mirror of https://github.com/minetest/minetest.git
156 lines
3.4 KiB
C++
156 lines
3.4 KiB
C++
/*
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Minetest
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Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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Copyright (C) 2021 TurkeyMcMac, Jude Melton-Houghton <jwmhjwmh@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "test.h"
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#include "config.h"
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#include <stdexcept>
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extern "C" {
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#if USE_LUAJIT
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#include <luajit.h>
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#else
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#include <lua.h>
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#endif
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#include <lauxlib.h>
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}
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/*
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* This class tests for two common issues that prevent correct error handling
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* between Lua and C++.
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* Further reading:
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* - https://luajit.org/extensions.html#exceptions
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* - http://lua-users.org/wiki/ErrorHandlingBetweenLuaAndCplusplus
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*/
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class TestLua : public TestBase
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{
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public:
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TestLua() { TestManager::registerTestModule(this); }
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const char *getName() { return "TestLua"; }
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void runTests(IGameDef *gamedef);
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void testLuaDestructors();
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void testCxxExceptions();
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};
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static TestLua g_test_instance;
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void TestLua::runTests(IGameDef *gamedef)
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{
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TEST(testLuaDestructors);
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TEST(testCxxExceptions);
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}
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////////////////////////////////////////////////////////////////////////////////
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/*
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Check that Lua unwinds the stack correctly when it throws errors internally.
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(This is not the case with PUC Lua unless it was compiled as C++.)
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*/
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namespace
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{
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class DestructorDetector {
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bool *did_destruct;
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public:
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DestructorDetector(bool *did_destruct) : did_destruct(did_destruct)
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{
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*did_destruct = false;
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}
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~DestructorDetector()
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{
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*did_destruct = true;
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}
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};
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}
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void TestLua::testLuaDestructors()
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{
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bool did_destruct = false;
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lua_State *L = luaL_newstate();
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lua_cpcall(L, [](lua_State *L) -> int {
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DestructorDetector d(reinterpret_cast<bool*>(lua_touserdata(L, 1)));
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luaL_error(L, "error");
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return 0;
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}, &did_destruct);
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lua_close(L);
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UASSERT(did_destruct);
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}
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namespace {
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int wrapper(lua_State *L, lua_CFunction inner)
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{
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try {
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return inner(L);
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} catch (std::exception &e) {
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lua_pushstring(L, e.what());
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return lua_error(L);
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}
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}
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}
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/*
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Check that C++ exceptions are caught and re-thrown as Lua errors.
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This is handled by a wrapper we define ourselves.
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(PUC Lua does not support use of such a wrapper, we have a patched version)
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*/
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void TestLua::testCxxExceptions()
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{
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lua_State *L = luaL_newstate();
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#if USE_LUAJIT
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lua_pushlightuserdata(L, reinterpret_cast<void*>(wrapper));
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luaJIT_setmode(L, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_ON);
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lua_pop(L, 1);
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#else
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lua_atccall(L, wrapper);
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#endif
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lua_pushcfunction(L, [](lua_State *L) -> int {
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throw std::runtime_error("example");
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});
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int caught = 0;
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std::string errmsg;
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try {
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if (lua_pcall(L, 0, 0, 0) != 0) {
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caught = 2;
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errmsg = lua_isstring(L, -1) ? lua_tostring(L, -1) : "";
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}
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} catch (std::exception &e) {
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caught = 1;
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}
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if (caught != 1)
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lua_close(L);
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UASSERTEQ(int, caught, 2);
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UASSERT(errmsg.find("example") != std::string::npos);
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}
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