yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #include "incremental-marking.h" |
| 31 | |
| 32 | #include "code-stubs.h" |
| 33 | #include "compilation-cache.h" |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 34 | #include "objects-visiting.h" |
| 35 | #include "objects-visiting-inl.h" |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 36 | #include "v8conversions.h" |
| 37 | |
| 38 | namespace v8 { |
| 39 | namespace internal { |
| 40 | |
| 41 | |
| 42 | IncrementalMarking::IncrementalMarking(Heap* heap) |
| 43 | : heap_(heap), |
| 44 | state_(STOPPED), |
| 45 | marking_deque_memory_(NULL), |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 46 | marking_deque_memory_committed_(false), |
yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 47 | marker_(this, heap->mark_compact_collector()), |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 48 | steps_count_(0), |
| 49 | steps_took_(0), |
| 50 | longest_step_(0.0), |
| 51 | old_generation_space_available_at_start_of_incremental_(0), |
| 52 | old_generation_space_used_at_start_of_incremental_(0), |
| 53 | steps_count_since_last_gc_(0), |
| 54 | steps_took_since_last_gc_(0), |
| 55 | should_hurry_(false), |
| 56 | allocation_marking_factor_(0), |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 57 | allocated_(0), |
| 58 | no_marking_scope_depth_(0) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | |
| 62 | void IncrementalMarking::TearDown() { |
| 63 | delete marking_deque_memory_; |
| 64 | } |
| 65 | |
| 66 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 67 | void IncrementalMarking::RecordWriteSlow(HeapObject* obj, |
| 68 | Object** slot, |
| 69 | Object* value) { |
| 70 | if (BaseRecordWrite(obj, slot, value) && is_compacting_ && slot != NULL) { |
| 71 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 72 | if (Marking::IsBlack(obj_bit)) { |
| 73 | // Object is not going to be rescanned we need to record the slot. |
| 74 | heap_->mark_compact_collector()->RecordSlot( |
| 75 | HeapObject::RawField(obj, 0), slot, value); |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 81 | void IncrementalMarking::RecordWriteFromCode(HeapObject* obj, |
| 82 | Object* value, |
| 83 | Isolate* isolate) { |
| 84 | ASSERT(obj->IsHeapObject()); |
| 85 | |
| 86 | // Fast cases should already be covered by RecordWriteStub. |
| 87 | ASSERT(value->IsHeapObject()); |
| 88 | ASSERT(!value->IsHeapNumber()); |
svenpanne@chromium.org | a8bb4d9 | 2011-10-10 13:20:40 +0000 | [diff] [blame] | 89 | ASSERT(!value->IsString() || |
| 90 | value->IsConsString() || |
| 91 | value->IsSlicedString()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 92 | ASSERT(Marking::IsWhite(Marking::MarkBitFrom(HeapObject::cast(value)))); |
| 93 | |
| 94 | IncrementalMarking* marking = isolate->heap()->incremental_marking(); |
| 95 | ASSERT(!marking->is_compacting_); |
| 96 | marking->RecordWrite(obj, NULL, value); |
| 97 | } |
| 98 | |
| 99 | |
| 100 | void IncrementalMarking::RecordWriteForEvacuationFromCode(HeapObject* obj, |
| 101 | Object** slot, |
| 102 | Isolate* isolate) { |
| 103 | IncrementalMarking* marking = isolate->heap()->incremental_marking(); |
| 104 | ASSERT(marking->is_compacting_); |
| 105 | marking->RecordWrite(obj, slot, *slot); |
| 106 | } |
| 107 | |
| 108 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 109 | void IncrementalMarking::RecordCodeTargetPatch(Code* host, |
| 110 | Address pc, |
| 111 | HeapObject* value) { |
| 112 | if (IsMarking()) { |
| 113 | RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host); |
| 114 | RecordWriteIntoCode(host, &rinfo, value); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 119 | void IncrementalMarking::RecordCodeTargetPatch(Address pc, HeapObject* value) { |
| 120 | if (IsMarking()) { |
| 121 | Code* host = heap_->isolate()->inner_pointer_to_code_cache()-> |
| 122 | GcSafeFindCodeForInnerPointer(pc); |
| 123 | RelocInfo rinfo(pc, RelocInfo::CODE_TARGET, 0, host); |
| 124 | RecordWriteIntoCode(host, &rinfo, value); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 129 | void IncrementalMarking::RecordWriteOfCodeEntrySlow(JSFunction* host, |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 130 | Object** slot, |
| 131 | Code* value) { |
| 132 | if (BaseRecordWrite(host, slot, value) && is_compacting_) { |
| 133 | ASSERT(slot != NULL); |
| 134 | heap_->mark_compact_collector()-> |
| 135 | RecordCodeEntrySlot(reinterpret_cast<Address>(slot), value); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | |
jkummerow@chromium.org | c3b3712 | 2011-11-07 10:14:12 +0000 | [diff] [blame] | 140 | void IncrementalMarking::RecordWriteIntoCodeSlow(HeapObject* obj, |
| 141 | RelocInfo* rinfo, |
| 142 | Object* value) { |
| 143 | MarkBit value_bit = Marking::MarkBitFrom(HeapObject::cast(value)); |
| 144 | if (Marking::IsWhite(value_bit)) { |
| 145 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 146 | if (Marking::IsBlack(obj_bit)) { |
| 147 | BlackToGreyAndUnshift(obj, obj_bit); |
| 148 | RestartIfNotMarking(); |
| 149 | } |
| 150 | // Object is either grey or white. It will be scanned if survives. |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | if (is_compacting_) { |
| 155 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 156 | if (Marking::IsBlack(obj_bit)) { |
| 157 | // Object is not going to be rescanned. We need to record the slot. |
| 158 | heap_->mark_compact_collector()->RecordRelocSlot(rinfo, |
| 159 | Code::cast(value)); |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 164 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 165 | class IncrementalMarkingMarkingVisitor |
