mirror of https://github.com/OpenTTD/OpenTTD.git
Codechange: Template the command callback function type to allow unpacked arguments.
This commit is contained in:
parent
13528bfcd0
commit
d85348b1d1
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@ -78,6 +78,20 @@ private:
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static int _counter;
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};
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#if defined(__GNUC__) && !defined(__clang__)
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/*
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* We cast specialized function pointers to a generic one, but don't use the
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* converted value to call the function, which is safe, except that GCC
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* helpfully thinks it is not.
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*
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* "Any pointer to function can be converted to a pointer to a different function type.
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* Calling the function through a pointer to a different function type is undefined,
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* but converting such pointer back to pointer to the original function type yields
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* the pointer to the original function." */
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wcast-function-type"
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# define SILENCE_GCC_FUNCTION_POINTER_CAST
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#endif
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template<Commands TCmd, typename T, bool THasTile> struct CommandHelper;
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@ -148,18 +162,19 @@ public:
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* @param err_message Message prefix to show on error
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* @param args Parameters for the command
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*/
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static inline bool Post(StringID err_message, Targs... args) { return Post(err_message, nullptr, std::forward<Targs>(args)...); }
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static inline bool Post(StringID err_message, Targs... args) { return Post<CommandCallback>(err_message, nullptr, std::forward<Targs>(args)...); }
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/**
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* Shortcut for the long Post when not using an error message.
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* @param callback A callback function to call after the command is finished
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* @param args Parameters for the command
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*/
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static inline bool Post(CommandCallback *callback, Targs... args) { return Post((StringID)0, callback, std::forward<Targs>(args)...); }
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template <typename Tcallback>
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static inline bool Post(Tcallback *callback, Targs... args) { return Post((StringID)0, callback, std::forward<Targs>(args)...); }
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/**
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* Shortcut for the long Post when not using a callback or an error message.
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* @param args Parameters for the command
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*/
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static inline bool Post(Targs... args) { return Post((StringID)0, nullptr, std::forward<Targs>(args)...); }
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static inline bool Post(Targs... args) { return Post<CommandCallback>((StringID)0, nullptr, std::forward<Targs>(args)...); }
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/**
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* Top-level network safe command execution for the current company.
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@ -171,7 +186,8 @@ public:
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* @param args Parameters for the command
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* @return \c true if the command succeeded, else \c false.
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*/
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static bool Post(StringID err_message, CommandCallback *callback, Targs... args)
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template <typename Tcallback>
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static bool Post(StringID err_message, Tcallback *callback, Targs... args)
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{
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return InternalPost(err_message, callback, true, false, std::forward_as_tuple(args...));
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}
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@ -185,7 +201,8 @@ public:
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* @param args Parameters for the command
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* @return \c true if the command succeeded, else \c false.
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*/
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static bool PostFromNet(StringID err_message, CommandCallback *callback, bool my_cmd, TileIndex location, std::tuple<Targs...> args)
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template <typename Tcallback>
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static bool PostFromNet(StringID err_message, Tcallback *callback, bool my_cmd, TileIndex location, std::tuple<Targs...> args)
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{
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return InternalPost(err_message, callback, my_cmd, true, location, std::move(args));
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}
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@ -194,11 +211,10 @@ public:
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* Prepare a command to be send over the network
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* @param cmd The command to execute (a CMD_* value)
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* @param err_message Message prefix to show on error
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* @param callback A callback function to call after the command is finished
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* @param company The company that wants to send the command
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* @param args Parameters for the command
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*/
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static void SendNet(StringID err_message, CommandCallback *callback, CompanyID company, Targs... args)
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static void SendNet(StringID err_message, CompanyID company, Targs... args)
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{
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auto args_tuple = std::forward_as_tuple(args...);
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@ -207,7 +223,7 @@ public:
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tile = std::get<0>(args_tuple);
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}
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::NetworkSendCommand(Tcmd, err_message, callback, _current_company, tile, EndianBufferWriter<CommandDataBuffer>::FromValue(args_tuple));
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::NetworkSendCommand(Tcmd, err_message, nullptr, _current_company, tile, EndianBufferWriter<CommandDataBuffer>::FromValue(args_tuple));
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}
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/**
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@ -220,9 +236,10 @@ public:
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* @param args Parameters for the command
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* @return the command cost of this function.
