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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@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 "common/c_internal.h"
#include "debug.h"
#include "log.h"
#include "settings.h"
std::string script_get_backtrace(lua_State *L)
{
std::string s;
lua_getglobal(L, "debug");
if(lua_istable(L, -1)){
lua_getfield(L, -1, "traceback");
if(lua_isfunction(L, -1)) {
lua_call(L, 0, 1);
if(lua_isstring(L, -1)){
s = lua_tostring(L, -1);
}
}
lua_pop(L, 1);
}
lua_pop(L, 1);
return s;
}
int script_error_handler(lua_State *L) {
lua_getglobal(L, "debug");
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
return 1;
}
lua_getfield(L, -1, "traceback");
if (!lua_isfunction(L, -1)) {
lua_pop(L, 2);
return 1;
}
lua_pushvalue(L, 1);
lua_pushinteger(L, 2);
lua_call(L, 2, 1);
return 1;
}
int script_exception_wrapper(lua_State *L, lua_CFunction f)
{
try {
return f(L); // Call wrapped function and return result.
} catch (const char *s) { // Catch and convert exceptions.
lua_pushstring(L, s);
} catch (std::exception &e) {
lua_pushstring(L, e.what());
}
return lua_error(L); // Rethrow as a Lua error.
}
/*
* Note that we can't get tracebacks for LUA_ERRMEM or LUA_ERRERR (without
* hacking Lua internals). For LUA_ERRMEM, this is because memory errors will
* not execute the the error handler, and by the time lua_pcall returns the
* execution stack will have already been unwound. For LUA_ERRERR, there was
* another error while trying to generate a backtrace from a LUA_ERRRUN. It is
* presumed there is an error with the internal Lua state and thus not possible
* to gather a coherent backtrace. Realistically, the best we can do here is
* print which C function performed the failing pcall.
*/
void script_error(lua_State *L, int pcall_result, const char *fxn)
{
if (pcall_result == 0)
return;
const char *err_type;
switch (pcall_result) {
case LUA_ERRRUN:
err_type = "Runtime";
break;
case LUA_ERRMEM:
err_type = "OOM";
break;
case LUA_ERRERR:
err_type = "Double fault";
break;
default:
err_type = "Unknown";
}
const char *err_descr = lua_tostring(L, -1);
if (!err_descr)
err_descr = "<no description>";
std::string err_msg(err_type);
if (fxn) {
err_msg += " error in ";
err_msg += fxn;
err_msg += "(): ";
} else {
err_msg += " error: ";
}
err_msg += err_descr;
if (pcall_result == LUA_ERRMEM) {
err_msg += "\nCurrent Lua memory usage: "
+ itos(lua_gc(L, LUA_GCCOUNT, 0) >> 10) + " MB";
}
throw LuaError(err_msg);
}
// Push the list of callbacks (a lua table).
// Then push nargs arguments.
// Then call this function, which
// - runs the callbacks
// - replaces the table and arguments with the return value,
// computed depending on mode
void script_run_callbacks_f(lua_State *L, int nargs,
RunCallbacksMode mode, const char *fxn)
{
FATAL_ERROR_IF(lua_gettop(L) < nargs + 1, "Not enough arguments");
// Insert error handler
lua_pushcfunction(L, script_error_handler);
int errorhandler = lua_gettop(L) - nargs - 1;
lua_insert(L, errorhandler);
// Insert run_callbacks between error handler and table
lua_getglobal(L, "core");
lua_getfield(L, -1, "run_callbacks");
lua_remove(L, -2);
lua_insert(L, errorhandler + 1);
// Insert mode after table
lua_pushnumber(L, (int) mode);
lua_insert(L, errorhandler + 3);
// Stack now looks like this:
// ... <error handler> <run_callbacks> <table> <mode> <arg#1> <arg#2> ... <arg#n>
int result = lua_pcall(L, nargs + 2, 1, errorhandler);
if (result != 0)
script_error(L, result, fxn);
lua_remove(L, -2); // Remove error handler
}
void log_deprecated(lua_State *L, const std::string &message)
{
static bool configured = false;
static bool dolog = false;
static bool doerror = false;
// performance optimization to not have to read and compare setting for every logline
if (!configured) {
std::string value = g_settings->get("deprecated_lua_api_handling");
if (value == "log") {
dolog = true;
} else if (value == "error") {
dolog = true;
doerror = true;
}
}
if (doerror) {
if (L != NULL) {
script_error(L, LUA_ERRRUN, NULL);
} else {
FATAL_ERROR("Can't do a scripterror for this deprecated message, "
"so exit completely!");
}
}
if (dolog) {
/* abusing actionstream because of lack of file-only-logged loglevel */
actionstream << message << std::endl;
if (L != NULL) {
actionstream << script_get_backtrace(L) << std::endl;
}
}
}
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