[serializer] split up src/snapshot/serialize.*

src/snapshot/serialize.h

Index: src/snapshot/serialize.h
diff --git a/src/snapshot/serialize.h b/src/snapshot/serialize.h
deleted file mode 100644
index f7420efea9dae2430c5497509e52f30def8fe773..0000000000000000000000000000000000000000
--- a/src/snapshot/serialize.h
+++ /dev/null
@@ -1,816 +0,0 @@
-// Copyright 2012 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_SERIALIZE_H_
-#define V8_SNAPSHOT_SERIALIZE_H_
-
-#include "src/address-map.h"
-#include "src/heap/heap.h"
-#include "src/objects.h"
-#include "src/snapshot/snapshot-source-sink.h"
-
-namespace v8 {
-namespace internal {
-
-class Isolate;
-class ScriptData;
-
-static const int kDeoptTableSerializeEntryCount = 64;
-
-// ExternalReferenceTable is a helper class that defines the relationship
-// between external references and their encodings. It is used to build
-// hashmaps in ExternalReferenceEncoder and ExternalReferenceDecoder.
-class ExternalReferenceTable {
- public:
-  static ExternalReferenceTable* instance(Isolate* isolate);
-
-  int size() const { return refs_.length(); }
-  Address address(int i) { return refs_[i].address; }
-  const char* name(int i) { return refs_[i].name; }
-
-  inline static Address NotAvailable() { return NULL; }
-
- private:
-  struct ExternalReferenceEntry {
-    Address address;
-    const char* name;
-  };
-
-  explicit ExternalReferenceTable(Isolate* isolate);
-
-  void Add(Address address, const char* name) {
-    ExternalReferenceEntry entry = {address, name};
-    refs_.Add(entry);
-  }
-
-  List<ExternalReferenceEntry> refs_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExternalReferenceTable);
-};
-
-
-class ExternalReferenceEncoder {
- public:
-  explicit ExternalReferenceEncoder(Isolate* isolate);
-
-  uint32_t Encode(Address key) const;
-
-  const char* NameOfAddress(Isolate* isolate, Address address) const;
-
- private:
-  static uint32_t Hash(Address key) {
-    return static_cast<uint32_t>(reinterpret_cast<uintptr_t>(key) >>
-                                 kPointerSizeLog2);
-  }
-
-  HashMap* map_;
-
-  DISALLOW_COPY_AND_ASSIGN(ExternalReferenceEncoder);
-};
-
-
-class PartialCacheIndexMap : public AddressMapBase {
- public:
-  PartialCacheIndexMap() : map_(HashMap::PointersMatch) {}
-
-  static const int kInvalidIndex = -1;
-
-  // Lookup object in the map. Return its index if found, or create
-  // a new entry with new_index as value, and return kInvalidIndex.
-  int LookupOrInsert(HeapObject* obj, int new_index) {
-    HashMap::Entry* entry = LookupEntry(&map_, obj, false);
-    if (entry != NULL) return GetValue(entry);
-    SetValue(LookupEntry(&map_, obj, true), static_cast<uint32_t>(new_index));
-    return kInvalidIndex;
-  }
-
- private:
-  HashMap map_;
-
-  DISALLOW_COPY_AND_ASSIGN(PartialCacheIndexMap);
-};
-
-
-class HotObjectsList {
- public:
-  HotObjectsList() : index_(0) {
-    for (int i = 0; i < kSize; i++) circular_queue_[i] = NULL;
-  }
-
-  void Add(HeapObject* object) {
-    circular_queue_[index_] = object;
-    index_ = (index_ + 1) & kSizeMask;
-  }
-
-  HeapObject* Get(int index) {
-    DCHECK_NOT_NULL(circular_queue_[index]);
-    return circular_queue_[index];
-  }
-
-  static const int kNotFound = -1;
-
-  int Find(HeapObject* object) {
-    for (int i = 0; i < kSize; i++) {
-      if (circular_queue_[i] == object) return i;
-    }
-    return kNotFound;
-  }
-
-  static const int kSize = 8;
-
- private:
-  STATIC_ASSERT(IS_POWER_OF_TWO(kSize));
-  static const int kSizeMask = kSize - 1;
-  HeapObject* circular_queue_[kSize];
-  int index_;
-
-  DISALLOW_COPY_AND_ASSIGN(HotObjectsList);
-};
-
-
-// The Serializer/Deserializer class is a common superclass for Serializer and
-// Deserializer which is used to store common constants and methods used by
-// both.
