Intrducing debug in WWDC2016

WWDC.next

Transcript

1. Intrducing debug in WWDC2016
   2016/07/01 WWDC.next
   @dealforest
   Toshihro Morimoto
   

   View Slide

2. ࣗݾ঺հ
   

   View Slide

3. View Slide

4. WWDC2016 Debug Session
   1. #410 - Visual Debugging with Xcode
   2. #412 - Thread Sanitizer and Static Analysis
   3. #417 - Debugging Tips and Tricks
   

   View Slide

5. WWDC2016 Debug Session
   1. #410 - Visual Debugging with Xcode (100P)
   2. #412 - Thread Sanitizer and Static Analysis (64P)
   3. #417 - Debugging Tips and Tricks (494P)
   

   View Slide

6. WWDC2016 Debug Session
   1. #410 - Visual Debugging with Xcode (100P)
   2. #412 - Thread Sanitizer and Static Analysis (64P)
   3. #417 - Debugging Tips and Tricks (494P)
   

   View Slide

7. ͜Μͳͷ 10 ෼Ͱ
   ঺հͰ͖ΔΘ͚ͳ͍Ͱ͢ΑͶwww
   

   View Slide

8. ͱ͍͏Θ͚Ͱૣ଎͍͖·͢
   

   View Slide

9. LLDB ͜ͱ͸͡Ί
   

   View Slide

10. LLDB ͜ͱ͸͡Ί
    

    View Slide

11. ม਺Λग़ྗ͢Δ
    • p
    • po
    • frame variable
    

    View Slide

12. your app
    LLDB
    Swift Compiler
    inject
    

    View Slide

13. your app
    LLDB
    Swift Compiler
    inject
    p, po ͸͜ͷλΠϓ
    

    View Slide

14. your app
    LLDB
    Swift Compiler
    inject
    p: ΞϓϦଆͰ LLDB ͷ৘ใΛग़ྗ
    po: ΞϓϦଆͰఆٛͨ͠৘ใ(description)Λग़ྗ
    

    View Slide

15. ͨͩ͠ʂʂʂʂ
    

    View Slide

16. inject ʹࣦഊ͢Δέʔε͕
    Swift Ͱ͸ͨ·ʹൃੜ͠·͢
    

    View Slide

17. LLDB ͷΤϥʔϝοηʔδͷΈ
    දࣔ͞Ε·͢
    

    View Slide

18. ͭ·Γ͸࣮ߦ݁Ռ͕
    ಘΒΕͳ͍Θ͚Ͱ͢Ͷ
    

    View Slide

19. ͦΜͳ࣌͸ frame variable Λ
    ࢖͍·͠ΐ͏
    

    View Slide

20. LLDB
    Swift Compiler
    frame variable ͸ LLDB ͷதͰ׬݁͠·͢
    

    View Slide

21. ͜ΕͰͲΜͳঢ়گͰ΋
    ม਺ͷग़ྗ͕ಘΒΕΔΑ͏ʹͳΓ·͢
    

    View Slide

22. ͜Ε͚ͩ஌ͬͱ͍ͯ΋Β͑Ε͹
    ࠷௿ݶ࢖͑Δ͔ͳͱࢥ͍·͢
    

    View Slide

23. Ͱ͸͜Ε͔Βۦ͚଍Ͱ
    ൃද͞Εͨ಺༰Λ
    ΩϟνΞοϓ͍͖ͯ͠·͠ΐ͏
    

    View Slide

24. ม਺Λग़ྗ͢Δ
    • p
    • po
    • frame variable
    • parray
    • poarray
    

    View Slide

25. ม਺Λग़ྗ͢Δ
    • p
    • po
    • frame variable
    • parray
    • poarray
    parray, poarray ͸ C ϙΠϯλ ͷ഑ྻΛදࣔ
    

    View Slide

26. ม਺Λग़ྗ͢Δ
    int count = 5;
    int data[5] = { 1000, 2, 3, 17, 50 };
    int *dataset = data;
    (lldb) p dataset
    (int *) $1 = 0x00007fff5a5bedb0
    (lldb) po dataset
    0x00007fff5a5bedb0
    (lldb) parray 5 dataset
    (int *) $3 = 0x00007fff5a5bedb0 {
    (int) [0] = 1000
    (int) [1] = 2
    (int) [2] = 3
    (int) [3] = 17
    (int) [4] = 50
    }
    

