Chloe Stefantsova
442836bce4
Some subtype tests are crashing due to infinite recursion. It is a known issue. An example of such test is FutureOr<T> against FutureOr<S> where T and S are type variables declared as T extends FutureOr<T> and S extends FutureOr<S>. In some cases it's possible to fail early instead of crashing, for exmaple, by checking Future-branch of the left-hand side first before checking the type argumennt of FutureOr which would lead to the infinite recursion. This CL does that, allowing some more type checks to pass instead of crashing. Change-Id: I075aa65522510db1a97ac2a8de7278a3ce3f400c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/227820 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Chloe Stefantsova <cstefantsova@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.