一简单c++程序之反汇编

   
   
   

#include<iostream>
    
    
    
using namespace std;
    
    
    
class point3d;
    
    
    
class point2d;
    
    
    
class point3d
    
    
    
{
    
    
    
private:int x; int y; int z;
    
    
    
public:
    
    
    
 point3d(int a = 0, int b = 0, int c = 0) :x(a), y(b), z(c) {}
    
    
    
};
    
    
    
class point2d
    
    
    
{
    
    
    
 int a;
    
    
    
 int b;
    
    
    
public:
    
    
    
 point2d(int x=0,int y=0):a(x),b(y){}
    
    
    
 operator point3d()
    
    
    
 {
    
    
    
 return{ a,b,0 };
    
    
    
 }
    
    
    
};
    
    
    
int main()
    
    
    
{
    
    
    
 point2d z;
    
    
    
 point3d q = z;
    
    
    
 return 0;
    
    
    
 
    
    
    
}
   
   
   

反汇编后

point 2d z:(将调用构造函数

push 0(压入2个参数罢了)

push 0

lea ecx,[z] (将z对象的地址保存到ecx中)

call  point2d::point2d (0C01348h)  

mov   dword ptr [this],ecx   .将ecx(z对象的地址).保存到this指针当中

mov   eax,dword ptr [this]  .将z对象的地址赋给eax

mov ecx,dword ptr [x]; 将变量x的值取出来保存到ecx中

mov dword ptr [eax],ecx..将ecx=0赋给对象z的低4位(也就是a)

mov eax,dword ptr [this].将对象的地址赋给eax

mov ecx,dword ptr [y] 将变量y的值给ecx

mov dword ptr [eax+4],ecx 将y的值赋给高4位对象的地址(也就是b)

mov eax,dword ptr [this],将对象的地址给eax作为返回值

point3d q =z;

   
   
   

008538B4 lea eax,[q] ;将q的地址赋给eax
    
    
    
008538B7 push eax ;压栈.作为参数
    
    
    
008538B8 lea ecx,[z] ;将z的地址赋给ecx
    
    
    
008538BB call point2d::operator point3d (085133Eh) 
   
   
   

   
   
   

00853380 push ebp 
    
    
    
00853381 mov ebp,esp 
    
    
    
00853383 sub esp,0CCh 
    
    
    
00853389 push ebx 
    
    
    
0085338A push esi 
    
    
    
0085338B push edi 
    
    
    
0085338C push ecx 
    
    
    
0085338D lea edi,[ebp-0CCh] 
    
    
    
00853393 mov ecx,33h 
    
    
    
00853398 mov eax,0CCCCCCCCh 
    
    
    
0085339D rep stos dword ptr es:[edi] 
    
    
    
0085339F pop ecx ;
    
    
    
008533A0 mov dword ptr [this],ecx ;将 point2d z的地址赋给了this指针
    
    
    
 return{ a,b,0 };
    
    
    
008533A3 push 0 ;0压栈
    
    
    
008533A5 mov eax,dword ptr [this] 
    
    
    
008533A8 mov ecx,dword ptr [eax+4] ;将z的a变量的值赋给ecx
    
    
    
008533AB push ecx ;ecx压栈
    
    
    
008533AC mov edx,dword ptr [this] 
    
    
    
008533AF mov eax,dword ptr [edx] ;将a的值赋给了eax中 
    
    
    
008533B1 push eax ;eax压栈
    
    
    
008533B2 mov ecx,dword ptr [ebp+8] ;取出q的地址
    
    
    
008533B5 call point3d::point3d (0851357h) ;point3d(一个q的地址.参数.3个变量参数)
    
    
    
008533BA mov eax,dword ptr [ebp+8] ;将q的地址取出来.作为返回值
    
    
    
 }
   
   
   

来自为知笔记(Wiz)