    View Slide

27. ม਺Λग़ྗ͢Δ
    int count = 5;
    int data[5] = { 1000, 2, 3, 17, 50 };
    int *dataset = data;
    

    View Slide

28. ม਺Λग़ྗ͢Δ
    int count = 5;
    int data[5] = { 1000, 2, 3, 17, 50 };
    int *dataset = data;
    (lldb) poarray `count` dataset
    {
    1000
    2
    3
    17
    50
    }
    

    View Slide

29. Objective-C ͷΠϯελϯεΛग़ྗ
    Objective-C Ͱ࡞ΒΕͨΠϯελϯε
    (lldb) po 0x1003183e0
    Enrico, 700 Swift Street, Mountain View, CA
    

    View Slide

30. Objective-C ͷΠϯελϯεΛग़ྗ
    Objective-C Ͱ࡞ΒΕͨΠϯελϯε
    (lldb) po 0x1003183e0
    Enrico, 700 Swift Street, Mountain View, CA
    Swift ͷίʔυ
    (lldb) po 0x1003183e0
    4298212320
    

    View Slide

31. Objective-C ͷΠϯελϯεΛग़ྗ
    Objective-C Ͱ࡞ΒΕͨΠϯελϯε
    (lldb) po 0x1003183e0
    Enrico, 700 Swift Street, Mountain View, CA
    Swift ͷίʔυ
    (lldb) po 0x1003183e0
    4298212320
    (lldb) expr -O --language objc -- 0x1003183e0
    Enrico, 700 Swift Street, Mountain View, CA
    po ͱ expr -O ͸ಉٛͰ͢
    

    View Slide

32. import module
    (lldb) p [NSApplication sharedApplication].undoManager
    error: property ‘undoManager’ not found on object of type ‘id’
    

    View Slide

33. import module
    (lldb) p [NSApplication sharedApplication].undoManager
    error: property ‘undoManager’ not found on object of type ‘id’
    (lldb) p @import AppKit
    (lldb) p [NSApplication sharedApplication].undoManager
    (NSUndoManager * __nullable) $1 = 0x00007fb399629cd0
    

    View Slide

34. auto import module
    (lldb) p [NSApplication sharedApplication].undoManager
    (NSUndoManager * __nullable) $1 = 0x00007fb399629cd0
    

    View Slide

35. auto import module
    (lldb) p [NSApplication sharedApplication].undoManager
    (NSUndoManager * __nullable) $1 = 0x00007fb399629cd0
    ͜ͷػೳΛແޮʹ͢Δ͜ͱ΋Ͱ͖·͢
    (lldb) settings show target.auto-import-clang-modules false
    

    View Slide

36. ΧελϚΠζΛӬଓԽ
    • ~/.lldbinit or ~/.lldbinit-Xcode ʹίϚϯυΛॻ͍
    ͓͚ͯ͹ىಈ࣌ʹ࣮ߦ͞ΕΔ
    • Python ͷϥΠϒϥϦΛ import ͓͚ͯ͠͹
    LLDB ͕ attach ͞Εͨ࣌ʹ͙͢࢖͑Δ
    

    View Slide

37. REPL
    $ swift
    Welcome to Apple Swift version 3.0. Type :help for assistance.
    1> po "Welcome to WWDC.next!!"
    error: repl.swift:2:3: error: consecutive statements on a line must be separated by ';'
    po "Welcome to WWDC.next!!"
    ^
    ;
    1> :po "Welcome to WWDC.next!!"
    "Welcome to WWDC.next!!"
    

