Function luaK_prefix

lib/lua/src/lcode.c:1615–1629

** Apply prefix operation 'op' to expression 'e'. */

** Apply prefix operation 'op' to expression 'e'.
*/
void luaK_prefix (FuncState *fs, UnOpr opr, expdesc *e, int line) {
  static const expdesc ef = {VKINT, {0}, NO_JUMP, NO_JUMP};
  luaK_dischargevars(fs, e);
  switch (opr) {
    case OPR_MINUS: case OPR_BNOT:  /* use 'ef' as fake 2nd operand */
      if (constfolding(fs, opr + LUA_OPUNM, e, &ef))
        break;
      /* else */ /* FALLTHROUGH */
    case OPR_LEN:
      codeunexpval(fs, unopr2op(opr), e, line);
      break;
    case OPR_NOT: codenot(fs, e); break;
    default: lua_assert(0);
  }
}


/*