mirror of
https://github.com/dart-lang/sdk
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71 lines
2.1 KiB
Markdown
71 lines
2.1 KiB
Markdown
Dart Kernel
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===========
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**Dart Kernel** is a small high-level language derived from Dart.
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It is designed for use as an intermediate format for whole-program analysis
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and transformations, and as a frontend for codegen and execution backends.
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The kernel language has in-memory representations in Dart and C++, and
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can be serialized as binary or text.
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Both the kernel language and its implementations are unstable and are under development.
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This package contains the Dart part of the implementation and contains:
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- A transformable IR for the kernel language
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- A frontend based on the analyzer
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- Serialization of kernel code
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_Note:_ The APIs in this package are in an early state; developers should be
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careful about depending on this package.
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Getting Kernel
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------------
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Checkout the repository and run pub get:
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```bash
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git clone https://github.com/dart-lang/kernel
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cd kernel
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pub get
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```
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Command-Line Tool
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-----------------
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Run `tool/dartk.dart` from the command-line to convert between .dart files
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and the serialized binary and textual formats.
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`dartk` expects the `.dill` extension for files in the binary format.
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The textual format has no preferred extension right now.
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Example commands:
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```bash
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dartk foo.dart # print text IR for foo.dart
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dartk foo.dart -ofoo.dill # write binary IR for foo.dart to foo.dill
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dartk foo.dill # print text IR for binary file foo.dill
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```
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Pass the `--link` or `-l` flag to link all transitive dependencies into one file:
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```bash
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dartk myapp.dart -ppackages -l -omyapp.dill # Bundle everything.
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dartk myapp.dill # Print it back out in a (very, very long) textual format.
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```
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See [ast.dart](lib/ast.dart) for the in-memory IR, or [binary.md](binary.md) for
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a description of the binary format. For now, the textual format is very ad-hoc
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and cannot be parsed back in.
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Testing
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-------
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If you plan to make changes to kernel, get a checkout of the Dartk SDK and run:
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```bash
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tool/regenerate_dill_files.dart --sdk <path to SDK checkout>
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pub run test
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```
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Linking
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-------------------------
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Linking from binary files is not yet implemented. In order to compile a whole
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program, currently everything must be compiled from source at once.
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