Samir Jindel
4d77c7b3a6
In conjunction with previous revisions, this improves several Flutter microbenchmarks by 2-4%. Change-Id: Ic864fd586dc57d87b80cebd6ceace0a8165fa82b Reviewed-on: https://dart-review.googlesource.com/c/88702 Commit-Queue: Samir Jindel <sjindel@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
78 lines
2.4 KiB
Dart
78 lines
2.4 KiB
Dart
// Copyright (c) 2012, 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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// part of "core_patch.dart";
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@patch
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class List<E> {
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@patch
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factory List([int length]) native "List_new";
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@patch
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factory List.filled(int length, E fill, {bool growable: false}) {
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// All error handling on the length parameter is done at the implementation
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// of new _List.
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var result = growable ? new _GrowableList<E>(length) : new _List<E>(length);
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if (fill != null) {
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for (int i = 0; i < length; i++) {
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result[i] = fill;
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}
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}
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return result;
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}
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@patch
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factory List.from(Iterable elements, {bool growable: true}) {
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if (elements is EfficientLengthIterable<E>) {
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int length = elements.length;
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var list = growable ? new _GrowableList<E>(length) : new _List<E>(length);
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if (length > 0) {
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// Avoid creating iterator unless necessary.
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int i = 0;
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for (var element in elements) {
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list[i++] = element;
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}
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}
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return list;
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}
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// If elements is an Iterable<E>, we won't need a type-test for each
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// element. In the "common case" that elements is an Iterable<E>, this
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// replaces a type-test on every element with a single type-test before
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// starting the loop.
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if (elements is Iterable<E>) {
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List<E> list = new _GrowableList<E>(0);
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for (E e in elements) {
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list.add(e);
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}
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if (growable) return list;
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return makeListFixedLength(list);
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} else {
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List<E> list = new _GrowableList<E>(0);
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for (E e in elements) {
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list.add(e);
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}
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if (growable) return list;
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return makeListFixedLength(list);
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}
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}
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@patch
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factory List.unmodifiable(Iterable elements) {
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final result = new List<E>.from(elements, growable: false);
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return makeFixedListUnmodifiable(result);
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}
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// Factory constructing a mutable List from a parser generated List literal.
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// [elements] contains elements that are already type checked.
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@pragma("vm:entry-point")
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factory List._fromLiteral(List elements) {
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if (elements.isEmpty) {
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return new _GrowableList<E>(0);
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}
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var result = new _GrowableList<E>.withData(elements);
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result._setLength(elements.length);
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return result;
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}
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}
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