object_type ClassifyObjectClosure::classify_object(oop obj, bool count) {
object_type type = unknown_type;
Klass* k = obj->blueprint();
if (k->as_klassOop() == SystemDictionary::Object_klass()) {
tty->print_cr("Found the class!");
}
if (count) {
k->set_alloc_count(k->alloc_count() + 1);
}
if (obj->is_instance()) {
if (k->oop_is_instanceRef()) {
type = instanceRef_type;
} else {
type = instance_type;
}
} else if (obj->is_typeArray()) {
type = typeArray_type;
} else if (obj->is_objArray()) {
type = objArray_type;
} else if (obj->is_symbol()) {
type = symbol_type;
} else if (obj->is_klass()) {
Klass* k = ((klassOop)obj)->klass_part();
if (k->oop_is_instance()) {
type = instanceKlass_type;
} else {
type = klass_type;
}
} else if (obj->is_method()) {
type = method_type;
} else if (obj->is_constMethod()) {
type = constMethod_type;
} else if (obj->is_methodData()) {
ShouldNotReachHere();
} else if (obj->is_constantPool()) {
type = constantPool_type;
} else if (obj->is_constantPoolCache()) {
type = constantPoolCache_type;
} else if (obj->is_compiledICHolder()) {
type = compiledICHolder_type;
} else {
ShouldNotReachHere();
}
assert(type != unknown_type, "found object of unknown type.");
return type;
}
// Return true if oop represents an object that is "visible"
// to the java world.
static inline bool visible_oop(oop o) {
// the sentinel for deleted handles isn't visible
if (o == JNIHandles::deleted_handle()) {
return false;
}
// instance
if (o->is_instance()) {
// instance objects are visible
if (o->klass() != SystemDictionary::Class_klass()) {
return true;
}
if (java_lang_Class::is_primitive(o)) {
return true;
}
// java.lang.Classes are visible
Klass* k = java_lang_Class::as_Klass(o);
if (k->is_klass()) {
// if it's a class for an object, an object array, or
// primitive (type) array then it's visible.
if (k->is_instance_klass()) {
return true;
}
if (k->is_objArray_klass()) {
return true;
}
if (k->is_typeArray_klass()) {
return true;
}
}
return false;
}
// object arrays are visible if they aren't system object arrays
if (o->is_objArray()) {
return true;
}
// type arrays are visible
if (o->is_typeArray()) {
return true;
}
// everything else (Method*s, ...) aren't visible
return false;
}; // end of visible_oop()
template <class T> void do_oop_work(T* p) {
assert(_containing_obj != NULL, "Precondition");
assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking),
"Precondition");
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
bool failed = false;
if (!_g1h->is_in_closed_subset(obj) ||
_g1h->is_obj_dead_cond(obj, _use_prev_marking)) {
if (!_failures) {
gclog_or_tty->print_cr("");
gclog_or_tty->print_cr("----------");
}
if (!_g1h->is_in_closed_subset(obj)) {
HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
gclog_or_tty->print_cr("Field "PTR_FORMAT
" of live obj "PTR_FORMAT" in region "
"["PTR_FORMAT", "PTR_FORMAT")",
p, (void*) _containing_obj,
from->bottom(), from->end());
print_object(gclog_or_tty, _containing_obj);
gclog_or_tty->print_cr("points to obj "PTR_FORMAT" not in the heap",
(void*) obj);
} else {
HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
HeapRegion* to = _g1h->heap_region_containing((HeapWord*)obj);
gclog_or_tty->print_cr("Field "PTR_FORMAT
" of live obj "PTR_FORMAT" in region "
"["PTR_FORMAT", "PTR_FORMAT")",
p, (void*) _containing_obj,
from->bottom(), from->end());
print_object(gclog_or_tty, _containing_obj);
gclog_or_tty->print_cr("points to dead obj "PTR_FORMAT" in region "
"["PTR_FORMAT", "PTR_FORMAT")",
(void*) obj, to->bottom(), to->end());
print_object(gclog_or_tty, obj);
}
gclog_or_tty->print_cr("----------");
_failures = true;
failed = true;
_n_failures++;
}
if (!_g1h->full_collection()) {
HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
HeapRegion* to = _g1h->heap_region_containing(obj);
if (from != NULL && to != NULL &&
from != to &&
!to->isHumongous()) {
jbyte cv_obj = *_bs->byte_for_const(_containing_obj);
jbyte cv_field = *_bs->byte_for_const(p);
const jbyte dirty = CardTableModRefBS::dirty_card_val();
bool is_bad = !(from->is_young()
|| to->rem_set()->contains_reference(p)
|| !G1HRRSFlushLogBuffersOnVerify && // buffers were not flushed
(_containing_obj->is_objArray() ?
