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 | |
Brian Carlstrom | 578bbdc | 2011-07-21 14:07:47 -0700 | [diff] [blame] | 20 | #include "macros.h" |
| 21 | #include "mark_stack.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: |
Elliott Hughes | 7484741 | 2012-06-20 18:10:21 -0700 | [diff] [blame] | 40 | explicit MarkSweep(MarkStack* 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 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 47 | // Marks the root set at the start of a garbage collection. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 48 | void MarkRoots() |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 49 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 50 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 51 | |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 52 | // Marks the roots in the image space on dirty cards. |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 53 | void ScanDirtyImageRoots() EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -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 | |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 58 | bool IsMarkStackEmpty() const { |
| 59 | return mark_stack_->IsEmpty(); |
| 60 | } |
| 61 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 62 | // Builds a mark stack and recursively mark until it empties. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 63 | void RecursiveMark(bool partial, TimingLogger& timings) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 64 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 65 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 66 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 67 | // Copies mark bits from live bitmap of ZygoteSpace to mark bitmap for partial GCs. |
| 68 | void CopyMarkBits(Space* space); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 69 | |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 70 | // Builds a mark stack with objects on dirty cards and recursively mark |
| 71 | // until it empties. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 72 | void RecursiveMarkDirtyObjects(bool update_finger) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 73 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 74 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 75 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 76 | // Recursive mark objects on specified cards. Updates finger. |
| 77 | void RecursiveMarkCards(CardTable* card_table, const std::vector<byte*>& cards, |
| 78 | TimingLogger& timings) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 79 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 80 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);; |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 81 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 82 | // Remarks the root set after completing the concurrent mark. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 83 | void ReMarkRoots() |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 84 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 85 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 86 | |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 87 | Heap* GetHeap() { |
| 88 | return heap_; |
| 89 | } |
| 90 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 91 | void ProcessReferences(bool clear_soft_references) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 92 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 93 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 94 | ProcessReferences(&soft_reference_list_, clear_soft_references, |
| 95 | &weak_reference_list_, |
| 96 | &finalizer_reference_list_, |
| 97 | &phantom_reference_list_); |
| 98 | } |
| 99 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 100 | // Sweeps unmarked objects to complete the garbage collection. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 101 | void Sweep(bool partial, bool swap_bitmaps) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 102 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 103 | |
| 104 | // Sweep only pointers within an array. WARNING: Trashes objects. |
| 105 | void SweepArray(TimingLogger& logger, MarkStack* allocation_stack_, bool swap_bitmaps) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 106 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 107 | |
Elliott Hughes | adb460d | 2011-10-05 17:02:34 -0700 | [diff] [blame] | 108 | Object* GetClearedReferences() { |
| 109 | return cleared_reference_list_; |
| 110 | } |
| 111 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 112 | // Proxy for external access to ScanObject. |
| 113 | void ScanRoot(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 114 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 115 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 116 | |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 117 | // Blackens an object. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 118 | void ScanObject(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 119 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 120 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 121 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 122 | void SetFinger(Object* new_finger) { |
| 123 | finger_ = new_finger; |
| 124 | } |
| 125 | |
| 126 | void DisableFinger() { |
| 127 | SetFinger(reinterpret_cast<Object*>(~static_cast<uintptr_t>(0))); |
| 128 | } |
| 129 | |
| 130 | size_t GetFreedBytes() const { |
| 131 | return freed_bytes_; |
| 132 | } |
| 133 | |
| 134 | size_t GetFreedObjects() const { |
| 135 | return freed_objects_; |
| 136 | } |
| 137 | |
| 138 | void SetCondemned(Object* condemned) { |
| 139 | condemned_ = condemned; |
| 140 | } |
| 141 | |
| 142 | void SweepSystemWeaks(bool swap_bitmaps) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 143 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 144 | |
