// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

#include "vm/clustered_snapshot.h"

#include "platform/assert.h"
#include "vm/bootstrap.h"
#include "vm/class_finalizer.h"
#include "vm/dart.h"
#include "vm/dart_entry.h"
#include "vm/exceptions.h"
#include "vm/heap.h"
#include "vm/lockers.h"
#include "vm/longjump.h"
#include "vm/native_entry.h"
#include "vm/object.h"
#include "vm/object_store.h"
#include "vm/stub_code.h"
#include "vm/symbols.h"
#include "vm/timeline.h"
#include "vm/version.h"

namespace dart {

static RawObject* AllocateUninitialized(PageSpace* old_space, intptr_t size) {
  ASSERT(Utils::IsAligned(size, kObjectAlignment));
  uword address = old_space->TryAllocateDataBumpLocked(size,
                                                       PageSpace::kForceGrowth);
  if (address == 0) {
    FATAL("Out of memory");
  }
  return reinterpret_cast<RawObject*>(address + kHeapObjectTag);
}


void Deserializer::InitializeHeader(RawObject* raw,
                                    intptr_t class_id,
                                    intptr_t size,
                                    bool is_vm_isolate,
                                    bool is_canonical) {
  ASSERT(Utils::IsAligned(size, kObjectAlignment));
  uword tags = 0;
  tags = RawObject::ClassIdTag::update(class_id, tags);
  tags = RawObject::SizeTag::update(size, tags);
  tags = RawObject::VMHeapObjectTag::update(is_vm_isolate, tags);
  tags = RawObject::CanonicalObjectTag::update(is_canonical, tags);
  raw->ptr()->tags_ = tags;
}


class ClassSerializationCluster : public SerializationCluster {
 public:
  explicit ClassSerializationCluster(intptr_t num_cids) :
      predefined_(kNumPredefinedCids), objects_(num_cids) { }
  virtual ~ClassSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawClass* cls = Class::RawCast(object);
    intptr_t class_id = cls->ptr()->id_;

    if (class_id < kNumPredefinedCids) {
      // These classes are allocated by Object::Init or Object::InitOnce, so the
      // deserializer must find them in the class table instead of allocating
      // them.
      predefined_.Add(cls);
    } else {
      objects_.Add(cls);
    }

    RawObject** from = cls->from();
    RawObject** to = cls->to_snapshot(s->kind());
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kClassCid);
    intptr_t count = predefined_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawClass* cls = predefined_[i];
      intptr_t class_id = cls->ptr()->id_;
      s->Write<intptr_t>(class_id);
      s->AssignRef(cls);
    }
    count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawClass* cls = objects_[i];
      s->AssignRef(cls);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = predefined_.length();
    for (intptr_t i = 0; i < count; i++) {
      WriteClass(s, predefined_[i]);
    }
    count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      WriteClass(s, objects_[i]);
    }
  }

  void WriteClass(Serializer* s, RawClass* cls) {
    Snapshot::Kind kind = s->kind();
    RawObject** from = cls->from();
    RawObject** to = cls->to_snapshot(kind);
    for (RawObject** p = from; p <= to; p++) {
      s->WriteRef(*p);
    }
    intptr_t class_id = cls->ptr()->id_;
    s->WriteCid(class_id);
    s->Write<int32_t>(cls->ptr()->instance_size_in_words_);
    s->Write<int32_t>(cls->ptr()->next_field_offset_in_words_);
    s->Write<int32_t>(cls->ptr()->type_arguments_field_offset_in_words_);
    s->Write<uint16_t>(cls->ptr()->num_type_arguments_);
    s->Write<uint16_t>(cls->ptr()->num_own_type_arguments_);
    s->Write<uint16_t>(cls->ptr()->num_native_fields_);
    s->WriteTokenPosition(cls->ptr()->token_pos_);
    s->Write<uint16_t>(cls->ptr()->state_bits_);
  }

 private:
  GrowableArray<RawClass*> predefined_;
  GrowableArray<RawClass*> objects_;
};


class ClassDeserializationCluster : public DeserializationCluster {
 public:
  ClassDeserializationCluster() { }
  virtual ~ClassDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    predefined_start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    ClassTable* table = d->isolate()->class_table();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t class_id = d->Read<intptr_t>();
      ASSERT(table->HasValidClassAt(class_id));
      RawClass* cls = table->At(class_id);
      ASSERT(cls != NULL);
      d->AssignRef(cls);
    }
    predefined_stop_index_ = d->next_index();

    start_index_ = d->next_index();
    count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         Class::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    Snapshot::Kind kind = d->kind();
    bool is_vm_object = d->isolate() == Dart::vm_isolate();
    ClassTable* table = d->isolate()->class_table();

    for (intptr_t id = predefined_start_index_;
         id < predefined_stop_index_;
         id++) {
      RawClass* cls = reinterpret_cast<RawClass*>(d->Ref(id));
      RawObject** from = cls->from();
      RawObject** to_snapshot = cls->to_snapshot(kind);
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }

      intptr_t class_id = d->ReadCid();
      cls->ptr()->id_ = class_id;
      cls->ptr()->instance_size_in_words_ = d->Read<int32_t>();
      cls->ptr()->next_field_offset_in_words_ = d->Read<int32_t>();
      cls->ptr()->type_arguments_field_offset_in_words_ = d->Read<int32_t>();
      cls->ptr()->num_type_arguments_ = d->Read<uint16_t>();
      cls->ptr()->num_own_type_arguments_ = d->Read<uint16_t>();
      cls->ptr()->num_native_fields_ = d->Read<uint16_t>();
      cls->ptr()->token_pos_ = d->ReadTokenPosition();
      cls->ptr()->state_bits_ = d->Read<uint16_t>();
    }

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawClass* cls = reinterpret_cast<RawClass*>(d->Ref(id));
      Deserializer::InitializeHeader(cls, kClassCid, Class::InstanceSize(),
                                     is_vm_object);
      RawObject** from = cls->from();
      RawObject** to_snapshot = cls->to_snapshot(kind);
      RawObject** to = cls->to();
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }
      for (RawObject** p = to_snapshot + 1; p <= to; p++) {
        *p = Object::null();
      }

      intptr_t class_id = d->ReadCid();

      ASSERT(class_id >= kNumPredefinedCids);
      Instance fake;
      cls->ptr()->handle_vtable_ = fake.vtable();

      cls->ptr()->id_ = class_id;
      cls->ptr()->instance_size_in_words_ = d->Read<int32_t>();
      cls->ptr()->next_field_offset_in_words_ = d->Read<int32_t>();
      cls->ptr()->type_arguments_field_offset_in_words_ = d->Read<int32_t>();
      cls->ptr()->num_type_arguments_ = d->Read<uint16_t>();
      cls->ptr()->num_own_type_arguments_ = d->Read<uint16_t>();
      cls->ptr()->num_native_fields_ = d->Read<uint16_t>();
      cls->ptr()->token_pos_ = d->ReadTokenPosition();
      cls->ptr()->state_bits_ = d->Read<uint16_t>();

      table->AllocateIndex(class_id);
      table->SetAt(class_id, cls);
    }
  }

  void PostLoad(const Array& refs, Snapshot::Kind kind, Zone* zone) {
    NOT_IN_PRODUCT(TimelineDurationScope tds(Thread::Current(),
        Timeline::GetIsolateStream(), "PostLoadClass"));

    Class& cls = Class::Handle(zone);
    for (intptr_t i = predefined_start_index_;
         i < predefined_stop_index_;
         i++) {
      cls ^= refs.At(i);
      cls.RehashConstants(zone);
    }
    for (intptr_t i = start_index_; i < stop_index_; i++) {
      cls ^= refs.At(i);
      cls.RehashConstants(zone);
    }
  }

 private:
  intptr_t predefined_start_index_;
  intptr_t predefined_stop_index_;
};


class UnresolvedClassSerializationCluster : public SerializationCluster {
 public:
  UnresolvedClassSerializationCluster() { }
  virtual ~UnresolvedClassSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawUnresolvedClass* cls = UnresolvedClass::RawCast(object);
    objects_.Add(cls);

    RawObject** from = cls->from();
    RawObject** to = cls->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kUnresolvedClassCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawUnresolvedClass* cls = objects_[i];
      s->AssignRef(cls);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawUnresolvedClass* cls = objects_[i];
      RawObject** from = cls->from();
      RawObject** to = cls->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->WriteTokenPosition(cls->ptr()->token_pos_);
    }
  }

 private:
  GrowableArray<RawUnresolvedClass*> objects_;
};


class UnresolvedClassDeserializationCluster : public DeserializationCluster {
 public:
  UnresolvedClassDeserializationCluster() { }
  virtual ~UnresolvedClassDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         UnresolvedClass::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawUnresolvedClass* cls =
          reinterpret_cast<RawUnresolvedClass*>(d->Ref(id));
      Deserializer::InitializeHeader(cls, kUnresolvedClassCid,
                                     UnresolvedClass::InstanceSize(),
                                     is_vm_object);
      RawObject** from = cls->from();
      RawObject** to = cls->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      cls->ptr()->token_pos_ = d->ReadTokenPosition();
    }
  }
};


class TypeArgumentsSerializationCluster : public SerializationCluster {
 public:
  TypeArgumentsSerializationCluster() { }
  virtual ~TypeArgumentsSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawTypeArguments* type_args = TypeArguments::RawCast(object);
    objects_.Add(type_args);

    s->Push(type_args->ptr()->instantiations_);
    intptr_t length = Smi::Value(type_args->ptr()->length_);
    for (intptr_t i = 0; i < length; i++) {
      s->Push(type_args->ptr()->types()[i]);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kTypeArgumentsCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawTypeArguments* type_args = objects_[i];
      intptr_t length = Smi::Value(type_args->ptr()->length_);
      s->Write<intptr_t>(length);
      s->AssignRef(type_args);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawTypeArguments* type_args = objects_[i];
      intptr_t length = Smi::Value(type_args->ptr()->length_);
      s->Write<intptr_t>(length);
      s->Write<bool>(type_args->IsCanonical());
      intptr_t hash = Smi::Value(type_args->ptr()->hash_);
      s->Write<int32_t>(hash);
      s->WriteRef(type_args->ptr()->instantiations_);
      for (intptr_t j = 0; j < length; j++) {
        s->WriteRef(type_args->ptr()->types()[j]);
      }
    }
  }

 private:
  GrowableArray<RawTypeArguments*> objects_;
};


class TypeArgumentsDeserializationCluster : public DeserializationCluster {
 public:
  TypeArgumentsDeserializationCluster() { }
  virtual ~TypeArgumentsDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         TypeArguments::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawTypeArguments* type_args =
          reinterpret_cast<RawTypeArguments*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(type_args, kTypeArgumentsCid,
                                     TypeArguments::InstanceSize(length),
                                     is_vm_object, is_canonical);
      type_args->ptr()->length_ = Smi::New(length);
      type_args->ptr()->hash_ = Smi::New(d->Read<int32_t>());
      type_args->ptr()->instantiations_ =
          reinterpret_cast<RawArray*>(d->ReadRef());
      for (intptr_t j = 0; j < length; j++) {
        type_args->ptr()->types()[j] =
            reinterpret_cast<RawAbstractType*>(d->ReadRef());
      }
    }
  }
};


class PatchClassSerializationCluster : public SerializationCluster {
 public:
  PatchClassSerializationCluster() { }
  virtual ~PatchClassSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawPatchClass* cls = PatchClass::RawCast(object);
    objects_.Add(cls);

    RawObject** from = cls->from();
    RawObject** to = cls->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kPatchClassCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawPatchClass* cls = objects_[i];
      s->AssignRef(cls);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawPatchClass* cls = objects_[i];
      RawObject** from = cls->from();
      RawObject** to = cls->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawPatchClass*> objects_;
};


class PatchClassDeserializationCluster : public DeserializationCluster {
 public:
  PatchClassDeserializationCluster() { }
  virtual ~PatchClassDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         PatchClass::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawPatchClass* cls = reinterpret_cast<RawPatchClass*>(d->Ref(id));
      Deserializer::InitializeHeader(cls, kPatchClassCid,
                                     PatchClass::InstanceSize(), is_vm_object);
      RawObject** from = cls->from();
      RawObject** to = cls->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class FunctionSerializationCluster : public SerializationCluster {
 public:
  FunctionSerializationCluster() { }
  virtual ~FunctionSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawFunction* func = Function::RawCast(object);
    objects_.Add(func);

    RawObject** from = func->from();
    RawObject** to = func->to_snapshot();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
    if (s->kind() == Snapshot::kAppNoJIT) {
      s->Push(func->ptr()->code_);
    } else if (s->kind() == Snapshot::kAppWithJIT) {
      s->Push(func->ptr()->unoptimized_code_);
      s->Push(func->ptr()->ic_data_array_);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kFunctionCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawFunction* func = objects_[i];
      s->AssignRef(func);
    }
  }

  void WriteFill(Serializer* s) {
    Snapshot::Kind kind = s->kind();
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawFunction* func = objects_[i];
      RawObject** from = func->from();
      RawObject** to = func->to_snapshot();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      if (kind == Snapshot::kAppNoJIT) {
        s->WriteRef(func->ptr()->code_);
      } else if (s->kind() == Snapshot::kAppWithJIT) {
        s->WriteRef(func->ptr()->unoptimized_code_);
        s->WriteRef(func->ptr()->ic_data_array_);
      }

      s->WriteTokenPosition(func->ptr()->token_pos_);
      s->WriteTokenPosition(func->ptr()->end_token_pos_);
      s->Write<int16_t>(func->ptr()->num_fixed_parameters_);
      s->Write<int16_t>(func->ptr()->num_optional_parameters_);
      s->Write<uint32_t>(func->ptr()->kind_tag_);
      if (kind == Snapshot::kAppNoJIT) {
        // Omit fields used to support de/reoptimization.
      } else {
        bool is_optimized = Code::IsOptimized(func->ptr()->code_);
        if (is_optimized) {
          s->Write<int32_t>(FLAG_optimization_counter_threshold);
        } else {
          s->Write<int32_t>(0);
        }
        s->Write<int8_t>(func->ptr()->deoptimization_counter_);
        s->Write<uint16_t>(func->ptr()->optimized_instruction_count_);
        s->Write<uint16_t>(func->ptr()->optimized_call_site_count_);
      }
    }
  }

 private:
  GrowableArray<RawFunction*> objects_;
};


class FunctionDeserializationCluster : public DeserializationCluster {
 public:
  FunctionDeserializationCluster() { }
  virtual ~FunctionDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         Function::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    Snapshot::Kind kind = d->kind();
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawFunction* func = reinterpret_cast<RawFunction*>(d->Ref(id));
      Deserializer::InitializeHeader(func, kFunctionCid,
                                     Function::InstanceSize(), is_vm_object);
      RawObject** from = func->from();
      RawObject** to_snapshot = func->to_snapshot();
      RawObject** to = func->to();
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }
      for (RawObject** p = to_snapshot + 1; p <= to; p++) {
        *p = Object::null();
      }
      if (kind == Snapshot::kAppNoJIT) {
        func->ptr()->code_ = reinterpret_cast<RawCode*>(d->ReadRef());
      } else if (kind == Snapshot::kAppWithJIT) {
        func->ptr()->unoptimized_code_ =
            reinterpret_cast<RawCode*>(d->ReadRef());
        func->ptr()->ic_data_array_ = reinterpret_cast<RawArray*>(d->ReadRef());
      }

