dart::StringDeserializationCluster Class Reference

Inheritance diagram for dart::StringDeserializationCluster:

Public Member Functions
	StringDeserializationCluster (bool is_canonical, bool is_root_unit)
	~StringDeserializationCluster ()
void	ReadAlloc (Deserializer *d) override
void	ReadFill (Deserializer *d_) override
void	PostLoad (Deserializer *d, const Array &refs) override
Public Member Functions inherited from dart::CanonicalSetDeserializationCluster< CanonicalStringSet >
	CanonicalSetDeserializationCluster (bool is_canonical, bool is_root_unit, const char *name)
void	BuildCanonicalSetFromLayout (Deserializer *d)
Public Member Functions inherited from dart::DeserializationCluster
	DeserializationCluster (const char *name, bool is_canonical=false, bool is_immutable=false)
virtual	~DeserializationCluster ()
virtual void	ReadAlloc (Deserializer *deserializer)=0
virtual void	ReadFill (Deserializer *deserializer)=0
virtual void	PostLoad (Deserializer *deserializer, const Array &refs)
const char *	name () const
bool	is_canonical () const
Public Member Functions inherited from dart::ZoneAllocated
	ZoneAllocated ()
void *	operator new (size_t size)
void *	operator new (size_t size, Zone *zone)
void	operator delete (void *pointer)

Static Public Member Functions
static intptr_t	DecodeLengthAndCid (intptr_t encoded, intptr_t *out_cid)
static intptr_t	InstanceSize (intptr_t length, intptr_t cid)

Additional Inherited Members
Protected Member Functions inherited from dart::CanonicalSetDeserializationCluster< CanonicalStringSet >
void	VerifyCanonicalSet (Deserializer *d, const Array &refs, const typename SetType::ArrayHandle &current_table)
Protected Member Functions inherited from dart::DeserializationCluster
void	ReadAllocFixedSize (Deserializer *deserializer, intptr_t instance_size)
Protected Attributes inherited from dart::CanonicalSetDeserializationCluster< CanonicalStringSet >
const bool	is_root_unit_
intptr_t	first_element_
SetType::ArrayHandle &	table_
Protected Attributes inherited from dart::DeserializationCluster
const char *const	name_
const bool	is_canonical_
const bool	is_immutable_
intptr_t	start_index_
intptr_t	stop_index_

Detailed Description

Definition at line 6680 of file app_snapshot.cc.

Constructor & Destructor Documentation

StringDeserializationCluster()

dart::StringDeserializationCluster::StringDeserializationCluster ( bool  is_canonical, bool  is_root_unit  )

inlineexplicit

Definition at line 6693 of file app_snapshot.cc.

      : CanonicalSetDeserializationCluster(is_canonical,
                                           is_root_unit,
                                           "String") {}

~StringDeserializationCluster()

dart::StringDeserializationCluster::~StringDeserializationCluster ( )

inline

Definition at line 6697 of file app_snapshot.cc.

{}

Member Function Documentation

DecodeLengthAndCid()

static intptr_t dart::StringDeserializationCluster::DecodeLengthAndCid ( intptr_t  encoded, intptr_t *  out_cid  )

inlinestatic

Definition at line 6683 of file app_snapshot.cc.

                                                                          {
    *out_cid = (encoded & 0x1) != 0 ? kTwoByteStringCid : kOneByteStringCid;
    return encoded >> 1;
  }

InstanceSize()

static intptr_t dart::StringDeserializationCluster::InstanceSize ( intptr_t  length, intptr_t  cid  )

inlinestatic

Definition at line 6688 of file app_snapshot.cc.

                                                              {
    return cid == kOneByteStringCid ? OneByteString::InstanceSize(length)
                                    : TwoByteString::InstanceSize(length);
  }

PostLoad()

void dart::StringDeserializationCluster::PostLoad ( Deserializer *  d, const Array &  refs  )

inlineoverridevirtual

Reimplemented from dart::DeserializationCluster.

Definition at line 6766 of file app_snapshot.cc.

