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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/memory/raw_ptr.h"
#include "base/allocator/buildflags.h"
// USE_BACKUP_REF_PTR implies USE_PARTITION_ALLOC, needed for code under
// allocator/partition_allocator/ to be built.
#if BUILDFLAG(USE_BACKUP_REF_PTR)
#include "base/allocator/partition_allocator/partition_alloc.h"
#include "base/allocator/partition_allocator/partition_ref_count.h"
#include "base/allocator/partition_allocator/partition_root.h"
#include "base/allocator/partition_allocator/reservation_offset_table.h"
#include "base/check.h"
#include "base/dcheck_is_on.h"
namespace base {
namespace internal {
void BackupRefPtrImpl::AcquireInternal(void* ptr) {
#if DCHECK_IS_ON() || BUILDFLAG(ENABLE_BACKUP_REF_PTR_SLOW_CHECKS)
CHECK(IsManagedByPartitionAllocBRPPool(ptr));
#endif
void* slot_start = PartitionAllocGetSlotStart(ptr);
PartitionRefCountPointer(slot_start)->Acquire();
}
void BackupRefPtrImpl::ReleaseInternal(void* ptr) {
#if DCHECK_IS_ON() || BUILDFLAG(ENABLE_BACKUP_REF_PTR_SLOW_CHECKS)
CHECK(IsManagedByPartitionAllocBRPPool(ptr));
#endif
void* slot_start = PartitionAllocGetSlotStart(ptr);
if (PartitionRefCountPointer(slot_start)->Release())
PartitionAllocFreeForRefCounting(slot_start);
}
bool BackupRefPtrImpl::IsPointeeAlive(void* ptr) {
#if DCHECK_IS_ON() || BUILDFLAG(ENABLE_BACKUP_REF_PTR_SLOW_CHECKS)
CHECK(IsManagedByPartitionAllocBRPPool(ptr));
#endif
void* slot_start = PartitionAllocGetSlotStart(ptr);
return PartitionRefCountPointer(slot_start)->IsAlive();
}
bool BackupRefPtrImpl::IsValidDelta(void* ptr, ptrdiff_t delta) {
return PartitionAllocIsValidPtrDelta(ptr, delta);
}
#if DCHECK_IS_ON() || BUILDFLAG(ENABLE_BACKUP_REF_PTR_SLOW_CHECKS)
void CheckThatAddressIsntWithinFirstPartitionPage(void* ptr) {
if (IsManagedByDirectMap(ptr)) {
uintptr_t reservation_start = GetDirectMapReservationStart(ptr);
CHECK(reinterpret_cast<uintptr_t>(ptr) - reservation_start >=
PartitionPageSize());
} else {
CHECK(IsManagedByNormalBuckets(ptr));
CHECK(reinterpret_cast<uintptr_t>(ptr) % kSuperPageSize >=
PartitionPageSize());
}
}
#endif // DCHECK_IS_ON() || BUILDFLAG(ENABLE_BACKUP_REF_PTR_SLOW_CHECKS)
} // namespace internal
} // namespace base
#endif // BUILDFLAG(USE_BACKUP_REF_PTR)
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