| // 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_PAGE_ALLOCATOR_CONSTANTS_H_ |
| #define THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PAGE_ALLOCATOR_CONSTANTS_H_ |
| |
| #include <stddef.h> |
| |
| #include "build/build_config.h" |
| |
| namespace pdfium { |
| namespace base { |
| #if defined(OS_WIN) |
| static constexpr size_t kPageAllocationGranularityShift = 16; // 64KB |
| #elif defined(_MIPS_ARCH_LOONGSON) |
| static constexpr size_t kPageAllocationGranularityShift = 14; // 16KB |
| #else |
| static constexpr size_t kPageAllocationGranularityShift = 12; // 4KB |
| #endif |
| static constexpr size_t kPageAllocationGranularity = |
| 1 << kPageAllocationGranularityShift; |
| static constexpr size_t kPageAllocationGranularityOffsetMask = |
| kPageAllocationGranularity - 1; |
| static constexpr size_t kPageAllocationGranularityBaseMask = |
| ~kPageAllocationGranularityOffsetMask; |
| |
| #if defined(_MIPS_ARCH_LOONGSON) |
| static constexpr size_t kSystemPageSize = 16384; |
| #else |
| static constexpr size_t kSystemPageSize = 4096; |
| #endif |
| static constexpr size_t kSystemPageOffsetMask = kSystemPageSize - 1; |
| static_assert((kSystemPageSize & (kSystemPageSize - 1)) == 0, |
| "kSystemPageSize must be power of 2"); |
| static constexpr size_t kSystemPageBaseMask = ~kSystemPageOffsetMask; |
| |
| static constexpr size_t kPageMetadataShift = 5; // 32 bytes per partition page. |
| static constexpr size_t kPageMetadataSize = 1 << kPageMetadataShift; |
| |
| } // namespace base |
| } // namespace pdfium |
| |
| #endif // THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PAGE_ALLOCATOR_CONSTANTS_H_ |