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2022-09-21 r/4950 fix(tvix/eval): compare versions with an extra empty componentsterni2-2/+17
This is necessary because builtins.compareVersions compares versions in a subtly not-quite-but-still-lexicographical way: `pre` for example can have an effect if it is post-fixed: `2.3 < 2.3pre`. This is a violation of the rule that in a lexicographical ordering, the longer string is considered greater if they are otherwise equal. builtins.compareVersion is comparing lexicographically though, if you do the following transformation beforehand: 2.3 --split--> [ "2" "3" ] --append--> [ "2" "3" "" ] 2.3pre --split--> [ "2" "3" "pre" ] --append--> [ "2" "3" "pre" "" ] Comparing the transformed version is then done lexicographically: 2.3 < 2.3.0pre since [ "2" "3" "" ] < [ "2" "3" "0" "pre" ] Here, the `pre` rule never comes into effect because no comparison on it happens, instead we use the longer string rule of a lexicographical comparison. In the C++ codebase, the reason for this behavior is that the iterator-esque construct they use always yields the empty string before it exposes it has been fully consumed. This is probably intentional to support the postfixed `pre` which is, for example, used by NixOS versions (e.g. unstable post 22.05 is 22.11-pre). We replicate this behavior using the `Chain` iterator in `VersionPartsIter::new_for_cmp`. Change-Id: I021c69aa27b0b7deb949dffe50ed18b6de3a7b1f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6720 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-21 r/4949 fix(tvix/eval): implement C++ Nix version part comparison algorithmsterni1-1/+37
This is based on the [relevant code] in C++ Nix. Our version has more branches because the C++ one only checks if it is less than or not, so can save handling a few cases. We on the other hand, can avoid calling the algorithm twice. It'd be nice to implement proptests for this in the future and to make sure that this weird little algorithm doesn't violate the Ord laws. [relevant code]: https://github.com/NixOS/nix/blob/cd35bbbeef72375873e396b9ffed14a4638693a8/src/libstore/names.cc#L81-L94 Change-Id: I46642e6da5eac7c0883cdce860622cdba04cd12b Reviewed-on: https://cl.tvl.fyi/c/depot/+/6719 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2022-09-21 r/4947 fix(tvix/eval/versions): preserve the Number string exactlysterni2-6/+5
This is relevant for builtins.splitVersion: nix-repl> builtins.splitVersion "unstable-2022-02-21" [ "unstable" "2022" "02" "21" ] Change-Id: I0a0add178d95d5a82e112b41ed5f3ca5a19608f8 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6710 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-21 r/4946 fix(tvix/eval/versions): dash is a divider, not underscoresterni1-1/+1
https: //github.com/NixOS/nix/blob/cd35bbbeef72375873e396b9ffed14a4638693a8/src/libstore/names.cc#L63 Change-Id: I1d5aba6060d11778f3b79089f4b27ef8849e4d37 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6709 Reviewed-by: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-21 r/4945 feat(tvix/eval): implement builtins.splitVersionsterni1-1/+16
This was fairly easy, thanks to the work already done by Thomas Frank. However, the implementation is suboptimal because we parse number parts only to convert them back to strings afterwards. I've chosen to tackle this problem in the future, since having an (inefficient) implementation of splitVersion will be helpful for debugging the slight discrepancies between C++ Nix and Tvix in the case of compareVersions. Change-Id: Id6ed8eeb77663ff650c8c53ea952875b1fb7ea84 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6688 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-20 r/4943 refactor(tvix/eval): add VM::call_value helper methodVincent Ambo1-4/+2
This makes it possible to call a callable value (builtin or closure/lambda) directly, without unwrapping it first. This is needed for pretty much all higher-order functions to work correctly. This is mostly equivalent to the previous code in coerce_to_string for calling `__toString`, except it expects the argument(s) to already be placed on the stack. Note that the span for the `NotCallable` error is not currently guaranteed to make any sense, will experiment with this. Change-Id: I821224368d438a28900858b343defc1817e46a0a Reviewed-on: https://cl.tvl.fyi/c/depot/+/6717 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-20 r/4941 feat(tvix/eval): implement builtins.mapVincent Ambo1-1/+17