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*/
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static CommandCost Unsafe(StringID err_message, CommandCallback *callback, bool my_cmd, bool estimate_only, TileIndex location, std::tuple<Targs...> args)
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template <typename Tcallback>
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static CommandCost Unsafe(StringID err_message, Tcallback *callback, bool my_cmd, bool estimate_only, TileIndex location, std::tuple<Targs...> args)
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{
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return Execute(err_message, callback, my_cmd, estimate_only, false, location, std::move(args));
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return Execute(err_message, reinterpret_cast<CommandCallback *>(callback), my_cmd, estimate_only, false, location, std::move(args));
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}
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protected:
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@ -242,7 +259,8 @@ protected:
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((SetClientIdHelper(std::get<Tindices>(values))), ...);
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}
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static bool InternalPost(StringID err_message, CommandCallback *callback, bool my_cmd, bool network_command, std::tuple<Targs...> args)
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template <typename Tcallback>
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static bool InternalPost(StringID err_message, Tcallback *callback, bool my_cmd, bool network_command, std::tuple<Targs...> args)
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{
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/* Where to show the message? */
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TileIndex tile{};
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@ -253,7 +271,8 @@ protected:
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return InternalPost(err_message, callback, my_cmd, network_command, tile, std::move(args));
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}
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static bool InternalPost(StringID err_message, CommandCallback *callback, bool my_cmd, bool network_command, TileIndex tile, std::tuple<Targs...> args)
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template <typename Tcallback>
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static bool InternalPost(StringID err_message, Tcallback *callback, bool my_cmd, bool network_command, TileIndex tile, std::tuple<Targs...> args)
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{
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auto [err, estimate_only, only_sending] = InternalPostBefore(Tcmd, GetCommandFlags<Tcmd>(), tile, err_message, network_command);
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if (err) return false;
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@ -261,7 +280,7 @@ protected:
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/* Only set client IDs when the command does not come from the network. */
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if (!network_command && GetCommandFlags<Tcmd>() & CMD_CLIENT_ID) SetClientIds(args, std::index_sequence_for<Targs...>{});
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CommandCost res = Execute(err_message, callback, my_cmd, estimate_only, network_command, tile, args);
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CommandCost res = Execute(err_message, reinterpret_cast<CommandCallback *>(callback), my_cmd, estimate_only, network_command, tile, args);
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InternalPostResult(res, tile, estimate_only, only_sending, err_message, my_cmd);
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if (!estimate_only && !only_sending && callback != nullptr) {
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@ -360,20 +379,21 @@ struct CommandHelper<Tcmd, CommandCost(*)(DoCommandFlag, Targs...), false> : Com
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* @param location Tile location for user feedback.
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* @param args Parameters for the command
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*/
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static inline bool Post(StringID err_message, TileIndex location, Targs... args) { return Post(err_message, nullptr, location, std::forward<Targs>(args)...); }
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static inline bool Post(StringID err_message, TileIndex location, Targs... args) { return Post<CommandCallback>(err_message, nullptr, location, std::forward<Targs>(args)...); }
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/**
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* Shortcut for Post when not using a callback.
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* @param callback A callback function to call after the command is finished
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* @param location Tile location for user feedback.
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* @param args Parameters for the command
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*/
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static inline bool Post(CommandCallback *callback, TileIndex location, Targs... args) { return Post((StringID)0, callback, location, std::forward<Targs>(args)...); }
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template <typename Tcallback>
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static inline bool Post(Tcallback *callback, TileIndex location, Targs... args) { return Post((StringID)0, callback, location, std::forward<Targs>(args)...); }
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/**
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* Shortcut for Post when not using a callback or an error message.
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* @param location Tile location for user feedback.
