/* move `dead' udata that need finalization to list `tmudata' */
size_t luaC_separateudata (lua_State *L, int all) {
global_State *g = G(L);
size_t deadmem = 0;
GCObject **p = &g->mainthread->next;
GCObject *curr;
while ((curr = *p) != NULL) {
if (!(iswhite(curr) || all) || isfinalized(gco2u(curr)))
p = &curr->gch.next; /* don't bother with them */
else if (fasttm(L, gco2u(curr)->metatable, TM_GC) == NULL) {
markfinalized(gco2u(curr)); /* don't need finalization */
p = &curr->gch.next;
}
else { /* must call its gc method */
deadmem += sizeudata(gco2u(curr));
markfinalized(gco2u(curr));
*p = curr->gch.next;
/* link `curr' at the end of `tmudata' list */
if (g->tmudata == NULL) /* list is empty? */
g->tmudata = curr->gch.next = curr; /* creates a circular list */
else {
curr->gch.next = g->tmudata->gch.next;
g->tmudata->gch.next = curr;
g->tmudata = curr;
}
}
}
return deadmem;
}
/* move `dead' udata that need finalization to list `tmudata' */
size_t luaC_separateudata (lua_State *L) {
size_t deadmem = 0;
GCObject **p = &G(L)->rootudata;
GCObject *curr;
GCObject *collected = NULL; /* to collect udata with gc event */
GCObject **lastcollected = &collected;
while ((curr = *p) != NULL) {
lua_assert(curr->gch.tt == LUA_TUSERDATA);
if (ismarked(curr) || isfinalized(gcotou(curr)))
p = &curr->gch.next; /* don't bother with them */
else if (fasttm(L, gcotou(curr)->uv.metatable, TM_GC) == NULL) {
markfinalized(gcotou(curr)); /* don't need finalization */
p = &curr->gch.next;
}
else { /* must call its gc method */
deadmem += sizeudata(gcotou(curr)->uv.len);
*p = curr->gch.next;
curr->gch.next = NULL; /* link `curr' at the end of `collected' list */
*lastcollected = curr;
lastcollected = &curr->gch.next;
}
}
/* insert collected udata with gc event into `tmudata' list */
*lastcollected = G(L)->tmudata;
G(L)->tmudata = collected;
return deadmem;
}
void luaC_callGCTM (lua_State *L) {
lu_byte oldah = L->allowhook;
L->allowhook = 0; /* stop debug hooks during GC tag methods */
L->top++; /* reserve space to keep udata while runs its gc method */
while (G(L)->tmudata != NULL) {
GCObject *o = G(L)->tmudata;
Udata *udata = gcotou(o);
G(L)->tmudata = udata->uv.next; /* remove udata from `tmudata' */
udata->uv.next = G(L)->rootudata; /* return it to `root' list */
G(L)->rootudata = o;
setuvalue(L->top - 1, udata); /* keep a reference to it */
unmark(o);
markfinalized(udata);
do1gcTM(L, udata);
}
L->top--;
L->allowhook = oldah; /* restore hooks */
}
/* Free a C data object. */
void LJ_FASTCALL lj_cdata_free(global_State *g, GCcdata *cd)
{
if (LJ_UNLIKELY(cd->marked & LJ_GC_CDATA_FIN)) {
GCobj *root;
makewhite(g, obj2gco(cd));
markfinalized(obj2gco(cd));
if ((root = gcref(g->gc.mmudata)) != NULL) {
setgcrefr(cd->nextgc, root->gch.nextgc);
setgcref(root->gch.nextgc, obj2gco(cd));
setgcref(g->gc.mmudata, obj2gco(cd));
} else {
setgcref(cd->nextgc, obj2gco(cd));
setgcref(g->gc.mmudata, obj2gco(cd));
}
} else if (LJ_LIKELY(!cdataisv(cd))) {
CType *ct = ctype_raw(ctype_ctsG(g), cd->ctypeid);
CTSize sz = ctype_hassize(ct->info) ? ct->size : CTSIZE_PTR;
lua_assert(ctype_hassize(ct->info) || ctype_isfunc(ct->info) ||
ctype_isextern(ct->info));
lj_mem_free(g, cd, sizeof(GCcdata) + sz);
} else {
lj_mem_free(g, memcdatav(cd), sizecdatav(cd));
}
}
void luaC_callGCTM (lua_State *L) {
lu_byte oldah = L->allowhook;
L->allowhook = 0; /* stop debug hooks during GC tag methods */
L->top++; /* reserve space to keep udata while runs its gc method */
#if LUA_REFCOUNT
while (G(L)->tmudata_head.next != (GCObject*)&G(L)->tmudata_tail) {
GCObject *o = G(L)->tmudata_head.next;
Udata *udata = gcotou(o);
G(L)->tmudata_head.next = udata->uv.next; /* remove udata from `tmudata' */