As we already have a VM passed to the builtins, we can simply execute the provided closure/lambda in it for each value. The primary annoyance with this is that we have to clone the upvalues for each element, but we can try making this cheaper in the future (it's also a general problem in the VM itself). Change-Id: I5bcf56d58c509c0eb081e7cf52f6093216451ce4 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6714 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-20 r/4936 fix(tvix/eval): make sure to deref thunk in type predicate builtinssterni1-18/+28
Previously we only matched the outer constructor after forcing which would mean that we would always return `false` if the inspected value was a thunk, regardless what value would be present inside. Change-Id: I361ea6e855e23ef8e5b59098a50b9cd59253803f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6692 Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-20 r/4933 fix(tvix/eval): make sure to force before selecting in catAttrssterni1-5/+6
Previously, this would almost always crash because list items are thunked more often nowadays and selecting from a thunk would fail. Also we no longer pop from args, accessing it by index should avoid an unnecessary clone here. Change-Id: I4410c4c2e28cc255a2c7cf2a5322db3d2c556a0e Reviewed-on: https://cl.tvl.fyi/c/depot/+/6693 Reviewed-by: grfn <grfn@gws.fyi> Autosubmit: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-20 r/4932 refactor(tvix/eval/builtins): avoid unnecessary poppingsterni1-8/+4
Change-Id: I631b442e19e5c05455d705291c11037eae9ed9e0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6694 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-09-20 r/4931 refactor(tvix/eval): don't unnecessarily force in toStringsterni1-1/+2
Change-Id: I2bcc720ce7b6aa67ea5f145b1f2381a3ae833ac5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6691 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-19 r/4928 feat(tvix/eval): Support builtins.getAttrWilliam Carroll1-0/+11
Support looking-up values from attrsets by their keys. Change-Id: Ib37a472a511dab145f99ebc849879b3494e8e89f Reviewed-on: https://cl.tvl.fyi/c/depot/+/6554 Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: sterni <sternenseemann@systemli.org> Autosubmit: wpcarro <wpcarro@gmail.com> Tested-by: BuildkiteCI
2022-09-19 r/4927 feat(tvix/eval): Support builtins.hasAttrWilliam Carroll1-0/+6
See unit tests for examples :) Change-Id: Ieec51d780a7762cc455ca03a9dc1648a0711924a Reviewed-on: https://cl.tvl.fyi/c/depot/+/6553 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-19 r/4919 fix(tvix/eval): fix flipped sign in builtins.compareVersionssterni1-2/+2
Change-Id: I42fc0dc633fbd525eaa35689a41ec3717f4352a2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6690 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-19 r/4918 refactor(tvix/eval): handle forcing in Builtin::applysterni1-58/+46
Instead of arity, we pass a array reference to Builtin::new that describes how many arguments there are and which of them need to be forced, eliminating the need to force manually. Note that this change doesn't fix some of the instances where the the Builtin doesn't consider that the value could be a Thunk. Change-Id: Iadb58bb79886c30dc6b09dcf0ffad8abf28036a1 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6662 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-19 r/4917 feat(tvix/eval): Support builtins.tailWilliam Carroll1-0/+10
TL;DR: - support `builtins.tail` - define `ErrorKind::TailEmptyList` and canonical error code - support basic unit tests Unsure whether or not the error should be a dedicated `ErrorKind`... Change-Id: Iae90fda1bb21ce7bdb1aaa2aeb2b8c1e6dcb0f05 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6545 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-19 r/4916 feat(tvix/eval): Support builtins.substringWilliam Carroll1-0/+29
Nix's `builtins.substring`: - doesn't accept negative indexes for `beg` or `end`. Compare the error messages for: - `builtins.substring -3 5 "testing"` - `builtins.substring 3 -5 "testing"` - `builtins.substring -3 -5 "testing"` - returns an empty string when `beg >= end` - allows `end` to exceed the length of the input string Change-Id: I83af7a099d81b6d537ebe5029d946c7031cb7113 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6555 Reviewed-by: wpcarro <wpcarro@gmail.com> Autosubmit: wpcarro <wpcarro@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-18 r/4914 refactor(tvix/eval): Simplify forcing in builtinsGriffin Smith1-97/+57
Refactor the `force!` macro to a method on `Value` which returns a smart-pointer-esque type, which simplifies the callsite and eliminates rightward drift, especially for high-arity builtins. Change-Id: I97a7837580accfb4bbd03b24f2acdbd38645efa5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6656 Autosubmit: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-17 r/4885 feat(tvix_eval): Support builtins.compareVersionsThoFrank2-0/+131
