Re: Lua 5 stack traceback / unwind
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Re: Lua 5 stack traceback / unwind
- From: Wim Couwenberg <w.couwenberg@...>
- Date: 2005年4月05日 20:48:47 +0200
In lua 5, we are using luaL_loadbuffer followed by lua_pcall. If there
is an error, there is no stack trace back.
How do we implement this in lua 5?
Have a look at debug.traceback, it is also stored under the global name
_TRACEBACK (in 5.0.2 at least, didn't check 5.1). You can provide it as
an error handler in lua_pcall something like this:
/* stack layout: func arg1 ... argn */
/* provide traceback function */
lua_pushstring(L, "_TRACEBACK");
lua_gettable(L, LUA_GLOBALSINDEX);
lua_insert(L, -n - 2);
/* stack layout: _TRACEBACK func arg1 ... argn */
/* call func with error handler */
if (lua_pcall(L, n, 0, -n - 2))
{
/* an error with stack traceback is now at tos */
}
The traceback function will still be on the stack after lua_pcall.
--
Wim