7cfbfc6a25
This CL replaces `late Finalizable` variables with the original and a nullable non-late variable. Every assignment is done first to the late variable, and the immediately to the nullable non-late shadow variable. The reachability fences are then inserted only for the nullable non-late shadow variable. The advantage of this is that the semantics are fully valid and none of the further compiler pipeline has to know about late Finalizables. (1) We remove the special casing in the VM. (2) The TFA logic with finalizables is no longer blocked. The downside of this approach is that we use more memory, we need two fields at runtime, one storing a null and the other storing a sentinel on initiazation. Moreover, we get some extra store instructions. TEST=pkg/vm/testcases/transformations/ffi/finalizable_late.dart TEST=pkg/vm/testcases/transformations/ffi/finalizable_late_2.dart TEST=tests/language/vm/regress_49005_test.dart Closes: https://github.com/dart-lang/sdk/issues/51511 Change-Id: Ifedd3387a368233a2d01e1bcaa9f5e3eceb76856 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/286782 Commit-Queue: Daco Harkes <dacoharkes@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> |
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benchmarks | ||
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pkg | ||
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sdk | ||
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tools | ||
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CHANGELOG.md | ||
codereview.settings | ||
CONTRIBUTING.md | ||
DEPS | ||
LICENSE | ||
OWNERS | ||
PATENT_GRANT | ||
PRESUBMIT.py | ||
README.dart-sdk | ||
README.md | ||
sdk_args.gni | ||
SECURITY.md | ||
WATCHLISTS |
Dart
A client-optimized language for fast apps on any platform
Dart is:
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Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.
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Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.
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Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web.
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.