mirror of
https://github.com/OpenMW/openmw.git
synced 2025-11-04 15:26:57 +00:00
469 lines
18 KiB
C++
469 lines
18 KiB
C++
#include "luastate.hpp"
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#ifndef NO_LUAJIT
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#include <luajit.h>
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#endif // NO_LUAJIT
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#include <filesystem>
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#include <fstream>
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#include <components/debug/debuglog.hpp>
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#include <components/files/conversion.hpp>
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#include <components/vfs/manager.hpp>
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#include "scriptscontainer.hpp"
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#include "utf8.hpp"
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namespace LuaUtil
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{
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static std::string packageNameToVfsPath(std::string_view packageName, const VFS::Manager* vfs)
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{
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std::string path(packageName);
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std::replace(path.begin(), path.end(), '.', '/');
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std::string pathWithInit = path + "/init.lua";
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path.append(".lua");
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if (vfs->exists(path))
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return path;
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else if (vfs->exists(pathWithInit))
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return pathWithInit;
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else
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throw std::runtime_error("module not found: " + std::string(packageName));
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}
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static std::filesystem::path packageNameToPath(
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std::string_view packageName, const std::vector<std::filesystem::path>& searchDirs)
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{
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std::string path(packageName);
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std::replace(path.begin(), path.end(), '.', '/');
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std::string pathWithInit = path + "/init.lua";
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path.append(".lua");
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for (const auto& base : searchDirs)
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{
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std::filesystem::path p1 = base / path;
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if (std::filesystem::exists(p1))
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return p1;
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std::filesystem::path p2 = base / pathWithInit;
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if (std::filesystem::exists(p2))
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return p2;
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}
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throw std::runtime_error("module not found: " + std::string(packageName));
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}
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static const std::string safeFunctions[] = { "assert", "error", "ipairs", "next", "pairs", "pcall", "select",
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"tonumber", "tostring", "type", "unpack", "xpcall", "rawequal", "rawget", "rawset", "setmetatable" };
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static const std::string safePackages[] = { "coroutine", "math", "string", "table", "utf8" };
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static constexpr int64_t countHookStep = 1000;
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bool LuaState::sProfilerEnabled = true;
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void LuaState::countHook(lua_State* L, lua_Debug* ar)
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{
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LuaState* self;
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(void)lua_getallocf(L, reinterpret_cast<void**>(&self));
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if (self->mActiveScriptIdStack.empty())
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return;
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const ScriptId& activeScript = self->mActiveScriptIdStack.back();
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activeScript.mContainer->addInstructionCount(activeScript.mIndex, countHookStep);
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self->mWatchdogInstructionCounter += countHookStep;
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if (self->mSettings.mInstructionLimit > 0
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&& self->mWatchdogInstructionCounter > self->mSettings.mInstructionLimit)
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{
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lua_pushstring(L,
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"Lua instruction count exceeded, probably an infinite loop in a script. "
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"To change the limit set \"[Lua] instruction limit per call\" in settings.cfg");
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lua_error(L);
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}
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}
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void* LuaState::trackingAllocator(void* ud, void* ptr, size_t osize, size_t nsize)
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{
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LuaState* self = static_cast<LuaState*>(ud);
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const uint64_t smallAllocSize = self->mSettings.mSmallAllocMaxSize;
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const uint64_t memoryLimit = self->mSettings.mMemoryLimit;
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if (!ptr)
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osize = 0;
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int64_t smallAllocDelta = 0, bigAllocDelta = 0;
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if (osize <= smallAllocSize)
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smallAllocDelta -= osize;
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else
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bigAllocDelta -= osize;
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if (nsize <= smallAllocSize)
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smallAllocDelta += nsize;
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else
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bigAllocDelta += nsize;
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if (bigAllocDelta > 0 && memoryLimit > 0 && self->mTotalMemoryUsage + nsize - osize > memoryLimit)
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{
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Log(Debug::Error) << "Lua realloc " << osize << "->" << nsize
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<< " is blocked because Lua memory limit (configurable in settings.cfg) is exceeded";
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return nullptr;
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}
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void* newPtr = nullptr;
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if (nsize == 0)
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free(ptr);
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else
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{
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newPtr = realloc(ptr, nsize);
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if (!newPtr)
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{
