b530e496a5
This adds an initial working version of builtins.import which encapsulates the entire functionality of `import` within the builtin itself, without requiring any changes in the compiler or VM. The key insight that enables this is that we can simply return a Thunk from `import` that is constructed from the output of running the compiler and - ta-da! - no other component needs to know about it. A couple of notes: * builtins.import needs to capture variables like the SourceCode structure. This means it can not currently be constructed the same way as other builtins and has special handling, which leaks out to `eval.rs`. I have postponed dealing with that until we have this working a bit more. * the `globals` are not yet passed through * the error representation for the new variants is absolutely not done yet, we probably want to switch to something that supports cause-chaining now (like miette) * there is no mechanism for emitting warnings at runtime; we need to add that Change-Id: I3117a7ae3ff2432bf44f5ff05ad35f47faca31d5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6857 Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: wpcarro <wpcarro@gmail.com> Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi> |
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| benches | ||
| docs | ||
| proptest-regressions/value | ||
| src | ||
| tests | ||
| .envrc | ||
| .gitignore | ||
| .skip-subtree | ||
| Cargo.lock | ||
| Cargo.toml | ||
| default.nix | ||
| README.md | ||
| shell.nix | ||
Tvix Evaluator
This project implements an interpreter for the Nix programming language. You can experiment with an online version of the evaluator: tvixbolt.
The interpreter aims to be compatible with nixpkgs, on the
foundation of Nix 2.3.
Important note: The evaluator is not yet feature-complete, and while the core mechanisms (compiler, runtime, ...) have stabilised somewhat, a lot of components are still changing rapidly.
Please contact TVL with any questions you might have.
Building the evaluator
If you are in a full checkout of the TVL depot, you can simply run mg build in this directory (or mg build //tvix/eval from anywhere in
the repo).
Important note: We only use and test Nix builds of our software against Nix 2.3. There are a variety of bugs and subtle problems in newer Nix versions which we do not have the bandwidth to address, builds in newer Nix versions may or may not work.
The evaluator can also be built with standard Rust tooling (i.e.
cargo build).
If you would like to clone only the evaluator and build it directly with Rust tooling, you can do:
git clone https://code.tvl.fyi/depot.git:/tvix/eval.git tvix-eval
cd tvix-eval && cargo build
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:
cargo test --features nix_tests
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.