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objectmemory.cpp
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objectmemory.cpp
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#include <cstdlib>
#include <iostream>
#include "vm.hpp"
#include "objectmemory.hpp"
#include "gc/marksweep.hpp"
#include "gc/baker.hpp"
#include "gc/immix.hpp"
#include "gc/inflated_headers.hpp"
#include "config_parser.hpp"
#include "builtin/class.hpp"
#include "builtin/fixnum.hpp"
#include "builtin/tuple.hpp"
#include "capi/handle.hpp"
#include "configuration.hpp"
#include "global_cache.hpp"
namespace rubinius {
Object* object_watch = 0;
/* ObjectMemory methods */
ObjectMemory::ObjectMemory(STATE, Configuration& config)
: young_(new BakerGC(this, config.gc_bytes))
, mark_sweep_(new MarkSweepGC(this))
, immix_(new ImmixGC(this))
, inflated_headers_(new InflatedHeaders)
, state(state)
{
// TODO Not sure where this code should be...
if(char* num = getenv("RBX_WATCH")) {
object_watch = (Object*)strtol(num, NULL, 10);
std::cout << "Watching for " << object_watch << "\n";
}
remember_set_ = new ObjectArray(0);
collect_mature_now = false;
last_object_id = 0;
large_object_threshold = config.gc_large_object;
young_->set_lifetime(config.gc_lifetime);
if(config.gc_autotune) young_->set_autotune();
for(size_t i = 0; i < LastObjectType; i++) {
type_info[i] = NULL;
}
TypeInfo::init(this);
}
ObjectMemory::~ObjectMemory() {
mark_sweep_->free_objects();
// TODO free immix data
delete remember_set_;
for(size_t i = 0; i < LastObjectType; i++) {
if(type_info[i]) delete type_info[i];
}
delete immix_;
delete mark_sweep_;
delete young_;
}
ObjectArray* ObjectMemory::swap_remember_set() {
ObjectArray* cur = remember_set_;
remember_set_ = new ObjectArray(0);
return cur;
}
Object* ObjectMemory::new_object_fast(Class* cls, size_t bytes, object_type type) {
if(Object* obj = young_->raw_allocate(bytes, &collect_young_now)) {
if(collect_young_now) state->interrupts.set_perform_gc();
obj->init_header(cls, YoungObjectZone, type);
obj->clear_fields(bytes);
return obj;
} else {
return new_object_typed(cls, bytes, type);
}
}
void ObjectMemory::set_young_lifetime(size_t age) {
young_->set_lifetime(age);
}
void ObjectMemory::debug_marksweep(bool val) {
if(val) {
mark_sweep_->free_entries = false;
} else {
mark_sweep_->free_entries = true;
}
}
bool ObjectMemory::valid_object_p(Object* obj) {
if(obj->young_object_p()) {
return young_->validate_object(obj) == cValid;
} else if(obj->mature_object_p()) {
return true;
} else {
return false;
}
}
/* Garbage collection */
Object* ObjectMemory::promote_object(Object* obj) {
#ifdef RBX_GC_STATS
stats::GCStats::get()->objects_promoted++;
#endif
Object* copy = immix_->allocate(obj->size_in_bytes(state));
copy->set_obj_type(obj->type_id());
copy->initialize_copy(obj, 0);
copy->copy_body(state, obj);
if(watched_p(obj)) {
std::cout << "detected object " << obj << " during promotion.\n";
}
return copy;
}
void ObjectMemory::collect_young(GCData& data, YoungCollectStats* stats) {
collect_young_now = false;
static int collect_times = 0;
// validate_handles(data.handles());
// validate_handles(data.cached_handles());
young_->collect(data, stats);
prune_handles(data.handles(), true);
prune_handles(data.cached_handles(), true);
collect_times++;
data.global_cache()->prune_young();
}
void ObjectMemory::collect_mature(GCData& data) {
#ifdef RBX_GC_STATS
stats::GCStats::get()->objects_seen.start();
stats::GCStats::get()->collect_mature.start();
#endif
// validate_handles(data.handles());
// validate_handles(data.cached_handles());
collect_mature_now = false;
immix_->collect(data);
data.global_cache()->prune_unmarked();
immix_->clean_weakrefs();
prune_handles(data.handles(), false);
prune_handles(data.cached_handles(), false);
// Have to do this after all things that check for mark bits is
// done, as it free()s objects, invalidating mark bits.