-class SerializerDeserializer: public ObjectVisitor {
- public:
-  static void Iterate(Isolate* isolate, ObjectVisitor* visitor);
-
-  // No reservation for large object space necessary.
-  static const int kNumberOfPreallocatedSpaces = LAST_PAGED_SPACE + 1;
-  static const int kNumberOfSpaces = LAST_SPACE + 1;
-
- protected:
-  static bool CanBeDeferred(HeapObject* o);
-
-  // ---------- byte code range 0x00..0x7f ----------
-  // Byte codes in this range represent Where, HowToCode and WhereToPoint.
-  // Where the pointed-to object can be found:
-  // The static assert below will trigger when the number of preallocated spaces
-  // changed. If that happens, update the bytecode ranges in the comments below.
-  STATIC_ASSERT(5 == kNumberOfSpaces);
-  enum Where {
-    // 0x00..0x04  Allocate new object, in specified space.
-    kNewObject = 0,
-    // 0x05        Unused (including 0x25, 0x45, 0x65).
-    // 0x06        Unused (including 0x26, 0x46, 0x66).
-    // 0x07        Unused (including 0x27, 0x47, 0x67).
-    // 0x08..0x0c  Reference to previous object from space.
-    kBackref = 0x08,
-    // 0x0d        Unused (including 0x2d, 0x4d, 0x6d).
-    // 0x0e        Unused (including 0x2e, 0x4e, 0x6e).
-    // 0x0f        Unused (including 0x2f, 0x4f, 0x6f).
-    // 0x10..0x14  Reference to previous object from space after skip.
-    kBackrefWithSkip = 0x10,
-    // 0x15        Unused (including 0x35, 0x55, 0x75).
-    // 0x16        Unused (including 0x36, 0x56, 0x76).
-    // 0x17        Misc (including 0x37, 0x57, 0x77).
-    // 0x18        Root array item.
-    kRootArray = 0x18,
-    // 0x19        Object in the partial snapshot cache.
-    kPartialSnapshotCache = 0x19,
-    // 0x1a        External reference referenced by id.
-    kExternalReference = 0x1a,
-    // 0x1b        Object provided in the attached list.
-    kAttachedReference = 0x1b,
-    // 0x1c        Builtin code referenced by index.
-    kBuiltin = 0x1c
-    // 0x1d..0x1f  Misc (including 0x3d..0x3f, 0x5d..0x5f, 0x7d..0x7f)
-  };
-
-  static const int kWhereMask = 0x1f;
-  static const int kSpaceMask = 7;
-  STATIC_ASSERT(kNumberOfSpaces <= kSpaceMask + 1);
-
-  // How to code the pointer to the object.
-  enum HowToCode {
-    // Straight pointer.
-    kPlain = 0,
-    // A pointer inlined in code. What this means depends on the architecture.
-    kFromCode = 0x20
-  };
-
-  static const int kHowToCodeMask = 0x20;
-
-  // Where to point within the object.
-  enum WhereToPoint {
-    // Points to start of object
-    kStartOfObject = 0,
-    // Points to instruction in code object or payload of cell.
-    kInnerPointer = 0x40
-  };
-
-  static const int kWhereToPointMask = 0x40;
-
-  // ---------- Misc ----------
-  // Skip.
