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
2. ࣗݾ঺հ
3. Crying DFTDebugScreenshot cocoapods-browser Tuna
4. ͓ئ͍
5. LLDB ͷ࿩Λ͢Δͱ λΠϜϥΠϯ͕͓ͱͳ͘͠ͳΓ ޙͰ΁͜Ή͜ͱʹͳΔͷͰ ͳΜͰ΋͍͍ͷͰͭͿ΍͍͍ͯͩ͘͞
6. 402 Whats's new in LLDB Έ·͔ͨ͠ʁʁ
7. ຖ೥ LLVM ͷ࠷దԽͷ࿩͕ ͸͍͍ͬͯͨɻɻɻ (ڈ೥ͩͱ PGO)
8. ͱ͜Ζ͕ɺࠓ೥͸ ηογϣϯͱ͓ͯ͠ LLDB ͷ࿩
9. ૉ੖Β͍͠ʂʂʂ
10. ·ͣ཈͓͑ͯ͘ϙΠϯτʂ p, po ͸ alias Έ͍ͨͳ΋ͷ
11. breakpoint breakpoint set -E swift -N allThrows • ݴޠαϙʔτ • lldbinit ͰॳظઃఆͰ͖ΔΑ͏ʹͳͬͨ
12. breakpoint ~/.lldbinit breakpoint set -n malloc -N memory breakpoint set -n free -N memory breakpoint disable memory (lldb) breakpoint enable memory
13. formatter i = 10 (lldb) p/x i (lldb) expression -format hex -- i (lldb) frame variable --format hex i (Int) $R2 = 0x000000000000000a
14. formatting models
15. formatting models • `frame variable` ͸ pure LLDB ͷ৘ใΛग़ྗ • `p` ͸ eval ͨ݁͠ՌΛ LLDB format Ͱग़ྗ • `po` ͸ eval ͨ݁͠ՌΛݴޠຖʹΑͬͯ ࠷దͳ΋ͷΛग़ྗ (objc Ͱ͍͏ description)
16. runtime (lldb) po for i in 1...3 { print(i) } 1 2 3
17. It’s All Automatic!!
18. It’s All Automatic!! in Swift…
19. ҆৺͍ͯͩ͘͠͞
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 ✘
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 ✔
23. only Swift
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" } }
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·͢
26. protocol 4XJGU
     4XJGU
     1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF  $VTUPN3FqFDUBCMF
27. protocol 4XJGU
     4XJGU
     1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU  $VTUPN3FqFDUBCMF --%#
    QP
28. protocol 4XJGU
     4XJGU
     1SJOUBCMF $VTUPN4USJOH$POWFSUJCMF QSJOU %FCVH1SJOUBCMF $VTUPN%FCVH4USJOH$POWFSUJCMF EFCVH1SJOU  $VTUPN3FqFDUBCMF --%#
    QP
29. ͦΕͧΕݟ͍͖ͯ·͠ΐ͏
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" } }
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")
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" } }
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
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" } }
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"
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!!!!
37. ͱ͸͍͑ LLDB ্Ͱ͔͠࢖͑ͳ͍
38. ͱ͍͏͜ͱ͸…
39. break ͠ͳ͍ͱ࢖͑ͳ͍ͱ͔…(ry
40. https://github.com/dealforest/Tuna
41. break ͠ͳ͍ breakpoint Λ ؆୯ʹઃఆͰ͖·͢
43. Swift 2 Λར༻͢Δࡍ͸ɹɹɹɹɹɹ ͔ͳΓ޾ͤʹͳΕΔΑ
44. Objective-C Ͱ΋޾ͤʹͳΕ·͢
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/
46. ·ͱΊ LLDB ΋৭ʑਐԽͯ͠ΔͷͰ ৮ͬͯΈΔͱͨͷ͍͠Α
47. ·ͱΊ Tuna Λ࢖ͬͯ human readable ͳ ग़ྗͰσόοάΛ͠·ͤΜ͔ʁ
48. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