Mathieu Chartier | c7b83a0 | 2012-09-11 18:07:39 -0700 | [diff] [blame^] | 145 | static bool VerifyIsLiveCallback(const Object* obj, void* arg) |
| 146 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 147 | |
| 148 | void VerifySystemWeaks() |
| 149 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 150 | |
| 151 | // Verify that an object is live, either in a live bitmap or in the allocation stack. |
| 152 | void VerifyIsLive(const Object* obj) |
| 153 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
| 154 | |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 155 | template <typename Visitor> |
| 156 | static void VisitObjectReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 157 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, |
| 158 | Locks::mutator_lock_) { |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 159 | DCHECK(obj != NULL); |
| 160 | DCHECK(obj->GetClass() != NULL); |
| 161 | if (obj->IsClass()) { |
| 162 | VisitClassReferences(obj, visitor); |
| 163 | } else if (obj->IsArrayInstance()) { |
| 164 | VisitArrayReferences(obj, visitor); |
| 165 | } else { |
| 166 | VisitOtherReferences(obj, visitor); |
| 167 | } |
| 168 | } |
| 169 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 170 | private: |
| 171 | // Returns true if the object has its bit set in the mark bitmap. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 172 | bool IsMarked(const Object* object) const |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 173 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) { |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 174 | DCHECK(current_mark_bitmap_ != NULL); |
Mathieu Chartier | b062fdd | 2012-07-03 09:51:48 -0700 | [diff] [blame] | 175 | if (current_mark_bitmap_->HasAddress(object)) { |
| 176 | return current_mark_bitmap_->Test(object); |
| 177 | } |
| 178 | return heap_->GetMarkBitmap()->Test(object); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 179 | } |
| 180 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 181 | static bool IsMarkedCallback(const Object* object, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 182 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Elliott Hughes | c33a32b | 2011-10-11 18:18:07 -0700 | [diff] [blame] | 183 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 184 | static bool IsLiveCallback(const Object* object, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 185 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 46a2363 | 2012-08-07 18:44:40 -0700 | [diff] [blame] | 186 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 187 | static void MarkObjectVisitor(const Object* root, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 188 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Brian Carlstrom | 1f87008 | 2011-08-23 16:02:11 -0700 | [diff] [blame] | 189 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 190 | static void ReMarkObjectVisitor(const Object* root, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 191 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 192 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 193 | static void VerifyImageRootVisitor(Object* root, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 194 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, |
| 195 | Locks::mutator_lock_); |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 196 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 197 | static void ScanDirtyCardCallback(Object* obj, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 198 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 199 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Mathieu Chartier | 262e5ff | 2012-06-01 17:35:38 -0700 | [diff] [blame] | 200 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 201 | // Marks an object. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 202 | void MarkObject(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 203 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 204 | |
| 205 | // Yuck. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 206 | void MarkObject0(const Object* obj, bool check_finger) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 207 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 208 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 209 | static void ScanBitmapCallback(Object* obj, void* finger, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 210 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 211 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 212 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 213 | static void SweepCallback(size_t num_ptrs, Object** ptrs, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 214 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 215 | |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 216 | // Special sweep for zygote that just marks objects / dirties cards. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 217 | static void ZygoteSweepCallback(size_t num_ptrs, Object** ptrs, void* arg) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 218 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 219 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 220 | 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] | 221 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 222 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 223 | void CheckObject(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 224 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_); |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 225 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 226 | // Grays references in instance fields. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 227 | void ScanInstanceFields(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 228 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 229 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 230 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 231 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 232 | static void VisitInstanceFieldsReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 233 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 234 | DCHECK(obj != NULL); |
