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// Copyright (c) 2018 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.
#ifndef THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_DIRECT_MAP_EXTENT_H_
#define THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_DIRECT_MAP_EXTENT_H_
#include "third_party/base/allocator/partition_allocator/partition_bucket.h"
#include "third_party/base/allocator/partition_allocator/partition_page.h"
namespace pdfium {
namespace base {
namespace internal {
struct PartitionDirectMapExtent {
PartitionDirectMapExtent* next_extent;
PartitionDirectMapExtent* prev_extent;
PartitionBucket* bucket;
size_t map_size; // Mapped size, not including guard pages and meta-data.
ALWAYS_INLINE static PartitionDirectMapExtent* FromPage(PartitionPage* page);
};
ALWAYS_INLINE PartitionDirectMapExtent* PartitionDirectMapExtent::FromPage(
PartitionPage* page) {
DCHECK(page->bucket->is_direct_mapped());
return reinterpret_cast<PartitionDirectMapExtent*>(
reinterpret_cast<char*>(page) + 3 * kPageMetadataSize);
}
} // namespace internal
} // namespace base
} // namespace pdfium
#endif // THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_DIRECT_MAP_EXTENT_H_
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