void GarbageCollector::unmark_all(GCData& data) {
UnmarkVisitor visit(object_memory_);
visit_roots(data.roots(), visit);
visit_call_frames_list(data.call_frames(), visit);
for(capi::Handles::Iterator i(*data.handles()); i.more(); i.advance()) {
visit.call(i->object());
}
for(capi::Handles::Iterator i(*data.cached_handles()); i.more(); i.advance()) {
visit.call(i->object());
}
visit.drain_stack();
}
void ImmixGC::collect(GCData& data) {
Object* tmp;
gc_.clear_lines();
for(Roots::Iterator i(data.roots()); i.more(); i.advance()) {
tmp = i->get();
if(tmp->reference_p()) {
saw_object(tmp);
}
}
for(capi::Handles::Iterator i(*data.handles()); i.more(); i.advance()) {
if(!i->weak_p()) saw_object(i->object());
}
for(capi::Handles::Iterator i(*data.cached_handles()); i.more(); i.advance()) {
if(!i->weak_p()) saw_object(i->object());
}
for(VariableRootBuffers::Iterator i(data.variable_buffers());
i.more(); i.advance()) {
Object*** buffer = i->buffer();
for(int idx = 0; idx < i->size(); idx++) {
Object** var = buffer[idx];
Object* tmp = *var;
if(tmp->reference_p() && tmp->young_object_p()) {
saw_object(tmp);
}
}
}
// Walk all the call frames
for(CallFrameLocationList::const_iterator i = data.call_frames().begin();
i != data.call_frames().end();
i++) {
CallFrame** loc = *i;
walk_call_frame(*loc);
}
gc_.process_mark_stack(allocator_);
// Sweep up the garbage
gc_.sweep_blocks();
// This resets the allocator state to sync it up with the BlockAllocator
// properly.
allocator_.get_new_block();
ObjectArray *current_rs = object_memory->remember_set;
int cleared = 0;
for(ObjectArray::iterator oi = current_rs->begin();
oi != current_rs->end();
oi++) {
tmp = *oi;
// unremember_object throws a NULL in to remove an object
// so we don't have to compact the set in unremember
if(tmp) {
assert(tmp->zone == MatureObjectZone);
assert(!tmp->forwarded_p());
if(!tmp->marked_p()) {
cleared++;
*oi = NULL;
}
}
}
// Switch the which_mark_ for next time.
which_mark_ = (which_mark_ == 1 ? 2 : 1);
#ifdef IMMIX_DEBUG
std::cout << "Immix: RS size cleared: " << cleared << "\n";
immix::Chunks& chunks = gc_.block_allocator().chunks();
std::cout << "chunks=" << chunks.size() << "\n";
immix::AllBlockIterator iter(chunks);
int blocks_seen = 0;
int total_objects = 0;
int total_object_bytes = 0;
while(immix::Block* block = iter.next()) {
blocks_seen++;
std::cout << "block " << block << ", holes=" << block->holes() << " "
<< "objects=" << block->objects() << " "
<< "object_bytes=" << block->object_bytes() << " "
<< "frag=" << block->fragmentation_ratio()
<< "\n";
total_objects += block->objects();
total_object_bytes += block->object_bytes();
}
std::cout << blocks_seen << " blocks\n";
std::cout << gc_.bytes_allocated() << " bytes allocated\n";
std::cout << total_object_bytes << " object bytes / " << total_objects << " objects\n";
int* holes = new int[10];
for(int i = 0; i < 10; i++) {
holes[i] = 0;
}
immix::AllBlockIterator iter2(chunks);
while(immix::Block* block = iter2.next()) {
int h = block->holes();
if(h > 9) h = 9;
holes[h]++;
}
std::cout << "== hole stats ==\n";
for(int i = 0; i < 10; i++) {
if(holes[i] > 0) {
