C++反汇编揭秘1 – 一个简单C++程序反汇编解析 (Rev. 3) - [C/C++]

淩亂°似流年 2022-08-27 06:00 190阅读 0赞

[http://blog.csdn.net/ATField/archive/2006/11/14/1382694.aspx][http_blog.csdn.net_ATField_archive_2006_11_14_1382694.aspx]

如果想要了解C++ 内部的实现原理，没有什么比观察C++代码对应的汇编代码来的更直接了。本系列主要从汇编角度研究C++代码和汇编的对应关系，揭示C++ 内部的机制和原理。在第一篇文章中我将从一个简单的C++程序着手快速解释一下C++反汇编代码的基本的结构和内容，相当于一个简单的Preview。而在后续的文章中，我将根据不同的Topic，详细解释C++代码对应的反汇编代码。

一个简单的C++ 程序示例如下：

可以直接Debug的时候看到Assembly代码，不过这样获得的代码注释比较少。比较理想的方法是利用VC编译器的一个选项/FAs来生成对应的汇编代码。/FAs还会在汇编代码中加入注释注明和C++代码的对应关系，十分有助于分析。在VS2005中可以这样打开/FAs：

![o_cpp_disasm_1_1.JPG][]

Build代码，可以在输出目录下发现对应的.ASM文件。本文将逐句分析汇编代码和C++的对应关系。

首先是WinMain：

<table style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BACKGROUND: #d9d9d9; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse"> 
 <tbody> 
  <tr> 
   <td style="PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; BORDER-LEFT-COLOR: #e0dfe3; BORDER-BOTTOM-COLOR: #e0dfe3; PADDING-BOTTOM: 0in; WIDTH: 10in; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #e0dfe3"> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">_TEXT SEGMENT</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">_wmain&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PROC</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;ebp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存旧的</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ebp</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; ebp, esp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; ebp</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存当前栈的位置</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;-1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">建立</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">SEH(Structured Exception Handler)</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">链</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; -1</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">表示表头</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">,</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">没有</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">Prev</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;__ehhandler$_wmain&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; SEH</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">异常处理程序的地址</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; eax, DWORD PTR fs:0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; fs:0</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">指向</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">TEB</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">的内容，头</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">4</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">个字节是当前</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">SEH</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">链的地址</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存起来</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sub&nbsp;&nbsp; esp, d8H&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">分配</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">d8H</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">字节的空间</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;ebx</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;esi</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;edi</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; lea&nbsp;&nbsp; edi, DWORD PTR [ebp-e4H]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; 确定局部变量的起始地址。e4H = d8H + 4 * 3</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">，跳过之前建立SEH链所用的3个Push指令所占用的栈的空间，以及sub esp, d8h为局部变量分配的d8H字节空间</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; ecx, 36H&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; 36H*4H=d8H</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">，也就是用</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">36H</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">个</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ccccccccH</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">填满刚才分配的</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">d8H</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">字节空间</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; eax, ccccccccH</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rep stosd</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; eax, DWORD PTR ___security_cookie&nbsp;&nbsp; </span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xor&nbsp;&nbsp; eax, ebp&nbsp;&nbsp;&nbsp; </span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; ebp ^ __security_cookie</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">压栈保存</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; lea&nbsp;&nbsp; eax, DWORD PTR [ebp-0cH]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; ebp-0cH</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">是之前</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">main的起始代码中在堆栈中建立的SEH结构的首地址</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; DWORD PTR fs:0, eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">设置到</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">TEB</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">中作为当前</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">Active</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">的</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">SEH</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">链表末尾</span> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

到此为止栈的内容是这样的：

低地址

<table style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BACKGROUND: #d9d9d9; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse"> 
 <tbody> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">Security cookie after XOR</span> 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      Edi 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      Esi 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      Ebx 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      Local stack: d8H 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      Old fs:0 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      __ehhandler$_wmain 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      ffffffffH 
    </div> </td> 
  </tr> 
  <tr style="HEIGHT: 12.6pt"> 
   <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0in; BORDER-LEFT: windowtext 1pt solid; WIDTH: 193.1pt; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 12.6pt; BACKGROUND-COLOR: transparent"> 
    <div style="MARGIN: 0in 0in 0pt">
      Old ebp 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

