blob: 170bc96e2759b519aaa9578a58da74d46adf5727 [file] [log] [blame]
// Copyright (c) 2011, 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/bootstrap_natives.h"
#include "include/dart_api.h"
#include "platform/unicode.h"
#include "vm/dart_api_impl.h"
#include "vm/exceptions.h"
#include "vm/isolate.h"
#include "vm/native_entry.h"
#include "vm/object.h"
#include "vm/object_store.h"
#include "vm/symbols.h"
namespace dart {
DEFINE_NATIVE_ENTRY(String_fromEnvironment, 0, 3) {
GET_NON_NULL_NATIVE_ARGUMENT(String, name, arguments->NativeArgAt(1));
GET_NATIVE_ARGUMENT(String, default_value, arguments->NativeArgAt(2));
// Call the embedder to supply us with the environment.
const String& env_value =
String::Handle(Api::GetEnvironmentValue(thread, name));
if (!env_value.IsNull()) {
return Symbols::New(thread, env_value);
}
return default_value.raw();
}
DEFINE_NATIVE_ENTRY(StringBase_createFromCodePoints, 0, 3) {
GET_NON_NULL_NATIVE_ARGUMENT(Instance, list, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
Array& a = Array::Handle();
intptr_t length;
if (list.IsGrowableObjectArray()) {
const GrowableObjectArray& growableArray = GrowableObjectArray::Cast(list);
a = growableArray.data();
length = growableArray.Length();
} else if (list.IsArray()) {
a = Array::Cast(list).raw();
length = a.Length();
} else {
Exceptions::ThrowArgumentError(list);
return NULL; // Unreachable.
}
intptr_t start = start_obj.Value();
if ((start < 0) || (start > length)) {
Exceptions::ThrowArgumentError(start_obj);
}
intptr_t end = end_obj.Value();
if ((end < start) || (end > length)) {
Exceptions::ThrowArgumentError(end_obj);
}
// Unbox the array and determine the maximum element width.
bool is_one_byte_string = true;
intptr_t array_len = end - start;
intptr_t utf16_len = array_len;
int32_t* utf32_array = zone->Alloc<int32_t>(array_len);
Instance& index_object = Instance::Handle(zone);
for (intptr_t i = 0; i < array_len; i++) {
index_object ^= a.At(start + i);
if (!index_object.IsSmi()) {
Exceptions::ThrowArgumentError(index_object);
}
intptr_t value = Smi::Cast(index_object).Value();
if (Utf::IsOutOfRange(value)) {
Exceptions::ThrowByType(Exceptions::kArgument, Object::empty_array());
UNREACHABLE();
}
// Now it is safe to cast the value.
int32_t value32 = static_cast<int32_t>(value);
if (!Utf::IsLatin1(value32)) {
is_one_byte_string = false;
if (Utf::IsSupplementary(value32)) {
utf16_len += 1;
}
}
utf32_array[i] = value32;
}
if (is_one_byte_string) {
return OneByteString::New(utf32_array, array_len, Heap::kNew);
}
return TwoByteString::New(utf16_len, utf32_array, array_len, Heap::kNew);
}
DEFINE_NATIVE_ENTRY(StringBase_substringUnchecked, 0, 3) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
intptr_t start = start_obj.Value();
intptr_t end = end_obj.Value();
return String::SubString(receiver, start, (end - start));
}
// Return the bitwise-or of all characters in the slice from start to end.
static uint16_t CharacterLimit(const String& string,
intptr_t start,
intptr_t end) {
ASSERT(string.IsTwoByteString() || string.IsExternalTwoByteString());
// Maybe do loop unrolling, and handle two uint16_t in a single uint32_t
// operation.
NoSafepointScope no_safepoint;
uint16_t result = 0;
if (string.IsTwoByteString()) {
for (intptr_t i = start; i < end; i++) {
result |= TwoByteString::CharAt(string, i);
}
} else {
for (intptr_t i = start; i < end; i++) {
result |= ExternalTwoByteString::CharAt(string, i);
}
}
return result;
}
static const intptr_t kLengthSize = 11;
static const intptr_t kLengthMask = (1 << kLengthSize) - 1;
static bool CheckSlicesOneByte(const String& base,
const Array& matches,
const int len) {
Instance& object = Instance::Handle();
// Check each slice for one-bytedness.