#if defined(DEBUG)
      func->ptr()->entry_point_ = 0;
#endif

      func->ptr()->token_pos_ = d->ReadTokenPosition();
      func->ptr()->end_token_pos_ = d->ReadTokenPosition();
      func->ptr()->num_fixed_parameters_ = d->Read<int16_t>();
      func->ptr()->num_optional_parameters_ = d->Read<int16_t>();
      func->ptr()->kind_tag_ = d->Read<uint32_t>();
      if (kind == Snapshot::kAppNoJIT) {
        // Omit fields used to support de/reoptimization.
      } else {
        func->ptr()->usage_counter_ = d->Read<int32_t>();
        func->ptr()->deoptimization_counter_ = d->Read<int8_t>();
        func->ptr()->optimized_instruction_count_ = d->Read<uint16_t>();
        func->ptr()->optimized_call_site_count_ = d->Read<uint16_t>();
      }
    }
  }

  void PostLoad(const Array& refs, Snapshot::Kind kind, Zone* zone) {
    NOT_IN_PRODUCT(TimelineDurationScope tds(Thread::Current(),
        Timeline::GetIsolateStream(), "PostLoadFunction"));

    if (kind == Snapshot::kAppNoJIT) {
      Function& func = Function::Handle(zone);
      for (intptr_t i = start_index_; i < stop_index_; i++) {
        func ^= refs.At(i);
        ASSERT(func.raw()->ptr()->code_->IsCode());
        uword entry_point = func.raw()->ptr()->code_->ptr()->entry_point_;
        ASSERT(entry_point != 0);
        func.raw()->ptr()->entry_point_ = entry_point;
      }
    } else if (kind == Snapshot::kAppWithJIT) {
      Function& func = Function::Handle(zone);
      Code& code = Code::Handle(zone);
      for (intptr_t i = start_index_; i < stop_index_; i++) {
        func ^= refs.At(i);
        code ^= func.unoptimized_code();
        if (!code.IsNull()) {
          func.SetInstructions(code);
          func.set_was_compiled(true);
        } else {
          func.ClearCode();
          func.set_was_compiled(false);
        }
      }
    } else {
      Function& func = Function::Handle(zone);
      for (intptr_t i = start_index_; i < stop_index_; i++) {
        func ^= refs.At(i);
        func.ClearICDataArray();
        func.ClearCode();
        func.set_was_compiled(false);
      }
    }
  }
};


class ClosureDataSerializationCluster : public SerializationCluster {
 public:
  ClosureDataSerializationCluster() { }
  virtual ~ClosureDataSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawClosureData* data = ClosureData::RawCast(object);
    objects_.Add(data);

    RawObject** from = data->from();
    RawObject** to = data->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kClosureDataCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawClosureData* data = objects_[i];
      s->AssignRef(data);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawClosureData* data = objects_[i];
      RawObject** from = data->from();
      RawObject** to = data->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawClosureData*> objects_;
};


class ClosureDataDeserializationCluster : public DeserializationCluster {
 public:
  ClosureDataDeserializationCluster() { }
  virtual ~ClosureDataDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         ClosureData::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawClosureData* data = reinterpret_cast<RawClosureData*>(d->Ref(id));
      Deserializer::InitializeHeader(data, kClosureDataCid,
                                     ClosureData::InstanceSize(), is_vm_object);
      RawObject** from = data->from();
      RawObject** to = data->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class RedirectionDataSerializationCluster : public SerializationCluster {
 public:
  RedirectionDataSerializationCluster() { }
  virtual ~RedirectionDataSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawRedirectionData* data = RedirectionData::RawCast(object);
    objects_.Add(data);

    RawObject** from = data->from();
    RawObject** to = data->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kRedirectionDataCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawRedirectionData* data = objects_[i];
      s->AssignRef(data);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawRedirectionData* data = objects_[i];
      RawObject** from = data->from();
      RawObject** to = data->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawRedirectionData*> objects_;
};


class RedirectionDataDeserializationCluster : public DeserializationCluster {
 public:
  RedirectionDataDeserializationCluster() { }
  virtual ~RedirectionDataDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         RedirectionData::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawRedirectionData* data =
          reinterpret_cast<RawRedirectionData*>(d->Ref(id));
      Deserializer::InitializeHeader(data, kRedirectionDataCid,
                                     RedirectionData::InstanceSize(),
                                     is_vm_object);
      RawObject** from = data->from();
      RawObject** to = data->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class FieldSerializationCluster : public SerializationCluster {
 public:
  FieldSerializationCluster() { }
  virtual ~FieldSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawField* field = Field::RawCast(object);
    objects_.Add(field);

    Snapshot::Kind kind = s->kind();

    s->Push(field->ptr()->name_);
    s->Push(field->ptr()->owner_);
    s->Push(field->ptr()->type_);
    // Write out the initial static value or field offset.
    if (Field::StaticBit::decode(field->ptr()->kind_bits_)) {
      if (kind == Snapshot::kAppNoJIT) {
        // For precompiled static fields, the value was already reset and
        // initializer_ now contains a Function.
        s->Push(field->ptr()->value_.static_value_);
      } else if (Field::ConstBit::decode(field->ptr()->kind_bits_)) {
        // Do not reset const fields.
        s->Push(field->ptr()->value_.static_value_);
      } else {
        // Otherwise, for static fields we write out the initial static value.
        s->Push(field->ptr()->initializer_.saved_value_);
      }
    } else {
      s->Push(field->ptr()->value_.offset_);
    }
    // Write out the initializer function or saved initial value.
    if (kind == Snapshot::kAppNoJIT) {
      s->Push(field->ptr()->initializer_.precompiled_);
    } else {
      s->Push(field->ptr()->initializer_.saved_value_);
    }
    if (kind != Snapshot::kAppNoJIT) {
      // Write out the guarded list length.
      s->Push(field->ptr()->guarded_list_length_);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kFieldCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawField* field = objects_[i];
      s->AssignRef(field);
    }
  }

  void WriteFill(Serializer* s) {
    Snapshot::Kind kind = s->kind();
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawField* field = objects_[i];

      s->WriteRef(field->ptr()->name_);
      s->WriteRef(field->ptr()->owner_);
      s->WriteRef(field->ptr()->type_);
      // Write out the initial static value or field offset.
      if (Field::StaticBit::decode(field->ptr()->kind_bits_)) {
        if (kind == Snapshot::kAppNoJIT) {
          // For precompiled static fields, the value was already reset and
          // initializer_ now contains a Function.
          s->WriteRef(field->ptr()->value_.static_value_);
        } else if (Field::ConstBit::decode(field->ptr()->kind_bits_)) {
          // Do not reset const fields.
          s->WriteRef(field->ptr()->value_.static_value_);
        } else {
          // Otherwise, for static fields we write out the initial static value.
          s->WriteRef(field->ptr()->initializer_.saved_value_);
        }
      } else {
        s->WriteRef(field->ptr()->value_.offset_);
      }
      // Write out the initializer function or saved initial value.
      if (kind == Snapshot::kAppNoJIT) {
        s->WriteRef(field->ptr()->initializer_.precompiled_);
      } else {
        s->WriteRef(field->ptr()->initializer_.saved_value_);
      }
      if (kind != Snapshot::kAppNoJIT) {
        // Write out the guarded list length.
        s->WriteRef(field->ptr()->guarded_list_length_);
      }

      if (kind != Snapshot::kAppNoJIT) {
        s->WriteTokenPosition(field->ptr()->token_pos_);
        s->WriteCid(field->ptr()->guarded_cid_);
        s->WriteCid(field->ptr()->is_nullable_);
      }
      s->Write<uint8_t>(field->ptr()->kind_bits_);
    }
  }

 private:
  GrowableArray<RawField*> objects_;
};


class FieldDeserializationCluster : public DeserializationCluster {
 public:
  FieldDeserializationCluster() { }
  virtual ~FieldDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Field::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    Snapshot::Kind kind = d->kind();
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawField* field = reinterpret_cast<RawField*>(d->Ref(id));
      Deserializer::InitializeHeader(field, kFieldCid,
                                     Field::InstanceSize(), is_vm_object);
      RawObject** from = field->from();
      RawObject** to_snapshot = field->to_snapshot(kind);
      RawObject** to = field->to();
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }
      for (RawObject** p = to_snapshot + 1; p <= to; p++) {
        *p = Object::null();
      }

      if (kind != Snapshot::kAppNoJIT) {
        field->ptr()->token_pos_ = d->ReadTokenPosition();
        field->ptr()->guarded_cid_ = d->ReadCid();
        field->ptr()->is_nullable_ = d->ReadCid();
      }
      field->ptr()->kind_bits_ = d->Read<uint8_t>();
    }
  }

  void PostLoad(const Array& refs, Snapshot::Kind kind, Zone* zone) {
    NOT_IN_PRODUCT(TimelineDurationScope tds(Thread::Current(),
        Timeline::GetIsolateStream(), "PostLoadField"));

    Field& field = Field::Handle(zone);
    if (!FLAG_use_field_guards) {
      for (intptr_t i = start_index_; i < stop_index_; i++) {
        field ^= refs.At(i);
        field.set_guarded_cid(kDynamicCid);
        field.set_is_nullable(true);
        field.set_guarded_list_length(Field::kNoFixedLength);
        field.set_guarded_list_length_in_object_offset(
            Field::kUnknownLengthOffset);
      }
    } else {
      for (intptr_t i = start_index_; i < stop_index_; i++) {
        field ^= refs.At(i);
        field.InitializeGuardedListLengthInObjectOffset();
      }
    }
  }
};


class LiteralTokenSerializationCluster : public SerializationCluster {
 public:
  LiteralTokenSerializationCluster() { }
  virtual ~LiteralTokenSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawLiteralToken* token = LiteralToken::RawCast(object);
    objects_.Add(token);

    RawObject** from = token->from();
    RawObject** to = token->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kLiteralTokenCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawLiteralToken* token = objects_[i];
      s->AssignRef(token);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawLiteralToken* token = objects_[i];
      RawObject** from = token->from();
      RawObject** to = token->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->Write<int32_t>(token->ptr()->kind_);
    }
  }

 private:
  GrowableArray<RawLiteralToken*> objects_;
};


class LiteralTokenDeserializationCluster : public DeserializationCluster {
 public:
  LiteralTokenDeserializationCluster() { }
  virtual ~LiteralTokenDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         LiteralToken::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawLiteralToken* token = reinterpret_cast<RawLiteralToken*>(d->Ref(id));
      Deserializer::InitializeHeader(token, kLiteralTokenCid,
                                     LiteralToken::InstanceSize(),
                                     is_vm_object);
      RawObject** from = token->from();
      RawObject** to = token->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      token->ptr()->kind_ = static_cast<Token::Kind>(d->Read<int32_t>());
    }
  }
};


class TokenStreamSerializationCluster : public SerializationCluster {
 public:
  TokenStreamSerializationCluster() { }
  virtual ~TokenStreamSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawTokenStream* stream = TokenStream::RawCast(object);
    objects_.Add(stream);

    RawObject** from = stream->from();
    RawObject** to = stream->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kTokenStreamCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawTokenStream* stream = objects_[i];
      s->AssignRef(stream);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawTokenStream* stream = objects_[i];
      RawObject** from = stream->from();
      RawObject** to = stream->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawTokenStream*> objects_;
};


class TokenStreamDeserializationCluster : public DeserializationCluster {
 public:
  TokenStreamDeserializationCluster() { }
  virtual ~TokenStreamDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         TokenStream::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawTokenStream* stream = reinterpret_cast<RawTokenStream*>(d->Ref(id));
      Deserializer::InitializeHeader(stream, kTokenStreamCid,
                                     TokenStream::InstanceSize(), is_vm_object);
      RawObject** from = stream->from();
      RawObject** to = stream->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class ScriptSerializationCluster : public SerializationCluster {
 public:
  ScriptSerializationCluster() { }
  virtual ~ScriptSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawScript* script = Script::RawCast(object);
    objects_.Add(script);

    RawObject** from = script->from();
    RawObject** to = script->to_snapshot(s->kind());
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kScriptCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawScript* script = objects_[i];
      s->AssignRef(script);
    }
  }

  void WriteFill(Serializer* s) {
    Snapshot::Kind kind = s->kind();
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawScript* script = objects_[i];
      RawObject** from = script->from();
      RawObject** to = script->to_snapshot(kind);
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }

      s->Write<int32_t>(script->ptr()->line_offset_);
      s->Write<int32_t>(script->ptr()->col_offset_);
      s->Write<int8_t>(script->ptr()->kind_);
    }
  }

 private:
  GrowableArray<RawScript*> objects_;
};


class ScriptDeserializationCluster : public DeserializationCluster {
 public:
  ScriptDeserializationCluster() { }
  virtual ~ScriptDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Script::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    Snapshot::Kind kind = d->kind();
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawScript* script = reinterpret_cast<RawScript*>(d->Ref(id));
      Deserializer::InitializeHeader(script, kScriptCid,
                                     Script::InstanceSize(), is_vm_object);
      RawObject** from = script->from();
      RawObject** to_snapshot = script->to_snapshot(kind);
      RawObject** to = script->to();
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }
      for (RawObject** p = to_snapshot + 1; p <= to; p++) {
        *p = Object::null();
      }

      script->ptr()->line_offset_ = d->Read<int32_t>();
      script->ptr()->col_offset_ = d->Read<int32_t>();
      script->ptr()->kind_ = d->Read<int8_t>();
      script->ptr()->load_timestamp_ = 0;
    }
  }
};


class LibrarySerializationCluster : public SerializationCluster {
 public:
  LibrarySerializationCluster() { }
  virtual ~LibrarySerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawLibrary* lib = Library::RawCast(object);
    objects_.Add(lib);

    RawObject** from = lib->from();
    RawObject** to = lib->to_snapshot();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kLibraryCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawLibrary* lib = objects_[i];
      s->AssignRef(lib);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawLibrary* lib = objects_[i];
      RawObject** from = lib->from();
      RawObject** to = lib->to_snapshot();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }

      s->Write<int32_t>(lib->ptr()->index_);
      s->Write<uint16_t>(lib->ptr()->num_imports_);
      s->Write<int8_t>(lib->ptr()->load_state_);
      s->Write<bool>(lib->ptr()->corelib_imported_);
      s->Write<bool>(lib->ptr()->is_dart_scheme_);
      s->Write<bool>(lib->ptr()->debuggable_);
    }
  }

 private:
  GrowableArray<RawLibrary*> objects_;
};

class LibraryDeserializationCluster : public DeserializationCluster {
 public:
  LibraryDeserializationCluster() { }
  virtual ~LibraryDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Library::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawLibrary* lib = reinterpret_cast<RawLibrary*>(d->Ref(id));
      Deserializer::InitializeHeader(lib, kLibraryCid,
                                     Library::InstanceSize(), is_vm_object);
      RawObject** from = lib->from();
      RawObject** to_snapshot = lib->to_snapshot();
      RawObject** to = lib->to();
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }
      for (RawObject** p = to_snapshot + 1; p <= to; p++) {
        *p = Object::null();
      }

      lib->ptr()->native_entry_resolver_ = NULL;
      lib->ptr()->native_entry_symbol_resolver_ = NULL;
      lib->ptr()->index_ = d->Read<int32_t>();
      lib->ptr()->num_imports_ = d->Read<uint16_t>();
      lib->ptr()->load_state_ = d->Read<int8_t>();
      lib->ptr()->corelib_imported_ = d->Read<bool>();
      lib->ptr()->is_dart_scheme_ = d->Read<bool>();
      lib->ptr()->debuggable_ = d->Read<bool>();
      lib->ptr()->is_in_fullsnapshot_ = true;
    }
  }

  void PostLoad(const Array& refs, Snapshot::Kind kind, Zone* zone) {
    // TODO(rmacnak): This is surprisingly slow, roughly 20% of deserialization
    // time for the JIT. Maybe make the lookups happy with a null?