| 166 | : public StaticMarkingVisitor<IncrementalMarkingMarkingVisitor> { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 167 | public: |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 168 | static void Initialize() { |
| 169 | StaticMarkingVisitor<IncrementalMarkingMarkingVisitor>::Initialize(); |
| 170 | |
| 171 | table_.Register(kVisitSharedFunctionInfo, &VisitSharedFunctionInfo); |
| 172 | |
| 173 | table_.Register(kVisitJSFunction, &VisitJSFunction); |
| 174 | |
| 175 | table_.Register(kVisitJSRegExp, &VisitJSRegExp); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 176 | } |
| 177 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 178 | static inline void VisitEmbeddedPointer(Heap* heap, RelocInfo* rinfo) { |
rossberg@chromium.org | b4b2aa6 | 2011-10-13 09:49:59 +0000 | [diff] [blame] | 179 | ASSERT(rinfo->rmode() == RelocInfo::EMBEDDED_OBJECT); |
| 180 | Object* target = rinfo->target_object(); |
| 181 | if (target->NonFailureIsHeapObject()) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 182 | heap->mark_compact_collector()->RecordRelocSlot(rinfo, target); |
| 183 | MarkObject(heap, target); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 184 | } |
| 185 | } |
| 186 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 187 | static inline void VisitCodeTarget(Heap* heap, RelocInfo* rinfo) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 188 | ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode())); |
danno@chromium.org | 88aa058 | 2012-03-23 15:11:57 +0000 | [diff] [blame] | 189 | Code* target = Code::GetCodeFromTargetAddress(rinfo->target_address()); |
| 190 | if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub() |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 191 | && (target->ic_age() != heap->global_ic_age())) { |
danno@chromium.org | 88aa058 | 2012-03-23 15:11:57 +0000 | [diff] [blame] | 192 | IC::Clear(rinfo->pc()); |
| 193 | target = Code::GetCodeFromTargetAddress(rinfo->target_address()); |
| 194 | } |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 195 | heap->mark_compact_collector()->RecordRelocSlot(rinfo, Code::cast(target)); |
| 196 | MarkObject(heap, target); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 197 | } |
| 198 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 199 | static void VisitCode(Map* map, HeapObject* object) { |
| 200 | Heap* heap = map->GetHeap(); |
| 201 | Code* code = reinterpret_cast<Code*>(object); |
| 202 | code->CodeIterateBody<IncrementalMarkingMarkingVisitor>(heap); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 203 | } |
| 204 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 205 | static void VisitJSWeakMap(Map* map, HeapObject* object) { |
| 206 | Heap* heap = map->GetHeap(); |
| 207 | VisitPointers(heap, |
| 208 | HeapObject::RawField(object, JSWeakMap::kPropertiesOffset), |
| 209 | HeapObject::RawField(object, JSWeakMap::kSize)); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 210 | } |
| 211 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 212 | static void VisitSharedFunctionInfo(Map* map, HeapObject* object) { |
| 213 | Heap* heap = map->GetHeap(); |
| 214 | SharedFunctionInfo* shared = SharedFunctionInfo::cast(object); |
| 215 | if (shared->ic_age() != heap->global_ic_age()) { |
| 216 | shared->ResetForNewContext(heap->global_ic_age()); |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 217 | } |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 218 | FixedBodyVisitor<IncrementalMarkingMarkingVisitor, |
| 219 | SharedFunctionInfo::BodyDescriptor, |
| 220 | void>::Visit(map, object); |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 221 | } |
| 222 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 223 | static inline void VisitJSFunction(Map* map, HeapObject* object) { |
| 224 | Heap* heap = map->GetHeap(); |
| 225 | // Iterate over all fields in the body but take care in dealing with |
| 226 | // the code entry and skip weak fields. |
| 227 | VisitPointers(heap, |
| 228 | HeapObject::RawField(object, JSFunction::kPropertiesOffset), |
| 229 | HeapObject::RawField(object, JSFunction::kCodeEntryOffset)); |
| 230 | VisitCodeEntry(heap, object->address() + JSFunction::kCodeEntryOffset); |
| 231 | VisitPointers(heap, |
| 232 | HeapObject::RawField(object, |
| 233 | JSFunction::kCodeEntryOffset + kPointerSize), |
| 234 | HeapObject::RawField(object, |
| 235 | JSFunction::kNonWeakFieldsEndOffset)); |
| 236 | } |
| 237 | |
| 238 | INLINE(static void VisitPointer(Heap* heap, Object** p)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 239 | Object* obj = *p; |
| 240 | if (obj->NonFailureIsHeapObject()) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 241 | heap->mark_compact_collector()->RecordSlot(p, p, obj); |
| 242 | MarkObject(heap, obj); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 243 | } |
| 244 | } |
| 245 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 246 | INLINE(static void VisitPointers(Heap* heap, Object** start, Object** end)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 247 | for (Object** p = start; p < end; p++) { |
| 248 | Object* obj = *p; |
| 249 | if (obj->NonFailureIsHeapObject()) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 250 | heap->mark_compact_collector()->RecordSlot(start, p, obj); |
| 251 | MarkObject(heap, obj); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | } |
| 255 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 256 | INLINE(static void MarkObject(Heap* heap, Object* obj)) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 257 | HeapObject* heap_object = HeapObject::cast(obj); |
