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dart / sdk / 81f0959372fcc8938c34cab90a8b45ba90cf1ceb
commit81f0959372fcc8938c34cab90a8b45ba90cf1ceb[log] [tgz]
authorAlexander Markov <alexmarkov@google.com>Wed Dec 21 16:07:03 2022 +0000
committerCommit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com>Wed Dec 21 16:07:03 2022 +0000
tree5fca9885a98500cc1c542a2e0b387816af67a43c
parentae4ee87601486072064f22771024dac110c4a14e [diff]
[vm] Fix record instance layout with compressed pointers

After record shape representation changed in https://dart-review.googlesource.com/c/sdk/+/276201,
clang started to insert an extra alignment padding
between 'shape' and 'data' fields in record instances
in compressed pointers mode. This padding is not initialized
in the allocation stubs, but GC scans it as it falls between
'from' (shape) and 'to' (end of data). This change adjusts
layout of UntaggedRecord in compressed pointers mode to avoid
the implicit padding and GC visiting garbage.

TEST=Manual run of language/records/simple tests and
RecordCollections benchmark on x64c and simarm64c architectures.

Issue: https://github.com/dart-lang/sdk/issues/49719
Change-Id: I4b8a5b36c3ff757ccbbdb46c20d9ed8d12c53f96
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/276775
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
2 files changed
tree: 5fca9885a98500cc1c542a2e0b387816af67a43c
  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_args.gni
  35. SECURITY.md
  36. 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.