History

Vincent Ambo ca90c0f45a refactor(tvix/eval): handle scope poisoning & globals dynamically Previously, the tokens that could poison a scope (`true`, `false`, `null`) had individual fields in the scope to track whether or not they were poisoned. This commit sets up new machinery that instead tracks scope poisoning dynamically using a HashMap, and which makes it possible to introduce additional tokens to the top-level ("global") scope that are directly resolved by the compiler by passing a map of runtime values to be used. With this solution, the compiler now contains all machinery required for wiring up builtins resolution. The set of builtins to be exposed at runtime must, however, be constructed outside of the compiler and passed in. Everything is prepared for this, but it is not yet wired up (so the only existing builtins are the ones we already had before). Note that this technically opens up an optimisation potential when compiling selection operations, where the attribute set being selected from is `builtins`. The compiler could directly resolve the builtins and place the right values on the stack. Change-Id: Ia7dad3c2a98703e7ea0c6ace1a722d57cc70a65c Reviewed-on: https://cl.tvl.fyi/c/depot/+/6253 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>		2022-09-02 12:59:23 +00:00
..
benches	feat(tvix/eval): Add initial benchmarking infrastructure	2022-08-25 16:03:55 +00:00
docs	docs(tvix/eval): add an overview of all builtins in Nix	2022-09-02 12:59:23 +00:00
src	refactor(tvix/eval): handle scope poisoning & globals dynamically	2022-09-02 12:59:23 +00:00
.gitignore	feat(tvix/eval): check in generated project skeleton	2022-08-12 12:34:29 +00:00
.skip-subtree	feat(tvix/tests): check in Nix' language test suite	2022-08-24 21:25:41 +00:00
Cargo.lock	chore(tvix/eval): bump rnix-parser to latest master	2022-09-01 17:41:22 +00:00
Cargo.toml	chore(tvix/eval): bump rnix-parser to latest master	2022-09-01 17:41:22 +00:00
default.nix	test(tvix/eval): make sure all language tests also pass with C++ Nix	2022-08-26 20:46:03 +00:00
README.md	docs(tvix/eval): add README note on running the Nix test suite	2022-08-24 23:11:12 +00:00

README.md

Tvix Evaluator

This project implements an interpreter for the Nix programming language.

The interpreter aims to be compatible with nixpkgs, on the foundation of Nix 2.3.

Work on this project is extremely in-progress, and the state of the project in the public repository may not necessarily reflect the state of the private codebase, as we are slowly working on publishing it.

We expect this to have caught up in a handful of weeks (as of 2022-08-12).

Please contact TVL with any questions you might have.

Nix test suite

C++ Nix implements a language test suite in the form of Nix source code files, and their expected output. The coverage of this test suite is not complete, but we intend to be compatible with it.

We have ported the test suite to Tvix, but do not run it by default as we are not yet compatible with it.

You can run the test suite by enabling the nix_tests feature in Cargo.

rnix-parser

Tvix is written in memory of jD91mZM2, the author of rnix-parser who sadly passed away.

Tvix makes heavy use of rnix-parser in its bytecode compiler. The parser is now maintained by Nix community members.