mutable-page-metadata-inl.h

Go to the documentation of this file.

// 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.
 
#ifndef V8_HEAP_MUTABLE_PAGE_METADATA_INL_H_
#define V8_HEAP_MUTABLE_PAGE_METADATA_INL_H_
 
#include "src/heap/mutable-page-metadata.h"
// Include the non-inl header before the rest of the headers.
 
#include "src/heap/memory-chunk-metadata-inl.h"
#include "src/heap/spaces-inl.h"
 
namespace v8 {
namespace internal {
 
// static
MutablePageMetadata* MutablePageMetadata::FromAddress(Address a) {
  return cast(MemoryChunkMetadata::FromAddress(a));
}
 
// static
MutablePageMetadata* MutablePageMetadata::FromHeapObject(Tagged<HeapObject> o) {
  return cast(MemoryChunkMetadata::FromHeapObject(o));
}
 
void MutablePageMetadata::IncrementExternalBackingStoreBytes(
    ExternalBackingStoreType type, size_t amount) {
  base::CheckedIncrement(&external_backing_store_bytes_[static_cast<int>(type)],
                         amount);
  owner()->IncrementExternalBackingStoreBytes(type, amount);
}
 
void MutablePageMetadata::DecrementExternalBackingStoreBytes(
    ExternalBackingStoreType type, size_t amount) {
  base::CheckedDecrement(&external_backing_store_bytes_[static_cast<int>(type)],
                         amount);
  owner()->DecrementExternalBackingStoreBytes(type, amount);
}
 
void MutablePageMetadata::MoveExternalBackingStoreBytes(
    ExternalBackingStoreType type, MutablePageMetadata* from,
    MutablePageMetadata* to, size_t amount) {
  DCHECK_NOT_NULL(from->owner());
  DCHECK_NOT_NULL(to->owner());
  base::CheckedDecrement(
      &(from->external_backing_store_bytes_[static_cast<int>(type)]), amount);
  base::CheckedIncrement(
      &(to->external_backing_store_bytes_[static_cast<int>(type)]), amount);
  Space::MoveExternalBackingStoreBytes(type, from->owner(), to->owner(),
                                       amount);
}
 
AllocationSpace MutablePageMetadata::owner_identity() const {
  DCHECK_EQ(owner() == nullptr, Chunk()->InReadOnlySpace());
  if (!owner()) return RO_SPACE;
  return owner()->identity();
}
 
void MutablePageMetadata::SetOldGenerationPageFlags(MarkingMode marking_mode) {
  return Chunk()->SetOldGenerationPageFlags(marking_mode, owner_identity());
}
 
template <AccessMode mode>
void MutablePageMetadata::ClearLiveness() {
  marking_bitmap()->Clear<mode>();
  SetLiveBytes(0);
}
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_HEAP_MUTABLE_PAGE_METADATA_INL_H_