C++中函数参数如何传递给函数

C++中函数参数如何传递给函数

情况一

/* ************************************************************************
> File Name:     test.cpp
> Author:        niu0217
> Created Time:  Sun 04 Feb 2024 08:12:19 PM CST
> Description:
 ************************************************************************/

#include<iostream>
using namespace std;

int myfunc(int a, int b, int c, int d, int e, int f) {
    a = 10;
    b = 20;
    c = 30;
    d = 40;
    e = 50;
    f = 60;
    return 100;
}

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    int d = 0;
    int e = 0;
    int f = 0;
    myfunc(a, b, c, d, e, f);
    return 0;
}

调试：

In file: /home/ubuntu/Dev/My优快云/test.cpp
   24     int b = 0;
   25     int c = 0;
   26     int d = 0;
   27     int e = 0;
   28     int f = 0;
 ► 29     myfunc(a, b, c, d, e, f);
   30     return 0;
   31 }

pwndbg> disassemble
Dump of assembler code for function main():
   0x00005555555551b6 <+0>:	endbr64
   0x00005555555551ba <+4>:	push   rbp
   0x00005555555551bb <+5>:	mov    rbp,rsp
   0x00005555555551be <+8>:	sub    rsp,0x20
   0x00005555555551c2 <+12>:	mov    DWORD PTR [rbp-0x18],0x0 #a
   0x00005555555551c9 <+19>:	mov    DWORD PTR [rbp-0x14],0x0 #b
   0x00005555555551d0 <+26>:	mov    DWORD PTR [rbp-0x10],0x0 #c
   0x00005555555551d7 <+33>:	mov    DWORD PTR [rbp-0xc],0x0  #d
   0x00005555555551de <+40>:	mov    DWORD PTR [rbp-0x8],0x0  #e
   0x00005555555551e5 <+47>:	mov    DWORD PTR [rbp-0x4],0x0  #f
=> 0x00005555555551ec <+54>:	mov    r8d,DWORD PTR [rbp-0x4]
   0x00005555555551f0 <+58>:	mov    edi,DWORD PTR [rbp-0x8]
   0x00005555555551f3 <+61>:	mov    ecx,DWORD PTR [rbp-0xc]
   0x00005555555551f6 <+6