Jens Johansen
08faf7bddb
In 3c83032c60
(https://dart-review.googlesource.com/c/sdk/+/195517)
a change inadvertently made it in that changed readAnnotationList from
always returning a constant empty list when the size was 0, to only
returning an (almost) constant list if the size was 0 and a non-default
setting was enabled.
In practise that meant that for normal runs we went from returning
a constant list when the size was 0 to returning a new empty list,
and the benchmarking system said
AstFromBinaryLazy (Intel Xeon): +33.2%
AstFromBinaryLazyP90 (Intel Core i5): +87.2%
AstFromBinaryLazyP90 (Intel Xeon): +117%
(i.e. generally much slower).
This CL restore the status quo and my local benchmarks says:
AstFromBinaryLazy(RunTimeRaw): -22.98% +/- 3.91%
AstFromBinaryLazyP50(RunTimeRaw): -6.20% +/- 5.03%
AstFromBinaryLazyP90(RunTimeRaw): -54.25% +/- 3.78%
Change-Id: Ia198cbbb0b2739f49a085435d98efb04740fa593
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/198280
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: 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.