-  static const int kSkip = 0x1d;
-  // Internal reference encoded as offsets of pc and target from code entry.
-  static const int kInternalReference = 0x1e;
-  static const int kInternalReferenceEncoded = 0x1f;
-  // Do nothing, used for padding.
-  static const int kNop = 0x3d;
-  // Move to next reserved chunk.
-  static const int kNextChunk = 0x3e;
-  // Deferring object content.
-  static const int kDeferred = 0x3f;
-  // Used for the source code of the natives, which is in the executable, but
-  // is referred to from external strings in the snapshot.
-  static const int kNativesStringResource = 0x5d;
-  // Used for the source code for compiled stubs, which is in the executable,
-  // but is referred to from external strings in the snapshot.
-  static const int kExtraNativesStringResource = 0x5e;
-  // A tag emitted at strategic points in the snapshot to delineate sections.
-  // If the deserializer does not find these at the expected moments then it
-  // is an indication that the snapshot and the VM do not fit together.
-  // Examine the build process for architecture, version or configuration
-  // mismatches.
-  static const int kSynchronize = 0x17;
-  // Repeats of variable length.
-  static const int kVariableRepeat = 0x37;
-  // Raw data of variable length.
-  static const int kVariableRawData = 0x57;
-  // Alignment prefixes 0x7d..0x7f
-  static const int kAlignmentPrefix = 0x7d;
-
-  // 0x77 unused
-
-  // ---------- byte code range 0x80..0xff ----------
-  // First 32 root array items.
-  static const int kNumberOfRootArrayConstants = 0x20;
-  // 0x80..0x9f
-  static const int kRootArrayConstants = 0x80;
-  // 0xa0..0xbf
-  static const int kRootArrayConstantsWithSkip = 0xa0;
-  static const int kRootArrayConstantsMask = 0x1f;
-
-  // 8 hot (recently seen or back-referenced) objects with optional skip.
-  static const int kNumberOfHotObjects = 0x08;
-  // 0xc0..0xc7
-  static const int kHotObject = 0xc0;
-  // 0xc8..0xcf
-  static const int kHotObjectWithSkip = 0xc8;
-  static const int kHotObjectMask = 0x07;
-
-  // 32 common raw data lengths.
-  static const int kNumberOfFixedRawData = 0x20;
-  // 0xd0..0xef
-  static const int kFixedRawData = 0xd0;
-  static const int kOnePointerRawData = kFixedRawData;
-  static const int kFixedRawDataStart = kFixedRawData - 1;
-
-  // 16 repeats lengths.
-  static const int kNumberOfFixedRepeat = 0x10;
-  // 0xf0..0xff
-  static const int kFixedRepeat = 0xf0;
-  static const int kFixedRepeatStart = kFixedRepeat - 1;
-
-  // ---------- special values ----------
-  static const int kAnyOldSpace = -1;
-
-  // Sentinel after a new object to indicate that double alignment is needed.
-  static const int kDoubleAlignmentSentinel = 0;
-
-  // Used as index for the attached reference representing the source object.
-  static const int kSourceObjectReference = 0;
-
-  // Used as index for the attached reference representing the global proxy.
