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// Copyright 2018 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 V8_COMPILER_REFS_MAP_H_ #define V8_COMPILER_REFS_MAP_H_ #include "src/base/hashmap.h" #include "src/common/globals.h" #include "src/zone/zone.h" namespace v8 { namespace internal { namespace compiler { class ObjectData; class AddressMatcher : public base::KeyEqualityMatcher<Address> { public: bool operator()(uint32_t hash1, uint32_t hash2, const Address& key1, const Address& key2) const { return key1 == key2; } }; // This class employs our own implementation of hash map for the purpose of // storing the mapping between canonical Addresses and allocated ObjectData. // It's used as the refs map in JSHeapBroker and as the snapshot in // PerIsolateCompilerCache, as we need a cheap copy between the two and // std::unordered_map doesn't satisfy this requirement, as it rehashes the // whole map and copies all entries one by one. class RefsMap : public base::TemplateHashMapImpl<Address, ObjectData*, AddressMatcher, ZoneAllocationPolicy>, public ZoneObject { public: RefsMap(uint32_t capacity, AddressMatcher match, Zone* zone); RefsMap(const RefsMap* other, Zone* zone); bool IsEmpty() const { return occupancy() == 0; } // Wrappers around methods from UnderlyingMap Entry* Lookup(const Address& key) const; Entry* LookupOrInsert(const Address& key, Zone* zone); private: static uint32_t Hash(Address addr); }; } // namespace compiler } // namespace internal } // namespace v8 #endif // V8_COMPILER_REFS_MAP_H_