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/*
* Copyright (C) 2018 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.
*/
#ifndef ART_RUNTIME_WRITE_BARRIER_H_
#define ART_RUNTIME_WRITE_BARRIER_H_
#include "base/macros.h"
namespace art {
namespace gc {
namespace accounting {
class CardTable;
} // namespace accounting
} // namespace gc
class WriteBarrier {
public:
enum NullCheck {
kWithoutNullCheck,
kWithNullCheck,
};
// Must be called if a reference field of an Object in the heap changes, and before any GC
// safe-point. The call is not needed if null is stored in the field.
template <NullCheck kNullCheck = kWithNullCheck>
ALWAYS_INLINE static void ForFieldWrite(ObjPtr<mirror::Object> dst,
MemberOffset offset ATTRIBUTE_UNUSED,
ObjPtr<mirror::Object> new_value ATTRIBUTE_UNUSED)
REQUIRES_SHARED(Locks::mutator_lock_);
// Must be called if a reference field of an ObjectArray in the heap changes, and before any GC
// safe-point. The call is not needed if null is stored in the field.
ALWAYS_INLINE static void ForArrayWrite(ObjPtr<mirror::Object> dst,
int start_offset ATTRIBUTE_UNUSED,
size_t length ATTRIBUTE_UNUSED)
REQUIRES_SHARED(Locks::mutator_lock_);
// Write barrier for every reference field in an object.
ALWAYS_INLINE static void ForEveryFieldWrite(ObjPtr<mirror::Object> obj)
REQUIRES_SHARED(Locks::mutator_lock_);
private:
ALWAYS_INLINE static gc::accounting::CardTable* GetCardTable();
};
} // namespace art
#endif // ART_RUNTIME_WRITE_BARRIER_H_
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