| 258 | MarkBit mark_bit = Marking::MarkBitFrom(heap_object); |
| 259 | if (mark_bit.data_only()) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 260 | if (heap->incremental_marking()->MarkBlackOrKeepGrey(mark_bit)) { |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 261 | MemoryChunk::IncrementLiveBytesFromGC(heap_object->address(), |
| 262 | heap_object->Size()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 263 | } |
| 264 | } else if (Marking::IsWhite(mark_bit)) { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 265 | heap->incremental_marking()->WhiteToGreyAndPush(heap_object, mark_bit); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 266 | } |
| 267 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 268 | }; |
| 269 | |
| 270 | |
| 271 | class IncrementalMarkingRootMarkingVisitor : public ObjectVisitor { |
| 272 | public: |
| 273 | IncrementalMarkingRootMarkingVisitor(Heap* heap, |
| 274 | IncrementalMarking* incremental_marking) |
| 275 | : heap_(heap), |
| 276 | incremental_marking_(incremental_marking) { |
| 277 | } |
| 278 | |
| 279 | void VisitPointer(Object** p) { |
| 280 | MarkObjectByPointer(p); |
| 281 | } |
| 282 | |
| 283 | void VisitPointers(Object** start, Object** end) { |
| 284 | for (Object** p = start; p < end; p++) MarkObjectByPointer(p); |
| 285 | } |
| 286 | |
| 287 | private: |
| 288 | void MarkObjectByPointer(Object** p) { |
| 289 | Object* obj = *p; |
| 290 | if (!obj->IsHeapObject()) return; |
| 291 | |
| 292 | HeapObject* heap_object = HeapObject::cast(obj); |
| 293 | MarkBit mark_bit = Marking::MarkBitFrom(heap_object); |
| 294 | if (mark_bit.data_only()) { |
| 295 | if (incremental_marking_->MarkBlackOrKeepGrey(mark_bit)) { |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 296 | MemoryChunk::IncrementLiveBytesFromGC(heap_object->address(), |
| 297 | heap_object->Size()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 298 | } |
| 299 | } else { |
| 300 | if (Marking::IsWhite(mark_bit)) { |
| 301 | incremental_marking_->WhiteToGreyAndPush(heap_object, mark_bit); |
| 302 | } |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | Heap* heap_; |
| 307 | IncrementalMarking* incremental_marking_; |
| 308 | }; |
| 309 | |
| 310 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 311 | void IncrementalMarking::Initialize() { |
| 312 | IncrementalMarkingMarkingVisitor::Initialize(); |
| 313 | } |
| 314 | |
| 315 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 316 | void IncrementalMarking::SetOldSpacePageFlags(MemoryChunk* chunk, |
| 317 | bool is_marking, |
| 318 | bool is_compacting) { |
| 319 | if (is_marking) { |
| 320 | chunk->SetFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 321 | chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 322 | |
| 323 | // It's difficult to filter out slots recorded for large objects. |
| 324 | if (chunk->owner()->identity() == LO_SPACE && |
| 325 | chunk->size() > static_cast<size_t>(Page::kPageSize) && |
| 326 | is_compacting) { |
| 327 | chunk->SetFlag(MemoryChunk::RESCAN_ON_EVACUATION); |
| 328 | } |
| 329 | } else if (chunk->owner()->identity() == CELL_SPACE || |
| 330 | chunk->scan_on_scavenge()) { |
| 331 | chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 332 | chunk->ClearFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 333 | } else { |
| 334 | chunk->ClearFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 335 | chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | |
| 340 | void IncrementalMarking::SetNewSpacePageFlags(NewSpacePage* chunk, |
| 341 | bool is_marking) { |
| 342 | chunk->SetFlag(MemoryChunk::POINTERS_TO_HERE_ARE_INTERESTING); |
| 343 | if (is_marking) { |
| 344 | chunk->SetFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 345 | } else { |
| 346 | chunk->ClearFlag(MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING); |
| 347 | } |
| 348 | chunk->SetFlag(MemoryChunk::SCAN_ON_SCAVENGE); |
| 349 | } |
| 350 | |
| 351 | |
| 352 | void IncrementalMarking::DeactivateIncrementalWriteBarrierForSpace( |
| 353 | PagedSpace* space) { |
| 354 | PageIterator it(space); |
| 355 | while (it.has_next()) { |
| 356 | Page* p = it.next(); |
| 357 | SetOldSpacePageFlags(p, false, false); |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | |
| 362 | void IncrementalMarking::DeactivateIncrementalWriteBarrierForSpace( |
| 363 | NewSpace* space) { |
| 364 | NewSpacePageIterator it(space); |
| 365 | while (it.has_next()) { |
| 366 | NewSpacePage* p = it.next(); |
| 367 | SetNewSpacePageFlags(p, false); |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | |
| 372 | void IncrementalMarking::DeactivateIncrementalWriteBarrier() { |
| 373 | DeactivateIncrementalWriteBarrierForSpace(heap_->old_pointer_space()); |
| 374 | DeactivateIncrementalWriteBarrierForSpace(heap_->old_data_space()); |
| 375 | DeactivateIncrementalWriteBarrierForSpace(heap_->cell_space()); |
| 376 | DeactivateIncrementalWriteBarrierForSpace(heap_->map_space()); |
| 377 | DeactivateIncrementalWriteBarrierForSpace(heap_->code_space()); |
| 378 | DeactivateIncrementalWriteBarrierForSpace(heap_->new_space()); |
| 379 | |
| 380 | LargePage* lop = heap_->lo_space()->first_page(); |
| 381 | while (lop->is_valid()) { |
| 382 | SetOldSpacePageFlags(lop, false, false); |
| 383 | lop = lop->next_page(); |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | |
| 388 | void IncrementalMarking::ActivateIncrementalWriteBarrier(PagedSpace* space) { |
| 389 | PageIterator it(space); |
| 390 | while (it.has_next()) { |
