1.什麼是LLDB
LLDB是英文Low Lever Debug的縮寫，是XCode內置的爲我們開發者提供的調試工具；方便開發者對開發問題進行快速有效的解決；
2.LLDB 斷點設置
新建一個Object-C工程，寫了下方代碼，給一個 OC 方法下斷點，運行工程，就可以進入LLDB調試環境
1、使用LLDB中“breakpoint set -n 函數名 ”下斷點
1.在lldb 中輸入給demo1方法下斷點
breakpoint set -n demo1
輸出：
Breakpoint 2: where = LLDB調試`-[ViewController demo1] at ViewController.m:27, address = 0x000000010d8e1be0
表示斷點下入成功
其中：
Breakpoint 2: 表示這是全局的第二個斷點
where = LLDB調試`-[ViewController demo1] at ViewController.m:27,：標示斷點位置和方法名稱
address = 0x000000010d8e1be0：斷點所表示的內存地址
2.給函數下斷點
breakpoint set -n "[ViewController douYinClick:]"
Breakpoint 3: where = LLDB調試`-[ViewController douYinClick:] at ViewController.m:34, address = 0x000000010d8e1c10
2、breakpoint set -l 行數 -f 文件名
輸入：
breakpoint set -l 23 -f ViewController.m
輸出：
Breakpoint 4: where = LLDB調試`-[ViewController touchesBegan:withEvent:] + 77 at ViewController.m:23:5, address = 0x000000010d8e1b8d
3.使用breakpoint set -a 16位的物理地址
這裏我們首先找到16爲物理地址，xcode工具欄Debug ->Debug WorkFlow -> Alawys Show Disassembly進入棧調試找到物理地址0x10d8e1b97；
輸入：
breakpoint set -a 0x10d8e1b97
輸出：
Breakpoint 5: where = LLDB調試`-[ViewController touchesBegan:withEvent:] + 87 at ViewController.m:24:6, address = 0x000000010d8e1b97
4、使用函數全部名稱設置斷點
breakpoint set -F 函數全名
輸入：
breakpoint set -F kuaiShouClick:
5.使用函數局部名稱進行設置斷點
輸入：
breakpoint set -r touchBegan
輸出：
Breakpoint 9: 5 locations.
這個說明是第9組下了斷點，共下了5處斷點，但是我們項目只有一個處實現了，說明給底層函數中也可以使用這種方式下斷點，我們可以使用 breakpoint list進行驗證
輸入：
breakpoint list
輸出：
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 5
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x000000010d8e1b40, resolved, hit count = 5
2: name = 'demo1', locations = 1, resolved = 1, hit count = 4
2.1: where = LLDB調試`-[ViewController demo1] at ViewController.m:27, address = 0x000000010d8e1be0, resolved, hit count = 4
3: names = {'[ViewController douYinClick:]', '[ViewController douYinClick:]'}, locations = 1, resolved = 1, hit count = 0
3.1: where = LLDB調試`-[ViewController douYinClick:] at ViewController.m:34, address = 0x000000010d8e1c10, resolved, hit count = 0
4: file = 'ViewController.m', line = 23, exact_match = 0, locations = 1, resolved = 1, hit count = 3
4.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] + 77 at ViewController.m:23:5, address = 0x000000010d8e1b8d, resolved, hit count = 3
5: address = LLDB調試[0x0000000100001b97], locations = 1, resolved = 1, hit count = 3
5.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] + 87 at ViewController.m:24:6, address = 0x000000010d8e1b97, resolved, hit count = 3
6: name = 'kuaiShouClick', locations = 0 (pending)
7: name = 'kuaiShouClick', locations = 0 (pending)
8: name = 'kuaiShouClick:', locations = 1, resolved = 1, hit count = 0
8.1: where = LLDB調試`-[ViewController kuaiShouClick:] at ViewController.m:37, address = 0x000000010d8e1c60, resolved, hit count = 0
9: regex = 'touchBegan', locations = 5, resolved = 5, hit count = 0
9.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
9.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
9.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
9.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, resolved, hit count = 0
9.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0
這裏我們可以看到第九組共有5出斷點，都是底層使用的方法，並且都包含touchBegan 字段方法名稱
3.LLDB斷點配置
其實斷點配置還有很多，這裏只是簡單的列舉幾個：
- -i <count> (--ignore -count <count>)
輸入：
breakpoint set -F wangZheClick: -i 3
- -o <boolean>只斷住一次
輸入：
breakpoint set -F wangZheClick: -o yes
- -N 給斷點添加別名
輸入：
breakpoint set -F douYinClick: -N douyinBreakPoint
輸出：
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 2
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x0000000105105b40, resolved, hit count = 2
3: name = 'douYinClick:', locations = 1, resolved = 1, hit count = 0
Names:
douyinBreakPoint
3.1: where = LLDB調試`-[ViewController douYinClick:] at ViewController.m:34, address = 0x0000000105105c10, resolved, hit count = 0
- -N 給斷點添加別名
輸入：
breakpoint set -n demo1 -c "i==10"
4.斷點的禁用與啓用和刪除
- 查看斷點列表：breakpoint list
輸入：
breakpoint list
輸出：
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 6
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 6
2: name = 'demo1', locations = 1, resolved = 1, hit count = 5
Condition: i==10
2.1: where = LLDB調試`-[ViewController demo1] at ViewController.m:29, address = 0x00000001094e2be0, resolved, hit count = 5
- 禁用第二組斷點
輸入：
breakpoint disable 2
輸出：
1 breakpoints disabled.