for (intptr_t i = 0; i < len; i++) {
object ^= matches.At(i);
if (object.IsSmi()) {
intptr_t slice_start = Smi::Cast(object).Value();
intptr_t slice_end;
if (slice_start < 0) {
intptr_t bits = -slice_start;
slice_start = bits >> kLengthSize;
slice_end = slice_start + (bits & kLengthMask);
} else {
i++;
if (i >= len) {
// Bad format, handled later.
return false;
}
object ^= matches.At(i);
if (!object.IsSmi()) {
// Bad format, handled later.
return false;
}
slice_end = Smi::Cast(object).Value();
}
uint16_t char_limit = CharacterLimit(base, slice_start, slice_end);
if (char_limit > 0xff) {
return false;
}
}
}
return true;
}
DEFINE_NATIVE_ENTRY(StringBase_joinReplaceAllResult, 0, 4) {
const String& base = String::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(GrowableObjectArray, matches_growable,
arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, length_obj, arguments->NativeArgAt(2));
GET_NON_NULL_NATIVE_ARGUMENT(Bool, is_onebyte_obj, arguments->NativeArgAt(3));
intptr_t len = matches_growable.Length();
const Array& matches = Array::Handle(zone, matches_growable.data());
const intptr_t length = length_obj.Value();
if (length < 0) {
Exceptions::ThrowArgumentError(length_obj);
}
// Start out assuming result is one-byte if replacements are.
bool is_onebyte = is_onebyte_obj.value();
if (is_onebyte) {
// If any of the base string slices are not one-byte, the result will be
// a two-byte string.
if (!base.IsOneByteString() && !base.IsExternalOneByteString()) {
is_onebyte = CheckSlicesOneByte(base, matches, len);
}
}
const intptr_t base_length = base.Length();
String& result = String::Handle(zone);
if (is_onebyte) {
result = OneByteString::New(length, Heap::kNew);
} else {
result = TwoByteString::New(length, Heap::kNew);
}
Instance& object = Instance::Handle(zone);
intptr_t write_index = 0;
for (intptr_t i = 0; i < len; i++) {
object ^= matches.At(i);
if (object.IsSmi()) {
intptr_t slice_start = Smi::Cast(object).Value();
intptr_t slice_length = -1;
// Slices with limited ranges are stored in a single negative Smi.
if (slice_start < 0) {
intptr_t bits = -slice_start;
slice_start = bits >> kLengthSize;
slice_length = bits & kLengthMask;
} else {
i++;
if (i < len) { // Otherwise slice_length stays at -1.
object ^= matches.At(i);
if (object.IsSmi()) {
intptr_t slice_end = Smi::Cast(object).Value();
slice_length = slice_end - slice_start;
}
}
}
if (slice_length > 0) {
if (0 <= slice_start && slice_start + slice_length <= base_length &&
write_index + slice_length <= length) {
String::Copy(result, write_index, base, slice_start, slice_length);
write_index += slice_length;
continue;
}
}
// Either the slice_length was zero,
// or the first smi was positive and not followed by another smi,
// or the smis were not a valid slice of the base string,
// or the slice was too large to fit in the result.
// Something is wrong with the matches array!
Exceptions::ThrowArgumentError(matches_growable);
} else if (object.IsString()) {
const String& replacement = String::Cast(object);
intptr_t replacement_length = replacement.Length();
if (write_index + replacement_length > length) {
// Invalid input data, either in matches list or the total length.
Exceptions::ThrowArgumentError(matches_growable);
}
String::Copy(result, write_index, replacement, 0, replacement_length);
write_index += replacement_length;
}
}
if (write_index < length) {
Exceptions::ThrowArgumentError(matches_growable);
}
return result.raw();
}
DEFINE_NATIVE_ENTRY(OneByteString_substringUnchecked, 0, 3) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
ASSERT(receiver.IsOneByteString());
GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
const intptr_t start = start_obj.Value();
const intptr_t end = end_obj.Value();
return OneByteString::New(receiver, start, end - start, Heap::kNew);
}
// This is high-performance code.
