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>
Stephen Adams
f997d62a6d