    NOT_IN_PRODUCT(TimelineDurationScope tds(Thread::Current(),
        Timeline::GetIsolateStream(), "PostLoadLibrary"));

    Library& lib = Library::Handle(zone);
    for (intptr_t i = start_index_; i < stop_index_; i++) {
      lib ^= refs.At(i);
      const intptr_t kInitialNameCacheSize = 64;
      lib.InitResolvedNamesCache(kInitialNameCacheSize);
    }
  }
};


class NamespaceSerializationCluster : public SerializationCluster {
 public:
  NamespaceSerializationCluster() { }
  virtual ~NamespaceSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawNamespace* ns = Namespace::RawCast(object);
    objects_.Add(ns);

    RawObject** from = ns->from();
    RawObject** to = ns->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kNamespaceCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawNamespace* ns = objects_[i];
      s->AssignRef(ns);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawNamespace* ns = objects_[i];
      RawObject** from = ns->from();
      RawObject** to = ns->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawNamespace*> objects_;
};


class NamespaceDeserializationCluster : public DeserializationCluster {
 public:
  NamespaceDeserializationCluster() { }
  virtual ~NamespaceDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Namespace::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawNamespace* ns = reinterpret_cast<RawNamespace*>(d->Ref(id));
      Deserializer::InitializeHeader(ns, kNamespaceCid,
                                     Namespace::InstanceSize(), is_vm_object);
      RawObject** from = ns->from();
      RawObject** to = ns->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class CodeSerializationCluster : public SerializationCluster {
 public:
  CodeSerializationCluster() { }
  virtual ~CodeSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawCode* code = Code::RawCast(object);
    objects_.Add(code);

    s->Push(code->ptr()->object_pool_);
    s->Push(code->ptr()->owner_);
    s->Push(code->ptr()->exception_handlers_);
    s->Push(code->ptr()->pc_descriptors_);
    s->Push(code->ptr()->stackmaps_);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kCodeCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawCode* code = objects_[i];
      s->AssignRef(code);
    }
  }

  void WriteFill(Serializer* s) {
    Snapshot::Kind kind = s->kind();
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawCode* code = objects_[i];

      intptr_t pointer_offsets_length =
          Code::PtrOffBits::decode(code->ptr()->state_bits_);
      if (pointer_offsets_length != 0) {
        FATAL("Cannot serialize code with embedded pointers");
      }
      if (kind == Snapshot::kAppNoJIT) {
        // No disabled code in precompilation.
        ASSERT(code->ptr()->instructions_ == code->ptr()->active_instructions_);
      } else {
        ASSERT(kind == Snapshot::kAppWithJIT);
        // We never include optimized code in JIT precompilation. Deoptimization
        // requires code patching and we cannot patch code that is shared
        // between isolates and should not mutate memory allocated by the
        // embedder.
        bool is_optimized = Code::PtrOffBits::decode(code->ptr()->state_bits_);
        if (is_optimized) {
          FATAL("Cannot include optimized code in a JIT snapshot");
        }
      }

      RawInstructions* instr = code->ptr()->instructions_;
      int32_t text_offset = s->GetTextOffset(instr, code);
      s->Write<int32_t>(text_offset);

      s->WriteRef(code->ptr()->object_pool_);
      s->WriteRef(code->ptr()->owner_);
      s->WriteRef(code->ptr()->exception_handlers_);
      s->WriteRef(code->ptr()->pc_descriptors_);
      s->WriteRef(code->ptr()->stackmaps_);

      s->Write<int32_t>(code->ptr()->state_bits_);
    }
  }

 private:
  GrowableArray<RawCode*> objects_;
};


class CodeDeserializationCluster : public DeserializationCluster {
 public:
  CodeDeserializationCluster() { }
  virtual ~CodeDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Code::InstanceSize(0)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawCode* code = reinterpret_cast<RawCode*>(d->Ref(id));
      Deserializer::InitializeHeader(code, kCodeCid,
                                     Code::InstanceSize(0), is_vm_object);

      int32_t text_offset = d->Read<int32_t>();
      RawInstructions* instr = reinterpret_cast<RawInstructions*>(
          d->GetInstructionsAt(text_offset) + kHeapObjectTag);
      uword entry_point = Instructions::EntryPoint(instr);

      code->ptr()->entry_point_ = entry_point;
      code->ptr()->active_instructions_ = instr;
      code->ptr()->instructions_ = instr;
      code->ptr()->object_pool_ =
          reinterpret_cast<RawObjectPool*>(d->ReadRef());
      code->ptr()->owner_ = d->ReadRef();
      code->ptr()->exception_handlers_ =
          reinterpret_cast<RawExceptionHandlers*>(d->ReadRef());
      code->ptr()->pc_descriptors_ =
          reinterpret_cast<RawPcDescriptors*>(d->ReadRef());
      code->ptr()->stackmaps_ =
          reinterpret_cast<RawArray*>(d->ReadRef());

      code->ptr()->deopt_info_array_ = Array::null();
      code->ptr()->static_calls_target_table_ = Array::null();
      code->ptr()->var_descriptors_ = LocalVarDescriptors::null();
      code->ptr()->inlined_metadata_ = Array::null();
      code->ptr()->code_source_map_ = CodeSourceMap::null();
      code->ptr()->comments_ = Array::null();
      code->ptr()->return_address_metadata_ = Object::null();

      code->ptr()->compile_timestamp_ = 0;
      code->ptr()->state_bits_ = d->Read<int32_t>();
      code->ptr()->lazy_deopt_pc_offset_ = -1;
    }
  }
};


class ObjectPoolSerializationCluster : public SerializationCluster {
 public:
  ObjectPoolSerializationCluster() { }
  virtual ~ObjectPoolSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawObjectPool* pool = ObjectPool::RawCast(object);
    objects_.Add(pool);

    intptr_t length = pool->ptr()->length_;
    RawTypedData* info_array = pool->ptr()->info_array_;

    for (intptr_t i = 0; i < length; i++) {
      ObjectPool::EntryType entry_type =
          static_cast<ObjectPool::EntryType>(info_array->ptr()->data()[i]);
      if (entry_type == ObjectPool::kTaggedObject) {
        s->Push(pool->ptr()->data()[i].raw_obj_);
      }
    }

    // TODO(rmacnak): Allocate the object pool and its info array together.
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kObjectPoolCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawObjectPool* pool = objects_[i];
      intptr_t length = pool->ptr()->length_;
      s->Write<intptr_t>(length);
      s->AssignRef(pool);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawObjectPool* pool = objects_[i];
      RawTypedData* info_array = pool->ptr()->info_array_;
      intptr_t length = pool->ptr()->length_;
      s->Write<intptr_t>(length);
      for (intptr_t j = 0; j < length; j++) {
        ObjectPool::EntryType entry_type =
            static_cast<ObjectPool::EntryType>(info_array->ptr()->data()[j]);
        s->Write<int8_t>(entry_type);
        RawObjectPool::Entry& entry = pool->ptr()->data()[j];
        switch (entry_type) {
          case ObjectPool::kTaggedObject: {
#if !defined(TARGET_ARCH_DBC)
            if (entry.raw_obj_ ==
                StubCode::CallNativeCFunction_entry()->code()) {
              // Natives can run while precompiling, becoming linked and
              // switching their stub. Reset to the initial stub used for
              // lazy-linking.
              s->WriteRef(StubCode::CallBootstrapCFunction_entry()->code());
              break;
            }
#endif
          s->WriteRef(entry.raw_obj_);
          break;
        }
        case ObjectPool::kImmediate: {
          s->Write<intptr_t>(entry.raw_value_);
          break;
        }
        case ObjectPool::kNativeEntry: {
          // Write nothing. Will initialize with the lazy link entry.
#if defined(TARGET_ARCH_DBC)
          UNREACHABLE();   // DBC does not support lazy native call linking.
#endif
          break;
        }
        default:
          UNREACHABLE();
        }
      }
    }
  }

 private:
  GrowableArray<RawObjectPool*> objects_;
};


class ObjectPoolDeserializationCluster : public DeserializationCluster {
 public:
  ObjectPoolDeserializationCluster() { }
  virtual ~ObjectPoolDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         ObjectPool::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();
    PageSpace* old_space = d->heap()->old_space();
    for (intptr_t id = start_index_; id < stop_index_; id += 1) {
      intptr_t length = d->Read<intptr_t>();
      RawTypedData* info_array = reinterpret_cast<RawTypedData*>(
          AllocateUninitialized(old_space, TypedData::InstanceSize(length)));
      Deserializer::InitializeHeader(info_array, kTypedDataUint8ArrayCid,
                                     TypedData::InstanceSize(length),
                                     is_vm_object);
      info_array->ptr()->length_ = Smi::New(length);
      RawObjectPool* pool = reinterpret_cast<RawObjectPool*>(d->Ref(id + 0));
      Deserializer::InitializeHeader(pool, kObjectPoolCid,
                                     ObjectPool::InstanceSize(length),
                                     is_vm_object);
      pool->ptr()->length_ = length;
      pool->ptr()->info_array_ = info_array;
      for (intptr_t j = 0; j < length; j++) {
        ObjectPool::EntryType entry_type =
            static_cast<ObjectPool::EntryType>(d->Read<int8_t>());
        info_array->ptr()->data()[j] = entry_type;
        RawObjectPool::Entry& entry = pool->ptr()->data()[j];
        switch (entry_type) {
          case ObjectPool::kTaggedObject:
            entry.raw_obj_ = d->ReadRef();
            break;
          case ObjectPool::kImmediate:
            entry.raw_value_ = d->Read<intptr_t>();
            break;
          case ObjectPool::kNativeEntry: {
#if !defined(TARGET_ARCH_DBC)
            // Read nothing. Initialize with the lazy link entry.
            uword new_entry = NativeEntry::LinkNativeCallEntry();
            entry.raw_value_ = static_cast<intptr_t>(new_entry);
#else
            UNREACHABLE();  // DBC does not support lazy native call linking.
#endif
            break;
          }
          default:
            UNREACHABLE();
        }
      }
    }
  }
};


// PcDescriptor, Stackmap, OneByteString, TwoByteString
class RODataSerializationCluster : public SerializationCluster {
 public:
  explicit RODataSerializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~RODataSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    objects_.Add(object);

    // A string's hash must already be computed when we write it because it
    // will be loaded into read-only memory.
    if (cid_ == kOneByteStringCid) {
      RawOneByteString* str = static_cast<RawOneByteString*>(object);
      if (str->ptr()->hash_ == Smi::New(0)) {
        intptr_t hash = String::Hash(str->ptr()->data(),
                                     Smi::Value(str->ptr()->length_));
        str->ptr()->hash_ = Smi::New(hash);
      }
      ASSERT(str->ptr()->hash_ != Smi::New(0));
    } else if (cid_ == kTwoByteStringCid) {
      RawTwoByteString* str = static_cast<RawTwoByteString*>(object);
      if (str->ptr()->hash_ == Smi::New(0)) {
        intptr_t hash = String::Hash(str->ptr()->data(),
                                     Smi::Value(str->ptr()->length_) * 2);
        str->ptr()->hash_ = Smi::New(hash);
      }
      ASSERT(str->ptr()->hash_ != Smi::New(0));
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(cid_);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawObject* object = objects_[i];
      int32_t rodata_offset = s->GetRODataOffset(object);
      s->Write<int32_t>(rodata_offset);
      s->AssignRef(object);
    }
  }

  void WriteFill(Serializer* s) {
    // No-op.
  }

 private:
  const intptr_t cid_;
  GrowableArray<RawObject*> objects_;
};


class RODataDeserializationCluster : public DeserializationCluster {
 public:
  RODataDeserializationCluster() { }
  virtual ~RODataDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      int32_t rodata_offset = d->Read<int32_t>();
      d->AssignRef(d->GetObjectAt(rodata_offset));
    }
  }

  void ReadFill(Deserializer* d) {
    // No-op.
  }
};


class LocalVarDescriptorsSerializationCluster : public SerializationCluster {
 public:
  LocalVarDescriptorsSerializationCluster() { }
  virtual ~LocalVarDescriptorsSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) { UNIMPLEMENTED(); }
  void WriteAlloc(Serializer* s) {}
  void WriteFill(Serializer* s) {}

 private:
  GrowableArray<RawClass*> objects_;
};


class ExceptionHandlersSerializationCluster : public SerializationCluster {
 public:
  ExceptionHandlersSerializationCluster() { }
  virtual ~ExceptionHandlersSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawExceptionHandlers* handlers = ExceptionHandlers::RawCast(object);
    objects_.Add(handlers);

    s->Push(handlers->ptr()->handled_types_data_);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kExceptionHandlersCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawExceptionHandlers* handlers = objects_[i];
      intptr_t length = handlers->ptr()->num_entries_;
      s->Write<intptr_t>(length);
      s->AssignRef(handlers);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawExceptionHandlers* handlers = objects_[i];
      intptr_t length = handlers->ptr()->num_entries_;
      s->Write<intptr_t>(length);
      s->WriteRef(handlers->ptr()->handled_types_data_);

      uint8_t* data = reinterpret_cast<uint8_t*>(handlers->ptr()->data());
      intptr_t length_in_bytes =
          length * sizeof(RawExceptionHandlers::HandlerInfo);
      s->WriteBytes(data, length_in_bytes);
    }
  }

 private:
  GrowableArray<RawExceptionHandlers*> objects_;
};


class ExceptionHandlersDeserializationCluster : public DeserializationCluster {
 public:
  ExceptionHandlersDeserializationCluster() { }
  virtual ~ExceptionHandlersDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
          ExceptionHandlers::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawExceptionHandlers* handlers =
          reinterpret_cast<RawExceptionHandlers*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      Deserializer::InitializeHeader(handlers, kExceptionHandlersCid,
                                     ExceptionHandlers::InstanceSize(length),
                                     is_vm_object);
      handlers->ptr()->num_entries_ = length;
      handlers->ptr()->handled_types_data_ =
          reinterpret_cast<RawArray*>(d->ReadRef());

      uint8_t* data = reinterpret_cast<uint8_t*>(handlers->ptr()->data());
      intptr_t length_in_bytes =
          length * sizeof(RawExceptionHandlers::HandlerInfo);
      d->ReadBytes(data, length_in_bytes);
    }
  }
};

class ContextSerializationCluster : public SerializationCluster {
 public:
  ContextSerializationCluster() { }
  virtual ~ContextSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawContext* context = Context::RawCast(object);
    objects_.Add(context);