DEFINE_NATIVE_ENTRY(OneByteString_splitWithCharCode, 0, 2) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
ASSERT(receiver.IsOneByteString());
GET_NON_NULL_NATIVE_ARGUMENT(Smi, smi_split_code, arguments->NativeArgAt(1));
const intptr_t len = receiver.Length();
const intptr_t split_code = smi_split_code.Value();
const GrowableObjectArray& result = GrowableObjectArray::Handle(
zone, GrowableObjectArray::New(16, Heap::kNew));
String& str = String::Handle(zone);
intptr_t start = 0;
intptr_t i = 0;
for (; i < len; i++) {
if (split_code == OneByteString::CharAt(receiver, i)) {
str = OneByteString::SubStringUnchecked(receiver, start, (i - start),
Heap::kNew);
result.Add(str);
start = i + 1;
}
}
str = OneByteString::SubStringUnchecked(receiver, start, (i - start),
Heap::kNew);
result.Add(str);
result.SetTypeArguments(TypeArguments::Handle(
zone, isolate->object_store()->type_argument_string()));
return result.raw();
}
DEFINE_NATIVE_ENTRY(Internal_allocateOneByteString, 0, 1) {
GET_NON_NULL_NATIVE_ARGUMENT(Integer, length_obj, arguments->NativeArgAt(0));
const int64_t length = length_obj.AsInt64Value();
if ((length < 0) || (length > OneByteString::kMaxElements)) {
// Assume that negative lengths are the result of wrapping in code in
// string_patch.dart.
const Instance& exception =
Instance::Handle(thread->isolate()->object_store()->out_of_memory());
Exceptions::Throw(thread, exception);
UNREACHABLE();
}
return OneByteString::New(static_cast<intptr_t>(length), Heap::kNew);
}
DEFINE_NATIVE_ENTRY(Internal_allocateTwoByteString, 0, 1) {
GET_NON_NULL_NATIVE_ARGUMENT(Integer, length_obj, arguments->NativeArgAt(0));
const int64_t length = length_obj.AsInt64Value();
if ((length < 0) || (length > TwoByteString::kMaxElements)) {
// Assume that negative lengths are the result of wrapping in code in
// string_patch.dart.
const Instance& exception =
Instance::Handle(thread->isolate()->object_store()->out_of_memory());
Exceptions::Throw(thread, exception);
UNREACHABLE();
}
return TwoByteString::New(static_cast<intptr_t>(length), Heap::kNew);
}
DEFINE_NATIVE_ENTRY(OneByteString_allocateFromOneByteList, 0, 3) {
Instance& list = Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
intptr_t start = start_obj.Value();
intptr_t end = end_obj.Value();
if (start < 0) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, start_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
intptr_t length = end - start;
if (length < 0) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, end_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
ASSERT(length >= 0);
Heap::Space space = Heap::kNew;
if (list.IsTypedData()) {
const TypedData& array = TypedData::Cast(list);
if (end > array.LengthInBytes()) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, end_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
return OneByteString::New(array, start, length, space);
} else if (list.IsExternalTypedData()) {
const ExternalTypedData& array = ExternalTypedData::Cast(list);
if (end > array.LengthInBytes()) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, end_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
return OneByteString::New(array, start, length, space);
} else if (list.IsTypedDataView()) {
const auto& view = TypedDataView::Cast(list);
if (end > Smi::Value(view.length())) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, end_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
const Instance& data_obj = Instance::Handle(view.typed_data());
intptr_t data_offset = Smi::Value(view.offset_in_bytes());
if (data_obj.IsTypedData()) {
const TypedData& array = TypedData::Cast(data_obj);
return OneByteString::New(array, data_offset + start, length, space);
} else if (data_obj.IsExternalTypedData()) {
const ExternalTypedData& array = ExternalTypedData::Cast(data_obj);
return OneByteString::New(array, data_offset + start, length, space);
}
} else if (list.IsArray()) {
const Array& array = Array::Cast(list);
if (end > array.Length()) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, end_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
String& string = String::Handle(OneByteString::New(length, space));
for (int i = 0; i < length; i++) {
intptr_t value = Smi::Value(static_cast<SmiPtr>(array.At(start + i)));
OneByteString::SetCharAt(string, i, value);
}
return string.raw();
} else if (list.IsGrowableObjectArray()) {
const GrowableObjectArray& array = GrowableObjectArray::Cast(list);
if (end > array.Length()) {
const Array& args = Array::Handle(Array::New(1));
args.SetAt(0, end_obj);
Exceptions::ThrowByType(Exceptions::kArgument, args);
}
