| commit | b75b2651f25ef02a5ea65dcf38b9afff3264c302 | [log] [tgz] |
|---|---|---|
| author | Alexander Markov <alexmarkov@google.com> | Wed Jul 16 11:05:01 2025 -0700 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Wed Jul 16 11:05:01 2025 -0700 |
| tree | ec6c907dfb51d4bace846e75a19ebd99d5209edc | |
| parent | 4e0e1975a6e5d96349bcd3ae09862bfb7b024108 [diff] |
[vm,corelib] Change static type of _Hash*Base._data to match runtime type VM uses _List<dynamic> for _HashVMBase._data, _HashVMImmutableBase._data and _uninitializedData at run time. Core library declares _data as List<Object?> and sometimes sets it to List<Object?>. This discrepancy between runtime type and static type sometimes causes performance regressions, because speculative exactness guard checks if runtime type arguments are exactly the same as type arguments of a static type, and deoptimization is triggered if they don't match. Since https://dart-review.googlesource.com/c/sdk/+/440064, VM evaluates type arguments of _HashVMBase._data and _HashVMImmutableBase._data as <dynamic> at compile time, so exactness guard against _data fails more often, which considerably affects performance in JIT mode. This change aligns runtime and static types of _data, making sure exactness guard against _data is always successful. TEST=ci, golem Change-Id: Ia842b57a372305001b5210ca59206992611c5fa7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/440681 Reviewed-by: Ryan Macnak <rmacnak@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.
There are more documents in our repo at docs.
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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.