chromium/base/allocator/partition_allocator/src/partition_alloc/address_pool_manager.h

// Copyright 2020 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_ADDRESS_POOL_MANAGER_H_
#define PARTITION_ALLOC_ADDRESS_POOL_MANAGER_H_

#include <bitset>
#include <limits>

#include "partition_alloc/address_pool_manager_types.h"
#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/thread_annotations.h"
#include "partition_alloc/partition_alloc_check.h"
#include "partition_alloc/partition_alloc_constants.h"
#include "partition_alloc/partition_lock.h"
#include "partition_alloc/thread_isolation/alignment.h"
#include "partition_alloc/thread_isolation/thread_isolation.h"

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

namespace partition_alloc {

class AddressSpaceStatsDumper;
struct AddressSpaceStats;
struct PoolStats;

}  // namespace partition_alloc

namespace partition_alloc::internal {

// (64bit version)
// AddressPoolManager takes a reserved virtual address space and manages address
// space allocation.
//
// AddressPoolManager (currently) supports up to 4 pools. Each pool manages a
// contiguous reserved address space. Alloc() takes a pool_handle and returns
// address regions from the specified pool. Free() also takes a pool_handle and
// returns the address region back to the manager.
//
// (32bit version)
// AddressPoolManager wraps AllocPages and FreePages and remembers allocated
// address regions using bitmaps. IsManagedByPartitionAlloc*Pool use the bitmaps
// to judge whether a given address is in a pool that supports BackupRefPtr or
// in a pool that doesn't. All PartitionAlloc allocations must be in either of
// the pools.
class PA_COMPONENT_EXPORT(PARTITION_ALLOC)
    PA_THREAD_ISOLATED_ALIGN AddressPoolManager { … };

}  // namespace partition_alloc::internal

#endif  // PARTITION_ALLOC_ADDRESS_POOL_MANAGER_H_