chromium/v8/src/compiler/refs-map.h

// 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/zone/zone.h"

namespace v8 {
namespace internal {
namespace compiler {

class ObjectData;

class AddressMatcher : public base::KeyEqualityMatcher<Address> { … };

// 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 { … };

}  // namespace compiler
}  // namespace internal
}  // namespace v8

#endif  // V8_COMPILER_REFS_MAP_H_