blob: 71feef826a860c463f3a0c698e0d20f9d51d6229 [file] [log] [blame]
// Copyright 2020 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.
#include "src/heap/incremental-marking-inl.h"
#include "src/heap/incremental-marking.h"
#include "src/heap/marking-barrier.h"
namespace v8 {
namespace internal {
bool MarkingBarrier::MarkValue(HeapObject host, HeapObject value) {
// Host may have an impossible markbit pattern if manual allocation folding
// is performed and host happens to be the last word of an allocated region.
// In that case host has only one markbit and the second markbit belongs to
// another object. We can detect that case by checking if value is a one word
// filler map.
DCHECK(!marking_state_.IsImpossible(host) ||
value == ReadOnlyRoots(heap_->isolate()).one_pointer_filler_map());
if (!V8_CONCURRENT_MARKING_BOOL && marking_state_.IsBlack(host)) {
// The value will be marked and the slot will be recorded when the marker
// visits the host object.
return false;
if (WhiteToGreyAndPush(value)) {
return true;
bool MarkingBarrier::WhiteToGreyAndPush(HeapObject obj) {
if (marking_state_.WhiteToGrey(obj)) {
return true;
return false;
} // namespace internal
} // namespace v8