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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_