in hash nodes, keys are stored in separate pieces to avoid wasting

space with alignments

ltable.h

@@ -1,5 +1,5 @@
 /*
-** $Id: ltable.h,v 2.23 2016/12/22 13:08:50 roberto Exp roberto $
+** $Id: ltable.h,v 2.24 2017/05/19 12:48:15 roberto Exp roberto $
 ** Lua tables (hash)
 ** See Copyright Notice in lua.h
 */
@@ -12,18 +12,9 @@
 
 #define gnode(t,i)	(&(t)->node[i])
 #define gval(n)		(&(n)->i_val)
-#define gnext(n)	((n)->i_key.nk.next)
+#define gnext(n)	((n)->u.next)
 
 
-/* 'const' to avoid wrong writings that can mess up field 'next' */
-#define gkey(n)		cast(const TValue*, (&(n)->i_key.tvk))
-
-/*
-** writable version of 'gkey'; allows updates to individual fields,
-** but not to the whole (which has incompatible type)
-*/
-#define wgkey(n)		(&(n)->i_key.nk)
-
 #define invalidateTMcache(t)	((t)->flags = 0)
 
 
@@ -35,9 +26,8 @@
 #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))))
+/* returns the Node, given the value of a table entry */
+#define nodefromval(v) 	cast(Node *, (v))
 
 
 LUAI_FUNC const TValue *luaH_getint (Table *t, lua_Integer key);