New Feature & Tips in LLDB

WWDC2015 情報共有会

Transcript

1. New Feature & Tips in LLDB
   2015/07/07 WWDC2015 ৘ใڞ༗ձ
   @dealforest
   Toshihiro Morimoto
   

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2. ࣗݾ঺հ
   

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3. Crying
   DFTDebugScreenshot
   cocoapods-browser
   Tuna
   

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4. ͓ئ͍
   

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5. LLDB ͷ࿩Λ͢Δͱ
   λΠϜϥΠϯ͕͓ͱͳ͘͠ͳΓ
   ޙͰ΁͜Ή͜ͱʹͳΔͷͰ
   ͳΜͰ΋͍͍ͷͰͭͿ΍͍͍ͯͩ͘͞
   

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6. 402 Whats's new in LLDB
   Έ·͔ͨ͠ʁʁ
   

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7. ຖ೥ LLVM ͷ࠷దԽͷ࿩͕
   ͸͍͍ͬͯͨɻɻɻ
   (ڈ೥ͩͱ PGO)
   

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8. ͱ͜Ζ͕ɺࠓ೥͸
   ηογϣϯͱ͓ͯ͠ LLDB ͷ࿩
   

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9. ૉ੖Β͍͠ʂʂʂ
   

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10. ·ͣ཈͓͑ͯ͘ϙΠϯτʂ
    p, po ͸ alias Έ͍ͨͳ΋ͷ
    

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11. breakpoint
    breakpoint set -E swift -N allThrows
    • ݴޠαϙʔτ
    • lldbinit ͰॳظઃఆͰ͖ΔΑ͏ʹͳͬͨ
    

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12. breakpoint
    ~/.lldbinit
    breakpoint set -n malloc -N memory
    breakpoint set -n free -N memory
    breakpoint disable memory
    (lldb) breakpoint enable memory
    

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13. formatter
    i = 10
    (lldb) p/x i
    (lldb) expression -format hex -- i
    (lldb) frame variable --format hex i
    (Int) $R2 = 0x000000000000000a
    

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14. formatting models
    

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15. formatting models
    • `frame variable` ͸ pure LLDB ͷ৘ใΛग़ྗ
    • `p` ͸ eval ͨ݁͠ՌΛ LLDB format Ͱग़ྗ
    • `po` ͸ eval ͨ݁͠ՌΛݴޠຖʹΑͬͯ
    ࠷దͳ΋ͷΛग़ྗ (objc Ͱ͍͏ description)
    

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16. runtime
    (lldb) po for i in 1...3 { print(i) }
    1
    2
    3
    

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17. It’s All Automatic!!
    

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18. It’s All Automatic!!
    in Swift…
    

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19. ҆৺͍ͯͩ͘͠͞
    

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21. Xcode 6.x
    :PVS$PEF OBNFT .Z'VOD
    .Z7JFX ✔
    4%,'VODUJPOT /4-PH /4.BLF3FDU ✘
    4%,$MBTTFT /47JFX /4"QQMJDBUJPO ✔
    4%,$POTUBOUT /4"4$**4USJOH&ODPEJOH ✔
    .BDSPT */5@."9 ."9
    ✘
    

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22. Xcode 7.x
    :PVS$PEF OBNFT .Z'VOD
    .Z7JFX ✔
    4%,'VODUJPOT /4-PH /4.BLF3FDU ✔
    4%,$MBTTFT /47JFX /4"QQMJDBUJPO ✔
    4%,$POTUBOUT /4"4$**4USJOH&ODPEJOH ✔
    .BDSPT */5@."9 ."9
    ✔
    

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23. only Swift
    

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24. type lookup
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    

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25. type lookup
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    (lldb) type lookup Hoge
    struct Hoge : HogeProtocol {
    let a: Swift.String
    let b: Swift.String
    let c: Swift.String
    func aa()
    func ab()
    func ac()
    func hoge() -> Swift.String
    init(a: Swift.String, b:
    Swift.String, c: Swift.String)
    }
    (lldb) type lookup HogeProtocol
    protocol HogeProtocol {
    func hoge() -> Swift.String
    }
    protocol extension ΋͋Ε͹Ͱ·͢
    

