Peter von der Ahé
47f09a619e
Before, the part-URI was serialized as a file-URI and conflated with source location information. The part-URI is the URI in the following declaration in a Dart source file: part "URI"; This is different from what we normally call a file-URI. A file URI is used to point to the source location of the part declaration, not the URI in the part declaration. Furthermore, the field was serialized using writeUriReference which only works for URIs that are in the uriToSource map on a Component. Although this might seem like a safe optimization, it doesn't work if the uriToSource map is omitted or if a part declaration refers to a missing file. Finally, due to the confusing use of fileUri, LibraryPart was mistakenly implementing FileUriNode and annotations were stripped of source locations if the source for the part were omitted from uriToSource. The partUri field is now an unresolved string that can be resolved against either the parent library's import- or file-URI to obtain either version as needed. Change-Id: I255cb4eeaf89928292ab32a2f6be9ead6cc8cee1 Reviewed-on: https://dart-review.googlesource.com/49500 Commit-Queue: Peter von der Ahé <ahe@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 as a frontend for codegen and execution backends.
The kernel language has in-memory representations in Dart and C++, 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
- A frontend based on the analyzer
- Serialization of kernel code
Note: The APIs in this package are in an early state; developers should be careful about depending on this package.
Getting Kernel
Checkout the repository and run pub get:
git clone https://github.com/dart-lang/kernel
cd kernel
pub get
Command-Line Tool
Run tool/dartk.dart from the command-line to convert between .dart files
and the serialized binary and textual formats.
dartk expects the .dill extension for files in the binary format.
The textual format has no preferred extension right now.
Example commands:
dartk foo.dart # print text IR for foo.dart
dartk foo.dart -ofoo.dill # write binary IR for foo.dart to foo.dill
dartk foo.dill # print text IR for binary file foo.dill
Pass the --link or -l flag to link all transitive dependencies into one file:
dartk myapp.dart -ppackages -l -omyapp.dill # Bundle everything.
dartk myapp.dill # Print it back out in a (very, very long) textual format.
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.
Testing
If you plan to make changes to kernel, get a checkout of the Dartk SDK and run:
tool/regenerate_dill_files.dart --sdk <path to SDK checkout>
pub run test
Linking
Linking from binary files is not yet implemented. In order to compile a whole program, currently everything must be compiled from source at once.