When a function is called, the creation and destruction of the stack frame

Creation and destruction of stack frames

Here we write a simple addition function to analyze:

#include<stdio.h>
int Add(int x,int y)
{
    int z=0;
    z=x+y;
    return z;
}
int main()
{
    int a=10;
    int b=20;
    int c=0;
    c=Add(a,b);
    printf("%d\n",c);
    system("pause");
    return 0;
}

To study the calling process of the function, we need to use the corresponding assembly code, see the figure below (Part 1)

Step 1: Create a stack frame for the main function

First, the maintenance of the stack frame requires two registers, ebp and esp. When
calling a function, ebp points to the bottom of the stack, and esp points to the top of the stack.

Step 2: Prepare the call to the Add function

Corresponding disassembly code (Part II)

Enter the Add function

Corresponding disassembly code (Part 3)