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26. protocol
    4XJGU 4XJGU
    1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF
    %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF
    $VTUPN3FqFDUBCMF
    

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27. protocol
    4XJGU 4XJGU
    1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU
    %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU
    $VTUPN3FqFDUBCMF --%# QP
    
    

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28. protocol
    4XJGU 4XJGU
    1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU
    %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU
    $VTUPN3FqFDUBCMF --%# QP
    
    

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29. ͦΕͧΕݟ͍͖ͯ·͠ΐ͏
    

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30. print
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    

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31. print
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    let hoge = Hoge(
    a: “aaaaa",
    b: “bbbbb",
    c: “ccccccccc"
    )
    print(hoge)
    ——————————————————————————————
    > Sample.Hoge(a: "aaaaa", b:
    "bbbbb", c: “ccccccccc")
    

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32. debugPrint
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    

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33. debugPrint
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    let hoge = Hoge(
    a: “aaaaa",
    b: “bbbbb",
    c: “ccccccccc"
    )
    debugPrint(hoge)
    ——————————————————————————————
    > Sample.Hoge(a: "aaaaa", b:
    "bbbbb", c: “ccccccccc")
    ΧελϚΠζ͠ͳ͍ݶΓجຊಉ͡
    

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34. (lldb) po
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    

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35. (lldb) po
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    let hoge = Hoge(
    a: “aaaaa",
    b: “bbbbb",
    c: “ccccccccc"
    )
    ——————————————————————————————
    (lldb) po hoge
    ▿ Sample.Hoge
    - a : "aaaaa"
    - b : "bbbbb"
    - c : "ccccccccc"
    

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36. (lldb) po
    protocol HogeProtocol {
    func hoge() -> String
    }
    struct Hoge: HogeProtocol {
    let a: String
    internal let b: String
    private let c: String
    func aa() { }
    internal func ab() { }
    private func ac() { }
    func hoge() -> String {
    return "hoge"
    }
    }
    let hoge = Hoge(
    a: “aaaaa",
    b: “bbbbb",
    c: “ccccccccc"
    )
    ——————————————————————————————
    (lldb) po hoge
    ▿ Sample.Hoge
    - a : "aaaaa"
    - b : "bbbbb"
    - c : "ccccccccc"
    human
    readable!!!!
    

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37. ͱ͸͍͑ LLDB ্Ͱ͔͠࢖͑ͳ͍
    

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38. ͱ͍͏͜ͱ͸…
    

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39. break ͠ͳ͍ͱ࢖͑ͳ͍ͱ͔…(ry
    

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40. https://github.com/dealforest/Tuna
    

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41. break ͠ͳ͍ breakpoint Λ
    ؆୯ʹઃఆͰ͖·͢
    

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43. Swift 2 Λར༻͢Δࡍ͸ɹɹɹɹɹɹ
    ͔ͳΓ޾ͤʹͳΕΔΑ
    

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44. Objective-C Ͱ΋޾ͤʹͳΕ·͢
    

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45. Tips
    • ηογϣϯຖͷ hisotry ͩͬͨͷ͕
    stop / start ͯ͠΋࢒ΔΑ͏ʹͳͬͨ
    • ~/.lldbinit-Xcode ΛΈͳ͘ͳͬͨ
    • all exception breakpoint
    Debugger command `po $arg1`Λ͠ͱ͚͹ fatal
    error message ͕ΈΕΔΑ
    http://natashatherobot.com/xcode-debugging-trick/
    

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46. ·ͱΊ
    LLDB ΋৭ʑਐԽͯ͠ΔͷͰ
    ৮ͬͯΈΔͱͨͷ͍͠Α
    

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47. ·ͱΊ
    Tuna Λ࢖ͬͯ human readable ͳ
    ग़ྗͰσόοάΛ͠·ͤΜ͔ʁ
    

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48. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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