    View Slide

38. REPL
    $ swift
    Welcome to Apple Swift version 3.0. Type :help for assistance.
    1> :type lookup Comparable
    protocol Comparable : Equatable {
    @warn_unused_result func <(lhs: Self, rhs: Self) -> Swift.Bool
    @warn_unused_result func <=(lhs: Self, rhs: Self) -> Swift.Bool
    @warn_unused_result func >=(lhs: Self, rhs: Self) -> Swift.Bool
    @warn_unused_result func >(lhs: Self, rhs: Self) -> Swift.Bool
    }
    

    View Slide

39. breakpoint ΋࢖͑·͢
    

    View Slide

40. צͷ͍͍ਓ͸ؾ෇͍͔ͨ΋͠Ε·ͤΜ
    

    View Slide

41. Playgroud Ͱ΋
    LLDB ͕ಈ͘ͷ͔ʂʂʂ
    

    View Slide

42. ͱࢥͬͨਓ΋͍ΔͰ͠ΐ͏
    

    View Slide

43. ࢒೦ͳ͕ΒμϝͰͨ͠
    

    View Slide

44. ͨͩ͠࢖͑Δະདྷ͕
    ΍ͬͯ͘Δ͔΋͠Ε·ͤΜͶ
    

    View Slide

45. REPL
    let value: Int? = 10
    value + 10
    ⚠Value of optional type 'Optional' not unwrapped; did you mean
    to use '!' or '?'?
    

    View Slide

46. REPL
    let value: Int? = 10
    value + 10
    ⚠Value of optional type 'Optional' not unwrapped; did you mean
    to use '!' or '?'?
    (lldb) p Optional(10) + 10
    (Int) $R0 = 20
    Fixit applied, fixed expression was:
    Optional(10)! + 10
    

    View Slide

47. Breakpoint
    • Symbolic Breakpoints
    • ಛఆͷ method, property ʹ step-in ͢Δ
    sif
    • ͲͷόΠφϦ͕ϩʔυ͞Ε͍ͯΔͷ͔
    image list
    • --queue-name (or -q) Ͱಛఆͷ queue ͕ dequeue ͞ΕΔλ
    ΠϛϯάͰ attach Ͱ͖Δ
    

    View Slide

48. Breakpoint
    • ύλʔϯϚονϯάͰ attach ͢Δ͜ͱ͕Ͱ͖Δ
    function໊, ಛఆͷιʔείʔυͳͲ
    

    View Slide

49. Breakpoint
    • ύλʔϯϚονϯάͰ attach ͢Δ͜ͱ͕Ͱ͖Δ
    function໊, ಛఆͷιʔείʔυͳͲ
    // Break here
    (lldb) break set --source-regexp "// Break here" -f main.swift
    

    View Slide

50. Low-Level Debugging
    • Optimized code
    • Third-party code with no debug info
    

    View Slide

51. Low-Level Debugging
    • Optimized code
    • Third-party code with no debug info
    ୭͠΋Ұ౓͸ܦݧ͋Δ͔ͱ͸ࢥ͍·͢
    

    View Slide

52. Low-Level Debugging
    • Optimized code
    • Third-party code with no debug info
    ͭΒ͍Ͱ͢ΑͶ…
    

    View Slide

53. ͜͜Ͱ͸;Ε·ͤΜ͕
    417 - Debugging Tips and Tricks
    ʹৄࡉ͕͋Γ·͢
    

    View Slide

54. State Machine Quick Look
    

    View Slide

55. View Slide

56. Thread Sanitizer (TSan)
    

    View Slide

57. only support
    • 64-bit macOS
    • 64-bit iOS and tvOS simulators
    

    View Slide

58. View Slide

59. Low-Level Debugging
    • Optimized code
    • Third-party code with no debug info
    FPS Performance Gauge
    

    View Slide

60. Low-Level Debugging
    • Optimized code
    • Third-party code with no debug info
    Memory Graph Debugging
    

    View Slide

61. iOSDC Ͱ͜ͷลΓͷࣄΛ࿩͔͢΋͠Ε·ͤΜ
    

    View Slide

62. ·ͱΊ
    ػೳ௥Ճ΋͞Δ͜ͱͳ͕Β
    ࢿྉʹ͸طଘͷ؀ڥͰ΋
    ͙͢ʹ࢖͑Δϊ΢ϋ΢͕
    ͨ͘͞Μॻ͔Ε͍ͯ·͢
    

    View Slide

63. ·ͱΊ
    ࠓ͙͢ʹͰ΋࢖͑ΔͷͰ
    ಡΉͱσόοάϥΠϑ͕
    ޾ͤʹͳΔ͔΋͠Ε·ͤΜͶ
    

    View Slide

64. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

    View Slide