查看下斷點列表，說明第二組斷點還在裏面，只是沒有啓用
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
2: name = 'demo1', locations = 1 Options: disabled
Condition: i==10
2.1: where = LLDB調試`-[ViewController demo1] at ViewController.m:29, address = 0x00000001094e2be0, unresolved, hit count = 5
- 啓用第二組斷點
輸入：
breakpoint enable 2
注意：我在這裏操作的時候都是以組爲單位進行禁用斷點和啓用斷點，因爲一般情況下我們下斷點一組都是隻有一個斷點；
如果是如下情況，我們使用:breakpoint set -r touchBegan,下斷點後，共5處斷點
breakpoint list
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
2: name = 'demo1', locations = 1, resolved = 1, hit count = 5
Condition: i==10
2.1: where = LLDB調試`-[ViewController demo1] at ViewController.m:29, address = 0x00000001094e2be0, resolved, hit count = 5
3: regex = 'touchBegan', locations = 5, resolved = 5, hit count = 0
3.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
3.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
3.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
3.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, resolved, hit count = 0
3.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0
我們只想給其中某一個方法下，可以找到它的編號：例如給[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:]這個方法下斷點；
禁用輸入：
breakpoint disable 3.3
啓用輸入：
breakpoint enable 3.3
- 刪除斷點
1.刪除所有斷點
輸入：
breakpoint delete
輸出：
About to delete all breakpoints, do you want to do that?: [Y/n]
詢問是否刪除 Y
All breakpoints removed. (2 breakpoints)
查看breakpoint list
輸出：No breakpoints currently set.
2.刪除組斷點
輸入：
breakpoint delete 2
輸出：
1 breakpoints deleted; 0 breakpoint locations disabled.
查看breakpoint list
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
3: regex = 'touchBegan', locations = 5, resolved = 5, hit count = 0
3.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
3.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
3.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
3.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, resolved, hit count = 0
3.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0
2.刪除組內斷點
輸入：
breakpoint delete 3.4
輸出：
0 breakpoints deleted; 1 breakpoint locations disabled.
查看Breakpoint list
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB調試/LLDB調試/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB調試`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
3: regex = 'touchBegan', locations = 5, resolved = 4, hit count = 0
3.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
3.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
3.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
3.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, unresolved, hit count = 0 Options: disabled
3.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0
刪除組內斷點的時候，失敗了，查詢後發下組內斷點還是存在的，說明刪除斷點的時候只能按照組進行刪除,
5.查看 LLDB 的其他指令
直接在LLDB 上 輸入 ：help 就可以查看其他的指令了，這裏太多了，就不貼過來了；
可以搜索部分比如：help breakpoint,就是查看 breakpoint下的所有指令。
輸入：
help breakpoint
輸出：
Commands for operating on breakpoints (see 'help b' for shorthand.)
Syntax: breakpoint <subcommand> [<command-options>]
The following subcommands are supported:
clear -- Delete or disable breakpoints matching the specified source
file and line.
command -- Commands for adding, removing and listing LLDB commands
executed when a breakpoint is hit.
delete -- Delete the specified breakpoint(s). If no breakpoints are
specified, delete them all.
disable -- Disable the specified breakpoint(s) without deleting them. If
none are specified, disable all breakpoints.
enable -- Enable the specified disabled breakpoint(s). If no breakpoints
are specified, enable all of them.
list -- List some or all breakpoints at configurable levels of detail.
modify -- Modify the options on a breakpoint or set of breakpoints in
the executable. If no breakpoint is specified, acts on the
last created breakpoint. With the exception of -e, -d and -i,
passing an empty argument clears the modification.
name -- Commands to manage name tags for breakpoints
read -- Read and set the breakpoints previously saved to a file with
"breakpoint write".
set -- Sets a breakpoint or set of breakpoints in the executable.
write -- Write the breakpoints listed to a file that can be read in
with "breakpoint read". If given no arguments, writes all
breakpoints.
For more help on any particular subcommand, type 'help <command> <subcommand>'.
6.斷點的簡寫
b -f ViewController.m -r Clicked: 等同於：breakpoint set --file ViewController.m -r Clicked:
b：breakpoint set-f：--file-n：--name
但是 breakpoint list 、breakpoint disable 等只能簡寫成 break li、break dis ，因爲簡寫的 b 後面默認會帶上 set 的。
這一篇文章主要描述一下LLDB中我們經常使用的斷點調試方式，下一篇文章講下LLDB的進階用法。