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2022-09-18 r/4912 docs(tvix/eval): Document OpAttrsGriffin Smith1-0/+4
Document the OpAttrs op, paying special attention to the (perhaps confusing) behavior of taking the number of *pairs*, not the number of *values*, which will be popped off the stack into the resulting attr set. Change-Id: I64df0290308ecae7a5c7e14ead37091d32701507 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6654 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4911 refactor(tvix/eval): use Clap for arg+env parsingGriffin Smith8-28/+167
Refactor the environment variable and argument parsing for the tvix repl to use Clap instead of doing things ad-hoc, and thread through options obtained from environment variables via explicit arguments rather than obtaining them from the environment as they're needed. This makes adding more flags more sustainable, and also makes the binary fully self-documenting, including supported env vars, via `--help`. Change-Id: Ib1f6a0cd20056e8c9196760ff755fa5729667760 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6653 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4910 fix(tvix/eval): Force thunks during equality comparisonGriffin Smith3-5/+20
Thunks might be encountered deep in equality comparison (eg nested inside a list or attr-set), at which point we need to force them in order to compare them for equality (or else we panic when trying to get at their value). Fixes: b/192 Change-Id: I912151085f8298f30d5214c7965251c9266443f2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6652 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4909 chore(tvix/eval): Pass in VM to nix_eqGriffin Smith5-20/+55
Pass in, but ignore, a mutable reference to the VM to the `nix_eq` functions, in preparation for using that VM to force thunks during comparison. Change-Id: I565435d8dfb33768f930fdb5a6b0fb1365d7e161 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6651 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4908 refactor(tvix/eval): Don't (ab)use PartialEq for Nix equalityGriffin Smith11-118/+196
Using rust's PartialEq trait to implement Nix equality semantics is reasonably fraught with peril, both because the actual laws are different than what nix expects, and (more importantly) because certain things actually require extra context to compare for equality (for example, thunks need to be forced). This converts the manual PartialEq impl for Value (and all its descendants) to a *derived* PartialEq impl (which requires a lot of extra PartialEq derives on miscellanious other types within the codebase), and converts the previous nix-semantics equality comparison into a new `nix_eq` method. This returns an EvalResult, even though it can't currently return an error, to allow it to fail when eg forcing thunks (which it will do soon). Since the PartialEq impls for Value and NixAttrs are now quite boring, this converts the generated proptests for those into handwritten ones that cover `nix_eq` instead Change-Id: If3da7171f88c22eda5b7a60030d8b00c3b76f672 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6650 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4907 refactor(tvix/eval): clone the Arc<codemap::File> for the compilerVincent Ambo4-10/+11
This disconnects ownership of the `File` reference in a compiler from the calling scope, which is required for when we implement `import`. `import` will need to carry an `Rc<RefCell<CodeMap>>` (or maybe, in the future, Arc) to give us the ability to add new detected code files at runtime. Note that the choice of `Arc` over `Rc` here is not ours - it's the codemap crate's. Change-Id: I3aeca4ffc167acbd1701846a332d93550b56ba7d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6630 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-09-18 r/4906 test(tvix/eval): Add Eq-laws tests for NixAttrsGriffin Smith1-0/+11
As before, this limits the cases to a relatively small number because otherwise things get quite large. Change-Id: I5371dc56418fca52e1dd1d905b20868f647091ba Reviewed-on: https://cl.tvl.fyi/c/depot/+/6649 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4905 test(tvix/eval): Add tests for the Eq laws of ValueGriffin Smith2-0/+23
Only running 20 cases for now, since Value can get quite big if you let it run for a while. Change-Id: I09ef19da22c789c4869793836c98937c44595340 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6648 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4904 fix(tvix/value): Properly match on Path for PartialEqGriffin Smith1-0/+1
