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default metatable can be NULL

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Roberto Ierusalimschy
2003-12-01 16:22:56 -02:00
parent 1d10acb355
commit af850484a9
8 changed files with 34 additions and 34 deletions
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19
lapi.c
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@@ -1,5 +1,5 @@
/*
** $Id: lapi.c,v 1.248 2003/10/20 12:25:23 roberto Exp roberto $
** $Id: lapi.c,v 1.249 2003/10/20 17:42:41 roberto Exp roberto $
** Lua API
** See Copyright Notice in lua.h
*/
@@ -555,7 +555,7 @@ LUA_API int lua_getmetatable (lua_State *L, int objindex) {
mt = uvalue(obj)->uv.metatable;
break;
}
if (mt == NULL || mt == hvalue(defaultmeta(L)))
if (mt == NULL)
res = 0;
else {
sethvalue(L->top, mt);
@@ -634,21 +634,26 @@ LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
LUA_API int lua_setmetatable (lua_State *L, int objindex) {
TObject *obj, *mt;
TObject *obj;
Table *mt;
int res = 1;
lua_lock(L);
api_checknelems(L, 1);
obj = luaA_index(L, objindex);
api_checkvalidindex(L, obj);
mt = (!ttisnil(L->top - 1)) ? L->top - 1 : defaultmeta(L);
api_check(L, ttistable(mt));
if (ttisnil(L->top - 1))
mt = NULL;
else {
api_check(L, ttistable(L->top - 1));
mt = hvalue(L->top - 1);
}
switch (ttype(obj)) {
case LUA_TTABLE: {
hvalue(obj)->metatable = hvalue(mt); /* write barrier */
hvalue(obj)->metatable = mt; /* write barrier */
break;
}
case LUA_TUSERDATA: {
uvalue(obj)->uv.metatable = hvalue(mt); /* write barrier */
uvalue(obj)->uv.metatable = mt; /* write barrier */
break;
}
default: {