Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #ifndef V8_HEAP_INCREMENTAL_MARKING_INL_H_ |
| 6 | #define V8_HEAP_INCREMENTAL_MARKING_INL_H_ |
| 7 | |
| 8 | #include "src/heap/incremental-marking.h" |
| 9 | |
| 10 | namespace v8 { |
| 11 | namespace internal { |
| 12 | |
| 13 | |
| 14 | bool IncrementalMarking::BaseRecordWrite(HeapObject* obj, Object** slot, |
| 15 | Object* value) { |
| 16 | HeapObject* value_heap_obj = HeapObject::cast(value); |
| 17 | MarkBit value_bit = Marking::MarkBitFrom(value_heap_obj); |
| 18 | if (Marking::IsWhite(value_bit)) { |
| 19 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 20 | if (Marking::IsBlack(obj_bit)) { |
| 21 | MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); |
| 22 | if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) { |
| 23 | if (chunk->IsLeftOfProgressBar(slot)) { |
| 24 | WhiteToGreyAndPush(value_heap_obj, value_bit); |
| 25 | RestartIfNotMarking(); |
| 26 | } else { |
| 27 | return false; |
| 28 | } |
| 29 | } else { |
| 30 | BlackToGreyAndUnshift(obj, obj_bit); |
| 31 | RestartIfNotMarking(); |
| 32 | return false; |
| 33 | } |
| 34 | } else { |
| 35 | return false; |
| 36 | } |
| 37 | } |
| 38 | if (!is_compacting_) return false; |
| 39 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 40 | return Marking::IsBlack(obj_bit); |
| 41 | } |
| 42 | |
| 43 | |
| 44 | void IncrementalMarking::RecordWrite(HeapObject* obj, Object** slot, |
| 45 | Object* value) { |
| 46 | if (IsMarking() && value->IsHeapObject()) { |
| 47 | RecordWriteSlow(obj, slot, value); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | |
| 52 | void IncrementalMarking::RecordWriteOfCodeEntry(JSFunction* host, Object** slot, |
| 53 | Code* value) { |
| 54 | if (IsMarking()) RecordWriteOfCodeEntrySlow(host, slot, value); |
| 55 | } |
| 56 | |
| 57 | |
| 58 | void IncrementalMarking::RecordWriteIntoCode(HeapObject* obj, RelocInfo* rinfo, |
| 59 | Object* value) { |
| 60 | if (IsMarking() && value->IsHeapObject()) { |
| 61 | RecordWriteIntoCodeSlow(obj, rinfo, value); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | |
| 66 | void IncrementalMarking::RecordWrites(HeapObject* obj) { |
| 67 | if (IsMarking()) { |
| 68 | MarkBit obj_bit = Marking::MarkBitFrom(obj); |
| 69 | if (Marking::IsBlack(obj_bit)) { |
| 70 | MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address()); |
| 71 | if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) { |
| 72 | chunk->set_progress_bar(0); |
| 73 | } |
| 74 | BlackToGreyAndUnshift(obj, obj_bit); |
| 75 | RestartIfNotMarking(); |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | |
| 81 | void IncrementalMarking::BlackToGreyAndUnshift(HeapObject* obj, |
| 82 | MarkBit mark_bit) { |
| 83 | DCHECK(Marking::MarkBitFrom(obj) == mark_bit); |
| 84 | DCHECK(obj->Size() >= 2 * kPointerSize); |
| 85 | DCHECK(IsMarking()); |
| 86 | Marking::BlackToGrey(mark_bit); |
| 87 | int obj_size = obj->Size(); |
| 88 | MemoryChunk::IncrementLiveBytesFromGC(obj->address(), -obj_size); |
| 89 | bytes_scanned_ -= obj_size; |
| 90 | int64_t old_bytes_rescanned = bytes_rescanned_; |
| 91 | bytes_rescanned_ = old_bytes_rescanned + obj_size; |
| 92 | if ((bytes_rescanned_ >> 20) != (old_bytes_rescanned >> 20)) { |
| 93 | if (bytes_rescanned_ > 2 * heap_->PromotedSpaceSizeOfObjects()) { |
| 94 | // If we have queued twice the heap size for rescanning then we are |
| 95 | // going around in circles, scanning the same objects again and again |
| 96 | // as the program mutates the heap faster than we can incrementally |
| 97 | // trace it. In this case we switch to non-incremental marking in |
| 98 | // order to finish off this marking phase. |
| 99 | if (FLAG_trace_gc) { |
| 100 | PrintPID("Hurrying incremental marking because of lack of progress\n"); |
| 101 | } |
| 102 | marking_speed_ = kMaxMarkingSpeed; |
| 103 | } |
| 104 | } |
| 105 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 106 | heap_->mark_compact_collector()->marking_deque()->UnshiftGrey(obj); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | |
| 110 | void IncrementalMarking::WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit) { |
| 111 | Marking::WhiteToGrey(mark_bit); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 112 | heap_->mark_compact_collector()->marking_deque()->PushGrey(obj); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 113 | } |
| 114 | } |
| 115 | } // namespace v8::internal |
| 116 | |
| 117 | #endif // V8_HEAP_INCREMENTAL_MARKING_INL_H_ |