this was found by proptests! Change-Id: I16d6a6ece3b20cdddd6f78c94cc87befb1b651e6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6647 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4903 test(tvix/eval): Allow passing ProptestConfig to generated propsGriffin Smith1-15/+40
Add an optional config argument to the `<trait>_laws` macros, to allow configuring the generated tests with a ProptestConfig struct (to limit the number of cases run) Change-Id: I2143ddb72c6a870e8be4a9058135b6f9a703039e Reviewed-on: https://cl.tvl.fyi/c/depot/+/6646 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4902 test(tvix/eval): impl Arbitrary for ValueGriffin Smith4-0/+128
Impl Arbitrary for Value (and NixAttrs and NixList) in the same way we did for NixString. Value currently only generates non-"internal" values (no thunks, AttrNotFound, etc.) and can't generate functions (builtins or closures), because those'd require full generation of tvix bytecode, which is a bit more work than I'd like to do now - there's a `todo!` left in the code for a place where we could allow opting-in to internal values and functions later. Change-Id: I07a59e2b1d89cfaa912d4ecebd642caf4ddb040a Reviewed-on: https://cl.tvl.fyi/c/depot/+/6627 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4901 test(tvix/eval): Add proof-of-concept test for ChunkGriffin Smith4-4/+28
This is pretty boring at the moment, but mostly serves as a foot in the door in the direction of writing more tests Change-Id: Id88eb4ec7e53ebb2d5b5c254c8f45ff750238811 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6637 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-18 r/4898 fix(tvix/eval): Emit errors for invalid integersGriffin Smith2-2/+19
Invalid integers (eg integers that're too long) end up as error returns on the `.value()` returned from the literal in the AST - previously we'd unwrap this error, causing it to panic the compiler, but now we've got a nice error variant for it (which just unwraps the underlying std::num::ParseIntError). Change-Id: I50c3c5ba89407d86659e20d8991b9658415f39a0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6635 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-18 r/4897 chore(tvix/eval): bump rnix-parser to latest HEADVincent Ambo2-3/+3
This bumps rnix-parser to a commit that should be unaffected by the Nix >= 2.4 bug that prevents it from cloning repositories with filters. Change-Id: Ie01da95245ec6740fa889eb710819e512202f665 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6634 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-18 r/4896 docs(tvix/eval): note C++ implementation details for C++ Nixsterni1-0/+8
Just want to note those down somewhere before I forget them again, we can delete them later if we have it all figured out. Change-Id: Icafa2d8fc7ca39e38e9637b7eca6f2bbf487c2b8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6632 Autosubmit: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-17 r/4894 test(tvix/eval): Add proptests covering trait impls for StringGriffin Smith3-0/+153
Add a suite of proptests covering the laws of the handwritten stdlib trait impls (Eq, Ord, and Hash) for String, generated from a new set of macros for generating those tests which can be applied to other types. Change-Id: Ib3276c9e96fca497aece094e5612707d3dc77ccd Reviewed-on: https://cl.tvl.fyi/c/depot/+/6626 Autosubmit: grfn <grfn@gws.fyi> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-17 r/4893 test(tvix/eval): Test StringRepr::Smol as wellGriffin Smith1-1/+8
The From<String> impl for NixString only generates StringRepr::Heap strings, but we want to make sure we're testing StringRepr::Smol too Change-Id: I6d04b9cf12ef8462fe2788e0c6414b165f40311d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6629 Autosubmit: grfn <grfn@gws.fyi> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-17 r/4892 test(tvix/eval): impl Arbitrary for NixStringGriffin Smith1-0/+17
Change-Id: I3fe2d410c789429493a1278d571ca8fe74c2a69d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6625 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-17 r/4891 chore(tvix/eval): Add deps on proptest+test_strategyGriffin Smith2-2/+151