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* @param args Parameters for the command*
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*/
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static inline bool Post(TileIndex location, Targs... args) { return Post((StringID)0, nullptr, location, std::forward<Targs>(args)...); }
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static inline bool Post(TileIndex location, Targs... args) { return Post<CommandCallback>((StringID)0, nullptr, location, std::forward<Targs>(args)...); }
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/**
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* Post variant that takes a TileIndex (for error window location and text effects) for
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@ -384,12 +404,16 @@ struct CommandHelper<Tcmd, CommandCost(*)(DoCommandFlag, Targs...), false> : Com
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* @param args Parameters for the command
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* @return \c true if the command succeeded, else \c false.
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*/
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static inline bool Post(StringID err_message, CommandCallback *callback, TileIndex location, Targs... args)
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template <typename Tcallback>
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static inline bool Post(StringID err_message, Tcallback *callback, TileIndex location, Targs... args)
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{
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return CommandHelper<Tcmd, CommandCost(*)(DoCommandFlag, Targs...), true>::InternalPost(err_message, callback, true, false, location, std::forward_as_tuple(args...));
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}
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};
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#ifdef SILENCE_GCC_FUNCTION_POINTER_CAST
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# pragma GCC diagnostic pop
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#endif
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template <Commands Tcmd>
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using Command = CommandHelper<Tcmd, typename CommandTraits<Tcmd>::ProcType, std::is_same_v<TileIndex, std::tuple_element_t<0, typename CommandTraits<Tcmd>::Args>>>;
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@ -840,7 +840,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet
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* the server will give us a client-id and let us in */
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_network_join_status = NETWORK_JOIN_STATUS_REGISTERING;
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ShowJoinStatusWindow();
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Command<CMD_COMPANY_CTRL>::SendNet(STR_NULL, nullptr, _local_company, CCA_NEW, INVALID_COMPANY, CRR_NONE, INVALID_CLIENT_ID);
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Command<CMD_COMPANY_CTRL>::SendNet(STR_NULL, _local_company, CCA_NEW, INVALID_COMPANY, CRR_NONE, INVALID_CLIENT_ID);
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}
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} else {
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/* take control over an existing company */
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@ -53,55 +53,95 @@
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#include "../safeguards.h"
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/** Table with all the callbacks we'll use for conversion*/
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static CommandCallback * const _callback_table[] = {
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/* 0x00 */ nullptr,
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/* 0x01 */ CcBuildPrimaryVehicle,
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/* 0x02 */ CcBuildAirport,
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/* 0x03 */ CcBuildBridge,
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/* 0x04 */ CcPlaySound_CONSTRUCTION_WATER,
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/* 0x05 */ CcBuildDocks,
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/* 0x06 */ CcFoundTown,
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/* 0x07 */ CcBuildRoadTunnel,
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/* 0x08 */ CcBuildRailTunnel,
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/* 0x09 */ CcBuildWagon,
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/* 0x0A */ CcRoadDepot,
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/* 0x0B */ CcRailDepot,
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/* 0x0C */ CcPlaceSign,
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/* 0x0D */ CcPlaySound_EXPLOSION,
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/* 0x0E */ CcPlaySound_CONSTRUCTION_OTHER,
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/* 0x0F */ CcPlaySound_CONSTRUCTION_RAIL,
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/* 0x10 */ CcStation,
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/* 0x11 */ CcTerraform,
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/* 0x12 */ CcAI,
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/* 0x13 */ CcCloneVehicle,
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/* 0x14 */ nullptr,
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/* 0x15 */ CcCreateGroup,
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/* 0x16 */ CcFoundRandomTown,
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/* 0x17 */ CcRoadStop,
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/* 0x18 */ CcBuildIndustry,
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/* 0x19 */ CcStartStopVehicle,
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/* 0x1A */ CcGame,
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/* 0x1B */ CcAddVehicleNewGroup,
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};
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/** Typed list of all possible callbacks. */
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static constexpr auto _callback_tuple = std::make_tuple(
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(CommandCallback *)nullptr, // Make sure this is actually a pointer-to-function.
