Jens Johansen
49e0a9b19e
Looking at only the amount of data used by interface types after loading a dill completely (lazy loading disabled or everything read): Loading the sdk: Saving ~3.3 MB. Loading a compile of a simple flutter app: Saving: ~11.6 MB. Loading a compile of dart2js: Saving: ~18.2 MB. Testing on a big internal app I see savings of 200+MB. In my tests it reduces the amount of interface types by a factor of between 7 and 12. Looking at the VMs reported memory, peak memory and heap usage, without lazy loading for the big internal app we're talking ~200 MB savings, with lazy loading (without loading anything) we're generally talking a ~10MB saving (process current an peak memory, but where the heaps total capacity was ~4 MB bigger). https://github.com/dart-lang/sdk/issues/50161 Change-Id: Ic6601e907fb3127694f54e0865fe7c5a7057d9f5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/266383 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Jens Johansen <jensj@google.com> Reviewed-by: Martin Kustermann <kustermann@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.