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// 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_CUSTOM_SPACE_H_
#define INCLUDE_CPPGC_CUSTOM_SPACE_H_

#include <stddef.h>

namespace cppgc {

/**
 * Index identifying a custom space.
 */
struct CustomSpaceIndex {
  constexpr CustomSpaceIndex(size_t value) : value(value) {}  // NOLINT
  size_t value;
};

/**
 * Top-level base class for custom spaces. Users must inherit from CustomSpace
 * below.
 */
class CustomSpaceBase {
 public:
  virtual ~CustomSpaceBase() = default;
  virtual CustomSpaceIndex GetCustomSpaceIndex() const = 0;
  virtual bool IsCompactable() const = 0;
};

/**
 * Base class custom spaces should directly inherit from. The class inheriting
 * from `CustomSpace` must define `kSpaceIndex` as unique space index. These
 * indices need for form a sequence starting at 0.
 *
 * Example:
 * \code
 * class CustomSpace1 : public CustomSpace<CustomSpace1> {
 *  public:
 *   static constexpr CustomSpaceIndex kSpaceIndex = 0;
 * };
 * class CustomSpace2 : public CustomSpace<CustomSpace2> {
 *  public:
 *   static constexpr CustomSpaceIndex kSpaceIndex = 1;
 * };
 * \endcode
 */
template <typename ConcreteCustomSpace>
class CustomSpace : public CustomSpaceBase {
 public:
  /**
   * Compaction is only supported on spaces that manually manage slots
   * recording.
   */
  static constexpr bool kSupportsCompaction = false;

  CustomSpaceIndex GetCustomSpaceIndex() const final {
    return ConcreteCustomSpace::kSpaceIndex;
  }
  bool IsCompactable() const final {
    return ConcreteCustomSpace::kSupportsCompaction;
  }
};

/**
 * User-overridable trait that allows pinning types to custom spaces.
 */
template <typename T, typename = void>
struct SpaceTrait {
  using Space = void;
};

namespace internal {

template <typename CustomSpace>
struct IsAllocatedOnCompactableSpaceImpl {
  static constexpr bool value = CustomSpace::kSupportsCompaction;
};

template <>
struct IsAllocatedOnCompactableSpaceImpl<void> {
  // Non-custom spaces are by default not compactable.
  static constexpr bool value = false;
};

template <typename T>
struct IsAllocatedOnCompactableSpace {
 public:
  static constexpr bool value =
      IsAllocatedOnCompactableSpaceImpl<typename SpaceTrait<T>::Space>::value;
};

}  // namespace internal

}  // namespace cppgc

#endif  // INCLUDE_CPPGC_CUSTOM_SPACE_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_CUSTOM_SPACE_H_
	#define INCLUDE_CPPGC_CUSTOM_SPACE_H_

	#include <stddef.h>

	namespace cppgc {

	/**
	* Index identifying a custom space.
	*/
	struct CustomSpaceIndex {
	constexpr CustomSpaceIndex(size_t value) : value(value) {} // NOLINT
	size_t value;
	};

	/**
	* Top-level base class for custom spaces. Users must inherit from CustomSpace
	* below.
	*/
	class CustomSpaceBase {
	public:
	virtual ~CustomSpaceBase() = default;
	virtual CustomSpaceIndex GetCustomSpaceIndex() const = 0;
	virtual bool IsCompactable() const = 0;
	};

	/**
	* Base class custom spaces should directly inherit from. The class inheriting
	* from `CustomSpace` must define `kSpaceIndex` as unique space index. These
	* indices need for form a sequence starting at 0.
	*
	* Example:
	* \code
	* class CustomSpace1 : public CustomSpace<CustomSpace1> {
	* public:
	* static constexpr CustomSpaceIndex kSpaceIndex = 0;
	* };
	* class CustomSpace2 : public CustomSpace<CustomSpace2> {
	* public:
	* static constexpr CustomSpaceIndex kSpaceIndex = 1;
	* };
	* \endcode
	*/
	template <typename ConcreteCustomSpace>
	class CustomSpace : public CustomSpaceBase {
	public:
	/**
	* Compaction is only supported on spaces that manually manage slots
	* recording.
	*/
	static constexpr bool kSupportsCompaction = false;

	CustomSpaceIndex GetCustomSpaceIndex() const final {
	return ConcreteCustomSpace::kSpaceIndex;
	}
	bool IsCompactable() const final {
	return ConcreteCustomSpace::kSupportsCompaction;
	}
	};

	/**
	* User-overridable trait that allows pinning types to custom spaces.
	*/
	template <typename T, typename = void>
	struct SpaceTrait {
	using Space = void;
	};

	namespace internal {

	template <typename CustomSpace>
	struct IsAllocatedOnCompactableSpaceImpl {
	static constexpr bool value = CustomSpace::kSupportsCompaction;
	};

	template <>
	struct IsAllocatedOnCompactableSpaceImpl<void> {
	// Non-custom spaces are by default not compactable.
	static constexpr bool value = false;
	};

	template <typename T>
	struct IsAllocatedOnCompactableSpace {
	public:
	static constexpr bool value =
	IsAllocatedOnCompactableSpaceImpl<typename SpaceTrait<T>::Space>::value;
	};

	} // namespace internal

	} // namespace cppgc

	#endif // INCLUDE_CPPGC_CUSTOM_SPACE_H_