| 235 | Class* klass = obj->GetClass(); |
| 236 | DCHECK(klass != NULL); |
| 237 | VisitFieldsReferences(obj, klass->GetReferenceInstanceOffsets(), false, visitor); |
| 238 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 239 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 240 | // Blackens a class object. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 241 | void ScanClass(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 242 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 243 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 244 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 245 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 246 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 247 | static void VisitClassReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 248 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 249 | VisitInstanceFieldsReferences(obj, visitor); |
| 250 | VisitStaticFieldsReferences(obj->AsClass(), visitor); |
| 251 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 252 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 253 | // Grays references in static fields. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 254 | void ScanStaticFields(const Class* klass) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 255 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 256 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 257 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 258 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 259 | static void VisitStaticFieldsReferences(const Class* klass, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 260 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 261 | DCHECK(klass != NULL); |
| 262 | VisitFieldsReferences(klass, klass->GetReferenceStaticOffsets(), true, visitor); |
| 263 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 264 | |
Brian Carlstrom | 4873d46 | 2011-08-21 15:23:39 -0700 | [diff] [blame] | 265 | // Used by ScanInstanceFields and ScanStaticFields |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 266 | void ScanFields(const Object* obj, uint32_t ref_offsets, bool is_static) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 267 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 268 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Brian Carlstrom | 4873d46 | 2011-08-21 15:23:39 -0700 | [diff] [blame] | 269 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 270 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 271 | 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] | 272 | const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 273 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, |
| 274 | Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 275 | if (ref_offsets != CLASS_WALK_SUPER) { |
| 276 | // Found a reference offset bitmap. Mark the specified offsets. |
| 277 | while (ref_offsets != 0) { |
| 278 | size_t right_shift = CLZ(ref_offsets); |
| 279 | MemberOffset field_offset = CLASS_OFFSET_FROM_CLZ(right_shift); |
| 280 | const Object* ref = obj->GetFieldObject<const Object*>(field_offset, false); |
| 281 | visitor(obj, ref, field_offset, is_static); |
| 282 | ref_offsets &= ~(CLASS_HIGH_BIT >> right_shift); |
| 283 | } |
| 284 | } else { |
| 285 | // There is no reference offset bitmap. In the non-static case, |
| 286 | // walk up the class inheritance hierarchy and find reference |
| 287 | // offsets the hard way. In the static case, just consider this |
| 288 | // class. |
| 289 | for (const Class* klass = is_static ? obj->AsClass() : obj->GetClass(); |
| 290 | klass != NULL; |
| 291 | klass = is_static ? NULL : klass->GetSuperClass()) { |
| 292 | size_t num_reference_fields = (is_static |
| 293 | ? klass->NumReferenceStaticFields() |
| 294 | : klass->NumReferenceInstanceFields()); |
| 295 | for (size_t i = 0; i < num_reference_fields; ++i) { |
| 296 | Field* field = (is_static |
| 297 | ? klass->GetStaticField(i) |
| 298 | : klass->GetInstanceField(i)); |
| 299 | MemberOffset field_offset = field->GetOffset(); |
| 300 | const Object* ref = obj->GetFieldObject<const Object*>(field_offset, false); |
| 301 | visitor(obj, ref, field_offset, is_static); |
| 302 | } |
| 303 | } |
| 304 | } |
| 305 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 306 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 307 | // Grays references in an array. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 308 | void ScanArray(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 309 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 310 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 311 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 312 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 313 | static void VisitArrayReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 314 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 315 | visitor(obj, obj->GetClass(), Object::ClassOffset(), false); |
| 316 | if (obj->IsObjectArray()) { |
| 317 | const ObjectArray<Object>* array = obj->AsObjectArray<Object>(); |
| 318 | for (int32_t i = 0; i < array->GetLength(); ++i) { |
| 319 | const Object* element = array->GetWithoutChecks(i); |
| 320 | size_t width = sizeof(Object*); |
| 321 | visitor(obj, element, MemberOffset(i * width + Array::DataOffset(width).Int32Value()), false); |
| 322 | } |
| 323 | } |
| 324 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 325 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 326 | void ScanOther(const Object* obj) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 327 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 328 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 329 | |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 330 | template <typename Visitor> |