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Log(Debug::Error) << "Lua realloc " << osize << "->" << nsize << " failed";
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return nullptr;
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}
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}
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self->mTotalMemoryUsage += smallAllocDelta + bigAllocDelta;
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self->mSmallAllocMemoryUsage += smallAllocDelta;
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if (bigAllocDelta != 0)
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{
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auto it = osize > smallAllocSize ? self->mBigAllocOwners.find(ptr) : self->mBigAllocOwners.end();
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ScriptId id;
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if (it != self->mBigAllocOwners.end())
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{
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if (it->second.mContainer)
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id = ScriptId{ *it->second.mContainer, it->second.mScriptIndex };
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if (ptr != newPtr || nsize <= smallAllocSize)
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self->mBigAllocOwners.erase(it);
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}
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else if (bigAllocDelta > 0)
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{
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if (!self->mActiveScriptIdStack.empty())
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id = self->mActiveScriptIdStack.back();
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bigAllocDelta = nsize;
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}
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if (id.mIndex >= 0)
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{
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if (static_cast<size_t>(id.mIndex) >= self->mMemoryUsage.size())
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self->mMemoryUsage.resize(id.mIndex + 1);
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self->mMemoryUsage[id.mIndex] += bigAllocDelta;
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}
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if (id.mContainer)
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{
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id.mContainer->addMemoryUsage(id.mIndex, bigAllocDelta);
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if (newPtr && nsize > smallAllocSize)
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self->mBigAllocOwners.emplace(newPtr, AllocOwner{ id.mContainer->mThis, id.mIndex });
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}
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}
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return newPtr;
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}
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lua_State* LuaState::createLuaRuntime(LuaState* luaState)
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{
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if (sProfilerEnabled)
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{
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Log(Debug::Info) << "Initializing LuaUtil::LuaState with profiler";
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lua_State* L = lua_newstate(&trackingAllocator, luaState);
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if (L)
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return L;
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else
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{
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sProfilerEnabled = false;
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Log(Debug::Error)
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<< "Failed to initialize LuaUtil::LuaState with custom allocator; disabling Lua profiler";
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}
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}
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Log(Debug::Info) << "Initializing LuaUtil::LuaState without profiler";
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lua_State* L = luaL_newstate();
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if (!L)
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throw std::runtime_error("Can't create Lua runtime");
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return L;
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}
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LuaState::LuaState(const VFS::Manager* vfs, const ScriptsConfiguration* conf, const LuaStateSettings& settings)
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: mSettings(settings)
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, mLuaHolder(createLuaRuntime(this))
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, mSol(mLuaHolder.get())
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, mConf(conf)
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, mVFS(vfs)
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{
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if (sProfilerEnabled)
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lua_sethook(mLuaHolder.get(), &countHook, LUA_MASKCOUNT, countHookStep);
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mSol.open_libraries(sol::lib::base, sol::lib::coroutine, sol::lib::math, sol::lib::bit32, sol::lib::string,
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sol::lib::table, sol::lib::os, sol::lib::debug);
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#ifndef NO_LUAJIT
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mSol.open_libraries(sol::lib::jit);
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#endif // NO_LUAJIT
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mSol["math"]["randomseed"](static_cast<unsigned>(std::time(nullptr)));
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mSol["math"]["randomseed"] = [] {};
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mSol["utf8"] = LuaUtf8::initUtf8Package(mSol);
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mSol["writeToLog"] = [](std::string_view s) { Log(Debug::Level::Info) << s; };
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mSol["setEnvironment"]
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= [](const sol::environment& env, const sol::function& fn) { sol::set_environment(env, fn); };
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mSol["loadFromVFS"] = [this](std::string_view packageName) {
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return loadScriptAndCache(packageNameToVfsPath(packageName, mVFS));
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};
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mSol["loadInternalLib"] = [this](std::string_view packageName) { return loadInternalLib(packageName); };
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// Some fixes for compatibility between different Lua versions
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if (mSol["unpack"] == sol::nil)
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mSol["unpack"] = mSol["table"]["unpack"];
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else if (mSol["table"]["unpack"] == sol::nil)
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mSol["table"]["unpack"] = mSol["unpack"];
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if (LUA_VERSION_NUM <= 501)
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{
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mSol.script(R"(
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local _pairs = pairs
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local _ipairs = ipairs
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pairs = function(v) return (rawget(getmetatable(v) or {}, '__pairs') or _pairs)(v) end
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ipairs = function(v) return (rawget(getmetatable(v) or {}, '__ipairs') or _ipairs)(v) end
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)");
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}
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mSol.script(R"(
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local printToLog = function(...)
