| Server IP : 153.92.12.132 / Your IP : 216.73.217.6 Web Server : LiteSpeed System : Linux id-dci-web1986.main-hosting.eu 5.14.0-611.26.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Jan 29 05:24:47 EST 2026 x86_64 User : u686484674 ( 686484674) PHP Version : 8.0.30 Disable Function : system, exec, shell_exec, passthru, mysql_list_dbs, ini_alter, dl, symlink, link, chgrp, leak, popen, apache_child_terminate, virtual, mb_send_mail MySQL : OFF | cURL : ON | WGET : ON | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : /proc/self/root/opt/alt/alt-nodejs24/root/usr/include/node/cppgc/ |
Upload 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 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_