It's proptest time! Add deps on the proptest and test_strategy crates, gated behind a new (default-enabled) "arbitrary" feature flag so that they don't affect dependencies of things like tvixbolt that depend on tvix. These are going in dependencies, not dev-dependencies, so that we can impl Arbitrary for stuff outside of test modules (which will be important for integration suites which want to run proptests) Change-Id: I1613bd3ea9a835e22986ad4e59700e8736007963 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6624 Autosubmit: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-17 r/4890 refactor(tvix/eval): rename OpAttrsIsSet -> OpHasAttrVincent Ambo3-3/+3
This matches the name of the AST node from which it was compiled. Suggested by sterni in cl/6231 Change-Id: Ia51525158d2f47467c01fce2282005b1a8417a47 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6623 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: grfn <grfn@gws.fyi>
2022-09-17 r/4889 refactor(tvix/eval): clean up implementation of `compile_literal`Vincent Ambo1-10/+7
Suggested by sterni in cl/6231 Change-Id: I58bbc8a922d360ea79a4dacb76cf8aa1fad93757 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6622 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-17 r/4888 test(tvix/eval): add a test for lazy evaluation of with namespaceVincent Ambo2-0/+7
Suggested by grfn in cl/6222 Change-Id: I8413af6404786bd43e5cb462a307cc236c4fb9ae Reviewed-on: https://cl.tvl.fyi/c/depot/+/6621 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-17 r/4887 chore(tvix/eval): add simple .envrc / shell.nixsterni2-0/+19
Change-Id: I10a44b92391a8ac4d7ec5e4b878953c215f59908 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6620 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-17 r/4886 test(tvix/eval): Add the start of a nix oracle test suiteGriffin Smith4-30/+165
Add the start of a test suite that compares tvix eval results against nix, using the string repr of the value as the comparison. This shells out to a nix-instantiate binary, which is configurable as an environment variable, to eval - there's some extra machinery there to setup a new nix store as a tempdir to allow running this test inside the nix build for tvix-eval itself. Currently this has a macro that'll allow writing lots and lots of hardcoded tests, but going forward I'm also going to be looking into adding proptest-based generation of expressions to compare. Change-Id: I9f4895fab1e668ed2b7dfd6f92f8c80de1bbb16b Reviewed-on: https://cl.tvl.fyi/c/depot/+/6307 Autosubmit: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-17 r/4885 feat(tvix_eval): Support builtins.compareVersionsThoFrank4-0/+144
Added an Iterator over &str wich yields the VersionParts. Change-Id: I8043d423127446a173d01d290aab10de0c24a6fc Reviewed-on: https://cl.tvl.fyi/c/depot/+/6619 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-17 r/4884 refactor(tvix/eval): use new ToSpan trait wherever possibleVincent Ambo1-24/+16
... it would be nice if we could thread it through to the `Scope` stuff (declaring phantoms & locals). Change-Id: Id3b84e79032b8fbb12138b719e657565355fbc79 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6616 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-17 r/4883 feat(tvix/eval): introduce `ToSpan` trait in compiler moduleVincent Ambo2-18/+96
This trait can be used to convert most structures from rnix-parser into a codemap::Span. It uses a macro to implement the trait for the various expression types in the rnix AST, as Rust's silly semantic versioning restriction stops us from doing a blanket implementation. This will be used in the next commit to clean up the span handling in the compiler a bit. Change-Id: I0a437034e5fa203b5a49c6f25c45932a9f3b2bca Reviewed-on: https://cl.tvl.fyi/c/depot/+/6615 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-17 r/4882 feat(tvix/eval): Support builtins.elemAtWilliam Carroll4-2/+22
(Attempt to) index into a list. Change-Id: I3592e60a79e64d265e34100d4062041b0b410e00 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6551 Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: wpcarro <wpcarro@gmail.com> Tested-by: BuildkiteCI
2022-09-16 r/4881 refactor(tvix/eval): fix current clippy lintssterni2-9/+6
Change-Id: I88482453a62955515a0dcc0b243351b2bbac5236 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6618 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-09-16 r/4879 test(tvix/eval): add tests for legacy let syntaxVincent Ambo4-0/+15