    s->Push(context->ptr()->parent_);
    intptr_t length = context->ptr()->num_variables_;
    for (intptr_t i = 0; i < length; i++) {
      s->Push(context->ptr()->data()[i]);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kContextCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawContext* context = objects_[i];
      intptr_t length = context->ptr()->num_variables_;
      s->Write<intptr_t>(length);
      s->AssignRef(context);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawContext* context = objects_[i];
      intptr_t length = context->ptr()->num_variables_;
      s->Write<intptr_t>(length);
      s->WriteRef(context->ptr()->parent_);
      for (intptr_t j = 0; j < length; j++) {
        s->WriteRef(context->ptr()->data()[j]);
      }
    }
  }

 private:
  GrowableArray<RawContext*> objects_;
};


class ContextDeserializationCluster : public DeserializationCluster {
 public:
  ContextDeserializationCluster() { }
  virtual ~ContextDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         Context::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawContext* context = reinterpret_cast<RawContext*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      Deserializer::InitializeHeader(context, kContextCid,
                                     Context::InstanceSize(length),
                                     is_vm_object);
      context->ptr()->num_variables_ = length;
      context->ptr()->parent_ = reinterpret_cast<RawContext*>(d->ReadRef());
      for (intptr_t j = 0; j < length; j++) {
        context->ptr()->data()[j] = d->ReadRef();
      }
    }
  }
};


class ContextScopeSerializationCluster : public SerializationCluster {
 public:
  ContextScopeSerializationCluster() { }
  virtual ~ContextScopeSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawContextScope* scope = ContextScope::RawCast(object);
    objects_.Add(scope);

    intptr_t length = scope->ptr()->num_variables_;
    RawObject** from = scope->from();
    RawObject** to = scope->to(length);
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kContextScopeCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawContextScope* scope = objects_[i];
      intptr_t length = scope->ptr()->num_variables_;
      s->Write<intptr_t>(length);
      s->AssignRef(scope);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawContextScope* scope = objects_[i];
      intptr_t length = scope->ptr()->num_variables_;
      s->Write<intptr_t>(length);
      s->Write<bool>(scope->ptr()->is_implicit_);
      RawObject** from = scope->from();
      RawObject** to = scope->to(length);
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawContextScope*> objects_;
};


class ContextScopeDeserializationCluster : public DeserializationCluster {
 public:
  ContextScopeDeserializationCluster() { }
  virtual ~ContextScopeDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         ContextScope::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawContextScope* scope = reinterpret_cast<RawContextScope*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      Deserializer::InitializeHeader(scope, kContextScopeCid,
                                     ContextScope::InstanceSize(length),
                                     is_vm_object);
      scope->ptr()->num_variables_ = length;
      scope->ptr()->is_implicit_ = d->Read<bool>();
      RawObject** from = scope->from();
      RawObject** to = scope->to(length);
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class ICDataSerializationCluster : public SerializationCluster {
 public:
  ICDataSerializationCluster() { }
  virtual ~ICDataSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawICData* ic = ICData::RawCast(object);
    objects_.Add(ic);

    RawObject** from = ic->from();
    RawObject** to = ic->to_snapshot(s->kind());
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kICDataCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawICData* ic = objects_[i];
      s->AssignRef(ic);
    }
  }

  void WriteFill(Serializer* s) {
    Snapshot::Kind kind = s->kind();
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawICData* ic = objects_[i];
      RawObject** from = ic->from();
      RawObject** to = ic->to_snapshot(kind);
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->Write<int32_t>(ic->ptr()->deopt_id_);
      s->Write<uint32_t>(ic->ptr()->state_bits_);
#if defined(TAG_IC_DATA)
      s->Write<intptr_t>(ic->ptr()->tag_);
#endif
    }
  }

 private:
  GrowableArray<RawICData*> objects_;
};


class ICDataDeserializationCluster : public DeserializationCluster {
 public:
  ICDataDeserializationCluster() { }
  virtual ~ICDataDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, ICData::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    Snapshot::Kind kind = d->kind();
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawICData* ic = reinterpret_cast<RawICData*>(d->Ref(id));
      Deserializer::InitializeHeader(ic, kICDataCid,
                                     ICData::InstanceSize(), is_vm_object);
      RawObject** from = ic->from();
      RawObject** to_snapshot = ic->to_snapshot(kind);
      RawObject** to = ic->to();
      for (RawObject** p = from; p <= to_snapshot; p++) {
        *p = d->ReadRef();
      }
      for (RawObject** p = to_snapshot + 1; p <= to; p++) {
        *p = Object::null();
      }
      ic->ptr()->deopt_id_ = d->Read<int32_t>();
      ic->ptr()->state_bits_ = d->Read<int32_t>();
#if defined(TAG_IC_DATA)
      ic->ptr()->tag_ = d->Read<intptr_t>();
#endif
    }
  }

  void PostLoad(const Array& refs, Snapshot::Kind kind, Zone* zone) {
    NOT_IN_PRODUCT(TimelineDurationScope tds(Thread::Current(),
        Timeline::GetIsolateStream(), "PostLoadICData"));

    if (kind == Snapshot::kAppNoJIT) {
      ICData& ic = ICData::Handle(zone);
      Object& funcOrCode = Object::Handle(zone);
      Code& code = Code::Handle(zone);
      Smi& entry_point = Smi::Handle(zone);
      for (intptr_t i = start_index_; i < stop_index_; i++) {
        ic ^= refs.At(i);
        for (intptr_t j = 0; j < ic.NumberOfChecks(); j++) {
          funcOrCode = ic.GetTargetOrCodeAt(j);
          if (funcOrCode.IsCode()) {
            code ^= funcOrCode.raw();
            entry_point = Smi::FromAlignedAddress(code.EntryPoint());
            ic.SetEntryPointAt(j, entry_point);
          }
        }
      }
    }
  }
};


class MegamorphicCacheSerializationCluster : public SerializationCluster {
 public:
  MegamorphicCacheSerializationCluster() { }
  virtual ~MegamorphicCacheSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawMegamorphicCache* cache = MegamorphicCache::RawCast(object);
    objects_.Add(cache);

    RawObject** from = cache->from();
    RawObject** to = cache->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kMegamorphicCacheCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawMegamorphicCache* cache = objects_[i];
      s->AssignRef(cache);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawMegamorphicCache* cache = objects_[i];
      RawObject** from = cache->from();
      RawObject** to = cache->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->Write<int32_t>(cache->ptr()->filled_entry_count_);
    }
  }

 private:
  GrowableArray<RawMegamorphicCache*> objects_;
};


class MegamorphicCacheDeserializationCluster : public DeserializationCluster {
 public:
  MegamorphicCacheDeserializationCluster() { }
  virtual ~MegamorphicCacheDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         MegamorphicCache::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawMegamorphicCache* cache =
            reinterpret_cast<RawMegamorphicCache*>(d->Ref(id));
      Deserializer::InitializeHeader(cache, kMegamorphicCacheCid,
                                     MegamorphicCache::InstanceSize(),
                                     is_vm_object);
      RawObject** from = cache->from();
      RawObject** to = cache->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      cache->ptr()->filled_entry_count_ = d->Read<int32_t>();
    }
  }
};


class SubtypeTestCacheSerializationCluster : public SerializationCluster {
 public:
  SubtypeTestCacheSerializationCluster() { }
  virtual ~SubtypeTestCacheSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawSubtypeTestCache* cache = SubtypeTestCache::RawCast(object);
    objects_.Add(cache);
    s->Push(cache->ptr()->cache_);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kSubtypeTestCacheCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawSubtypeTestCache* cache = objects_[i];
      s->AssignRef(cache);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawSubtypeTestCache* cache = objects_[i];
      s->WriteRef(cache->ptr()->cache_);
    }
  }

 private:
  GrowableArray<RawSubtypeTestCache*> objects_;
};


class SubtypeTestCacheDeserializationCluster : public DeserializationCluster {
 public:
  SubtypeTestCacheDeserializationCluster() { }
  virtual ~SubtypeTestCacheDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         SubtypeTestCache::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawSubtypeTestCache* cache =
          reinterpret_cast<RawSubtypeTestCache*>(d->Ref(id));
      Deserializer::InitializeHeader(cache, kSubtypeTestCacheCid,
                                     SubtypeTestCache::InstanceSize(),
                                     is_vm_object);
      cache->ptr()->cache_ = reinterpret_cast<RawArray*>(d->ReadRef());
    }
  }
};


class LanguageErrorSerializationCluster : public SerializationCluster {
 public:
  LanguageErrorSerializationCluster() { }
  virtual ~LanguageErrorSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawLanguageError* error = LanguageError::RawCast(object);
    objects_.Add(error);

    RawObject** from = error->from();
    RawObject** to = error->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kLanguageErrorCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawLanguageError* error = objects_[i];
      s->AssignRef(error);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawLanguageError* error = objects_[i];
      RawObject** from = error->from();
      RawObject** to = error->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->WriteTokenPosition(error->ptr()->token_pos_);
      s->Write<bool>(error->ptr()->report_after_token_);
      s->Write<int8_t>(error->ptr()->kind_);
    }
  }

 private:
  GrowableArray<RawLanguageError*> objects_;
};


class LanguageErrorDeserializationCluster : public DeserializationCluster {
 public:
  LanguageErrorDeserializationCluster() { }
  virtual ~LanguageErrorDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         LanguageError::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawLanguageError* error = reinterpret_cast<RawLanguageError*>(d->Ref(id));
      Deserializer::InitializeHeader(error, kLanguageErrorCid,
                                     LanguageError::InstanceSize(),
                                     is_vm_object);
      RawObject** from = error->from();
      RawObject** to = error->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      error->ptr()->token_pos_ = d->ReadTokenPosition();
      error->ptr()->report_after_token_ = d->Read<bool>();
      error->ptr()->kind_ = d->Read<int8_t>();
    }
  }
};


class UnhandledExceptionSerializationCluster : public SerializationCluster {
 public:
  UnhandledExceptionSerializationCluster() { }
  virtual ~UnhandledExceptionSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawUnhandledException* exception = UnhandledException::RawCast(object);
    objects_.Add(exception);

    RawObject** from = exception->from();
    RawObject** to = exception->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kUnhandledExceptionCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawUnhandledException* exception = objects_[i];
      s->AssignRef(exception);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawUnhandledException* exception = objects_[i];
      RawObject** from = exception->from();
      RawObject** to = exception->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawUnhandledException*> objects_;
};


class UnhandledExceptionDeserializationCluster : public DeserializationCluster {
 public:
  UnhandledExceptionDeserializationCluster() { }
  virtual ~UnhandledExceptionDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         UnhandledException::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawUnhandledException* exception =
          reinterpret_cast<RawUnhandledException*>(d->Ref(id));
      Deserializer::InitializeHeader(exception, kUnhandledExceptionCid,
                                     UnhandledException::InstanceSize(),
                                     is_vm_object);
      RawObject** from = exception->from();
      RawObject** to = exception->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class InstanceSerializationCluster : public SerializationCluster {
 public:
  explicit InstanceSerializationCluster(intptr_t cid) : cid_(cid) {
    RawClass* cls = Isolate::Current()->class_table()->At(cid);
    next_field_offset_ =
        cls->ptr()->next_field_offset_in_words_ << kWordSizeLog2;
    instance_size_in_words_ = cls->ptr()->instance_size_in_words_;
    ASSERT(next_field_offset_ > 0);
    ASSERT(instance_size_in_words_ > 0);
  }
  virtual ~InstanceSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawInstance* instance = Instance::RawCast(object);
    objects_.Add(instance);

    intptr_t offset = Instance::NextFieldOffset();
    while (offset < next_field_offset_) {
      RawObject* raw_obj = *reinterpret_cast<RawObject**>(
          reinterpret_cast<uword>(instance->ptr()) + offset);
      s->Push(raw_obj);
      offset += kWordSize;
    }
  }

  void WriteAlloc(Serializer* s) {
    s->Write<intptr_t>(cid_);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);

    s->Write<intptr_t>(next_field_offset_);
    s->Write<intptr_t>(instance_size_in_words_);

    for (intptr_t i = 0; i < count; i++) {
      RawInstance* instance = objects_[i];
      s->AssignRef(instance);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawInstance* instance = objects_[i];
      s->Write<bool>(instance->IsCanonical());
      intptr_t offset = Instance::NextFieldOffset();
      while (offset < next_field_offset_) {
        RawObject* raw_obj = *reinterpret_cast<RawObject**>(
            reinterpret_cast<uword>(instance->ptr()) + offset);
        s->WriteRef(raw_obj);
        offset += kWordSize;
      }
    }
  }

 private:
  const intptr_t cid_;
  intptr_t next_field_offset_;
  intptr_t instance_size_in_words_;
  GrowableArray<RawInstance*> objects_;
};


class InstanceDeserializationCluster : public DeserializationCluster {
 public:
  explicit InstanceDeserializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~InstanceDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    next_field_offset_  = d->Read<intptr_t>();
    instance_size_in_words_  = d->Read<intptr_t>();
    intptr_t instance_size =
        Object::RoundedAllocationSize(instance_size_in_words_ * kWordSize);
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, instance_size));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    intptr_t instance_size =
        Object::RoundedAllocationSize(instance_size_in_words_ * kWordSize);
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawInstance* instance = reinterpret_cast<RawInstance*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(instance, cid_,
                                     instance_size,
                                     is_vm_object, is_canonical);
      intptr_t offset = Instance::NextFieldOffset();
      while (offset < next_field_offset_) {
        RawObject** p = reinterpret_cast<RawObject**>(
            reinterpret_cast<uword>(instance->ptr()) + offset);
        *p = d->ReadRef();
        offset += kWordSize;
      }
      if (offset < instance_size) {
        RawObject** p = reinterpret_cast<RawObject**>(
            reinterpret_cast<uword>(instance->ptr()) + offset);
        *p = Object::null();
        offset += kWordSize;
      }
      ASSERT(offset == instance_size);
    }
  }

 private:
  const intptr_t cid_;
  intptr_t next_field_offset_;
  intptr_t instance_size_in_words_;
};


class LibraryPrefixSerializationCluster : public SerializationCluster {
 public:
  LibraryPrefixSerializationCluster() { }
  virtual ~LibraryPrefixSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawLibraryPrefix* prefix = LibraryPrefix::RawCast(object);
    objects_.Add(prefix);