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/4882 feat(tvix/eval): Support builtins.elemAtWilliam Carroll1-0/+14
(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 lintssterni1-1/+1
Change-Id: I88482453a62955515a0dcc0b243351b2bbac5236 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6618 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-09-15 r/4869 feat(tvix/eval): Support builtins.bitXorWilliam Carroll1-0/+7
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 Carroll1-0/+7
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 Carroll1-0/+7
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 Carroll1-0/+12
:) 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()sterni1-0/+26
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 Carroll1-0/+12
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/4862 feat(tvix/eval): Support builtins.headWilliam Carroll1-0/+8
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/4857 feat(tvix/eval): implement correct toString behaviorsterni1-4/+4
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
2022-09-13 r/4848 fix(tvix/eval): force value in builtins.typeOfsterni1-2/+4
This prevents Nix programs to observe the "internal" type of thunks. Possibly .type_of() is also an area of the runtime where we should panic if "internal" would ever be returned. Change-Id: I9f358044c48ad64896fb6a1b1a42f00a29efac00 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6539 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: grfn <grfn@gws.fyi> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2022-09-10 r/4786 fix(tvix/eval): fix doc comment syntax where applicableVincent Ambo1-0/+3
As pointed out by grfn on cl/6091 Change-Id: I28308577b7cf99dffb4a4fd3cc8783eb9ab4d0d6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6460 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-09 r/4782 fix(tvix/eval): force value passed to builtins.toStringVincent Ambo1-3/+25
This introduces a macro to do the forcing, but this solution isn't very nice and also does not work in all cases yet. Change-Id: Icd18862ec47edb82c0efc3af5835a6cb6126f629 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6456 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-08 r/4750 fix(tvix/eval): force argument of builtins.lengthVincent Ambo1-1/+4
Change-Id: Iaf94dfc7cb058f5c1c311066d92e01512e09cf71 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6417 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-08 r/4745 refactor(tvix/eval): add macros for generating Value castersVincent Ambo1-4/+4
The casting methods of `Value` are pretty verbose, and actually incorrect before this commit as they did not account for inner thunk values. To address this, we first attempt to make them correct by introducing a standard macro to generate them and traverse the inner thunk(s) if necessary. This is likely to be a performance hit as it will now involve more cloning of values. We can do multiple things to alleviate this, but should do some measurements first. Change-Id: If315d6e2afe7b69db727df535bc6cbfb89a691aa Reviewed-on: https://cl.tvl.fyi/c/depot/+/6412 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-08 r/4744 refactor(tvix/eval): pass a VM reference to builtinsVincent Ambo1-19/+19
This makes it possible for builtins to force values on their own, without the VM having to apply a strictness mask to the arguments first. Change-Id: Ib49a94e56ca2a8d515c39647381ab55a727766e3 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6411 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-08 r/4741 feat(tvix/eval): ensure all errors always carry a spanVincent Ambo1-10/+10
Previously error spans were optional because the information about code spans was not available at runtime. Now that this information has been added, the error type will always carry a span. This change is very invasive all throughout the codebase. This is due to the fact that many functions that are called *by* the VM expected to return `EvalResult`, but this no longer works as the span information is not available to those functions - only to the VM itself. To work around this the majority of these functions have been changed to return `Result<T, ErrorKind>` instead and an accompanying macro in the VM constructs the "real" error. Note that this implementatino currently has a bug where errors occuring within thunks will yield the location at which the thunk was forced, not the location at which the error occured within the code. This will be fixed soon, but the commit is large enough as is. Change-Id: Ib1ecb81a4d09d464a95ea7ea9e589f3bd08d5202 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6408 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
