魅せるデバッグ技術

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

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ࣗݾ঺հ

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Works

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(ͭд⊂)ŠƄŢŠƄŢ

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ʢʀƅЧƅʣ …ʂʁ

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ొஃऀ͕ޙ൒Λ઎ΊΔͱ͍͏๫ڍw

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ັͤΔσόοάٕज़

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ͯ͞ɺօ͞Μ ͜͏͍͏৔߹Ͳ͏͠·͔͢ʁʁ

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౰વ͜Εʹؾ͍ͮͨҙࣝͷߴ͍ ͋ͳͨ͸σόοάΛ։࢝͠·͢

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ϩάΛ࢓ࠐΜͰ…

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࠶ىಈʂ

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(ͭд⊂)ŠƄŢŠƄŢ

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※ ຊਓͷڐՄ͸ಘ͍ͯ·͢

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Α͠ɺ࣍ʹ࠶ݱͨ͠Βௐ΂Α͏…

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ϓϦϯτσόοά͋Δ͋ΔͰ͢Ͷ

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࢓ํͳ͍ͷͰ೴಺σόοά։࢝

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

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શવΘ͔Γ·ͤΜͶ

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ͦΜͳ࣌ͦ͜ LLDB ͷग़൪Ͱ͢

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LLDB ͳΒͦͷλΠϛϯάͰͷ ৘ใΛऔಘ͢Δ͜ͱ͕Ͱ͖·͢

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େݩͷը૾͋Δ? ϒϥ΢βͰ௚઀ͦͷ URL Λ։͍͍ͯͩ͘͞w

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

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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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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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͍͔͕Ͱ͔͢ʁʁ

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গ͠͸ঢ়گ͕೺ѲͰ͖ͨ͸ͣͰ͢

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Ұ౓͚ͩͳΒ·ͩ͠΋ ͳΜͲ΋ಉ͜͡ͱ͢ΔͱͳΔͱ…

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ϥΠϒϥϦʹ͢Δͷ΋ͳ…

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࢓ํͳ͍ ͦ͏͍͏Ϋϥε࡞Δ͔

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ଞͷϓϩδΣΫτͰ΋࢖͍͍ͨͳ

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ίϐϖ

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ͦ͏͢Δͱ ϓϩμΫτͱؔ܎͕ͳ͍ίʔυ͕ ૿͍͖͑ͯ·͢

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͔͠΋ϓϩδΣΫτຖʹ มΘͬͯΓ͢Δͱ…

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Φϫλ ʘ(^o^)ʗ

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LLDB ͷ Plugin ʹ͢Ε͹͍͍Μͩʂ

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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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Ͳ͏Ͱ͔͢ʁʁ ͜ΜͳͷϖΞϓϩͰ͞ΕͨΒ

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͓͓͓͓͓͓͓ʂʂʂʂʂ Έ͍ͨʹͳͬͪΌ͍·ͤΜ͔ʁʁ

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ͳΓ·͢ΑͶʁʁ

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Ͷʁʁ

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…

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LLDB ίϚϯυʹ͢ΔϝϦοτΛ ز͔ͭڍ͓͖͛ͯ·͢

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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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͜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