History

Vincent Ambo fea7f90a7f fix(tvix/eval): thread Display & PartialEq through to thunk values If a thunk is already evaluated, there are cases where due to the memoisation implementation something might observe a value wrapped in a thunk. In these cases, the implementation of `Display` and `PartialEq` must delegate to the underlying value. Note that there are a handful of other cases like these which we need to cover. It is a little tricky to write integration tests for these directly, especially as some of the open-upvalue optimisations coming down the pipe will reduce the number of observable thunks. One test that covers a part of this behaviour is currently disabled (needs some more machinery), but it's being brought back in the next commits. Change-Id: Iaa8cd338c12236af844bbc99d8cec2205f0d0095 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6370 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI		2022-09-07 19:08:56 +00:00
..
benches	test(tvix/eval): Add attr merge benchmarks	2022-09-03 06:56:02 +00:00
docs	docs(tvix/eval): start a document on known optimisation potential	2022-09-06 07:29:25 +00:00
src	fix(tvix/eval): thread Display & PartialEq through to thunk values	2022-09-07 19:08:56 +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	test(tvix/eval): Add attr merge benchmarks	2022-09-03 06:56:02 +00:00
Cargo.toml	chore(tvix/eval): add release-with-debug cargo profile	2022-09-07 15:25:59 +00:00
default.nix	fix(tvix/eval): don't rebuild drv upon changes in cargo target dir	2022-09-04 21:02:50 +00:00
README.md	docs(tvix/eval): add a note on how to run Nix tests	2022-09-03 00:47:58 +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:

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.