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&CcBuildPrimaryVehicle,
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&CcBuildAirport,
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&CcBuildBridge,
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&CcPlaySound_CONSTRUCTION_WATER,
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&CcBuildDocks,
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&CcFoundTown,
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&CcBuildRoadTunnel,
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&CcBuildRailTunnel,
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&CcBuildWagon,
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&CcRoadDepot,
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&CcRailDepot,
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&CcPlaceSign,
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&CcPlaySound_EXPLOSION,
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&CcPlaySound_CONSTRUCTION_OTHER,
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&CcPlaySound_CONSTRUCTION_RAIL,
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&CcStation,
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&CcTerraform,
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&CcAI,
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&CcCloneVehicle,
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&CcCreateGroup,
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&CcFoundRandomTown,
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&CcRoadStop,
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&CcBuildIndustry,
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&CcStartStopVehicle,
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&CcGame,
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&CcAddVehicleNewGroup
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);
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#ifdef SILENCE_GCC_FUNCTION_POINTER_CAST
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/*
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* We cast specialized function pointers to a generic one, but don't use the
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* converted value to call the function, which is safe, except that GCC
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* helpfully thinks it is not.
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*
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* "Any pointer to function can be converted to a pointer to a different function type.
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* Calling the function through a pointer to a different function type is undefined,
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* but converting such pointer back to pointer to the original function type yields
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* the pointer to the original function." */
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wcast-function-type"
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#endif
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/* Helpers to generate the callback table from the callback list. */
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inline constexpr size_t _callback_tuple_size = std::tuple_size_v<decltype(_callback_tuple)>;
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template <size_t... i>
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inline auto MakeCallbackTable(std::index_sequence<i...>) noexcept
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{
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return std::array<CommandCallback *, sizeof...(i)>{{ reinterpret_cast<CommandCallback *>(reinterpret_cast<void(*)()>(std::get<i>(_callback_tuple)))... }}; // MingW64 fails linking when casting a pointer to its own type. To work around, cast it to some other type first.
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}
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/** Type-erased table of callbacks. */
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static auto _callback_table = MakeCallbackTable(std::make_index_sequence<_callback_tuple_size>{});
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/* Helpers to generate the command dispatch table from the command traits. */
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template <Commands Tcmd> static CommandDataBuffer SanitizeCmdStrings(const CommandDataBuffer &data);
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template <Commands Tcmd> static void UnpackNetworkCommand(const CommandPacket *cp);
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template <Commands Tcmd, size_t cb> static void UnpackNetworkCommand(const CommandPacket *cp);
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template <Commands Tcmd> static void NetworkReplaceCommandClientId(CommandPacket &cp, ClientID client_id);
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using UnpackNetworkCommandProc = void (*)(const CommandPacket *);
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using UnpackDispatchT = std::array<UnpackNetworkCommandProc, _callback_tuple_size>;
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struct CommandDispatch {
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CommandDataBuffer(*Sanitize)(const CommandDataBuffer &);
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void (*ReplaceClientId)(CommandPacket &, ClientID);
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void (*Unpack)(const CommandPacket *);
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UnpackDispatchT Unpack;
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};
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template<typename T, T... i>
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inline constexpr auto MakeDispatchTable(std::integer_sequence<T, i...>) noexcept
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template <Commands Tcmd, size_t... i>
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constexpr UnpackDispatchT MakeUnpackNetworkCommand(std::index_sequence<i...>) noexcept
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{
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return std::array<CommandDispatch, sizeof...(i)>{{ { &SanitizeCmdStrings<static_cast<Commands>(i)>, &NetworkReplaceCommandClientId<static_cast<Commands>(i)>, &UnpackNetworkCommand<static_cast<Commands>(i)> }... }};
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return UnpackDispatchT{{ {&UnpackNetworkCommand<Tcmd, i>}... }};
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}
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static constexpr auto _cmd_dispatch = MakeDispatchTable(std::make_integer_sequence<std::underlying_type_t<Commands>, CMD_END>{});
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template <typename T, T... i, size_t... j>
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inline constexpr auto MakeDispatchTable(std::integer_sequence<T, i...>, std::index_sequence<j...>) noexcept
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{
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return std::array<CommandDispatch, sizeof...(i)>{{ { &SanitizeCmdStrings<static_cast<Commands>(i)>, &NetworkReplaceCommandClientId<static_cast<Commands>(i)>, MakeUnpackNetworkCommand<static_cast<Commands>(i)>(std::make_index_sequence<_callback_tuple_size>{}) }... }};
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}
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/** Command dispatch table. */
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static constexpr auto _cmd_dispatch = MakeDispatchTable(std::make_integer_sequence<std::underlying_type_t<Commands>, CMD_END>{}, std::make_index_sequence<_callback_tuple_size>{});
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#ifdef SILENCE_GCC_FUNCTION_POINTER_CAST
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# pragma GCC diagnostic pop
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#endif
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/**
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@ -179,6 +219,20 @@ static CommandQueue _local_wait_queue;
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static CommandQueue _local_execution_queue;
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/**
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* Find the callback index of a callback pointer.