String& string = String::Handle(OneByteString::New(length, space));
for (int i = 0; i < length; i++) {
intptr_t value = Smi::Value(static_cast<SmiPtr>(array.At(start + i)));
OneByteString::SetCharAt(string, i, value);
}
return string.raw();
}
UNREACHABLE();
return Object::null();
}
DEFINE_NATIVE_ENTRY(Internal_writeIntoOneByteString, 0, 3) {
GET_NON_NULL_NATIVE_ARGUMENT(String, receiver, arguments->NativeArgAt(0));
ASSERT(receiver.IsOneByteString());
GET_NON_NULL_NATIVE_ARGUMENT(Smi, index_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, code_point_obj, arguments->NativeArgAt(2));
ASSERT((0 <= code_point_obj.Value()) && (code_point_obj.Value() <= 0xFF));
OneByteString::SetCharAt(receiver, index_obj.Value(), code_point_obj.Value());
return Object::null();
}
DEFINE_NATIVE_ENTRY(Internal_writeIntoTwoByteString, 0, 3) {
GET_NON_NULL_NATIVE_ARGUMENT(String, receiver, arguments->NativeArgAt(0));
ASSERT(receiver.IsTwoByteString());
GET_NON_NULL_NATIVE_ARGUMENT(Smi, index_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, code_point_obj, arguments->NativeArgAt(2));
ASSERT((0 <= code_point_obj.Value()) && (code_point_obj.Value() <= 0xFFFF));
TwoByteString::SetCharAt(receiver, index_obj.Value(), code_point_obj.Value());
return Object::null();
}
DEFINE_NATIVE_ENTRY(TwoByteString_allocateFromTwoByteList, 0, 3) {
Instance& list = Instance::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
intptr_t start = start_obj.Value();
intptr_t end = end_obj.Value();
if (start < 0) {
Exceptions::ThrowArgumentError(start_obj);
}
intptr_t length = end - start;
if (length < 0) {
Exceptions::ThrowArgumentError(end_obj);
}
Heap::Space space = Heap::kNew;
if (list.IsTypedData()) {
const TypedData& array = TypedData::Cast(list);
if (array.ElementType() != kUint16ArrayElement) {
Exceptions::ThrowArgumentError(list);
}
if (end > array.Length()) {
Exceptions::ThrowArgumentError(end_obj);
}
return TwoByteString::New(array, start * sizeof(uint16_t), length, space);
} else if (list.IsExternalTypedData()) {
const ExternalTypedData& array = ExternalTypedData::Cast(list);
if (array.ElementType() != kUint16ArrayElement) {
Exceptions::ThrowArgumentError(list);
}
if (end > array.Length()) {
Exceptions::ThrowArgumentError(end_obj);
}
return TwoByteString::New(array, start * sizeof(uint16_t), length, space);
} else if (IsTypedDataViewClassId(list.GetClassId())) {
const auto& view = TypedDataView::Cast(list);
const intptr_t cid = list.GetClassId();
if (cid != kTypedDataUint16ArrayViewCid) {
Exceptions::ThrowArgumentError(list);
}
if (end > Smi::Value(view.length())) {
Exceptions::ThrowArgumentError(end_obj);
}
const auto& data_obj = Instance::Handle(zone, view.typed_data());
const intptr_t data_offset = Smi::Value(view.offset_in_bytes());
if (data_obj.IsTypedData()) {
const TypedData& array = TypedData::Cast(data_obj);
return TwoByteString::New(array, data_offset + start * sizeof(uint16_t),
length, space);
} else if (data_obj.IsExternalTypedData()) {
const ExternalTypedData& array = ExternalTypedData::Cast(data_obj);
return TwoByteString::New(array, data_offset + start * sizeof(uint16_t),
length, space);
}
} else if (list.IsArray()) {
const Array& array = Array::Cast(list);
if (end > array.Length()) {
Exceptions::ThrowArgumentError(end_obj);
}
const String& string =
String::Handle(zone, TwoByteString::New(length, space));
for (int i = 0; i < length; i++) {
intptr_t value = Smi::Value(static_cast<SmiPtr>(array.At(start + i)));
TwoByteString::SetCharAt(string, i, value);
}
return string.raw();
} else if (list.IsGrowableObjectArray()) {
const GrowableObjectArray& array = GrowableObjectArray::Cast(list);
if (end > array.Length()) {
Exceptions::ThrowArgumentError(end_obj);
}
const String& string =
String::Handle(zone, TwoByteString::New(length, space));
for (int i = 0; i < length; i++) {
intptr_t value = Smi::Value(static_cast<SmiPtr>(array.At(start + i)));
TwoByteString::SetCharAt(string, i, value);
}
return string.raw();
}
UNREACHABLE();
return Object::null();
}
DEFINE_NATIVE_ENTRY(String_getHashCode, 0, 1) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
intptr_t hash_val = receiver.Hash();
ASSERT(hash_val > 0);
ASSERT(Smi::IsValid(hash_val));
return Smi::New(hash_val);
}
DEFINE_NATIVE_ENTRY(String_getLength, 0, 1) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
return Smi::New(receiver.Length());
}
static uint16_t StringValueAt(const String& str, const Integer& index) {
if (index.IsSmi()) {
const intptr_t index_value = Smi::Cast(index).Value();
if ((0 <= index_value) && (index_value < str.Length())) {
return str.CharAt(index_value);
}
}
// An index larger than Smi is always illegal.
