LLDB

Transcript

1. LLDB Khoa Pham - 2359 Media

2. LLDB Home page http://lldb.llvm.org/ LLDB is an open-source debugger that

   features a REPL, along with C++ and Python plugins

3. Menu - Command - Use cases - Python - Chisel

   - Standalone

4. Command

5. Command - help Information on any command help print help

   thread continue help help

6. Command - print Print value print a print self

7. Command Prefix matching print, prin, pri, p expression, e Can’t

   use pr (print or process?)

8. Command $ variable Anything starting with a dollar sign is

   in LLDB’ s namespace and exists to help you print $0 + 7

9. Command - expression Evaluate an expression (ObjC++ or Swift) in

   the current program context, Modify values in the program expression $0 = 10 e $0 = 10

10. Command - print 'print' is an abbreviation for 'expression --'.

    Use -- to signify the end of the flags and the beginning of the input e --location -- -count

11. Command - print object See the description method of an

    object e -O -- aString po aString

12. Command - variable The variable must start with a dollar

    sign e NSInteger $b = 10; p $b + a

13. Command - flow Continue process continue, continue, c Step over

    thread step-over, next, n

14. Command - flow Step into thread step-in, step, s Step

    out thread step-out, finish

15. Command - thread return Executes the return command, jumping out

    of the current stack frame thread return YES

16. Breakpoint List breakpoints br li Create breakpoints br set -f

    ViewController.m 39

17. Use cases Find targets of a button po [self.myButton allTargets]

18. Use cases See the frame po self.view.frame e @import UIKit

    po self.view.frame

19. Use cases Change background color without continue e self.view.backgroundColor =

    [UIColor greenColor] e (void)[CATransaction flush]

20. Use cases Watch variable wivar self _number

21. Python LLDB has full, built-in Python support. If you type

    script in LLDB, it will open a Python REPL

22. .lldbinit Executed every time LLDB starts command script import /path/to/fblldb.py

23. Chisel brew update brew install chisel # ~/.lldbinit command script

    import /path/to/fblldb.py

24. Standalone Using LLDB as a Standalone Debugger

25. References - Getting Started with LLDB - Dancing in the

    Debugger — A Waltz with LLDB - Video Tutorial: Using LLDB in iOS - Navigating and discovering an iOS codebase using lldb - chisel