一簡單c++程序之反匯編

   
   
   
           

    
    
    
            
#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;
    
    
    
            
 
    
    
    
            
}
   
   
   
           

反匯編后

point 2d z:(將調用構造函數

push 0(壓入2個參數罷了)

push 0

lea ecx,[z] (將z對象的地址保存到ecx中)

call  point2d::point2d (0C01348h)  

mov   dword ptr [this],ecx   .將ecx(z對象的地址).保存到this指針當中

mov   eax,dword ptr [this]  .將z對象的地址賦給eax

mov ecx,dword ptr [x]; 將變量x的值取出來保存到ecx中

mov dword ptr [eax],ecx..將ecx=0賦給對象z的低4位(也就是a)

mov eax,dword ptr [this].將對象的地址賦給eax

mov ecx,dword ptr [y] 將變量y的值給ecx

mov dword ptr [eax+4],ecx 將y的值賦給高4位對象的地址(也就是b)

mov eax,dword ptr [this],將對象的地址給eax作為返回值

point3d q =z;

   
   
   
           

    
    
    
            
008538B4 lea eax,[q] ;將q的地址賦給eax
    
    
    
            
008538B7 push eax ;壓棧.作為參數
    
    
    
            
008538B8 lea ecx,[z] ;將z的地址賦給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 ;將 point2d z的地址賦給了this指針
    
    
    
            
 return{ a,b,0 };
    
    
    
            
008533A3 push 0 ;0壓棧
    
    
    
            
008533A5 mov eax,dword ptr [this] 
    
    
    
            
008533A8 mov ecx,dword ptr [eax+4] ;將z的a變量的值賦給ecx
    
    
    
            
008533AB push ecx ;ecx壓棧
    
    
    
            
008533AC mov edx,dword ptr [this] 
    
    
    
            
008533AF mov eax,dword ptr [edx] ;將a的值賦給了eax中 
    
    
    
            
008533B1 push eax ;eax壓棧
    
    
    
            
008533B2 mov ecx,dword ptr [ebp+8] ;取出q的地址
    
    
    
            
008533B5 call point3d::point3d (0851357h) ;point3d(一個q的地址.參數.3個變量參數)
    
    
    
            
008533BA mov eax,dword ptr [ebp+8] ;將q的地址取出來.作為返回值
    
    
    
            
 }
   
   
   
           

來自為知筆記(Wiz)