5785d98b4b
This adds the following things: - age table for 4K regions; - generational barrier for mixed 4K regions; - unmarking for major collections; - young generation flags. Bug: chromium:1029379 Change-Id: Ief1229f0dac5f90c5f06d3168c8ffb4b7d1f1b53 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2246566 Commit-Queue: Anton Bikineev <bikineev@chromium.org> Reviewed-by: Omer Katz <omerkatz@chromium.org> Reviewed-by: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#68379}
68 lines
1.8 KiB
C++
68 lines
1.8 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_CAGED_HEAP_LOCAL_DATA_H_
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#define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_
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#include <array>
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#include "cppgc/internal/api-constants.h"
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#include "cppgc/internal/logging.h"
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#include "cppgc/platform.h"
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namespace cppgc {
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namespace internal {
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class HeapBase;
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#if defined(CPPGC_YOUNG_GENERATION)
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// AgeTable contains entries that correspond to 4KB memory regions. Each entry
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// can be in one of three states: kOld, kYoung or kUnknown.
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class AgeTable final {
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static constexpr size_t kGranularityBits = 12; // 4KiB per byte.
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public:
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enum class Age : uint8_t { kOld, kYoung, kUnknown };
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static constexpr size_t kEntrySizeInBytes = 1 << kGranularityBits;
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Age& operator[](uintptr_t offset) { return table_[entry(offset)]; }
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Age operator[](uintptr_t offset) const { return table_[entry(offset)]; }
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void Reset(PageAllocator* allocator);
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private:
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static constexpr size_t kAgeTableSize =
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api_constants::kCagedHeapReservationSize >> kGranularityBits;
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size_t entry(uintptr_t offset) const {
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const size_t entry = offset >> kGranularityBits;
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CPPGC_DCHECK(table_.size() > entry);
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return entry;
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}
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std::array<Age, kAgeTableSize> table_;
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};
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static_assert(sizeof(AgeTable) == 1 * api_constants::kMB,
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"Size of AgeTable is 1MB");
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#endif // CPPGC_YOUNG_GENERATION
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struct CagedHeapLocalData final {
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explicit CagedHeapLocalData(HeapBase* heap_base) : heap_base(heap_base) {}
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bool is_marking_in_progress = false;
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HeapBase* heap_base = nullptr;
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#if defined(CPPGC_YOUNG_GENERATION)
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AgeTable age_table;
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#endif
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};
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} // namespace internal
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} // namespace cppgc
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#endif // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_
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