[ddc] Use prototype trick for better chrome performance After emitting a library, creates a dummy function for each library and sets the library object as the `.prototype` of the dummy function. Reverses the performance degradation seen after adding one too many members to the `dart:_runtime` library in: https://golem.corp.goog/PerformanceChanges?repository=dart&revision=116131 According to sra@ this serves as a signal to V8 that the members of the library should get optimized for fast lookup. These golem runs show performance improvements that support this. dartdevc performance improvements: https://golem.corp.goog/Comparison?repository=dart#targetA%3Ddartdevc%3BmachineTypeA%3Dlinux-x64%3BrevisionA%3D116273%3BpatchA%3Dnshahan--ddc--WIP-library-as-prototype-optimization-1%3BtargetB%3Ddartdevc%3BmachineTypeB%3Dlinux-x64%3BrevisionB%3D116238%3BpatchB%3DNone dartdevc-canary performance improvements: https://golem.corp.goog/Comparison?repository=dart#targetA%3Ddartdevc-canary%3BmachineTypeA%3Dlinux-x64%3BrevisionA%3D116273%3BpatchA%3Dnshahan--ddc--WIP-library-as-prototype-optimization-1%3BtargetB%3Ddartdevc-canary%3BmachineTypeB%3Dlinux-x64%3BrevisionB%3D116238%3BpatchB%3DNone Change-Id: Ifee464e393609c30eff4ea7c19da511134eccdcf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/427822 Reviewed-by: Nate Biggs <natebiggs@google.com> Commit-Queue: Nicholas Shahan <nshahan@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.