LLDB 和Chisel 使用例子

原创

花花虎? 2021-05-30 21:19:54 ©著作权

文章标签 LLDB IOS 文章分类 iOS 移动开发

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LLDB 和Chisel 使用例子

打印变量

打印数字
```
(lldb) p/d 16 
16
```
16 进制格式
```
(lldb) p/x 16
0x10
```

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

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

管理断点

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

disable 断点

(lldb) br disable 2.1
1 breakpoints disabled.

删除断点

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

打断点

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

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

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

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:]"

打印内部变量

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

打印继承关系

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

其他

当前行数和源码

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