Get argument using function frame

gistfile1.cpp

#include <iostream>
#include <cstdio>

using namespace std;

int testCall(int a, int b) {
	void* p = __builtin_frame_address(0);
	printf("Function pointer frame : %p\n", p);
	printf("Param a pointer = %p\n", &a);
	printf("Param b pointer = %p\n", &b);
	int* i = (int*)p;
	i--;
	printf("a = %d, at address : %p\n", *i, i);
	i--;
	printf("b = %d, at address : %p\n", *i, i);

	return 0;
}

int main(int argc, char *argv[]) {
	testCall(20, 30);
}