62159ea316
The CL is a prerequisite for the shared cage. Instead of storing state variables (is_incremental_marking_in_progress, is_young_generation_enabled) in the cage metadata, the CL moves them to HeapHandle. The HeapHandle pointer is now retrieved from page-headers. To make sure that the write-barrier code is better optimized, the HeapHandle definition is moved to internal/ headers. The part of BasePage that contains HeapBase (i.e. HeapHandle) pointer is also extracted and moved to the headers. Bug: v8:12231 Change-Id: I44bf65d99a621d9548e4250386cf87476ca186ac Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3689730 Commit-Queue: Anton Bikineev <bikineev@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/main@{#81005}
65 lines
1.9 KiB
C++
65 lines
1.9 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 <cstddef>
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#include <cstdint>
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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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constexpr size_t kKB = 1024;
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constexpr size_t kMB = kKB * 1024;
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constexpr size_t kGB = kMB * 1024;
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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 uint16_t kFullyConstructedBitMask = uint16_t{1};
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static constexpr size_t kPageSize = size_t{1} << 17;
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#if defined(V8_TARGET_ARCH_ARM64) && defined(V8_OS_MACOS)
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constexpr size_t kGuardPageSize = 0;
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#else
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constexpr size_t kGuardPageSize = 4096;
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#endif
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static constexpr size_t kLargeObjectSizeThreshold = kPageSize / 2;
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#if defined(CPPGC_CAGED_HEAP)
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constexpr size_t kCagedHeapReservationSize = static_cast<size_t>(4) * kGB;
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constexpr size_t kCagedHeapReservationAlignment = kCagedHeapReservationSize;
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constexpr size_t kCagedHeapNormalPageReservationSize =
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kCagedHeapReservationSize / 2;
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#endif
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static constexpr size_t kDefaultAlignment = sizeof(void*);
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// Maximum support alignment for a type as in `alignof(T)`.
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static constexpr size_t kMaxSupportedAlignment = 2 * kDefaultAlignment;
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// Granularity of heap allocations.
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constexpr size_t kAllocationGranularity = sizeof(void*);
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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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