    RawObject** from = prefix->from();
    RawObject** to = prefix->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kLibraryPrefixCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawLibraryPrefix* prefix = objects_[i];
      s->AssignRef(prefix);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawLibraryPrefix* prefix = objects_[i];
      RawObject** from = prefix->from();
      RawObject** to = prefix->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->Write<uint16_t>(prefix->ptr()->num_imports_);
      s->Write<bool>(prefix->ptr()->is_deferred_load_);
      s->Write<bool>(prefix->ptr()->is_loaded_);
    }
  }

 private:
  GrowableArray<RawLibraryPrefix*> objects_;
};


class LibraryPrefixDeserializationCluster : public DeserializationCluster {
 public:
  LibraryPrefixDeserializationCluster() { }
  virtual ~LibraryPrefixDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         LibraryPrefix::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawLibraryPrefix* prefix =
          reinterpret_cast<RawLibraryPrefix*>(d->Ref(id));
      Deserializer::InitializeHeader(prefix, kLibraryPrefixCid,
                                     LibraryPrefix::InstanceSize(),
                                     is_vm_object);
      RawObject** from = prefix->from();
      RawObject** to = prefix->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      prefix->ptr()->num_imports_ = d->Read<uint16_t>();
      prefix->ptr()->is_deferred_load_ = d->Read<bool>();
      prefix->ptr()->is_loaded_ = d->Read<bool>();
    }
  }
};


class TypeSerializationCluster : public SerializationCluster {
 public:
  TypeSerializationCluster() { }
  virtual ~TypeSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawType* type = Type::RawCast(object);
    if (type->IsCanonical()) {
      canonical_objects_.Add(type);
    } else {
      objects_.Add(type);
    }

    RawObject** from = type->from();
    RawObject** to = type->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }

    RawSmi* raw_type_class_id = Smi::RawCast(type->ptr()->type_class_id_);
    RawClass* type_class =
        s->isolate()->class_table()->At(Smi::Value(raw_type_class_id));
    s->Push(type_class);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kTypeCid);
    intptr_t count = canonical_objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawType* type = canonical_objects_[i];
      s->AssignRef(type);
    }
    count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawType* type = objects_[i];
      s->AssignRef(type);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = canonical_objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawType* type = canonical_objects_[i];
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->WriteTokenPosition(type->ptr()->token_pos_);
      s->Write<int8_t>(type->ptr()->type_state_);
    }
    count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawType* type = objects_[i];
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->WriteTokenPosition(type->ptr()->token_pos_);
      s->Write<int8_t>(type->ptr()->type_state_);
    }
  }

 private:
  GrowableArray<RawType*> canonical_objects_;
  GrowableArray<RawType*> objects_;
};


class TypeDeserializationCluster : public DeserializationCluster {
 public:
  TypeDeserializationCluster() { }
  virtual ~TypeDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    canonical_start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Type::InstanceSize()));
    }
    canonical_stop_index_ = d->next_index();

    start_index_ = d->next_index();
    count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Type::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = canonical_start_index_;
         id < canonical_stop_index_;
         id++) {
      RawType* type = reinterpret_cast<RawType*>(d->Ref(id));
      Deserializer::InitializeHeader(type, kTypeCid,
                                     Type::InstanceSize(), is_vm_object, true);
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      type->ptr()->token_pos_ = d->ReadTokenPosition();
      type->ptr()->type_state_ = d->Read<int8_t>();
    }

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawType* type = reinterpret_cast<RawType*>(d->Ref(id));
      Deserializer::InitializeHeader(type, kTypeCid,
                                     Type::InstanceSize(), is_vm_object);
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      type->ptr()->token_pos_ = d->ReadTokenPosition();
      type->ptr()->type_state_ = d->Read<int8_t>();
    }
  }

 private:
  intptr_t canonical_start_index_;
  intptr_t canonical_stop_index_;
};


class TypeRefSerializationCluster : public SerializationCluster {
 public:
  TypeRefSerializationCluster() { }
  virtual ~TypeRefSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawTypeRef* type = TypeRef::RawCast(object);
    objects_.Add(type);

    RawObject** from = type->from();
    RawObject** to = type->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kTypeRefCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawTypeRef* type = objects_[i];
      s->AssignRef(type);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawTypeRef* type = objects_[i];
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawTypeRef*> objects_;
};


class TypeRefDeserializationCluster : public DeserializationCluster {
 public:
  TypeRefDeserializationCluster() { }
  virtual ~TypeRefDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, TypeRef::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawTypeRef* type = reinterpret_cast<RawTypeRef*>(d->Ref(id));
      Deserializer::InitializeHeader(type, kTypeRefCid,
                                     TypeRef::InstanceSize(), is_vm_object);
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class TypeParameterSerializationCluster : public SerializationCluster {
 public:
  TypeParameterSerializationCluster() { }
  virtual ~TypeParameterSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawTypeParameter* type = TypeParameter::RawCast(object);
    objects_.Add(type);
    ASSERT(!type->IsCanonical());

    RawObject** from = type->from();
    RawObject** to = type->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kTypeParameterCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawTypeParameter* type = objects_[i];
      s->AssignRef(type);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawTypeParameter* type = objects_[i];
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
      s->Write<intptr_t>(type->ptr()->parameterized_class_id_);
      s->WriteTokenPosition(type->ptr()->token_pos_);
      s->Write<int16_t>(type->ptr()->index_);
      s->Write<int8_t>(type->ptr()->type_state_);
    }
  }

 private:
  GrowableArray<RawTypeParameter*> objects_;
};


class TypeParameterDeserializationCluster : public DeserializationCluster {
 public:
  TypeParameterDeserializationCluster() { }
  virtual ~TypeParameterDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         TypeParameter::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawTypeParameter* type = reinterpret_cast<RawTypeParameter*>(d->Ref(id));
      Deserializer::InitializeHeader(type, kTypeParameterCid,
                                     TypeParameter::InstanceSize(),
                                     is_vm_object);
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
      type->ptr()->parameterized_class_id_ = d->Read<intptr_t>();
      type->ptr()->token_pos_ = d->ReadTokenPosition();
      type->ptr()->index_ = d->Read<int16_t>();
      type->ptr()->type_state_ = d->Read<int8_t>();
    }
  }
};


class BoundedTypeSerializationCluster : public SerializationCluster {
 public:
  BoundedTypeSerializationCluster() { }
  virtual ~BoundedTypeSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawBoundedType* type = BoundedType::RawCast(object);
    objects_.Add(type);

    RawObject** from = type->from();
    RawObject** to = type->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kBoundedTypeCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawBoundedType* type = objects_[i];
      s->AssignRef(type);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawBoundedType* type = objects_[i];
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawBoundedType*> objects_;
};


class BoundedTypeDeserializationCluster : public DeserializationCluster {
 public:
  BoundedTypeDeserializationCluster() { }
  virtual ~BoundedTypeDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         BoundedType::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawBoundedType* type = reinterpret_cast<RawBoundedType*>(d->Ref(id));
      Deserializer::InitializeHeader(type, kBoundedTypeCid,
                                     BoundedType::InstanceSize(), is_vm_object);
      RawObject** from = type->from();
      RawObject** to = type->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class ClosureSerializationCluster : public SerializationCluster {
 public:
  ClosureSerializationCluster() { }
  virtual ~ClosureSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawClosure* closure = Closure::RawCast(object);
    objects_.Add(closure);

    RawObject** from = closure->from();
    RawObject** to = closure->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kClosureCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawClosure* closure = objects_[i];
      s->AssignRef(closure);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawClosure* closure = objects_[i];
      s->Write<bool>(closure->IsCanonical());
      RawObject** from = closure->from();
      RawObject** to = closure->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawClosure*> objects_;
};


class ClosureDeserializationCluster : public DeserializationCluster {
 public:
  ClosureDeserializationCluster() { }
  virtual ~ClosureDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Closure::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawClosure* closure = reinterpret_cast<RawClosure*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(closure, kClosureCid,
                                     Closure::InstanceSize(),
                                     is_vm_object, is_canonical);
      RawObject** from = closure->from();
      RawObject** to = closure->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class MintSerializationCluster : public SerializationCluster {
 public:
  MintSerializationCluster() { }
  virtual ~MintSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawMint* mint = Mint::RawCast(object);
    objects_.Add(mint);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kMintCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawMint* mint = objects_[i];
      s->AssignRef(mint);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawMint* mint = objects_[i];
      s->Write<bool>(mint->IsCanonical());
      s->Write<int64_t>(mint->ptr()->value_);
    }
  }

 private:
  GrowableArray<RawMint*> objects_;
};


class MintDeserializationCluster : public DeserializationCluster {
 public:
  MintDeserializationCluster() { }
  virtual ~MintDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Mint::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawMint* mint = reinterpret_cast<RawMint*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(mint, kMintCid,
                                     Mint::InstanceSize(),
                                     is_vm_object, is_canonical);
      mint->ptr()->value_ = d->Read<int64_t>();
    }
  }
};


class BigintSerializationCluster : public SerializationCluster {
 public:
  BigintSerializationCluster() { }
  virtual ~BigintSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawBigint* bigint = Bigint::RawCast(object);
    objects_.Add(bigint);

    RawObject** from = bigint->from();
    RawObject** to = bigint->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kBigintCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawBigint* bigint = objects_[i];
      s->AssignRef(bigint);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawBigint* bigint = objects_[i];
      s->Write<bool>(bigint->IsCanonical());
      RawObject** from = bigint->from();
      RawObject** to = bigint->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawBigint*> objects_;
};


class BigintDeserializationCluster : public DeserializationCluster {
 public:
  BigintDeserializationCluster() { }
  virtual ~BigintDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Bigint::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawBigint* bigint = reinterpret_cast<RawBigint*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(bigint, kBigintCid,
                                     Bigint::InstanceSize(),
                                     is_vm_object, is_canonical);
      RawObject** from = bigint->from();
      RawObject** to = bigint->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class DoubleSerializationCluster : public SerializationCluster {
 public:
  DoubleSerializationCluster() { }
  virtual ~DoubleSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawDouble* dbl = Double::RawCast(object);
    objects_.Add(dbl);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kDoubleCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawDouble* dbl = objects_[i];
      s->AssignRef(dbl);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawDouble* dbl = objects_[i];
      s->Write<bool>(dbl->IsCanonical());
      s->Write<double>(dbl->ptr()->value_);
    }
  }

 private:
  GrowableArray<RawDouble*> objects_;
};


class DoubleDeserializationCluster : public DeserializationCluster {
 public:
  DoubleDeserializationCluster() { }
  virtual ~DoubleDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space, Double::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawDouble* dbl = reinterpret_cast<RawDouble*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(dbl, kDoubleCid,
                                     Double::InstanceSize(),
                                     is_vm_object, is_canonical);
      dbl->ptr()->value_ = d->Read<double>();
    }
  }
};


class GrowableObjectArraySerializationCluster : public SerializationCluster {
 public:
  GrowableObjectArraySerializationCluster() { }
  virtual ~GrowableObjectArraySerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawGrowableObjectArray* array = GrowableObjectArray::RawCast(object);
    objects_.Add(array);

    RawObject** from = array->from();
    RawObject** to = array->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kGrowableObjectArrayCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawGrowableObjectArray* array = objects_[i];
      s->AssignRef(array);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawGrowableObjectArray* array = objects_[i];
      s->Write<bool>(array->IsCanonical());
      RawObject** from = array->from();
      RawObject** to = array->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawGrowableObjectArray*> objects_;
};


class GrowableObjectArrayDeserializationCluster
    : public DeserializationCluster {
 public:
  GrowableObjectArrayDeserializationCluster() { }
  virtual ~GrowableObjectArrayDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         GrowableObjectArray::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawGrowableObjectArray* list =
          reinterpret_cast<RawGrowableObjectArray*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(list, kGrowableObjectArrayCid,
                                     GrowableObjectArray::InstanceSize(),
                                     is_vm_object, is_canonical);
      RawObject** from = list->from();
      RawObject** to = list->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class TypedDataSerializationCluster : public SerializationCluster {
 public:
  explicit TypedDataSerializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~TypedDataSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawTypedData* data = TypedData::RawCast(object);
    objects_.Add(data);
  }

  void WriteAlloc(Serializer* s) {
    s->Write<intptr_t>(cid_);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawTypedData* data = objects_[i];
      intptr_t length = Smi::Value(data->ptr()->length_);
      s->Write<intptr_t>(length);
      s->AssignRef(data);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    intptr_t element_size = TypedData::ElementSizeInBytes(cid_);
    for (intptr_t i = 0; i < count; i++) {
      RawTypedData* data = objects_[i];
      intptr_t length = Smi::Value(data->ptr()->length_);
      s->Write<intptr_t>(length);
      s->Write<bool>(data->IsCanonical());
      uint8_t* cdata = reinterpret_cast<uint8_t*>(data->ptr()->data());
      s->WriteBytes(cdata, length * element_size);
    }
  }

 private:
  const intptr_t cid_;
  GrowableArray<RawTypedData*> objects_;
};


class TypedDataDeserializationCluster : public DeserializationCluster {
 public:
  explicit TypedDataDeserializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~TypedDataDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    intptr_t element_size = TypedData::ElementSizeInBytes(cid_);
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
          TypedData::InstanceSize(length * element_size)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();
    intptr_t element_size = TypedData::ElementSizeInBytes(cid_);

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawTypedData* data = reinterpret_cast<RawTypedData*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      bool is_canonical = d->Read<bool>();
      intptr_t length_in_bytes = length * element_size;
      Deserializer::InitializeHeader(data, cid_,
                                     TypedData::InstanceSize(length_in_bytes),
                                     is_vm_object, is_canonical);
      data->ptr()->length_ = Smi::New(length);
      uint8_t* cdata = reinterpret_cast<uint8_t*>(data->ptr()->data());
      d->ReadBytes(cdata, length_in_bytes);
    }
  }

 private:
  const intptr_t cid_;
};


class ExternalTypedDataSerializationCluster : public SerializationCluster {
 public:
  explicit ExternalTypedDataSerializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~ExternalTypedDataSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawExternalTypedData* data = ExternalTypedData::RawCast(object);
    objects_.Add(data);
    ASSERT(!data->IsCanonical());
  }

  void WriteAlloc(Serializer* s) {
    s->Write<intptr_t>(cid_);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawExternalTypedData* data = objects_[i];
      s->AssignRef(data);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    intptr_t element_size = ExternalTypedData::ElementSizeInBytes(cid_);
    for (intptr_t i = 0; i < count; i++) {
      RawExternalTypedData* data = objects_[i];
      intptr_t length = Smi::Value(data->ptr()->length_);
      s->Write<intptr_t>(length);
      uint8_t* cdata = reinterpret_cast<uint8_t*>(data->ptr()->data_);
      s->WriteBytes(cdata, length * element_size);
    }
  }

 private:
  const intptr_t cid_;
  GrowableArray<RawExternalTypedData*> objects_;
};


class ExternalTypedDataDeserializationCluster : public DeserializationCluster {
 public:
  explicit ExternalTypedDataDeserializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~ExternalTypedDataDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         ExternalTypedData::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();
    intptr_t element_size = ExternalTypedData::ElementSizeInBytes(cid_);

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawExternalTypedData* data =
          reinterpret_cast<RawExternalTypedData*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      Deserializer::InitializeHeader(data, cid_,
                                     ExternalTypedData::InstanceSize(),
                                     is_vm_object);
      data->ptr()->length_ = Smi::New(length);
      data->ptr()->data_ = const_cast<uint8_t*>(d->CurrentBufferAddress());
      d->Advance(length * element_size);
    }
  }

 private:
  const intptr_t cid_;
};


class StacktraceSerializationCluster : public SerializationCluster {
 public:
  StacktraceSerializationCluster() { }
  virtual ~StacktraceSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawStacktrace* trace = Stacktrace::RawCast(object);
    objects_.Add(trace);

