Siva Annamalai
964a659470
- Use passed in 'zone' argument in the native string functions - Use passed in 'thread' argument in the library mirror creation functions R=rmacnak@google.com Review URL: https://codereview.chromium.org/1935703002 .
629 lines
22 KiB
C++
629 lines
22 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/bootstrap_natives.h"
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#include "include/dart_api.h"
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#include "vm/exceptions.h"
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#include "vm/dart_api_impl.h"
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#include "vm/isolate.h"
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#include "vm/native_entry.h"
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#include "vm/object.h"
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#include "vm/symbols.h"
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#include "vm/unicode.h"
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namespace dart {
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DEFINE_NATIVE_ENTRY(String_fromEnvironment, 3) {
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GET_NON_NULL_NATIVE_ARGUMENT(String, name, arguments->NativeArgAt(1));
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GET_NATIVE_ARGUMENT(String, default_value, arguments->NativeArgAt(2));
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// Call the embedder to supply us with the environment.
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const String& env_value =
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String::Handle(Api::GetEnvironmentValue(thread, name));
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if (!env_value.IsNull()) {
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return Symbols::New(thread, env_value);
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}
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return default_value.raw();
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}
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DEFINE_NATIVE_ENTRY(StringBase_createFromCodePoints, 3) {
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GET_NON_NULL_NATIVE_ARGUMENT(Instance, list, arguments->NativeArgAt(0));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
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Array& a = Array::Handle();
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intptr_t length;
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if (list.IsGrowableObjectArray()) {
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const GrowableObjectArray& growableArray = GrowableObjectArray::Cast(list);
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a ^= growableArray.data();
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length = growableArray.Length();
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} else if (list.IsArray()) {
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a ^= Array::Cast(list).raw();
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length = a.Length();
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} else {
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Exceptions::ThrowArgumentError(list);
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return NULL; // Unreachable.
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}
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intptr_t start = start_obj.Value();
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if ((start < 0) || (start > length)) {
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Exceptions::ThrowArgumentError(start_obj);
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}
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intptr_t end = end_obj.Value();
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if ((end < start) || (end > length)) {
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Exceptions::ThrowArgumentError(end_obj);
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}
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// Unbox the array and determine the maximum element width.
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bool is_one_byte_string = true;
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intptr_t array_len = end - start;
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intptr_t utf16_len = array_len;
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int32_t* utf32_array = zone->Alloc<int32_t>(array_len);
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Instance& index_object = Instance::Handle(zone);
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for (intptr_t i = 0; i < array_len; i++) {
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index_object ^= a.At(start + i);
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if (!index_object.IsSmi()) {
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Exceptions::ThrowArgumentError(index_object);
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}
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intptr_t value = Smi::Cast(index_object).Value();
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if (Utf::IsOutOfRange(value)) {
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Exceptions::ThrowByType(Exceptions::kArgument, Object::empty_array());
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UNREACHABLE();
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}
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// Now it is safe to cast the value.
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int32_t value32 = static_cast<int32_t>(value);
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if (!Utf::IsLatin1(value32)) {
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is_one_byte_string = false;
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if (Utf::IsSupplementary(value32)) {
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utf16_len += 1;
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}
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}
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utf32_array[i] = value32;
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}
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if (is_one_byte_string) {
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return OneByteString::New(utf32_array, array_len, Heap::kNew);
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}
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return TwoByteString::New(utf16_len, utf32_array, array_len, Heap::kNew);
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}
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DEFINE_NATIVE_ENTRY(StringBase_substringUnchecked, 3) {
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const String& receiver = String::CheckedHandle(zone,
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arguments->NativeArgAt(0));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
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intptr_t start = start_obj.Value();
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intptr_t end = end_obj.Value();
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return String::SubString(receiver, start, (end - start));
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}
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// Return the bitwise-or of all characters in the slice from start to end.
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static uint16_t CharacterLimit(const String& string,
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intptr_t start, intptr_t end) {
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ASSERT(string.IsTwoByteString() || string.IsExternalTwoByteString());
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// Maybe do loop unrolling, and handle two uint16_t in a single uint32_t
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// operation.
