struct寻址&for反汇编

//for 反汇编
#include<stdio.h>
 
int main()
{
    int i=;
    int s=;
    for(i=;i<;i++)
    {
        s=s+;
    }
    s=;
    for(i=;i>=;i--)
    {
        s=s+;
    }
 
    return ;
 
}

//for 反汇编
#include<stdio.h>
 
int main()
{
000000013F1231E0  push        rdi
000000013F1231E2  sub         rsp,10h
000000013F1231E6  mov         rdi,rsp
000000013F1231E9  mov         ecx,
000000013F1231EE  mov         eax,0CCCCCCCCh
000000013F1231F3  rep stos    dword ptr [rdi]
    int i=;
000000013F1231F5  mov         dword ptr [rsp],
    int s=;
000000013F1231FC  mov         dword ptr [s],
    for(i=;i<20;i++)
000000013F123204  mov         dword ptr [rsp],0Ah
000000013F12320B  jmp         main+35h (013F123215h)
000000013F12320D  mov         eax,dword ptr [rsp]
000000013F123210  inc         eax
000000013F123212  mov         dword ptr [rsp],eax
000000013F123215  cmp         dword ptr [rsp],14h
                  ; i>=20 则跳出循环
000000013F123219  jge         main+47h (013F123227h)
    {
        s=s+;
000000013F12321B  mov         eax,dword ptr [s]
000000013F12321F  inc         eax
000000013F123221  mov         dword ptr [s],eax
    }
000000013F123225  jmp         main+2Dh (013F12320Dh)
    s=;
000000013F123227  mov         dword ptr [s],
    for(i=;i>=1;i--)
000000013F12322F  mov         dword ptr [rsp],0Ah
    for(i=;i>=1;i--)
000000013F123236  jmp         main+60h (013F123240h)
000000013F123238  mov         eax,dword ptr [rsp]
000000013F12323B  dec         eax
000000013F12323D  mov         dword ptr [rsp],eax
000000013F123240  cmp         dword ptr [rsp],
                  ;小于则跳出循环
000000013F123244  jl          main+72h (013F123252h)
    {
        s=s+;
000000013F123246  mov         eax,dword ptr [s]
000000013F12324A  inc         eax
000000013F12324C  mov         dword ptr [s],eax
    }
000000013F123250  jmp         main+58h (013F123238h)  
 
    return ;
000000013F123252  xor         eax,eax  
 
}
000000013F123254  add         rsp,10h
000000013F123258  pop         rdi
000000013F123259  ret  

图片来自：《天书夜读 从汇编语言到windows内核编程》 作者：谭文 邵坚磊

如果是release版，for被优化，模仿do-while语句，把跳转判断以及限制变量的改变放在结尾处。

struct寻址：

在c反汇编中，结构与枚举、联合没有差别。