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https://github.com/scp-fs2open/fs2open.github.com.git
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asarium
08c6e0d072
This is necessary after all to properly clean up resources if an operation becomes invalid. Also bumps Visual Studio version to 2017 on Appveyor.
122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
#include "LuaThread.h"
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#include "LuaException.h"
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#include <utility>
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namespace luacpp {
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LuaThread LuaThread::create(lua_State* L, const LuaFunction& func)
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{
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auto luaThread = lua_newthread(L);
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func.pushValue(L);
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// Move the main function to the thread (I have no idea what this actually does but the Lua code does the same...)
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lua_xmove(L, luaThread, 1);
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LuaThread thread(L, luaThread);
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thread.setReference(UniqueLuaReference::create(L));
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lua_pop(L, 1);
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return thread;
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}
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LuaThread::LuaThread() = default;
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LuaThread::LuaThread(lua_State* luaState, lua_State* thread) : LuaValue(luaState), _thread(thread) {}
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LuaThread::LuaThread(const LuaThread&) = default;
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LuaThread& LuaThread::operator=(const LuaThread&) = default;
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// These should be noexcept but Visual Studio doesn't like that yet in a recent enough version
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LuaThread::LuaThread(LuaThread&&) = default; // NOLINT(performance-noexcept-move-constructor)
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LuaThread& LuaThread::operator=(LuaThread&&) = default; // NOLINT(performance-noexcept-move-constructor)
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LuaThread::~LuaThread() = default;
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void LuaThread::setReference(const LuaReference& ref)
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{
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lua_State* L = ref->getState();
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ref->pushValue(L);
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if (lua_type(L, -1) != LUA_TTHREAD) {
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lua_pop(L, 1);
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throw LuaException("Reference does not refer to a thread!");
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} else {
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lua_pop(L, 1);
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LuaValue::setReference(ref);
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}
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}
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LuaThread::ResumeState LuaThread::resume(const LuaValueList& params) const
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{
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int nargs = static_cast<int>(params.size());
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for (const auto& val : params) {
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val.pushValue(_luaState);
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}
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// Move parameters to the thread
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lua_xmove(_luaState, _thread, nargs);
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// now resume
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const auto result = lua_resume(_thread, nargs);
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if (result != 0 && result != LUA_YIELD) {
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if (_errorCallback) {
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if (_errorCallback(_luaState, _thread)) {
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// If the error was handled just pretend that we resumed successfully
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ResumeState resume;
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resume.completed = true;
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return resume;
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}
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}
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throw LuaException("Lua coroutine failed to resume!");
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}
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LuaValueList returnVals;
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auto numRet = lua_gettop(_thread);
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returnVals.reserve(numRet);
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// Move the values back to the main state so that it uses the right state
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auto previousStack = lua_gettop(_luaState); // Keep this for cleaning up later
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lua_xmove(_thread, _luaState, numRet);
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auto retValsStart = previousStack + 1; // We need to start at + 1 since that is where the first return val would be
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for (int i = retValsStart; i <= previousStack + numRet; ++i) {
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LuaValue val;
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convert::popValue(_luaState, val, i, false);
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returnVals.push_back(std::move(val));
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}
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// Cleanup the stack
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lua_settop(_luaState, previousStack);
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ResumeState state;
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state.completed = result != LUA_YIELD;
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state.returnVals = std::move(returnVals);
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return state;
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}
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void LuaThread::setErrorCallback(LuaThread::ErrorCallback errorCallback) { _errorCallback = std::move(errorCallback); }
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lua_State* LuaThread::getThreadHandle() const { return _thread; }
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bool convert::popValue(lua_State* luaState, LuaThread& target, int stackposition, bool remove)
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{
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if (!internal::isValidIndex(luaState, stackposition)) {
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return false;
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}
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if (!lua_isthread(luaState, stackposition)) {
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return false;
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} else {
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target.setReference(UniqueLuaReference::create(luaState, stackposition));
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if (remove) {
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lua_remove(luaState, stackposition);
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}
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return true;
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}
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}
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} // namespace luacpp
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