#include <objects.h>

Inheritance diagram for v8::internal::SeqString:

Collaboration diagram for v8::internal::SeqString:

Static Public Member Functions
static MUST_USE_RESULT Handle< String >	Truncate (Handle< SeqString > string, int new_length)

Static Public Member Functions inherited from v8::internal::String
static Handle< String >	Flatten (Handle< String > string, PretenureFlag pretenure=NOT_TENURED)

static bool	Equals (Handle< String > one, Handle< String > two)

template<typename sinkchar >
static void	WriteToFlat (String source, sinkchar sink, int from, int to)

static int	NonAsciiStart (const char *chars, int length)

static bool	IsAscii (const char *chars, int length)

static bool	IsAscii (const uint8_t *chars, int length)

static int	NonOneByteStart (const uc16 *chars, int length)

static bool	IsOneByte (const uc16 *chars, int length)

template<class Visitor >
static ConsString *	VisitFlat (Visitor visitor, String string, int offset=0)

static Handle< FixedArray >	CalculateLineEnds (Handle< String > string, bool include_ending_line)

Static Public Member Functions inherited from v8::internal::Name
static bool	Equals (Handle< Name > one, Handle< Name > two)

Static Public Member Functions inherited from v8::internal::HeapObject
static HeapObject *	FromAddress (Address address)

static Object **	RawField (HeapObject *obj, int offset)

static void	UpdateMapCodeCache (Handle< HeapObject > object, Handle< Name > name, Handle< Code > code)

Static Public Member Functions inherited from v8::internal::Object
static Handle< Object >	NewStorageFor (Isolate *isolate, Handle< Object > object, Representation representation)

static Handle< Object >	WrapForRead (Isolate *isolate, Handle< Object > object, Representation representation)

static MaybeHandle< JSReceiver >	ToObject (Isolate *isolate, Handle< Object > object)

static MaybeHandle< JSReceiver >	ToObject (Isolate *isolate, Handle< Object > object, Handle< Context > context)

static MUST_USE_RESULT MaybeHandle< Smi >	ToSmi (Isolate *isolate, Handle< Object > object)

static MUST_USE_RESULT MaybeHandle< Object >	GetProperty (LookupIterator *it)

static MUST_USE_RESULT MaybeHandle< Object >	SetProperty (Handle< Object > object, Handle< Name > key, Handle< Object > value, StrictMode strict_mode, StoreFromKeyed store_mode=MAY_BE_STORE_FROM_KEYED)

static MUST_USE_RESULT MaybeHandle< Object >	SetProperty (LookupIterator *it, Handle< Object > value, StrictMode strict_mode, StoreFromKeyed store_mode, StorePropertyMode data_store_mode=NORMAL_PROPERTY)

static MUST_USE_RESULT MaybeHandle< Object >	WriteToReadOnlyProperty (LookupIterator *it, Handle< Object > value, StrictMode strict_mode)

static Handle< Object >	SetDataProperty (LookupIterator *it, Handle< Object > value)

static MUST_USE_RESULT MaybeHandle< Object >	AddDataProperty (LookupIterator *it, Handle< Object > value, PropertyAttributes attributes, StrictMode strict_mode, StoreFromKeyed store_mode)

static MUST_USE_RESULT MaybeHandle< Object >	GetPropertyOrElement (Handle< Object > object, Handle< Name > key)

static MUST_USE_RESULT MaybeHandle< Object >	GetProperty (Isolate isolate, Handle< Object > object, const char key)

static MUST_USE_RESULT MaybeHandle< Object >	GetProperty (Handle< Object > object, Handle< Name > key)

static MUST_USE_RESULT MaybeHandle< Object >	GetPropertyWithAccessor (Handle< Object > receiver, Handle< Name > name, Handle< JSObject > holder, Handle< Object > structure)

static MUST_USE_RESULT MaybeHandle< Object >	SetPropertyWithAccessor (Handle< Object > receiver, Handle< Name > name, Handle< Object > value, Handle< JSObject > holder, Handle< Object > structure, StrictMode strict_mode)

static MUST_USE_RESULT MaybeHandle< Object >	GetPropertyWithDefinedGetter (Handle< Object > receiver, Handle< JSReceiver > getter)

static MUST_USE_RESULT MaybeHandle< Object >	SetPropertyWithDefinedSetter (Handle< Object > receiver, Handle< JSReceiver > setter, Handle< Object > value)

static MUST_USE_RESULT MaybeHandle< Object >	GetElement (Isolate *isolate, Handle< Object > object, uint32_t index)

static MUST_USE_RESULT MaybeHandle< Object >	GetElementWithReceiver (Isolate *isolate, Handle< Object > object, Handle< Object > receiver, uint32_t index)

static Handle< Smi >	GetOrCreateHash (Isolate *isolate, Handle< Object > object)

