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avoid using index 0 for free list of references (because it is not

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as efficient as index 1...)
This commit is contained in:
Roberto Ierusalimschy
2006-09-25 12:35:00 -03:00
parent 3c8865cf66
commit 285f926140
1 changed files with 8 additions and 2 deletions
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10
lauxlib.c
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@@ -1,5 +1,5 @@
/* /*
** $Id: lauxlib.c,v 1.161 2006/09/18 14:03:18 roberto Exp roberto $ ** $Id: lauxlib.c,v 1.162 2006/09/22 20:24:38 roberto Exp roberto $
** Auxiliary functions for building Lua libraries ** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@@ -25,7 +25,11 @@
#include "lauxlib.h" #include "lauxlib.h"
#define FREELIST_REF 0 /* free list of references */ /* number of prereserved references (for internal use) */
#define RESERVED_REFS 1 /* only FREELIST_REF is reserved */
#define FREELIST_REF 1 /* free list of references */
/* convert a stack index to positive */ /* convert a stack index to positive */
@@ -494,6 +498,8 @@ LUALIB_API int luaL_ref (lua_State *L, int t) {
} }
else { /* no free elements */ else { /* no free elements */
ref = (int)lua_objlen(L, t); ref = (int)lua_objlen(L, t);
if (ref < RESERVED_REFS)
ref = RESERVED_REFS; /* skip reserved references */
ref++; /* create new reference */ ref++; /* create new reference */
} }
lua_rawseti(L, t, ref); lua_rawseti(L, t, ref);