-  static const int kGlobalProxyReference = 0;
-
-  // ---------- member variable ----------
-  HotObjectsList hot_objects_;
-};
-
-
-class SerializedData {
- public:
-  class Reservation {
-   public:
-    explicit Reservation(uint32_t size)
-        : reservation_(ChunkSizeBits::encode(size)) {}
-
-    uint32_t chunk_size() const { return ChunkSizeBits::decode(reservation_); }
-    bool is_last() const { return IsLastChunkBits::decode(reservation_); }
-
-    void mark_as_last() { reservation_ |= IsLastChunkBits::encode(true); }
-
-   private:
-    uint32_t reservation_;
-  };
-
-  SerializedData(byte* data, int size)
-      : data_(data), size_(size), owns_data_(false) {}
-  SerializedData() : data_(NULL), size_(0), owns_data_(false) {}
-
-  ~SerializedData() {
-    if (owns_data_) DeleteArray<byte>(data_);
-  }
-
-  uint32_t GetMagicNumber() const { return GetHeaderValue(kMagicNumberOffset); }
-
-  class ChunkSizeBits : public BitField<uint32_t, 0, 31> {};
-  class IsLastChunkBits : public BitField<bool, 31, 1> {};
-
-  static uint32_t ComputeMagicNumber(ExternalReferenceTable* table) {
-    uint32_t external_refs = table->size();
-    return 0xC0DE0000 ^ external_refs;
-  }
-
- protected:
-  void SetHeaderValue(int offset, uint32_t value) {
-    uint32_t* address = reinterpret_cast<uint32_t*>(data_ + offset);
-    memcpy(reinterpret_cast<uint32_t*>(address), &value, sizeof(value));
-  }
-
-  uint32_t GetHeaderValue(int offset) const {
-    uint32_t value;
-    memcpy(&value, reinterpret_cast<int*>(data_ + offset), sizeof(value));
-    return value;
-  }
-
-  void AllocateData(int size);
-
-  static uint32_t ComputeMagicNumber(Isolate* isolate) {
-    return ComputeMagicNumber(ExternalReferenceTable::instance(isolate));
-  }
-
-  void SetMagicNumber(Isolate* isolate) {
-    SetHeaderValue(kMagicNumberOffset, ComputeMagicNumber(isolate));
-  }
-
-  static const int kMagicNumberOffset = 0;
-
-  byte* data_;
-  int size_;
-  bool owns_data_;
-};
-
-
-// A Deserializer reads a snapshot and reconstructs the Object graph it defines.
-class Deserializer: public SerializerDeserializer {
- public:
-  // Create a deserializer from a snapshot byte source.
-  template <class Data>
-  explicit Deserializer(Data* data)
-      : isolate_(NULL),
-        source_(data->Payload()),
-        magic_number_(data->GetMagicNumber()),
-        external_reference_table_(NULL),
-        deserialized_large_objects_(0),
-        deserializing_user_code_(false),
-        next_alignment_(kWordAligned) {
-    DecodeReservation(data->Reservations());
-  }
-
-  ~Deserializer() override;
-
-  // Deserialize the snapshot into an empty heap.
-  void Deserialize(Isolate* isolate);
-
-  // Deserialize a single object and the objects reachable from it.
-  MaybeHandle<Object> DeserializePartial(Isolate* isolate,
-                                         Handle<JSGlobalProxy> global_proxy);
-
-  // Deserialize a shared function info. Fail gracefully.
-  MaybeHandle<SharedFunctionInfo> DeserializeCode(Isolate* isolate);
-
-  // Pass a vector of externally-provided objects referenced by the snapshot.
-  // The ownership to its backing store is handed over as well.
-  void SetAttachedObjects(Vector<Handle<Object> > attached_objects) {
-    attached_objects_ = attached_objects;
-  }
-
- private:
-  void VisitPointers(Object** start, Object** end) override;
-
-  void Synchronize(VisitorSynchronization::SyncTag tag) override;
-
-  void VisitRuntimeEntry(RelocInfo* rinfo) override { UNREACHABLE(); }
-
-  void Initialize(Isolate* isolate);
-
-  bool deserializing_user_code() { return deserializing_user_code_; }
-
-  void DecodeReservation(Vector<const SerializedData::Reservation> res);
-
-  bool ReserveSpace();
-
-  void UnalignedCopy(Object** dest, Object** src) {
-    memcpy(dest, src, sizeof(*src));
-  }
-
-  void SetAlignment(byte data) {
-    DCHECK_EQ(kWordAligned, next_alignment_);
-    int alignment = data - (kAlignmentPrefix - 1);
-    DCHECK_LE(kWordAligned, alignment);
-    DCHECK_LE(alignment, kSimd128Unaligned);
-    next_alignment_ = static_cast<AllocationAlignment>(alignment);
-  }
-
-  void DeserializeDeferredObjects();
-
-  void FlushICacheForNewIsolate();
-  void FlushICacheForNewCodeObjects();
-
-  void CommitPostProcessedObjects(Isolate* isolate);
-
-  // Fills in some heap data in an area from start to end (non-inclusive).  The
-  // space id is used for the write barrier.  The object_address is the address
-  // of the object we are writing into, or NULL if we are not writing into an
-  // object, i.e. if we are writing a series of tagged values that are not on
-  // the heap. Return false if the object content has been deferred.
