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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "gc/heap.h"
     18 #include "gc/space/large_object_space.h"
     19 #include "gc/space/space.h"
     20 #include "sticky_mark_sweep.h"
     21 #include "thread.h"
     22 
     23 namespace art {
     24 namespace gc {
     25 namespace collector {
     26 
     27 StickyMarkSweep::StickyMarkSweep(Heap* heap, bool is_concurrent, const std::string& name_prefix)
     28     : PartialMarkSweep(heap, is_concurrent,
     29                        name_prefix + (name_prefix.empty() ? "" : " ") + "sticky") {
     30   cumulative_timings_.SetName(GetName());
     31 }
     32 
     33 void StickyMarkSweep::BindBitmaps() {
     34   PartialMarkSweep::BindBitmaps();
     35 
     36   WriterMutexLock mu(Thread::Current(), *Locks::heap_bitmap_lock_);
     37   // For sticky GC, we want to bind the bitmaps of all spaces as the allocation stack lets us
     38   // know what was allocated since the last GC. A side-effect of binding the allocation space mark
     39   // and live bitmap is that marking the objects will place them in the live bitmap.
     40   for (const auto& space : GetHeap()->GetContinuousSpaces()) {
     41     if (space->GetGcRetentionPolicy() == space::kGcRetentionPolicyAlwaysCollect) {
     42       BindLiveToMarkBitmap(space);
     43     }
     44   }
     45 
     46   GetHeap()->GetLargeObjectsSpace()->CopyLiveToMarked();
     47 }
     48 
     49 void StickyMarkSweep::MarkReachableObjects() {
     50   // All reachable objects must be referenced by a root or a dirty card, so we can clear the mark
     51   // stack here since all objects in the mark stack will get scanned by the card scanning anyways.
     52   // TODO: Not put these objects in the mark stack in the first place.
     53   mark_stack_->Reset();
     54   RecursiveMarkDirtyObjects(false, accounting::CardTable::kCardDirty - 1);
     55 }
     56 
     57 void StickyMarkSweep::Sweep(bool swap_bitmaps) {
     58   accounting::ObjectStack* live_stack = GetHeap()->GetLiveStack();
     59   SweepArray(live_stack, false);
     60 }
     61 
     62 void StickyMarkSweep::MarkThreadRoots(Thread* self) {
     63   MarkRootsCheckpoint(self);
     64 }
     65 
     66 
     67 }  // namespace collector
     68 }  // namespace gc
     69 }  // namespace art
     70