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2022-08-25 r/4479 feat(tvix/eval): implement list concatenationVincent Ambo1-0/+7
Change-Id: Icdf715d116371a9f139bdf95266410bf967bef25 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6144 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-08-25 r/4478 feat(tvix/eval): implement binary comparison operatorsVincent Ambo1-7/+36
This is accomplished by simply delegating to the Rust implementations of (Partial)Ord and (Partial)Eq, which are implemented for Value and underlying wrapper types to behave like they do in Nix. To ease the implementation overhead, a new comparison operator macro has been added to the VM module. Incomparable types will raise a new error variant when a comparison is attempted, containing both supplied types. This mimics the information carried in the error thrown by C++ Nix. Change-Id: Ia19634d69119d40722f3ca672387bc3a80096998 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6143 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-08-25 r/4477 refactor(tvix/vm): simplify implementation of OpEqualVincent Ambo1-8/+1
This can now fully delegate to PartialEq of Value Change-Id: Iaa9f4ec9b8830d516d72f83a93ab2df9a6e5697c Reviewed-on: https://cl.tvl.fyi/c/depot/+/6142 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-08-25 r/4475 feat(tvix/eval): implement attrset update (`//`) operatorVincent Ambo1-0/+9
The underlying implementation does a few tricks based on which pair of attrset representations is encountered. Particularly the effect of short-circuiting the empty cases might be relevant in nixpkgs/NixOS, due to the use of lib.optionalAttrs. Change-Id: I22b978b1c69af12926489a71087c6a6219c012f3 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6140 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-08-25 r/4472 feat(tvix/eval): implement string concatenationVincent Ambo1-1/+13
Change-Id: If61066e59232b2bad42b5cb5f0f2d9b9c416be8b Reviewed-on: https://cl.tvl.fyi/c/depot/+/6137 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-08-25 r/4471 refactor(tvix/vm): use a macro to handle binary arithmetic operatorsVincent Ambo1-49/+32
Instead of constructing another runtime value representing the pair on which to perform arithmetic, implement the same logic in the shape of a macro. This is designed to be compatible with operators like `+` that work both as an arithmetic operator AND as an operator on another pair of types. Change-Id: I1c83649ead6117f811f1fb45482d0cadf811125e Reviewed-on: https://cl.tvl.fyi/c/depot/+/6136 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-08-24 r/4457 feat(tvix/value): introduce string representation with &'static strVincent Ambo1-3/+3
For cases where the strings are statically known (such as the oft-occuring name/value), this can be a useful optimisation. It's also much more convenient in tests. Change-Id: Ie462b684805bd4986ea5e85ca4bff663bc2d3c3c Reviewed-on: https://cl.tvl.fyi/c/depot/+/6111 Tested-by: BuildkiteCI Reviewed-by: eta <tvl@eta.st>
2022-08-24 r/4454 refactor(tvix/value): encapsulate attrset logic within value::attrsVincent Ambo1-189/+3
The internal optimisations of the set representation were previously leaking into the VM, which is highly undesirable. Keeping it encapsulated allows us to do additional optimisations within value::attrs without being concerned about its use in the VM. Change-Id: I7e7020bb0983b9d355d3db747b049b2faa60131f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6108 Reviewed-by: eta <tvl@eta.st> Tested-by: BuildkiteCI
2022-08-14 r/4443 refactor(tvix/rm): introduce helper for AttrSet Entry APIVincent Ambo1-20/+27
There are multiple points where an insertion needs to be done into an attribute set, but copying the key or checking for presence before insertion should be avoided As that is a little bit noisy, it's been factored out into a helper function in this commit. Change-Id: Ibcb054ebeb25a1236c06c812f47c8e74180d4fc9 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6107 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-14 r/4442 feat(tvix/vm): implement first nested attribute set constructionVincent Ambo1-39/+130
This can construct non-overlapping nested attribute sets (i.e. `{ a.b = 1; b.c = 2; }`, but not `{ a.b = 1; a.c = 2; }`). In order to do the latter, it's necessary to gain the ability to manipulate the in-progress attribute set construction. There's multiple different options for this ... Change-Id: If1a762a720b175e8eb4216cbf96a7434d22640fb Reviewed-on: https://cl.tvl.fyi/c/depot/+/6106 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4440 fix(tvix/eval): Fail on duplicate attribute set keysVincent Ambo1-1/+5
Change-Id: I57373ca76d0e25a5d08a8dfce9d5949099326fc0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6104 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4439 feat(tvix/eval): construct internal attribute path representationVincent Ambo1-0/+18
