bool VMMemPointerIterator::remove_released_region(MemPointerRecord* rec) {
assert(rec->is_deallocation_record(), "Sanity check");
VMMemRegion* cur = (VMMemRegion*)current();
assert(cur->is_reserved_region() && cur->contains_region(rec),
"Sanity check");
if (rec->is_same_region(cur)) {
// In snapshot, the virtual memory records are sorted in following orders:
// 1. virtual memory's base address
// 2. virtual memory reservation record, followed by commit records within this reservation.
// The commit records are also in base address order.
// When a reserved region is released, we want to remove the reservation record and all
// commit records following it.
#ifdef ASSERT
address low_addr = cur->addr();
address high_addr = low_addr + cur->size();
#endif
// remove virtual memory reservation record
remove();
// remove committed regions within above reservation
VMMemRegion* next_region = (VMMemRegion*)current();
while (next_region != NULL && next_region->is_committed_region()) {
assert(next_region->addr() >= low_addr &&
next_region->addr() + next_region->size() <= high_addr,
"Range check");
remove();
next_region = (VMMemRegion*)current();
}
} else if (rec->addr() == cur->addr() ||
rec->addr() + rec->size() == cur->addr() + cur->size()) {
// released region is at either end of this region
cur->exclude_region(rec->addr(), rec->size());
assert(check_reserved_region(), "Integrity check");
} else { // split the reserved region and release the middle
address high_addr = cur->addr() + cur->size();
size_t sz = high_addr - rec->addr();
cur->exclude_region(rec->addr(), sz);
sz = high_addr - rec->addr() - rec->size();
if (MemTracker::track_callsite()) {
MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
((VMMemRegionEx*)cur)->pc());
bool ret = insert_reserved_region(&tmp);
assert(!ret || check_reserved_region(), "Integrity check");
return ret;
} else {
MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
bool ret = insert_reserved_region(&tmp);
assert(!ret || check_reserved_region(), "Integrity check");
return ret;
}
}
return true;
}
bool VMMemPointerIterator::remove_released_region(MemPointerRecord* rec) {
assert(rec->is_deallocation_record(), "Sanity check");
VMMemRegion* cur = (VMMemRegion*)current();
assert(cur->is_reserved_region() && cur->contains_region(rec),
"Sanity check");
if (rec->is_same_region(cur)) {
// release whole reserved region
#ifdef ASSERT
VMMemRegion* next_region = (VMMemRegion*)peek_next();
// should not have any committed memory in this reserved region
assert(next_region == NULL || !next_region->is_committed_region(), "Sanity check");
#endif
remove();
} else if (rec->addr() == cur->addr() ||
rec->addr() + rec->size() == cur->addr() + cur->size()) {
// released region is at either end of this region
cur->exclude_region(rec->addr(), rec->size());
assert(check_reserved_region(), "Integrity check");
} else { // split the reserved region and release the middle
address high_addr = cur->addr() + cur->size();
size_t sz = high_addr - rec->addr();
cur->exclude_region(rec->addr(), sz);
sz = high_addr - rec->addr() - rec->size();
if (MemTracker::track_callsite()) {
MemPointerRecordEx tmp(rec->addr() + rec->size(), cur->flags(), sz,
((VMMemRegionEx*)cur)->pc());
bool ret = insert_reserved_region(&tmp);
assert(!ret || check_reserved_region(), "Integrity check");
return ret;
} else {
MemPointerRecord tmp(rec->addr() + rec->size(), cur->flags(), sz);
bool ret = insert_reserved_region(&tmp);
assert(!ret || check_reserved_region(), "Integrity check");
return ret;
}
}
return true;
}
