4258a59789
Passing handles in FFI calls has significant overhead due to how each handle requires a runtime entry to allocate in the handle scope. This change removes that runtime entry by relying on the register allocator to allocate all handle arguments on the stack, so that we don't need to allocate them separately. To pass the stack handles to the native call we then pass a pointer to the stack slot as the native argument. Testing: - We already have comprehensive tests for correctness in the form of the FFI tests. These make calls with various combinations of Handle and non-handle arguments. - Correct GC behaviour is likewise covered in `vmspecific_handle_test.dart` which makes calls with handles arguments and triggers GC in-flight. In case we do not correctly pass the handles on the stack, the GC will trash them during the call. TEST=Existing. Bug: https://github.com/dart-lang/sdk/issues/47624 Change-Id: Ic837bad5484daaa5534b7c2e8707ac2c5dfa480f Cq-Include-Trybots: luci.dart.try:vm-kernel-gcc-linux-try,vm-kernel-linux-debug-simriscv64-try,vm-kernel-nnbd-mac-release-arm64-try,vm-kernel-precomp-android-release-arm64c-try,vm-kernel-precomp-android-release-arm_x64-try,vm-kernel-precomp-dwarf-linux-product-x64-try,vm-kernel-precomp-linux-debug-simarm_x64-try,vm-kernel-precomp-linux-debug-simriscv64-try,vm-precomp-ffi-qemu-linux-release-arm-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243320 Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Clement Skau <cskau@google.com> |
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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.