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message handler always adds a traceback to messages (even if they 

are not strings), unless they have a __tostring method.
This commit is contained in:
Roberto Ierusalimschy 2014-10-20 16:19:26 -02:00
parent 57559547a3
commit 961760c9b6
1 changed files with 14 additions and 14 deletions
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28
lua.c
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@ -1,5 +1,5 @@
/*
** $Id: lua.c,v 1.214 2014/09/25 14:20:37 roberto Exp roberto $
** $Id: lua.c,v 1.215 2014/10/17 16:28:21 roberto Exp roberto $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
@ -158,32 +158,32 @@ static void l_message (const char *pname, const char *msg) {
/*
** Check whether 'status' is not OK and, if so, prints the error
** message on the top of the stack. Because this function can be called
** unprotected, it only accepts actual strings as error messages. (A
** coercion could raise a memory error.)
** message on the top of the stack.
*/
static int report (lua_State *L, int status) {
if (status != LUA_OK) {
const char *msg = (lua_type(L, -1) == LUA_TSTRING)
? lua_tostring(L, -1)
: "(error object is not a string)";
const char *msg = lua_tostring(L, -1);
l_message(progname, msg);
lua_pop(L, 1);
lua_pop(L, 1); /* remove message */
}
return status;
}
/*
** Message handler to be used to run all chunks
** Message handler used to run all chunks
*/
static int msghandler (lua_State *L) {
const char *msg = lua_tostring(L, 1);
if (msg) /* is error object a string? */
luaL_traceback(L, L, msg, 1); /* use standard traceback */
else /* non-string error object */
luaL_callmeta(L, 1, "__tostring"); /* try its 'tostring' metamethod */
/* if no metamethod, original object still is in the stack */
if (msg == NULL) { /* is error object not a string? */
if (luaL_callmeta(L, 1, "__tostring") && /* did have a metamethod */
lua_type(L, -1) == LUA_TSTRING) /* and it produce a string? */
return 1; /* that is the message */
else
msg = lua_pushfstring(L, "(error object is a %s value)",
luaL_typename(L, 1));
}
luaL_traceback(L, L, msg, 1); /* append a standard traceback */
return 1;
}