Exceptions::ThrowRangeError("index", index, 0, str.Length() - 1);
return 0;
}
DEFINE_NATIVE_ENTRY(String_charAt, 0, 2) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Integer, index, arguments->NativeArgAt(1));
uint16_t value = StringValueAt(receiver, index);
return Symbols::FromCharCode(thread, static_cast<int32_t>(value));
}
// Returns the 16-bit UTF-16 code unit at the given index.
DEFINE_NATIVE_ENTRY(String_codeUnitAt, 0, 2) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Integer, index, arguments->NativeArgAt(1));
uint16_t value = StringValueAt(receiver, index);
return Smi::New(static_cast<intptr_t>(value));
}
DEFINE_NATIVE_ENTRY(String_concat, 0, 2) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(String, b, arguments->NativeArgAt(1));
return String::Concat(receiver, b);
}
DEFINE_NATIVE_ENTRY(String_toLowerCase, 0, 1) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
ASSERT(!receiver.IsNull());
return String::ToLowerCase(receiver);
}
DEFINE_NATIVE_ENTRY(String_toUpperCase, 0, 1) {
const String& receiver =
String::CheckedHandle(zone, arguments->NativeArgAt(0));
ASSERT(!receiver.IsNull());
return String::ToUpperCase(receiver);
}
DEFINE_NATIVE_ENTRY(String_concatRange, 0, 3) {
GET_NON_NULL_NATIVE_ARGUMENT(Instance, argument, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, start, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, end, arguments->NativeArgAt(2));
const intptr_t start_ix = start.Value();
const intptr_t end_ix = end.Value();
if (start_ix < 0) {
Exceptions::ThrowArgumentError(start);
}
Array& strings = Array::Handle();
intptr_t length = -1;
if (argument.IsArray()) {
strings ^= argument.raw();
length = strings.Length();
} else if (argument.IsGrowableObjectArray()) {
const GrowableObjectArray& g_array = GrowableObjectArray::Cast(argument);
strings = g_array.data();
length = g_array.Length();
} else {
Exceptions::ThrowArgumentError(argument);
}
if (end_ix > length) {
Exceptions::ThrowArgumentError(end);
}
#if defined(DEBUG)
// Check that the array contains strings.
Instance& elem = Instance::Handle();
for (intptr_t i = start_ix; i < end_ix; i++) {
elem ^= strings.At(i);
ASSERT(elem.IsString());
}
#endif
return String::ConcatAllRange(strings, start_ix, end_ix, Heap::kNew);
}
DEFINE_NATIVE_ENTRY(StringBuffer_createStringFromUint16Array, 0, 3) {
GET_NON_NULL_NATIVE_ARGUMENT(TypedData, codeUnits, arguments->NativeArgAt(0));
GET_NON_NULL_NATIVE_ARGUMENT(Smi, length, arguments->NativeArgAt(1));
GET_NON_NULL_NATIVE_ARGUMENT(Bool, isLatin1, arguments->NativeArgAt(2));
intptr_t array_length = codeUnits.Length();
intptr_t length_value = length.Value();
if (length_value < 0 || length_value > array_length) {
Exceptions::ThrowRangeError("length", length, 0, array_length);
}
const String& result =
isLatin1.value()
? String::Handle(OneByteString::New(length_value, Heap::kNew))
: String::Handle(TwoByteString::New(length_value, Heap::kNew));
NoSafepointScope no_safepoint;
uint16_t* data_position = reinterpret_cast<uint16_t*>(codeUnits.DataAddr(0));
String::Copy(result, 0, data_position, length_value);
return result.raw();
}
} // namespace dart