| 391 | Page* p = it.next(); |
| 392 | SetOldSpacePageFlags(p, true, is_compacting_); |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | |
| 397 | void IncrementalMarking::ActivateIncrementalWriteBarrier(NewSpace* space) { |
| 398 | NewSpacePageIterator it(space->ToSpaceStart(), space->ToSpaceEnd()); |
| 399 | while (it.has_next()) { |
| 400 | NewSpacePage* p = it.next(); |
| 401 | SetNewSpacePageFlags(p, true); |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | |
| 406 | void IncrementalMarking::ActivateIncrementalWriteBarrier() { |
| 407 | ActivateIncrementalWriteBarrier(heap_->old_pointer_space()); |
| 408 | ActivateIncrementalWriteBarrier(heap_->old_data_space()); |
| 409 | ActivateIncrementalWriteBarrier(heap_->cell_space()); |
| 410 | ActivateIncrementalWriteBarrier(heap_->map_space()); |
| 411 | ActivateIncrementalWriteBarrier(heap_->code_space()); |
| 412 | ActivateIncrementalWriteBarrier(heap_->new_space()); |
| 413 | |
| 414 | LargePage* lop = heap_->lo_space()->first_page(); |
| 415 | while (lop->is_valid()) { |
| 416 | SetOldSpacePageFlags(lop, true, is_compacting_); |
| 417 | lop = lop->next_page(); |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | |
| 422 | bool IncrementalMarking::WorthActivating() { |
| 423 | #ifndef DEBUG |
| 424 | static const intptr_t kActivationThreshold = 8 * MB; |
| 425 | #else |
| 426 | // TODO(gc) consider setting this to some low level so that some |
| 427 | // debug tests run with incremental marking and some without. |
| 428 | static const intptr_t kActivationThreshold = 0; |
| 429 | #endif |
| 430 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 431 | return !FLAG_expose_gc && |
| 432 | FLAG_incremental_marking && |
rossberg@chromium.org | b4b2aa6 | 2011-10-13 09:49:59 +0000 | [diff] [blame] | 433 | !Serializer::enabled() && |
yangguo@chromium.org | 154ff99 | 2012-03-13 08:09:54 +0000 | [diff] [blame] | 434 | heap_->PromotedSpaceSizeOfObjects() > kActivationThreshold; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | |
| 438 | void IncrementalMarking::ActivateGeneratedStub(Code* stub) { |
| 439 | ASSERT(RecordWriteStub::GetMode(stub) == |
| 440 | RecordWriteStub::STORE_BUFFER_ONLY); |
| 441 | |
| 442 | if (!IsMarking()) { |
| 443 | // Initially stub is generated in STORE_BUFFER_ONLY mode thus |
| 444 | // we don't need to do anything if incremental marking is |
| 445 | // not active. |
| 446 | } else if (IsCompacting()) { |
| 447 | RecordWriteStub::Patch(stub, RecordWriteStub::INCREMENTAL_COMPACTION); |
| 448 | } else { |
| 449 | RecordWriteStub::Patch(stub, RecordWriteStub::INCREMENTAL); |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | |
| 454 | static void PatchIncrementalMarkingRecordWriteStubs( |
| 455 | Heap* heap, RecordWriteStub::Mode mode) { |
erik.corry@gmail.com | f2038fb | 2012-01-16 11:42:08 +0000 | [diff] [blame] | 456 | UnseededNumberDictionary* stubs = heap->code_stubs(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 457 | |
| 458 | int capacity = stubs->Capacity(); |
| 459 | for (int i = 0; i < capacity; i++) { |
| 460 | Object* k = stubs->KeyAt(i); |
| 461 | if (stubs->IsKey(k)) { |
| 462 | uint32_t key = NumberToUint32(k); |
| 463 | |
| 464 | if (CodeStub::MajorKeyFromKey(key) == |
| 465 | CodeStub::RecordWrite) { |
| 466 | Object* e = stubs->ValueAt(i); |
| 467 | if (e->IsCode()) { |
| 468 | RecordWriteStub::Patch(Code::cast(e), mode); |
| 469 | } |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | |
| 476 | void IncrementalMarking::EnsureMarkingDequeIsCommitted() { |
| 477 | if (marking_deque_memory_ == NULL) { |
| 478 | marking_deque_memory_ = new VirtualMemory(4 * MB); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 479 | } |
| 480 | if (!marking_deque_memory_committed_) { |
| 481 | bool success = marking_deque_memory_->Commit( |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 482 | reinterpret_cast<Address>(marking_deque_memory_->address()), |
| 483 | marking_deque_memory_->size(), |
| 484 | false); // Not executable. |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 485 | CHECK(success); |
| 486 | marking_deque_memory_committed_ = true; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | void IncrementalMarking::UncommitMarkingDeque() { |
ricow@chromium.org | 27bf288 | 2011-11-17 08:34:43 +0000 | [diff] [blame] | 491 | if (state_ == STOPPED && marking_deque_memory_committed_) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 492 | bool success = marking_deque_memory_->Uncommit( |
| 493 | reinterpret_cast<Address>(marking_deque_memory_->address()), |
| 494 | marking_deque_memory_->size()); |
| 495 | CHECK(success); |
| 496 | marking_deque_memory_committed_ = false; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 497 | } |
| 498 | } |
| 499 | |
| 500 | |
| 501 | void IncrementalMarking::Start() { |
| 502 | if (FLAG_trace_incremental_marking) { |
| 503 | PrintF("[IncrementalMarking] Start\n"); |
| 504 | } |
| 505 | ASSERT(FLAG_incremental_marking); |
| 506 | ASSERT(state_ == STOPPED); |
| 507 | |
| 508 | ResetStepCounters(); |
| 509 | |
| 510 | if (heap_->old_pointer_space()->IsSweepingComplete() && |
| 511 | heap_->old_data_space()->IsSweepingComplete()) { |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 512 | StartMarking(ALLOW_COMPACTION); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 513 | } else { |
| 514 | if (FLAG_trace_incremental_marking) { |
| 515 | PrintF("[IncrementalMarking] Start sweeping.\n"); |
| 516 | } |
| 517 | state_ = SWEEPING; |
| 518 | } |
| 519 | |
| 520 | heap_->new_space()->LowerInlineAllocationLimit(kAllocatedThreshold); |
