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https://github.com/lua/lua
synced 2024-12-24 03:16:50 +03:00
error handler in 'lua.c' tries '__tostring' metamethod if error
message is not a string
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parent
79cb336d74
commit
4eb49163c6
23
ldblib.c
23
ldblib.c
@ -1,5 +1,5 @@
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/*
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** $Id: ldblib.c,v 1.104 2005/12/29 15:32:11 roberto Exp roberto $
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** $Id: ldblib.c,v 1.105 2006/09/11 14:07:24 roberto Exp roberto $
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** Interface from Lua to its debug API
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** See Copyright Notice in lua.h
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*/
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@ -319,21 +319,18 @@ static int db_debug (lua_State *L) {
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#define LEVELS2 10 /* size of the second part of the stack */
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static int db_errorfb (lua_State *L) {
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int level;
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lua_Debug ar;
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int firstpart = 1; /* still before eventual `...' */
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int arg;
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lua_State *L1 = getthread(L, &arg);
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lua_Debug ar;
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if (lua_isnumber(L, arg+2)) {
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level = (int)lua_tointeger(L, arg+2);
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lua_pop(L, 1);
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}
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else
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level = (L == L1) ? 1 : 0; /* level 0 may be this own function */
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if (lua_gettop(L) == arg)
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lua_pushliteral(L, "");
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else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */
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else lua_pushliteral(L, "\n");
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const char *msg = lua_tostring(L, arg + 1);
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int level = (lua_isnumber(L, arg + 2)) ?
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(int)lua_tointeger(L, arg + 2) :
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(L == L1) ? 1 : 0; /* level 0 may be this own function */
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lua_settop(L, ++arg);
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if (msg) lua_pushfstring(L, "%s\n", msg);
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else if (!lua_isnil(L, arg)) /* is there a non-string 'msg'? */
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return 1; /* return it untouched */
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lua_pushliteral(L, "stack traceback:");
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while (lua_getstack(L1, level++, &ar)) {
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if (level > LEVELS1 && firstpart) {
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39
lua.c
39
lua.c
@ -1,5 +1,5 @@
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/*
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** $Id: lua.c,v 1.163 2006/09/18 14:03:18 roberto Exp roberto $
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** $Id: lua.c,v 1.164 2006/10/10 17:40:17 roberto Exp roberto $
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** Lua stand-alone interpreter
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** See Copyright Notice in lua.h
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*/
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@ -41,7 +41,7 @@ static void laction (int i) {
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static void print_usage (void) {
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fprintf(stderr,
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"usage: %s [options] [script [args]].\n"
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"usage: %s [options] [script [args]]\n"
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"Available options are:\n"
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" -e stat execute string " LUA_QL("stat") "\n"
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" -l name require library " LUA_QL("name") "\n"
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@ -73,20 +73,27 @@ static int report (lua_State *L, int status) {
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}
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static int traceback (lua_State *L) {
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static int gettraceback (lua_State *L) {
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lua_getfield(L, LUA_GLOBALSINDEX, "debug");
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if (!lua_istable(L, -1)) {
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lua_pop(L, 1);
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return 1;
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if (!lua_istable(L, -1)) return 0;
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lua_getfield(L, -1, "traceback"); /* check 'debug.traceback' */
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if (!lua_isfunction(L, -1)) return 0;
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return 1; /* there is a function 'debug.traceback' */
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}
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static int traceback (lua_State *L) {
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if (lua_isnoneornil(L, 1)) /* no error object? */
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return 1; /* keep it that way */
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if (!gettraceback(L)) /* no 'debug.traceback' function? */
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lua_pushvalue(L, 1); /* keep original message */
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else {
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lua_pushvalue(L, 1); /* pass error message */
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lua_pushinteger(L, 2); /* skip this function and traceback */
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lua_call(L, 2, 1); /* call traceback */
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}
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lua_getfield(L, -1, "traceback");
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if (!lua_isfunction(L, -1)) {
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lua_pop(L, 2);
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return 1;
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}
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lua_pushvalue(L, 1); /* pass error message */
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lua_pushinteger(L, 2); /* skip this function and traceback */
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lua_call(L, 2, 1); /* call debug.traceback */
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if (!lua_isstring(L, -1) && !luaL_callmeta(L, 1, "__tostring"))
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lua_pushliteral(L, "(no error message)");
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return 1;
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}
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@ -96,6 +103,7 @@ static int docall (lua_State *L, int narg, int clear) {
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushcfunction(L, traceback); /* push traceback function */
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lua_insert(L, base); /* put it under chunk and args */
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globalL = L; /* to be available to 'laction' */
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signal(SIGINT, laction);
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status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
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signal(SIGINT, SIG_DFL);
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@ -160,7 +168,7 @@ static const char *get_prompt (lua_State *L, int firstline) {
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}
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/* mark in error messages for incomplete statements */
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#define mark LUA_QL("<eof>")
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#define mark "<eof>"
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#define marklen (sizeof(mark) - 1)
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static int incomplete (lua_State *L, int status) {
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@ -344,7 +352,6 @@ static int pmain (lua_State *L) {
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char **argv = s->argv;
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int script;
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int has_i = 0, has_v = 0, has_e = 0;
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globalL = L;
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if (argv[0] && argv[0][0]) progname = argv[0];
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lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
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luaL_openlibs(L); /* open libraries */
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