chromium/v8/include/cppgc/internal/persistent-node.h

// 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 INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_
#define INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_

#include <array>
#include <memory>
#include <vector>

#include "cppgc/internal/logging.h"
#include "cppgc/trace-trait.h"
#include "v8config.h"  // NOLINT(build/include_directory)

namespace cppgc {
namespace internal {

class CrossThreadPersistentRegion;
class FatalOutOfMemoryHandler;
class RootVisitor;

// PersistentNode represents a variant of two states:
// 1) traceable node with a back pointer to the Persistent object;
// 2) freelist entry.
class PersistentNode final { … };

class V8_EXPORT PersistentRegionBase { … };

// Variant of PersistentRegionBase that checks whether the allocation and
// freeing happens only on the thread that created the region.
class V8_EXPORT PersistentRegion final : public PersistentRegionBase { … };

// CrossThreadPersistent uses PersistentRegionBase but protects it using this
// lock when needed.
class V8_EXPORT PersistentRegionLock final { … };

// Variant of PersistentRegionBase that checks whether the PersistentRegionLock
// is locked.
class V8_EXPORT CrossThreadPersistentRegion final
    : protected PersistentRegionBase { … };

}  // namespace internal

}  // namespace cppgc

#endif  // INCLUDE_CPPGC_INTERNAL_PERSISTENT_NODE_H_