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local strs = {}
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for i = 1, select('#', ...) do
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strs[i] = tostring(select(i, ...))
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end
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return writeToLog(table.concat(strs, '\t'))
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end
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printGen = function(name) return function(...) return printToLog(name, ...) end end
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function requireGen(env, loaded, loadFn)
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return function(packageName)
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local p = loaded[packageName]
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if p == nil then
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local loader = loadFn(packageName)
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setEnvironment(env, loader)
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p = loader(packageName)
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loaded[packageName] = p
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end
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return p
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end
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end
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function createStrictIndexFn(tbl)
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return function(_, key)
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local res = tbl[key]
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if res ~= nil then
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return res
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else
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error('Key not found: '..tostring(key), 2)
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end
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end
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end
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function pairsForReadOnly(v)
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local nextFn, t, firstKey = pairs(getmetatable(v).t)
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return function(_, k) return nextFn(t, k) end, v, firstKey
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end
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function ipairsForReadOnly(v)
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local nextFn, t, firstKey = ipairs(getmetatable(v).t)
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return function(_, k) return nextFn(t, k) end, v, firstKey
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end
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function lenForReadOnly(v)
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return #getmetatable(v).t
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end
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local function nextForArray(array, index)
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index = (index or 0) + 1
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if index <= #array then
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return index, array[index]
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end
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end
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function ipairsForArray(array)
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return nextForArray, array, 0
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end
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getmetatable('').__metatable = false
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getSafeMetatable = function(v)
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if type(v) ~= 'table' then error('getmetatable is allowed only for tables', 2) end
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return getmetatable(v)
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end
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)");
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mSandboxEnv = sol::table(mSol, sol::create);
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mSandboxEnv["_VERSION"] = mSol["_VERSION"];
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for (const std::string& s : safeFunctions)
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{
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if (mSol[s] == sol::nil)
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throw std::logic_error("Lua function not found: " + s);
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mSandboxEnv[s] = mSol[s];
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}
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for (const std::string& s : safePackages)
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{
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if (mSol[s] == sol::nil)
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throw std::logic_error("Lua package not found: " + s);
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mCommonPackages[s] = mSandboxEnv[s] = makeReadOnly(mSol[s]);
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}
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mSandboxEnv["getmetatable"] = mSol["getSafeMetatable"];
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mCommonPackages["os"] = mSandboxEnv["os"]
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= makeReadOnly(tableFromPairs<std::string_view, sol::function>({ { "date", mSol["os"]["date"] },
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{ "difftime", mSol["os"]["difftime"] }, { "time", mSol["os"]["time"] } }));
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}
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sol::table makeReadOnly(const sol::table& table, bool strictIndex)
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{
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if (table == sol::nil)
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return table;
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if (table.is<sol::userdata>())
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return table; // it is already userdata, no sense to wrap it again
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lua_State* luaState = table.lua_state();
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sol::state_view lua(luaState);
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sol::table meta(lua, sol::create);
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meta["t"] = table;
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if (strictIndex)
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meta["__index"] = lua["createStrictIndexFn"](table);
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else
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meta["__index"] = table;
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meta["__pairs"] = lua["pairsForReadOnly"];
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meta["__ipairs"] = lua["ipairsForReadOnly"];
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meta["__len"] = lua["lenForReadOnly"];
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lua_newuserdata(luaState, 0);
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sol::stack::push(luaState, meta);
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lua_setmetatable(luaState, -2);
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return sol::stack::pop<sol::table>(luaState);
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}
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sol::table getMutableFromReadOnly(const sol::userdata& ro)
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{
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return ro[sol::metatable_key].get<sol::table>()["t"];
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}
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void LuaState::addCommonPackage(std::string packageName, sol::object package)
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{
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if (!package.is<sol::function>())
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package = makeReadOnly(std::move(package));
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mCommonPackages.insert_or_assign(std::move(packageName), std::move(package));
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}
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sol::protected_function_result LuaState::runInNewSandbox(const std::string& path, const std::string& namePrefix,
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const std::map<std::string, sol::object>& packages, const sol::object& hiddenData)
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{
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sol::protected_function script = loadScriptAndCache(path);
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sol::environment env(mSol, sol::create, mSandboxEnv);
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std::string envName = namePrefix + "[" + path + "]:";
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env["print"] = mSol["printGen"](envName);
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env["_G"] = env;