cv_field == dirty
: cv_obj == dirty || cv_field == dirty));
if (is_bad) {
if (!_failures) {
gclog_or_tty->print_cr("");
gclog_or_tty->print_cr("----------");
}
gclog_or_tty->print_cr("Missing rem set entry:");
gclog_or_tty->print_cr("Field "PTR_FORMAT
" of obj "PTR_FORMAT
", in region %d ["PTR_FORMAT
", "PTR_FORMAT"),",
p, (void*) _containing_obj,
from->hrs_index(),
from->bottom(),
from->end());
_containing_obj->print_on(gclog_or_tty);
gclog_or_tty->print_cr("points to obj "PTR_FORMAT
" in region %d ["PTR_FORMAT
", "PTR_FORMAT").",
(void*) obj, to->hrs_index(),
to->bottom(), to->end());
obj->print_on(gclog_or_tty);
gclog_or_tty->print_cr("Obj head CTE = %d, field CTE = %d.",
cv_obj, cv_field);
gclog_or_tty->print_cr("----------");
_failures = true;
if (!failed) _n_failures++;
}
}
}
}
}
oop G1ParScanThreadState::copy_to_survivor_space(InCSetState const state,
oop const old,
markOop const old_mark) {
const size_t word_sz = old->size();
HeapRegion* const from_region = _g1h->heap_region_containing_raw(old);
// +1 to make the -1 indexes valid...
const int young_index = from_region->young_index_in_cset()+1;
assert( (from_region->is_young() && young_index > 0) ||
(!from_region->is_young() && young_index == 0), "invariant" );
const AllocationContext_t context = from_region->allocation_context();
uint age = 0;
InCSetState dest_state = next_state(state, old_mark, age);
HeapWord* obj_ptr = _plab_allocator->plab_allocate(dest_state, word_sz, context);
// PLAB allocations should succeed most of the time, so we'll
// normally check against NULL once and that's it.
if (obj_ptr == NULL) {
obj_ptr = _plab_allocator->allocate_direct_or_new_plab(dest_state, word_sz, context);
if (obj_ptr == NULL) {
obj_ptr = allocate_in_next_plab(state, &dest_state, word_sz, context);
if (obj_ptr == NULL) {
// This will either forward-to-self, or detect that someone else has
// installed a forwarding pointer.
return handle_evacuation_failure_par(old, old_mark);
}
}
}
assert(obj_ptr != NULL, "when we get here, allocation should have succeeded");
assert(_g1h->is_in_reserved(obj_ptr), "Allocated memory should be in the heap");
#ifndef PRODUCT
// Should this evacuation fail?
if (_g1h->evacuation_should_fail()) {
// Doing this after all the allocation attempts also tests the
// undo_allocation() method too.
_plab_allocator->undo_allocation(dest_state, obj_ptr, word_sz, context);
return handle_evacuation_failure_par(old, old_mark);
}
#endif // !PRODUCT
// We're going to allocate linearly, so might as well prefetch ahead.
Prefetch::write(obj_ptr, PrefetchCopyIntervalInBytes);
const oop obj = oop(obj_ptr);
const oop forward_ptr = old->forward_to_atomic(obj);
if (forward_ptr == NULL) {
Copy::aligned_disjoint_words((HeapWord*) old, obj_ptr, word_sz);
if (dest_state.is_young()) {
if (age < markOopDesc::max_age) {
age++;
}
if (old_mark->has_displaced_mark_helper()) {
// In this case, we have to install the mark word first,
// otherwise obj looks to be forwarded (the old mark word,
// which contains the forward pointer, was copied)
obj->set_mark(old_mark);
markOop new_mark = old_mark->displaced_mark_helper()->set_age(age);
old_mark->set_displaced_mark_helper(new_mark);
} else {
obj->set_mark(old_mark->set_age(age));
}
age_table()->add(age, word_sz);
} else {
obj->set_mark(old_mark);
}
if (G1StringDedup::is_enabled()) {
const bool is_from_young = state.is_young();
const bool is_to_young = dest_state.is_young();
assert(is_from_young == _g1h->heap_region_containing_raw(old)->is_young(),
"sanity");
assert(is_to_young == _g1h->heap_region_containing_raw(obj)->is_young(),
"sanity");
G1StringDedup::enqueue_from_evacuation(is_from_young,
is_to_young,
_worker_id,
obj);
}
size_t* const surv_young_words = surviving_young_words();
surv_young_words[young_index] += word_sz;
if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) {
// We keep track of the next start index in the length field of
// the to-space object. The actual length can be found in the
// length field of the from-space object.
arrayOop(obj)->set_length(0);
oop* old_p = set_partial_array_mask(old);
push_on_queue(old_p);
} else {
HeapRegion* const to_region = _g1h->heap_region_containing_raw(obj_ptr);
_scanner.set_region(to_region);
obj->oop_iterate_backwards(&_scanner);
}
return obj;
} else {
_plab_allocator->undo_allocation(dest_state, obj_ptr, word_sz, context);
return forward_ptr;
}
}
inline bool G1CMObjArrayProcessor::should_be_sliced(oop obj) {
return obj->is_objArray() && ((size_t)((objArrayOop)obj)->size()) >= 2 * ObjArrayMarkingStride;
}
size_t G1CMObjArrayProcessor::process_obj(oop obj) {
assert(should_be_sliced(obj), "Must be an array object %d and large " SIZE_FORMAT, obj->is_objArray(), (size_t)obj->size());
return process_array_slice(objArrayOop(obj), (HeapWord*)obj, (size_t)objArrayOop(obj)->size());
}