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// Copyright 2020 the V8 project 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 INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_ #define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_ #include <array> #include <cstddef> #include <cstdint> #include "cppgc/internal/api-constants.h" #include "cppgc/internal/caged-heap.h" #include "cppgc/internal/logging.h" #include "cppgc/platform.h" #include "v8config.h" // NOLINT(build/include_directory) #if __cpp_lib_bitopts #include <bit> #endif // __cpp_lib_bitopts #if defined(CPPGC_CAGED_HEAP) namespace cppgc { namespace internal { class HeapBase; class HeapBaseHandle; #if defined(CPPGC_YOUNG_GENERATION) // AgeTable is the bytemap needed for the fast generation check in the write // barrier. AgeTable contains entries that correspond to 4096 bytes memory // regions (cards). Each entry in the table represents generation of the objects // that reside on the corresponding card (young, old or mixed). class V8_EXPORT AgeTable final { static constexpr size_t kRequiredSize = 1 * api_constants::kMB; static constexpr size_t kAllocationGranularity = api_constants::kAllocationGranularity; public: // Represents age of the objects living on a single card. enum class Age : uint8_t { kOld, kYoung, kMixed }; // When setting age for a range, consider or ignore ages of the adjacent // cards. enum class AdjacentCardsPolicy : uint8_t { kConsider, kIgnore }; static constexpr size_t kCardSizeInBytes = api_constants::kCagedHeapReservationSize / kRequiredSize; void SetAge(uintptr_t cage_offset, Age age) { table_[card(cage_offset)] = age; } V8_INLINE Age GetAge(uintptr_t cage_offset) const { return table_[card(cage_offset)]; } void SetAgeForRange(uintptr_t cage_offset_begin, uintptr_t cage_offset_end, Age age, AdjacentCardsPolicy adjacent_cards_policy); Age GetAgeForRange(uintptr_t cage_offset_begin, uintptr_t cage_offset_end) const; void ResetForTesting(); private: V8_INLINE size_t card(uintptr_t offset) const { constexpr size_t kGranularityBits = #if __cpp_lib_bitopts std::countr_zero(static_cast<uint32_t>(kCardSizeInBytes)); #elif V8_HAS_BUILTIN_CTZ __builtin_ctz(static_cast<uint32_t>(kCardSizeInBytes)); #else //! V8_HAS_BUILTIN_CTZ // Hardcode and check with assert. #if defined(CPPGC_2GB_CAGE) 11; #else // !defined(CPPGC_2GB_CAGE) 12; #endif // !defined(CPPGC_2GB_CAGE) #endif // !V8_HAS_BUILTIN_CTZ static_assert((1 << kGranularityBits) == kCardSizeInBytes); const size_t entry = offset >> kGranularityBits; CPPGC_DCHECK(table_.size() > entry); return entry; } std::array<Age, kRequiredSize> table_; }; static_assert(sizeof(AgeTable) == 1 * api_constants::kMB, "Size of AgeTable is 1MB"); #endif // CPPGC_YOUNG_GENERATION struct CagedHeapLocalData final { V8_INLINE static CagedHeapLocalData& Get() { return *reinterpret_cast<CagedHeapLocalData*>(CagedHeapBase::GetBase()); } #if defined(CPPGC_YOUNG_GENERATION) AgeTable age_table; #endif }; } // namespace internal } // namespace cppgc #endif // defined(CPPGC_CAGED_HEAP) #endif // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_LOCAL_DATA_H_