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/*
* Copyright (C) 2012 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_ACCOUNTING_HEAP_BITMAP_H_
#define ART_RUNTIME_GC_ACCOUNTING_HEAP_BITMAP_H_
#include "base/logging.h"
#include "gc_allocator.h"
#include "locks.h"
#include "space_bitmap.h"
namespace art {
namespace gc {
class Heap;
namespace accounting {
class HeapBitmap {
public:
typedef std::vector<SpaceBitmap*, GCAllocator<SpaceBitmap*> > SpaceBitmapVector;
typedef std::vector<SpaceSetMap*, GCAllocator<SpaceSetMap*> > SpaceSetMapVector;
bool Test(const mirror::Object* obj) SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) {
SpaceBitmap* bitmap = GetContinuousSpaceBitmap(obj);
if (LIKELY(bitmap != NULL)) {
return bitmap->Test(obj);
} else {
return GetDiscontinuousSpaceObjectSet(obj) != NULL;
}
}
void Clear(const mirror::Object* obj) EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) {
SpaceBitmap* bitmap = GetContinuousSpaceBitmap(obj);
if (LIKELY(bitmap != NULL)) {
bitmap->Clear(obj);
} else {
SpaceSetMap* set = GetDiscontinuousSpaceObjectSet(obj);
DCHECK(set != NULL);
set->Clear(obj);
}
}
void Set(const mirror::Object* obj) EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) {
SpaceBitmap* bitmap = GetContinuousSpaceBitmap(obj);
if (LIKELY(bitmap != NULL)) {
bitmap->Set(obj);
} else {
SpaceSetMap* set = GetDiscontinuousSpaceObjectSet(obj);
DCHECK(set != NULL);
set->Set(obj);
}
}
SpaceBitmap* GetContinuousSpaceBitmap(const mirror::Object* obj) {
for (const auto& bitmap : continuous_space_bitmaps_) {
if (bitmap->HasAddress(obj)) {
return bitmap;
}
}
return NULL;
}
SpaceSetMap* GetDiscontinuousSpaceObjectSet(const mirror::Object* obj) {
for (const auto& space_set : discontinuous_space_sets_) {
if (space_set->Test(obj)) {
return space_set;
}
}
return NULL;
}
void Walk(SpaceBitmap::Callback* callback, void* arg)
SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_);
template <typename Visitor>
void Visit(const Visitor& visitor)
EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Find and replace a bitmap pointer, this is used by for the bitmap swapping in the GC.
void ReplaceBitmap(SpaceBitmap* old_bitmap, SpaceBitmap* new_bitmap)
EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_);
// Find and replace a object set pointer, this is used by for the bitmap swapping in the GC.
void ReplaceObjectSet(SpaceSetMap* old_set, SpaceSetMap* new_set)
EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_);
explicit HeapBitmap(Heap* heap) : heap_(heap) {}
private:
const Heap* const heap_;
void AddContinuousSpaceBitmap(SpaceBitmap* bitmap);
void AddDiscontinuousObjectSet(SpaceSetMap* set);
// Bitmaps covering continuous spaces.
SpaceBitmapVector continuous_space_bitmaps_;
// Sets covering discontinuous spaces.
SpaceSetMapVector discontinuous_space_sets_;
friend class art::gc::Heap;
};
} // namespace accounting
} // namespace gc
} // namespace art
#endif // ART_RUNTIME_GC_ACCOUNTING_HEAP_BITMAP_H_
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