mark_sweep_->after_marked();
inflated_headers_->deallocate_headers();
immix_->unmark_all(data);
#ifdef RBX_GC_STATS
stats::GCStats::get()->collect_mature.stop();
stats::GCStats::get()->objects_seen.stop();
#endif
}
InflatedHeader* ObjectMemory::inflate_header(ObjectHeader* obj) {
if(obj->inflated_header_p()) return obj->inflated_header();
InflatedHeader* header = inflated_headers_->allocate(obj);
obj->set_inflated_header(header);
return header;
}
void ObjectMemory::validate_handles(capi::Handles* handles) {
capi::Handle* handle = handles->front();
capi::Handle* current;
while(handle) {
current = handle;
handle = static_cast<capi::Handle*>(handle->next());
Object* obj = current->object();
assert(obj->inflated_header_p());
InflatedHeader* ih = obj->inflated_header();
assert(ih->handle() == current);
assert(ih->object() == obj);
}
}
void ObjectMemory::prune_handles(capi::Handles* handles, bool check_forwards) {
capi::Handle* handle = handles->front();
capi::Handle* current;
int total = 0;
int count = 0;
while(handle) {
current = handle;
handle = static_cast<capi::Handle*>(handle->next());
Object* obj = current->object();
total++;
// Strong references will already have been updated.
if(!current->weak_p()) {
if(check_forwards) assert(!obj->forwarded_p());
assert(obj->inflated_header()->object() == obj);
} else if(check_forwards) {
if(obj->young_object_p()) {
// A weakref pointing to a valid young object
//
// TODO this only works because we run prune_handles right after
// a collection. In this state, valid objects are only in current.
if(young_->in_current_p(obj)) {
continue;
// A weakref pointing to a forwarded young object
} else if(obj->forwarded_p()) {
current->set_object(obj->forward());
assert(current->object()->inflated_header_p());
assert(current->object()->inflated_header()->object() == current->object());
// A weakref pointing to a dead young object
} else {
count++;
handles->remove(current);
delete current;
}
}
// A weakref pointing to a dead mature object
} else if(!obj->marked_p()) {
count++;
handles->remove(current);
delete current;
} else {
assert(obj->inflated_header()->object() == obj);
}
}
// std::cout << "Pruned " << count << " handles, " << total << "/" << handles->size() << " total.\n";
}
int ObjectMemory::mature_bytes_allocated() {
return immix_->bytes_allocated() + mark_sweep_->allocated_bytes;
}
void ObjectMemory::add_type_info(TypeInfo* ti) {
type_info[ti->type] = ti;
}
/* Store an object into the remember set. Called when we've calculated
* externally that the object in question needs to be remembered */
void ObjectMemory::remember_object(Object* target) {
assert(target->zone() == MatureObjectZone);
/* If it's already remembered, ignore this request */
if(target->remembered_p()) return;
target->set_remember();
remember_set_->push_back(target);
}
void ObjectMemory::unremember_object(Object* target) {
for(ObjectArray::iterator oi = remember_set_->begin();
oi != remember_set_->end();
oi++) {
if(*oi == target) {
*oi = NULL;
target->clear_remember();
}
}
}
Object* ObjectMemory::allocate_object(size_t bytes) {
Object* obj;
if(unlikely(bytes > large_object_threshold)) {
obj = mark_sweep_->allocate(bytes, &collect_mature_now);
if(collect_mature_now) {
state->interrupts.set_perform_gc();
}
#ifdef RBX_GC_STATS
stats::GCStats::get()->large_objects++;
#endif
} else {
obj = young_->allocate(bytes);
if(unlikely(obj == NULL)) {
collect_young_now = true;
state->interrupts.set_perform_gc();
obj = immix_->allocate(bytes);
if(collect_mature_now) {
state->interrupts.set_perform_gc();
}
}
}
#ifdef ENABLE_OBJECT_WATCH
