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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_INCREMENTAL_MARKING_INL_H_
#define V8_INCREMENTAL_MARKING_INL_H_
#include "incremental-marking.h"
namespace v8 {
namespace internal {
bool IncrementalMarking::BaseRecordWrite(HeapObject* obj,
Object** slot,
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;
}
}
if (!is_compacting_) return false;
MarkBit obj_bit = Marking::MarkBitFrom(obj);
return Marking::IsBlack(obj_bit);
}
void IncrementalMarking::RecordWrite(HeapObject* obj,
Object** slot,
Object* value) {
if (IsMarking() && value->IsHeapObject()) {
RecordWriteSlow(obj, slot, value);
}
}
void IncrementalMarking::RecordWriteOfCodeEntry(JSFunction* host,
Object** slot,
Code* value) {
if (IsMarking()) RecordWriteOfCodeEntrySlow(host, slot, value);
}
void IncrementalMarking::RecordWriteIntoCode(HeapObject* obj,
RelocInfo* rinfo,
Object* value) {
if (IsMarking() && value->IsHeapObject()) {
RecordWriteIntoCodeSlow(obj, rinfo, value);
}
}
void IncrementalMarking::RecordWrites(HeapObject* obj) {
if (IsMarking()) {
MarkBit obj_bit = Marking::MarkBitFrom(obj);
if (Marking::IsBlack(obj_bit)) {
MemoryChunk* chunk = MemoryChunk::FromAddress(obj->address());
if (chunk->IsFlagSet(MemoryChunk::HAS_PROGRESS_BAR)) {
chunk->set_progress_bar(0);
}
BlackToGreyAndUnshift(obj, obj_bit);
RestartIfNotMarking();
}
}
}
void IncrementalMarking::BlackToGreyAndUnshift(HeapObject* obj,
MarkBit mark_bit) {
ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
ASSERT(obj->Size() >= 2*kPointerSize);
ASSERT(IsMarking());
Marking::BlackToGrey(mark_bit);
int obj_size = obj->Size();
MemoryChunk::IncrementLiveBytesFromGC(obj->address(), -obj_size);
bytes_scanned_ -= obj_size;
int64_t old_bytes_rescanned = bytes_rescanned_;
bytes_rescanned_ = old_bytes_rescanned + obj_size;
if ((bytes_rescanned_ >> 20) != (old_bytes_rescanned >> 20)) {
if (bytes_rescanned_ > 2 * heap_->PromotedSpaceSizeOfObjects()) {
// If we have queued twice the heap size for rescanning then we are
// going around in circles, scanning the same objects again and again
// as the program mutates the heap faster than we can incrementally
// trace it. In this case we switch to non-incremental marking in
// order to finish off this marking phase.
if (FLAG_trace_gc) {
PrintPID("Hurrying incremental marking because of lack of progress\n");
}
marking_speed_ = kMaxMarkingSpeed;
}
}
marking_deque_.UnshiftGrey(obj);
}
void IncrementalMarking::WhiteToGreyAndPush(HeapObject* obj, MarkBit mark_bit) {
Marking::WhiteToGrey(mark_bit);
marking_deque_.PushGrey(obj);
}
} } // namespace v8::internal
#endif // V8_INCREMENTAL_MARKING_INL_H_
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