Globals_inc.h - mozsearch

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

// Largest sub-page size class, or zero if there are none

GLOBAL(size_t, gMaxSubPageClass,

       gPageSize / 2 >= kMinSubPageClass ? gPageSize / 2 : 0)

// Number of sub-page bins.

GLOBAL(uint8_t, gNumSubPageClasses, []() GLOBAL_CONSTEXPR -> uint8_t {

  if GLOBAL_CONSTEXPR (gMaxSubPageClass != 0) {

    return mozilla::FloorLog2(gMaxSubPageClass) - LOG2(kMinSubPageClass) + 1;

  return 0;

}())

GLOBAL(uint8_t, gPageSize2Pow, GLOBAL_LOG2(gPageSize))

GLOBAL(size_t, gPageSizeMask, gPageSize - 1)

// Number of pages in a chunk.

GLOBAL(size_t, gChunkNumPages, kChunkSize >> gPageSize2Pow)

// Number of pages necessary for a chunk header plus a guard page.

GLOBAL(size_t, gChunkHeaderNumPages,

       1 + (((sizeof(arena_chunk_t) +

              sizeof(arena_chunk_map_t) * gChunkNumPages + gPageSizeMask) &

             ~gPageSizeMask) >>

            gPageSize2Pow))

// One chunk, minus the header, minus a guard page

GLOBAL(size_t, gMaxLargeClass,

       kChunkSize - gPageSize - (gChunkHeaderNumPages << gPageSize2Pow))

// Various checks that regard configuration.

GLOBAL_ASSERT(1ULL << gPageSize2Pow == gPageSize,

              "Page size is not a power of two");

GLOBAL_ASSERT(kQuantum >= sizeof(void*));

GLOBAL_ASSERT(kQuantum <= kQuantumWide);

GLOBAL_ASSERT(!kNumQuantumWideClasses ||

              kQuantumWide <= (kMinSubPageClass - kMaxQuantumClass));

GLOBAL_ASSERT(kQuantumWide <= kMaxQuantumClass);

GLOBAL_ASSERT(gMaxSubPageClass >= kMinSubPageClass || gMaxSubPageClass == 0);

GLOBAL_ASSERT(gMaxLargeClass >= gMaxSubPageClass);

GLOBAL_ASSERT(kChunkSize >= gPageSize);

GLOBAL_ASSERT(kQuantum * 4 <= kChunkSize);