Function luaV_objlen

ThirdParty/lua/lua/lvm.c:404–426

** Main operation 'ra' = #rb'. */

** Main operation 'ra' = #rb'.
*/
void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) {
  const TValue *tm;
  switch (ttnov(rb)) {
    case LUA_TTABLE: {
      Table *h = hvalue(rb);
      tm = fasttm(L, h->metatable, TM_LEN);
      if (tm) break;  /* metamethod? break switch to call it */
      setivalue(ra, luaH_getn(h));  /* else primitive len */
      return;
    }
    case LUA_TSTRING: {
      setivalue(ra, tsvalue(rb)->len);
      return;
    }
    default: {  /* try metamethod */
      tm = luaT_gettmbyobj(L, rb, TM_LEN);
      if (ttisnil(tm))  /* no metamethod? */
        luaG_typeerror(L, rb, "get length of");
      break;
    }
  }
  luaT_callTM(L, tm, rb, rb, ra, 1);
}


/*