一文详解C#中方法重载的底层玩法

#include <stdio.h>

int say() {
	return 1;
}
int say(int i) {
	return i;
}

int main()
{
	say(10);
	return 0;
}

#include <stdio.h>

int say(int i) {
	return i;
}

int main()
{
	say(10);
	return 0;
}

--------------- say(10) -----------

00C41771  push        0Ah  
00C41773  call        _say (0C412ADh)  

--------------- 符号表 -----------

00C412AD  jmp         say (0C417B0h)  

--------------- say body -----------

00C417B0  push        ebp  
00C417B1  mov         ebp,esp  
00C417B3  sub         esp,0C0h  
00C417B9  push        ebx  
00C417BA  push        esi  
00C417BB  push        edi  
00C417BC  mov         edi,ebp  
00C417BE  xor         ecx,ecx  
00C417C0  mov         eax,0CCCCCCCCh  
00C417C5  rep stos    dWord ptr es:[edi]  
00C417C7  mov         ecx,offset _2440747F_ConsoleApplication6@c (0C4C008h)  
...

using namespace std;

class Person
{
public:
	void sayhello(int i) {
		cout << i << endl;
	}
	void sayhello(const char* c) {
		cout << c << endl;
	}
};

int main(int arGC)
{
	Person person;

	person.sayhello(10);
	person.sayhello("hello world");
}

----------     person.sayhello(10);  ----------------

003B2E5F  push        0Ah  
003B2E61  lea         ecx,[person]  
003B2E64  call        Person::sayhello (03B13A2h) 

------------  person.sayhello("hello world"); ----------------

003B2E69  push        offset string "hello world" (03B9C2Ch)  
003B2E6E  lea         ecx,[person]  
003B2E71  call        Person::sayhello (03B1302h) 

    internal class Program
    {
        static void Main(string[] args)
        {
			//故意做一次重复
            Say(10);
            Say("hello world");

            Say(10);
            Say("hello world");
            Console.ReadLine();
        }

        static void Say(int i)
        {
            Console.WriteLine(i);
        }

        static void Say(string s)
        {
            Console.WriteLine(s);
        }
    }

 -----------	Say(10);	-----------

00007FFB82134DFC  mov         ecx,0Ah  
00007FFB82134E01  call        Method stub for: ConsoleApp1.Program.Say(Int32) (07FFB81F6F118h)  
00007FFB82134E06  nop  

-----------	Say("hello world");		-----------

00007FFB82134E07  mov         rcx,qword ptr [1A8C65E8h]  
00007FFB82134E0F  call        Method stub for: ConsoleApp1.Program.Say(System.String) (07FFB81F6F120h)  
00007FFB82134E14  nop  

-----------	Say(10);	-----------
00007FFB82134E01  call        Method stub for: ConsoleApp1.Program.Say(Int32) (07FFB81F6F118h)  

-----------	符号表	-----------
00007FFB81F6F118  jmp         ConsoleApp1.Program.Say(Int32) (07FFB82134F10h)  

-----------	Say body -----------

00007FFB82134F10  push        rbp  
00007FFB82134F11  push        rdi  
00007FFB82134F12  push        rsi  
00007FFB82134F13  sub         rsp,20h  
00007FFB82134F17  mov         rbp,rsp  
00007FFB82134F1A  mov         dword ptr [rbp+40h],ecx  
00007FFB82134F1D  cmp         dword ptr [7FFB82036B80h],0  
00007FFB82134F24  je          ConsoleApp1.Program.Say(Int32)+01Bh (07FFB82134F2Bh)  
00007FFB82134F26  call        00007FFBE1C2CC40