C++函数调用与寄存器使用-优快云博客

本文链接：https://blog.youkuaiyun.com/fall221/article/details/8767162

本文详细解析了一个C++示例程序，重点分析了su_1函数的实现方式及其寄存器的使用过程。通过具体的汇编代码展示了参数传递、局部变量操作及函数返回值的处理细节。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

--- d:\test\test\main.cpp ------------------------------------------------------
     1: 
     2: #include <stdio.h>
     3: 
     4: 
     5: int &su_1(int & a_, int b_)
     6: {						// 下面这一段时准备工作，忽略
00411390 55                   push        ebp  
00411391 8B EC                mov         ebp,esp  
00411393 81 EC C0 00 00 00    sub         esp,0C0h  
00411399 53                   push        ebx  
0041139A 56                   push        esi  
0041139B 57                   push        edi  
0041139C 8D BD 40 FF FF FF    lea         edi,[ebp-0C0h]  
004113A2 B9 30 00 00 00       mov         ecx,30h  
004113A7 B8 CC CC CC CC       mov         eax,0CCCCCCCCh  
004113AC F3 AB                rep stos    dword ptr es:[edi]  
     7: 	
     8: 	a_=a_+b_;
004113AE 8B 45 08             mov         eax,dword ptr [a_]  	% 变量a_的地址放入eax
004113B1 8B 08                mov         ecx,dword ptr [eax]   % 将eax地址指向的值放入ecx
004113B3 03 4D 0C             add         ecx,dword ptr [b_]  	% 将b_指向的变量值加到ecx去
004113B6 8B 55 08             mov         edx,dword ptr [a_]  	% 将遍历a_的地址放入edx
004113B9 89 0A                mov         dword ptr [edx],ecx  	% 将ecx中相加的结果存入edx地址指向的变量
     9: 	return a_;
004113BB 8B 45 08             mov         eax,dword ptr [a_]    % 函数返回：将a_地址输入到eax寄存器中
    10: }
004113BE 5F                   pop         edi  			% 函数结束后的工作
004113BF 5E                   pop         esi  
004113C0 5B                   pop         ebx  
004113C1 8B E5                mov         esp,ebp  
004113C3 5D                   pop         ebp  
004113C4 C3                   ret

main函数：

--- d:\test\test\main.cpp ------------------------------------------------------
    24: 
    25: int main()
    26: {						% 函数开始的准备工作
00411460 55                   push        ebp  
00411461 8B EC                mov         ebp,esp  
00411463 81 EC E4 00 00 00    sub         esp,0E4h  
00411469 53                   push        ebx  
0041146A 56                   push        esi  
0041146B 57                   push        edi  
0041146C 8D BD 1C FF FF FF    lea         edi,[ebp-0E4h]  
00411472 B9 39 00 00 00       mov         ecx,39h  
00411477 B8 CC CC CC CC       mov         eax,0CCCCCCCCh  
0041147C F3 AB                rep stos    dword ptr es:[edi]  
    27: 	//TYPE a={100,200};
    28: 	//TYPE b={300,400};
    29: 
    30: 	//TYPE c;
    31: 	//c=su_3(a,b);
    32: 	int a=1;
0041147E C7 45 F8 01 00 00 00 mov         dword ptr [a],1  		% 变量初始化
    33: 	int b=2;
00411485 C7 45 EC 02 00 00 00 mov         dword ptr [b],2  		% 变量初始化
    34: 	int c=su_1(a,b);
0041148C 8B 45 EC             mov         eax,dword ptr [b]  		% b的值进入eax寄存器，然后push
0041148F 50                   push        eax  
00411490 8D 4D F8             lea         ecx,[a]  			% a的地址进入ecx寄存器，然后push
00411493 51                   push        ecx  
00411494 E8 AC FC FF FF       call        su_1 (411145h)  		% 调用函数
00411499 83 C4 08             add         esp,8  			% 栈平衡
0041149C 8B 10                mov         edx,dword ptr [eax]  		% eax地址指向的内容拷贝到edx
0041149E 89 55 E0             mov         dword ptr [c],edx  		% edx的内容拷贝到变量c
    35: 	return 0;
004114A1 33 C0                xor         eax,eax  			% main函数的返回值为0
    36: }
004114A3 52                   push        edx  
004114A4 8B CD                mov         ecx,ebp  
004114A6 50                   push        eax  
004114A7 8D 15 C8 14 41 00    lea         edx,[ (4114C8h)]  
004114AD E8 CB FB FF FF       call        @ILT+120(@_RTC_CheckStackVars@8) (41107Dh)  
004114B2 58                   pop         eax  
004114B3 5A                   pop         edx  
004114B4 5F                   pop         edi  
004114B5 5E                   pop         esi  
004114B6 5B                   pop         ebx  
004114B7 81 C4 E4 00 00 00    add         esp,0E4h  
004114BD 3B EC                cmp         ebp,esp  
004114BF E8 6D FC FF FF       call        @ILT+300(__RTC_CheckEsp) (411131h)  
004114C4 8B E5                mov         esp,ebp  
004114C6 5D                   pop         ebp  
004114C7 C3                   ret  
004114C8 01                   db          01h  
004114C9 00                   db          00h  
004114CA 00                   db          00h  
004114CB 00                   db          00h  
004114CC D0                   db          d0h  
004114CD 14                   db          14h  
004114CE 41                   db          41h  
004114CF 00                   db          00h  
004114D0 F8                   db          f8h  
004114D1 ??                   db          ffh  
004114D2 ??                   db          ffh  
004114D3 FF                   db          ffh  
004114D4 04                   db          04h  
004114D5 00                   db          00h  
004114D6 00                   db          00h  
004114D7 00                   db          00h  
004114D8 DC                   db          dch  
004114D9 14                   db          14h  
004114DA 41                   db          41h  
004114DB 00                   db          00h  
004114DC 61                   db          61h  
004114DD 00                   db          00h

返回引用【3】