Google Git
Sign in
dart / sdk / da758538d3c3fb9aa484b6e271ad98681f814326
commitda758538d3c3fb9aa484b6e271ad98681f814326[log] [tgz]
authorAske Simon Christensen <askesc@google.com>Fri Aug 18 10:19:22 2023 +0000
committerCommit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com>Fri Aug 18 10:19:22 2023 +0000
tree263fccbc149f3fdcf9180e1c3169f5dd587c134c
parent851e696270a25a66e210fe974f6500ea123a8fd8 [diff]
[dart2wasm] Make the index field in `_HashFieldBase` nullable

This is to allow `_HashFieldBase` to be used for immutable maps and
sets (which initialize their index lazily) without using an intrinsics
hack to allow a non-nullable field to be `null`.

This change is necessary for the upcoming optimization that will
use non-nullable Wasm types for non-nullable Dart fields.

Even though this code is shared with the VM, the change doesn't affect
VM performance in practice, since the VM compiler is able to infer
that the field is always non-null. Benchmark runs see no measurable
performance difference.

Change-Id: I3ba2f78044f965473a0ab10ddf864c78e7095634
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/321400
Commit-Queue: Aske Simon Christensen <askesc@google.com>
Reviewed-by: Jess Lally <jessicalally@google.com>
4 files changed
tree: 263fccbc149f3fdcf9180e1c3169f5dd587c134c
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .style.yapf
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. OWNERS
  30. PATENT_GRANT
  31. PRESUBMIT.py
  32. README.dart-sdk
  33. README.md
  34. sdk.code-workspace
  35. sdk_args.gni
  36. SECURITY.md
  37. WATCHLISTS
README.md

Dart

A client-optimized language for fast apps on any platform

Dart is:

  • Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.

  • Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.

  • Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web.

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 platforms illustration

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 on our wiki.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.