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bug: __newindex metamethod may not work if metatable is its own 

metatable.
This commit is contained in:
Roberto Ierusalimschy 2011-08-17 17:38:51 -03:00
parent 89b59eee73
commit 8a008a2057
1 changed files with 29 additions and 2 deletions
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31
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@ -1880,8 +1880,8 @@ patch = [[
+++ lundump.c 2008/04/04 19:51:41 2.7.1.4 +++ lundump.c 2008/04/04 19:51:41 2.7.1.4
@@ -1,5 +1,5 @@ @@ -1,5 +1,5 @@
/* /*
-** $Id: bugs,v 1.108 2010/05/14 15:34:57 roberto Exp roberto $ -** $Id: bugs,v 1.109 2011/01/31 14:52:32 roberto Exp roberto $
+** $Id: bugs,v 1.108 2010/05/14 15:34:57 roberto Exp roberto $ +** $Id: bugs,v 1.109 2011/01/31 14:52:32 roberto Exp roberto $
** load precompiled Lua chunks ** load precompiled Lua chunks
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -2359,3 +2359,30 @@ patch = [[
break; break;
]] ]]
} }
Bug{
what = [[__newindex metamethod may not work if metatable is its own
metatable]],
report = [[Cuero Bugot, 2011/08/09]],
since = [[5.1]],
example = [[
meta={}
setmetatable(meta, meta)
meta.__newindex = function(t, key, value) print("set") end
o = setmetatable({}, meta)
o.x = 10 -- should print 'set'
]],
patch = [[
--- lvm.c 2009/07/01 21:10:33 2.63.1.4
+++ lvm.c 2011/08/17 20:36:28
@@ -142,6 +142,7 @@
if (!ttisnil(oldval) || /* result is no nil? */
(tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
setobj2t(L, oldval, val);
+ h->flags = 0;
luaC_barriert(L, h, val);
return;
}
]]
}