Elliott Hughes | 2faa5f1 | 2012-01-30 14:42:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 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 | */ |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 16 | |
| 17 | #ifndef ART_SRC_MARK_SWEEP_H_ |
| 18 | #define ART_SRC_MARK_SWEEP_H_ |
| 19 | |
Mathieu Chartier | d8195f1 | 2012-10-05 12:21:28 -0700 | [diff] [blame] | 20 | #include "atomic_stack.h" |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 21 | #include "macros.h" |
Elliott Hughes | 5e71b52 | 2011-10-20 13:12:32 -0700 | [diff] [blame] | 22 | #include "heap_bitmap.h" |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 23 | #include "object.h" |
Ian Rogers | 0cfe1fb | 2011-08-26 03:29:44 -0700 | [diff] [blame] | 24 | #include "offsets.h" |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 25 | |
| 26 | namespace art { |
| 27 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 28 | class CheckObjectVisitor; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 29 | class Class; |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 30 | class Heap; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 31 | class MarkIfReachesAllocspaceVisitor; |
| 32 | class ModUnionClearCardVisitor; |
| 33 | class ModUnionVisitor; |
| 34 | class ModUnionTableBitmap; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 35 | class Object; |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 36 | class TimingLogger; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 37 | |
| 38 | class MarkSweep { |
| 39 | public: |
Mathieu Chartier | d8195f1 | 2012-10-05 12:21:28 -0700 | [diff] [blame] | 40 | explicit MarkSweep(ObjectStack* mark_stack); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 41 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 42 | ~MarkSweep(); |
| 43 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 44 | // Initializes internal structures. |
Jesse Wilson | 078f9b0 | 2011-11-18 17:51:47 -0500 | [diff] [blame] | 45 | void Init(); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 46 | |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 47 | // Find the default mark bitmap. |
| 48 | void FindDefaultMarkBitmap(); |
| 49 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 50 | // Marks the root set at the start of a garbage collection. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 51 | void MarkRoots() |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 52 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 53 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 54 | |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 55 | // Verify that image roots point to only marked objects within the alloc space. |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 56 | void VerifyImageRoots() EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 57 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 58 | // Builds a mark stack and recursively mark until it empties. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 59 | void RecursiveMark(bool partial, TimingLogger& timings) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 60 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 61 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 62 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 63 | // Copies mark bits from live bitmap of ZygoteSpace to mark bitmap for partial GCs. |
Mathieu Chartier | 2fde533 | 2012-09-14 14:51:54 -0700 | [diff] [blame] | 64 | void CopyMarkBits(ContinuousSpace* space); |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 65 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 66 | |
| 67 | void BindLiveToMarkBitmap(ContinuousSpace* space) |
| 68 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 69 | |
| 70 | void UnBindBitmaps() |
| 71 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 72 | |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 73 | // Builds a mark stack with objects on dirty cards and recursively mark |
| 74 | // until it empties. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 75 | void RecursiveMarkDirtyObjects(bool update_finger) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 76 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 77 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 78 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 79 | // Recursive mark objects on specified cards. Updates finger. |
| 80 | void RecursiveMarkCards(CardTable* card_table, const std::vector<byte*>& cards, |
| 81 | TimingLogger& timings) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 82 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 83 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);; |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 84 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 85 | // Remarks the root set after completing the concurrent mark. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 86 | void ReMarkRoots() |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 87 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 88 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 89 | |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 90 | Heap* GetHeap() { |
| 91 | return heap_; |
| 92 | } |
| 93 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 94 | void ProcessReferences(bool clear_soft_references) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 95 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 96 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 97 | ProcessReferences(&soft_reference_list_, clear_soft_references, |
| 98 | &weak_reference_list_, |
| 99 | &finalizer_reference_list_, |
| 100 | &phantom_reference_list_); |
| 101 | } |
| 102 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 103 | // Sweeps unmarked objects to complete the garbage collection. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 104 | void Sweep(bool partial, bool swap_bitmaps) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 105 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 106 | |
Mathieu Chartier | e0f0cb3 | 2012-08-28 11:26:00 -0700 | [diff] [blame] | 107 | // Sweeps unmarked objects to complete the garbage collection. |
| 108 | void SweepLargeObjects(bool swap_bitmaps) |
| 109 | EXCLUSIVE_LOCKS_REQUIRED(GlobalSynchronization::heap_bitmap_lock_); |
| 110 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 111 | // Sweep only pointers within an array. WARNING: Trashes objects. |
Mathieu Chartier | d8195f1 | 2012-10-05 12:21:28 -0700 | [diff] [blame] | 112 | void SweepArray(TimingLogger& logger, ObjectStack* allocation_stack_, bool swap_bitmaps) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 113 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 114 | |
