[dart2wasm] Optimize JS<->Dart string/byte data transfer more V8 has very limited support for inlining calls to Wasm functions into JS. For the string/byte copy implementation it failed to inline functions due to needing to do type conversions of parameters in JS wrappers (e.g. to check that value is `anyref`). => We change wasm signatures to requires `WasmExternRef` => We do the type cast inside the wasm => This makes V8 inline the accessors This results in roughly 3-10x faster JS<->Wasm data transfer: WasmDataTransfer.ToBrowserString.10: -60% WasmDataTransfer.ToBrowserBytes.10: -72% WasmDataTransfer.FromBrowserString.1KB: -70% WasmDataTransfer.ToBrowserBytes.1KB: -74% WasmDataTransfer.FromBrowserString.1MB: -70% WasmDataTransfer.ToBrowserString.1MB: -86% WasmDataTransfer.ToBrowserBytes.1MB: -91% (There's still plenty of room for improvement, especially on the V8 side). Change-Id: I1e0c3843a5c5e2bcd10a616b71f49ea3338ae280 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/380700 Reviewed-by: Ömer Ağacan <omersa@google.com> Commit-Queue: Martin Kustermann <kustermann@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.