    RawObject** from = trace->from();
    RawObject** to = trace->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kStacktraceCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawStacktrace* trace = objects_[i];
      s->AssignRef(trace);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawStacktrace* trace = objects_[i];
      RawObject** from = trace->from();
      RawObject** to = trace->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }
    }
  }

 private:
  GrowableArray<RawStacktrace*> objects_;
};


class StacktraceDeserializationCluster : public DeserializationCluster {
 public:
  StacktraceDeserializationCluster() { }
  virtual ~StacktraceDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         Stacktrace::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawStacktrace* trace = reinterpret_cast<RawStacktrace*>(d->Ref(id));
      Deserializer::InitializeHeader(trace, kStacktraceCid,
                                     Stacktrace::InstanceSize(), is_vm_object);
      RawObject** from = trace->from();
      RawObject** to = trace->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }
    }
  }
};


class RegExpSerializationCluster : public SerializationCluster {
 public:
  RegExpSerializationCluster() { }
  virtual ~RegExpSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawRegExp* regexp = RegExp::RawCast(object);
    objects_.Add(regexp);

    RawObject** from = regexp->from();
    RawObject** to = regexp->to();
    for (RawObject** p = from; p <= to; p++) {
      s->Push(*p);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kRegExpCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawRegExp* regexp = objects_[i];
      s->AssignRef(regexp);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawRegExp* regexp = objects_[i];
      RawObject** from = regexp->from();
      RawObject** to = regexp->to();
      for (RawObject** p = from; p <= to; p++) {
        s->WriteRef(*p);
      }

      s->Write<intptr_t>(regexp->ptr()->num_registers_);
      s->Write<int8_t>(regexp->ptr()->type_flags_);
    }
  }

 private:
  GrowableArray<RawRegExp*> objects_;
};


class RegExpDeserializationCluster : public DeserializationCluster {
 public:
  RegExpDeserializationCluster() { }
  virtual ~RegExpDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         RegExp::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawRegExp* regexp = reinterpret_cast<RawRegExp*>(d->Ref(id));
      Deserializer::InitializeHeader(regexp, kRegExpCid,
                                     RegExp::InstanceSize(), is_vm_object);
      RawObject** from = regexp->from();
      RawObject** to = regexp->to();
      for (RawObject** p = from; p <= to; p++) {
        *p = d->ReadRef();
      }

      regexp->ptr()->num_registers_ = d->Read<intptr_t>();
      regexp->ptr()->type_flags_ = d->Read<int8_t>();
    }
  }
};


class LinkedHashMapSerializationCluster : public SerializationCluster {
 public:
  LinkedHashMapSerializationCluster() { }
  virtual ~LinkedHashMapSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawLinkedHashMap* map = LinkedHashMap::RawCast(object);
    objects_.Add(map);

    s->Push(map->ptr()->type_arguments_);

    intptr_t used_data = Smi::Value(map->ptr()->used_data_);
    RawArray* data_array = map->ptr()->data_;
    RawObject** data_elements = data_array->ptr()->data();
    for (intptr_t i = 0; i < used_data; i += 2) {
      RawObject* key = data_elements[i];
      if (key != data_array) {
        RawObject* value = data_elements[i + 1];
        s->Push(key);
        s->Push(value);
      }
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kLinkedHashMapCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawLinkedHashMap* map = objects_[i];
      s->AssignRef(map);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawLinkedHashMap* map = objects_[i];
      s->Write<bool>(map->IsCanonical());

      s->WriteRef(map->ptr()->type_arguments_);

      const intptr_t used_data = Smi::Value(map->ptr()->used_data_);
      ASSERT((used_data & 1) == 0);  // Keys + values, so must be even.
      const intptr_t deleted_keys = Smi::Value(map->ptr()->deleted_keys_);

      // Write out the number of (not deleted) key/value pairs that will follow.
      s->Write<intptr_t>((used_data >> 1) - deleted_keys);

      RawArray* data_array = map->ptr()->data_;
      RawObject** data_elements = data_array->ptr()->data();
      for (intptr_t i = 0; i < used_data; i += 2) {
        RawObject* key = data_elements[i];
        if (key != data_array) {
          RawObject* value = data_elements[i + 1];
          s->WriteRef(key);
          s->WriteRef(value);
        }
      }
    }
  }

 private:
  GrowableArray<RawLinkedHashMap*> objects_;
};


class LinkedHashMapDeserializationCluster : public DeserializationCluster {
 public:
  LinkedHashMapDeserializationCluster() { }
  virtual ~LinkedHashMapDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      d->AssignRef(AllocateUninitialized(old_space,
                                         LinkedHashMap::InstanceSize()));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();
    PageSpace* old_space = d->heap()->old_space();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawLinkedHashMap* map = reinterpret_cast<RawLinkedHashMap*>(d->Ref(id));
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(map, kLinkedHashMapCid,
                                     LinkedHashMap::InstanceSize(),
                                     is_vm_object, is_canonical);

      map->ptr()->type_arguments_ =
          reinterpret_cast<RawTypeArguments*>(d->ReadRef());

      // TODO(rmacnak): Reserve ref ids and co-allocate in ReadAlloc.
      intptr_t pairs = d->Read<intptr_t>();
      intptr_t used_data = pairs << 1;
      intptr_t data_size = Utils::Maximum(
          Utils::RoundUpToPowerOfTwo(used_data),
          static_cast<uintptr_t>(LinkedHashMap::kInitialIndexSize));

      RawArray* data = reinterpret_cast<RawArray*>(
          AllocateUninitialized(old_space, Array::InstanceSize(data_size)));
      data->ptr()->type_arguments_ = TypeArguments::null();
      data->ptr()->length_ = Smi::New(data_size);
      intptr_t i;
      for (i = 0; i < used_data; i++) {
        data->ptr()->data()[i] = d->ReadRef();
      }
      for (; i < data_size; i++) {
        data->ptr()->data()[i] = Object::null();
      }

      map->ptr()->index_ = TypedData::null();
      map->ptr()->hash_mask_ = Smi::New(0);
      map->ptr()->data_ = data;
      map->ptr()->used_data_ = Smi::New(used_data);
      map->ptr()->deleted_keys_ = Smi::New(0);
    }
  }
};


class ArraySerializationCluster : public SerializationCluster {
 public:
  explicit ArraySerializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~ArraySerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawArray* array = Array::RawCast(object);
    objects_.Add(array);

    s->Push(array->ptr()->type_arguments_);
    intptr_t length = Smi::Value(array->ptr()->length_);
    for (intptr_t i = 0; i < length; i++) {
      s->Push(array->ptr()->data()[i]);
    }
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(cid_);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawArray* array = objects_[i];
      intptr_t length = Smi::Value(array->ptr()->length_);
      s->Write<intptr_t>(length);
      s->AssignRef(array);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawArray* array = objects_[i];
      intptr_t length = Smi::Value(array->ptr()->length_);
      s->Write<intptr_t>(length);
      s->Write<bool>(array->IsCanonical());
      s->WriteRef(array->ptr()->type_arguments_);
      for (intptr_t j = 0; j < length; j++) {
        s->WriteRef(array->ptr()->data()[j]);
      }
    }
  }

 private:
  intptr_t cid_;
  GrowableArray<RawArray*> objects_;
};


class ArrayDeserializationCluster : public DeserializationCluster {
 public:
  explicit ArrayDeserializationCluster(intptr_t cid) : cid_(cid) { }
  virtual ~ArrayDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         Array::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawArray* array = reinterpret_cast<RawArray*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(array, cid_,
                                     Array::InstanceSize(length),
                                     is_vm_object, is_canonical);
      array->ptr()->type_arguments_ =
          reinterpret_cast<RawTypeArguments*>(d->ReadRef());
      array->ptr()->length_ = Smi::New(length);
      for (intptr_t j = 0; j < length; j++) {
        array->ptr()->data()[j] = d->ReadRef();
      }
    }
  }

 private:
  const intptr_t cid_;
};


class OneByteStringSerializationCluster : public SerializationCluster {
 public:
  OneByteStringSerializationCluster() { }
  virtual ~OneByteStringSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawOneByteString* str = reinterpret_cast<RawOneByteString*>(object);
    objects_.Add(str);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kOneByteStringCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawOneByteString* str = objects_[i];
      intptr_t length = Smi::Value(str->ptr()->length_);
      s->Write<intptr_t>(length);
      s->AssignRef(str);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawOneByteString* str = objects_[i];
      intptr_t length = Smi::Value(str->ptr()->length_);
      s->Write<intptr_t>(length);
      s->Write<bool>(str->IsCanonical());
      intptr_t hash = Smi::Value(str->ptr()->hash_);
      s->Write<int32_t>(hash);
      s->WriteBytes(str->ptr()->data(), length);
    }
  }

 private:
  GrowableArray<RawOneByteString*> objects_;
};


class OneByteStringDeserializationCluster : public DeserializationCluster {
 public:
  OneByteStringDeserializationCluster() { }
  virtual ~OneByteStringDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         OneByteString::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawOneByteString* str = reinterpret_cast<RawOneByteString*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(str, kOneByteStringCid,
                                     OneByteString::InstanceSize(length),
                                     is_vm_object, is_canonical);
      str->ptr()->length_ = Smi::New(length);
      str->ptr()->hash_ = Smi::New(d->Read<intptr_t>());
      for (intptr_t j = 0; j < length; j++) {
        str->ptr()->data()[j] = d->Read<uint8_t>();
      }
    }
  }
};


class TwoByteStringSerializationCluster : public SerializationCluster {
 public:
  TwoByteStringSerializationCluster() { }
  virtual ~TwoByteStringSerializationCluster() { }

  void Trace(Serializer* s, RawObject* object) {
    RawTwoByteString* str = reinterpret_cast<RawTwoByteString*>(object);
    objects_.Add(str);
  }

  void WriteAlloc(Serializer* s) {
    s->WriteCid(kTwoByteStringCid);
    intptr_t count = objects_.length();
    s->Write<intptr_t>(count);
    for (intptr_t i = 0; i < count; i++) {
      RawTwoByteString* str = objects_[i];
      intptr_t length = Smi::Value(str->ptr()->length_);
      s->Write<intptr_t>(length);
      s->AssignRef(str);
    }
  }

  void WriteFill(Serializer* s) {
    intptr_t count = objects_.length();
    for (intptr_t i = 0; i < count; i++) {
      RawTwoByteString* str = objects_[i];
      intptr_t length = Smi::Value(str->ptr()->length_);
      s->Write<intptr_t>(length);
      s->Write<bool>(str->IsCanonical());
      intptr_t hash = Smi::Value(str->ptr()->hash_);
      s->Write<int32_t>(hash);
      s->WriteBytes(reinterpret_cast<uint8_t*>(str->ptr()->data()), length * 2);
    }
  }

 private:
  GrowableArray<RawTwoByteString*> objects_;
};


class TwoByteStringDeserializationCluster : public DeserializationCluster {
 public:
  TwoByteStringDeserializationCluster() { }
  virtual ~TwoByteStringDeserializationCluster() { }

  void ReadAlloc(Deserializer* d) {
    start_index_ = d->next_index();
    PageSpace* old_space = d->heap()->old_space();
    intptr_t count = d->Read<intptr_t>();
    for (intptr_t i = 0; i < count; i++) {
      intptr_t length = d->Read<intptr_t>();
      d->AssignRef(AllocateUninitialized(old_space,
                                         TwoByteString::InstanceSize(length)));
    }
    stop_index_ = d->next_index();
  }

  void ReadFill(Deserializer* d) {
    bool is_vm_object = d->isolate() == Dart::vm_isolate();

    for (intptr_t id = start_index_; id < stop_index_; id++) {
      RawTwoByteString* str =
          reinterpret_cast<RawTwoByteString*>(d->Ref(id));
      intptr_t length = d->Read<intptr_t>();
      bool is_canonical = d->Read<bool>();
      Deserializer::InitializeHeader(str, kTwoByteStringCid,
                                     TwoByteString::InstanceSize(length),
                                     is_vm_object, is_canonical);
      str->ptr()->length_ = Smi::New(length);
      str->ptr()->hash_ = Smi::New(d->Read<int32_t>());
      uint8_t* cdata = reinterpret_cast<uint8_t*>(str->ptr()->data());
      d->ReadBytes(cdata, length * 2);
    }
  }
};


Serializer::Serializer(Thread* thread,
                       Snapshot::Kind kind,
                       uint8_t** buffer,
                       ReAlloc alloc,
                       intptr_t initial_size,
                       InstructionsWriter* instructions_writer)
    : StackResource(thread),
      heap_(thread->isolate()->heap()),
      zone_(thread->zone()),
      kind_(kind),
      stream_(buffer, alloc, initial_size),
      instructions_writer_(instructions_writer),
      clusters_by_cid_(NULL),
      stack_(),
      num_cids_(0),
      num_base_objects_(0),
      num_written_objects_(0),
      next_ref_index_(1) {
  num_cids_ = thread->isolate()->class_table()->NumCids();
  clusters_by_cid_ = new SerializationCluster*[num_cids_];
  for (intptr_t i = 0; i < num_cids_; i++) {
    clusters_by_cid_[i] = NULL;
  }
}