| 521 | } |
| 522 | |
| 523 | |
| 524 | static void MarkObjectGreyDoNotEnqueue(Object* obj) { |
| 525 | if (obj->IsHeapObject()) { |
| 526 | HeapObject* heap_obj = HeapObject::cast(obj); |
| 527 | MarkBit mark_bit = Marking::MarkBitFrom(HeapObject::cast(obj)); |
| 528 | if (Marking::IsBlack(mark_bit)) { |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 529 | MemoryChunk::IncrementLiveBytesFromGC(heap_obj->address(), |
| 530 | -heap_obj->Size()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 531 | } |
| 532 | Marking::AnyToGrey(mark_bit); |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 537 | void IncrementalMarking::StartMarking(CompactionFlag flag) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 538 | if (FLAG_trace_incremental_marking) { |
| 539 | PrintF("[IncrementalMarking] Start marking\n"); |
| 540 | } |
| 541 | |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 542 | is_compacting_ = !FLAG_never_compact && (flag == ALLOW_COMPACTION) && |
jkummerow@chromium.org | ab7dad4 | 2012-02-07 12:07:34 +0000 | [diff] [blame] | 543 | heap_->mark_compact_collector()->StartCompaction( |
| 544 | MarkCompactCollector::INCREMENTAL_COMPACTION); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 545 | |
| 546 | state_ = MARKING; |
| 547 | |
| 548 | RecordWriteStub::Mode mode = is_compacting_ ? |
| 549 | RecordWriteStub::INCREMENTAL_COMPACTION : RecordWriteStub::INCREMENTAL; |
| 550 | |
| 551 | PatchIncrementalMarkingRecordWriteStubs(heap_, mode); |
| 552 | |
| 553 | EnsureMarkingDequeIsCommitted(); |
| 554 | |
| 555 | // Initialize marking stack. |
| 556 | Address addr = static_cast<Address>(marking_deque_memory_->address()); |
| 557 | size_t size = marking_deque_memory_->size(); |
| 558 | if (FLAG_force_marking_deque_overflows) size = 64 * kPointerSize; |
| 559 | marking_deque_.Initialize(addr, addr + size); |
| 560 | |
| 561 | ActivateIncrementalWriteBarrier(); |
| 562 | |
| 563 | #ifdef DEBUG |
| 564 | // Marking bits are cleared by the sweeper. |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 565 | if (FLAG_verify_heap) { |
| 566 | heap_->mark_compact_collector()->VerifyMarkbitsAreClean(); |
| 567 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 568 | #endif |
| 569 | |
| 570 | heap_->CompletelyClearInstanceofCache(); |
| 571 | heap_->isolate()->compilation_cache()->MarkCompactPrologue(); |
| 572 | |
| 573 | if (FLAG_cleanup_code_caches_at_gc) { |
| 574 | // We will mark cache black with a separate pass |
| 575 | // when we finish marking. |
| 576 | MarkObjectGreyDoNotEnqueue(heap_->polymorphic_code_cache()); |
| 577 | } |
| 578 | |
| 579 | // Mark strong roots grey. |
| 580 | IncrementalMarkingRootMarkingVisitor visitor(heap_, this); |
| 581 | heap_->IterateStrongRoots(&visitor, VISIT_ONLY_STRONG); |
| 582 | |
| 583 | // Ready to start incremental marking. |
| 584 | if (FLAG_trace_incremental_marking) { |
| 585 | PrintF("[IncrementalMarking] Running\n"); |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | |
| 590 | void IncrementalMarking::PrepareForScavenge() { |
| 591 | if (!IsMarking()) return; |
| 592 | NewSpacePageIterator it(heap_->new_space()->FromSpaceStart(), |
| 593 | heap_->new_space()->FromSpaceEnd()); |
| 594 | while (it.has_next()) { |
| 595 | Bitmap::Clear(it.next()); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | |
| 600 | void IncrementalMarking::UpdateMarkingDequeAfterScavenge() { |
| 601 | if (!IsMarking()) return; |
| 602 | |
| 603 | int current = marking_deque_.bottom(); |
| 604 | int mask = marking_deque_.mask(); |
| 605 | int limit = marking_deque_.top(); |
| 606 | HeapObject** array = marking_deque_.array(); |
| 607 | int new_top = current; |
| 608 | |
| 609 | Map* filler_map = heap_->one_pointer_filler_map(); |
| 610 | |
| 611 | while (current != limit) { |
| 612 | HeapObject* obj = array[current]; |
| 613 | ASSERT(obj->IsHeapObject()); |
| 614 | current = ((current + 1) & mask); |
| 615 | if (heap_->InNewSpace(obj)) { |
| 616 | MapWord map_word = obj->map_word(); |
| 617 | if (map_word.IsForwardingAddress()) { |
| 618 | HeapObject* dest = map_word.ToForwardingAddress(); |
| 619 | array[new_top] = dest; |
| 620 | new_top = ((new_top + 1) & mask); |
| 621 | ASSERT(new_top != marking_deque_.bottom()); |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 622 | #ifdef DEBUG |
| 623 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 624 | ASSERT(Marking::IsGrey(mark_bit) || |
| 625 | (obj->IsFiller() && Marking::IsWhite(mark_bit))); |
| 626 | #endif |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 627 | } |
| 628 | } else if (obj->map() != filler_map) { |
| 629 | // Skip one word filler objects that appear on the |
| 630 | // stack when we perform in place array shift. |
| 631 | array[new_top] = obj; |
| 632 | new_top = ((new_top + 1) & mask); |
| 633 | ASSERT(new_top != marking_deque_.bottom()); |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 634 | #ifdef DEBUG |
| 635 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 636 | ASSERT(Marking::IsGrey(mark_bit) || |
| 637 | (obj->IsFiller() && Marking::IsWhite(mark_bit))); |
| 638 | #endif |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 639 | } |
| 640 | } |
| 641 | marking_deque_.set_top(new_top); |
| 642 | |
| 643 | steps_took_since_last_gc_ = 0; |
| 644 | steps_count_since_last_gc_ = 0; |
| 645 | longest_step_ = 0.0; |
| 646 | } |
| 647 | |
| 648 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 649 | void IncrementalMarking::Hurry() { |
| 650 | if (state() == MARKING) { |
| 651 | double start = 0.0; |