Static Public Attributes
static const int	kHeaderSize = String::kSize

Static Public Attributes inherited from v8::internal::String
static const int	kMaxCachedArrayIndexLength = 7

static const int	kArrayIndexValueBits = 24

static const int	kArrayIndexLengthBits

static const unsigned int	kContainsCachedArrayIndexMask

static const int	kLengthOffset = Name::kSize

static const int	kSize = kLengthOffset + kPointerSize

static const int	kMaxArrayIndexSize = 10

static const int32_t	kMaxOneByteCharCode = unibrow::Latin1::kMaxChar

static const uint32_t	kMaxOneByteCharCodeU = unibrow::Latin1::kMaxChar

static const int	kMaxUtf16CodeUnit = 0xffff

static const uint32_t	kMaxUtf16CodeUnitU = kMaxUtf16CodeUnit

static const int	kEmptyStringHash = kIsNotArrayIndexMask

static const int	kMaxLength = (1 << 28) - 16

static const int	kMaxHashCalcLength = 16383

static const int	kMaxShortPrintLength = 1024

Static Public Attributes inherited from v8::internal::Name
static const int	kHashFieldOffset = HeapObject::kHeaderSize

static const int	kSize = kHashFieldOffset + kPointerSize

static const int	kHashNotComputedMask = 1

static const int	kIsNotArrayIndexMask = 1 << 1

static const int	kNofHashBitFields = 2

static const int	kHashShift = kNofHashBitFields

static const uint32_t	kHashBitMask = 0xffffffffu >> kHashShift

static const int	kMaxCachedArrayIndexLength = 7

static const int	kArrayIndexValueBits = 24

static const int	kArrayIndexLengthBits

static const unsigned int	kContainsCachedArrayIndexMask

static const int	kEmptyHashField

Static Public Attributes inherited from v8::internal::HeapObject
static const int	kMapOffset = Object::kHeaderSize

static const int	kHeaderSize = kMapOffset + kPointerSize

Static Public Attributes inherited from v8::internal::Object
static const int	kHeaderSize = 0

Private Member Functions
	DISALLOW_IMPLICIT_CONSTRUCTORS (SeqString)

Additional Inherited Members
Public Types inherited from v8::internal::String
enum	Encoding { ONE_BYTE_ENCODING , TWO_BYTE_ENCODING }

Public Types inherited from v8::internal::Object
enum	StoreFromKeyed { MAY_BE_STORE_FROM_KEYED , CERTAINLY_NOT_STORE_FROM_KEYED }

enum	StorePropertyMode { NORMAL_PROPERTY , SUPER_PROPERTY }

Public Member Functions inherited from v8::internal::String
	STATIC_ASSERT ((kArrayIndexLengthBits > 0))

	STATIC_ASSERT (IS_POWER_OF_TWO(kMaxCachedArrayIndexLength+1))

int	length () const

void	set_length (int value)

int	synchronized_length () const

void	synchronized_set_length (int value)

bool	IsOneByteRepresentation () const

bool	IsTwoByteRepresentation () const

bool	IsOneByteRepresentationUnderneath ()

bool	IsTwoByteRepresentationUnderneath ()

bool	HasOnlyOneByteChars ()

void	Set (int index, uint16_t value)

	INLINE (uint16_t Get(int index))

FlatContent	GetFlatContent ()

String *	GetUnderlying ()

bool	MarkAsUndetectable ()

bool	Equals (String *other)

bool	IsUtf8EqualTo (Vector< const char > str, bool allow_prefix_match=false)

bool	IsOneByteEqualTo (Vector< const uint8_t > str)

bool	IsTwoByteEqualTo (Vector< const uc16 > str)