高地址

main接着后面调用my\_class的构造函数

接着调用my\_class::method：

之后是析构：

Main函数退出代码如下：

专门用于SEH的子程序。\_\_unwindfunclet$\_wmain$0当异常发生的时候被调，负责进行栈展开，主要是调用析构函数。\_\_ehhandler$\_wmain则是在exception被抛出的时候调用。

My\_class::my\_class构造函数如下。构造函数本质上就是一个全局函数，名字是经过打乱的(Name Mangling)，这样可以和同一Class和其他Class的同名方法区别开来。不同编译器有不同规则，因此不必过于深究。

<table style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BACKGROUND: #d9d9d9; BORDER-LEFT: medium none; BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse"> 
 <tbody> 
  <tr style="HEIGHT: 63.9pt"> 
   <td style="PADDING-RIGHT: 5.4pt; PADDING-LEFT: 5.4pt; BORDER-LEFT-COLOR: #e0dfe3; BORDER-BOTTOM-COLOR: #e0dfe3; PADDING-BOTTOM: 0in; WIDTH: 10in; BORDER-TOP-COLOR: #e0dfe3; PADDING-TOP: 0in; HEIGHT: 63.9pt; BACKGROUND-COLOR: transparent; BORDER-RIGHT-COLOR: #e0dfe3"> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">_TEXT SEGMENT</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">??0my_class@@QAE@XZ PROC</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;ebp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存旧的</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ebp</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; ebp, esp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; ebp</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存当前栈的位置</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sub&nbsp;&nbsp; esp, ccH&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">给栈分配</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ccH</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">个字节</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;ebx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存常用寄存器</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;esi</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;edi</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push&nbsp;ecx</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; lea&nbsp;&nbsp; edi, DWORD PTR [ebp-ccH]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">从分配的位置开始</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; ecx, 33H&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">写</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">33H</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">个</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ccccccccH</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; eax, ccccccccH&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">也就是</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">33H*4H=ccH</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">，正好是分配的大小</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; rep stosd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">从而把整个栈上当前分配的空间用</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ccH</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">填满</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop&nbsp;&nbsp; ecx</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; DWORD PTR [ebp-8], ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">按照约定，一般用</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ECX</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">保存</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">this</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">指针</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">把</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">this</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">存入到</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ebp-8</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">，并不是很必要，因为这是</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">Debug</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">版本</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span> 
    </div> &nbsp; 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">; 10&nbsp;&nbsp; :&nbsp;&nbsp;&nbsp;&nbsp; { </span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">; 11&nbsp;&nbsp; :&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_member = 1;</span> 
    </div> &nbsp; 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; eax, DWORD PTR [ebp-8]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; eax</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">中存放</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">this</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; DWORD PTR [eax], 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; this</span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">的头四个</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">byte</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">是</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">m_member</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">的内容</span> 
    </div> &nbsp; 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">; 12&nbsp;&nbsp; :&nbsp;&nbsp;&nbsp;&nbsp; }</span> 
    </div> &nbsp; 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; eax, DWORD PTR [ebp-8]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">多余的一句话，可以优化掉</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop&nbsp;&nbsp; edi</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop&nbsp;&nbsp; esi</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop&nbsp;&nbsp; ebx</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov&nbsp;&nbsp; esp, ebp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="COLOR: #943634">; </span></span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">恢复</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">esp</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">，因此就算是中间栈运算出错，最后也不会导致灾难性的结果，只要</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">ebp</span> 
     <span style="FONT-SIZE: 10pt; COLOR: #943634">还是正确的</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop&nbsp;&nbsp; ebp</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ret&nbsp;&nbsp; 0</span> 
    </div> 
    <div style="MARGIN: 0in 0in 0pt"> 
     <span style="FONT-SIZE: 10pt">??0my_class@@QAE@XZ ENDP</span> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

My\_class::method的实现如下：

[Link 1]: http://creativecommons.org/licenses/by/3.0/deed.zh
[Link 2]: http://bangzhuzhongxin.blogbus.com/logs/11205960.html
[http_joshuafan.blogbus.com_logs_10066721.html]: http://joshuafan.blogbus.com/logs/10066721.html
[http_blog.csdn.net_ATField_archive_2006_11_14_1382694.aspx]: http://blog.csdn.net/ATField/archive/2006/11/14/1382694.aspx
[o_cpp_disasm_1_1.JPG]: /images/20220824/3a501b4bc04e468a8a060565614b8b81.png