| 652 | if (FLAG_trace_incremental_marking) { |
| 653 | PrintF("[IncrementalMarking] Hurry\n"); |
| 654 | start = OS::TimeCurrentMillis(); |
| 655 | } |
| 656 | // TODO(gc) hurry can mark objects it encounters black as mutator |
| 657 | // was stopped. |
| 658 | Map* filler_map = heap_->one_pointer_filler_map(); |
| 659 | Map* global_context_map = heap_->global_context_map(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 660 | while (!marking_deque_.IsEmpty()) { |
| 661 | HeapObject* obj = marking_deque_.Pop(); |
| 662 | |
| 663 | // Explicitly skip one word fillers. Incremental markbit patterns are |
| 664 | // correct only for objects that occupy at least two words. |
| 665 | Map* map = obj->map(); |
| 666 | if (map == filler_map) { |
| 667 | continue; |
| 668 | } else if (map == global_context_map) { |
| 669 | // Global contexts have weak fields. |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 670 | IncrementalMarkingMarkingVisitor::VisitGlobalContext(map, obj); |
yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 671 | } else if (map->instance_type() == MAP_TYPE) { |
| 672 | Map* map = Map::cast(obj); |
| 673 | heap_->ClearCacheOnMap(map); |
| 674 | |
| 675 | // When map collection is enabled we have to mark through map's |
| 676 | // transitions and back pointers in a special way to make these links |
| 677 | // weak. Only maps for subclasses of JSReceiver can have transitions. |
| 678 | STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE); |
| 679 | if (FLAG_collect_maps && |
| 680 | map->instance_type() >= FIRST_JS_RECEIVER_TYPE) { |
| 681 | marker_.MarkMapContents(map); |
| 682 | } else { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 683 | IncrementalMarkingMarkingVisitor::VisitPointers( |
| 684 | heap_, |
yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 685 | HeapObject::RawField(map, Map::kPointerFieldsBeginOffset), |
| 686 | HeapObject::RawField(map, Map::kPointerFieldsEndOffset)); |
| 687 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 688 | } else { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 689 | MarkBit map_mark_bit = Marking::MarkBitFrom(map); |
| 690 | if (Marking::IsWhite(map_mark_bit)) { |
| 691 | WhiteToGreyAndPush(map, map_mark_bit); |
| 692 | } |
| 693 | IncrementalMarkingMarkingVisitor::IterateBody(map, obj); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | MarkBit mark_bit = Marking::MarkBitFrom(obj); |
| 697 | ASSERT(!Marking::IsBlack(mark_bit)); |
| 698 | Marking::MarkBlack(mark_bit); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 699 | MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size()); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 700 | } |
| 701 | state_ = COMPLETE; |
| 702 | if (FLAG_trace_incremental_marking) { |
| 703 | double end = OS::TimeCurrentMillis(); |
| 704 | PrintF("[IncrementalMarking] Complete (hurry), spent %d ms.\n", |
| 705 | static_cast<int>(end - start)); |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | if (FLAG_cleanup_code_caches_at_gc) { |
| 710 | PolymorphicCodeCache* poly_cache = heap_->polymorphic_code_cache(); |
| 711 | Marking::GreyToBlack(Marking::MarkBitFrom(poly_cache)); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 712 | MemoryChunk::IncrementLiveBytesFromGC(poly_cache->address(), |
| 713 | PolymorphicCodeCache::kSize); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | Object* context = heap_->global_contexts_list(); |
| 717 | while (!context->IsUndefined()) { |
ricow@chromium.org | 7ad6522 | 2011-12-19 12:13:11 +0000 | [diff] [blame] | 718 | // GC can happen when the context is not fully initialized, |
| 719 | // so the cache can be undefined. |
| 720 | HeapObject* cache = HeapObject::cast( |
| 721 | Context::cast(context)->get(Context::NORMALIZED_MAP_CACHE_INDEX)); |
| 722 | if (!cache->IsUndefined()) { |
| 723 | MarkBit mark_bit = Marking::MarkBitFrom(cache); |
| 724 | if (Marking::IsGrey(mark_bit)) { |
| 725 | Marking::GreyToBlack(mark_bit); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 726 | MemoryChunk::IncrementLiveBytesFromGC(cache->address(), cache->Size()); |
ricow@chromium.org | 7ad6522 | 2011-12-19 12:13:11 +0000 | [diff] [blame] | 727 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 728 | } |
| 729 | context = Context::cast(context)->get(Context::NEXT_CONTEXT_LINK); |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | |
| 734 | void IncrementalMarking::Abort() { |
| 735 | if (IsStopped()) return; |
| 736 | if (FLAG_trace_incremental_marking) { |
| 737 | PrintF("[IncrementalMarking] Aborting.\n"); |
| 738 | } |
| 739 | heap_->new_space()->LowerInlineAllocationLimit(0); |
| 740 | IncrementalMarking::set_should_hurry(false); |
| 741 | ResetStepCounters(); |
| 742 | if (IsMarking()) { |
| 743 | PatchIncrementalMarkingRecordWriteStubs(heap_, |
| 744 | RecordWriteStub::STORE_BUFFER_ONLY); |
| 745 | DeactivateIncrementalWriteBarrier(); |
| 746 | |
| 747 | if (is_compacting_) { |
| 748 | LargeObjectIterator it(heap_->lo_space()); |
| 749 | for (HeapObject* obj = it.Next(); obj != NULL; obj = it.Next()) { |
| 750 | Page* p = Page::FromAddress(obj->address()); |
| 751 | if (p->IsFlagSet(Page::RESCAN_ON_EVACUATION)) { |
| 752 | p->ClearFlag(Page::RESCAN_ON_EVACUATION); |
| 753 | } |
| 754 | } |
| 755 | } |
| 756 | } |
| 757 | heap_->isolate()->stack_guard()->Continue(GC_REQUEST); |
| 758 | state_ = STOPPED; |
| 759 | is_compacting_ = false; |
| 760 | } |
| 761 | |
| 762 | |
| 763 | void IncrementalMarking::Finalize() { |
| 764 | Hurry(); |
| 765 | state_ = STOPPED; |
| 766 | is_compacting_ = false; |
