iOS.Debug.LLDB1

0. lldb的帮助

(lldb) help 

显示lldb的命令

(lldb) help command

显示某个命令的帮助

(lldb) help command subcommand

显示命令的子命令的帮助

1. 使用lldb的断点(breakpoint)

1.1 通过在IDE中在每行代码前点击进行添加断点

1.2 在Console中使用breakpoint命令来设置断点

在App Run之后，"Debug"->"Pause" 菜单项使App暂停，此时Console出现 "(lldb)" 提示符(如下)：

(lldb) breakpoint set -r "didSelectRow"

以上语句添加了一个正则表达式断点，为每个含有"didSelectRow"的方法添加一个断点。Ref[3]

(lldb) help breakpoint set

该语句可以查看"breakpoint set"的帮助。

(lldb) breakpoint set -o -r "didSelectRow"

flag -o: 

  -o ( --one-shot )

            The breakpoint is deleted the first time it causes a stop.

 

1.3 为属性添加断点

查看某个属性什么时候被使用，可以直接在下面的这行设置断点。

@property (assign, nonatomic) CGPoint center;

 

2. watchpoint  

A set of commands for operating on watchpoints.

Ref[9] Ref[1.3]

watchpoint：观察某个变量的值，当发生对该变量的写操作时，就会停下来。

(lldb) watchpoint set variable cityId

 

3. Debug UI 

3.1 方法recursiveDescription的使用

Ref[7]

3.2 lldb

Ref[6]

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Reference

1. lldb和GDB命令对照

1.1 http://lldb.llvm.org/lldb-gdb.html

1.2 http://lldb.llvm.org/docs.html

1.3 http://lldb.llvm.org/tutorial.html (ToRead)

2. WWDC 2012 Session 415 Debugging with LLDB

3. Navigating and discovering an iOS codebase using lldb

https://medium.com/ios-os-x-development/navigating-and-discovering-a-code-base-using-lldb-bca7c10115cf

4. Technical Note TN2239: iOS Debugging Magic (ToRead)

https://developer.apple.com/library/ios/technotes/tn2239/_index.html#//apple_ref/doc/uid/DTS40010638-CH1-SECTION39%23Intel%2032-Bit

5. iOS ABI Function Call Guide (ToRead)

https://developer.apple.com/library/ios/documentation/Xcode/Conceptual/iPhoneOSABIReference/Introduction/Introduction.html

6. Dancing in the Debugger — A Waltz with LLDB (ReadAgain)

7. Output view hierarchy in LLDB

http://shaunseo.com/output-view-hierarchy/

http://jeffreysambells.com/2013/01/24/debugging-layouts-with-recursive-view-descriptions-in-xcode

http://stackoverflow.com/questions/5150186/how-do-i-inspect-the-view-hierarchy-in-ios

Debug Area Help

https://developer.apple.com/library/ios/recipes/xcode_help-debugger/using_view_debugger/using_view_debugger.html

8. Debugging: A Case Study (AAAAA)  (ToRead)

http://www.objc.io/issue-19/debugging-case-study.html

9. How do I have a breakpoint get triggered if an instance variable in the class has its value changed?

(未完待续)

10. More than po: Debugging in LLDB (AAAA+) (ToRead)

https://www.slideshare.net/micheletitolo/more-than-po-debugging-in-lldb-78570000