Elliott Hughes | adb460d | 2011-10-05 17:02:34 -0700 | [diff] [blame] | 115 | Object* GetClearedReferences() { |
| 116 | return cleared_reference_list_; |
| 117 | } |
| 118 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 119 | // Proxy for external access to ScanObject. |
| 120 | void ScanRoot(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 121 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 122 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 123 | |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 124 | // Blackens an object. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 125 | void ScanObject(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 126 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 127 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 128 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 129 | void SetFinger(Object* new_finger) { |
| 130 | finger_ = new_finger; |
| 131 | } |
| 132 | |
| 133 | void DisableFinger() { |
| 134 | SetFinger(reinterpret_cast<Object*>(~static_cast<uintptr_t>(0))); |
| 135 | } |
| 136 | |
| 137 | size_t GetFreedBytes() const { |
| 138 | return freed_bytes_; |
| 139 | } |
| 140 | |
| 141 | size_t GetFreedObjects() const { |
| 142 | return freed_objects_; |
| 143 | } |
| 144 | |
Mathieu Chartier | e0f0cb3 | 2012-08-28 11:26:00 -0700 | [diff] [blame] | 145 | // Everything inside the immune range is marked. |
| 146 | void SetImmuneRange(Object* begin, Object* end) { |
| 147 | immune_begin_ = begin; |
| 148 | immune_end_ = end; |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 151 | void SweepSystemWeaks() |
| 152 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 153 | |
| 154 | // Only sweep the weaks which are inside of an allocation stack. |
| 155 | void SweepSystemWeaksArray(ObjectStack* allocations) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 156 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 157 | |
Mathieu Chartier | c7b83a0 | 2012-09-11 18:07:39 -0700 | [diff] [blame] | 158 | static bool VerifyIsLiveCallback(const Object* obj, void* arg) |
| 159 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 160 | |
| 161 | void VerifySystemWeaks() |
| 162 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 163 | |
| 164 | // Verify that an object is live, either in a live bitmap or in the allocation stack. |
| 165 | void VerifyIsLive(const Object* obj) |
| 166 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 167 | |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 168 | template <typename Visitor> |
| 169 | static void VisitObjectReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 170 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, |
| 171 | Locks::mutator_lock_) { |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 172 | DCHECK(obj != NULL); |
| 173 | DCHECK(obj->GetClass() != NULL); |
| 174 | if (obj->IsClass()) { |
| 175 | VisitClassReferences(obj, visitor); |
| 176 | } else if (obj->IsArrayInstance()) { |
| 177 | VisitArrayReferences(obj, visitor); |
| 178 | } else { |
| 179 | VisitOtherReferences(obj, visitor); |
| 180 | } |
| 181 | } |
| 182 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 183 | private: |
| 184 | // Returns true if the object has its bit set in the mark bitmap. |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 185 | bool IsMarked(const Object* object) const; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 186 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 187 | static bool IsMarkedCallback(const Object* object, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 188 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Elliott Hughes | c33a32b | 2011-10-11 18:18:07 -0700 | [diff] [blame] | 189 | |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 190 | static bool IsMarkedArrayCallback(const Object* object, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 191 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 46a2363 | 2012-08-07 18:44:40 -0700 | [diff] [blame] | 192 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 193 | static void MarkObjectVisitor(const Object* root, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 194 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Brian Carlstrom | 1f87008 | 2011-08-23 16:02:11 -0700 | [diff] [blame] | 195 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 196 | static void ReMarkObjectVisitor(const Object* root, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 197 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 198 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 199 | static void VerifyImageRootVisitor(Object* root, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 200 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, |
| 201 | Locks::mutator_lock_); |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 202 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 203 | static void ScanDirtyCardCallback(Object* obj, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 204 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 205 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 206 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 207 | // Marks an object. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 208 | void MarkObject(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 209 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 210 | |
| 211 | // Yuck. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 212 | void MarkObject0(const Object* obj, bool check_finger) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 213 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 214 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 215 | static void ScanBitmapCallback(Object* obj, void* finger, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 216 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 217 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 218 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 219 | static void SweepCallback(size_t num_ptrs, Object** ptrs, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 220 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 221 | |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 222 | // Special sweep for zygote that just marks objects / dirties cards. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 223 | static void ZygoteSweepCallback(size_t num_ptrs, Object** ptrs, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 224 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 225 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 226 | void CheckReference(const Object* obj, const Object* ref, MemberOffset offset, bool is_static) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 227 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 228 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 229 | void CheckObject(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 230 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_); |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 231 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 232 | // Grays references in instance fields. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 233 | void ScanInstanceFields(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 234 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 235 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 236 | |
