commit | 8fdd773096341805ca0311241aa88ef66f3e92c3 | [log] [tgz] |
---|---|---|
author | Nate Biggs <natebiggs@google.com> | Mon Apr 04 23:58:02 2022 +0000 |
committer | Commit Bot <commit-bot@chromium.org> | Mon Apr 04 23:58:02 2022 +0000 |
tree | 234e3ea818eac93f4d9187cfb76e4daced8328c4 | |
parent | ac6f72205ac87371d1c9c994b75b96f23321be6c [diff] |
[dart2js] Add async lowering transformation to kernel lowering transformer. The JS expansion of an async/await function is a complex state machine. In many cases 'async' functions either do not use 'await' or have very simple 'await' logic which is easily captured by [Future]. By making this transformation we avoid substantial over head from the state machine. This implements the simplest case of a function with no awaits which translates to a Future.value() call. Tested on cm_shell with the following results: Before: Compiled 243,799,156 characters Dart to 155,116,598 characters After: Compiled 243,799,156 characters Dart to 154,781,536 characters Reduced output size by ~0.2%. Later iterations of this will reduce JS size by ~0.7%. Change-Id: I918f820ed2a8b27081dad0de9f922b595113d21f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/238461 Reviewed-by: Joshua Litt <joshualitt@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Nate Biggs <natebiggs@google.com>
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