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Replace the vfasl writer (which was in C) with a new implementation (in Scheme). The main result is that the vfasl writer can be used in cross-build mode. Racket uses the vfasl format for its boot images, because they can load faster --- cutting the Chez Scheme plus boot files startup time in half, which saves about 40msec on a typical machine. That's not enough to matter for something like DrRacket, but it can matter for small Racket scripts. Formerly, cross builds disabled vfasl generation. A vfasl file is roughly an image of code and data as it will appear in memory, and a relatively fast linking step makes the image work in a running process. The old implementation was in C because it reused GC structures and code, treating fasl creation as copying objects into a vfasl image instead of a new generation. The new implementation is more like a fasl reader, loading objects into a vfasl image instead of the live heap. The two implementations are about the same amount of code and both involve a certain amount of repeated implementation (i.e., imitating a collection or fasl load), but the Scheme implementation is more flexible and works for cross compilation. |
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Racket is a general-purpose programming language and an ecosystem for language-oriented programming.
This repository holds the source code for the core of Racket plus some related packages. The rest of the Racket distribution source code is in other repositories, mostly under the Racket GitHub organization.
Quick Start
Pre-built versions of Racket for a variety of operating systems and architectures, as well as convenient source distributions are available at
https://download.racket-lang.org
Racket comes with extensive documentation, including several tutorials. You can read all of this documentation, as well as documentation for third-party packages at
Building from Source
For information on building Racket from this repository, see the Build Guide.
Contributing
Contribute to Racket by submitting a pull request, joining the development mailing list, or visiting the IRC or Slack channels.
By making a contribution, you are agreeing that your contribution is licensed under the LGPLv3, Apache 2.0, and MIT licenses. Those licenses are available in this repository in the files racket/src/LICENSE-LGPL.txt, racket/src/LICENSE-APACHE.txt, and racket/src/LICENSE-MIT.txt.
See the Racket Build Guide for more guidance on contributing.
The Friendly Environment Policy contains guidelines on expected behavior within the Racket community.
License
Racket is free software; see LICENSE for more details.