22f80fc176
This adds the following: 1) Heap object structure classes: RawHeap, BaseArena and BasePage. - freelist - linear allocation block 2) ObjectAllocator, a class responsible for object (and page) allocation. The design doc with UML design: https://bit.ly/2VVTcqc User defined arenas are followup. Bug: chromium:1056170 Change-Id: I69a82974bd08e3cf3da90041b1628297cc890891 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2167392 Commit-Queue: Anton Bikineev <bikineev@chromium.org> Reviewed-by: Omer Katz <omerkatz@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#67425}
45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
// Copyright 2020 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef INCLUDE_CPPGC_INTERNAL_API_CONSTANTS_H_
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#define INCLUDE_CPPGC_INTERNAL_API_CONSTANTS_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "v8config.h" // NOLINT(build/include_directory)
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namespace cppgc {
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namespace internal {
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// Embedders should not rely on this code!
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// Internal constants to avoid exposing internal types on the API surface.
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namespace api_constants {
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// Offset of the uint16_t bitfield from the payload contaning the
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// in-construction bit. This is subtracted from the payload pointer to get
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// to the right bitfield.
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static constexpr size_t kFullyConstructedBitFieldOffsetFromPayload =
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2 * sizeof(uint16_t);
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// Mask for in-construction bit.
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static constexpr size_t kFullyConstructedBitMask = size_t{1};
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// Page constants used to align pointers to page begin.
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static constexpr size_t kPageSize = size_t{1} << 17;
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static constexpr size_t kPageAlignment = kPageSize;
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static constexpr size_t kPageBaseMask = ~(kPageAlignment - 1);
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static constexpr size_t kGuardPageSize = 4096;
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// Offset of the Heap backref.
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static constexpr size_t kHeapOffset = 0;
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static constexpr size_t kLargeObjectSizeThreshold = kPageSize / 2;
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} // namespace api_constants
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} // namespace internal
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} // namespace cppgc
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#endif // INCLUDE_CPPGC_INTERNAL_API_CONSTANTS_H_
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