udata->uv.prev = (GCObject*)&G(L)->rootudata_head;
udata->uv.next = G(L)->rootudata_head.next;
if (udata->uv.next)
udata->uv.next->uv.prev = o;
G(L)->rootudata_head.next = o;
#else !LUA_REFCOUNT
while (G(L)->tmudata != NULL) {
GCObject *o = G(L)->tmudata;
Udata *udata = gcotou(o);
G(L)->tmudata = udata->uv.next; /* remove udata from `tmudata' */
udata->uv.next = G(L)->rootudata; /* return it to `root' list */
G(L)->rootudata = o;
#endif LUA_REFCOUNT
setuvalue(L->top - 1, udata); /* keep a reference to it */
unmark(o);
markfinalized(udata);
do1gcTM(L, udata);
}
L->top--;
L->allowhook = oldah; /* restore hooks */
}
void luaC_sweep (lua_State *L, int all) {
if (all) all = 256; /* larger than any mark */
#if LUA_REFCOUNT
sweeplist(L, &G(L)->rootudata_head.next, (GCObject*)&G(L)->rootudata_tail, all);
#else !LUA_REFCOUNT
sweeplist(L, &G(L)->rootudata, NULL, all);
#endif LUA_REFCOUNT
sweepstrings(L, all);
#if LUA_REFCOUNT
sweeplist(L, &G(L)->rootgc_head.next, (GCObject*)&G(L)->rootgc_tail, all);
#else !LUA_REFCOUNT
sweeplist(L, &G(L)->rootgc, NULL, all);
#endif LUA_REFCOUNT
}
/* mark root set */
static void markroot (GCState *st, lua_State *L) {
int i;
global_State *g = st->g;
markobject(st, defaultmeta(L));
for (i = 0; i < LUA_NTYPES; i++)
{
markobject(st, defaultmetatypes(L, i));
}
markobject(st, registry(L));
traversestack(st, g->mainthread);
if (L != g->mainthread) /* another thread is running? */
markvalue(st, L); /* cannot collect it */
if (G(L)->userGCFunction)
{
st->L = g->mainthread;
G(L)->userGCFunction(st);
}
}
static void marktmu (GCState *st) {
GCObject *u;
#if LUA_REFCOUNT
for (u = st->g->tmudata_head.next; u != (GCObject*)&st->g->tmudata_tail; u = u->gch.next) {
#else !LUA_REFCOUNT
for (u = st->g->tmudata; u; u = u->gch.next) {
#endif LUA_REFCOUNT
unmark(u); /* may be marked, if left from previous GC */
reallymarkobject(st, u);
}
}
/* move `dead' udata that need finalization to list `tmudata' */
size_t luaC_separateudata (lua_State *L) {
size_t deadmem = 0;
#if LUA_REFCOUNT
GCObject **p = &G(L)->rootudata_head.next;
#else !LUA_REFCOUNT
GCObject **p = &G(L)->rootudata;
#endif LUA_REFCOUNT
GCObject *curr;
GCObject *collected = NULL; /* to collect udata with gc event */
#if !LUA_REFCOUNT
GCObject **lastcollected = &collected;
while ((curr = *p) != NULL) {
lua_assert(curr->gch.tt == LUA_TUSERDATA);
#else LUA_REFCOUNT
while ((curr = *p) != (GCObject*)&G(L)->rootudata_tail) {
#endif LUA_REFCOUNT
if (ismarked(curr) || isfinalized(gcotou(curr)))
p = &curr->gch.next; /* don't bother with them */
else if (fasttm(L, gcotou(curr)->uv.metatable, TM_GC) == NULL) {
markfinalized(gcotou(curr)); /* don't need finalization */
p = &curr->gch.next;
}
else { /* must call its gc method */
deadmem += sizeudata(gcotou(curr)->uv.len);
*p = curr->gch.next;
#if LUA_REFCOUNT
Unlink(curr);
curr->gch.next = (GCObject*)&G(L)->tmudata_tail; /* link `curr' at the end of `collected' list */
curr->gch.prev = G(L)->tmudata_tail.prev;
G(L)->tmudata_tail.prev->gch.next = curr;
G(L)->tmudata_tail.prev = curr;
#else !LUA_REFCOUNT
curr->gch.next = NULL; /* link `curr' at the end of `collected' list */
*lastcollected = curr;
lastcollected = &curr->gch.next;
#endif LUA_REFCOUNT
}
}
/* insert collected udata with gc event into `tmudata' list */
#if LUA_REFCOUNT
// *lastcollected = G(L)->tmudata_head.next;
// G(L)->tmudata_head.next = collected;
#else !LUA_REFCOUNT
*lastcollected = G(L)->tmudata;
G(L)->tmudata = collected;
#endif LUA_REFCOUNT
return deadmem;
}
static void removekey (lua_State *L, Node *n) {
(void)L;
setnilvalue(gval(n)); /* remove corresponding value ... */
if (iscollectable(gkey(n)))
setttype(gkey(n), LUA_TNONE); /* dead key; remove it */
}
