/* $Id$ */ /* * This file is part of OpenTTD. * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2. * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>. */ /** @file script_instance.cpp Implementation of ScriptInstance. */ #include "../stdafx.h" #include "../debug.h" #include "../saveload/saveload.h" #include "../script/squirrel_class.hpp" #include "script_fatalerror.hpp" #include "script_storage.hpp" #include "script_info.hpp" #include "script_instance.hpp" #include "api/script_controller.hpp" #include "api/script_error.hpp" #include "api/script_event.hpp" #include "api/script_log.hpp" #include "../company_base.h" #include "../company_func.h" ScriptStorage::~ScriptStorage() { /* Free our pointers */ if (event_data != NULL) ScriptEventController::FreeEventPointer(); if (log_data != NULL) ScriptLog::FreeLogPointer(); } /** * Callback called by squirrel when a script uses "print" and for error messages. * @param error_msg Is this an error message? * @param message The actual message text. */ static void PrintFunc(bool error_msg, const SQChar *message) { /* Convert to OpenTTD internal capable string */ ScriptController::Print(error_msg, SQ2OTTD(message)); } ScriptInstance::ScriptInstance(const char *APIName) : engine(NULL), controller(NULL), storage(NULL), instance(NULL), is_started(false), is_dead(false), is_save_data_on_stack(false), suspend(0), callback(NULL) { this->storage = new ScriptStorage(); this->engine = new Squirrel(APIName); this->engine->SetPrintFunction(&PrintFunc); } void ScriptInstance::Initialize(const char *main_script, const char *instance_name, CompanyID company) { ScriptObject::ActiveInstance active(this); this->controller = new ScriptController(company); /* Register the API functions and classes */ this->engine->SetGlobalPointer(this->engine); this->RegisterAPI(); try { ScriptObject::SetAllowDoCommand(false); /* Load and execute the script for this script */ if (strcmp(main_script, "%_dummy") == 0) { this->LoadDummyScript(); } else if (!this->engine->LoadScript(main_script) || this->engine->IsSuspended()) { if (this->engine->IsSuspended()) ScriptLog::Error("This script took too long to load script. AI is not started."); this->Died(); return; } /* Create the main-class */ this->instance = MallocT<SQObject>(1); if (!this->engine->CreateClassInstance(instance_name, this->controller, this->instance)) { this->Died(); return; } ScriptObject::SetAllowDoCommand(true); } catch (Script_FatalError e) { this->is_dead = true; this->engine->ThrowError(e.GetErrorMessage()); this->engine->ResumeError(); this->Died(); } } void ScriptInstance::RegisterAPI() { extern void squirrel_register_std(Squirrel *engine); squirrel_register_std(this->engine); } ScriptInstance::~ScriptInstance() { ScriptObject::ActiveInstance active(this); if (instance != NULL) this->engine->ReleaseObject(this->instance); if (engine != NULL) delete this->engine; delete this->storage; delete this->controller; free(this->instance); } void ScriptInstance::Continue() { assert(this->suspend < 0); this->suspend = -this->suspend - 1; } void ScriptInstance::Died() { DEBUG(script, 0, "The script died unexpectedly."); this->is_dead = true; if (this->instance != NULL) this->engine->ReleaseObject(this->instance); delete this->engine; this->instance = NULL; this->engine = NULL; } void ScriptInstance::GameLoop() { ScriptObject::ActiveInstance active(this); if (this->IsDead()) return; if (this->engine->HasScriptCrashed()) { /* The script crashed during saving, kill it here. */ this->Died(); return; } this->controller->ticks++; if (this->suspend < -1) this->suspend++; // Multiplayer suspend, increase up to -1. if (this->suspend < 0) return; // Multiplayer suspend, wait for Continue(). if (--this->suspend > 0) return; // Singleplayer suspend, decrease to 0. _current_company = ScriptObject::GetCompany(); /* If there is a callback to call, call that first */ if (this->callback != NULL) { if (this->is_save_data_on_stack) { sq_poptop(this->engine->GetVM()); this->is_save_data_on_stack = false; } try { this->callback(this); } catch (Script_Suspend e) { this->suspend = e.GetSuspendTime(); this->callback = e.GetSuspendCallback(); return; } } this->suspend = 0; this->callback = NULL; if (!this->is_started) { try { ScriptObject::SetAllowDoCommand(false); /* Run the constructor if it exists. Don't allow any DoCommands in it. */ if (this->engine->MethodExists(*this->instance, "constructor")) { if (!this->engine->CallMethod(*this->instance, "constructor", MAX_CONSTRUCTOR_OPS) || this->engine->IsSuspended()) { if (this->engine->IsSuspended()) ScriptLog::Error("This script took too long to initialize. Script is not started."); this->Died(); return; } } if (!this->CallLoad() || this->engine->IsSuspended()) { if (this->engine->IsSuspended()) ScriptLog::Error("This script took too long in the Load function. Script is not started."); this->Died(); return; } ScriptObject::SetAllowDoCommand(true); /* Start the script by calling Start() */ if (!this->engine->CallMethod(*this->instance, "Start", _settings_game.script.script_max_opcode_till_suspend) || !this->engine->IsSuspended()) this->Died(); } catch (Script_Suspend e) { this->suspend = e.GetSuspendTime(); this->callback = e.GetSuspendCallback(); } catch (Script_FatalError e) { this->is_dead = true; this->engine->ThrowError(e.GetErrorMessage()); this->engine->ResumeError(); this->Died(); } this->is_started = true; return; } if (this->is_save_data_on_stack) { sq_poptop(this->engine->GetVM()); this->is_save_data_on_stack = false; } /* Continue the VM */ try { if (!this->engine->Resume(_settings_game.script.script_max_opcode_till_suspend)) this->Died(); } catch (Script_Suspend e) { this->suspend = e.GetSuspendTime(); this->callback = e.GetSuspendCallback(); } catch (Script_FatalError e) { this->is_dead = true; this->engine->ThrowError(e.GetErrorMessage()); this->engine->ResumeError(); this->Died(); } } void ScriptInstance::CollectGarbage() const { if (this->is_started && !this->IsDead()) this->engine->CollectGarbage(); } /* static */ void ScriptInstance::DoCommandReturn(ScriptInstance *instance) { instance->engine->InsertResult(ScriptObject::GetLastCommandRes()); } /* static */ void ScriptInstance::DoCommandReturnVehicleID(ScriptInstance *instance) { instance->engine->InsertResult(ScriptObject::GetNewVehicleID()); } /* static */ void ScriptInstance::DoCommandReturnSignID(ScriptInstance *instance) { instance->engine->InsertResult(ScriptObject::GetNewSignID()); } /* static */ void ScriptInstance::DoCommandReturnGroupID(ScriptInstance *instance) { instance->engine->InsertResult(ScriptObject::GetNewGroupID()); } /* static */ void ScriptInstance::DoCommandReturnGoalID(ScriptInstance *instance) { instance->engine->InsertResult(ScriptObject::GetNewGoalID()); } ScriptStorage *ScriptInstance::GetStorage() { return this->storage; } void *ScriptInstance::GetLogPointer() { ScriptObject::ActiveInstance active(this); return ScriptObject::GetLogPointer(); } /* * All data is stored in the following format: * First 1 byte indicating if there is a data blob at all. * 1 byte indicating the type of data. * The data itself, this differs per type: * - integer: a binary representation of the integer (int32). * - string: First one byte with the string length, then a 0-terminated char * array. The string can't be longer than 255 bytes (including * terminating '\0'). * - array: All data-elements of the array are saved recursive in this * format, and ended with an element of the type * SQSL_ARRAY_TABLE_END. * - table: All key/value pairs are saved in this format (first key 1, then * value 1, then key 2, etc.). All keys and values can have an * arbitrary type (as long as it is supported by the save function * of course). The table is ended with an element of the type * SQSL_ARRAY_TABLE_END. * - bool: A single byte with value 1 representing true and 0 false. * - null: No data. */ /** The type of the data that follows in the savegame. */ enum SQSaveLoadType { SQSL_INT = 0x00, ///< The following data is an integer. SQSL_STRING = 0x01, ///< The following data is an string. SQSL_ARRAY = 0x02, ///< The following data is an array. SQSL_TABLE = 0x03, ///< The following data is an table. SQSL_BOOL = 0x04, ///< The following data is a boolean. SQSL_NULL = 0x05, ///< A null variable. SQSL_ARRAY_TABLE_END = 0xFF, ///< Marks the end of an array or table, no data follows. }; static byte _script_sl_byte; ///< Used as source/target by the script