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avoid reserving LUA_RIDX_LAST slots in any table used by reference 

system. Store free list in a field indexed by a unique name,
instead of using a numerical index.
This commit is contained in:
Roberto Ierusalimschy 2010-05-10 12:25:02 -03:00
parent 2d81cfa4e1
commit dcc070683c
1 changed files with 9 additions and 15 deletions
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24
lauxlib.c
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@ -1,5 +1,5 @@
/*
** $Id: lauxlib.c,v 1.207 2010/04/09 16:14:46 roberto Exp roberto $
** $Id: lauxlib.c,v 1.208 2010/04/14 15:14:21 roberto Exp roberto $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
@ -436,8 +436,8 @@ LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
** =======================================================
*/
/* number of prereserved references (for internal use) */
#define FREELIST_REF (LUA_RIDX_LAST + 1) /* free list of references */
/* index of free-list header */
#define freelist "lua-freelist"
LUALIB_API int luaL_ref (lua_State *L, int t) {
@ -447,21 +447,15 @@ 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_rawgeti(L, t, FREELIST_REF); /* get first free element */
lua_getfield(L, t, freelist); /* get first free element */
ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
lua_pop(L, 1); /* remove it from stack */
if (ref != 0) { /* any free element? */
lua_rawgeti(L, t, ref); /* remove it from list */
lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */
lua_setfield(L, t, freelist); /* (t[freelist] = t[ref]) */
}
else { /* no free elements */
else /* no free elements */
ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */
if (ref == FREELIST_REF) { /* FREELIST_REF not initialized? */
lua_pushinteger(L, 0);
lua_rawseti(L, t, FREELIST_REF);
ref = FREELIST_REF + 1;
}
}
lua_rawseti(L, t, ref);
return ref;
}
@ -470,10 +464,10 @@ 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 = abs_index(L, t);
lua_rawgeti(L, t, FREELIST_REF);
lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
lua_getfield(L, t, freelist);
lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
lua_pushinteger(L, ref);
lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
lua_setfield(L, t, freelist); /* t[freelist] = ref */
}
}