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Preview: custom-space.h Size: 2.40 KB

/opt/cpanel/ea-nodejs20/include/node/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_

Name	Size	Perms	Modified	Actions
internal DIR	-	drwxr-xr-x	2026-02-03 09:33:34	Edit Download recursive recursive
allocation.h	11.61 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
common.h	643 B	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
cross-thread-persistent.h	14.81 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
custom-space.h	2.40 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
default-platform.h	2.18 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
ephemeron-pair.h	804 B	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
explicit-management.h	3.29 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
garbage-collected.h	3.11 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
heap-consistency.h	11.74 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
heap-handle.h	1.26 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
heap-state.h	2.57 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
heap-statistics.h	3.89 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
heap.h	5.70 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
liveness-broker.h	2.34 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
macros.h	1.31 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
member.h	22.75 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
name-provider.h	1.99 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
object-size-trait.h	1.60 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
persistent.h	13.50 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
platform.h	5.56 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
prefinalizer.h	2.88 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
process-heap-statistics.h	1009 B	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
sentinel-pointer.h	935 B	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
source-location.h	2.57 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
testing.h	2.96 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
trace-trait.h	3.14 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
type-traits.h	7.78 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive
visitor.h	14.84 KB	lrw-r--r--	2026-01-16 18:04:27	Edit Download recursive recursive

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