lua_createtable() array problem
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- Subject: lua_createtable() array problem
- From: Iain Hibbert <plunky@...>
- Date: 2011年1月18日 21:01:41 +0000 (GMT)
Hi,
I'm using Lua 5.1.4 [now imported in NetBSD] and trying to have a C
function create an array of items, but have found that it is causing the
Lua interpreter to coredump on exit.
I've googled a bit but found no comments about that and am wondering if
this is a generic thing or just local? My basic test module is attached,
triggering a failure is as easy as calling the function and exiting..
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> ^D
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> test.settable(0,0)
> ^D
Segmentation fault (core dumped)
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> test.settable(1,0)
> ^D
Segmentation fault (core dumped)
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> test.settable(2,0)
> ^D
Segmentation fault (core dumped)
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> test.settable(1,0)
> ^D
Segmentation fault (core dumped)
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> test.settable(0,1)
> ^D
% lua
Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
> require("test")
> test.settable(1,1)
> ^D
%
note the last two - if any number of nonarray elements is given, then the
interpreter exits without any problem, as it does for adding nonarray
elements. using lua_rawseti() instead causes the same coredump..
gdb reports me the following backtrace
Program terminated with signal 11, Segmentation fault.
#0 0xbbb1115a in _malloc_prefork () from /usr/lib/libc.so.12
(gdb) bt
#0 0xbbb1115a in _malloc_prefork () from /usr/lib/libc.so.12
#1 0xbbb1144b in free () from /usr/lib/libc.so.12
#2 0x08054ba8 in l_alloc (ud=0x0, ptr=0xbba799e8, osize=28, nsize=0)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lauxlib.c:633
#3 0x0805769c in luaM_realloc_ (L=0xbb909040, block=0xbba799e8, osize=28, nsize=0)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lmem.c:81
#4 0x080640cc in luaH_free (L=0xbb909040, t=0xbb95da60)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/ltable.c:378
#5 0x0805863e in freeobj (L=0xbb909040, o=0xbb95da60)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lgc.c:385
#6 0x0805874c in sweeplist (L=0xbb909040, p=0xbb9090cc, count=4294967292)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lgc.c:426
#7 0x08058a16 in luaC_freeall (L=0xbb909040)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lgc.c:489
#8 0x08054f63 in close_state (L=0xbb909040)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lstate.c:110
#9 0x08055373 in lua_close (L=0xbb909040)
at /var/cvs/NetBSD-current/src/external/mit/lua/dist/src/lstate.c:214
#10 0x08049a6d in main ()
any clues if I might be doing something wrong here?
iain/*
* testing createtable
*/
#include <lauxlib.h>
#include <lua.h>
static int
Tsettable(lua_State *L)
{
lua_createtable(L, luaL_optint(L, 1, 0), luaL_optint(L, 2, 0));
lua_pushinteger(L, 1);
lua_pushstring(L, "using settable");
lua_settable(L, -3);
return 1;
}
static int
Trawseti(lua_State *L)
{
lua_createtable(L, luaL_optint(L, 1, 0), luaL_optint(L, 2, 0));
lua_pushstring(L, "using rawseti");
lua_rawseti(L, -2, 1);
return 1;
}
LUALIB_API int luaopen_test(lua_State *);
static const luaL_Reg LRtest[] = {
{ "settable", Tsettable },
{ "rawseti", Trawseti },
{ NULL, NULL },
};
LUALIB_API int
luaopen_test(lua_State *L)
{
luaL_register(L, "test", LRtest);
return 1;
}