2022-09-07 r/4740 feat(tvix/eval): Support builtins.lengthWilliam Carroll1-0/+3
Get the length of a list Change-Id: I41d91e96d833269541a1b3c23b7cc879f96d1e5a Reviewed-on: https://cl.tvl.fyi/c/depot/+/6407 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-07 r/4739 feat(tvix/eval): Support builtins.{mul,div}William Carroll1-0/+10
Multiplication and division :) Change-Id: I79e76f3b55b7e9b8d1eb09b3d9741140b4d75742 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6406 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-07 r/4738 feat(tvix/eval): Support builtins.{add,sub}William Carroll1-0/+12
First pass at supporting `builtins` for tvix. The following tests appear to be WAI: ```shell $ cd tvix/eval $ cargo build $ cargo test ``` Change-Id: I27cce23d503b17a886d1109e285e8b4be4264977 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6405 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-03 r/4608 fix(tvix/eval): address all current clippy lintsVincent Ambo1-5/+4
Change-Id: I758fc4f3b9078de7ca6228a75a4351c3e085c4cf Reviewed-on: https://cl.tvl.fyi/c/depot/+/6272 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-09-03 r/4605 refactor(tvix/eval): introduce Closure struct in Value typeVincent Ambo1-1/+1
This struct will carry the upvalue machinery in addition to the lambda itself. For now, all lambdas are wrapped in closures (though technically analysis of the environment can later remove innermost Closure wrapper, but this optimisation may not be worth it). Change-Id: If2b68549ec1ea4ab838fdc47a2181c694ac937f2 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6269 Reviewed-by: grfn <grfn@gws.fyi> Tested-by: BuildkiteCI
2022-09-02 r/4596 feat(tvix/eval): implement builtins.catAttrsVincent Ambo1-1/+14
Change-Id: Idf92ac82438fbfcf7b2f6e058830e4744637d8c6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6262 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-02 r/4595 feat(tvix/eval): implement builtins.typeOfVincent Ambo1-0/+3
Change-Id: Ibc5039b444fadf6f9e5cd9132fcd825a871cee06 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6261 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-02 r/4594 feat(tvix/eval): implement type-checking builtinsVincent Ambo1-0/+28
Change-Id: I70d7d837beaaed7e10cdc7577d96130f9e1b6d39 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6260 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-02 r/4593 feat(tvix/eval): implement 'throw' and 'abort' builtinsVincent Ambo1-1/+14
These do essentially the same, but return different error variants as upstream Nix considers `throw` to be (sometimes) catchable. Change-Id: I1a9ea84567d46fb37287dbf3f3f67052f9382cca Reviewed-on: https://cl.tvl.fyi/c/depot/+/6259 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-02 r/4592 refactor(tvix/eval): implement clearer mechanism for globalsVincent Ambo1-15/+52
The set of things that can leak out of `builtins` into the global scope is statically known (it is what Nix 2.3 leaks there, essentially). This is a mild change over the previous mechanism, where instead at the point where the `builtins` set is constructed we "lift" the globals out of there (if they exist). This way users will still eventually be able to add additional builtins, HOWEVER they will not be able to leak them into the global scope. Note that upstream Nix technically leaks _all_ builtins into the global scope using the `__*` prefix, but we are trying to avoid this in Tvix if it is not required in nixpkgs. Change-Id: Ie9dec2ce33740134f3b2464eba3749f421dd5953 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6258 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-02 r/4590 feat(tvix/eval): add builtins.isNullVincent Ambo1-0/+5
Change-Id: Iae251d41b4ac6b77df56078a954ec3e33b7f9ccf Reviewed-on: https://cl.tvl.fyi/c/depot/+/6256 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
2022-09-02 r/4588 feat(tvix/eval): introduce mechanism for defining builtinsVincent Ambo1-0/+26
Adds a new builtins module in which builtins can be constructed. The functions in this module should return a correctly structured value to be passed to the compiler's `globals`. This is wired up all the way to the compiler with an example `toString` builtin, available as a global. Note that this does not yet actually behave like the real toString, which has some differences from `Display`. Change-Id: Ibb5f6fbe6207782fdf2434435567fc1bd80039a5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/6254 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>
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