| commit | 949eb447a47b49f6db18c7920a0de837b274757b | [log] [tgz] |
|---|---|---|
| author | Ryan Macnak <rmacnak@google.com> | Mon Oct 28 22:41:39 2024 +0000 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Mon Oct 28 22:41:39 2024 +0000 |
| tree | d7c27b1a6a051896f05d14e0dccbee3db3eb8f72 | |
| parent | 1e69ae8c2982d4b1342f5d93a73f2a579b1042b4 [diff] |
[vm, gc] Add write-write fence after initializing object headers, or defer marking new-space objects in an active TLAB. On architectures with a weak memory model, there is the possibility that the concurrent marker can see the publishing store of a new object before it sees the initializing store of that object's header. On an M1, the barrier to prevent reordering these stores is fairly cheap, so we emit this barrier on Mac/iOS ARM64. Otherwise, this barrier is very expensive (or at least expensive for some hardware within the ABI), so instead we avoid the race by deferring marking of objects inside an active TLAB. Disable TSAN instrumentation on the marker setting the mark bit, as TSAN does not understand fences. TEST=ooo arm64 machines Bug: https://github.com/dart-lang/sdk/issues/56845 Change-Id: I0676661a7cf941fdc6b451e516d890c26826bb3b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/389265 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Siva Annamalai <asiva@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.