src/objects/hole.h

// Copyright 2023 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_OBJECTS_HOLE_H_
#define V8_OBJECTS_HOLE_H_

#include "src/objects/heap-object.h"

// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

V8_OBJECT class Hole : public HeapObject {
  V8_IT_OWN_TYPE;
  V8_IT_NO_AUTO_DISPATCH;

 public:
  DECL_VERIFIER(Hole)
  DECL_PRINTER(Hole)

  class BodyDescriptor;

 private:
  friend class Heap;
  friend class Isolate;

  // TODO(leszeks): Make it smaller if able and needed.
  static constexpr int kPayloadSize = 64 * KB;
  // Payload should be a multiple of page size.
  static_assert(kPayloadSize % kMinimumOSPageSize == 0);

  char payload_[kPayloadSize];
} V8_OBJECT_END;

#define DEFINE_HOLE_TYPE(Name, name, Root) \
  V8_OBJECT class Name : public Hole {     \
    V8_IT_REUSE_PARENT;                    \
  } V8_OBJECT_END;

HOLE_LIST(DEFINE_HOLE_TYPE)
#undef DEFINE_HOLE_TYPE

}  // namespace internal
}  // namespace v8

#include "src/objects/object-macros-undef.h"

#endif  // V8_OBJECTS_HOLE_H_