This is required for constructing nested attribute sets at runtime. There'll be quite a lot of optimisation potential with this solution eventually, if it should turn out to be a bottleneck. This introduces a conceptual change, in that the `Value` enum is now an enum representing "all runtime values" instead of "all Nix language types". This makes sense in general, as this type will also contain Chunk representations etc. which are not exposed to users. Change-Id: Ic5f72b2a0965b146c6a451efad34c6a81ca1aad8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6103 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-08-13 r/4438 feat(tvix/vm): implement construction of optimised KV attrsetsVincent Ambo1-0/+77
For name/value pairs (which occur extremely often in Nix and make up a significant chunk of the runtime cost of evaluating nixpkgs) we substitute an optimised representation. For now this will only be used if the name/value pair keys were specified as literal identifiers or strings (i.e. if chunks are encountered as keys they are not forced and a normal attribute set backed by a map will be constructed). Change-Id: Ic79746c323e627528bd58b1a6024ee8d0aff7858 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6102 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-08-13 r/4434 feat(tvix): implement string interpolationVincent Ambo1-0/+15
This adds a new instruction which assembles an interpolated string from a specified number of fragments, which are already going to be located on the stack in the right position. This will raise a type error if any of the fragments do not evaluate to a string. Change-Id: I5756248fa3e9fcc3d063c14db40b332f7e20a588 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6098 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4430 feat(tvix/vm): implement list constructionVincent Ambo1-1/+17
Change-Id: Iec2b4910800ab29daae6d71b58a8acd14ccb1cc1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6094 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi> Autosubmit: tazjin <tazjin@tvl.su>
2022-08-13 r/4427 feat(tvix/eval): implement trivial attribute set literalsVincent Ambo1-1/+18
Implements attribute set literals without nesting. Technically this already supports dynamic key fragments (evaluating to strings), though the only way to create these (interpolation) is not yet implemented. However, creating simple attribute sets like `{ }`, or `{ a = 15; }` or `{ a = 10 * 2; }` works. Recursive attribute sets are not yet implemented as we do not have any kind of scope access yet anyways. This is implemented using a new instruction that creates an attribute set with a given number of elements by popping key/value pairs off the stack. Change-Id: I0f9aac7a131a112d3f66b131297686b38aaeddf2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6091 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-13 r/4423 feat(tvix/eval): add Value variants for strings & attrsetsVincent Ambo1-2/+2
Change-Id: Idebf663ab7fde3955aae50f635320f7eb6c353e8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6087 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4417 refactor(tvix/eval): move NumberPair struct definition to vm moduleVincent Ambo1-1/+7
This isn't relevant to the value type itself. Change-Id: I678bc92a8a530b1081ed498bf3ff7925217bcc01 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6081 Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4416 feat(tvix/compiler): incompletely handle true/false/null literalsVincent Ambo1-3/+3
These are a bit tricky to implement because Nix technically treats them as identifiers, and only if the identifier is not explicitly overridden within the scope does it yield the expected literal values. Note that weirdness even occurs with scopedImport. Change-Id: Ie55723405ccfcc25da37c5a08fa3332f37cf9ae5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6080 Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4415 feat(tvix/eval): implement boolean inversion operatorVincent Ambo1-1/+5
Change-Id: Icb1d449fdee4d67b5f1eefdbc01baa1584ea0a67 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6079 Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4414 feat(tvix/eval): implement equality operatorVincent Ambo1-4/+18
Change-Id: I9dd54aed72cd7e67593dc76f5a046ebbda40c26f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6078 Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4411 feat(tvix/eval): implement unary negation operatorVincent Ambo1-0/+12
Change-Id: I5d012cc073e55d79d7b34b88283aab3164864293 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6075 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4410 feat(tvix/eval): implement simple arithmetic binary operationsVincent Ambo1-1/+50
Implements simple arithmetic operations (+, -, *, /). There is some scaffolding included to pop and coerce pairs of numbers, as the Nix language will let arithmetic operators apply to arbitrary pairs of number types (always resulting in floats if the types are mixed). Change-Id: I5f62c363bdea8baa6ef812cc64c5406759d257cf Reviewed-on: https://cl.tvl.fyi/c/depot/+/6074 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2022-08-12 r/4407 feat(tvix/eval): add initial stack-based VMVincent Ambo1-0/+55
This can't do anything other than compute a single literal, for now Change-Id: Ia28f9da51c906b590a198e77a4ca5d45a871106b Reviewed-on: https://cl.tvl.fyi/c/depot/+/6071 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>