Fancy debug tips with LLDB

An introduction about how to use LLDB like a boss.

Transcript

1. DEBUG 蕕䌷瞲ܖ ᮎ犚፡蚏㬵ṛ羷ጱLLDBಋ玊 Pofat
2. LLDB膏౯ҁጱ獮獋ଙ҂
6. Compiling was like…
7. 矦کSwift 盅…
8. Print Commands • p , print, call : expression —
 
 • po: expression -O —
 
 

9. Not Only ‘Print Commands’
10. 婘䌃کࠔӞ蟴䌘ܨݢ • 犥ӥ獋ᘏ缛㰷
 
 
 

11. ݢਯޞ虋碍 $樄毣ԏ虋碍ݢਂࣁෝ lldb ጱ绚樌
12. ݢਯޞ虋碍
13. 襑ᥝ瞲ਧࣳ獨
14. 襑ᥝ瞲ਧࣳ獨 ObjC Swift
15. 窕纷矒ګ
16. 窕纷矒ګ
17. thread backtrace
18. 瑽ᛔ http://condor.depaul.edu/slytinen/406s16/ch3.html
19. 瑽ᛔ http://condor.depaul.edu/slytinen/406s16/ch3.html
20. Frame
21. Breakpoints • -n : func or symbol name
 
 
 
 • li : list all breakpoints
 
 

22. help & apropos
23. Who did this?
24. Print? Think again!
25. Print? Think again! 暱࿆硲Ԫ֦碁מ牫
 กॠᥝӤ娄牧merge盅ጱcode 犋Ꭳ螇ெ讕ԧ
 薟䌃ԧ礓㮆 customs view ጱ _layer
27. Print? Think again! Watchpoint
28. Better way to log
29. Better way to log maybe • Breakpoints will minimize the affect to flow • Need a way to import/export breakpoints
 
 

30. UI 砺֢ - present VC
31. UI 砺֢ - view hierarchy
32. Viva la Python
33. .lldbinit ~/command.py ~/.lldbinit
34. Chisel
35. Chisel • border
 
 
 
 
 
 
 
 
 

36. Chisel • visualize
 
 
 
 
 
 
 
 
 

37. Chisel • bmessage
 
 
 
 
 
 
 
 
 

38. Chisel in Swift context • error: error: use of undeclared identifier ‘CGFloat' • CGFloat is defined by macro in objc. In Swift, it’s not.

39. Target ~/.lldbinit
40. 瑽 by David Lin
41. Image lookup
44. Image lookup • ݢತᐺ磪 API • 犖ݢࣁ lldb 愊狶 method swizzling
 
 
 

45. Image lookup • ݢತᐺ磪 API • 犖ݢࣁ lldb 愊狶 method swizzling
 
 
 

46. Registers • $rip : Current instruct pointer • $rdi: First argument • $rsi, $rdx, $rcx, $R8, $R9: Second, third, forth, fifth and sixth arguments • Others will be on stack
47. Registers • $rip : Current instruct pointer • $rdi: First argument • $rsi, $rdx, $rcx, $R8, $R9: Second, third, forth, fifth and sixth arguments • Others will be on stack
48. Registers • $rsp : head of current frame ( head is smaller than bottom) • $rbp: bottom of current frame • $rax: Return register
49. Registers 瑽ᛔ http://condor.depaul.edu/slytinen/406s16/ch3.html
50. 瑽ᛔ http://condor.depaul.edu/slytinen/406s16/ch3.html
51. Witness “Witness Table”
52. Witness “Witness Table” legs: 8 heads: 2 Metadata Witness Table
53. Witness “Witness Table” legs: 8 heads: 2 Metadata Witness Table walk()
54. Output all current state
55. 薹硯֦ጱᨗᚣ毣
56. 獊ᶎcommand line ࠩ
59. Which one is better?
60. Reference • Dancing in the Debugger - A waltz with LLDB • ဤ䋊ҁ盄羊䋿ጱӾ㾴硽䋊翕ᒊ҂ • WWDC 2014 Session 410 : Advanced Debugging in LLDB
61. 眤蘛ݱ֖