Jens Johansen
ca877c964f
The code for reading dill files via dart has a "debugPath" list that is continously added and removed to in order to be able to debug what went wrong if something goes wrong (e.g. if the dill file is invalid or the reading code is wrong etc). This CL wraps the updates of this list in assert so that we don't pay for what we don't use in the general case. In a debug setting we can get the functionality back via --checked. On a benchmark of 10 runs, the time it takes to read vm_outline.dill 100 times after a 2 second warmup changes by -2.77% +/- 1.21%. Bug: Change-Id: I643b8dd778972621046fe76b536fd95e9bb66d1c Reviewed-on: https://dart-review.googlesource.com/18820 Reviewed-by: Peter von der Ahé <ahe@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@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 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.