Change-Id: I42d6240056c93cf90986ef3fec88b42f804b06ef Reviewed-on: https://cl.tvl.fyi/c/depot/+/6613 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4878 test(tvix/eval): add some tests for recursive attribute setsVincent Ambo4-0/+19
Change-Id: I6a4fbe6d5aa6d2ce223bf77330d6c0f512d4300d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6612 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4877 feat(tvix/eval): implement legacy let syntaxVincent Ambo2-4/+18
... and emit a warning if anyone decides to use. Change-Id: Iaa6fe9fa932340e6d0fa9f357155e78823702576 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6611 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-16 r/4876 feat(tvix/eval): implement recursive attribute setsVincent Ambo2-34/+77
Yep. This is kind of ugly right now. The idea is that the recursive_scope compilation function is used for recursive sets as well by emitting the keys. The rest of the logic is pretty much identical. There is quite a lot of code here that can be cleaned up (duplication between attrs and let, duplication inside of the recursive scope compilation function etc.), but I'd like to get it working first and then make it nice. Note that nested keys are *not* supported yet. Change-Id: I45c7cdd5f0e1d35fd94797093904740af3a97134 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6610 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4875 refactor(tvix/eval): introduce a type for tracking bindingsVincent Ambo1-24/+64
This type is used in the list temporarily populated by the *second* pass over all identifiers in a recursive scope. This first pass only serves to make all bindings known to the compiler, without populating their values yet. Having a type here is going to be useful once we implement `rec`, which needs to thread through slightly more information. Change-Id: Ie33e0f096c5fcb6c864c991255466748b6f0d1eb Reviewed-on: https://cl.tvl.fyi/c/depot/+/6609 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4874 refactor(tvix/eval): extract recursive scope logic into a helperVincent Ambo1-7/+14
This needs to be reused between let & `rec` attrs. Change-Id: I4a3bb90af4be32771b0f9e405c19370e105c0fef Reviewed-on: https://cl.tvl.fyi/c/depot/+/6608 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4873 refactor(tvix/eval): move compile_inherit_attrs to compiler::attrsVincent Ambo2-62/+62
Plain move, no other changes. Change-Id: Ic4f89709f5c2cbc03182a848af080c820e39a0fd Reviewed-on: https://cl.tvl.fyi/c/depot/+/6607 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4872 refactor(tvix/eval): explicitly construct attrs in phasesVincent Ambo2-32/+101
This makes the phases of attribute set construction that Nix has very explicit (inherits, static keys, dynamic keys). This change focuses on the split between dynamic/static keys by collecting all dynamic ones while compiling the static ones, and then phasing them in afterwards. It's possible we also need to do some additional splitting inside of the inherits. Change-Id: Icae782e2a5c106e3ce0831dda47ed81c923c0a42 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6530 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-16 r/4870 docs(tvix): Update components.mdFlorian Klink2-31/+63
This extends various ideas around the store and its slightly different internal model. Thanks to store composition, lazy substitution and more efficient transfer, we can also simplify some complicated logic while building. Change-Id: Ib3380af650fe06e114f54e8dc2df231f18af876b Reviewed-on: https://cl.tvl.fyi/c/depot/+/6585 Autosubmit: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-15 r/4869 feat(tvix/eval): Support builtins.bitXorWilliam Carroll3-0/+20
Bitwise "exclusive-or" on integers. Change-Id: I90a0a15afb3a58662d70e82ea14e48b877476e04 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6550 Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4868 feat(tvix/eval): Support builtins.bitOrWilliam Carroll3-0/+18
Bitwise `or` on integers. Change-Id: I45b0897331d1a9b6840f9d0feedcf10acc67fcec Reviewed-on: https://cl.tvl.fyi/c/depot/+/6549 Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4867 feat(tvix/eval): Support builtins.bitAndWilliam Carroll4-0/+19
Bitwise `and` on integers. Change-Id: I9f2a9182a057af26906683acd97a40dfabbdded8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6548 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4866 feat(tvix/eval): Support builtins.attrValuesWilliam Carroll3-0/+17
