static void push_and_mark_object(void *p)
{
GC_normal_finalize_mark_proc(p);
while (!GC_mark_stack_empty()) {
MARK_FROM_MARK_STACK();
}
GC_set_mark_bit(p);
if (GC_mark_state != MS_NONE) {
while (!GC_mark_some(0)) {
/* Empty. */
}
}
}
/* and invoke finalizers. */
void GC_finalize()
{
struct disappearing_link * curr_dl, * prev_dl, * next_dl;
struct finalizable_object * curr_fo, * prev_fo, * next_fo;
ptr_t real_ptr, real_link;
size_t i;
size_t dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size);
size_t fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
/* PLTSCHEME: for resetting the disapearing link */
/* PLTSCHEME: it's important to "push roots again" before
making disappearing links disappear, because this
step includes marking from ephemerons whose keys are
reachable. We want to mark before disappearing links
are disappeared. */
if (GC_push_last_roots_again) GC_push_last_roots_again();
/* Make disappearing links disappear */
for (i = 0; i < dl_size; i++) {
curr_dl = dl_head[i];
prev_dl = 0;
while (curr_dl != 0) {
/* PLTSCHEME: skip late dls: */
if (curr_dl->dl_kind == LATE_DL) {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
continue;
}
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
if (!GC_is_marked(real_ptr)) {
*(word *)real_link = 0;
next_dl = dl_next(curr_dl);
if (prev_dl == 0) {
dl_head[i] = next_dl;
} else {
dl_set_next(prev_dl, next_dl);
}
GC_clear_mark_bit((ptr_t)curr_dl);
GC_dl_entries--;
curr_dl = next_dl;
} else {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
}
}
}
/* PLTSCHEME: All eagers first */
/* Enqueue for finalization all EAGER objects that are still */
/* unreachable. */
GC_bytes_finalized = 0;
finalize_eagers(1);
if (GC_push_last_roots_again) GC_push_last_roots_again();
finalize_eagers(2);
if (GC_push_last_roots_again) GC_push_last_roots_again();
/* Mark all objects reachable via chains of 1 or more pointers */
/* from finalizable objects. */
/* PLTSCHEME: non-eager finalizations only (eagers already marked) */
# ifdef PRINTSTATS
GC_ASSERT(GC_mark_state == MS_NONE);
# endif
for (i = 0; i < fo_size; i++) {
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
if (!(curr_fo -> eager_level)) { /* PLTSCHEME */
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
if (!GC_is_marked(real_ptr)) {
(*(curr_fo -> fo_mark_proc))(real_ptr);
while (!GC_mark_stack_empty()) MARK_FROM_MARK_STACK();
if (GC_mark_state != MS_NONE) {
/* Mark stack overflowed. Very unlikely. */
# ifdef PRINTSTATS
if (GC_mark_state != MS_INVALID) ABORT("Bad mark state");
GC_printf("Mark stack overflowed in finalization!!\n");
# endif
/* Make mark bits consistent again. Forget about */
/* finalizing this object for now. */
GC_set_mark_bit(real_ptr);
while (!GC_mark_some((ptr_t)0));
}
#if 0
if (GC_is_marked(real_ptr)) {
/* PLTSCHEME: we have some ok cycles (below a parent) */
printf("Finalization cycle involving %lx\n", real_ptr);
}
#endif
}
}
}
}
/* Enqueue for finalization all objects that are still */
/* unreachable. */
/* GC_bytes_finalized = 0; */ /* PLTSCHEME: done above */
for (i = 0; i < fo_size; i++) {
curr_fo = fo_head[i];
prev_fo = 0;
while (curr_fo != 0) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
if (!GC_is_marked(real_ptr)) {
GC_set_mark_bit(real_ptr);
/* Delete from hash table */
next_fo = fo_next(curr_fo);
if (prev_fo == 0) {
fo_head[i] = next_fo;
} else {
fo_set_next(prev_fo, next_fo);
}
GC_fo_entries--;
/* Add to list of objects awaiting finalization. */
fo_set_next(curr_fo, GC_finalize_now);
GC_finalize_now = curr_fo;
/* unhide object pointer so any future collections will */
