From 69dd9461e5aeb98fe9bbc71f1e81859d03ec8a34 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 28 Feb 2003 16:45:15 -0300
Subject: bug: GC metamethod calls could mess C/Lua stack syncronization

---
 lgc.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

(limited to 'lgc.h')

diff --git a/lgc.h b/lgc.h
index 78adf69a..8e3a3257 100644
--- a/lgc.h
+++ b/lgc.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lgc.h,v 1.17 2002/11/25 12:38:47 roberto Exp roberto $
+** $Id: lgc.h,v 1.18 2003/02/10 17:32:50 roberto Exp roberto $
 ** Garbage Collector
 ** See Copyright Notice in lua.h
 */
@@ -11,8 +11,8 @@
 #include "lobject.h"
 
 
-#define luaC_checkGC(L) if (G(L)->nblocks >= G(L)->GCthreshold) \
-			  luaC_collectgarbage(L)
+#define luaC_checkGC(L) { lua_assert(!(L->ci->state & CI_CALLING)); \
+	if (G(L)->nblocks >= G(L)->GCthreshold) luaC_collectgarbage(L); }
 
 
 void luaC_separateudata (lua_State *L);
-- 
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