xcode使用lldb的python脚本查看WebKit的WTF::String和Vector等基础类

webkit关于gdb的wiki：http://trac.webkit.org/wiki/GDB

它是自带了gdb和lldb的python脚本的，路径分别在

webkit workingcopy/Tools/gdb/webkit.py 直接看脚本内容http://trac.webkit.org/browser/trunk/Tools/gdb/webkit.py

webkit workingcopy/Tools/lldb/lldb_webkit.py 直接看脚本内容http://trac.webkit.org/browser/trunk/Tools/lldb/lldb_webkit.py

配置lldb初始化时加载python脚本：

1. 当然是checkout出lldb_webkit.py这个文件了，也可直接下载http://trac.webkit.org/export/147046/trunk/Tools/lldb/lldb_webkit.py，放在什么地方都行，现举例是放在用户目录下， 即 ~/

2. 在用户目录下新建文件，命名为“.lldbinit”，注意前面有个点符号哦。

3. .lldbinit的内容为：

command script import ~/lldb_webkit.py

从脚本内容看，支持查看：

• WTF::String
• WTF::StringImpl
• WTF::AtomicString
• WTF::Vector
• WTF::HashTable。 包括HashMap, HashSet等

xcode只有lldb支持了python，所以以下的截图都是lldb的。

这是测试代码：

Vector<String> v;
    v.append("hello");
    v.append("world");
    
    HashMap<String, String> map;
    map.set("h", "hello");
    map.set("w", "world");
    
    AtomicString as = "thanks";

这是terminal的p功能：

(lldb) p v
(WTF::Vector<WTF::String, 0>) $0 = { size = 2, capacity = 16 } {
  (WTF::String) [0] = { length = 5, contents = 'hello' } {
    (WTF::RefPtr<WTF::StringImpl>) m_impl = {
      (WTF::StringImpl *) m_ptr = 0x000000010a45a7d0 { length = 5, is8bit = 1, contents = 'hello' }
    }
  }
  (WTF::String) [1] = { length = 5, contents = 'world' } {
    (WTF::RefPtr<WTF::StringImpl>) m_impl = {
      (WTF::StringImpl *) m_ptr = 0x000000010a45ad80 { length = 5, is8bit = 1, contents = 'world' }
    }
  }
  (size_t) m_size = 2
  (WTF::Vector<WTF::String, 0>::Buffer) m_buffer = {
    (WTF::VectorBufferBase<WTF::String>) WTF::VectorBufferBase<WTF::String> = {
      (WTF::String *) m_buffer = 0x000000010a45ae50 { length = 5, contents = 'hello' }
      (size_t) m_capacity = 16
    }
  }
}
(lldb) p as
(WTF::AtomicString) $1 = { length = 6, contents = 'thanks' } {
  (WTF::String) m_string = { length = 6, contents = 'thanks' } {
    (WTF::RefPtr<WTF::StringImpl>) m_impl = {
      (WTF::StringImpl *) m_ptr = 0x000000010a45b0b0 { length = 6, is8bit = 1, contents = 'thanks' }
    }
  }
}
(lldb) p map
(WTF::HashMap<WTF::String, WTF::String, WTF::StringHash, WTF::HashTraits<WTF::String>, WTF::HashTraits<WTF::String> >) $2 = {
  (WTF::HashMap<WTF::String, WTF::String, WTF::StringHash, WTF::HashTraits<WTF::String>, WTF::HashTraits<WTF::String> >::HashTableType) m_impl = { tableSize = 8, keyCount = 2 } {
    (WTF::String) [0] = { length = 0, contents = '' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
      }
    }
    (WTF::String) [1] = { length = 0, contents = '' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
      }
    }
    (WTF::String) [2] = { length = 0, contents = '' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
      }
    }
    (WTF::String) [3] = { length = 0, contents = '' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
      }
    }
    (WTF::String) [4] = { length = 1, contents = 'w' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x000000010a45af70 { length = 1, is8bit = 1, contents = 'w' }
      }
    }
    (WTF::String) [5] = { length = 5, contents = 'world' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x000000010a45b080 { length = 5, is8bit = 1, contents = 'world' }
      }
    }
    (WTF::String) [6] = { length = 0, contents = '' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
      }
    }
    (WTF::String) [7] = { length = 0, contents = '' } {
      (WTF::RefPtr<WTF::StringImpl>) m_impl = {
        (WTF::StringImpl *) m_ptr = 0x0000000000000000 { length = 0, is8bit = 0, contents = '' }
      }
    }
    (ValueType *) m_table = 0x000000010a45b000
    (int) m_tableSize = 8
    (int) m_tableSizeMask = 7
    (int) m_keyCount = 2
    (int) m_deletedCount = 0
  }
}