Martin Kustermann
4eaacc3df9
In general any async function can return X or Future<X>. Though the future implementation has to do different things depending on which case we're in. It does so by using a `<obj> is Future<T>` test. This test is very expensive if many different classes flow into `<obj>`. Though most functions do not return `Future` objects from async functions. We can determine that statically by looking if any returned expression could be a future. If not, we can bypass the `is Future<T>` test entirely. Issue https://github.com/dart-lang/sdk/issues/48226 Issue https://github.com/dart-lang/sdk/issues/48235 TEST=pkg/front_end/testcases/general/async_function_returns_future_or.dart Change-Id: If655bdbdddc214dd7b12be9905b3c788252547d0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/230662 Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
Dart Kernel
Dart Kernel is a small high-level language derived from Dart. It is designed for use as an intermediate format for whole-program analysis and transformations, and to be consumed by codegen and execution backends.
The kernel language has an in-memory representation in Dart and can be serialized as binary or text.
Both the kernel language and its implementations are unstable and are under development.
This package contains the Dart part of the implementation and contains:
- A transformable IR for the kernel language
- Serialization of kernel code
Note: The APIs in this package are in an early state; developers should be careful about depending on this package. In particular, there is no semver contract for release versions of this package. Please depend directly on individual versions.
See ast.dart for the in-memory IR, or binary.md for a description of the binary format. For now, the textual format is very ad-hoc and cannot be parsed back in.