b3fbb59d60
In the old scheme, sync* generators would have an entry and a
body. The entry contained typed checks and the body had injected code
to call a 'factory' helper method to construct the _SyncStarIterable.
It was necessary to pass the element type to the body to be passed to
the factory.
int foo(T a, T b) sync* {yield f(a); yield f(b);}
is compiled to something like
foo(a, b) {
T._as(a); T._as(b);
return foo$body(a, b, type$.int);
}
foo$body(a, b, R) {
return _syncStarFactory(function(){BODY}, R);
}
When type checks were disabled (`-O3`), it was often possible to
generate a single function by merging these as there were no checks.
The new scheme keeps the entry and body separate, and constructs the
_SyncStarIterable in the entry:
foo(a, b) {
T._as(a); T._as(b);
return _syncStarFactory(foo$body(a, b), type$.int);
}
foo$body(a, b) {
return function(){BODY};
}
This keeps the typed Dart 'level' distinct from the untyped JavaScript
level.
The new scheme is a bit more verbose but has the advantage that the
call to `_syncStarFactory` can be inlined and optimized.
Change-Id: I13802d9c9eefd9323841670d059b75a81569d6cb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/296140
Reviewed-by: Mayank Patke <fishythefish@google.com>
Commit-Queue: Stephen Adams <sra@google.com>
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| .dart_tool | ||
| .github | ||
| benchmarks | ||
| build | ||
| docs | ||
| pkg | ||
| runtime | ||
| samples | ||
| sdk | ||
| tests | ||
| third_party | ||
| tools | ||
| utils | ||
| .clang-format | ||
| .gitattributes | ||
| .gitconfig | ||
| .gitignore | ||
| .gn | ||
| .mailmap | ||
| .style.yapf | ||
| .vpython | ||
| AUTHORS | ||
| BUILD.gn | ||
| 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:
-
Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.
-
Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.
-
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:
-
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).
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.