-  bool ReadData(Object** start, Object** end, int space,
-                Address object_address);
-  void ReadObject(int space_number, Object** write_back);
-  Address Allocate(int space_index, int size);
-
-  // Special handling for serialized code like hooking up internalized strings.
-  HeapObject* PostProcessNewObject(HeapObject* obj, int space);
-
-  // This returns the address of an object that has been described in the
-  // snapshot by chunk index and offset.
-  HeapObject* GetBackReferencedObject(int space);
-
-  Object** CopyInNativesSource(Vector<const char> source_vector,
-                               Object** current);
-
-  // Cached current isolate.
-  Isolate* isolate_;
-
-  // Objects from the attached object descriptions in the serialized user code.
-  Vector<Handle<Object> > attached_objects_;
-
-  SnapshotByteSource source_;
-  uint32_t magic_number_;
-
-  // The address of the next object that will be allocated in each space.
-  // Each space has a number of chunks reserved by the GC, with each chunk
-  // fitting into a page. Deserialized objects are allocated into the
-  // current chunk of the target space by bumping up high water mark.
-  Heap::Reservation reservations_[kNumberOfSpaces];
-  uint32_t current_chunk_[kNumberOfPreallocatedSpaces];
-  Address high_water_[kNumberOfPreallocatedSpaces];
-
-  ExternalReferenceTable* external_reference_table_;
-
-  List<HeapObject*> deserialized_large_objects_;
-  List<Code*> new_code_objects_;
-  List<Handle<String> > new_internalized_strings_;
-  List<Handle<Script> > new_scripts_;
-
-  bool deserializing_user_code_;
-
-  AllocationAlignment next_alignment_;
-
-  DISALLOW_COPY_AND_ASSIGN(Deserializer);
-};
-
-
-class CodeAddressMap;
-
-// There can be only one serializer per V8 process.
-class Serializer : public SerializerDeserializer {
- public:
-  Serializer(Isolate* isolate, SnapshotByteSink* sink);
-  ~Serializer() override;
-
-  void EncodeReservations(List<SerializedData::Reservation>* out) const;
-
-  void SerializeDeferredObjects();
-
-  Isolate* isolate() const { return isolate_; }
-
-  BackReferenceMap* back_reference_map() { return &back_reference_map_; }
-  RootIndexMap* root_index_map() { return &root_index_map_; }
-
-#ifdef OBJECT_PRINT
-  void CountInstanceType(Map* map, int size);
-#endif  // OBJECT_PRINT
-
- protected:
-  class ObjectSerializer;
-  class RecursionScope {
-   public:
-    explicit RecursionScope(Serializer* serializer) : serializer_(serializer) {
-      serializer_->recursion_depth_++;
-    }
-    ~RecursionScope() { serializer_->recursion_depth_--; }
-    bool ExceedsMaximum() {
-      return serializer_->recursion_depth_ >= kMaxRecursionDepth;
-    }
-
-   private:
-    static const int kMaxRecursionDepth = 32;
-    Serializer* serializer_;
-  };
-
-  virtual void SerializeObject(HeapObject* o, HowToCode how_to_code,
-                               WhereToPoint where_to_point, int skip) = 0;
-
-  void PutRoot(int index, HeapObject* object, HowToCode how, WhereToPoint where,
-               int skip);
-
-  void PutBackReference(HeapObject* object, BackReference reference);
-
-  // Emit alignment prefix if necessary, return required padding space in bytes.