SmartArrayPointer< char >	ToCString (AllowNullsFlag allow_nulls, RobustnessFlag robustness_flag, int offset, int length, int *length_output=0)

SmartArrayPointer< char >	ToCString (AllowNullsFlag allow_nulls=DISALLOW_NULLS, RobustnessFlag robustness_flag=FAST_STRING_TRAVERSAL, int *length_output=0)

SmartArrayPointer< uc16 >	ToWideCString (RobustnessFlag robustness_flag=FAST_STRING_TRAVERSAL)

bool	ComputeArrayIndex (uint32_t *index)

bool	MakeExternal (v8::String::ExternalStringResource *resource)

bool	MakeExternal (v8::String::ExternalOneByteStringResource *resource)

bool	AsArrayIndex (uint32_t *index)

void	PrintOn (FILE *out)

bool	LooksValid ()

void	StringShortPrint (StringStream *accumulator)

void	PrintUC16 (OStream &os, int start=0, int end=-1)

bool	IsFlat ()

	STATIC_ASSERT (kMaxArrayIndexSize<(1<< kArrayIndexLengthBits))

const uc16 *	GetTwoByteData (unsigned start)

void	SetForwardedInternalizedString (String *string)

String *	GetForwardedInternalizedString ()

Public Member Functions inherited from v8::internal::Name
uint32_t	hash_field ()

void	set_hash_field (uint32_t value)

bool	HasHashCode ()

uint32_t	Hash ()

bool	Equals (Name *other)

bool	AsArrayIndex (uint32_t *index)

bool	IsOwn ()

	STATIC_ASSERT ((kArrayIndexLengthBits > 0))

	STATIC_ASSERT (IS_POWER_OF_TWO(kMaxCachedArrayIndexLength+1))

Public Member Functions inherited from v8::internal::HeapObject
Map *	map () const

void	set_map (Map *value)

void	set_map_no_write_barrier (Map *value)

Map *	synchronized_map ()

MapWord	synchronized_map_word () const

void	synchronized_set_map (Map *value)

void	synchronized_set_map_no_write_barrier (Map *value)

void	synchronized_set_map_word (MapWord map_word)

MapWord	map_word () const

void	set_map_word (MapWord map_word)

Heap *	GetHeap () const

Isolate *	GetIsolate () const

Address	address ()

void	Iterate (ObjectVisitor *v)

void	IterateBody (InstanceType type, int object_size, ObjectVisitor *v)

int	Size ()

bool	MayContainRawValues ()

int	SizeFromMap (Map *map)

WriteBarrierMode	GetWriteBarrierMode (const DisallowHeapAllocation &promise)

void	HeapObjectShortPrint (OStream &os)

	STATIC_ASSERT (kMapOffset==Internals::kHeapObjectMapOffset)

Public Member Functions inherited from v8::internal::Object
bool	IsObject () const

	INLINE (bool IsFixedArrayBase() const)

	INLINE (bool IsExternal() const)

	INLINE (bool IsAccessorInfo() const)

	INLINE (bool IsStruct() const)

	INLINE (bool IsSpecObject()) const

	INLINE (bool IsSpecFunction()) const

	INLINE (bool IsTemplateInfo()) const

	INLINE (bool IsNameDictionary() const)

	INLINE (bool IsSeededNumberDictionary() const)

	INLINE (bool IsUnseededNumberDictionary() const)

	INLINE (bool IsOrderedHashSet() const)

	INLINE (bool IsOrderedHashMap() const)

bool	IsCallable () const

	INLINE (bool IsUndefined() const)

	INLINE (bool IsNull() const)

	INLINE (bool IsTheHole() const)

	INLINE (bool IsException() const)

	INLINE (bool IsUninitialized() const)

	INLINE (bool IsTrue() const)

	INLINE (bool IsFalse() const)

	INLINE (bool IsArgumentsMarker() const)

	INLINE (bool IsFiller() const)

double	Number ()

	INLINE (bool IsNaN() const)

	INLINE (bool IsMinusZero() const)

bool	ToInt32 (int32_t *value)

bool	ToUint32 (uint32_t *value)

Representation	OptimalRepresentation ()

bool	FitsRepresentation (Representation representation)

