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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2021 TurkeyMcMac, Jude Melton-Houghton <jwmhjwmh@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "test.h"
#include "config.h"
#include <stdexcept>
extern "C" {
#if USE_LUAJIT
#include <luajit.h>
#else
#include <lua.h>
#endif
#include <lauxlib.h>
}
/*
* This class tests for two common issues that prevent correct error handling
* between Lua and C++.
* Further reading:
* - https://luajit.org/extensions.html#exceptions
* - http://lua-users.org/wiki/ErrorHandlingBetweenLuaAndCplusplus
*/
class TestLua : public TestBase
{
public:
TestLua() { TestManager::registerTestModule(this); }
const char *getName() { return "TestLua"; }
void runTests(IGameDef *gamedef);
void testLuaDestructors();
void testCxxExceptions();
};
static TestLua g_test_instance;
void TestLua::runTests(IGameDef *gamedef)
{
TEST(testLuaDestructors);
TEST(testCxxExceptions);
}
////////////////////////////////////////////////////////////////////////////////
/*
Check that Lua unwinds the stack correctly when it throws errors internally.
(This is not the case with PUC Lua unless it was compiled as C++.)
*/
namespace
{
class DestructorDetector {
bool *did_destruct;
public:
DestructorDetector(bool *did_destruct) : did_destruct(did_destruct)
{
*did_destruct = false;
}
~DestructorDetector()
{
*did_destruct = true;
}
};
}
void TestLua::testLuaDestructors()
{
bool did_destruct = false;
lua_State *L = luaL_newstate();
lua_cpcall(L, [](lua_State *L) -> int {
DestructorDetector d(reinterpret_cast<bool*>(lua_touserdata(L, 1)));
luaL_error(L, "error");
return 0;
}, &did_destruct);
lua_close(L);
UASSERT(did_destruct);
}
namespace {
int wrapper(lua_State *L, lua_CFunction inner)
{
try {
return inner(L);
} catch (std::exception &e) {
lua_pushstring(L, e.what());
return lua_error(L);
}
}
}
/*
Check that C++ exceptions are caught and re-thrown as Lua errors.
This is handled by a wrapper we define ourselves.
(PUC Lua does not support use of such a wrapper, we have a patched version)
*/
void TestLua::testCxxExceptions()
{
lua_State *L = luaL_newstate();
#if USE_LUAJIT
lua_pushlightuserdata(L, reinterpret_cast<void*>(wrapper));
luaJIT_setmode(L, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_ON);
lua_pop(L, 1);
#else
lua_atccall(L, wrapper);
#endif
lua_pushcfunction(L, [](lua_State *L) -> int {
throw std::runtime_error("example");
});
int caught = 0;
std::string errmsg;
try {
if (lua_pcall(L, 0, 0, 0) != 0) {
caught = 2;
errmsg = lua_isstring(L, -1) ? lua_tostring(L, -1) : "";
}
} catch (std::exception &e) {
caught = 1;
}
if (caught != 1)
lua_close(L);
UASSERTEQ(int, caught, 2);
UASSERT(errmsg.find("example") != std::string::npos);
}
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