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[html] Better code for Element / _ChildrenElementList method
Two tricks let us compile this more efficiently: e.children.addAll(cs); Normally, get$children is inlined, returning a _ChildrenElementList wrapper, generating: new W._ChildrenElementList(e, e.children).addAll$1(0, cs); The two tricks: 1. Split _ChildElementList.addAll into an 'unwrap' that then calls the logic in '_addAll' 2. Add information about the properties of e.children that allow it to be removed. With these tricks, dart2js can optimize the code to this version that avoids allocating a wrapper or accessing the 'children' property: W._ChildrenElementList__addAll(e, cs); Change-Id: Ifdf533ac4f9790f09f87302e67304b5696097266 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/153904 Reviewed-by: Srujan Gaddam <srujzs@google.com> Commit-Queue: Stephen Adams <sra@google.com>
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@ -11722,6 +11722,10 @@ class _ChildrenElementList extends ListBase<Element>
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Iterator<Element> get iterator => toList().iterator;
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void addAll(Iterable<Element> iterable) {
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_addAll(_element, iterable);
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}
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static void _addAll(Element _element, Iterable<Element> iterable) {
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if (iterable is _ChildNodeListLazy) {
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iterable = new List.from(iterable);
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}
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@ -11775,6 +11779,10 @@ class _ChildrenElementList extends ListBase<Element>
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}
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bool remove(Object? object) {
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return _remove(_element, object);
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}
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static bool _remove(Element _element, Object? object) {
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if (object is Element) {
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Element element = object;
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if (identical(element.parentNode, _element)) {
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@ -11823,7 +11831,10 @@ class _ChildrenElementList extends ListBase<Element>
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return result;
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}
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Element get first {
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Element get first => _first(_element);
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@pragma('dart2js:noInline')
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static Element _first(Element _element) {
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Element? result = _element._firstElementChild;
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if (result == null) throw new StateError("No elements");
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return result;
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@ -12965,6 +12976,16 @@ class Element extends Node
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*/
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List<Element> get children => new _ChildrenElementList._wrap(this);
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List<Node> get _children =>
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// Element.children always returns the same list-like object which is a
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// live view on the underlying DOM tree. So we can GVN it and remove it if
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// unused.
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JS(
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'returns:HtmlCollection;creates:HtmlCollection;'
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'depends:none;effects:none;gvn:true',
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'#.children',
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this);
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set children(List<Element> value) {
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// Copy list first since we don't want liveness during iteration.
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var copy = value.toList();
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@ -14824,11 +14845,6 @@ class Element extends Node
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@JSName('childElementCount')
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int get _childElementCount native;
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@JSName('children')
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@Returns('HtmlCollection')
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@Creates('HtmlCollection')
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List<Node> get _children native;
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@JSName('firstElementChild')
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Element? get _firstElementChild native;
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@ -387,7 +387,6 @@ private_html_members = monitored.Set(
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# Not prefixed but requires custom implementation for cross-browser compatibility.
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'Document.visibilityState',
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'Element.animate',
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'Element.children',
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'Element.childElementCount',
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'Element.firstElementChild',
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'Element.getClientRects',
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@ -791,6 +790,7 @@ removed_html_members = monitored.Set(
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'DOMException.WRONG_DOCUMENT_ERR',
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'Element.accessKey',
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'Element.append',
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'Element.children',
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'Element.dataset',
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'Element.get:classList',
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'Element.getAttributeNode',
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@ -46,6 +46,10 @@ class _ChildrenElementList extends ListBase<Element>
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Iterator<Element> get iterator => toList().iterator;
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void addAll(Iterable<Element> iterable) {
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_addAll(_element, iterable);
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}
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static void _addAll(Element _element, Iterable<Element> iterable) {
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if (iterable is _ChildNodeListLazy) {
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iterable = new List.from(iterable);
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}
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@ -99,6 +103,10 @@ class _ChildrenElementList extends ListBase<Element>
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}
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bool remove(Object$NULLABLE object) {
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return _remove(_element, object);
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}
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static bool _remove(Element _element, Object$NULLABLE object) {
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if (object is Element) {
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Element element = object;
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if (identical(element.parentNode, _element)) {
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@ -149,7 +157,10 @@ class _ChildrenElementList extends ListBase<Element>
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return result;
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}
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Element get first {
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Element get first => _first(_element);
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@pragma('dart2js:noInline')
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static Element _first(Element _element) {
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Element$NULLABLE result = _element._firstElementChild;
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if (result == null) throw new StateError("No elements");
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return result;
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@ -667,6 +678,15 @@ $endif
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*/
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List<Element> get children => new _ChildrenElementList._wrap(this);
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List<Node> get _children =>
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// Element.children always returns the same list-like object which is a
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// live view on the underlying DOM tree. So we can GVN it and remove it if
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// unused.
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JS('returns:HtmlCollection;creates:HtmlCollection;'
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'depends:none;effects:none;gvn:true',
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'#.children',
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this);
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set children(List<Element> value) {
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// Copy list first since we don't want liveness during iteration.
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var copy = value.toList();
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