| commit | c8869151bd226aa938760508c0da9b732c0770b3 | [log] [tgz] |
|---|---|---|
| author | Stephen Adams <sra@google.com> | Thu Aug 28 13:40:10 2025 -0700 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Thu Aug 28 13:40:10 2025 -0700 |
| tree | 82915d98829e9fd3fbeb2a820df3254b249e0efb | |
| parent | 48bd8d5c2d4143d25c5d868eb6510d2ddccc4528 [diff] |
[dart2js] Remove obsolete code from DCE Remove an obsolete optimization: an instruction that has no users and has the only effect of checking the the receiver is non-null, can be removed when followed by another instruction with the same null-checking effect. With sound null safety, this rarely occurs. Most cases where this would have fired are now explicit null checks that are not dead because the second instruction is data-dependent of the check instruction. There is similar code in instruction selection to omit null checks, so we can rely on that. The remaining cases are with back-to-back JS-fragments. This can be managed by adding a null check. Added a test case for an added null check. Issue: #60327 Change-Id: Iace58bd944839166bc677d85bba2fe8d5c75da4c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/446483 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Stephen Adams <sra@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.
There are more documents in our repo at docs.
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.
Future plans for Dart are included in the combined Dart and Flutter roadmap on the Flutter wiki.