| 767 | heap_->new_space()->LowerInlineAllocationLimit(0); |
| 768 | IncrementalMarking::set_should_hurry(false); |
| 769 | ResetStepCounters(); |
| 770 | PatchIncrementalMarkingRecordWriteStubs(heap_, |
| 771 | RecordWriteStub::STORE_BUFFER_ONLY); |
| 772 | DeactivateIncrementalWriteBarrier(); |
| 773 | ASSERT(marking_deque_.IsEmpty()); |
| 774 | heap_->isolate()->stack_guard()->Continue(GC_REQUEST); |
| 775 | } |
| 776 | |
| 777 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 778 | void IncrementalMarking::MarkingComplete(CompletionAction action) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 779 | state_ = COMPLETE; |
| 780 | // We will set the stack guard to request a GC now. This will mean the rest |
| 781 | // of the GC gets performed as soon as possible (we can't do a GC here in a |
| 782 | // record-write context). If a few things get allocated between now and then |
| 783 | // that shouldn't make us do a scavenge and keep being incremental, so we set |
| 784 | // the should-hurry flag to indicate that there can't be much work left to do. |
| 785 | set_should_hurry(true); |
| 786 | if (FLAG_trace_incremental_marking) { |
| 787 | PrintF("[IncrementalMarking] Complete (normal).\n"); |
| 788 | } |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 789 | if (action == GC_VIA_STACK_GUARD) { |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 790 | heap_->isolate()->stack_guard()->RequestGC(); |
| 791 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 795 | void IncrementalMarking::Step(intptr_t allocated_bytes, |
| 796 | CompletionAction action) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 797 | if (heap_->gc_state() != Heap::NOT_IN_GC || |
| 798 | !FLAG_incremental_marking || |
| 799 | !FLAG_incremental_marking_steps || |
| 800 | (state_ != SWEEPING && state_ != MARKING)) { |
| 801 | return; |
| 802 | } |
| 803 | |
| 804 | allocated_ += allocated_bytes; |
| 805 | |
| 806 | if (allocated_ < kAllocatedThreshold) return; |
| 807 | |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 808 | if (state_ == MARKING && no_marking_scope_depth_ > 0) return; |
| 809 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 810 | intptr_t bytes_to_process = allocated_ * allocation_marking_factor_; |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 811 | bytes_scanned_ += bytes_to_process; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 812 | |
| 813 | double start = 0; |
| 814 | |
| 815 | if (FLAG_trace_incremental_marking || FLAG_trace_gc) { |
| 816 | start = OS::TimeCurrentMillis(); |
| 817 | } |
| 818 | |
| 819 | if (state_ == SWEEPING) { |
svenpanne@chromium.org | ecb9dd6 | 2011-12-01 08:22:35 +0000 | [diff] [blame] | 820 | if (heap_->AdvanceSweepers(static_cast<int>(bytes_to_process))) { |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 821 | bytes_scanned_ = 0; |
ricow@chromium.org | fa52deb | 2011-10-11 19:09:42 +0000 | [diff] [blame] | 822 | StartMarking(PREVENT_COMPACTION); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 823 | } |
| 824 | } else if (state_ == MARKING) { |
| 825 | Map* filler_map = heap_->one_pointer_filler_map(); |
| 826 | Map* global_context_map = heap_->global_context_map(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 827 | while (!marking_deque_.IsEmpty() && bytes_to_process > 0) { |
| 828 | HeapObject* obj = marking_deque_.Pop(); |
| 829 | |
| 830 | // Explicitly skip one word fillers. Incremental markbit patterns are |
| 831 | // correct only for objects that occupy at least two words. |
| 832 | Map* map = obj->map(); |
| 833 | if (map == filler_map) continue; |
| 834 | |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 835 | int size = obj->SizeFromMap(map); |
| 836 | bytes_to_process -= size; |
| 837 | MarkBit map_mark_bit = Marking::MarkBitFrom(map); |
| 838 | if (Marking::IsWhite(map_mark_bit)) { |
| 839 | WhiteToGreyAndPush(map, map_mark_bit); |
| 840 | } |
| 841 | |
| 842 | // TODO(gc) switch to static visitor instead of normal visitor. |
| 843 | if (map == global_context_map) { |
| 844 | // Global contexts have weak fields. |
| 845 | Context* ctx = Context::cast(obj); |
| 846 | |
| 847 | // We will mark cache black with a separate pass |
| 848 | // when we finish marking. |
| 849 | MarkObjectGreyDoNotEnqueue(ctx->normalized_map_cache()); |
| 850 | |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 851 | IncrementalMarkingMarkingVisitor::VisitGlobalContext(map, ctx); |
yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 852 | } else if (map->instance_type() == MAP_TYPE) { |
| 853 | Map* map = Map::cast(obj); |
| 854 | heap_->ClearCacheOnMap(map); |
| 855 | |
| 856 | // When map collection is enabled we have to mark through map's |
| 857 | // transitions and back pointers in a special way to make these links |
| 858 | // weak. Only maps for subclasses of JSReceiver can have transitions. |
| 859 | STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE); |
| 860 | if (FLAG_collect_maps && |
| 861 | map->instance_type() >= FIRST_JS_RECEIVER_TYPE) { |
| 862 | marker_.MarkMapContents(map); |
| 863 | } else { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 864 | IncrementalMarkingMarkingVisitor::VisitPointers( |
| 865 | heap_, |
yangguo@chromium.org | 5f0b8ea | 2012-05-16 12:37:04 +0000 | [diff] [blame] | 866 | HeapObject::RawField(map, Map::kPointerFieldsBeginOffset), |
| 867 | HeapObject::RawField(map, Map::kPointerFieldsEndOffset)); |
| 868 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 869 | } else { |