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* @param callback Address of callback to search for.
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* @return Callback index or std::numeric_limits<size_t>::max() if the function wasn't found in the callback list.
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*/
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static size_t FindCallbackIndex(CommandCallback *callback)
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{
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if (auto it = std::find(std::cbegin(_callback_table), std::cend(_callback_table), callback); it != std::cend(_callback_table)) {
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return static_cast<size_t>(std::distance(std::cbegin(_callback_table), it));
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}
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return std::numeric_limits<size_t>::max();
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}
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/**
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* Prepare a DoCommand to be send over the network
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* @param cmd The command to execute (a CMD_* value)
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@ -259,7 +313,9 @@ void NetworkExecuteLocalCommandQueue()
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/* We can execute this command */
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_current_company = cp->company;
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_cmd_dispatch[cp->cmd].Unpack(cp);
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size_t cb_index = FindCallbackIndex(cp->callback);
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assert(cb_index < _callback_tuple_size);
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_cmd_dispatch[cp->cmd].Unpack[cb_index](cp);
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queue.Pop();
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delete cp;
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@ -354,7 +410,7 @@ const char *NetworkGameSocketHandler::ReceiveCommand(Packet *p, CommandPacket *c
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cp->data = _cmd_dispatch[cp->cmd].Sanitize(p->Recv_buffer());
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byte callback = p->Recv_uint8();
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if (callback >= lengthof(_callback_table)) return "invalid callback";
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if (callback >= _callback_table.size()) return "invalid callback";
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cp->callback = _callback_table[callback];
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return nullptr;
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@ -373,16 +429,12 @@ void NetworkGameSocketHandler::SendCommand(Packet *p, const CommandPacket *cp)
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p->Send_uint32(cp->tile);
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p->Send_buffer(cp->data);
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byte callback = 0;
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while (callback < lengthof(_callback_table) && _callback_table[callback] != cp->callback) {
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callback++;
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}
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if (callback == lengthof(_callback_table)) {
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size_t callback = FindCallbackIndex(cp->callback);
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if (callback > UINT8_MAX) {
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Debug(net, 0, "Unknown callback for command; no callback sent (command: {})", cp->cmd);
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callback = 0; // _callback_table[0] == nullptr
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}
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p->Send_uint8 (callback);
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p->Send_uint8 ((uint8)callback);
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}
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/** Helper to process a single ClientID argument. */
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@ -455,9 +507,15 @@ CommandDataBuffer SanitizeCmdStrings(const CommandDataBuffer &data)
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return EndianBufferWriter<CommandDataBuffer>::FromValue(args);
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}
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template <Commands Tcmd>
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void UnpackNetworkCommand(const CommandPacket *cp)
|
||||
/**
|
||||
* Unpack a generic command packet into its actual typed components.
|
||||
* @tparam Tcmd Command type to be unpacked.
