static void zero_weak_boxes(GCTYPE *gc, int is_late, int force_zero)
{
GC_Weak_Box *wb;
wb = gc->weak_boxes[is_late];
while (wb) {
if (force_zero || !is_marked(gc, wb->val)) {
wb->val = NULL;
if (wb->secondary_erase) {
void **p;
mpage *page;
/* it's possible for the secondary to be in an old generation
and therefore on an mprotected page: */
page = pagemap_find_page(gc->page_maps, wb->secondary_erase);
if (page->mprotected) {
page->mprotected = 0;
mmu_write_unprotect_page(gc->mmu, page->addr, APAGE_SIZE);
GC_MP_CNT_INC(mp_mark_cnt);
}
p = (void **)GC_resolve2(wb->secondary_erase, gc);
*(p + wb->soffset) = NULL;
wb->secondary_erase = NULL;
}
}
wb = wb->next;
}
/* reset, in case we have a second round */
gc->weak_boxes[is_late] = NULL;
}
static int zero_weak_boxes(GCTYPE *gc, int is_late, int force_zero, int from_inc, int fuel)
{
GC_Weak_Box *wb;
int num_gen0;
if (from_inc) {
wb = gc->inc_weak_boxes[is_late];
num_gen0 = 0;
} else {
wb = append_weak_boxes(gc->weak_boxes[is_late],
gc->bp_weak_boxes[is_late],
&num_gen0);
if (gc->gc_full || !gc->started_incremental)
num_gen0 = 0;
}
while (wb) {
GC_ASSERT(is_marked(gc, wb));
if (!wb->val) {
/* nothing to do */
} else if (force_zero || !is_marked(gc, wb->val)) {
wb->val = NULL;
if (wb->secondary_erase) {
void **p;
mpage *page;
/* it's possible for the secondary to be in an old generation
and therefore on an mprotected page: */
page = pagemap_find_page(gc->page_maps, wb->secondary_erase);
if (page->mprotected) {
page->mprotected = 0;
mmu_write_unprotect_page(gc->mmu, page->addr, APAGE_SIZE, page_mmu_type(page), &page->mmu_src_block);
page->reprotect_next = gc->reprotect_next;
gc->reprotect_next = page;
page->reprotect = 1;
}
p = (void **)GC_resolve2(wb->secondary_erase, gc);
*(p + wb->soffset) = NULL;
wb->secondary_erase = NULL;
}
} else {
wb->val = GC_resolve2(wb->val, gc);
}
if (num_gen0 > 0) {
if (!is_in_generation_half(gc, wb)) {
/* For incremental mode, preserve this weak box
in the incremental list for re-checking later. */
check_weak_box_not_already_in_inc_chain(wb, gc->inc_weak_boxes[wb->is_late]);
wb->inc_next = gc->inc_weak_boxes[is_late];
gc->inc_weak_boxes[is_late] = wb;
}
}
if (from_inc) {
GC_Weak_Box *next;
next = wb->inc_next;
wb->inc_next = gc->weak_incremental_done;
wb = next;
} else
wb = wb->next;
num_gen0--;
if (fuel >= 0) {
if (fuel > 0)
fuel--;
else {
GC_ASSERT(from_inc);
gc->inc_weak_boxes[is_late] = wb;
return 0;
}
}
}
/* reset, in case we have a second round */
if (from_inc) {
gc->inc_weak_boxes[is_late] = NULL;
} else {
gc->weak_boxes[is_late] = NULL;
gc->bp_weak_boxes[is_late] = NULL;
}
return fuel;
}