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NoSafepointScope no_safepoint;
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uint16_t result = 0;
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if (string.IsTwoByteString()) {
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for (intptr_t i = start; i < end; i++) {
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result |= TwoByteString::CharAt(string, i);
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}
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} else {
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for (intptr_t i = start; i < end; i++) {
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result |= ExternalTwoByteString::CharAt(string, i);
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}
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}
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return result;
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}
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static const intptr_t kLengthSize = 11;
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static const intptr_t kLengthMask = (1 << kLengthSize) - 1;
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static bool CheckSlicesOneByte(const String& base,
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const Array& matches,
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const int len) {
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Instance& object = Instance::Handle();
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// Check each slice for one-bytedness.
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for (intptr_t i = 0; i < len; i++) {
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object ^= matches.At(i);
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if (object.IsSmi()) {
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intptr_t slice_start = Smi::Cast(object).Value();
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intptr_t slice_end;
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if (slice_start < 0) {
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intptr_t bits = -slice_start;
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slice_start = bits >> kLengthSize;
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slice_end = slice_start + (bits & kLengthMask);
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} else {
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i++;
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if (i >= len) {
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// Bad format, handled later.
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return false;
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}
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object ^= matches.At(i);
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if (!object.IsSmi()) {
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// Bad format, handled later.
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return false;
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}
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slice_end = Smi::Cast(object).Value();
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}
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uint16_t char_limit = CharacterLimit(base, slice_start, slice_end);
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if (char_limit > 0xff) {
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return false;
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}
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}
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}
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return true;
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}
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DEFINE_NATIVE_ENTRY(StringBase_joinReplaceAllResult, 4) {
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const String& base = String::CheckedHandle(zone,
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arguments->NativeArgAt(0));
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GET_NON_NULL_NATIVE_ARGUMENT(GrowableObjectArray,
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matches_growable, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, length_obj, arguments->NativeArgAt(2));
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GET_NON_NULL_NATIVE_ARGUMENT(Bool, is_onebyte_obj, arguments->NativeArgAt(3));
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intptr_t len = matches_growable.Length();
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const Array& matches = Array::Handle(zone, matches_growable.data());
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const intptr_t length = length_obj.Value();
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if (length < 0) {
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Exceptions::ThrowArgumentError(length_obj);
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}
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// Start out assuming result is one-byte if replacements are.
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bool is_onebyte = is_onebyte_obj.value();
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if (is_onebyte) {
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// If any of the base string slices are not one-byte, the result will be
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// a two-byte string.
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if (!base.IsOneByteString() && !base.IsExternalOneByteString()) {
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is_onebyte = CheckSlicesOneByte(base, matches, len);
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}
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}
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const intptr_t base_length = base.Length();
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String& result = String::Handle(zone);
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if (is_onebyte) {
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result ^= OneByteString::New(length, Heap::kNew);
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} else {
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result ^= TwoByteString::New(length, Heap::kNew);
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}
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Instance& object = Instance::Handle(zone);
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intptr_t write_index = 0;
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for (intptr_t i = 0; i < len; i++) {
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object ^= matches.At(i);
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if (object.IsSmi()) {
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intptr_t slice_start = Smi::Cast(object).Value();
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intptr_t slice_length = -1;
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// Slices with limited ranges are stored in a single negative Smi.
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if (slice_start < 0) {
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intptr_t bits = -slice_start;
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slice_start = bits >> kLengthSize;
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slice_length = bits & kLengthMask;
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} else {
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i++;
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if (i < len) { // Otherwise slice_length stays at -1.
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object ^= matches.At(i);
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if (object.IsSmi()) {
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intptr_t slice_end = Smi::Cast(object).Value();
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slice_length = slice_end - slice_start;
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}
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}
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}
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if (slice_length > 0) {
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if (0 <= slice_start &&
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slice_start + slice_length <= base_length &&
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write_index + slice_length <= length) {
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String::Copy(result, write_index,
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base, slice_start,
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slice_length);
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write_index += slice_length;
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continue;
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}
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}
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// Either the slice_length was zero,
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// or the first smi was positive and not followed by another smi,
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// or the smis were not a valid slice of the base string,
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// or the slice was too large to fit in the result.
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// Something is wrong with the matches array!
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Exceptions::ThrowArgumentError(matches_growable);
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} else if (object.IsString()) {
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const String& replacement = String::Cast(object);
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intptr_t replacement_length = replacement.Length();
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if (write_index + replacement_length > length) {
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// Invalid input data, either in matches list or the total length.
