Function hookf

3rd/lua-5.4.3/src/ldblib.c:323–336

** Call hook function registered at hook table for the current ** thread (if there is one) */

** thread (if there is one)
*/
static void hookf (lua_State *L, lua_Debug *ar) {
  static const char *const hooknames[] =
    {"call", "return", "line", "count", "tail call"};
  lua_getfield(L, LUA_REGISTRYINDEX, HOOKKEY);
  lua_pushthread(L);
  if (lua_rawget(L, -2) == LUA_TFUNCTION) {  /* is there a hook function? */
    lua_pushstring(L, hooknames[(int)ar->event]);  /* push event name */
    if (ar->currentline >= 0)
      lua_pushinteger(L, ar->currentline);  /* push current line */
    else lua_pushnil(L);
    lua_assert(lua_getinfo(L, "lS", ar));
    lua_call(L, 2, 0);  /* call hook function */
  }
}


/*