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collect dead indices in tables

This commit is contained in:
Roberto Ierusalimschy 2000-06-05 17:07:53 -03:00
parent dbfb810267
commit c542aac0b9
3 changed files with 28 additions and 3 deletions
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4
lgc.c
View File

@ -1,5 +1,5 @@
/*
** $Id: lgc.c,v 1.53 2000/05/30 19:00:31 roberto Exp roberto $
** $Id: lgc.c,v 1.54 2000/06/05 14:56:18 roberto Exp roberto $
** Garbage Collector
** See Copyright Notice in lua.h
*/
@ -64,6 +64,8 @@ static void tablemark (lua_State *L, Hash *h) {
for (i=h->size-1; i>=0; i--) {
Node *n = node(h,i);
if (ttype(key(n)) != TAG_NIL) {
if (ttype(val(n)) == TAG_NIL)
luaH_remove(h, key(n)); /* dead element; try to remove it */
markobject(L, &n->key);
markobject(L, &n->val);
}

24
ltable.c
View File

@ -1,5 +1,5 @@
/*
** $Id: ltable.c,v 1.42 2000/05/11 18:57:19 roberto Exp roberto $
** $Id: ltable.c,v 1.43 2000/05/24 13:54:49 roberto Exp roberto $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/
@ -121,6 +121,28 @@ int luaH_pos (lua_State *L, const Hash *t, const TObject *key) {
(int)(((const char *)v - (const char *)(&t->node[0].val))/sizeof(Node));
}
/*
** try to remove a key without value from a table. To avoid problems with
** hash, change `key' for a number with the same hash.
*/
void luaH_remove (Hash *t, TObject *key) {
/* do not remove numbers */
if (ttype(key) != TAG_NUMBER) {
/* try to find a number `n' with the same hash as `key' */
Node *mp = luaH_mainposition(t, key);
int n = mp - &t->node[0];
/* make sure `n' is not in `t' */
while (luaH_getnum(t, n) != &luaO_nilobject) {
if (t->size >= MAX_INT-n)
return; /* give up; (to avoid overflow) */
n += t->size;
}
ttype(key) = TAG_NUMBER;
nvalue(key) = n;
LUA_ASSERT(L, luaH_mainposition(t, key) == mp, "cannot change hash");
}
}
static void setnodevector (lua_State *L, Hash *t, lint32 size) {
int i;

3
ltable.h
View File

@ -1,5 +1,5 @@
/*
** $Id: ltable.h,v 1.19 2000/04/25 16:55:09 roberto Exp roberto $
** $Id: ltable.h,v 1.20 2000/05/08 19:32:53 roberto Exp roberto $
** Lua tables (hash)
** See Copyright Notice in lua.h
*/
@ -21,6 +21,7 @@ void luaH_free (lua_State *L, Hash *t);
const TObject *luaH_get (lua_State *L, const Hash *t, const TObject *key);
const TObject *luaH_getnum (const Hash *t, Number key);
const TObject *luaH_getstr (const Hash *t, TString *key);
void luaH_remove (Hash *t, TObject *key);
void luaH_set (lua_State *L, Hash *t, const TObject *key, const TObject *val);
int luaH_pos (lua_State *L, const Hash *t, const TObject *r);
void luaH_setint (lua_State *L, Hash *t, int key, const TObject *val);