Johnni Winther
8467186ca0
This CL completes the migration of the first wave of interdependent libraries in package:kernel, including ast.dart. In order to ensure non-nullability on AST properties, the Transformer has been split in 2 variants: Transformer which doesn't support removal of nodes and RemovingTransformer which supports removal where allowed by the context using 'removal sentinels'. Start reviewing Transformer and RemovingTransformer in visitors.dart since many of the changes are caused by the changes here. Included in the migration are the mixin_deduplication.dart and unreachable_code_elimination.dart since these needed porting to the RemovingTransformer which was aided by opting in the libraries which only depended on ast.dart. TEST=existing Change-Id: I9e63b985bd24896c25edd4ee51e37770187bcc17 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/184786 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@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.