Serializer::~Serializer() {
  delete[] clusters_by_cid_;
}


SerializationCluster* Serializer::NewClusterForClass(intptr_t cid) {
  Zone* Z = zone_;
  if ((cid > kNumPredefinedCids) ||
      (cid == kInstanceCid) ||
      RawObject::IsTypedDataViewClassId(cid)) {
    Push(isolate()->class_table()->At(cid));
    return new (Z) InstanceSerializationCluster(cid);
  }
  if (RawObject::IsExternalTypedDataClassId(cid)) {
    return new (Z) ExternalTypedDataSerializationCluster(cid);
  }
  if (RawObject::IsTypedDataClassId(cid)) {
    return new (Z) TypedDataSerializationCluster(cid);
  }

  switch (cid) {
    case kClassCid: return new (Z) ClassSerializationCluster(num_cids_);
    case kUnresolvedClassCid:
      return new (Z) UnresolvedClassSerializationCluster();
    case kTypeArgumentsCid: return new (Z) TypeArgumentsSerializationCluster();
    case kPatchClassCid: return new (Z) PatchClassSerializationCluster();
    case kFunctionCid: return new (Z) FunctionSerializationCluster();
    case kClosureDataCid: return new (Z) ClosureDataSerializationCluster();
    case kRedirectionDataCid:
      return new (Z) RedirectionDataSerializationCluster();
    case kFieldCid: return new (Z) FieldSerializationCluster();
    case kLiteralTokenCid: return new (Z) LiteralTokenSerializationCluster();
    case kTokenStreamCid: return new (Z) TokenStreamSerializationCluster();
    case kScriptCid: return new (Z) ScriptSerializationCluster();
    case kLibraryCid: return new (Z) LibrarySerializationCluster();
    case kNamespaceCid: return new (Z) NamespaceSerializationCluster();
    case kCodeCid: return new (Z) CodeSerializationCluster();
    case kObjectPoolCid: return new (Z) ObjectPoolSerializationCluster();
    case kPcDescriptorsCid:
      return new (Z) RODataSerializationCluster(kPcDescriptorsCid);
    case kStackmapCid:
      return new (Z) RODataSerializationCluster(kStackmapCid);
    case kExceptionHandlersCid:
      return new (Z) ExceptionHandlersSerializationCluster();
    case kContextCid: return new (Z) ContextSerializationCluster();
    case kContextScopeCid: return new (Z) ContextScopeSerializationCluster();
    case kICDataCid: return new (Z) ICDataSerializationCluster();
    case kMegamorphicCacheCid:
      return new (Z) MegamorphicCacheSerializationCluster();
    case kSubtypeTestCacheCid:
      return new (Z) SubtypeTestCacheSerializationCluster();
    case kLanguageErrorCid:
      return new (Z) LanguageErrorSerializationCluster();
    case kUnhandledExceptionCid:
      return new (Z) UnhandledExceptionSerializationCluster();
    case kLibraryPrefixCid: return new (Z) LibraryPrefixSerializationCluster();
    case kTypeCid: return new (Z) TypeSerializationCluster();
    case kTypeRefCid: return new (Z) TypeRefSerializationCluster();
    case kTypeParameterCid: return new (Z) TypeParameterSerializationCluster();
    case kBoundedTypeCid: return new (Z) BoundedTypeSerializationCluster();
    case kClosureCid: return new (Z) ClosureSerializationCluster();
    case kMintCid: return new (Z) MintSerializationCluster();
    case kBigintCid: return new (Z) BigintSerializationCluster();
    case kDoubleCid: return new (Z) DoubleSerializationCluster();
    case kGrowableObjectArrayCid:
      return new (Z) GrowableObjectArraySerializationCluster();
    case kStacktraceCid: return new (Z) StacktraceSerializationCluster();
    case kRegExpCid: return new (Z) RegExpSerializationCluster();
    case kLinkedHashMapCid: return new (Z) LinkedHashMapSerializationCluster();
    case kArrayCid:
      return new (Z) ArraySerializationCluster(kArrayCid);
    case kImmutableArrayCid:
      return new (Z) ArraySerializationCluster(kImmutableArrayCid);
    case kOneByteStringCid: {
      if (Snapshot::IncludesCode(kind_)) {
        return new (Z) RODataSerializationCluster(kOneByteStringCid);
      } else {
        return new (Z) OneByteStringSerializationCluster();
      }
    }
    case kTwoByteStringCid: {
      if (Snapshot::IncludesCode(kind_)) {
        return new (Z) RODataSerializationCluster(kTwoByteStringCid);
      } else {
        return new (Z) TwoByteStringSerializationCluster();
      }
    }
    default: break;
  }

  FATAL1("No cluster defined for cid %" Pd, cid);
  return NULL;
}


void Serializer::Trace(RawObject* object) {
  intptr_t cid;
  if (!object->IsHeapObject()) {
    cid = kSmiCid;
  } else {
    cid = object->GetClassId();
  }

  SerializationCluster* cluster = clusters_by_cid_[cid];
  if (cluster == NULL) {
    cluster = NewClusterForClass(cid);
    clusters_by_cid_[cid] = cluster;
  }
  ASSERT(cluster != NULL);
  cluster->Trace(this, object);
}


void Serializer::WriteVersionAndFeatures() {
  const char* expected_version = Version::SnapshotString();
  ASSERT(expected_version != NULL);
  const intptr_t version_len = strlen(expected_version);
  WriteBytes(reinterpret_cast<const uint8_t*>(expected_version), version_len);

  const char* expected_features = Dart::FeaturesString(kind_);
  ASSERT(expected_features != NULL);
  const intptr_t features_len = strlen(expected_features);
  WriteBytes(reinterpret_cast<const uint8_t*>(expected_features),
             features_len + 1);
  free(const_cast<char*>(expected_features));
}


#if defined(DEBUG)
static const intptr_t kSectionMarker = 0xABAB;
#endif

void Serializer::Serialize() {
  while (stack_.length() > 0) {
    Trace(stack_.RemoveLast());
  }

  intptr_t num_clusters = 0;
  for (intptr_t cid = 1; cid < num_cids_; cid++) {
    SerializationCluster* cluster = clusters_by_cid_[cid];
    if (cluster != NULL) {
      num_clusters++;
    }
  }

  intptr_t num_objects = num_base_objects_ + num_written_objects_;

  Write<int32_t>(num_objects);
  Write<int32_t>(num_clusters);

  for (intptr_t cid = 1; cid < num_cids_; cid++) {
    SerializationCluster* cluster = clusters_by_cid_[cid];
    if (cluster != NULL) {
      cluster->WriteAlloc(this);
#if defined(DEBUG)
      Write<intptr_t>(next_ref_index_);
#endif
    }
  }

  // We should have assigned a ref to every object we pushed.
  ASSERT((next_ref_index_ - 1) == num_objects);

  for (intptr_t cid = 1; cid < num_cids_; cid++) {
    SerializationCluster* cluster = clusters_by_cid_[cid];
    if (cluster != NULL) {
      cluster->WriteFill(this);
#if defined(DEBUG)
      Write<intptr_t>(kSectionMarker);
#endif
    }
  }
}


void Serializer::AddVMIsolateBaseObjects() {
  // These objects are always allocated by Object::InitOnce, so they are not
  // written into the snapshot.

  AddBaseObject(Object::null());
  AddBaseObject(Object::sentinel().raw());
  AddBaseObject(Object::transition_sentinel().raw());
  AddBaseObject(Object::empty_array().raw());
  AddBaseObject(Object::zero_array().raw());
  AddBaseObject(Object::dynamic_type().raw());
  AddBaseObject(Object::void_type().raw());
  AddBaseObject(Bool::True().raw());
  AddBaseObject(Bool::False().raw());
  AddBaseObject(Object::extractor_parameter_types().raw());
  AddBaseObject(Object::extractor_parameter_names().raw());
  AddBaseObject(Object::empty_context_scope().raw());
  AddBaseObject(Object::empty_descriptors().raw());
  AddBaseObject(Object::empty_var_descriptors().raw());
  AddBaseObject(Object::empty_exception_handlers().raw());

  for (intptr_t i = 0; i < ArgumentsDescriptor::kCachedDescriptorCount; i++) {
    AddBaseObject(ArgumentsDescriptor::cached_args_descriptors_[i]);
  }
  for (intptr_t i = 0; i < ICData::kCachedICDataArrayCount; i++) {
    AddBaseObject(ICData::cached_icdata_arrays_[i]);
  }

  ClassTable* table = isolate()->class_table();
  for (intptr_t cid = kClassCid; cid <= kUnwindErrorCid; cid++) {
    // Error has no class object.
    if (cid != kErrorCid) {
      ASSERT(table->HasValidClassAt(cid));
      AddBaseObject(table->At(cid));
    }
  }
  AddBaseObject(table->At(kDynamicCid));
  AddBaseObject(table->At(kVoidCid));
}


intptr_t Serializer::WriteVMSnapshot(const Array& symbols,
                                     const Array& scripts) {
  NoSafepointScope no_safepoint;

  AddVMIsolateBaseObjects();

  // Push roots.
  Push(symbols.raw());
  Push(scripts.raw());
  if (Snapshot::IncludesCode(kind_)) {
    StubCode::Push(this);
  }

  Serialize();

  // Write roots.
  WriteRef(symbols.raw());
  WriteRef(scripts.raw());
  if (Snapshot::IncludesCode(kind_)) {
    StubCode::WriteRef(this);
  }

#if defined(DEBUG)
  Write<intptr_t>(kSectionMarker);
#endif

  // Note we are not clearing the object id table. The full ref table
  // of the vm isolate snapshot serves as the base objects for the
  // regular isolate snapshot.

  // Return the number of objects, -1 accounts for unused ref 0.
  return next_ref_index_ - 1;
}


void Serializer::WriteFullSnapshot(intptr_t num_base_objects,
                                   ObjectStore* object_store) {
  NoSafepointScope no_safepoint;

  if (num_base_objects == 0) {
    // Units tests not writing a new vm isolate.
    const Array& base_objects = Object::vm_isolate_snapshot_object_table();
    for (intptr_t i = 1; i < base_objects.Length(); i++) {
      AddBaseObject(base_objects.At(i));
    }
  } else {
    // Base objects carried over from WriteVMIsolateSnapshot.
    num_base_objects_ += num_base_objects;
    next_ref_index_ += num_base_objects;
  }

  // Push roots.
  RawObject** from = object_store->from();
  RawObject** to = object_store->to_snapshot(kind_);
  for (RawObject** p = from; p <= to; p++) {
    Push(*p);
  }

  Serialize();

  // Write roots.
  for (RawObject** p = from; p <= to; p++) {
    WriteRef(*p);
  }

#if defined(DEBUG)
  Write<intptr_t>(kSectionMarker);
#endif

  heap_->ResetObjectIdTable();
}


Deserializer::Deserializer(Thread* thread,
                           Snapshot::Kind kind,
                           const uint8_t* buffer,
                           intptr_t size,
                           const uint8_t* instructions_buffer,
                           const uint8_t* data_buffer)
    : StackResource(thread),
      heap_(thread->isolate()->heap()),
      zone_(thread->zone()),
      kind_(kind),
      stream_(buffer, size),
      instructions_reader_(NULL),
      refs_(NULL),
      next_ref_index_(1),
      clusters_(NULL) {
  if (Snapshot::IncludesCode(kind)) {
    ASSERT(instructions_buffer != NULL);
  }
  if (instructions_buffer != NULL) {
    instructions_reader_ =
        new (zone_) InstructionsReader(instructions_buffer, data_buffer);
  }
}


Deserializer::~Deserializer() {
  delete[] clusters_;
}


DeserializationCluster* Deserializer::ReadCluster() {
  intptr_t cid = ReadCid();

  Zone* Z = zone_;
  if ((cid > kNumPredefinedCids) ||
      (cid == kInstanceCid) ||
      RawObject::IsTypedDataViewClassId(cid)) {
    return new (Z) InstanceDeserializationCluster(cid);
  }
  if (RawObject::IsExternalTypedDataClassId(cid)) {
    return new (Z) ExternalTypedDataDeserializationCluster(cid);
  }
  if (RawObject::IsTypedDataClassId(cid)) {
    return new (Z) TypedDataDeserializationCluster(cid);
  }

  switch (cid) {
    case kClassCid: return new (Z) ClassDeserializationCluster();
    case kUnresolvedClassCid:
      return new (Z) UnresolvedClassDeserializationCluster();
    case kTypeArgumentsCid:
      return new (Z) TypeArgumentsDeserializationCluster();
    case kPatchClassCid: return new (Z) PatchClassDeserializationCluster();
    case kFunctionCid: return new (Z) FunctionDeserializationCluster();
    case kClosureDataCid: return new (Z) ClosureDataDeserializationCluster();
    case kRedirectionDataCid:
      return new (Z) RedirectionDataDeserializationCluster();
    case kFieldCid: return new (Z) FieldDeserializationCluster();
    case kLiteralTokenCid: return new (Z) LiteralTokenDeserializationCluster();
    case kTokenStreamCid: return new (Z) TokenStreamDeserializationCluster();
    case kScriptCid: return new (Z) ScriptDeserializationCluster();
    case kLibraryCid: return new (Z) LibraryDeserializationCluster();
    case kNamespaceCid: return new (Z) NamespaceDeserializationCluster();
    case kCodeCid: return new (Z) CodeDeserializationCluster();
    case kObjectPoolCid: return new (Z) ObjectPoolDeserializationCluster();
    case kPcDescriptorsCid:
    case kStackmapCid:
      return new (Z) RODataDeserializationCluster();
    case kExceptionHandlersCid:
      return new (Z) ExceptionHandlersDeserializationCluster();
    case kContextCid: return new (Z) ContextDeserializationCluster();
    case kContextScopeCid: return new (Z) ContextScopeDeserializationCluster();
    case kICDataCid: return new (Z) ICDataDeserializationCluster();
    case kMegamorphicCacheCid:
      return new (Z) MegamorphicCacheDeserializationCluster();
    case kSubtypeTestCacheCid:
      return new (Z) SubtypeTestCacheDeserializationCluster();
    case kLanguageErrorCid:
      return new (Z) LanguageErrorDeserializationCluster();
    case kUnhandledExceptionCid:
      return new (Z) UnhandledExceptionDeserializationCluster();
    case kLibraryPrefixCid:
      return new (Z) LibraryPrefixDeserializationCluster();
    case kTypeCid: return new (Z) TypeDeserializationCluster();
    case kTypeRefCid: return new (Z) TypeRefDeserializationCluster();
    case kTypeParameterCid:
      return new (Z) TypeParameterDeserializationCluster();
    case kBoundedTypeCid: return new (Z) BoundedTypeDeserializationCluster();
    case kClosureCid: return new (Z) ClosureDeserializationCluster();
    case kMintCid: return new (Z) MintDeserializationCluster();
    case kBigintCid: return new (Z) BigintDeserializationCluster();
    case kDoubleCid: return new (Z) DoubleDeserializationCluster();
    case kGrowableObjectArrayCid:
      return new (Z) GrowableObjectArrayDeserializationCluster();
    case kStacktraceCid: return new (Z) StacktraceDeserializationCluster();
    case kRegExpCid: return new (Z) RegExpDeserializationCluster();
    case kLinkedHashMapCid:
      return new (Z) LinkedHashMapDeserializationCluster();
    case kArrayCid:
      return new (Z) ArrayDeserializationCluster(kArrayCid);
    case kImmutableArrayCid:
      return new (Z) ArrayDeserializationCluster(kImmutableArrayCid);
    case kOneByteStringCid: {
      if (Snapshot::IncludesCode(kind_)) {
        return new (Z) RODataDeserializationCluster();
      } else {
        return new (Z) OneByteStringDeserializationCluster();
      }
    }
    case kTwoByteStringCid: {
      if (Snapshot::IncludesCode(kind_)) {
        return new (Z) RODataDeserializationCluster();
      } else {
        return new (Z) TwoByteStringDeserializationCluster();
      }
    }
    default: break;
  }
  FATAL1("No cluster defined for cid %" Pd, cid);
  return NULL;
}


RawApiError* Deserializer::VerifyVersionAndFeatures() {
  // If the version string doesn't match, return an error.
  // Note: New things are allocated only if we're going to return an error.

  const char* expected_version = Version::SnapshotString();
  ASSERT(expected_version != NULL);
  const intptr_t version_len = strlen(expected_version);
  if (PendingBytes() < version_len) {
    const intptr_t kMessageBufferSize = 128;
    char message_buffer[kMessageBufferSize];
    OS::SNPrint(message_buffer,
                kMessageBufferSize,
                "No full snapshot version found, expected '%s'",
                expected_version);
    // This can also fail while bringing up the VM isolate, so make sure to
    // allocate the error message in old space.
    const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
    return ApiError::New(msg, Heap::kOld);
  }

  const char* version = reinterpret_cast<const char*>(CurrentBufferAddress());
  ASSERT(version != NULL);
  if (strncmp(version, expected_version, version_len)) {
    const intptr_t kMessageBufferSize = 256;
    char message_buffer[kMessageBufferSize];
    char* actual_version = OS::StrNDup(version, version_len);
    OS::SNPrint(message_buffer,
                kMessageBufferSize,
                "Wrong %s snapshot version, expected '%s' found '%s'",
                (Snapshot::IsFull(kind_)) ? "full" : "script",
                expected_version,
                actual_version);
    free(actual_version);
    // This can also fail while bringing up the VM isolate, so make sure to
    // allocate the error message in old space.
    const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
    return ApiError::New(msg, Heap::kOld);
  }
  Advance(version_len);

  const char* expected_features = Dart::FeaturesString(kind_);
  ASSERT(expected_features != NULL);
  const intptr_t expected_len = strlen(expected_features);

  const char* features = reinterpret_cast<const char*>(CurrentBufferAddress());
  ASSERT(features != NULL);
  intptr_t buffer_len = OS::StrNLen(features, PendingBytes());
  if ((buffer_len != expected_len) ||
      strncmp(features, expected_features, expected_len)) {
    const intptr_t kMessageBufferSize = 256;
    char message_buffer[kMessageBufferSize];
    char* actual_features = OS::StrNDup(features, buffer_len < 128 ? buffer_len
                                                                   : 128);
    OS::SNPrint(message_buffer,
                kMessageBufferSize,
                "Wrong features in snapshot, expected '%s' found '%s'",
                expected_features,
                actual_features);
    free(const_cast<char*>(expected_features));
    free(actual_features);
    // This can also fail while bringing up the VM isolate, so make sure to
    // allocate the error message in old space.
    const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
    return ApiError::New(msg, Heap::kOld);
  }
  free(const_cast<char*>(expected_features));
  Advance(expected_len + 1);
  return ApiError::null();
}


void Deserializer::Prepare() {
  num_objects_ = Read<int32_t>();
  num_clusters_ = Read<int32_t>();

  clusters_ = new DeserializationCluster*[num_clusters_];
  refs_ = Array::New(num_objects_ + 1, Heap::kOld);
}


void Deserializer::Deserialize() {
  // TODO(rmacnak): Verify num of base objects.

