Clone this repo:
  1. 4045d8c Update by Asger Feldthaus · 4 months ago master
  2. 8e2b2c0 Bump kernel's pubspec version to 0.2.0 by Asger Feldthaus · 4 months ago
  3. 423fb2f Upgrade analyzer version to 0.29.0 by Asger Feldthaus · 4 months ago
  4. e6e61f5 Fix some issues after introducing NamedType. by Asger Feldthaus · 4 months ago
  5. 0defa95 Store named parameters in sorted lists instead of using maps. by Asger Feldthaus · 4 months ago


This has moved into the Dart SDK repository.

This repository is not kept up-to-date.

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

Getting Kernel

Checkout the repository and run pub get:

git clone
cd kernel
pub get

Command-Line Tool

Run bin/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 for a description of the binary format. For now, the textual format is very ad-hoc and cannot be parsed back in.


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 from binary files is not yet implemented. In order to compile a whole program, currently everything must be compiled from source at once.