291051e02d
ComputeElementAddress takes a base untagged address, an index, an index scale, and an offset and returns base + (index * scale) + offset as an untagged address. This removes the last conversions between untagged and unboxed integers for untagged GC-movable pointers. The only remaining conversions are the following cases, which all involve non-GC-movable pointers: 1. Calls to the FFI resolver (on IA32 only). 2. Returning nullptr when a pointer to memory is expected in exceptional returns from FFI callbacks. 3. Converting user-provided integers to FFI pointer objects and back. In addition, we no longer add the data field to materializations of typed data views, but instead recompute the data field in DeferredObject::Fill(). This removes the last source of unsafe untagged pointers that may have arbitrary lifetimes in the flow graph. Thus, we can now verify in the FlowGraphChecker that there are no GC-triggering instructions between the creation of an untagged GC-movable pointer and its use (including the use itself). To do this, this CL adds a predicate MayCreateUnsafeUntaggedPointer to definitions, which by default returns true for kUntagged results, false otherwise, and should only be overwritten in cases where the result can be proven to not be a untagged GC-movable pointer. TEST=vm/dart/regress_54710_il_test vm/cc/AllocationSinking_NoViewDataMaterialization Fixes: https://github.com/dart-lang/sdk/issues/54710 Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm64c-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-appjit-linux-debug-x64-try,vm-asan-linux-release-x64-try,vm-checked-mac-release-arm64-try,vm-eager-optimization-linux-release-ia32-try,vm-eager-optimization-linux-release-x64-try,vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64c-try,vm-ffi-qemu-linux-release-arm-try,vm-ffi-qemu-linux-release-riscv64-try,vm-fuchsia-release-x64-try,vm-linux-debug-ia32-try,vm-linux-debug-x64c-try,vm-mac-debug-arm64-try,vm-mac-debug-x64-try,vm-msan-linux-release-x64-try,vm-reload-linux-debug-x64-try,vm-reload-rollback-linux-debug-x64-try,vm-ubsan-linux-release-x64-try,vm-win-release-ia32-try Change-Id: Ie172a8bd0330a728a4f151478664a530f8d9b38a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/354862 Commit-Queue: Tess Strickland <sstrickl@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com> |
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benchmarks | ||
build | ||
docs | ||
pkg | ||
runtime | ||
samples | ||
sdk | ||
tests | ||
third_party | ||
tools | ||
utils | ||
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AUTHORS | ||
BUILD.gn | ||
CHANGELOG.md | ||
codereview.settings | ||
CONTRIBUTING.md | ||
DEPS | ||
LICENSE | ||
OWNERS | ||
PATENT_GRANT | ||
PRESUBMIT.py | ||
README.dart-sdk | ||
README.md | ||
sdk.code-workspace | ||
sdk_args.gni | ||
SECURITY.md | ||
WATCHLISTS |
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.