143 lines
4.5 KiB
C++
143 lines
4.5 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "space.h"
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#include <android-base/logging.h>
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#include "base/macros.h"
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#include "gc/accounting/heap_bitmap.h"
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#include "gc/accounting/space_bitmap-inl.h"
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#include "gc/heap.h"
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#include "runtime.h"
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#include "thread-current-inl.h"
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namespace art {
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namespace gc {
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namespace space {
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Space::Space(const std::string& name, GcRetentionPolicy gc_retention_policy)
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: name_(name), gc_retention_policy_(gc_retention_policy) { }
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void Space::Dump(std::ostream& os) const {
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os << GetName() << ":" << GetGcRetentionPolicy();
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}
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std::ostream& operator<<(std::ostream& os, const Space& space) {
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space.Dump(os);
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return os;
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}
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DlMallocSpace* Space::AsDlMallocSpace() {
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UNIMPLEMENTED(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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RosAllocSpace* Space::AsRosAllocSpace() {
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UNIMPLEMENTED(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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ZygoteSpace* Space::AsZygoteSpace() {
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UNIMPLEMENTED(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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BumpPointerSpace* Space::AsBumpPointerSpace() {
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UNIMPLEMENTED(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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RegionSpace* Space::AsRegionSpace() {
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LOG(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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AllocSpace* Space::AsAllocSpace() {
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UNIMPLEMENTED(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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ContinuousMemMapAllocSpace* Space::AsContinuousMemMapAllocSpace() {
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UNIMPLEMENTED(FATAL) << "Unreachable";
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UNREACHABLE();
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}
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DiscontinuousSpace::DiscontinuousSpace(const std::string& name,
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GcRetentionPolicy gc_retention_policy) :
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Space(name, gc_retention_policy) {
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// TODO: Fix this if we ever support objects not in the low 32 bit.
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const size_t capacity = static_cast<size_t>(std::numeric_limits<uint32_t>::max());
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live_bitmap_ = accounting::LargeObjectBitmap::Create("large live objects", nullptr, capacity);
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CHECK(live_bitmap_.IsValid());
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mark_bitmap_ = accounting::LargeObjectBitmap::Create("large marked objects", nullptr, capacity);
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CHECK(mark_bitmap_.IsValid());
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}
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collector::ObjectBytePair ContinuousMemMapAllocSpace::Sweep(bool swap_bitmaps) {
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accounting::ContinuousSpaceBitmap* live_bitmap = GetLiveBitmap();
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accounting::ContinuousSpaceBitmap* mark_bitmap = GetMarkBitmap();
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// If the bitmaps are bound then sweeping this space clearly won't do anything.
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if (live_bitmap == mark_bitmap) {
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return collector::ObjectBytePair(0, 0);
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}
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SweepCallbackContext scc(swap_bitmaps, this);
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if (swap_bitmaps) {
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std::swap(live_bitmap, mark_bitmap);
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}
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// Bitmaps are pre-swapped for optimization which enables sweeping with the heap unlocked.
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accounting::ContinuousSpaceBitmap::SweepWalk(
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*live_bitmap, *mark_bitmap, reinterpret_cast<uintptr_t>(Begin()),
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reinterpret_cast<uintptr_t>(End()), GetSweepCallback(), reinterpret_cast<void*>(&scc));
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return scc.freed;
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}
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void ContinuousMemMapAllocSpace::BindLiveToMarkBitmap() {
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CHECK(!HasBoundBitmaps());
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temp_bitmap_ = std::move(mark_bitmap_);
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mark_bitmap_.CopyView(live_bitmap_);
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}
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bool ContinuousSpace::HasBoundBitmaps() {
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DCHECK(GetLiveBitmap() != nullptr);
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DCHECK(GetMarkBitmap() != nullptr);
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// Check if the bitmaps are pointing to the same underlying data.
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return GetLiveBitmap()->Begin() == GetMarkBitmap()->Begin();
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}
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void ContinuousMemMapAllocSpace::UnBindBitmaps() {
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CHECK(HasBoundBitmaps());
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// At this point, `temp_bitmap_` holds our old mark bitmap.
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mark_bitmap_ = std::move(temp_bitmap_);
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}
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void ContinuousMemMapAllocSpace::SwapBitmaps() {
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CHECK(!HasBoundBitmaps());
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std::swap(live_bitmap_, mark_bitmap_);
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// Preserve names to get more descriptive diagnostics.
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std::string temp_name(live_bitmap_.GetName());
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live_bitmap_.SetName(mark_bitmap_.GetName());
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mark_bitmap_.SetName(temp_name);
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}
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AllocSpace::SweepCallbackContext::SweepCallbackContext(bool swap_bitmaps_in, space::Space* space_in)
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: swap_bitmaps(swap_bitmaps_in), space(space_in), self(Thread::Current()) {
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}
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} // namespace space
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} // namespace gc
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} // namespace art
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