//private static GCObject nullp = null; //FIXME:see nullp in global_State
/*
** sweep at most 'count' elements from a list of GCObjects erasing dead
** objects, where a dead (not alive) object is one marked with the "old"
** (non current) white and not fixed.
** In non-generational mode, change all non-dead objects back to white,
** preparing for next collection cycle.
** In generational mode, keep black objects black, and also mark them as
** old; stop when hitting an old object, as all objects after that
** one will be old too.
** When object is a thread, sweep its list of open upvalues too.
*/
private static GCObjectRef sweeplist(lua_State L, GCObjectRef p, lu_mem count)
{
global_State g = G(L);
int ow = otherwhite(g);
int toclear, toset; /* bits to clear and to set in all live objects */
int tostop; /* stop sweep when this is true */
l_mem debt = g.GCdebt; /* current debt */
if (isgenerational(g)) /* generational mode? */
{
toclear = ~0; /* clear nothing */
toset = bitmask(OLDBIT); /* set the old bit of all surviving objects */
tostop = bitmask(OLDBIT); /* do not sweep old generation */
}
else /* normal mode */
{
toclear = maskcolors; /* clear all color bits + old bit */
toset = luaC_white(g); /* make object white */
tostop = 0; /* do not stop */
}
while (p.get() != null && count-- > 0)
{
GCObject curr = p.get();
int marked = gch(curr).marked;
if (isdeadm(ow, marked)) /* is 'curr' dead? */
{
p.set(gch(curr).next); /* remove 'curr' from list */
freeobj(L, curr); /* erase 'curr' */
}
else
{
if (gch(curr).tt == LUA_TTHREAD)
{
sweepthread(L, gco2th(curr)); /* sweep thread's upvalues */
}
if (testbits((byte)marked, tostop)) //FIXME:(byte)
//static GCObject *nullp = NULL; //FIXME:moved, see upper
{
p = new NullpRef(g); /* stop sweeping this list */
break;
}
/* update marks */
gch(curr).marked = cast_byte((marked & toclear) | toset);
p = new NextRef(gch(curr)); /* go to next element */
}
}
luaE_setdebt(g, debt); /* sweeping should not change debt */
return(p);
}
