From 7b1fba69b7a887e37e57744309299d134e76e06e Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 7 Nov 2016 10:38:35 -0200
Subject: using 'lastfree == NULL' to signal that table is using the dummy node
 for its hash part + new macro 'allocsizenode'

---
 ltable.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'ltable.h')

diff --git a/ltable.h b/ltable.h
index bad66516..8b80a6df 100644
--- a/ltable.h
+++ b/ltable.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.h,v 2.20 2014/09/04 18:15:29 roberto Exp roberto $
+** $Id: ltable.h,v 2.21 2015/11/03 15:47:30 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -27,6 +27,14 @@
 #define invalidateTMcache(t)	((t)->flags = 0)
 
 
+/* true when 't' is using 'dummynode' as its hash part */
+#define isdummy(t)		((t)->lastfree == NULL)
+
+
+/* allocated size for hash nodes */
+#define allocsizenode(t)	(isdummy(t) ? 0 : sizenode(t))
+
+
 /* returns the key, given the value of a table entry */
 #define keyfromval(v) \
   (gkey(cast(Node *, cast(char *, (v)) - offsetof(Node, i_val))))
@@ -51,7 +59,7 @@ LUAI_FUNC int luaH_getn (Table *t);
 
 #if defined(LUA_DEBUG)
 LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
-LUAI_FUNC int luaH_isdummy (Node *n);
+LUAI_FUNC int luaH_isdummy (const Table *t);
 #endif
 
 
-- 
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