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/*
* Copyright (C) 2015 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_COLLECTOR_IMMUNE_SPACES_H_
#define ART_RUNTIME_GC_COLLECTOR_IMMUNE_SPACES_H_
#include "base/locks.h"
#include "base/macros.h"
#include "gc/space/space.h"
#include "immune_region.h"
#include <set>
namespace art {
namespace gc {
namespace space {
class ContinuousSpace;
} // namespace space
namespace collector {
// ImmuneSpaces is a set of spaces which are not going to have any objects become marked during the
// GC.
class ImmuneSpaces {
class CompareByBegin {
public:
bool operator()(space::ContinuousSpace* a, space::ContinuousSpace* b) const;
};
public:
ImmuneSpaces() {}
void Reset();
// Add a continuous space to the immune spaces set.
void AddSpace(space::ContinuousSpace* space) REQUIRES(Locks::heap_bitmap_lock_);
// Returns true if an object is inside of the immune region (assumed to be marked). Only returns
// true for the largest immune region. The object can still be inside of an immune space.
ALWAYS_INLINE bool IsInImmuneRegion(const mirror::Object* obj) const {
return largest_immune_region_.ContainsObject(obj);
}
// Return true if the spaces is contained.
bool ContainsSpace(space::ContinuousSpace* space) const;
// Return the set of spaces in the immune region.
const std::set<space::ContinuousSpace*, CompareByBegin>& GetSpaces() {
return spaces_;
}
// Return the associated largest immune region.
const ImmuneRegion& GetLargestImmuneRegion() const {
return largest_immune_region_;
}
// Return true if the object is contained by any of the immune space.s
ALWAYS_INLINE bool ContainsObject(const mirror::Object* obj) const {
if (largest_immune_region_.ContainsObject(obj)) {
return true;
}
for (space::ContinuousSpace* space : spaces_) {
if (space->HasAddress(obj)) {
return true;
}
}
return false;
}
private:
// Setup the immune region to the largest continuous set of immune spaces. The immune region is
// just the for the fast path lookup.
void CreateLargestImmuneRegion();
std::set<space::ContinuousSpace*, CompareByBegin> spaces_;
ImmuneRegion largest_immune_region_;
};
} // namespace collector
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_COLLECTOR_IMMUNE_SPACES_H_
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