-  int PutAlignmentPrefix(HeapObject* object);
-
-  // Returns true if the object was successfully serialized.
-  bool SerializeKnownObject(HeapObject* obj, HowToCode how_to_code,
-                            WhereToPoint where_to_point, int skip);
-
-  inline void FlushSkip(int skip) {
-    if (skip != 0) {
-      sink_->Put(kSkip, "SkipFromSerializeObject");
-      sink_->PutInt(skip, "SkipDistanceFromSerializeObject");
-    }
-  }
-
-  bool BackReferenceIsAlreadyAllocated(BackReference back_reference);
-
-  // This will return the space for an object.
-  BackReference AllocateLargeObject(int size);
-  BackReference Allocate(AllocationSpace space, int size);
-  int EncodeExternalReference(Address addr) {
-    return external_reference_encoder_.Encode(addr);
-  }
-
-  // GetInt reads 4 bytes at once, requiring padding at the end.
-  void Pad();
-
-  // Some roots should not be serialized, because their actual value depends on
-  // absolute addresses and they are reset after deserialization, anyway.
-  bool ShouldBeSkipped(Object** current);
-
-  // We may not need the code address map for logging for every instance
-  // of the serializer.  Initialize it on demand.
-  void InitializeCodeAddressMap();
-
-  Code* CopyCode(Code* code);
-
-  inline uint32_t max_chunk_size(int space) const {
-    DCHECK_LE(0, space);
-    DCHECK_LT(space, kNumberOfSpaces);
-    return max_chunk_size_[space];
-  }
-
-  SnapshotByteSink* sink() const { return sink_; }
-
-  void QueueDeferredObject(HeapObject* obj) {
-    DCHECK(back_reference_map_.Lookup(obj).is_valid());
-    deferred_objects_.Add(obj);
-  }
-
-  void OutputStatistics(const char* name);
-
-  Isolate* isolate_;
-
-  SnapshotByteSink* sink_;
-  ExternalReferenceEncoder external_reference_encoder_;
-
-  BackReferenceMap back_reference_map_;
-  RootIndexMap root_index_map_;
-
-  int recursion_depth_;
-
-  friend class Deserializer;
-  friend class ObjectSerializer;
-  friend class RecursionScope;
-  friend class SnapshotData;
-
- private:
-  void VisitPointers(Object** start, Object** end) override;
-
-  CodeAddressMap* code_address_map_;
-  // Objects from the same space are put into chunks for bulk-allocation
-  // when deserializing. We have to make sure that each chunk fits into a
-  // page. So we track the chunk size in pending_chunk_ of a space, but
-  // when it exceeds a page, we complete the current chunk and start a new one.
-  uint32_t pending_chunk_[kNumberOfPreallocatedSpaces];
-  List<uint32_t> completed_chunks_[kNumberOfPreallocatedSpaces];
-  uint32_t max_chunk_size_[kNumberOfPreallocatedSpaces];
-
-  // We map serialized large objects to indexes for back-referencing.
-  uint32_t large_objects_total_size_;
-  uint32_t seen_large_objects_index_;
-
-  List<byte> code_buffer_;
-
-  // To handle stack overflow.
