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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "remembered_set.h"
#include "base/stl_util.h"
#include "card_table-inl.h"
#include "heap_bitmap.h"
#include "gc/collector/mark_sweep.h"
#include "gc/collector/mark_sweep-inl.h"
#include "gc/collector/semi_space.h"
#include "gc/heap.h"
#include "gc/space/space.h"
#include "mirror/art_field-inl.h"
#include "mirror/object-inl.h"
#include "mirror/class-inl.h"
#include "mirror/object_array-inl.h"
#include "space_bitmap-inl.h"
#include "thread.h"
#include "UniquePtr.h"
namespace art {
namespace gc {
namespace accounting {
class RememberedSetCardVisitor {
public:
explicit RememberedSetCardVisitor(RememberedSet::CardSet* const dirty_cards)
: dirty_cards_(dirty_cards) {}
void operator()(byte* card, byte expected_value, byte new_value) const {
if (expected_value == CardTable::kCardDirty) {
dirty_cards_->insert(card);
}
}
private:
RememberedSet::CardSet* const dirty_cards_;
};
void RememberedSet::ClearCards() {
CardTable* card_table = GetHeap()->GetCardTable();
RememberedSetCardVisitor card_visitor(&dirty_cards_);
// Clear dirty cards in the space and insert them into the dirty card set.
card_table->ModifyCardsAtomic(space_->Begin(), space_->End(), AgeCardVisitor(), card_visitor);
}
class RememberedSetReferenceVisitor {
public:
RememberedSetReferenceVisitor(MarkHeapReferenceCallback* callback,
DelayReferenceReferentCallback* ref_callback,
space::ContinuousSpace* target_space,
bool* const contains_reference_to_target_space, void* arg)
: callback_(callback), ref_callback_(ref_callback), target_space_(target_space), arg_(arg),
contains_reference_to_target_space_(contains_reference_to_target_space) {}
void operator()(mirror::Object* obj, MemberOffset offset, bool /* is_static */) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(obj != nullptr);
mirror::HeapReference<mirror::Object>* ref_ptr = obj->GetFieldObjectReferenceAddr(offset);
if (target_space_->HasAddress(ref_ptr->AsMirrorPtr())) {
*contains_reference_to_target_space_ = true;
callback_(ref_ptr, arg_);
DCHECK(!target_space_->HasAddress(ref_ptr->AsMirrorPtr()));
}
}
void operator()(mirror::Class* klass, mirror::Reference* ref) const
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) {
if (target_space_->HasAddress(ref->GetReferent())) {
*contains_reference_to_target_space_ = true;
ref_callback_(klass, ref, arg_);
}
}
private:
MarkHeapReferenceCallback* const callback_;
DelayReferenceReferentCallback* const ref_callback_;
space::ContinuousSpace* const target_space_;
void* const arg_;
bool* const contains_reference_to_target_space_;
};
class RememberedSetObjectVisitor {
public:
RememberedSetObjectVisitor(MarkHeapReferenceCallback* callback,
DelayReferenceReferentCallback* ref_callback,
space::ContinuousSpace* target_space,
bool* const contains_reference_to_target_space, void* arg)
: callback_(callback), ref_callback_(ref_callback), target_space_(target_space), arg_(arg),
contains_reference_to_target_space_(contains_reference_to_target_space) {}
void operator()(mirror::Object* obj) const EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
RememberedSetReferenceVisitor visitor(callback_, ref_callback_, target_space_,
contains_reference_to_target_space_, arg_);
obj->VisitReferences<kMovingClasses>(visitor, visitor);
}
private:
MarkHeapReferenceCallback* const callback_;
DelayReferenceReferentCallback* const ref_callback_;
space::ContinuousSpace* const target_space_;
void* const arg_;
bool* const contains_reference_to_target_space_;
};
void RememberedSet::UpdateAndMarkReferences(MarkHeapReferenceCallback* callback,
DelayReferenceReferentCallback* ref_callback,
space::ContinuousSpace* target_space, void* arg) {
CardTable* card_table = heap_->GetCardTable();
bool contains_reference_to_target_space = false;
RememberedSetObjectVisitor obj_visitor(callback, ref_callback, target_space,
&contains_reference_to_target_space, arg);
ContinuousSpaceBitmap* bitmap = space_->GetLiveBitmap();
CardSet remove_card_set;
for (byte* const card_addr : dirty_cards_) {
contains_reference_to_target_space = false;
uintptr_t start = reinterpret_cast<uintptr_t>(card_table->AddrFromCard(card_addr));
DCHECK(space_->HasAddress(reinterpret_cast<mirror::Object*>(start)));
bitmap->VisitMarkedRange(start, start + CardTable::kCardSize, obj_visitor);
if (!contains_reference_to_target_space) {
// It was in the dirty card set, but it didn't actually contain
// a reference to the target space. So, remove it from the dirty
// card set so we won't have to scan it again (unless it gets
// dirty again.)
remove_card_set.insert(card_addr);
}
}
// Remove the cards that didn't contain a reference to the target
// space from the dirty card set.
for (byte* const card_addr : remove_card_set) {
DCHECK(dirty_cards_.find(card_addr) != dirty_cards_.end());
dirty_cards_.erase(card_addr);
}
}
void RememberedSet::Dump(std::ostream& os) {
CardTable* card_table = heap_->GetCardTable();
os << "RememberedSet dirty cards: [";
for (const byte* card_addr : dirty_cards_) {
auto start = reinterpret_cast<uintptr_t>(card_table->AddrFromCard(card_addr));
auto end = start + CardTable::kCardSize;
os << reinterpret_cast<void*>(start) << "-" << reinterpret_cast<void*>(end) << "\n";
}
os << "]";
}
void RememberedSet::AssertAllDirtyCardsAreWithinSpace() const {
CardTable* card_table = heap_->GetCardTable();
for (const byte* card_addr : dirty_cards_) {
auto start = reinterpret_cast<byte*>(card_table->AddrFromCard(card_addr));
auto end = start + CardTable::kCardSize;
DCHECK_LE(space_->Begin(), start);
DCHECK_LE(end, space_->Limit());
}
}
} // namespace accounting
} // namespace gc
} // namespace art
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