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use index 0 for header of list of free references

This commit is contained in:
Roberto Ierusalimschy 2010-08-03 17:21:16 -03:00
parent fd4b4a2a68
commit cd6c276e41
1 changed files with 7 additions and 7 deletions
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14
lauxlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.218 2010/07/02 12:01:53 roberto Exp roberto $
** $Id: lauxlib.c,v 1.219 2010/07/28 15:51:59 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -434,7 +434,7 @@ LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
*/
/* index of free-list header */
#define freelist "lua-freelist"
#define freelist 0
LUALIB_API int luaL_ref (lua_State *L, int t) {
@ -444,12 +444,12 @@ LUALIB_API int luaL_ref (lua_State *L, int t) {
lua_pop(L, 1); /* remove from stack */
return LUA_REFNIL; /* `nil' has a unique fixed reference */
}
lua_getfield(L, t, freelist); /* get first free element */
ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
lua_rawgeti(L, t, freelist); /* get first free element */
ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
lua_pop(L, 1); /* remove it from stack */
if (ref != 0) { /* any free element? */
lua_rawgeti(L, t, ref); /* remove it from list */
lua_setfield(L, t, freelist); /* (t[freelist] = t[ref]) */
lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */
}
else /* no free elements */
ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */
@ -461,10 +461,10 @@ LUALIB_API int luaL_ref (lua_State *L, int t) {
LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
if (ref >= 0) {
t = lua_absindex(L, t);
lua_getfield(L, t, freelist);
lua_rawgeti(L, t, freelist);
lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
lua_pushinteger(L, ref);
lua_setfield(L, t, freelist); /* t[freelist] = ref */
lua_rawseti(L, t, freelist); /* t[freelist] = ref */
}
}