if(watched_p(obj)) {
std::cout << "detected " << obj << " during allocation\n";
}
#endif
obj->clear_fields(bytes);
return obj;
}
Object* ObjectMemory::allocate_object_mature(size_t bytes) {
Object* obj;
if(bytes > large_object_threshold) {
obj = mark_sweep_->allocate(bytes, &collect_mature_now);
if(collect_mature_now) {
state->interrupts.set_perform_gc();
}
#ifdef RBX_GC_STATS
stats::GCStats::get()->large_objects++;
#endif
} else {
obj = immix_->allocate(bytes);
if(collect_mature_now) {
state->interrupts.set_perform_gc();
}
}
#ifdef ENABLE_OBJECT_WATCH
if(watched_p(obj)) {
std::cout << "detected " << obj << " during mature allocation\n";
}
#endif
obj->clear_fields(bytes);
return obj;
}
Object* ObjectMemory::new_object_typed(Class* cls, size_t bytes, object_type type) {
Object* obj;
#ifdef RBX_GC_STATS
stats::GCStats::get()->young_object_types[type]++;
#endif
obj = allocate_object(bytes);
obj->klass(this, cls);
obj->set_obj_type(type);
obj->set_requires_cleanup(type_info[type]->instances_need_cleanup);
return obj;
}
Object* ObjectMemory::new_object_typed_mature(Class* cls, size_t bytes, object_type type) {
Object* obj;
#ifdef RBX_GC_STATS
stats::GCStats::get()->mature_object_types[type]++;
#endif
obj = allocate_object_mature(bytes);
obj->klass(this, cls);
obj->set_obj_type(type);
obj->set_requires_cleanup(type_info[type]->instances_need_cleanup);
return obj;
}
/* ONLY use to create Class, the first object. */
Object* ObjectMemory::allocate_object_raw(size_t bytes) {
Object* obj = mark_sweep_->allocate(bytes, &collect_mature_now);
obj->clear_fields(bytes);
return obj;
}
Object* ObjectMemory::new_object_typed_enduring(Class* cls, size_t bytes, object_type type) {
#ifdef RBX_GC_STATS
stats::GCStats::get()->mature_object_types[type]++;
#endif
Object* obj = mark_sweep_->allocate(bytes, &collect_mature_now);
if(collect_mature_now) {
state->interrupts.set_perform_gc();
}
#ifdef ENABLE_OBJECT_WATCH
if(watched_p(obj)) {
std::cout << "detected " << obj << " during enduring allocation\n";
}
#endif
obj->clear_fields(bytes);
#ifdef RBX_GC_STATS
stats::GCStats::get()->large_objects++;
#endif
obj->klass(this, cls);
obj->set_obj_type(type);
obj->set_requires_cleanup(type_info[type]->instances_need_cleanup);
return obj;
}
TypeInfo* ObjectMemory::find_type_info(Object* obj) {
return type_info[obj->type_id()];
}
ObjectPosition ObjectMemory::validate_object(Object* obj) {
ObjectPosition pos;
pos = young_->validate_object(obj);
if(pos != cUnknown) return pos;
pos = immix_->validate_object(obj);
if(pos != cUnknown) return pos;
return mark_sweep_->validate_object(obj);
}
bool ObjectMemory::valid_young_object_p(Object* obj) {
return obj->young_object_p() && young_->in_current_p(obj);
}
};
#define DEFAULT_MALLOC_THRESHOLD 10000000
static long bytes_until_collection = DEFAULT_MALLOC_THRESHOLD;
void* XMALLOC(size_t bytes) {
bytes_until_collection -= bytes;
if(bytes_until_collection <= 0) {
rubinius::VM::current_state()->run_gc_soon();
bytes_until_collection = DEFAULT_MALLOC_THRESHOLD;
}
return malloc(bytes);
}
void XFREE(void* ptr) {
free(ptr);
}
void* XREALLOC(void* ptr, size_t bytes) {
bytes_until_collection -= bytes;
if(bytes_until_collection <= 0) {
rubinius::VM::current_state()->run_gc_soon();
bytes_until_collection = DEFAULT_MALLOC_THRESHOLD;
}
return realloc(ptr, bytes);
}
void* XCALLOC(size_t items, size_t bytes_per) {
size_t bytes = bytes_per * items;
bytes_until_collection -= bytes;
if(bytes_until_collection <= 0) {
rubinius::VM::current_state()->run_gc_soon();
bytes_until_collection = DEFAULT_MALLOC_THRESHOLD;
}
return calloc(items, bytes_per);
}