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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_SNAPSHOT_ROOTS_SERIALIZER_H_
#define V8_SNAPSHOT_ROOTS_SERIALIZER_H_
#include <bitset>
#include "src/objects/visitors.h"
#include "src/snapshot/serializer.h"
namespace v8 {
namespace internal {
class HeapObject;
class Object;
class Isolate;
enum class RootIndex : uint16_t;
// Base class for serializer that iterate over roots. Also maintains a cache
// that can be used to share non-root objects with other serializers.
class RootsSerializer : public Serializer {
public:
// The serializer expects that all roots before |first_root_to_be_serialized|
// are already serialized.
RootsSerializer(Isolate* isolate, RootIndex first_root_to_be_serialized);
bool can_be_rehashed() const { return can_be_rehashed_; }
bool root_has_been_serialized(RootIndex root_index) const {
return root_has_been_serialized_.test(static_cast<size_t>(root_index));
}
bool IsRootAndHasBeenSerialized(HeapObject obj) const {
RootIndex root_index;
return root_index_map()->Lookup(obj, &root_index) &&
root_has_been_serialized(root_index);
}
protected:
void CheckRehashability(HeapObject obj);
// Serializes |object| if not previously seen and returns its cache index.
int SerializeInObjectCache(HeapObject object);
private:
void VisitRootPointers(Root root, const char* description,
FullObjectSlot start, FullObjectSlot end) override;
void Synchronize(VisitorSynchronization::SyncTag tag) override;
const RootIndex first_root_to_be_serialized_;
std::bitset<RootsTable::kEntriesCount> root_has_been_serialized_;
ObjectCacheIndexMap object_cache_index_map_;
// Indicates whether we only serialized hash tables that we can rehash.
// TODO(yangguo): generalize rehashing, and remove this flag.
bool can_be_rehashed_;
DISALLOW_COPY_AND_ASSIGN(RootsSerializer);
};
} // namespace internal
} // namespace v8
#endif // V8_SNAPSHOT_ROOTS_SERIALIZER_H_