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env[sol::metatable_key]["__metatable"] = false;
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ScriptId scriptId;
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if (hiddenData.is<sol::table>())
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scriptId = hiddenData.as<sol::table>()
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.get<sol::optional<ScriptId>>(ScriptsContainer::sScriptIdKey)
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.value_or(ScriptId{});
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auto maybeRunLoader = [&hiddenData, scriptId](const sol::object& package) -> sol::object {
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if (package.is<sol::function>())
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return call(scriptId, package.as<sol::function>(), hiddenData);
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else
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return package;
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};
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sol::table loaded(mSol, sol::create);
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for (const auto& [key, value] : mCommonPackages)
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loaded[key] = maybeRunLoader(value);
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for (const auto& [key, value] : packages)
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loaded[key] = maybeRunLoader(value);
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env["require"] = mSol["requireGen"](env, loaded, mSol["loadFromVFS"]);
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sol::set_environment(env, script);
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return call(scriptId, script);
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}
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sol::environment LuaState::newInternalLibEnvironment()
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{
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sol::environment env(mSol, sol::create, mSandboxEnv);
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sol::table loaded(mSol, sol::create);
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for (const std::string& s : safePackages)
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loaded[s] = static_cast<sol::object>(mSandboxEnv[s]);
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env["require"] = mSol["requireGen"](env, loaded, mSol["loadInternalLib"]);
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return env;
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}
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sol::protected_function_result LuaState::throwIfError(sol::protected_function_result&& res)
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{
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if (!res.valid())
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throw std::runtime_error(std::string("Lua error: ") += res.get<sol::error>().what());
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else
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return std::move(res);
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}
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sol::function LuaState::loadScriptAndCache(const std::string& path)
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{
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auto iter = mCompiledScripts.find(path);
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if (iter != mCompiledScripts.end())
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{
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sol::load_result res = mSol.load(iter->second.as_string_view(), path, sol::load_mode::binary);
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// Unless we have memory corruption issues, the bytecode is valid at this point, but loading might still
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// fail because we've hit our Lua memory cap
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if (!res.valid())
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throw std::runtime_error("Lua error: " + res.get<std::string>());
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return res;
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}
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sol::function res = loadFromVFS(path);
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mCompiledScripts[path] = res.dump();
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return res;
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}
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sol::function LuaState::loadFromVFS(const std::string& path)
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{
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std::string fileContent(std::istreambuf_iterator<char>(*mVFS->get(path)), {});
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sol::load_result res = mSol.load(fileContent, path, sol::load_mode::text);
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if (!res.valid())
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throw std::runtime_error(std::string("Lua error: ") += res.get<sol::error>().what());
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return res;
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}
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sol::function LuaState::loadInternalLib(std::string_view libName)
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{
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const auto path = packageNameToPath(libName, mLibSearchPaths);
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std::ifstream stream(path);
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std::string fileContent(std::istreambuf_iterator<char>(stream), {});
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sol::load_result res = mSol.load(fileContent, Files::pathToUnicodeString(path), sol::load_mode::text);
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if (!res.valid())
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throw std::runtime_error("Lua error: " + res.get<std::string>());
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return res;
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}
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std::string getLuaVersion()
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{
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#ifdef NO_LUAJIT
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return LUA_RELEASE;
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#else
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return LUA_RELEASE " (" LUAJIT_VERSION ")";
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#endif
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}
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std::string toString(const sol::object& obj)
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{
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if (obj == sol::nil)
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return "nil";
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else if (obj.get_type() == sol::type::string)
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return "\"" + obj.as<std::string>() + "\"";
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else
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return call(sol::state_view(obj.lua_state())["tostring"], obj);
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}
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std::string internal::formatCastingError(const sol::object& obj, const std::type_info& t)
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{
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const char* typeName = t.name();
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if (t == typeid(int))
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typeName = "int";
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else if (t == typeid(unsigned))
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typeName = "uint32";
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else if (t == typeid(size_t))
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typeName = "size_t";
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else if (t == typeid(float))
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typeName = "float";
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else if (t == typeid(double))
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typeName = "double";
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else if (t == typeid(sol::table))
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typeName = "sol::table";
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else if (t == typeid(sol::function) || t == typeid(sol::protected_function))
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typeName = "sol::function";
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else if (t == typeid(std::string) || t == typeid(std::string_view))
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typeName = "string";
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return std::string("Value \"") + toString(obj) + std::string("\" can not be casted to ") + typeName;
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}
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}
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