Ömer Sinan Ağacan
78ce85a7fe
In dart2wasm, when a comparison like `x == "hello"` is true, we can't assume that the class of `x` is the same as the class of `"hello"`: - If `x` is received from JS, it will be `JSStringImpl`. - If it's a substring of a `TwoByteString`, it will be `TwoByteString`. - Otherwise it will be `OneByteString`. Update `Target` with the new method ``` bool get canInferStringClassAfterEqualityComparison => true; ``` to allow TFA to *not* infer classes of string values after comparisons. Override the method to return `false` in dart2wasm's `Target` implementation. Fixes #59901. Tested: web/wasm/issue_59901_test Change-Id: I1a6c8deaf27c54240dd4e821dbd8160914502ad7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/404562 Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Ömer Ağacan <omersa@google.com>
Dart Kernel
Dart Kernel is a small high-level language derived from Dart. It is designed for use as an intermediate format for whole-program analysis and transformations, and to be consumed by codegen and execution backends.
The kernel language has an in-memory representation in Dart and can be serialized as binary or text.
Both the kernel language and its implementations are unstable and are under development.
This package contains the Dart part of the implementation and contains:
- A transformable IR for the kernel language
- Serialization of kernel code
Note: The APIs in this package are in an early state; developers should be careful about depending on this package. In particular, there is no semver contract for release versions of this package. Please depend directly on individual versions.
See ast.dart for the in-memory IR, or binary.md for a description of the binary format. For now, the textual format is very ad-hoc and cannot be parsed back in.