How to get the length of a function in bytes?

Question

I want to know the length of C function (written by me) at runtime. Any method to get it? It seems sizeof doesn\'t work here.

Answer 1

You can find the length of your C function by subtracting the addresses of functions. Let me provide you an example

int function1()
    {
    } 

int function2()
{
    int a,b;    //just defining some variable for increasing the memory size
    printf("This function would take more memory than earlier function i.e function01 ");
}

int main()
{
    printf("Printing the address of function01 %p\n",function01);
    printf("Printing the address of function02 %p\n",function02);
    printf("Printing the address of main %p\n",main);
    return 0;
}

Hope you would get your answer after compiling it. After compiling you will able to see the difference in size of function01 and function2.

Note : Normally there is 16bytes diff between one function and other.