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// Copyright 2015 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_ADDRESS_MAP_H_
#define V8_ADDRESS_MAP_H_
#include "include/v8.h"
#include "src/assert-scope.h"
#include "src/base/hashmap.h"
#include "src/objects/heap-object.h"
#include "src/roots.h"
namespace v8 {
namespace internal {
template <typename Type>
class PointerToIndexHashMap
: public base::TemplateHashMapImpl<uintptr_t, uint32_t,
base::DefaultAllocationPolicy> {
typedef base::TemplateHashMapEntry<uintptr_t, uint32_t> Entry;
inline void Set(Type value, uint32_t index) {
uintptr_t key = Key(value);
LookupOrInsert(key, Hash(key))->value = index;
inline Maybe<uint32_t> Get(Type value) const {
uintptr_t key = Key(value);
Entry* entry = Lookup(key, Hash(key));
if (entry == nullptr) return Nothing<uint32_t>();
return Just(entry->value);
static inline uintptr_t Key(Type value);
static uint32_t Hash(uintptr_t key) { return static_cast<uint32_t>(key); }
template <>
inline uintptr_t PointerToIndexHashMap<Address>::Key(Address value) {
return static_cast<uintptr_t>(value);
template <>
inline uintptr_t PointerToIndexHashMap<HeapObject>::Key(HeapObject value) {
return value.ptr();
class AddressToIndexHashMap : public PointerToIndexHashMap<Address> {};
class HeapObjectToIndexHashMap : public PointerToIndexHashMap<HeapObject> {};
class RootIndexMap {
explicit RootIndexMap(Isolate* isolate);
// Returns true on successful lookup and sets *|out_root_list|.
bool Lookup(HeapObject obj, RootIndex* out_root_list) const {
Maybe<uint32_t> maybe_index = map_->Get(obj);
if (maybe_index.IsJust()) {
*out_root_list = static_cast<RootIndex>(maybe_index.FromJust());
return true;
return false;
bool Lookup(Address obj, RootIndex* out_root_list) const;
HeapObjectToIndexHashMap* map_;
} // namespace internal
} // namespace v8
#endif // V8_ADDRESS_MAP_H_