sort_datum
const struct sort_datum *d1 = (const struct sort_datum *)left;
const struct sort_datum *d2 = (const struct sort_datum *)right;
static struct sort_datum *sort_btf_c(const struct btf *btf)
struct sort_datum *datums;
datums = malloc(sizeof(struct sort_datum) * n);
struct sort_datum *d = datums + i;
qsort(datums, n, sizeof(struct sort_datum), btf_type_compare);
struct sort_datum *datums = NULL;