// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_ADDRESS_MAP_H_
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#define V8_ADDRESS_MAP_H_
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#include "include/v8.h"
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#include "src/assert-scope.h"
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#include "src/base/hashmap.h"
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#include "src/objects.h"
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namespace v8 {
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namespace internal {
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template <typename Type>
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class PointerToIndexHashMap
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: public base::TemplateHashMapImpl<uintptr_t, uint32_t,
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base::KeyEqualityMatcher<intptr_t>,
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base::DefaultAllocationPolicy> {
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public:
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typedef base::TemplateHashMapEntry<uintptr_t, uint32_t> Entry;
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inline void Set(Type value, uint32_t index) {
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uintptr_t key = Key(value);
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LookupOrInsert(key, Hash(key))->value = index;
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}
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inline Maybe<uint32_t> Get(Type value) const {
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uintptr_t key = Key(value);
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Entry* entry = Lookup(key, Hash(key));
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if (entry == nullptr) return Nothing<uint32_t>();
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return Just(entry->value);
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}
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private:
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static inline uintptr_t Key(Type value);
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static uint32_t Hash(uintptr_t key) { return static_cast<uint32_t>(key); }
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};
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template <>
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inline uintptr_t PointerToIndexHashMap<Address>::Key(Address value) {
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return static_cast<uintptr_t>(value);
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}
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template <typename Type>
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inline uintptr_t PointerToIndexHashMap<Type>::Key(Type value) {
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return reinterpret_cast<uintptr_t>(value);
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}
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class AddressToIndexHashMap : public PointerToIndexHashMap<Address> {};
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class HeapObjectToIndexHashMap : public PointerToIndexHashMap<HeapObject*> {};
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class RootIndexMap {
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public:
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explicit RootIndexMap(Isolate* isolate);
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static const int kInvalidRootIndex = -1;
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int Lookup(HeapObject* obj) {
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Maybe<uint32_t> maybe_index = map_->Get(obj);
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return maybe_index.IsJust() ? maybe_index.FromJust() : kInvalidRootIndex;
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}
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private:
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HeapObjectToIndexHashMap* map_;
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DISALLOW_COPY_AND_ASSIGN(RootIndexMap);
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_ADDRESS_MAP_H_
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