std::cout << i << ": " << holes[i] << "\n";
}
}
#endif
}
void ImmixGC::collect(GCData& data) {
Object* tmp;
gc_.clear_lines();
int via_handles_ = 0;
int via_roots = 0;
int via_stack = 0;
int callframes = 0;
for(Roots::Iterator i(data.roots()); i.more(); i.advance()) {
tmp = i->get();
if(tmp->reference_p()) saw_object(tmp);
via_roots++;
}
if(data.threads()) {
for(std::list<ManagedThread*>::iterator i = data.threads()->begin();
i != data.threads()->end();
i++) {
for(Roots::Iterator ri((*i)->roots()); ri.more(); ri.advance()) {
ri->set(saw_object(ri->get()));
}
}
}
for(capi::Handles::Iterator i(*data.handles()); i.more(); i.advance()) {
if(i->in_use_p() && !i->weak_p()) {
saw_object(i->object());
via_handles_++;
}
}
for(capi::Handles::Iterator i(*data.cached_handles()); i.more(); i.advance()) {
if(i->in_use_p() && !i->weak_p()) {
saw_object(i->object());
via_handles_++;
}
}
std::list<capi::Handle**>* gh = data.global_handle_locations();
if(gh) {
for(std::list<capi::Handle**>::iterator i = gh->begin();
i != gh->end();
i++) {
capi::Handle** loc = *i;
if(capi::Handle* hdl = *loc) {
if(!CAPI_REFERENCE_P(hdl)) continue;
if(hdl->valid_p()) {
Object* obj = hdl->object();
if(obj && obj->reference_p()) {
saw_object(obj);
via_handles_++;
}
} else {
std::cerr << "Detected bad handle checking global capi handles\n";
}
}
}
}
for(VariableRootBuffers::Iterator i(data.variable_buffers());
i.more(); i.advance()) {
Object*** buffer = i->buffer();
for(int idx = 0; idx < i->size(); idx++) {
Object** var = buffer[idx];
Object* tmp = *var;
via_stack++;
if(tmp->reference_p() && tmp->young_object_p()) {
saw_object(tmp);
}
}
}
// Walk all the call frames
for(CallFrameLocationList::const_iterator i = data.call_frames().begin();
i != data.call_frames().end();
i++) {
callframes++;
CallFrame** loc = *i;
walk_call_frame(*loc);
}
gc_.process_mark_stack(allocator_);
// We've now finished marking the entire object graph.
check_finalize();
// Finalize can cause more things to continue to live, so we must
// check the mark_stack again.
gc_.process_mark_stack(allocator_);
// Sweep up the garbage
gc_.sweep_blocks();
// This resets the allocator state to sync it up with the BlockAllocator
// properly.
allocator_.get_new_block();
ObjectArray *current_rs = object_memory_->remember_set();
int cleared = 0;
for(ObjectArray::iterator oi = current_rs->begin();
oi != current_rs->end();
oi++) {
tmp = *oi;
// unremember_object throws a NULL in to remove an object
// so we don't have to compact the set in unremember
if(tmp) {
assert(tmp->zone() == MatureObjectZone);
assert(!tmp->forwarded_p());
if(!tmp->marked_p(object_memory_->mark())) {
cleared++;
*oi = NULL;
}
}
}
for(std::list<gc::WriteBarrier*>::iterator wbi = object_memory_->aux_barriers().begin();
wbi != object_memory_->aux_barriers().end();
wbi++) {
gc::WriteBarrier* wb = *wbi;
ObjectArray* rs = wb->remember_set();
for(ObjectArray::iterator oi = rs->begin();
oi != rs->end();
oi++) {
tmp = *oi;
if(tmp) {
assert(tmp->zone() == MatureObjectZone);
assert(!tmp->forwarded_p());
if(!tmp->marked_p(object_memory_->mark())) {
cleared++;
*oi = NULL;
}
}
}
}
// Now, calculate how much space we're still using.