-  List<HeapObject*> deferred_objects_;
-
-#ifdef OBJECT_PRINT
-  static const int kInstanceTypes = 256;
-  int* instance_type_count_;
-  size_t* instance_type_size_;
-#endif  // OBJECT_PRINT
-
-  DISALLOW_COPY_AND_ASSIGN(Serializer);
-};
-
-
-class PartialSerializer : public Serializer {
- public:
-  PartialSerializer(Isolate* isolate, Serializer* startup_snapshot_serializer,
-                    SnapshotByteSink* sink)
-      : Serializer(isolate, sink),
-        startup_serializer_(startup_snapshot_serializer),
-        global_object_(NULL) {
-    InitializeCodeAddressMap();
-  }
-
-  ~PartialSerializer() override { OutputStatistics("PartialSerializer"); }
-
-  // Serialize the objects reachable from a single object pointer.
-  void Serialize(Object** o);
-
- private:
-  void SerializeObject(HeapObject* o, HowToCode how_to_code,
-                       WhereToPoint where_to_point, int skip) override;
-
-  int PartialSnapshotCacheIndex(HeapObject* o);
-  bool ShouldBeInThePartialSnapshotCache(HeapObject* o);
-
-  Serializer* startup_serializer_;
-  Object* global_object_;
-  PartialCacheIndexMap partial_cache_index_map_;
-  DISALLOW_COPY_AND_ASSIGN(PartialSerializer);
-};
-
-
-class StartupSerializer : public Serializer {
- public:
-  StartupSerializer(Isolate* isolate, SnapshotByteSink* sink);
-  ~StartupSerializer() override { OutputStatistics("StartupSerializer"); }
-
-  // Serialize the current state of the heap.  The order is:
-  // 1) Strong references.
-  // 2) Partial snapshot cache.
-  // 3) Weak references (e.g. the string table).
-  void SerializeStrongReferences();
-  void SerializeWeakReferencesAndDeferred();
-
- private:
-  // 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;
-
-  intptr_t root_index_wave_front_;
-  bool serializing_builtins_;
-  DISALLOW_COPY_AND_ASSIGN(StartupSerializer);
-};
-
-
-class CodeSerializer : public Serializer {
- public:
-  static ScriptData* Serialize(Isolate* isolate,
-                               Handle<SharedFunctionInfo> info,
-                               Handle<String> source);
-
-  MUST_USE_RESULT static MaybeHandle<SharedFunctionInfo> Deserialize(
-      Isolate* isolate, ScriptData* cached_data, Handle<String> source);
-
-  static const int kSourceObjectIndex = 0;
-  STATIC_ASSERT(kSourceObjectReference == kSourceObjectIndex);
-
-  static const int kCodeStubsBaseIndex = 1;
-
-  String* source() const {
-    DCHECK(!AllowHeapAllocation::IsAllowed());
-    return source_;
-  }
-
-  const List<uint32_t>* stub_keys() const { return &stub_keys_; }
-
- private:
-  CodeSerializer(Isolate* isolate, SnapshotByteSink* sink, String* source)
-      : Serializer(isolate, sink), source_(source) {
-    back_reference_map_.AddSourceString(source);
-  }
-
-  ~CodeSerializer() override { OutputStatistics("CodeSerializer"); }
-
-  void SerializeObject(HeapObject* o, HowToCode how_to_code,
-                       WhereToPoint where_to_point, int skip) override;
-
-  void SerializeBuiltin(int builtin_index, HowToCode how_to_code,
-                        WhereToPoint where_to_point);
-  void SerializeIC(Code* ic, HowToCode how_to_code,
-                   WhereToPoint where_to_point);
-  void SerializeCodeStub(uint32_t stub_key, HowToCode how_to_code,
-                         WhereToPoint where_to_point);
-  void SerializeGeneric(HeapObject* heap_object, HowToCode how_to_code,
-                        WhereToPoint where_to_point);
-  int AddCodeStubKey(uint32_t stub_key);
-
-  DisallowHeapAllocation no_gc_;
-  String* source_;
-  List<uint32_t> stub_keys_;
-  DISALLOW_COPY_AND_ASSIGN(CodeSerializer);
-};
-
-
-// Wrapper around reservation sizes and the serialization payload.
-class SnapshotData : public SerializedData {
- public:
-  // Used when producing.
