6672353e0f
Previously, the default type arguments for closure functions were instantiated in the same way as other types of functions, where the instantiator and function type arguments of the call were used. However, the defaults for closure functions should be instantiated with the instantiator and parent function type arguments stored within the closure itself. Since the instantiation of the default type arguments only depends on the instantiator and parent function type arguments, which are shared between partial instantiations of the same generic closure, the VM performs this instantiation once at closure creation and caches it in the closure object, so it can be retrieved when the default type arguments are needed and copied to new partial instantiations of the same closure without need for recalculation. As a side effect, this should speed up dynamic invocation of generic closures, since the invoke field dispatcher that implements them previously performed this instantiation when needed on every invocation, but now it just retrieves the cached version instead. TEST=language/closure/type_arguments vm/dart/regress_54426 Fixes: https://github.com/dart-lang/sdk/issues/54426 Change-Id: I9baad807befa0323f3c5b66196b9664e4d78af0a Cq-Include-Trybots: luci.dart.try:vm-aot-linux-release-x64-try,vm-reload-linux-release-x64-try,vm-reload-rollback-linux-release-x64-try,vm-tsan-linux-release-x64-try,vm-aot-tsan-linux-release-x64-try,vm-aot-msan-linux-release-x64-try,vm-msan-linux-release-x64-try,vm-aot-linux-release-arm64-try,vm-aot-dwarf-linux-product-x64-try,vm-aot-mac-product-arm64-try,vm-aot-obfuscate-linux-release-x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/344700 Reviewed-by: Daco Harkes <dacoharkes@google.com> |
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Dart
An approachable, portable, and productive language for high-quality apps on any platform
Dart is:
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Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
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Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
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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:
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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.
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Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
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.