:) Change-Id: Idf170b506ed6fab035b1e6f61055fee02e5c9be8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6547 Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: wpcarro <wpcarro@gmail.com> Tested-by: BuildkiteCI
2022-09-15 r/4865 feat(tvix/eval): implement Value::coerce_to_path()sterni4-1/+48
This function is necessary for all builtins that expect some form of path as an argument. It is merely a wrapper around coerce_to_string that can shortcut if we already have a path. The absolute path check is done in the same way as in C++ Nix for compatibility, although it should probably be revised in the long term (think about Windows, for example). Since coercing to a path is not an operation possible in the language directly, this function can live in the builtins module as the only place it is required. Change-Id: I69ed5455c00d193fea88b8fa83e28907a761cab5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6574 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4864 feat(tvix/eval): Support builtins.attrNamesWilliam Carroll4-2/+36
Define `.len()` method on `NixAttrs` to preallocate the capacity of the result vector. Also anchor an errant comment to its context (I think). Change-Id: I268f15025d453d7b3ae1146558c80e51433dd2a8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6546 Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: sterni <sternenseemann@systemli.org> Autosubmit: wpcarro <wpcarro@gmail.com> Tested-by: BuildkiteCI
2022-09-15 r/4863 chore(tvix): add grfn & sterni to OWNERSVincent Ambo1-0/+2
Change-Id: Ieb7647a571332f49f896b5c4a86784d8ea31a5d8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6605 Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4862 feat(tvix/eval): Support builtins.headWilliam Carroll5-0/+27
TL;DR: - support `builtins.head` - define `ErrorKind::IndexOutOfBounds` and canonical error code - support basic unit tests Change-Id: I859107ffb4e220cba1be8c2ac41d1913dcca37ff Reviewed-on: https://cl.tvl.fyi/c/depot/+/6544 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4861 refactor(tvix/eval): don't move parts Vec in compile_str_partssterni1-7/+5
This allows us to get rid of the count local variable which was a bit confusing. Calling parts.len() multiple times is fine, since the length doesn't need to be computed. Change-Id: I4f626729ad1bf23a93cb701385c3f4b50c57456d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6584 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4860 fix(tvix/eval): coerce string interpolation parts to stringsterni3-36/+59
With this puzzle piece of string compilation in place, `compile_str` becomes less redundant, as every part now needs to be compiled the same. The thunking logic becomes a bit trickier, since we need to thunk even in the case of `count == 1` if the single part is interpolating. Splitting the inner (shared) code in a separate function turned out to be easier for making rustc content. Change-Id: I6a554ca599926ae5907d7acffce349c9616f568f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6582 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4859 fix(tvix/eval): thunk string interpolationsterni3-18/+40
If we have multiple string parts, we need to thunk assembling the string. If we have a single literal, it is strict (like all literals), but a single interpolation part may compile to a thunk, depending on how the expression inside is compiled – we can avoid forcing to early here compared to the previous behavior. Note that this CL retains the bug that `"${x}"` is erroneously translated to `x`, implying e.g. `"${12}" == 12`. The use of `parts.len()` is unproblematic, since normalized_parts() builds a `Vec` instead of returning an iterator. Change-Id: I3aecbfefef65cc627b1b8a65be27cbaeada3582b Reviewed-on: https://cl.tvl.fyi/c/depot/+/6580 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-15 r/4857 feat(tvix/eval): implement correct toString behaviorsterni6-14/+196
Implement C++ Nix's `EvalState::coerceToString` minus some of the Path / store handling. This is currently only used for `toString` which does all possible coercions, but we've already prepared the weaker coercion variant which is e.g. used for builtins that expect string arguments. `EvalState::coerceToPath` is still missing for builtins that need a path, but it'll be easy to build on top of this. Change-Id: I78d15576b18921791d04b6b1e964b951fdef22c6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6571 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
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