006 this principle pointer

 

/ * 
Directory: 
   a pointer to this principle 
* /

 

A pointer to this principle

class CTest
{
public:
    CTest(int nNum)
    {
        this->nNum = nNum;
    }
    ~CTest()
    {

    }
    void Print()
    {
        cout << nNum << endl;
    }
private:
    int nNum;
};


int main(int argc, char *argv[], char **envp)
{
    CTest c(0x11);
    c.Print();

    return 0;
}

// disassembly
 // call the function 
int main ( int argc, char * the argv [], char ** envp) 
{ 
   136 : CTest C ( 0x11 ); 
0041A8BD Push 11H   
0041A8BF LEA ECX, [C]                       @ obtaining address: ecx - address of the variable c 
0041A8C2 Call CTest :: CTest (0411983h)   
0041A8C7 DWORD PTR MOV [EBP - . 4 ], 0   
    return  0 ; 
} 


// do not transfer function 
   114 : class CTest
    115 : {
    1 16 : public :
    117 : CTest ( int nNum) 
004122F0 Push EBP   
004122F1 MOV EBP, ESP   
004122F3 Sub ESP, 0CCh   
004122F9 Push EBX   
004122FA Push ESI   
004122FB Push EDI   
004122FC Push ECX                       // push Parameters: ecx - address variable c 
004122FD lea edi , [EBP 0CCh]  
 00,412,303   mov ECX, 33h  
 00,412,308   mov eax, 0CCCCCCCCh   
0041230D REP STOS DWORD ptr es: [EDI]   
0041230F POP ECX                       // the stack parameters: ecx - address variable c    
00.41231 million   MOV DWORD PTR [ this ], ECX   // parameter assignment: ecx - Hide this pointer variable; this case the function pointer to the variable c mian address. 
   1 18 : {
    119 :          the this -> nNum = nNum;
 00,412,313   MOV EAX, DWORD PTR [ the this ]  
 00,412,316   MOV ECX, DWORD PTR [nNum]  
 00,412,319   MOV DWORD PTR [EAX], ECX  
    120 :} 
        }