Mathieu Chartier | 6f1c949 | 2012-10-15 12:08:41 -0700 | [diff] [blame^] | 237 | // Verify the roots of the heap and print out information related to any invalid roots. |
| 238 | // Called in MarkObject, so may we may not hold the mutator lock. |
| 239 | void VerifyRoots() |
| 240 | NO_THREAD_SAFETY_ANALYSIS; |
| 241 | |
| 242 | static void VerifyRootCallback(const Object* root, void* arg, size_t vreg, |
| 243 | const AbstractMethod* method); |
| 244 | |
| 245 | void VerifyRoot(const Object* root, size_t vreg, const AbstractMethod* method) |
| 246 | NO_THREAD_SAFETY_ANALYSIS; |
| 247 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 248 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 249 | static void VisitInstanceFieldsReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 250 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 251 | DCHECK(obj != NULL); |
| 252 | Class* klass = obj->GetClass(); |
| 253 | DCHECK(klass != NULL); |
| 254 | VisitFieldsReferences(obj, klass->GetReferenceInstanceOffsets(), false, visitor); |
| 255 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 256 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 257 | // Blackens a class object. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 258 | void ScanClass(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 259 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 260 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 261 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 262 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 263 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 264 | static void VisitClassReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 265 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 266 | VisitInstanceFieldsReferences(obj, visitor); |
| 267 | VisitStaticFieldsReferences(obj->AsClass(), visitor); |
| 268 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 269 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 270 | // Grays references in static fields. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 271 | void ScanStaticFields(const Class* klass) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 272 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 273 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 274 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 275 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 276 | static void VisitStaticFieldsReferences(const Class* klass, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 277 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 278 | DCHECK(klass != NULL); |
| 279 | VisitFieldsReferences(klass, klass->GetReferenceStaticOffsets(), true, visitor); |
| 280 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 281 | |
Brian Carlstrom | 4873d46 | 2011-08-21 15:23:39 -0700 | [diff] [blame] | 282 | // Used by ScanInstanceFields and ScanStaticFields |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 283 | void ScanFields(const Object* obj, uint32_t ref_offsets, bool is_static) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 284 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 285 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Brian Carlstrom | 4873d46 | 2011-08-21 15:23:39 -0700 | [diff] [blame] | 286 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 287 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 288 | static void VisitFieldsReferences(const Object* obj, uint32_t ref_offsets, bool is_static, |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 289 | const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 290 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, |
| 291 | Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 292 | if (ref_offsets != CLASS_WALK_SUPER) { |
| 293 | // Found a reference offset bitmap. Mark the specified offsets. |
| 294 | while (ref_offsets != 0) { |
| 295 | size_t right_shift = CLZ(ref_offsets); |
| 296 | MemberOffset field_offset = CLASS_OFFSET_FROM_CLZ(right_shift); |
| 297 | const Object* ref = obj->GetFieldObject<const Object*>(field_offset, false); |
| 298 | visitor(obj, ref, field_offset, is_static); |
| 299 | ref_offsets &= ~(CLASS_HIGH_BIT >> right_shift); |
| 300 | } |
| 301 | } else { |
| 302 | // There is no reference offset bitmap. In the non-static case, |
| 303 | // walk up the class inheritance hierarchy and find reference |
| 304 | // offsets the hard way. In the static case, just consider this |
| 305 | // class. |
| 306 | for (const Class* klass = is_static ? obj->AsClass() : obj->GetClass(); |
| 307 | klass != NULL; |
| 308 | klass = is_static ? NULL : klass->GetSuperClass()) { |
| 309 | size_t num_reference_fields = (is_static |
| 310 | ? klass->NumReferenceStaticFields() |
| 311 | : klass->NumReferenceInstanceFields()); |
| 312 | for (size_t i = 0; i < num_reference_fields; ++i) { |
| 313 | Field* field = (is_static |
| 314 | ? klass->GetStaticField(i) |
| 315 | : klass->GetInstanceField(i)); |
| 316 | MemberOffset field_offset = field->GetOffset(); |
| 317 | const Object* ref = obj->GetFieldObject<const Object*>(field_offset, false); |
| 318 | visitor(obj, ref, field_offset, is_static); |
| 319 | } |
| 320 | } |
| 321 | } |
| 322 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 323 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 324 | // Grays references in an array. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 325 | void ScanArray(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 326 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 327 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 328 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 329 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 330 | static void VisitArrayReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 331 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 332 | visitor(obj, obj->GetClass(), Object::ClassOffset(), false); |
| 333 | if (obj->IsObjectArray()) { |
