1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
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.
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
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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.
28 #ifndef V8_INCREMENTAL_MARKING_INL_H_
29 #define V8_INCREMENTAL_MARKING_INL_H_
31 #include "incremental-marking.h"
37 bool IncrementalMarking::BaseRecordWrite(HeapObject* obj,
40 HeapObject* value_heap_obj = HeapObject::cast(value);
41 MarkBit value_bit = Marking::MarkBitFrom(value_heap_obj);
42 if (Marking::IsWhite(value_bit)) {
43 MarkBit obj_bit = Marking::MarkBitFrom(obj);
44 if (Marking::IsBlack(obj_bit)) {
45 MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
46 if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) {
47 if (chunk->IsLeftOfProgressBar(slot)) {
48 WhiteToGreyAndPush(value_heap_obj, value_bit);
49 RestartIfNotMarking();
54 BlackToGreyAndUnshift(obj, obj_bit);
55 RestartIfNotMarking();
62 if (!is_compacting_) return false;
63 MarkBit obj_bit = Marking::MarkBitFrom(obj);
64 return Marking::IsBlack(obj_bit);
68 void IncrementalMarking::RecordWrite(HeapObject* obj,
71 if (IsMarking() && value->NonFailureIsHeapObject()) {
72 RecordWriteSlow(obj, slot, value);
77 void IncrementalMarking::RecordWriteOfCodeEntry(JSFunction* host,
80 if (IsMarking()) RecordWriteOfCodeEntrySlow(host, slot, value);
84 void IncrementalMarking::RecordWriteIntoCode(HeapObject* obj,
87 if (IsMarking() && value->NonFailureIsHeapObject()) {
88 RecordWriteIntoCodeSlow(obj, rinfo, value);
93 void IncrementalMarking::RecordWrites(HeapObject* obj) {
95 MarkBit obj_bit = Marking::MarkBitFrom(obj);
96 if (Marking::IsBlack(obj_bit)) {
97 MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
98 if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) {
99 chunk->set_progress_bar(0);
101 BlackToGreyAndUnshift(obj, obj_bit);
102 RestartIfNotMarking();
108 void IncrementalMarking::BlackToGreyAndUnshift(HeapObject* obj,
110 ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
111 ASSERT(obj->Size() >= 2*kPointerSize);
113 Marking::BlackToGrey(mark_bit);
114 int obj_size = obj->Size();
115 MemoryChunk::IncrementLiveBytesFromGC(obj->address(), -obj_size);
116 bytes_scanned_ -= obj_size;
117 int64_t old_bytes_rescanned = bytes_rescanned_;
118 bytes_rescanned_ = old_bytes_rescanned + obj_size;
119 if ((bytes_rescanned_ >> 20) != (old_bytes_rescanned >> 20)) {
120 if (bytes_rescanned_ > 2 * heap_->PromotedSpaceSizeOfObjects()) {
121 // If we have queued twice the heap size for rescanning then we are
122 // going around in circles, scanning the same objects again and again
123 // as the program mutates the heap faster than we can incrementally
124 // trace it. In this case we switch to non-incremental marking in
125 // order to finish off this marking phase.
127 PrintPID("Hurrying incremental marking because of lack of progress\n");
129 marking_speed_ = kMaxMarkingSpeed;
133 marking_deque_.UnshiftGrey(obj);
137 void IncrementalMarking::WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit) {
138 Marking::WhiteToGrey(mark_bit);
139 marking_deque_.PushGrey(obj);
143 } } // namespace v8::internal
145 #endif // V8_INCREMENTAL_MARKING_INL_H_