gistfile1.perl

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

struct hentry {
    int foo;
    char word[1];
};

int main(void) {
    struct hentry h, *h1 = &h, *h2 = (struct hentry*)malloc(sizeof(struct hentry) - 1 + 10);
    printf("stack (0): %ld\n", __builtin_object_size(h1, 0));
    printf("stack (1): %ld\n", __builtin_object_size(h1, 1));
    printf("stack (2): %ld\n", __builtin_object_size(h1, 2));
    printf("stack (3): %ld\n", __builtin_object_size(h1, 3));

    printf("heap  (0): %ld\n", __builtin_object_size(h2, 0));
    printf("heap  (1): %ld\n", __builtin_object_size(h2, 1));
    printf("heap  (2): %ld\n", __builtin_object_size(h2, 2));
    printf("heap  (3): %ld\n", __builtin_object_size(h2, 3));
    return 0;
}


/*
[nelhage@psychotique:/tmp]$ gcc -O3 -o size size.c
[nelhage@psychotique:/tmp]$ ./size
stack (0): 8
stack (1): 8
stack (2): 8
stack (3): 8
heap  (0): 17
heap  (1): 17
heap  (2): 17
heap  (3): 17

[nelhage@psychotique:/tmp]$ g++ -O3 -o size size.c
[nelhage@psychotique:/tmp]$ ./size
stack (0): 8
stack (1): 8
stack (2): 8
stack (3): 8
heap  (0): 17
heap  (1): 17
heap  (2): 17
heap  (3): 17
*/