[dart2wasm/tfa] More accurate checks for empty types When testing for an empty type, TFA can take allocated classes into account even if type is not specialized. This check is quick and more precise. As a result, TFA can eliminate certain calls when their argument types don't have allocated subtypes. This is important for dart2wasm as it doesn't handle interface calls without any dispatch targets. TEST=co19/Language/Generics/scope_t05 Fixes https://github.com/dart-lang/sdk/issues/52873 Change-Id: Iad39e478df7882127f39164893455b68fdbf44ac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/356306 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
Dart is:
Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
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:
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.
Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
Dart is free and open source.
See LICENSE and PATENT_GRANT.
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).
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
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