Object* value) {
HeapObject* value_heap_obj = HeapObject::cast(value);
MarkBit value_bit = Marking::MarkBitFrom(value_heap_obj);
- if (Marking::IsWhite(value_bit)) {
- MarkBit obj_bit = Marking::MarkBitFrom(obj);
- if (Marking::IsBlack(obj_bit)) {
- MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
- if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) {
- if (chunk->IsLeftOfProgressBar(slot)) {
- WhiteToGreyAndPush(value_heap_obj, value_bit);
- RestartIfNotMarking();
- } else {
- return false;
- }
- } else {
- BlackToGreyAndUnshift(obj, obj_bit);
- RestartIfNotMarking();
- return false;
- }
- } else {
- return false;
- }
+ // Checking the obj marking state is not necessary, but reduces the marking
+ // load.
+ MarkBit obj_bit = Marking::MarkBitFrom(obj);
+ if (Marking::IsWhite(value_bit) && Marking::IsBlack(obj_bit)) {
+ WhiteToGreyAndPush(value_heap_obj, value_bit);
+ RestartIfNotMarking();
}
if (!is_compacting_) return false;
- MarkBit obj_bit = Marking::MarkBitFrom(obj);
return Marking::IsBlack(obj_bit);
}
}
}
- bool IsLeftOfProgressBar(Object** slot) {
- Address slot_address = reinterpret_cast<Address>(slot);
- DCHECK(slot_address > this->address());
- return (slot_address - (this->address() + kObjectStartOffset)) <
- progress_bar();
- }
-
static void IncrementLiveBytesFromGC(Address address, int by) {
MemoryChunk::FromAddress(address)->IncrementLiveBytes(by);
}