immix::Chunks& chunks = gc_.block_allocator().chunks();
immix::AllBlockIterator iter(chunks);
int live_bytes = 0;
int total_bytes = 0;
while(immix::Block* block = iter.next()) {
total_bytes += immix::cBlockSize;
live_bytes += block->bytes_from_lines();
}
double percentage_live = (double)live_bytes / (double)total_bytes;
if(object_memory_->state->shared.config.gc_immix_debug) {
std::cerr << "[GC IMMIX: " << clear_marked_objects() << " marked"
<< ", "
<< via_roots << " roots "
<< via_handles_ << " handles "
<< (int)(percentage_live * 100) << "% live"
<< ", " << live_bytes << "/" << total_bytes
<< "]\n";
}
if(percentage_live >= 0.90) {
if(object_memory_->state->shared.config.gc_immix_debug) {
std::cerr << "[GC IMMIX: expanding. "
<< (int)(percentage_live * 100)
<< "%]\n";
}
gc_.block_allocator().add_chunk();
}
#ifdef IMMIX_DEBUG
std::cout << "Immix: RS size cleared: " << cleared << "\n";
immix::Chunks& chunks = gc_.block_allocator().chunks();
std::cout << "chunks=" << chunks.size() << "\n";
immix::AllBlockIterator iter(chunks);
int blocks_seen = 0;
int total_objects = 0;
int total_object_bytes = 0;
while(immix::Block* block = iter.next()) {
blocks_seen++;
std::cout << "block " << block << ", holes=" << block->holes() << " "
<< "objects=" << block->objects() << " "
<< "object_bytes=" << block->object_bytes() << " "
<< "frag=" << block->fragmentation_ratio()
<< "\n";
total_objects += block->objects();
total_object_bytes += block->object_bytes();
}
std::cout << blocks_seen << " blocks\n";
std::cout << gc_.bytes_allocated() << " bytes allocated\n";
std::cout << total_object_bytes << " object bytes / " << total_objects << " objects\n";
int* holes = new int[10];
for(int i = 0; i < 10; i++) {
holes[i] = 0;
}
immix::AllBlockIterator iter2(chunks);
while(immix::Block* block = iter2.next()) {
int h = block->holes();
if(h > 9) h = 9;
holes[h]++;
}
std::cout << "== hole stats ==\n";
for(int i = 0; i < 10; i++) {
if(holes[i] > 0) {
std::cout << i << ": " << holes[i] << "\n";
}
}
#endif
}
/* Perform garbage collection on the young objects. */
void BakerGC::collect(GCData& data) {
#ifdef RBX_GC_STATS
stats::GCStats::get()->bytes_copied.start();
stats::GCStats::get()->objects_copied.start();
stats::GCStats::get()->objects_promoted.start();
stats::GCStats::get()->collect_young.start();
#endif
Object* tmp;
ObjectArray *current_rs = object_memory->remember_set;
object_memory->remember_set = new ObjectArray(0);
total_objects = 0;
// Tracks all objects that we promoted during this run, so
// we can scan them at the end.
promoted_ = new ObjectArray(0);
promoted_current = promoted_insert = promoted_->begin();
for(ObjectArray::iterator oi = current_rs->begin();
oi != current_rs->end();
++oi) {
tmp = *oi;
// unremember_object throws a NULL in to remove an object
// so we don't have to compact the set in unremember
if(tmp) {
assert(tmp->zone == MatureObjectZone);
assert(!tmp->forwarded_p());
// Remove the Remember bit, since we're clearing the set.
tmp->clear_remember();
scan_object(tmp);
}
}
delete current_rs;
for(Roots::Iterator i(data.roots()); i.more(); i.advance()) {
tmp = i->get();
if(tmp->reference_p() && tmp->young_object_p()) {
i->set(saw_object(tmp));
}
}
for(VariableRootBuffers::Iterator i(data.variable_buffers());
i.more(); i.advance()) {
Object*** buffer = i->buffer();
for(int idx = 0; idx < i->size(); idx++) {
Object** var = buffer[idx];
Object* tmp = *var;
if(tmp->reference_p() && tmp->young_object_p()) {
*var = saw_object(tmp);
}
}
}
// Walk all the call frames
for(CallFrameLocationList::iterator i = data.call_frames().begin();
i != data.call_frames().end();
i++) {
CallFrame** loc = *i;
walk_call_frame(*loc);
}
/* Ok, now handle all promoted objects. This is setup a little weird
* so I should explain.