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Exceptions::ThrowArgumentError(matches_growable);
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}
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String::Copy(result, write_index, replacement, 0, replacement_length);
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write_index += replacement_length;
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}
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}
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if (write_index < length) {
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Exceptions::ThrowArgumentError(matches_growable);
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}
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return result.raw();
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}
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DEFINE_NATIVE_ENTRY(OneByteString_substringUnchecked, 3) {
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const String& receiver = String::CheckedHandle(zone,
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arguments->NativeArgAt(0));
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ASSERT(receiver.IsOneByteString());
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
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const intptr_t start = start_obj.Value();
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const intptr_t end = end_obj.Value();
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return OneByteString::New(receiver, start, end - start, Heap::kNew);
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}
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// This is high-performance code.
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DEFINE_NATIVE_ENTRY(OneByteString_splitWithCharCode, 2) {
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const String& receiver = String::CheckedHandle(zone,
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arguments->NativeArgAt(0));
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ASSERT(receiver.IsOneByteString());
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, smi_split_code, arguments->NativeArgAt(1));
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const intptr_t len = receiver.Length();
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const intptr_t split_code = smi_split_code.Value();
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const GrowableObjectArray& result = GrowableObjectArray::Handle(
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zone,
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GrowableObjectArray::New(16, Heap::kNew));
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String& str = String::Handle(zone);
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intptr_t start = 0;
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intptr_t i = 0;
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for (; i < len; i++) {
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if (split_code == OneByteString::CharAt(receiver, i)) {
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str = OneByteString::SubStringUnchecked(receiver,
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start,
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(i - start),
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Heap::kNew);
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result.Add(str);
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start = i + 1;
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}
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}
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str = OneByteString::SubStringUnchecked(receiver,
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start,
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(i - start),
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Heap::kNew);
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result.Add(str);
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return result.raw();
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}
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DEFINE_NATIVE_ENTRY(OneByteString_allocate, 1) {
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, length_obj, arguments->NativeArgAt(0));
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Heap::Space space = isolate->heap()->SpaceForAllocation(kOneByteStringCid);
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return OneByteString::New(length_obj.Value(), space);
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}
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DEFINE_NATIVE_ENTRY(OneByteString_allocateFromOneByteList, 3) {
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Instance& list = Instance::CheckedHandle(zone,
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arguments->NativeArgAt(0));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
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intptr_t start = start_obj.Value();
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intptr_t end = end_obj.Value();
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if (start < 0) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, start_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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intptr_t length = end - start;
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if (length < 0) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, end_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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ASSERT(length >= 0);
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Heap::Space space = isolate->heap()->SpaceForAllocation(kOneByteStringCid);
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if (list.IsTypedData()) {
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const TypedData& array = TypedData::Cast(list);
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if (end > array.LengthInBytes()) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, end_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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return OneByteString::New(array, start, length, space);
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} else if (list.IsExternalTypedData()) {
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const ExternalTypedData& array = ExternalTypedData::Cast(list);
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if (end > array.LengthInBytes()) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, end_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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return OneByteString::New(array, start, length, space);
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} else if (RawObject::IsTypedDataViewClassId(list.GetClassId())) {
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const Instance& view = Instance::Cast(list);
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if (end > Smi::Value(TypedDataView::Length(view))) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, end_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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const Instance& data_obj = Instance::Handle(TypedDataView::Data(view));
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intptr_t data_offset = Smi::Value(TypedDataView::OffsetInBytes(view));
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if (data_obj.IsTypedData()) {
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const TypedData& array = TypedData::Cast(data_obj);
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return OneByteString::New(array, data_offset + start, length, space);
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} else if (data_obj.IsExternalTypedData()) {
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const ExternalTypedData& array = ExternalTypedData::Cast(data_obj);
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return OneByteString::New(array, data_offset + start, length, space);
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}
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} else if (list.IsArray()) {
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const Array& array = Array::Cast(list);
