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// Copyright 2016 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_STARTUP_SERIALIZER_H_
#define V8_SNAPSHOT_STARTUP_SERIALIZER_H_
#include <bitset>
#include "include/v8.h"
#include "src/snapshot/serializer.h"
namespace v8 {
namespace internal {
class StartupSerializer : public Serializer {
public:
StartupSerializer(
Isolate* isolate,
v8::SnapshotCreator::FunctionCodeHandling function_code_handling);
~StartupSerializer() override;
// Serialize the current state of the heap. The order is:
// 1) Immortal immovable roots
// 2) Remaining strong references.
// 3) Partial snapshot cache.
// 4) Weak references (e.g. the string table).
void SerializeStrongReferences();
void SerializeWeakReferencesAndDeferred();
int PartialSnapshotCacheIndex(HeapObject* o);
private:
class PartialCacheIndexMap : public AddressMapBase {
public:
PartialCacheIndexMap() : map_(), next_index_(0) {}
// Lookup object in the map. Return its index if found, or create
// a new entry with new_index as value, and return kInvalidIndex.
bool LookupOrInsert(HeapObject* obj, int* index_out) {
base::HashMap::Entry* entry = LookupEntry(&map_, obj, false);
if (entry != NULL) {
*index_out = GetValue(entry);
return true;
}
*index_out = next_index_;
SetValue(LookupEntry(&map_, obj, true), next_index_++);
return false;
}
private:
base::HashMap map_;
int next_index_;
DISALLOW_COPY_AND_ASSIGN(PartialCacheIndexMap);
};
// The StartupSerializer has to serialize the root array, which is slightly
// different.
void VisitPointers(Object** start, Object** end) override;
void SerializeObject(HeapObject* o, HowToCode how_to_code,
WhereToPoint where_to_point, int skip) override;
void Synchronize(VisitorSynchronization::SyncTag tag) override;
// Some roots should not be serialized, because their actual value depends on
// absolute addresses and they are reset after deserialization, anyway.
// In the first pass over the root list, we only serialize immortal immovable
// roots. In the second pass, we serialize the rest.
bool RootShouldBeSkipped(int root_index);
bool clear_function_code_;
bool serializing_builtins_;
bool serializing_immortal_immovables_roots_;
std::bitset<Heap::kStrongRootListLength> root_has_been_serialized_;
PartialCacheIndexMap partial_cache_index_map_;
DISALLOW_COPY_AND_ASSIGN(StartupSerializer);
};
} // namespace internal
} // namespace v8
#endif // V8_SNAPSHOT_STARTUP_SERIALIZER_H_
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