                                                             {
    if (!table_.IsNull()) {
      auto object_store = d->isolate_group()->object_store();
      VerifyCanonicalSet(d, refs,
                         WeakArray::Handle(object_store->symbol_table()));
      object_store->set_symbol_table(table_);
      if (d->isolate_group() == Dart::vm_isolate_group()) {
        Symbols::InitFromSnapshot(d->isolate_group());
      }
#if defined(DEBUG)
      Symbols::New(Thread::Current(), ":some:new:symbol:");
      ASSERT(object_store->symbol_table() == table_.ptr());  // Did not rehash.
#endif
    }
  }

ReadAlloc()

void dart::StringDeserializationCluster::ReadAlloc ( Deserializer *  d )

inlineoverridevirtual

Implements dart::DeserializationCluster.

Definition at line 6699 of file app_snapshot.cc.

                                           {
    start_index_ = d->next_index();
    const intptr_t count = d->ReadUnsigned();
    for (intptr_t i = 0; i < count; i++) {
      const intptr_t encoded = d->ReadUnsigned();
      intptr_t cid = 0;
      const intptr_t length = DecodeLengthAndCid(encoded, &cid);
      d->AssignRef(d->Allocate(InstanceSize(length, cid)));
    }
    stop_index_ = d->next_index();
    BuildCanonicalSetFromLayout(d);
  }

ReadFill()

void dart::StringDeserializationCluster::ReadFill ( Deserializer *  d_ )

inlineoverridevirtual

Implements dart::DeserializationCluster.

Definition at line 6712 of file app_snapshot.cc.

                                           {
    Deserializer::Local d(d_);
 
    for (intptr_t id = start_index_, n = stop_index_; id < n; id++) {
      StringPtr str = static_cast<StringPtr>(d.Ref(id));
      const intptr_t encoded = d.ReadUnsigned();
      intptr_t cid = 0;
      const intptr_t length = DecodeLengthAndCid(encoded, &cid);
      const intptr_t instance_size = InstanceSize(length, cid);
      // Clean up last two words of the string object to simplify future
      // string comparisons.
      // Objects are rounded up to two-word size boundary.
      *reinterpret_cast<word*>(reinterpret_cast<uint8_t*>(str->untag()) +
                               instance_size - 1 * kWordSize) = 0;
      *reinterpret_cast<word*>(reinterpret_cast<uint8_t*>(str->untag()) +
                               instance_size - 2 * kWordSize) = 0;
      Deserializer::InitializeHeader(str, cid, instance_size, is_canonical());
#if DART_COMPRESSED_POINTERS
      // Gap caused by less-than-a-word length_ smi sitting before data_.
      const intptr_t length_offset =
          reinterpret_cast<intptr_t>(&str->untag()->length_);
      const intptr_t data_offset =
          cid == kOneByteStringCid
              ? reinterpret_cast<intptr_t>(
                    static_cast<OneByteStringPtr>(str)->untag()->data())
              : reinterpret_cast<intptr_t>(
                    static_cast<TwoByteStringPtr>(str)->untag()->data());
      const intptr_t length_with_gap = data_offset - length_offset;
      ASSERT(length_with_gap > kCompressedWordSize);
      ASSERT(length_with_gap == kWordSize);
      memset(reinterpret_cast<void*>(length_offset), 0, length_with_gap);
#endif
      str->untag()->length_ = Smi::New(length);
 
      StringHasher hasher;
      if (cid == kOneByteStringCid) {
        for (intptr_t j = 0; j < length; j++) {
          uint8_t code_unit = d.Read<uint8_t>();
          static_cast<OneByteStringPtr>(str)->untag()->data()[j] = code_unit;
          hasher.Add(code_unit);
        }
 
      } else {
        for (intptr_t j = 0; j < length; j++) {
          uint16_t code_unit = d.Read<uint8_t>();
          code_unit = code_unit | (d.Read<uint8_t>() << 8);
          static_cast<TwoByteStringPtr>(str)->untag()->data()[j] = code_unit;
          hasher.Add(code_unit);
        }
      }
      String::SetCachedHash(str, hasher.Finalize());
    }
  }

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The documentation for this class was generated from the following file:

• third_party/dart-lang/sdk/runtime/vm/app_snapshot.cc