| commit | ddcd028cdee2cd7223ffddbb1aa6ad9f8080fe2e | [log] [tgz] |
|---|---|---|
| author | Martin Kustermann <kustermann@google.com> | Fri Feb 04 14:19:22 2022 +0000 |
| committer | Commit Bot <commit-bot@chromium.org> | Fri Feb 04 14:19:22 2022 +0000 |
| tree | 7e1302f70338b269fc14c33610b925cad0fef581 | |
| parent | 860f7c532d9ca7b48e73314786aaf1e01f98dacb [diff] |
[vm] Avoid expensive runtime function type checks in Future implementation The `_FutureListener.callback` field is used for multiple purposes (possibly to save memory by avoiding additional fields) so it cannot have a specific function type. This causes the `Function?` typed `_FutureListener.callback` field to be casted to proper function types such as `T Function(S)`. => Those runtime type checks are very expensive. To avoid introducing more fields we use an `unsafeCast<T>()` for those casts, since the implementation guarantees they are going to suceed. Issue https://github.com/dart-lang/sdk/issues/48225 TEST=ci Change-Id: I6f0cc87600462c8ca5baceeb511ce8a06c61237e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/230240 Reviewed-by: Nicholas Shahan <nshahan@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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