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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 <unordered_set>
#include "src/handles/global-handles.h"
#include "src/snapshot/roots-serializer.h"
namespace v8 {
namespace internal {
class HeapObject;
class SnapshotByteSink;
class ReadOnlySerializer;
class V8_EXPORT_PRIVATE StartupSerializer : public RootsSerializer {
public:
StartupSerializer(Isolate* isolate, Snapshot::SerializerFlags flags,
ReadOnlySerializer* read_only_serializer);
~StartupSerializer() override;
StartupSerializer(const StartupSerializer&) = delete;
StartupSerializer& operator=(const StartupSerializer&) = delete;
// Serialize the current state of the heap. The order is:
// 1) Strong roots
// 2) Builtins and bytecode handlers
// 3) Startup object cache
// 4) Weak references (e.g. the string table)
void SerializeStrongReferences(const DisallowGarbageCollection& no_gc);
void SerializeWeakReferencesAndDeferred();
// If |obj| can be serialized in the read-only snapshot then add it to the
// read-only object cache if not already present and emits a
// ReadOnlyObjectCache bytecode into |sink|. Returns whether this was
// successful.
bool SerializeUsingReadOnlyObjectCache(SnapshotByteSink* sink,
Handle<HeapObject> obj);
// Adds |obj| to the startup object object cache if not already present and
// emits a StartupObjectCache bytecode into |sink|.
void SerializeUsingStartupObjectCache(SnapshotByteSink* sink,
Handle<HeapObject> obj);
// The per-heap dirty FinalizationRegistry list is weak and not serialized. No
// JSFinalizationRegistries should be used during startup.
void CheckNoDirtyFinalizationRegistries();
private:
void SerializeObjectImpl(Handle<HeapObject> o) override;
void SerializeStringTable(StringTable* string_table);
ReadOnlySerializer* read_only_serializer_;
GlobalHandleVector<AccessorInfo> accessor_infos_;
GlobalHandleVector<CallHandlerInfo> call_handler_infos_;
};
class SerializedHandleChecker : public RootVisitor {
public:
SerializedHandleChecker(Isolate* isolate, std::vector<Context>* contexts);
void VisitRootPointers(Root root, const char* description,
FullObjectSlot start, FullObjectSlot end) override;
bool CheckGlobalAndEternalHandles();
private:
void AddToSet(FixedArray serialized);
Isolate* isolate_;
std::unordered_set<Object, Object::Hasher> serialized_;
bool ok_ = true;
};
} // namespace internal
} // namespace v8
#endif // V8_SNAPSHOT_STARTUP_SERIALIZER_H_
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