Mathieu Chartier | fd678be | 2012-08-30 14:50:54 -0700 | [diff] [blame] | 331 | static void VisitOtherReferences(const Object* obj, const Visitor& visitor) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 332 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_, Locks::mutator_lock_) { |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 333 | return VisitInstanceFieldsReferences(obj, visitor); |
| 334 | } |
Ian Rogers | 5d76c43 | 2011-10-31 21:42:49 -0700 | [diff] [blame] | 335 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 336 | // Blackens objects grayed during a garbage collection. |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 337 | void ScanGrayObjects(bool update_finger) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 338 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 339 | |
| 340 | // Schedules an unmarked object for reference processing. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 341 | void DelayReferenceReferent(Object* reference) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 342 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 343 | |
| 344 | // Recursively blackens objects on the mark stack. |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 345 | void ProcessMarkStack() |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 346 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 347 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 348 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 349 | void EnqueueFinalizerReferences(Object** ref) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 350 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 351 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 352 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 353 | void PreserveSomeSoftReferences(Object** ref) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 354 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 355 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 356 | |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 357 | void ClearWhiteReferences(Object** list) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 358 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 359 | |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 360 | void ProcessReferences(Object** soft_references, bool clear_soft_references, |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 361 | Object** weak_references, |
| 362 | Object** finalizer_references, |
Ian Rogers | 00f7d0e | 2012-07-19 15:28:27 -0700 | [diff] [blame] | 363 | Object** phantom_references) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 364 | EXCLUSIVE_LOCKS_REQUIRED(Locks::heap_bitmap_lock_) |
| 365 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 366 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 367 | void SweepJniWeakGlobals(bool swap_bitmaps) |
Ian Rogers | b726dcb | 2012-09-05 08:57:23 -0700 | [diff] [blame] | 368 | SHARED_LOCKS_REQUIRED(Locks::heap_bitmap_lock_); |
Carl Shapiro | 58551df | 2011-07-24 03:09:51 -0700 | [diff] [blame] | 369 | |
Mathieu Chartier | b062fdd | 2012-07-03 09:51:48 -0700 | [diff] [blame] | 370 | // Current space, we check this space first to avoid searching for the appropriate space for an object. |
| 371 | SpaceBitmap* current_mark_bitmap_; |
| 372 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 373 | MarkStack* mark_stack_; |
| 374 | |
Elliott Hughes | b3bd5f0 | 2012-03-08 21:05:27 -0800 | [diff] [blame] | 375 | Heap* heap_; |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 376 | |
| 377 | Object* finger_; |
| 378 | |
| 379 | Object* condemned_; |
| 380 | |
| 381 | Object* soft_reference_list_; |
| 382 | |
| 383 | Object* weak_reference_list_; |
| 384 | |
| 385 | Object* finalizer_reference_list_; |
| 386 | |
| 387 | Object* phantom_reference_list_; |
| 388 | |
| 389 | Object* cleared_reference_list_; |
| 390 | |
Mathieu Chartier | 357e9be | 2012-08-01 11:00:14 -0700 | [diff] [blame] | 391 | size_t freed_bytes_; |
| 392 | size_t freed_objects_; |
| 393 | |
Elliott Hughes | 352a424 | 2011-10-31 15:15:21 -0700 | [diff] [blame] | 394 | size_t class_count_; |
| 395 | size_t array_count_; |
| 396 | size_t other_count_; |
| 397 | |
Mathieu Chartier | e6e0651 | 2012-06-26 15:00:26 -0700 | [diff] [blame] | 398 | friend class AddIfReachesAllocSpaceVisitor; // Used by mod-union table. |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 399 | friend class CheckBitmapVisitor; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 400 | friend class CheckObjectVisitor; |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 401 | friend class CheckReferenceVisitor; |
Elliott Hughes | 410c0c8 | 2011-09-01 17:58:25 -0700 | [diff] [blame] | 402 | friend class InternTableEntryIsUnmarked; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 403 | friend class MarkIfReachesAllocspaceVisitor; |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 404 | friend class ModUnionCheckReferences; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 405 | friend class ModUnionClearCardVisitor; |
Mathieu Chartier | e6e0651 | 2012-06-26 15:00:26 -0700 | [diff] [blame] | 406 | friend class ModUnionReferenceVisitor; |
Mathieu Chartier | b43b7d4 | 2012-06-19 13:15:09 -0700 | [diff] [blame] | 407 | friend class ModUnionVisitor; |
| 408 | friend class ModUnionTableBitmap; |
Mathieu Chartier | e6e0651 | 2012-06-26 15:00:26 -0700 | [diff] [blame] | 409 | friend class ModUnionTableReferenceCache; |
Mathieu Chartier | cc236d7 | 2012-07-20 10:29:05 -0700 | [diff] [blame] | 410 | friend class ModUnionScanImageRootVisitor; |
| 411 | friend class ScanBitmapVisitor; |
| 412 | friend class ScanImageRootVisitor; |
Elliott Hughes | 410c0c8 | 2011-09-01 17:58:25 -0700 | [diff] [blame] | 413 | |
Carl Shapiro | 69759ea | 2011-07-21 18:13:35 -0700 | [diff] [blame] | 414 | DISALLOW_COPY_AND_ASSIGN(MarkSweep); |
| 415 | }; |
| 416 | |
| 417 | } // namespace art |
| 418 | |
| 419 | #endif // ART_SRC_MARK_SWEEP_H_ |