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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.
*/
#ifndef ART_RUNTIME_GC_ROOT_H_
#define ART_RUNTIME_GC_ROOT_H_
#include "base/macros.h"
#include "base/mutex.h" // For Locks::mutator_lock_.
#include "object_callbacks.h"
namespace art {
template<class MirrorType>
class PACKED(4) GcRoot {
public:
template<ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
ALWAYS_INLINE MirrorType* Read() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void VisitRoot(RootCallback* callback, void* arg, uint32_t thread_id, RootType root_type) {
callback(reinterpret_cast<mirror::Object**>(&root_), arg, thread_id, root_type);
}
// This is only used by IrtIterator.
ALWAYS_INLINE MirrorType** AddressWithoutBarrier() {
return &root_;
}
bool IsNull() const {
// It's safe to null-check it without a read barrier.
return root_ == nullptr;
}
ALWAYS_INLINE explicit GcRoot<MirrorType>() : root_(nullptr) {
}
ALWAYS_INLINE explicit GcRoot<MirrorType>(MirrorType* ref)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : root_(ref) {
}
private:
MirrorType* root_;
};
} // namespace art
#endif // ART_RUNTIME_GC_ROOT_H_
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