-  explicit SnapshotData(const Serializer& ser);
-
-  // Used when consuming.
-  explicit SnapshotData(const Vector<const byte> snapshot)
-      : SerializedData(const_cast<byte*>(snapshot.begin()), snapshot.length()) {
-    CHECK(IsSane());
-  }
-
-  Vector<const Reservation> Reservations() const;
-  Vector<const byte> Payload() const;
-
-  Vector<const byte> RawData() const {
-    return Vector<const byte>(data_, size_);
-  }
-
- private:
-  bool IsSane();
-
-  // The data header consists of uint32_t-sized entries:
-  // [0] magic number and external reference count
-  // [1] version hash
-  // [2] number of reservation size entries
-  // [3] payload length
-  // ... reservations
-  // ... serialized payload
-  static const int kCheckSumOffset = kMagicNumberOffset + kInt32Size;
-  static const int kNumReservationsOffset = kCheckSumOffset + kInt32Size;
-  static const int kPayloadLengthOffset = kNumReservationsOffset + kInt32Size;
-  static const int kHeaderSize = kPayloadLengthOffset + kInt32Size;
-};
-
-
-// Wrapper around ScriptData to provide code-serializer-specific functionality.
-class SerializedCodeData : public SerializedData {
- public:
-  // Used when consuming.
-  static SerializedCodeData* FromCachedData(Isolate* isolate,
-                                            ScriptData* cached_data,
-                                            String* source);
-
-  // Used when producing.
-  SerializedCodeData(const List<byte>& payload, const CodeSerializer& cs);
-
-  // Return ScriptData object and relinquish ownership over it to the caller.
-  ScriptData* GetScriptData();
-
-  Vector<const Reservation> Reservations() const;
-  Vector<const byte> Payload() const;
-
-  Vector<const uint32_t> CodeStubKeys() const;
-
- private:
-  explicit SerializedCodeData(ScriptData* data);
-
-  enum SanityCheckResult {
-    CHECK_SUCCESS = 0,
-    MAGIC_NUMBER_MISMATCH = 1,
-    VERSION_MISMATCH = 2,
-    SOURCE_MISMATCH = 3,
-    CPU_FEATURES_MISMATCH = 4,
-    FLAGS_MISMATCH = 5,
-    CHECKSUM_MISMATCH = 6
-  };
-
-  SanityCheckResult SanityCheck(Isolate* isolate, String* source) const;
-
-  uint32_t SourceHash(String* source) const;
-
-  // The data header consists of uint32_t-sized entries:
-  // [0] magic number and external reference count
-  // [1] version hash
-  // [2] source hash
-  // [3] cpu features
-  // [4] flag hash
-  // [5] number of code stub keys
-  // [6] number of reservation size entries
-  // [7] payload length
-  // [8] payload checksum part 1
-  // [9] payload checksum part 2
-  // ...  reservations
-  // ...  code stub keys
-  // ...  serialized payload
-  static const int kVersionHashOffset = kMagicNumberOffset + kInt32Size;
-  static const int kSourceHashOffset = kVersionHashOffset + kInt32Size;
-  static const int kCpuFeaturesOffset = kSourceHashOffset + kInt32Size;
-  static const int kFlagHashOffset = kCpuFeaturesOffset + kInt32Size;
-  static const int kNumReservationsOffset = kFlagHashOffset + kInt32Size;
-  static const int kNumCodeStubKeysOffset = kNumReservationsOffset + kInt32Size;
-  static const int kPayloadLengthOffset = kNumCodeStubKeysOffset + kInt32Size;
-  static const int kChecksum1Offset = kPayloadLengthOffset + kInt32Size;
-  static const int kChecksum2Offset = kChecksum1Offset + kInt32Size;
-  static const int kHeaderSize = kChecksum2Offset + kInt32Size;
-};
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_SNAPSHOT_SERIALIZE_H_