*
* We want to scan each promoted object. But this scanning will likely
* cause more objects to be promoted. Adding to an ObjectArray that your
* iterating over blows up the iterators, so instead we rotate the
* current promoted set out as we iterator over it, and stick an
* empty ObjectArray in.
*
* This way, when there are no more objects that are promoted, the last
* ObjectArray will be empty.
* */
promoted_current = promoted_insert = promoted_->begin();
while(promoted_->size() > 0 || !fully_scanned_p()) {
if(promoted_->size() > 0) {
for(;promoted_current != promoted_->end();
++promoted_current) {
tmp = *promoted_current;
assert(tmp->zone == MatureObjectZone);
scan_object(tmp);
if(watched_p(tmp)) {
std::cout << "detected " << tmp << " during scan of promoted objects.\n";
}
}
promoted_->resize(promoted_insert - promoted_->begin());
promoted_current = promoted_insert = promoted_->begin();
}
/* As we're handling promoted objects, also handle unscanned objects.
* Scanning these unscanned objects (via the scan pointer) will
* cause more promotions. */
copy_unscanned();
}
assert(promoted_->size() == 0);
delete promoted_;
promoted_ = NULL;
assert(fully_scanned_p());
/* Another than is going to be found is found now, so we go back and
* look at everything in current and call delete_object() on anything
* thats not been forwarded. */
find_lost_souls();
/* Check any weakrefs and replace dead objects with nil*/
clean_weakrefs(true);
/* Swap the 2 halves */
Heap *x = next;
next = current;
current = x;
next->reset();
#ifdef RBX_GC_STATS
stats::GCStats::get()->collect_young.stop();
stats::GCStats::get()->objects_copied.stop();
stats::GCStats::get()->objects_promoted.stop();
stats::GCStats::get()->bytes_copied.stop();
#endif
}
void ObjectWalker::seed(GCData& data) {
Object* tmp;
ObjectArray *current_rs = object_memory_->remember_set();
for(ObjectArray::iterator oi = current_rs->begin();
oi != current_rs->end();
++oi) {
tmp = *oi;
// unremember_object throws a NULL in to remove an object
// so we don't have to compact the set in unremember
if(tmp) saw_object(tmp);
}
for(std::list<gc::WriteBarrier*>::iterator wbi = object_memory_->aux_barriers().begin();
wbi != object_memory_->aux_barriers().end();
++wbi) {
gc::WriteBarrier* wb = *wbi;
ObjectArray* rs = wb->remember_set();
for(ObjectArray::iterator oi = rs->begin();
oi != rs->end();
++oi) {
tmp = *oi;
if(tmp) saw_object(tmp);
}
}
for(Roots::Iterator i(data.roots()); i.more(); i.advance()) {
saw_object(i->get());
}
if(data.threads()) {
for(std::list<ManagedThread*>::iterator i = data.threads()->begin();
i != data.threads()->end();
++i) {
for(Roots::Iterator ri((*i)->roots()); ri.more(); ri.advance()) {
saw_object(ri->get());
}
}
}
for(capi::Handles::Iterator i(*data.handles()); i.more(); i.advance()) {
saw_object(i->object());
}
for(capi::Handles::Iterator i(*data.cached_handles()); i.more(); i.advance()) {
saw_object(i->object());
}
for(VariableRootBuffers::Iterator i(data.variable_buffers());
i.more(); i.advance()) {
Object*** buffer = i->buffer();
for(int idx = 0; idx < i->size(); idx++) {
Object** var = buffer[idx];
Object* tmp = *var;
saw_object(tmp);
}
}
RootBuffers* rb = data.root_buffers();
if(rb) {
for(RootBuffers::Iterator i(*rb);
i.more();
i.advance())
{
Object** buffer = i->buffer();
for(int idx = 0; idx < i->size(); idx++) {
saw_object(buffer[idx]);
}
}
}
// Walk all the call frames
for(CallFrameLocationList::iterator i = data.call_frames().begin();
i != data.call_frames().end();
++i) {
CallFrame** loc = *i;
walk_call_frame(*loc);
}
}