chromium/base/allocator/partition_allocator/src/partition_alloc/pointers/raw_ptr_backup_ref_impl.h

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef PARTITION_ALLOC_POINTERS_RAW_PTR_BACKUP_REF_IMPL_H_
#define PARTITION_ALLOC_POINTERS_RAW_PTR_BACKUP_REF_IMPL_H_

#include <cstddef>
#include <type_traits>

#include "partition_alloc/build_config.h"
#include "partition_alloc/buildflags.h"
#include "partition_alloc/partition_address_space.h"
#include "partition_alloc/partition_alloc_base/compiler_specific.h"
#include "partition_alloc/partition_alloc_base/component_export.h"
#include "partition_alloc/partition_alloc_base/cxx20_is_constant_evaluated.h"
#include "partition_alloc/partition_alloc_config.h"
#include "partition_alloc/partition_alloc_constants.h"
#include "partition_alloc/partition_alloc_forward.h"
#include "partition_alloc/pointers/instance_tracer.h"
#include "partition_alloc/tagging.h"

#if !PA_BUILDFLAG(HAS_64_BIT_POINTERS)
#include "partition_alloc/address_pool_manager_bitmap.h"
#endif

#if !PA_BUILDFLAG(USE_RAW_PTR_BACKUP_REF_IMPL)
#error "Included under wrong build option"
#endif

namespace base::internal {

#if PA_BUILDFLAG(DCHECKS_ARE_ON) || \
    PA_BUILDFLAG(ENABLE_BACKUP_REF_PTR_SLOW_CHECKS)
PA_COMPONENT_EXPORT(RAW_PTR)
void CheckThatAddressIsntWithinFirstPartitionPage(uintptr_t address);
#endif

// Note that `RawPtrBackupRefImpl` itself is not thread-safe. If multiple
// threads modify the same raw_ptr object without synchronization, a data race
// will occur.
template <bool AllowDangling = false, bool DisableBRP = false>
struct RawPtrBackupRefImpl { … };

}  // namespace base::internal

#endif  // PARTITION_ALLOC_POINTERS_RAW_PTR_BACKUP_REF_IMPL_H_