main.c

#include <stdio.h>

void f1 (void) { printf("%i\n", 1); }
void f2 (void) { printf("%i\n", 2); }
void f3 (void) { printf("%i\n", 3); }
void f4 (void) { printf("%i\n", 4); }
void f5 (void) { printf("%i\n", 5); }
void f6 (void) { printf("%i\n", 6); }
void f7 (void) { printf("%i\n", 7); }
void f8 (void) { printf("%i\n", 8); }
void f9 (void) { printf("%i\n", 9); }

typedef void(*void_fp)(void);

// There is a basic check that excludes all functions that aren't used anywhere
// This ensures that check can't work in this example
const void_fp fp_all[] = {f1, f2 ,f3, f4, f5 ,f6, f7, f8, f9};

struct stable
{
  int x;
  void (*fp)(void);
};

const struct stable stable_table [3] =
{
  { 1, f2 },
  { 2, f3 },
  { 3, f4 }
};

const struct stable another_table = { 4, f5 };


void func(int i)
{
  const void_fp fp = stable_table[i].fp;

  // Illegal
  // stable_table[1] = another_table;
  fp();
}

int main()
{
  for(int i=0;i<3;i++)
  {
    func(i);
  }
  return 0;
}