diff options
Diffstat (limited to 'third_party/base/allocator/partition_allocator/page_allocator_constants.h')
| -rw-r--r-- | third_party/base/allocator/partition_allocator/page_allocator_constants.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/third_party/base/allocator/partition_allocator/page_allocator_constants.h b/third_party/base/allocator/partition_allocator/page_allocator_constants.h new file mode 100644 index 0000000000..945273b1f2 --- /dev/null +++ b/third_party/base/allocator/partition_allocator/page_allocator_constants.h @@ -0,0 +1,44 @@ +// 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_ |