saveload code to store/load a single byte. /** SaveLoad array that saves/loads exactly one byte. */ static const SaveLoad _script_byte[] = { SLEG_VAR(_script_sl_byte, SLE_UINT8), SLE_END() }; /* static */ bool ScriptInstance::SaveObject(HSQUIRRELVM vm, SQInteger index, int max_depth, bool test) { if (max_depth == 0) { ScriptLog::Error("Savedata can only be nested to 25 deep. No data saved."); // SQUIRREL_MAX_DEPTH = 25 return false; } switch (sq_gettype(vm, index)) { case OT_INTEGER: { if (!test) { _script_sl_byte = SQSL_INT; SlObject(NULL, _script_byte); } SQInteger res; sq_getinteger(vm, index, &res); if (!test) { int value = (int)res; SlArray(&value, 1, SLE_INT32); } return true; } case OT_STRING: { if (!test) { _script_sl_byte = SQSL_STRING; SlObject(NULL, _script_byte); } const SQChar *res; sq_getstring(vm, index, &res); /* @bug if a string longer than 512 characters is given to SQ2OTTD, the * internal buffer overflows. */ const char *buf = SQ2OTTD(res); size_t len = strlen(buf) + 1; if (len >= 255) { ScriptLog::Error("Maximum string length is 254 chars. No data saved."); return false; } if (!test) { _script_sl_byte = (byte)len; SlObject(NULL, _script_byte); SlArray(const_cast<char *>(buf), len, SLE_CHAR); } return true; } case OT_ARRAY: { if (!test) { _script_sl_byte = SQSL_ARRAY; SlObject(NULL, _script_byte); } sq_pushnull(vm); while (SQ_SUCCEEDED(sq_next(vm, index - 1))) { /* Store the value */ bool res = SaveObject(vm, -1, max_depth - 1, test); sq_pop(vm, 2); if (!res) { sq_pop(vm, 1); return false; } } sq_pop(vm, 1); if (!test) { _script_sl_byte = SQSL_ARRAY_TABLE_END; SlObject(NULL, _script_byte); } return true; } case OT_TABLE: { if (!test) { _script_sl_byte = SQSL_TABLE; SlObject(NULL, _script_byte); } sq_pushnull(vm); while (SQ_SUCCEEDED(sq_next(vm, index - 1))) { /* Store the key + value */ bool res = SaveObject(vm, -2, max_depth - 1, test) && SaveObject(vm, -1, max_depth - 1, test); sq_pop(vm, 2); if (!res) { sq_pop(vm, 1); return false; } } sq_pop(vm, 1); if (!test) { _script_sl_byte = SQSL_ARRAY_TABLE_END; SlObject(NULL, _script_byte); } return true; } case OT_BOOL: { if (!test) { _script_sl_byte = SQSL_BOOL; SlObject(NULL, _script_byte); } SQBool res; sq_getbool(vm, index, &res); if (!test) { _script_sl_byte = res ? 1 : 0; SlObject(NULL, _script_byte); } return true; } case OT_NULL: { if (!test) { _script_sl_byte = SQSL_NULL; SlObject(NULL, _script_byte); } return true; } default: ScriptLog::Error("You tried to save an unsupported type. No data saved."); return false; } } /* static */ void ScriptInstance::SaveEmpty() { _script_sl_byte = 0; SlObject(NULL, _script_byte); } void ScriptInstance::Save() { ScriptObject::ActiveInstance active(this); /* Don't save data if the script didn't start yet or if it crashed. */ if (this->engine == NULL || this->engine->HasScriptCrashed()) { SaveEmpty(); return; } HSQUIRRELVM vm = this->engine->GetVM(); if (this->is_save_data_on_stack) { _script_sl_byte = 1; SlObject(NULL, _script_byte); /* Save the data that was just loaded. */ SaveObject(vm, -1, SQUIRREL_MAX_DEPTH, false); } else if (!this->is_started) { SaveEmpty(); return; } else if (this->engine->MethodExists(*this->instance, "Save")) { HSQOBJECT savedata; /* We don't want to be interrupted during the save function. */ bool backup_allow = ScriptObject::GetAllowDoCommand(); ScriptObject::SetAllowDoCommand(false); try { if (!this->engine->CallMethod(*this->instance, "Save", &savedata, MAX_SL_OPS)) { /* The script crashed in the Save function. We can't kill * it here, but do so in the next script tick. */ SaveEmpty(); this->engine->CrashOccurred(); return; } } catch (Script_FatalError e) { /* If we don't mark the script as dead here cleaning up the squirrel * stack could throw Script_FatalError again. */ this->is_dead = true; this->engine->ThrowError(e.GetErrorMessage()); this->engine->ResumeError(); SaveEmpty(); /* We can't kill the script here, so mark it as crashed (not dead) and * kill it in the next script tick. */ this->is_dead = false; this->engine->CrashOccurred(); return; } ScriptObject::SetAllowDoCommand(backup_allow); if (!sq_istable(savedata)) { ScriptLog::Error(this->engine->IsSuspended() ? "This script took too long to Save." : "Save