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if (end > array.Length()) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, end_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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String& string = String::Handle(OneByteString::New(length, space));
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for (int i = 0; i < length; i++) {
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intptr_t value =
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Smi::Value(reinterpret_cast<RawSmi*>(array.At(start + i)));
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OneByteString::SetCharAt(string, i, value);
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}
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return string.raw();
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} else if (list.IsGrowableObjectArray()) {
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const GrowableObjectArray& array = GrowableObjectArray::Cast(list);
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if (end > array.Length()) {
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const Array& args = Array::Handle(Array::New(1));
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args.SetAt(0, end_obj);
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Exceptions::ThrowByType(Exceptions::kArgument, args);
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}
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String& string = String::Handle(OneByteString::New(length, space));
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for (int i = 0; i < length; i++) {
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intptr_t value =
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Smi::Value(reinterpret_cast<RawSmi*>(array.At(start + i)));
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OneByteString::SetCharAt(string, i, value);
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}
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return string.raw();
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}
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UNREACHABLE();
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return Object::null();
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}
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DEFINE_NATIVE_ENTRY(OneByteString_setAt, 3) {
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GET_NON_NULL_NATIVE_ARGUMENT(String, receiver, arguments->NativeArgAt(0));
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ASSERT(receiver.IsOneByteString());
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, index_obj, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, code_point_obj, arguments->NativeArgAt(2));
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ASSERT((0 <= code_point_obj.Value()) && (code_point_obj.Value() <= 0xFF));
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OneByteString::SetCharAt(receiver, index_obj.Value(), code_point_obj.Value());
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return Object::null();
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}
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DEFINE_NATIVE_ENTRY(ExternalOneByteString_getCid, 0) {
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return Smi::New(kExternalOneByteStringCid);
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}
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DEFINE_NATIVE_ENTRY(TwoByteString_allocateFromTwoByteList, 3) {
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Instance& list = Instance::CheckedHandle(zone,
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arguments->NativeArgAt(0));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, start_obj, arguments->NativeArgAt(1));
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GET_NON_NULL_NATIVE_ARGUMENT(Smi, end_obj, arguments->NativeArgAt(2));
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intptr_t start = start_obj.Value();
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intptr_t end = end_obj.Value();
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if (start < 0) {
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Exceptions::ThrowArgumentError(start_obj);
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}
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intptr_t length = end - start;
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if (length < 0) {
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Exceptions::ThrowArgumentError(end_obj);
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}
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Heap::Space space = isolate->heap()->SpaceForAllocation(kTwoByteStringCid);
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if (list.IsTypedData()) {
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const TypedData& array = TypedData::Cast(list);
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if (array.ElementType() != kUint16ArrayElement) {
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Exceptions::ThrowArgumentError(list);
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}
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if (end > array.Length()) {
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Exceptions::ThrowArgumentError(end_obj);
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}
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return TwoByteString::New(array, start * sizeof(uint16_t), length, space);
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} else if (list.IsExternalTypedData()) {
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const ExternalTypedData& array = ExternalTypedData::Cast(list);
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if (array.ElementType() != kUint16ArrayElement) {
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Exceptions::ThrowArgumentError(list);
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}
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if (end > array.Length()) {
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Exceptions::ThrowArgumentError(end_obj);
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}
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return TwoByteString::New(array, start * sizeof(uint16_t), length, space);
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} else if (RawObject::IsTypedDataViewClassId(list.GetClassId())) {
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const intptr_t cid = list.GetClassId();
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if (cid != kTypedDataUint16ArrayViewCid) {
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Exceptions::ThrowArgumentError(list);
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}
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if (end > Smi::Value(TypedDataView::Length(list))) {
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Exceptions::ThrowArgumentError(end_obj);
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}
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|
const Instance& data_obj = Instance::Handle(zone,
|
|
TypedDataView::Data(list));
|
|
intptr_t data_offset = Smi::Value(TypedDataView::OffsetInBytes(list));
|
|
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(reinterpret_cast<RawSmi*>(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(reinterpret_cast<RawSmi*>(array.At(start + i)));
|
|
TwoByteString::SetCharAt(string, i, value);
|
|
}
|
|
return string.raw();
|
|
}
|
|
UNREACHABLE();
|
|
return Object::null();
|
|
}
|
|
|
|
|
|
DEFINE_NATIVE_ENTRY(String_getHashCode, 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, 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, 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, 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, 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, 1) {
|
|
const String& receiver = String::CheckedHandle(zone,
|
|
arguments->NativeArgAt(0));
|
|
ASSERT(!receiver.IsNull());
|
|
return String::ToLowerCase(receiver);
|
|
}
|
|
|
|
|
|
DEFINE_NATIVE_ENTRY(String_toUpperCase, 1) {
|
|
const String& receiver = String::CheckedHandle(zone,
|
|
arguments->NativeArgAt(0));
|
|
ASSERT(!receiver.IsNull());
|
|
return String::ToUpperCase(receiver);
|
|
}
|
|
|
|
|
|
DEFINE_NATIVE_ENTRY(String_concatRange, 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, 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
|