Handle< HeapType >	OptimalType (Isolate *isolate, Representation representation)

bool	HasValidElements ()

bool	HasSpecificClassOf (String *name)

bool	BooleanValue ()

Object *	GetHash ()

bool	SameValue (Object *other)

bool	SameValueZero (Object *other)

bool	ToArrayIndex (uint32_t *index)

bool	IsStringObjectWithCharacterAt (uint32_t index)

void	VerifyApiCallResultType ()

void	ShortPrint (FILE *out=stdout)

void	ShortPrint (StringStream *accumulator)

Protected Member Functions inherited from v8::internal::HeapObject
void	IteratePointers (ObjectVisitor *v, int start, int end)

void	IteratePointer (ObjectVisitor *v, int offset)

void	IterateNextCodeLink (ObjectVisitor *v, int offset)

Static Protected Member Functions inherited from v8::internal::Name
static bool	IsHashFieldComputed (uint32_t field)

Detailed Description

Definition at line 8936 of file objects.h.

Member Function Documentation

◆ DISALLOW_IMPLICIT_CONSTRUCTORS()

v8::internal::SeqString::DISALLOW_IMPLICIT_CONSTRUCTORS ( SeqString )

private

◆ Truncate()

Handle< String > v8::internal::SeqString::Truncate	(	Handle< SeqString >	string,
		int	new_length
	)

static

Definition at line 8883 of file objects.cc.

                                                                            {
   int new_size, old_size;
   int old_length = string->length();
   if (old_length <= new_length) return string;
  
   if (string->IsSeqOneByteString()) {
     old_size = SeqOneByteString::SizeFor(old_length);
     new_size = SeqOneByteString::SizeFor(new_length);
   } else {
     DCHECK(string->IsSeqTwoByteString());
     old_size = SeqTwoByteString::SizeFor(old_length);
     new_size = SeqTwoByteString::SizeFor(new_length);
   }
  
   int delta = old_size - new_size;
  
   Address start_of_string = string->address();
   DCHECK_OBJECT_ALIGNED(start_of_string);
   DCHECK_OBJECT_ALIGNED(start_of_string + new_size);
  
   Heap* heap = string->GetHeap();
   NewSpace* newspace = heap->new_space();
   if (newspace->Contains(start_of_string) &&
       newspace->top() == start_of_string + old_size) {
     // Last allocated object in new space.  Simply lower allocation top.
     newspace->set_top(start_of_string + new_size);
   } else {
     // Sizes are pointer size aligned, so that we can use filler objects
     // that are a multiple of pointer size.
     heap->CreateFillerObjectAt(start_of_string + new_size, delta);
   }
   heap->AdjustLiveBytes(start_of_string, -delta, Heap::FROM_MUTATOR);
  
   // We are storing the new length using release store after creating a filler
   // for the left-over space to avoid races with the sweeper thread.
   string->synchronized_set_length(new_length);
  
   if (new_length == 0) return heap->isolate()->factory()->empty_string();
   return string;
 }

References v8::internal::Heap::AdjustLiveBytes(), v8::internal::NewSpace::Contains(), v8::internal::Heap::CreateFillerObjectAt(), DCHECK, DCHECK_OBJECT_ALIGNED, v8::internal::Isolate::factory(), v8::internal::Heap::FROM_MUTATOR, v8::internal::Heap::isolate(), v8::internal::Heap::new_space(), v8::internal::NewSpace::set_top(), v8::internal::SeqOneByteString::SizeFor(), v8::internal::SeqTwoByteString::SizeFor(), and v8::internal::NewSpace::top().

Referenced by v8::internal::RUNTIME_FUNCTION().

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Member Data Documentation

◆ kHeaderSize

const int v8::internal::SeqString::kHeaderSize = String::kSize

static

Definition at line 8941 of file objects.h.

Referenced by v8::internal::Heap::AllocateOneByteInternalizedString(), v8::internal::Heap::AllocateTwoByteInternalizedString(), and v8::internal::LCodeGen::BuildSeqStringOperand().

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

/mnt/V8SourceCode/src/objects.h
/mnt/V8SourceCode/src/objects.cc

Static Public Member Functions

Static Public Attributes