/* see it. */
curr_fo -> fo_hidden_base =
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
GC_bytes_finalized +=
curr_fo -> fo_object_size
+ sizeof(struct finalizable_object);
curr_fo = next_fo;
} else {
prev_fo = curr_fo;
curr_fo = fo_next(curr_fo);
}
}
}
/* Remove dangling disappearing links. */
for (i = 0; i < dl_size; i++) {
curr_dl = dl_head[i];
prev_dl = 0;
while (curr_dl != 0) {
real_link = GC_base((ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link));
if (real_link != 0 && !GC_is_marked(real_link)) {
next_dl = dl_next(curr_dl);
if (prev_dl == 0) {
dl_head[i] = next_dl;
} else {
dl_set_next(prev_dl, next_dl);
}
GC_clear_mark_bit((ptr_t)curr_dl);
GC_dl_entries--;
curr_dl = next_dl;
} else {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
}
}
}
/* PLTSCHEME: late disappearing links */
for (i = 0; i < dl_size; i++) {
curr_dl = dl_head[i];
prev_dl = 0;
while (curr_dl != 0) {
/* PLTSCHEME: only late dls: */
if (curr_dl->dl_kind != LATE_DL) {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
continue;
}
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
if (!GC_is_marked(real_ptr)) {
*(word *)real_link = 0;
next_dl = dl_next(curr_dl);
if (prev_dl == 0) {
dl_head[i] = next_dl;
} else {
dl_set_next(prev_dl, next_dl);
}
GC_clear_mark_bit((ptr_t)curr_dl);
GC_dl_entries--;
curr_dl = next_dl;
} else {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
}
}
}
/* PLTSCHEME: */
if (GC_custom_finalize)
GC_custom_finalize();
}
/* PLTSCHEME: eager finalization: */
static void finalize_eagers(int eager_level)
{
struct finalizable_object * curr_fo, * prev_fo, * next_fo;
struct finalizable_object * end_eager_mark;
ptr_t real_ptr;
int i;
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
end_eager_mark = GC_finalize_now; /* PLTSCHEME */
for (i = 0; i < fo_size; i++) {
curr_fo = fo_head[i];
prev_fo = 0;
while (curr_fo != 0) {
if (curr_fo -> eager_level == eager_level) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
if (!GC_is_marked(real_ptr)) {
/* We assume that (non-eager) finalization orders do not
need to take into account connections through memory
with eager finalizations. Otherwise, this mark bit
could break the chain from one (non-eager) finalizeable
to another. */
GC_set_mark_bit(real_ptr);
/* Delete from hash table */
next_fo = fo_next(curr_fo);
if (prev_fo == 0) {
fo_head[i] = next_fo;
} else {
fo_set_next(prev_fo, next_fo);
}
GC_fo_entries--;
/* Add to list of objects awaiting finalization. */
fo_set_next(curr_fo, GC_finalize_now);
GC_finalize_now = curr_fo;
/* unhide object pointer so any future collections will */
/* see it. */
curr_fo -> fo_hidden_base =
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
GC_bytes_finalized +=
curr_fo -> fo_object_size
+ sizeof(struct finalizable_object);
# ifdef PRINTSTATS
if (!GC_is_marked((ptr_t)curr_fo)) {
ABORT("GC_finalize: found accessible unmarked object\n");
}
# endif
curr_fo = next_fo;
} else {
prev_fo = curr_fo;
curr_fo = fo_next(curr_fo);
}
} else {
prev_fo = curr_fo;
curr_fo = fo_next(curr_fo);
}
}
}
/* PLTSCHEME: Mark from queued eagers: */
for (curr_fo = GC_finalize_now; curr_fo != end_eager_mark; curr_fo = fo_next(curr_fo)) {
/* PLTSCHEME: if this is an eager finalization, then objects
accessible from real_ptr need to be marked */
if (curr_fo -> eager_level == eager_level) {
(*(curr_fo -> fo_mark_proc))(curr_fo -> fo_hidden_base);
while (!GC_mark_stack_empty()) MARK_FROM_MARK_STACK();
if (GC_mark_state != MS_NONE) {
/* Mark stack overflowed. Very unlikely.
Everything's ok, though. Just mark from scratch. */
while (!GC_mark_some((ptr_t)0));
}
}
}
}