  {
    NOT_IN_PRODUCT(TimelineDurationScope tds(thread(),
        Timeline::GetIsolateStream(), "ReadAlloc"));
    for (intptr_t i = 0; i < num_clusters_; i++) {
      clusters_[i] = ReadCluster();
      clusters_[i]->ReadAlloc(this);
#if defined(DEBUG)
      intptr_t serializers_next_ref_index_ = Read<intptr_t>();
      ASSERT(serializers_next_ref_index_ == next_ref_index_);
#endif
    }
  }

  // We should have completely filled the ref array.
  ASSERT((next_ref_index_ - 1) == num_objects_);

  {
    NOT_IN_PRODUCT(TimelineDurationScope tds(thread(),
        Timeline::GetIsolateStream(), "ReadFill"));
    for (intptr_t i = 0; i < num_clusters_; i++) {
      clusters_[i]->ReadFill(this);
#if defined(DEBUG)
      intptr_t section_marker = Read<intptr_t>();
      ASSERT(section_marker == kSectionMarker);
#endif
    }
  }
}

class HeapLocker : public StackResource {
 public:
  HeapLocker(Thread* thread, PageSpace* page_space)
      : StackResource(thread), page_space_(page_space) {
        page_space_->AcquireDataLock();
  }
  ~HeapLocker() {
    page_space_->ReleaseDataLock();
  }

 private:
  PageSpace* page_space_;
};


void Deserializer::AddVMIsolateBaseObjects() {
  // These objects are always allocated by Object::InitOnce, so they are not
  // written into the snapshot.

  AddBaseObject(Object::null());
  AddBaseObject(Object::sentinel().raw());
  AddBaseObject(Object::transition_sentinel().raw());
  AddBaseObject(Object::empty_array().raw());
  AddBaseObject(Object::zero_array().raw());
  AddBaseObject(Object::dynamic_type().raw());
  AddBaseObject(Object::void_type().raw());
  AddBaseObject(Bool::True().raw());
  AddBaseObject(Bool::False().raw());
  AddBaseObject(Object::extractor_parameter_types().raw());
  AddBaseObject(Object::extractor_parameter_names().raw());
  AddBaseObject(Object::empty_context_scope().raw());
  AddBaseObject(Object::empty_descriptors().raw());
  AddBaseObject(Object::empty_var_descriptors().raw());
  AddBaseObject(Object::empty_exception_handlers().raw());

  for (intptr_t i = 0; i < ArgumentsDescriptor::kCachedDescriptorCount; i++) {
    AddBaseObject(ArgumentsDescriptor::cached_args_descriptors_[i]);
  }
  for (intptr_t i = 0; i < ICData::kCachedICDataArrayCount; i++) {
    AddBaseObject(ICData::cached_icdata_arrays_[i]);
  }

  ClassTable* table = isolate()->class_table();
  for (intptr_t cid = kClassCid; cid <= kUnwindErrorCid; cid++) {
    // Error has no class object.
    if (cid != kErrorCid) {
      ASSERT(table->HasValidClassAt(cid));
      AddBaseObject(table->At(cid));
    }
  }
  AddBaseObject(table->At(kDynamicCid));
  AddBaseObject(table->At(kVoidCid));
}


void Deserializer::ReadVMSnapshot() {
  Array& symbol_table = Array::Handle(zone_);
  Array& refs = Array::Handle(zone_);
  Prepare();

  {
    NoSafepointScope no_safepoint;
    HeapLocker hl(thread(), heap_->old_space());

    AddVMIsolateBaseObjects();

    Deserialize();

    // Read roots.
    symbol_table ^= ReadRef();
    isolate()->object_store()->set_symbol_table(symbol_table);
    ReadRef();  // Script list.
    if (Snapshot::IncludesCode(kind_)) {
      StubCode::ReadRef(this);
    }

#if defined(DEBUG)
    intptr_t section_marker = Read<intptr_t>();
    ASSERT(section_marker == kSectionMarker);
#endif

    refs = refs_;
    refs_ = NULL;
  }

  Symbols::InitOnceFromSnapshot(isolate());

  Object::set_vm_isolate_snapshot_object_table(refs);

#if defined(DEBUG)
  isolate()->ValidateClassTable();
#endif
}

void Deserializer::ReadFullSnapshot(ObjectStore* object_store) {
  Array& refs = Array::Handle();
  Prepare();

  {
    NoSafepointScope no_safepoint;
    HeapLocker hl(thread(), heap_->old_space());

    // N.B.: Skipping index 0 because ref 0 is illegal.
    const Array& base_objects = Object::vm_isolate_snapshot_object_table();
    for (intptr_t i = 1; i < base_objects.Length(); i++) {
      AddBaseObject(base_objects.At(i));
    }

    Deserialize();

    // Read roots.
    RawObject** from = object_store->from();
    RawObject** to = object_store->to_snapshot(kind_);
    for (RawObject** p = from; p <= to; p++) {
      *p = ReadRef();
    }

#if defined(DEBUG)
    intptr_t section_marker = Read<intptr_t>();
    ASSERT(section_marker == kSectionMarker);
#endif

    refs = refs_;
    refs_ = NULL;
  }

#if defined(DEBUG)
  Isolate* isolate = thread()->isolate();
  isolate->ValidateClassTable();
  isolate->heap()->Verify();
#endif

  {
    NOT_IN_PRODUCT(TimelineDurationScope tds(thread(),
        Timeline::GetIsolateStream(), "PostLoad"));
    for (intptr_t i = 0; i < num_clusters_; i++) {
      clusters_[i]->PostLoad(refs, kind_, zone_);
    }
  }

  // Setup native resolver for bootstrap impl.
  Bootstrap::SetupNativeResolver();
}


// An object visitor which will iterate over all the script objects in the heap
// and either count them or collect them into an array. This is used during
// full snapshot generation of the VM isolate to write out all script
// objects and their accompanying token streams.
class ScriptVisitor : public ObjectVisitor {
 public:
  explicit ScriptVisitor(Thread* thread) :
      objHandle_(Object::Handle(thread->zone())),
      count_(0),
      scripts_(NULL) {}

  ScriptVisitor(Thread* thread, const Array* scripts) :
      objHandle_(Object::Handle(thread->zone())),
      count_(0),
      scripts_(scripts) {}

  void VisitObject(RawObject* obj) {
    if (obj->IsScript()) {
      if (scripts_ != NULL) {
        objHandle_ = obj;
        scripts_->SetAt(count_, objHandle_);
      }
      count_ += 1;
    }
  }

  intptr_t count() const { return count_; }

 private:
  Object& objHandle_;
  intptr_t count_;
  const Array* scripts_;
};


FullSnapshotWriter::FullSnapshotWriter(Snapshot::Kind kind,
                                       uint8_t** vm_isolate_snapshot_buffer,
                                       uint8_t** isolate_snapshot_buffer,
                                       ReAlloc alloc,
                                       InstructionsWriter* instructions_writer)
    : thread_(Thread::Current()),
      kind_(kind),
      vm_isolate_snapshot_buffer_(vm_isolate_snapshot_buffer),
      isolate_snapshot_buffer_(isolate_snapshot_buffer),
      alloc_(alloc),
      vm_isolate_snapshot_size_(0),
      isolate_snapshot_size_(0),
      instructions_writer_(instructions_writer),
      scripts_(Array::Handle(zone())),
      saved_symbol_table_(Array::Handle(zone())),
      new_vm_symbol_table_(Array::Handle(zone())) {
  ASSERT(isolate_snapshot_buffer_ != NULL);
  ASSERT(alloc_ != NULL);
  ASSERT(isolate() != NULL);
  ASSERT(ClassFinalizer::AllClassesFinalized());
  ASSERT(isolate() != NULL);
  ASSERT(heap() != NULL);
  ObjectStore* object_store = isolate()->object_store();
  ASSERT(object_store != NULL);

#if defined(DEBUG)
  // Ensure the class table is valid.
  isolate()->ValidateClassTable();
#endif
  // Can't have any mutation happening while we're serializing.
  ASSERT(isolate()->background_compiler() == NULL);

  if (vm_isolate_snapshot_buffer != NULL) {
    NOT_IN_PRODUCT(TimelineDurationScope tds(thread(),
        Timeline::GetIsolateStream(), "PrepareNewVMIsolate"));

    // Collect all the script objects and their accompanying token stream
    // objects into an array so that we can write it out as part of the VM
    // isolate snapshot. We first count the number of script objects, allocate
    // an array and then fill it up with the script objects.
    ScriptVisitor scripts_counter(thread());
    heap()->IterateOldObjects(&scripts_counter);
    Dart::vm_isolate()->heap()->IterateOldObjects(&scripts_counter);
    intptr_t count = scripts_counter.count();
    scripts_ = Array::New(count, Heap::kOld);
    ScriptVisitor script_visitor(thread(), &scripts_);
    heap()->IterateOldObjects(&script_visitor);
    Dart::vm_isolate()->heap()->IterateOldObjects(&script_visitor);
    ASSERT(script_visitor.count() == count);

    // Tuck away the current symbol table.
    saved_symbol_table_ = object_store->symbol_table();

    // Create a unified symbol table that will be written as the vm isolate's
    // symbol table.
    new_vm_symbol_table_ = Symbols::UnifiedSymbolTable();

    // Create an empty symbol table that will be written as the isolate's symbol
    // table.
    Symbols::SetupSymbolTable(isolate());
  } else {
    // Reuse the current vm isolate.
  }
}

FullSnapshotWriter::~FullSnapshotWriter() {
  // We may run Dart code afterwards, restore the symbol table if needed.
  if (!saved_symbol_table_.IsNull()) {
    isolate()->object_store()->set_symbol_table(saved_symbol_table_);
    saved_symbol_table_ = Array::null();
  }
  new_vm_symbol_table_ = Array::null();
  scripts_ = Array::null();
}


intptr_t FullSnapshotWriter::WriteVmIsolateSnapshot() {
  NOT_IN_PRODUCT(TimelineDurationScope tds(thread(),
      Timeline::GetIsolateStream(), "WriteVmIsolateSnapshot"));

  ASSERT(vm_isolate_snapshot_buffer_ != NULL);
  Serializer serializer(thread(),
                        kind_,
                        vm_isolate_snapshot_buffer_,
                        alloc_,
                        kInitialSize,
                        instructions_writer_);

  serializer.ReserveHeader();
  serializer.WriteVersionAndFeatures();
  /*
   * Now Write out the following
   * - the symbol table
   * - all the scripts and token streams for these scripts
   * - the stub code (precompiled snapshots only)
   **/
  intptr_t num_objects = serializer.WriteVMSnapshot(new_vm_symbol_table_,
                                                    scripts_);
  serializer.FillHeader(serializer.kind());

  vm_isolate_snapshot_size_ = serializer.bytes_written();
  return num_objects;
}


void FullSnapshotWriter::WriteIsolateFullSnapshot(
    intptr_t num_base_objects) {
  NOT_IN_PRODUCT(TimelineDurationScope tds(thread(),
      Timeline::GetIsolateStream(), "WriteIsolateFullSnapshot"));

  Serializer serializer(thread(),
                        kind_,
                        isolate_snapshot_buffer_,
                        alloc_,
                        kInitialSize,
                        instructions_writer_);
  ObjectStore* object_store = isolate()->object_store();
  ASSERT(object_store != NULL);

  serializer.ReserveHeader();
  serializer.WriteVersionAndFeatures();
  serializer.WriteFullSnapshot(num_base_objects, object_store);
  serializer.FillHeader(serializer.kind());

  isolate_snapshot_size_ = serializer.bytes_written();
}


void FullSnapshotWriter::WriteFullSnapshot() {
  intptr_t num_base_objects;
  if (vm_isolate_snapshot_buffer() != NULL) {
    num_base_objects = WriteVmIsolateSnapshot();
    ASSERT(num_base_objects != 0);
  } else {
    num_base_objects = 0;
  }

  WriteIsolateFullSnapshot(num_base_objects);

  if (Snapshot::IncludesCode(kind_)) {
    instructions_writer_->Write();

    OS::Print("VMIsolate(CodeSize): %" Pd "\n", VmIsolateSnapshotSize());
    OS::Print("Isolate(CodeSize): %" Pd "\n", IsolateSnapshotSize());
    OS::Print("Instructions(CodeSize): %" Pd "\n",
              instructions_writer_->binary_size());
    intptr_t total = VmIsolateSnapshotSize() +
                     IsolateSnapshotSize() +
                     instructions_writer_->binary_size();
    OS::Print("Total(CodeSize): %" Pd "\n", total);
  }
}


RawApiError* IsolateSnapshotReader::ReadFullSnapshot() {
  Deserializer deserializer(thread_,
                            kind_,
                            buffer_,
                            size_,
                            instructions_buffer_,
                            data_buffer_);

  RawApiError* error = deserializer.VerifyVersionAndFeatures();
  if (error != ApiError::null()) {
    return error;
  }

  deserializer.ReadFullSnapshot(thread_->isolate()->object_store());

  return ApiError::null();
}


RawApiError* VmIsolateSnapshotReader::ReadVmIsolateSnapshot() {
  Deserializer deserializer(thread_,
                            kind_,
                            buffer_,
                            size_,
                            instructions_buffer_,
                            data_buffer_);

  RawApiError* error = deserializer.VerifyVersionAndFeatures();
  if (error != ApiError::null()) {
    return error;
  }

  deserializer.ReadVMSnapshot();

  Dart::set_instructions_snapshot_buffer(instructions_buffer_);
  Dart::set_data_snapshot_buffer(data_buffer_);

  return ApiError::null();
}

}  // namespace dart