THMAP_GETPTR
thmap->root = THMAP_GETPTR(thmap, root);
thmap->root = THMAP_GETPTR(thmap, root_off);
#define THMAP_NODE(th, p) THMAP_GETPTR(th, THMAP_ALIGN(p))
thmap_gc_t *const gc = THMAP_GETPTR(thmap, gcaddr);
char *const ptr = THMAP_GETPTR(thmap, addr);
const void *key = THMAP_GETPTR(thmap, leaf->key);
const void *leafkey = THMAP_GETPTR(thmap, leaf->key);
node = THMAP_GETPTR(thmap, p);
leaf = THMAP_GETPTR(thmap, leaf_off);
memcpy(THMAP_GETPTR(thmap, key_off), key, len);
char *const ptr = THMAP_GETPTR(thmap, addr);