Function isKstr

lib/lua/src/lcode.c:1221–1224

** Check whether expression 'e' is a short literal string */

** Check whether expression 'e' is a short literal string
*/
static int isKstr (FuncState *fs, expdesc *e) {
  return (e->k == VK && !hasjumps(e) && e->u.info <= MAXARG_B &&
          ttisshrstring(&fs->f->k[e->u.info]));
}

/*
** Check whether expression 'e' is a literal integer.