| /* |
| * Copyright (C) 2011 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_SRC_MARK_SWEEP_H_ |
| #define ART_SRC_MARK_SWEEP_H_ |
| |
| #include "macros.h" |
| #include "mark_stack.h" |
| #include "heap_bitmap.h" |
| #include "offsets.h" |
| |
| namespace art { |
| |
| class Class; |
| class Heap; |
| class Object; |
| |
| class MarkSweep { |
| public: |
| MarkSweep(MarkStack* mark_stack); |
| |
| ~MarkSweep(); |
| |
| // Initializes internal structures. |
| void Init(); |
| |
| // Marks the root set at the start of a garbage collection. |
| void MarkRoots(); |
| |
| // Marks the roots in the image space on dirty cards |
| void ScanDirtyImageRoots(); |
| |
| bool IsMarkStackEmpty() const { |
| return mark_stack_->IsEmpty(); |
| } |
| |
| // Builds a mark stack and recursively mark until it empties. |
| void RecursiveMark(); |
| |
| // Remarks the root set after completing the concurrent mark. |
| void ReMarkRoots(); |
| |
| void ProcessReferences(bool clear_soft_references) { |
| ProcessReferences(&soft_reference_list_, clear_soft_references, |
| &weak_reference_list_, |
| &finalizer_reference_list_, |
| &phantom_reference_list_); |
| } |
| |
| // Sweeps unmarked objects to complete the garbage collection. |
| void Sweep(); |
| |
| Object* GetClearedReferences() { |
| return cleared_reference_list_; |
| } |
| |
| private: |
| // Returns true if the object has its bit set in the mark bitmap. |
| bool IsMarked(const Object* object) const { |
| return mark_bitmap_->Test(object); |
| } |
| |
| static bool IsMarked(const Object* object, void* arg) { |
| return reinterpret_cast<MarkSweep*>(arg)->IsMarked(object); |
| } |
| |
| static void MarkObjectVisitor(const Object* root, void* arg); |
| |
| static void ScanImageRootVisitor(Object* root, void* arg); |
| |
| // Marks an object. |
| void MarkObject(const Object* obj); |
| |
| // Yuck. |
| void MarkObject0(const Object* obj, bool check_finger); |
| |
| static void ScanBitmapCallback(Object* obj, void* finger, void* arg); |
| |
| static void CheckBitmapCallback(Object* obj, void* finger, void* arg); |
| |
| static void SweepCallback(size_t num_ptrs, Object** ptrs, void* arg); |
| |
| void CheckReference(const Object* obj, const Object* ref, MemberOffset offset, bool is_static); |
| |
| // Blackens an object. |
| void ScanObject(const Object* obj); |
| |
| void CheckObject(const Object* obj); |
| |
| // Grays references in instance fields. |
| void ScanInstanceFields(const Object* obj); |
| |
| void CheckInstanceFields(const Object* obj); |
| |
| // Blackens a class object. |
| void ScanClass(const Object* obj); |
| |
| void CheckClass(const Object* obj); |
| |
| // Grays references in static fields. |
| void ScanStaticFields(const Class* klass); |
| |
| void CheckStaticFields(const Class* klass); |
| |
| // Used by ScanInstanceFields and ScanStaticFields |
| void ScanFields(const Object* obj, uint32_t ref_offsets, bool is_static); |
| |
| void CheckFields(const Object* obj, uint32_t ref_offsets, bool is_static); |
| |
| // Grays references in an array. |
| void ScanArray(const Object* obj); |
| |
| void CheckArray(const Object* obj); |
| |
| void ScanOther(const Object* obj); |
| |
| void CheckOther(const Object* obj); |
| |
| // Blackens objects grayed during a garbage collection. |
| void ScanDirtyObjects(); |
| |
| // Schedules an unmarked object for reference processing. |
| void DelayReferenceReferent(Object* reference); |
| |
| // Recursively blackens objects on the mark stack. |
| void ProcessMarkStack(); |
| |
| void EnqueueFinalizerReferences(Object** ref); |
| |
| void PreserveSomeSoftReferences(Object** ref); |
| |
| void ClearWhiteReferences(Object** list); |
| |
| void ProcessReferences(Object** soft_references, bool clear_soft_references, |
| Object** weak_references, |
| Object** finalizer_references, |
| Object** phantom_references); |
| |
| void SweepSystemWeaks(); |
| void SweepJniWeakGlobals(); |
| |
| MarkStack* mark_stack_; |
| |
| Heap* heap_; |
| HeapBitmap* mark_bitmap_; |
| HeapBitmap* live_bitmap_; |
| |
| Object* finger_; |
| |
| Object* condemned_; |
| |
| Object* soft_reference_list_; |
| |
| Object* weak_reference_list_; |
| |
| Object* finalizer_reference_list_; |
| |
| Object* phantom_reference_list_; |
| |
| Object* cleared_reference_list_; |
| |
| size_t class_count_; |
| size_t array_count_; |
| size_t other_count_; |
| |
| friend class InternTableEntryIsUnmarked; |
| |
| DISALLOW_COPY_AND_ASSIGN(MarkSweep); |
| }; |
| |
| } // namespace art |
| |
| #endif // ART_SRC_MARK_SWEEP_H_ |