verwaest@chromium.org | b6d052d | 2012-07-27 08:03:27 +0000 | [diff] [blame^] | 870 | IncrementalMarkingMarkingVisitor::IterateBody(map, obj); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | MarkBit obj_mark_bit = Marking::MarkBitFrom(obj); |
erik.corry@gmail.com | 394dbcf | 2011-10-27 07:38:48 +0000 | [diff] [blame] | 874 | SLOW_ASSERT(Marking::IsGrey(obj_mark_bit) || |
| 875 | (obj->IsFiller() && Marking::IsWhite(obj_mark_bit))); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 876 | Marking::MarkBlack(obj_mark_bit); |
ulan@chromium.org | 2efb900 | 2012-01-19 15:36:35 +0000 | [diff] [blame] | 877 | MemoryChunk::IncrementLiveBytesFromGC(obj->address(), size); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 878 | } |
fschneider@chromium.org | 7d10be5 | 2012-04-10 12:30:14 +0000 | [diff] [blame] | 879 | if (marking_deque_.IsEmpty()) MarkingComplete(action); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | allocated_ = 0; |
| 883 | |
| 884 | steps_count_++; |
| 885 | steps_count_since_last_gc_++; |
| 886 | |
| 887 | bool speed_up = false; |
| 888 | |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 889 | if ((steps_count_ % kAllocationMarkingFactorSpeedupInterval) == 0) { |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 890 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 891 | PrintPID("Speed up marking after %d steps\n", |
| 892 | static_cast<int>(kAllocationMarkingFactorSpeedupInterval)); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 893 | } |
| 894 | speed_up = true; |
| 895 | } |
| 896 | |
| 897 | bool space_left_is_very_small = |
| 898 | (old_generation_space_available_at_start_of_incremental_ < 10 * MB); |
| 899 | |
| 900 | bool only_1_nth_of_space_that_was_available_still_left = |
| 901 | (SpaceLeftInOldSpace() * (allocation_marking_factor_ + 1) < |
| 902 | old_generation_space_available_at_start_of_incremental_); |
| 903 | |
| 904 | if (space_left_is_very_small || |
| 905 | only_1_nth_of_space_that_was_available_still_left) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 906 | if (FLAG_trace_gc) PrintPID("Speed up marking because of low space left\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 907 | speed_up = true; |
| 908 | } |
| 909 | |
| 910 | bool size_of_old_space_multiplied_by_n_during_marking = |
| 911 | (heap_->PromotedTotalSize() > |
| 912 | (allocation_marking_factor_ + 1) * |
| 913 | old_generation_space_used_at_start_of_incremental_); |
| 914 | if (size_of_old_space_multiplied_by_n_during_marking) { |
| 915 | speed_up = true; |
| 916 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 917 | PrintPID("Speed up marking because of heap size increase\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 918 | } |
| 919 | } |
| 920 | |
| 921 | int64_t promoted_during_marking = heap_->PromotedTotalSize() |
| 922 | - old_generation_space_used_at_start_of_incremental_; |
| 923 | intptr_t delay = allocation_marking_factor_ * MB; |
| 924 | intptr_t scavenge_slack = heap_->MaxSemiSpaceSize(); |
| 925 | |
| 926 | // We try to scan at at least twice the speed that we are allocating. |
| 927 | if (promoted_during_marking > bytes_scanned_ / 2 + scavenge_slack + delay) { |
| 928 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 929 | PrintPID("Speed up marking because marker was not keeping up\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 930 | } |
| 931 | speed_up = true; |
| 932 | } |
| 933 | |
| 934 | if (speed_up) { |
| 935 | if (state_ != MARKING) { |
| 936 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 937 | PrintPID("Postponing speeding up marking until marking starts\n"); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 938 | } |
| 939 | } else { |
| 940 | allocation_marking_factor_ += kAllocationMarkingFactorSpeedup; |
| 941 | allocation_marking_factor_ = static_cast<int>( |
| 942 | Min(kMaxAllocationMarkingFactor, |
| 943 | static_cast<intptr_t>(allocation_marking_factor_ * 1.3))); |
| 944 | if (FLAG_trace_gc) { |
rossberg@chromium.org | 657d53b | 2012-07-12 11:06:03 +0000 | [diff] [blame] | 945 | PrintPID("Marking speed increased to %d\n", allocation_marking_factor_); |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 946 | } |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 947 | } |
| 948 | } |
| 949 | |
| 950 | if (FLAG_trace_incremental_marking || FLAG_trace_gc) { |
| 951 | double end = OS::TimeCurrentMillis(); |
| 952 | double delta = (end - start); |
| 953 | longest_step_ = Max(longest_step_, delta); |
| 954 | steps_took_ += delta; |
| 955 | steps_took_since_last_gc_ += delta; |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | |
| 960 | void IncrementalMarking::ResetStepCounters() { |
| 961 | steps_count_ = 0; |
| 962 | steps_took_ = 0; |
| 963 | longest_step_ = 0.0; |
| 964 | old_generation_space_available_at_start_of_incremental_ = |
| 965 | SpaceLeftInOldSpace(); |
| 966 | old_generation_space_used_at_start_of_incremental_ = |
| 967 | heap_->PromotedTotalSize(); |
| 968 | steps_count_since_last_gc_ = 0; |
| 969 | steps_took_since_last_gc_ = 0; |
| 970 | bytes_rescanned_ = 0; |
| 971 | allocation_marking_factor_ = kInitialAllocationMarkingFactor; |
danno@chromium.org | c612e02 | 2011-11-10 11:38:15 +0000 | [diff] [blame] | 972 | bytes_scanned_ = 0; |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | |
| 976 | int64_t IncrementalMarking::SpaceLeftInOldSpace() { |
jkummerow@chromium.org | 212d964 | 2012-05-11 15:02:09 +0000 | [diff] [blame] | 977 | return heap_->MaxOldGenerationSize() - heap_->PromotedSpaceSizeOfObjects(); |
erik.corry@gmail.com | c3b670f | 2011-10-05 21:44:48 +0000 | [diff] [blame] | 978 | } |
| 979 | |
| 980 | } } // namespace v8::internal |