ
    OS όʔδϣϯͳͲ
    

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52. Ͳ͏Ͱ͢ʁʁ
    ΍ͬͯΈͨ͘ͳΓ·͔ͨ͠ʁʁ
    

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53. LLDB Plugin ͷ࡞Γํ͸
    ͜ͷޙϒϩάʹॻ͘ͷͰ
    গʑ͓଴͍ͪͩ͘͞
    

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54. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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