|
||||
* @tparam Tcb Index into the callback list.
|
||||
* @param cp Command packet to unpack.
|
||||
*/
|
||||
template <Commands Tcmd, size_t Tcb>
|
||||
void UnpackNetworkCommand(const CommandPacket* cp)
|
||||
{
|
||||
auto args = EndianBufferReader::ToValue<typename CommandTraits<Tcmd>::Args>(cp->data);
|
||||
Command<Tcmd>::PostFromNet(cp->err_msg, cp->callback, cp->my_cmd, cp->tile, args);
|
||||
Command<Tcmd>::PostFromNet(cp->err_msg, std::get<Tcb>(_callback_tuple), cp->my_cmd, cp->tile, args);
|
||||
}
|
||||
|
|
|
@ -1538,7 +1538,7 @@ private:
|
|||
if (_network_server) {
|
||||
Command<CMD_COMPANY_CTRL>::Post(CCA_NEW, INVALID_COMPANY, CRR_NONE, _network_own_client_id);
|
||||
} else {
|
||||
Command<CMD_COMPANY_CTRL>::SendNet(STR_NULL, nullptr, _local_company, CCA_NEW, INVALID_COMPANY, CRR_NONE, INVALID_CLIENT_ID);
|
||||
Command<CMD_COMPANY_CTRL>::SendNet(STR_NULL, _local_company, CCA_NEW, INVALID_COMPANY, CRR_NONE, INVALID_CLIENT_ID);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
@ -2081,7 +2081,7 @@ void NetworkServerNewCompany(const Company *c, NetworkClientInfo *ci)
|
|||
/* ci is nullptr when replaying, or for AIs. In neither case there is a client. */
|
||||
ci->client_playas = c->index;
|
||||
NetworkUpdateClientInfo(ci->client_id);
|
||||
Command<CMD_RENAME_PRESIDENT>::SendNet(STR_NULL, nullptr, c->index, ci->client_name);
|
||||
Command<CMD_RENAME_PRESIDENT>::SendNet(STR_NULL, c->index, ci->client_name);
|
||||
}
|
||||
|
||||
/* Announce new company on network. */
|
||||
|
|
|
@ -198,7 +198,7 @@ CommandCost CmdClearOrderBackup(DoCommandFlag flags, TileIndex tile, ClientID us
|
|||
/* We need to circumvent the "prevention" from this command being executed
|
||||
* while the game is paused, so use the internal method. Nor do we want
|
||||
* this command to get its cost estimated when shift is pressed. */
|
||||
Command<CMD_CLEAR_ORDER_BACKUP>::Unsafe(STR_NULL, nullptr, true, false, ob->tile, CommandTraits<CMD_CLEAR_ORDER_BACKUP>::Args{ ob->tile, static_cast<ClientID>(user) });
|
||||
Command<CMD_CLEAR_ORDER_BACKUP>::Unsafe<CommandCallback>(STR_NULL, nullptr, true, false, ob->tile, CommandTraits<CMD_CLEAR_ORDER_BACKUP>::Args{ ob->tile, static_cast<ClientID>(user) });
|
||||
} else {
|
||||
/* The command came from the game logic, i.e. the clearing of a tile.
|
||||
* In that case we have no need to actually sync this, just do it. */
|
||||
|
|
|
@ -1600,7 +1600,7 @@ void SyncCompanySettings()
|
|||
const SettingDesc *sd = GetSettingDesc(desc);
|
||||
uint32 old_value = (uint32)sd->AsIntSetting()->Read(new_object);
|
||||
uint32 new_value = (uint32)sd->AsIntSetting()->Read(old_object);
|
||||
if (old_value != new_value) Command<CMD_CHANGE_COMPANY_SETTING>::SendNet(STR_NULL, nullptr, _local_company, sd->GetName(), new_value);
|
||||
if (old_value != new_value) Command<CMD_CHANGE_COMPANY_SETTING>::SendNet(STR_NULL, _local_company, sd->GetName(), new_value);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue