LLDB 和Chisel 使用例子

打印变量

1. 打印数字

   (lldb) p/d 16
   16
   

2. 16 进制格式

   (lldb) p/x 16
   0x10
   

3. 2 进制格式

   (lldb) p/t 16
   0b00000000000000000000000000010000
   (lldb) p/t (char)16
   0b00010000
   

声明变量

(lldb) e int $a = 2
(lldb) p $a * 19
38
(lldb) e NSArray *$array = @[ @"Saturday", @"Sunday", @"Monday" ]
(lldb) p [$array count]
2

流程控制

1. continue
   continue 或 c
2. step over，执行一行代码
   next 或 n
3. step into
   step 或 s
4. step out
   thread step-out 或 finish
5. 从当前函数返回
   thread return

管理断点

1. 查看所有断点

   (lldb) br list
   Current breakpoints:
   1: file = '/testStringIndex/testStringIndex/ViewController.m', line = 73, exact_match = 0, locations = 1, resolved = 1, hit count = 1
   
     1.1: where = testStringIndex`-[ViewController configureSections] + 261 at ViewController.m:73, address = 0x000000010de75515, resolved, hit count = 1 
   
   2: file = '/testStringIndex/testStringIndex/ViewController.m', line = 31, exact_match = 0, locations = 1, resolved = 1, hit count = 1
   
     2.1: where = testStringIndex`-[ViewController viewDidLoad] + 701 at ViewController.m:31, address = 0x000000010de74f3d, resolved, hit count = 1
   

2. disable 断点

   (lldb) br disable 2.1
   1 breakpoints disabled.
   

3. 删除断点

   (lldb) br delete 1.1
   0 breakpoints deleted; 1 breakpoint locations disabled.
   

打断点

1. 指定文件指定行数打断点

   (lldb) br set  -f ViewController.m -l 76
   Breakpoint 2: where = testStringIndex`-[ViewController configureSections] + 451 at ViewController.m:77, address = 0x000000010eff15d3
   (lldb) b ViewController.m:79
   Breakpoint 3: where = testStringIndex`-[ViewController configureSections] + 526 at ViewController.m:79, address = 0x000000010eff161e
   

2. 在符号（C语言函数）上打断点

   (lldb) b isEven
   Breakpoint 3: where = DebuggerDance`isEven + 16 at main.m:4, address = 0x000000010a3f6d00
   (lldb) br s -F isEven
   Breakpoint 4: where = DebuggerDance`isEven + 16 at main.m:4, address = 0x000000010a3f6d00
   

3. 在 OC 函数上打断点

   (lldb) breakpoint set -F "-[NSArray objectAtIndex:]"
   
   Breakpoint 4: where = CoreFoundation`-[NSArray objectAtIndex:], address = 0x000000010fbb7570
   Breakpoint 5: where = CoreFoundation`-[NSArray objectAtIndex:], address = 0x000000010fbb7570
   (lldb) b -[NSArray objectAtIndex:]
   
   Breakpoint 6: where = CoreFoundation`-[NSArray objectAtIndex:], address = 0x000000010fbb7570
   Breakpoint 7: where = CoreFoundation`-[NSArray objectAtIndex:], address = 0x000000010fbb7570
   (lldb) breakpoint set -F "+[NSSet setWithObject:]"
   
   Breakpoint 8: where = CoreFoundation`+[NSSet setWithObject:], address = 0x000000010fadd5d0
   Breakpoint 9: where = CoreFoundation`+[NSSet setWithObject:], address = 0x000000010fadd5d0
   (lldb) b +[NSSet setWithObject:]
   
   Breakpoint 10: where = CoreFoundation`+[NSSet setWithObject:], address = 0x000000010fadd5d0
   Breakpoint 11: where = CoreFoundation`+[NSSet setWithObject:], address = 0x000000010fadd5d0
   

更新界面

在 Chisel 中有一个命令，叫做 caflush，来渲染。

(lldb) e (void)[$myView setBackgroundColor:[UIColor blueColor]]
(lldb) e (void)[CATransaction flush] //渲染

Chisel 的命令

1. 非重写方法的符号断点

   (lldb) bmessage -[MyViewController viewDidAppear:]
   Setting a breakpoint at -[UIViewController viewDidAppear:] with condition (void*)object_getClass((id)$rdi) == 0x000000010e2f4d28
   Breakpoint 1: where = UIKit`-[UIViewController viewDidAppear:], address = 0x000000010e11533c
   

   MyViewController 并没有实现这个方法。

   (lldb) help bmessage
   For more information run 'help bmessage' Expects 'raw' input (see 'help
   raw-input'.)

   Syntax: bmessage
   Set a breakpoint for a selector on a class, even if the class itself doesn't
   override that selector. It walks the hierarchy until it finds a class that does
   implement the selector and sets a conditional breakpoint there.

   Arguments:
   ; Type: string; Expression to set a breakpoint on, e.g. "-[MyView
   setFrame:]", "+[MyView awesomeClassMethod]" or "-[0xabcd1234 setFrame:]"

2. 打印内部变量

   (lldb) pinternals self
   (ViewController) $14 = {
     _allStrings = 0x000060800005cec0 @"15 elements"
     _tableView = 0x00007fd27901fe00
     _sectionsArray = nil
   _collation = nil
   }
   

3. 打印继承关系

   (lldb) pclass self
   ViewController
      | UIViewController
      |    | UIResponder
      |    |    | NSObject
   

其他

1. 当前行数和源码

   (lldb) frame info
   frame #0: 0x000000010704e515 testStringIndex`-[ViewController configureSections](self=0x00007fb3c8006160, _cmd="configureSections") at ViewController.m:73
   

2. 查看内存

   (lldb) x/4c $str
   0x7fd04a900040: monk