Paul Berry
3eb697c0af
An `await` expression or `yield` statement suspends the current function and allows other code in the same isolate to execute. In the case of nested functions, an `await` or `yield` in the inner function can allow the outer function to continue executing. That means that if the inner function promotes a local variable belonging to the outer function, then it isn't sound to carry that promotion past an `await` or `yield`. This change fixes the unsoundness by adding a flow analysis method `suspension`, which the shared type analysis logic uses to tell flow analysis that an `await` or `yield` has been found. The `suspension` method un-does the promotions of any variables that might be written to while the inner function is suspended. Fixes https://github.com/dart-lang/sdk/issues/62889. Change-Id: I77eaf997159819a7c50f44b67174d2aa6a6a6964 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/499382 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Bob Nystrom <rnystrom@google.com>
Dart
An approachable, portable, and productive language for high-quality apps on any platform
Dart is:
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Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
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Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
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Productive: Make changes iteratively: use hot reload to see the result instantly in your running app. Diagnose app issues using DevTools.
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
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Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
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Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
License & patents
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Using Dart
Visit dart.dev to learn more about the language, tools, and to find codelabs.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
Our API reference documentation is published at api.dart.dev, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).
Building Dart
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
There are more documents in our repo at docs.
Contributing to Dart
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.
Roadmap
Future plans for Dart are included in the combined Dart and Flutter roadmap on the Flutter wiki.