| 334 | const ObjectArray<Object>* array = obj->AsObjectArray<Object>(); |
| 335 | for (int32_t i = 0; i < array->GetLength(); ++i) { |
| 336 | const Object* element = array->GetWithoutChecks(i); |
| 337 | size_t width = sizeof(Object*); |
| 338 | visitor(obj, element, MemberOffset(i * width + Array::DataOffset(width).Int32Value()), false); |
| 339 | } |
| 340 | } |
| 341 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 342 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 343 | void ScanOther(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 344 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 345 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 346 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 347 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 348 | static void VisitOtherReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 349 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 350 | return VisitInstanceFieldsReferences(obj, visitor); |
| 351 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 352 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 353 | // Blackens objects grayed during a garbage collection. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 354 | void ScanGrayObjects(bool update_finger) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 355 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 356 | |
| 357 | // Schedules an unmarked object for reference processing. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 358 | void DelayReferenceReferent(Object* reference) |
Ian Rogers | 23435d0 | 2012-09-24 11:23:12 -0700 | [diff] [blame] | 359 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 360 | |
| 361 | // Recursively blackens objects on the mark stack. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 362 | void ProcessMarkStack() |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 363 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 364 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 365 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 366 | void EnqueueFinalizerReferences(Object** ref) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 367 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 368 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 369 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 370 | void PreserveSomeSoftReferences(Object** ref) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 371 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 372 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 373 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 374 | void ClearWhiteReferences(Object** list) |
Ian Rogers | 23435d0 | 2012-09-24 11:23:12 -0700 | [diff] [blame] | 375 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 376 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 377 | void ProcessReferences(Object** soft_references, bool clear_soft_references, |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 378 | Object** weak_references, |
| 379 | Object** finalizer_references, |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 380 | Object** phantom_references) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 381 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 382 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 383 | |
Mathieu Chartier | 7469ebf | 2012-09-24 16:28:36 -0700 | [diff] [blame] | 384 | void SweepJniWeakGlobals(Heap::IsMarkedTester is_marked, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 385 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 386 | |
Mathieu Chartier | b062fdd | 2012-07-03 09:51:48 -0700 | [diff] [blame] | 387 | // Current space, we check this space first to avoid searching for the appropriate space for an object. |
| 388 | SpaceBitmap* current_mark_bitmap_; |
| 389 | |
Mathieu Chartier | d8195f1 | 2012-10-05 12:21:28 -0700 | [diff] [blame] | 390 | ObjectStack* mark_stack_; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 391 | |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 392 | Heap* heap_; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 393 | |
| 394 | Object* finger_; |
| 395 | |
Mathieu Chartier | e0f0cb3 | 2012-08-28 11:26:00 -0700 | [diff] [blame] | 396 | // Immune range, every object inside the immune range is assumed to be marked. |
| 397 | Object* immune_begin_; |
| 398 | Object* immune_end_; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 399 | |
| 400 | Object* soft_reference_list_; |
| 401 | |
| 402 | Object* weak_reference_list_; |
| 403 | |
| 404 | Object* finalizer_reference_list_; |
| 405 | |
| 406 | Object* phantom_reference_list_; |
| 407 | |
| 408 | Object* cleared_reference_list_; |
| 409 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 410 | size_t freed_bytes_; |
| 411 | size_t freed_objects_; |
| 412 | |
Elliott Hughes | 352a424 | 2011-10-31 15:15:21 -0700 | [diff] [blame] | 413 | size_t class_count_; |
| 414 | size_t array_count_; |
| 415 | size_t other_count_; |
| 416 | |
Mathieu Chartier | e6e0651 | 2012-06-26 15:00:26 -0700 | [diff] [blame] | 417 | friend class AddIfReachesAllocSpaceVisitor; // Used by mod-union table. |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 418 | friend class CheckBitmapVisitor; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 419 | friend class CheckObjectVisitor; |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 420 | friend class CheckReferenceVisitor; |
Elliott Hughes | 410c0c8 | 2011-09-01 17:58:25 -0700 | [diff] [blame] | 421 | friend class InternTableEntryIsUnmarked; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 422 | friend class MarkIfReachesAllocspaceVisitor; |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 423 | friend class ModUnionCheckReferences; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 424 | friend class ModUnionClearCardVisitor; |
Mathieu Chartier | e6e0651 | 2012-06-26 15:00:26 -0700 | [diff] [blame] | 425 | friend class ModUnionReferenceVisitor; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 426 | friend class ModUnionVisitor; |
| 427 | friend class ModUnionTableBitmap; |
Mathieu Chartier | e6e0651 | 2012-06-26 15:00:26 -0700 | [diff] [blame] | 428 | friend class ModUnionTableReferenceCache; |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 429 | friend class ModUnionScanImageRootVisitor; |
| 430 | friend class ScanBitmapVisitor; |
| 431 | friend class ScanImageRootVisitor; |
Elliott Hughes | 410c0c8 | 2011-09-01 17:58:25 -0700 | [diff] [blame] | 432 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 433 | DISALLOW_COPY_AND_ASSIGN(MarkSweep); |
| 434 | }; |
| 435 | |
| 436 | } // namespace art |
| 437 | |
| 438 | #endif // ART_SRC_MARK_SWEEP_H_ |