#include <stdlib.h>
#include <stdio.h>

#define autofree  __attribute((cleanup(__autofree)))

static void __autofree (void *p) {
  void **_p = (void**)p;
  printf("free -> %p\n", *_p);
  free(*_p);
}

static void *myalloc (size_t sz) {
  void *ptr;
  if ((ptr = malloc(sz)) == NULL) {
    fprintf(stderr, "malloc failed.\n");
    exit(1);
  }
  printf("malloc -> %p\n", ptr);
  return ptr;
}

int main (int argc, char *argv[]) {
  autofree char *x = myalloc(32);
  {
    autofree int *y = myalloc(64);
    printf("y = %p\n", y);
  }
  printf("x = %p\n", x);
  return 0;
}