function should return a table."); SaveEmpty(); this->engine->CrashOccurred(); return; } sq_pushobject(vm, savedata); if (SaveObject(vm, -1, SQUIRREL_MAX_DEPTH, true)) { _script_sl_byte = 1; SlObject(NULL, _script_byte); SaveObject(vm, -1, SQUIRREL_MAX_DEPTH, false); this->is_save_data_on_stack = true; } else { SaveEmpty(); this->engine->CrashOccurred(); } } else { ScriptLog::Warning("Save function is not implemented"); _script_sl_byte = 0; SlObject(NULL, _script_byte); } } void ScriptInstance::Suspend() { HSQUIRRELVM vm = this->engine->GetVM(); Squirrel::DecreaseOps(vm, _settings_game.script.script_max_opcode_till_suspend); } /* static */ bool ScriptInstance::LoadObjects(HSQUIRRELVM vm) { SlObject(NULL, _script_byte); switch (_script_sl_byte) { case SQSL_INT: { int value; SlArray(&value, 1, SLE_INT32); if (vm != NULL) sq_pushinteger(vm, (SQInteger)value); return true; } case SQSL_STRING: { SlObject(NULL, _script_byte); static char buf[256]; SlArray(buf, _script_sl_byte, SLE_CHAR); if (vm != NULL) sq_pushstring(vm, OTTD2SQ(buf), -1); return true; } case SQSL_ARRAY: { if (vm != NULL) sq_newarray(vm, 0); while (LoadObjects(vm)) { if (vm != NULL) sq_arrayappend(vm, -2); /* The value is popped from the stack by squirrel. */ } return true; } case SQSL_TABLE: { if (vm != NULL) sq_newtable(vm); while (LoadObjects(vm)) { LoadObjects(vm); if (vm != NULL) sq_rawset(vm, -3); /* The key (-2) and value (-1) are popped from the stack by squirrel. */ } return true; } case SQSL_BOOL: { SlObject(NULL, _script_byte); if (vm != NULL) sq_pushinteger(vm, (SQBool)(_script_sl_byte != 0)); return true; } case SQSL_NULL: { if (vm != NULL) sq_pushnull(vm); return true; } case SQSL_ARRAY_TABLE_END: { return false; } default: NOT_REACHED(); } } /* static */ void ScriptInstance::LoadEmpty() { SlObject(NULL, _script_byte); /* Check if there was anything saved at all. */ if (_script_sl_byte == 0) return; LoadObjects(NULL); } void ScriptInstance::Load(int version) { ScriptObject::ActiveInstance active(this); if (this->engine == NULL || version == -1) { LoadEmpty(); return; } HSQUIRRELVM vm = this->engine->GetVM(); SlObject(NULL, _script_byte); /* Check if there was anything saved at all. */ if (_script_sl_byte == 0) return; sq_pushinteger(vm, version); LoadObjects(vm); this->is_save_data_on_stack = true; } bool ScriptInstance::CallLoad() { HSQUIRRELVM vm = this->engine->GetVM(); /* Is there save data that we should load? */ if (!this->is_save_data_on_stack) return true; /* Whatever happens, after CallLoad the savegame data is removed from the stack. */ this->is_save_data_on_stack = false; if (!this->engine->MethodExists(*this->instance, "Load")) { ScriptLog::Warning("Loading failed: there was data for the script to load, but the script does not have a Load() function."); /* Pop the savegame data and version. */ sq_pop(vm, 2); return true; } /* Go to the instance-root */ sq_pushobject(vm, *this->instance); /* Find the function-name inside the script */ sq_pushstring(vm, OTTD2SQ("Load"), -1); /* Change the "Load" string in a function pointer */ sq_get(vm, -2); /* Push the main instance as "this" object */ sq_pushobject(vm, *this->instance); /* Push the version data and savegame data as arguments */ sq_push(vm, -5); sq_push(vm, -5); /* Call the script load function. sq_call removes the arguments (but not the * function pointer) from the stack. */ if (SQ_FAILED(sq_call(vm, 3, SQFalse, SQFalse, MAX_SL_OPS))) return false; /* Pop 1) The version, 2) the savegame data, 3) the object instance, 4) the function pointer. */ sq_pop(vm, 4); return true; } SQInteger ScriptInstance::GetOpsTillSuspend() { return this->engine->GetOpsTillSuspend(); } void ScriptInstance::DoCommandCallback(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2) { ScriptObject::ActiveInstance active(this); ScriptObject::SetLastCommandRes(result.Succeeded()); if (result.Failed()) { ScriptObject::SetLastError(ScriptError::StringToError(result.GetErrorMessage())); } else { ScriptObject::IncreaseDoCommandCosts(result.GetCost()); ScriptObject::SetLastCost(result.GetCost()); } } void ScriptInstance::InsertEvent(class ScriptEvent *event) { ScriptObject::ActiveInstance active(this); ScriptEventController::InsertEvent(event); }